text stringlengths 11 320k | source stringlengths 26 161 |
|---|---|
In the mathematical field of order theory , an ultrafilter on a given partially ordered set (or "poset") P {\textstyle P} is a certain subset of P , {\displaystyle P,} namely a maximal filter on P ; {\displaystyle P;} that is, a proper filter on P {\textstyle P} that cannot be enlarged to a bigger proper filter on P . ... | https://en.wikipedia.org/wiki/Ultrafilter |
In the mathematical field of set theory , an ultrafilter on a set X {\displaystyle X} is a maximal filter on the set X . {\displaystyle X.} In other words, it is a collection of subsets of X {\displaystyle X} that satisfies the definition of a filter on X {\displaystyle X} and that is maximal with respect to inclusion,... | https://en.wikipedia.org/wiki/Ultrafilter_on_a_set |
Ultrafiltered milk , also known as UF milk , UF skim , or diafiltered milk , is a subclassification of milk protein concentrate that is produced by passing milk under pressure through a thin, porous membrane to separate the components of milk according to size. [ 1 ] [ 2 ] Specifically, ultrafiltration allows the small... | https://en.wikipedia.org/wiki/Ultrafiltered_milk |
Ultrafiltration ( UF ) is a variety of membrane filtration in which forces such as pressure or concentration gradients lead to a separation through a semipermeable membrane . Suspended solids and solutes of high molecular weight are retained in the so-called retentate, while water and low molecular weight solutes pass ... | https://en.wikipedia.org/wiki/Ultrafiltration |
In the philosophy of mathematics , ultrafinitism (also known as ultraintuitionism , [ 1 ] strict formalism , [ 2 ] strict finitism , [ 2 ] actualism , [ 1 ] predicativism , [ 2 ] [ 3 ] and strong finitism ) [ 2 ] is a form of finitism and intuitionism . There are various philosophies of mathematics that are called ultr... | https://en.wikipedia.org/wiki/Ultrafinitism |
In mathematics , an ultragraph C*-algebra is a universal C*-algebra generated by partial isometries on a collection of Hilbert spaces constructed from ultragraphs. [ 1 ] pp. 6-7 . These C*-algebras were created in order to simultaneously generalize the classes of graph C*-algebras and Exel–Laca algebras, giving a unifi... | https://en.wikipedia.org/wiki/Ultragraph_C*-algebra |
In chemistry and materials science , ultrahydrophobic (or superhydrophobic ) surfaces are highly hydrophobic , i.e., extremely difficult to wet . The contact angles of a water droplet on an ultrahydrophobic material exceed 150°. [ 1 ] This is also referred to as the lotus effect , after the superhydrophobic leaves of t... | https://en.wikipedia.org/wiki/Ultrahydrophobicity |
Ultramicrobacteria are bacteria that are smaller than 0.1 μm 3 under all growth conditions. [ 1 ] [ 2 ] [ 3 ] This term was coined in 1981, describing cocci in seawater that were less than 0.3 μm in diameter. [ 4 ] Ultramicrobacteria have also been recovered from soil and appear to be a mixture of gram-positive , gram-... | https://en.wikipedia.org/wiki/Ultramicrobacteria |
Ultramicrotomy is a method for cutting specimens into extremely thin slices, called ultra-thin sections, that can be studied and documented at different magnifications in a transmission electron microscope (TEM). It is used mostly for biological specimens, but sections of plastics and soft metals can also be prepared. ... | https://en.wikipedia.org/wiki/Ultramicrotomy |
In hyperbolic geometry , two lines are said to be ultraparallel if they do not intersect and are not limiting parallel .
The ultraparallel theorem states that every pair of (distinct) ultraparallel lines has a unique common perpendicular (a hyperbolic line which is perpendicular to both lines).
Let r and s be two ult... | https://en.wikipedia.org/wiki/Ultraparallel_theorem |
In mathematics , an ultrapolynomial is a power series in several variables whose coefficients are bounded in some specific sense.
Let d ∈ N {\displaystyle d\in \mathbb {N} } and K {\displaystyle K} a field (typically R {\displaystyle \mathbb {R} } or C {\displaystyle \mathbb {C} } ) equipped with a norm (typically the... | https://en.wikipedia.org/wiki/Ultrapolynomial |
Ultrapotassic igneous rocks are a class of rare, volumetrically minor, generally ultramafic or mafic silica-depleted igneous rocks .
While there are debates on the exact classifications of ultrapotassic rocks, they are defined by using the chemical screens K 2 O/Na 2 O > 3 in much of the scientific literature. [ 1 ] H... | https://en.wikipedia.org/wiki/Ultrapotassic_igneous_rocks |
The ultraproduct is a mathematical construction that appears mainly in abstract algebra and mathematical logic , in particular in model theory and set theory . An ultraproduct is a quotient of the direct product of a family of structures . All factors need to have the same signature . The ultrapower is the special case... | https://en.wikipedia.org/wiki/Ultraproduct |
Ultrapure water ( UPW ), high-purity water or highly purified water ( HPW ) is water that has been purified to uncommonly stringent specifications. Ultrapure water is a term commonly used in manufacturing to emphasize the fact that the water is treated to the highest levels of purity for all contaminant types, includin... | https://en.wikipedia.org/wiki/Ultrapure_water |
In molecular biology , ultrasensitivity describes an output response that is more sensitive to stimulus change than the hyperbolic Michaelis-Menten response . Ultrasensitivity is one of the biochemical switches in the cell cycle and has been implicated in a number of important cellular events, including exiting G2 cell... | https://en.wikipedia.org/wiki/Ultrasensitivity |
Ultrasonic antifouling is a technology that uses high frequency sound ( ultrasound ) to prevent or reduce biofouling on underwater structures, surfaces, and media. Ultrasound is high-frequency sound above the range humans can hear, though other animals may be able to, and otherwise it has the same physical properties a... | https://en.wikipedia.org/wiki/Ultrasonic_algae_control |
Ultrasonic impact treatment ( UIT ) is a metallurgical processing technique, similar to work hardening , in which ultrasonic energy is applied to a metal object. This technique is part of the High Frequency Mechanical Impact (HFMI) processes. Other acronyms are also equivalent: Ultrasonic Needle Peening (UNP), Ultraso... | https://en.wikipedia.org/wiki/Ultrasonic_impact_treatment |
An ultrasonic pulse velocity test is an in-situ , nondestructive test to check the quality of concrete and natural rocks. In this test, the strength and quality of concrete or rock is assessed by measuring the velocity of an ultrasonic pulse passing through a concrete structure or natural rock formation.
This test is ... | https://en.wikipedia.org/wiki/Ultrasonic_pulse_velocity_test |
Ultrasonic welding is an industrial process whereby high-frequency ultrasonic acoustic vibrations are locally applied to work pieces being held together under pressure to create a solid-state weld . It is commonly used for plastics and metals , and especially for joining dissimilar materials . In ultrasonic welding, th... | https://en.wikipedia.org/wiki/Ultrasonic_welding |
Ultrasound attenuation spectroscopy is a method for characterizing properties of fluids and dispersed particles . It is also known as acoustic spectroscopy .
There is an international standard for this method. [ 1 ] [ 2 ]
Measurement of attenuation coefficient versus ultrasound frequency yields raw data for further c... | https://en.wikipedia.org/wiki/Ultrasound_attenuation_spectroscopy |
Ultrastructural identity is a concept in biology . It asserts that evolutionary lineages of eukaryotes in general and protists in particular can be distinguished by complements and arrangements of cellular organelles . These ultrastructural components can be visualized by electron microscopy .
The concept emerged foll... | https://en.wikipedia.org/wiki/Ultrastructural_identity |
In biochemistry , an ultratrace element is a chemical element that normally comprises less than one microgram per gram of a given organism (i.e. less than 0.0001% by weight), but which plays a significant role in its metabolism .
Possible ultratrace elements in humans include boron , silicon , nickel , vanadium [ 1 ] ... | https://en.wikipedia.org/wiki/Ultratrace_element |
Ultraviolet radiation , also known as simply UV , is electromagnetic radiation of wavelengths of 10–400 nanometers , shorter than that of visible light , but longer than X-rays . UV radiation is present in sunlight and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced... | https://en.wikipedia.org/wiki/Ultraviolet |
Ultraviolet-sensitive beads (UV beads) are beads that are colorful in the presence of ultraviolet radiation . Ultraviolet rays are present in sunlight and light from various artificial sources and can cause sunburn or skin cancer . [ 1 ] The color change in the beads alerts the wearer to the presence of the radiation.... | https://en.wikipedia.org/wiki/Ultraviolet-sensitive_bead |
Ultraviolet astronomy is the observation of electromagnetic radiation at ultraviolet wavelengths between approximately 10 and 320 nanometres ; shorter wavelengths—higher energy photons—are studied by X-ray astronomy and gamma-ray astronomy . [ 1 ] Ultraviolet light is not visible to the human eye . [ 2 ] Most of the li... | https://en.wikipedia.org/wiki/Ultraviolet_astronomy |
The ultraviolet catastrophe , also called the Rayleigh–Jeans catastrophe , was the prediction of late 19th century and early 20th century classical physics that an ideal black body at thermal equilibrium would emit an unbounded quantity of energy as wavelength decreased into the ultraviolet range. [ 1 ] : 6–7 The term ... | https://en.wikipedia.org/wiki/Ultraviolet_catastrophe |
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 electrodyna... | https://en.wikipedia.org/wiki/Ultraviolet_fixed_point |
Ultraviolet germicidal irradiation (UVGI) is a disinfection technique employing ultraviolet (UV) light, particularly UV-C (180–280 nm), to kill or inactivate microorganisms . UVGI primarily inactivates microbes by damaging their genetic material, thereby inhibiting their capacity to carry out vital functions. [ 1 ]
Th... | https://en.wikipedia.org/wiki/Ultraviolet_germicidal_irradiation |
Ultraviolet photoelectron spectroscopy ( UPS ) refers to the measurement of kinetic energy spectra of photoelectrons emitted by molecules that have absorbed ultraviolet photons, in order to determine molecular orbital energies in the valence region.
If Albert Einstein 's photoelectric law is applied to a free molecule... | https://en.wikipedia.org/wiki/Ultraviolet_photoelectron_spectroscopy |
Ultraviolet–visible spectroscopy (UV–vis) can distinguish between enantiomers by showing a distinct Cotton effect for each isomer. UV–vis spectroscopy sees only chromophores , so other molecules must be prepared for analysis by chemical addition of a chromophore such as anthracene . Two methods are reported: the octa... | https://en.wikipedia.org/wiki/Ultraviolet–visible_spectroscopy_of_stereoisomers |
Ultrawide formats refers to photos, videos, [ 1 ] and displays [ 2 ] with aspect ratios greater than 2. There were multiple moves in history towards wider formats, including one by Disney, [ 3 ] with some of them being more successful than others.
Cameras usually capture ultra-wide photos and videos using an anamorp... | https://en.wikipedia.org/wiki/Ultrawide_formats |
In placental mammals , the umbilical cord (also called the navel string , [ 1 ] birth cord or funiculus umbilicalis ) is a conduit between the developing embryo or fetus and the placenta . During prenatal development , the umbilical cord is physiologically and genetically part of the fetus and (in humans) normally cont... | https://en.wikipedia.org/wiki/Umbilical_cord |
An umbilicate lichen is a lichen that is only attached to its substrate at a single point. [ 1 ] An example is Lasallia papulosa . [ 1 ]
This article about lichens or lichenology is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/Umbilicate_lichen |
An umbo is a raised area in the center of a mushroom cap. Caps that possess this feature are called umbonate . Umbos that are sharply pointed are called acute , while those that are more rounded are broadly umbonate . If the umbo is elongated, it is cuspidate , and if the umbo is sharply delineated but not elongated (s... | https://en.wikipedia.org/wiki/Umbo_(mycology) |
Umbrella sampling is a technique in computational physics and chemistry , used to improve sampling of a system (or different systems) where ergodicity is hindered by the form of the system's energy landscape . It was first suggested by Torrie and Valleau in 1977. [ 1 ] It is a particular physical application of the mor... | https://en.wikipedia.org/wiki/Umbrella_sampling |
Umbrella species are species selected for making conservation -related decisions, typically because protecting these species indirectly protects the many other species that make up the ecological community of its habitat (the umbrella effect ). Species conservation can be subjective because it is hard to determine the ... | https://en.wikipedia.org/wiki/Umbrella_species |
In crystalline materials , Umklapp scattering (also U-process or Umklapp process ) is a scattering process that results in a wave vector (usually written k ) which falls outside the first Brillouin zone . If a material is periodic, it has a Brillouin zone, and any point outside the first Brillouin zone can also be expr... | https://en.wikipedia.org/wiki/Umklapp_scattering |
In organic chemistry , umpolung ( German: [ˈʔʊmˌpoːlʊŋ] ) or polarity inversion is the chemical modification of a functional group with the aim of the reversal of polarity of that group. [ 1 ] [ 2 ] This modification allows secondary reactions of this functional group that would otherwise not be possible. [ 3 ] The con... | https://en.wikipedia.org/wiki/Umpolung |
Una Ryan (born December 18, 1941) is a British-American biologist who has conducted research on vascular biology, publishing over 300 papers. After an extended research and academic career she began a career in the biotech industry . She was Director for Health Sciences of Monsanto Company ; CEO, president and director... | https://en.wikipedia.org/wiki/Una_Ryan |
In reliability engineering , the term availability has the following meanings:
Normally high availability systems might be specified as 99.98%, 99.999% or 99.9996%. The converse, unavailability , is 1 minus the availability.
The simplest representation of availability ( A ) is a ratio of the expected value of the upt... | https://en.wikipedia.org/wiki/Unavailability |
Uncacheable speculative write combining ( USWC ), is a computer BIOS setting for memory communication between a CPU and graphics card . [ 1 ] [ 2 ] [ 3 ] It allows faster communication than the "uncachable" setting (the alternative to USWC in the BIOS), as long as the graphics card supports write combining (which most ... | https://en.wikipedia.org/wiki/Uncacheable_speculative_write_combining |
The detailed design of buildings needs to take into account various external factors, which may be subject to uncertainties . Among these factors are prevailing weather and climate ; the properties of the materials used and the standard of workmanship ; and the behaviour of occupants of the building. Several studies ha... | https://en.wikipedia.org/wiki/Uncertainties_in_building_design_and_building_energy_assessment |
The uncertainty effect , also known as direct risk aversion , is a phenomenon from economics and psychology which suggests that individuals may be prone to expressing such an extreme distaste for risk that they ascribe a lower value to a risky prospect (e.g., a lottery for which outcomes and their corresponding probabi... | https://en.wikipedia.org/wiki/Uncertainty_effect |
The uncertainty principle , also known as Heisenberg's indeterminacy principle , is a fundamental concept in quantum mechanics . It states that there is a limit to the precision with which certain pairs of physical properties, such as position and momentum , can be simultaneously known. In other words, the more accurat... | https://en.wikipedia.org/wiki/Uncertainty_principle |
In computer interface design, to unclick is to deselect a specific preference, [ 2 ] [ 3 ] typically by tapping a selected checkbox with a finger or cursor. As a result, the check mark image or dark circle inside the box is removed.
As the Internet becomes an increasingly popular medium for marketers , vendors and mar... | https://en.wikipedia.org/wiki/Unclick |
Uncomfortable science , as identified by statistician John Tukey , [ 1 ] [ 2 ] comprises situations in which there is a need to draw an inference from a limited sample of data , where further samples influenced by the same cause system will not be available. More specifically, it involves the analysis of a finite natur... | https://en.wikipedia.org/wiki/Uncomfortable_science |
Uncompressed video is digital video that either has never been compressed or was generated by decompressing previously compressed digital video. It is commonly used by video cameras, video monitors, video recording devices (including general-purpose computers), and in video processors that perform functions such as ima... | https://en.wikipedia.org/wiki/Uncompressed_video |
In mathematics , specifically functional analysis , a series is unconditionally convergent if all reorderings of the series converge to the same value. In contrast, a series is conditionally convergent if it converges but different orderings do not all converge to that same value. Unconditional convergence is equivalen... | https://en.wikipedia.org/wiki/Unconditional_convergence |
Unconventional protein secretion (known as ER/Golgi-independent protein secretion or nonclassical protein export [ 1 ] ) represents a manner in which the proteins are delivered to the surface of plasma membrane or extracellular matrix independent of the endoplasmic reticulum or Golgi apparatus . [ 2 ] This includes cyt... | https://en.wikipedia.org/wiki/Unconventional_protein_secretion |
Unconventional superconductors are materials that display superconductivity which is not explained by the usual BCS theory or its extension, the Eliashberg theory . The pairing in unconventional superconductors may originate from some other mechanism than the electron–phonon interaction. [ 1 ] Alternatively, a supercon... | https://en.wikipedia.org/wiki/Unconventional_superconductor |
In game theory an uncorrelated asymmetry is an arbitrary asymmetry in a game which is otherwise symmetrical . The name 'uncorrelated asymmetry' is due to John Maynard Smith who called payoff relevant asymmetries in games with similar roles for each player 'correlated asymmetries' (note that any game with correlated as... | https://en.wikipedia.org/wiki/Uncorrelated_asymmetry |
An uncoupling protein ( UCP ) is a mitochondrial inner membrane protein that is a regulated proton channel or transporter. An uncoupling protein is thus capable of dissipating the proton gradient generated by NADH -powered pumping of protons from the mitochondrial matrix to the mitochondrial intermembrane space. The en... | https://en.wikipedia.org/wiki/Uncoupling_protein |
Uncrewed spacecraft or robotic spacecraft are spacecraft without people on board. Uncrewed spacecraft may have varying levels of autonomy from human input, such as remote control , or remote guidance. They may also be autonomous , in which they have a pre-programmed list of operations that will be executed unless other... | https://en.wikipedia.org/wiki/Uncrewed_spacecraft |
Undark was a trade name for luminous paint made with a mixture of radioactive radium and zinc sulfide , as produced by the U.S. Radium Corporation between 1917 and 1926. [ 1 ] The U.S. Radium Corporation was based in Orange, New Jersey , but was not the only radium-painting business in the United States. Other big name... | https://en.wikipedia.org/wiki/Undark |
In mathematics, the term undefined refers to a value , function , or other expression that cannot be assigned a meaning within a specific formal system . [ 1 ]
Attempting to assign or use an undefined value within a particular formal system, may produce contradictory or meaningless results within that system. In pract... | https://en.wikipedia.org/wiki/Undefined_(mathematics) |
Under cover removal , or UCR , is a method for colour printers to use less ink . Black ink is used for grey colours instead of the three CMY inks.
This computing article is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/Under_cover_removal |
In manufacturing , an undercut is a special type of recessed surface that is inaccessible using a straight tool. In turning , it refers to a recess in a diameter generally on the inside diameter of the part. In milling , it refers to a feature which is not visible when the part is viewed from the spindle. In molding , ... | https://en.wikipedia.org/wiki/Undercut_(manufacturing) |
In turning , an undercut is a recess in a diameter generally on the inside diameter of the part.
On turned parts an undercut is also known as a neck or "relief groove". They are often used at the end of the threaded portion of a shaft or screw to provide clearance for the cutting tool, and also referred to as thread r... | https://en.wikipedia.org/wiki/Undercut_(turning) |
In mathematics , a system of linear equations or a system of polynomial equations is considered underdetermined if there are fewer equations than unknowns [ 1 ] (in contrast to an overdetermined system , where there are more equations than unknowns). The terminology can be explained using the concept of constraint coun... | https://en.wikipedia.org/wiki/Underdetermined_system |
Underglaze is a method of decorating pottery in which painted decoration is applied to the surface before it is covered with a transparent ceramic glaze and fired in a kiln . Because the glaze subsequently covers it, such decoration is completely durable, and it also allows the production of pottery with a surface that... | https://en.wikipedia.org/wiki/Underglaze |
The Underground House in Ward, Colorado , was a subterranean dwelling known for its architectural design, which embraced the concept of underground living. The house was designed by architect Julian "Jay" Swayze (1923–1981) in the 1960s. The dwelling is an example of an unconventional approach to residential constructi... | https://en.wikipedia.org/wiki/Underground_House_Colorado |
The Underground House in Las Vegas , Nevada, is a Cold War -era subterranean dwelling. This structure was built in the wake of the Cuban Missile Crisis .The house was completed in the 1978. [ 2 ] [ 3 ]
In 1969, the Avon Products executive Girard B. Henderson relocated to Las Vegas , Nevada , and embarked on the const... | https://en.wikipedia.org/wiki/Underground_House_Las_Vegas |
An underground personnel carrier is any heavy duty vehicle designed specifically for the safe transport of personnel and their supplies into underground work areas. The most common underground applications is for the mining of either precious metal or coal .
Where tight turning in confined spaces is necessary, person... | https://en.wikipedia.org/wiki/Underground_personnel_carrier |
An underground storage tank ( UST ) is, according to United States federal regulations, a storage tank , including any underground piping connected to the tank, that has at least 10 percent of its volume underground.
"Underground storage tank" or "UST" means any one or combination of tanks including connected undergro... | https://en.wikipedia.org/wiki/Underground_storage_tank |
The Underhanded C Contest was a programming contest to turn out code that is malicious, but passes a rigorous inspection, and looks like an honest mistake even if discovered . The contest rules define a task, and a malicious component. Entries must perform the task in a malicious manner as defined by the contest, and h... | https://en.wikipedia.org/wiki/Underhanded_C_Contest |
In particle physics , underlying event (UE) refers to the additional interactions of two particle beams at a collision point beyond the main collision under study. Specifically, the term is used for hadron collider events which do not originate from the primary hard scattering (high energy, high momentum impact) proces... | https://en.wikipedia.org/wiki/Underlying_event |
In construction or renovation , underpinning is the process of strengthening the foundation of an existing building or other structure . Underpinning may be necessary for a variety of reasons:
Underpinning may be accomplished by extending the foundation in depth or breadth so it either rests on a more supportive soil... | https://en.wikipedia.org/wiki/Underpinning |
Underpotential deposition ( UPD ), in electrochemistry , is a phenomenon of electrodeposition of a species (typically reduction of a metal cation to a solid metal) at a potential less negative than the equilibrium ( Nernst ) potential for the reduction of this metal. The equilibrium potential for the reduction of a met... | https://en.wikipedia.org/wiki/Underpotential_deposition |
In forestry and ecology , understory ( American English ), or understorey ( Commonwealth English ), also known as underbrush or undergrowth , includes plant life growing beneath the forest canopy without penetrating it to any great extent, but above the forest floor . Only a small percentage of light penetrates the can... | https://en.wikipedia.org/wiki/Understory |
The undervoltage-lockout ( UVLO ) is an electronic circuit used to turn off the power of an electronic device in the event of the voltage dropping below the operational value that could cause unpredictable system behavior. For instance, in battery powered embedded devices , UVLOs can be used to monitor the battery volt... | https://en.wikipedia.org/wiki/Undervoltage-lockout |
The Underwater Association (UA) was a research association focused on the conduct of research underwater by diving scientists and archaeologists . It was established by a group of UK scientists in Malta in 1966 to assist in the organisation and publication of British diving science. Membership grew to over 400, with ap... | https://en.wikipedia.org/wiki/Underwater_Association |
The Underwater Demolition Team ( UDT ), or frogmen , were amphibious units created by the United States Navy during World War II with specialized missions. They were predecessors of the Navy's current SEAL teams .
Their primary WWII function began with reconnaissance and underwater demolition of natural or man-made ob... | https://en.wikipedia.org/wiki/Underwater_Demolition_Team |
Underwater construction is industrial construction in an underwater environment . It is a part of the marine construction industry. [ 1 ] It can involve the use of a variety of building materials, mainly concrete and steel. There is often, but not necessarily, a significant component of commercial diving involved. [ 2 ... | https://en.wikipedia.org/wiki/Underwater_concrete_placement |
Underwater construction is industrial construction in an underwater environment . It is a part of the marine construction industry. [ 1 ] It can involve the use of a variety of building materials, mainly concrete and steel. There is often, but not necessarily, a significant component of commercial diving involved. [ 2 ... | https://en.wikipedia.org/wiki/Underwater_construction |
An underwater explosion (also known as an UNDEX ) is a chemical or nuclear explosion that occurs under the surface of a body of water. While useful in anti-ship and submarine warfare, underwater bombs are not as effective against coastal facilities.
Underwater explosions differ from in-air explosions due to the proper... | https://en.wikipedia.org/wiki/Underwater_explosion |
Underwater habitats are underwater structures in which people can live for extended periods and carry out most of the basic human functions of a 24-hour day , such as working, resting, eating, attending to personal hygiene, and sleeping. In this context, ' habitat ' is generally used in a narrow sense to mean the inter... | https://en.wikipedia.org/wiki/Underwater_habitat |
In anatomy , Underwood's septa (or maxillary sinus septa , singular septum ) [ 1 ] [ 2 ] are fin-shaped projections of bone that may exist in the maxillary sinus , first described in 1910 by Arthur S. Underwood, an anatomist at King's College in London . [ 3 ] The presence of septa at or near the floor of the sinus are... | https://en.wikipedia.org/wiki/Underwood's_septa |
An unditching beam is a device that is used to aid in the recovery of armoured fighting vehicles when they become bogged or "ditched". The device is a beam that is attached to the continuous tracks that provides additional traction for the vehicle to extricate itself from a ditch or from boggy conditions.
The unditchi... | https://en.wikipedia.org/wiki/Unditching_beam |
Unequal crossing over is a type of gene duplication or deletion event that deletes a sequence in one strand and replaces it with a duplication from its sister chromatid in mitosis or from its homologous chromosome during meiosis . It is a type of chromosomal crossover between homologous sequences that are not paired p... | https://en.wikipedia.org/wiki/Unequal_crossing_over |
The unexpected red theory is a design theory asserting that incorporating red-colored home accessories can enhance interior design . [ 1 ] Coined by Taylor Migliazzo Simon, a designer based in Williamsburg, Brooklyn , [ 2 ] the theory first attained popularity on the social media platform TikTok in January 2024, and ev... | https://en.wikipedia.org/wiki/Unexpected_red_theory |
In quantum mechanics , an unextendible product basis is a set of orthogonal, non- entangled state vectors for a multipartite system, with the property that local operations and classical communication are insufficient to distinguish one member of the set from the others. Because these states are product states and yet ... | https://en.wikipedia.org/wiki/Unextendible_product_basis |
An unfinished building is a building (or other architectural structure, as a bridge, a road or a tower) where construction work was abandoned or on hold at some stage or only exists as a design. It may also refer to buildings that are currently being built, particularly those that have been delayed or at which constru... | https://en.wikipedia.org/wiki/Unfinished_building |
The unfolded protein response ( UPR ) is a cellular stress response related to the endoplasmic reticulum (ER) stress. [ 1 ] It has been found to be conserved between mammalian species, [ 2 ] as well as yeast [ 1 ] [ 3 ] and worm organisms.
The UPR is activated in response to an accumulation of unfolded or misfolded pr... | https://en.wikipedia.org/wiki/Unfolded_protein_response |
Ungiminorine is an acetylcholinesterase inhibitor isolated from Narcissus . [ 1 ]
This organic chemistry article is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/Ungiminorine |
UniBRITE-1 is, along with TUGSAT-1 , one of the first two Austrian satellites to be launched. Along with TUGSAT, it operates as part of the BRIght Target Explorer constellation of satellites. The two spacecraft were launched aboard the same rocket, an Indian PSLV-CA , in February 2013. UniBRITE is an optical astronomy ... | https://en.wikipedia.org/wiki/UniBRITE-1 |
UniFirst Corporation is a uniform rental company based in Wilmington, Massachusetts , United States , that manufactures, sells, and rents uniforms and protective clothing . UniFirst employs more than 14,000 people and has over 260 facilities in the United States , Canada , and Europe , including customer service center... | https://en.wikipedia.org/wiki/UniFirst |
UniFrac , a shortened version of unique fraction metric , is a distance metric used for comparing biological communities . It differs from dissimilarity measures such as Bray-Curtis dissimilarity in that it incorporates information on the relative relatedness of community members by incorporating phylogenetic distances... | https://en.wikipedia.org/wiki/UniFrac |
UniHan IME is an input method based on the framework of IIIMF developed by Hong Kong Sun Wah Hi-Tech Ltd.. UniHan IME is an input method interface that maps the keyboard keys string to the Han character in the latest version of Unicode Table.
UniHan is the CJKV characters section which occupied more than half the stor... | https://en.wikipedia.org/wiki/UniHan_IME |
The Universal PBM Resource for Oligonucleotide-Binding Evaluation ( UniPROBE ) is database of DNA-binding proteins determined by protein-binding microarrays. [ 1 ] [ 2 ] [ 3 ]
This Biological database -related article is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/UniPROBE |
UniProt is a freely accessible database of protein sequence and functional information, many entries being derived from genome sequencing projects . It contains a large amount of information about the biological function of proteins derived from the research literature. It is maintained by the UniProt consortium, which... | https://en.wikipedia.org/wiki/UniProt |
Tensile testing , also known as tension testing , [ 1 ] is a fundamental materials science and engineering test in which a sample is subjected to a controlled tension until failure. Properties that are directly measured via a tensile test are ultimate tensile strength , breaking strength , maximum elongation and reduc... | https://en.wikipedia.org/wiki/Uniaxial_tensile_test |
A unicellular organism , also known as a single-celled organism , is an organism that consists of a single cell , unlike a multicellular organism that consists of multiple cells. Organisms fall into two general categories: prokaryotic organisms and eukaryotic organisms. Most prokaryotes are unicellular and are classifi... | https://en.wikipedia.org/wiki/Unicellular_organism |
A Unicode font is a computer font that maps glyphs to code points defined in the Unicode Standard . [ 1 ] The vast majority of modern computer fonts use Unicode mappings, even those fonts which only include glyphs for a single writing system , or even only support the basic Latin alphabet . The distinction is historic:... | https://en.wikipedia.org/wiki/Unicode_font |
In computing , a Unicode symbol is a Unicode character which is not part of a script used to write a natural language, but is nonetheless available for use as part of a text.
Many of the symbols are drawn from existing character sets or ISO / IEC or other national and international standards. The Unicode Standard stat... | https://en.wikipedia.org/wiki/Unicode_symbol |
UNICOM Focal Point is a portfolio management and decision analysis tool used by the product organizations of corporations and government agencies [ 1 ] to collect information and feedback from internal and external stakeholders on the value of applications, products, systems, technologies, capabilities, ideas, and othe... | https://en.wikipedia.org/wiki/Unicom_Focal_Point |
A unicorn horn , also known as an alicorn , [ 1 ] is a legendary object whose reality was accepted in Europe and Asia from the earliest recorded times. This "horn" comes from the creature known as a unicorn , also known in the Hebrew Bible as a re'em or wild ox. [ 2 ] Many healing powers and antidotal virtues were attr... | https://en.wikipedia.org/wiki/Unicorn_horn |
Unidentified decedent , or unidentified person (also abbreviated as UID or UP ), is a corpse of a person whose identity cannot be established by police and medical examiners. In many cases, it is several years before the identities of some UIDs are found, while in some cases, they are never identified. [ 1 ] A UID may ... | https://en.wikipedia.org/wiki/Unidentified_decedent |
The unidentified infrared emission (UIR or UIE) bands are infrared discrete emissions from circumstellar regions, interstellar media, star-forming regions and extragalactic objects for which the identity of the emitting materials is unknown. The main infrared features occur around 3.3, 6.2, 7.7, 8.6, 11.2, and 12.7 μm,... | https://en.wikipedia.org/wiki/Unidentified_infrared_emission |
In logic and computer science , specifically automated reasoning , unification is an algorithmic process of solving equations between symbolic expressions , each of the form Left-hand side = Right-hand side . For example, using x , y , z as variables, and taking f to be an uninterpreted function , the singleton equatio... | https://en.wikipedia.org/wiki/Unification_(computer_science) |
Unification of theories about observable fundamental phenomena of nature is one of the primary goals of physics . [ 1 ] [ 2 ] [ 3 ] The two great unifications to date are Isaac Newton ’s unification of gravity and astronomy, and James Clerk Maxwell ’s unification of electromagnetism ; the latter has been further unifie... | https://en.wikipedia.org/wiki/Unification_of_theories_in_physics |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.