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   9747篇
  免费   1783篇
  国内免费   796篇
化学   3289篇
晶体学   75篇
力学   992篇
综合类   71篇
数学   486篇
物理学   7413篇
  2024年   7篇
  2023年   53篇
  2022年   183篇
  2021年   197篇
  2020年   231篇
  2019年   173篇
  2018年   204篇
  2017年   321篇
  2016年   402篇
  2015年   351篇
  2014年   653篇
  2013年   811篇
  2012年   596篇
  2011年   685篇
  2010年   480篇
  2009年   642篇
  2008年   731篇
  2007年   668篇
  2006年   584篇
  2005年   577篇
  2004年   576篇
  2003年   478篇
  2002年   393篇
  2001年   356篇
  2000年   316篇
  1999年   287篇
  1998年   261篇
  1997年   224篇
  1996年   175篇
  1995年   166篇
  1994年   114篇
  1993年   94篇
  1992年   73篇
  1991年   65篇
  1990年   34篇
  1989年   30篇
  1988年   27篇
  1987年   22篇
  1986年   15篇
  1985年   11篇
  1984年   18篇
  1983年   7篇
  1982年   6篇
  1981年   7篇
  1980年   6篇
  1979年   2篇
  1977年   6篇
  1976年   2篇
  1968年   1篇
  1957年   3篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Summary Considered here are model equations for weakly nonlinear and dispersive long waves, which feature general forms of dispersion and pure power nonlinearity. Two variants of such equations are introduced, one of Korteweg-de Vries type and one of regularized long-wave type. It is proven that solutions of the pure initial-value problem for these two types of model equations are the same, to within the order of accuracy attributable to either, on the long time scale during which nonlinear and dispersive effects may accumulate to make an order-one relative difference to the wave profiles.This research was supported in part by the National Science Foundation. A considerable portion of the project was completed while the first author was resident at the Institute for Mathematics and Its Applications, University of Minnesota.  相似文献   
2.
介绍了几种光纤干涉仪等臂长技术,比较了各自的优缺点和适用范围,对光纤干涉仪的平衡有较大的参考价值。  相似文献   
3.
4.
An Nd:YAG laser-pumped periodically poled RbTiOAsO4 (PPRTA) optical parametric oscillator (OPO) near degeneracy is reported. At a pump power of 3.7 W, a net conversion efficiency of 43% was obtained. These crystals were found to be phase-matchable for the higher order quasi-phase-matched second-harmonic generation (SHG) in the visible range. Detailed analyses of the phase-matching properties for these processes were made by using the published Sellmeier and thermo-optic dispersion formulas.  相似文献   
5.
光纤的能量传输特性及应用   总被引:5,自引:0,他引:5  
项仕标  冯长根 《光学技术》2002,28(4):341-342
着重分析了影响光纤传输能量以及光纤传输中造成能量损耗的因素。这些因素主要包括光纤材料、构造、光纤的折射率分布、光纤的长度和芯径、光纤的数值孔径和热效应以及耦合等。同时 ,结合激光二极管点火的实例 ,分析探讨了其背景和应用价值。结论是 :为了尽可能减少能量损耗、提高光纤输出的激光功率和激光功率密度 ,应当选取合适的激光工作波长、较小的光纤长度、较小的芯径和较小的数值孔径 ,应采用渐变折射率分布光纤 ,应减少弯曲与耦合  相似文献   
6.
We derive an explicit autocorrelation function (ACF) formula of state of polarization for a fiber transmission system with polarization mode dispersion (PMD) and polarization dependent loss (PDL), which is found to agree well with Monte Carlo simulation. Then we use the new ACF to investigate the combined effect of PMD and PDL on the polarization multiplexed scheme. We find the performance of the polarization multiplexed scheme can be deteriorated more severely than the case without PDL.  相似文献   
7.
用于机械振动实时监测的光纤光栅有源传感装置   总被引:4,自引:1,他引:3  
把一对中心反射波长分别为1562.11nm和1562.71nm的光纤光栅粘贴在均质、等厚、等腰三角形悬臂梁上下表面作为环形腔光纤激光器端镜,当机械振动激励自由端时,通过观测激光输出脉冲,地施加于自由端的机械振动的频率进行了实时监测;观察两光栅波长漂移量差值的变化,可在0~6.1mm的范围内判断所测振动的振幅。低于100Hz时,实验结果与实际值基本吻合。  相似文献   
8.
锥形光纤间耦合特性的分析与检测   总被引:2,自引:0,他引:2  
将通信光纤的末端拉制成锥形,利用光信号在光纤锥形区特有的传输和耦合特性,实现了光纤的耦合、连接和分束。用耦合模理论分析了锥形光纤间的传输和耦合性质,给出了光信号两锥形光纤间的耦合与两锥形光纤的距离和锥形区重叠长度等实验结果。  相似文献   
9.
A fiber-optic chemical sensor (FOCS) for detection of nitrogen dioxide (NO2) molecules is reported. The FOCS presents an optropode structure because of the transmission properties of the sensitive material. The NO2 FOCS is activated by using the semiconductor polymer: regioregular head-to-tail poly(3-octylthiophene-2,5-diyl). The operation wavelength of the sensor is 543.5 nm such that a simple LED and detector can be used for the design of this device. The sensor response decreases after each exposure, demonstrating the reduction in sensitivity as well as irreversibility lower than 5%. However, its properties such as rapid response, high selectivity, high sensitivity (0.43 ± 0.01 muW/ppm), hygroscopic properties, and its operation at room temperature make this kind of FOCS a good alternative for NO2 toxic gas detection.  相似文献   
10.
A two-step swelling procedure was adopted to synthesize mono-dispersed and highly cross-linked poly (St-divinylbenzene) particles with PSt micro-spheres (1.80 μm in diameter). The PSt micro-spheres were prepared by a dispersion polymerization method and used as seeds. The effects of monomer concentration, ratio of ethanol to water, swelling reagents, crosslinking reagents, swelling temperature and agitation speed on particle size were investigated in detail. The morphologies and size distributions of these micro-spheres were examined by SEM and particle size analysis (PSA). The T g of the micro-spheres was measured by DSC. The results indicate that the particles (6.20 μm in diameter) exhibit excellent mono dispersed property and high crosslinking degree when the concentration of the swelling reagent was 25%, the concentration of the crosslinking reagents was 23%, the swelling temperature was 30°C and the stirring speed was 150 r/min. __________ Translated from Chinese Journal of Applied Chemistry, 2007, 24(11): 1289–1294  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