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   8368篇
  免费   1328篇
  国内免费   1756篇
化学   6864篇
晶体学   152篇
力学   499篇
综合类   158篇
数学   1002篇
物理学   2777篇
  2024年   24篇
  2023年   120篇
  2022年   219篇
  2021年   246篇
  2020年   333篇
  2019年   309篇
  2018年   310篇
  2017年   267篇
  2016年   397篇
  2015年   440篇
  2014年   565篇
  2013年   611篇
  2012年   706篇
  2011年   738篇
  2010年   626篇
  2009年   618篇
  2008年   636篇
  2007年   554篇
  2006年   504篇
  2005年   457篇
  2004年   440篇
  2003年   361篇
  2002年   422篇
  2001年   353篇
  2000年   308篇
  1999年   214篇
  1998年   123篇
  1997年   82篇
  1996年   93篇
  1995年   80篇
  1994年   44篇
  1993年   53篇
  1992年   39篇
  1991年   36篇
  1990年   27篇
  1989年   18篇
  1988年   18篇
  1987年   16篇
  1986年   11篇
  1985年   8篇
  1984年   8篇
  1983年   3篇
  1982年   3篇
  1981年   2篇
  1974年   1篇
  1971年   3篇
  1959年   1篇
  1957年   1篇
  1936年   1篇
  1916年   1篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
This review deals with the high-throughput field in surface catalysis and adsorption. Special focus is placed on advanced methods for knowledge discovery such as density functional theory (DFT) simulations. An inventory of successful cases on several elements in Group I-B and VIII is reported, including the relevant data and knowledge management, which are very important in chemical industry, fuel cell, and environment protection, for both scientific and economical reasons.   相似文献   
62.
A scheme of the generation of entangled qutrits is presented, and then is generalized to entangled ququads and entangled qudits. With the entangled qutrits, an experimental scheme of probability superdense coding with only linear optical elements is proposed. It is shown that this scheme will be suitable for the entangled ququads, even for the entangled qudits if some nonlinearity is used. This scheme is feasible in the laboratory with the current experimental technology.  相似文献   
63.
天然气在不同初始温度和压力下的燃烧特性研究   总被引:1,自引:0,他引:1  
利用定容燃烧弹研究了不同初始温度和初始压力下的天然气燃烧特性,分析了初始温度、初始压力和当量比对其燃烧过程的影响.研究结果表明:随着初始温度的升高(300~450 K),天然气质量燃烧速率明显增加,燃烧持续期和火焰发展期显著缩短.随着初始压力的升高(0.1~0.75 MPa),天然气质量燃烧速率明显减慢,燃烧持续期和火焰发展期显著增长.且稀混合气和浓混合气条件下初始温度和初始压力的变化对燃烧持续期和火焰发展期的影响更明显.  相似文献   
64.

Background  

Bone marrow mesenchymal stem cells (MSCs) are one of the potential tools for treatment of the spinal cord injury; however, the survival and differentiation of MSCs in an injured spinal cord still need to be improved. In the present study, we investigated whether Governor Vessel electro-acupuncture (EA) could efficiently promote bone marrow mesenchymal stem cells (MSCs) survival and differentiation, axonal regeneration and finally, functional recovery in the transected spinal cord.  相似文献   
65.
胡永红  徐庆  刘中柱 《中国物理 B》2009,18(4):1367-1372
The chirality-asymmetry macroscopic force mediated by light pseudoscalar particles between α -quartz and some achiral matter is studied. If this force between achiral source mass and α -quartz with some chirality is attractive, it will become repulsive when the chirality of the α -quartz crystal is changed. According to the tested limits of the coupling constant gs gp /\hbar c< 1.5× 10-24 at the Compton wavelength λ = 10-3 m, the force (F) between a 0.08× 0.08× 0.002 m3 block of α -quartz and a 0.08× 0.08× 0.01 m3 copper block with a separation being 0.5× 10-3 \mbox{m} in between, is estimated from the published data at less than 4.64× 10-24 N, i.e. F < 4.64× 10-24 N.  相似文献   
66.
林青 《中国物理 B》2009,18(1):51-55
In this paper, we propose an experimental scheme for unambiguous quantum state comparison assisted by linear optical manipulations, twin-photons produced from parametric down-conversion, and postselection from the coincidence measurement. In this scheme the preparation of the general two mixed qubit states with arbitrary prior probabilities and the realization of the optimal POVMs for unambiguous quantum state comparison are presented. This proposal is feasible by current experimental technology, and may be used in single-qubit quantum fingerprinting.  相似文献   
67.
A mathematical technique based on the consideration of a nonlinear partial differential equation together with an additional condition in the form of an ordinary differential equation is employed to study a nonlinear reaction diffusion equation which describes a real process in physics and in chemistry. Several exact solutions for the equation are acquired under certain circumstances.  相似文献   
68.
We introduce a new spectrum transform into the image fusion field and propose a novel fusion method based on discrete fractional random transform (DFRNT). In DFRNT domain, high amplitude spectrum (HAS) and low amplitude spectrum (LAS) components carry different information of original images. For different fusion goals, different fusion rules can be adopted in HAS and LAS components, respectively. The proposed method is applied to fuse real multi-spectral (MS) and panchromatic (Pan) images. The fused image is observed to preserve both spectral information of MS and spatial information of Pan. Spectrum distribution of DFRNT is random and uniform, which guarantees that good information is reserved.  相似文献   
69.
The electronic structures, deformation charge density, dipole moment, and optical properties of N-La-codoped anatase titanium dioxide (TiO2) are studied using the plane-wave ultrasoft pseudopotential method based on the density functional theory (DFT). The optical properties of two-ion-doped TiO2 are analyzed via electronic structures, deformation charge density, and dipole moment. For the model of N-La-doped TiO2 , a smaller atom fraction of N and La atoms induces better optical properties. The absorption edges of two doped TiO2 models redshift to the visible-light region.  相似文献   
70.
The nonlinear vibrations of a thin, elastic, laminated composite circular cylindrical shell, moving in axial direction and having an internal resonance, are investigated in this study. Nonlinearities due to large-amplitude shell motion are considered by using Donnell’s nonlinear shallow-shell theory, with consideration of the effect of viscous structure damping. Differently from conventional Donnell’s nonlinear shallow-shell equations, an improved nonlinear model without employing Airy stress function is developed to study the nonlinear dynamics of thin shells. The system is discretized by Galerkin’s method while a model involving four degrees of freedom, allowing for the traveling wave response of the shell, is adopted. The method of harmonic balance is applied to study the nonlinear dynamic responses of the multi-degrees-of-freedom system. When the structure is excited close to a resonant frequency, very intricate frequency–response curves are obtained, which show strong modal interactions and one-to-one-to-one-to-one internal resonance phenomenon. The effects of different parameters on the complex dynamic response are investigated in this study. The stability of steady-state solutions is also analyzed in detail.  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