全文获取类型
收费全文 | 131979篇 |
免费 | 11477篇 |
国内免费 | 12602篇 |
专业分类
系统科学 | 4775篇 |
丛书文集 | 3673篇 |
教育与普及 | 2974篇 |
理论与方法论 | 447篇 |
现状及发展 | 911篇 |
研究方法 | 312篇 |
综合类 | 142945篇 |
自然研究 | 21篇 |
出版年
2024年 | 536篇 |
2023年 | 1220篇 |
2022年 | 1901篇 |
2021年 | 2234篇 |
2020年 | 2244篇 |
2019年 | 3913篇 |
2018年 | 4263篇 |
2017年 | 4580篇 |
2016年 | 4888篇 |
2015年 | 5925篇 |
2014年 | 6985篇 |
2013年 | 6330篇 |
2012年 | 6254篇 |
2011年 | 6801篇 |
2010年 | 6730篇 |
2009年 | 6585篇 |
2008年 | 6735篇 |
2007年 | 6675篇 |
2006年 | 5316篇 |
2005年 | 5260篇 |
2004年 | 4554篇 |
2003年 | 4161篇 |
2002年 | 4527篇 |
2001年 | 4187篇 |
2000年 | 3649篇 |
1999年 | 5210篇 |
1998年 | 4332篇 |
1997年 | 4366篇 |
1996年 | 3928篇 |
1995年 | 3413篇 |
1994年 | 3234篇 |
1993年 | 2864篇 |
1992年 | 2499篇 |
1991年 | 2353篇 |
1990年 | 1975篇 |
1989年 | 1748篇 |
1988年 | 1472篇 |
1987年 | 932篇 |
1986年 | 634篇 |
1985年 | 228篇 |
1984年 | 67篇 |
1983年 | 24篇 |
1982年 | 29篇 |
1980年 | 14篇 |
1979年 | 16篇 |
1977年 | 29篇 |
1972年 | 77篇 |
1969年 | 15篇 |
1968年 | 16篇 |
1967年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 671 毫秒
991.
李健 《山东师范大学学报(自然科学版)》1998,13(3):275-278
利用变换矩阵和ABCD定律讨论了激光谐振空对高我束的变换,推导出高斯光束参数通过光腔输出镜的变换公式。并对热透镜腔,光束远场发散角等问题进行了讨论。 相似文献
992.
引进了Δ-伪度量族概念,研究了Menger概率度量空间与Δ-伪度量族生成空间的关系,证明了每个Menger概率度量空间(E,F,Δ)都可由E上的一个Δ-伪度量族{dλ}λ∈(0,1)所确定. 相似文献
993.
系统地给出了C60在固态薄膜及不同有机溶液形态下的常规吸收光谱和三同商吸收光谱,确定了各相关光学跃迁能量,并通过对可见区电子--振动光谱结构的指认分析,给出了有机溶液形态下C60的能隙,基于Maxwell-Garnett有效介质模型理论,由不同有机溶剂形态下C60电子态能级结构参数外推获得了C60孤立分子的本征电子态能级结构参数,从而为详细了解和研究C60分子不同形态下电子态结构的变化提供了较完整 相似文献
994.
Genomic organization of EDSV strain AA-2 总被引:1,自引:0,他引:1
Liyu Zeng Qi Jin Jinggang Zhang Maoxiang Li Hong Li Lei Zhu Zhen Yin Yunde Hou 《科学通报(英文版)》1998,43(7):594-594
The genomic organization of egg drop syndrome virus strain AA-2 isolated in China is reported here. The genome was found to be 32 838 bp in length, approximately 2 kb shorter than those of the human subgenus C adenoviruses. Analysis of open reading frames indicated that the genes for major viral structural proteins (55 K, Penton base, pⅦ, pⅩ, pⅥ, Hexon, 100 K, pⅧ and Fiber), as well as EP, DNA polymerase and ⅣaⅡ are present in the expected locations in the genome. EDSV possesses no identifiable E3 and E4 regions and most proteins encoded by E3 and E4 regions of other adenoviruses genome were not presented in EDSV. 相似文献
995.
Under 2 100 bar of hydrostatic pressure, KNA N-glycosidase can still cleave the N-C bond of adenosine at position 4324 in
R/S domain of 28S RNA in rat ribosome, demonstrating that high pressure has no effect on the tertiary structure of S/R domain. 相似文献
996.
Histological and physiological studies indicated that most skeletal muscles can be divided into a series of relatively independent sub-volumes: "neuromuscular compartments" and the partitioning property of the muscle result in the localization of muscle reflex. In the present experiment we studied the recruitment properties of medial gastracnemius (MG) muscle motoneuron pool of decerebrate cat with two kinds of local mechanical stimulation: local stretch and acupuncture-like stimuli. The results indicate that: (ⅰ) there is an obvious property of localization of recruitment activity, only the MNs which innervate the stimulated compartment were recruited by weaker and shorter stimuli; (ⅱ) recruitment activity spread to those MNs which supply the adjacent and distal compartments during the strength of stimulation or duration of the stimulation was increased; and (ⅲ) the recruitment property of muscle activity elicited by the local mechanical stimulation is thought similar to that of "needle feeling" along the meridian pathway during stimulation of acupuncture point. 相似文献
997.
The realization and siructure of complete Lie algebras whose nilpotent radicals are Heisenberg algebras over the complex field
C are given. 相似文献
998.
999.
Chemical structure of immature sulfur-rich kerogen and composition of immature sulfur-rich crude oil in Jianghun oil field
have been studied. In molecular level, crude oil differs from thermolysed and chemolysed products of kerogen but does resemble
the bitumen in immature sulfur-rich source rock. Therefore, immature sulfur-rich oil may be derived from the expelling of
bitumen rather than from thermal cracking of kerogen. 相似文献
1000.
Discovery and character of the Kunlun-Yellow River Movement 总被引:2,自引:0,他引:2
Based on geomorphological, tectonic and sedimentary data, a Kunlun Yellow River Tectonic Movement has been recognized in 1 10-0 60 Ma B.P. This tectonic movement, which leads to uplift of the Qinghai_Xizang (Tibet) Plateau from 1 500 to 3 000-3 500 m, is periodic, abrupt and changeable in the movement rate of uplifting and slide slipping. 相似文献