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   14192篇
  免费   2315篇
  国内免费   1823篇
化学   8665篇
晶体学   400篇
力学   1120篇
综合类   174篇
数学   244篇
物理学   7727篇
  2024年   25篇
  2023年   130篇
  2022年   413篇
  2021年   476篇
  2020年   479篇
  2019年   412篇
  2018年   411篇
  2017年   630篇
  2016年   741篇
  2015年   611篇
  2014年   810篇
  2013年   1206篇
  2012年   1051篇
  2011年   908篇
  2010年   797篇
  2009年   882篇
  2008年   834篇
  2007年   918篇
  2006年   787篇
  2005年   704篇
  2004年   691篇
  2003年   571篇
  2002年   502篇
  2001年   396篇
  2000年   398篇
  1999年   392篇
  1998年   319篇
  1997年   278篇
  1996年   225篇
  1995年   198篇
  1994年   168篇
  1993年   187篇
  1992年   145篇
  1991年   92篇
  1990年   93篇
  1989年   74篇
  1988年   91篇
  1987年   53篇
  1986年   41篇
  1985年   25篇
  1984年   16篇
  1983年   10篇
  1982年   29篇
  1981年   24篇
  1980年   15篇
  1979年   23篇
  1978年   15篇
  1977年   10篇
  1976年   7篇
  1974年   5篇
排序方式: 共有10000条查询结果,搜索用时 439 毫秒
101.
This paper describes development of the optical current transducers using flint glass fiber as the Faraday effect sensing element. Excellent polarization properties of the fiber with low birefringence are described, and the design and test data of a current transducer using the fiber manufactured for use in electric power facilities are reviewed. Experimental results on flexible characteristics of a scheme with round trip light transmission in the fiber is also reported.  相似文献   
102.
本文对国产WLY100型顺序扫描ICP光谱仪在设计中对单色仪,高频发生器,扫描机构,测光系统,短紫外光域的测量,恒温,气流控制与软件编制等方案的选择作了详尽的阐述,稳妥的方案使研制工作顺利进行,保证整机一次成功。  相似文献   
103.
文章介绍了高温超导薄膜微波非线性的主要特征,阐述了高温超导薄膜微波非线性产生的原因和相关的研究现状,指出了高温超导薄膜非线性研究中遇到的困难和尚未解决的问题.  相似文献   
104.
A new sensitive isothermal titration microcalorimeter using polyvinylidene difluoride (PVDF) as detector has been developed. Heat pulses of less than 0.4 μJ can be detected and the baseline noise level (p-p) is 40 nW. The calorimeter is constructed with one reaction cell (0.7 ml) insulated by several radiation shields inside a vacuum chamber. The performance of the instrument was examined by measuring the heat of protonation of Tris with HCl. The enthalpy of reaction was found to be ?49±1 kJ·mol?1, in good agreement with the reported value of ?47.5 kJ·mol?1.  相似文献   
105.
Poly(monoitaconates) containing octyl, decyl and dodecyl groups and random monoalkylitaconate-co-vinylpyrrolidone copolymers were studied by thermogravimetric analysis. Copolymers of mono-n-octylitaconate (MOI), mono-n-decylitaconate (MDI), and mono-n-dodecylitaconate (MDoI), respectively, with N-vinyl-2-pyrrolidone (VP) of different compositions were studied by dynamic thermogravimetric analysis. The thermal stability of the copolymers depends on the structure of the monoitaconate comonomer and on the composition of the copolymer The kinetic analysis of the degradation data shows that the thermal decomposition of these copolymers can be described by several kinetic orders depending on the copolymer and on the composition. The relative thermal stability of the copolymers increases as the VP content increases and as the length of the side chain of the itaconate increases, following the same trend as the flexibility of the copolymers in solution.  相似文献   
106.
伏安式新型溶解氧传感器的研究   总被引:2,自引:0,他引:2  
王宅中  卢文 《分析化学》1992,20(11):1355-1358
  相似文献   
107.
本文在Skyr}e相互作用、核物质近似和自洽半经典方法的基础上,将微观光学势的自洽研究推J“到中能区(60-r300MeV),研究了”+907r在该能区光学势的径向形状和温度效应  相似文献   
108.
We present a calculation of the electronic Raman cross section for the scattering of light across the energy gap of an antiferromagnetic insulator. The antiferromagnet is described in terms of a spin density wave state for the Hubbard model at half filling. We consider the coupling of the light to the current density and the inverse mass tensor on equal footing. A comparison of the cross section for different scattering geometries is given.  相似文献   
109.
光纤法布里-珀罗传感器腔长的傅里叶变换解调原理研究   总被引:10,自引:7,他引:3  
章鹏  朱永  陈伟民 《光子学报》2004,33(12):1449-1452
在宽带光源条件下对光纤法布里-珀罗传感器腔长的傅里叶变换解调原理进行了详细的理论推导,在此基础上给出了具体的实现算法和仿真对比实验.仿真结果表明:采用傅里叶变换可以有效地对光纤法布里-珀罗传感器进行腔长解调.  相似文献   
110.
The motivation of this work is to provide reliable and accurate modeling studies of the physical (surface, thermal, mechanical and gas diffusion) properties of chitosan (CS) polymer. Our computational efforts have been devoted to make a comparison of the structural bulk properties of CS with similar type of polymers such as chitin and cellulose through cohesive energy density, solubility parameter, hydrogen bonding, and free volume distribution calculations. Atomistic modeling on CS polymer using molecular mechanics (MM) and molecular dynamics (MD) simulations has been carried out in three dimensionally periodic and effective two dimensionally periodic condensed phases. From the equilibrated structures, surface energies were computed. The equilibrium structure of the films shows an interior region of mass density close to the value in the bulk state. Various components of energetic interactions have been examined in detail to acquire a better insight into the interactions between bulk structure and the film surface. MD simulation (NPT ensemble) has also been used to obtain polymer specific volume as a function of temperature. It is demonstrated that these VT curves can be used to locate the volumetric glass transition temperature (Tg) reliably. The mechanical properties of CS have been obtained using the strain deformation method. Diffusion coefficients of O2, N2, and CO2 gas molecules at 300 K in CS have been estimated. The calculated properties of CS are comparable with the experimental values reported in the literature. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1260–1270, 2007  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