全文获取类型
收费全文 | 26642篇 |
免费 | 625篇 |
国内免费 | 157篇 |
专业分类
化学 | 17873篇 |
晶体学 | 231篇 |
力学 | 658篇 |
综合类 | 1篇 |
数学 | 4453篇 |
物理学 | 4208篇 |
出版年
2021年 | 180篇 |
2020年 | 223篇 |
2019年 | 294篇 |
2018年 | 236篇 |
2017年 | 212篇 |
2016年 | 467篇 |
2015年 | 364篇 |
2014年 | 482篇 |
2013年 | 1341篇 |
2012年 | 1225篇 |
2011年 | 1541篇 |
2010年 | 804篇 |
2009年 | 660篇 |
2008年 | 1394篇 |
2007年 | 1452篇 |
2006年 | 1448篇 |
2005年 | 1442篇 |
2004年 | 1262篇 |
2003年 | 1060篇 |
2002年 | 1028篇 |
2001年 | 379篇 |
2000年 | 311篇 |
1999年 | 256篇 |
1998年 | 293篇 |
1997年 | 320篇 |
1996年 | 405篇 |
1995年 | 309篇 |
1994年 | 293篇 |
1993年 | 293篇 |
1992年 | 280篇 |
1991年 | 248篇 |
1990年 | 229篇 |
1989年 | 246篇 |
1988年 | 272篇 |
1987年 | 254篇 |
1986年 | 255篇 |
1985年 | 387篇 |
1984年 | 437篇 |
1983年 | 330篇 |
1982年 | 432篇 |
1981年 | 403篇 |
1980年 | 343篇 |
1979年 | 331篇 |
1978年 | 352篇 |
1977年 | 334篇 |
1976年 | 278篇 |
1975年 | 273篇 |
1974年 | 263篇 |
1973年 | 240篇 |
1972年 | 146篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Journal of Fluorescence - This report describes a combined immunofluorescence and fluorescence viability stain applied as one staining solution for rapid detection of live Legionella... 相似文献
2.
3.
Martin Kellert Jan-Simon Jeshua Friedrichs Nadine Anke Ullrich Alexander Feinhals Jonas Tepper Peter Lnnecke Evamarie Hey-Hawkins 《Molecules (Basel, Switzerland)》2021,26(7)
The development of novel, tumor-selective and boron-rich compounds as potential agents for use in boron neutron capture therapy (BNCT) represents a very important field in cancer treatment by radiation therapy. Here, we report the design and synthesis of two promising compounds that combine meta-carborane, a water-soluble monosaccharide and a linking unit, namely glycine or ethylenediamine, for facile coupling with various tumor-selective biomolecules bearing a free amino or carboxylic acid group. In this work, coupling experiments with two selected biomolecules, a coumarin derivative and folic acid, were included. The task of every component in this approach was carefully chosen: the carborane moiety supplies ten boron atoms, which is a tenfold increase in boron content compared to the l-boronophenylalanine (l-BPA) presently used in BNCT; the sugar moiety compensates for the hydrophobic character of the carborane; the linking unit, depending on the chosen biomolecule, acts as the connection between the tumor-selective component and the boron-rich moiety; and the respective tumor-selective biomolecule provides the necessary selectivity. This approach makes it possible to develop a modular and feasible strategy for the synthesis of readily obtainable boron-rich agents with optimized properties for potential applications in BNCT. 相似文献
4.
5.
Corina Andronescu Justus Masa Richard D. Tilley John J. Gooding Wolfgang Schuhmann 《Current Opinion in Electrochemistry》2021
The complex interplay of restricted mass transport leading to local accumulation or depletion of educts, intermediates, products, counterions and co-ions influences the reactions at the active sites of electrocatalysts when electrodes are rough, three-dimensionally mesoporous or nanoporous. This influence is important with regard to activity, and even more to selectivity, of electrocatalytic reactions. The underlying principles are discussed based on the growing awareness of these considerations over recent years. 相似文献
6.
7.
8.
Algebras and Representation Theory - We would like to correct two errors in our paper Involutions of type G2 over a field of characteristic 2 [2]. 相似文献
9.
10.
A set of exact conditions is compiled for the purpose of developing and testing approximations for the exchange-correlation energy as a functional of the electron density. Special emphasis is placed upon recently developed density-scaling relationships. Commonly used generalized gradient approximations are compared against several of these conditions. A direct tabular comparison of these functionals (not of calculated properties) with one another is also made. © 1994 John Wiley & Sons, Inc. 相似文献