全文获取类型
收费全文 | 74052篇 |
免费 | 279篇 |
国内免费 | 553篇 |
专业分类
系统科学 | 1282篇 |
丛书文集 | 873篇 |
教育与普及 | 300篇 |
理论与方法论 | 574篇 |
现状及发展 | 36830篇 |
研究方法 | 1652篇 |
综合类 | 31182篇 |
自然研究 | 2191篇 |
出版年
2013年 | 823篇 |
2012年 | 849篇 |
2011年 | 2994篇 |
2009年 | 639篇 |
2008年 | 1100篇 |
2007年 | 1256篇 |
2006年 | 1324篇 |
2005年 | 1508篇 |
2004年 | 2579篇 |
2003年 | 2223篇 |
2002年 | 1944篇 |
2001年 | 2127篇 |
2000年 | 1607篇 |
1999年 | 1315篇 |
1998年 | 654篇 |
1997年 | 780篇 |
1994年 | 691篇 |
1993年 | 699篇 |
1992年 | 1249篇 |
1991年 | 1063篇 |
1990年 | 1143篇 |
1989年 | 984篇 |
1988年 | 941篇 |
1987年 | 947篇 |
1986年 | 999篇 |
1985年 | 1164篇 |
1984年 | 1011篇 |
1983年 | 871篇 |
1982年 | 928篇 |
1981年 | 942篇 |
1980年 | 1099篇 |
1979年 | 1951篇 |
1978年 | 1736篇 |
1977年 | 1691篇 |
1976年 | 1377篇 |
1975年 | 1442篇 |
1974年 | 1658篇 |
1973年 | 1662篇 |
1972年 | 1738篇 |
1971年 | 1976篇 |
1970年 | 2351篇 |
1969年 | 1875篇 |
1968年 | 1825篇 |
1967年 | 1741篇 |
1966年 | 1529篇 |
1965年 | 1164篇 |
1959年 | 671篇 |
1958年 | 945篇 |
1957年 | 779篇 |
1956年 | 654篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
本文详细地叙述了“医院门诊部为门诊病人服务的CGPSS-F仿真系统”数据采集与分析的方法.利用CGPSS-F仿真系统的驻留在队列中的实体数和资源处于繁忙状态的单元数,合理调整实体在系统的时间.根据资源容量的利用,实体排队的长度和实体在系统的时间,确定实用的系统参数. 相似文献
32.
33.
34.
35.
P pili in uropathogenic E. coli are composite fibres with distinct fibrillar adhesive tips. 总被引:25,自引:0,他引:25
Escherichia coli is a frequent cause of several common bacterial infections in humans and animals, including urinary tract infections, bacteraemia and bacteria-related diarrhoea and is also the main cause of neonatal meningitis. Microbial attachment to surfaces is a key event in colonization and infection and results mainly from a stereochemical fit between microbial adhesins and complementary receptors on host cells. Bacterial adhesins required for extracellular colonization by Gram-negative bacteria are often minor components of heteropolymeric fibres called pili which must be oriented in an accessible manner in these structures to be able to bind to specific receptor architectures. P pili mediate the binding of uropathogenic E. coli to a digalactoside receptor determinant present in the urinary tract epithelium. We report here that the adhesin is a component of distinct fibrillar structures present at the tips of the pili. These virulence-associated tip fibrillae are thin, flexible polymers composed mostly of repeating subunits of PapE that frequently terminate with the alpha-D-galactopyranosyl-(1-4)-beta-D-galactopyranose or Gal alpha (1-4)Gal binding PapG adhesin. 相似文献
36.
Although theoretical studies show that overcompensatory density-dependent mechanisms can potentially generate regular or chaotic fluctuations in animal numbers, the majority of realistic single-species models of invertebrate populations are not overcompensatory enough to cause sustained population cycles. The possibility that overcompensation may generate cycles or chaos in vertebrate populations has seldom been considered. Here we show that highly overcompensatng density-dependent mortality can generate recurrent population crashes consistent with those observed in a naturally limited population of Soay sheep. The observed interval of three or more years between crashes points to sharp 'focusing' of mortality over a narrow range of population density. 相似文献
37.
Linear models are invariant under non-singular, scale-preserving linear transformations, whereas mean square forecast errors (MSFEs) are not. Different rankings may result across models or methods from choosing alternative yet isomorphic representations of a process. One approach can dominate others for comparisons in levels, yet lose to another for differences, to a second for cointegrating vectors and to a third for combinations of variables. The potential for switches in ranking is related to criticisms of the inadequacy of MSFE against encompassing criteria, which are invariant under linear transforms and entail MSFE dominance. An invariant evaluation criterion which avoids misleading outcomes is examined in a Monte Carlo study of forecasting methods. 相似文献
38.
39.
Humoral immune reactions to heat shock proteins (hsp) from microorganisms are one aspect of microbial infections in humans. The production of antibodies which are specific to epitopes present on procaryotic hsp leads also to the appearance of cross-reactive serum antibodies in the host organism that react with human hsp. This article discusses the consequences of such autoreactive antibodies for the host in context with the development of immune tolerance and autoimmune diseases, especially rheumatoid arthritis (RA), and in experimental animal models for arthritis such as adjuvant arthritis in rats. On the basis of epitope cross-reactivity between hsp and other host proteins, a hypothesis is presented for the development of autoimmune disease following the production of hsp-specific antibodies. 相似文献
40.
灰铸铁的应力屈服曲面及其三维热弹塑性应力解析 总被引:4,自引:0,他引:4
对原有的灰铸铁件应力屈服曲面进行了合理的简化,使其在理论上合理,工程应用上更为方便。建立了灰铸铁件三维非稳态热弹塑性应力场的有限元方法。以灰铸铁哑铃件为对象,用新屈服曲面对其应力发展过程进行了模拟,且比较了用新旧屈服面计算得到的结果。 相似文献