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The Singapore Satellite Positioning Reference Network ( SiReNT ), is an infrastructure network launched by the Survey Services section of the Singapore Land Authority in 2006. [ 1 ] Its purpose is to define Singapore's official spatial reference framework and to support the cadastral system in SVY21. It is a multi-purp... | https://en.wikipedia.org/wiki/SiReNT |
Silicon disulfide is the inorganic compound with the formula Si S 2 . Like silicon dioxide , this material is polymeric , but it adopts a 1-dimensional structure quite different from the usual forms of SiO 2 .
The material is formed by heating silicon and sulfur or by the exchange reaction between SiO 2 and Al 2 S 3 ... | https://en.wikipedia.org/wiki/SiS2 |
Sialic acids are a class of alpha-keto acid sugars with a nine- carbon backbone . [ 1 ] The term "sialic acid" (from Greek σίαλον (síalon) ' saliva ' ) was first introduced by Swedish biochemist Gunnar Blix in 1952. The most common member of this group is N -acetylneuraminic acid (Neu5Ac or NANA) found in animals and s... | https://en.wikipedia.org/wiki/Sialic_acid |
The word, sialome, is a junction of the Greek word for saliva (sialos) and the suffix used in molecular biology to reference a totality of some sort, -ome. [ 1 ] [ 2 ] The name relating to its role in biochemistry.
In biochemistry , the term sialome may refer to two distinct concepts:
Thus, the sialome can refer to t... | https://en.wikipedia.org/wiki/Sialome |
Siamesed cylinders are engine cylinders arranged in such a way that they have no channels between them to allow water or other coolant to circulate. [ 1 ] [ 2 ]
Cylinders are generally arranged in this manner when the engine block is of limited size or when stability of the cylinder bores is of concern, such as in rac... | https://en.wikipedia.org/wiki/Siamesed_cylinders |
Sian Hayley " Leo " Proctor (March 28, 1970) is an American commercial astronaut , geology professor, artist, author, and science communicator. She became the first female commercial spaceship pilot and the first artist selected to go to be an astronaut on the all-civilian Inspiration4 orbital spaceflight , 15 Septembe... | https://en.wikipedia.org/wiki/Sian_Proctor |
Sibelektroterm ( Russian : Сибэлектротерм ) is a manufacturing company in Kirovsky District of Novosibirsk , Russia . It was founded in 1945. [ 1 ] The enterprise is a developer and manufacturer of electrometallurgical equipment. [ 1 ]
The plant produces electric furnaces, gas distribution and mining equipment, agricu... | https://en.wikipedia.org/wiki/Sibelektroterm |
Animals, including siblings, compete for resources such as food, territory, and potential mating partners. In animal sibling rivalry , individuals compete for parental care or limited resources, which can sometimes result in siblicide , the killing of siblings. [ 1 ] Sibling rivalry occurs in many different forms. Sibl... | https://en.wikipedia.org/wiki/Sibling_rivalry_(animals) |
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Siboglinidae is a family of polychaete annelid worms whose members made up the former phyla Pogonophora and Vestimentifera (the giant tube worms ). [ 1 ] [ 2 ] The family is composed of around 100 species of vermiform creatures which live in thin tubes buried in sediment (Pogonophora) or in tubes attached to ... | https://en.wikipedia.org/wiki/Siboglinidae |
cis is a mathematical notation defined by cis x = cos x + i sin x , [ nb 1 ] where cos is the cosine function, i is the imaginary unit and sin is the sine function. x is the argument of the complex number (angle between line to point and x-axis in polar form ). The notation is less commonly used in mathematics than Eul... | https://en.wikipedia.org/wiki/Sich_(mathematics) |
Sicherman dice / ˈ s ɪ k ər m ən / are a pair of 6-sided dice with non-standard numbers—one with the sides 1, 2, 2, 3, 3, 4 and the other with the sides 1, 3, 4, 5, 6, 8. They are notable as the only pair of 6-sided dice that are not normal dice , bear only positive integers , and have the same probability distributio... | https://en.wikipedia.org/wiki/Sicherman_dice |
Sickness behavior is a coordinated set of adaptive behavioral changes that develop in ill individuals during the course of an infection . [ 1 ] They usually, but not always, [ 2 ] accompany fever and aid survival.
Such illness responses include lethargy , depression , anxiety , malaise , loss of appetite , [ 3 ] [ 4 ] ... | https://en.wikipedia.org/wiki/Sickness_behavior |
SICONOS is an open source scientific software primarily targeted at
modeling and simulating non-smooth dynamical systems (NSDS): [ 1 ]
Other applications are found in Systems and Control (hybrid systems, differential inclusions, optimal control with state constraints), Optimization ( Complementarity problem and Variat... | https://en.wikipedia.org/wiki/Siconos |
Siddhānta Śiromaṇi ( Sanskrit : सिद्धान्त शिरोमणि [siddʱɑn̪t̪ᵊ ɕɪɾoməɳiː] for "Crown of treatises") [ 1 ] is the major treatise of Indian mathematician Bhāskara II . [ 2 ] He wrote the Siddhānta Śiromaṇi in 1150 when he was 36 years old. The work is composed in Sanskrit Language in 1450 verses. [ 3 ]
The name of the b... | https://en.wikipedia.org/wiki/Siddhānta_Shiromani |
In geometric topology, the side-approximation theorem was proved by Bing (1963) . It implies that a 2-sphere in R 3 can be approximated by polyhedral 2-spheres.
This topology-related article is a stub . You can help Wikipedia by expanding it . | https://en.wikipedia.org/wiki/Side-approximation_theorem |
A side-stick or sidestick controller is an aircraft control stick that is located on the side console of the pilot , usually on the righthand side, or outboard on a two-seat flightdeck . Typically this is found in aircraft that are equipped with fly-by-wire control systems. [ 1 ]
The throttle controls are typically lo... | https://en.wikipedia.org/wiki/Side-stick |
Branch Side-chain Pendant chain An oligomeric or polymeric offshoot from a macromolecular chain.
Notes
In organic chemistry and biochemistry , a side chain is a chemical group that is attached to a core part of the molecule called the "main chain" or backbone . The side chain is a hydrocarbon branching element of a m... | https://en.wikipedia.org/wiki/Side_chain |
The side effects of penicillin are bodily responses to penicillin and closely related antibiotics that do not relate directly to its effect on bacteria. A side effect is an effect that is not intended with normal dosing. [ 1 ] Some of these reactions are visible and some occur in the body's organs or blood. Penicillins... | https://en.wikipedia.org/wiki/Side_effects_of_penicillin |
A side population (SP) in flow cytometry is a sub-population of cells that is distinct from the main population on the basis of the markers employed. By definition, cells in a side population have distinguishing biological characteristics (for example, they may exhibit stem cell -like characteristics), but the exact na... | https://en.wikipedia.org/wiki/Side_population |
A side reaction is a chemical reaction that occurs at the same time as the actual main reaction, but to a lesser extent. It leads to the formation of by-product , so that the yield of main product is reduced: [ 1 ]
P 1 is the main product if k 1 > k 2 . The by-product P 2 is generally undesirable and must be separated... | https://en.wikipedia.org/wiki/Side_reaction |
Side valleys and tributary valleys are valleys whose brooks or rivers flow into greater ones. [ 1 ]
Upstream, the valleys can be classified in an increasing order which is equivalent to the usual orographic order : the tributaries are ordered from those nearest to the source of the river to those nearest to the mouth ... | https://en.wikipedia.org/wiki/Side_valley |
Sidera Lodoicea / ˈ s ɪ d ər ə ˌ l oʊ d oʊ ˈ ɪ s iː ə / is the name given by the astronomer Giovanni Domenico Cassini to the four moons of Saturn discovered by him in the years 1671, 1672, and 1684 and published in his Découverte de deux nouvelles planètes autour de Saturne in 1673 and in the Journal des sçavans in 168... | https://en.wikipedia.org/wiki/Sidera_Lodoicea |
Sidereal time ("sidereal" pronounced / s aɪ ˈ d ɪər i əl , s ə -/ sy- DEER -ee-əl, sə- ) is a system of timekeeping used especially by astronomers . Using sidereal time and the celestial coordinate system , it is easy to locate the positions of celestial objects in the night sky . Sidereal time is a "time scale that is... | https://en.wikipedia.org/wiki/Sidereal_time |
A sidereal year ( / s aɪ ˈ d ɪər i . əl / , US also / s ɪ -/ ; from Latin sidus ' asterism, star ' ), also called a sidereal orbital period , is the time that Earth or another planetary body takes to orbit the Sun once with respect to the fixed stars .
Hence, for Earth, it is also the time taken for the Sun to return ... | https://en.wikipedia.org/wiki/Sidereal_year |
Siderophilic bacteria are bacteria that require or are facilitated by free iron . They may include Vibrio vulnificus , Listeria monocytogenes , Yersinia enterocolica , Salmonella enterica (serotype Typhimurium), Klebsiella pneumoniae and Escherichia coli . One possible symptom of haemochromatosis is susceptibility to i... | https://en.wikipedia.org/wiki/Siderophilic_bacteria |
Siderophores (Greek: "iron carrier") are small, high-affinity iron - chelating compounds that are secreted by microorganisms such as bacteria and fungi. They help the organism accumulate iron. [ 2 ] [ 3 ] [ 4 ] [ 5 ] Although a widening range of siderophore functions is now being appreciated, [ 6 ] siderophores are amo... | https://en.wikipedia.org/wiki/Siderophore |
In mathematics , LHS is informal shorthand for the left-hand side of an equation . Similarly, RHS is the right-hand side . The two sides have the same value, expressed differently, since equality is symmetric . [ 1 ]
More generally, these terms may apply to an inequation or inequality ; the right-hand side is everyth... | https://en.wikipedia.org/wiki/Sides_of_an_equation |
Sidewalk cycling is the practice of riding bicycles on sidewalks or footpaths , where pedestrians usually have priority. It is controversial, [ 1 ] and is illegal in many countries (including well-known cycling countries such as the Netherlands [ 2 ] and Denmark [ 3 ] ), in some municipalities, [ 4 ] cities [ 5 ] or di... | https://en.wikipedia.org/wiki/Sidewalk_cycling |
Siding or wall cladding is the protective material attached to the exterior side of a wall of a house or other building. Along with the roof, it forms the first line of defense against the elements, most importantly sun, rain/snow, heat and cold, thus creating a stable, more comfortable environment on the interior side... | https://en.wikipedia.org/wiki/Siding_(construction) |
In number theory , a Sidon sequence is a sequence A = { a 0 , a 1 , a 2 , … } {\displaystyle A=\{a_{0},a_{1},a_{2},\dots \}} of natural numbers in which all pairwise sums a i + a j {\displaystyle a_{i}+a_{j}} (for i ≤ j {\displaystyle i\leq j} ) are different. Sidon sequences are also called Sidon sets ; they are named... | https://en.wikipedia.org/wiki/Sidon_sequence |
The Siegbahn notation is used in X-ray spectroscopy to name the spectral lines that are characteristic to elements. It was introduced by Manne Siegbahn .
The characteristic lines in X-ray emission spectra correspond to atomic electronic transitions where an electron jumps down to a vacancy in one of the inner shells o... | https://en.wikipedia.org/wiki/Siegbahn_notation |
Roman–Sasanian wars
Byzantine–Sasanian wars
Year of the Six Emperors (238)
Reign of Gordian III (238–244)
Reign of Philip the Arab (244–249)
Reign of Decius (249–251)
Reign of Trebonianus Gallus (251–253)
Reign of Aemilianus (253)
Reign of Valerian and Gallienus (253–260)
Reign of Gallienus (260–268)
Reign of... | https://en.wikipedia.org/wiki/Siege_of_Dura-Europos_(256) |
The siege of Fort Pitt took place during June and July 1763 in what is now the city of Pittsburgh , Pennsylvania , United States . The siege was a part of Pontiac's War , an effort by Native Americans to remove the Anglo-Americans from the Ohio Country and Allegheny Plateau after they refused to honor their promises an... | https://en.wikipedia.org/wiki/Siege_of_Fort_Pitt |
The siege of Laghouat was an episode of the French pacification of Algeria . General Aimable Pélissier commanding an army of 6,000, besieged the city of Laghouat from 21 November until 4 December 1852, when the city capitulated. The brutal treatment of the inhabitants was part of the scorched earth tactic of the Frenc... | https://en.wikipedia.org/wiki/Siege_of_Laghouat |
In mathematics , specifically in transcendental number theory and Diophantine approximation , Siegel's lemma refers to bounds on the solutions of linear equations obtained by the construction of auxiliary functions . The existence of these polynomials was proven by Axel Thue ; [ 1 ] Thue's proof used what would be tran... | https://en.wikipedia.org/wiki/Siegel's_lemma |
Siegel's paradox is the phenomenon that uncertainty about future prices can theoretically push rational consumers to temporarily trade away their preferred consumption goods (or currency) for non-preferred goods (or currency), as part of a plan to trade back to the preferred consumption goods after prices become cleare... | https://en.wikipedia.org/wiki/Siegel's_paradox |
In mathematics , Siegel's theorem on integral points states that a curve of genus greater than zero has only finitely many integral points over any given number field .
The theorem was first proved in 1929 by Carl Ludwig Siegel and was the first major result on Diophantine equations that depended only on the genus and... | https://en.wikipedia.org/wiki/Siegel's_theorem_on_integral_points |
In mathematics , Siegel's identity refers to one of two formulae that are used in the resolution of Diophantine equations .
The first formula is
The second is
The identities are used in translating Diophantine problems connected with integral points on hyperelliptic curves into S-unit equations . | https://en.wikipedia.org/wiki/Siegel_identity |
In mathematics , the Siegel–Weil formula , introduced by Weil ( 1964 , 1965 ) as an extension of the results of Siegel ( 1951 , 1952 ), expresses an Eisenstein series as a weighted average of theta series of lattices in a genus , where the weights are proportional to the inverse of the order of the automorphism group ... | https://en.wikipedia.org/wiki/Siegel–Weil_formula |
Siemens A50 is a mobile phone manufactured by Siemens Mobile . [ 1 ] [ 2 ] It was one of the best sold mobile phones from 2002. [ 3 ] The phone was announced in October 2002. [ 4 ]
The phone included a WAP browser and two games: Stack Attack and Balloon Shooter. [ 5 ]
This mobile technology –related article is a stub... | https://en.wikipedia.org/wiki/Siemens_A50 |
Siemens Mobility GmbH is a division of Siemens . With its global headquarters in Munich , Siemens Mobility has four core business units: Mobility Management, dedicated to rail technology and intelligent traffic systems, Railway Electrification, Rolling Stock, and Customer Services. [ 3 ]
Innovations from the late 19th... | https://en.wikipedia.org/wiki/Siemens_Mobility |
Sierpiński's constant is a mathematical constant usually denoted as K . One way of defining it is as the following limit:
where r 2 ( k ) is a number of representations of k as a sum of the form a 2 + b 2 for integer a and b .
It can be given in closed form as:
where ϖ {\displaystyle \varpi } is the lemniscate const... | https://en.wikipedia.org/wiki/Sierpiński's_constant |
In mathematics , Sierpiński's theorem is an isomorphism theorem concerning certain metric spaces , named after Wacław Sierpiński who proved it in 1920. [ 1 ]
It states that any countable metric space without isolated points is homeomorphic to Q {\displaystyle \mathbb {Q} } (with its standard topology). [ 1 ] [ 2 ] [ 3... | https://en.wikipedia.org/wiki/Sierpiński's_theorem_on_metric_spaces |
Sierra Wireless (a subsidiary of Semtech Corporation) is a Canadian multinational wireless communications equipment designer, manufacturer and services provider headquartered in Richmond, British Columbia , Canada. It also maintains offices and operations in the United States, Korea, Japan, Taiwan, India, France, Austr... | https://en.wikipedia.org/wiki/Sierra_Wireless |
A sieve analysis (or gradation test ) is a practice or procedure used in geology, civil engineering , [ 1 ] and chemical engineering [ 2 ] to assess the particle size distribution (also called gradation ) of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh si... | https://en.wikipedia.org/wiki/Sieve_analysis |
The sievert (symbol: Sv [ note 1 ] ) is a derived unit in the International System of Units (SI) intended to represent the stochastic health risk of ionizing radiation , which is defined as the probability of causing radiation-induced cancer and genetic damage. The sievert is important in dosimetry and radiation protec... | https://en.wikipedia.org/wiki/Sievert |
Sieverts's law , in physical metallurgy and in chemistry , is a rule to predict the solubility of gases in metals . It is named after German chemist Adolf Sieverts (1874–1947). [ 1 ] The law states that the solubility of a diatomic gas in metal is proportional to the square root of the partial pressure of the gas in th... | https://en.wikipedia.org/wiki/Sieverts's_law |
In mass transfer , the sieving coefficient is a measure of equilibration between the concentrations of two mass transfer streams. It is defined as the mean pre- and post-contact concentration of the mass receiving stream divided by the pre- and post-contact concentration of the mass donating stream.
S = C r C d {\dis... | https://en.wikipedia.org/wiki/Sieving_coefficient |
SigMF is a standard file format for storing and organizing digitized radio frequency (RF) signals and corresponding metadata, supporting time series real or complex-valued signals. [ 1 ] [ 2 ] A single SigMF "Recording" consists of two files: 1) a binary file containing only the time series digitized samples, and 2) a ... | https://en.wikipedia.org/wiki/SigMF |
SigSpoof ( CVE - 2018-12020 ) is a family of security vulnerabilities that affected the software package GNU Privacy Guard ("GnuPG") since version 0.2.2, that was released in 1998. [ 1 ] Several other software packages that make use of GnuPG were also affected, such as Pass and Enigmail . [ 2 ] [ 1 ]
In un- patched ve... | https://en.wikipedia.org/wiki/SigSpoof |
A sight glass or water gauge is a type of level sensor , a transparent tube through which the operator of a tank or boiler can observe the level of liquid contained within.
Simple sight glasses may be just a plastic or glass tube connected to the bottom of the tank at one end and the top of the tank at the other. The... | https://en.wikipedia.org/wiki/Sight_glass |
In astronavigation , sight reduction is the process of deriving from a sight (in celestial navigation usually obtained using a sextant ) the information needed for establishing a line of position , generally by intercept method .
Sight is defined as the observation of the altitude, and sometimes also the azimuth , of ... | https://en.wikipedia.org/wiki/Sight_reduction |
27346
69071
ENSG00000109084
ENSMUSG00000037278
Q5BJF2
Q8VD00
NM_014573
NM_133706
NP_055388
NP_598467
The sigma-2 receptor ( σ 2 R ) is a sigma receptor subtype that has attracted attention due to its involvement in diseases such as neurological diseases , neurodegenerative , neuro-ophthalmic and cancer . It i... | https://en.wikipedia.org/wiki/Sigma-2_receptor |
The Sigma-D relation , or Σ-D Relation , is the claimed relation between the radio surface brightness and diameter of a supernova remnant . It is generally regarded as of limited physical use, since it has very large scatter and is dominated by observational selection biases. [ 1 ] [ 2 ]
This astrophysics -related art... | https://en.wikipedia.org/wiki/Sigma-D_relation |
In organometallic chemistry , sigma-bond metathesis is a chemical reaction wherein a metal-ligand sigma bond undergoes metathesis (exchange of parts) with the sigma bond in some reagent. The reaction is illustrated by the exchange of lutetium (III) methyl complex with a hydrocarbon (R-H): [ 1 ]
This reactivity was fi... | https://en.wikipedia.org/wiki/Sigma-bond_metathesis |
The σ-π model and equivalent-orbital model refer to two possible representations of molecules in valence bond theory . The σ-π model differentiates bonds and lone pairs of σ symmetry from those of π symmetry, while the equivalent-orbital model hybridizes them . The σ-π treatment takes into account molecular symmetry an... | https://en.wikipedia.org/wiki/Sigma-pi_and_equivalent-orbital_models |
In chemistry , sigma bonds ( σ bonds ) or sigma overlap are the strongest type of covalent chemical bond . [ 1 ] They are formed by head-on overlapping between atomic orbitals along the internuclear axis. Sigma bonding is most simply defined for diatomic molecules using the language and tools of symmetry groups . In t... | https://en.wikipedia.org/wiki/Sigma_bond |
The sEDA parameter ( sigma electron donor-acceptor ) is a sigma-electron substituent effect scale, described also as inductive and electronegativity related effect. There is also a complementary scale - pEDA . The more positive is the value of sEDA the more sigma-electron donating is a substituent. The more negative sE... | https://en.wikipedia.org/wiki/Sigma_electron_donor-acceptor |
A sigma factor ( σ factor or specificity factor ) is a protein needed for initiation of transcription in bacteria . [ 1 ] [ 2 ] It is a bacterial transcription initiation factor that enables specific binding of RNA polymerase (RNAP) to gene promoters . It is homologous to archaeal transcription factor B and to eukaryot... | https://en.wikipedia.org/wiki/Sigma_factor |
Sigma heat , denoted S {\displaystyle S} , is a measure of the specific energy of humid air. It is used in the field of mining engineering for calculations relating to the temperature regulation of mine air. Sigma heat is sometimes called total heat , [ 1 ] although total heat may instead mean enthalpy . [ 2 ]
Sigma ... | https://en.wikipedia.org/wiki/Sigma_heat |
In chemistry , sigma hole interactions (or σ-hole interactions ) are a family of intermolecular forces that can occur between several classes of molecules and arise from an energetically stabilizing interaction between a positively-charged site, termed a sigma hole , and a negatively-charged site, typically a lone pair... | https://en.wikipedia.org/wiki/Sigma_hole_interactions |
In physics , a sigma model is a field theory that describes the field as a point particle confined to move on a fixed manifold. This manifold can be taken to be any Riemannian manifold , although it is most commonly taken to be either a Lie group or a symmetric space . The model may or may not be quantized. An example ... | https://en.wikipedia.org/wiki/Sigma_model |
Sigma non-innocence is a special form of non-innocence , an oxidation characteristic in metal complexes . It is mainly discussed in coordination complexes of late transition metals in their high formal oxidation states. Complexes exhibiting sigma non-innocence differ from classical Werner coordination complexes in that... | https://en.wikipedia.org/wiki/Sigma_non-innocence |
In organic chemistry , a sigmatropic reaction (from Greek τρόπος (trópos) ' turn ' ) is a pericyclic reaction wherein the net result is one sigma bond (σ-bond) is changed to another σ-bond in an intramolecular reaction . [ 1 ] In this type of rearrangement reaction , a substituent moves from one part of a π-system to a... | https://en.wikipedia.org/wiki/Sigmatropic_reaction |
A sign-value notation represents numbers using a sequence of numerals which each represent a distinct quantity, regardless of their position in the sequence. Sign-value notations are typically additive, subtractive, or multiplicative depending on their conventions for grouping signs together to collectively represent n... | https://en.wikipedia.org/wiki/Sign-value_notation |
In computer science , the sign bit is a bit in a signed number representation that indicates the sign of a number. Although only signed numeric data types have a sign bit, it is invariably located in the most significant bit position, [ 1 ] so the term may be used interchangeably with "most significant bit" in some co... | https://en.wikipedia.org/wiki/Sign_bit |
Sign extension (sometimes abbreviated as sext , particularly in mnemonics ) is the operation, in computer arithmetic , of increasing the number of bits of a binary number while preserving the number's sign (positive/negative) and value. This is done by appending digits to the most significant side of the number, follow... | https://en.wikipedia.org/wiki/Sign_extension |
The sign of the horns is a hand gesture with a variety of meanings and uses in various cultures. It is formed by extending the index and little fingers while holding the middle and ring fingers down with the thumb.
In Hatha Yoga , a similar hand gesture – with the tips of middle and ring finger touching the thumb – is... | https://en.wikipedia.org/wiki/Sign_of_the_horns |
In mathematics , a sign sequence , or ±1–sequence or bipolar sequence , is a sequence of numbers, each of which is either 1 or −1. One example is the sequence (1, −1, 1, −1, ...).
Such sequences are commonly studied in discrepancy theory .
Around 1932, mathematician Paul Erdős conjectured that for any infinite ±1-seq... | https://en.wikipedia.org/wiki/Sign_sequence |
A signal is both the process and the result of transmission of data over some media accomplished by embedding some variation. Signals are important in multiple subject fields including signal processing , information theory and biology .
In signal processing, a signal is a function that conveys information about a phe... | https://en.wikipedia.org/wiki/Signal |
A signal-flow graph or signal-flowgraph ( SFG ), invented by Claude Shannon , [ 1 ] but often called a Mason graph after Samuel Jefferson Mason who coined the term, [ 2 ] is a specialized flow graph , a directed graph in which nodes represent system variables, and branches (edges, arcs, or arrows) represent functional ... | https://en.wikipedia.org/wiki/Signal-flow_graph |
The signal-to-crosstalk ratio at a specified point in a circuit is the ratio of the power of the wanted signal to the power of the unwanted signal from another channel .
The signals are adjusted in each channel so that they are of equal power at the zero transmission level point in their respective channels.
The sign... | https://en.wikipedia.org/wiki/Signal-to-crosstalk_ratio |
In information theory and telecommunication engineering, the signal-to-interference-plus-noise ratio ( SINR [ 1 ] ) (also known as the signal-to-noise-plus-interference ratio ( SNIR ) [ 2 ] ) is a quantity used to give theoretical upper bounds on channel capacity (or the rate of information transfer) in wireless commu... | https://en.wikipedia.org/wiki/Signal-to-interference-plus-noise_ratio |
The signal-to-interference ratio ( SIR or S/I ), also known as the carrier-to-interference ratio ( CIR or C/I ), is the quotient between the average received modulated carrier power S or C and the average received co-channel interference power I , i.e. crosstalk , from other transmitters than the useful signal. [ 1 ] [... | https://en.wikipedia.org/wiki/Signal-to-interference_ratio |
Signal-to-noise ratio ( SNR or S/N ) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise . SNR is defined as the ratio of signal power to noise power , often expressed in decibels . A ratio higher than 1:1 (greater than 0 dB) indicates more signal th... | https://en.wikipedia.org/wiki/Signal-to-noise_ratio |
Signal-to-noise ratio ( SNR ) is used in imaging to characterize image quality . The sensitivity of a (digital or film) imaging system is typically described in the terms of the signal level that yields a threshold level of SNR.
Industry standards define sensitivity in terms of the ISO film speed equivalent, using SN... | https://en.wikipedia.org/wiki/Signal-to-noise_ratio_(imaging) |
Signal-to-quantization-noise ratio ( SQNR or SN q R ) is widely used quality measure in analysing digitizing schemes such as pulse-code modulation (PCM). The SQNR reflects the relationship between the maximum nominal signal strength and the quantization error (also known as quantization noise) introduced in the analog-... | https://en.wikipedia.org/wiki/Signal-to-quantization-noise_ratio |
Signal/One was a manufacturer of high performance SSB and CW HF radio communications transceivers initially based in St. Petersburg , Florida , United States.
Signal/One's parent company was Electronic Communications, Inc. (ECI), a military division of NCR Corporation located in St. Petersburg, Florida . Key Signal/On... | https://en.wikipedia.org/wiki/Signal/One |
A signal analyzer is an instrument that measures the magnitude and phase of the input signal at a single frequency within the IF bandwidth of the instrument. It employs digital techniques to extract useful information that is carried by an electrical signal. [ 1 ] In common usage the term is related to both spectrum an... | https://en.wikipedia.org/wiki/Signal_analyzer |
In electronics and signal processing , signal conditioning is the manipulation of an analog signal in such a way that it meets the requirements of the next stage for further processing.
In an analog-to-digital converter (ADC) application, signal conditioning includes voltage or current limiting and anti-aliasing filte... | https://en.wikipedia.org/wiki/Signal_conditioning |
A signal passed at danger ( SPAD ) [ 1 ] : 75 is an event on a railway where a train passes a stop signal without authority. [ 2 ] This is also known as running a red , in the United States as a stop signal overrun (SSO) [ 3 ] and in Canada as passing a stop signal . [ 4 ] SPAD is defined by Directive 2014/88/EU as any... | https://en.wikipedia.org/wiki/Signal_passed_at_danger |
A signal peptide (sometimes referred to as signal sequence , targeting signal , localization signal , localization sequence , transit peptide , leader sequence or leader peptide ) is a short peptide (usually 16–30 amino acids long) [ 1 ] present at the N-terminus (or occasionally nonclassically at the C-terminus [ 2 ]... | https://en.wikipedia.org/wiki/Signal_peptide |
SIGNAL is a programming language based on synchronized dataflow (flows + synchronization): a process is a set of equations on elementary flows describing both data and control. [ 1 ]
The SIGNAL formal model provides the capability to describe systems with several clocks [ 2 ] [ 3 ] (polychronous systems) as relational... | https://en.wikipedia.org/wiki/Signal_programming |
In telecommunications , signal reflection happens when a signal is transmitted along a transmission medium (such as a copper cable or an optical fiber ) and part of it is reflected back toward the source instead of reaching the end. This reflection is caused by imperfections or physical variations in the cable (such as... | https://en.wikipedia.org/wiki/Signal_reflection |
In telecommunications , particularly in radio frequency engineering , signal strength is the transmitter power output as received by a reference antenna at a distance from the transmitting antenna. High-powered transmissions, such as those used in broadcasting , are measured in dB - millivolts per metre (dBmV/m). For ... | https://en.wikipedia.org/wiki/Signal_strength_in_telecommunications |
Signal transduction is the process by which a chemical or physical signal is transmitted through a cell as a series of molecular events . Proteins responsible for detecting stimuli are generally termed receptors , although in some cases the term sensor is used. [ 1 ] The changes elicited by ligand binding (or signal se... | https://en.wikipedia.org/wiki/Signal_transduction |
In telecommunications , transmission (sometimes abbreviated as "TX") is the process of sending or propagating an analog or digital signal via a medium that is wired , wireless , or fiber-optic . [ 1 ] [ 2 ]
Transmission system technologies typically refer to physical layer protocol duties such as modulation , demodula... | https://en.wikipedia.org/wiki/Signal_transmission |
Signaling Gateway is a web portal dedicated to signaling pathways powered by the San Diego Supercomputer Center at the University of California, San Diego . It was initiated [ 1 ] by a collaboration between the Alliance for Cellular Signaling and Nature . A primary feature is the Molecule Pages database.
Signaling Gat... | https://en.wikipedia.org/wiki/Signaling_Gateway_(website) |
For data compression , signaling compression , or SigComp , is a compression method designed especially for compression of text-based communication data as SIP or RTSP . SigComp had originally been defined in RFC 3320 and was later updated with RFC 4896. A Negative Acknowledgement Mechanism for Signaling Compression is... | https://en.wikipedia.org/wiki/Signaling_compression |
Signalling (or signaling ; see spelling differences ) in contract theory is the idea that one party (the agent ) credibly conveys some information about itself to another party (the principal ).
Signalling was already discussed and mentioned in the seminal Theory of Games and Economic Behavior , which is considered to ... | https://en.wikipedia.org/wiki/Signalling_(economics) |
Signature-tagged mutagenesis ( STM ) is a genetic technique used to study gene function. Recent advances in genome sequencing have allowed us to catalogue a large variety of organisms' genomes, but the function of the genes they contain is still largely unknown. Using STM, the function of the product of a particular ge... | https://en.wikipedia.org/wiki/Signature-tagged_mutagenesis |
In logic , especially mathematical logic , a signature lists and describes the non-logical symbols of a formal language . In universal algebra , a signature lists the operations that characterize an algebraic structure . In model theory , signatures are used for both purposes. They are rarely made explicit in more phil... | https://en.wikipedia.org/wiki/Signature_(logic) |
In mathematical notation for numbers , a signed-digit representation is a positional numeral system with a set of signed digits used to encode the integers .
Signed-digit representation can be used to accomplish fast addition of integers because it can eliminate chains of dependent carries. [ 1 ] In the binary numeral... | https://en.wikipedia.org/wiki/Signed-digit_representation |
In mathematics , the sign of a real number is its property of being either positive, negative , or 0 . Depending on local conventions, zero may be considered as having its own unique sign, having no sign, or having both positive and negative sign. In some contexts, it makes sense to distinguish between a positive and a... | https://en.wikipedia.org/wiki/Signed_direction |
In the area of graph theory in mathematics , a signed graph is a graph in which each edge has a positive or negative sign.
A signed graph is balanced if the product of edge signs around every cycle is positive. The name "signed graph" and the notion of balance appeared first in a mathematical paper of Frank Harary in... | https://en.wikipedia.org/wiki/Signed_graph |
In computing, a signed overpunch is a coding scheme which stores the sign of a number by changing (usually) the last digit. It is used in character data on IBM mainframes by languages such as COBOL , PL/I , and RPG . [ 1 ] Its purpose is to save a character that would otherwise be used by the sign digit. [ 2 ] The code... | https://en.wikipedia.org/wiki/Signed_overpunch |
In computing, signedness is a property of data types representing numbers in computer programs. A numeric variable is signed if it can represent both positive and negative numbers, and unsigned if it can only represent non-negative numbers (zero or positive numbers).
As signed numbers can represent negative numbers, t... | https://en.wikipedia.org/wiki/Signedness |
Microarray analysis techniques are used in interpreting the data generated from experiments on DNA ( Gene chip analysis ), RNA, and protein microarrays , which allow researchers to investigate the expression state of a large number of genes – in many cases, an organism's entire genome – in a single experiment. [ 1 ] Su... | https://en.wikipedia.org/wiki/Significance_analysis_of_microarrays |
The significand [ 1 ] (also coefficient , [ 1 ] sometimes argument , [ 2 ] or more ambiguously mantissa , [ 3 ] fraction , [ 4 ] [ 5 ] [ nb 1 ] or characteristic [ 6 ] [ 3 ] ) is the first (left) part of a number in scientific notation or related concepts in floating-point representation, consisting of its significant ... | https://en.wikipedia.org/wiki/Significand |
The Significant New Alternatives Policy (also known as Section 612 of the Clean Air Act or SNAP , promulgated at 40 CFR part 82 Subpart G) is a program of the EPA to determine acceptable chemical substitutes, and establish which are prohibited or regulated by the EPA. [ 1 ] It also establishes a program by which new al... | https://en.wikipedia.org/wiki/Significant_New_Alternatives_Policy |
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