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1.
加强实践环节研究 促进信息与计算科学专业建设   总被引:20,自引:1,他引:19  
结合信息与计算科学专业的特点和现状,分析了实践环节教学中存在的问题,并对实践环节教学模式进行了研究.  相似文献
2.
锥形血管入口区域内管壁与血液的耦合运动   总被引:6,自引:0,他引:6  
本文研究了锥形血管入口区域内血管壁与血液间的耦合问题。对具有锥度角的弹性血管入口区域内的管壁运动和血液流动建立的相互耦合作用的数学模型,在满足相应的边界条件下求得了一组血液流动的速度分布公式、压力分布公式以及管壁运动公式,得出了一些重要的结论。  相似文献
3.
锥形血管入口区域内管壁应力分析   总被引:1,自引:0,他引:1  
本文对锥形血管入口区域的流动进行了探讨,导出了压力分布、轴向和径向的速度分布以及流场的切应力分布、管壁应力分布等公式,进行了相应的数值算例的研究和分析,还着重讨论了血管锥度角对管壁应力、压力分布等的影响。  相似文献
4.
Suppose that is admissible. It is shown that the convex hull of unitary elements of a weakly closed -module contains the whole unit ball of if and only if and for any 0$">, 0$">.

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5.
In this paper, we discuss finite rank operators in a closed maximal triangular algebra . Based on the following result that each finite rank operator of can be written as a finite sum of rank one operators each belonging to , we proved that , where , if ; and , if . We also proved that the Erdos Density Theorem holds in if and only if is strongly reducible.

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6.
董浙 《数学学报》2007,50(1):127-130
设d为套代数AlgN的子空间且包含AlgN的所有一秩算子.利用预零化子d⊥中一秩算子,我们给出了单位球d1中端点的刻画.  相似文献
7.
Using the technique of annihilators, we characterize the w^*-closure of the finite-partition submodule R(N, ~) of a weakly closed nest algebra module U completely; and by virtue of this characterization, we obtain a sufficient and necessary condition for U to have a maximal w^*-closed submodule.  相似文献
8.
We introduce a new tensor product and study the weak condition C, which is also called weak exactness, for dual operator spaces. Our definition of weak condition C is equivalent to Kirchberg's notion of weak exactness in the case of von Neumann algebras. We also study the connection of weak exact W-TROs with their linking von Neumann algebras and study the structure of exact (respectively, nuclear) W-TROs.  相似文献
9.
In this paper, we define and study the approximately local lifting property for operator spaces. We show that an operator space V has the approximately local lifting property if and only if V is injective. This implies that an operator space V has the approximately local lifting property if and only if it has the local lifting property.  相似文献
10.
We develop a Hilbert module version of the Haagerup property for general C*-algebras ${{\mathcal{A} \subseteq \mathcal{B}}}$ . We show that if ${\alpha : \Gamma \curvearrowright \mathcal{A}}$ is an action of a countable discrete group Γ on a unital C*-algebra ${\mathcal{A}}$ , then the reduced C*-algebra crossed product ${\Gamma \ltimes _{\alpha, r} \mathcal{A}}$ has the Hilbert ${\mathcal{A}}$ -module Haagerup property if and only if the action α has the Haagerup property. We are particularly interested in the case when ${\mathcal{A} = C(X)}$ is a unital commutative C*-algebra. We compare the Haagerup property of such an action ${\alpha: \Gamma \curvearrowright C(X)}$ with the two special cases when (1) Γ has the Haagerup property and (2) Γ is coarsely embeddable into a Hilbert space. We also prove a contractive Schur mutiplier characterization for groups coarsely embeddable into a Hilbert space, and a uniformly bounded Schur multiplier characterization for exact groups.  相似文献
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