searching for Entropy (astrophysics) 195 found (3405 total)

alternate case: entropy (astrophysics)

Standard molar entropy (433 words) [view diff] no match in snippet view article find links to article

In chemistry, the standard molar entropy is the entropy content of one mole of substance, under standard conditions (not standard temperature and pressureEntropy encoding (318 words) [view diff] no match in snippet view article find links to article

In information theory an entropy encoding is a lossless data compression scheme that is independent of the specific characteristics of the medium. OneEntropy (information theory) (6,276 words) [view diff] no match in snippet view article find links to article

In information theory, entropy is the average amount of information contained in each message received. Here, message stands for an event, sample or characterEntropy (9,968 words) [view diff] no match in snippet view article find links to article

This article is about entropy in thermodynamics. For other uses, see Entropy (disambiguation). For a more accessible and less technical introductionMeasure-preserving dynamical system (866 words) [view diff] no match in snippet view article find links to article

the measure-theoretic entropy of a dynamical system. The entropy of a partition Q is defined as The measure-theoretic entropy of a dynamical systemRényi entropy (1,280 words) [view diff] no match in snippet view article find links to article

theory, the Rényi entropy generalizes the Shannon entropy, the Hartley entropy, the min-entropy, and the collision entropy. Entropies quantify the diversityFree entropy (432 words) [view diff] no match in snippet view article find links to article

A thermodynamic free entropy is an entropic thermodynamic potential analogous to the free energy. Also known as a Massieu, Planck, or Massieu–Planck potentialsEntropy of vaporization (168 words) [view diff] no match in snippet view article find links to article

to be confused with Enthalpy of vaporization. The entropy of vaporization is the increase in entropy upon vaporization of a liquid. This is always positiveEntropy of fusion (237 words) [view diff] no match in snippet view article find links to article

The entropy of fusion is the increase in entropy when melting a substance. This is almost always positive since the degree of disorder increases in theNegentropy (1,099 words) [view diff] no match in snippet view article find links to article

negentropy, also negative entropy or syntropy or extropy or entaxy, of a living system is the entropy that it exports to keep its own entropy low; it lies at theOrders of magnitude (entropy) (118 words) [view diff] no match in snippet view article find links to article

entropy. Orders of magnitude (data) Order of magnitude (terminology) Jean-Bernard Brissaud (14 February 2005). "The Meaning of Entropy". Entropy,Principle of maximum entropy (2,728 words) [view diff] no match in snippet view article find links to article

learning, see maximum entropy classifier. For other uses, see maximum entropy (disambiguation). The principle of maximum entropy states that, subjectEntropy monitoring (440 words) [view diff] no match in snippet view article find links to article

Entropy monitoring is a method of assessing anaesthetic depth. It was commercially developed by Datex-Ohmeda, now part of GE Healthcare. It relies onBoltzmann's entropy formula (949 words) [view diff] no match in snippet view article find links to article

mechanics, Boltzmann's equation is a probability equation relating the entropy S of an ideal gas to the quantity W, which is the number of microstatesThe Entropy Tango (66 words) [view diff] no match in snippet view article find links to article

The Entropy Tango is a novel by British fantasy and science fiction writer Michael Moorcock. It is part of his long running Jerry Cornelius series.Differential entropy (1,400 words) [view diff] no match in snippet view article find links to article

Differential entropy (also referred to as continuous entropy) is a concept in information theory that extends the idea of (Shannon) entropy, a measure ofNonextensive entropy (90 words) [view diff] no match in snippet view article find links to article

has proposed a nonextensive entropy (Tsallis entropy), which is a generalization of the traditional Boltzmann–Gibbs entropy. The rationale behind the theoryEntropy (statistical thermodynamics) (2,262 words) [view diff] no match in snippet view article find links to article

mechanics, the entropy function earlier introduced by Clausius is changed to statistical entropy using probability theory. The statistical entropy perspectiveConditional quantum entropy (352 words) [view diff] no match in snippet view article find links to article

conditional quantum entropy is an entropy measure used in quantum information theory. It is a generalization of the conditional entropy of classical informationJoint entropy (178 words) [view diff] no match in snippet view article find links to article

information theory, joint entropy is a measure of the uncertainty associated with a set of variables. The joint Shannon entropy of two variables andVon Neumann entropy (1,868 words) [view diff] no match in snippet view article find links to article

statistical mechanics, the von Neumann entropy, named after John von Neumann, is the extension of classical Gibbs entropy concepts to the field of quantum mechanicsMaximum entropy probability distribution (1,458 words) [view diff] no match in snippet view article find links to article

statistics and information theory, a maximum entropy probability distribution is a probability distribution whose entropy is at least as great as that of all otherConformational entropy (470 words) [view diff] no match in snippet view article find links to article

Conformational entropy is the entropy associated with the physical arrangement of a polymer chain that assumes a compact or globular state in solutionBinary entropy function (392 words) [view diff] no match in snippet view article find links to article

In information theory, the binary entropy function, denoted or , is defined as the entropy of a Bernoulli process with probability of success p. MathematicallyConditional entropy (344 words) [view diff] no match in snippet view article find links to article

In information theory, the conditional entropy (or equivocation) quantifies the amount of information needed to describe the outcome of a random variableIntroduction to entropy (2,973 words) [view diff] no match in snippet view article find links to article

the main encyclopedia article, see Entropy. The idea of "irreversibility" is central to the understanding of entropy. Everyone has an intuitive understandingEntropy (classical thermodynamics) (1,975 words) [view diff] no match in snippet view article find links to article

Entropy is a property of thermodynamical systems invented by Rudolf Clausius who named it from the Greek word τρoπή, "transformation". Later Ludwig BoltzmannCross entropy (806 words) [view diff] no match in snippet view article find links to article

In information theory, the cross entropy between two probability distributions over the same underlying set of events measures the average number of bitsEntropy (Buffy the Vampire Slayer) (1,601 words) [view diff] no match in snippet view article find links to article

"Entropy" is the 18th episode of season 6 of the television series Buffy the Vampire Slayer. The Trio, riding ATVs, pursue two vampires through a cemetery;Entropy (energy dispersal) (2,354 words) [view diff] no match in snippet view article find links to article

The description of entropy as energy dispersal provides an introductory method of teaching the thermodynamic concept of entropy. In physics and physicalConfiguration entropy (410 words) [view diff] no match in snippet view article find links to article

In statistical mechanics, configuration entropy is the portion of a system's entropy that is related to the position of its constituent particles ratherMaximum entropy spectral estimation (385 words) [view diff] no match in snippet view article find links to article

Maximum entropy spectral estimation is a method of spectral density estimation. The goal is to improve the spectral quality based on the principle ofQ-exponential distribution (362 words) [view diff] no match in snippet view article find links to article

probability distribution arising from the maximization of the Tsallis entropy under appropriate constraints, including constraining the domain to beEntropy rate (240 words) [view diff] no match in snippet view article find links to article

In the mathematical theory of probability, the entropy rate or source information rate of a stochastic process is, informally, the time density of theEntropy (comics) (373 words) [view diff] no match in snippet view article find links to article

Entropy is a Cosmic Entity in the Marvel Comics Universe who possesses Nigh-Omnipotence. A representation of Eternity formed at the beginning of timeTemperature–entropy diagram (134 words) [view diff] no match in snippet view article find links to article

diagram. A temperature entropy diagram, or T-s diagram, is used in thermodynamics to visualize changes to temperature and specific entropy during a thermodynamicEntropy (film) (47 words) [view diff] no match in snippet view article find links to article

Entropy is a 1999 film directed by Phil Joanou, starring Stephen Dorff and featuring the Irish rock band U2. The film is largely autobiographical, coveringInformation theory (4,770 words) [view diff] no match in snippet view article find links to article

information is entropy, which is usually expressed by the average number of bits needed to store or communicate one symbol in a message. Entropy quantifiesJoint quantum entropy (575 words) [view diff] no match in snippet view article find links to article

The joint quantum entropy generalizes the classical joint entropy to the context of quantum information theory. Intuitively, given two quantum statesEntropy (arrow of time) (4,828 words) [view diff] no match in snippet view article find links to article

Entropy is the only quantity in the physical sciences (apart from certain rare interactions in particle physics; see below) that requires a particularCross-entropy method (701 words) [view diff] no match in snippet view article find links to article

The cross-entropy (CE) method attributed to Reuven Rubinstein is a general Monte Carlo approach to combinatorial and continuous multi-extremal optimizationTopological entropy (1,063 words) [view diff] no match in snippet view article find links to article

article is about entropy in geometry and topology. For other uses, see Entropy (disambiguation). In mathematics, the topological entropy of a topologicalHistory of entropy (2,297 words) [view diff] no match in snippet view article find links to article

The concept of entropy developed in response to the observation that a certain amount of functional energy released from combustion reactions is alwaysEntropy (computing) (1,516 words) [view diff] no match in snippet view article find links to article

In computing, entropy is the randomness collected by an operating system or application for use in cryptography or other uses that require random dataEntropy and life (2,978 words) [view diff] no match in snippet view article find links to article

Research concerning the relationship between the thermodynamic quantity entropy and the evolution of life began around the turn of the 20th century. InBlack hole thermodynamics (1,851 words) [view diff] no match in snippet view article find links to article

(its) entropy as it falls in, giving a decrease in entropy. Generalized second law introduced as total entropy = black hole entropy + outside entropy. ExtremalEntropy / Send Them (867 words) [view diff] no match in snippet view article find links to article

'"Send Them/Entropy (Hip Hop Reconstruction from the Ground Up)"', is a double A side EP by Asia Born (now known as Lyrics Born) and DJ Shadow and theHeat death of the universe (2,155 words) [view diff] no match in snippet view article find links to article

this is when the Universe reaches thermodynamic equilibrium (maximum entropy). The hypothesis of heat death stems from the ideas of William ThomsonEntropy (journal) (117 words) [view diff] no match in snippet view article find links to article

Entropy is a peer-reviewed open access scientific journal covering research on all aspects of entropy and information studies. It was established in 1999The English Assassin: A Romance of Entropy (196 words) [view diff] no match in snippet view article find links to article

Assassin: A Romance of Entropy is a novel by British fantasy and science fiction writer Michael Moorcock [1]. Subtitled "A romance of entropy" it was the thirdTsallis entropy (1,612 words) [view diff] no match in snippet view article find links to article

In physics, the Tsallis entropy is a generalization of the standard Boltzmann–Gibbs entropy. It was introduced in 1988 by Constantino Tsallis as a basisEntropy of entanglement (311 words) [view diff] no match in snippet view article find links to article

The entropy of entanglement is an entanglement measure for many-body quantum state. Bipartite entanglement entropy is defined with respect to a bipartitionTopological entropy in physics (293 words) [view diff] no match in snippet view article find links to article

entropy[1] [2], usually denoted by γ, is a number characterizing many-body states that possess topological order. The short form topological entropy isEntropy in thermodynamics and information theory (2,989 words) [view diff] no match in snippet view article find links to article

close parallels between the mathematical expressions for the thermodynamic entropy, usually denoted by S, of a physical system in the statistical thermodynamicsIsentropic process (901 words) [view diff] no match in snippet view article find links to article

process (ισον = "equal" (Greek); εντροπία entropy = "disorder"(Greek)) is a thermodynamic process such that the entropy of the system remains constant throughoutVolume entropy (524 words) [view diff] no match in snippet view article find links to article

The volume entropy is an asymptotic invariant of a compact Riemannian manifold that measures the exponential growth rate of the volume of metric ballsEnthalpy–entropy chart (719 words) [view diff] no match in snippet view article find links to article

An enthalpy–entropy chart, also known as the h–s chart or Mollier diagram, plots the total heat against entropy, describing the enthalpy of a thermodynamicEntropy (order and disorder) (2,692 words) [view diff] no match in snippet view article find links to article

In thermodynamics, entropy is commonly associated with the amount of order, disorder, or chaos in a thermodynamic system. This stems from Rudolf Clausius'Linear entropy (230 words) [view diff] no match in snippet view article find links to article

theory, the linear entropy or impurity of a state is a scalar defined as where ρ is the density matrix of the state. The linear entropy can range betweenLoop entropy (263 words) [view diff] no match in snippet view article find links to article

Loop entropy is the entropy lost upon bringing together two residues of a polymer within a prescribed distance. For a single loop, the entropy variesMaximum-entropy Markov model (751 words) [view diff] no match in snippet view article find links to article

Nordic combined skier, see Silvio Memm. In machine learning, a maximum-entropy Markov model (MEMM), or conditional Markov model (CMM), is a graphicalQuantum relative entropy (898 words) [view diff] no match in snippet view article find links to article

quantum relative entropy is a measure of distinguishability between two quantum states. It is the quantum mechanical analog of relative entropy. For simplicitySoftware entropy (260 words) [view diff] no match in snippet view article find links to article

be confused with information entropy. A work on software engineering by Ivar Jacobson et al. describes software entropy as follows: The second law ofEntropy (album) (48 words) [view diff] no match in snippet view article find links to article

Entropy is a split vinyl album by Anathallo and Javelins. Each band has one song featured on the album, released in 2005 on Potential Getaway Driver.Transfer entropy (630 words) [view diff] no match in snippet view article find links to article

Transfer entropy is a non-parametric statistic measuring the amount of directed (time-asymmetric) transfer of information between two random processesEntropy (1977 board game) (549 words) [view diff] no match in snippet view article find links to article

For the 1994 game, see Entropy (1994 board game). Entropy is an abstract strategy board game for two players designed by Eric Solomon in 1977. The gameThird law of thermodynamics (2,524 words) [view diff] no match in snippet view article find links to article

properties of systems in equilibrium at absolute zero temperature: The entropy of a perfect crystal, at absolute zero (zero kelvins), is exactly equalQuantum statistical mechanics (825 words) [view diff] no match in snippet view article find links to article

Main article: Von Neumann entropy Of particular significance for describing randomness of a state is the von Neumann entropy of S formally defined byNon-equilibrium thermodynamics (5,837 words) [view diff] no match in snippet view article find links to article

discussed below. Another fundamental difference is the difficulty in defining entropy in macroscopic terms for systems not in thermodynamic equilibrium. Non-equilibriumBousso's holographic bound (254 words) [view diff] no match in snippet view article find links to article

generalization of the black hole entropy bound (cf. holographic principle) to generic systems is that, in quantum gravity, the maximum entropy which can be enclosedBoltzmann constant (1,755 words) [view diff] no match in snippet view article find links to article

constant NA: It has the same dimension (energy divided by temperature) as entropy. The accepted value in SI units is 1.3806488(13)×10−23 J/K. Boltzmann'sEntropy power inequality (300 words) [view diff] no match in snippet view article find links to article

entropy power inequality is a result in information theory that relates to so-called "entropy power" of random variables. It shows that the entropy powerSackur–Tetrode equation (636 words) [view diff] no match in snippet view article find links to article

The Sackur–Tetrode equation is an expression for the entropy of a monatomic classical ideal gas which incorporates quantum considerations which give aThermoeconomics (715 words) [view diff] no match in snippet view article find links to article

Thermoeconomists argue that economic systems always involve matter, energy, entropy, and information. Moreover, the aim of many economic activities is to achieveLaws of thermodynamics (2,546 words) [view diff] no match in snippet view article find links to article

thermodynamics define fundamental physical quantities (temperature, energy, and entropy) that characterize thermodynamic systems. The laws describe how these quantitiesNat (unit) (284 words) [view diff] no match in snippet view article find links to article

(symbol nat), sometimes also nit or nepit, is a unit of information or entropy, based on natural logarithms and powers of e, rather than the powers ofPoisson binomial distribution (524 words) [view diff] no match in snippet view article find links to article

no simple formula for the entropy of a Poisson binomial distribution, but the entropy can be upper bounded by that entropy of a binomial distributionSecond law of thermodynamics (9,021 words) [view diff] no match in snippet view article find links to article

natural thermodynamic process, there is an increase in the sum of the entropies of the participating systems. The second law is an empirical finding thatWehrl entropy (329 words) [view diff] no match in snippet view article find links to article

In quantum information theory, the Wehrl entropy, named after A. Wehrl, is a type of quasi-entropy defined for the Husimi Q representation Q(x,p) ofEntropy maximization (59 words) [view diff] no match in snippet view article find links to article

An entropy maximization problem is a convex optimization problem of the form maximize subject to where is the optimization variable, and are problemGibbs paradox (3,546 words) [view diff] no match in snippet view article find links to article

derivation of the entropy that does not take into account the indistinguishability of particles, yields an expression for the entropy which is not extensiveCatherine (metalcore band) (311 words) [view diff] no match in snippet view article find links to article

of Release Title Label 2004 Untitled demo Self Released 2005 A Call To Entropy Self-released 2006 Rumor Has It: Astaroth Has Stolen Your Eyes Rise RecordsParadigm in Entropy (83 words) [view diff] no match in snippet view article find links to article

Paradigm in Entropy is the debut album by the California based metal music group Bleed the Sky. The album was released on April 19, 2005 through NuclearMaximum entropy thermodynamics (3,465 words) [view diff] no match in snippet view article find links to article

In physics, maximum entropy thermodynamics (colloquially, MaxEnt thermodynamics) views equilibrium thermodynamics and statistical mechanics as inferenceEntropy of activation (119 words) [view diff] no match in snippet view article find links to article

The entropy of activation is one of the two parameters typically obtained from the temperature dependence of a reaction rate, when these data are analysedKullback–Leibler divergence (4,386 words) [view diff] no match in snippet view article find links to article

Kullback–Leibler divergence (also information divergence, information gain, relative entropy, or KLIC; here abbreviated as KL divergence) is a non-symmetric measureEntropy estimation (1,009 words) [view diff] no match in snippet view article find links to article

learning, and time delay estimation it is useful to estimate the differential entropy of a system or process, given some observations. The simplest and mostBekenstein bound (1,957 words) [view diff] no match in snippet view article find links to article

In physics, the Bekenstein bound is an upper limit on the entropy S, or information I, that can be contained within a given finite region of space whichQ-Gaussian distribution (856 words) [view diff] no match in snippet view article find links to article

Gaussian in the same way that Tsallis entropy is a generalization of standard Boltzmann–Gibbs entropy or Shannon entropy. The normal distribution is recoveredUncertainty coefficient (445 words) [view diff] no match in snippet view article find links to article

In statistics, the uncertainty coefficient, also called proficiency, entropy coefficient or Theil's U, is a measure of nominal association. It was firstFundamental thermodynamic relation (969 words) [view diff] no match in snippet view article find links to article

infinitesimal change in internal energy in terms of infinitesimal changes in entropy, and volume for a closed system in thermal equilibrium in the followingResidual entropy (571 words) [view diff] no match in snippet view article find links to article

Residual entropy is the difference in entropy between a non-equilibrium state and crystal state of a substance close to absolute zero. This term is usedMinimal-entropy martingale measure (159 words) [view diff] no match in snippet view article find links to article

probability theory, the minimal-entropy martingale measure (MEMM) is the risk-neutral probability measure that minimises the entropy difference between the objectiveIdeal gas (2,324 words) [view diff] no match in snippet view article find links to article

the entropy is an exact differential, using the chain rule, the change in entropy when going from a reference state 0 to some other state with entropy SDissipation (740 words) [view diff] no match in snippet view article find links to article

an isolated system. These processes produce entropy (see entropy production) at a certain rate. The entropy production rate times ambient temperature givesCryptographically secure pseudorandom number generator (2,127 words) [view diff] no match in snippet view article find links to article

comes from a true random source with high entropy. Ideally, the generation of random numbers in CSPRNGs uses entropy obtained from a high-quality source, whichHolographic principle (3,444 words) [view diff] no match in snippet view article find links to article

inspired by black hole thermodynamics, which conjectures that the maximal entropy in any region scales with the radius squared, and not cubed as might beEntropy (anonymous data store) (214 words) [view diff] no match in snippet view article find links to article

Entropy was a decentralized, peer-to-peer communication network designed to be resistant to censorship, much like Freenet. Entropy was an anonymous dataDiversity index (2,337 words) [view diff] no match in snippet view article find links to article

Shannon–Weaver index and the Shannon entropy. The measure was originally proposed by Claude Shannon to quantify the entropy (uncertainty or information content)Social entropy (531 words) [view diff] no match in snippet view article find links to article

Social entropy is a macrosociological systems theory. It is a measure of the natural decay within a social system. It can refer to the decomposition ofPassword strength (5,121 words) [view diff] no match in snippet view article find links to article

scheme to roughly estimate the entropy of human-generated passwords: The entropy of the first character is four bits; The entropy of the next seven charactersWrapped Cauchy distribution (518 words) [view diff] no match in snippet view article find links to article

expressions into the entropy integral, exchanging the order of integration and summation, and using the orthogonality of the cosines, the entropy may be written:Dudley's theorem (226 words) [view diff] no match in snippet view article find links to article

expected upper bound and regularity properties of a Gaussian process to its entropy and covariance structure. The result was proved in a landmark 1967 paperMolecular binding (620 words) [view diff] no match in snippet view article find links to article

be primarily entropy-driven (release of ordered solvent molecules around the isolated molecule that results in a net increase of entropy of the system)Self-information (747 words) [view diff] no match in snippet view article find links to article

calculation. The term self-information is also sometimes used as a synonym of entropy, i.e. the expected value of self-information in the first sense, becauseBraunstein-Ghosh-Severini Entropy (132 words) [view diff] no match in snippet view article find links to article

network theory, the Braunstein-Ghosh-Severini entropy (BGS entropy) of a network is the von Neumann entropy of a density matrix given by a normalized LaplacianPaul Erlich (301 words) [view diff] no match in snippet view article find links to article

Science degree in physics from Yale University. His invention of harmonic entropy has received significant attention from music theorists such as WilliamEntropy: A New World View (257 words) [view diff] no match in snippet view article find links to article

Entropy: A New World View is a non-fiction book by Jeremy Rifkin and Ted Howard, with an Afterword by Nicholas Georgescu-Roegen. First published by TheGeneralized entropy index (176 words) [view diff] no match in snippet view article find links to article

The generalized entropy index is a general formula for measuring redundancy in data. The redundancy can be viewed as inequality, lack of diversity, non-randomnessMin entropy (926 words) [view diff] no match in snippet view article find links to article

The min entropy, in information theory, is the smallest of the Rényi family of entropies, corresponding to the most conservative way of measuring the unpredictabilityInformation diagram (150 words) [view diff] no match in snippet view article find links to article

relationships among Shannon's basic measures of information: entropy, joint entropy, conditional entropy and mutual information. Information diagrams are a usefulIrreversible process (1,738 words) [view diff] no match in snippet view article find links to article

irreversible process increases the entropy of the universe. However, because entropy is a state function, the change in entropy of a system is the same whetherThermodynamics (13,287 words) [view diff] no match in snippet view article find links to article

energy and work. It defines macroscopic variables, such as internal energy, entropy, and pressure, that partly describe a body of matter or radiation. It statesTsallis distribution (238 words) [view diff] no match in snippet view article find links to article

probability distribution derived from the maximization of the Tsallis entropy under appropriate constraints. There are several different families ofNegative temperature (2,257 words) [view diff] no match in snippet view article find links to article

through its more rigorous definition as the tradeoff between energy and entropy, with the reciprocal of the temperature, thermodynamic beta, as the moreCarnot cycle (2,099 words) [view diff] no match in snippet view article find links to article

of heat energy Q2 and of entropy to flow out of the gas to the low temperature reservoir. (This is the same amount of entropy absorbed in step 1, as canLoschmidt's paradox (1,451 words) [view diff] no match in snippet view article find links to article

which was an attempt to explain using kinetic theory the increase of entropy in an ideal gas from a non-equilibrium state, when the molecules of theFree expansion (281 words) [view diff] no match in snippet view article find links to article

or enters the piston. Nevertheless, there is an entropy change, and the well-known formula for entropy change, does not apply because the process is notEntropy production (2,405 words) [view diff] no match in snippet view article find links to article

Entropy production determines the performance of thermal machines such as power plants, heat engines, refrigerators, heat pumps, and air conditionersTheil index (1,002 words) [view diff] no match in snippet view article find links to article

which is the maximum possible entropy of the data minus the observed entropy. It is a special case of the generalized entropy index. It can be viewed asHartley function (421 words) [view diff] no match in snippet view article find links to article

also known as the Hartley entropy. The Hartley function coincides with the Shannon entropy (as well as with the Rényi entropies of all orders) in the caseGibbs free energy (3,133 words) [view diff] no match in snippet view article find links to article

reaction going on in the universe. Thus the entropy released or absorbed by the system is actually the entropy that the environment must absorb or releaseEntropy exchange (70 words) [view diff] no match in snippet view article find links to article

processing, the entropy exchange of a quantum operation acting on the density matrix of a system is defined as where is the von Neumann entropy of the systemSpontaneous process (900 words) [view diff] no match in snippet view article find links to article

source of energy. The term is used to refer to macro processes in which entropy increases; such as a smell diffusing in a room, ice melting in lukewarmClausius theorem (861 words) [view diff] no match in snippet view article find links to article

flow in a system and the entropy of the system and its surroundings. Clausius developed this in his efforts to explain entropy and define it quantitativelyApproximate entropy (1,103 words) [view diff] no match in snippet view article find links to article

In statistics, an approximate entropy (ApEn) is a technique used to quantify the amount of regularity and the unpredictability of fluctuations over time-seriesRecurrence period density entropy (580 words) [view diff] no match in snippet view article find links to article

Recurrence period density entropy (RPDE) is a method, in the fields of dynamical systems, stochastic processes, and time series analysis, for determiningEntropy of mixing (3,796 words) [view diff] no match in snippet view article find links to article

In thermodynamics the entropy of mixing is the increase in the total entropy when several initially separate systems of different composition, each inEntropy (video game) (214 words) [view diff] no match in snippet view article find links to article

Entropy is a space MMORPG video game developed by the Norwegian game studio Artplant. The company is known for creating the MMORPG Battlestar GalacticaFrank L. Lambert (1,315 words) [view diff] no match in snippet view article find links to article

the definition of thermodynamic entropy as "disorder" in US general chemistry texts to its replacement by viewing entropy as a measure of energy dispersalAlgorithmic cooling (277 words) [view diff] no match in snippet view article find links to article

which the processing of certain types of computation results in negative entropy and thus a cooling effect. The phenomenon is a result of the connectionEndothermic process (334 words) [view diff] no match in snippet view article find links to article

analysis of a reaction is the Gibbs free energy (∆G), which includes an entropy (∆S) and temperature term in addition to the enthalpy. A reaction couldPhilosophy of thermal and statistical physics (1,196 words) [view diff] no match in snippet view article find links to article

mechanics, and related theories. Its central questions include: What is entropy, and what does the second law of thermodynamics say about it? Does eitherConjugate variables (thermodynamics) (1,385 words) [view diff] no match in snippet view article find links to article

expressed in terms of pairs of conjugate variables such as temperature and entropy or pressure and volume. In fact, all thermodynamic potentials are expressedFluctuation theorem (2,603 words) [view diff] no match in snippet view article find links to article

relative probability that the entropy of a system which is currently away from thermodynamic equilibrium (i.e., maximum entropy) will increase or decreaseEntropic uncertainty (1,263 words) [view diff] no match in snippet view article find links to article

Fourier analysis, the entropic uncertainty or Hirschman uncertainty is defined as the sum of the temporal and spectral Shannon entropies. It turns out thatExtremal black hole (295 words) [view diff] no match in snippet view article find links to article

radiation. Their black hole entropy can be calculated in string theory. It has been suggested by Sean Carroll that the entropy of an extremal black holeH-theorem (2,749 words) [view diff] no match in snippet view article find links to article

nearly-ideal gas of molecules. As this quantity H was meant to represent the entropy of thermodynamics, the H-theorem was an early demonstration of the powerThermochemistry (616 words) [view diff] no match in snippet view article find links to article

quantities throughout the course of a given reaction. In combination with entropy determinations, it is also used to predict whether a reaction is spontaneousEquilibrium thermodynamics (395 words) [view diff] no match in snippet view article find links to article

a minimum of its components' Gibbs free energy and a maximum of their entropy. Equilibrium thermodynamics differs from non-equilibrium thermodynamicsCircular uniform distribution (411 words) [view diff] no match in snippet view article find links to article

differential information entropy of the uniform distribution is simply where is any interval of length . This is the maximum entropy any circular distributionClausius–Duhem inequality (399 words) [view diff] no match in snippet view article find links to article

surface of the body, is the mass density of the body, is the specific entropy (entropy per unit mass), is the normal velocity of , is the velocity of particlesLimiting density of discrete points (376 words) [view diff] no match in snippet view article find links to article

for differential entropy. It was formulated by Edwin Thompson Jaynes to address defects in the initial definition of differential entropy. Shannon originallyIndex of information theory articles (89 words) [view diff] no match in snippet view article find links to article

Secrecy Systems conditional entropy conditional quantum entropy confusion and diffusion cross entropy data compression entropy encoding Fisher informationQuantities of information (580 words) [view diff] no match in snippet view article find links to article

logarithmic base in the following formulae determines the unit of information entropy that is used. The most common unit of information is the bit, based onMutual information (3,263 words) [view diff] no match in snippet view article find links to article

X) alone, namely the entropy of Y (or X). Moreover, this mutual information is the same as the entropy of X and as the entropy of Y. (A very specialQuasistatic process (311 words) [view diff] no match in snippet view article find links to article

irreversible, if there is heat flowing (in to or out of the system) or if entropy is being created in some other way. An example of a quasistatic processEnthalpy–entropy compensation (2,441 words) [view diff] no match in snippet view article find links to article

Enthalpy–entropy compensation is a specific example of the compensation effect. The compensation effect refers to the behavior of a series of closelyThermodynamic diagrams (581 words) [view diff] no match in snippet view article find links to article

consequences of manipulating this material. For instance, a temperature-entropy diagram (T-S diagram) may be used to demonstrate the behavior of a fluidFortuna (PRNG) (748 words) [view diff] no match in snippet view article find links to article

unreliable) estimators of entropy. There are several "pools" of entropy; each entropy source distributes its alleged entropy evenly over the pools; andMeasuring instrument (3,578 words) [view diff] no match in snippet view article find links to article

multipying the thermal potential by the amount of entropy found at that potential: temperature times entropy. Entropy can be created by friction but not annihilatedMinkowski–Bouligand dimension (1,197 words) [view diff] no match in snippet view article find links to article

and lower box dimension. The upper box dimension is sometimes called the entropy dimension, Kolmogorov dimension, Kolmogorov capacity, limit capacity orEntropic explosion (362 words) [view diff] no match in snippet view article find links to article

An entropic explosion is an explosion in which the reactants undergo a large change in volume without releasing a large amount of heat. The chemical decompositionSabayon Linux (2,136 words) [view diff] no match in snippet view article find links to article

cycle, its own software repository and a package management system called Entropy. Sabayon is available in both x86 and AMD64 distributions and there isLandauer's principle (1,063 words) [view diff] no match in snippet view article find links to article

merging of two computation paths, must be accompanied by a corresponding entropy increase in non-information bearing degrees of freedom of the informationTrouton's rule (464 words) [view diff] no match in snippet view article find links to article

the entropy of vaporization is almost the same value, about 85–88 J K−1 mol−1, for various kinds of liquids at their boiling points. The entropy of vaporizationRedundancy (information theory) (554 words) [view diff] no match in snippet view article find links to article

a source of information is the average entropy per symbol. For memoryless sources, this is merely the entropy of each symbol, while, in the most generalMaxwell's demon (3,215 words) [view diff] no match in snippet view article find links to article

to gradually heat up while the other side cools down, thus decreasing entropy. The thought experiment first appeared in a letter Maxwell wrote to PeterTable of thermodynamic equations (411 words) [view diff] no match in snippet view article find links to article

articles: List of thermodynamic properties, Thermodynamic potential, Free entropy, Defining equation (physical chemistry) Many of the definitions below areMonster (physics) (168 words) [view diff] no match in snippet view article find links to article

has maximum disorder. The high-entropy state of monsters has been theorized as being responsible for the high entropy of black holes; while the likelihoodGold universe (257 words) [view diff] no match in snippet view article find links to article

Universe starts with a Big Bang and expands for some time, with increasing entropy and a thermodynamic arrow of time pointing in the direction of the expansionEntropy (Hip Hop Reconstruction from the Ground Up) (390 words) [view diff] no match in snippet view article find links to article

Entropy (Hip Hop Reconstruction from the Ground up), is a B-side of 12" vinyl record that coupling of Asia Born and DJ Shadow and the Groove Rubbers.Bridgman's thermodynamic equations (351 words) [view diff] no match in snippet view article find links to article

relationships). The extensive variables of the system are fundamental. Only the entropy S , the volume V and the four most common thermodynamic potentials willMaterial properties (thermodynamics) (219 words) [view diff] no match in snippet view article find links to article

expansion where P is pressure, V is volume, T is temperature, S is entropy, and N is the number of particles. For a single component system, onlyID3 algorithm (879 words) [view diff] no match in snippet view article find links to article

and calculates the entropy (or information gain ) of that attribute. It then selects the attribute which has the smallest entropy (or largest informationWrapped normal distribution (609 words) [view diff] no match in snippet view article find links to article

e−σ2, and ln(1/Re2) will be a (biased) estimator of σ2 The information entropy of the wrapped normal distribution is defined as: where is any intervalThermodynamic process (1,390 words) [view diff] no match in snippet view article find links to article

thermal insulator. If a system has an entropy which has not yet reached its maximum equilibrium value, the entropy will increase even though the systemState function (714 words) [view diff] no match in snippet view article find links to article

equilibrium state of a system. For example, internal energy, enthalpy, and entropy are state quantities because they describe quantitatively an equilibriumGibbs algorithm (184 words) [view diff] no match in snippet view article find links to article

principle of maximum entropy, and the MaxEnt view of thermodynamics. This general result of the Gibbs algorithm is then a maximum entropy probability distributionThermodynamic cycle (1,847 words) [view diff] no match in snippet view article find links to article

Decrease in pressure (P), Decrease in entropy (S), Decrease in temperature (T) 3→4: Isentropic Compression: Constant entropy (s), Increase in pressure (P), DecreaseImmirzi parameter (1,126 words) [view diff] no match in snippet view article find links to article

its value is currently fixed by matching the semiclassical black hole entropy, as calculated by Stephen Hawking, and the counting of microstates in loopReversible process (thermodynamics) (816 words) [view diff] no match in snippet view article find links to article

means of infinitesimal changes in some property of the system without entropy production (i.e. dissipation of energy). Due to these infinitesimal changesStrong Subadditivity of Quantum Entropy (1,987 words) [view diff] no match in snippet view article find links to article

of entropy (SSA) was long known and appreciated in classical probability theory and information theory. Its extension to quantum mechanical entropy (theHeat (7,542 words) [view diff] no match in snippet view article find links to article

flows from a hotter body to a colder one. It results in a net increase in entropy. The pathway can be direct, as in conduction and radiation, or indirectChi distribution (302 words) [view diff] no match in snippet view article find links to article

following relationships: Mean: Variance: Skewness: Kurtosis excess: The entropy is given by: where is the polygamma function. If then (chi-squaredGibbs' inequality (299 words) [view diff] no match in snippet view article find links to article

statement about the mathematical entropy of a discrete probability distribution. Several other bounds on the entropy of probability distributions areCatabiosis (148 words) [view diff] no match in snippet view article find links to article

their entropy as waste. However, basic components of living systems—DNA, proteins, lipids and sugars—tend towards the state of maximum entropy while continuouslyVon Mises distribution (1,090 words) [view diff] no match in snippet view article find links to article

with a preferred orientation. The von Mises distribution is the maximum entropy distribution for a given expectation value of . The von Mises distributionDifferential pulse-code modulation (361 words) [view diff] no match in snippet view article find links to article

of 2 to 4 can be achieved if differences are subsequently entropy coded, because the entropy of the difference signal is much smaller than that of theOnsager reciprocal relations (1,433 words) [view diff] no match in snippet view article find links to article

may be solved for the entropy density: The above expression of the first law in terms of entropy change defines the entropic conjugate variables ofHigh entropy alloys (828 words) [view diff] no match in snippet view article find links to article

High-entropy alloys (HEAs) are substances that are constructed with equivalent quantities of five or more metals. Research indicates that HEAs are alsoThermodynamic free energy (2,683 words) [view diff] no match in snippet view article find links to article

that cannot be used to perform work. This unusable energy is given by the entropy of a system multiplied by the temperature of the system. Like the internalThermodynamic databases for pure substances (3,130 words) [view diff] no match in snippet view article find links to article

thermodynamic properties for substances, the most important being enthalpy, entropy, and Gibbs free energy. Numerical values of these thermodynamic propertiesArrow of time (2,318 words) [view diff] no match in snippet view article find links to article

technical discussion and for information related to current research, see Entropy (arrow of time). The Arrow of Time, or Time's Arrow, is a conceptThe Demons of Red Lodge and Other Stories (240 words) [view diff] no match in snippet view article find links to article

which they accepted unsolicited amateur submissions. Rick Briggs's "The Entropy Composition" was chosen from about 1200 submissions. The Doctor - PeterCarnot heat engine (1,372 words) [view diff] no match in snippet view article find links to article

mathematically elaborated upon by Rudolf Clausius in 1857 from which the concept of entropy emerged. Every thermodynamic system exists in a particular state. A thermodynamicHard hexagon model (564 words) [view diff] no match in snippet view article find links to article

Bibcode:1988JPhA...21L.983J, doi:10.1088/0305-4470/21/20/005, ISSN 0305-4470, MR 966792 Weisstein, Eric W., "Hard Hexagon Entropy Constant", MathWorld.Transcritical cycle (59 words) [view diff] no match in snippet view article find links to article

equations Table of thermodynamic equations Potentials Free energy Free entropy Internal energy Enthalpy Helmholtz free energy Gibbs free energyLeanne Frahm (551 words) [view diff] no match in snippet view article find links to article

in The Patternmaker : Nine Science Fiction Stories (ed. Lucy Sussex) "Entropy" (1995) in Bonescribes: Year's Best Australian Horror: 1995 (ed. Bill CongrevePrinciple of minimum energy (1,598 words) [view diff] no match in snippet view article find links to article

states that for a closed system, with constant external parameters and entropy, the internal energy will decrease and approach a minimum value at equilibriumGround state (662 words) [view diff] no match in snippet view article find links to article

system at absolute zero temperature exists in its ground state; thus, its entropy is determined by the degeneracy of the ground state. Many systems, suchCoherent information (162 words) [view diff] no match in snippet view article find links to article

Coherent information is an entropy measure used in quantum information theory. It is a property of a quantum state ρ and a quantum channel ; intuitivelyLarge deviations theory (1,575 words) [view diff] no match in snippet view article find links to article

with relating entropy with rate function). Main article: asymptotic equipartition property The rate function is related to the entropy in statisticalHigh-efficiency hybrid cycle (93 words) [view diff] no match in snippet view article find links to article

equations Table of thermodynamic equations Potentials Free energy Free entropy Internal energy Enthalpy Helmholtz free energy Gibbs free energyHalf-normal distribution (357 words) [view diff] no match in snippet view article find links to article

parameter of the new distribution. The entropy of the half-normal distribution is exactly one bit less the entropy of a zero-mean normal distribution with