text stringlengths 11 320k | source stringlengths 26 161 |
|---|---|
In mathematics and the field of number theory , the Landau–Ramanujan constant is the positive real number b that occurs in a theorem proved by Edmund Landau in 1908, [ 1 ] stating that for large x {\displaystyle x} , the number of positive integers below x {\displaystyle x} that are the sum of two square numbers behave... | https://en.wikipedia.org/wiki/Landau–Ramanujan_constant |
In fluid dynamics , Landau–Squire jet or Submerged Landau jet describes a round submerged jet issued from a point source of momentum into an infinite fluid medium of the same kind. This is an exact solution to the incompressible form of the Navier-Stokes equations, which was first discovered by Lev Landau in 1944 [ 1 ]... | https://en.wikipedia.org/wiki/Landau–Squire_jet |
The Landau–Zener formula is an analytic solution to the equations of motion governing the transition dynamics of a two-state quantum system , with a time-dependent Hamiltonian varying such that the energy separation of the two states is a linear function of time. The formula, giving the probability of a diabatic (not a... | https://en.wikipedia.org/wiki/Landau–Zener_formula |
In physics, Landau–de Gennes theory describes the NI transition, i.e., phase transition between nematic liquid crystals and isotropic liquids, which is based on the classical Landau's theory and was developed by Pierre-Gilles de Gennes in 1969. [ 1 ] [ 2 ] The phenomonological theory uses the Q {\displaystyle \mathbf {... | https://en.wikipedia.org/wiki/Landau–de_Gennes_theory |
In number theory , the Lander, Parkin, and Selfridge conjecture concerns the integer solutions of equations which contain sums of like powers . The equations are generalisations of those considered in Fermat's Last Theorem . The conjecture is that if the sum of some k -th powers equals the sum of some other k -th powe... | https://en.wikipedia.org/wiki/Lander,_Parkin,_and_Selfridge_conjecture |
Landfarming is an ex situ waste treatment process that is performed in the upper soil zone or in biotreatment cells. Contaminated soils , sediments , or sludges are transported to the landfarming site, mixed into the soil surface and periodically turned over ( tilled ) to aerate the mixture. [ 1 ] Landfarming commonly ... | https://en.wikipedia.org/wiki/Landfarming |
Landfill gas is a mix of different gases created by the action of microorganisms within a landfill as they decompose organic waste , including for example, food waste and paper waste . Landfill gas is approximately forty to sixty percent methane , with the remainder being mostly carbon dioxide . Trace amounts of other ... | https://en.wikipedia.org/wiki/Landfill_gas |
A landfill liner , or composite liner , is intended to be a low permeable barrier, which is laid down under engineered landfill sites. Until it deteriorates, the liner retards migration of leachate , and its toxic constituents, into underlying aquifers or nearby rivers from causing potentially irreversible contaminatio... | https://en.wikipedia.org/wiki/Landfill_liner |
A landlord's gas safety certificate , also referred to as the landlord's gas safety record , is required by law to be held for all rental accommodation in the UK where there are gas appliances present. The requirement is enshrined in the Gas Safety (Installation and Use) Regulations 1998 . The law requires all gas appl... | https://en.wikipedia.org/wiki/Landlord's_gas_safety_certificate |
Landolt–Börnstein is a collection of property data in materials science and the closely related fields of chemistry , physics and engineering published by Springer Nature . [ 1 ] [ 2 ] [ 3 ]
On July 28, 1882, Dr. Hans Heinrich Landolt and Dr. Richard Börnstein , both professors at the " Landwirtschaftliche Hochschule ... | https://en.wikipedia.org/wiki/Landolt–Börnstein |
Landomycins are angucycline antibiotics isolated from Streptomyces .
This organic chemistry article is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/Landomycins |
A landrace is a domesticated , locally adapted, [ 2 ] [ 3 ] [ 4 ] often traditional [ 5 ] variety of a species of animal or plant that has developed over time, through adaptation to its natural and cultural environment of agriculture and pastoralism , and due to isolation from other populations of the species. [ 2 ] La... | https://en.wikipedia.org/wiki/Landrace |
Landscape architecture is the design of outdoor areas, landmarks , and structures to achieve environmental, social-behavioural, or aesthetic outcomes. [ 2 ] It involves the systematic design and general engineering of various structures for construction and human use, investigation of existing social, ecological, and s... | https://en.wikipedia.org/wiki/Landscape_architecture |
Landscape ecology is the science of studying and improving relationships between ecological processes in the environment and particular ecosystems. This is done within a variety of landscape scales, development spatial patterns, and organizational levels of research and policy. [ 1 ] [ 2 ] [ 3 ] Landscape ecology can b... | https://en.wikipedia.org/wiki/Landscape_ecology |
Landscape epidemiology draws some of its roots from the field of landscape ecology . [ 1 ] Just as the discipline of landscape ecology is concerned with analyzing both patterns and processes in ecosystems across time and space, landscape epidemiology can be used to analyze both risk patterns and environmental risk fact... | https://en.wikipedia.org/wiki/Landscape_epidemiology |
Landscape limnology is the spatially explicit study of lakes , streams , and wetlands as they interact with freshwater, terrestrial, and human landscapes to determine the effects of pattern on ecosystem processes across temporal and spatial scales. Limnology is the study of inland water bodies inclusive of rivers, lake... | https://en.wikipedia.org/wiki/Landscape_limnology |
A landship is a large land vehicle that travels exclusively on land. Its name is meant to distinguish it from vehicles that travel through other mediums such as conventional ships , airships , and spaceships .
The British Landship Committee formed during World War I to develop armored vehicles for use in trench warfar... | https://en.wikipedia.org/wiki/Landship |
Landslides , also known as landslips , skyfalls or rockslides , [ 3 ] [ 4 ] [ 5 ] are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls , mudflows , shallow or deep-seated slope failures and debris flows . [ 6 ] Landslides occur in a variety of environments, characterize... | https://en.wikipedia.org/wiki/Landslide |
Landsupport (spelling: LANDSUPPORT) is a pilot consulting project funded by the European Union for land use for the near-natural modeling of different types and methods of land use while at the same time protecting the environment. [ 1 ] [ 2 ]
In the long term, sustainable use of the soil must be guaranteed in order t... | https://en.wikipedia.org/wiki/Landsupport |
In physics , the Landé g -factor is a particular example of a g -factor , namely for an electron with both spin and orbital angular momenta . It is named after Alfred Landé , who first described it in 1921. [ 1 ]
In atomic physics , the Landé g -factor is a multiplicative term appearing in the expression for the energ... | https://en.wikipedia.org/wiki/Landé_g-factor |
Lane Wyatt Martin is an American materials scientist and engineer specializing in complex oxide thin films, their physics and properties, and applications of the same. He is best known for his work on ferroelectric and multiferroic thin films. Currently he is a Robert A. Welch Professor of Materials Science and NanoEng... | https://en.wikipedia.org/wiki/Lane_W._Martin |
In road-transport terminology, lane centering , also known as lane centering assist , lane assist , auto steer or autosteer , is an advanced driver-assistance system that keeps a road vehicle centered in the lane, relieving the driver of the task of steering. Lane centering is similar to lane departure warning and lane... | https://en.wikipedia.org/wiki/Lane_centering |
In road-transport terminology, a lane departure warning system ( LDWS ) is a mechanism designed to warn the driver when the vehicle begins to move out of its lane (unless a turn signal is on in that direction) on freeways and arterial roads . These systems are designed to minimize accidents by addressing the main cause... | https://en.wikipedia.org/wiki/Lane_departure_warning_system |
The Lane hydrogen producer was an apparatus for hydrogen production based on the steam-iron process and water gas [ 1 ] invented in 1903 [ 2 ] by a British engineer, Howard Lane.
The first commercial Lane hydrogen producer was commissioned in 1904. By 1913, 850,000,000 cubic feet (24,000,000 m 3 ) of hydrogen was manu... | https://en.wikipedia.org/wiki/Lane_hydrogen_producer |
In astrophysics , the Lane–Emden equation is a dimensionless form of Poisson's equation for the gravitational potential of a Newtonian self-gravitating, spherically symmetric, polytropic fluid. It is named after astrophysicists Jonathan Homer Lane and Robert Emden . [ 1 ] The equation reads
1 ξ 2 d d ξ ( ξ 2 d θ d ξ )... | https://en.wikipedia.org/wiki/Lane–Emden_equation |
The Lang Factor is an estimated ratio of the total cost of creating a process within a plant, to the cost of all major technical components. It is widely used in industrial engineering to calculate the capital and operating costs of a plant. [ 1 ] [ 2 ] [ 3 ]
The factors were introduced by H. J. Lang and Dr Micheal Bi... | https://en.wikipedia.org/wiki/Lang_factor |
In algebraic geometry , Lange's conjecture is a theorem about stability of vector bundles over curves, introduced by Herbet Lange [ de ] [ 1 ] and proved by Montserrat Teixidor i Bigas and Barbara Russo in 1999.
Let C be a smooth projective curve of genus greater or equal to 2. For generic vector bundles E 1 {\display... | https://en.wikipedia.org/wiki/Lange's_conjecture |
The Langendorff heart or isolated perfused heart assay is an ex vivo technique used in pharmacological and physiological research using animals and also humans. [ 1 ] Named after the German physiologist Oskar Langendorff , this technique allows the examination of cardiac contractile strength and heart rate without the ... | https://en.wikipedia.org/wiki/Langendorff_heart |
The Langer correction , named after the mathematician Rudolf Ernest Langer , is a correction to the WKB approximation for problems with radial symmetry.
When applying WKB approximation method to the radial Schrödinger equation , − ℏ 2 2 m d 2 R ( r ) d r 2 + [ E − V eff ( r ) ] R ( r ) = 0 , {\displaystyle -{\frac {\h... | https://en.wikipedia.org/wiki/Langer_correction |
3C22 , 3KQG , 3P5D , 3P5E , 3P5F , 3P5G , 3P5H , 3P5I , 3P7F , 3P7G , 3P7H , 4AK8 , 4N32 , 4N33 , 4N34 , 4N35 , 4N36 , 4N37 , 4N38
50489
246278
ENSG00000116031
ENSMUSG00000034783
Q9UJ71
Q8VBX4
NM_015717
NM_144943
NP_056532
NP_659192
Langerin ( CD207 ) is a type II transmembrane protein which is encoded by th... | https://en.wikipedia.org/wiki/Langerin |
In physics , Langevin dynamics is an approach to the mathematical modeling of the dynamics of molecular systems using the Langevin equation . It was originally developed by French physicist Paul Langevin . The approach is characterized by the use of simplified models while accounting for omitted degrees of freedom by t... | https://en.wikipedia.org/wiki/Langevin_dynamics |
Langgan ( Chinese : 琅玕 ; pinyin : lánggān ) is the ancient Chinese name of a gemstone which remains an enigma in the history of mineralogy ; it has been identified, variously, as blue-green malachite , blue coral , white coral , whitish chalcedony , red spinel , and red jade . It is also the name of a mythological lang... | https://en.wikipedia.org/wiki/Langgan |
Langhans giant cells (LGC) are giant cells found in granulomatous conditions.
They are formed by the fusion of epithelioid cells ( macrophages ), and contain nuclei arranged in a horseshoe-shaped pattern in the cell periphery. [ 1 ]
Although traditionally their presence was associated with tuberculosis , they are not... | https://en.wikipedia.org/wiki/Langhans_giant_cell |
Langley's Adventitious Angles is a puzzle in which one must infer an angle in a geometric diagram from other given angles. It was posed by Edward Mann Langley in The Mathematical Gazette in 1922. [ 1 ] [ 2 ]
In its original form the problem was as follows:
The problem of calculating angle ∠ B E F {\displaystyle \angl... | https://en.wikipedia.org/wiki/Langley's_Adventitious_Angles |
Langmuir is a peer-reviewed scientific journal that was established in 1985 and is published by the American Chemical Society . It is the leading journal focusing on the science and application of systems and materials in which the interface dominates structure and function. Research areas covered include surface and c... | https://en.wikipedia.org/wiki/Langmuir_(journal) |
The langmuir (symbol: L ) is a unit of exposure (or dosage) to a surface ( e.g. of a crystal ) and is used in ultra-high vacuum (UHV) surface physics to study the adsorption of gases . It is a practical unit, and is not dimensionally homogeneous , and so is used only in this field. It is named after American physicist ... | https://en.wikipedia.org/wiki/Langmuir_(unit) |
The Langmuir adsorption model explains adsorption by assuming an adsorbate behaves as an ideal gas at isothermal conditions. According to the model, adsorption and desorption are reversible processes. This model even explains the effect of pressure; i.e. , at these conditions the adsorbate 's partial pressure p A {\dis... | https://en.wikipedia.org/wiki/Langmuir_adsorption_model |
A Langmuir probe is a device used to determine the electron temperature, electron density, and electric potential of a plasma . It works by inserting one or more electrodes into a plasma, with a constant or time-varying electric potential between the various electrodes or between them and the surrounding vessel. The me... | https://en.wikipedia.org/wiki/Langmuir_probe |
In quantum mechanics Langmuir states are certain quantum states of Helium that in the classical limit correspond to two parallel circular orbits of electrons one above the other and with the nucleus in between. [ 1 ] They are constructed in analogy to circular states of Hydrogen when the
electron has the maximum angul... | https://en.wikipedia.org/wiki/Langmuir_states |
In fluid dynamics , and oceanography , Langmuir turbulence is a turbulent flow with coherent Langmuir circulation structures that exist and evolve over a range of spatial and temporal scales. [ 1 ] These structures arise through an interaction between the ocean surface waves and the currents.
In the upper ocean Langmu... | https://en.wikipedia.org/wiki/Langmuir_turbulence |
A Langmuir–Blodgett (LB) film is an emerging kind of 2D materials to fabricate heterostructures for nanotechnology, formed when Langmuir films—or Langmuir monolayers (LM)—are transferred from the liquid-gas interface to solid supports during the vertical passage of the support through the monolayers. LB films can cont... | https://en.wikipedia.org/wiki/Langmuir–Blodgett_film |
A Langmuir–Taylor detector , also called surface ionization detector or hot wire detector , is a kind of ionization detector used in mass spectrometry , developed by John Taylor [ 1 ] based on the work of Irving Langmuir and K. H. Kingdon . [ 2 ]
This detector usually consists of a heated thin filament or ribbon of a ... | https://en.wikipedia.org/wiki/Langmuir–Taylor_detector |
In computer science , language-based security ( LBS ) is a set of techniques that may be used to strengthen the security of applications on a high level by using the properties of programming languages.
LBS is considered to enforce computer security on an application-level, making it possible to prevent vulnerabilities... | https://en.wikipedia.org/wiki/Language-based_security |
Language engineering involves the creation of natural language processing systems, whose cost and outputs are measurable and predictable. [ citation needed ] It is a distinct field contrasted to natural language processing and computational linguistics . [ 1 ] A recent trend of language engineering is the use of Semant... | https://en.wikipedia.org/wiki/Language_engineering |
Language equations are mathematical statements that resemble numerical equations , but the variables assume values of formal languages rather than numbers. Instead of arithmetic operations in numerical equations, the variables are joined by language operations. Among the most common operations on two languages A and B ... | https://en.wikipedia.org/wiki/Language_equation |
A language workbench [ 1 ] [ 2 ] is a tool or set of tools that enables software development in the language-oriented programming [ 2 ] software development paradigm. A language workbench will typically include tools to support the definition, reuse and composition of domain-specific languages together with their integ... | https://en.wikipedia.org/wiki/Language_workbench |
Slightly over half of the homepages of the most visited websites on the World Wide Web are in English, with varying amounts of information available in many other languages. [ 1 ] [ 2 ] Other top languages are Chinese, Spanish, Russian, Persian, French, German and Japanese. [ 1 ] [ 3 ]
Of the more than 7,000 existing ... | https://en.wikipedia.org/wiki/Languages_used_on_the_Internet |
The Laniakea Supercluster ( / ˌ l ɑː n i . ə ˈ k eɪ . ə / ; Hawaiian for "open skies" or "immense heaven") [ 2 ] or the Local Supercluster ( LSC or LS ) is the galaxy supercluster that is home to the Milky Way and approximately 100,000 other nearby galaxies.
It was defined in September 2014, when a group of astronomer... | https://en.wikipedia.org/wiki/Laniakea_Supercluster |
1W6J , 1W6K
4047
16987
ENSG00000160285 ENSG00000281289
ENSMUSG00000033105
P48449
Q8BLN5
NM_001001438 NM_001145436 NM_001145437 NM_002340
NM_146006
NP_001001438 NP_001138908 NP_001138909 NP_002331
NP_666118
Lanosterol synthase ( EC 5.4.99.7 ) is an oxidosqualene cyclase (OSC) enzyme that converts ( S )-2,3-ox... | https://en.wikipedia.org/wiki/Lanosterol_synthase |
Lansweeper is an IT discovery & inventory platform which delivers insights into the status of users, devices, and software within IT environments. This platform inventories connected IT devices, enabling organizations to centrally manage their IT infrastructure . Lansweeper's automated processes identify and compile a ... | https://en.wikipedia.org/wiki/Lansweeper |
The lanthanide ( / ˈ l æ n θ ə n aɪ d / ) or lanthanoid ( / ˈ l æ n θ ə n ɔɪ d / ) series of chemical elements [ a ] comprises at least the 14 metallic chemical elements with atomic numbers 57–70, from lanthanum through ytterbium . In the periodic table, they fill the 4f orbitals. [ 2 ] [ 3 ] [ 4 ] Lutetium (element 71... | https://en.wikipedia.org/wiki/Lanthanide |
The lanthanide contraction is the greater-than-expected decrease in atomic radii and ionic radii of the elements in the lanthanide series, from left to right. It is caused by the poor shielding effect of nuclear charge by the 4f electrons along with the expected periodic trend of increasing electronegativity and nuclea... | https://en.wikipedia.org/wiki/Lanthanide_contraction |
Lanthanide probes are a non-invasive [ 1 ] analytical tool commonly used for biological and chemical applications. Lanthanides are metal ions which have their 4f energy level filled and generally refer to elements cerium to lutetium in the periodic table . [ 2 ] The fluorescence of lanthanide salts is weak because the ... | https://en.wikipedia.org/wiki/Lanthanide_probes |
Lanthanum(III) iodide is an inorganic compound containing lanthanum and iodine with the chemical formula LaI 3 . [ 1 ]
Lanthanum(III) iodide can be synthesised by the reaction of lanthanum metal with mercury(II) iodide : [ 2 ] [ 3 ]
It can also be prepared from the elements, that is by the reaction of metallic lantha... | https://en.wikipedia.org/wiki/Lanthanum(III)_iodide |
Lanthanum forms several alloys with nickel , including LaNi 5 , La 2 Ni 7 , LaNi 2 , LaNi 3 , La 2 Ni 3 , LaNi and La 3 Ni etc. [ 1 ]
LaNi 5 is an intermetallic compound with a CaCu 5 structure. It belongs to the hexagonal crystal system. [ 4 ] It can be oxidized by air above 200 °C, and react with hydrochloric acid ,... | https://en.wikipedia.org/wiki/Lanthanum-nickel_alloy |
Lanthanum acetate is an inorganic compound , a salt of lanthanum with acetic acid with the chemical formula La(CH 3 CO 2 ) 3 . According to X-ray crystallography , anhydrous lanthanum acetate is a coordination polymer . Each La(III) center is nine-coordinate, with two bidentate acetate ligands and the remaining sites ... | https://en.wikipedia.org/wiki/Lanthanum_acetate |
Lanthanum aluminate is an inorganic compound with the formula LaAlO 3 , often abbreviated as LAO . It is an optically transparent ceramic oxide with a distorted perovskite structure .
Crystalline LaAlO 3 has a relatively high relative dielectric constant of ~25. LAO's crystal structure is a rhombohedral distorted pero... | https://en.wikipedia.org/wiki/Lanthanum_aluminate |
The interface between lanthanum aluminate (LaAlO 3 ) and strontium titanate (SrTiO 3 ) is a notable materials interface because it exhibits properties not found in its constituent materials. Individually, LaAlO 3 and SrTiO 3 are non-magnetic insulators , yet LaAlO 3 /SrTiO 3 interfaces can exhibit electrical metallic c... | https://en.wikipedia.org/wiki/Lanthanum_aluminate-strontium_titanate_interface |
Lanthanum cuprate usually refers to the inorganic compound with the formula CuLa 2 O 4 . The name implies that the compound consists of a cuprate ([CuO n ] 2n- ) salt of lanthanum (La 3+ ). In fact it is a highly covalent solid. It is prepared by high temperature reaction of lanthanum oxide and copper(II) oxide foll... | https://en.wikipedia.org/wiki/Lanthanum_cuprate |
Lanthanum hydroxide is La(OH) 3 , a hydroxide of the rare-earth element lanthanum .
Lanthanum hydroxide can be obtained by adding an alkali such as ammonia to aqueous solutions of lanthanum salts such as lanthanum nitrate . This produces a gel-like precipitate that can then be dried in air. [ 2 ]
Alternatively, it c... | https://en.wikipedia.org/wiki/Lanthanum_hydroxide |
Lanthanum oxalate is an inorganic compound , a salt of lanthanum metal and oxalic acid with the chemical formula La 2 (C 2 O 4 ) 3 . [ 1 ] [ 2 ]
Reaction of soluble lanthanum nitrate with an excess of oxalic acid :
Also, a reaction of lanthanum chloride with oxalic acid :
Lanthanum(III) oxalate forms colorless cryst... | https://en.wikipedia.org/wiki/Lanthanum_oxalate |
Lanthanum(III) oxide , also known as lanthana , chemical formula La 2 O 3 , is an inorganic compound containing the rare earth element lanthanum and oxygen . It is used in some ferroelectric materials, as a component of optical materials, and is a feedstock for certain catalysts, among other uses.
Lanthanum oxide is a... | https://en.wikipedia.org/wiki/Lanthanum_oxide |
LaNi 5 is a hexagonal intermetallic compound composed of rare earth element lanthanum and transition metal nickel . It presents a calcium pentacopper (CaCu 5 ) crystal structure. It is a melting compound with the same composition and has hydrogen storage capacity. [ 3 ]
LaNi 5 has a calcium pentacopper (CaCu 5 ) type ... | https://en.wikipedia.org/wiki/Lanthanum_pentanickel |
Lanthanum strontium cobalt ferrite ( LSCF ), also called lanthanum strontium cobaltite ferrite is a specific ceramic oxide derived from lanthanum cobaltite of the ferrite group. It is a phase containing lanthanum(III) oxide , strontium oxide , cobalt oxide and iron oxide with the formula La x Sr 1− x Co y Fe 1− y O 3 ,... | https://en.wikipedia.org/wiki/Lanthanum_strontium_cobalt_ferrite |
In mathematics , Laplace's method , named after Pierre-Simon Laplace , is a technique used to approximate integrals of the form
where f {\displaystyle f} is a twice- differentiable function , M {\displaystyle M} is a large number , and the endpoints a {\displaystyle a} and b {\displaystyle b} could be infinite. This t... | https://en.wikipedia.org/wiki/Laplace's_method |
Irrotational flow occurs where the curl of the velocity of the fluid is zero everywhere. That is when ∇ × v → = 0 {\displaystyle \nabla \times {\vec {v}}=0}
Similarly, if it is assumed that the fluid is incompressible: ρ ( x , y , z , t ) = ρ (a constant) {\displaystyle \rho (x,y,z,t)=\rho {\text{ (a constant)}}}
The... | https://en.wikipedia.org/wiki/Laplace_equation_for_irrotational_flow |
In linear algebra , the Laplace expansion , named after Pierre-Simon Laplace , also called cofactor expansion , is an expression of the determinant of an n × n - matrix B as a weighted sum of minors , which are the determinants of some ( n − 1) × ( n − 1) - submatrices of B . Specifically, for every i , the Laplace exp... | https://en.wikipedia.org/wiki/Laplace_expansion |
In differential equations , the Laplace invariant of any of certain differential operators is a certain function of the coefficients and their derivatives . Consider a bivariate hyperbolic differential operator of the second order
whose coefficients
are smooth functions of two variables. Its Laplace invariants have... | https://en.wikipedia.org/wiki/Laplace_invariant |
In mathematics , the Laplace limit is the maximum value of the eccentricity for which a solution to Kepler's equation , in terms of a power series in the eccentricity, converges. It is approximately
Kepler's equation M = E − ε sin E relates the mean anomaly M with the eccentric anomaly E for a body moving in an ellips... | https://en.wikipedia.org/wiki/Laplace_limit |
The Laplace number ( La ), also known as the Suratman number ( Su ), is a dimensionless number used in the characterization of free surface fluid dynamics . It represents a ratio of surface tension to the momentum -transport (especially dissipation ) inside a fluid. It is named after Pierre-Simon Laplace and Indonesia... | https://en.wikipedia.org/wiki/Laplace_number |
In mathematics , the Laplace operator or Laplacian is a differential operator given by the divergence of the gradient of a scalar function on Euclidean space . It is usually denoted by the symbols ∇ ⋅ ∇ {\displaystyle \nabla \cdot \nabla } , ∇ 2 {\displaystyle \nabla ^{2}} (where ∇ {\displaystyle \nabla } is the nabla ... | https://en.wikipedia.org/wiki/Laplace_operator |
The Laplace pressure is the pressure difference between the inside and the outside of a curved surface that forms the boundary between two fluid regions. [ 1 ] The pressure difference is caused by the surface tension of the interface between liquid and gas, or between two immiscible liquids.
The Laplace pressure is de... | https://en.wikipedia.org/wiki/Laplace_pressure |
In mathematics , Laplace's principle is a basic theorem in large deviations theory which is similar to Varadhan's lemma . It gives an asymptotic expression for the Lebesgue integral of exp(− θφ ( x )) over a fixed set A as θ becomes large. Such expressions can be used, for example, in statistical mechanics to determini... | https://en.wikipedia.org/wiki/Laplace_principle_(large_deviations_theory) |
In astronomy and orbital mechanics , the Laplace sphere concerns a specific kind of Three-body problem with orbits. The prototype idea is to study the Sun - Earth - Moon system, and determine if it would be possible for the Sun to steal away the Moon from Earth orbit, into solar orbit. More generally, it is applied t... | https://en.wikipedia.org/wiki/Laplace_sphere |
In mathematics , the Laplace transform is a powerful integral transform used to switch a function from the time domain to the s-domain . The Laplace transform can be used in some cases to solve linear differential equations with given initial conditions .
First consider the following property of the Laplace transform:... | https://en.wikipedia.org/wiki/Laplace_transform_applied_to_differential_equations |
In mathematics, the Laplace–Carson transform , named after Pierre Simon Laplace and John Renshaw Carson , is an integral transform with significant applications in the field of physics and engineering, particularly in the field of railway engineering .
Let V ( j , t ) {\displaystyle V(j,t)} be a function and p {\displ... | https://en.wikipedia.org/wiki/Laplace–Carson_transform |
In the mathematical field of graph theory , the Laplacian matrix , also called the graph Laplacian , admittance matrix , Kirchhoff matrix, or discrete Laplacian , is a matrix representation of a graph . Named after Pierre-Simon Laplace , the graph Laplacian matrix can be viewed as a matrix form of the negative discrete... | https://en.wikipedia.org/wiki/Laplacian_matrix |
In potential theory (a branch of mathematics ), the Laplacian of the indicator is obtained by letting the Laplace operator work on the indicator function of some domain D . It is a generalisation of the derivative (or "prime function") of the Dirac delta function to higher dimensions ; it is non-zero only on the surfac... | https://en.wikipedia.org/wiki/Laplacian_of_the_indicator |
Laplacian smoothing is an algorithm to smooth a polygonal mesh . [ 1 ] [ 2 ] For each vertex in a mesh, a new position is chosen based on local information (such as the position of neighbours) and the vertex is moved there. In the case that a mesh is topologically a rectangular grid (that is, each internal vertex is co... | https://en.wikipedia.org/wiki/Laplacian_smoothing |
The south bank of the Humber Estuary in England is a relatively unpopulated area containing large scale industrial development built from the 1950s onward, including national scale petroleum and chemical plants as well as gigawatt scale gas fired power stations.
Historically the south bank was undeveloped, and mostly ... | https://en.wikipedia.org/wiki/Laporte_"Battery_Works",_Stallingborough |
In signal processing , a lapped transform is a type of linear discrete block transformation where the basis functions of the transformation overlap the block boundaries, yet the number of coefficients overall resulting from a series of overlapping block transforms remains the same as if a non-overlapping block transfor... | https://en.wikipedia.org/wiki/Lapped_transform |
Laptop theft (or notebook theft ) is a significant threat to users of laptop computers. Many methods to protect the data and to prevent theft have been developed, including alarms, laptop locks, and visual deterrents such as stickers or labels. Victims of laptop theft can lose hardware, software, and essential data tha... | https://en.wikipedia.org/wiki/Laptop_theft |
LAR1 ('Lichen-Associated Rhizobiales 1') refers to a specific bacterial lineage in the order Hyphomicrobiales (formerly Rhizobiales) that has most frequently been found directly in association with lichens . [ 1 ]
This lineage is currently known to associate with lichens that have a green-algal photosynthetic partner ... | https://en.wikipedia.org/wiki/Lar1 |
The chemical companies of the large-scale chemical synthesis in Poland ( Polish : Wielka synteza chemiczna ) at the beginning of the 21st century, underwent the a process of intensive reorganization. [ 1 ]
Since the majority of entities in the sector of great chemical synthesis was owned by State Treasury at that time... | https://en.wikipedia.org/wiki/Large-scale_chemical_synthesis_in_Poland |
Large-signal modeling is a common analysis method used in electronic engineering to describe nonlinear devices in terms of the underlying nonlinear equations. In circuits containing nonlinear elements such as transistors , diodes , and vacuum tubes , under "large signal conditions", AC signals have high enough magnitud... | https://en.wikipedia.org/wiki/Large-signal_model |
The Large Angle and Spectrometric Coronagraph ( LASCO ) on board the Solar and Heliospheric Observatory satellite (SOHO) consists of three solar coronagraphs with nested fields of view: [ 1 ]
The first principal investigator was Dr. Guenter Brueckner . These coronagraphs monitor the solar corona by using an optical sy... | https://en.wikipedia.org/wiki/Large_Angle_and_Spectrometric_Coronagraph |
Large Interferometer For Exoplanets ( LIFE ) is a project started in 2017 to develop the science, technology and a roadmap for a space mission to detect and characterize the atmospheres of dozens of warm, terrestrial extrasolar planets . The current plan is for a nulling interferometer operating in the mid-infrared . [... | https://en.wikipedia.org/wiki/Large_Interferometer_For_Exoplanets |
The Large Molecule Heimat is a dense gas cloud located in the molecular cloud Sagittarius B2 . [ 2 ] Many species of molecule, including aminoacetonitrile (a molecule related to glycine ), ethyl formate , [ 3 ] and butyronitrile , [ 3 ] have been detected in the Large Molecule Heimat. [ 2 ] [ 4 ]
This nebula-related a... | https://en.wikipedia.org/wiki/Large_Molecule_Heimat |
The Large-Scale Concept Ontology for Multimedia project was a series of workshops held from April 2004 to September 2006 [ 1 ] for the purpose of defining a standard formal vocabulary for the annotation and retrieval of video.
The Large-Scale Concept Ontology for Multimedia project was sponsored by the Disruptive Tech... | https://en.wikipedia.org/wiki/Large_Scale_Concept_Ontology_for_Multimedia |
The Large Ultraviolet Optical Infrared Surveyor , commonly known as LUVOIR ( / l uː ˈ v w ɑːr / ), is a multi-wavelength space telescope concept being developed by NASA under the leadership of a Science and Technology Definition Team . It is one of four large astrophysics space mission concepts studied in preparation f... | https://en.wikipedia.org/wiki/Large_Ultraviolet_Optical_Infrared_Surveyor |
Large deformation diffeomorphic metric mapping ( LDDMM ) is a specific suite of algorithms used for diffeomorphic mapping and manipulating dense imagery based on diffeomorphic metric mapping within the academic discipline of computational anatomy , to be distinguished from its precursor based on diffeomorphic mapping .... | https://en.wikipedia.org/wiki/Large_deformation_diffeomorphic_metric_mapping |
Large dense core vesicle (LDCVs) are lipid vesicles in neurons and secretory cells which may be filled with neurotransmitters , such as catecholamines or neuropeptides . LDVCs release their content through SNARE -mediated exocytosis similar to synaptic vesicles . [ 1 ] One key difference between synaptic vesicles and L... | https://en.wikipedia.org/wiki/Large_dense_core_vesicles |
Large eddy simulation ( LES ) is a mathematical model for turbulence used in computational fluid dynamics . It was initially proposed in 1963 by Joseph Smagorinsky to simulate atmospheric air currents, [ 1 ] and first explored by Deardorff (1970). [ 2 ] LES is currently applied in a wide variety of engineering applicat... | https://en.wikipedia.org/wiki/Large_eddy_simulation |
Large numbers , far beyond those encountered in everyday life—such as simple counting or financial transactions—play a crucial role in various domains. These expansive quantities appear prominently in mathematics , cosmology , cryptography , and statistical mechanics . While they often manifest as large positive intege... | https://en.wikipedia.org/wiki/Large_numbers |
In Ramsey theory , a set S of natural numbers is considered to be a large set if and only if Van der Waerden's theorem can be generalized to assert the existence of arithmetic progressions with common difference in S . That is, S is large if and only if every finite partition of the natural numbers has a cell containi... | https://en.wikipedia.org/wiki/Large_set_(Ramsey_theory) |
Large woody debris ( LWD ) are the logs, sticks, branches, and other wood that falls into streams and rivers . This debris can influence the flow and the shape of the stream channel. Large woody debris, grains, and the shape of the bed of the stream are the three main providers of flow resistance, and are thus a majo... | https://en.wikipedia.org/wiki/Large_woody_debris |
The history of life on Earth seems to show a clear trend; for example, it seems intuitive that there is a trend towards increasing complexity in living organisms. More recently evolved organisms, such as mammals , appear to be much more complex than organisms, such as bacteria , which have existed for a much longer per... | https://en.wikipedia.org/wiki/Largest-scale_trends_in_evolution |
There have been many extremely large explosions, accidental and intentional, caused by modern high explosives , boiling liquid expanding vapour explosions (BLEVEs), older explosives such as gunpowder , volatile petroleum -based fuels such as petrol , and other chemical reactions. This list contains the largest known ex... | https://en.wikipedia.org/wiki/Largest_artificial_non-nuclear_explosions |
In physics , Larmor precession (named after Joseph Larmor ) is the precession of the magnetic moment of an object about an external magnetic field . The phenomenon is conceptually similar to the precession of a tilted classical gyroscope in an external torque-exerting gravitational field. Objects with a magnetic momen... | https://en.wikipedia.org/wiki/Larmor_precession |
The Larock indole synthesis is a hetero annulation reaction that uses palladium as a catalyst to synthesize indoles from an ortho-iodo aniline and a disubstituted alkyne . [ 1 ] It is also known as Larock hetero annulation . The reaction is extremely versatile and can be used to produce varying types of indoles. Larock... | https://en.wikipedia.org/wiki/Larock_indole_synthesis |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.