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This paper proves the global boundedness in time of higher moments to a weak solution of the non-linear space-homogeneous
Boltzmann equation for inverse kth-power forces with k ≧ 5. In the course of the proof a new collisional estimate of
is obtained, where v, v* are the velocities before and v′, v′* are the velocities after a binary collision. 相似文献
24.
Conservation laws derived from the energy–momentum tensor are employed to establish under suitable sufficient conditions uniqueness
in affine boundary value problems for the homogeneous nonlinear elastic dielectric on the whole space and on certain cone-like
regions. In particular, the electric enthalpy is assumed to be strictly quasi-convex for the whole space, and strictly rank-one
convex for cone-like regions. Asymptotic behaviour is also stipulated. Uniqueness results for corresponding affine boundary
value problems of homogeneous nonlinear elastostatics are a special case of those derived here. 相似文献
25.
We consider a trapezoidal thin plate, as shown in Figure 1, which has one end loaded by a concentrated transverse unit force
and the other clamped at zero displacement. The stress is determined according to a method proposed by Galerkin [1] which
involves the superposition of two plane elastic stress distributions. To access the accuracy of the method, the oblique sides
of the trapezium are allowed to become parallel so that, in the limit, the trapezium becomes a rectangle of the same area.
The limiting values of the maximum stress components are exactly those obtained by the Saint-Venant method for a bar. However,
over the clamped end, the displacement vanishes only at three arbitrarily selected points. A similar procedure is applied
to the transversely loaded truncated cone, but now the limiting values of the stress do not entirely match those obtained
by the Saint-Venant theory for a circular cylinder. We also briefly discuss, for completeness, the same bodies under axial
loadings, and arrive at similar conclusions which therefore hold for general loads.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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The concept of partial weak clustering in the mean is defined for states on physical systems which admit amenable (semi-)groups of symmetries. The properties of partial weak clustering states are studied and the relations between these states and (extremal) invariant (partial) states are considered. As an application we discuss the zero field magnetization in the two-dimensional Ising model. 相似文献
29.
Michael Hayes Robin J. Knops 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1966,17(5):636-639
Zusammenfassung Es wird eine Methode zur Erhaltung allgemeingültiger Beziehungen für Verzerrungen kompressibler, isotroper, elastischer Körper dargestellt. 相似文献
30.
H.J.F Knops 《Annals of Physics》1980,128(2):448-462
A generalized version of the Villain model is defined which contains the eight-vertex model as a special case. A renormalization pattern is formulated in terms of this Villain model by which critical line(s) in the eight-vertex model are connected with the Gaussian fixed line. Gaussian equivalents are found for various operators along the Baxter line. The relation between the present results and those recently obtained by Kadanoff and Brown is discussed. 相似文献