排序方式: 共有28条查询结果,搜索用时 0 毫秒
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本文以Philips VP—700为对象,利用琼斯矩阵法对只读武光盘光学系统以及光学元件进行了详细分析,提出了在只读式光盘机上实现光磁信息处理的理论模型。根据这一模型,本文进而建立了实验系统。实验结果表明理论分析正确。 相似文献
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在当前Xen内置检查点机制中,并未涉及磁盘状态的备份.为保证虚拟机持久状态与瞬时状态的一致性,虚拟机的磁盘状态信息也应该做备份.本文提出的虚拟镜像检查点系统提供了一种可与Xen内置检查点结合的方案来共同保存完整虚拟机状态.虚拟磁盘镜像检查点采用磁盘快照的方式实现,通过更新引用计数和保存磁盘的一级表的形式建立磁盘检查点,在恢复检查点时,只需再次更新磁盘块的引用计数,将之前保存的一级表写入到当前一级表即可.功能测试和性能测试表明,该系统能正确恢复虚拟机出错前的磁盘状态,降低了磁盘检查点设置时间开销和建立快照之后的写操作带来的空间开销. 相似文献
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The neutron star motions are based on the undisturbed finitely thick galactic disk gravitational potential model. Two initial conditions, i.e. the locations and velocities, are considered. The Monte Carlo method is employed to separate rich diversities of the orbits of neutron stars into several sorts. The Poineare section has the potential to play an important role in the diagnosis of the neutron star motion. It has been observed that the increasing ratio of the motion range vertical to the galactic plane to that parallel to the galactic plane results in the irregularity of neutron star motion. 相似文献
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Jae-Hyun YANG 《数学年刊B辑(英文版)》2010,31(1):85-100
Let Dn be the generalized unit disk of degree n. In this paper, Riemannian metrics on the Siegel-Jacobi disk Dn × C(^m,n) which are invariant under the natural action of the Jacobi group are found explicitly and the Laplacians of these invariant metrics are computed explicitly. These are expressed in terms of the trace form. 相似文献
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The magnetohydrodynamic(MHD) flow of the third grade fluid between two permeable disks with heat transfer is investigated.The governing partial differential equations are converted into the ordinary differential equations by suitable transformations.The transformed equations are solved by the homotopy analysis method(HAM).The expressions for square residual errors are defined,and the optimal values of convergencecontrol parameters are selected.The dimensionless velocity and temperature fields are examined for various dimensionless parameters.The skin friction coefficient and the Nusselt number are tabulated to analyze the effects of dimensionless parameters. 相似文献
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A numerical study is carried out for the axisymmetric steady laminar incompressible flow of an electrically conducting micropolar fluid between two infinite parallel porous disks with the constant uniform injection through the surface of the disks. The fluid is subjected to an external transverse magnetic field. The governing nonlinear equations of motion are transformed into a dimensionless form through von Karman’s similarity transformation. An algorithm based on a finite difference scheme is used to solve the reduced coupled ordinary differential equations under associated boundary conditions. The effects of the Reynolds number, the magnetic parameter, the micropolar parameter, and the Prandtl number on the flow velocity and temperature distributions are discussed. The results agree well with those of the previously published work for special cases. The investigation predicts that the heat transfer rate at the surfaces of the disks increases with the increases in the Reynolds number, the magnetic parameter, and the Prandtl number. The shear stresses decrease with the increase in the injection while increase with the increase in the applied magnetic field. The shear stress factor is lower for micropolar fluids than for Newtonian fluids, which may be beneficial in the flow and thermal control in the polymeric processing. 相似文献
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