全文获取类型
收费全文 | 12412篇 |
免费 | 1109篇 |
国内免费 | 705篇 |
专业分类
化学 | 1184篇 |
晶体学 | 56篇 |
力学 | 2895篇 |
综合类 | 132篇 |
数学 | 7868篇 |
物理学 | 2091篇 |
出版年
2024年 | 21篇 |
2023年 | 142篇 |
2022年 | 149篇 |
2021年 | 177篇 |
2020年 | 306篇 |
2019年 | 300篇 |
2018年 | 310篇 |
2017年 | 327篇 |
2016年 | 377篇 |
2015年 | 324篇 |
2014年 | 517篇 |
2013年 | 1137篇 |
2012年 | 552篇 |
2011年 | 647篇 |
2010年 | 529篇 |
2009年 | 737篇 |
2008年 | 753篇 |
2007年 | 767篇 |
2006年 | 679篇 |
2005年 | 617篇 |
2004年 | 554篇 |
2003年 | 509篇 |
2002年 | 443篇 |
2001年 | 384篇 |
2000年 | 392篇 |
1999年 | 328篇 |
1998年 | 331篇 |
1997年 | 284篇 |
1996年 | 225篇 |
1995年 | 160篇 |
1994年 | 158篇 |
1993年 | 126篇 |
1992年 | 152篇 |
1991年 | 114篇 |
1990年 | 95篇 |
1989年 | 69篇 |
1988年 | 46篇 |
1987年 | 47篇 |
1986年 | 47篇 |
1985年 | 47篇 |
1984年 | 65篇 |
1983年 | 40篇 |
1982年 | 50篇 |
1981年 | 42篇 |
1980年 | 35篇 |
1979年 | 31篇 |
1978年 | 23篇 |
1977年 | 16篇 |
1976年 | 17篇 |
1973年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
An attempt is made to find out the suitable entrainment and exit boundary conditions in laminar flow situations. Streamfunction vorticity formulation of the Navier–Stokes equations are solved by ADI method. Two‐dimensional laminar plane wall jet flow is used to test different forms of the boundary conditions. Results are compared with the experimental and similarity solution and the proper boundary condition is suggested. The Kind 1 boundary condition is recommended. It consists of zero first derivative condition for velocity variable and for streamfunction equation, mixed derivative at the entrainment and exit boundaries. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
12.
ON A PAIR OF NON-ISOMETRIC ISOSPECTRAL DOMAINS WITH FRACTAL BOUNDARIES AND THE WEYL-BERRY CONJECTURE
ONAPAIROFNONISOMETRICISOSPECTRALDOMAINSWITHFRACTALBOUNDARIESANDTHEWEYLBERRYCONJECTURESLEEMAN,B.D.CHENHUAManuscriptrec... 相似文献
13.
We discuss an error estimation procedure for the global error of collocation schemes applied to solve singular boundary value problems with a singularity of the first kind. This a posteriori estimate of the global error was proposed by Stetter in 1978 and is based on the idea of Defect Correction, originally due to Zadunaisky. Here, we present a new, carefully designed modification of this error estimate which not only results in less computational work but also appears to perform satisfactorily for singular problems. We give a full analytical justification for the asymptotical correctness of the error estimate when it is applied to a general nonlinear regular problem. For the singular case, we are presently only able to provide computational evidence for the full convergence order, the related analysis is still work in progress. This global estimate is the basis for a grid selection routine in which the grid is modified with the aim to equidistribute the global error. This procedure yields meshes suitable for an efficient numerical solution. Most importantly, we observe that the grid is refined in a way reflecting only the behavior of the solution and remains unaffected by the unsmooth direction field close to the singular point. 相似文献
14.
In a previous paper (Ref. 1), an exact solution of the optimal planar interception with fixed end conditions was derived in closed form. The optimal control was expressed as an explicit function of the state variables and two fixed parameters, obtained by solving a set of nonlinear algebraic equations involving elliptic integrals. In order to facilitate the optimal control implementation, the present paper derives a highly accurate simplified solution assuming that the ratio of the pursuer turning radius to the initial range is small. An asymptotic expansion further reduces the computational workload. Construction of a near-optimal open-loop control, based on the approximations, completes the present paper. 相似文献
15.
1引言CPL(毛细泵两相流回路)能传输较高的热负荷,而且不需要循环泵、阀门等运动部件,重量轻可靠性好;在飞行器热控制方面有很好的应用前景[1]。CPL在恶劣的空间环境中运行,需要防止工作介质出现冷冻,为此,我们已经用解析[2]和数值的方法[3]进行了初步的分析,得到了一些可供工程设计参考应用的结果。另外,在恶劣的空间环境中,如果出现冻结,需要融化起动,热管的安全设计需要研究它的融化特性,以确保热管在空间能正常运行。双倒易边界元方法用Laplace基本解[4],通过对一类偏微分方程两侧进行转化,将它全部转化为纯边界积分… 相似文献
16.
Lin Surong 《Annals of Differential Equations》2006,22(4):517-523
The singularly perturbed boundary value problem for nonlinear higher order ordinary differential equation involving two small parameters has been considered. Under appropriate assumptions, for the three cases:ε/μ2→0(μ→0),μ2/ε→0 (ε→0) andε=μ2, the uniformly valid asymptotic solution is obtained by using the expansion method of two small parameters and the theory of differential inequality. 相似文献
17.
Mark Webber 《Mathematical Methods in the Applied Sciences》2006,29(7):819-838
We investigate the influence of slip boundary conditions on the onset of Bénard convection in an infinite fluid layer. It is shown that the critical Rayleigh number is a decreasing function of the slip length, and therefore boundary slip is seen to have a destabilizing effect. Chebyshev‐tau and compound matrix formulations for solving the eigenvalue problem are presented. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
18.
本文定义了二阶微分方程的弱 Carathéodory解 ,在不涉及紧型条件的情形下 ,直接用迭代法证明了 Banach空间二阶非线性常微分方程两点边值问题存在唯一解 ,并给出逼近解迭代序列的误差估计 ,对周期边值问题得到类似的结果 相似文献
19.
P.A. Ramachandran 《Numerical Methods for Partial Differential Equations》2006,22(4):831-846
Time‐dependent differential equations can be solved using the concept of method of lines (MOL) together with the boundary element (BE) representation for the spatial linear part of the equation. The BE method alleviates the need for spatial discretization and casts the problem in an integral format. Hence errors associated with the numerical approximation of the spatial derivatives are totally eliminated. An element level local cubic approximation is used for the variable at each time step to facilitate the time marching and the nonlinear terms are represented in a semi‐implicit manner by a local linearization at each time step. The accuracy of the method has been illustrated on a number of test problems of engineering significance. © 2005 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 2006 相似文献
20.
The structural properties of polycrystalline silicon films, prepared by plasma enhanced chemical vapor deposition system, with different flow rates of SiH4/SiF4 mixtures at 300 °C were investigated. This study indicates that the low hydrogen coverage on the growing surface, under optimum fluorine radicals, will be leaded to an improvement of crystallized area as compared with case of high hydrogen coverage surface. Moreover, the studies of the role of SiH4 and SiF4 radicals show that the SiH4 radicals are important in the nucleation and growth of grains. However, SiF4 radicals are effective in the structural change of grain boundaries regions and by this way, in the present system, establish the growth of grains under the dominant 〈1 1 0〉 direction. The stress investigation indicates that addition of high flow rate of SiF4 in amorphous film, results in the nearly stress free films. Finally, we found that the changes in g-value reflect the changes in the intrinsic compressive and tensile stress in the both polycrystalline and amorphous silicon films. 相似文献