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https://en.wikipedia.org/wiki/Octagram | In geometry, an octagram is an eight-angled star polygon.
The name octagram combine a Greek numeral prefix, octa-, with the Greek suffix -gram. The -gram suffix derives from γραμμή (grammḗ) meaning "line".
Detail
In general, an octagram is any self-intersecting octagon (8-sided polygon).
The regular octagram is la... |
https://en.wikipedia.org/wiki/Retransmission%20%28data%20networks%29 | Retransmission, essentially identical with automatic repeat request (ARQ), is the resending of packets which have been either damaged or lost. Retransmission is one of the basic mechanisms used by protocols operating over a packet switched computer network to provide reliable communication (such as that provided by a r... |
https://en.wikipedia.org/wiki/Mondrian%20OLAP%20server | Mondrian is an open source OLAP (online analytical processing) server, written in Java. It supports the MDX
(multidimensional expressions) query language and the XML for Analysis and olap4j interface specifications. It reads from SQL and other data sources and aggregates data in a memory cache.
Mondrian is used for:
... |
https://en.wikipedia.org/wiki/Godwin%20Plots | The Godwin Plots are one of the world's longest running science experiments. They can be found at Wicken Fen nature reserve, Cambridgeshire, England.
Five experimental areas of vegetation were established in the 1927 by Prof. Sir Harry Godwin. The first plot is never cut. The second is cut every four years, the next e... |
https://en.wikipedia.org/wiki/FORMAC |
FORMAC, the FORmula MAnipulation Compiler, was the first computer algebra system to have significant use. It was developed by Jean E. Sammet and her team, as an extension of FORTRAN IV. The compiler was implemented as a preprocessor taking the FORMAC program and converting it to a FORTRAN IV program which was in turn ... |
https://en.wikipedia.org/wiki/Java%20Modeling%20Language | The Java Modeling Language (JML) is a specification language for Java programs, using Hoare style pre- and postconditions and invariants, that follows the design by contract paradigm. Specifications are written as Java annotation comments to the source files, which hence can be compiled with any Java compiler.
Various... |
https://en.wikipedia.org/wiki/Community%20Z%20Tools | The Community Z Tools (CZT) initiative is based around a SourceForge project to build a set of tools for the Z notation, a formal method useful in software engineering. Tools include support for editing, typechecking and animating Z specifications. There is some support for extensions such as Object-Z and TCOZ. The too... |
https://en.wikipedia.org/wiki/Michael%20J.%20C.%20Gordon | Michael John Caldwell Gordon (28 February 1948 – 22 August 2017) was a British computer scientist.
Life
Mike Gordon was born in Ripon, Yorkshire, England. He attended Dartington Hall School and Bedales School. In 1966, he was accepted to study engineering at Gonville and Caius College, University of Cambridge, but tr... |
https://en.wikipedia.org/wiki/Bokosuka%20Wars | is a 1983 action-strategy role-playing video game developed by Kōji Sumii (住井浩司) and released by ASCII for the Sharp X1 computer, followed by ports to the MSX, FM-7, NEC PC-6001, NEC PC-8801 and NEC PC-9801 computer platforms, as well as an altered version released for the Family Computer console and later the Virtual ... |
https://en.wikipedia.org/wiki/Pulsed-field%20gel%20electrophoresis | Pulsed-field gel electrophoresis (PFGE) is a technique used for the separation of large DNA molecules by applying to a gel matrix an electric field that periodically changes direction. Pulsed-field gel electrophoresis is a method used to separate large segments of DNA using an alternating and cross field. In a uniform ... |
https://en.wikipedia.org/wiki/David%20May%20%28computer%20scientist%29 | Michael David May FRS FREng (born 24 February 1951) is a British computer scientist. He is a Professor in the Department of Computer Science at the University of Bristol and founder of XMOS Semiconductor, serving until February 2014 as the chief technology officer.
May was lead architect for the transputer. As of 2017... |
https://en.wikipedia.org/wiki/Pythagorean%20prime | A Pythagorean prime is a prime number of the Pythagorean primes are exactly the odd prime numbers that are the sum of two squares; this characterization is Fermat's theorem on sums of two squares.
Equivalently, by the Pythagorean theorem, they are the odd prime numbers for which is the length of the hypotenuse of a... |
https://en.wikipedia.org/wiki/Dulmage%E2%80%93Mendelsohn%20decomposition | In graph theory, the Dulmage–Mendelsohn decomposition is a partition of the vertices of a bipartite graph into subsets, with the property that two adjacent vertices belong to the same subset if and only if they are paired with each other in a perfect matching of the graph. It is named after A. L. Dulmage and Nathan Men... |
https://en.wikipedia.org/wiki/Primitive%20%28phylogenetics%29 | In phylogenetics, a primitive (or ancestral) character, trait, or feature of a lineage or taxon is one that is inherited from the common ancestor of a clade (or clade group) and has undergone little change since. Conversely, a trait that appears within the clade group (that is, is present in any subgroup within the cl... |
https://en.wikipedia.org/wiki/Fraser%20syndrome | Fraser syndrome (also known as Meyer-Schwickerath's syndrome, Fraser-François syndrome, or Ullrich-Feichtiger syndrome) is an autosomal recessive congenital disorder, identified by several developmental anomalies. Fraser syndrome is named for the geneticist George R. Fraser, who first described the syndrome in 1962.
S... |
https://en.wikipedia.org/wiki/Logopenic%20progressive%20aphasia | Logopenic progressive aphasia (LPA) is a variant of primary progressive aphasia. It is defined clinically by impairments in naming and sentence repetition. It is similar to conduction aphasia and is associated with atrophy to the left posterior temporal cortex and inferior parietal lobule. It is suspected that an atyp... |
https://en.wikipedia.org/wiki/Domainz | Domainz Limited was the original .nz registry operator and is now an ICANN accredited domain name registrar and web host.
IANA delegated the .nz namespace to John Houlker on 19 January 1987, and the University of Waikato issued .nz domain names and maintained the .nz registry during the early part of Internet availabi... |
https://en.wikipedia.org/wiki/Gordon%20Plotkin | Gordon David Plotkin, (born 9 September 1946) is a theoretical computer scientist in the School of Informatics at the University of Edinburgh. Plotkin is probably best known for his introduction of structural operational semantics (SOS) and his work on denotational semantics. In particular, his notes on A Structural A... |
https://en.wikipedia.org/wiki/Microsoft%20Windows%20SDK | Microsoft Windows SDK, and its predecessors Platform SDK, and .NET Framework SDK, are software development kits (SDKs) from Microsoft that contain documentation, header files, libraries, samples and tools required to develop applications for Microsoft Windows and .NET Framework. Platform SDK specializes in developing a... |
https://en.wikipedia.org/wiki/Enon%20%28robot%29 | Enon is a personal assistant robot first offered for sale in September 2005. Enon was developed by two companies: Fujitsu Frontech Limited and Fujitsu Laboratories Ltd. The six-million yen (US$60,000) rolling robot is self-guiding, with limited speech recognition and synthesis. Enon can amongst others be used to provid... |
https://en.wikipedia.org/wiki/BGP%20hijacking | BGP hijacking (sometimes referred to as prefix hijacking, route hijacking or IP hijacking) is the illegitimate takeover of groups of IP addresses by corrupting Internet routing tables maintained using the Border Gateway Protocol (BGP).
Background
The Internet is a global network in enabling any connected host, identi... |
https://en.wikipedia.org/wiki/Homeobox%20protein%20NANOG | Homeobox protein NANOG (hNanog) is a transcriptional factor that helps embryonic stem cells (ESCs) maintain pluripotency by suppressing cell determination factors. hNanog is encoded in humans by the NANOG gene. Several types of cancer are associated with NANOG.
Etymology
The name NANOG derives from Tír na nÓg (Irish ... |
https://en.wikipedia.org/wiki/IEEE%20Transactions%20on%20Software%20Engineering | The IEEE Transactions on Software Engineering is a monthly peer-reviewed scientific journal published by the IEEE Computer Society. It was established in 1975 and covers the area of software engineering. It is considered the leading journal in this field.
Abstracting and indexing
The journal is abstracted and indexed ... |
https://en.wikipedia.org/wiki/Floer%20homology | In mathematics, Floer homology is a tool for studying symplectic geometry and low-dimensional topology. Floer homology is a novel invariant that arises as an infinite-dimensional analogue of finite-dimensional Morse homology. Andreas Floer introduced the first version of Floer homology, now called Lagrangian Floer ho... |
https://en.wikipedia.org/wiki/Set%20Theory%3A%20An%20Introduction%20to%20Independence%20Proofs | Set Theory: An Introduction to Independence Proofs is a textbook and reference work in set theory by Kenneth Kunen. It starts from basic notions, including the ZFC axioms, and quickly develops combinatorial notions such as trees, Suslin's problem, ◊, and Martin's axiom. It develops some basic model theory (rather spec... |
https://en.wikipedia.org/wiki/Low-dropout%20regulator | A low-dropout regulator (LDO regulator) is a DC linear voltage regulator that can operate even when the supply voltage is very close to the output voltage.
The advantages of an LDO regulator over other DC-to-DC voltage regulators include: the absence of switching noise (in contrast to switching regulators); smaller dev... |
https://en.wikipedia.org/wiki/Ultraviolet%20fixed%20point | In a quantum field theory, one may calculate an effective or running coupling constant that defines the coupling of the theory measured at a given momentum scale. One example of such a coupling constant is the electric charge.
In approximate calculations in several quantum field theories, notably quantum electrodynami... |
https://en.wikipedia.org/wiki/Memoirs%20of%20an%20Invisible%20Man%20%28film%29 | Memoirs of an Invisible Man is a 1992 American comedy-drama film directed by John Carpenter and starring Chevy Chase, Daryl Hannah, Sam Neill, Michael McKean and Stephen Tobolowsky. The film is loosely based on Memoirs of an Invisible Man, a 1987 novel by H.F. Saint. According to screenwriter William Goldman's book Whi... |
https://en.wikipedia.org/wiki/Pod%20slurping | Pod slurping is the act of using a portable data storage device such as an iPod digital audio player to illicitly download large quantities of confidential data by directly plugging it into a computer where the data are held, and which may be on the inside of a firewall.
There has been some work in the development of ... |
https://en.wikipedia.org/wiki/Tinkerbell%20map | The Tinkerbell map is a discrete-time dynamical system given by:
Some commonly used values of a, b, c, and d are
Like all chaotic maps, the Tinkerbell Map has also been shown to have periods; after a certain number of mapping iterations any given point shown in the map to the right will find itself once again at its ... |
https://en.wikipedia.org/wiki/Quatrefoil | A quatrefoil (anciently caterfoil) is a decorative element consisting of a symmetrical shape which forms the overall outline of four partially overlapping circles of the same diameter. It is found in art, architecture, heraldry and traditional Christian symbolism. The word 'quatrefoil' means "four leaves", from the Lat... |
https://en.wikipedia.org/wiki/UTEC | UTEC (University of Toronto Electronic Computer Mark I) was a computer built at the University of Toronto (UofT) in the early 1950s. It was the first computer in Canada, one of the first working computers in the world, although only built in a prototype form while awaiting funding for expansion into a full-scale versio... |
https://en.wikipedia.org/wiki/Ecotoxicology | Ecotoxicology is the study of the effects of toxic chemicals on biological organisms, especially at the population, community, ecosystem, and biosphere levels. Ecotoxicology is a multidisciplinary field, which integrates toxicology and ecology.
The ultimate goal of ecotoxicology is to reveal and predict the effects of... |
https://en.wikipedia.org/wiki/Numeronym | A numeronym is a number-based word.
Anne H. Soukhanov, editor of the Microsoft Encarta College Dictionary, gives the original meaning of the term as "a telephone number that spells a word or a name" on a telephone dial/numpad.
A number may also denote how many times the character before or after it is repeated. This ... |
https://en.wikipedia.org/wiki/Linked%20numbering%20scheme | A linked numbering scheme (LNS) is a dialing procedure in effect in a service area within which call routing between adjacent exchanges does not require a dialing code. The term is only used in the United Kingdom, but not in the North American Numbering Plan.
United Kingdom
The largest linked numbering scheme in the U... |
https://en.wikipedia.org/wiki/Logics%20for%20computability | Logics for computability are formulations of logic which
capture some aspect of computability as a basic notion. This usually involves a mix
of special logical connectives as well as semantics which explains how the logic is to be interpreted in a computational way.
Probably the first formal treatment of logic for com... |
https://en.wikipedia.org/wiki/J%C3%B8rg%20Tofte%20Jebsen | Jørg Tofte Jebsen (27 April 1888 – 7 January 1922) was a physicist from Norway, where he was the first to work on Einstein's general theory of relativity. In this connection he became known after his early death for what many now call the Jebsen-Birkhoff theorem for the metric tensor outside a general, spherical mass ... |
https://en.wikipedia.org/wiki/Light%20Up%20%28puzzle%29 | Light Up (Japanese: 美術館 bijutsukan, art gallery), also called Akari (明かり, light) is a binary-determination logic puzzle published by Nikoli. As of 2011, three books consisting entirely of Light Up puzzles have been published by Nikoli.
Rules
Light Up is played on a rectangular grid of white and black cells. The play... |
https://en.wikipedia.org/wiki/State-universal%20coupled%20cluster | State-universal coupled cluster (SUCC) method is one of several multi-reference coupled-cluster (MR) generalizations of single-reference coupled cluster method. It was first formulated by Bogumił Jeziorski and Hendrik Monkhorst in their work published in Physical Review A in 1981. State-universal coupled cluster is oft... |
https://en.wikipedia.org/wiki/African%20Journal%20of%20AIDS%20Research | The African Journal of AIDS Research is a peer-reviewed medical journal published in 2002 by the National Inquiry Services Centre (Grahamstown, South Africa) on topics related related to understanding the social dimensions to AIDS in Africa. Launched to address the lack of an African-managed journal focussed on social-... |
https://en.wikipedia.org/wiki/Electrophoresis%20%28disambiguation%29 | Electrophoresis is the motion of dispersed particles relative to a fluid under the influence of a spatially uniform electric field.
"Electrophoresis" can also refer to:
Interface and colloid science
Dielectrophoresis, similar motion in a space non-uniform electric field
Microelectrophoresis, a method of studying elec... |
https://en.wikipedia.org/wiki/Extremal%20combinatorics | Extremal combinatorics is a field of combinatorics, which is itself a part of mathematics. Extremal combinatorics studies how large or how small a collection of finite objects (numbers, graphs, vectors, sets, etc.) can be, if it has to satisfy certain restrictions.
Much of extremal combinatorics concerns classes of se... |
https://en.wikipedia.org/wiki/Canid%20hybrid | Canid hybrids are the result of interbreeding between the species of the subfamily Caninae.
Genetic considerations
The wolf-like canids are a group of large carnivores that are genetically closely related because they all possess 78 chromosomes, arranged in 39 pairs and are karyologically indistinguishable from each o... |
https://en.wikipedia.org/wiki/Isotachophoresis | Isotachophoresis (ITP) is a technique in analytical chemistry used for selective separation and concentration of ionic analytes. It is a form of electrophoresis; charged analytes are separated based on ionic mobility, a quantity which tells how fast an ion migrates through an electric field.
Overview
In conventional I... |
https://en.wikipedia.org/wiki/Parapatric%20speciation | In parapatric speciation, two subpopulations of a species evolve reproductive isolation from one another while continuing to exchange genes. This mode of speciation has three distinguishing characteristics: 1) mating occurs non-randomly, 2) gene flow occurs unequally, and 3) populations exist in either continuous or di... |
https://en.wikipedia.org/wiki/Massey%20product | In algebraic topology, the Massey product is a cohomology operation of higher order introduced in , which generalizes the cup product. The Massey product was created by William S. Massey, an American algebraic topologist.
Massey triple product
Let be elements of the cohomology algebra of a differential graded algeb... |
https://en.wikipedia.org/wiki/ATM%20%28computer%29 | The ATM Turbo (ru: "АТМ-ТУРБО"), also known simply as ATM (from ru: "Ассоциация Творческой Молодёжи", meaning "Association of Creative Youth") is a ZX Spectrum clone, developed in Moscow in 1991, by two firms, MicroArt and ATM.
It offers enhanced characteristics, compared to the original Spectrum, such as a , RAM, R... |
https://en.wikipedia.org/wiki/Faddeev%20equations | The Faddeev equations, named after their inventor Ludvig Faddeev, are equations that describe, at once, all the possible exchanges/interactions in a system of three particles in a fully quantum mechanical formulation. They can be solved iteratively.
In general, Faddeev equations need as input a potential that describ... |
https://en.wikipedia.org/wiki/Elmer%20FEM%20solver | Elmer is a computational tool for multi-physics problems. It has been developed by CSC in collaboration with Finnish universities, research laboratories and industry. Elmer FEM solver is free and open-source software, subject to the requirements of the GNU General Public License (GPL), version 2 or any later.
Elmer in... |
https://en.wikipedia.org/wiki/Quantum%20register | In quantum computing, a quantum register is a system comprising multiple qubits. It is the quantum analogue of the classical processor register. Quantum computers perform calculations by manipulating qubits within a quantum register.
Definition
It is usually assumed that the register consists of qubits. It is also... |
https://en.wikipedia.org/wiki/Airhitch | Airhitch was a user-run system for hitchhiking on commercial airliners. It was started by Robert Segelbaum in 1969. People, who travel in this way, generally refer to themselves as Airhitchers. Most airhitchers fly between the United States and Western Europe. Before Airhitch migrated to internet based communication in... |
https://en.wikipedia.org/wiki/Dunbar%27s%20number | Dunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an individual knows who each person is and how each person relates to every other person.
This number was first proposed in the 1990s by British anthropologist Robin Dun... |
https://en.wikipedia.org/wiki/Biotech%20Sweden | Biotech Sweden was a Swedish tabloid magazine about and for the Scandinavian life science and biotech industry.
History and profile
Biotech Sweden was first published on 9 April 2002 by IDG Sweden, a subsidiary of IDG. It was sister publication of Bio-IT World. At its initial phase Biotech Sweden was published seven t... |
https://en.wikipedia.org/wiki/Precision%20rectifier | The precision rectifier is a configuration obtained with an operational amplifier in order to have a circuit behave like an ideal diode and rectifier. It is very useful for high-precision signal processing. With the help of a precision rectifier the high-precision signal processing can be done very easily.
The op-amp... |
https://en.wikipedia.org/wiki/Negative%20impedance%20converter | The negative impedance converter (NIC) is an active circuit which injects energy into circuits in contrast to an ordinary load that consumes energy from them. This is achieved by adding or subtracting excessive varying voltage in series to the voltage drop across an equivalent positive impedance. This reverses the volt... |
https://en.wikipedia.org/wiki/Bel%20decomposition | In semi-Riemannian geometry, the Bel decomposition, taken with respect to a specific timelike congruence, is a way of breaking up the Riemann tensor of a pseudo-Riemannian manifold into lower order tensors with properties similar to the electric field and magnetic field. Such a decomposition was partially described by... |
https://en.wikipedia.org/wiki/Ingredient | In a general sense, an ingredient is a substance which forms part of a mixture. In cooking, recipes specify which ingredients are used to prepare a dish. Many commercial products contain secret ingredients purported to make them better than competing products. In the pharmaceutical industry, an active ingredient is the... |
https://en.wikipedia.org/wiki/Polysorbate | Polysorbates are a class of emulsifiers used in some pharmaceuticals and food preparation. They are commonly used in oral and topical pharmaceutical dosage forms. They are also often used in cosmetics to solubilize essential oils into water-based products. Polysorbates are oily liquids derived from ethoxylated sorbitan... |
https://en.wikipedia.org/wiki/Transketolase | Transketolase (abbreviated as TK) is an enzyme that, in humans, is encoded by the TKT gene. It participates in both the pentose phosphate pathway in all organisms and the Calvin cycle of photosynthesis. Transketolase catalyzes two important reactions, which operate in opposite directions in these two pathways. In the f... |
https://en.wikipedia.org/wiki/Test%20particle | In physical theories, a test particle, or test charge, is an idealized model of an object whose physical properties (usually mass, charge, or size) are assumed to be negligible except for the property being studied, which is considered to be insufficient to alter the behavior of the rest of the system. The concept of ... |
https://en.wikipedia.org/wiki/Herbert%20Sichel | Herbert Sichel (1915–1995) was a statistician who made great advances in the areas of both theoretical and applied statistics.
He developed the Sichel-t estimator for the log-normal distribution's t-statistic. He also made great leaps in the area of the generalized inverse Gaussian distribution, the mixture of which w... |
https://en.wikipedia.org/wiki/Oil%20analysis | Oil analysis (OA) is the laboratory analysis of a lubricant's properties, suspended contaminants, and wear debris. OA is performed during routine predictive maintenance to provide meaningful and accurate information on lubricant and machine condition. By tracking oil analysis sample results over the life of a particula... |
https://en.wikipedia.org/wiki/Gr%C3%A9goire%20de%20Saint-Vincent | Grégoire de Saint-Vincent - in Latin : Gregorius a Sancto Vincentio, in Dutch : Gregorius van St-Vincent - (8 September 1584 Bruges – 5 June 1667 Ghent) was a Flemish Jesuit and mathematician. He is remembered for his work on quadrature of the hyperbola.
Grégoire gave the "clearest early account of the summation of g... |
https://en.wikipedia.org/wiki/Curvature%20invariant | In Riemannian geometry and pseudo-Riemannian geometry, curvature invariants are scalar quantities constructed from tensors that represent curvature. These tensors are usually the Riemann tensor, the Weyl tensor, the Ricci tensor and tensors formed from these by the operations of taking dual contractions and covariant d... |
https://en.wikipedia.org/wiki/Cartan%E2%80%93Karlhede%20algorithm | The Cartan–Karlhede algorithm is a procedure for completely classifying and comparing Riemannian manifolds. Given two Riemannian manifolds of the same dimension, it is not always obvious whether they are locally isometric. Élie Cartan, using his exterior calculus with his method of moving frames, showed that it is al... |
https://en.wikipedia.org/wiki/Parameterized%20post-Newtonian%20formalism | In physics, precisely in the study of the theory of general relativity and many alternatives to it, the post-Newtonian formalism is a calculational tool that expresses Einstein's (nonlinear) equations of gravity in terms of the lowest-order deviations from Newton's law of universal gravitation. This allows approximatio... |
https://en.wikipedia.org/wiki/Hole%20argument | In general relativity, the hole argument is an apparent paradox that much troubled Albert Einstein while developing his famous field equations.
Some philosophers of physics take the argument to raise a problem for manifold substantialism, a doctrine that the manifold of events in spacetime is a "substance" which exist... |
https://en.wikipedia.org/wiki/The%20New%20Dinosaurs | The New Dinosaurs: An Alternative Evolution is a 1988 speculative evolution book written by Scottish geologist and palaeontologist Dougal Dixon and illustrated by several illustrators including Amanda Barlow, Peter Barrett, John Butler, Jeane Colville, Anthony Duke, Andy Farmer, Lee Gibbons, Steve Holden, Philip Hood, ... |
https://en.wikipedia.org/wiki/Wireless%20security | Wireless security is the prevention of unauthorized access or damage to computers or data using wireless networks, which include Wi-Fi networks. The term may also refer to the protection of the wireless network itself from adversaries seeking to damage the confidentiality, integrity, or availability of the network. The... |
https://en.wikipedia.org/wiki/Thexder | is a run and gun video game from Game Arts, originally released for the NEC PC-8801 in 1985. It was ported to many systems, including the Famicom.
Gameplay
In Thexder, the player controls a fighter robot that is able to transform into a jet and shoot lasers.
Release
The game was originally released in 1985 for the... |
https://en.wikipedia.org/wiki/Via%20%28electronics%29 | A via (Latin, 'path' or 'way') is an electrical connection between two or more metal layers, and are commonly used in printed circuit boards (PCB). Essentially a via is a small drilled hole that goes through two or more adjacent layers; the hole is plated with metal (often copper) that forms an electrical connection th... |
https://en.wikipedia.org/wiki/Ursid%20hybrid | An ursid hybrid is an animal with parents from two different species or subspecies of the bear family (Ursidae). Species and subspecies of bear known to have produced offspring with another bear species or subspecies include American black bears, grizzly bears, and polar bears, all of which are members of the genus Urs... |
https://en.wikipedia.org/wiki/Robert%20Brunner | Robert Brunner (born 1958) is an American industrial designer. Brunner was the Director of Industrial Design for Apple Computer from 1989 to 1996, and is a founder and current partner at Ammunition Design Group.
Biography
Brunner received a Bachelor of Science degree in Industrial Design from San José State Universit... |
https://en.wikipedia.org/wiki/Ceroid%20cactus | The term ceroid cactus (or sometimes just cereus) is used to describe any of the species of cacti with very elongated bodies, including columnar growth cacti and epiphytic cacti.
The name is from the Latin cēreus, wax taper (slender candle), referring to the stiff, upright form of the columnar species. Some species of ... |
https://en.wikipedia.org/wiki/Normal%20height | Normal heights (symbol or ; SI unit metre, m) is a type of height above sea level introduced by Mikhail Molodenskii.
The normal height of a point is computed as the quotient of a point's geopotential number (i.e. its geopotential difference with that of sea level), by the average, normal gravity computed along the plu... |
https://en.wikipedia.org/wiki/Hylonomus | Hylonomus (; hylo- "forest" + nomos "dweller") is an extinct genus of reptile that lived 312 million years ago during the Late Carboniferous period.
It is the earliest unquestionable reptile (Westlothiana is older, but in fact it may have been an amphibian, and Casineria is rather fragmentary). The only species is the ... |
https://en.wikipedia.org/wiki/Rvachev%20function | In mathematics, an R-function, or Rvachev function, is a real-valued function whose sign does not change if none of the signs of its arguments change; that is, its sign is determined solely by the signs of its arguments.
Interpreting positive values as true and negative values as false, an R-function is transformed in... |
https://en.wikipedia.org/wiki/Halobacterium | Halobacterium (common abbreviation Hbt.) is a genus in the family Halobacteriaceae.
The genus Halobacterium ("salt" or "ocean bacterium") consists of several species of Archaea with an aerobic metabolism which requires an environment with a high concentration of salt; many of their proteins will not function in low-sa... |
https://en.wikipedia.org/wiki/Guanacastepene%20A | Guanacastepene A is a compound showing antibiotic activity. It is a diterpene that was extracted with hexane from a Costa Rican fungus, CR115, found on the branches of the Daphnopsis americana tree and purified by chromatography. |
https://en.wikipedia.org/wiki/Wm.%20K.%20Walthers | Wm. K. Walthers, Inc. is a manufacturer and distributor of model railroad supplies and tools.
History
Wm. K. Walthers, Inc., was officially founded in Milwaukee in 1932—though it started years earlier when seven-year-old William K. (Bill) Walthers got his first taste of the hobby with a small, wind-up toy train for Ch... |
https://en.wikipedia.org/wiki/Geriatric%20dentistry | Geriatric dentistry is the delivery of dental care to older adults involving diagnosis, prevention, management and treatment of problems associated with age related diseases. The mouth is referred to as a mirror of overall health, reinforcing that oral health is an integral part of general health. In the elderly popula... |
https://en.wikipedia.org/wiki/Relapsing%20polychondritis | Relapsing polychondritis is a multi-systemic condition characterized by repeated episodes of inflammation and deterioration of cartilage. The often painful disease can cause joint deformity and be life-threatening if the respiratory tract, heart valves, or blood vessels are affected. The exact mechanism is poorly under... |
https://en.wikipedia.org/wiki/Drag%20count | A drag count is a dimensionless unit used by aerospace engineers. 1 drag count is equal to a of 0.0001.
As the drag forces present on automotive vehicles are smaller than for aircraft, 1 drag count is commonly referred to as 0.001 of .
Definition
A drag count is defined as:
where:
is the drag force, which is... |
https://en.wikipedia.org/wiki/Sieve%20%28mail%20filtering%20language%29 | Sieve is a programming language that can be used for email filtering. It owes its creation to the CMU Cyrus Project, creators of Cyrus IMAP server.
The language is not tied to any particular operating system or mail architecture. It requires the use of RFC-2822–compliant messages, but otherwise generalizes to other sy... |
https://en.wikipedia.org/wiki/Stenospermocarpy | Stenospermocarpy is the biological mechanism that produces parthenocarpy (seedlessness) in some fruits, notably many table grapes.
In stenospermocarpic fruits, normal pollination and fertilization are still required to ensure that the fruit 'sets', i.e. continues to develop on the plant; however subsequent abortion o... |
https://en.wikipedia.org/wiki/Conrad%20Elvehjem | Conrad Arnold Elvehjem (May 27, 1901July 27, 1962) was internationally known as an American biochemist in nutrition. In 1937 he identified two vitamins, nicotinic acid, also known as niacin, and nicotinamide, which were deficient directly in human pellagra, once a major health problem in the United States. Collectively... |
https://en.wikipedia.org/wiki/Level-spacing%20distribution | In mathematical physics, level spacing is the difference between consecutive elements in some set of real numbers. In particular, it is the difference between consecutive energy levels or eigenvalues of a matrix or linear operator.
Mathematical physics |
https://en.wikipedia.org/wiki/Fredholm%20determinant | In mathematics, the Fredholm determinant is a complex-valued function which generalizes the determinant of a finite dimensional linear operator. It is defined for bounded operators on a Hilbert space which differ from the identity operator by a trace-class operator. The function is named after the mathematician Erik Iv... |
https://en.wikipedia.org/wiki/Psychometric%20function | A psychometric function is an inferential psychometric model applied in detection and discrimination tasks. It models the relationship between a given feature of a physical stimulus, e.g. velocity, duration, brightness, weight etc., and forced-choice responses of a human or animal test subject. The psychometric functio... |
https://en.wikipedia.org/wiki/Z-Wave | Z-Wave is a wireless communications protocol used primarily for residential and commercial building automation. It is a mesh network using low-energy radio waves to communicate from device to device, allowing for wireless control of smart home devices, such as smart lights, security systems, thermostats, sensors, smart... |
https://en.wikipedia.org/wiki/Attosecond%20physics | Attosecond physics, also known as attophysics, or more generally attosecond science, is a branch of physics that deals with light-matter interaction phenomena wherein attosecond (10−18 s) photon pulses are used to unravel dynamical processes in matter with unprecedented time resolution.
Attosecond science mainly emplo... |
https://en.wikipedia.org/wiki/Physical%20symbol%20system | A physical symbol system (also called a formal system) takes physical patterns (symbols), combining them into structures (expressions) and manipulating them (using processes) to produce new expressions.
The physical symbol system hypothesis (PSSH) is a position in the philosophy of artificial intelligence formulated b... |
https://en.wikipedia.org/wiki/Piezophile | A piezophile (from Greek "piezo-" for pressure and "-phile" for loving) is an organism with optimal growth under high hydrostatic pressure i.e. an organism that has its maximum rate of growth at a hydrostatic pressure equal to or above 10 MPa (= 99 atm = 1,450 psi), when tested over all permissible temperatures. Origin... |
https://en.wikipedia.org/wiki/Aerospace%20physiology | Aerospace physiology is the study of the effects of high altitudes on the body, such as different pressures and levels of oxygen. At different altitudes the body may react in different ways, provoking more cardiac output, and producing more erythrocytes. These changes cause more energy waste in the body, causing muscle... |
https://en.wikipedia.org/wiki/Tryptone | Tryptone is the assortment of peptides formed by the digestion of casein by the protease trypsin.
Tryptone is commonly used in microbiology to produce lysogeny broth (LB) for the growth of E. coli and other microorganisms. It provides a source of amino acids for the growing bacteria. Tryptone is similar to casamino a... |
https://en.wikipedia.org/wiki/Ring%20of%20sets | In mathematics, there are two different notions of a ring of sets, both referring to certain families of sets.
In order theory, a nonempty family of sets is called a ring (of sets) if it is closed under union and intersection. That is, the following two statements are true for all sets and ,
implies and
implies ... |
https://en.wikipedia.org/wiki/A%20Hole%20in%20Texas | A Hole In Texas is a novel by Herman Wouk. Published in 2004, the book describes the adventures of a high-energy physicist following the surprise announcement that a Chinese physicist (with whom he had a long-ago romance) had discovered the long-sought Higgs boson.
Parts of the plot are based on the aborted Supercondu... |
https://en.wikipedia.org/wiki/Polyphenism | A polyphenic trait is a trait for which multiple, discrete phenotypes can arise from a single genotype as a result of differing environmental conditions. It is therefore a special case of phenotypic plasticity.
There are several types of polyphenism in animals, from having sex determined by the environment to the cast... |
https://en.wikipedia.org/wiki/Microsoft%20Analysis%20Services | Microsoft SQL Server Analysis Services (SSAS) is an online analytical processing (OLAP) and data mining tool in Microsoft SQL Server. SSAS is used as a tool by organizations to analyze and make sense of information possibly spread out across multiple databases, or in disparate tables or files. Microsoft has included a ... |
https://en.wikipedia.org/wiki/Interferon%20gamma | Interferon gamma (IFN-γ) is a dimerized soluble cytokine that is the only member of the type II class of interferons. The existence of this interferon, which early in its history was known as immune interferon, was described by E. F. Wheelock as a product of human leukocytes stimulated with phytohemagglutinin, and by o... |
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