全文获取类型
收费全文 | 1492篇 |
免费 | 556篇 |
国内免费 | 266篇 |
专业分类
化学 | 287篇 |
晶体学 | 10篇 |
力学 | 337篇 |
综合类 | 73篇 |
数学 | 524篇 |
物理学 | 1083篇 |
出版年
2024年 | 12篇 |
2023年 | 33篇 |
2022年 | 47篇 |
2021年 | 40篇 |
2020年 | 36篇 |
2019年 | 31篇 |
2018年 | 20篇 |
2017年 | 52篇 |
2016年 | 50篇 |
2015年 | 70篇 |
2014年 | 148篇 |
2013年 | 126篇 |
2012年 | 92篇 |
2011年 | 124篇 |
2010年 | 118篇 |
2009年 | 107篇 |
2008年 | 218篇 |
2007年 | 184篇 |
2006年 | 64篇 |
2005年 | 119篇 |
2004年 | 87篇 |
2003年 | 76篇 |
2002年 | 61篇 |
2001年 | 67篇 |
2000年 | 34篇 |
1999年 | 34篇 |
1998年 | 40篇 |
1997年 | 39篇 |
1996年 | 32篇 |
1995年 | 32篇 |
1994年 | 27篇 |
1993年 | 12篇 |
1992年 | 28篇 |
1991年 | 18篇 |
1990年 | 16篇 |
1989年 | 9篇 |
1988年 | 2篇 |
1987年 | 5篇 |
1985年 | 4篇 |
排序方式: 共有2314条查询结果,搜索用时 15 毫秒
1.
Geng Sheng WANG 《数学学报(英文版)》2005,21(5):1005-1014
This work is concerned with Pontryagin's maximum principle of optimal control problems governed by some non-well-posed semilinear heat equations. A type of approach to the non-well-posed optimal control problem is given. 相似文献
2.
如果放在光滑桌面上的物体只受一只弹簧的作用,那么物体所作的运动是简揩运动.简谐运动是一种最简单的基本运动,它的动力学特点是物体所受合力满足F=-kx,该力叫回复力.简谐运动的特点是具有周期性,周期T=2π√m/k,其中m是振动物体质量,k是回复力 相似文献
3.
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
4.
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
5.
6.
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
7.
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
8.
Quantum State Transfer between Two Distant Atoms by Connecting Two Cavities via Optical Fibres
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)
A scheme is proposed to unconditionally implement state transfer between two distant atoms by sending the atoms across two distant cavities connected via an optical fibre, respectively. The field state, which preserves the information about the first atom, is transmitted from one cavity to the other along the fibre. A Faraday rotator integrated in the fibre can be designed to completely stop the fields reflected from the second cavity, thus after the field interacts with the second atom for a defined time, the state transfer can be accomplished with unit efficiency. 相似文献
9.
提出一种利用 GHZ态实现多原子缠结态的量子隐形传态方案 .当作为量子通道的 GHZ态含有一个单模高 Q腔时 ,大大地简化了量子稳形传态中的联合测量过程 相似文献
10.
We present a scheme for perfectly teleporting an arbitrary and unknown N-particle GHZ-class state from a sender to a receiver. We just need one quantum channel composed of two or three particles in the maximally entangled state. The sender performs one Bell-state measurement on two of her particles and N - 1 Hadamard operations and N - 1 yon Neumann measurements on the rest N - 1 particles. The receiver adopts one corresponding unitary transformation on his particles shared with the sender. After that, the receiver can obtain the original N-particle GHZ-class state by introducing N - 1 ancillary particles and carrying out N - 1 controlled-NOT operations. We also generalize the scheme to the case of controlled teleportation. 相似文献