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Q-Chem is a general-purpose electronic structure package [ 1 ] [ 2 ] [ 3 ] [ 4 ] featuring a variety of established and new methods implemented using innovative algorithms that enable fast calculations of large systems on various computer architectures, from laptops and regular lab workstations to midsize clusters, HPC... | https://en.wikipedia.org/wiki/Q-Chem |
The q -Gaussian is a probability distribution arising from the maximization of the Tsallis entropy under appropriate constraints. It is one example of a Tsallis distribution . The q -Gaussian is a generalization of the Gaussian in the same way that Tsallis entropy is a generalization of standard Boltzmann–Gibbs entrop... | https://en.wikipedia.org/wiki/Q-Gaussian_distribution |
CubeSat Particle Aggregation and Collision Experiment ( Q-PACE ) or Cu-PACE , [ 4 ] was an orbital spacecraft mission that would have studied the early stages of proto-planetary accretion by observing particle dynamical aggregation for several years. [ 5 ]
Current hypotheses have trouble explaining how particles can g... | https://en.wikipedia.org/wiki/Q-PACE |
In the mathematical field of combinatorics , the q -Pochhammer symbol , also called the q -shifted factorial , is the product ( a ; q ) n = ∏ k = 0 n − 1 ( 1 − a q k ) = ( 1 − a ) ( 1 − a q ) ( 1 − a q 2 ) ⋯ ( 1 − a q n − 1 ) , {\displaystyle (a;q)_{n}=\prod _{k=0}^{n-1}(1-aq^{k})=(1-a)(1-aq)(1-aq^{2})\cdots (1-aq^{n-1... | https://en.wikipedia.org/wiki/Q-Pochhammer_symbol |
In mathematics , in the field of combinatorics , the q -Vandermonde identity is a q -analogue of the Chu–Vandermonde identity . Using standard notation for q -binomial coefficients , the identity states that
The nonzero contributions to this sum come from values of j such that the q -binomial coefficients on the righ... | https://en.wikipedia.org/wiki/Q-Vandermonde_identity |
Q-vectors are used in atmospheric dynamics to understand physical processes such as vertical motion and frontogenesis . Q-vectors are not physical quantities that can be measured in the atmosphere but are derived from the quasi-geostrophic equations and can be used in the previous diagnostic situations. On meteorologic... | https://en.wikipedia.org/wiki/Q-Vectors |
In statistics, the q -Weibull distribution is a probability distribution that generalizes the Weibull distribution and the Lomax distribution (Pareto Type II). It is one example of a Tsallis distribution .
The probability density function of a q -Weibull random variable is: [ 1 ]
where q < 2, κ {\displaystyle \kappa ... | https://en.wikipedia.org/wiki/Q-Weibull_distribution |
In mathematics , a q -analog of a theorem, identity or expression is a generalization involving a new parameter q that returns the original theorem, identity or expression in the limit as q → 1 . Typically, mathematicians are interested in q -analogs that arise naturally, rather than in arbitrarily contriving q -analo... | https://en.wikipedia.org/wiki/Q-analog |
In mathematics , in the area of combinatorics and quantum calculus , the q -derivative , or Jackson derivative , is a q -analog of the ordinary derivative , introduced by Frank Hilton Jackson . It is the inverse of Jackson's q -integration . For other forms of q-derivative, see Chung et al. (1994) .
The q -derivative ... | https://en.wikipedia.org/wiki/Q-derivative |
In combinatorial mathematics , the q -difference polynomials or q -harmonic polynomials are a polynomial sequence defined in terms of the q -derivative . They are a generalized type of Brenke polynomial , and generalize the Appell polynomials . See also Sheffer sequence .
The q-difference polynomials satisfy the rela... | https://en.wikipedia.org/wiki/Q-difference_polynomial |
The q -exponential distribution is a probability distribution arising from the maximization of the Tsallis entropy under appropriate constraints, including constraining the domain to be positive. It is one example of a Tsallis distribution . The q -exponential is a generalization of the exponential distribution in the... | https://en.wikipedia.org/wiki/Q-exponential_distribution |
In statistics , the Q-function is the tail distribution function of the standard normal distribution . [ 1 ] [ 2 ] In other words, Q ( x ) {\displaystyle Q(x)} is the probability that a normal (Gaussian) random variable will obtain a value larger than x {\displaystyle x} standard deviations. Equivalently, Q ( x ) {\dis... | https://en.wikipedia.org/wiki/Q-function |
Q-system is a genetic tool that allows to express transgenes in a living organism . [ 1 ] Originally the Q-system was developed [ 2 ] [ 3 ] for use in the vinegar fly Drosophila melanogaster , and was rapidly adapted for use in cultured mammalian cells , [ 2 ] zebrafish , [ 4 ] worms [ 5 ] and mosquitoes . [ 6 ] The Q-... | https://en.wikipedia.org/wiki/Q-system_(genetics) |
The Q 10 temperature coefficient is a measure of temperature sensitivity based on the chemical reactions.
The Q 10 is calculated as:
where;
Rewriting this equation, the assumption behind Q 10 is that the reaction rate R depends exponentially on temperature:
Q 10 is a unitless quantity, as it is the factor by which ... | https://en.wikipedia.org/wiki/Q10_(temperature_coefficient) |
The QAMA Calculator is a calculator that requires users to provide a reasonable estimate of the answer before the precise answer is delivered. [ 1 ] [ 2 ] QAMA stands for Quick Approximate Mental Arithmetic .
Invented by Ilan Samson, it aims to get users to think first by estimating before they get the correct answer.... | https://en.wikipedia.org/wiki/QAMA_Calculator |
A QA & UX Manager work with both Quality Assurance (QA) and User Experience (UX) in relation to video game and software development . QA & UX Manager can work independently or in co-operation with other QA & UX Managers, like in larger QA & UX teams with other QA & UX Managers and game testers. In the larger QA & UX te... | https://en.wikipedia.org/wiki/QA_&_UX_Manager |
Quark matter or QCD matter ( quantum chromodynamic ) refers to any of a number of hypothetical phases of matter whose degrees of freedom include quarks and gluons , of which the prominent example is quark-gluon plasma . [ 1 ] Several series of conferences in 2019, 2020, and 2021 were devoted to this topic. [ 2 ] [ 3 ] ... | https://en.wikipedia.org/wiki/QCD_matter |
QDGC - Quarter Degree Grid Cells (or QDS - Quarter degree Squares) are a way of dividing the longitude latitude degree square cells into smaller squares, forming in effect a system of geocodes . Historically QDGC has been used in a lot of African atlases. Several African biodiversity projects uses QDGC, among which The... | https://en.wikipedia.org/wiki/QDGC |
The QED vacuum or quantum electrodynamic vacuum is the field-theoretic vacuum of quantum electrodynamics . It is the lowest energy state (the ground state ) of the electromagnetic field when the fields are quantized . [ 1 ] When the Planck constant is hypothetically allowed to approach zero, QED vacuum is converted to ... | https://en.wikipedia.org/wiki/QED_vacuum |
QEMSCAN is the name for an integrated automated mineralogy and petrography system providing quantitative analysis of minerals , rocks and man-made materials. QEMSCAN is an abbreviation standing for quantitative evaluation of minerals by scanning electron microscopy , and a registered trademark owned by FEI Company sinc... | https://en.wikipedia.org/wiki/QEMSCAN |
Qivicon is an alliance of companies from different industries [ 1 ] that was founded in 2011 by Deutsche Telekom . [ 2 ] These companies collaborate on a cross-vendor wireless home automation solution that has been available in the German market since the fall of 2013. [ 3 ] It includes products in the areas of energy,... | https://en.wikipedia.org/wiki/QIVICON |
In mathematics , the QM-AM-GM-HM inequalities , also known as the mean inequality chain , state the relationship between the harmonic mean (HM), geometric mean (GM), arithmetic mean (AM), and quadratic mean (QM; also known as root mean square). Suppose that x 1 , x 2 , … , x n {\displaystyle x_{1},x_{2},\ldots ,x_{n}} ... | https://en.wikipedia.org/wiki/QM-AM-GM-HM_inequalities |
The hybrid QM/MM ( quantum mechanics / molecular mechanics ) approach is a molecular simulation method that combines the strengths of ab initio QM calculations (accuracy) and MM (speed) approaches, thus allowing for the study of chemical processes in solution and in proteins. The QM/MM approach was introduced in the 19... | https://en.wikipedia.org/wiki/QM/MM |
QMC@Home was a volunteer computing project for the BOINC client aimed at further developing and testing Quantum Monte Carlo (QMC) for use in quantum chemistry . [ 1 ] It is hosted by the University of Münster with participation by the Cavendish Laboratory . QMC@Home allows volunteers from around the world to donate idl... | https://en.wikipedia.org/wiki/QMC@Home |
QMCF Technology is an episomal protein production system that uses genetically modified mammalian cells and specially designed plasmids . QMCF plasmids carry a combination of regulatory sequences from mouse polyomavirus (Py) DNA replication origin which in combination with Epstein-Barr virus (EBV) EBNA-1 protein bindin... | https://en.wikipedia.org/wiki/QMCF_Technology |
QNX ( / ˌ k juː ˌ ɛ n ˈ ɛ k s / or / ˈ k juː n ɪ k s / ) is a commercial Unix-like real-time operating system , aimed primarily at the embedded systems market.
The product was originally developed in the early 1980s by Canadian company Quantum Software Systems, founded March 30, 1980, and later renamed QNX Software Sy... | https://en.wikipedia.org/wiki/QNX |
QPNC-PAGE , or Quantitative Preparative Native Continuous Polyacrylamide Gel Electrophoresis , is a bioanalytical , high-resolution and high-precision zone electrophoresis technique applied in biochemistry and bioinorganic chemistry to separate proteins or protein isoforms by isoelectric point and by continuous elution... | https://en.wikipedia.org/wiki/QPNC-PAGE |
A QR code, quick-response code , [ 1 ] is a type of two-dimensional matrix barcode invented in 1994 by Masahiro Hara of Japanese company Denso Wave for labelling automobile parts. [ 2 ] [ 3 ] It features black squares on a white background with fiducial markers , readable by imaging devices like cameras, and processed ... | https://en.wikipedia.org/wiki/QR_code |
Qatar Sustainability Assessment System (QSAS) is a green building certification system developed for the State of Qatar . The primary objective of Qatar Sustainability Assessment System [QSAS] is to create a sustainable built environment that minimizes ecological impact while addressing the specific regional needs and ... | https://en.wikipedia.org/wiki/QSAS |
In quantitative genetics , Q ST is a statistic intended to measure the degree of genetic differentiation among populations with regard to a quantitative trait . It was developed by Ken Spitze in 1993. [ 1 ] Its name reflects that Q ST was intended to be analogous to the fixation index for a single genetic locus (F ST )... | https://en.wikipedia.org/wiki/QST_(genetics) |
The QTY Code is a design method to transform membrane proteins that are intrinsically insoluble in water into variants with water solubility , while retaining their structure and function.
The QTY Code is based on two key molecular structural facts: 1) all 20 natural amino acids are found in alpha-helices regardless o... | https://en.wikipedia.org/wiki/QTY_Code |
QVT ( Query/View/Transformation ) is a standard set of languages for model transformation defined by the Object Management Group . [ 1 ]
Model transformation is a key technique used in model-driven architecture . As the name QVT indicates, the OMG standard covers transformations, views and queries together. Model quer... | https://en.wikipedia.org/wiki/QVT |
The Q cycle (named for quinol ) describes a series of sequential oxidation and reduction of the lipophilic electron carrier Coenzyme Q (CoQ) between the ubiquinol and ubiquinone forms. These reactions can result in the net movement of protons across a lipid bilayer (in the case of the mitochondria, the inner mitochond... | https://en.wikipedia.org/wiki/Q_cycle |
In physics and engineering , the quality factor or Q factor is a dimensionless parameter that describes how underdamped an oscillator or resonator is. It is defined as the ratio of the initial energy stored in the resonator to the energy lost in one radian of the cycle of oscillation. [ 1 ] Q factor is alternatively d... | https://en.wikipedia.org/wiki/Q_factor |
A Q meter is a piece of equipment used in the testing of radio frequency circuits. It has been largely replaced in professional laboratories by other types of impedance measuring devices, though it is still in use among radio amateurs. It was developed at Boonton Radio Corporation in Boonton, New Jersey in 1934 by Will... | https://en.wikipedia.org/wiki/Q_meter |
In electronics , a Q multiplier is a circuit added to a radio receiver to improve its selectivity and sensitivity. It is a regenerative amplifier adjusted to provide positive feedback within the receiver. This has the effect of narrowing the receiver's bandwidth , as if the Q factor of its tuned circuits had been inc... | https://en.wikipedia.org/wiki/Q_multiplier |
In physics, Q {\displaystyle \mathbf {Q} } tensor is an orientational order parameter that describes uniaxial and biaxial nematic liquid crystals and vanishes in the isotropic liquid phase. [ 1 ] The Q {\displaystyle \mathbf {Q} } tensor is a second-order, traceless, symmetric tensor and is defined by [ 2 ] [ 3 ] [ 4 ]... | https://en.wikipedia.org/wiki/Q_tensor |
In nuclear physics and chemistry , the Q value for a nuclear reaction is the amount of energy absorbed or released during the reaction. The value relates to the enthalpy of a chemical reaction or the energy of radioactive decay products. It can be determined from the masses of reactants and products:
where m r {\displ... | https://en.wikipedia.org/wiki/Q_value_(nuclear_science) |
Within molecular and cell biology , Qa-1b is a MHC class I molecule and is the functional homolog of HLA-E in humans. Qa-1b is characterised by its limited polymorphisms and small peptide repertoire. Qa-1b binds to peptides derived from signal peptides of MHC class Ia molecule and interact with the CD94/ NKG2 receptors... | https://en.wikipedia.org/wiki/Qa-1b |
Qadad ( Arabic : قضاض qaḍāḍ ) or qudad is a waterproof plaster surface, made of a lime plaster treated with slaked lime and oils and fats. The technique is over a thousand years old, [ 1 ] [ 2 ] with the remains of this early plaster still seen on the standing sluices of the ancient Marib Dam . [ 3 ]
Volcanic ash , pu... | https://en.wikipedia.org/wiki/Qadad |
Qbox is an open-source software package for atomic-scale simulations of molecules , liquids and solids . It implements first principles (or ab initio ) molecular dynamics , a simulation method in which inter-atomic forces are derived from quantum mechanics . Qbox is released under a GNU General Public License (GPL) wit... | https://en.wikipedia.org/wiki/Qbox |
Qianfan ( Chinese : 千帆星座 ; pinyin : Qiānfān xīngzuò ; lit. 'Thousand Sails Constellation'), [ 1 ] officially known as the Spacesail Constellation [ 2 ] and also referred to as G60 Starlink , [ 3 ] is a planned Chinese low-Earth orbit satellite internet megaconstellation to create a system of worldwide internet coverage... | https://en.wikipedia.org/wiki/Qianfan |
Twice every year, the Sun culminates at the zenith of the Kaaba in Mecca , the holiest site in Islam , at local solar noon , allowing the qibla (the direction towards the Kaaba ) to be ascertained in other parts of the world by observing the shadows cast by vertical objects. This phenomenon occurs at 12:18 Saudi Arabia... | https://en.wikipedia.org/wiki/Qibla_observation_by_shadows |
In the Baháʼí Faith , the Qiblih ( Arabic : قبلة , "direction") is the location to which Baháʼís face when saying their daily obligatory prayers . The Qiblih is fixed at the Shrine of Baháʼu'lláh , near Acre , in present-day Israel ; approximately at 32°56′37″N 35°5′31″E / 32.94361°N 35.09194°E / 32.94361; 35.0... | https://en.wikipedia.org/wiki/Qiblih |
Qilin Li is a Chinese environmental engineer who is a professor of Civil and Environmental Engineering at Rice University . She develops new technologies to analyze and treat contaminated water. Li is a Fellow of the International Water Association .
Li is from China . [ 1 ] She earned her undergraduate degree at Tsin... | https://en.wikipedia.org/wiki/Qilin_Li |
Qiu Dahong ( Chinese : 邱大洪 ; pinyin : Qiū Dàhóng ; 6 April 1930 – 11 January 2025) was a Chinese coastal and offshore engineer . He served as chief engineer of the Dalian Fishing Port, the New Dalian Port , the Qinhuangdao Petroleum Port, and many other projects. He was a professor of the Dalian University of Technolog... | https://en.wikipedia.org/wiki/Qiu_Dahong |
The Qiu Shi Prizes ( simplified Chinese : 求是奖 ; traditional Chinese : 求是獎 ) are awarded on an annual basis in recognition of advances in science and technology. The Qiu Shi Science and Technology Foundation was established by Cha Chi Ming ( 查濟民 ) (1914–2007) in 1994 in Hong Kong, with the intention of promoting science... | https://en.wikipedia.org/wiki/Qiu_Shi_Science_and_Technology_Prize |
The QosCosGrid is a quasi-opportunistic supercomputing system using grid computing . [ 1 ] [ 2 ]
QosCosGrid acts as middleware resource management facilities which provide end-users with supercomputer-like performance by connecting many computing clusters together. By using QosCosGrid large-scale computing models in e... | https://en.wikipedia.org/wiki/Qoscos_Grid |
QuEChERS is a solid phase extraction method for detection of biocide residues in food. The name is a portmanteau word formed from " quick, easy, cheap, effective, rugged, and safe ". [ 1 ]
The sample ( fruits , vegetables , tobacco , etc.) is homogenized and centrifuged with a reagent and agitated for 1 minute. The re... | https://en.wikipedia.org/wiki/QuEChERS |
QuTiP , short for the Quantum Toolbox in Python , is an open-source computational physics software library for simulating quantum systems , particularly open quantum systems . [ 1 ] [ 2 ] QuTiP allows simulation of Hamiltonians with arbitrary time-dependence, allowing simulation of situations of interest in quantum opt... | https://en.wikipedia.org/wiki/QuTiP |
Qu Geping is a Chinese environmental scientist. He was Director of the Chinese State Environmental Protection Agency from 1987 to June 1993. [ 1 ] [ 2 ]
In 1999, he was the winner of the Blue Planet Prize along with Paul R. Ehrlich .
In 2001, he was awarded the Duke of Edinburgh Conservation Medal , the highest award... | https://en.wikipedia.org/wiki/Qu_Geping |
A quad chart is a form of technical documentation used to briefly describe an invention or other innovation through writing, illustration and/or photographs. [ 1 ] Such documents are described as "quad" charts because they are divided into four quadrants laid out on a landscape perspective. [ 2 ] [ 3 ] [ 4 ] They are t... | https://en.wikipedia.org/wiki/Quad_chart |
A unit of information is any unit of measure of digital data size. In digital computing , a unit of information is used to describe the capacity of a digital data storage device. In telecommunications , a unit of information is used to describe the throughput of a communication channel . In information theory , a unit ... | https://en.wikipedia.org/wiki/Quadlet |
Divine Proportions: Rational Trigonometry to Universal Geometry is a 2005 book by the mathematician Norman J. Wildberger on a proposed alternative approach to Euclidean geometry and trigonometry , called rational trigonometry . The book advocates replacing the usual basic quantities of trigonometry, Euclidean distance... | https://en.wikipedia.org/wiki/Quadrance |
The Quadrans Vetus is a medieval astronomical instrument.
Known as the quadrans vetus ["old quadrant"], the three surviving medieval examples are in the Museo Galileo in Florence , [ 1 ] the Museum of the History of Science in Oxford, [ 2 ] and the British Museum in London. [ 3 ]
There are two sights on one of the st... | https://en.wikipedia.org/wiki/Quadrans_Vetus |
A quadrant is an instrument used to measure angles up to 90° . Different versions of this instrument could be used to calculate various readings, such as longitude , latitude , and time of day . It was first proposed by Ptolemy as a better kind of astrolabe . [ 1 ] Several different variations of the instrument were la... | https://en.wikipedia.org/wiki/Quadrant_(instrument) |
A quadrat is a frame used in ecology , geography , and biology to isolate a standard unit of area for study of the distribution of an item over a large area. Quadrats typically occupy an area of 0.25 m 2 and are traditionally square, but modern quadrats can be rectangular, circular, or irregular. [ 1 ] [ 2 ] A quadrat ... | https://en.wikipedia.org/wiki/Quadrat |
In mathematics, a quadratic-linear algebra is an algebra over a field with a presentation such that all relations are sums of monomials of degrees 1 or 2 in the generators. They were introduced by Polishchuk and Positselski ( 2005 , p.101). An example is the universal enveloping algebra of a Lie algebra , with generato... | https://en.wikipedia.org/wiki/Quadratic-linear_algebra |
A quadratic Lie algebra is a Lie algebra together with a compatible symmetric bilinear form . Compatibility means that it is invariant under the adjoint representation . Examples of such are semisimple Lie algebras , such as su( n ) and sl( n , R ) .
A quadratic Lie algebra is a Lie algebra ( g ,[.,.]) together with... | https://en.wikipedia.org/wiki/Quadratic_Lie_algebra |
In mathematics , a quadratic algebra is a filtered algebra generated by degree one elements, with defining relations of degree 2. It was pointed out by Yuri Manin that such algebras play an important role in the theory of quantum groups . The most important class of graded quadratic algebras is Koszul algebras .
A gra... | https://en.wikipedia.org/wiki/Quadratic_algebra |
In mathematics , a quadratic equation (from Latin quadratus ' square ' ) is an equation that can be rearranged in standard form as [ 1 ] a x 2 + b x + c = 0 , {\displaystyle ax^{2}+bx+c=0\,,} where the variable x represents an unknown number, and a , b , and c represent known numbers, where a ≠ 0 . (If a = 0 and b ≠ 0 ... | https://en.wikipedia.org/wiki/Quadratic_equation |
In mathematics , a quadratic form is a polynomial with terms all of degree two (" form " is another name for a homogeneous polynomial ). For example, 4 x 2 + 2 x y − 3 y 2 {\displaystyle 4x^{2}+2xy-3y^{2}}
is a quadratic form in the variables x and y . The coefficients usually belong to a fixed field K , such as the r... | https://en.wikipedia.org/wiki/Quadratic_form |
In elementary algebra , the quadratic formula is a closed-form expression describing the solutions of a quadratic equation . Other ways of solving quadratic equations, such as completing the square , yield the same solutions.
Given a general quadratic equation of the form a x 2 + b x + c = 0 {\displaystyle \textstyl... | https://en.wikipedia.org/wiki/Quadratic_formula |
In mathematics , a quadratic integral is an integral of the form ∫ d x a + b x + c x 2 . {\displaystyle \int {\frac {dx}{a+bx+cx^{2}}}.}
It can be evaluated by completing the square in the denominator .
∫ d x a + b x + c x 2 = 1 c ∫ d x ( x + b 2 c ) 2 + ( a c − b 2 4 c 2 ) . {\displaystyle \int {\frac {dx}{a+bx+cx^{... | https://en.wikipedia.org/wiki/Quadratic_integral |
In mathematics , a quadratic irrational number (also known as a quadratic irrational or quadratic surd ) is an irrational number that is the solution to some quadratic equation with rational coefficients which is irreducible over the rational numbers . [ 1 ] Since fractions in the coefficients of a quadratic equation c... | https://en.wikipedia.org/wiki/Quadratic_irrational_number |
In mathematics, a quadratic set is a set of points in a projective space that bears the same essential incidence properties as a quadric ( conic section in a projective plane, sphere or cone or hyperboloid in a projective space).
Let P = ( P , G , ∈ ) {\displaystyle {\mathfrak {P}}=({\mathcal {P}},{\mathcal {G}},\in )... | https://en.wikipedia.org/wiki/Quadratic_set |
In mathematics , quadrature is a historic term for the computation of areas and is thus used for computation of integrals .
The word is derived from the Latin quadratus meaning "square". The reason is that, for Ancient Greek mathematicians , the computation of an area consisted of constructing a square of the same are... | https://en.wikipedia.org/wiki/Quadrature_(geometry) |
Quadray coordinates , also known as caltrop , tetray or Chakovian coordinates (named for David Chako [ 1 ] ), were developed by Darrel Jarmusch (in 1981 [ 2 ] ) and others, as another take on simplicial coordinates, a coordinate system using a simplex or tetrahedron as its basis polyhedron. [ 3 ]
The four basis (but n... | https://en.wikipedia.org/wiki/Quadray_coordinates |
Divine Proportions: Rational Trigonometry to Universal Geometry is a 2005 book by the mathematician Norman J. Wildberger on a proposed alternative approach to Euclidean geometry and trigonometry , called rational trigonometry . The book advocates replacing the usual basic quantities of trigonometry, Euclidean distance... | https://en.wikipedia.org/wiki/Quadrea |
A quadruple bond is a type of chemical bond between two atoms involving eight electrons . This bond is an extension of the more familiar types of covalent bonds : double bonds and triple bonds . [ 1 ] Stable quadruple bonds are most common among the transition metals in the middle of the d-block , such as rhenium , tun... | https://en.wikipedia.org/wiki/Quadruple_bond |
In general relativity , the quadrupole formula describes the gravitational waves that are emitted from a system of masses in terms of the (mass) quadrupole moment . The formula reads
where h ¯ i j {\displaystyle {\bar {h}}_{ij}} is the spatial part of the trace reversed perturbation of the metric, i.e. the gravitation... | https://en.wikipedia.org/wiki/Quadrupole_formula |
In experimental physics , a quadrupole ion trap or paul trap is a type of ion trap that uses dynamic electric fields to trap charged particles . They are also called radio frequency (RF) traps or Paul traps in honor of Wolfgang Paul , who invented the device [ 1 ] [ 2 ] and shared the Nobel Prize in Physics in 1989 for... | https://en.wikipedia.org/wiki/Quadrupole_ion_trap |
QualNet is a commercial network simulation tool owned by Keysight Technologies (formerly Scalable Network Technologies). [ 1 ]
QualNet uses parallel discrete event simulation technology to model various layers of the network stack including the physical layer of wireless radios. QualNet simulations may be customized ... | https://en.wikipedia.org/wiki/QualNet |
The Qualcomm Emergency Download mode , commonly known as Qualcomm EDL mode and officially known as Qualcomm HS-USB QD-Loader 9008 [ 1 ] is a feature implemented in the boot ROM of a system on a chip by Qualcomm which can be used to recover bricked smartphones . [ 2 ] [ 3 ] On Google's Pixel 3 , the feature was accident... | https://en.wikipedia.org/wiki/Qualcomm_EDL_mode |
The Toq (pronounced “tok” as in "tick-tock") is a smartwatch developed by Qualcomm released as a proof of concept to OEMs and was released in limited quantities in December 2013. The Toq was first unveiled at Qualcomm's annual Uplinq event on September 4, 2013 in San Diego . It syncs with Android 4.0+ smartphones , all... | https://en.wikipedia.org/wiki/Qualcomm_Toq |
The Snapdragon Qualcomm VR820 is a virtual reality reference platform [ 1 ] that was released in Q4 2016, with the first commercial devices based on the platform available shortly thereafter. It is based on the Qualcomm Snapdragon 820 processor, released on November 10, 2015.
Source: [ 2 ]
This software article is a ... | https://en.wikipedia.org/wiki/Qualcomm_VR_820 |
In the European Union, the Qualified Person Responsible For Pharmacovigilance ( QPPV ) is an individual, usually an employee of a pharmaceutical company, who is personally responsible for the safety of the human pharmaceutical products marketed by that company in the EU. This function was established in 2004 by article... | https://en.wikipedia.org/wiki/Qualified_Person_Responsible_For_Pharmacovigilance |
Classical qualitative inorganic analysis is a method of analytical chemistry which seeks to find the elemental composition of inorganic compounds . It is mainly focused on detecting ions in an aqueous solution , therefore materials in other forms may need to be brought to this state before using standard methods. The s... | https://en.wikipedia.org/wiki/Qualitative_inorganic_analysis |
Qualitative properties are properties that are observed and can generally not be measured with a numerical result, unlike quantitative properties , which have numerical characteristics.
Qualitative properties are properties that are observed and can generally not be measured with a numerical result. [ 1 ] They are con... | https://en.wikipedia.org/wiki/Qualitative_property |
Qualitative Reasoning (QR) is an area of research within Artificial Intelligence (AI) that automates reasoning about continuous aspects of the physical world, such as space, time, and quantity, for the purpose of problem solving and planning using qualitative rather than quantitative information. [ 1 ] Precise numerica... | https://en.wikipedia.org/wiki/Qualitative_reasoning |
In mathematics , the qualitative theory of differential equations studies the behavior of differential equations by means other than finding their solutions. It originated from the works of Henri Poincaré and Aleksandr Lyapunov . There are relatively few differential equations that can be solved explicitly, but using t... | https://en.wikipedia.org/wiki/Qualitative_theory_of_differential_equations |
Quality, cost, delivery ( QCD ), sometimes expanded to quality , cost , delivery , morale, safety ( QCDMS ), [ 1 ] is a management approach originally developed by the British automotive industry . [ 2 ] QCD assess different components of the production process and provides feedback in the form of facts and figures tha... | https://en.wikipedia.org/wiki/Quality,_cost,_delivery |
In response theory , the quality of an excited system is related to the number of excitation frequencies to which it can respond. In the case of a homogeneous, isotropic system, the quality is proportional to the FWHM .
This sense of the phrase is the precursor of the usage of the word in music theory . In music theor... | https://en.wikipedia.org/wiki/Quality_(physics) |
The rapid development in the multidisciplinary field of tissue engineering has resulted in a variety of new and innovative medicinal products, often carrying living cells, intended to repair, regenerate or replace damaged human tissue. Tissue engineered medicinal products (TEMPs) vary in terms of the type and origin of... | https://en.wikipedia.org/wiki/Quality_control_in_tissue_engineering |
A quality control system (QCS) refers to a system used to measure and control the quality of moving sheet processes on-line as in the paper produced by a paper machine. Generally, a control system is concerned with measurement and control of one or multiple properties in time in a single dimension. A QCS is designed to... | https://en.wikipedia.org/wiki/Quality_control_system_for_paper,_board_and_tissue_machines |
Quality engineering is the discipline of engineering concerned with the principles and practice of product and service quality assurance and control . [ 1 ] In software development, it is the management, development, operation and maintenance of IT systems and enterprise architectures with high quality standard. [ 2 ] ... | https://en.wikipedia.org/wiki/Quality_engineering |
The quality intellectual property metric (QIP) is an international standard, developed by Virtual Socket Interface Alliance ( VSIA ) [ 1 ] for measuring Intellectual Property (IP) or Silicon intellectual property (SIP) quality and examining the practices used to design, integrate and support the SIP. SIP hardening is r... | https://en.wikipedia.org/wiki/Quality_intellectual_property_metric |
Quality of measurements made in chemistry and other areas is an important issue in today's world as measurements influence quality of life , cross-border trade and commerce . In this respect, EN ISO 17025 is the main standard used by testing and calibration laboratories as to appropriately tackle quality management rel... | https://en.wikipedia.org/wiki/Quality_of_analytical_results |
Quality of experience ( QoE ) is a measure of the delight or annoyance of a customer's experiences with a service (e.g., web browsing, phone call, TV broadcast). [ 1 ] QoE focuses on the entire service experience; it is a holistic concept, similar to the field of user experience , but with its roots in telecommunicatio... | https://en.wikipedia.org/wiki/Quality_of_experience |
Quantal neurotransmitter release is the process by which neurons communicate by releasing neurotransmitters in discrete, measurable units known as quanta . Each quantum represents the contents of a single synaptic vesicle , which fuses with the presynaptic membrane to release neurotransmitters into the synaptic cleft .... | https://en.wikipedia.org/wiki/Quantal_neurotransmitter_release |
Quantasomes are particles found in the thylakoid membrane of chloroplasts in which photosynthesis takes place. They are embedded in a paracrystalline array on the surface of thylakoid discs in chloroplasts. They are composed of lipids and proteins that include various photosynthetic pigments and redox carriers. For thi... | https://en.wikipedia.org/wiki/Quantasome |
Quantemol Ltd is based in University College London initiated by Professor Jonathan Tennyson FRS and Dr. Daniel Brown in 2004. The company initially developed a unique software tool, Quantemol-N , which provides full accessibility to the highly sophisticated UK molecular R-matrix codes, used to model electron polyatomi... | https://en.wikipedia.org/wiki/Quantemol-DB |
An interferon-gamma release assay ( IGRA ) is a diagnostic tool for indicating a latent tuberculosis infection (LTBI). IGRAs are surrogate markers of Mycobacterium tuberculosis infection and indicate a cellular immune response to M. tuberculosis if the latter is present.
IGRAs cannot distinguish between latent infecti... | https://en.wikipedia.org/wiki/Quantiferon |
In mathematics and empirical science , quantification (or quantitation ) is the act of counting and measuring that maps human sense observations and experiences into quantities . Quantification in this sense is fundamental to the scientific method .
Some measure of the undisputed general importance of quantification i... | https://en.wikipedia.org/wiki/Quantification_(science) |
In logic , a quantifier is an operator that specifies how many individuals in the domain of discourse satisfy an open formula . For instance, the universal quantifier ∀ {\displaystyle \forall } in the first-order formula ∀ x P ( x ) {\displaystyle \forall xP(x)} expresses that everything in the domain satisfies the pro... | https://en.wikipedia.org/wiki/Quantifier_(logic) |
Quantifier elimination is a concept of simplification used in mathematical logic , model theory , and theoretical computer science . Informally, a quantified statement " ∃ x {\displaystyle \exists x} such that ..." can be viewed as a question "When is there an x {\displaystyle x} such that ...?", and the statement with... | https://en.wikipedia.org/wiki/Quantifier_elimination |
In mathematical logic , the quantifier rank of a formula is the depth of nesting of its quantifiers . It plays an essential role in model theory .
The quantifier rank is a property of the formula itself (i.e. the expression in a language). Thus two logically equivalent formulae can have different quantifier ranks, wh... | https://en.wikipedia.org/wiki/Quantifier_rank |
In analytical chemistry , quantitative analysis is the determination of the absolute or relative abundance (often expressed as a concentration ) of one, several or all particular substance(s) present in a sample. [ 1 ] It relates to the determination of percentage of constituents in any given sample. [ 2 ]
Once the pr... | https://en.wikipedia.org/wiki/Quantitative_analysis_(chemistry) |
Quantitative biology is an umbrella term encompassing the use of mathematical, statistical or computational techniques to study life and living organisms . The central theme and goal of quantitative biology is the creation of predictive models based on fundamental principles governing living systems . [ 1 ] [ 2 ]
The ... | https://en.wikipedia.org/wiki/Quantitative_biology |
Quantitative comparative linguistics is the use of quantitative analysis as applied to comparative linguistics . Examples include the statistical fields of lexicostatistics and glottochronology , and the borrowing of phylogenetics from biology.
Statistical methods have been used for the purpose of quantitative analysi... | https://en.wikipedia.org/wiki/Quantitative_comparative_linguistics |
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