全文获取类型
收费全文 | 10962篇 |
免费 | 326篇 |
国内免费 | 32篇 |
专业分类
化学 | 7078篇 |
晶体学 | 48篇 |
力学 | 426篇 |
数学 | 1614篇 |
物理学 | 2154篇 |
出版年
2023年 | 49篇 |
2022年 | 111篇 |
2021年 | 125篇 |
2020年 | 140篇 |
2019年 | 149篇 |
2018年 | 156篇 |
2017年 | 128篇 |
2016年 | 265篇 |
2015年 | 292篇 |
2014年 | 304篇 |
2013年 | 587篇 |
2012年 | 709篇 |
2011年 | 764篇 |
2010年 | 458篇 |
2009年 | 382篇 |
2008年 | 659篇 |
2007年 | 630篇 |
2006年 | 615篇 |
2005年 | 587篇 |
2004年 | 506篇 |
2003年 | 470篇 |
2002年 | 405篇 |
2001年 | 200篇 |
2000年 | 218篇 |
1999年 | 112篇 |
1998年 | 154篇 |
1997年 | 136篇 |
1996年 | 155篇 |
1995年 | 92篇 |
1994年 | 112篇 |
1993年 | 97篇 |
1992年 | 86篇 |
1991年 | 58篇 |
1990年 | 63篇 |
1989年 | 51篇 |
1988年 | 67篇 |
1987年 | 40篇 |
1986年 | 44篇 |
1985年 | 82篇 |
1984年 | 86篇 |
1983年 | 51篇 |
1982年 | 55篇 |
1981年 | 69篇 |
1980年 | 69篇 |
1979年 | 63篇 |
1978年 | 67篇 |
1977年 | 57篇 |
1976年 | 76篇 |
1975年 | 49篇 |
1973年 | 37篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Queueing Systems - We study a quantum switch that distributes tripartite entangled states to sets of users. The entanglement switching process requires two steps: First, each user attempts to... 相似文献
2.
Florence Drui Emmanuel Franck Philippe Helluy Laurent Navoret 《Comptes Rendus Mecanique》2019,347(3):259-269
The over-relaxation approach is an alternative to the Jin–Xin relaxation method in order to apply the equilibrium source term in a more precise way. This is also a key ingredient of the lattice Boltzmann method for achieving second-order accuracy. In this work, we provide an analysis of the over-relaxation kinetic scheme. We compute its equivalent equation, which is particularly useful for devising stable boundary conditions for the hidden kinetic variables. 相似文献
3.
4.
5.
6.
7.
Photoisomerisation in Aminoazobenzene‐Substituted Ruthenium(II) Tris(bipyridine) Complexes: Influence of the Conjugation Pathway
下载免费PDF全文
![点击此处可从《Chemistry (Weinheim an der Bergstrasse, Germany)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Dr. Anissa Amar Dr. Paul Savel Dr. Huriye Akdas‐Kilig Dr. Claudine Katan Prof. Hacène Meghezzi Prof. Abdou Boucekkine Dr. Jean‐Pierre Malval Dr. Jean‐Luc Fillaut 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(22):8262-8270
Transition‐metal complexes containing stimuli‐responsive systems are attractive for applications in optical devices, photonic memory, photosensing, as well as luminescence imaging. Amongst them, photochromic metal complexes offer the possibility of combining the specific properties of the metal centre and the optical response of the photochromic group. The synthesis, the electrochemical properties and the photophysical characterisation of a series of donor–acceptor azobenzene derivatives that possess bipyridine groups connected to a 4‐dialkylaminoazobenzene moiety through various linkers are presented. DFT and TD‐DFT calculations were performed to complement the experimental findings and contribute to their interpretation. The position and nature of the linker (ethynyl, triazolyl, none) were engineered and shown to induce different electronic coupling between donor and acceptor in ligands and complexes. This in turn led to strong modulations in terms of photoisomerisation of the ligands and complexes. 相似文献
8.
Lotfi Boudjema Dr. Jérôme Long Dr. Fabrice Salles Prof. Joulia Larionova Dr. Yannick Guari Prof. Philippe Trens 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(2):479-484
Porous coordination polymers are molecule-based materials presenting a high degree of tunability, which offer many advantages for targeted applications over conventional inorganic materials. This work demonstrates that the hydrophilic/hydrophobic character of Prussian blue analogues having a lipophilic feature may be tuned to optimize the gas adsorption properties. The role of the coordinatively unsaturated metal sites is emphasized through a combination of theoretical and experimental study of water, ethanol, and n-hexane adsorption. 相似文献
9.
Markus Bödenler Ludovic de Rochefort P. James Ross Nicolas Chanet Geneviève Guillot Gareth R. Davies 《Molecular physics》2019,117(7-8):832-848
ABSTRACTFast field-cycling (FFC) nuclear magnetic resonance relaxometry is a well-established method to determine the relaxation rates as a function of magnetic field strength. This so-called nuclear magnetic relaxation dispersion gives insight into the underlying molecular dynamics of a wide range of complex systems and has gained interest especially in the characterisation of biological tissues and diseases. The combination of FFC techniques with magnetic resonance imaging (MRI) offers a high potential for new types of image contrast more specific to pathological molecular dynamics. This article reviews the progress in FFC-MRI over the last decade and gives an overview of the hardware systems currently in operation. We discuss limitations and error correction strategies specific to FFC-MRI such as field stability and homogeneity, signal-to-noise ratio, eddy currents and acquisition time. We also report potential applications with impact in biology and medicine. Finally, we discuss the challenges and future applications in transferring the underlying molecular dynamics into novel types of image contrast by exploiting the dispersive properties of biological tissue or MRI contrast agents. 相似文献
10.