problem n. 1.问题,课题;疑难问题;令人困惑的情况。 2.【数、物】习题;作图题。 3.(象棋的)布局问题。 the problem of unemployment 失业问题。 His whole conduct is a problem to me. 他的一切行为我都不理解。 adj. 1.成问题的;难处理的。 2.关于社会问题的。 a problem child 【心理学】问题儿童;难管教的孩子。 a problem novel [play] (反映社会问题等的)问题小说[戏剧]。 sleep on [upon, over] a problem 把问题留到第二天解决。
We'll run into that problem time and again . 这个问题我们还会时不时地碰到。
One is multi - dimension maximum sum of relative membership degree ; the other is staged multi - dimensional fuzzy optimization method . the first method is suitable for the static program that time is not involved , and the second method can be used to solve any multistage problem , especially for those problems time is involved , in the end , these methods are explained in detail one by one 其中,多维多目标决策序列相对优属度总和最大法适于解决不涉及时间维的“静态”多阶段优化问题,而多维多目标阶段模糊优选动态规划方法不仅适用于“静态”问题,而且适用于“动态”的任一阶段或任一层次的优化问题。
In this paper , a crank - nicolson mixed element method , a nonlinear galerkin mixed element method for the non stationary conduction - convection problems time second order accuracy fully discrete formats and a two - level mixed element method with backtracing for the stationary conduction - convection problems are presented and analyed , respectively , an error analysis are provided for the crank - nicolson method of time discretization applied to spatially discrete galerkin mixed element approximations of the nonstationary conduction - convection problems 本文分别给出了非定常的热传导-对流问题的crank - nicolson混合元法时间二阶精度全离散格式,非线性galerkin混合元法时间二阶精度全离散格式以及定常的热传导-对流问题回溯二重水平法。讨论了时间上的crank - nicolson离散方法应用于非定常的热传导-对流问题的空间离散的galerkin混合元近似。
Under the assumptions of non - convexity and non - degeneration , it is proved that the solutions of the initial - boundary problem to this viscoelastic model tend towards the travelling wave solution of the corresponding cauchy problem time - asymptotically for zero boundary speed and small initial perturbation by a weighted energy method 对粘弹性模型,用权能量方法证明了在非凸非退化的情形下,当边界速度为0 ,初始值具有小扰动时,具初边值问题的解收敛于相应的柯西问题的行波解。