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   66166篇
  免费   9328篇
  国内免费   4698篇
电工技术   25051篇
技术理论   1篇
综合类   5946篇
化学工业   6231篇
金属工艺   1797篇
机械仪表   2816篇
建筑科学   4035篇
矿业工程   1885篇
能源动力   2744篇
轻工业   1739篇
水利工程   1932篇
石油天然气   2898篇
武器工业   528篇
无线电   8028篇
一般工业技术   4601篇
冶金工业   2301篇
原子能技术   1163篇
自动化技术   6496篇
  2024年   349篇
  2023年   989篇
  2022年   1840篇
  2021年   2258篇
  2020年   2571篇
  2019年   2164篇
  2018年   2106篇
  2017年   2726篇
  2016年   2806篇
  2015年   3148篇
  2014年   4476篇
  2013年   4454篇
  2012年   5147篇
  2011年   5410篇
  2010年   3861篇
  2009年   4141篇
  2008年   4017篇
  2007年   4505篇
  2006年   4116篇
  2005年   3217篇
  2004年   2702篇
  2003年   2350篇
  2002年   1906篇
  2001年   1639篇
  2000年   1360篇
  1999年   1102篇
  1998年   848篇
  1997年   663篇
  1996年   584篇
  1995年   506篇
  1994年   502篇
  1993年   366篇
  1992年   275篇
  1991年   229篇
  1990年   192篇
  1989年   158篇
  1988年   123篇
  1987年   86篇
  1986年   59篇
  1985年   55篇
  1984年   43篇
  1983年   30篇
  1982年   32篇
  1981年   11篇
  1980年   15篇
  1979年   8篇
  1977年   5篇
  1975年   5篇
  1959年   8篇
  1951年   9篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
The activation of safety valves causes the development of flow reaction forces that have to be transferred in an adequate way via the piping to the steel structure or via the connected vessel into the foundation. If the safety valve outlet piping is connected to a blowdown system or, in case of blowing off into the atmosphere, are equipped with a T‐piece at the outlet, the stationary reaction forces are compensated completely. The transient opening process, however, develops flow reaction forces which culminate in peaks of short duration. In this article, a simple method will be proposed for the estimation of the resulting reaction forces as a function of the length of the pipe at the safety valve outlet. CFD calculations and blowdown tests executed with a full‐lift safety valve have confirmed this method on principle. Special importance is attributed to the short duration of the effect of the reaction forces which seems to have only a negligible impact on the supporting steel structure.  相似文献   
2.
泌阳凹陷北部斜坡复杂断块群油田以断鼻、断块及断层+岩性油气藏为主,垂向含油层系多,平面上叠合连片,油气主要富集在鼻状构造主体部位的断鼻断块内。通过对研究区油气控制因素的分析,指出继承性的鼻状构造控制了油气聚集方向和富集程度,油气藏含油范围和油气藏高度则主要受断层封闭性和封闭程度的控制,油气分布规律受伸展构造所伴生的各种断块群构造型式的控制。  相似文献   
3.
基于高速分散的烟火药剂制备工艺   总被引:1,自引:1,他引:0  
探索高速分散的烟火药剂制备工艺,分析了高速分散制备工艺中的安全性。在实际应用中,此种工艺所制备的烟火药剂有燃烧精度高的优点。  相似文献   
4.
掺气减蚀保护作用的新概念   总被引:8,自引:0,他引:8  
利用针式掺气流速仪测量原型和模型掺气浓度场、流速场,气泡尺寸及其概率分布的研究成果表明,原型水流韦伯数高,形成微小气泡的能力比模型强,气泡上浮慢,接近底部的小尺寸气泡概率及掺气浓度比模型大。初步研究认为:0.2mm或0.5mm以下的微小气泡在掺气减蚀中起着主要作用,可能只要很小掺气浓度即可达到掺气减蚀的效果。因此以小尺寸气泡的掺气浓度,作为判断掺气减蚀保护作用的指标将更为准确。  相似文献   
5.
Analysis of non-stationary electrochemical oscillations emerges utilization of the techniques allowing an observation of time evolution of their parameters such as instantaneous frequency, amplitude or frequency band. An algorithm of extraction of these parameters can be based on one of linear or quadratic time-frequency representations of oscillations record. In this paper, the authors present representatives of such transformations (Choi-Williams and Cone-shaped) originating from one of the most popular joint time-frequency energy distribution—Wigner-Ville distribution. Short introduction to the mathematics of the topic discussed is provided, then the authors present an example of application in the analysis of current oscillations of copper dissolution process.  相似文献   
6.
In this work it is presented a study on the residence time distribution (RTD) of particles in a co-current pilot-plant spray dryer operated with a rotary atomization system. A nuclear technique is applied to investigate the RTD responses of spray dryers. The methodology is based on the injection of a radioisotope tracer in the feed stream followed by the monitoring of its concentration at the outlet stream. The experiments were performed during the drying of aqueous suspensions of gadolinium oxide. The RTD responses obtained experimentally presented good reproducibility, indicating that the technique applied is well suited to investigating fluid-dynamics of spray dryers. In addition to the experimental investigation, a mathematical model was used to describe the RTD experimental curves.  相似文献   
7.
Chemical Composition and Microstructure of Polymer‐Derived Glasses and Ceramics in the Si–C–O System. Part 2: Characterization of microstructure formation by means of high‐resolution transmission electron microscopy and selected area diffraction Liquid or solid silicone resins represent the economically most interesting class of organic precursors for the pyrolytic production of glass and ceramics materials on silicon basis. As dense, dimensionally stable components can be cost‐effectively achieved by admixing reactive filler powders, chemical composition and microstructure development of the polymer‐derived residues must be exactly known during thermal decomposition. Thus, in the present work, glasses and ceramics produced by pyrolysis of the model precursor polymethylsiloxane at temperatures from 525 to 1550 °C are investigated. In part 1, by means of analytical electron microscopy, the bonding state of silicon was determined on a nanometre scale and the phase separation of the metastable Si–C–O matrix into SiO2, C and SiC was proved. The in‐situ crystallization could be considerably accelerated by adding fine‐grained powder of inert fillers, such as Al2O3 or SiC, which permits effective process control. In part 2, the microstructure is characterized by high‐resolution transmission electron microscopy and selected area diffraction. Turbostratic carbon and cubic β‐SiC precipitate as crystallization products. Theses phases are embedded in an amorphous matrix. Inert fillers reduce the crystallization temperature by several hundred °C. In this case, the polymer‐derived Si–C–O material acts as a binding agent between the powder particles. Reaction layer formation does not occur. On the investigated pyrolysis conditions, no crystallization of SiO2 was observed.  相似文献   
8.
NMOS器件两次沟道注入杂质分布和阈电压计算   总被引:1,自引:1,他引:0  
王纪民  蒋志 《微电子学》1997,27(2):121-124
分别考虑了深浅两次沟道区注入杂质在氧化扩散过程中对表面浓度的贡献。对两次注入杂质的扩散分别提取了扩散系数的氧化增强系数、氧化衰减系数和有效杂地系数,给出了表面浓度与工艺参数之间的模拟关系式,以峰值浓度为强反型条件计算了开启电压,文章还给出了开启电压、氧化条件、不同注入组合之间的关系式。  相似文献   
9.
This article deals with the kinetics of two-step anionic polymerization by way of a non-steady state method. Several molecular parameters can be evaluated using the formulae developed. A bimodal molecular weight distribution function for the resulting polymer is derived from the set of kinetic differential equations, which is in agreement with the experimental data reported.  相似文献   
10.
本文运用一典型的人工神经网络模型─“反向传播”模型,对高氧化态(Ⅱ─Ⅳ)三核金属簇合物的构型分布进行了分析,得到了较好的分类、预报结果为化合物结构分析提供了新的工具。  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