全文获取类型
收费全文 | 5424篇 |
免费 | 1466篇 |
国内免费 | 2475篇 |
专业分类
化学 | 4702篇 |
晶体学 | 177篇 |
力学 | 683篇 |
综合类 | 195篇 |
数学 | 579篇 |
物理学 | 3029篇 |
出版年
2024年 | 49篇 |
2023年 | 157篇 |
2022年 | 227篇 |
2021年 | 209篇 |
2020年 | 194篇 |
2019年 | 179篇 |
2018年 | 131篇 |
2017年 | 189篇 |
2016年 | 207篇 |
2015年 | 273篇 |
2014年 | 492篇 |
2013年 | 425篇 |
2012年 | 356篇 |
2011年 | 444篇 |
2010年 | 454篇 |
2009年 | 499篇 |
2008年 | 564篇 |
2007年 | 517篇 |
2006年 | 427篇 |
2005年 | 404篇 |
2004年 | 372篇 |
2003年 | 367篇 |
2002年 | 304篇 |
2001年 | 287篇 |
2000年 | 195篇 |
1999年 | 193篇 |
1998年 | 176篇 |
1997年 | 177篇 |
1996年 | 156篇 |
1995年 | 156篇 |
1994年 | 108篇 |
1993年 | 87篇 |
1992年 | 92篇 |
1991年 | 65篇 |
1990年 | 82篇 |
1989年 | 68篇 |
1988年 | 24篇 |
1987年 | 16篇 |
1986年 | 11篇 |
1985年 | 17篇 |
1984年 | 7篇 |
1983年 | 8篇 |
排序方式: 共有9365条查询结果,搜索用时 312 毫秒
11.
We experimentally demonstrate that the entanglement can be created on two distant particles using separable states. We show that two working particles can share some entanglement, while one ancilla particle always remains separable from the two working particles during the experimental evolution of the system. Our experiment can be viewed as a benchmark to illustrate the idea that no prior entanglement is necessary to create entanglement. 相似文献
12.
Dissociative Chemisorption of an H2(v,j) Molecule on Rigid Ni (100) Surface: Dependence on Surface Topologies and Initial Rovibrational States of the Molecules
下载免费PDF全文
![点击此处可从《中国物理快报》网站下载免费的PDF全文](/ch/ext_images/free.gif)
MeryemEvecen MustafaBǒyǚkata MehmetCivi ZiyaB.Gǚvenc 《中国物理快报》2005,22(2):420-423
The H2(v,j) Ni(100) collision system has been studied to understand the effects of the surface sites and initial rovibrational states of the molecule on molecule-surface interactions, by a quasiclassical molecular dynamic simulation method. Dissociative adsorption of an H2 molecule on the rigid Ni(100) surface is investigated at topologically different three sites of the surface. Interaction between the molecule and Ni surface was described by a London-Eyring-Polani-Sato (LEPS) potential. Dissociative chemisorption probabilities of the H2(v, j) molecule on various sites of the surface are presented as a function of the translation energies between 0.001-1.0eV. The probabilities obtained at each collision site have unique behaviour. At lower collision energies, indirect processes enhance the reactivity, effects of the rotational excitations and impact sites on the reactivity are more pronounced. The results are compared with the available studies. The physical mechanisms underlying the results and quantum effects are discussed. 相似文献
13.
Effects of External Electric Field on Ferroelectric Superlattice with Two Alternating Layers
下载免费PDF全文
![点击此处可从《中国物理快报》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The effects of the external electric field on the ferroelectric superlattice with two alternating layers have been studied using the transverse Ising model based on the effective-field theory with the differential technique. The hysteresis loops and susceptibility of the system have been given. The stronger the external electric field, the smaller the susceptibility, reflecting that the polarization is weaker. 相似文献
14.
15.
16.
著名电化学家、中国科学院资深院士吴浩青教授今年迎来他的九秩华诞.在半个多世纪来,吴老以他广博的学识和勤奋的精神为我国电化学事业作出了突出的贡献. 相似文献
17.
汪更生 《数学物理学报(B辑英文版)》2005,25(1):7-22
This paper deals with maximum principle for some optimal control problem governed by some elliptic variational inequalities. Some state constraints are discussed. The basic techniques used here are based on those in [1] and a new penalty functional defined in this paper. 相似文献
18.
胡迪鹤 《数学物理学报(B辑英文版)》2005,25(1):23-29
This paper is a continuation of [8]. In Section 1, three kinds of communication are introdnced for two states and the relations among them are investigated. In Section 2, two kinds of period of a state are introdnced and it is obtained that the period is a “class property” ,i.e. two states x and y belong to same class implies the period of x is equal to the period of y. 相似文献
19.
20.
利用低压MOCVD工艺分别在(001)取向的LaAlO3,SrTiO3和重掺杂硅单晶衬底上制备PbTiO3铁电薄膜,并通过X射线衍射谱对薄膜的微结构进行分析.X射线θ-2θ扫描显示硅衬底上得到了PbTiO3多晶薄膜,另两种衬底上得到了择优取向的PbTiO3薄膜.LaAlO3衬底上的PbTiO3薄膜有a和c两个取向,也就是薄膜中存在着90°畴结构,而生长在SrTiO3衬底上的PbTiO3薄膜中只存在c方向的择优取向.由于薄膜的尺度效应,发现c轴晶格常数与块材相比均缩短.X射线的φ扫描验证了后两类薄膜的外延特性,利用同步辐射的高强度和高能量分辨率用摇摆曲线方法研究了这两种外延薄膜的品质,进一步证明了SrTiO3衬底上的PbTiO3薄膜的单畴特性.利用重掺杂的硅衬底作底电极,测量显示直接生长于硅衬底上的PbTiO3多晶薄膜具有良好的铁电性能
关键词: 相似文献