排序方式: 共有39条查询结果,搜索用时 46 毫秒
31.
考虑工件可自由下线最小化总完工时间的有界平行分批排序问题. 在该问题中, 一台平行批机器可以同时处理 b 个工件作为一个平行批, 这里b 是批容量, 一个批的加工时间等于分配给这个批的工件的最大加工时间. 关于可自由下线工件, 每一个工件的完工时间等于包含这个工件的批的开工时间与工件的加工时间的和. 也就是, 如果一个批B 有一个开工时间S, 那么包含在批B 中的每一个工件J_j 的开工时间定义为S, 而它的完工时间定义为S+p_j, 这里p_j 是工件J_j 的加工时间. 对此问题, 首先研究最优排序的一些性质. 然后, 基于这些性质, 给出一个运行时间为O(n^{b (b-1)})的动态规划算法. 相似文献
32.
The two-dimensional magneto-hydrodynamic (MHD) equations are considered in this article. Viscous approximations are used to obtain the local existence and uniqueness of the classical solution. When the viscous term vanishes, the convergence rates, a main problem in turbulence,are also discussed. Moreover, a blow-up criterion for our classical solution is established in terms of the magnetic fields. 相似文献
33.
In this article, we prove the local existence and uniqueness of the classical solution to the Cauchy problem of the 3-D compressible Navier-Stokes equations with large initial data and vacuum, if the shear viscosity μ is a positive constant and the bulk viscosity λ(ρ) = ρβwith β≥ 0. Note that the initial data can be arbitrarily large to contain vacuum states. 相似文献
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随着物流经济的快速发展,共享物流为提高仓储管理效率提供了新的途径.通过分析共享仓储中的云仓模式,针对云仓平台使用中的信用监管问题,构建了该模式下云仓平台、仓储供给方以及仓储需求方三方的演化博弈模型,运用演化博弈理论分析了各参与方策略选择的演化稳定性,并使用Matlab进行了数值仿真,分析不同参数变化对演化结果的影响.研... 相似文献
36.
In this paper the Cauchy problem for the following nonhomogeneous Burgers’ equation is considered : (1)u
t
+uu
x
=μu
xx
−kx,x ∈R,t > 0, where μ and k are positive constants. Since the nonhomogeneous term kx does not belong to any Lp(R) space, this type of equation is beyond usual Sobolev framework in some sense. By Hopf-Cole transformation, (1) takes the
form (2)ϕ
t
−ϕ
xx
= −x
2
ϕ. With the help of the Hermite polynomials and their properties, (1) and (2) are solved exactly. Moreover, the large time
behavior of the solutions is also considered, similar to the discussion in Hopf’s paper. Especially, we observe that the nonhomogeneous
Burgers’ equation (1) is nonlinearly unstable. 相似文献
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有关二维Euler方程的一些估计 总被引:6,自引:0,他引:6
首先得到Lorentz空间中的一些结果,然后在此基础上得到了有关二维Euler方程解的一些估计。这些估计与该方程当初始旋度ω0∈L^-1∩L^p(p〉1)时解的唯一性有关。 相似文献
39.
In this paper,we consider the weak solutions of compressible Navier-StokesLandau-Lifshitz-Maxwell(CNSLLM) system for quantum fluids with a linear density dependent viscosity in a 3D torus.By introducing the cold pressure Pc,we prove the global existence of weak solutions with the pressure P+Pc,where P=Aργ with γ≥1.Our main result extends the one in [13] on the quantum Navier-Stokes equations to the CNSLLM system. 相似文献