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   11954篇
  免费   308篇
管理学   1670篇
民族学   56篇
人才学   1篇
人口学   1240篇
丛书文集   67篇
教育普及   1篇
理论方法论   1056篇
现状及发展   1篇
综合类   138篇
社会学   5814篇
统计学   2218篇
  2023年   79篇
  2021年   60篇
  2020年   176篇
  2019年   242篇
  2018年   275篇
  2017年   397篇
  2016年   300篇
  2015年   199篇
  2014年   256篇
  2013年   2097篇
  2012年   407篇
  2011年   336篇
  2010年   278篇
  2009年   266篇
  2008年   301篇
  2007年   298篇
  2006年   268篇
  2005年   276篇
  2004年   257篇
  2003年   233篇
  2002年   265篇
  2001年   305篇
  2000年   304篇
  1999年   284篇
  1998年   201篇
  1997年   181篇
  1996年   182篇
  1995年   176篇
  1994年   145篇
  1993年   160篇
  1992年   180篇
  1991年   147篇
  1990年   163篇
  1989年   182篇
  1988年   158篇
  1987年   141篇
  1986年   154篇
  1985年   175篇
  1984年   175篇
  1983年   159篇
  1982年   128篇
  1981年   112篇
  1980年   107篇
  1979年   138篇
  1978年   90篇
  1977年   89篇
  1976年   90篇
  1975年   81篇
  1974年   81篇
  1973年   75篇
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
91.
92.
93.
94.
This study examines the relationships among personal coping resources, social support, external coping resources, job stressors and job strains in a sample of 110 American Telephone and Telegraph employees undergoing a major organizational restructuring. The study expanded on a model suggested by Ashford (1988) by defining another category of coping resources that employees may draw upon to deal with the stressors and strains which occur during major organizational changes. External coping resources were defined as those which provided employees with a sense of 'vicarious control' in stressful situations. Results indicated that personal coping resources, social support and external coping resources had a direct effect upon job stressor and strain levels. No 'buffering' effect of these coplng resources was found. Hierarchical regression analyses indicated that external coping resources added to the prediction of job stressors and strains even when pertonal coping resources and social support were entered first into the prediction questions.  相似文献   
95.
96.
The American diet has changed substantially over the last few decades. These changes provide a test for social theory and have substantial effects on the demand for various food products, thus impacting U.S. agriculture. In this paper a rapidly growing dietary choice—vegetarianism—is explored. Prevalence of various forms of vegetarianism is estimated in a representative sample of a suburban population and factors that influence choice of a vegetarian diet are examined. About 7 percent of the sample report they are vegetarians. The prevalence of vegetarianism is not influenced by age, gender, or education, but individuals holding traditional values are less likely to be vegetarian than others. There also is some evidence mat individuals holding altruistic values are more likely than others to be vegetarians.  相似文献   
97.
The goal of Louisiana's 1990–1991 comparative risk project, also called the Louisiana Environmental Action Plan (LEAP), was to incorporate risk assessment into state environmental planning and policymaking. Scientists, government officials, and citizens were brought together to estimate the relative risk to human health, natural resources, and quality of life posed by 33 selected environmental issues. The issues were then ranked according to their relative estimated risks. It was hoped that this ranking of "comparative risks" would enable state policymakers to target the most important environmental problems and allocate scarce public resources more rationally and efficiently. As a result of the project, the governor issued an Executive Order forming a permanent Public Advisory Committee to continue this type of comparative risk assessment in Louisiana.  相似文献   
98.
99.
The problem of determining the number of multi-type protection devices and their locations on electrical supply tree networks with subtree dependency is investigated. The aim is to reduce the amount of inconvenience caused to customers that are affected by any given fault on the networks. An appropriate implementation of tabu search is proposed. We exploit a variable neighborhood and a soft aspiration level, and we embed a data structure and reduction tests into the search to speed up the process. Computational tests are performed on randomly generated electrical tree networks varying in size and branch complexity with encouraging results.  相似文献   
100.
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