全文获取类型
收费全文 | 803篇 |
免费 | 25篇 |
国内免费 | 15篇 |
专业分类
化学 | 120篇 |
力学 | 13篇 |
综合类 | 16篇 |
数学 | 305篇 |
物理学 | 389篇 |
出版年
2023年 | 17篇 |
2022年 | 7篇 |
2021年 | 23篇 |
2020年 | 16篇 |
2019年 | 18篇 |
2018年 | 20篇 |
2017年 | 35篇 |
2016年 | 23篇 |
2015年 | 28篇 |
2014年 | 49篇 |
2013年 | 49篇 |
2012年 | 34篇 |
2011年 | 46篇 |
2010年 | 55篇 |
2009年 | 53篇 |
2008年 | 59篇 |
2007年 | 65篇 |
2006年 | 37篇 |
2005年 | 21篇 |
2004年 | 26篇 |
2003年 | 17篇 |
2002年 | 15篇 |
2001年 | 12篇 |
2000年 | 11篇 |
1999年 | 18篇 |
1998年 | 3篇 |
1997年 | 11篇 |
1996年 | 3篇 |
1995年 | 6篇 |
1994年 | 5篇 |
1993年 | 4篇 |
1992年 | 6篇 |
1991年 | 5篇 |
1990年 | 7篇 |
1988年 | 4篇 |
1986年 | 1篇 |
1985年 | 4篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1974年 | 2篇 |
1973年 | 4篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有843条查询结果,搜索用时 31 毫秒
81.
Hidetoshi Nishimori 《Physica A》2007,384(1):94-99
After a brief introduction to information theory, we review the close relationship between the theory of spin glasses and information processing, error-correcting codes in particular. An interesting equivalence of the solvability condition of the spin glass problem and the optimal inference condition in information theory is pointed out. 相似文献
82.
In this paper, we present a framework and two linear time algorithms for obtaining circular drawings of graphs. The first technique produces circular drawings of biconnected graphs and finds a zero crossing circular drawing if one exists. The second technique finds multiple embedding circle drawings. Techniques for the reduction of edge crossings are also discussed. Results of experimental studies are included. 相似文献
83.
This study is devoted to fuzzy rule based modelling of multiple-input single-output nonlinear numerical relationships. The model under investigation is viewed as a collection of conditional statements “if state Ωi then y = gi(x, ai)”, i = 1, 2,…, N with Ωi being a fuzzy relation defined in the space of the input variables. In contrast to the commonly encountered identification approach that is dwelled upon discrete experimental data, the one proposed in this study is concerned with explicitly articulated nonlinear input-output relationship. The main thrust is in the development of a fuzzy partition of the input variables completed through a sequence of fuzzy relations rather than Cartesian products of fuzzy sets. This approach allows us to maintain the number of necessary rules under control and avoid a combinatorial explosion otherwise inevitable in situations of highly multivariable functions. Introduced are criteria of separability and function variability whose objective is to guide a distribution and granularity of the linguistic labels forming the condition part of the rules. 相似文献
84.
Antonio Jiménez-Martínez 《International Journal of Game Theory》2006,34(3):425-442
We propose a two-person game-theoretical model to study information sharing decisions at an interim stage when information is incomplete. The two agents have pieces of private information about the state of nature, and that information is improved by combining the pieces. Agents are both senders and receivers of information. There is an institutional arrangement that fixes a transfer of wealth from an agent who lies about her private information. In our model, we show that (1) there is a positive relation between information revelation and the amount of the transfers, and (2) information revelation has a collective action structure, in particular, the incentives of an agent to reveal decrease with respect to the amount of information disclosed by the other. 相似文献
85.
Paul Marriott 《Annals of the Institute of Statistical Mathematics》2007,59(1):95-110
Local mixture models have proved useful in many statistical applications. This paper looks at ways in which the local assumption,
which is used in an asymptotic approximation, can be relaxed in order to generate a much larger class of models which still
have the very attractive geometric and inferential properties of local mixture models. The tool used to develop this large
class of models is the Karhunen–Loève decomposition. Computational issues associated with working with these models are also
briefly considered. 相似文献
86.
87.
Nigel J. Newton 《Journal of statistical physics》2008,133(4):711-737
This paper connects non-equilibrium statistical mechanics and optimal nonlinear filtering. The latter concerns the observation-conditional
behaviour of Markov signal processes, and thus provides a tool for investigating statistical mechanics with partial observations. These allow entropy
reduction, illustrating Landauer’s Principle in a quantitative way.
The joint process comprising a signal and its nonlinear filter is irreversible in its invariant distribution, which therefore
corresponds to a non-equilibrium stationary state of the associated joint system. Macroscopic entropy and energy flows are identified for this state. Since these are driven by observations internal to the system, they do not cause entropy increase, and so the joint system makes statistical mechanical sense in reverse
time.
Time reversal yields a dual system in which the signal and filter exchange roles. Despite the structural similarity of the original and dual systems,
there is a substantial asymmetry in their complexities. This reveals the direction of time, despite the systems being in stationary
states that do not produce entropy.
This work was partially supported by Leverhulme Trust Research Fellowship 2003/0426, by MURI Grant F49620-02-1-0325 (Complex
Adaptive Networks for Co-operative Control), by ARO-MURI Grant DAAD19-00-1-0466 (Data Fusion in Large Arrays of Microsensors
(sensor web)) and by NSF-ITR Grant CCR-0325774 Collaborative Research: New Approaches to Experimental Design and Statistical
Analysis of Genomic and Structural Biological Data from Multiple Sources. 相似文献
88.
K. C. Chu 《Journal of Optimization Theory and Applications》1978,25(1):139-160
This paper investigates the problem of unconstrained optimization when there is only partial information on the random parameters in the objective function. The relation between the optimization performance and the available information is established. The best information structure design with fixed rank is described. The designing procedure is set up in such a way that successive information augmentation or deletion can be considered. The procedure can also be extended to multiperson decision problems. 相似文献
89.
Sven Erlander 《Mathematical Programming》1981,21(1):137-151
This paper treats entropy constrained linear programs from modelling as well as computational aspects. The optimal solutions to linear programs with one additional entropy constraint are expressed in terms of Lagrange-multipliers. Conditions for uniqueness are given. Sensitivity and duality are studied. The Newton—Kantorovich method is used to obtain a locally convergent iterative procedure. Related problems based on maximum entropy or minimum information are discussed. 相似文献
90.