全文获取类型
收费全文 | 39429篇 |
免费 | 1833篇 |
国内免费 | 1690篇 |
专业分类
系统科学 | 2338篇 |
丛书文集 | 1116篇 |
教育与普及 | 811篇 |
理论与方法论 | 445篇 |
现状及发展 | 982篇 |
研究方法 | 69篇 |
综合类 | 37187篇 |
自然研究 | 4篇 |
出版年
2024年 | 116篇 |
2023年 | 333篇 |
2022年 | 586篇 |
2021年 | 613篇 |
2020年 | 519篇 |
2019年 | 283篇 |
2018年 | 1022篇 |
2017年 | 1119篇 |
2016年 | 868篇 |
2015年 | 999篇 |
2014年 | 1371篇 |
2013年 | 1313篇 |
2012年 | 1716篇 |
2011年 | 2571篇 |
2010年 | 2439篇 |
2009年 | 2305篇 |
2008年 | 2551篇 |
2007年 | 2836篇 |
2006年 | 1717篇 |
2005年 | 1583篇 |
2004年 | 1295篇 |
2003年 | 1261篇 |
2002年 | 1288篇 |
2001年 | 1164篇 |
2000年 | 1039篇 |
1999年 | 1431篇 |
1998年 | 1060篇 |
1997年 | 1177篇 |
1996年 | 1018篇 |
1995年 | 950篇 |
1994年 | 797篇 |
1993年 | 684篇 |
1992年 | 606篇 |
1991年 | 564篇 |
1990年 | 491篇 |
1989年 | 426篇 |
1988年 | 371篇 |
1987年 | 269篇 |
1986年 | 133篇 |
1985年 | 42篇 |
1984年 | 7篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1967年 | 1篇 |
1955年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
91.
金艳 《武汉科技学院学报》2002,15(2):76-78
我国政府采购市场面临着对外开放的必然要求。作为WTO的成员国,无论从理论还是发展趋势看,都应当按照WTO《政府采购协议》建立系统的政府采购制度,以适应国际大市场和国内财政资金管理的要求。 相似文献
92.
The glutathione (GSH) monolayer and complex monolayer of GSH-metallic ion on polycrystalline gold electrode were studied by
using K3Fe(CN)6 as the redox probe. As for the GSH monolayer, it was found that the metallic ions could open the ion-gate in the monolayer
dramatically in the order La3+> Pb2+>>Ba2+>Ca2+ whereas Zn2+ ion closed the ion-gate. The complexes of GSH-metallic ions were capable of self-assembling the different kind of monolayer.
All the differences were related to the structural configuration of the anchored GSH molecule, which changed with different
metallic ions or pH.
Biography:Fang Cheng (1971-) male, Ph. D, research direction: electroanlysis. 相似文献
93.
DC主题元素描述方式研究 总被引:2,自引:0,他引:2
饶艳 《武汉科技学院学报》2002,15(2):104-107
对DC的主题元素描述方式进行研究,将传统的图书馆信息揭示理论与网络信息资源有机结合起来,采用受控主题词对网络信息资源进行组织,从而提高网络信息资源的检全率与检准率。 相似文献
94.
用边界积分方法分析了表面裂纹在接触载荷作用下的张开位移和应力强度因子,该方法将埋在无穷大弹性介质中裂纹模拟为连续分布的位错环,根据两个位错环之间的相互作用能可以得到弹性体的应变能,对弹性体的势能取极值,可以得到关于裂纹张开位移的边界积分方程,通过把半空间的边界模拟成一个包含在无穷大弹性介质中大裂纹,该方法能用已有的边界积分方法很好的处理具有任意表面形状的表面裂纹,文中算例分析了不同倾角的表面裂纹在法向和切向接触载荷作用下,裂纹尖端的应力强度因子,其结果对于分析路面表面裂纹的扩展具有重要意义。 相似文献
95.
本文叙述了倍半萜类化合物——β-桉烯、衍生物Neointermedeol以及1,2,3,4,7,8-六氢-5,8-二甲基-3-异丙烯基萘的合成。初步药理筛选结果表明,这三个化合物均具有一定的抗生育活性。化合物还未见报道,它的化学结构在本文得到证实。 相似文献
96.
通过对英国BTEC教学模式本土化的改造实践,天津职业大学酒店管理专业逐步形成了具有突出专业核心竞争力的“一个核心、二个着力点、三证并举、四制并行”的办学特色。 相似文献
97.
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
98.
The present study mainly probed the relationships between ERP components and the degrees of difficulty in visual search. Three experimental and one controlled conditions were randomly selected. Results showed that the P1, N1, and P2 amplitudes and latencies had no significant differences among the three experimental and one controlled conditions, and the ERP waveforms of low perceptual load of visual search were different from that of high perceptual load. These results might indicate that the latencies and amplitudes of initial P1, N1 and P2 in high and low perceptual load conditions were almost the same. The ERP waveforms of parallel search were very different from that of serial search, and the ERP waveforms of serial search were very similar. The P3 amplitudes increased as the degrees of the difficulty in visual search decreased. 相似文献
99.
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
100.
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