Disk encryption theory - Revision history

208.87.223.18: /* XEX-based tweaked-codebook mode with ciphertext stealing (XTS) */ add diagram showing XTS encryption

2014-09-17T23:38:07Z

XEX-based tweaked-codebook mode with ciphertext stealing (XTS): add diagram showing XTS encryption

← Older revision		Revision as of 01:38, 18 September 2014
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en>Hmains: revert vandalism

2014-02-05T04:35:55Z

revert vandalism

← Older revision		Revision as of 06:35, 5 February 2014
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	~~In [[nuclear physics]]~~, '''secular equilibrium''' is a situation in which the quantity of a [[radioactive]] [[isotope]] remains constant because its production rate (e.g., due to decay of a parent isotope) is equal to its decay rate.		Hi there, I am Alyson Pomerleau and I believe it seems fairly great when you say it. One of the things she loves most is canoeing and she's been performing it for fairly a whilst. Some time in the past she chose to live in Alaska and her parents reside close by. Credit authorising is where my primary earnings comes from.<br><br>My web site; online psychic - [http://165.132.39.93/xe/visitors/372912 Highly recommended Reading],

	~~==Secular equilibrium in radioactive decay==~~
	~~<!-- Image with unknown copyright status removed: [[Image:Secular Equilibrium.GIF]] -->~~
	~~Secular equilibrium can only occur in a radioactive decay chain if the [[half-life]]~~ of the ~~daughter radionuclide B~~ is ~~much shorter than the half-life of the parent radionuclide A. In such~~ a ~~situation, the decay rate of A, and hence the production rate of B, is approximately constant, because the half-life of A is very long compared to the timescales being considered~~. ~~The quantity of radionuclide B builds up until the number of B atoms decaying per unit~~ time ~~becomes equal to the number being produced per unit time; the quantity of radionuclide B then reaches a constant, ''equilibrium'' value. Assuming~~ the ~~initial concentration of radionuclide B is zero, full equilibrium usually takes several half-lives of radionuclide B~~ to ~~establish~~.

	~~The quantity of radionuclide B when secular equilibrium~~ is ~~reached is determined by the quantity of its parent A and the half-lives of the two radionuclide. This can be seen~~ from ~~the time rate of change of the number of atoms of radionuclide B:~~

	~~:<math>\frac{dN_B}{dt} = \lambda_A N_A - \lambda_B N_B</math> ,~~

	where λ<sub>A</sub> and λ<sub>B</sub> are the [[exponential decay\|decay constants]] of radionuclide A and B, related to their half-lives t<sub>1/2</sub> by <math>\lambda = ln(2)/t_{1/2}</math>, and N<sub>A</sub> and N<sub>B</sub> are the number of atoms of A and B at a given time.

	~~Secular equilibrium occurs when <math>dN_B/dt = 0</math>, or~~

	:<~~math~~>~~N_B = \frac{\lambda_A}{\lambda_B}N_A~~<~~/math~~> .

	~~Over long enough times, comparable to the half-life of radionuclide A, the secular equilibrium is only approximate~~; ~~N<sub>A</sub> decays away according to~~

	~~:<math>N_A(t) = N_A(0) e^{-\lambda_A t}</math> ,~~

	~~and the "equilibrium" quantity of radionuclide B declines in turn. For times short compared to the half~~-~~life of A, <math>\lambda_A t \ll 1</math> and the exponential can be approximated as 1.~~

	~~==See also==~~
	* [[Bateman Equation]]
	*[[Transient equilibrium]]

	~~==References==~~
	*[http://~~www~~.~~iupac~~.~~org/goldbook/S05532~~.~~pdf IUPAC definition]~~
	*[http://www.epa.gov/~~rpdweb00~~/~~understand~~/~~equilibrium.html EPA definition]~~

	~~{{physics-stub}}~~

	~~[[Category:Radioactivity]~~]

en>Hmains: /* Problem definition */copyedit, MOS value rules and AWB general fixes using AWB

2014-02-03T05:24:23Z

Problem definition: copyedit, MOS value rules and AWB general fixes using AWB

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en>HumphreyW: Reverted edits by 213.88.151.99 (talk) to last version by Nageh

2012-07-02T16:50:39Z

Reverted edits by 213.88.151.99 (talk) to last version by Nageh

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