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   22683篇
  免费   561篇
管理学   3108篇
民族学   99篇
人才学   2篇
人口学   2154篇
丛书文集   133篇
教育普及   3篇
理论方法论   2059篇
现状及发展   1篇
综合类   461篇
社会学   11037篇
统计学   4187篇
  2023年   131篇
  2021年   120篇
  2020年   341篇
  2019年   423篇
  2018年   479篇
  2017年   693篇
  2016年   539篇
  2015年   392篇
  2014年   464篇
  2013年   3807篇
  2012年   721篇
  2011年   614篇
  2010年   450篇
  2009年   460篇
  2008年   515篇
  2007年   530篇
  2006年   447篇
  2005年   585篇
  2004年   517篇
  2003年   450篇
  2002年   495篇
  2001年   560篇
  2000年   553篇
  1999年   546篇
  1998年   369篇
  1997年   352篇
  1996年   356篇
  1995年   336篇
  1994年   321篇
  1993年   315篇
  1992年   384篇
  1991年   357篇
  1990年   345篇
  1989年   376篇
  1988年   331篇
  1987年   305篇
  1986年   309篇
  1985年   327篇
  1984年   342篇
  1983年   335篇
  1982年   270篇
  1981年   232篇
  1980年   226篇
  1979年   286篇
  1978年   217篇
  1977年   196篇
  1976年   180篇
  1975年   173篇
  1974年   167篇
  1973年   156篇
排序方式: 共有10000条查询结果,搜索用时 927 毫秒
191.
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   
192.
193.
Although empathy has been found to distinguish effective counsellors from less effective counsellors, human services professionals who continually experience negative emotional reactions to the feelings that clients express in counselling may be at risk of developing burnout. This study examined the hypothesis that emotional empathy rather than cognitive empathy is associated with burnout. The sample of human services professionals consisted of 71 Salvation Army Officers. Multiple regression was used to investigate whether the dimensions of empathy could predict three aspects of burnout: personal accomplishment, emotional exhaustion and depersonalization. The first regression analysis indicated that personal distress and empathic concern were significant predictor of personal accomplishment. The second analysis indicated that personal distress was a significant predictor of emotional exhaustion. The third indicated that empathic concern was a significant predictor of depersonalization. Although these results support the hypothesis, personal distress was negatively associated with personal accomplishment, whereas empathic concern was positively associated with personal accomplishment. The small size of the sample may have influenced the reliability of the findings. A multidimensional approach to the role of empathy in counselling may help human services professionals to manage their emotional reactions when they engage in counselling with distressed clients.  相似文献   
194.
195.
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   
196.
Since children, particularly daughters, are among the most important sources of help and support for older Americans, it has been suggested that women's increasing employment will affect filial relations. Empirical evidence on this issue is inconsistent, in part due to the use of nonprobability samples. Few studies have measured effects for men. We attempt to broaden the scope of this question beyond help to the frail elderly by asking whether employment affects filial relations in general. We examine effects of hours employed on telephone contact, visiting, feelings of closeness, filial attitudes, and assistance to biological parents, for an area probability sample of men and women over 40. There are no effects of employment for men or women on contact, closeness, or assistance. For the vast majority of this population sample, contact and assistance involve few hours per week, and thus do not seem to conflict with employment.  相似文献   
197.
198.
199.
200.
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