The decay assumption is part of many theories of short-term memory, the most notable one being Baddeley's model of working memory.

* In simple glottochronology, the ( debatable ) assumption of a constant decay rate in languages allows to estimate the age of single languages.

Note that such s ( t ) is uniformly continuous, this together with the decay assumption on s, show that the series defining s < sub > P </ sub > converges uniformly to a continuous function.

This is a well founded major assumption, common to all dating methods based on radioactive decay.

The card may be lost ; there may be time decay ( expiration and fees ) or complex rules of redemption ; the recipient may not be interested in the store that accepts the card or be under the false assumption that not using it will save money for the giver.

Riggs defended Tongues Untied for its ability to “ shatter this nation's brutalizing silence on matters of sexual and racial difference .” He explained that the widespread attack on PBS and the National Endowment for the Arts by moral critics in response to the film was predictable, since “ any public institution caught deviating from their puritanical morality is inexorably blasted as contributing to the nation's social decay .” In his defense, Riggs claimed that “ implicit in the much overworked rhetoric about ' community standards ' is the assumption of only one central community ( patriarchal, heterosexual and usually white ) and only one overarching cultural standard ( ditto ) to which television programming must necessarily appeal .” Riggs stated that ironically, the censorship campaign against Tongues Untied actually brought more publicity to the film than it would have otherwise received and thus allowed it to achieve its initial aim of challenging societal standards regarding depictions of race and sexuality.

In the case of social decay, form is displaced simply by the process of dissolution with no form at the terminus of the process.

Khrushchev, for all his bombastic prophecies about the inevitable decay of capitalism, is genuinely favorable to `` peaceful coexistence '' and would like, above all, the Berlin and German problems to be settled peacefully ; ;

Nearly all of this argon is radiogenic argon-40 derived from the decay of potassium-40 in the Earth's crust.

Where the major source of argon is the decay of

Six astatine isotopes, with mass numbers of 214 to 219, are present in nature as the products of various decay routes of heavier elements, but neither the most stable isotope of astatine ( with mass number 210 ) nor astatine-211 ( which is used in medicine ) is produced naturally.

Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle ( two protons and two neutrons ) and thereby transforms ( or ' decays ') into an atom with a mass number 4 less and atomic number 2 less.

Alpha decay is by far the most common form of cluster decay where the parent atom ejects a defined daughter collection of nucleons, leaving another defined product behind ( in nuclear fission, a number of different pairs of daughters of approximately equal size are formed ).

Alpha decay is the most likely cluster decay because of the combined extremely high binding energy and relatively small mass of the helium-4 product nucleus ( the alpha particle ).

Alpha decay, like other cluster decays, is fundamentally a quantum tunneling process.

Unlike beta decay, alpha decay is governed by the interplay between the nuclear force and the electromagnetic force.

Most of the helium produced on Earth ( approximately 99 % of it ) is the result of the alpha decay of underground deposits of minerals containing uranium or thorium.

Alpha decay is much more easily shielded against than other forms of radioactive decay.

For example, the antiparticle of the electron is the positively charged antielectron, or positron, which is produced naturally in certain types of radioactive decay.

Because charge is conserved, it is not possible to create an antiparticle without either destroying a particle of the same charge ( as in beta decay ) or creating a particle of the opposite charge.

This reaction was studied for the first time in 2008 by the team at RIKEN, Japan, in order to study the decay properties of < sup > 266 </ sup > Bh, which is a decay product in their claimed decay chains of ununtrium .< ref > The decay of < sup > 266 </ sup > Bh by the emission of 9. 05-9. 23 MeV alpha particles was further confirmed in 2010.

This occurs because excited molecules usually decay to the lowest vibrational level of the excited state before fluorescence emission takes place.

Helium is typically separated from natural gas, and radon is usually isolated from the radioactive decay of dissolved radium compounds.

Fission products have, on average, about the same ratio of neutrons and protons as their parent nucleus, and are therefore usually unstable to beta decay ( which changes neutrons to protons ) because they have proportionally too many neutrons compared to stable isotopes of similar mass.

Nuclear energy usually means the part of the energy of an atomic nucleus, which can be released by fusion or fission or radioactive decay.

However, as already mentioned in the original paper of Franz Wegner, a solid state theorist who introduced 1971 simple gauge invariant lattice models, the high-temperature behaviour of the original model, e. g. the strong decay of correlations at large distances, corresponds to the low-temperature behaviour of the ( usually ordered!

Radiometric dating ( often called radioactive dating ) is a technique used to date materials such as rocks, usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.

This transformation may be accomplished in a number of different ways, including radioactive decay, either by emission of particles ( usually electrons ( beta decay ), positrons or alpha particles ) or by spontaneous fission, and electron capture.

It is not necessarily surprising that there is only one such discovery, because a crucified body was usually left to decay on the cross and therefore would not be preserved.

In electronics, fall time ( pulse decay time ) is the time required for the amplitude of a pulse to decrease ( fall ) from a specified value ( usually 90 percent of the peak value exclusive of overshoot or undershoot ) to another specified value ( usually 10 percent of the maximum value exclusive of overshoot or undershoot ).

In the Barotse Floodplain of the Zambezi River, the first floodwaters of the rainy season are usually hypoxic because of material such as cattle manure and previous decay of vegetation which grew during the dry season.

These are usually seen as a thunderstorm passes over the observer or begins to decay.

For this, a phosphor coating is applied to a surface of interest and, usually, the decay time is the emission parameter that indicates temperature.

Reverberation time is usually stated as a decay time and is measured in seconds.

* Much of the so-called near-field of radio antennas, where the magnetic and electric effects of the changing current in the antenna wire and the charge effects of the wire's capacitive charge may be ( and usually are ) important contributors to the total EM field close to the source, but both of which effects are dipole effects that decay with increasing distance from the antenna much more quickly than do the influence of " conventional " electromagnetic waves that are " far " from the source.

This decay happens when a large unstable nucleus spontaneously splits into two ( and occasionally three ) smaller daughter nuclei, and usually emits gamma rays, neutrons, or other particles as a consequence.

Slums are usually characterized by urban decay, high rates of poverty, illiteracy and unemployment or lack of personal / community land ownership.

The female usually lays between September and February, provided there has been enough rain to start organic decay of the litter.

The structural image is usually of a higher resolution and depends on a different signal, the T1 magnetic field decay after excitation.

A much longer decay time is usually employed, so that the gain does not get boosted too quickly during the normal pauses in natural speech.

Coupling is usually accomplished by placing two or more electromagnetic elements such as optical waveguides close together so that the evanescent field generated by one element does not decay much before it reaches the other element.

These are made-up ; the Saprolegnia " fur " cannot be preserved by taxidermy, and heavily overgrown fish are usually found only after they have already started to decay.