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   5167篇
  免费   682篇
  国内免费   407篇
化学   1207篇
晶体学   39篇
力学   613篇
综合类   128篇
数学   2094篇
物理学   2175篇
  2024年   16篇
  2023年   35篇
  2022年   116篇
  2021年   108篇
  2020年   164篇
  2019年   162篇
  2018年   151篇
  2017年   150篇
  2016年   188篇
  2015年   160篇
  2014年   238篇
  2013年   438篇
  2012年   284篇
  2011年   314篇
  2010年   258篇
  2009年   332篇
  2008年   322篇
  2007年   320篇
  2006年   303篇
  2005年   287篇
  2004年   251篇
  2003年   227篇
  2002年   219篇
  2001年   163篇
  2000年   154篇
  1999年   121篇
  1998年   120篇
  1997年   115篇
  1996年   74篇
  1995年   79篇
  1994年   74篇
  1993年   45篇
  1992年   45篇
  1991年   41篇
  1990年   32篇
  1989年   18篇
  1988年   23篇
  1987年   14篇
  1986年   17篇
  1985年   17篇
  1984年   10篇
  1983年   4篇
  1982年   16篇
  1981年   5篇
  1980年   3篇
  1979年   6篇
  1977年   5篇
  1976年   2篇
  1973年   2篇
  1959年   4篇
排序方式: 共有6256条查询结果,搜索用时 15 毫秒
11.
We present integral-type Darboux transformation for the mKdV hierarchy and for the mKdV hierarchy withself-consistent sources. In contrast with the normal Darboux transformation, the integral-type Darboux transformationscan offer non-auto-Backlund transformation between two (2n 1)-th mKdV equations with self-consistent sources withdifferent degrees. This kind of Darboux transformation enables us to construct the N-soliton solution for the mKdVhierarchy with self-consistent sources. We also propose the formulas for the m times repeated integral-type Darbouxtransformations for both mKdV hierarchy and mKdV hierarchy with self-consistent sources.  相似文献   
12.
13.
The growth mechanism of the peritectic η phase involving the peritectic reaction and peritectic transformation in Cu-70%Sn alloy was investigated under directional solidification. The results show that a major growth mechanism in thickening of the peritectic η-layer is not the peritectic reaction but the peritectic transformation. The transformation temperature and isothermal time play crucial roles in determining the volume fraction and the thickness of the peritectic η phase. With the increase of the temperature and isothermal time, the volume fraction of the peritectic η phase increases. The regressed data show that the relationship between the thickness of η phase (Δx) and the transformation temperature (T) meets the following equation In Δx=6.5−1673 1 / T. Additionally, there exists a relationship between the thickness of the η phase (Δx) and the isothermal time (t) at the 9 mm solidification distance below the peritectic reaction interface, Δx=0.72t 1/2, which is consistent with the theoretical model. Supported by the National Science Foundation of China (Grant No. 50395102)  相似文献   
14.
A finite element solution of the Navier-Stokes equations for steady flow under the magnetic effect through a double-branched two-dimensional section of a three-dimensional model of the canine aorta is discussed. The numerical scheme involves transforming the physical co-ordinates to a curvilinear boundary-fitted co-ordinate system. The shear stress at the wall is calculated for a Reynolds number of 1000 with the branch-to-main aortic flow rate ratio as a parameter. The results are compared with earlier works involving experimental data and found to be in reasonable qualitative agreement. The steady flow, shear stress and branch flow under the effect of a magnetic field have been discussed in detail.  相似文献   
15.
A new method of using time-averaged digital speckle pattern interferometry for the quantitative measurement of vibration amplitude was developed. Signal processing techniques especially the Hilbert transformation for quantitative evaluation of the Bessel fringes obtained in time-averaged digital speckle pattern interferometry were explored. The quadrature signal after Hilbert transformation is equivalent to a 90° phase-shifted interferogram for a monotonically increasing or decreasing phase function. An algorithm was developed for Bessel fringe contrast enhancement and phase extraction. The techniques were tested numerically and experimentally. Sub-fringe quantification of the time-averaged vibration fringes is realised with the proposed method. Compared with the commonly used phase shift method which requires a minimum of two images for image processing, this method requires only one fringe pattern for data extraction.  相似文献   
16.
The Hawking radiation of Dirac particles in an arbitrarily rectilinearly accelerating Kinnersley black hole with electromagnetic charge and cosmological constant is investigated by using the generalized tortoise coordinate transformation. Both the location and the temperature of the event horizon depend on the time and the polar angle. The Hawking thermal radiation spectrum of Dirac particles is also derived.  相似文献   
17.
金天允 《光学学报》1991,11(3):78-282
本文在相干理论的基础上,推导了光栅成像中的光强分布和物像位置关系,并给出一组具有不同参数的实验照片及一组借助计算机绘制的强度分布图。  相似文献   
18.
Cyclic reduction and Fourier analysis-cyclic reduction (FACR) methods are presented for the solution of the linear systems which arise when orthogonal spline collocation with piecewise Hermite bicubics is applied to boundary value problems for certain separable partial differential equations on a rectangle. On anN×N uniform partition, the cyclic reduction and Fourier analysis-cyclic reduction methods requireO(N 2log2 N) andO(N 2log2log2 N) arithmetic operations, respectively.  相似文献   
19.
研究了用频域法实现圆环形目标物计数的方法。对空域中含有圆环形目标物的二值图像,经傅里叶变换后在频域内进行滤波,再经傅里叶反变换后取一阈值进行处理,则对应于圆环形目标物即变为一个实心体,然后对实心体进行计数即可实现对圆环形目标物的计数。对该方法进行了数学描述,并分别用模拟图像和实际图像进行了实验。结果表明,该方法消除噪声的效果好,对部分封闭圆的检测同样有效,且可用于目标物有粘连的情况。该方法对圆环形目标物的尺寸相差不大的情况更为有效。  相似文献   
20.
给出了 n元函数极值的一个充分条件 ,并结合矩阵的初等变换建立了 n元函数极值的一种快速判别法 ,最后给出了一个例子  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