首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   41623篇
  免费   4564篇
  国内免费   2392篇
电工技术   3195篇
技术理论   2篇
综合类   3596篇
化学工业   5484篇
金属工艺   2384篇
机械仪表   3165篇
建筑科学   3548篇
矿业工程   1499篇
能源动力   1391篇
轻工业   3952篇
水利工程   1005篇
石油天然气   1466篇
武器工业   485篇
无线电   4959篇
一般工业技术   3628篇
冶金工业   1895篇
原子能技术   420篇
自动化技术   6505篇
  2024年   174篇
  2023年   600篇
  2022年   1428篇
  2021年   1897篇
  2020年   1471篇
  2019年   1071篇
  2018年   1188篇
  2017年   1425篇
  2016年   1241篇
  2015年   1982篇
  2014年   2505篇
  2013年   2989篇
  2012年   3674篇
  2011年   3687篇
  2010年   3376篇
  2009年   3162篇
  2008年   3105篇
  2007年   2795篇
  2006年   2258篇
  2005年   1601篇
  2004年   1210篇
  2003年   1076篇
  2002年   1122篇
  2001年   1010篇
  2000年   568篇
  1999年   398篇
  1998年   328篇
  1997年   253篇
  1996年   224篇
  1995年   141篇
  1994年   103篇
  1993年   120篇
  1992年   63篇
  1991年   43篇
  1990年   32篇
  1989年   20篇
  1988年   25篇
  1987年   13篇
  1986年   15篇
  1985年   10篇
  1984年   7篇
  1983年   6篇
  1982年   7篇
  1981年   14篇
  1980年   15篇
  1979年   7篇
  1978年   3篇
  1977年   33篇
  1976年   74篇
  1959年   4篇
排序方式: 共有10000条查询结果,搜索用时 17 毫秒
71.
热释电红外摄像机斩波调制电路的设计   总被引:1,自引:0,他引:1  
郑康  荣德康 《光电子技术》1996,16(3):240-245
本文提出了热释电红外摄像机斩波调制的电路模型,并对此电路模型进行了具体的电路设计和分析。  相似文献   
72.
The relationship of a member of the transmembrane dystrophin-associated glycoprotein (DAG) complex to acetylcholine receptors (AChRs) was investigated using immunofluorescence techniques at rat neuromuscular junctions (NMJs) viewed en face. These results were compared with those from a similar previous study of dystrophin and an autosomal homologue (utrophin or dystrophin-related protein, DRP) (Bewick et al. Neuro Report 1992; 3: 857-860). The region of highest 43 K DAG (43DAG) labelling projected beyond the AChRs by approximately 0.3 microns, as does that for dystrophin. By contrast DRP labelling precisely co-localizes with the AChRs. These results suggest that at the NMJ, the region of high 43DAG concentration encompasses the area of highest intensity labelling for both DRP and dystrophin.  相似文献   
73.
The inhibitory effect of alpha-tocopherol on methemoglobin formation in normal and acatalasemic mice was studied by exposing their hemolysates to nitric oxide. Methemoglobin formation in normal and acatalasemic mouse hemolysates exposed to nitric oxide were significantly inhibited by the addition of alpha-tocopherol at final concentrations ranging from 1.2 to 5.8 mM. Negative correlations were observed between the logarithm of alpha-tocopherol concentration and the methemoglobin formation. The formation of methemoglobin in acatalasemic mouse hemolysates was greater than that in normal mouse hemolysates with or without added alpha-tocopherol. The methemoglobin formation in acatalasemic mice was also significantly inhibited by addition of more than 500 units/ml of catalase, and the methemoglobin formation in normal and acatalasemic mice was also inhibited with sodium diethyldithiocarbamate at a final concentration of 1 M.  相似文献   
74.
We compared the data from four growth hormone (GH) immunoassays for analyzing 24-h GH profiles in four apparently normal subjects and four obese subjects (508 serum samples). The detection limit was 0.02 microgram/L for one immunochemiluminometric assay (ICMA), 0.1 microgram/L for two IRMAs, and 0.4 microgram/L for one RIA. All GH pulses with a peak ICMA value > 1 microgram/L were detected by each of the other methods. Overall, the correlation coefficient between the values obtained with all four assays exceeded 0.90. However, for GH concentrations < or = 0.25 microgram/L, acceptable concordance (r2 > or = 0.80) was reached only between the ICMA and one IRMA; between the ICMA and the RIA, concordance was acceptable only for GH concentrations > or = 10 micrograms/L. In the normal subjects, the percentage of undetectable values was 0% with the ICMA but 29% with one of the IRMAs; in obese subjects, the corresponding values were 12% and 38%.  相似文献   
75.
Studied in the course of one-stage epidemiologic survey of 1191 individuals were the threshold of gustatory sensitivity to table salt and nycterine natriuresis, relation of these indices to dietary habits, some risk factors for cardiovascular disorders and clinical parameters. Differing relations were established between gustatory sensitivity to table salt and natriuresis and age and gender of the examinees, the level of blood pressure, aggravated heredity in respect of arterial hypertension, smoking and alcohol abuse, this enabling one to embark upon a differential approach to dietetic correction of salt consumption.  相似文献   
76.
77.
The effect of annealing on microstructure,adhesive and frictional properties of GeSb 2 Te 4 films were experimentally studied.The GeSb 2 Te 4 films were prepared by radio frequency(RF)magnetron sputtering,and annealed at 200℃and 340℃under vacuum circumstance,respectively.The adhesion and friction experiments were mainly conducted with a lateral force microscope(LFM)for the GeSb 2 Te 4 thin films before and after annealing.Their morphology and phase structure were analyzed by using atomic force microscopy(AFM)and X-ray Diffraction(XRD)techniques,and the nanoindention was employed to evaluate their hardness values.Moreover,an electric force microscope(EFM)was used to measure the surface potential. It is found that the deposited GeSb 2 Te 4 thin film undergoes an amorphous-to-fcc and fcc-to-hex structure transition;the adhesion has a weaker dependence on the surface roughness,but a certain correlation with the surface potential of GeSb 2 Te 4 thin films.And the friction behavior of GeSb 2 Te 4 thin films follows their adhesion behavior under a lower applied load.However,such a relation is replaced by the mechanical behavior when the load is relatively higher.Moreover,the GeSb 2 Te 4 thin film annealed at 340℃presents a lubricative property.  相似文献   
78.
静电复印机是常用的办公设备,复印时要将不同规格的复印纸装入纸盒,经常需要操作者对纸盒进行调整。从使用者的角度讲,要用最小的力气、最简便的方法来完成对机器的操纵。这就需要考虑进行人性化设计。纸盒调整主要有自动监测纸盒尺寸的功能和纸盒内侧挡板(导纸板)的调整。对比不同品牌和不同机型复印机的纸盒设计,可看出人性化设计对方便操作者使用的重要性,也为购买机器时提供了借鉴。  相似文献   
79.
硅丙乳液及其建筑涂料的制备和性能研究   总被引:7,自引:0,他引:7  
先将乙烯基有机硅单体及环状有机硅单体在碱催化下,合成有机硅预聚体,再与丙烯酸酯进行共聚制得硅丙乳液及其建筑涂料。研究了有机硅加入形式、有机硅中间体分子量、有机硅加入量等因素对硅丙乳液及其涂料性能的影响,并与相应的纯丙体系进行比较。结果表明,采用分子量较小的有机硅中间体,有机硅用量为10%左右时所制得的乳液及涂料性能优异,对丙烯酸酯的改性效果明显。  相似文献   
80.
将小波变换和马氏距离相结合,提出了一种基于ISAR成像的雷达目标特征提取方法。对ISAR成像数据进行正交二进Symlet小波分解和门限处理,对数据进行压缩,然后计算压缩后坐标点的马氏(Mahalanobis)距离,得到目标稳定的特征向量。由实验结果看出,此向量具有在一定范围内的不变性,能够用于雷达目标识别。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号