全文获取类型
收费全文 | 9355篇 |
免费 | 1067篇 |
国内免费 | 219篇 |
专业分类
化学 | 339篇 |
晶体学 | 6篇 |
力学 | 132篇 |
综合类 | 138篇 |
数学 | 1374篇 |
物理学 | 2239篇 |
无线电 | 6413篇 |
出版年
2024年 | 28篇 |
2023年 | 116篇 |
2022年 | 369篇 |
2021年 | 437篇 |
2020年 | 353篇 |
2019年 | 200篇 |
2018年 | 167篇 |
2017年 | 315篇 |
2016年 | 444篇 |
2015年 | 394篇 |
2014年 | 738篇 |
2013年 | 604篇 |
2012年 | 650篇 |
2011年 | 660篇 |
2010年 | 468篇 |
2009年 | 513篇 |
2008年 | 587篇 |
2007年 | 620篇 |
2006年 | 506篇 |
2005年 | 469篇 |
2004年 | 378篇 |
2003年 | 332篇 |
2002年 | 262篇 |
2001年 | 162篇 |
2000年 | 145篇 |
1999年 | 89篇 |
1998年 | 76篇 |
1997年 | 72篇 |
1996年 | 66篇 |
1995年 | 85篇 |
1994年 | 71篇 |
1993年 | 35篇 |
1992年 | 18篇 |
1991年 | 24篇 |
1990年 | 23篇 |
1989年 | 24篇 |
1988年 | 17篇 |
1987年 | 14篇 |
1986年 | 9篇 |
1985年 | 20篇 |
1984年 | 11篇 |
1983年 | 11篇 |
1982年 | 7篇 |
1981年 | 5篇 |
1980年 | 6篇 |
1979年 | 5篇 |
1978年 | 8篇 |
1976年 | 5篇 |
1974年 | 4篇 |
1972年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
61.
This paper studies a supply chain consisting of two suppliers and one retailer in a spot market, where the retailer uses the
newsvendor solution as its purchase policy, and suppliers compete for the retailer’s purchase. Since each supplier’s bidding
strategy affects the other’s profit, a game theory approach is used to identify optimal bidding strategies. We prove the existence
and uniqueness of a Nash solution. It is also shown that the competition between the supplier leads to a lower market clearing
price, and as a result, the retailer benefits from it. Finally, we demonstrate the applicability of the obtained results by
deriving optimal bidding strategies for power generator plants in the deregulated California energy market.
Supported in part by RGC (Hong Kong) Competitive Earmarked Research Grants (CUHK4167/04E and CUHK4239/03E), a Distinguished
Young Investigator Grant from the National Natural Sciences Foundation of China, and a grant from Hundred Talents Program
of the Chinese Academy of Sciences. 相似文献
62.
Bassan Bruno Gossner Olivier Scarsini Marco Zamir Shmuel 《International Journal of Game Theory》2003,32(1):17-31
We exhibit a general class of interactive decision situations in which all the agents benefit from more information. This class includes as a special case the classical comparison of statistical experiments à la Blackwell.
AMS 2000 Subject Classification:Primary 91A35.The work of Bruno Bassan and Marco Scarsini was partially supported by MIUR-COFIN. The authors express their thanks to Sylvain Sorin for enlightening comments. 相似文献
63.
近些年来,许多处理近似问题的方法陆续被提出,其中利用Rough集理论计算两个集合的并和交的Rough隶属函数方法是被用较多的一种方法,但毕竟该方法精度较差。为此,介绍了一种精度较高的计算两个集合的并和交的Rough隶属函数方法,它克服了前者利用Rough集理论计算Rough隶属函数的复杂性,而迎来了简单和高精度的特点。 相似文献
64.
65.
M. I. Dykman D. G. Luchinsky R. Mannella P. V. E. McClintock N. D. Stein N. G. Stocks 《Il Nuovo Cimento D》1995,17(7-8):661-683
Summary We outline the historical development of stochastic resonance (SR), a phenomenon in which the signal and/or the signal-to-noise
ratio in a nonlinear system increase with increasing intensity of noise. We discuss basic theoretical ideas explaining and
describing SR, and we review some revealing experimental data that place SR within the wider context of statistical physics.
We emphasize the close relationship of SR to some effects that are well known in condensed-matter physics.
Paper presented at the International Workshop ?Fluctuations in Physics and Biology: Stochastic Resonance, Signal Processing
and Related Phenomena?, Elba, 5–10 June 1994. 相似文献
66.
This paper introduces a definition of reliability based on a process range. Thus, process failure is defined when the range of a process first reaches a given and unacceptable level. The Mean Time To Failure (MTTF) which is denned as the mean of the first time for a range to attain a given amplitude is then calculated for an asymmetric random walk process. The probability distribution of the range is then given and the process reliability over long periods of system operations are then calculated. Applications such as the control of wings movements, stock price and exchange rates volatility (defined in terms of reliability) are also used to motivate the usefulness of range processes in reliability studies. Finally, we point out that there is necessarily a relationship between the range reliability and the propensity of a series to become chaotic. 相似文献
67.
A. Hansen M.H. Jensen K. Sneppen G. Zocchi 《The European Physical Journal B - Condensed Matter and Complex Systems》1998,6(1):157-161
We present a statistical mechanics treatment of the stability of globular proteins which takes explicitly into account the
coupling between the protein and water degrees of freedom. This allows us to describe both the cold and the warm unfolding,
thus qualitatively reproducing the known thermodynamics of proteins.
Received: 19 March 1998 / Revised and Accepted: 25 May 1998 相似文献
68.
69.
信息高速公路是信息社会的支柱,电子信息产业是信息社会中国家经济的支柱产业。本文在对信息高速公路具体内容进行了介绍的基础上,对信息高速公路技术结构进行了分析,对信息高速公路与电子信息产业及国民经济发展的重要关系进行了阐述。 相似文献
70.
Perfect information two-person zero-sum markov games with imprecise transition probabilities 总被引:1,自引:0,他引:1
Hyeong Soo Chang 《Mathematical Methods of Operations Research》2006,64(2):335-351
Based on an extension of the controlled Markov set-chain model by Kurano et al. (in J Appl Prob 35:293–302, 1998) into competitive two-player game setting, we provide a model of perfect information two-person zero-sum Markov games with imprecise transition probabilities. We define an equilibrium value for the games formulated with the model in terms of a partial order and then establish the existence of an equilibrium policy pair that achieves the equilibrium value. We further analyze finite-approximation error bounds obtained from a value iteration-type algorithm and discuss some applications of the model. 相似文献