全文获取类型
收费全文 | 764篇 |
免费 | 18篇 |
专业分类
化学 | 376篇 |
晶体学 | 3篇 |
力学 | 5篇 |
数学 | 36篇 |
物理学 | 362篇 |
出版年
2019年 | 4篇 |
2018年 | 4篇 |
2016年 | 7篇 |
2015年 | 5篇 |
2014年 | 13篇 |
2013年 | 30篇 |
2012年 | 27篇 |
2011年 | 35篇 |
2010年 | 21篇 |
2009年 | 16篇 |
2008年 | 55篇 |
2007年 | 52篇 |
2006年 | 53篇 |
2005年 | 57篇 |
2004年 | 64篇 |
2003年 | 37篇 |
2002年 | 40篇 |
2001年 | 22篇 |
2000年 | 22篇 |
1999年 | 17篇 |
1998年 | 6篇 |
1997年 | 5篇 |
1996年 | 13篇 |
1995年 | 8篇 |
1994年 | 13篇 |
1993年 | 4篇 |
1992年 | 8篇 |
1991年 | 4篇 |
1990年 | 12篇 |
1989年 | 9篇 |
1988年 | 5篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1984年 | 8篇 |
1982年 | 7篇 |
1981年 | 6篇 |
1980年 | 7篇 |
1979年 | 5篇 |
1978年 | 6篇 |
1977年 | 3篇 |
1976年 | 6篇 |
1975年 | 3篇 |
1974年 | 3篇 |
1973年 | 6篇 |
1972年 | 5篇 |
1936年 | 3篇 |
1905年 | 2篇 |
1890年 | 2篇 |
1882年 | 3篇 |
1879年 | 2篇 |
排序方式: 共有782条查询结果,搜索用时 15 毫秒
1.
Hansen Karin Vels Kreka Kosova Jacobsen Torben 《Journal of Solid State Electrochemistry》2019,23(3):811-822
Journal of Solid State Electrochemistry - Local cathodic polarizations of yttria-stabilized zirconia were carried out with a PtIr probe as the working electrode in a controlled atmosphere high... 相似文献
2.
3.
Soderstrom E McKenna JA Abrams GS Adolphsen CE Averill D Ballam J Barish BC Barklow T Barnett BA Bartelt J Bethke S Blockus D Bonvicini G Boyarski A Brabson B Breakstone A Bulos F Burchat PR Burke DL Cence RJ Chapman J Chmeissani M Cords D Coupal DP Dauncey P DeStaebler HC Dorfan DE Dorfan JM Drewer DC Elia R Feldman GJ Fernandes D Field RC Ford WT Fordham C Frey R Fujino D Gan KK Gero E Gidal G Glanzman T Goldhaber G Gomez Cadenas JJ Gratta G Grindhammer G Grosse-Wiesmann P Hanson G Harr R 《Physical review letters》1990,64(25):2980-2983
4.
Komamiya S Abrams GS Adolphsen CE Averill D Ballam J Barish BC Barklow T Barnett BA Bartelt J Bethke S Blockus D Bonvicini G Boyarski A Brabson B Breakstone A Bulos F Burchat PR Burke DL Cence RJ Chapman J Chmeissani M Cords D Coupal DP Dauncey P DeStaebler HC Dorfan DE Dorfan JM Drewer DC Elia R Feldman GJ Fernandes D Field RC Ford WT Fordham C Frey R Fujino D Gan KK Gatto C Gero E Gidal G Glanzman T Goldhaber G Gomez Cadenas JJ Gratta G Grindhammer G Grosse-Wiesmann P Hanson G Harr R 《Physical review letters》1990,64(24):2881-2884
5.
6.
Chemical and physical analyses of malt, the main ingredient of beer, have been used to predict the concentration of certain volatile compounds in the finished beer.The prediction was done by means of the partial least squares regression (PLS2) in SIMCA. The total data set as well as individual malt clusters were submitted to PLS analysis. Best prediction was obtained by separating the total object matrix in classes according to similarity found by fuzzy pattern recognition (FCV). FCV was also used to separate the beer variables in classes and to select the subset of variables to be predicted.A joint approach of fuzzy pattern recognition to identify groups of samples and SIMCA-PLS2 to predict several dependent variables is suggested as a powerful tool in process-analytical chemistry. 相似文献
7.
The development and application of a rocket immunoelectrophoretic and an enzyme activity electrophoretic assay for the qualitative analysis of Geotrichum candidum lipase activity is presented. The sensitivities of the four assays were (in arbitrary units): enzyme activity electrophoresis, 1-0.5; rocket immunoelectrophoresis, 0.5-0.2; radial diffusion, 1; titrimetry, 1. The electrophoretic methods made it possible to distinguish between high and low molecular weight forms of the G. candidum lipases. The enzyme activity electrophoretic methods can be combined with other electrophoretic techniques, as demonstrated here with isoelectric focusing, and produce useful information on physico-chemical differences between different molecular forms of the lipase, e.g. forms with different pI. 相似文献
8.
Differential pulse polarograms of surfactants exhibit tensammetric peaks at the adsorption and desorption potentials of the surfactant. In the potential range where adsorption occurs the base current is depressed. The heights of the tensammetric peaks are nonlinear functions of the bulk concentration of the surfactant. Differential pulse polarograms of reducible substances are greatly affected by the presence of surfactants, the effect being similar to that observed in a.c. polarography. Surfactants with the same charge as the depolarizer act as electrochemical masking agents, whereas peak currents may be enhanced by oppositely charged surfactants. 相似文献
9.
The enantioselective cyclization of N-acyliminium ions generated in situ from tryptamine is promoted with high enantioselectivity by a new chiral thiourea catalyst. This represents the first successful system for asymmetric catalysis of the Pictet-Spengler reaction. 相似文献
10.