首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   8011篇
  免费   717篇
  国内免费   738篇
化学   246篇
晶体学   9篇
力学   531篇
综合类   127篇
数学   6416篇
物理学   2137篇
  2024年   11篇
  2023年   65篇
  2022年   118篇
  2021年   129篇
  2020年   154篇
  2019年   170篇
  2018年   179篇
  2017年   206篇
  2016年   235篇
  2015年   162篇
  2014年   396篇
  2013年   561篇
  2012年   280篇
  2011年   416篇
  2010年   401篇
  2009年   479篇
  2008年   580篇
  2007年   587篇
  2006年   517篇
  2005年   411篇
  2004年   384篇
  2003年   431篇
  2002年   358篇
  2001年   302篇
  2000年   288篇
  1999年   256篇
  1998年   224篇
  1997年   202篇
  1996年   144篇
  1995年   110篇
  1994年   95篇
  1993年   63篇
  1992年   61篇
  1991年   58篇
  1990年   38篇
  1989年   32篇
  1988年   42篇
  1987年   32篇
  1986年   23篇
  1985年   44篇
  1984年   32篇
  1983年   23篇
  1982年   25篇
  1981年   23篇
  1980年   20篇
  1979年   22篇
  1978年   18篇
  1977年   14篇
  1976年   14篇
  1975年   11篇
排序方式: 共有9466条查询结果,搜索用时 15 毫秒
51.
In this article,the Hausdorff dimension and exact Hausdorff measure function of any random sub-self-similar set are obtained under some reasonable conditions.Several examples are given at the end.  相似文献   
52.
In this paper we introduce the notion of generalized physical and SRB measures. These measures naturally generalize classical physical and SRB measures to measures which are supported on invariant sets that are not necessarily attractors. We then perform a detailed case study of these measures for hyperbolic Hènon maps. For this class of systems we are able to develop a complete theory about the existence, uniqueness, finiteness, and properties of these natural measures. Moreover, we derive a classification for the existence of a measure of full dimension. We also consider general hyperbolic surface diffeomorphisms and discuss possible extensions of, as well as the differences to, the results for Hènon maps. Finally, we study the regular dependence of the dimension of the generalized physical/SRB measure on the diffeomorphism. For the proofs we apply various techniques from smooth ergodic theory including the thermodynamic formalism. 2000 Mathematics Subject Classification. Primary: 37C45, 37D20, 37D35, Secondary: 37A35, 37E30  相似文献   
53.
How can the basic compatibility of theory and observations be investigated for nonlinear processes without requiring stochastic characterizations for residual error terms? The present paper proposes a flexible least-cost approach. For each possible estimatex for the sequence of process states, letc D (x) andx M(x) denote the costs incurred for deviations away from the prior dynamic specifications and prior measurement specifications, respectively. Define the cost-efficiency frontier to be the greatest lower bound for the set of all possible cost pairs [c D (x),c M(x)], conditional on the given observations. State sequence estimatesx that attain the cost-efficiency frontier indicate the possible ways that the actual process could have developed over time in a manner minimally incompatible with the prior dynamic and measurement specifications. An algorithm is developed for the exact sequential updating of the cost-efficient state sequence estimates as the duration of the process increases and additional observations are obtained.  相似文献   
54.
研究了基于支持向量机的后验概率的应用,提出了对样本集进行分解,以产生局部后验概率,根据模式的稳健性对局部后验概率进行凸组合融合的方法.  相似文献   
55.
56.
Some Results behind Dividend Problems   总被引:1,自引:0,他引:1  
We consider the basic dividend problem of the compound Poisson model with constant barrierstrategy.Some results concealed behind the dividend problem are made explicit in the present work.Differentmethods and some of which are firstly given in this paper.All these results presented certain direct relationshipbetween some important actuary variables in classical risk theory is also revealed.  相似文献   
57.
We analyze the statistical behavior of signals in nonlinear circuits with delayed feedback in the presence of external Markovian noise. For the special class of circuits with intense phase mixing we develop an approach for the computation of the probability distributions and multitime correlation functions based on the random phase approximation. Both Gaussian and Kubo-Andersen models of external noise statistics are analyzed and the existence of the stationary (asymptotic) random process in the long-time limit is shown. We demonstrate that a nonlinear system with chaotic behavior becomes a noise amplifier with specific statistical transformation properties.  相似文献   
58.
Banach空间二阶非线性脉冲微分-积分方程的极值解   总被引:1,自引:0,他引:1  
通过建立一个新的比较定理研究了B anach空间二阶非线性混合型脉冲微分-积分方程初值问题的极值解,所得结果推广和改进了现有文献的主要结果.  相似文献   
59.
We attempt a justification of a generalisation of the consistent histories programme using a notion of probability that is valid for all complete sets of history propositions. This consists of introducing Cox's axioms of probability theory and showing that our candidate notion of probability obeys them. We also give a generalisation of Bayes' theorem and comment upon how Bayesianism should be useful for the quantum gravity/cosmology programmes. PACS: 02.50.Cw;03.65.Ta;04.60.-m.  相似文献   
60.
By using the Lewis-Riesenfeld theory and algebraic method, we present an alternative approach to obtain the exact solution of time-dependent Hamiltonian systems involving quadratic, inverse quadratic and (1/x)p+p(1/x) terms. This solution is discussed and compared with that obtained by Choi, J. R. (2003). International Journal of Theoretical Physics 42, 853]. PACS: 03.65Ge; 03.65Fd; 03.65Bz  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号