全文获取类型
收费全文 | 714篇 |
免费 | 12篇 |
国内免费 | 11篇 |
专业分类
化学 | 468篇 |
晶体学 | 9篇 |
力学 | 18篇 |
数学 | 170篇 |
物理学 | 72篇 |
出版年
2022年 | 11篇 |
2021年 | 10篇 |
2020年 | 7篇 |
2019年 | 3篇 |
2017年 | 12篇 |
2016年 | 16篇 |
2015年 | 5篇 |
2014年 | 19篇 |
2013年 | 58篇 |
2012年 | 45篇 |
2011年 | 48篇 |
2010年 | 31篇 |
2009年 | 32篇 |
2008年 | 52篇 |
2007年 | 40篇 |
2006年 | 33篇 |
2005年 | 20篇 |
2004年 | 27篇 |
2003年 | 15篇 |
2002年 | 20篇 |
2001年 | 7篇 |
2000年 | 11篇 |
1999年 | 7篇 |
1998年 | 10篇 |
1997年 | 13篇 |
1996年 | 10篇 |
1995年 | 9篇 |
1994年 | 12篇 |
1993年 | 4篇 |
1992年 | 6篇 |
1991年 | 6篇 |
1990年 | 3篇 |
1989年 | 9篇 |
1988年 | 8篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1985年 | 6篇 |
1984年 | 8篇 |
1983年 | 3篇 |
1982年 | 5篇 |
1981年 | 11篇 |
1980年 | 10篇 |
1979年 | 8篇 |
1978年 | 5篇 |
1977年 | 5篇 |
1976年 | 6篇 |
1975年 | 6篇 |
1974年 | 6篇 |
1973年 | 7篇 |
1968年 | 4篇 |
排序方式: 共有737条查询结果,搜索用时 15 毫秒
81.
In this paper, we describe a general method for constructing the posterior distribution of the mean and volatility of the return of an asset satisfying dS=SdX for some simple models of X. Our framework takes as inputs the prior distributions of the parameters of the stochastic process followed by the underlying, as well as the likelihood function implied by the observed price history for the underlying. As an application of our framework, we compute the value at risk (VaR) and conditional VaR (CVaR) measures for the changes in the price of an option implied by the posterior distribution of the volatility of the underlying. The implied VaR and CVaR are more conservative than their classical counterpart, since it takes into account the estimation risk that arises due to parameter uncertainty. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
82.
Henryk Gzyl 《Journal of statistical physics》1982,29(3):617-622
We integrate by very simple means the Boltzmann equation in the relaxation time approximation. Our result improves on the solution previously found by Chambers, which does not take into account initial conditions. 相似文献
83.
Henryk Minc 《Linear and Multilinear Algebra》1984,15(3):225-243
A study of properties of matrices with minimum permanent in a face of the polyhedron of doubly stochastic n × n matrices. The minima are determined for certain faces. 相似文献
84.
Henryk Hudzik 《Indagationes Mathematicae》2004,15(2):245-255
We first prove that if x is an element on the unit sphere of arbitrary Köthe space E, x is strickly positive μ-a.e. and x is an LM-point, then x is an UM-point. Criteria for lower and upper monotone points in Calderón-Lozanovskiǐ spaces E? are presented. Points of lower local uniform monotonicity and upper local uniform monotonicity in E? are also considered. Some sufficient conditions and necessary conditions for these properties of a given point x in S(E?+) are given. 相似文献
85.
We measured the wavelength-dependent intensity decays of 4,9-dihydro-4,6-dimethyl-9-oxo-1H-imidazo-1,2a-purine (Yt-base) in propanol to determine the time-resolved emission spectra and rates of spectral relaxation. We found that resolution of the spectral relaxation times was dramatically improved by global analysis of the frequency-domain data with increasing amounts of the collisional quencher CCl4. Collisional quenching preferentially decreases the longer-lived relaxed component of the emission, thereby increasing the fractional contribution of the incompletely relaxed portion of the emission. The data could not be explained by a single spectral relaxation time, and at least two relaxation times are needed to describe the time-dependent emission center of gravity of Yt-base.Dedicated to Professor Stefan Paszyc on the occasion of his 70th birthday. 相似文献
86.
Yunan Cui Henryk Hudzik Hongwei Zhu 《Proceedings of the American Mathematical Society》1998,126(1):115-121
Maluta's coefficient of Musielak-Orlicz sequence spaces equipped with the Orlicz norm is calculated. A sufficient condition for the Schur property of these spaces is given.
87.
Photolysis of barbital yields derivatives of urea and biuret. The mechanism of ring opening involves an isocyanate intermediate. 相似文献
88.
A relation between the enthalpy of formation and the rate of change with normal coordinate of the dipole moment contribution due to the charge-transfer phenomenon is derived for electron donor-acceptor complexes formed between halogen and organic molecules. The relation is found to hold for a number of iodine complexes. 相似文献
89.
90.