全文获取类型
收费全文 | 772篇 |
免费 | 54篇 |
国内免费 | 4篇 |
专业分类
化学 | 574篇 |
力学 | 12篇 |
数学 | 103篇 |
物理学 | 141篇 |
出版年
2023年 | 9篇 |
2022年 | 10篇 |
2021年 | 9篇 |
2020年 | 18篇 |
2019年 | 22篇 |
2018年 | 8篇 |
2017年 | 12篇 |
2016年 | 38篇 |
2015年 | 31篇 |
2014年 | 27篇 |
2013年 | 45篇 |
2012年 | 40篇 |
2011年 | 70篇 |
2010年 | 38篇 |
2009年 | 42篇 |
2008年 | 49篇 |
2007年 | 24篇 |
2006年 | 40篇 |
2005年 | 31篇 |
2004年 | 35篇 |
2003年 | 20篇 |
2002年 | 19篇 |
2001年 | 13篇 |
2000年 | 15篇 |
1999年 | 11篇 |
1998年 | 7篇 |
1997年 | 6篇 |
1996年 | 9篇 |
1995年 | 5篇 |
1992年 | 5篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 3篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1980年 | 4篇 |
1978年 | 4篇 |
1977年 | 10篇 |
1976年 | 4篇 |
1975年 | 6篇 |
1969年 | 3篇 |
1934年 | 4篇 |
1927年 | 3篇 |
1926年 | 3篇 |
1925年 | 3篇 |
1924年 | 3篇 |
1923年 | 5篇 |
1899年 | 4篇 |
排序方式: 共有830条查询结果,搜索用时 15 毫秒
61.
62.
In this paper we describe the general forms of surjective isometries of the space of all probability distribution functions on R with respect to the Kolmogorov-Smirnov metric. 相似文献
63.
Recently Heyde, Kou and Peng [C.C. Heyde, S.G. Kou, X.H. Peng, What is a good external risk measure: Bridging the gaps between robustness, subadditivity, and insurance risk measures, 2007, preprint.] proposed the notion of a natural risk statistic associated with a finite sample that relaxes the subadditivity assumption in the classical coherent risk statistics. In this note we use convex analysis to provide alternate proofs of the representation results regarding natural risk statistics. 相似文献
64.
65.
Georg Gregor 《Monatshefte für Chemie / Chemical Monthly》1894,15(1):437-445
Ohne Zusammenfassung 相似文献
66.
Ingo Klimant Falk Ruckruh Gregor Liebsch Achim Stangelmayer Otto S. Wolfbeis 《Mikrochimica acta》1999,131(1-2):35-46
A new type of phenyl substituted ormosils as a matrix for oxygen-sensitive micro-optodes is described. The new ormosils combine
features of classical polymers such as solubility in organic solvents and those of sol–gel glasses such as mechanical stability
and a porous structure. They make possible a simple and fast fabrication of microsensors with reproducible properties. The
influence of the conditions during the polymerisation process (precursor composition and thermal treatment) on the sensing
properties has been studied in detail. Oxygen-sensitive films with ruthenium(II)–tris-(4,7-diphenyl-1,10-phenanthroline) and
platinum(II)–octaethylporphyrin as indicators were characterised with respect to their mechanical and photophysical properties.
Photostability, oxygen sensitivity, response behaviour and signal intensities of the sensing films and the micro-optodes were
examined. Micro-optodes based on the new sensing materials are fast responding, photostable and can be produced with a sufficient
batch to batch reproducibility. Compared to previously described oxygen micro-optodes, where polystyrene was used as immobilisation
matrix, the new sensors can be autoclaved and show favourable properties such as a faster response and a higher sensitivity.
They possess many potential applications in medical and biological research.
Received June 12, 1998. Revision December 10, 1998. 相似文献
67.
68.
69.
70.