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   74367篇
  免费   10602篇
  国内免费   3031篇
电工技术   3645篇
技术理论   2篇
综合类   4614篇
化学工业   9997篇
金属工艺   5557篇
机械仪表   3764篇
建筑科学   2308篇
矿业工程   2960篇
能源动力   1946篇
轻工业   4272篇
水利工程   811篇
石油天然气   12150篇
武器工业   641篇
无线电   15797篇
一般工业技术   11117篇
冶金工业   3573篇
原子能技术   786篇
自动化技术   4060篇
  2025年   686篇
  2024年   2548篇
  2023年   2326篇
  2022年   2113篇
  2021年   2805篇
  2020年   3101篇
  2019年   3004篇
  2018年   2438篇
  2017年   2886篇
  2016年   3017篇
  2015年   2863篇
  2014年   4021篇
  2013年   4530篇
  2012年   5002篇
  2011年   5050篇
  2010年   3378篇
  2009年   3608篇
  2008年   3460篇
  2007年   3987篇
  2006年   4068篇
  2005年   3574篇
  2004年   3036篇
  2003年   2894篇
  2002年   2252篇
  2001年   2020篇
  2000年   1815篇
  1999年   1405篇
  1998年   1169篇
  1997年   945篇
  1996年   816篇
  1995年   673篇
  1994年   603篇
  1993年   403篇
  1992年   312篇
  1991年   288篇
  1990年   235篇
  1989年   182篇
  1988年   77篇
  1987年   64篇
  1986年   51篇
  1985年   51篇
  1984年   56篇
  1983年   39篇
  1982年   50篇
  1981年   31篇
  1980年   13篇
  1979年   8篇
  1976年   9篇
  1975年   9篇
  1951年   8篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
4-Amino-3-thio-1,24-triazolidine (L1) and 4-amino-5-thio-1,3,4-thiadiazole (LII) as well as their metal complexes of the general formulae MLI·2H2O and MLIICl (M; Pb(II), Cd(II) and Zn(II)) were prepared. With Sn(II), we obtained Sn(LI)2·2H2O and SnLIICl, respectively. The structures of the compounds were identified through elemental analysis, and IR and UV spectra measurements, in addition to thermal analysis in case of the metal complexes. The antifouling properties of the compounds were tested by their incorporation into paint formulations which were applied to PVC substrates and tested in water from Alexandria western harbour. When the compounds were added at 17·5% by volume, the coated panels were fouled after 3 months of immersion. The addition of 6·7% by volume of tributyltin oxide to 15·8% of the prepared compounds in one formulation elevated the paint efficiency and prevented fouling for 11 months. Paint containing solely tributyltin oxide at the same concentration was inactive against algae.  相似文献   
3.
A simple measurement system is described for evaluating damage to graphite-epoxy panels, such as those used in high-performance aircraft. The system uses a heating laser and infrared imaging system to measure thermal performance. Thermal conductivity or diffusivity is a sensitive indicator of damage in materials, allowing this thermal measurement to show various degrees of damage in graphite-epoxy composites. Our measurements track well with heat-flux damage to graphite epoxy panels. This measurement system, including analysis software, could easily be used in the field, such as on the deck of an aircraft carrier or at remote air strips.  相似文献   
4.
A number of copolymers were synthesised by condensing the 2,4-dinitrophenylhydrazone of resacetophenone with substituted benzoic acids/ phenols and formaldehyde in the presence of sodium hydroxide or hydrochloric acid. The decomposition temperature, solubility and viscosity of the polymers have been determined. The ion-exchange properties have been studied by using a batch equilibrium method. The distribution of a number of metal ions between an aqueous solution and the resin have been measured. A wide range of pH and variable ionic strengths have been investigated.  相似文献   
5.
External magnetic disturbance influences the quality of the image obtained with a magnetic resonance imaging (MRI) system because it causes magnetic resonance frequency drift. When a superconducting magnet in persistent current mode operation is exposed to external magnetic disturbance coil current varies to keep linkage flux constant. Conventional analysis is usually formulated with constant current and does not provide correct evaluation of drift of magnetic field in the magnet. This paper proposes a method of numerical analysis of magnetic field considering conservation of linkage flux in a superconducting magnet under a persistent current mode operation. This method is applied to evaluate drift of the magnetic field in a superconducting magnet for magnetic resonance imaging due to external magnetic disturbance. Analysis results show good agreement with the experimental results.  相似文献   
6.
Fluorans are given considerable attention as functional dyes for heat-and/or pressure-sensitive recording media. Numerous potential metal complexes were synthesised to prolong the life of coloured species. The protecting effect of these compounds against the photofading was examined on cellulose. It was found that the zinc or nickel salts of 3,5-dihydroxy-2-naphthoic acid and its derivatives can be applied as effective stabilisers against the fading of fluoran dyes.  相似文献   
7.
我国金属阳极隔膜法烧碱发展现状与对策   总被引:1,自引:0,他引:1  
刘自珍 《中国氯碱》2003,(12):1-4,12
详细介绍了我国氯碱工业采用金属阳极隔膜法制烧碱的现状及与世界先进水平的差距。提出了包括大力进行以节能为重点的技术改造;调整烧碱产品规格;彻底淘汰和转换石墨阳极隔膜法;推广先进的扩张金属阳极隔膜电解技术以及结合我国国情有计划地发展离子膜法制烧碱技术等改造措施及预期效果。  相似文献   
8.
Reserve estimation is a key to find the correct NPV in a mining project. The most important factor in reserve estimation is the metal price. Metal price fluctuations in recent years were exaggerated, and imposed a high degree of uncertainty to the re-serve estimation, and in consequence to the whole mine planning procedure. Real option approach is an efficient method of deci-sion making in the uncertain conditions. This approach has been used for evaluation of defined natural resources projects until now. This study considering the metal price uncertainty used real option approach to prepare a methodology for reserve estimation in open pit mines. This study was done on a copper cylindrical deposit, but the achieved methodology can be adjusted for all kinds of deposits. This methodology was comprehensively described through the examples in such a manner that can be used by the mine planners.  相似文献   
9.
使用密度泛函理论方法研究了量子点(CdSe)2与配体L(L=PH3、PH2Me、PHMe2、PMe3、NH3、NH2Me、NHMe2、NMe3)之间的相互作用及其产物的结构和性质。配体中的P或N原子与Cd原子上分别形成较强的Cd—P和Cd—N配位键,从而影响(CdSe)2的结构和电子性质。配体作用下,(CdSe)2的几何结构、电荷分布、轨道能级、吸收光谱等均发生变化,但2类配体的影响,尤其是甲基数目的影响,存在较大差异。  相似文献   
10.
以双量子位Heisenberg模型为例,讨论了磁场方向对纠缠的影响。结果表明:一定温度下,保持磁场的大小不变,仅改变其方向,不仅能获得最大纠缠,还产生了量子相变。  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