全文获取类型
收费全文 | 3657篇 |
免费 | 70篇 |
国内免费 | 17篇 |
专业分类
化学 | 2234篇 |
晶体学 | 23篇 |
力学 | 75篇 |
数学 | 596篇 |
物理学 | 816篇 |
出版年
2021年 | 34篇 |
2020年 | 58篇 |
2019年 | 42篇 |
2018年 | 25篇 |
2017年 | 22篇 |
2016年 | 45篇 |
2015年 | 51篇 |
2014年 | 47篇 |
2013年 | 164篇 |
2012年 | 162篇 |
2011年 | 179篇 |
2010年 | 99篇 |
2009年 | 87篇 |
2008年 | 153篇 |
2007年 | 189篇 |
2006年 | 177篇 |
2005年 | 173篇 |
2004年 | 168篇 |
2003年 | 133篇 |
2002年 | 112篇 |
2001年 | 75篇 |
2000年 | 92篇 |
1999年 | 53篇 |
1998年 | 55篇 |
1997年 | 52篇 |
1996年 | 56篇 |
1995年 | 61篇 |
1994年 | 50篇 |
1993年 | 67篇 |
1992年 | 44篇 |
1991年 | 40篇 |
1990年 | 44篇 |
1989年 | 44篇 |
1988年 | 37篇 |
1987年 | 42篇 |
1986年 | 41篇 |
1985年 | 57篇 |
1984年 | 46篇 |
1983年 | 38篇 |
1982年 | 34篇 |
1981年 | 38篇 |
1980年 | 36篇 |
1979年 | 26篇 |
1978年 | 30篇 |
1977年 | 39篇 |
1976年 | 45篇 |
1975年 | 49篇 |
1974年 | 41篇 |
1973年 | 45篇 |
1972年 | 18篇 |
排序方式: 共有3744条查询结果,搜索用时 249 毫秒
1.
Dr. Jun Wang Jaeyoung Heo Dr. Changqiang Chen Dr. Andrew J. Wilson Prof. Prashant K. Jain 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(42):18588-18592
We study how visible light influences the activity of an electrocatalyst composed of Au and Pt nanoparticles. The bimetallic composition imparts a dual functionality: the Pt component catalyzes the electrochemical oxidation of ammonia to liberate hydrogen and the Au component absorbs visible light by the excitation of localized surface plasmon resonances. Under visible-light excitation, this catalyst exhibits enhanced electrochemical ammonia oxidation kinetics, outperforming previously reported electrochemical schemes. We trace the enhancement to a photochemical potential resulting from electron–hole carriers generated in the electrocatalyst by plasmonic excitation. The photopotential responsible for enhanced kinetics scales linearly with the light intensity—a general design principle for eliciting superlative photoelectrochemical performance from catalysts comprised of plasmonic metals or hybrids. We also determine a photochemical conversion coefficient. 相似文献
2.
3.
4.
Bobby Wilson 《偏微分方程通讯》2015,40(8):1521-1542
This article explores the questions of long time orbital stability in high order Sobolev norms of plane wave solutions to the NLSE in the defocusing case. 相似文献
5.
6.
Adam I. Green Dr. Fruzsina Hobor Dr. Christopher P. Tinworth Dr. Stuart Warriner Prof. Andrew J. Wilson Prof. Adam Nelson 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(47):10682-10689
Protein–protein interactions (PPIs) provide a rich source of potential targets for drug discovery and biomedical science research. However, the identification of structural-diverse starting points for discovery of PPI inhibitors remains a significant challenge. Activity-directed synthesis (ADS), a function-driven discovery approach, was harnessed in the discovery of the p53/hDM2 PPI. Over two rounds of ADS, 346 microscale reactions were performed, with prioritisation on the basis of the activity of the resulting product mixtures. Four distinct and novel series of PPI inhibitors were discovered that, through biophysical characterisation, were shown to have promising ligand efficiencies. It was thus shown that ADS can facilitate ligand discovery for a target that does not have a defined small-molecule binding site, and can provide distinctive starting points for the discovery of PPI inhibitors. 相似文献
7.
8.
Domain-based local pair natural orbital methods within the correlation consistent composite approach
Ab initio composite approaches have been utilized to model and predict main group thermochemistry within 1 kcal mol−1, on average, from well-established reliable experiments, primarily for molecules with less than 30 atoms. For molecules of increasing size and complexity, such as biomolecular complexes, composite methodologies have been limited in their application. Therefore, the domain-based local pair natural orbital (DLPNO) methods have been implemented within the correlation consistent composite approach (ccCA) framework, namely DLPNO-ccCA, to reduce the computational cost (disk space, CPU (central processing unit) time, memory) and predict energetic properties such as enthalpies of formation, noncovalent interactions, and conformation energies for organic biomolecular complexes including one of the largest molecules examined via composite strategies, within 1 kcal mol−1, after calibration with 119 molecules and a set of linear alkanes. © 2019 Wiley Periodicals, Inc. 相似文献
9.
10.
Chromatographia - Drug scheduling has directed the testing approaches for forensic laboratories since the 1970s when Cannabis (marijuana and hemp) and its psychoactive constituent,... 相似文献