全文获取类型
收费全文 | 248篇 |
免费 | 1篇 |
专业分类
化学 | 117篇 |
晶体学 | 1篇 |
力学 | 3篇 |
数学 | 42篇 |
物理学 | 86篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 1篇 |
2018年 | 4篇 |
2017年 | 1篇 |
2016年 | 6篇 |
2015年 | 3篇 |
2014年 | 3篇 |
2013年 | 12篇 |
2012年 | 11篇 |
2011年 | 8篇 |
2010年 | 13篇 |
2009年 | 7篇 |
2008年 | 20篇 |
2007年 | 13篇 |
2006年 | 18篇 |
2005年 | 13篇 |
2004年 | 10篇 |
2003年 | 7篇 |
2002年 | 4篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1995年 | 8篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1992年 | 5篇 |
1991年 | 2篇 |
1990年 | 6篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 6篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1976年 | 2篇 |
1974年 | 3篇 |
1966年 | 1篇 |
1955年 | 3篇 |
1954年 | 3篇 |
1935年 | 2篇 |
1903年 | 1篇 |
排序方式: 共有249条查询结果,搜索用时 31 毫秒
21.
Monika Sinha Manjari Bagchi Jishnu Dey Mira Dey Subharthi Ray Siddhartha Bhowmick 《Physics letters. [Part B]》2004,590(3-4):120-125
Strange stars (ReSS) calculated from a realistic equation of state (EOS), that incorporate chiral symmetry restoration as well as deconfinement at high density [Phys. Lett. B 438 (1998) 123; Phys. Lett. B 447 (1999) 352, Addendum; Phys. Lett. B 467 (1999) 303, Erratum; Indian J. Phys. B 73 (1999) 377] show compact objects in the mass radius curve. We compare our calculations of incompressibility for this EOS with that of nuclear matter. One of the nuclear matter EOS has a continuous transition to ud-matter at about five times normal density. Another nuclear matter EOS incorporates density dependent coupling constants. From a look at the consequent velocity of sound, it is found that the transition to ud-matter seems necessary. 相似文献
22.
In this article we present a new, general but simple, microscopic expression for time-dependent solvation energy of an ion.
This expression is surprisingly similar to the expression for the time-dependent dielectric friction on a moving ion. We show
that both the Chandra-Bagchi and the Fried-Mukamel formulations of solvation dynamics can be easily derived from this expression.
This expression leads to an almost perfect agreement of the theory with all the available computer simulation results. Second,
we show here for the first time that the mobility of a light solute ion can significantly accelerate its own solvation, specially
in the underdamped limit. The latter result is also in excellent agreement with the computer simulations. 相似文献
23.
Biman Bagchi 《Journal of Chemical Sciences》1987,99(4):243-252
The canonical average of the Boltzmann factor of the interaction potential, as measured by a test particle, is shown to be
equal to the inverse of the fraction of the average number
of 1-particle Mayer clusters. The potential distribution theory is used to derive an analytic expression for a mean number
of small clusters
1≤n<N, in anN-particle system) in the mean-field expression. Near the spinodal density, the average number of small clusters undergo a
sharp change. Computation of pressure shows that only the first four clusters produce surprisingly good agreement with known
pressure even beyond the spinodal density.
Contribution No. 439 from the Solid State and Structural Chemistry Unit 相似文献
24.
Stochastic diffusion equations with unknown boundary conditions are encountered in practice whenever the boundary is observed only through measurement errors. Parameter identification for such systems is studied in the present paper. The boundary condition is treated as an unknown parameter in a function space as an intermediate step in solving the identification problem. 相似文献
25.
The intent of this review is to utilize the mechanics of thin films in order to define quantitative procedures for predicting interface decohesion motivated by residual stress. The emphasis is on the role of the interface debond energy, especially methods for measuring this parameter in an accurate and reliable manner. Experimental results for metal films on dielectric substrates are reviewed and possible mechanisms are discussed. 相似文献
26.
27.
We discuss in detail the parasupersymmetric quantum mechanics of arbitrary order where the parasupersymmetry is between the
normal bosons and those corresponding to the truncated harmonic oscillator. We show that even though the parasusy algebra
is different from that of the usual parasusy quantum mechanics, still the consequences of the two are identical. We further
show that the parasupersymmetric quantum mechanics of arbitrary orderp can also be rewritten in terms ofp supercharges (i.e. all of which obeyQ
i
2
=0). However, the Hamiltonian cannot be expressed in a simple form in terms of thep supercharges except in a special case. A model of conformal parasupersymmetry is also discussed and it is shown that in this
case, thep supercharges, thep conformal supercharges along with HamiltonianH, conformal generatorK and dilatation generatorD form a closed algebra. 相似文献
28.
Arunabha Bagchi 《Journal of Mathematical Analysis and Applications》1976,56(1):195-210
A rigorous derivation of filtering arid smoothing equations for linear stochastic systems with time delay is presented. The estimation equations are obtained in term of the innovation process of the problem under consideration. The method used is based on a representation theorem on Gaussian martingales. 相似文献
29.
Bijan K Bagchi 《Pramana》1981,17(5):405-414
We consider the effects ofη−π mixing on the violation of the |ΔI|=1/2 rule in |ΔS|=1 weak transitions. The processes considered are theK→2π,K→3π, Λ, Ξ and Λ hyperon decays. 相似文献
30.