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   1351篇
  免费   34篇
  国内免费   7篇
电工技术   31篇
综合类   2篇
化学工业   196篇
金属工艺   24篇
机械仪表   24篇
建筑科学   120篇
矿业工程   2篇
能源动力   58篇
轻工业   92篇
水利工程   18篇
石油天然气   6篇
武器工业   1篇
无线电   92篇
一般工业技术   178篇
冶金工业   260篇
原子能技术   6篇
自动化技术   282篇
  2023年   5篇
  2022年   12篇
  2021年   31篇
  2020年   9篇
  2019年   26篇
  2018年   25篇
  2017年   14篇
  2016年   35篇
  2015年   21篇
  2014年   30篇
  2013年   96篇
  2012年   78篇
  2011年   85篇
  2010年   72篇
  2009年   67篇
  2008年   71篇
  2007年   65篇
  2006年   63篇
  2005年   41篇
  2004年   33篇
  2003年   37篇
  2002年   40篇
  2001年   28篇
  2000年   16篇
  1999年   36篇
  1998年   55篇
  1997年   42篇
  1996年   29篇
  1995年   22篇
  1994年   31篇
  1993年   23篇
  1992年   15篇
  1991年   9篇
  1990年   16篇
  1989年   4篇
  1988年   8篇
  1987年   7篇
  1986年   5篇
  1985年   13篇
  1983年   4篇
  1982年   3篇
  1981年   4篇
  1980年   3篇
  1979年   5篇
  1978年   8篇
  1977年   12篇
  1976年   8篇
  1974年   5篇
  1973年   5篇
  1967年   5篇
排序方式: 共有1392条查询结果,搜索用时 15 毫秒
1.
2.
A model-based method for fault detection in tapping based on torque and radial forces is proposed. The method allows the identification of faults typical of a tapping operation including axial misalignment, tap runout, tooth breakage both singly and together. The validation experiments have been run on aluminum 356 workpieces for different combinations of process faults. Results have shown that the model predictions are in good agreement with the experimental radial force and torque signals under various fault conditions.  相似文献   
3.
Optimal ensemble construction via meta-evolutionary ensembles   总被引:1,自引:0,他引:1  
In this paper, we propose a meta-evolutionary approach to improve on the performance of individual classifiers. In the proposed system, individual classifiers evolve, competing to correctly classify test points, and are given extra rewards for getting difficult points right. Ensembles consisting of multiple classifiers also compete for member classifiers, and are rewarded based on their predictive performance. In this way we aim to build small-sized optimal ensembles rather than form large-sized ensembles of individually-optimized classifiers. Experimental results on 15 data sets suggest that our algorithms can generate ensembles that are more effective than single classifiers and traditional ensemble methods.  相似文献   
4.
Four experiments investigated the effect of recent selective practice on the cost of switching between 2 tasks afforded by letter-digit pairs: alphabet arithmetic and shape comparison. Experiments 1 and 2 found a greater cost associated with switching to the more recently practiced task: evidence that task-set inertia contributes to switching costs. Experiment 3 found this effect to be limited to trials on which a recently trained stimulus followed another such stimulus: a result problematic for all current theories of task-set priming. Experiment 4 showed that the effect of recent practice was eliminated by active preparation for a task switch: It appears that endogenous task-set preparation reduces the effects of task-set inertia. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
5.
Here, we describe the development of a reacting flow multi-species/combustion methodology, implemented as an extension to the differential reduced ejector analysis (DREA) computer program [Mathematical and computer modeling, vol. 31, 2000, p. 21; Appl. Math. Model. 25 (2001) 427; Comput. Math. Appl. 43(10–11); NASA Contractor Report, 1998]. Use of the single fluid IVP solver framework that was developed for the original DREA model has been directly coupled into the combustion formulation. With these modifications, the analysis has an elementary single step reaction Fuel+Oxidizer→Product combustion capability. Though approximate in nature, the simplicity and efficiency of the DREA formulation make it suitable for its original niche, namely design and preliminary design environments where more complex and expensive models may be inappropriate.  相似文献   
6.
In this paper we consider several variants of Valiant's learnability model that have appeared in the literature. We give conditions under which these models are equivalent in terms of the polynomially learnable concept classes they define. These equivalences allow comparisons of most of the existing theorems in Valiant-style learnability and show that several simplifying assumptions on polynomial learning algorithms can be made without loss of generality. We also give a useful reduction of learning problems to the problem of finding consistent hypotheses, and give comparisons and equivalences between Valiant's model and the prediction learning models of Haussler, Littlestone, and Warmuth (in “29th Annual IEEE Symposium on Foundations of Computer Science,” 1988).  相似文献   
7.
The cytosolic chaperonin containing TCP-1 (CCT) is known to keep fold cytoskeletal proteins and is involved in the proper organization of the cytoskeleton. These studies are based on the assumption that growth responses linked to structural rearrangement of the plant cytoskeleton include the action of CCT and the need for newly synthesized tubulin. The presence of the alpha- and epsilon-subunits of CCT was investigated in soluble fractions of protein extracts from maize mesocotyls and coleoptiles at distinct growth stages. The CCT-subunits, tubulins and actin decreased in the coleoptile in response to far-red light. In addition, independent from light treatment, the amount of CCT epsilon abundance declined with age in coleoptiles and mesocotyls between 2 and 4.5 days after sowing. In contrast to CCT epsilon, no significant light regulation of CCT alpha was found in the mesocotyl. In two day old, light-grown rapidly elongating coleoptiles part of the CCT alpha subunit and the bulk of actin and tubulin was found shifted into fractions of high molecular weight complexes when compared to slowly elongating, dark grown coleoptiles. In 4.5 day old, etiolated and elongating coleoptiles, part of both CCT-subunits and cytoskeleton proteins were found in fractions of high molecular weight. A complete disappearance of these polypeptides was observed in old far-red irradiated growth-arrested coleoptiles. CCT epsilon was found to be colocalized to microtubular structures and to the nucleus. We conclude from our data that abundance of CCT-subunits in soluble extracts is dependent on age and light treatment, but independent from the growth stage of mesocotyl and coleoptile.  相似文献   
8.
This paper describes an efficient technique for the design of fault-secure VLSI circuits based on differential cascode voltage switch (DCVS) logic. We propose a new synthesis method for constructing DCVS circuits with a near-optimal transistor count based on binary decision diagrams (BDDs). the time and memory resources required are very low, making the technique practical even for PC-based synthesis tools. This method is the basis for a CAD tool that allows automatic synthesis of fault-secure circuits based on the DCVS technology. We finally present an improved design and implementation of a 2's complement serial/parallel multiplier as an application of the proposed technique and algorithm.  相似文献   
9.
10.
激光二极管可能在数纳秒内自行毁坏,因此测试一个反馈稳定的激光二极管驱动器的响应和稳定性可能是费用很高的。图1所示仿真器电路示出了一个典型的激光二极管封装,封装内不仅有由电流1.驱动的激光二极管,而且还有一个光电二极管。激光二极管的前端面发射在外界起作用的主光束,而后端面则发射落到光电二极管上的参考光束。  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