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排序方式: 共有137条查询结果,搜索用时 46 毫秒
1.
A time‐marching formulation is derived from the space–time integrated least squares (STILS) method for solving a pure hyperbolic convection equation and is numerically compared to various known methods. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
2.
张阳 《高等学校计算数学学报》2007,29(4):366-384
1引言Peaceman,Douglas等人于1955年提出了差分格式的交替方向法。随后,Douglas,Dupont于1972年又提出了有限元格式的交替方向法[1]。其基本思想是:对两个或三个空间变量的二阶抛物型和双曲型问题,将交替方向法与Galerkin方法相结合,通过算子分裂技术,把高维问题转化为一系列低维问题,交替地沿各空间变量的方向求解。[2]、[3]和[4]给出了对更一般扩散问题(带对流项的抛物方程)的数值求解和误差分析。 相似文献
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复杂边界条件下渗流场流线分布研究 总被引:15,自引:2,他引:15
流线分布研究已受到油藏工程师们的普遍关注。本文从无限大油藏稳态渗流场基本解出发,结合边界元方法求解出复杂边界条件下稳态渗流场的势分布,以此为基础提出了流线场的生成办法,并给出了应用实例。本文方法的优点在于求解过程中将问题的维数降低了一维,减少了计算量;计算精度较高且具有一定的普遍应用性;适应于求解任意形状的包括定压、定流量或混合边界在内的组合边界问题。实例表明,利用本文方法产生的流线分布因能够较为直观地反映出油藏流体在注采井间的运动轨迹,为优化井网和注入方案提供了重要依据。 相似文献
5.
The mechanical design of the target module of an accelerator driven subcritical nuclear reactor system (ADSS) calls for an
analysis of the related thermal-hydraulic issues because of large amount of heat deposition in the spallation region during
the course of nuclear interactions with the molten lead bismuth eutectic (LBE) target. The LBE also should carry the entire
heat generated as a consequence of the spallation reaction. The problem of heat removal by the LBE is a challenging thermal-hydraulic
issue. For this, one has to examine the flows of low Prandtl number fluids (LBE) in a complex ADSS geometry. In this study,
the equations governing the laminar flow and thermal energy are solved numerically using the streamline upwind Petrov-Galerkin
(SUPG) finite element (FE) method. The target systems with a straight and a nozzle guide have been considered. The principal
purpose of the analysis is to trace the flow and temperature distribution and thereby to check the suitability of the flow
guide in avoiding the recirculation or stagnation zones in the flow space that may lead to hot spots.
相似文献
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The unsteady, three-dimensional full Navier-Stokes equations are solved using a Beam-Warming implicit algorithm in this paper. Computations of the flow over a 76° sweep delta wing at 36.5° angle of attack is presented. The sectional streamlines are depicted and the evolution of the instantaneous crossflow topology of the leading-edge vortex is analyzed. It is found that, along the axis, the topology of the primary vortex alters several times starting from stable focus near the apex to unstable focus, and lasts back to stable focus near wake edge; The stable limit cycle and unstable limit cycle are shown in this evolution. These various altering topologies stem from the stretching and compression of the vortex core. 相似文献
9.
Yuzuru Eguchi 《国际流体数值方法杂志》2002,39(11):1037-1052
In the present paper, the author shows that the predictor/multi‐corrector (PMC) time integration for the advection–diffusion equations induces numerical diffusivity acting only in the streamline direction, even though the equations are spatially discretized by the conventional Galerkin finite element method (GFEM). The transient 2‐D and 3‐D advection problems are solved with the PMC scheme using both the GFEM and the streamline upwind/Petrov Galerkin (SUPG) as the spatial discretization methods for comparison. The solutions of the SUPG‐PMC turned out to be overly diffusive due to the additional PMC streamline diffusion, while the solutions of the GFEM‐PMC were comparatively accurate without significant damping and phase error. A similar tendency was seen also in the quasi‐steady solutions to the incompressible viscous flow problems: 2‐D driven cavity flow and natural convection in a square cavity. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
10.
本文研究三维热传导型半导体器件瞬态模拟问题的数值方法.针对数学模型中各方程不同的特点,分别提出不同的有限元格式.特别针对浓度方程组是对流为主扩散问题的特点,使用Crank-Nicolson差分-流线扩散计算格式,提高了数值解的稳定性.得到的L2误差估计关于空间剖分步长是拟最优的,关于时间步长具有二阶精度. 相似文献