首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2290篇
  免费   145篇
  国内免费   39篇
化学   113篇
晶体学   11篇
力学   1176篇
综合类   2篇
数学   628篇
物理学   544篇
  2024年   1篇
  2023年   22篇
  2022年   20篇
  2021年   25篇
  2020年   48篇
  2019年   52篇
  2018年   57篇
  2017年   58篇
  2016年   65篇
  2015年   67篇
  2014年   69篇
  2013年   190篇
  2012年   87篇
  2011年   115篇
  2010年   114篇
  2009年   140篇
  2008年   121篇
  2007年   137篇
  2006年   110篇
  2005年   120篇
  2004年   96篇
  2003年   99篇
  2002年   74篇
  2001年   54篇
  2000年   64篇
  1999年   59篇
  1998年   59篇
  1997年   45篇
  1996年   41篇
  1995年   30篇
  1994年   33篇
  1993年   43篇
  1992年   31篇
  1991年   33篇
  1990年   13篇
  1989年   20篇
  1988年   18篇
  1987年   8篇
  1986年   10篇
  1985年   5篇
  1984年   8篇
  1983年   2篇
  1982年   4篇
  1981年   3篇
  1977年   2篇
  1975年   1篇
  1969年   1篇
排序方式: 共有2474条查询结果,搜索用时 15 毫秒
31.
臧保将  商朋见 《中国物理》2007,16(3):565-569
This paper deals with time series of the Yellow River daily flows at Tongguan hydrological station, from the year 2000 to 2005. Power spectrum analysis and statistical moment scaling function on a range of scales revealed scaling qualities of the data. The partition function, which displayed a convex curvature, and the generalized dimension function showed that multifractality is presented. The singularity spectrum, which is single-humped, has shown strong multifractality degree.  相似文献   
32.
33.
The effect of shear flow on the phase-ordering dynamics of a binary mixture with field-dependent mobility is investigated. The problem is addressed in the context of the time-dependent Ginzburg-Landau equation with an external velocity term, studied in self-consistent approximation. Assuming a scaling ansatz for the structure factor, the asymptotic behavior of the observables in the scaling regime can be analytically calculated. All the observables show log-time periodic oscillations which we interpret as due to a cyclical mechanism of stretching and break-up of domains. These oscillations are damped as consequence of the vanishing of the mobility in the bulk phase. Received 13 April 1999  相似文献   
34.
用改进的随机轨道模型数值模拟突扩液固两相流动   总被引:2,自引:0,他引:2  
用改进的随机轨道模型数值模拟了突扩湍流液固两相流动。两相的轴向速度和湍动能的预报结果与实验符合得很好,同时还给出了不同计算截面上颗粒数密度和质量流量合理分布.预报结果对计算颗粒数敏感程度的研究表明:与通常的随机轨道不同,改进的随机轨道模型只需要很少的计算颗粒就可以给出合理正确的颗粒相分布。  相似文献   
35.
不同负冲角工况下透平叶栅二次流的数值模拟及分析   总被引:1,自引:0,他引:1  
本文应用TVD格式和Baldwin-Lomax代数紊流模型求解三维NS方程,对一个透平直列叶栅流场在两个不同的负冲角工况下进行了数值模拟,给出了叶栅马蹄涡及其分离鞍点、通道涡、角涡等二次流涡系的结构及其产生发展过程,并对不同工况下的涡系结构及冲角的影响作了详细的分析和比较.本文结果有助于对叶栅二次流涡系结构的产生发展机制的深入了解,同时表明所用数值求解技术有较高的精度和分辨率。  相似文献   
36.
The generalized Riemann problem (GRP) scheme for the Euler equations and gas-kinetic scheme (GKS) for the Boltzmann equation are two high resolution shock capturing schemes for fluid simulations. The difference is that one is based on the characteristics of the inviscid Euler equations and their wave interactions, and the other is based on the particle transport and collisions. The similarity between them is that both methods can use identical MUSCL-type initial reconstructions around a cell interface, and the spatial slopes on both sides of a cell interface involve in the gas evolution process and the construction of a time-dependent flux function. Although both methods have been applied successfully to the inviscid compressible flow computations, their performances have never been compared. Since both methods use the same initial reconstruction, any difference is solely coming from different underlying mechanism in their flux evaluation. Therefore, such a comparison is important to help us to understand the correspondence between physical modeling and numerical performances. Since GRP is so faithfully solving the inviscid Euler equations, the comparison can be also used to show the validity of solving the Euler equations itself. The numerical comparison shows that the GRP exhibits a slightly better computational efficiency, and has comparable accuracy with GKS for the Euler solutions in 1D case, but the GKS is more robust than GRP. For the 2D high Mach number flow simulations, the GKS is absent from the shock instability and converges to the steady state solutions faster than the GRP. The GRP has carbuncle phenomena, likes a cloud hanging over exact Riemann solvers. The GRP and GKS use different physical processes to describe the flow motion starting from a discontinuity. One is based on the assumption of equilibrium state with infinite number of particle collisions, and the other starts from the non-equilibrium free transport process to evolve into an equilibrium one through particle collisions. The different mechanism in the flux evaluation deviates their numerical performance. Through this study, we may conclude scientifically that it may NOT be valid to use the Euler equations as governing equations to construct numerical fluxes in a discretized space with limited cell resolution. To adapt the Navier–Stokes (NS) equations is NOT valid either because the NS equations describe the flow behavior on the hydrodynamic scale and have no any corresponding physics starting from a discontinuity. This fact alludes to the consistency of the Euler and Navier–Stokes equations with the continuum assumption and the necessity of a direct modeling of the physical process in the discretized space in the construction of numerical scheme when modeling very high Mach number flows. The development of numerical algorithm is similar to the modeling process in deriving the governing equations, but the control volume here cannot be shrunk to zero.  相似文献   
37.
Many natural rock systems contain small patches of different permeability which affect the flow of fluids through them. As these heterogeneities become smaller and more numerous, they become harder to model numerically. We consider how to reduce the computational effort required in simulations by incorporating their effects in the boundary conditions at the edges of each grid block. This is in contrast with current methods which involve often arbitrary changes in the fluid properties. The method is restricted to the case of widely-spaced patches, which simplifies interaction effects. The system then reduces to an array of dipoles, and two averaging methods are proposed for finite grid blocks. Several infinite systems, including vertical and horizontal bands, are also considered as further approximations. There is a great wealth of existing results from different fields which lead to identical mathematical problems and which can be used in these cases. Finally, we consider how to use these techniques when the precise configuration of the grid block is not known, but only its statistical properties. This can lead to results which are very different from the deterministic case.  相似文献   
38.
 The theorem of Birkhoff – von Neumann concerns bistochastic matrices (i.e., matrices with nonnegative real entries such that all row sums and all column sums are equal to one). We consider here real matrices with entries unrestricted in sign and we extend the notion of permutation matrices (integral bistochastic matrices); some generalizations of the theorem are derived by using elementary properties of graph theory. Received: October 10, 2000 Final version received: April 11, 2002  相似文献   
39.
We study incompressible tori in 3-manifolds supporting pseudo-Anosov flows and more generally ZZ subgroups of the fundamental group of such a manifold. If no element in this subgroup can be represented by a closed orbit of the pseudo-Anosov flow, we prove that the flow is topologically conjugate to a suspension of an Anosov diffeomorphism of the torus. In particular it is non singular and is an Anosov flow. It follows that either a pseudo-Anosov flow is topologically conjugate to a suspension Anosov flow, or any immersed incompressible torus can be realized as a free homotopy from a closed orbit of the flow to itself. The key tool is an analysis of group actions on non-Hausdorff trees, also known as R-order trees – we produce an invariant axis in the free action case. An application of these results is the following: suppose the manifold has an R-covered foliation transverse to a pseudo-Anosov flow. If the flow is not an R-covered Anosov flow, then it follows that the manifold is atoroidal.  相似文献   
40.
An incremental algorithm may yield an enormous computational time saving to solve a network flow problem. It updates the solution to an instance of a problem for a unit change in the input. In this paper we have proposed an efficient incremental implementation of maximum flow problem after inserting an edge in the network G. The algorithm has the time complexity of O((n)2 m), where n is the number of affected vertices and m is the number of edges in the network. We have also discussed the incremental algorithm for deletion of an edge in the network G.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号