翻訳と辞書 Words near each other ・ "O" Is for Outlaw ・ "O"-Jung.Ban.Hap. ・ "Ode-to-Napoleon" hexachord ・ "Oh Yeah!" Live ・ "Our Contemporary" regional art exhibition (Leningrad, 1975) ・ "P" Is for Peril ・ "Pimpernel" Smith ・ "Polish death camp" controversy ・ "Pro knigi" ("About books") ・ "Prosopa" Greek Television Awards ・ "Pussy Cats" Starring the Walkmen ・ "Q" Is for Quarry ・ "R" Is for Ricochet ・ "R" The King (2016 film) ・ "Rags" Ragland ・ ! (album) ・ ! (disambiguation) ・ !! ・ !!! ・ !!! (album) ・ !!Destroy-Oh-Boy!! ・ !Action Pact! ・ !Arriba! La Pachanga ・ !Hero ・ !Hero (album) ・ !Kung language ・ !Oka Tokat ・ !PAUS3 ・ !T.O.O.H.! ・ !Women Art Revolution Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク kinetic inductance ： ウィキペディア英語版 kinetic inductance Kinetic inductance is the manifestation of the inertial mass of mobile charge carriers in alternating electric fields as an equivalent series inductance. Kinetic inductance is observed in high carrier mobility conductors (e.g. superconductors) and at very high frequencies. == Explanation == A change in electromotive force (emf) will be opposed by the inertia of the charge carriers since, like all objects with mass, they prefer to be traveling at constant velocity and therefore it takes a finite time to accelerate the particle. This is similar to how a change in emf is opposed by the finite rate of change of magnetic flux in an inductor. The resulting phase lag in voltage is identical for both energy storage mechanisms, making them indistinguishable in a normal circuit. Kinetic inductance ($L\_$) arises naturally in the Drude model of electrical conduction when the relaxation time (collision time) $\backslash tau$ is taken to be non-zero. This model defines a complex conductivity in a time-varying electric field of frequency $\backslash omega$ given by $\}$. The imaginary part arises from kinetic inductance. The Drude complex conductivity can be expanded into its real and imaginary components: $\backslash sigma\; =\; \backslash frac\; =\; \backslash frac-i\backslash frac$ where $m$ is the mass of the charge carrier (i.e. the effective electron mass in metallic conductors) and $n$ is the carrier number density. In normal metals the collision time is typically $\backslash approx\; 10^$ s, so for frequencies < 100 GHz the term $$ is very small and can be ignored. Kinetic inductance is therefore only significant at optical frequencies and in superconductors, where $$. For a superconducting wire, the kinetic inductance can be calculated by equating the total kinetic energy of the Cooper pairs with an equivalent inductive energy:〔A.J. Annunziata ''et al.'', "Tunable superconducting nanoinductors," ''Nanotechnology'' 21, 445202 (2010), , 〕 $\backslash frac(2mv^2)(n\_lA)=\backslash fracL\_KI^2$ where $m$ is the electron mass ($2m$ is the mass of a Cooper pair), $v$ is the average Cooper pair velocity, $n\_$ is the density of Cooper pairs, $l$ is the length of the wire, $A$ is the wire cross-sectional area, and $I$ is the current. Using the fact that the current $I\; =\; 2evn\_A$, where $e$ is the electron charge, this yields: $L\_K=\backslash left(\backslash frac\backslash right)\backslash left(\backslash frac\backslash right)$ The same procedure can be used to calculate the kinetic inductance of a normal (i.e. non-superconducting) wire, except with $2m$ replaced by $m$, $2e$ replaced by $e$, and $n\_$ replaced by the normal carrier density $n$. This yields: $L\_K=\backslash left(\backslash frac\backslash right)\backslash left(\backslash frac\backslash right)$ The kinetic inductance increases as the carrier density decreases. Physically, this is because a smaller number of carriers must have a greater velocity than a larger number of carriers in order to achieve the same current. In a normal metal wire, the resistivity also increases as the carrier density $n$ decreases. As a result, in normal metals the resistive contribution to the impedance dominates the contribution from kinetic inductance up to frequencies ~ THz. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「kinetic inductance」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.