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   25045篇
  免费   1677篇
  国内免费   1071篇
电工技术   644篇
综合类   1462篇
化学工业   1570篇
金属工艺   6333篇
机械仪表   2426篇
建筑科学   1257篇
矿业工程   472篇
能源动力   639篇
轻工业   929篇
水利工程   158篇
石油天然气   447篇
武器工业   130篇
无线电   526篇
一般工业技术   2232篇
冶金工业   7603篇
原子能技术   171篇
自动化技术   794篇
  2024年   98篇
  2023年   313篇
  2022年   588篇
  2021年   752篇
  2020年   802篇
  2019年   524篇
  2018年   494篇
  2017年   791篇
  2016年   787篇
  2015年   750篇
  2014年   1473篇
  2013年   1323篇
  2012年   1636篇
  2011年   1854篇
  2010年   1391篇
  2009年   1489篇
  2008年   1000篇
  2007年   1614篇
  2006年   1579篇
  2005年   1359篇
  2004年   1067篇
  2003年   922篇
  2002年   908篇
  2001年   790篇
  2000年   702篇
  1999年   585篇
  1998年   434篇
  1997年   387篇
  1996年   339篇
  1995年   267篇
  1994年   172篇
  1993年   157篇
  1992年   96篇
  1991年   65篇
  1990年   59篇
  1989年   76篇
  1988年   46篇
  1987年   25篇
  1986年   24篇
  1985年   9篇
  1984年   12篇
  1982年   11篇
  1981年   2篇
  1980年   6篇
  1978年   3篇
  1977年   1篇
  1976年   1篇
  1975年   3篇
  1974年   1篇
  1959年   4篇
排序方式: 共有10000条查询结果,搜索用时 7 毫秒
1.
Rectangular section control technology(RSCT)was introduced to achieve high-precision profile control during silicon steel rolling.The RSCT principle and method were designed,and the whole RSCT control strategy was developed.Specifically,RSCT included roll contour design,rolling technology optimization,and control strategy development,aiming at both hot strip mills(HSMs)and cold strip mills(CSMs).Firstly,through the high-performance variable crown(HVC)work roll optimization design in the upper-stream stands and the limited shifting technology for schedule-free rolling in the downstream stands of HSMs,a hot strip with a stable crown and limited wedge,local spot,and single wave was obtained,which was suitable for cold rolling.Secondly,an approximately rectangular section was obtained by edge varying contact(EVC)work roll contour design,edge-drop setting control,and closed loop control in the upper-stream stands of CSMs.Moreover,complex-mode flatness control was realized by coordinating multiple shape-control methods in the downstream stands of CSMs.In addition,the RSCT approach was applied in several silicon-steel production plants,where an outstanding performance and remarkable economic benefits were observed.  相似文献   
2.
本文介绍了柳钢冷轧板带厂1550 mm单机架平整机机前甩尾轧制的工艺。改进前轧制每卷钢卷生产效率低,钢卷成材率低,改进后生产效率、成材率明显提高,部分规格的钢卷能实现带尾剪切长度为零。  相似文献   
3.
The synergistic application of hot water dip at 42 °C for 30 min and 1% chitosan coating on differentiation in postharvest quality traits, microstructure as well as microbiological evolution of wolfberry fruits was investigated. Fresh wolfberry fruits were stored at 2 ± 0.5 °C and 90% relative humidity (RH) for 28 days. Results indicated the combination of prestorage heat treatment and chitosan coating maintained higher levels of ascorbic acid, total phenolic contents and antioxidant capacity as well as lower decay, compared with untreated wolfberry fruits. The possible mechanism was that the heat treatment almost sealed open stomata to limit the sites of pathogen penetration into fruits independently, followed by the biofilm formed by chitosan which controlled secondary infections as well as slowed changes in fruit respiration and metabolic activity in wolfberries. The synergistically treated fruit also exhibited a higher acceptability obtained by sensory analysis after cold storage. In this sense, the integrated application of heat treatment and chitosan coating could be regarded as an effective strategy to extend storage life and maintain the postharvest quality of wolfberry fruits.  相似文献   
4.
5.
轧制始极片     
本文介绍了轧制法生产始极片的工艺,比较了轧制法和传统的钛种板生产始极片的优缺点,讨论了采用轧制始极片的经济效益和应用前景。  相似文献   
6.
热镀锌板(卷)工程设计中的环境保护问题   总被引:1,自引:0,他引:1  
张传秀  倪晓峰 《冶金动力》2004,(5):54-57,63
对热镀锌板(卷)的生产工艺、主要生产设备进行了简要介绍,并就其污染源(工序)、生产过程中产生的污染物及其控制措施进行了评述,同时就设计和生产中宜注意的几个环保问题进行了分析。  相似文献   
7.
根据石油开采业对石油机械产品的需求 ,利用机械理论基础知识 ,通过实践设计 ,提出了对几何尺寸长的金属管类进行调质处理后的均匀冷却方法 ,以满足其性能要求。  相似文献   
8.
ABSTRACT: The traditional small-scale production of boucané, a cured smoked pork-belly product from Réunion, involves several unit operations that are performed in a single step. The aim of this study was to highligh the impact of 4 unit operations (salting, drying, cooking, and smoking) on stability, color, and flavor development in processed pork. These characateristics are the 3 main criteria of boucané's quality. Mass transfer, color, and volatile compounds were measured, analyzed, and compared in 4 products. Results indicated that a major quantity of volatile compounds detected in the processed meat were derived from the smoking process. Color variations were mainly explained by muscle pigment modification due to the cooking process, and by the input of volatile compounds of smoke.  相似文献   
9.
Behaviour of a series of lubricant oils and the effect of a non stoichiometric inorganic compound, as solid extreme pressure additive, on rolling fatigue life are studied using the rolling four-ball accelerated service simulation test proposed by Barwell and Scott. The results show, in all tested cases, the remarkable efficacy of this type of additive. The Total Acidity Number (tan) was found to increase with performance time for the case of the base lubricant, while for the oils with additives, it remained at its constant low value. This led to a proposal of a possible mechanism of the additive performance in the rolling process.  相似文献   
10.
分析了衬板槽平面与叉头十字轴孔轴线的相对位置对辊端接头应力的影响 ,研究了轧辊扁头与衬板之间间隙所产生的冲击和应力集中 ,讨论了辊端接头中部过渡段结构对应力分布和制造质量的影响。提出辊端接头结构设计的优化方案  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