共查询到20条相似文献,搜索用时 15 毫秒
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Peter Voinovich 《Journal of sound and vibration》2010,329(3):366-367
A widespread error related to Poisson's ratio and its limiting value 0.5 provokes complex explanations of fully coherent experimental data. 相似文献
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J.E. Lorenzo H. Requardt 《The European Physical Journal B - Condensed Matter and Complex Systems》2002,28(2):185-186
Eur. Phys. J. B 24, 315 (2001) Here we comment on a recently published paper on the presence of a phason contribution in the low temperature heat capacity data of the charge-density-wave compounds K0.3MoO3 and (TaSe4)2I. We have shown that the anomaly in the C
P
/
T
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data reported by Odin et al. is straightforwardly interpreted in terms of low energy phonon modes resulting from the peculiar topology of these compounds.
Received 21 February 2002 Published online 19 July 2002 相似文献
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An experimental study of self-excited ion acoustic waves with wavelengths greater than the radius of the discharge tube in a de-low pressure column is presented. The propagation of this type of waves was observed over a pressure range of 5 · 10?4 torr ≦ p ≦ 10?1 torr and currents of 0,02 A ≦ i ≦ 0,6 A in various gases (argon, neon, helium, and hydrogen) in cylindrical glass tubes with diameters of d = 2;4 and 6 cm. The Dispersion behaviour and the existence range were measured in dependence of the internal parameters of the discharge (characteristic velocities and collision frequencies) and the geometry of the discharge tube. It is shown, that the existence range depends not only on gas pressure and current but is influenced also by the geometry of the discharge tube. The minimum wavelengths which belong to the upper cut-off frequencies correlate with the radius of the discharge tube at currents higher than i ~ 0,2 A and increasing pressure. 相似文献
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Hossenfelder proposes in [S. Hossenfelder, Phys. Lett. B 636 (2006) 119] and [S. Hossenfelder, gr-qc/0605083] a symmetry between gravitating and anti-gravitating particles by superposing a negative charge to classical relativity. This Letter explicitly shows that the latter proposal does not address any of the difficulties that arise in such context. On the contrary, the “world-lines” of the anti-gravitating particles are defined as observer-dependent entities and no attempt whatsoever to dynamically restore local boost invariance is made. Both papers simply focus on the erroneous construction of a new bundle attached to a preferred timelike vector field, although the author gives the impression that no such preference is needed. 相似文献
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We obtain a family of polynomials defined by vanishing conditions and associated to tangles. We study more specifically the
case where they are related to a O(n) loop model. We conjecture that their specializations at z
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= 1 are positive in n. At n = 1, they coincide with the Razumov-Stroganov integers counting alternating sign matrices.
We derive the CFT modular invariant partition functions labelled by Coxeter-Dynkin diagrams using the representation theory
of the affine Hecke algebras. 相似文献
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David Ruelle 《Communications in Mathematical Physics》2009,287(3):1039-1070
By using a suitable Banach space on which we let the transfer operator act, we make a detailed study of the ergodic theory
of a unimodal map f of the interval in the Misiurewicz case. We show in particular that the absolutely continuous invariant measure ρ can be
written as the sum of 1/square root spikes along the critical orbit, plus a continuous background. We conclude by a discussion
of the sense in which the map may be differentiable. 相似文献