全文获取类型
收费全文 | 679975篇 |
免费 | 5619篇 |
国内免费 | 1843篇 |
专业分类
化学 | 327598篇 |
晶体学 | 9390篇 |
力学 | 37775篇 |
综合类 | 24篇 |
数学 | 111689篇 |
物理学 | 200961篇 |
出版年
2021年 | 5618篇 |
2020年 | 6102篇 |
2019年 | 6969篇 |
2018年 | 19126篇 |
2017年 | 18995篇 |
2016年 | 18634篇 |
2015年 | 7695篇 |
2014年 | 12027篇 |
2013年 | 26831篇 |
2012年 | 24031篇 |
2011年 | 34173篇 |
2010年 | 23777篇 |
2009年 | 24211篇 |
2008年 | 29352篇 |
2007年 | 31084篇 |
2006年 | 21217篇 |
2005年 | 19933篇 |
2004年 | 18970篇 |
2003年 | 17720篇 |
2002年 | 16791篇 |
2001年 | 17294篇 |
2000年 | 13378篇 |
1999年 | 10261篇 |
1998年 | 8985篇 |
1997年 | 8771篇 |
1996年 | 8237篇 |
1995年 | 7402篇 |
1994年 | 7320篇 |
1993年 | 7148篇 |
1992年 | 7483篇 |
1991年 | 8088篇 |
1990年 | 7710篇 |
1989年 | 7683篇 |
1988年 | 7445篇 |
1987年 | 7260篇 |
1986年 | 6941篇 |
1985年 | 8841篇 |
1984年 | 9150篇 |
1983年 | 7753篇 |
1982年 | 8041篇 |
1981年 | 7548篇 |
1980年 | 7117篇 |
1979年 | 7775篇 |
1978年 | 8077篇 |
1977年 | 7988篇 |
1976年 | 7974篇 |
1975年 | 7649篇 |
1974年 | 7438篇 |
1973年 | 7809篇 |
1972年 | 5823篇 |
排序方式: 共有10000条查询结果,搜索用时 953 毫秒
991.
S. B. Ellis S. J. Kiehl W. S. Hughes K. Schwabe W. C. Gardiner H. L. Sanders H. Yoshimura Hanna Jablezynska-Jedrzewska J. Domański W. A. Dorfman P. Nylén Barbara Stone F. Hovorka W. C. Dearing E. Biilmann W. Kordatzki P. Wulff G. Florence A. Drilhon P. Szigeti O. Tomiček F. Poupě O. Redlich W. Stricks 《Analytical and bioanalytical chemistry》1937,111(2-4):94-104
992.
J. B. Lewis E. L. Baldeschwieler L. D. Tabern E. F. Shelberg D. Hillis S. Cromer I. F. Bingham S. Givaudon M. Aubert M. R. Moutte A. Andant P. Lambert J. Lecomte J. Tausz H. Wolf B. Gordon W. Dachnow I. Perrier M. Lobunetz M. O. Chaikin C. Engler D. Holde 《Analytical and bioanalytical chemistry》1940,119(7-8):307-310
993.
994.
A. Ascoli 《Colloid and polymer science》1912,11(1):45-45
Ohne Zusammenfassung 相似文献
995.
A. Schwenke 《Fresenius' Journal of Analytical Chemistry》1930,80(1-2):67-81
Ohne Zusammenfassung 相似文献
996.
P. A. Levene und F. W. Bieber 《Fresenius' Journal of Analytical Chemistry》1922,61(12):476-477
Ohne Zusammenfassung 相似文献
997.
998.
E. L. Kristallovich A. G. Eshimbetov N. D. Chuvylkin L. I. Belen'kii Kh. M. Shakhidoyatov 《Chemistry of Natural Compounds》2003,39(5):495-500
The principal types of electronic transitions in absorption spectra of deoxyvasicinone and its 6-amino- and 6-nitro-derivatives were determined by analyzing the electron-density distributions in excited states calculated using ZINDO/S. 相似文献
999.
Non-isothermal short-range-order kinetics of binary alloys as influenced by solute-vacancy complexes
A model describing the roles of bound and unbound vacancies is proposed in order to predict defect decay and short-range-order
kinetics of quenched binary alloys during linear heating experiments. This is an alternative treatment of a previous approach.
The model has been applied to the differential scanning calorimetry (DSC) curves of Cu-5 at.% Zn quenched from different temperatures.
An expression to calculate the activation energy for migration of solute-vacancy complexes was also developed which make use
of DSC trace data. A value of 89.12±0.32 kJ mol-1 was obtained for the above alloy. The relative contribution of bound and unbound vacancies to partition of effective activation
energy corresponding to the ordering process as influenced by quenching temperature was also assessed.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
1000.
Chris Hope 《The Journal of the Operational Research Society》2003,54(11):1167-1176
What strategy should a football (soccer, in American parlance) club adopt when deciding whether to sack its manager? This paper introduces a simple model assuming that a club's objective is to maximize the number of league points that it scores per season. The club's strategy consists of three choices: the length of the honeymoon period during which it will not consider sacking a new manager, the level of the performance trapdoor below which the manager get the sack, and the weight that it will give to more recent games compared to earlier ones. Some data from the last six seasons of the English Premiership are used to calibrate the model. At this early stage of the research, the best strategy appears to have only a short honeymoon period of eight games (much less than the actual shortest period of 12 games), to set the trapdoor at 0.74 points per game, and to put 47% of the weight on the last five games. A club adopting this strategy would obtain on average 56.8 points per season, compared to a Premiership average of 51.8 points. 相似文献