全文获取类型
收费全文 | 27162篇 |
免费 | 462篇 |
国内免费 | 886篇 |
专业分类
系统科学 | 930篇 |
丛书文集 | 607篇 |
教育与普及 | 187篇 |
理论与方法论 | 95篇 |
现状及发展 | 6304篇 |
研究方法 | 793篇 |
综合类 | 19073篇 |
自然研究 | 521篇 |
出版年
2021年 | 261篇 |
2020年 | 185篇 |
2017年 | 207篇 |
2016年 | 260篇 |
2015年 | 430篇 |
2014年 | 549篇 |
2013年 | 780篇 |
2012年 | 1023篇 |
2011年 | 1637篇 |
2010年 | 1023篇 |
2009年 | 1002篇 |
2008年 | 1281篇 |
2007年 | 1313篇 |
2006年 | 1230篇 |
2005年 | 1105篇 |
2004年 | 802篇 |
2003年 | 601篇 |
2002年 | 724篇 |
2001年 | 888篇 |
2000年 | 858篇 |
1999年 | 639篇 |
1998年 | 205篇 |
1997年 | 186篇 |
1992年 | 334篇 |
1991年 | 296篇 |
1990年 | 283篇 |
1989年 | 267篇 |
1988年 | 244篇 |
1987年 | 240篇 |
1986年 | 215篇 |
1985年 | 248篇 |
1984年 | 235篇 |
1980年 | 200篇 |
1979年 | 445篇 |
1978年 | 340篇 |
1977年 | 369篇 |
1976年 | 265篇 |
1975年 | 322篇 |
1974年 | 446篇 |
1973年 | 379篇 |
1972年 | 363篇 |
1971年 | 422篇 |
1970年 | 484篇 |
1969年 | 425篇 |
1968年 | 407篇 |
1967年 | 442篇 |
1966年 | 384篇 |
1965年 | 301篇 |
1958年 | 231篇 |
1957年 | 179篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
A. Gutnisky P. Glikman M. F. Gimeno A. L. Gimeno 《Cellular and molecular life sciences : CMLS》1982,38(1):116-117
Summary The administration of 15(R)-15-methyl prostaglandin E2 (15(R)-15-M-PGE2) in vivo significantly diminished the uptake of59Fe into blood, spleen, liver, femur and dried intestine of rats, whereas acetylsalicylic acid (ASA) increased the counts significantly. This effect of ASA was counteracted by 15(R)-15-M-PGE2. It is suggested that prostaglandins (PGs) might play an important role in inhibiting iron absorption at the intestinal level.This work was supported by grant No.6638 from CONICET (Argentina). The technical assistance of Mrs María E. Castro and Norma Rizzo is gratefully acknowleged. 相似文献
42.
随着香港、澳门的先后回归,宪法学的体系也应作相应的调整,香港、澳门特别行政区制度应作为单独的一章列入宪法学的体系。 相似文献
43.
During the evolution of proteins the pressure to optimize biological activity is moderated by a need for efficient folding. For most proteins, this is accomplished through spontaneous folding to a thermodynamically stable and active native state. However, in the extracellular bacterial alpha-lytic protease (alphaLP) these two processes have become decoupled. The native state of alphaLP is thermodynamically unstable, and when denatured, requires millennia (t1/2 approximately 1,800 years) to refold. Folding is made possible by an attached folding catalyst, the pro-region, which is degraded on completion of folding, leaving alphaLP trapped in its native state by a large kinetic unfolding barrier (t1/2 approximately 1.2 years). alphaLP faces two very different folding landscapes: one in the presence of the pro-region controlling folding, and one in its absence restricting unfolding. Here we demonstrate that this separation of folding and unfolding pathways has removed constraints placed on the folding of thermodynamically stable proteins, and allowed the evolution of a native state having markedly reduced dynamic fluctuations. This, in turn, has led to a significant extension of the functional lifetime of alphaLP by the optimal suppression of proteolytic sensitivity. 相似文献
44.
为适应知识经济时代的要求,高校财务监督体系必须进行变革和完善。本文就这一课题,分别从当前所面临的新形势,高校财务监督体系变革和完善的举措以及应该注意的一些问题做了阐述。 相似文献
45.
A. E. Yassen H. A. Hassan L. S. Kawashti 《Cellular and molecular life sciences : CMLS》1994,50(11-12):1111-1114
A detailed karyotypic analysis of two Egyptian species of bats,Taphozous perforatus andTaphozous nudiventris, was made on the basis of conventional data and G-band patterns. No detectable karyotypic difference was found between the two species (2n=42, F.N. 64). By comparison of G-band patterns, some differences between the two species were seen in the corresponding autosomal pairs. These results are reported for the first time in Egypt. 相似文献
46.
韩民 《石油大学学报(自然科学版)》2006,30(4):137-139
当油气田生产进入开发中后期阶段时,为了减缓原油产量的递减,需要不断地对油井实施增产措施.而选择适宜时机进行措施作业,是控制成本、提高效益的重要手段之一.如果把措施费用看作一项投资,则投资回收是判断增产措施是否可行的依据.从经济学的角度对增产措施的成本和收益进行了分析,给出了实施油井增产措施的最佳时机及措施终点产量的模型.结果表明,最佳增产措施时机是油井的收益和成本相等时;构建的措施终点产量模型可用来判断该措施是否具有经济价值,从而为单井增产措施决策提供理论依据. 相似文献
47.
介绍了平面机构运动数字化控制系统的设计,其设计主要是对机械原理实验室中平面机构运动演示板进行改进,从原来的以单片机为控制核心到以微机系统为核心,系统控制本质是通过对解说语音文件的操作来达到对126个机构进行任意的操作,并且在性能上实现了易调试、可视化、多媒体等特点和功能,使教学效果得到显著提高,同时对于工业网络控制也具有一定的借鉴作用。 相似文献
48.
The gas-liquid-liquid reactive extraction system for preparing hydrogen peroxide via anthraquinone was investigated. The oxidation reaction of hydrogenated working solution was combined with the extraction of hydrogen peroxide from working solution in a sieve plate column. The reaction of 2-ethylanthrahydroquionone with oxygen and the liquid-liquid extraction of hydrogen peroxide take place simultaneously. The oxygen was introduced with hydrogenated working solution through a nozzle in the bottom of the column, which worked as agitated air as well as oxidation reagent. The results showed the oxidation and extraction do not hamper each other, on the contrary, the presence of oxidation gas in the column can promote the transfer of hydrogen peroxide from organic phase to aqueous phase, thus the reaction efficiency and extraction efficiency increased with increasing gas superficial velocity. Furthermore, the oxidation efficiency is almost 100% and the extraction efficiency is higher than 90% in this process. 相似文献
49.
50.
对钢轨铝热焊接头的断口进行了实验观察与研究,分析了接头断裂形成的原因,认为焊缝外观缺陷与内部微裂纹是导致接头短期服役断裂的主要原因,并在此基础上提出了相应的防止措施. 相似文献