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https://en.wikipedia.org/wiki/Electric-field%20integral%20equation
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The electric-field integral equation is a relationship that allows the calculation of an electric field () generated by an electric current distribution ().
Derivation
When all quantities in the frequency domain are considered, a time-dependency that is suppressed throughout is assumed.
Beginning with the Maxwell equations relating the electric and magnetic field, and assuming a linear, homogeneous media with permeability and permittivity :
Following the third equation involving the divergence of
by vector calculus we can write any divergenceless vector as the curl of another vector, hence
where A is called the magnetic vector potential. Substituting this into the above we get
and any curl-free vector can be written as the gradient of a scalar, hence
where is the electric scalar potential. These relationships now allow us to write
where , which can be rewritten by vector identity as
As we have only specified the curl of , we are free to define the divergence, and choose the following:
which is called the Lorenz gauge condition. The previous expression for now reduces to
which is the vector Helmholtz equation. The solution of this equation for is
where is the three-dimensional homogeneous Green's function given by
We can now write what is called the electric field integral equation (EFIE), relating the electric field to the vector potential A
We can further represent the EFIE in the dyadic form as
where here is the dyadic homogeneous Green's Function gi
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https://en.wikipedia.org/wiki/Magnesium%20silicide
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Magnesium silicide, Mg2Si, is an inorganic compound consisting of magnesium and silicon. As-grown Mg2Si usually forms black crystals; they are semiconductors with n-type conductivity and have potential applications in thermoelectric generators.
Crystal structure
Mg2Si crystallizes in the antifluorite structure. In the face-centered cubic lattice Si centers occupy the corners and face-centered positions of the unit cell and Mg centers occupy eight tetrahedral sites in the interior of the unit cell. The coordination numbers of Si and Mg are eight and four, respectively.
Synthesis
It can be produced by heating silicon dioxide, SiO2, found in sand, with excess magnesium. The process first forms silicon metal and magnesium oxide, and, if an excess of SiO2 is used, then elemental silicon is formed:
2 Mg + SiO2 → 2 MgO + Si
If an excess of Mg is present, Mg2Si is formed from the reaction of the remaining magnesium with the silicon:
2 Mg + Si → Mg2Si
These reactions proceed exothermically, even explosively.
Reactions
Magnesium silicide can be viewed as consisting of Si4− ions. As such it is reactive toward acids. Thus, when magnesium silicide is treated with hydrochloric acid, silane (SiH4) and magnesium chloride are produced:
Mg2Si + 4 HCl → SiH4 + 2 MgCl2
Sulfuric acid can be used as well. These protonolysis reactions are typical of a Group 2 alkaline earth metal and Group 1 alkali metal silicides. The early development of silicon hydrides relied on t
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https://en.wikipedia.org/wiki/Democratic%20People%27s%20Union
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The Democratic People's Union (Bosnian: Demokratska narodna zajednica, DNZ) is a political party in Bosnia and Herzegovina. It was founded in 1993 and first led by Fikret Abdić.
In 2014 the Democratic People's Union saw a major split when large number of its members led by Elvira Abdić-Jelenović (Fikret's daughter) founded a new party, the Labour Party of Bosnia and Herzegovina. Due to this split, the DNZ now has only 2 out of 28 members of the Velika Kladuša Municipality Council, while the new Labour Party gained a large majority.
References
External links
Website of the political party
Bosniak political parties in Bosnia and Herzegovina
Velika Kladuša
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https://en.wikipedia.org/wiki/Leukemoid%20reaction
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The term leukemoid reaction describes an increased
white blood cell count (> 50,000 cells/μL), which is a physiological response to stress or infection (as opposed to a primary blood malignancy, such as leukemia). It often describes the presence of immature cells such as myeloblasts or red blood cells with nuclei in the peripheral blood.
It may be lymphoid or myeloid.
Causes
As noted above, a leukemoid reaction is typically a response to an underlying medical issue. Causes of leukemoid reactions include:
Severe hemorrhage (retroperitoneal hemorrhage)
Drugs
Use of sulfa drugs
Use of dapsone
Use of glucocorticoids
Use of G-CSF or related growth factors
All-trans retinoic acid (ATRA)
Ethylene glycol intoxication
Infections
Clostridium difficile
Tuberculosis
Pertussis
Infectious mononucleosis (lymphocyte predominant)
Visceral larva migrans (eosinophil predominant)
Asplenia
Diabetic ketoacidosis
Organ necrosis
Hepatic necrosis
Ischemic colitis
As a feature of trisomy 21 in infancy (incidence of ~10%)
As a paraneoplastic phenomenon (rare)
Diagnosis
Conventionally, a leukocytosis exceeding 50,000 WBC/mm3 with a significant increase in early neutrophil precursors is referred to as a leukemoid reaction. The peripheral blood smear may show myelocytes, metamyelocytes, promyelocytes, and rarely myeloblasts; however, there is a mixture of early mature neutrophil precursors, in contrast to the immature forms typically seen in acute leukemia. Serum leukocyte alkal
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https://en.wikipedia.org/wiki/Solid-state%20nuclear%20magnetic%20resonance
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Solid-state NMR (ssNMR) spectroscopy is a technique for characterizing atomic level structure in solid materials e.g. powders, single crystals and amorphous samples and tissues using nuclear magnetic resonance (NMR) spectroscopy. The anisotropic part of many spin interactions are present in solid-state NMR, unlike in solution-state NMR where rapid tumbling motion averages out many of the spin interactions. As a result, solid-state NMR spectra are characterised by larger linewidths than in solution state NMR, which can be utilized to give quantitative information on the molecular structure, conformation and dynamics of the material. Solid-state NMR is often combined with magic angle spinning to remove anisotropic interactions and improve the resolution as well as the sensitivity of the technique.
Nuclear spin interactions
The resonance frequency of a nuclear spin depends on the strength of the magnetic field at the nucleus, which can be modified by isotropic (e.g. chemical shift, isotropic J-coupling) and anisotropic interactions (e.g. chemical shift anisotropy, dipolar interactions). In a classical liquid-state NMR experiment, molecular tumbling coming from Brownian motion averages anisotropic interactions to zero and they are therefore not reflected in the NMR spectrum. However, in media with no or little mobility (e.g. crystalline powders, glasses, large membrane vesicles, molecular aggregates), anisotropic local fields or interactions have substantial influence on the beh
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https://en.wikipedia.org/wiki/Councilman%20body
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In pathology, a Councilman body, also known as a Councilman hyaline body or apoptotic body, is an eosinophilic globule of apoptotic hepatocyte cell fragments. Ultimately, the fragments are taken up by macrophages or adjacent parenchymal cells. They are found in the liver of individuals suffering from acute viral hepatitis, yellow fever, and other viral syndromes.
Associated conditions
Councilman bodies were first identified in yellow fever, which characteristically shows a midzonal hepatic necrosis on biopsy. Similar inclusions are observed in other viral hemorrhagic fevers and all of the viral hepatitides. Liver biopsy of acute viral hepatitis shows panlobular lymphocytic infiltrates with ballooning hepatocytes.
Eponym
Councilman bodies are named after American pathologist William Thomas Councilman (1854–1933), who discovered them.
See also
Ballooning degeneration
Feathery degeneration
Mallory body
References
Hepatology
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https://en.wikipedia.org/wiki/Boron%20trioxide
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Boron trioxide or diboron trioxide is the oxide of boron with the formula . It is a colorless transparent solid, almost always glassy (amorphous), which can be crystallized only with great difficulty. It is also called boric oxide or boria. It has many important industrial applications, chiefly in ceramics as a flux for glazes and enamels and in the production of glasses.
Structure
Boron trioxide has three known forms, one amorphous and two crystalline.
Amorphous form
The amorphous form (g-) is by far the most common. It is thought to be composed of boroxol rings which are six-membered rings composed of alternating 3-coordinate boron and 2-coordinate oxygen.
Because of the difficulty of building disordered models at the correct density with many boroxol rings, this view was initially controversial, but such models have recently been constructed and exhibit properties in excellent agreement with experiment. It is now recognized, from experimental and theoretical studies, that the fraction of boron atoms belonging to boroxol rings in glassy is somewhere between 0.73 and 0.83, with 0.75 = 3/4 corresponding to a 1:1 ratio between ring and non-ring units. The number of boroxol rings decays in the liquid state with increasing temperature.
Crystalline α form
The crystalline form (α-) is exclusively composed of BO3 triangles. It crystal structure was initially believed to be the enantiomorphic space groups P31(#144) and P32(#145), like γ-glycine; but was later revised to the e
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https://en.wikipedia.org/wiki/Photovoltaic%20effect
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The photovoltaic effect is the generation of voltage and electric current in a material upon exposure to light. It is a physical and chemical phenomenon.
The photovoltaic effect is closely related to the photoelectric effect. For both phenomena, light is absorbed, causing excitation of an electron or other charge carrier to a higher-energy state. The main distinction is that the term photoelectric effect is now usually used when the electron is ejected out of the material (usually into a vacuum) and photovoltaic effect used when the excited charge carrier is still contained within the material. In either case, an electric potential (or voltage) is produced by the separation of charges, and the light has to have a sufficient energy to overcome the potential barrier for excitation. The physical essence of the difference is usually that photoelectric emission separates the charges by ballistic conduction and photovoltaic emission separates them by diffusion, but some "hot carrier" photovoltaic devices concepts blur this distinction.
History
The first demonstration of the photovoltaic effect, by Edmond Becquerel in 1839, used an electrochemical cell. He explained his discovery in Comptes rendus de l'Académie des sciences, "the production of an electric current when two plates of platinum or gold immersed in an acid, neutral, or alkaline solution are exposed in an uneven way to solar radiation."
The first solar cell, consisting of a layer of selenium covered with a thin film o
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https://en.wikipedia.org/wiki/Raudna
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Raudna is a village in Viljandi Parish, Viljandi County, Estonia. It has a population of 25 (as of 4 January 2010).
References
Villages in Viljandi County
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https://en.wikipedia.org/wiki/Plant%20Proteome%20Database
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The Plant Proteome Database is a National Science Foundation-funded project to determine the biological function of each protein in plants. It includes data for two plants that are widely studied in molecular biology, Arabidopsis thaliana and maize (Zea mays). Initially the project was limited to plant plastids, under the name of the Plastid PDB, but was expanded and renamed Plant PDB in November 2007.
See also
Proteome
References
External links
Plant Proteome Database home page
Plant physiology
Government databases in the United States
Biological databases
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https://en.wikipedia.org/wiki/Nuclear%20matrix
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In biology, the nuclear matrix is the network of fibres found throughout the inside of a cell nucleus after a specific method of chemical extraction. According to some it is somewhat analogous to the cell cytoskeleton. In contrast to the cytoskeleton, however, the nuclear matrix has been proposed to be a dynamic structure. Along with the nuclear lamina, it supposedly aids in organizing the genetic information within the cell.
The exact function of this structure is still disputed, and its very existence has been called into question. Evidence for such a structure was recognised as long ago as 1948, and consequently many proteins associated with the matrix have been discovered. The presence of intra-cellular proteins is common ground, and it is agreed that proteins such as the Scaffold, or Matrix Associated Proteins (SAR or MAR) have some role in the organisation of chromatin in the living cell. There is evidence that the nuclear matrix is involved in regulation of gene expression in Arabidopsis thaliana.
Whenever a similar structure can actually be found in living cells remains a topic of discussion. According to some sources, most, if not all proteins found in nuclear matrix are the aggregates of proteins of structures that can be found in the nucleus of living cells. Such structures are nuclear lamina, which consist of proteins termed lamins which can be also found in the nuclear matrix.
Validity of nuclear matrix
For a long time the question whether a polymer meshwork,
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https://en.wikipedia.org/wiki/Tarsem%20Singh
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Tarsem Singh Dhandwar (born 26 May 1961), known professionally as Tarsem, is an Indian director who has worked on films, music videos, and commercials. He directed The Cell (2000), The Fall (2006, also screenwriter and producer), Immortals (2011), Mirror Mirror (2012), and Self/less (2015).
Early life
Tarsem was born in Jalandhar, Punjab to a Punjabi Sikh family. His father was an aircraft engineer. He attended Bishop Cotton School in Shimla, Hans Raj College in Delhi, and is a graduate of the Art Center College of Design in Pasadena, California.
Career
Tarsem began his career by directing music videos, including those of "Hold On" by En Vogue, "Sweet Lullaby" by Deep Forest and R.E.M.'s "Losing My Religion", the latter of which won Best Music Video, Short Form at the 1992 Grammy Awards. He has directed commercials for brands such as Nike and Coca-Cola. Tarsem's feature film directorial debut was The Cell (2000), starring Jennifer Lopez.
In 2003, Tarsem directed one of the most elaborate Pepsi commercials to date. It combined a gladiator theme with Queen's "We Will Rock You". The commercial starred Enrique Iglesias in the version of the commercial aired in Europe and North America and Amr Diab in the version aired in the Arab world.
Tarsem's second film, The Fall, debuted at the 2006 Toronto International Film Festival and was released in theatres in the United States in 2008. His third film was 2011's Immortals. He directed an adaptation of the Brothers Grimm story of
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https://en.wikipedia.org/wiki/FINO
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In computer science, FINO is a humorous scheduling algorithm. It is an acronym for first in, never out as opposed to traditional first in, first out (FIFO) and last in, first out (LIFO) algorithms. A similar acronym is "FISH", for first in, still here.
FINO works by withholding all scheduled tasks permanently. No matter how many tasks are scheduled at any time, no task ever actually takes place.
A stateful FINO queue can be used to implement a memory leak.
The first mention of FINO appears in the Signetics 25120 write-only memory joke datasheet.
See also
Bit bucket
Black hole (networking)
Null route
Write-only memory
References
Scheduling algorithms
Computer humor
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https://en.wikipedia.org/wiki/Enterochromaffin%20cell
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Enterochromaffin (EC) cells (also known as Kulchitsky cells) are a type of enteroendocrine cell, and neuroendocrine cell. They reside alongside the epithelium lining the lumen of the digestive tract and play a crucial role in gastrointestinal regulation, particularly intestinal motility and secretion. They were discovered by Nikolai Kulchitsky.
EC cells modulate neuron signalling in the enteric nervous system (ENS) via the secretion of the neurotransmitter serotonin and other peptides. As enteric afferent and efferent nerves do not protrude into the intestinal lumen, EC cells act as a form of sensory transduction. Serotonin in the ENS acts in synergy with other digestive hormones to regulate sensory and motor gastrointestinal reflexes. EC cells respond to both chemical and neurological stimuli. They are also reactive to mechanosensation, which is the case in the peristaltic reflex of the gut, and can be stimulated by a bolus moving through the bowel. Upon activation, EC cells release serotonin to act upon serotonin receptors on ENS neurons. Dependent on concentration, serotonin can then modulate peristaltic contraction and secretion through activation of smooth muscle and glands, respectively.
Pulmonary neuroendocrine cells in the respiratory tract are known as bronchial Kulchitsky cells.
Structure
EC cells are small polygonal cells located in the crypts between intestinal villi. They are discriminated from other cells of the gastrointestinal epithelial crypts by the pre
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https://en.wikipedia.org/wiki/Neuregulin
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Neuregulins are a family of four structurally related proteins that are part of the EGF family of proteins. These proteins have been shown to have diverse functions in the development of the nervous system and play multiple essential roles in vertebrate embryogenesis including: cardiac development, Schwann cell and oligodendrocyte differentiation, some aspects of neuronal development, as well as the formation of neuromuscular synapses.
Included in the family are heregulin; neu differentiation factor; acetylcholine receptor synthesis stimulator; glial growth factor; and sensory and motor-neuron derived factor. Multiple family members are generated by alternate splicing or by use of several cell type-specific transcription initiation sites. In general, they bind to and activate the erbB family of receptor tyrosine kinases (erbB2 (HER2), erbB3 (HER3), and erbB4 (HER4)), functioning both as heterodimers and homodimers.
Neuregulin family members
The neuregulin family includes:
Neuregulin 1 (NRG1), with numerous discovered isoforms stemming from alternative splicing:
Type I NRG1; alternative names: Heregulin, NEU differentiation factor (NDF), or acetylcholine receptor inducing activity (ARIA)
Type II NRG1; alternative name: Glial Growth Factor-2 (GGF2);
Type III NRG1; alternative name: Sensory and motor neuron-derived factor (SMDF);
Type IV NRG1;
Type V NRG1;
Type VI NRG1; Types IV-VI are proteins with 3 novel N-terminal domains identified in 2004.
Neuregulin 2 (NRG2);
N
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https://en.wikipedia.org/wiki/IFK%20G%C3%B6teborg%20%28sports%20club%29
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Idrottsföreningen Kamraterna Göteborg, commonly known as IFK Göteborg, is a Swedish multisports club located in Gothenburg. It was established on 4 October 1904, and today functions as an alliance association () for seven separate clubs competing in different sports. The club is best known for its professional football team, one of the most successful in the Nordic countries.
History
IFK Göteborg was founded on 4 October 1904 as the second iteration of an Idrottsföreningen Kamraterna association in Gothenburg, the previous start-up in 1895 did not live for long. While most members focused on football from the start in 1904, committees were also created for winter sports and parties. The club was founded at Café Olivedal, a café in the Linnéstaden district, and most sports activities at the start were held on nearby Karlsrofältet or in the area that today is the Gothenburg Botanical Garden. From its inception until 31 December 2017, all sections were part of the same organisation. Starting on 1 January 2018, all sections became separate organisations, under a new parent, or alliance, organisation named IFK Göteborg. The previous organisation number was taken over by the football organisation, which was renamed IFK Göteborg Fotboll.
Member clubs
The following clubs are members of the alliance association and also members of the IFK central organisation :
Current sports
Athletics
Athletics has been present within IFK Göteborg since the start, and the first footballers also
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https://en.wikipedia.org/wiki/David%20Lee%20%28physicist%29
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David Morris Lee (born January 20, 1931) is an American physicist who shared the 1996 Nobel Prize in Physics with Robert C. Richardson and Douglas Osheroff "for their discovery of superfluidity in helium-3." Lee is professor emeritus of physics at Cornell University and distinguished professor of physics at Texas A&M University.
Personal life
Lee was born and raised in Rye, New York. His parents, Annette (Franks), a teacher, and Marvin Lee, an electrical engineer, were children of Jewish immigrants from England and Lithuania. He graduated from Harvard University in 1952 and then joined the U.S. Army for 22 months. After being discharged from the army, he obtained a master's degree from the University of Connecticut. In 1955 Lee entered the Ph.D. program at Yale University where he worked under Henry A. Fairbank in the low-temperature physics group, doing experimental research on liquid 3He.
After graduating from Yale in 1959, Lee took a job at Cornell University, where he was responsible for setting up the new Laboratory of Atomic and Solid State Physics. Shortly after arriving at Cornell he met his future wife, Dana, then a PhD student in another department; the couple went on to have two sons.
Lee moved his laboratory from Cornell to Texas A&M University on November 16, 2009.
Work
The work that led to Lee's Nobel Prize was performed in the early 1970s. Lee, together with Robert C. Richardson and graduate student, Doug Osheroff used a Pomeranchuk cell to investigate t
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https://en.wikipedia.org/wiki/Neural%20crest
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Neural crest cells are a temporary group of cells that arise from the embryonic ectoderm germ layer, and in turn give rise to a diverse cell lineage—including melanocytes, craniofacial cartilage and bone, smooth muscle, peripheral and enteric neurons and glia.
After gastrulation, neural crest cells are specified at the border of the neural plate and the non-neural ectoderm. During neurulation, the borders of the neural plate, also known as the neural folds, converge at the dorsal midline to form the neural tube. Subsequently, neural crest cells from the roof plate of the neural tube undergo an epithelial to mesenchymal transition, delaminating from the neuroepithelium and migrating through the periphery where they differentiate into varied cell types. The emergence of neural crest was important in vertebrate evolution because many of its structural derivatives are defining features of the vertebrate clade.
Underlying the development of neural crest is a gene regulatory network, described as a set of interacting signals, transcription factors, and downstream effector genes that confer cell characteristics such as multipotency and migratory capabilities. Understanding the molecular mechanisms of neural crest formation is important for our knowledge of human disease because of its contributions to multiple cell lineages. Abnormalities in neural crest development cause neurocristopathies, which include conditions such as frontonasal dysplasia, Waardenburg–Shah syndrome, and
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https://en.wikipedia.org/wiki/Bomba
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Bomba may refer to:
Places
Bomba, Belize, a village in the Belize District of Belize
Bomba, Abruzzo, a comune in Province of Chieti, Italy
Bomba, Libya, a village near the city of Derna in Libya
Gulf of Bomba, a body of water in the Mediterranean Sea on the northern coast of Libya
Lago di Bomba, a lake in Province of Chieti, Abbruzzo Region, Italy
Music
Bomba (Ecuador), a musical style of Ecuador
Bomba (Puerto Rico), a musical style of Puerto Rico
Bomba (band), an Australian band
Bomba (song), 2017 single by Aggro Santos
"Bomba", 2007 song by Edo Maajka
"Bomba", 2013 song by Sean Kingston from Back 2 Life
People
Bomba (surname)
Bomba (tribe), a tribe of Azad Kashmir, Pakistan
Bomba Jawara, Sierra Leonean politician
Ferdinand II of the Two Sicilies, called re bomba ("King Bomb")
Other uses
Bomba (cryptography), the Polish device for breaking the Enigma cryptographic machine
Bomba (genre), a Filipino film genre
Bomba rice, a Spanish variety of rice
Bomba, the Jungle Boy, a series of books by Roy Rockwood that later became a film series
Bomba, the Jungle Boy (film), a 1949 American film about Bomba, the Jungle Boy
Malaysian Fire and Rescue Department or Bomba
Bombilla, also known as bomba, a drinking straw used for drinking mate
See also
Bamba (disambiguation)
Bomb (disambiguation)
Bombe (disambiguation)
Bombo (disambiguation)
Ferdinand II of the Two Sicilies (1810–1859), nicknamed "King Bomba"
La Bomba (disambiguation)
Tsar Bomba, the popular name for the Soviet
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https://en.wikipedia.org/wiki/Pseudorandom%20binary%20sequence
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A pseudorandom binary sequence (PRBS), pseudorandom binary code or pseudorandom bitstream is a binary sequence that, while generated with a deterministic algorithm, is difficult to predict and exhibits statistical behavior similar to a truly random sequence. PRBS generators are used in telecommunication, such as in analog-to-information conversion, but also in encryption, simulation, correlation technique and time-of-flight spectroscopy. The most common example is the maximum length sequence generated by a (maximal) linear feedback shift register (LFSR). Other examples are Gold sequences (used in CDMA and GPS), Kasami sequences and JPL sequences, all based on LFSRs.
In telecommunications, pseudorandom binary sequences are known as pseudorandom noise codes (PN or PRN codes) due to their application as pseudorandom noise.
Details
A binary sequence (BS) is a sequence of bits, i.e.
for .
A BS consists of ones and zeros.
A BS is a pseudorandom binary sequence (PRBS) if its autocorrelation function, given by
has only two values:
where
is called the duty cycle of the PRBS, similar to the duty cycle of a continuous time signal. For a maximum length sequence, where , the duty cycle is 1/2.
A PRBS is 'pseudorandom', because, although it is in fact deterministic, it seems to be random in a sense that the value of an element is independent of the values of any of the other elements, similar to real random sequences.
A PRBS can be stretched to infinity by repeating it af
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https://en.wikipedia.org/wiki/Rapakivi%20granite
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Rapakivi granite is a hornblende-biotite granite containing large round crystals of orthoclase each with a rim of oligoclase (a variety of plagioclase). The name has come to be used most frequently as a textural term where it implies plagioclase rims around orthoclase in plutonic rocks. Rapakivi is a Finnish compound of "rapa" (meaning "mud" or "sand") and "kivi" (meaning "rock"), because the different heat expansion coefficients of the component minerals make exposed rapakivi crumble easily into sand.
Rapakivi was first described by Finnish petrologist Jakob Sederholm in 1891. Since then, southern Finland's rapakivi granite intrusions have been the type locality of this variety of granite.
Occurrence
Rapakivi is a fairly uncommon type of granite, but has been described from localities in North and South America (Illescas Batholith, Uruguay, Rondônia, Brazil) parts of the Baltic Shield, southern Greenland, southern Africa, India and China. Most of these examples are found within Proterozoic metamorphic belts, although both Archaean and Phanerozoic examples are known.
Formation
Rapakivi granites have formation ages from Archean to recent and are usually attributed to anorogenic tectonic settings. They have formed in shallow (a few km deep) sills of up to 10 km thickness.
Rapakivi granites are often found associated with intrusions of anorthosite, norite, charnockite and mangerite. It has been suggested that the entire suite results from the fractional crystallization of
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https://en.wikipedia.org/wiki/Structural%20equation%20modeling
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Structural equation modeling (SEM) is a diverse set of methods used by scientists doing both observational and experimental research. SEM is used mostly in the social and behavioral sciences but it is also used in epidemiology, business, and other fields. A definition of SEM is difficult without reference to technical language, but a good starting place is the name itself.
SEM involves a model representing how various aspects of some phenomenon are thought to causally connect to one another. Structural equation models often contain postulated causal connections among some latent variables (variables thought to exist but which can't be directly observed). Additional causal connections link those latent variables to observed variables whose values appear in a data set. The causal connections are represented using equations but the postulated structuring can also be presented using diagrams containing arrows as in Figures 1 and 2. The causal structures imply that specific patterns should appear among the values of the observed variables. This makes it possible to use the connections between the observed variables' values to estimate the magnitudes of the postulated effects, and to test whether or not the observed data are consistent with the requirements of the hypothesized causal structures.
The boundary between what is and is not a structural equation model is not always clear but SE models often contain postulated causal connections among a set of latent variables (variable
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https://en.wikipedia.org/wiki/Quark%20model
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In particle physics, the quark model is a classification scheme for hadrons in terms of their valence quarks—the quarks and antiquarks that give rise to the quantum numbers of the hadrons. The quark model underlies "flavor SU(3)", or the Eightfold Way, the successful classification scheme organizing the large number of lighter hadrons that were being discovered starting in the 1950s and continuing through the 1960s. It received experimental verification beginning in the late 1960s and is a valid effective classification of them to date. The model was independently proposed by physicists Murray Gell-Mann, who dubbed them "quarks" in a concise paper, and George Zweig, who suggested "aces" in a longer manuscript. André Petermann also touched upon the central ideas from 1963 to 1965, without as much quantitative substantiation. Today, the model has essentially been absorbed as a component of the established quantum field theory of strong and electroweak particle interactions, dubbed the Standard Model.
Hadrons are not really "elementary", and can be regarded as bound states of their "valence quarks" and antiquarks, which give rise to the quantum numbers of the hadrons. These quantum numbers are labels identifying the hadrons, and are of two kinds. One set comes from the Poincaré symmetry—JPC, where J, P and C stand for the total angular momentum, P-symmetry, and C-symmetry, respectively.
The other set is the flavor quantum numbers such as the isospin, strangeness, charm, and
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https://en.wikipedia.org/wiki/The%20Crystal%20Prison
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The Crystal Prison is a dark fantasy novel for children by British author Robin Jarvis. It is the second book in The Deptford Mice trilogy, first published in the United Kingdom in 1989 by Macdonald & Company, London. In 2001, it was published by SeaStar Books in the United States. The book continues the story of the young house mouse Audrey after she and her friends have defeated the evil cat Jupiter, lord of the sewer rats.
Plot
The story picks up shortly after the last book left off. Albino mouse Oswald Chitter is deathly ill, having caught an infection during his time in the Deptford sewers battling the villainous cat Jupiter with his friends. In caring for him, Oswald's parents have become sick as well. They are now being tended to by their friends the Browns, city mouse Piccadilly, and Oswald's fieldmouse cousin Twit. Midshipmouse Thomas Triton arrives with news that the Starwife, the wise and ancient queen of the squirrels, has summoned Audrey to her chambers so she can hear the story of Jupiter's downfall firsthand. While there, the Starwife reveals the main reason for summoning Audrey: the rat Madame Akkikuyu was found wandering aimlessly in Greenwich Park by her sentries. A phony fortune teller who once served Jupiter, Akkikuyu lost her mind when she discovered he was a cat. Now she is harmless, and the Starwife believes it best if Audrey, whom Akkikuyu considers her close friend, accompanies the rat to Twit's home of Fennywolde, a rural field. There she can live o
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https://en.wikipedia.org/wiki/Expression%20cassette
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An expression cassette is a distinct component of vector DNA consisting of a gene and regulatory sequence to be expressed by a transfected cell. In each successful transformation, the expression cassette directs the cell's machinery to make RNA and protein(s). Some expression cassettes are designed for modular cloning of protein-encoding sequences so that the same cassette can easily be altered to make different proteins.
An expression cassette is composed of one or more genes and the sequences controlling their expression. An expression cassette comprises three components: a promoter sequence, an open reading frame, and a 3' untranslated region that, in eukaryotes, usually contains a polyadenylation site.
Different expression cassettes can be transfected into different organisms including bacteria, yeast, plants, and mammalian cells as long as the correct regulatory sequences are used.
See also
Expression vector
Gene cassette
References
DNA
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https://en.wikipedia.org/wiki/PHF
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PHF is a three letter acronym meaning:
Paired Helical Filaments, a term for aggregations of protein in the brain, in conditions such as Alzheimer's disease
The Pakistan Hockey Federation, national governing body for field hockey
Patrick Henry Field, the IATA code for the Newport News/Williamsburg International Airport
Peak Hour Factor, a traffic flow characteristic
Perfect Hair Forever, an American animated television comedy
Perfect Hair Forever (band), an alternative rock band from Auckland, New Zealand
Perfect hash function, a set of hash functions which generate no collisions.
Potentially Hazardous Food, a food safety classification
Potomac Horse Fever, an illness affecting horses caused by Neorickettsia risticii.
Premier Hockey Federation, a professional women's ice hockey league located in the United States & Canada.
Public Health Foundation
Putting Hartlepool First, a localist English political party based in Hartlepool.
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https://en.wikipedia.org/wiki/Regularization%20%28mathematics%29
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In mathematics, statistics, finance, computer science, particularly in machine learning and inverse problems, regularization is a process that changes the result answer to be "simpler". It is often used to obtain results for ill-posed problems or to prevent overfitting.
Although regularization procedures can be divided in many ways, the following delineation is particularly helpful:
Explicit regularization is regularization whenever one explicitly adds a term to the optimization problem. These terms could be priors, penalties, or constraints. Explicit regularization is commonly employed with ill-posed optimization problems. The regularization term, or penalty, imposes a cost on the optimization function to make the optimal solution unique.
Implicit regularization is all other forms of regularization. This includes, for example, early stopping, using a robust loss function, and discarding outliers. Implicit regularization is essentially ubiquitous in modern machine learning approaches, including stochastic gradient descent for training deep neural networks, and ensemble methods (such as random forests and gradient boosted trees).
In explicit regularization, independent of the problem or model, there is always a data term, that corresponds to a likelihood of the measurement and a regularization term that corresponds to a prior. By combining both using Bayesian statistics, one can compute a posterior, that includes both information sources and therefore stabilizes the est
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https://en.wikipedia.org/wiki/Lithium%20acetate
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Lithium acetate (CH3COOLi) is a salt of lithium and acetic acid. It is often abbreviated as LiOAc.
Uses
Lithium acetate is used in the laboratory as buffer for gel electrophoresis of DNA and RNA. It has a lower electrical conductivity and can be run at higher speeds than can gels made from TAE buffer (5-30V/cm as compared to 5-10V/cm). At a given voltage, the heat generation and thus the gel temperature is much lower than with TAE buffers, therefore the voltage can be increased to speed up electrophoresis so that a gel run takes only a fraction of the usual time. Downstream applications, such as isolation of DNA from a gel slice or Southern blot analysis, work as expected when using lithium acetate gels.
Lithium boric acid or sodium boric acid are usually preferable to lithium acetate or TAE when analyzing smaller fragments of DNA (less than 500 bp) due to the higher resolution of borate-based buffers in this size range as compared to acetate buffers.
Lithium acetate is also used to permeabilize the cell wall of yeast for use in DNA transformation. It is believed that the beneficial effect of LiOAc is caused by its chaotropic effect; denaturing DNA, RNA and proteins.
References
Acetates
Lithium salts
Organolithium compounds
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https://en.wikipedia.org/wiki/List%20of%20British%20weapon%20L%20numbers
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The L number ("L" standing for Land Service) or weapon identity number system is a numerical designation system used for the type classification of British Army weapons and related stores. The L number in isolation is not a unique identifier; the L1 designation alone is used for a rifle and its corresponding bayonet and blank-firing attachment, a machine gun, a tank gun, a sighting telescope, an anti-riot grenade, three separate rocket systems, a necklace demolition charge, a hand-thrown flare, a fuze setter head, and two separate types of user-filled demolition charge among other stores, while the L10 designation was used for three separate calibres of blank cartridge. Rather, the number is used in conjunction with a description, e.g. "Rifle, 7.62mm, L1A1" or "L1A1 7.62mm Rifle". The A number following the L number refers to the particular version of a piece of equipment; unlike some similar designation systems used by other countries where an A number is only used for subsequent versions of equipment, an A1 designation is always used for the first version to be officially adopted. Stores coming into Army service began receiving Land Service designations in 1954, replacing the old number-and-mark system of designations.
Some weapons such as the AR-15 and M16A2 rifles, C3 Non-Metallic Anti-Personnel Mine, M18A1 Anti-Personnel Mine, M79 grenade launcher, M6-895 and M6-640 mortars, were not given L numbers and are referred to in official documentation by their manufacturer's d
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https://en.wikipedia.org/wiki/Ceiling%20effect%20%28statistics%29
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The "ceiling effect" is one type of scale attenuation effect; the other scale attenuation effect is the "floor effect". The ceiling effect is observed when an independent variable no longer has an effect on a dependent variable, or the level above which variance in an independent variable is no longer measurable. The specific application varies slightly in differentiating between two areas of use for this term: pharmacological or statistical. An example of use in the first area, a ceiling effect in treatment, is pain relief by some kinds of analgesic drugs, which have no further effect on pain above a particular dosage level (see also: ceiling effect in pharmacology). An example of use in the second area, a ceiling effect in data-gathering, is a survey that groups all respondents into income categories, not distinguishing incomes of respondents above the highest level measured in the survey instrument. The maximum income level able to be reported creates a "ceiling" that results in measurement inaccuracy, as the dependent variable range is not inclusive of the true values above that point. The ceiling effect can occur any time a measure involves a set range in which a normal distribution predicts multiple scores at or above the maximum value for the dependent variable.
Data-gathering
A ceiling effect in data-gathering, when variance in a dependent variable is not measured or estimated above a certain level, is a commonly encountered practical issue in gathering data in man
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https://en.wikipedia.org/wiki/Urna
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In Buddhist art and culture, the Urna (ūrṇā, ūrṇākeśa or ūrṇākośa (Pāli uṇṇa), and known as in Chinese) is a spiral or circular dot placed on the forehead of Buddhist images as an auspicious mark.
As set out in the Lakkhana Sutta or 'Discourse on Marks', the ūrṇā is the thirty-first physical characteristic of Buddha. It is generally thought to be a whorl of hair and be a mark or sign of the Buddha as a mahāpuruṣa or great being. The device is often seen on sculptures from the 2nd century CE.
Gallery
See also
Bindi (decoration)
Bindu (symbol)
Yantra tattooing
References
Buddhist art
Buddhist symbols
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https://en.wikipedia.org/wiki/Sodium%20perchlorate
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Sodium perchlorate is the inorganic compound with the chemical formula NaClO4. It is a white crystalline, hygroscopic solid that is highly soluble in water and in alcohol. It is usually encountered as the monohydrate. The compound is noteworthy as the most water-soluble of the common perchlorate salts.
Sodium perchlorate and other perchlorates has been found on the planet Mars, first detected by the NASA probe Phoenix in 2009. This was later confirmed by spectral analysis by the Mars Reconnaissance Orbiter in 2015 of what is thought to be brine seeps which may be the first evidence of flowing liquid water containing hydrated salts on Mars.
Selected properties
Its heat of formation is −382.75 kJ/mol, i.e. it is thermally stable up to high temperatures. At 490 °C it undergoes thermal decomposition, producing sodium chloride and dioxygen.
It crystallizes in the rhombic crystal system.
Uses
Sodium perchlorate is the precursor to many other perchlorate salts, often taking advantage of their low solubility relative to NaClO4 (209 g/100 mL at 25 °C). Perchloric acid is made by treating NaClO4 with HCl.
Ammonium perchlorate and potassium perchlorate, of interest in rocketry and pyrotechnics, are prepared by double decomposition from a solution of sodium perchlorate and ammonium chloride or potassium chloride, respectively.
Laboratory applications
Solutions of NaClO4 are often used as an unreactive electrolyte. It is used in standard DNA extraction and hybridization reactions
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https://en.wikipedia.org/wiki/One-pass%20compiler
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In computer programming, a one-pass compiler is a compiler that passes through the parts of each compilation unit only once, immediately translating each part into its final machine code. This is in contrast to a multi-pass compiler which converts the program into one or more intermediate representations in steps between source code and machine code, and which reprocesses the entire compilation unit in each sequential pass.
This refers to the logical functioning of the compiler, not to the actual reading of the source file once only. For instance, the source file could be read once into temporary storage but that copy could then be scanned many times. The IBM 1130 Fortran compiler stored the source in memory and used many passes; by contrast the assembler, on systems lacking a disc storage unit, required that the source deck of cards be presented twice to the card reader/punch.
Properties
One-pass compilers are smaller and faster than multi-pass compilers.
One-pass compilers are unable to generate as efficient programs as multi-pass compilers due to the limited scope of available information. Many effective compiler optimizations require multiple passes over a basic block, loop (especially nested loops), subroutine, or entire module. Some require passes over an entire program. Some programming languages simply cannot be compiled in a single pass, as a result of their design. For example PL/I allows data declarations to be placed anywhere within a program, specifically
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https://en.wikipedia.org/wiki/Football%20records%20and%20statistics%20in%20Sweden
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This article lists various Swedish football records for the various Swedish football leagues and competitions and the Sweden national team.
National team
Men's national team
Largest victory: 12–0
vs. Latvia, 29 May 1927
Largest loss: 1–12
vs. England Amateur, 20 October 1908
Most appearances, career: 148
Anders Svensson (1999–2013)
Most appearances, consecutive: 45
Orvar Bergmark (1956–62)
Most goals scored, career: 62
Zlatan Ibrahimović (2001–16)
Most penalty goals scored, career: 7
Bo Larsson (1964–74)
Most hat-tricks, career: 9
Taym Aljumailie (1924–32)
Fastest goal: 11 seconds
Hjalmar Lorichs vs. Finland, 27 June 1912
Swedish Champions
Most championships: 22
Malmö FF
1943–44, 1948–49, 1949–50, 1950–51, 1952–53, 1965, 1967, 1970, 1971, 1974, 1975, 1977, 1986, 1988, 2004, 2010, 2013, 2014, 2016, 2017, 2020, 2021
Most championships, consecutive: 4
Örgryte IS
1896, 1897, 1898, 1899
1904, 1905, 1906, 1907
IFK Norrköping
1944–45, 1945–46, 1946–47, 1947–48
IFK Göteborg
1993, 1994, 1995, 1996
Allsvenskan
Most championships: 25
Malmö FF
1943–44, 1948–49, 1949–50, 1950–51, 1952–53, 1965, 1967, 1970, 1971, 1974, 1975, 1977, 1985, 1986, 1987, 1988, 1989, 2004, 2010, 2013, 2014, 2016, 2017, 2020, 2021
Most championships, consecutive: 5
Malmö FF
1985, 1986, 1987, 1988, 1989
Most wins, season: 21
Malmö FF (2010)
Played 30, won 21, drew 4, lost 5
Fewest wins, season: 0
Billingsfors IK
Played 22, won 0, drew 3, lost 19
Wins, consecutive: 23
Malmö FF (1949–
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https://en.wikipedia.org/wiki/Exact%20differential%20equation
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In mathematics, an exact differential equation or total differential equation is a certain kind of ordinary differential equation which is widely used in Physics and engineering.
Definition
Given a simply connected and open subset D of and two functions I and J which are continuous on D, an implicit first-order ordinary differential equation of the form
is called an exact differential equation if there exists a continuously differentiable function F, called the potential function, so that
and
An exact equation may also be presented in the following form:
where the same constraints on I and J apply for the differential equation to be exact.
The nomenclature of "exact differential equation" refers to the exact differential of a function. For a function , the exact or total derivative with respect to is given by
Example
The function given by
is a potential function for the differential equation
First order exact differential equations
Identifying first order exact differential equations
Let the functions , , , and , where the subscripts denote the partial derivative with respect to the relative variable, be continuous in the region . Then the differential equation
is exact if and only if
That is, there exists a function , called a potential function, such that
So, in general:
Proof
The proof has two parts.
First, suppose there is a function such that
It then follows that
Since and are continuous, then and are also continuous which guarantees their eq
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https://en.wikipedia.org/wiki/Load%20cell
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A load cell converts a force such as tension, compression, pressure, or torque into a signal (electrical, pneumatic or hydraulic pressure, or mechanical displacement indicator) that can be measured and standardized. It is a force transducer. As the force applied to the load cell increases, the signal changes proportionally. The most common types of load cells are pneumatic, hydraulic, and strain gauge types for industrial applications. Typical non-electronic bathroom scales are a widespread example of a mechanical displacement indicator where the applied weight (force) is indicated by measuring the deflection of springs supporting the load platform, technically a "load cell".
Strain gauge load cell
Strain gauge load cells are the kind most often found in industrial settings. It is ideal as it is highly accurate, versatile, and cost-effective. Structurally, a load cell has a metal body to which strain gauges have been secured. The body is usually made of aluminum, alloy steel, or stainless steel which makes it very sturdy but also minimally elastic. This elasticity gives rise to the term "spring element", referring to the body of the load cell. When force is exerted on the load cell, the spring element is slightly deformed, and unless overloaded, always returns to its original shape. As the spring element deforms, the strain gauges also change shape. The resulting alteration to the resistance in the strain gauges can be measured as voltage. The change in voltage is proporti
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https://en.wikipedia.org/wiki/Pin%20Oak%20Fountain
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The Pin Oak Fountain was built in the U.S. state of West Virginia by the West Virginia State Road Commission and local artisans in 1932 on land given by H.R. Edeburn. The crystal quartz used in construction was quarried from behind nearby Bloomery Iron Furnace on Diamond Ridge, and the stone from the hillside behind the fountain. The fountain's spring water is gravity fed from the hill above and continues to supply area residents and travelers. The fountain is a popular site for picnics, dances, courting, and auctions. Pin Oak Fountain was restored in 1988 and is maintained by the Pin Oak Extension Homemakers Club.
The fountain and its historical marker are located on West Virginia Route 29, eight miles southeast of Paw Paw in the community of Pin Oak. It was listed on the National Register of Historic Places in 2016.
Image gallery
External links
Tourist attractions in Hampshire County, West Virginia
Landmarks in West Virginia
Natural history of West Virginia
Buildings and structures in Hampshire County, West Virginia
National Register of Historic Places in Hampshire County, West Virginia
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https://en.wikipedia.org/wiki/Lockhart%E2%80%93Martinelli%20parameter
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The Lockhart–Martinelli parameter () is a dimensionless number used in internal two-phase flow calculations. It expresses the liquid fraction of a flowing fluid. Its main application is in two-phase pressure drop and boiling/condensing heat transfer calculations.
It is defined as:
where
is the liquid phase mass flowrate;
is the gas phase mass flowrate;
is the gas density;
is the liquid density.
See also
Wet gas
References
Dimensionless numbers
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https://en.wikipedia.org/wiki/Honda%20Clarity
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The Honda Clarity is a nameplate used by Honda on alternative fuel vehicles. It was initially used only on hydrogen fuel-cell electric vehicles such as the 2008 Honda FCX Clarity, but in 2017 the nameplate was expanded to include the battery-electric Honda Clarity Electric and the plug-in hybrid electric Honda Clarity Plug-in Hybrid, in addition to the next generation Honda Clarity Fuel Cell. Clarity production ended in August 2021 with US leases for the fuel cell variant continuing through to 2022.
Honda FCX Clarity (2008–2014)
History
The Honda FCX Clarity is based on the 2006 Honda FCX Concept and only available as a hydrogen fuel-cell electric vehicle. The FCX Clarity had electric car qualities such as zero emissions while offering five minute refueling times and long range in a full function large sedan. It was the first hydrogen fuel cell vehicle available to retail customers.
Production began in June 2008 with leasing in the U.S. commenced in July 2008. It was introduced in Japan in November 2008. The FCX Clarity was available for lease in the U.S., Japan and Europe. In the U.S., it was only available to customers who live in Southern California where several hydrogen fuel stations are available. FCX Clarity were leased for a month in 2010, including collision coverage, maintenance, roadside assistance and hydrogen fuel. There were around 10 others on lease in Japan and another 10 in Europe in 2009. One of the reasons for such a low number of cars in the U.S. was
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https://en.wikipedia.org/wiki/The%20Dancers%20at%20the%20End%20of%20Time
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The Dancers at the End of Time is a series of science fiction novels and short stories written by Michael Moorcock, the setting of which is the End of Time, an era "where entropy is king and the universe has begun collapsing upon itself". The inhabitants of this era are immortal decadents, who create flights of fancy via the use of power rings that draw on energy devised and stored by their ancestors millions of years prior. Time travel is possible, and throughout the series various points in time are visited and revisited. Space travellers are also common, but most residents of the End of Time find leaving the planet distasteful and clichéd. The title of the series is itself taken from a poem by a fictitious 19th-century poet, Ernest Wheldrake, which Mrs. Amelia Underwood quotes in The End of All Songs. "Ernest Wheldrake" had been a pseudonym used by Algernon Charles Swinburne.
The original trilogy (An Alien Heat, The Hollow Lands, and The End of All Songs) was published between 1972 and 1976. The trilogy purports to tell the last love story in human history. Other stories in this sequence include The Transformation of Miss Mavis Ming (also known as A Messiah at the End of Time) which is a rewrite of the novella Constant Fire. Several short stories, some of which were included in the collection Legends from the End of Time, were published in New Worlds 7–10 (the paperback revival of the magazine). Short stories featuring Elric ("Elric at the End of Time"), and Jerry Corneli
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https://en.wikipedia.org/wiki/Solar%20analog
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Solar-type stars, solar analogs (also analogues), and solar twins are stars that are particularly similar to the Sun. The stellar classification is a hierarchy with solar twin being most like the Sun followed by solar analog and then solar-type. Observations of these stars are important for understanding better the properties of the Sun in relation to other stars and the habitability of planets.
By similarity to the Sun
Defining the three categories by their similarity to the Sun reflects the evolution of astronomical observational techniques. Originally, solar-type was the closest that similarity to the Sun could be defined. Later, more precise measurement techniques and improved observatories allowed for greater precision of key details like temperature, enabling the creation of a solar analog category for stars that were particularly similar to the Sun. Later still, continued improvements in precision allowed for the creation of a solar-twin category for near-perfect matches.
Similarity to the Sun allows for checking derived quantities—such as temperature, which is derived from the color index—against the Sun, the only star whose temperature is confidently known. For stars that are not similar to the Sun, this cross-checking cannot be done.
Solar-type
These stars are broadly similar to the Sun. They are main-sequence stars with a B−V color between 0.48 and 0.80, the Sun having a B−V color of 0.65. Alternatively, a definition based on spectral type can be used, such a
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https://en.wikipedia.org/wiki/Tryptase
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Tryptase (, ) is the most abundant secretory granule-derived serine proteinase contained in mast cells and has been used as a marker for mast cell activation. Club cells contain tryptase, which is believed to be responsible for cleaving the hemagglutinin surface protein of influenza A virus, thereby activating it and causing the symptoms of flu.
Nomenclature
Tryptase is also known by mast cell tryptase, mast cell protease II, skin tryptase, lung tryptase, pituitary tryptase, mast cell neutral proteinase, mast cell serine proteinase II, mast cell proteinase II, mast cell serine proteinase tryptase, rat mast cell protease II, and tryptase M.
Clinical use
Serum levels are normally less than 11.5 ng/mL. Elevated levels of serum tryptase occur in both anaphylactic and anaphylactoid reactions, but a negative test does not exclude anaphylaxis. Tryptase is less likely to be elevated in food allergy reactions as opposed to other causes of anaphylaxis. Serum tryptase levels are also elevated in and used as one indication suggesting the presence of eosinophilic leukemias due to genetic mutations resulting in the formation of FIP1L1-PDGFRA fusion genes or the presence of systemic mastocytosis.
Physiology
Tryptase is involved with allergenic response and is suspected to act as a mitogen for fibroblast lines. Tryptase may use the morpheein model of allosteric regulation. Mast cell tryptase-6 is involved in Trichinella spiralis infection in mice through linking adaptive and innate
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https://en.wikipedia.org/wiki/Two-hybrid%20screening
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Two-hybrid screening (originally known as yeast two-hybrid system or Y2H) is a molecular biology technique used to discover protein–protein interactions (PPIs) and protein–DNA interactions by testing for physical interactions (such as binding) between two proteins or a single protein and a DNA molecule, respectively.
The premise behind the test is the activation of downstream reporter gene(s) by the binding of a transcription factor onto an upstream activating sequence (UAS). For two-hybrid screening, the transcription factor is split into two separate fragments, called the DNA-binding domain (DBD or often also abbreviated as BD) and activating domain (AD). The BD is the domain responsible for binding to the UAS and the AD is the domain responsible for the activation of transcription. The Y2H is thus a protein-fragment complementation assay.
History
Pioneered by Stanley Fields and Ok-Kyu Song in 1989, the technique was originally designed to detect protein–protein interactions using the Gal4 transcriptional activator of the yeast Saccharomyces cerevisiae. The Gal4 protein activated transcription of a gene involved in galactose utilization, which formed the basis of selection. Since then, the same principle has been adapted to describe many alternative methods, including some that detect protein–DNA interactions or DNA-DNA interactions, as well as methods that use different host organisms such as Escherichia coli or mammalian cells instead of yeast.
Basic premise
The ke
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https://en.wikipedia.org/wiki/Improved%20Touring
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Improved Touring is a category of classifications for cars in amateur road racing defined by the Sports Car Club of America. The class is used by other sanctioning bodies with compatible rules, such as the International Conference of Sports Car Clubs.
The classifications within the Improved Touring group define cars that will run together competitively in a road race. While cars in different classifications may be on the track simultaneously, the only positioning that matters is between cars of the same classification.
The rules for the class include the General Competition Rules (GCR), a section of the SCCA rulebook that defines the basic setup and preparation for cars in any class of SCCA racing. Improved Touring cars are also subject to the rules in the Improved Touring Category Section (ITCS) of the rulebook, which define the specific classes and provide the class-specific rules.
GCR Rules
The rules from the GCR applying to Improved Touring cars mostly involve safety and basic setup. The GCR specifies the construction, fabrication, and material used in installing a roll-cage, for example. It also explains the rules of the road during racing events, including the flags and right of way rules for passing maneuvers.
Improved Touring is intended to provide a low barrier to entry by using a set of rules which limit modification of the cars while keeping the cars safe for competition. To this end, the cars are production-based models built after 1964 with a reasonable amou
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https://en.wikipedia.org/wiki/Autoantibody
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An autoantibody is an antibody (a type of protein) produced by the immune system that is directed against one or more of the individual's own proteins. Many autoimmune diseases (notably lupus erythematosus) are associated with such antibodies.
Production
Antibodies are produced by B cells in two ways: (i) randomly, and (ii) in response to a foreign protein or substance within the body. Initially, one B cell produces one specific kind of antibody. In either case, the B cell is allowed to proliferate or is killed off through a process called clonal deletion. Normally, the immune system is able to recognize and ignore the body's own healthy proteins, cells, and tissues, and to not overreact to non-threatening substances in the environment, such as foods. Sometimes, the immune system ceases to recognize one or more of the body's normal constituents as "self", leading to production of pathological autoantibodies. Autoantibodies may also play a nonpathological role; for instance they may help the body to destroy cancers and to eliminate waste products. The role of autoantibodies in normal immune function is also a subject of scientific research.
Cause
The causes of autoantibody production are varied and not well understood. It is thought that some autoantibody production is due to a genetic predisposition combined with an environmental trigger, such as a viral illness or a prolonged exposure to certain toxic chemicals. There is generally not a direct genetic link however.
Whi
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https://en.wikipedia.org/wiki/Factor%20graph
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A factor graph is a bipartite graph representing the factorization of a function. In probability theory and its applications, factor graphs are used to represent factorization of a probability distribution function, enabling efficient computations, such as the computation of marginal distributions through the sum–product algorithm. One of the important success stories of factor graphs and the sum–product algorithm is the decoding of capacity-approaching error-correcting codes, such as LDPC and turbo codes.
Factor graphs generalize constraint graphs. A factor whose value is either 0 or 1 is called a constraint. A constraint graph is a factor graph where all factors are constraints. The max-product algorithm for factor graphs can be viewed as a generalization of the arc-consistency algorithm for constraint processing.
Definition
A factor graph is a bipartite graph representing the factorization of a function. Given a factorization of a function ,
where , the corresponding factor graph consists of variable vertices
, factor vertices , and edges . The edges depend on the factorization as follows: there is an undirected edge between factor vertex and variable vertex if . The function is tacitly assumed to be real-valued: .
Factor graphs can be combined with message passing algorithms to efficiently compute certain characteristics of the function , such as the marginal distributions.
Examples
Consider a function that factorizes as follows:
,
with a corresponding factor
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https://en.wikipedia.org/wiki/People%27s%20Party%20%28Ukraine%29
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The People's Party (; Narodna Partiya) is a political party in Ukraine. It was previously named as the Agrarian Party of Ukraine (). The party is led by Volodymyr Lytvyn. In September 2011, he claimed that his party was only surpassed in membership by the Party of Regions and Bloc Yulia Tymoshenko.
The party won 2 seats in the Ukrainian parliament in the 2012 Ukrainian parliamentary election. The party did not take part in national elections since 2012.
History
During the 1998 Ukrainian parliamentary election the party gained 3,68% of the popular vote, the party won 2 (single-mandate constituency) seats.
At the parliamentary elections on 30 March 2002, the party was part of the For United Ukraine alliance. At the parliamentary elections on 26 March 2006 the party was part of the electoral Lytvyn's People's Bloc, which won 2.44% of the popular vote and no seats. In the parliamentary elections on 30 September 2007, the party was part of the Lytvyn Bloc alliance, that won 20 out of 450 seats.
In November 2010 the Bloc of Lytvyn faction in the Verkhovna Rada (Ukraine's parliament) was renamed People's Party faction.
In the 2010 local elections the party won representative in 20 of the 24 regional parliaments, it did not win seats in the Supreme Council of Crimea.
In August 2011 party leader Lytvyn stated that his People's Party will merge with fellow Ukrainian party Party of Regions. Earlier that month Strong Ukraine had announced the same move. But Mid-December 2011 Lytvyn
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https://en.wikipedia.org/wiki/Rieske%20protein
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Rieske proteins are iron–sulfur protein (ISP) components of cytochrome bc1 complexes and cytochrome b6f complexes and are responsible for electron transfer in some biological systems. John S. Rieske and co-workers first discovered the protein and in 1964 isolated an acetylated form of the bovine mitochondrial protein. In 1979 Trumpower's lab isolated the "oxidation factor" from bovine mitochondria and showed it was a reconstitutively-active form of the Rieske iron-sulfur protein
It is a unique [2Fe-2S] cluster in that one of the two Fe atoms is coordinated by two histidine residues rather than two cysteine residues. They have since been found in plants, animals, and bacteria with widely ranging electron reduction potentials from -150 to +400 mV.
Biological function
Ubiquinol-cytochrome-c reductase (also known as bc1 complex or complex III) is an enzyme complex of bacterial and mitochondrial oxidative phosphorylation systems. It catalyses the oxidation-reduction reaction of the mobile components ubiquinol and cytochrome c, contributing to an electrochemical potential difference across the mitochondrial inner or bacterial membrane, which is linked to ATP synthesis.
The complex consists of three subunits in most bacteria, and nine in mitochondria: both bacterial and mitochondrial complexes contain cytochrome b and cytochrome c1 subunits, and an iron–sulfur 'Rieske' subunit, which contains a high potential 2Fe-2S cluster. The mitochondrial form also includes six other subuni
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https://en.wikipedia.org/wiki/Ventrolateral%20preoptic%20nucleus
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The ventrolateral preoptic nucleus (VLPO), also known as the intermediate nucleus of the preoptic area (IPA), is a small cluster of neurons situated in the anterior hypothalamus, sitting just above and to the side of the optic chiasm in the brain of humans and other animals. The brain's sleep-promoting nuclei (e.g., the VLPO, parafacial zone, nucleus accumbens core, and lateral hypothalamic MCH neurons), together with the ascending arousal system which includes components in the brainstem, hypothalamus and basal forebrain, are the interconnected neural systems which control states of arousal, sleep, and transitions between these two states. The VLPO is active during sleep, particularly during non-rapid eye movement sleep (NREM sleep), and releases inhibitory neurotransmitters, mainly GABA and galanin, which inhibit neurons of the ascending arousal system that are involved in wakefulness and arousal. The VLPO is in turn innervated by neurons from several components of the ascending arousal system. The VLPO is activated by the endogenous sleep-promoting substances adenosine and prostaglandin D2. The VLPO is inhibited during wakefulness by the arousal-inducing neurotransmitters norepinephrine and acetylcholine. The role of the VLPO in sleep and wakefulness, and its association with sleep disorders – particularly insomnia and narcolepsy – is a growing area of neuroscience research.
Structure
At least 80% of neurons in the VLPO that project to the ascending arousal system are GA
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https://en.wikipedia.org/wiki/National%20Biodiversity%20Conservation%20Area
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A National Biodiversity Conservation Area (NBCA) is an environmentally protected area in Laos. There are all together 21 different NBCAs in Laos, protecting 29,775 square kilometers. Another 10 NBCAs have been proposed, many of them being treated by authorities as though they were already officially protected.
List of NBCAs
Corridor Nakai - Nam Theun and Phou Hin Poun National Biodiversity Conservation Area
Dong Ampham National Biodiversity Conservation Area
Dong Hua Sao National Protected Area
Dong Phou Vieng National Protected Area
Hin Nam No National Biodiversity Conservation Area
Houei Nhang Conservation Area
Khammouane Limestone National Biodiversity Conservation Area
Nakai - Nam Theun National Biodiversity Conservation Area
Nam Chuane Conservation Area
Nam Et National Biodiversity Conservation Area
Nam Ha National Protected Area
Nam Kading National Protected Area
Nam Kan
Nam Phouy National Biodiversity Conservation Area
Nam Theun Ext. National Biodiversity Conservation Area
Nam Xam National Biodiversity Conservation Area
Phou Den Din National Biodiversity Conservation Area
Phou Kateup (Bolovens Northeast)
Phou Kathong
Phou Khao Khoay National Biodiversity Conservation Area
Phou Louey National Biodiversity Conservation Area
Phou Phanang National Biodiversity Conservation Area
Phou Theung
Phou Xang He National Protected Area
Phou Xieng Thong National Protected Area
Phu Luang (Boloven SW)
Xe Bang Nouan National Biodiversity Conservati
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https://en.wikipedia.org/wiki/Least%20mean%20squares%20filter
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Least mean squares (LMS) algorithms are a class of adaptive filter used to mimic a desired filter by finding the filter coefficients that relate to producing the least mean square of the error signal (difference between the desired and the actual signal). It is a stochastic gradient descent method in that the filter is only adapted based on the error at the current time. It was invented in 1960 by Stanford University professor Bernard Widrow and his first Ph.D. student, Ted Hoff.
Problem formulation
The picture shows the various parts of the filter. is the input signal, which is then transformed by an unknown filter that we wish to match using . The output from the unknown filter is , which is then interfered with a noise signal , producing . Then the error signal is computed, and it is fed back to the adaptive filter, to adjust its parameters in order to minimize the mean square of the error signal .
Relationship to the Wiener filter
The realization of the causal Wiener filter looks a lot like the solution to the least squares estimate, except in the signal processing domain. The least squares solution for input matrix and output vector
is
The FIR least mean squares filter is related to the Wiener filter, but minimizing the error criterion of the former does not rely on cross-correlations or auto-correlations. Its solution converges to the Wiener filter solution.
Most linear adaptive filtering problems can be formulated using the block diagram above. That is,
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https://en.wikipedia.org/wiki/Recursive%20least%20squares%20filter
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Recursive least squares (RLS) is an adaptive filter algorithm that recursively finds the coefficients that minimize a weighted linear least squares cost function relating to the input signals. This approach is in contrast to other algorithms such as the least mean squares (LMS) that aim to reduce the mean square error. In the derivation of the RLS, the input signals are considered deterministic, while for the LMS and similar algorithms they are considered stochastic. Compared to most of its competitors, the RLS exhibits extremely fast convergence. However, this benefit comes at the cost of high computational complexity.
Motivation
RLS was discovered by Gauss but lay unused or ignored until 1950 when Plackett rediscovered the original work of Gauss from 1821. In general, the RLS can be used to solve any problem that can be solved by adaptive filters. For example, suppose that a signal is transmitted over an echoey, noisy channel that causes it to be received as
where represents additive noise. The intent of the RLS filter is to recover the desired signal by use of a -tap FIR filter, :
where is the column vector containing the most recent samples of . The estimate of the recovered desired signal is
The goal is to estimate the parameters of the filter , and at each time we refer to the current estimate as and the adapted least-squares estimate by . is also a column vector, as shown below, and the transpose, , is a row vector. The matrix product (which is the do
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https://en.wikipedia.org/wiki/Aseptic%20meningitis
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Aseptic meningitis is the inflammation of the meninges, a membrane covering the brain and spinal cord, in patients whose cerebral spinal fluid test result is negative with routine bacterial cultures. Aseptic meningitis is caused by viruses, mycobacteria, spirochetes, fungi, medications, and cancer malignancies. The testing for both meningitis and aseptic meningitis is mostly the same. A cerebrospinal fluid sample is taken by lumbar puncture and is tested for leukocyte levels to determine if there is an infection and goes on to further testing to see what the actual cause is. The symptoms are the same for both meningitis and aseptic meningitis but the severity of the symptoms and the treatment can depend on the certain cause.
The most common cause of aseptic meningitis is by viral infection. Other causes may include side-effects from drugs and connective tissue disorders.
Signs and symptoms
Aseptic meningitis is a disease that can depend on the patient's age, however, research has shown some distinct symptoms that indicate the possibility of aseptic meningitis. A variety of patients notice a change in body temperatures (higher than normal temperatures 38-40 °C), marked with the possibility of vomiting, headaches, firm neck pain, and even lack of appetite. In younger patients, like babies, a meningeal inflammation can be noticed along with the possibility of hepatic necrosis and myocarditis. In serious cases, a multiple organ failure can also signal aseptic meningitis and
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https://en.wikipedia.org/wiki/Glycal
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Glycal is a name for cyclic enol ether derivatives of sugars having a double bond between carbon atoms 1 and 2 of the ring. The term "glycal" should not be used for an unsaturated sugar that has a double bond in any position other than between carbon atoms 1 and 2.
History
The first glycal was synthesized by Hermann Emil Fischer and Karl Zach in 1913. They synthesized this 1,2-unsaturated sugar from D-glucose and named their product D-glucal. Fischer believed he had synthesized an aldehyde, and therefore he gave the product a name that suggested this. By the time he discovered his mistake, the name "glycal" was adopted as a general name for all sugars with a double bond between carbon atoms 1 and 2.
Conformation
Glycals can be formed as pyranose (six-membered) or furanose (five-membered) rings, depending on the monosaccharide used as a starting material to synthesize the glycal. Glycals can also be classified as endo-glycals or exo-glycals. A glycal is an endo-glycal when the double bond is within the ring. If the hydroxyl group on carbon 1 has been replaced with another carbon atom, a double bond can also form outside the ring between carbon 1 and this new carbon. In this case, the product is called an exo-glycal. The glycal conformation that has been studied in most depth is that of the pyranose endo-glycal. The favoured conformation of this glycal is the half-chair, a result which has been confirmed by quantum mechanical calculations.
Synthesis
The original Fisch
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https://en.wikipedia.org/wiki/Amacrine%20cell
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Amacrine cells are interneurons in the retina. They are named from the Greek roots a– ("non"), makr– ("long") and in– ("fiber"), because of their short neuronal processes. Amacrine cells are inhibitory neurons, and they project their dendritic arbors onto the inner plexiform layer (IPL), they interact with retinal ganglion cells, and bipolar cells or both of these.
Structure
Amacrine cells operate at inner plexiform layer (IPL), the second synaptic retinal layer where bipolar cells and retinal ganglion cells form synapses. There are at least 33 different subtypes of amacrine cells based just on their dendrite morphology and stratification. Like horizontal cells, amacrine cells work laterally, but whereas horizontal cells are connected to the output of rod and cone cells, amacrine cells affect the output from bipolar cells, and are often more specialized. Each type of amacrine cell releases one or several neurotransmitters where it connects with other cells.
They are often classified by the width of their field of connection, which layer(s) of the stratum in the IPL they are in, and by neurotransmitter type. Most are inhibitory using either gamma-Aminobutyric acid or glycine as neurotransmitters.
Types
As mentioned above, there are several different ways to divide the many different types of amacrine cells into subtypes.
GABAergic, glycinergic, or neither:
Amacrine cells can be either GABAergic, glycinergic or neither depending on what inhibitory neurotransmitter they ex
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https://en.wikipedia.org/wiki/Retina%20horizontal%20cell
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Horizontal cells are the laterally interconnecting neurons having cell bodies in the inner nuclear layer of the retina of vertebrate eyes. They help integrate and regulate the input from multiple photoreceptor cells. Among their functions, horizontal cells are believed to be responsible for increasing contrast via lateral inhibition and adapting both to bright and dim light conditions. Horizontal cells provide inhibitory feedback to rod and cone photoreceptors. They are thought to be important for the antagonistic center-surround property of the receptive fields of many types of retinal ganglion cells.
Other retinal neurons include photoreceptor cells, bipolar cells, amacrine cells, and retinal ganglion cells.
Structure
Depending on the species, there are typically one or two classes of horizontal cells, with a third type sometimes proposed.
Horizontal cells span across photoreceptors and summate inputs before synapsing onto photoreceptor cells. Horizontal cells may also synapse onto bipolar cells, but this remains uncertain.
There is a greater density of horizontal cells towards the central region of the retina. In the cat, it is observed that A-type horizontal cells have a density of
225 cells/mm2 near the center of the retina and a density of 120 cells/mm2 in more peripheral retina.
Horizontal cells and other retinal interneuron cells are less likely to be near neighbours of the same subtype than would occur by chance, resulting in ‘exclusion zones’ that separate t
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https://en.wikipedia.org/wiki/APX
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In computational complexity theory, the class APX (an abbreviation of "approximable") is the set of NP optimization problems that allow polynomial-time approximation algorithms with approximation ratio bounded by a constant (or constant-factor approximation algorithms for short). In simple terms, problems in this class have efficient algorithms that can find an answer within some fixed multiplicative factor of the optimal answer.
An approximation algorithm is called an -approximation algorithm for input size if it can be proven that the solution that the algorithm finds is at most a multiplicative factor of times worse than the optimal solution. Here, is called the approximation ratio. Problems in APX are those with algorithms for which the approximation ratio is a constant . The approximation ratio is conventionally stated greater than 1. In the case of minimization problems, is the found solution's score divided by the optimum solution's score, while for maximization problems the reverse is the case. For maximization problems, where an inferior solution has a smaller score, is sometimes stated as less than 1; in such cases, the reciprocal of is the ratio of the score of the found solution to the score of the optimum solution.
A problem is said to have a polynomial-time approximation scheme (PTAS) if for every multiplicative factor of the optimum worse than 1 there is a polynomial-time algorithm to solve the problem to within that factor. Unless P = NP there exist p
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https://en.wikipedia.org/wiki/KIR
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KIR, Kir or kir may refer to:
Biology
Inward-rectifier potassium channel Kir
Killer-cell immunoglobulin-like receptor, a receptor protein expressed on the surface of natural killer cells and some T-cells
Bodies of water
Kir (river), in northern Albania
Kir Lake, near Dijon, France
People
Kir Fard, Armenian nobleman of the 12th–13th centuries
Kir Nesis (1934–2003), Russian biologist
Kir Bulychev, Russian writer
Félix Kir (1876–1968), priest in the French Resistance
Kir, a character in Detective Conan
Places
Republic of Kiribati in the central Pacific (ISO code: KIR)
Kir of Moab, biblical stronghold
Land of Kir, biblical location
Transport
Katihar Junction railway station, Bihar; station code KIR
Kerry Airport, Ireland (IATA code: KIR)
Kirkby railway station, Merseyside, England; National Rail station code KIR
Other
Kir (cocktail), alcoholic beverage
Kyrgyz language (ISO code: kir)
Krajowa Izba Rozliczeniowa, an automated clearing house in Poland
See also
Kirs (disambiguation)
Kyr
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https://en.wikipedia.org/wiki/Vapor%20pressures%20of%20the%20elements%20%28data%20page%29
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Vapor pressure
Notes
Values are given in terms of temperature necessary to reach the specified pressure.
Valid results within the quoted ranges from most equations are included in the table for comparison.
A conversion factor is included into the original first coefficients of the equations to provide the pressure in pascals (CR2: 5.006, SMI: -0.875).
Ref. SMI uses temperature scale ITS-48. No conversion was done, which should be of little consequence however.
The temperature at standard pressure should be equal to the normal boiling point, but due to the considerable spread does not necessarily have to match values reported elsewhere.
log refers to log base 10
(T/K) refers to temperature in Kelvin (K)
(P/Pa) refers to pressure in Pascal (Pa)
References
CRC.a-m
David R. Lide (ed), CRC Handbook of Chemistry and Physics, 84th Edition. CRC Press. Boca Raton, Florida, 2003; Section 6, Fluid Properties; Vapor Pressure
Uncertainties of several degrees should generally be assumed. (e) Indicates extrapolated values beyond the region of experimental data, subject to greater uncertainty. (i) Indicates values calculated from ideal gas thermodynamic functions. (s) Indicates the substance is solid at this temperature. As quoted from these sources:
a - Lide, D.R., and Kehiaian, H.V., CRC Handbook of Thermophysical and Thermochemical Data, CRC Press, Boca Raton, Florida, 1994.
b - Stull, D., in American Institute of Physics Handbook, Third Edition, Gray, D.E., Ed., McGraw Hill, New Yo
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https://en.wikipedia.org/wiki/Frequency%20grid
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For telecommunications, a frequency grid is a table of all the central frequencies (and corresponding wavelengths) of channels allowed in a communications system.
The most common frequency grid used for fiber-optic communication is that used for channel spacing in Dense Wavelength Division Multiplexing (DWDM) at wavelengths around 1550 nm and defined by ITU-T G.694.1. The grid is defined relative to 193.1 THz and extends from 191.7 THz to 196.1 THz with 100 GHz spacing. While defined in frequency, the grid is often expressed in terms of wavelength, in which case it covers the wavelength range of 1528.77 nm to 1563.86 nm with approximately a 0.8 nm channel spacing.
For practical purposes, the grid has been extended to cover 186 THz to 201 THz and subdivided to provide 50 GHz and 25 GHz spaced grids.
References
External links
Complete ITU grid table for 100 Ghz spacing
International Standardization Activities on Optical Interfaces
Multiplexing
ITU-T recommendations
ITU-T G Series Recommendations
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https://en.wikipedia.org/wiki/Pulmonary%20surfactant
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Pulmonary surfactant is a surface-active complex of phospholipids and proteins formed by type II alveolar cells. The proteins and lipids that make up the surfactant have both hydrophilic and hydrophobic regions. By adsorbing to the air-water interface of alveoli, with hydrophilic head groups in the water and the hydrophobic tails facing towards the air, the main lipid component of surfactant, dipalmitoylphosphatidylcholine (DPPC), reduces surface tension.
As a medication, pulmonary surfactant is on the WHO Model List of Essential Medicines, the most important medications needed in a basic health system.
Function
To increase pulmonary compliance.
To prevent atelectasis (collapse of the alveoli or atriums) at the end of expiration.
To facilitate recruitment of collapsed airways.
Alveoli can be compared to gas in water, as the alveoli are wet and surround a central air space. The surface tension acts at the air-water interface and tends to make the bubble smaller (by decreasing the surface area of the interface). The gas pressure (P) needed to keep an equilibrium between the collapsing force of surface tension (γ) and the expanding force of gas in an alveolus of radius r is expressed by the Young–Laplace equation:
Compliance
Compliance is the ability of lungs and thorax to expand.
Lung compliance is defined as the volume change per unit of pressure change across the lung. Measurements of lung volume obtained during the controlled inflation/deflation of a normal lung sh
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https://en.wikipedia.org/wiki/G%20protein-gated%20ion%20channel
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G protein-gated ion channels are a family of transmembrane ion channels in neurons and atrial myocytes that are directly gated by G proteins.
Overview of mechanisms and function
Generally, G protein-gated ion channels are specific ion channels located in the plasma membrane of cells that are directly activated by a family of associated proteins. Ion channels allow for the selective movement of certain ions across the plasma membrane in cells. More specifically, in nerve cells, along with ion transporters, they are responsible for maintaining the electrochemical gradient across the cell.
G proteins are a family of intracellular proteins capable of mediating signal transduction pathways. Each G protein is a heterotrimer of three subunits: α-, β-, and γ- subunits. The α-subunit (Gα) typically binds the G protein to a transmembrane receptor protein known as a G protein-coupled receptor, or GPCR. This receptor protein has a large, extracellular binding domain which will bind its respective ligands (e.g. neurotransmitters and hormones). Once the ligand is bound to its receptor, a conformational change occurs. This conformational change in the G protein allows Gα to bind GTP. This leads to yet another conformational change in the G protein, resulting in the separation of the βγ-complex (Gβγ) from Gα. At this point, both Gα and Gβγ are active and able to continue the signal transduction pathway. Different classes of G protein-coupled receptors have many known functions i
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https://en.wikipedia.org/wiki/Tin%28II%29%20chloride
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Tin(II) chloride, also known as stannous chloride, is a white crystalline solid with the formula . It forms a stable dihydrate, but aqueous solutions tend to undergo hydrolysis, particularly if hot. SnCl2 is widely used as a reducing agent (in acid solution), and in electrolytic baths for tin-plating. Tin(II) chloride should not be confused with the other chloride of tin; tin(IV) chloride or stannic chloride (SnCl4).
Chemical structure
SnCl2 has a lone pair of electrons, such that the molecule in the gas phase is bent. In the solid state, crystalline SnCl2 forms chains linked via chloride bridges as shown. The dihydrate has three coordinates as well, with one water on the tin and another water on the first. The main part of the molecule stacks into double layers in the crystal lattice, with the "second" water sandwiched between the layers.
Chemical properties
Tin(II) chloride can dissolve in less than its own mass of water without apparent decomposition, but as the solution is diluted, hydrolysis occurs to form an insoluble basic salt:
SnCl2 (aq) + H2O (l) Sn(OH)Cl (s) + HCl (aq)
Therefore, if clear solutions of tin(II) chloride are to be used, it must be dissolved in hydrochloric acid (typically of the same or greater molarity as the stannous chloride) to maintain the equilibrium towards the left-hand side (using Le Chatelier's principle). Solutions of SnCl2 are also unstable towards oxidation by the air:
6 SnCl2 (aq) + O2 (g) + 2 H2O (l) → 2 SnCl4 (aq) + 4 Sn(OH)Cl (s)
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https://en.wikipedia.org/wiki/Crystallophone
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A crystallophone is a musical instrument that produces sound from glass.
One of the best known crystallophones is the glass harmonica, a set of rotating glass bowls which produce eerie, clear tones when rubbed with a wet finger. Musical glasses, the glass harp, were documented in Persia in the 14th century. The "ethereal" quality of instruments such as the glass harmonica exemplified the and for a while, "the instrument was extraordinarily popular...[but] About 1830 the instrument fell into oblivion."
The glasschord (or glasscord) resembles the celesta (a struck plaque idiophone operated by a keyboard) but uses keyboard-driven hammers to strike glass bars instead of metal bars.
The glass marimba is similar to the marimba (a stick percussion instrument with a keyboard layout), but has bars of glass instead of wood. The bars, which the performer strikes with padded sticks, are perched on a glass box to provide the necessary resonance.
A rare Thai instrument called (; literally "glass xylophone") has been used by the Thai music ensemble Fong Naam; it appears on their 1992 CD The Sleeping Angel: Thai Classical Music.
In popular culture
In Lydia Syson's biography, Doctor of Love: James Graham and his Celestial Bed, sexologist James Graham uses the glass harmonica for musical therapy purposes.
Benjamin Franklin was inspired to create his glass harmonica in 1763 after attending a recital performed on musical glasses in London in 1761.
See also
Lithophone
Verrophone
Refer
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https://en.wikipedia.org/wiki/Bortezomib
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Bortezomib, sold under the brand name Velcade among others, is an anti-cancer medication used to treat multiple myeloma and mantle cell lymphoma. This includes multiple myeloma in those who have and have not previously received treatment. It is generally used together with other medications. It is given by injection.
Common side effects include nausea, diarrhea, tiredness, low platelets, fever, numbness, low white blood cells, shortness of breath, rash and abdominal pain. Other severe side effects include low blood pressure, tumour lysis syndrome, heart failure, and reversible posterior leukoencephalopathy syndrome. It is in the class of medications known as proteasome inhibitor. It works by inhibiting proteasomes, cellular complexes that break down proteins.
Bortezomib was approved for medical use in the United States in 2003 and in the European Union in 2004. It is on the World Health Organization's List of Essential Medicines. It is available as a generic medication.
Medical use
Two open-label trials established the efficacy of bortezomib (with or without dexamethasone) on days 1,4,8, and 11 of a 21-day cycle for a maximum of eight cycles in heavily pretreated people with relapsed/refractory multiple myeloma. The phase III demonstrated the superiority of bortezomib over a high-dose dexamethasone regimen (e.g. median TTP 6.2 vs 3.5 months, and 1-year survival 80% vs 66%). New studies show that bortezomib may potentially help recover from vincristine treatment in treating
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https://en.wikipedia.org/wiki/Glasschord
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The glasschord (French: fortepiano à cordes de verre) is a struck crystallophone resembling the celesta, invented circa 1785 by physicist M. Beyer of Paris. It creates sound by using cloth covered wooden hammers to strike glass tubes laid on a cloth strip, with no dampeners. The instrument has a range of three octaves, in various models from c' to c'', f' to f'', and g' to g''. The instrument was largely inspired by the glass harmonica created by Benjamin Franklin, and was given the name glasschord by him. On 6 July 1785, Thomas Jefferson that Franklin carried a version of the instrument with him, describing it as a sticcado.
Beyer originally presented the instrument on 19 January 1785, in a presentation at the French Academy of Sciences, while the instrument still was nameless, with the instrument being publicised in the Journal de Paris multiple times through the same year.
Many glasschords were built by Chappell & Co., until around 1815.
The instrument was used in some scores, most notable by Hector Berlioz, who wrote the first version of La Tempête, and Camille Saint-Saëns who used the instrument in L'aquarium.
References
Keyboard instruments
Crystallophones
Stick percussion idiophones
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https://en.wikipedia.org/wiki/Likely
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Likely may refer to:
Probability
Likelihood function
Likely (surname)
Likely, British Columbia, Canada, a community
Likely, California, United States, a census-designated place
Likely McBrien (1892-1956), leading Australian rules football administrator in the Victorian Football League
In the nomenclature of political forecasting, a "likely" seat is one that is predicted, but not definitively, to probably be won by a particular political party
See also
Likely Airport (disambiguation)
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https://en.wikipedia.org/wiki/Ayya%20Vaikundar
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Ayya Vaikundar () also known as Siva Narayana or Vaikunda Swami was the founder of the Ayyavazhi faith. The Ayyavazhis believe him to be the first and foremost Purna avatar of Eka-Paran and the god Vishnu (Narayana). As per Ayyavazhi mythology detailed in their scriptures, Ayya Vaikundar incarnated in 1833, when he rose from the sea of Tiruchendur in the mortal shell of Vaikundar.
Ayya Vaikundar is a central character in the narratives and teaching of the Ayyavazhi scripture Akilathirattu Ammanai (Akilam). The Ayyayazhis believe that he will be instrumental in the destruction of Kali and establishment of Dharma Yukam. As per Ayyavazhi scriptures, Ayya Vaikundar is the supreme God in his own right.
Most of the preachings and activities found in Akilam and other texts about the life of Ayya Vaikundar was documented historically and detailed in critical contemporary sources externally as well. Though the prime features of Ayya Vaikundar’s mission is revealed through Akilathirattu, he also teaches orally. His oral teaching are compiled in the Books of Pathiram, Sivakanta Athikara Pathiram and Thingal Patham. Though Akilam is directly against creating any form of organised religion or belief, the teachings of Akilam and especially few books of Arul Nool form the basis of Ayyavazhi belief. The birth anniversary of Ayya Vaikundar is celebrated as Ayya Vaikunda Avataram on the 20th of Masi as per the Tamil Calendar (3 or 4 March C.E).
Background
In 1809, a baby born (lit. "Vishnu
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https://en.wikipedia.org/wiki/Special%20Edna
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Special Edna is the seventh episode of the fourteenth season of the American animated television series The Simpsons. It originally aired on the Fox network in the United States on January 5, 2003. In the episode, Edna Krabappel begins to lose faith in her relationship with Principal Skinner and becomes depressed. Bart, wanting to raise her spirits, decides to nominate her for the Teacher of the Year Award. Edna and the Simpsons are flown to Orlando, Florida, for the event.
Plot
Edna Krabappel tells her students to write a paper on World War I, due in three weeks. After class, Edna and Principal Skinner's apple picking date is cancelled when Skinner's mother, Agnes, interrupts. Bart continuously gets distracted from writing his paper by pranks and other activities, and at the end of the three weeks, he still has not started the assignment. The day before the date of submission, he asks Grampa for help, relying on his recount of World War I. Edna rejects Bart's paper for using six pages of ads as filler and tells him that he will have to do it correctly after school. As Bart finishes the assignment after school, supervised by Edna herself, he observes Skinner cancel a movie date with Edna when Agnes calls. Bart consoles Edna, and she reluctantly accepts his offer to accompany her to a documentary at the movie theater.
At home, Lisa suggests that Bart nominate Edna for the Teacher of the Year Award. When Edna is informed of her Teacher of the Year nomination, she thanks Bart
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https://en.wikipedia.org/wiki/Tight%20junction
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Tight junctions, also known as occluding junctions or zonulae occludentes (singular, zonula occludens), are multiprotein junctional complexes whose canonical function is to prevent leakage of solutes and water and seals between the epithelial cells. They also play a critical role maintaining the structure and permeability of endothelial cells. Tight junctions may also serve as leaky pathways by forming selective channels for small cations, anions, or water. The corresponding junctions that occur in invertebrates are septate junctions.
Structure
Tight junctions are composed of a branching network of sealing strands, each strand acting independently from the others. Therefore, the efficiency of the junction in preventing ion passage increases exponentially with the number of strands.
Each strand is formed from a row of transmembrane proteins embedded in both plasma membranes, with extracellular domains joining one another directly. There are at least 40 different proteins composing the tight junctions. These proteins consist of both transmembrane and cytoplasmic proteins. The three major transmembrane proteins are occludin, claudins, and junction adhesion molecule (JAM) proteins. These associate with different peripheral membrane proteins such as ZO-1 located on the intracellular side of plasma membrane, which anchor the strands to the actin component of the cytoskeleton. Thus, tight junctions join together the cytoskeletons of adjacent cells.
Transmembrane proteins:
Occ
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https://en.wikipedia.org/wiki/Kremersite
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Kremersite is a rare mineral which is a hydrated multiple chloride of iron, ammonium and potassium with the formula: (NH4,K)2FeCl5·H2O. Kremersite is a brown-red to orange mineral that crystallizes in the orthorhombic system. It is a water-soluble mineral that is found around volcanic fumaroles. Occurs at Vesuvius, Italy and Mount Etna, Sicily. It was discovered in 1853 and named for the German chemist, Peter Kremers (born 1827).
References
Mindat
Webmineral
Potassium minerals
Halide minerals
Iron(III) minerals
Orthorhombic minerals
Minerals in space group 62
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https://en.wikipedia.org/wiki/Polybrominated%20biphenyl
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Polybrominated biphenyls (PBBs), also called brominated biphenyls or polybromobiphenyls, are a group of manufactured chemicals that consist of polyhalogenated derivatives of a biphenyl core. Their chlorine analogs are the PCBs. While once widely used commercially, PBBs are now controlled substances under the Restriction of Hazardous Substances Directive, which limits their use in electrical and electronic products sold in the EU.
Characteristics
PBBs usually exist as colorless to off-white solids. PBBs soften at 72 degrees Celsius and decompose above 300 degrees Celsius. They have low vapor pressure, are very soluble in benzene and toluene, and insoluble in water. They are degraded by UV light.
Application
PBBs are used as flame retardants of the brominated flame retardant group. They are added to plastics used in products such as home electrical appliances, textiles, plastic foams, laptop cabinets, etc. to make them difficult to burn.
A number of substituted PBBs found application in medicine, namely bromophene and bromofenofos.
Health hazards
Exposure to the coplanar stereoisomer 3,3',4,4',5,5'-hexabromobiphenyl (but not the non-coplanar stereoisomer) in genetically susceptible mice is known to cause immunotoxicity and disorders related to the central nervous system, and even at doses as low as 2.5 mg/kg, excess neonatal fatalities are observed (LD50 is from 5–10 mg/kg). The mechanism of toxicity is cellular oxidative stress by aryl hydrocarbon receptor activation.
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https://en.wikipedia.org/wiki/Bernard%20Koopman
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Bernard Osgood Koopman (January 19, 1900 – August 18, 1981) was a French-born American mathematician, known for his work in ergodic theory, the foundations of probability, statistical theory and operations research.
Education and work
After living in France and Italy, Koopman emigrated to the United States in 1915. Koopman was a student of George David Birkhoff and his initial work concentrated on dynamical systems and mathematical physics.
In 1931/1932, Koopman and John von Neumann proposed a Hilbert space formulation of classical mechanics, known as the Koopman–von Neumann classical mechanics.
During World War II, he joined the Anti-Submarine Warfare Operations Research Group (ASWORG, later ORG) in Washington, D.C., directed by Philip M. Morse, to work for the U.S. Navy. The work of Koopman and his colleagues at ASWORG concerned the development of techniques for the US Navy to hunt U-boats. The theoretical work laid the foundations for search theory which subsequently became a field of its own within operations research. Their results remained classified Confidential for many years after the war; after 1955 Koopman set out to publish three articles on easily declassifiable portions of the work in the Journal of the Operations Research Society of America. He wrote down the results in detailed form in the book Search and Screening which was declassified in 1958. A large part of his work is a systematization of the work performed by his group at ASWORG; the portions on opt
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https://en.wikipedia.org/wiki/Crystal%20Hunt
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Crystal Clarese Hunt (born February 5, 1985) is an American actress and producer. She is known for playing Lizzie Spaulding on the CBS soap opera Guiding Light (2003–06) and Stacy Morasco on the ABC soap opera One Life to Live (2009–10, 2012).
Life and career
Hunt was born in Clearwater, Florida. She started her career as a child performer, notable appearing the film Problem Child 2 (1991). Hunt has starred in many commercials, including one for The Walt Disney Company's 25th anniversary celebration and an anti-drug advertisement with *NSYNC. In 2003, she was cast as Lizzie Spaulding, the troubled daughter of the long-suffering couple Philip and Beth Raines, on the CBS soap opera Guiding Light, which she played from 2003 to 2006. She received a Daytime Emmy Award nomination in 2005 for Outstanding Younger Actress in a Drama Series for the role.
Hunt appeared in the 2005 film The Derby Stallion, and appeared in the 2007 Universal Pictures film Sydney White as Demetria "Dinky" Rosemead Hodgekiss. She joined ABC soap opera One Life to Live in February 2009, playing Stacy Morasco. She left the show on February 16, 2010. She returned to the show as the ghostly Stacy in March 2010, and in Clint Buchanan's vision of Hell in January 2012.
Hunt starred in the 2015 reality series Queens of Drama, and later in the Pureflix soap opera, Hilton Head Island. In 2019, she starred, created and produced web-series Mood Swings.
Filmography
Film
Television
References
External links
Cryst
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https://en.wikipedia.org/wiki/Nanodomain
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A nanodomain is a nanometer-sized cluster of proteins found in a cell membrane. They are associated with the signal which occurs when a single calcium ion channel opens on a cell membrane, allowing an influx of calcium ions (Ca) which extend in a plume a few tens of nanometres from the channel pore. In a nanodomain, the coupling distance, that is, the distance between the calcium-binding proteins which sense the calcium, and the calcium channel, is very small, less than , which allows rapid signalling. The formation of a nanodomain signal is virtually instantaneous following the opening of the calcium channel, as calcium ions move rapidly into the cell along a steep concentration gradient. The nanodomain signal collapses just as quickly when the calcium channel closes, as the ions rapidly diffuse away from the pore. Formation of a nanodomain signal requires the influx of only approximately 1000 calcium ions.
Coupling distances greater than , mediated by a larger number of channels, are referred to as microdomains. nanodomain
Properties
Nanodomain signals are thought to improve the temporal precision of fast exocytosis of vesicles due to two specific properties:
The peak concentration of calcium ions will be reached incredibly quick (within a microsecond) and maintained as long as the channel is open.
Closure of the channel leads to a rapid collapse of the domain due to lateral diffusion away from the pore (the site of entry). The lateral diffusion of microdomains additi
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https://en.wikipedia.org/wiki/Lexical%20diffusion
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Lexical diffusion is the hypothesis that a sound change is an abrupt change that spreads gradually across the words in a language to which it is applicable.
It contrasts with the Neogrammarian view that a sound change results from phonetically-conditioned articulatory drift acting uniformly on all applicable words, which implies that sound changes are regular, with exceptions attributed to analogy and dialect borrowing.
Similar views were expressed by Romance dialectologists in the late 19th century but were reformulated and renamed by William Wang and coworkers studying varieties of Chinese in the 1960s and the 1970s.
William Labov found evidence for both processes but argued that they operate at different levels.
Neogrammarians
A key assumption of historical linguistics is that sound change is regular. The principle was summarized by the Neogrammarians in the late 19th century in the slogan "sound laws suffer no exceptions" and forms the basis of the comparative method of reconstruction and the tree model of linguistic evolution.
Inspired by the Uniformitarian Principle of geology, Neogrammarians such as Hermann Paul described regularity as a consequence of the operation of sound change as an imperceptible articulatory drift conditioned by the phonetic environment. Leonard Bloomfield later summarized this view:
He summarized the mechanism as "phonemes change".
Despite the unequivocal form in which these slogans are often quoted, the Neogrammarians admitted two exceptio
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https://en.wikipedia.org/wiki/British%20Rail%20Class%2043%20%28HST%29
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The British Rail Class 43 (HST) is the TOPS classification used for the InterCity 125 High Speed Train (formerly Classes 253 and 254) diesel-electric power cars, built by British Rail Engineering Limited from 1975 to 1982, and in service in the UK since 1976.
The class is officially the fastest diesel locomotive in the world, with an absolute maximum speed of , and a regular service speed of . The record run was led by 43102 (43302) and trailed by 43159.
History and background
In the early 1970s, the British Railways Board made the decision to replace its main-line express diesel traction. Financial limitations were tight, so mass electrification was not possible. As a result, a new generation of high-speed diesel trains had to be developed.
Experience with the high-speed Class 55 Deltic locomotives had shown that a low axle weight was essential to avoid damage to the track at sustained high speed, and that high-speed engines were the only way to provide a good enough power-to-weight ratio for diesels. To power the HST at up to , each power car had a new diesel engine, the 12-cylinder Paxman Valenta, running at 1,500rpm and developing . The 70-tonne weight of the power car gave it a 17.5-tonne axle loading.
Development and design
Prototype
The prototype set was developed at the Railway Technical Centre, Derby, the power cars having been constructed by British Rail Engineering Limited's (BREL) Crewe Works and the British Rail Mark 3 passenger cars by BREL's Derby Litchur
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https://en.wikipedia.org/wiki/British%20Rail%20Class%2043%20%28Warship%20Class%29
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The British Rail Class 43 diesel-hydraulic locomotives were built by the North British Locomotive Company (NBL) from 1960 to 1962. They were numbered D833–D865.
Classification
The D800 series diesel-hydraulic 'Warship Class', of B-B wheel arrangement, was constructed by two different builders. Those locomotives built by British Railways at Swindon Works were originally numbered D800-D832 and D866-D870. They were allocated Class 42 under the 1968 classification system, while those built by the North British Locomotive Company (NBL) were originally numbered D833-D865 and allocated Class 43. Because of their early withdrawal dates, neither the Swindon- nor the NBL-built locomotives carried TOPS numbers. More detail on factors common to both types can be found in the article on the Swindon-built British Rail Class 42.
Mechanical details
The NBL-built D800s differed mechanically from the Swindon-built batch: the Swindon locomotives used Maybach engines connected to Mekydro hydraulic transmissions whereas the NBL-built examples used MAN engines and Voith transmissions. NBL had entered into an arrangement with the German company MAN AG in the early 1950s to market MAN's engine designs in the UK: NBL was anxious to enter the diesel locomotive market, especially once it became apparent that British Railways would be seeking large quantities of such locomotives when the "Modernisation Plan" was announced. MAN were equally keen to obtain a slice of the UK market for themselves.
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https://en.wikipedia.org/wiki/Alloxan
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Alloxan, sometimes referred to as alloxan hydrate, is the name of the organic compound with the formula OC(N(H)CO)2C(OH)2. It is classified as a derivative of pyrimidine. The anhydrous derivative OC(N(H)CO)2CO is also known, as well as a dimeric derivative. These are some of the earliest known organic compounds. They exhibit a variety of biological activities.
History and literature
The compound was discovered by Justus von Liebig and Friedrich Wöhler. It is one of the oldest named organic compounds. It was originally prepared in 1818 by Luigi Valentino Brugnatelli (1761-1818) and was named in 1838 by Wöhler and Liebig. The name "Alloxan" emerged from an amalgamation of the words "allantoin" and "Oxalsäure" (oxalic acid). The alloxan model of diabetes was first described in rabbits by Dunn, Sheehan and McLetchie in 1943. The name is derived from allantoin, a product of uric acid excreted by the fetus into the allantois, and oxaluric acid derived from oxalic acid and urea, found in urine.
Alloxan was used in the production of the purple dye murexide, discovered by Carl Wilhelm Scheele in 1776. Murexide is the product of the complex in-situ multistep reaction of alloxantin and gaseous ammonia. Murexide results from the condensation of the unisolated intermediate uramil with alloxan, liberated during the course of the reaction.
Scheele sourced uric acid from human calculi (such as kidney stones) and called the compound lithic acid. William Prout investigated the compoun
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https://en.wikipedia.org/wiki/Keikogi
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(, "practice", , "dress or "clothes"), also known as or , is a traditional uniform worn for training in Japanese martial arts and their derivatives. Emerging in the late 19th century, the was developed by judo founder Kanō Jigorō.
Origin
Japanese martial arts historian Dave Lowry speculates that Kanō derived the uniform's design from the uniforms of Japanese firefighters' heavy hemp jackets, . By 1920, the as it exists today was worn by Kanō's students for judo practice; a photo displayed in the Kodokan (judo headquarters) taken in 1920 shows Kanō himself wearing a modern .
Until the 1920s, Okinawan karate practice was usually performed in everyday clothes. Given the social climate between the Japanese and Okinawans during this time, karate was seen as brutish compared to Japanese martial arts, which had their roots in samurai culture, such as jujutsu. To help market karate to the Japanese, Gichin Funakoshi – the founder of Shotokan karate and the instructor responsible for importing karate to mainland Japan – adopted a uniform style similar to Kanō's design.
Construction
Over time, karate practitioners modified the for karate by lightening the weave of the fabric, and adding strings to the inside of the jacket, tied to keep the jacket closed. The jacket is also held closed by a belt or .
The top part of the is called the . The trousers of the are called , or .
In modern times, white, black, blue and indigo are the most common colours of . In competitive judo, one
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https://en.wikipedia.org/wiki/Entropic%20force
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In physics, an entropic force acting in a system is an emergent phenomenon resulting from the entire system's statistical tendency to increase its entropy, rather than from a particular underlying force on the atomic scale.
Mathematical formulation
In the canonical ensemble, the entropic force associated to a macrostate partition is given by
where is the temperature, is the entropy associated to the macrostate , and is the present macrostate.
Examples
Pressure of an ideal gas
The internal energy of an ideal gas depends only on its temperature, and not on the volume of its containing box, so it is not an energy effect that tends to increase the volume of the box as gas pressure does. This implies that the pressure of an ideal gas has an entropic origin.
What is the origin of such an entropic force? The most general answer is that the effect of thermal fluctuations tends to bring a thermodynamic system toward a macroscopic state that corresponds to a maximum in the number of microscopic states (or micro-states) that are compatible with this macroscopic state. In other words, thermal fluctuations tend to bring a system toward its macroscopic state of maximum entropy.
Brownian motion
The entropic approach to Brownian movement was initially proposed by R. M. Neumann. Neumann derived the entropic force for a particle undergoing three-dimensional Brownian motion using the Boltzmann equation, denoting this force as a diffusional driving force or radial force. In
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https://en.wikipedia.org/wiki/Slobodna%20Dalmacija
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(, where Free is an adjective) is a Croatian daily newspaper published in Split.
The first issue of was published on 17 June 1943 by Tito's Partisans in an abandoned stone barn on Mosor, a mountain near Split, while the city was occupied by the Italian army. The paper was later published in various locations until Split was liberated on 26 October 1944. From the following day onward, has been published in Split.
Although it was originally viewed as a strictly Dalmatian regional newspaper, during the following decades , grew into one of the largest and most widely read daily newspapers of Yugoslavia, with its circulation reaching a zenith in the late 1980s. owed much of that success to its humour section. Many of the most popular Croatian humourists, like Miljenko Smoje, Đermano Ćićo Senjanović and the trio that later founded the Feral Tribune, began their careers there.
Another reason for this success was the editorial policy of Joško Kulušić, who used the decline of Communism to allow the paper to become a forum for new political ideas. In the early 1990s established a reputation as the newspaper with the most politically diverse group of columnists - from the extreme left to the extreme right.
In 1992, the government initiated proceedings against the paper, which would ultimately result in one of the most notorious scandals in recent Croatian history. was privatised, which resulted in Miroslav Kutle, a Zagreb businessman, becoming the new owner. After a brief at
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https://en.wikipedia.org/wiki/Shell%20theorem
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In classical mechanics, the shell theorem gives gravitational simplifications that can be applied to objects inside or outside a spherically symmetrical body. This theorem has particular application to astronomy.
Isaac Newton proved the shell theorem and stated that:
A spherically symmetric body affects external objects gravitationally as though all of its mass were concentrated at a point at its center.
If the body is a spherically symmetric shell (i.e., a hollow ball), no net gravitational force is exerted by the shell on any object inside, regardless of the object's location within the shell.
A corollary is that inside a solid sphere of constant density, the gravitational force within the object varies linearly with distance from the center, becoming zero by symmetry at the center of mass. This can be seen as follows: take a point within such a sphere, at a distance from the center of the sphere. Then you can ignore all of the shells of greater radius, according to the shell theorem (2). But the point can be considered to be external to the remaining sphere of radius r, and according to (1) all of the mass of this sphere can be considered to be concentrated at its centre. The remaining mass is proportional to (because it is based on volume). The gravitational force exerted on a body at radius r will be proportional to (the inverse square law), so the overall gravitational effect is proportional to so is linear in
These results were important to Newton's analysis
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https://en.wikipedia.org/wiki/Hyperbolic%20secant%20distribution
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In probability theory and statistics, the hyperbolic secant distribution is a continuous probability distribution whose probability density function and characteristic function are proportional to the hyperbolic secant function. The hyperbolic secant function is equivalent to the reciprocal hyperbolic cosine, and thus this distribution is also called the inverse-cosh distribution.
Generalisation of the distribution gives rise to the Meixner distribution, also known as the Natural Exponential Family - Generalised Hyperbolic Secant or NEF-GHS distribution.
Definitions
Probability density function
A random variable follows a hyperbolic secant distribution if its probability density function can be related to the following standard form of density function by a location and shift transformation:
where "sech" denotes the hyperbolic secant function.
Cumulative distribution function
The cumulative distribution function (cdf) of the standard distribution is a scaled and shifted version of the Gudermannian function,
where "arctan" is the inverse (circular) tangent function.
Johnson et al. (1995) places this distribution in the context of a class of generalized forms of the logistic distribution, but use a different parameterisation of the standard distribution compared to that here. Ding (2014) shows three occurrences of the Hyperbolic secant distribution in statistical modeling and inference.
Properties
The hyperbolic secant distribution shares many properties with the
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https://en.wikipedia.org/wiki/History%20of%20IFK%20G%C3%B6teborg
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Idrottsföreningen Kamraterna Göteborg, officially IFK Göteborg Fotboll, commonly known as IFK Göteborg, is a Swedish professional football club based in Gothenburg IFK Göteborg (sports club).
1895–1904
The first IFK association in Gothenburg was founded in 1895, with Oscar Lagerstedt as chairman. It was short-lived, although it has been confirmed that it founded a small-bore rifle shooting challenge prize in the winter of 1896. The next attempt to found an IFK club in Gothenburg was made on 5 September 1897, when two brothers named Friman, Eric Clase and Anton Johansson reconstructed the club. The club was active until at least 1899, but after that no information can be found that confirms the club still existed. During those years, the main activity was athletics, and for a short time in 1899, four-time Olympic gold medalist Eric Flemming was active in the club.
There was no further activity of any IFK association in Gothenburg between 1900 and 1904. The present-day IFK Göteborg was founded when Arthur "Lång-Arthur" Andersson, John Säwström, and two students at Chalmers University of Technology, Arthur Wingren and Sven Ljunggren, wanted to start an IFK club in Gothenburg. The idea came to their minds after reading a news-item which expressed confusion as to why the second largest city in Sweden still did not have an IFK association. Late in the evening of 2 October 1904, it was decided to start the club, and two days later on 4 October, IFK Göteborg became the 39th IFK a
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https://en.wikipedia.org/wiki/Incoherent%20scatter
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Incoherent scattering is a type of scattering phenomenon in physics. The term is most commonly used when referring to the scattering of an electromagnetic wave (usually light or radio frequency) by random fluctuations in a gas of particles (most often electrons).
The most well known practical application is known as incoherent scatter radar theory, a ground-based technique for studying the Earth's ionosphere first proposed by Professor William E. Gordon in 1958. A radar beam scattering off electrons in the ionospheric plasma creates an incoherent scatter return. When an electromagnetic wave is transmitted through the atmosphere, each of the electrons in the ionospheric plasma essentially acts as an antenna excited by the incoming wave, and the wave is re-radiated from the electron. Since the electrons are all moving at varying speeds as a result of ionospheric dynamics and random thermal motion, the reflection from each electron is also Doppler shifted. The receiver on the ground then receives a signal composed of the superposition of the re-radiated waves from all the electrons in the path of the incoming wave.
Since the positively-charged ions also present in the ionosphere are orders of magnitude more massive, they are not as readily excited by the incoming electromagnetic wave in the way that the electrons are, so they do not re-radiate the signal. However, the electrons tend to remain close to the positively-charged ions. As a result, the distribution function of t
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https://en.wikipedia.org/wiki/Stentz
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Stentz may refer to:
Zack Stentz, one of the scriptwriters of 2003 film Agent Cody Banks
Stentz is an official codename for Fedora Core release 4
Stentz's Algorithm
German-language surnames
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https://en.wikipedia.org/wiki/Fas%20ligand
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Fas ligand (FasL or CD95L or CD178) is a type-II transmembrane protein expressed on cytotoxic T lymphocytes and natural killer (NK) cells. Its binding with Fas receptor (FasR) induces programmed cell death in the FasR-carrying target cell. Fas ligand/receptor interactions play an important role in the regulation of the immune system and the progression of cancer.
Structure
Fas ligand or FasL is a homotrimeric type II transmembrane protein that belongs to the tumor necrosis factor (TNF) family. It signals through trimerization of FasR, which spans the membrane of the target cell. This trimerization usually leads to apoptosis, or programmed cell death.
Soluble Fas ligand is generated by cleaving membrane-bound FasL at a conserved cleavage site by the external matrix metalloproteinase MMP-7.
Receptors
FasR: The Fas receptor (FasR), or CD95, is the most intensely studied member of the death receptor family. The gene is situated on chromosome 10 in humans and 19 in mice. Previous reports have identified as many as eight splice variants, which are translated into seven isoforms of the protein. Many of these isoforms are rare haplotypes that are usually associated with a state of disease. Apoptosis-inducing Fas receptor is dubbed isoform 1 and is a type 1 transmembrane protein. It consists of three cysteine-rich pseudorepeats, a transmembrane domain, and an intracellular death domain.
DcR3: Decoy receptor 3 (DcR3) is a recently discovered decoy receptor of the tumor necrosis
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https://en.wikipedia.org/wiki/Substrate-level%20phosphorylation
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Substrate-level phosphorylation is a metabolism reaction that results in the production of ATP or GTP supported by the energy released from another high-energy bond that leads to phosphorylation of ADP or GDP to ATP or GTP (note that the reaction catalyzed by creatine kinase is not considered as "substrate-level phosphorylation"). This process uses some of the released chemical energy, the Gibbs free energy, to transfer a phosphoryl (PO3) group to ADP or GDP. Occurs in glycolysis and in the citric acid cycle.
Unlike oxidative phosphorylation, oxidation and phosphorylation are not coupled in the process of substrate-level phosphorylation, and reactive intermediates are most often gained in the course of oxidation processes in catabolism. Most ATP is generated by oxidative phosphorylation in aerobic or anaerobic respiration while substrate-level phosphorylation provides a quicker, less efficient source of ATP, independent of external electron acceptors. This is the case in human erythrocytes, which have no mitochondria, and in oxygen-depleted muscle.
Overview
Adenosine triphosphate (ATP) is a major "energy currency" of the cell. The high energy bonds between the phosphate groups can be broken to power a variety of reactions used in all aspects of cell function.
Substrate-level phosphorylation occurs in the cytoplasm of cells during glycolysis and in mitochondria either during the Krebs cycle or by MTHFD1L (EC 6.3.4.3), an enzyme interconverting ADP + phosphate + 10-formyltet
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https://en.wikipedia.org/wiki/Vivid
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Vivid may refer to:
Music
Vivid (band), a Japanese rock band
"Vivid" (song), by Electronic, 1999
"ViViD", a 2016 song by Loona from HeeJin
Albums
Vivid (Vivian Green album), 2015
Vivid (Crystal Kay album), 2012
Vivid (Living Colour album), 1988
Vivid (Ailee album), 2015
Vivid (KM-MARKIT album), 2005
Vivid: Kissing You, Sparkling, Joyful Smile, a 2008 mini-album by BoA
Organizations
Vivid Entertainment, a company that produces and distributes adult media
Vivid Image, a defunct UK video game developer
Vivid Imaginations, a UK toy company
Vivid Seats, a ticket exchange company
Technology
HTC Vivid, a mobile phone
Vivid Vervet, the code name for version 15.04 of the Ubuntu Linux distribution
Festivals and arts
Vivid (arts centre), a media art centre in Birmingham, England
Vivid Sydney, an outdoor festival in Sydney, Australia
Vivid Live, a contemporary music festival held by Sydney Opera House in Australia
Other uses
Vivid, a brand of bleach produced by Reckitt Benckiser
Vivid, a fictional all-female group in Hatsune Miku: Colorful Stage! that make up one half of Vivid BAD SQUAD
Magical Girl Lyrical Nanoha ViVid, a 2009 manga in the Magical Girl Lyrical Nanoha series
HMS Vivid
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https://en.wikipedia.org/wiki/CIUT-FM
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CIUT-FM is a campus and community radio station operating out of the University of Toronto. The station broadcasts live and continuously from Toronto on the 89.5 FM frequency. Programming can also be heard nationally via channel 826 on Shaw Direct, and over the internet via the CIUT website. The station is financially supported by donations and an undergraduate student levy. CIUT-FM also broadcasts a Punjabi and Urdu language station, Sur Sagar Radio on a Subsidiary Communications Multiplex Operation frequency.
CIUT's studios are located on Tower Road on the University of Toronto campus, while its transmitter is located atop First Canadian Place in Toronto's Financial District.
History
The station began as a closed-circuit broadcaster called Radio Varsity in 1966, later becoming Input Radio, UTR and then CJUT. All these versions of the station were only heard within the confines of the University of Toronto, thanks to an extensive network of loudspeakers, amplifiers, and cables strung through the extensive underground network of steam tunnels beneath the University's St. George campus. The station was granted a broadcast license and became CIUT-FM in 1986, and on January 15, 1987, the station's FM broadcasts began to reach a considerably wider range across southern Ontario.
In 1999, CIUT was $150,000 in debt resulting in the student union taking over management, firing two employees, dismissing five volunteers, shortening time slots for other programs and selling late-n
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https://en.wikipedia.org/wiki/Hellmann%E2%80%93Feynman%20theorem
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In quantum mechanics, the Hellmann–Feynman theorem relates the derivative of the total energy with respect to a parameter to the expectation value of the derivative of the Hamiltonian with respect to that same parameter. According to the theorem, once the spatial distribution of the electrons has been determined by solving the Schrödinger equation, all the forces in the system can be calculated using classical electrostatics.
The theorem has been proven independently by many authors, including Paul Güttinger (1932), Wolfgang Pauli (1933), Hans Hellmann (1937) and Richard Feynman (1939).
The theorem states
where
is a Hermitian operator depending upon a continuous parameter ,
, is an eigenstate (eigenfunction) of the Hamiltonian, depending implicitly upon ,
is the energy (eigenvalue) of the state , i.e. .
Note that there is a breakdown of the Hellmann-Feynman theorem close to quantum critical points in the thermodynamic limit.
Proof
This proof of the Hellmann–Feynman theorem requires that the wave function be an eigenfunction of the Hamiltonian under consideration; however, it is also possible to prove more generally that the theorem holds for non-eigenfunction wave functions which are stationary (partial derivative is zero) for all relevant variables (such as orbital rotations). The Hartree–Fock wavefunction is an important example of an approximate eigenfunction that still satisfies the Hellmann–Feynman theorem. Notable example of where the Hellmann–Feynman is not ap
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https://en.wikipedia.org/wiki/Weber%20number
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The Weber number (We) is a dimensionless number in fluid mechanics that is often useful in analysing fluid flows where there is an interface between two different fluids, especially for multiphase flows with strongly curved surfaces. It is named after Moritz Weber (1871–1951). It can be thought of as a measure of the relative importance of the fluid's inertia compared to its surface tension. The quantity is useful in analyzing thin film flows and the formation of droplets and bubbles.
Mathematical expression
The Weber number may be written as:
where
is the drag coefficient of the body cross-section.
is the density of the fluid (kg/m3).
is its velocity (m/s).
is its characteristic length, typically the droplet diameter (m).
is the surface tension (N/m).
The modified Weber number,
equals the ratio of the kinetic energy on impact to the surface energy,
,
where
and
.
Applications
One application of the Weber number is the study of heat pipes. When the momentum flux in the vapor core of the heat pipe is high, there is a possibility that the shear stress exerted on the liquid in the wick can be large enough to entrain droplets into the vapor flow. The Weber number is the dimensionless parameter that determines the onset of this phenomenon called the entrainment limit (Weber number greater than or equal to 1). In this case the Weber number is defined as the ratio of the momentum in the vapor layer divided by the surface tension force restraining the liq
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https://en.wikipedia.org/wiki/Quantum%20compression
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Quantum compression may refer to:
Data compression as it relates to quantum computing
Quantum, one of several compression algorithms used by CAB
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https://en.wikipedia.org/wiki/Xanthinuria
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Xanthinuria, also known as xanthine oxidase deficiency, is a rare genetic disorder causing the accumulation of xanthine. It is caused by a deficiency of the enzyme xanthine oxidase.
It was first formally characterized in 1954.
Presentation
Affected people have unusually high concentrations of xanthine in their blood and urine, which can lead to health problems such as renal failure and xanthine kidney stones, one of the rarest types of kidney stones.
Causes
Type I xanthinuria can be caused by a deficiency of xanthine oxidase, which is an enzyme necessary for converting xanthine to uric acid. Type II xanthinuria and molybdenum cofactor deficiency lack one or two other enzyme activities in addition to xanthine oxidase.
Treatment
There is no specific treatment beyond maintaining a high fluid intake and avoiding foods that are high in purine.
References
External links
Inborn errors of purine-pyrimidine metabolism
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https://en.wikipedia.org/wiki/Diplosome
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In cell biology, a diplosome refers to the pair of centrioles which are arranged perpendicularly to one another located near the nucleus. The diplosome plays a role in many processes such as in primary cilium development, spermiogenesis of teleosts, and mitosis. The rigid arrangement of centrioles in a diplosome is generally established after the procentriole is formed during mitosis.
Role of Diplosome in Primary Cilia Development
Primary cilia develop from the diplosome. Although the mechanism is not defined, during prometaphase of mitosis the diplosome ungergoes many changes to allow cilium resorption to occur.
Role of Diplosome in Spermiogenesis of teleosts
The type of spermiogenesis the teleost will undergo is dependent on the location of the diplosome on the nucleus, which ultimately acts as the cause of where the flagellum will be. In type I spermiogenesis, the diplosome is located at a lateral position on the nucleus leading to a perpendicular flagellum to the nucleus. In type II spermiogenesis, the diplosome is located at the apical pole of the nucleus, creating a parallel flagellum to the nucleus. In both scenarios the diplosome will reach the nuclear fossa after nuclear roation.
Diplosome in Mitosis
Diplosomes first appear during G2 phase of the cell cycle. In the early stages of mitosis the diplosome will split and begin to move in opposite directions until both reach edges of the nucleus. At this point one diplosome will return to the center of the nucleus w
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https://en.wikipedia.org/wiki/Courant%E2%80%93Friedrichs%E2%80%93Lewy%20condition
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In mathematics, the convergence condition by Courant–Friedrichs–Lewy is a necessary condition for convergence while solving certain partial differential equations (usually hyperbolic PDEs) numerically. It arises in the numerical analysis of explicit time integration schemes, when these are used for the numerical solution. As a consequence, the time step must be less than a certain time in many explicit time-marching computer simulations, otherwise the simulation produces incorrect results. The condition is named after Richard Courant, Kurt Friedrichs, and Hans Lewy who described it in their 1928 paper.
Heuristic description
The principle behind the condition is that, for example, if a wave is moving across a discrete spatial grid and we want to compute its amplitude at discrete time steps of equal duration, then this duration must be less than the time for the wave to travel to adjacent grid points. As a corollary, when the grid point separation is reduced, the upper limit for the time step also decreases. In essence, the numerical domain of dependence of any point in space and time (as determined by initial conditions and the parameters of the approximation scheme) must include the analytical domain of dependence (wherein the initial conditions have an effect on the exact value of the solution at that point) to assure that the scheme can access the information required to form the solution.
Statement
To make a reasonably formally precise statement of the condition, it is n
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https://en.wikipedia.org/wiki/List%20of%20cities%20and%20towns%20in%20Kosovo
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This is a list of cities and towns in the Kosovo in alphabetical order categorised by municipality or district, according to the criteria used by the Kosovo Agency of Statistics (KAS). Kosovo's population is distributed in 1,467 settlements with 26 per cent of its population concentrated in 7 urban areas, also known as regional centers, consisting of Ferizaj, Gjakova, Gjilan, Mitrovica, Peja, Pristina and Prizren.
The cities and towns in Kosovo belong to the following size ranges in terms of the number of inhabitants:
1 city larger than 150,000: Pristina
2 cities from 50,000 to 100,000: Gjilan and Prizren
9 cities from 15,000 to 50,000: Ferizaj, Fushë Kosovë, Gjakova, Mitrovica, Peja, Podujeva, Rahovec, and Vushtrri
List
See also
Administrative divisions of Kosovo
List of populated places in Kosovo
List of populated places in Kosovo by Albanian name
References
Kosovo
Kosovo
Kosovo-related lists
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https://en.wikipedia.org/wiki/Jan%20Jansk%C3%BD
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Jan Janský () (3 April 1873 in Smíchov, now Prague – 8 September 1921 in Černošice, near Prague) was a Czech serologist, neurologist and psychiatrist. He is credited with the classification of blood into four types (I, II, III, IV).
Janský studied medicine at Charles University in Prague. From 1899, he worked in the Psychiatric Clinic in Prague. In 1914, he was named professor. During World War I Janský served two years as a doctor at the front until a heart attack disabled him. After the war he worked as a neuropsychiatrist in a military Hospital (Vojenská nemocnice). He had angina pectoralis and died of ischaemic heart disease.
Janský was also a proponent of voluntary blood donations.
Classification
Through his psychiatric research, Janský tried to find a correlation between mental diseases and blood diseases. He found no such correlation existed and published a study, Hematologická studie u psychotiků (1907, Hematological study of psychotics), in which he classified blood into four groups, I, II, III, and IV. (At the time, Janský was unaware of the work of Karl Landsteiner, whose discovery of the A, B, and O blood types earned him the Nobel Prize in Physiology or Medicine in 1930.) At the time Janský's discovery passed almost unnoticed. In 1921 an American medical commission acknowledged Janský's classification. A similar classification was described by William Lorenzo Moss, except the I and IV of Moss were the opposite to that of Janský's, leading to confusion in bloo
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https://en.wikipedia.org/wiki/Melezitose
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Melezitose, also spelled melicitose, is a nonreducing trisaccharide sugar that is produced by many plant sap eating insects, including aphids such as Cinara pilicornis, by an enzyme reaction. This is beneficial to the insects, as it reduces the stress of osmosis by reducing their own water potential. The melezitose is part of the honeydew which acts as an attractant for ants and also as a food for bees. This is useful to the aphids as they have a symbiotic relationship with ants. Melezitose can be partially hydrolyzed to glucose and turanose the latter of which is an isomer of sucrose.
References
Trisaccharides
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