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   625篇
  免费   70篇
  国内免费   20篇
化学   158篇
晶体学   10篇
力学   87篇
综合类   19篇
数学   185篇
物理学   256篇
  2024年   3篇
  2023年   4篇
  2022年   11篇
  2021年   18篇
  2020年   20篇
  2019年   19篇
  2018年   15篇
  2017年   22篇
  2016年   23篇
  2015年   16篇
  2014年   27篇
  2013年   42篇
  2012年   26篇
  2011年   39篇
  2010年   21篇
  2009年   37篇
  2008年   40篇
  2007年   48篇
  2006年   40篇
  2005年   29篇
  2004年   25篇
  2003年   14篇
  2002年   15篇
  2001年   23篇
  2000年   11篇
  1999年   17篇
  1998年   16篇
  1997年   16篇
  1996年   5篇
  1995年   6篇
  1994年   11篇
  1993年   6篇
  1992年   9篇
  1991年   9篇
  1990年   2篇
  1989年   4篇
  1988年   4篇
  1987年   3篇
  1986年   3篇
  1985年   2篇
  1984年   3篇
  1983年   1篇
  1982年   3篇
  1981年   2篇
  1980年   2篇
  1976年   3篇
排序方式: 共有715条查询结果,搜索用时 15 毫秒
71.
This paper is primarily concern with the formulation and analysis of a reliable numerical method based on the novel alternating direction implicit finite difference scheme for the solution of the fractional reaction–diffusion system. In the work, the integer first‐order derivative in time is replaced with the Caputo fractional derivative operator. As a case study, the dynamics of predator–prey model is considered. In order to provide a good guidelines on the correct choice of parameters for the numerical simulation of full fractional reaction–diffusion system, its linear stability analysis is also examined. The resulting scheme is applied to solve both self‐diffusion and cross‐diffusion problems in two‐dimensions. We observed in the experimental results a range of spatiotemporal and chaotic structures that are related to Turing pattern. It was also discovered in the simulations that cross‐diffusive case gives rise to spatial patterns faster than the diffusive case. Apart from chaotic spiral‐like structures obtained in this work, it should also be mentioned that Turing patterns such as stationary spots and stripes are obtainable, depending on the initial and parameters choices.  相似文献   
72.
研究共同工期安排和具有老化效应的单机排序问题。在整个加工过程中,工件的实际加工时间是与其所在位置和工件本身老化率相关的函数,生产商可以通过支付一定的处罚费用而拒绝加工某些工件。鉴于生产过程中出现老化效应,通过采取维修活动来提高生产率。目标是划分接受工件集和拒绝工件集,确定接受工件集中工件的加工次序和维修活动安排的位置,以极小化接受工件的提前、延误、工期与拒绝工件的总处罚费用的加权和。对这一问题,首先将其转化为指派问题并构造了最优多项式时间算法;其次,证明了目标函数满足一定条件下的问题的更一般形式能够在多项式时间内得到最优解;最后,对本文问题的一个特殊情况,设计了具有更低时间复杂度的多项式动态规划算法。  相似文献   
73.
This paper proposes a new method for eliminating impulse noise. Based on the space characteristic of object and noise, three kinds of basic noise patterns are introduced to describe noise and detect noise candidates. Correspondingly, noise removal operators are presented to remove the impulse noise. Extensive experiment results have shown that the proposed method is better than some of the state-of-the-art methods.  相似文献   
74.
Currently surrogate data analysis can be used to determine if data is consistent with various linear systems, or something else (a nonlinear system). In this paper we propose an extension of these methods in an attempt to make more specific classifications within the class of nonlinear systems.

In the method of surrogate data one estimates the probability distribution of values of a test statistic for a set of experimental data under the assumption that the data is consistent with a given hypothesis. If the probability distribution of the test statistic is different for different dynamical systems consistent with the hypothesis, one must ensure that the surrogate generation technique generates surrogate data that are a good approximation to the data. This is often achieved with a careful choice of surrogate generation method and for noise driven linear surrogates such methods are commonly used.

This paper argues that, in many cases (particularly for nonlinear hypotheses), it is easier to select a test statistic for which the probability distribution of test statistic values is the same for all systems consistent with the hypothesis. For most linear hypotheses one can use a reliable estimator of a dynamic invariant of the underlying class of processes. For more complex, nonlinear hypothesis it requires suitable restatement (or cautious statement) of the hypothesis. Using such statistics one can build nonlinear models of the data and apply the methods of surrogate data to determine if the data is consistent with a simulation from a broad class of models. These ideas are illustrated with estimates of probability distribution functions for correlation dimension estimates of experimental and artificial data, and linear and nonlinear hypotheses.  相似文献   

75.
Because of the complicated geometry of the slotted structure, analytical theories of such structures are inevitably developed on the basis of simplifying assumptions. On the other hand, the accuracy of the theory is of importance to the design of microwave interaction structures. In this study, modes of the slotted waveguide are investigated analytically and simulated with the HFSS code. It is shown that, in spite of the approximations made, the dispersion relation and field patterns of the standard analytical theory are in excellent agreement with the HFSS simulations over the complete range of the slot depth. Modes not built into the theory will also be noted.  相似文献   
76.
Summary The Ginzburg-Landau modulation equation arises in many domains of science as a (formal) approximate equation describing the evolution of patterns through instabilities and bifurcations. Recently, for a large class of evolution PDE's in one space variable, the validity of the approximation has rigorously been established, in the following sense: Consider initial conditions of which the Fourier-transforms are scaled according to the so-calledclustered mode-distribution. Then the corresponding solutions of the “full” problem and the G-L equation remain close to each other on compact intervals of the intrinsic Ginzburg-Landau time-variable. In this paper the following complementary result is established. Consider small, but arbitrary initial conditions. The Fourier-transforms of the solutions of the “full” problem settle to clustered mode-distribution on time-scales which are rapid as compared to the time-scale of evolution of the Ginzburg-Landau equation.  相似文献   
77.
Oldroyd B流体依时性管内流动的变分解析方法   总被引:4,自引:1,他引:3  
韩式方  Ramki.  H 《应用数学和力学》1995,16(2):155-164
在本文中,研究上随体Oldroyd B流体在水平管内依时性流动,该问题可归结为无量纲速度分量三阶偏微分方程的初边值问题,采用改进的Kantorovich方法,将该方程化为各级近似的二阶常微分方程组的初值问题,通过Laplace变换,求得其二阶常微分方程的解析解。在本文中,提出了变分解析的新概念,获得了二级近似变分解析解,其中包括常压力力梯度和周期性压力梯度两种情形,应用计算机符呈处理和Laplac  相似文献   
78.
A method for generating a high visibility digital speckle shearing fringe pattern is proposed. A three-step phase shifting technique which involves the introduction of arbitrary phases is utilized. The phase shifting technique is carried out using a rotating mirror and a theoretical model which involves a linear correlation algorithm is discussed. Experimental results showing correlation fringe patterns and a deformation phase map are presented.  相似文献   
79.
周路群  程熹  欧阳颀 《物理》2005,34(11):797-800
在空间延展系统中,当增强外部光强时,作者观察到波传播的N:N-1(N≥2)锁频现象.此现象是在光敏BZ反应实验中观察到的.通过构建一个映射函数,发现在波周期和外部光强的关系中存在魔鬼阶梯,并且此阶梯与实验数据相吻合.  相似文献   
80.
通过MATLAB工程计算软件,采用步长法、二分法、迭代法和黄金分割法等多种方法.求解了二元理想体系的泡露点问题.结果表明,几种计算值都能与手算值吻合地很好.相对误差远远小于1%,完全满足工程要求;用MATLAB内部函数Solve计算最为便捷.  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