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排序方式: 共有286条查询结果,搜索用时 15 毫秒
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Patricio V Poblete J.Ian Munro 《Journal of Algorithms in Cognition, Informatics and Logic》1985,6(3):336-350
A detailed analysis is presented for the behaviour of binary search trees built by using a heuristic that performs only local reorganizations at the bottom of the tree. 相似文献
24.
In this paper we study the direct decomposability of free Tarski algebras. We
show that infinite freely generated Tarski algebras are directly indecomposable, whereas
finite freely generated Tarski algebras can only be decomposed into a direct product of two
factors, one of which is the two-element Tarski algebra. 相似文献
25.
In the context of a complete simply connected Riemannian manifold of pinched negative curvature, we show that several families
of approach domains are equivalent for convergence to points of the boundary, and for the purposes of Hp-theory. 相似文献
26.
We study the stability of general relativistic static thick disks. As an application we consider the thick disk generated
by applying the “displace, cut, fill and reflect” method, usually known as the image method, to the Schwarzschild metric in
isotropic coordinates. The isotropic Schwarzschild thick disk obtained from this method is the simplest model to describe,
in the context of General Relativity, real thick galaxies. Stability under a general first order perturbation of the disk
energy momentum tensor is investigated. The first order perturbation, when applied to the conservation equations, leads to
a set of differential equations that have fewer equations than unknowns. In this article we search for perturbations in which
the perturbation of the four velocity in a certain direction leads to a pressure perturbation in the same direction. We found
that, in general, the isotropic Schwarzschild thick disk is stable under these kinds of perturbations. 相似文献
27.
Balance equations are derived from Enskog’s kinetic equation for a two-dimensional system of hard disks using Grad’s moment
expansion method. This set of equations constitute an extended hydrodynamics for moderately dense bi-dimensional fluids. The
set of independent hydrodynamic fields in the present formulations are: density, velocity, temperature and also—following Grad’s original idea—the symmetric and traceless pressure tensor p
ij
and the heat flux vector q
k
. An approximation scheme similar in spirit to one made by Grad in his original work is made. Once the hydrodynamics is derived
it is used to discuss the nature of a simple one-dimensional heat conduction problem. It is shown that, not too far from equilibrium,
the nonequilibrium pressure in this case only depends on the density, temperature and heat flux vector.
PACS: 51.10.+y, 05.20.Jj, 44.10.+i, 05.70.Ln 相似文献
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29.
Patricio Jara 《Journal of Mathematical Analysis and Applications》2008,344(2):956-968
This paper extends the Hille-Phillips functional calculus and rational approximations results due to R. Hersh, T. Kato, P. Brenner, and V. Thomée to generators of bi-continuous semigroups. The method yields error estimates for rational time-discretization schemes for such semigroups, in particular for dual semigroups, Feller semigroups such as the Ornstein-Uhlenbeck semigroup, the heat semigroup, semigroups induced by nonlinear flows, implemented semigroups, and evolution semigroups. Furthermore, the results provide error estimates for a new class of inversion formulas for the Laplace transform. 相似文献
30.
We introduce the notion ofsearchability as a property of an in place merging algorithm. We show that a pair of sorted arrays can be merged in place in linear time, so that a search can be performed in logarithmic time at any point during the merging process. We apply this method to devise an implicit data structure which can support searches inO(log2
n) time in the worst case, andO(logn) on the average, and insertions inO(logn) time, in the worst case.This research was partly supported by NSERC under grant A8237 and presented in preliminary form at the 10th International Colloquium on Automata, Languages and Programming.On leave from the University of Chile. 相似文献