全文获取类型
收费全文 | 27924篇 |
免费 | 639篇 |
国内免费 | 163篇 |
专业分类
化学 | 18534篇 |
晶体学 | 222篇 |
力学 | 704篇 |
综合类 | 1篇 |
数学 | 4639篇 |
物理学 | 4626篇 |
出版年
2021年 | 177篇 |
2020年 | 246篇 |
2019年 | 323篇 |
2018年 | 264篇 |
2017年 | 235篇 |
2016年 | 495篇 |
2015年 | 377篇 |
2014年 | 492篇 |
2013年 | 1451篇 |
2012年 | 1279篇 |
2011年 | 1617篇 |
2010年 | 842篇 |
2009年 | 678篇 |
2008年 | 1429篇 |
2007年 | 1491篇 |
2006年 | 1475篇 |
2005年 | 1462篇 |
2004年 | 1294篇 |
2003年 | 1082篇 |
2002年 | 1053篇 |
2001年 | 412篇 |
2000年 | 335篇 |
1999年 | 266篇 |
1998年 | 308篇 |
1997年 | 330篇 |
1996年 | 416篇 |
1995年 | 317篇 |
1994年 | 326篇 |
1993年 | 309篇 |
1992年 | 310篇 |
1991年 | 260篇 |
1990年 | 262篇 |
1989年 | 264篇 |
1988年 | 284篇 |
1987年 | 267篇 |
1986年 | 267篇 |
1985年 | 409篇 |
1984年 | 469篇 |
1983年 | 347篇 |
1982年 | 455篇 |
1981年 | 425篇 |
1980年 | 356篇 |
1979年 | 360篇 |
1978年 | 382篇 |
1977年 | 357篇 |
1976年 | 293篇 |
1975年 | 290篇 |
1974年 | 278篇 |
1973年 | 262篇 |
1972年 | 157篇 |
排序方式: 共有10000条查询结果,搜索用时 62 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.
4.
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
5.
6.
7.
8.
Sung Hwan Koo Dong Jun Li Taeyeong Yun Dong Sung Choi Kyung Eun Lee Gil Yong Lee Youngtak Oh Joonwon Lim Suchithra Padmajan Sasikala Ho Jin Lee In Ho Kim Hong Ju Jung Rishabh Jain Sang Ouk Kim 《Particle & Particle Systems Characterization》2019,36(7)
Efficient water electrolysis catalyst is highly demanded for the production of hydrogen as a sustainable energy fuel. It is reported that cobalt derived nanoparticle (CoS2, CoP, CoS|P) decorated reduced graphene oxide (rGO) composite aerogel catalysts for highly active and reliable hydrogen evolution reaction electrocatalysts. 7 nm level cobalt derived nanoparticles are synthesized over graphene aerogel surfaces with excellent surface coverage and maximal expose of active sites. CoS|P/rGO hybrid aerogel composites show an excellent catalytic activity with overpotential of ≈169 mV at a current density of ≈10 mA cm?2. Accordingly, efficient charge transfer is attained with Tafel slope of ≈52 mV dec?1 and a charge transfer resistance (Rct) of ≈12 Ω. This work suggests a viable route toward ultrasmall, uniform nanoparticles decorated graphene surfaces with well‐controlled chemical compositions, which can be generally useful for various applications commonly requiring large exposure of active surface area as well as robust interparticle charger transfer. 相似文献
9.
Physics of the Solid State - Temporal instability of acoustic wave is investigated in an infinite semiconductor plasma using classical hydrodynamic approach. We consider a homogeneous semiconductor... 相似文献
10.
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