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   3354篇
  免费   121篇
  国内免费   48篇
电工技术   26篇
综合类   784篇
化学工业   122篇
金属工艺   69篇
机械仪表   92篇
建筑科学   1385篇
矿业工程   39篇
能源动力   11篇
轻工业   22篇
水利工程   47篇
石油天然气   9篇
无线电   90篇
一般工业技术   65篇
冶金工业   265篇
原子能技术   3篇
自动化技术   494篇
  2024年   4篇
  2023年   19篇
  2022年   44篇
  2021年   49篇
  2020年   40篇
  2019年   26篇
  2018年   25篇
  2017年   38篇
  2016年   52篇
  2015年   75篇
  2014年   241篇
  2013年   156篇
  2012年   188篇
  2011年   231篇
  2010年   245篇
  2009年   250篇
  2008年   234篇
  2007年   283篇
  2006年   244篇
  2005年   214篇
  2004年   163篇
  2003年   156篇
  2002年   132篇
  2001年   77篇
  2000年   65篇
  1999年   38篇
  1998年   22篇
  1997年   31篇
  1996年   8篇
  1995年   12篇
  1994年   7篇
  1993年   5篇
  1992年   6篇
  1991年   7篇
  1990年   11篇
  1989年   7篇
  1987年   5篇
  1986年   6篇
  1984年   4篇
  1976年   4篇
  1971年   4篇
  1966年   4篇
  1965年   4篇
  1963年   6篇
  1962年   4篇
  1961年   4篇
  1958年   7篇
  1957年   9篇
  1955年   13篇
  1954年   6篇
排序方式: 共有3523条查询结果,搜索用时 31 毫秒
1.
在社会转型期,面对日益激烈的市场竞争环境,如何制定民办高效发战战略,引导民办高效的可持续发展,是关系到民办高校兴衰的关键。本文主要从民办高校品牌战略入手,对社会转型及高等教育转型进行论述,并对如何加强民办高校品牌建设进行探讨。  相似文献   
2.
乡镇供水作为水利开发建设中的一个新领域,设计工作是龙头,有许多技术问题需要研究和探索,阐述了乡镇供水工程设计应注意的若干问题,并对设计中存在的一些具体问题进行了分析和探讨。  相似文献   
3.
There are many ways in which quantitative decision models can be applied in project management. The introduction of a project evaluation review technique network model to the development of a school education service in the city of Delhi, India, is described. The reasons for choosing this method, its advantages and limitations are discussed. Examples of the information obtained from the model are presented and explained.  相似文献   
4.
The authors examined predictors of teachers' ratings of academic competence of 105 kindergarten children from low-income families. Teachers rated target children's expected competence in literacy and math and completed questions about their perceptions of congruence-dissonance between themselves and the child's parents regarding education-related values. Independent examiners assessed children's literacy and math skills. Teachers' instructional styles were observed and rated along dimensions of curriculum-centered and student-centered practices. Controlling for children's skills and socioeconomic status, teachers rated children as less competent when they perceived value differences with parents. These patterns were stronger for teachers who exhibited curriculum-centered, rather than student-centered, practices. The findings suggest a mechanism by which some children from low-income families enter a path of diminished expectations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
5.
Halo effects in rating specific pieces of work, as in educational grading, have received little attention. Grades awarded by 2 independent graders to undergraduate projects were analyzed with a correlated uniqueness model. Grades showed substantial halo despite being awarded by expert assessors at the time of reading the work. There was greater halo between different grades applying to the same section of the project than between grades applying to different sections. Supervisors who had regular contact with the student whose work they were grading showed no more halo than other graders. More reliable graders showed less within-section halo than graders of lower reliability but equal between-sections halo. The halo effects observed cannot be entirely attributable to a unitary general impression. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
6.
Longitudinal data from a representative sample of 1,978 Black and White adolescents were used to examine the role of personality in multiple risk or problem behaviors. Results indicate that covariation among diverse behaviors (educational underachievement, delinquent behavior, substance use, sexual behavior) can be adequately modeled by a single higher order factor, and that impulsivity and avoidance coping serve as generalized risk factors for involvement in these behaviors. Whereas none of the personality variables examined explained change in problem behaviors once established, avoidance coping prospectively predicted involvement among a subgroup of adolescents with little or no prior involvement. Results suggest that dysfunctional styles of regulating emotions and emotionally driven behaviors are core features of risky or problem behaviors during adolescence. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
7.
上海市松江新城突进式发展的体制创新与探索   总被引:2,自引:0,他引:2  
本文用理论和现实的案例分析详细阐述了“经营城市”的六项特征和“三赢”的理念 ,简要介绍了松江新城在财政不出一分钱的情况下为取得突进式发展所采取的制度创新和探索 ,并总结了两点如何树立规划权威性的经验。  相似文献   
8.
This paper describes how SWoRD (scaffolded writing and rewriting in the discipline), a web-based reciprocal peer review system, supports writing practice, particularly for large content courses in which writing is considered critical but not feasibly included. To help students gain content knowledge as well as writing and reviewing skills, SWoRD supports the whole cycle of writing, reviews, back-reviews, and rewriting by scaffolding the journal publication process as its authentic practice model. In addition, SWoRD includes algorithms that compute individual reviewer’s review accuracy, which is in turn used to support the various drawbacks of reciprocal peer reviews (e.g., variation in motivation or ability of reviewers). Finally, this paper describes an empirical evaluation showing that the SWoRD approach is effective in improving writing quality in content classes.  相似文献   
9.
县级城镇CATV系统工程总体技术方案   总被引:1,自引:1,他引:0  
改造CATV网络系统必须有一个规范的设计方案,对网改设计方案进行探讨,提出网络设计的依据和原则、规划思路和技术方案以及安全性能要求,使网络改造后能有效地开展多功能服务。  相似文献   
10.
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