全文获取类型
收费全文 | 46495篇 |
免费 | 753篇 |
国内免费 | 245篇 |
专业分类
化学 | 27848篇 |
晶体学 | 629篇 |
力学 | 1255篇 |
综合类 | 8篇 |
数学 | 6112篇 |
物理学 | 11641篇 |
出版年
2020年 | 326篇 |
2019年 | 411篇 |
2018年 | 372篇 |
2017年 | 362篇 |
2016年 | 683篇 |
2015年 | 510篇 |
2014年 | 722篇 |
2013年 | 2159篇 |
2012年 | 1763篇 |
2011年 | 2142篇 |
2010年 | 1239篇 |
2009年 | 1091篇 |
2008年 | 1987篇 |
2007年 | 2087篇 |
2006年 | 2043篇 |
2005年 | 1990篇 |
2004年 | 1735篇 |
2003年 | 1512篇 |
2002年 | 1480篇 |
2001年 | 1058篇 |
2000年 | 807篇 |
1999年 | 674篇 |
1998年 | 634篇 |
1997年 | 644篇 |
1996年 | 696篇 |
1995年 | 678篇 |
1994年 | 631篇 |
1993年 | 603篇 |
1992年 | 619篇 |
1991年 | 626篇 |
1990年 | 586篇 |
1989年 | 604篇 |
1988年 | 602篇 |
1987年 | 584篇 |
1986年 | 572篇 |
1985年 | 790篇 |
1984年 | 860篇 |
1983年 | 638篇 |
1982年 | 753篇 |
1981年 | 752篇 |
1980年 | 663篇 |
1979年 | 665篇 |
1978年 | 682篇 |
1977年 | 645篇 |
1976年 | 606篇 |
1975年 | 560篇 |
1974年 | 543篇 |
1973年 | 538篇 |
1967年 | 395篇 |
1966年 | 338篇 |
排序方式: 共有10000条查询结果,搜索用时 31 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.
Filatova S. M. Guseva M. K. Bodrova T. G. Parshina D. V. Budanova U. A. Sebyakin Yu. L. 《Russian Journal of General Chemistry》2022,91(1):S13-S23
Russian Journal of General Chemistry - The review article traces the main trends of the synthetic approach to the solution of the problem of overcoming the resistance of pathogenic bacterial... 相似文献
3.
4.
The health monitoring has been studied to ensure integrity of design of engine structure by detection, quantification, and prediction of damages. Early detection of faults may allow the downtime of maintenance to be rescheduled, thus preventing sudden shutdown of machines. In cylinder pressure developed, vibrations and noise emissions data provide a rich source of information about condition of engines. Monitoring of vibrations and noise emissions are novel non-intrusive methodologies for which positioning of various transducers are important issue. The presented work shows applicability of these diagnosis methodologies adopted in case of diesel engines. The effects of changing various fuel injection parameters was analyzed. Scope of using non-intrusive technique has been analyzed by changing locations of microphone. Novelty of this worklies in exploring signal processing methods for various locations around the engine test set up. Various frequency ranges of contributing noise and vibration sources were identified. Time-Frequency analysis showed the onset of various cyclic. Based on the identification of various frequency bands, it is possible to device suitable filters in order to extract more information. 相似文献
5.
6.
7.
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
8.
9.
10.