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A noise print is part of a technique used in noise reduction . A noise print is commonly used in audio mastering to help reduce the effects of unwanted noise from a piece of audio. In this case, the noise print would be a recording of the ambient noise in the room, which is then used in spectral subtraction to set mult... | https://en.wikipedia.org/wiki/Noise_print |
Noise reduction is the process of removing noise from a signal . Noise reduction techniques exist for audio and images. Noise reduction algorithms may distort the signal to some degree. Noise rejection is the ability of a circuit to isolate an undesired signal component from the desired signal component, as with common... | https://en.wikipedia.org/wiki/Noise_reduction |
Noise regulation includes statutes or guidelines relating to sound transmission established by national, state or provincial and municipal levels of government. After the watershed passage of the United States Noise Control Act of 1972 , [ 2 ] other local and state governments passed further regulations.
A noise regul... | https://en.wikipedia.org/wiki/Noise_regulation |
Noise shaping is a technique typically used in digital audio , image , and video processing , usually in combination with dithering , as part of the process of quantization or bit-depth reduction of a signal . Its purpose is to increase the apparent signal-to-noise ratio of the resultant signal. It does this by alterin... | https://en.wikipedia.org/wiki/Noise_shaping |
In electronics, noise temperature is one way of expressing the level of available noise power introduced by a component or source. The power spectral density of the noise is expressed in terms of the temperature (in kelvins ) that would produce that level of Johnson–Nyquist noise , thus:
where:
Thus the noise tempera... | https://en.wikipedia.org/wiki/Noise_temperature |
A noise weighting is a specific amplitude-vs.- frequency characteristic that is designed to allow subjectively valid measurement of noise. It emphasises the parts of the spectrum that are most important.
Usually, noise means audible noise, in audio systems, broadcast systems or telephone circuits. In this case the wei... | https://en.wikipedia.org/wiki/Noise_weighting |
The Nokia Asha platform is a discontinued mobile operating system (OS) and computing platform [ 2 ] designed for low-end borderline smartphones , The Asha platform was active from 2013 and 2014 and replaced Series 40 on Nokia 's low-end touchscreen devices in the Nokia Asha series . [ 3 ] It inherits UI similarities mo... | https://en.wikipedia.org/wiki/Nokia_Asha_platform |
The Nokia Communicator is a brand name for a series of business-optimized mobile phones marketed by Nokia Corporation , all of which appear as normal (if large) phones on the outside, and open in clamshell format to access a QWERTY keyboard and an LCD screen nearly the size of the device footprint.
Nokia Communicators... | https://en.wikipedia.org/wiki/Nokia_Communicator |
Nokia Steel HR is a "hybrid" smartwatch and activity/fitness tracker developed by Nokia and released in December 2017. [ 1 ] [ 2 ] Its design [ 3 ] is mostly based on the Withings Steel HR. The watch is available in 36 mm and 40 mm variants, available in various colours and in silicone , leather and woven straps. [ 4 ]... | https://en.wikipedia.org/wiki/Nokia_Steel_HR |
The Nokia tune is a phrase from a composition for solo guitar, Gran Vals , composed in 1902 by the Spanish classical guitarist and composer Francisco Tárrega . [ 1 ] It has been associated with Finnish corporation Nokia since the 1990s, becoming the first identifiable musical ringtone on a mobile phone; Nokia selected ... | https://en.wikipedia.org/wiki/Nokia_tune |
Nokwanda Pearl (Nox) Makunga is a Professor of Biotechnology at Stellenbosch University .
Makunga grew up in Alice in the Eastern Cape , and attended a private boarding school in Grahamstown . [ 1 ] Her father, Oswald, was a botanist who specialised in the Iridaceae . [ 1 ] He grew up in rural poverty and won a schola... | https://en.wikipedia.org/wiki/Nokwanda_Makunga |
Nomad is a company that sells eSIMs (embedded SIMs), launched in 2020.
Nomad was launched in 2020 and is a business line of LotusFlare, Inc. , a telecommunications software development company founded by former Facebook and Microsoft engineers. [ 1 ]
Nomad is a connectivity marketplace that offers mobile data plans w... | https://en.wikipedia.org/wiki/Nomad_(eSIM_company) |
Nomad Digital is an Internet Protocol (IP) Connectivity provider to the transport sector. It deploys wireless broadband connections for trains, metros , trams and buses, including passenger Wi-Fi services and remote condition monitoring for on-board rail components. Headquartered in Newcastle upon Tyne in England, it o... | https://en.wikipedia.org/wiki/Nomad_Digital |
NOMAD is a relational database and fourth-generation language (4GL), originally developed in the 1970s by time-sharing vendor National CSS . While it is still in use today, its widest use was in the 1970s and 1980s. NOMAD supports both the relational and hierarchical database models . [ 1 ]
NOMAD provides both interac... | https://en.wikipedia.org/wiki/Nomad_software |
Nomadix, Inc. is an American developer of network gateway equipment used by hotels and other businesses to deliver Internet access to end users. Based in Woodland Hills, California , the company has been part of Assa Abloy since its acquisition in 2024.
Nomadix sells through distributors to hospitality businesses with... | https://en.wikipedia.org/wiki/Nomadix |
A Nomarski prism is a modification of the Wollaston prism that is used in differential interference contrast microscopy . It is named after its inventor, Polish and naturalized-French physicist Georges Nomarski . Like the Wollaston prism, the Nomarski prism consists of two birefringent crystal wedges (e.g. quartz or ca... | https://en.wikipedia.org/wiki/Nomarski_prism |
A conserved name or nomen conservandum (plural nomina conservanda , abbreviated as nom. cons. ) is a scientific name that has specific nomenclatural protection. That is, the name is retained, even though it violates one or more rules which would otherwise prevent it from being legitimate. Nomen conservandum is a Latin ... | https://en.wikipedia.org/wiki/Nomen_conservandum |
In binomial nomenclature , a nomen dubium ( Latin for "doubtful name", plural nomina dubia ) is a scientific name that is of unknown or doubtful application.
In case of a nomen dubium, it may be impossible to determine whether a specimen belongs to that group or not. This may happen if the original type series (i. e. ... | https://en.wikipedia.org/wiki/Nomen_dubium |
Nomen illegitimum ( Latin for illegitimate name ) is a technical term used mainly in botany . It is usually abbreviated as nom. illeg. Although the International Code of Nomenclature for algae, fungi, and plants uses Latin terms as qualifiers for taxon names (e.g. nomen conservandum for " conserved name ", and nomen s... | https://en.wikipedia.org/wiki/Nomen_illegitimum |
In biological nomenclature, a nomen novum ( Latin for "new name"), replacement name (or new replacement name, new substitute name, substitute name [ 1 ] ) is a scientific name that is created specifically to replace another scientific name, but only when this other name cannot be used for technical, nomenclatural reaso... | https://en.wikipedia.org/wiki/Nomen_novum |
In taxonomy , a nomen nudum ('naked name'; plural nomina nuda ) is a designation [ 2 ] which looks exactly like a scientific name of an organism, and may have originally been intended to be one, but it has not been published with an adequate description. This makes it a "bare" or "naked" name, which cannot be accepted ... | https://en.wikipedia.org/wiki/Nomen_nudum |
In zoological nomenclature, a nomen oblitum (plural: nomina oblita ; Latin for "forgotten name") is a disused scientific name which has been declared to be obsolete (figuratively "forgotten") in favor of another "protected" name.
In its present meaning, the nomen oblitum came into being with the fourth edition (1999) ... | https://en.wikipedia.org/wiki/Nomen_oblitum |
Nomenclature codes or codes of nomenclature are the various rulebooks that govern the naming of living organisms. Standardizing the scientific names of biological organisms allows researchers to discuss findings (including the discovery of new species).
As the study of biology became increasingly specialized, specific... | https://en.wikipedia.org/wiki/Nomenclature_codes |
Nomenclature of Organic Chemistry , commonly referred to by chemists as the Blue Book , is a collection of recommendations on organic chemical nomenclature published at irregular intervals by the International Union of Pure and Applied Chemistry (IUPAC). A full edition was published in 1979, [ 1 ] an abridged and updat... | https://en.wikipedia.org/wiki/Nomenclature_of_Organic_Chemistry |
Nomex is a trademarked term for an inherently flame-resistant fabric with meta - aramid chemistry widely used for industrial applications and fire protection equipment. It was developed in the early 1960s by DuPont and first marketed in 1967. [ 1 ]
The fabric is often combined with Kevlar to increase its resistance fo... | https://en.wikipedia.org/wiki/Nomex |
Nominal Pipe Size ( NPS ) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [ 1 ] "Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties o... | https://en.wikipedia.org/wiki/Nominal_Pipe_Size |
Nominal power is a power capacity in engineering. [ 1 ] [ 2 ] [ 3 ]
Nominal power is a measurement of a mediumwave radio station 's output used in the United States .
Nominal power is the nameplate capacity of photovoltaic (PV) devices, such as solar cells , panels and systems , and is determined by measuring the el... | https://en.wikipedia.org/wiki/Nominal_power |
Nomophobia [ 1 ] (short for "no mobile phobia ") is a word for the fear of, or anxiety caused by, not having a working mobile phone . [ 2 ] [ 3 ] It has been considered a symptom or syndrome of problematic digital media use in mental health , the definitions of which are not standardized for technical and genetical rea... | https://en.wikipedia.org/wiki/Nomophobia |
Nomurabacteria is a candidate phylum of bacteria belonging to the CPR group . They are ultra-small bacteria that have been found in a wide variety of environments, mainly in sediments under anaerobic conditions. [ 1 ] [ 2 ]
Bacteria of this phylum share several of their characteristics with other ultra-small bacteria,... | https://en.wikipedia.org/wiki/Nomurabacteria |
In mathematics , non-Archimedean geometry [ 1 ] is any of a number of forms of geometry in which the axiom of Archimedes is negated. An example of such a geometry is the Dehn plane . Non-Archimedean geometries may, as the example indicates, have properties significantly different from Euclidean geometry .
There are tw... | https://en.wikipedia.org/wiki/Non-Archimedean_geometry |
Non-B DB is a database integrating annotations and analysis of non-B DNA-forming sequence motifs . [ 1 ] The database provides alternative DNA structure predictions including Z-DNA motifs , quadruplex-forming motifs, inverted repeats, mirror repeats and direct repeats and their associated subsets of cruciforms, triplex... | https://en.wikipedia.org/wiki/Non-B_database |
Non-English-based programming languages are programming languages that do not use keywords taken from or inspired by English vocabulary.
The use of the English language in the inspiration for the choice of elements, in particular for keywords in computer programming languages and code libraries, represents a significa... | https://en.wikipedia.org/wiki/Non-English-based_programming_languages |
In mathematics , a non-Euclidean crystallographic group , NEC group or N.E.C. group is a discrete group of isometries of the hyperbolic plane. These symmetry groups correspond to the wallpaper groups in euclidean geometry . A NEC group which contains only orientation-preserving elements is called a Fuchsian group , and... | https://en.wikipedia.org/wiki/Non-Euclidean_crystallographic_group |
In the field of surface growth , there are growth processes that result in the surface of an object changing shape over time. As the object grows, its surface may change from flat to curved, or change curvature . Two points on the surface may also change in distance as a result of deformations of the object or accretio... | https://en.wikipedia.org/wiki/Non-Euclidean_surface_growth |
In geometry and topology , it is a usual axiom of a manifold to be a Hausdorff space . In general topology , this axiom is relaxed, and one studies non-Hausdorff manifolds : spaces locally homeomorphic to Euclidean space , but not necessarily Hausdorff.
The most familiar non-Hausdorff manifold is the line with two ori... | https://en.wikipedia.org/wiki/Non-Hausdorff_manifold |
A non-Kekulé molecule is a conjugated hydrocarbon that cannot be assigned a classical Kekulé structure [ definition needed ] .
Since non-Kekulé molecules have two or more formal charges or radical centers, their spin-spin interactions can cause electrical conductivity or ferromagnetism ( molecule-based magnets ), and ... | https://en.wikipedia.org/wiki/Non-Kekulé_molecule |
In physics and chemistry , a non-Newtonian fluid is a fluid that does not follow Newton's law of viscosity , that is, it has variable viscosity dependent on stress . In particular, the viscosity of non-Newtonian fluids can change when subjected to force. Ketchup , for example, becomes runnier when shaken and is thus a ... | https://en.wikipedia.org/wiki/Non-Newtonian_fluid |
Non-Nuclear Futures: The Case for an Ethical Energy Strategy is a 1975 book by Amory B. Lovins and John H. Price. [ 1 ] [ 2 ] The main theme of the book is that the most important parts of the nuclear power debate are not technical disputes but relate to personal values, and are the legitimate province of every citizen... | https://en.wikipedia.org/wiki/Non-Nuclear_Futures |
The Non-Proliferation Trust ( NPT ) is a U.S. nonprofit organization that, at the beginning of the 21st century, advocated storing 10,000 tons of U.S. nuclear waste in Russia for a fee of $15 billion paid to the Russian government [ 1 ] and $250 million paid to a fund for Russian orphans . The group was headed by Admir... | https://en.wikipedia.org/wiki/Non-Proliferation_Trust |
Non-Quasi Static model ( NQS ) is a transistor model used in analogue /mixed signal IC design . It becomes necessary to use an NQS model when the operational frequency of the device is in the range of its transit time. Normally, in a quasi-static (QS) model, voltage changes in the MOS transistor channel are assumed t... | https://en.wikipedia.org/wiki/Non-Quasi_Static_model |
Non-access stratum (NAS) is a functional layer in the NR, LTE , UMTS and GSM wireless telecom protocol stacks between the core network and user equipment . [ 1 ] This layer is used to manage the establishment of communication sessions and for maintaining continuous communications with the user equipment as it moves. T... | https://en.wikipedia.org/wiki/Non-access_stratum |
Non-allelic homologous recombination ( NAHR ) is a form of homologous recombination that occurs between two lengths of DNA that have high sequence similarity, but are not alleles . [ 1 ] [ 2 ] [ 3 ]
It usually occurs between sequences of DNA that have been previously duplicated through evolution, and therefore have lo... | https://en.wikipedia.org/wiki/Non-allelic_homologous_recombination |
In mathematics , smooth functions (also called infinitely differentiable functions) and analytic functions are two very important types of functions . One can easily prove that any analytic function of a real argument is smooth. The converse is not true, as demonstrated with the counterexample below.
One of the most i... | https://en.wikipedia.org/wiki/Non-analytic_smooth_function |
Non-aqueous phase liquids , or NAPLs , are organic liquid contaminants characterized by their relative immiscibility with water. Common examples of NAPLs are petroleum products , coal tars , chlorinated solvents , and pesticides . Strategies employed for their removal from the subsurface environment have expanded since... | https://en.wikipedia.org/wiki/Non-aqueous_phase_liquid |
Non-autonomous mechanics describe non- relativistic mechanical systems subject to time-dependent transformations. In particular, this is the case of mechanical systems whose Lagrangians and Hamiltonians depend on the time. The configuration space of non-autonomous mechanics is a fiber bundle Q → R {\displaystyle Q\to \... | https://en.wikipedia.org/wiki/Non-autonomous_mechanics |
In mathematics, an autonomous system is a dynamic equation on a smooth manifold . A non-autonomous system is a dynamic equation on a smooth fiber bundle Q → R {\displaystyle Q\to \mathbb {R} } over R {\displaystyle \mathbb {R} } . For instance, this is the case of non-autonomous mechanics .
An r -order differential eq... | https://en.wikipedia.org/wiki/Non-autonomous_system_(mathematics) |
A non-bonding electron is an electron not involved in chemical bonding. This can refer to: | https://en.wikipedia.org/wiki/Non-bonding_electron |
A non-bonding orbital , also known as non-bonding molecular orbital (NBMO), is a molecular orbital whose occupation by electrons neither increases nor decreases the bond order between the involved atoms . Non-bonding orbitals are often designated by the letter n in molecular orbital diagrams and electron transition not... | https://en.wikipedia.org/wiki/Non-bonding_orbital |
Non-cellular life , also known as acellular life , is life that exists without a cellular structure for at least part of its life cycle . [ 1 ] Historically, most definitions of life postulated that an organism must be composed of one or more cells, [ 2 ] but, for some, this is no longer considered necessary, and moder... | https://en.wikipedia.org/wiki/Non-cellular_life |
Non-classical logics (and sometimes alternative logics or non-Aristotelian logics ) are formal systems that differ in a significant way from standard logical systems such as propositional and predicate logic. There are several ways in which this is commonly the case, including by way of extensions, deviations, and vari... | https://en.wikipedia.org/wiki/Non-classical_logic |
Non-coding DNA ( ncDNA ) sequences are components of an organism's DNA that do not encode protein sequences. Some non-coding DNA is transcribed into functional non-coding RNA molecules (e.g. transfer RNA , microRNA , piRNA , ribosomal RNA , and regulatory RNAs ). Other functional regions of the non-coding DNA fraction ... | https://en.wikipedia.org/wiki/Non-coding_DNA |
A non-coding RNA ( ncRNA ) is a functional RNA molecule that is not translated into a protein . The DNA sequence from which a functional non-coding RNA is transcribed is often called an RNA gene . Abundant and functionally important types of non-coding RNAs include transfer RNAs (tRNAs) and ribosomal RNAs (rRNAs), as w... | https://en.wikipedia.org/wiki/Non-coding_RNA |
Non-competitive inhibition is a type of enzyme inhibition where the inhibitor reduces the activity of the enzyme and binds equally well to the enzyme regardless of whether it has already bound the substrate. [ 1 ] This is unlike competitive inhibition , where binding affinity for the substrate in the enzyme is decrease... | https://en.wikipedia.org/wiki/Non-competitive_inhibition |
Non-contact atomic force microscopy ( nc-AFM ), also known as dynamic force microscopy ( DFM ), is a mode of atomic force microscopy , which itself is a type of scanning probe microscopy . In nc-AFM a sharp probe is moved close (order of angstroms ) to the surface under study, the probe is then raster scanned across th... | https://en.wikipedia.org/wiki/Non-contact_atomic_force_microscopy |
A non-contact force is a force which acts on an object without coming physically in contact with it. [ 1 ] The most familiar non-contact force is gravity , which confers weight . [ 1 ] In contrast, a contact force is a force which acts on an object coming physically in contact with it. [ 1 ]
All four known fundamental... | https://en.wikipedia.org/wiki/Non-contact_force |
Non contact wafer testing is an alternative to mechanical probing of ICs during the wafer testing step in semiconductor device fabrication .
Probing ICs while they are still on the wafer normally requires that contact be made between the automatic test equipment (ATE) and IC. This contact is usually made with some for... | https://en.wikipedia.org/wiki/Non-contact_wafer_testing |
Anions that interact weakly with cations are termed non-coordinating anions , although a more accurate term is weakly coordinating anion . [ 1 ] Non-coordinating anions are useful in studying the reactivity of electrophilic cations. They are commonly found as counterions for cationic metal complexes with an unsaturate... | https://en.wikipedia.org/wiki/Non-coordinating_anion |
In chemistry , a non-covalent interaction differs from a covalent bond in that it does not involve the sharing of electrons , [ 1 ] but rather involves more dispersed variations of electromagnetic interactions between molecules or within a molecule. The chemical energy released in the formation of non-covalent interact... | https://en.wikipedia.org/wiki/Non-covalent_interaction |
The Non-Covalent Interactions index , commonly referred to as simply Non-Covalent Interactions (NCI) is a visualization index based in the Electron density (ρ) and the reduced density gradient (s). It is based on the empirical observation that Non-covalent interactions can be associated with the regions of small reduce... | https://en.wikipedia.org/wiki/Non-covalent_interactions_index |
A non-credible threat is a term used in game theory and economics to describe a threat in a sequential game that a rational player would not actually carry out, because it would not be in his best interest to do so.
A threat, and its counterpart – a commitment, are both defined by American economist and Nobel prize wi... | https://en.wikipedia.org/wiki/Non-credible_threat |
A non-directional beacon ( NDB ) or non-directional radio beacon is a radio beacon which does not include inherent directional information. Radio beacons are radio transmitters at a known location, used as an aviation or marine navigational aid . NDB are in contrast to directional radio beacons and other navigational a... | https://en.wikipedia.org/wiki/Non-directional_beacon |
A non-drying oil is an oil which does not harden and remains liquid when it is exposed to air. This is as opposed to a drying oil , which hardens (through polymerization) completely, or a semi-drying oil , which partially hardens. Oils with an iodine number of less than 115 are considered non-drying.
Non-drying oil i... | https://en.wikipedia.org/wiki/Non-drying_oil |
In physics , statistical mechanics is a mathematical framework that applies statistical methods and probability theory to large assemblies of microscopic entities. Sometimes called statistical physics or statistical thermodynamics , its applications include many problems in a wide variety of fields such as biology , [ ... | https://en.wikipedia.org/wiki/Non-equilibrium_statistical_mechanics |
Non-exercise activity thermogenesis ( NEAT ), also known as non-exercise physical activity (NEPA), [ 1 ] is energy expenditure during activities that are not part of a structured exercise program. NEAT includes physical activity at the workplace, hobbies, standing instead of sitting, walking around, climbing stairs, do... | https://en.wikipedia.org/wiki/Non-exercise_activity_thermogenesis |
Non-explosive demolition agents are chemicals that are an alternative to explosives and gas pressure blasting products in demolition, mining, and quarrying . [ 1 ] To use non-explosive demolition agents in demolition or quarrying , holes are drilled in the base rock as they would be for use with conventional explosives... | https://en.wikipedia.org/wiki/Non-explosive_demolition_agents |
In experimental physics , researchers have proposed non-extensive self-consistent thermodynamic theory to describe phenomena observed in the Large Hadron Collider (LHC) . This theory investigates a fireball for high-energy particle collisions, while using Tsallis non-extensive thermodynamics . [ 1 ] Fireballs lead to ... | https://en.wikipedia.org/wiki/Non-extensive_self-consistent_thermodynamical_theory |
Non-ferrous extractive metallurgy is one of the two branches of extractive metallurgy which pertains to the processes of reducing valuable, non-iron metals from ores or raw material . [ 1 ] [ 2 ] [ 3 ] Metals like zinc , copper , lead , aluminium as well as rare and noble metals are of particular interest in this field... | https://en.wikipedia.org/wiki/Non-ferrous_extractive_metallurgy |
In metallurgy , non-ferrous metals are metals or alloys that do not contain iron ( allotropes of iron , ferrite , and so on) in appreciable amounts.
Generally more costly than ferrous metals, non-ferrous metals are used because of desirable properties such as low weight (e.g. aluminium ), higher conductivity (e.g. cop... | https://en.wikipedia.org/wiki/Non-ferrous_metal |
In systems engineering and requirements engineering , a non-functional requirement ( NFR ) is a requirement that specifies criteria that can be used to judge the operation of a system, rather than specific behaviours. They are contrasted with functional requirements that define specific behavior or functions. The plan ... | https://en.wikipedia.org/wiki/Non-functional_requirement |
NFR ( Non-Functional Requirements ) need a framework for compaction. The analysis begins with softgoals that represent NFR which stakeholders agree upon. Softgoals are goals that are hard to express, but tend to be global qualities of a software system. These could be usability, performance, security and flexibility in... | https://en.wikipedia.org/wiki/Non-functional_requirements_framework |
A non-inertial reference frame (also known as an accelerated reference frame [ 1 ] ) is a frame of reference that undergoes acceleration with respect to an inertial frame . [ 2 ] An accelerometer at rest in a non-inertial frame will, in general, detect a non-zero acceleration. While the laws of motion are the same in a... | https://en.wikipedia.org/wiki/Non-inertial_reference_frame |
In chemistry , a (redox) non-innocent ligand is a ligand in a metal complex where the oxidation state is not
clear. Typically, complexes containing non-innocent ligands are redox active at mild potentials . The concept assumes that redox reactions in metal complexes are either metal or ligand localized, which is a si... | https://en.wikipedia.org/wiki/Non-innocent_ligand |
A non-integer representation uses non- integer numbers as the radix , or base, of a positional numeral system . For a non-integer radix β > 1, the value of
is
The numbers d i are non-negative integers less than β . This is also known as a β -expansion , a notion introduced by Rényi (1957) and first studied in detail... | https://en.wikipedia.org/wiki/Non-integer_base_of_numeration |
Non-invasive micro-test technology (NMT) is a scientific research technology used for measuring physiological events of intact biological samples. NMT is used for research in many biological areas such as gene function , plant physiology , biomedical research , and environmental science . [ 1 ] [ 2 ]
Most living thing... | https://en.wikipedia.org/wiki/Non-invasive_micro-test_technology |
In physics, a non-invertible symmetry is a symmetry of a quantum field theory that is not described by a group , and which in particular does not have an inverse .
Non-invertible symmetries were first studied in 2-dimensional conformal field theory , where fusion categories govern the fusion rules , rather than a grou... | https://en.wikipedia.org/wiki/Non-invertible_symmetry |
In enantioselective synthesis , a non-linear effect refers to a process in which the enantiopurity of the catalyst (or the chiral auxiliary ) does not correlate linearly with the enantiopurity of the product produced. [ 1 ] [ 2 ] This deviation from linearity is described as the non-linear effect , NLE . [ 3 ] The line... | https://en.wikipedia.org/wiki/Non-linear_effects |
Non-linear inverse Compton scattering ( NICS ), also known as non-linear Compton scattering and multiphoton Compton scattering , is the scattering of multiple low-energy photons , given by an intense electromagnetic field , in a high-energy photon ( X-ray or gamma ray ) during the interaction with a charged particle , ... | https://en.wikipedia.org/wiki/Non-linear_inverse_Compton_scattering |
Non-metallic inclusions are chemical compounds and nonmetals that are present in steel and other alloys . They are the product of chemical reactions, physical effects, and contamination that occurs during the melting and pouring process. These inclusions are categorized by origin as either endogenous or exogenous. [ 1 ... | https://en.wikipedia.org/wiki/Non-metallic_inclusions |
The non-mevalonate pathway —also appearing as the mevalonate-independent pathway and the 2- C -methyl- D -erythritol 4-phosphate/1-deoxy- D -xylulose 5-phosphate ( MEP/DOXP ) pathway —is an alternative metabolic pathway for the biosynthesis of the isoprenoid precursors isopentenyl pyrophosphate (IPP) and dimethylallyl ... | https://en.wikipedia.org/wiki/Non-mevalonate_pathway |
Non-motile bacteria are bacteria species that lack the ability and structures that would allow them to propel themselves, under their own power, through their environment. When non-motile bacteria are cultured in a stab tube, they only grow along the stab line . If the bacteria are mobile, the line will appear diffuse ... | https://en.wikipedia.org/wiki/Non-motile_bacteria |
The English language has a number of words that denote specific or approximate quantities that are themselves not numbers . [ 1 ] Along with numerals, and special-purpose words like some, any, much, more, every, and all, they are quantifiers . Quantifiers are a kind of determiner and occur in many constructions with ot... | https://en.wikipedia.org/wiki/Non-numerical_words_for_quantities |
In wormhole theory, a non-orientable wormhole is a wormhole connection that appears to reverse the chirality of anything passed through it. It is related to the "twisted" connections normally used to construct a Möbius strip or Klein bottle .
In topology , this sort of connection is referred to as an Alice handle [ ci... | https://en.wikipedia.org/wiki/Non-orientable_wormhole |
Non-photochemical quenching ( NPQ ) is a mechanism employed by plants and algae to protect themselves from the adverse effects of high light intensity. It involves the quenching of singlet excited state chlorophylls (Chl) via enhanced internal conversion to the ground state (non-radiative decay), thus harmlessly dissi... | https://en.wikipedia.org/wiki/Non-photochemical_quenching |
Non-physical true random number generator ( NPTRNG ), [ 1 ] also known as non-physical nondeterministic random bit generator is a true random number generator that does not have access to a dedicated hardware entropy source . [ 2 ] NPTRNG uses a non-physical noise source that obtains entropy from system data, like outp... | https://en.wikipedia.org/wiki/Non-physical_true_random_number_generator |
The non-random two-liquid model [ 1 ] (abbreviated NRTL model ) is an activity coefficient model introduced by Renon
and Prausnitz in 1968 that correlates the activity coefficients γ i {\displaystyle \gamma _{i}} of a compound with its mole fractions x i {\displaystyle x_{i}} in the liquid phase concerned. It is freque... | https://en.wikipedia.org/wiki/Non-random_two-liquid_model |
Non-recurring engineering ( NRE ) cost refers to the one-time cost to research , design , develop and test a new product or product enhancement. [ 1 ] When budgeting for a new product, NRE must be considered to analyze if a new product will be profitable . Even though a company will pay for NRE on a project only once, ... | https://en.wikipedia.org/wiki/Non-recurring_engineering |
In physics, a non-relativistic spacetime is any mathematical model that fuses n –dimensional space and m –dimensional time into a single continuum other than the (3+1) model used in relativity theory .
In the sense used in this article, a spacetime is deemed "non-relativistic" if (a) it deviates from (3+1) dimensional... | https://en.wikipedia.org/wiki/Non-relativistic_spacetime |
A non-renewable resource (also called a finite resource ) is a natural resource that cannot be readily replaced by natural means at a pace quick enough to keep up with consumption. [ 1 ] An example is carbon-based fossil fuels. The original organic matter, with the aid of heat and pressure, becomes a fuel such as oil o... | https://en.wikipedia.org/wiki/Non-renewable_resource |
Non-simultaneity or nonsynchronism (German: Ungleichzeitigkeit , sometimes also translated as non-synchronicity ) is a concept in the writings of Ernst Bloch which denotes the time lag, or uneven temporal development , produced in the social sphere by the processes of capitalist modernization and/or the incomplete natu... | https://en.wikipedia.org/wiki/Non-simultaneity |
Non-smooth mechanics is a modeling approach in mechanics which does not require the time evolutions of the positions and of the velocities to be smooth functions . [ 1 ] Due to possible impacts, the velocities of the mechanical system are allowed to undergo jumps at certain time instants in order to fulfill the kinemat... | https://en.wikipedia.org/wiki/Non-smooth_mechanics |
The non-squeezing theorem , also called Gromov's non-squeezing theorem , is one of the most important theorems in symplectic geometry . [ 1 ] It was first proven in 1985 by Mikhail Gromov . [ 2 ] The theorem states that one cannot embed a ball into a cylinder via a symplectic map unless the radius of the ball is less t... | https://en.wikipedia.org/wiki/Non-squeezing_theorem |
A non-standard cosmology is any physical cosmological model of the universe that was, or still is, proposed as an alternative to the then-current standard model of cosmology. The term non-standard is applied to any theory that does not conform to the scientific consensus . Because the term depends on the prevailing con... | https://en.wikipedia.org/wiki/Non-standard_cosmology |
In model theory , a discipline within mathematical logic , a non-standard model is a model of a theory that is not isomorphic to the intended model (or standard model). [ 1 ]
If the intended model is infinite and the language is first-order , then the Löwenheim–Skolem theorems guarantee the existence of non-standard m... | https://en.wikipedia.org/wiki/Non-standard_model |
In mathematical logic , a non-standard model of arithmetic is a model of first-order Peano arithmetic that contains non-standard numbers. The term standard model of arithmetic refers to the standard natural numbers 0, 1, 2, …. The elements of any model of Peano arithmetic are linearly ordered and possess an initial s... | https://en.wikipedia.org/wiki/Non-standard_model_of_arithmetic |
In mathematical logic , a non-standard model of arithmetic is a model of first-order Peano arithmetic that contains non-standard numbers. The term standard model of arithmetic refers to the standard natural numbers 0, 1, 2, …. The elements of any model of Peano arithmetic are linearly ordered and possess an initial s... | https://en.wikipedia.org/wiki/Non-standard_number |
A non-stick surface is engineered to reduce the ability of other materials to stick to it. Non-sticking cookware is a common application, where the non-stick coating allows food to brown without sticking to the pan. Non-stick is often used to refer to surfaces coated with polytetrafluoroethylene (PTFE), a well-known br... | https://en.wikipedia.org/wiki/Non-stick_surface |
Non-stoichiometric compounds are chemical compounds , almost always solid inorganic compounds , having elemental composition whose proportions cannot be represented by a ratio of small natural numbers (i.e. an empirical formula ); most often, in such materials, some small percentage of atoms are missing or too many ato... | https://en.wikipedia.org/wiki/Non-stoichiometric_compound |
Non-stop decay (NSD) is a cellular mechanism of mRNA surveillance to detect mRNA molecules lacking a stop codon and prevent these mRNAs from translation. The non-stop decay pathway releases ribosomes that have reached the far 3' end of an mRNA and guides the mRNA to the exosome complex , or to RNase R in bacteria for s... | https://en.wikipedia.org/wiki/Non-stop_decay |
In the philosophy of mathematics , a non-surveyable proof is a mathematical proof that is considered infeasible for a human mathematician to verify and so of controversial validity . The term was coined by Thomas Tymoczko in 1979 in criticism of Kenneth Appel and Wolfgang Haken 's computer-assisted proof of the four ... | https://en.wikipedia.org/wiki/Non-surveyable_proof |
Non-thermal microwave effects or specific microwave effects have been posited in order to explain unusual observations in microwave chemistry . The main effect of the absorption of microwaves by dielectric materials is a brief displacement in the permanent dipoles which causes rotational entropy. Since the frequency of... | https://en.wikipedia.org/wiki/Non-thermal_microwave_effect |
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