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   24495篇
  免费   1588篇
  国内免费   609篇
电工技术   1133篇
技术理论   1篇
综合类   1758篇
化学工业   2593篇
金属工艺   1428篇
机械仪表   3163篇
建筑科学   1720篇
矿业工程   572篇
能源动力   365篇
轻工业   3078篇
水利工程   350篇
石油天然气   1084篇
武器工业   175篇
无线电   1170篇
一般工业技术   3314篇
冶金工业   997篇
原子能技术   350篇
自动化技术   3441篇
  2025年   221篇
  2024年   519篇
  2023年   474篇
  2022年   612篇
  2021年   784篇
  2020年   829篇
  2019年   643篇
  2018年   623篇
  2017年   699篇
  2016年   781篇
  2015年   735篇
  2014年   1310篇
  2013年   1429篇
  2012年   1638篇
  2011年   1479篇
  2010年   1317篇
  2009年   1349篇
  2008年   1147篇
  2007年   1466篇
  2006年   1387篇
  2005年   1179篇
  2004年   1092篇
  2003年   1002篇
  2002年   820篇
  2001年   665篇
  2000年   577篇
  1999年   478篇
  1998年   279篇
  1997年   237篇
  1996年   204篇
  1995年   147篇
  1994年   124篇
  1993年   81篇
  1992年   80篇
  1991年   59篇
  1990年   39篇
  1989年   33篇
  1988年   27篇
  1987年   22篇
  1986年   14篇
  1985年   15篇
  1984年   16篇
  1983年   18篇
  1982年   6篇
  1981年   7篇
  1980年   8篇
  1966年   3篇
  1961年   2篇
  1959年   3篇
  1951年   2篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
采用电子表格软件EXCEL5.0可以方便地解决许多选煤生产中的线性规划问题。本文通过选煤过程线性规划实例介绍EXCEL5.0在此领域的应用方法。  相似文献   
2.
Suspension cultures of tobacco cells were studied using airlift and rotary-drum bioreactors. The effect of initial concentrations of a major substrate, sucrose, on the growth and production of a secondary metabolite, phenolic compounds, was investigated. The dry weights and total concentrations of the phenolic compounds increased with the initial sucrose concentration in both bioreactors. Both bioreactors were found to have the same tendency for the effect of initial sucrose concentration. The structured model, presented previously was modified by considering that sucrose was hydrolyzed to glucose and fructose by an enzymatic reaction. The previous and the new models were applied to the above two sets of experimental data obtained with two bioreactors, independently. The hydrolysis of sucrose was elucidated to contribute slightly to the overall kinetics of growth and secondary metabolite production in these cultures. Furthermore, the levels of shear damage in each bioreactor were quantitatively compared based on the death rate constant, ki, which is one of the model constants.  相似文献   
3.
《Drying Technology》2007,25(12):1959-1965
Drying is an important unit operation in processing of foods and other biotechnological products. Vacuum freeze drying is said to be the best drying technology regarding product quality of the end product, but the disadvantages are, among others, expensive operational costs and batch drying. Atmospheric freeze drying was introduced to lower the production costs of high-quality dried foods, and the need of simulation tools became important in estimations of the industrial drying processes.

A simplified mathematical model (AFDsim) is developed based on uniformly retreating ice front (URIF) considerations. The model is used to calculate theoretical drying curves of atmospheric freeze dried foods in a tunnel dryer. Studies of thermal and mass transfer properties during drying are essential for understanding the changes in product quality and for designing and dimensioning the drying process. The model can be used to simulate industrial atmospheric freeze drying of different foodstuff in a tunnel. The results from AFDsim modeling are in good accordance with the experimental results.  相似文献   
4.
Quality and reliability design practitioners have utilized Taguchi's methodology of matrix experimentation to generate computer simulation data for characterizing performance variation of product designs. However, the sampling strategy employed renders computer implementation of matrix experimentation cumbersome and statistically invalid. Weaknesses of this approach also include sample size limitation and overestimation of performance variation. An alternative approach that combines Monte Carlo simulation with the strategies of independent sampling across runs and correlated sampling between runs is presented. An application case study shows that the proposed approach constitutes an improvement on the matrix approach with respect to statistical validity and estimation accuracy.  相似文献   
5.
6.
梁伟山 《化肥工业》2006,33(3):44-47
针对磷酸二铵(DAP)产品养分波动大、含水量偏高、易结块、颜色变化大等缺点,在生产过程中采取了相应的解决措施,如配矿、联产、设备改造、工艺指标调整等,使DAP装置不仅保持了原有的优点,而且产品质量问题也得到了有效解决。养分基本保持在64.0%~64.6%,水分下降到2.1%~2.2%,结块现象较少,颜色也比较统一。  相似文献   
7.
Concrete structures in main coal cleaning plants have been rebuilt and reinforced in the coal mines of the Shanghai Da-tun Energy Sources Co. Ltd., the first colliery of the Pingdingshan Coal Co. Ltd. and the Sanhejian mine of the Xuzhou Mining Group Co. Ltd. In these projects, the operating environment and reliability of concrete structures in the main plants of the three companies were investigated and the safety of the structures inspected. Qualitative and quantitative analyses were made on the spe-cial natural, technological and mechanical environments around the structures. On the basis of these analyses, we discuss the long-term, combined actions of the harsh natural (corrosive gases, liquids and solids) and mechanical environments on concrete structures and further investigated the damage and deteriorating mechanisms and curing techniques of concrete structures in the main coal cleaning plants. Our study can provide a theoretical basis for ensuring the reliability of concrete structures in main coal cleaning plants.  相似文献   
8.
It is well recognized that the impact-acoustic emissions contain information that can indicate the presence of the adhesive defects in the bonding structures. In our previous papers, artificial neural network (ANN) was adopted to assess the bonding integrity of the tile–walls with the feature extracted from the power spectral density (PSD) of the impact-acoustic signals acting as the input of classifier. However, in addition to the inconvenience posed by the general drawbacks such as long training time and large number of training samples needed, the performance of the classic ANN classifier is deteriorated by the similar spectral characteristics between different bonding status caused by abnormal impacts. In this paper our previous works was developed by the employment of the least-squares support vector machine (LS-SVM) classifier instead of the ANN to derive a bonding integrity recognition approach with better reliability and enhanced immunity to surface roughness. With the help of the specially designed artificial sample slabs, experiments results obtained with the proposed method are provided and compared with that using the ANN classifier, demonstrating the effectiveness of the present strategy.  相似文献   
9.
Let G1 and G2 be two connected graphs. The Kronecker product G1×G2 has vertex set V(G1×G2)=V(G1V(G2) and the edge set . In this paper, we show that if G is a bipartite graph with κ(G)=δ(G), then G×Kn(n?3) is super-κ.  相似文献   
10.
作为决策过程中一个重要的阶段性方法,在产品设计的教学中引入"scenario"方法是非常有意义的,它以自己独特的图象表达方法,生动有趣地引导学生积极主动地思考解决问题的办法,使学生不再像以前仅凭文字描述来凭空想像,而是以更加具象的图形故事作为彼此交流的媒介。  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