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   23736篇
  免费   2224篇
  国内免费   1916篇
电工技术   1529篇
技术理论   13篇
综合类   3410篇
化学工业   445篇
金属工艺   403篇
机械仪表   899篇
建筑科学   3971篇
矿业工程   392篇
能源动力   216篇
轻工业   357篇
水利工程   469篇
石油天然气   296篇
武器工业   90篇
无线电   4128篇
一般工业技术   1593篇
冶金工业   980篇
原子能技术   42篇
自动化技术   8643篇
  2024年   85篇
  2023年   281篇
  2022年   514篇
  2021年   603篇
  2020年   778篇
  2019年   527篇
  2018年   590篇
  2017年   632篇
  2016年   683篇
  2015年   834篇
  2014年   1749篇
  2013年   1706篇
  2012年   1868篇
  2011年   1976篇
  2010年   1575篇
  2009年   1680篇
  2008年   1758篇
  2007年   1902篇
  2006年   1664篇
  2005年   1457篇
  2004年   1196篇
  2003年   939篇
  2002年   704篇
  2001年   525篇
  2000年   441篇
  1999年   282篇
  1998年   182篇
  1997年   142篇
  1996年   113篇
  1995年   86篇
  1994年   74篇
  1993年   42篇
  1992年   25篇
  1991年   19篇
  1990年   28篇
  1989年   20篇
  1988年   19篇
  1987年   8篇
  1986年   9篇
  1985年   12篇
  1984年   11篇
  1983年   9篇
  1982年   15篇
  1981年   12篇
  1980年   7篇
  1965年   8篇
  1958年   7篇
  1957年   13篇
  1956年   7篇
  1954年   9篇
排序方式: 共有10000条查询结果,搜索用时 140 毫秒
41.
根据GPRS业务及业务发展情况,对GPRS业务模型进行深入研究,并对GPRS无线网络进行了更深入的探讨。  相似文献   
42.
What do health care practitioners need to know about providing adequate care for depressed minority women? This article examined the prevalence of depressive symptoms and clinical depression in ethnic minorities, the extent to which current health service utilization is congruent with needs, and the effectiveness of treatments provided to ethnic minorities in the primary care setting. The impact of ethnic minority women's sociocultural context on symptom expression and help-seeking behavior is also discussed. Finally, the clinical implications for accurate assessment and treatment of ethnic minority women by both medical and mental health practitioners working in the primary care sector are addressed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
43.
作为公民共同行为有机组成部分的公益诉讼的本质决定了律师参与公益诉讼是尽公民之本分,而作为具有为公众服务精神的律师政治家这一律师职业理想的要求,又决定了律师参与公益诉讼是律师职业特有品格的体现,是律师和律师职业真正获得尊重的基础。结合公益诉讼的现实,从立法上肯定律师参与公益诉讼的主体地位,既可保证律师实现社会正义这一价值追求,又可保证实现公益诉讼的理想效果。  相似文献   
44.
Comments on an article by Bushman and Anderson (see record 2001-17729-001). We are concerned that Bushman and Anderson's article on media violence contains data that are incorrect or irreproducible. This is a serious issue; the article has already been referenced by numerous other formal papers according to a Google scholarly article search as well as in a statement to the U.S. Senate, in legal proceedings, and in California State law (Assembly Bill 1179 in 2005). (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
45.
Objective: To evaluate the effects of disability type, job complexity, and public contact on hiring decisions. Design and Participants: An Americans With Disabilities Act (ADA; 1990) fact sheet and matched resumes with vocational and medical histories including chronic mental illness, developmental disability, closed head injury, and back injury were provided to 295 undergraduate business-related majors, who rated the applicants' suitability for 2 job positions and work shifts. Results: Findings indicated disparities in ratings of employability as a function of disability type. Paired comparisons yielded complementary findings, with effects of disability type and Disability Type × Job Complexity, but no effects of public contact. Conclusions: Stereotyping and discrimination in employment decisions apparently persist, more than 10 years after the ADA. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
46.
The authors proposed and tested a model describing the relationship between customer service providers' perceptions and attitudes toward their service-related duties and their customers' perceptions of satisfaction with their service experiences. Results indicated that the perception of having standards for service delivery in an organization is strongly related to line-level employees' perceptions of support from coworkers and supervisors. Perceived support from coworker, was significantly related to service providers' customer orientation, whereas perceived support from supervisors showed a weaker relationship to a customer orientation. Ultimately, service providers' customer orientation was strongly related to customers' satisfaction with service. Finally, a set of post hoc analyses indicated that coworker and supervisory support explained a greater proportion of incremental variance in the model than did perceived organizational support alone. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
47.
Boundary objects are a critical, but understudied, theoretical construct in CSCW. Through a field study of aircraft technical support, we examined the role of boundary objects in the practical achievement of safety by service engineers. Their resolution of repair requests was preserved in the organization’s memory via three compound boundary objects. These crystallizations did not manifest a static interpretation, but instead were continually reinterpreted in light of meta-negotiations. This suggests design implications for organizational memory systems which can more fluidly represent the meta-negotiations surrounding boundary objects.  相似文献   
48.
企业办社会虽与市场经济的客观要求相悖,但石油企业大量办社会的事实仍揭示了所具备的理性面。认为国家作为不受所有者监督的代理者对石油企业的要求,石油企业的行业特性以及在传统体制下长期运作所成的定热是石油企业办社会的主要原因。  相似文献   
49.
ATM技术能否在数据通信网中广泛采用取决于其是否能高效地支持现有业务,其中主要为非连接业务。本文介绍了几种基于ATM 的非连接业务支持方式和协议体系结构,对其进行了评述并对IP分组到ATM信元的封装效率进行了分析。  相似文献   
50.
掉话率是无线通信网络中最重要的关键性能指标(KPI)之一,本文分析了中国移动在讨论网络性能评估方法时提出的3个不同的掉话率计算公式,通过建立一个单小区的模型,使用一些合理的假设和分析,从理论上确定了一个最为准确的计算公式.  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