全文获取类型
收费全文 | 14432篇 |
免费 | 932篇 |
国内免费 | 456篇 |
专业分类
系统科学 | 1446篇 |
丛书文集 | 276篇 |
教育与普及 | 209篇 |
理论与方法论 | 306篇 |
现状及发展 | 903篇 |
研究方法 | 34篇 |
综合类 | 12646篇 |
出版年
2024年 | 62篇 |
2023年 | 103篇 |
2022年 | 197篇 |
2021年 | 199篇 |
2020年 | 132篇 |
2019年 | 49篇 |
2018年 | 803篇 |
2017年 | 789篇 |
2016年 | 529篇 |
2015年 | 231篇 |
2014年 | 304篇 |
2013年 | 250篇 |
2012年 | 571篇 |
2011年 | 1282篇 |
2010年 | 1165篇 |
2009年 | 847篇 |
2008年 | 914篇 |
2007年 | 1136篇 |
2006年 | 374篇 |
2005年 | 370篇 |
2004年 | 394篇 |
2003年 | 382篇 |
2002年 | 324篇 |
2001年 | 327篇 |
2000年 | 278篇 |
1999年 | 486篇 |
1998年 | 445篇 |
1997年 | 435篇 |
1996年 | 405篇 |
1995年 | 377篇 |
1994年 | 320篇 |
1993年 | 246篇 |
1992年 | 239篇 |
1991年 | 214篇 |
1990年 | 183篇 |
1989年 | 146篇 |
1988年 | 149篇 |
1987年 | 89篇 |
1986年 | 43篇 |
1985年 | 19篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1980年 | 2篇 |
1967年 | 1篇 |
1960年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 947 毫秒
41.
The exponential Radon transform, a generalization of the Radon transform, is defined and studied as a mapping of function
spaces. It is represented in terms of Fourier transform of its domain and range, and this leads to the harmonic decomposition
reconstruction. The results are similar results of Tretiak and Metz.
Foundation item: Supported by the National Natural Science Foundation of China (No. 19971064), Key Project of Science and
Technology of Hubei Province Education Committee.
Biography: Wang Jin-ping (1963-), male, Ph.D. candidate, research direction: numberical solution of singular integral equation
and integral transformation etc. 相似文献
42.
“人口城镇化”是社会发展的必然趋势。本文从河南沁阳等九个“小城镇”的实际调查材料出发,较详细地讨论了农村劳动力向小城镇转移的流量,形成、就业层次和社会影响,说明中国的“人口城镇化”方向关键在于积极发展小城镇。 相似文献
43.
YU Jianqiao LIAO Jianwei 《武汉大学学报:自然科学英文版》2007,12(5):887-892
We propose a multiple-tree overlay structure for resource discovery in unstructured P2P systems. Peers that have similar interests or hold similar type of resources will be grouped into a tree-like cluster. We exploit the heterogeneity of peers in each cluster by connecting peers with more capacities closer to the root of the tree. The capacity of a peer can be defined in different ways (e.g. higher network bandwidth, larger disk space, more data items of a certain type etc.) according to different needs of users or applications. 相似文献
44.
In October 1924, The Physical Review, a relatively minor journal at the time, published a remarkable two-part paper by John H. Van Vleck, working in virtual isolation
at the University of Minnesota. Using Bohr’s correspondence principle and Einstein’s quantum theory of radiation along with
advanced techniques from classical mechanics, Van Vleck showed that quantum formulae for emission, absorption, and dispersion
of radiation merge with their classical counterparts in the limit of high quantum numbers. For modern readers Van Vleck’s
paper is much easier to follow than the famous paper by Kramers and Heisenberg on dispersion theory, which covers similar
terrain and is widely credited to have led directly to Heisenberg’s Umdeutung paper. This makes Van Vleck’s paper extremely valuable for the reconstruction of the genesis of matrix mechanics. It also
makes it tempting to ask why Van Vleck did not take the next step and develop matrix mechanics himself.
This paper was written as part of a joint project in the history of quantum physics of the Max Planck Institut für Wissenschaftsgeschichte and the Fritz-Haber-Institut in Berlin. 相似文献
45.
DING Mingtao WEI Fangqiang ZHANG Jinghong WANG Hongjuan 《武汉大学学报:自然科学英文版》2007,12(4):599-604
By analyzing the observation data from Dongchuan Debris Flow Observation and Research Station and historical data from year 1965 to 1990 gotten from National Astronomical Ob-servatories/Yunnan Observatory,the responding of debris flow in Jiangjia Ravine to Solar Proton Flare is studied. The following conclusion can be drawn. Solar Proton Flare,as one of most im-portant astronomical factors,affects the activity of debris flow in Yunnan. Generally,from 1965 to1990,the more active Solar Pro-ton Flare is,the greater the probability of high frequency and large runoff of debris flow is. On the contrary,the less active Solar Pro-ton Flare is,the greater the probability of low frequency,small runoff,and low sediment transport of debris flow is. 相似文献
46.
He Shenghou 《中国工程科学》2003,1(2):90-95
1Chinaoffshoreoil&gasresourcesandtheircharacteristicfeatures Chinaoffshoreoil&gasexplorationstartedduringthe1 95 0s .Until 1 971 ,thecommercialHai 4fieldwasfoundinBohai.Subsequentlytwoproductionplatformswereconstruc ted ,thefirstChinaoffshoreoilfieldwasformed .Fromthenon ,Chinaoffshoreoil&gasexplorationandexploitationspeedbecameprogressivelyfaster.Afteralargeamountofexplorationwork ,theoilandgasresourcesinChinacoastalareasweremadeclearpreliminarily .AccordingtoState sSecondaryResourceEva… 相似文献
47.
The unified chaotic system contains the Lorenz system and the Chen system as two dual systems at the two extremes of its parameter
spectrum. This paper presents the design of bang bang controller for unified system and multitude of numerical experiments
under various control parameters. Numerical experiments meet the theoretic proof perfectly and convincingly demonstrated the
controller can be effectively used for unified systems with uncertainty of the equilibrium points. The method enriches the
applications of chaotic control.
Foundation item: Supported by the National Natural Science Foundation of China(50209012)
Biography: Deng Xiao-ming (1980-), male, Master candidate, research direction: chaos control. 相似文献
48.
减薄炭化室炉墙是提高焦炉产量,节约能源,减少投资的重要途径之一。本文介绍我国厚80毫米炉墙焦炉的设计、施工与生产情况。 相似文献
49.
全国学生体质、健康调研工作所涉及的指标多、数据量大、计算内容多,因此,有必要研制一套功能较齐全完备、便于使用的微机统计计算系统.该文介绍了该系统的设计思想、特点、结构、功能以及使用效果,该系统适用于全国各地及各高等院校,可处理以前的体质调研数据或其他有关数据,通用性与实用性较强. 相似文献
50.