全文获取类型
收费全文 | 39805篇 |
免费 | 117篇 |
国内免费 | 187篇 |
专业分类
系统科学 | 208篇 |
丛书文集 | 588篇 |
教育与普及 | 69篇 |
理论与方法论 | 148篇 |
现状及发展 | 17512篇 |
研究方法 | 1607篇 |
综合类 | 19301篇 |
自然研究 | 676篇 |
出版年
2013年 | 366篇 |
2012年 | 548篇 |
2011年 | 1234篇 |
2010年 | 248篇 |
2008年 | 664篇 |
2007年 | 779篇 |
2006年 | 798篇 |
2005年 | 722篇 |
2004年 | 739篇 |
2003年 | 678篇 |
2002年 | 698篇 |
2001年 | 1346篇 |
2000年 | 1256篇 |
1999年 | 811篇 |
1992年 | 777篇 |
1991年 | 572篇 |
1990年 | 674篇 |
1989年 | 686篇 |
1988年 | 634篇 |
1987年 | 682篇 |
1986年 | 662篇 |
1985年 | 792篇 |
1984年 | 623篇 |
1983年 | 530篇 |
1982年 | 480篇 |
1981年 | 490篇 |
1980年 | 593篇 |
1979年 | 1242篇 |
1978年 | 1030篇 |
1977年 | 986篇 |
1976年 | 820篇 |
1975年 | 869篇 |
1974年 | 1205篇 |
1973年 | 1024篇 |
1972年 | 1053篇 |
1971年 | 1211篇 |
1970年 | 1525篇 |
1969年 | 1118篇 |
1968年 | 1145篇 |
1967年 | 1074篇 |
1966年 | 965篇 |
1965年 | 678篇 |
1964年 | 184篇 |
1959年 | 366篇 |
1958年 | 625篇 |
1957年 | 424篇 |
1956年 | 349篇 |
1955年 | 338篇 |
1954年 | 328篇 |
1948年 | 234篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Brian Young 《Studies in history and philosophy of science》2004,35(3):645-663
The career of John Jackson (1686-1763), Arian theologian and controversialist, provides a key to unlocking the early reception and quick collapse of a Newtonian natural apologetic originally developed by Samuel Clarke. The importance of friendship and discipleship in eighteenth-century intellectual enquiry is emphasised, and the links between Newton and his followers are traced alongside those of a group of Cambridge Lockeans, led by Jackson’s direct contemporary Daniel Waterland, who proved instrumental in the initial dismantling of Clarke’s brand of Newtonian apologetic. The controversial context of this engagement is shown to have been largely provided by the religiously compromising rise of freethinking, and Tindal’s Christianity as old as the creation (1731) signalled the dangers to proponents of natural religion as an adjunct of Christian apologetic in such a heated atmosphere. Religious division of the sort that resulted paradoxically played into the hands of the freethinkers in the anticlerical atmosphere of the 1730s, and accusations were exchanged between Newtonians and Lockeans accordingly. The dynamic of England’s Enlightenment experience is, then, a complicated one, and, as the career and writings of Jackson and William Whiston demonstrate, it was one which absorbed as well as repudiated ‘enthusiasm’. 相似文献
2.
3.
董文伟 《科技情报开发与经济》2004,14(6):296-297
以具体工程为例,介绍了建筑物地基处理的设计、施工中遵循的原则,施工中遇到特殊情况时采取的处理方法和必要的检测方法,对几种桩基的设计要求、施工工艺及过程、质量控制等情况进行了简单阐述。 相似文献
4.
Photon emission of phagocytes in relation to stress and disease. 总被引:1,自引:0,他引:1
Phagocytes, the first-line cells of the body's defence mechanisms against invading pathogens, kill microorganisms by means of lysosomal degradative enzymes and highly toxic reactive oxygen intermediates. The reactive oxygen compounds are produced, in a process called the 'respiratory burst', by the NADPH oxidase complex in plasma membranes, and by myeloperoxidase in phagolysosomes after degranulation. These processes generate electronically excited states which, on relaxation, emit photons, giving rise to phagocyte chemiluminescence (CL). This paper describes the conditions for the measurement of CL, and reviews the activity of phagocytes from individuals undergoing stress or disease. The capability of phagocytes to emit photons reflects remarkably well the pathophysiological state of the host. In many cases even the magnitude of the stress, the presence of a pathogen in the body, or the activity of the disease can be estimated. Physiological changes, e.g. in the reproductive cycle, can also be predicted. 相似文献
5.
6.
7.
M.Hasegawa 《复旦学报(自然科学版)》2007,(5)
1 Results In the coordination system by using complexation with organic ligand, the ff emission of lanthanide(Ⅲ) (Ln(Ⅲ)) is induced the excitation energy transfer form the organic chromophore under the light-irradiation. However, there are not so much number of reports to discuss the energy relaxation mechanism in such complexes with Ln(Ⅲ). Recently, we succeeded firstly to estimate the rate constant of the energy transfer between the ligand and Ln(Ⅲ) in Pr(Ⅲ)-phenanthroline analogs[1]. Here, we will di... 相似文献
8.
9.
V.A.帕瑟根 《国外科技新书评介》2007,(2):7-7
分子间的范德华力是十分微弱的,但可以说普遍的存在着,在很多体系中起着巨大的作用,在物理学、化学、生物学等学科中得到了广泛的研究。但怎样计算范德华力?如何考虑各种条件对范德华力的影响? 相似文献
10.