全文获取类型
收费全文 | 17391篇 |
免费 | 35篇 |
国内免费 | 43篇 |
专业分类
系统科学 | 72篇 |
丛书文集 | 264篇 |
教育与普及 | 34篇 |
理论与方法论 | 99篇 |
现状及发展 | 8211篇 |
研究方法 | 760篇 |
综合类 | 7848篇 |
自然研究 | 181篇 |
出版年
2013年 | 84篇 |
2012年 | 215篇 |
2011年 | 410篇 |
2010年 | 89篇 |
2008年 | 238篇 |
2007年 | 265篇 |
2006年 | 309篇 |
2005年 | 282篇 |
2004年 | 408篇 |
2003年 | 281篇 |
2002年 | 274篇 |
2001年 | 493篇 |
2000年 | 457篇 |
1999年 | 338篇 |
1992年 | 296篇 |
1991年 | 225篇 |
1990年 | 245篇 |
1989年 | 241篇 |
1988年 | 214篇 |
1987年 | 239篇 |
1986年 | 287篇 |
1985年 | 344篇 |
1984年 | 239篇 |
1983年 | 233篇 |
1982年 | 210篇 |
1981年 | 219篇 |
1980年 | 236篇 |
1979年 | 576篇 |
1978年 | 483篇 |
1977年 | 449篇 |
1976年 | 345篇 |
1975年 | 414篇 |
1974年 | 580篇 |
1973年 | 467篇 |
1972年 | 483篇 |
1971年 | 562篇 |
1970年 | 709篇 |
1969年 | 549篇 |
1968年 | 550篇 |
1967年 | 549篇 |
1966年 | 441篇 |
1965年 | 378篇 |
1964年 | 122篇 |
1959年 | 194篇 |
1958年 | 330篇 |
1957年 | 247篇 |
1956年 | 190篇 |
1955年 | 193篇 |
1954年 | 190篇 |
1948年 | 128篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Mehdi Shahedi Asl Abbas Sabahi Namini Seyed Ali Delbari Quyet Van Le Mohammadreza Shokouhimehr Mohsen Mohammadi 《自然科学进展(英文版)》2021,31(1):47-54
Sintering behavior of ZrB_2 ceramic with nano-sized SiC dopant was studied. ZrB_2-25 vol% nano-sized SiC was selected as the starting mixture to fabricate the composite. The manufacturing process was accomplished at 1800℃ for 5 min under 25 MPa via spark plasma sintering(SPS). The as-sintered sample reached a relative density of 99%. Besides the initial phases, namely ZrB_2 and SiC, the high-resolution X-ray diffraction(HRXRD) was used to study the formation of an in-situ ZrC phase. The possible chemical interactions during the ZrC phase formation were scrutinized. The microstructure of the composite was studied by the field emission scanning electron microscopy(FESEM) and transmission electron microscopy(TEM). Elemental analysis through FESEM evaluations revealed the formation of amorphous phases, rich in Zr, C, Si, B, and O elements, which was in harmony with the thermodynamical assessments. TEM studies endorsed the formation of such phases, containing a glassy bed of Si–B–O with ZrC and C islands dispersed therein. 相似文献
2.
杨建荣 《科技情报开发与经济》2004,14(6):157-158
根据我国当前电力系统运行情况,对电网无功功率补偿的必要性及通用补偿方法及其装置进行了具体阐述。 相似文献
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.
王永红 《科技情报开发与经济》2004,14(6):139-141
通过1998年、2000年的试验研究,系统分析了顶凌覆盖技术在高寒区节水增温保温、增产增收的机理及其应用效果。提出该技术可以缓解低温干旱特别是春旱对农业生产的困扰,是一项可以抗旱保春播增产增收的实用技术,在高寒地区具有较高的推广价值。 相似文献
5.
Alcaïs A Alter A Antoni G Orlova M Nguyen VT Singh M Vanderborght PR Katoch K Mira MT Vu HT Ngyuen TH Nguyen NB Moraes M Mehra N Schurr E Abel L 《Nature genetics》2007,39(4):517-522
Host genetics has an important role in leprosy, and variants in the shared promoter region of PARK2 and PACRG were the first major susceptibility factors identified by positional cloning. Here we report the linkage disequilibrium mapping of the second linkage peak of our previous genome-wide scan, located close to the HLA complex. In both a Vietnamese familial sample and an Indian case-control sample, the low-producing lymphotoxin-alpha (LTA)+80 A allele was significantly associated with an increase in leprosy risk (P = 0.007 and P = 0.01, respectively). Analysis of an additional case-control sample from Brazil and an additional familial sample from Vietnam showed that the LTA+80 effect was much stronger in young individuals. In the combined sample of 298 Vietnamese familial trios, the odds ratio of leprosy for LTA+80 AA/AC versus CC subjects was 2.11 (P = 0.000024), which increased to 5.63 (P = 0.0000004) in the subsample of 121 trios of affected individuals diagnosed before 16 years of age. In addition to identifying LTA as a major gene associated with early-onset leprosy, our study highlights the critical role of case- and population-specific factors in the dissection of susceptibility variants in complex diseases. 相似文献
6.
7.
Komen JC Distelmaier F Koopman WJ Wanders RJ Smeitink J Willems PH 《Cellular and molecular life sciences : CMLS》2007,64(24):3271-3281
Refsum disease is a rare, inherited neurodegenerative disorder characterized by accumulation of the dietary branched-chain
fatty acid phytanic acid in plasma and tissues caused by a defect in the alphaoxidation pathway. The accumulation of phytanic
acid is believed to be the main pathophysiological cause of the disease. However, the exact mechanism(s) by which phytanic
acid exerts its toxicity have not been resolved. In this study, the effect of phytanic acid on mitochondrial respiration was
investigated. The results show that in digitonin-permeabilized fibroblasts, phytanic acid decreases ATP synthesis, whereas
substrate oxidation per se is not affected. Importantly, studies in intact fibroblasts revealed that phytanic acid decreases both the mitochondrial
membrane potential and NAD(P)H autofluorescence. Taken together, the results described here show that unesterified phytanic
acid exerts its toxic effect mainly through its protonophoric action, at least in human skin fibroblasts.
Received 4 August 2007; received after revision 26 September 2007; accepted 10 October 2007
J. C. Komen, F. Distelmaier: These authors contributed equally to this work. 相似文献
8.
1 Results Oxy-apatite materials are thought as zirconia-substitutes in Solid Oxide Fuel Cells due to their fast ionic conduction. However, the well known difficulties related to their densification prevent them from being used as such. This study presents strategies to obtain oxy-apatite dense materials and the influence of elaboration route on transport properties. Particular emphasis is put on the microstructure effect on ion conduction. By the combined use of freeze-drying and conventional or spark p... 相似文献
9.
In agglomerative hierarchical clustering, pair-group methods suffer from a problem of non-uniqueness when two or more distances
between different clusters coincide during the amalgamation process. The traditional approach for solving this drawback has
been to take any arbitrary criterion in order to break ties between distances, which results in different hierarchical classifications
depending on the criterion followed. In this article we propose a variable-group algorithm that consists in grouping more
than two clusters at the same time when ties occur. We give a tree representation for the results of the algorithm, which
we call a multidendrogram, as well as a generalization of the Lance andWilliams’ formula which enables the implementation of the algorithm in a recursive
way.
The authors thank A. Arenas for discussion and helpful comments. This work was partially supported by DGES of the Spanish
Government Project No. FIS2006–13321–C02–02 and by a grant of Universitat Rovira i Virgili. 相似文献
10.