全文获取类型
收费全文 | 147篇 |
免费 | 3篇 |
专业分类
化学 | 74篇 |
力学 | 9篇 |
数学 | 40篇 |
物理学 | 27篇 |
出版年
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2016年 | 4篇 |
2014年 | 2篇 |
2013年 | 8篇 |
2012年 | 6篇 |
2011年 | 2篇 |
2010年 | 5篇 |
2009年 | 4篇 |
2008年 | 8篇 |
2007年 | 4篇 |
2006年 | 10篇 |
2005年 | 5篇 |
2004年 | 4篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1988年 | 1篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 5篇 |
1976年 | 2篇 |
1974年 | 4篇 |
1973年 | 5篇 |
1972年 | 3篇 |
1971年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
1961年 | 1篇 |
1955年 | 5篇 |
1954年 | 4篇 |
1948年 | 2篇 |
1945年 | 2篇 |
1944年 | 11篇 |
1942年 | 1篇 |
1941年 | 4篇 |
1940年 | 7篇 |
1939年 | 2篇 |
1938年 | 4篇 |
1929年 | 1篇 |
排序方式: 共有150条查询结果,搜索用时 31 毫秒
91.
Saran Dayal Sagar Rohan Gaur Mulayam Singh 《Journal of Thermal Analysis and Calorimetry》2019,136(4):1687-1687
Journal of Thermal Analysis and Calorimetry - In the original publication of the article, Tables 1 and 2 were swapped. The correct versions are given below. The original article has been... 相似文献
92.
Shambhu N. Sharma 《Applied mathematics and computation》2010,216(7):1918-1922
The Volterra system is a non-linear system with the structure of the Volterra series. The Volterra series is attractive from the system-theoretic point of view, since it enables to obtain the output of a class of non-linear systems in terms of the input explicitly rather than involving input-output coupling terms and allows substantial simplifications for the numerical simulation. The Volterra system allows to derive the stability condition as well, i.e. obtain a bound on the output for a given bound on the input function, especially for the bilinear system. The bilinear system possesses the Volterra series. This paper derives the Volterra series formalism from the multi-linear system involving the coupling term attributed to (k-1)th order non-linearity and output function, where 1<k. The bilinear system becomes a special case of the non-linear problem of concern here. The Volterra series formalism of this paper is derived using the discrete counterpart of the phase space analysis for the non-linear non-autonomous system. The main result of the paper, i.e the Volterra series formalism of the multi-linear system of concern here, is somewhat more general, since the Volterra series representations for bilinear and tri-linear systems, etc. can be obtained as its special cases. 相似文献
93.
94.
95.
96.
Note on the boundary layer on a rotating sphere 总被引:1,自引:0,他引:1
Zusammenfassung Die gleichmässige Strömung in der Grenzschicht bei einer gleichmässig rotierenden Kugel wird behandelt. Die Grenzschicht entsteht an den Polen und entwickelt sich in beiden Hemisphären nach dem Äquator zu. An den Polen verhält sich die Kugel wie eine rotierende Scheibe, und Flüssigkeit strömt hier ein. Am Äquator verhält sich die Kugel wie ein rotierender Zylinder, und die Flüssigkeit strömt in dessen Bereich aus. 相似文献
97.
98.
Surface effects on quantum dot-based energy transfer 总被引:1,自引:0,他引:1
CdSe quantum dot (QD)-phthalocyanine (Pc) conjugates were prepared as energy transfer donor-acceptor pairs, and the efficiency of the energy transfer process in this system was investigated as a function of QD size and under different surface chemistry conditions. The kinetics and efficiency of the energy transfer process were studied by femtosecond time-resolved laser spectroscopy. We observed that the energy transfer efficiency does not follow a linear dependence on spectral overlap integrals as predicted by the F?rster theory for molecules. This observation is found to be due to the involvement of QD surface states in the energy transfer process from the photoexcited QDs to the molecular energy acceptor. 相似文献
99.
100.
Bishambhar Dayal Saksena Krishna Gopal Srivastava 《Proceedings Mathematical Sciences》1948,28(5):423-436
A method of calculating the piezo-electric constants of α-quartz is described which consists in determining the electric moment developed by changes of bond-lengths and bond-angles on strain. Considering three atoms P, Q, R, of which P and R are silicon atoms and Q an oxygen atom orvice-versa, the electric moment developed on strain may be resolved into moments in the plane PQR and moments perpendicular to this plane. Resolving these moments along the axes of the crystal and summing up for all the forty-two planes in the unit cell, we get the piezoelectric equations and constants of the crystal. The electric moment in the plane is equivalent to the moment produced by the change of bondlength along the direction of the bonds before strain, while for the moment normal to the plane we take the average value,i.e., half the value of the moment normal to the plane when the displacements of the atoms are wholly normal to the plane. The method gives good agreement with the observed values. 相似文献