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排序方式: 共有139条查询结果,搜索用时 15 毫秒
1.
E. Dror Farjoun 《Israel Journal of Mathematics》1989,66(1-3):132-142
Using a new group of singular chains on polyhedra, a transfer map is defined on the chain level for fibrations with singularities.
These include usual transfer on homology as well as Oliver transfer and other cases. 相似文献
2.
Dror Weitz 《Random Structures and Algorithms》2005,27(4):445-475
We generalize previously known conditions for uniqueness of the Gibbs measure in statistical physics models by presenting conditions of any finite size for models on any underlying graph. We give two dual conditions, one requiring that the total influence on a site is small, and the other that the total influence of a site is small. Our proofs are combinatorial in nature and use tools from the analysis of discrete Markov chains, in particular the path coupling method. The implications of our conditions for the mixing time of natural Markov chains associated with the models are discussed as well. We also present some examples of models for which the conditions hold. © 2005 Wiley Periodicals, Inc. Random Struct. Alg., 2005 相似文献
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N. Croitoru J. Dror E. Goldenberg D. Mendlovic S. Ruschin 《Fiber and Integrated Optics》1987,6(4):347-361
The problem of transmission of CO2 laser radiation through hollow fibers and waveguides was studied theoretically and confirmed experimentally. The transmission of the laser radiation through metal and metal-dielectric tubes was measured and compared with the theoretical data based on a ray model solution. This makes possible the investigation of the transmission of the CO2 radiation through waveguides when the internal wall is covered with a metal or a metal- dielectric film. It was shown theoretically and proved experimentally that the transmission of the CO2 radiation is possible even through bent waveguides. 相似文献
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The paper examines the inventory routing problem from the perspective of the present value of the cash flow associated with the distribution of a commodity such as propane. We analyze this problem for both deterministic and stochastic customer demands and validate our results on data from a real life distribution operation of propane. The analysis based on the present value of the cash flow indicates that optimization of propane deliveries based on efficiency/cost criteria alone will generate inferior solutions and it would be more advantageous for the company to set deliveries for a large percentage of the customers based on the present value of cash flow. In addition, in the case of stochastic demands, deliveries based on the cash flow consideration will tend to reduce the number of stockouts (i.e. improve both profit and service). 相似文献
8.
N. Peyghambarian Dror Sarid H.M. Gibbs L.L. Chase A. Mysyrowicz 《Optics Communications》1984,49(2):125-128
It is shown that the cage model of the spectral broadening of the biexciton resonance in CuCl due to collisions is in agreement with experimental results. 相似文献
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We study the existence of solutions to the orthogonal dynamics equation, which arises in the Mori-Zwanzig formalism in irreversible
statistical mechanics. This equation generates the random noise associated with a reduction in the number of variables. IfL is the Liouvillian, or Lie derivative associated with a Hamiltonian system, andP an orthogonal projection onto a closed subspace ofL
2, then the orthogonal dynamics is generated by the operator (I −P)L. We prove the existence of classical solutions for the case whereP has finite-dimensional range. In the general case, we prove the existence of weak solutions. 相似文献