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   1541篇
  免费   47篇
电工技术   17篇
化学工业   146篇
金属工艺   30篇
机械仪表   19篇
建筑科学   61篇
矿业工程   27篇
能源动力   26篇
轻工业   173篇
水利工程   14篇
石油天然气   24篇
武器工业   1篇
无线电   208篇
一般工业技术   179篇
冶金工业   285篇
原子能技术   10篇
自动化技术   368篇
  2023年   9篇
  2022年   9篇
  2021年   23篇
  2020年   20篇
  2019年   25篇
  2018年   27篇
  2017年   40篇
  2016年   44篇
  2015年   34篇
  2014年   56篇
  2013年   84篇
  2012年   70篇
  2011年   106篇
  2010年   95篇
  2009年   77篇
  2008年   91篇
  2007年   85篇
  2006年   79篇
  2005年   66篇
  2004年   60篇
  2003年   63篇
  2002年   32篇
  2001年   31篇
  2000年   17篇
  1999年   26篇
  1998年   26篇
  1997年   26篇
  1996年   55篇
  1995年   29篇
  1994年   20篇
  1993年   17篇
  1992年   14篇
  1991年   5篇
  1990年   8篇
  1989年   11篇
  1988年   10篇
  1987年   13篇
  1986年   9篇
  1985年   11篇
  1984年   10篇
  1983年   5篇
  1982年   5篇
  1981年   7篇
  1980年   5篇
  1979年   3篇
  1978年   6篇
  1977年   7篇
  1976年   7篇
  1975年   2篇
  1965年   2篇
排序方式: 共有1588条查询结果,搜索用时 0 毫秒
1.
This paper discusses the future requirements of integrated construction management systems and the need to support the management of large volumes of information on several levels. The solution proposes a combination of an efficient user interface and methods to partially automate the creation of the required information through access to stored information from past projects. The research follows the path being established for integrated construction management systems that rely on a standard representation of the industry's information requirements. By exploring the comprehensive aspects of construction planning for an integrated construction management system, the research demonstrates the usefulness of applying sound information representation structures. Through the application of case-based reasoning, the research advances the concepts of planning tools as they apply to integrated systems. The resulting prototype construction management system has the primary characteristic of assisting the user in the manipulation of information in order to generate the initial information requirements of an integrated construction management system.  相似文献   
2.
消费电子和通信产业正见证着I/O解决方案从并行到高速串行的转变:能够降低成本、简化设计,并具备可延展性,满足全新带宽的要求。这类接口I/O技术的市场潜力巨大,包括移动电话、DVD-RW和高清晰度LCD电视机,而低功耗、低电磁干扰(EMI)和高数据吞吐量在这些应用中极为重要。因此,业界一直致力于设计和开发这些串行I/O,以低功耗提供高速的数据速  相似文献   
3.
ABSTRACT: The effectiveness of 3 carbohydrases for protein extraction from heat-stabilized defatted rice bran (HDRB) was evaluated. Amylase, viscozyme and celluclast extracted a maximum of 45.4, 12.1, and 28.5% protein, respectively. Further study showed that extracted protein ranged from 9.5 to 58.4% under conditions of water to bran ratio (5:1 to 20:1), α-amylase (0 to 110000 units/10 g rice bran), temperature (35 to 55 °C), and time (1 to 8 h). The maximum protein extracted was 58.4% with a water to bran ratio of 17:1, 87637 units amylase, and 50.9 °C. These results suggest that impure food-grade amylase containing protease is more effective than celluclast and viscozyme in protein extraction from HDRB.  相似文献   
4.
Effects of constant voltage stress (CVS) on gate stacks consisting of an ALD HfO2 dielectric with various interfacial layers were studied with time dependent sensing measurements: DC IV, pulse IV, and charge pumping (CP) at different frequencies. The process of injected electron trapping/de-trapping on pre-existing defects in the bulk of the high-κ film was found to constitute the major contribution to the time dependence of the threshold voltage (Vt) shift during stress. The trap generation observed with the low frequency CP measurements is suggested to occur within the interfacial oxide layer or the interfacial layer/high-κ interface, with only a minor effect on Vt.  相似文献   
5.
6.
7.
8.
In target detection tasks, responses are faster when displays have 2 targets (redundant-targets effect; RTE) and slower when they have no targets (nontargets effect; NTE) relative to displays with a single target. The psychological refractory period paradigm was used to localize these effects. In Experiment 1, participants classified tones as high or low and then classified letters as targets or nontargets after a short or long stimulus onset asynchrony (SOA). The magnitudes of the RTE and NTE did not depend on SOA. In Experiment 2, the order of the tasks was reversed, and at short SOAs the RTE and NTE had similar magnitudes for both tone discrimination and target detection responses. These findings suggest that the RTE and NTE arise during response selection. Interactive effects of tone pitch with the number and type of target features were also observed, and these were tentatively interpreted as synesthetic effects. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
9.
Four studies involving 573 female and 272 male college students demonstrated that multiple forms and measures of aggression were associated with high levels of sensation seeking, impulsivity, and a focus on the immediate consequences of behavior. Multiple regression analyses and structural equation models supported a theoretical model based on the general aggression model (C. A. Anderson & B. J. Bushman, 2002), positing that hostile cognition and negative affect mediate the relationships between the aforementioned individual differences and aggression. Sensation seeking also predicted a desire to engage in physical and verbal aggression. The final study demonstrated that relative to those scoring low, individuals scoring high on the consideration of future consequences are only less aggressive when aggression is likely to carry future costs. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
10.
<正> 对一个团队和组织来说,创造一个有效的规划是最具挑战性的任务之一。规划在这里不是指几个简单的句子,而是一种对未来状态的彻底的清晰认识,它包括对价值观、步骤、结构、技术、工作角色和环境的明确认识。但问题是:需要采取什么样的步骤才能为自己的组织创造一个有效和可行的规划呢?本文介绍的模块提供了一些基本的步骤,它们能大大提高创造一个有效的规划的可能性。  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