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   23011篇
  免费   2510篇
  国内免费   1437篇
电工技术   659篇
综合类   1299篇
化学工业   5941篇
金属工艺   1918篇
机械仪表   1255篇
建筑科学   1325篇
矿业工程   978篇
能源动力   763篇
轻工业   1648篇
水利工程   483篇
石油天然气   629篇
武器工业   204篇
无线电   1191篇
一般工业技术   3288篇
冶金工业   1481篇
原子能技术   295篇
自动化技术   3601篇
  2024年   64篇
  2023年   351篇
  2022年   646篇
  2021年   736篇
  2020年   809篇
  2019年   765篇
  2018年   704篇
  2017年   916篇
  2016年   917篇
  2015年   940篇
  2014年   1351篇
  2013年   1732篇
  2012年   1567篇
  2011年   1914篇
  2010年   1264篇
  2009年   1506篇
  2008年   1334篇
  2007年   1407篇
  2006年   1341篇
  2005年   1088篇
  2004年   845篇
  2003年   775篇
  2002年   657篇
  2001年   510篇
  2000年   431篇
  1999年   449篇
  1998年   340篇
  1997年   302篇
  1996年   191篇
  1995年   174篇
  1994年   177篇
  1993年   123篇
  1992年   98篇
  1991年   96篇
  1990年   84篇
  1989年   71篇
  1988年   51篇
  1987年   36篇
  1986年   28篇
  1985年   24篇
  1984年   22篇
  1983年   16篇
  1982年   11篇
  1981年   12篇
  1980年   7篇
  1979年   6篇
  1978年   6篇
  1964年   7篇
  1959年   8篇
  1951年   11篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
The objective of the present study is to develop multi-functioned coating to the components, which are made of copper with electroplated Ni and are widely used for steel making industry. In this paper, we report the mechanical and thermal properties of Ni based superalloys with carbide sprayed by high velocity oxygen fuel (HVOF), and the detailed effects of sprayed material, spraying conditions, and initial powder structure on these properties. It was found that, among commercial Ni self-fluxing alloys (without fusing treatment), coating with a carbon content of 0.58 mass% had the most preferable properties, with a good balance of the hardness, strength, and thermal shock resistance. The thermal shock resistance depended not only on the strength of the coating but also on the volume contraction when tested at high temperatures. For the several developed Ni based superalloys with carbide, Ni20Cr8Mo5Fe–WC and Ni16Cr15Mo3–WC demonstrated the prominent adhesion strength and thermal shock resistance with high Galvanic corrosion resistance through optimized spraying condition. Also, 20 mass% NiCr–Cr3C2 coating sprayed by using employed relatively small primary particle succeeded in achieving the multi-superior properties; high adhesion strength, high corrosion resistance and thermal shock resistance.  相似文献   
102.
介绍了利用高炉鼓风机基础实施不易地扩容改造的设计工艺方法,该方法不仅降低了设计、施工、安装费用,而且缩短了施工周期,降低了固定资产投资。  相似文献   
103.
Recent developments of high-performance NEOMAX magnets   总被引:6,自引:0,他引:6  
For further improvement in achieving extremely high magnetic properties of Nd- Fe- B sintered magnets, extensive investigation has been done to densify the magnet up to the theoretical value, to increase the volume fraction of the Nd 2Fe14B matrix phase, and to achieve a high degree of alignment. By controlling chemical composition and the amount of constituent phases,improving particle size distribution, and adopting the isostatic pressing method to get better alignment of fine particles, we have succeeded in obtaining a high-performance magnet having residual flux density (Br) of 1.495 T (14.95 kG), maximum energy product [(BH)max] of 431 kj/m3 (54.2 MGOe), and intrinsic coercivity (iHc) of 845 kA/m (10.62 kOe).  相似文献   
104.
In close-coupled gas atomization(CCGA), the influences of melt superheat on breakup process are fundamental to obtain desired or finer powder. Based on a series of Cu atomization experiment under different superheating conditions, the influences of melt superheat on breakup process were studied. Experimental results indicate that as the melt superheat is increased to 150, 200, 250 and 300 K, the mean particle size (D50) decreases consequently to 34.9, 32.3, 30.9 and 19.7 μm. Theoretical analysis reveals that the primary breakup and secondary breakup processes are close coupled, and the melt superheat radically influences the melt properties, and plays a crucial role on governing the filming process of primary breakup and the atomization modes of secondary breakup. There exists a strong nonlinear decrease of contact angle of melt to nozzle orifice wall when the superheat is increased fi'om 250 K to 300 K, leading to a marked fall of the film thickness formed in primary breakup, and D50 of copper powders is therefore sharply reduced. However, the log-normal distribution feature of particle size has not been substantially improved.  相似文献   
105.
A new method of characterization for stratified thermal energy stores   总被引:1,自引:0,他引:1  
A new method for characterization of stratified thermal energy stores (TES) that integrates both the first law and the second law concerns is presented here. The first law concern is incorporated into a quantity called energy response factor and the second law concern into an entropy generation ratio. A product of these two quantities is at the heart of the TES efficiency definitions. This approach removes the overemphasis of the existing methods either on the first or the second law of thermodynamics which often biases the characterization results. The information about the evolution of the temperature field of the system in time is the prerequisite of the new method. It may be obtained from experiments or from suitable numerical simulations. The current method can be easily integrated into computational fluid dynamic (CFD) simulations and thus facilitate CFD-based design analysis. As an example of such CFD-integrated analysis, a large-scale hot water seasonal heat store is numerically studied to identify the effects of aspect ratio, containment shape, internal structures, and containment size on their efficiency. The results suggest the effectiveness of the new method in deriving useful design insights.  相似文献   
106.
Haze measurements have been obtained for suspensions of polystyrenelatex particles of known diameter using two light scattering instruments which measure at angles of 90° and 13° respectively. The results agree well with the theory of light scattering and demonstrate the significant effects of particle size and angle of detection upon the instrumental values for haze. This information has been used to correlate the particle size distributions of a number of beers, as measured by Coulter Counter, with the corresponding, measured haze values.  相似文献   
107.
杨占尧 《锻压技术》2002,27(2):31-33
通用的回转体拉深件毛坯直径的计算公式繁琐,不蝗记忆,特别是利用中线尺寸常出现小数点使计算复杂,本文针对此问题分别推导出了利用中线尺寸和不用中线尺寸时,毛坯直径的简捷计算公式。并进行了误差分析,最后用实例对简捷计算方法的正确性给予了验证。  相似文献   
108.
用于重离子核反应实验测量的纵向电场气体电离室   总被引:1,自引:0,他引:1  
本文报道了一种新型的大动态范围,多叠层探测器系统组件之一的纵向电场气体电离室的构造,性能和在中能得离子核反应实验中的应用。  相似文献   
109.
大中型风力发电机组可靠性研究   总被引:6,自引:2,他引:4  
研究了大中型风力发电机组的可靠性,讨论了可靠性指标的分配,可靠性设计的四个重要方面、可靠性试验计算机模拟。  相似文献   
110.
The influence of metal particle size of monometallic and bimetallic supported catalysts (Au, Pd, Au–Pd)/C was studied using as a model reaction the liquid phase oxidation of glycerol. By tuning the metal particle size from 2 to 16 nm a progressive decrease of activity and simultaneously an increase in the selectivity to sodium glycerate was observed. Moreover, the influence of the temperature was studied and it was found that by increasing the temperature, only with a large particle size the formed glycerate was retained and not over-oxidized to tartronate.  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