全文获取类型
收费全文 | 1552篇 |
免费 | 71篇 |
国内免费 | 8篇 |
专业分类
化学 | 899篇 |
晶体学 | 6篇 |
力学 | 60篇 |
数学 | 317篇 |
物理学 | 205篇 |
无线电 | 144篇 |
出版年
2023年 | 14篇 |
2022年 | 42篇 |
2021年 | 49篇 |
2020年 | 55篇 |
2019年 | 26篇 |
2018年 | 36篇 |
2017年 | 30篇 |
2016年 | 70篇 |
2015年 | 63篇 |
2014年 | 83篇 |
2013年 | 92篇 |
2012年 | 104篇 |
2011年 | 128篇 |
2010年 | 84篇 |
2009年 | 70篇 |
2008年 | 105篇 |
2007年 | 92篇 |
2006年 | 70篇 |
2005年 | 69篇 |
2004年 | 58篇 |
2003年 | 43篇 |
2002年 | 38篇 |
2001年 | 19篇 |
2000年 | 15篇 |
1999年 | 14篇 |
1998年 | 9篇 |
1997年 | 14篇 |
1996年 | 18篇 |
1995年 | 8篇 |
1994年 | 8篇 |
1993年 | 8篇 |
1992年 | 5篇 |
1991年 | 9篇 |
1990年 | 7篇 |
1989年 | 6篇 |
1988年 | 10篇 |
1987年 | 6篇 |
1986年 | 7篇 |
1985年 | 11篇 |
1984年 | 8篇 |
1983年 | 9篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1964年 | 1篇 |
1916年 | 1篇 |
1914年 | 1篇 |
1899年 | 1篇 |
排序方式: 共有1631条查询结果,搜索用时 15 毫秒
101.
Potential Analysis - Given the pair of vector fields X = ?x + |z|2my?t and Y = ?y ?|z|2mx?t,where (x,y,t) = , we give a condition on a bounded domain which ensures... 相似文献
102.
103.
We study a family of problems set in a finely mixed periodic medium, modelling electrical conduction in biological tissues. We prove a unified derivation of these different schemes from the Maxwell equations in the quasi-stationary approximation and we investigate the behaviour of the corresponding macroscopic models. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
104.
105.
Daniele Pennesi 《Mathematics and Financial Economics》2018,12(1):55-73
Models with ambiguity averse preferences have the potential to explain some pricing anomalies on financial markets. However, the models used in applications make additional assumptions, beyond ambiguity aversion, on the structure of the investor’s preferences. Therefore, it is not clear how to disentangle the effect of ambiguity aversion from other features of preferences on equilibrium prices. This paper offers a general theory of asset pricing assuming only ambiguity aversion. Price indeterminacy may result in equilibrium when preferences are not smooth. A set of priors, which is identifiable in all the models used in applications, contains the relevant information to price assets. Ambiguity enriches the standard pricing formula by an additional stochastic discount factor and we calculate its explicit form for various models. 相似文献
106.
107.
Selecta Mathematica - For a reductive Lie algebra $$mathfrak {g}$$ , its nilpotent element f and its faithful finite dimensional representation, we construct a Lax operator L(z) with coefficients... 相似文献
108.
Daniele Mundici 《Archive for Mathematical Logic》1980,22(1-2):61-67
Let be the following statement: “for any infinite regularκ, for any uniform ultrafilterD onκ,D isλ-descendingly incomplete for all infiniteλ”. is weaker than ?0#. Assuming we prove the following: letL be a logic in which the class of sentences of typeτ is a set if so isτ; then: (I)L is compact iffL has JEP; (II)L satisfies Robinson Consistency Theorem iffL is compact and satisfies Craig Interpolation theorem; (III) if, in addition,L is single-sorted, thenL satisfies Robinson Consistency Theorem iffL has JEP#. JEP (resp. JEP#) are the natural generalizations for logicL of the familiar Joint Embedding Property of elementary (resp. complete) embeddings in first order logic. As a corollary, we characterize first order logic as the only logic having Löwenheim number equal toω together with JEP. 相似文献
109.
110.
Daniele Andreucci Paolo Bisegna Emmanuele DiBenedetto 《Comptes Rendus Mathematique》2002,335(4):329-332
We compute the homogenized-concentrated limit for a pair of non-linearly coupled diffusion equations in a perforated cylindric domain with coaxial cylindric holes periodically distributed along its axis. This problem arises from visual transduction. To cite this article: D. Andreucci et al., C. R. Acad. Sci. Paris, Ser. I 335 (2002) 329–332. 相似文献