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Aircraft Profile No. 23: The Messerschmitt Bf 110 - download pdf or read online

By Martin C. Windrow

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Extra info for Aircraft Profile No. 23: The Messerschmitt Bf 110

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In the early stages of the development of the quantum electron theory of metals, it was assumed that, at absolute zero, electrons are condensed in a Fermi sphere on whose surface the energy is equal to the chemical potential (see Appendix C). Later theoretical and experimental investigations of the electron theory of metals [9] established that the condensation of electrons at T = 0 into a Fermi sphere is an exceptionally rare event. The Fermi surfaces in which electrons are condensed at T = 0 are considerably more complex than a sphere.

43) SEC. 4] PHENOMENOLOGICAL THEORY OF THE EQUATION OF STATE 41 in which the two numerical constants (Ae 01 , n1) or (Ae 02 , B1) are found from low-temperature and high-temperature experimental data, respectively. The factor x2/3 in Eq. 43) is shown separate for the sake of clarity. When n 1 = 0 or B1 = 0, Eqs. 19), yielding 'Ye = 2~. In general, Eqs. 43) give the following formulas for the electron analog of the Grüneisen parameter: 2 Yet=nt+3' 2 Bt ,, Yez=3+3z". 41b) The thermal pressure of the conduction electrons is Pre = - ( a:;.

21), so that N= Sv(e)n,(e)de. 1. to within T 2• At T = 0, the Fermi- Dirac distribution degenerates into the step shown in Fig. 1. becomes equal to the Fermi energy eF (see Appendix C): a, N = ~ v(e)de at T = 0. l. 23) 38 HIGH-TEMPERATURE CORRECTIONS TO EQUATION OF STATE [CHAP. J. can be easily determined using the general formula for the calculation of the Fermi integrals [Eq. 47)] and applying it to Eq. 2la): According to Eq. 23), we can divide both sides of the above equation by N. ' = r. - r.

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Aircraft Profile No. 23: The Messerschmitt Bf 110 by Martin C. Windrow


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