全文获取类型
收费全文 | 19077篇 |
免费 | 127篇 |
国内免费 | 209篇 |
专业分类
系统科学 | 175篇 |
丛书文集 | 231篇 |
教育与普及 | 108篇 |
理论与方法论 | 55篇 |
现状及发展 | 7656篇 |
研究方法 | 661篇 |
综合类 | 10369篇 |
自然研究 | 158篇 |
出版年
2012年 | 264篇 |
2011年 | 419篇 |
2010年 | 168篇 |
2009年 | 176篇 |
2008年 | 351篇 |
2007年 | 360篇 |
2006年 | 322篇 |
2005年 | 357篇 |
2004年 | 396篇 |
2003年 | 418篇 |
2002年 | 491篇 |
2001年 | 686篇 |
2000年 | 627篇 |
1999年 | 469篇 |
1994年 | 353篇 |
1992年 | 306篇 |
1991年 | 260篇 |
1990年 | 307篇 |
1989年 | 281篇 |
1988年 | 283篇 |
1987年 | 288篇 |
1986年 | 304篇 |
1985年 | 340篇 |
1984年 | 233篇 |
1983年 | 258篇 |
1982年 | 212篇 |
1981年 | 204篇 |
1980年 | 245篇 |
1979年 | 508篇 |
1978年 | 434篇 |
1977年 | 390篇 |
1976年 | 314篇 |
1975年 | 386篇 |
1974年 | 474篇 |
1973年 | 422篇 |
1972年 | 431篇 |
1971年 | 562篇 |
1970年 | 608篇 |
1969年 | 531篇 |
1968年 | 532篇 |
1967年 | 459篇 |
1966年 | 408篇 |
1965年 | 294篇 |
1959年 | 166篇 |
1958年 | 322篇 |
1957年 | 253篇 |
1956年 | 202篇 |
1955年 | 201篇 |
1954年 | 193篇 |
1948年 | 167篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
13.
14.
H R Brenner 《Nature》1985,317(6038):572-573
15.
1 Results This paper presents the development of platinum nanocomposites structures based on organically modified c.a.2 nm core platinum nanoparticles.The chemical modification of the 4-mercaptoaniline functionalized particles by various in coming molecules is evidenced and precisely quantified.The particles can be dissolved like molecules in various solvents depending on the features of the new crown and X-rays shows that the interparticle distance is affected by the crown modification.These platinum n... 相似文献
16.
延迟微分反馈法控制混沌 总被引:1,自引:0,他引:1
黄报星 《吉林大学学报(信息科学版)》2003,21(4):362-365
利用可测变量的微商进行反馈,提出了用延迟微分反馈控制(DDFC:DelayedDifferentialFeedbackControl)实现混沌控制的方法。理论证明了微分反馈控制和DDFC控制Lü系统3个平衡点的稳定可控性。在Matlab进行了数值仿真,结果表明,通过调节延迟时间τ和控制增益k,DDFC系统能自动寻找和稳定不同的不稳定周期轨道(UPO:UnstablePeriodicOrbit),实现混沌控制。 相似文献
17.
Obese postmenopausal female volunteers were given timed daily oral dosages of bromocriptine, and tested for reduction of body fat stores. This dopamine agonist has been shown to reset circadian rhythms that are altered in obese animals and to reduce body fat levels in several animal models. The participants were instructed not to alter their existing exercise and eating behavior during treatment. Skinfold measurements were taken on 33 subjects as indices of body fat. The measurements (e.g., suprailiac) were reduced after six weeks by about 25%, which represents a reduction of 11.7% of the total body fat. These dramatic decreases in body fat, which are equivalent to that produced by severe caloric restriction, were accompanied by more modest reductions of body weight (2.5%), indicating a possible conservation of protein that is usually lost as a consequence of such caloric restriction. The effects of bromocriptine treatment on body fat and hyperglycemia were also examined in non-insulin dependent diabetics being treated with oral hypoglycemics (7 subjects) or insulin (7 subjects). Total body fat was reduced by 10.7% and 5.1% in diabetics on oral hypoglycemics and insulin, respectively, without any significant reductions in body weight. Hyperglycemia was reduced in most of the 15 diabetic subjects treated leading to euglycemia and even cessation of hypoglycemic drugs in 3 of the 7 subjects during 4-8 weeks of bromocriptine treatment. These findings support the hypothesis that obesity and type II diabetes may be treated effectively with bromocriptine when administered at the proper times and dosages. 相似文献
18.
通过实例介绍了系统活动作为一个对象/类的概念,给出了对系统活动进行分析和建模的一般步骤,提出了系统活动描述的形式化方法。 相似文献
19.
考察了分析结构、结构构件以及技术系统中的位移、应变与应力的测量和实验方法在目前和未来的作用。现在,比以往任何时候都更有理由和有更广阔的领域需要用到实验力学方法;许多先进、现代化技术,新型测量设备,测量和赋值过程自动化系统可供使用;以先进的测量技术和计算机技术相结合而形成的各种杂交法已被提出来。利用这些方法,可以优化结构和产品,节约能源和原材料,提高产品质量,增强结构、技术系统的可靠、安全性,控制生产过程以及监督操作系统的安全性;利用这些方法,能够并且应当使技术系统可能发生的危险以及对环境的毁损降至最低程度。 相似文献
20.
In myelinated nerves, segregation of voltage-dependent sodium channels to nodes of Ranvier is crucial for saltatory conduction along axons. As sodium channels associate and colocalize with ankyrin at nodes of Ranvier, one possibility is that sodium channels are recruited and immobilized at axonal sites which are specified by the subaxolemmal cytoskeleton, independent of glial cell contact. Alternatively, segregation of channels at distinct sites along the axon may depend on glial cell contact. To resolve this question, we have examined the distribution of sodium channels, ankyrin and spectrin in myelination-competent cocultures of sensory neurons and Schwann cells by immunofluorescence, using sodium channel-, ankyrin- and spectrin-specific antibodies. In the absence of Schwann cells, sodium channels, ankyrin and spectrin are homogeneously distributed on sensory axons. When Schwann cells are introduced into these cultures, the distribution of sodium channels dramatically changes so that channel clusters on axons are abundant, but ankyrin and spectrin remain homogeneously distributed. Addition of latex beads or Schwann cell membranes does not induce channel clustering. Our results suggest that segregation of sodium channels on axons is highly dependent on interactions with active Schwann cells and that continuing axon-glial interactions are necessary to organize and maintain channel distribution during differentiation of myelinated axons. 相似文献