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   3087篇
  免费   85篇
管理学   485篇
民族学   24篇
人才学   1篇
人口学   273篇
丛书文集   27篇
理论方法论   311篇
综合类   34篇
社会学   1602篇
统计学   415篇
  2023年   25篇
  2022年   18篇
  2021年   30篇
  2020年   72篇
  2019年   77篇
  2018年   92篇
  2017年   129篇
  2016年   117篇
  2015年   85篇
  2014年   95篇
  2013年   463篇
  2012年   128篇
  2011年   114篇
  2010年   75篇
  2009年   97篇
  2008年   92篇
  2007年   78篇
  2006年   83篇
  2005年   98篇
  2004年   97篇
  2003年   86篇
  2002年   86篇
  2001年   85篇
  2000年   70篇
  1999年   51篇
  1998年   38篇
  1997年   33篇
  1996年   47篇
  1995年   36篇
  1994年   34篇
  1993年   52篇
  1992年   39篇
  1991年   35篇
  1990年   26篇
  1989年   22篇
  1988年   24篇
  1987年   24篇
  1986年   23篇
  1985年   22篇
  1984年   32篇
  1983年   24篇
  1982年   28篇
  1981年   20篇
  1980年   20篇
  1979年   21篇
  1978年   13篇
  1977年   22篇
  1975年   21篇
  1974年   19篇
  1973年   10篇
排序方式: 共有3172条查询结果,搜索用时 0 毫秒
81.
82.
83.
84.
Western European and Native American approaches to spirituality, nature, and science have implications for policy decisions now and into the Twenty First century. This essay explicates traditional American Indian and Western European philosophic and spiritual views of nature in order to promote dialogue and inform choices that are crucial regarding the future of the biosphere. A concept of nature, then, is more than just an explanation of how living things interact with one another. It also serves as a reference point for deciphering the meaning of existence itself. Jeremy Rifkin  相似文献   
85.
This paper extends the micro-level empirical literature on migration decision making by investigating the manner in which husbands' and wives' subjective place utility expectations jointly feed into migration decisions in a low-income country. The authors use expectational data relating to four place utility dimensions and stated migration intentions of 376 village-resident Egyptian couples to test alternative decision models. An ordinal probit estimation technique is employed. The results of the analyses support the hypothesis of husband dominance in migration decisions in this context. The authors conclude with a discussion of the implications of the paper for further theoretical refinement and for migration survey design in this and other developing countries.Dr. McDevitt is a Research Associate of the Carolina Population Center, The University of North Carolina at Chapel Hill. Dr. Gadalla, former Director of The Social Research Center of The American University in Cairo, is currently Visiting Distinguished Professor of Sociology-Demography, San Diego State University, San Diego.This is a revised version of a paper presented at the 1984 annual meetings of the Population Association of America and cited throughout as McDevitt and Gadalla (1984). The authors wish to acknowledge helpful discussions with Amos Hawley in the early stages of the development of the paper and the guidance of David Guilkey and Larry Taylor with the statistical techniques employed in the work reported in the paper. The research was supported in part by grants 1-R01-HD14943 and 1-T32-HD07168 from the National Institutes of Health.  相似文献   
86.
CONCEPTUALIZING CONTEMPORARY HEALTH LIFESTYLES:   总被引:3,自引:0,他引:3  
The intent of this article is to move beyond the work of Weber and construct a concept of health lifestyles applicable to the current phase of modernity. Beginning with the early twentieth-century work of Simmel and Weber on lifestyles generally, we move to mid-century to examine Bourdieu's perspective and turn to Giddens for an analysis of late century conditions. We find that Weber's insight concerning the dialectical interplay of choice and chance remains the central feature of the lifestyle concept. We also suggest that in rapidly changing late or postmodern situations, lifestyles not only provide self-identity but also promote a sense of stability and belonging for an individual by providing an anchor in a particular social constellation of style and activity. Our discussion leads us to define health lifestyles as collective patterns of health-related behavior based on choices from options available to people according to their life chances. Consistent with Bourdieu's notion of habitus, we assign priority to chance (structure) over choice.  相似文献   
87.
Many organizational change projects fail — despite a well thought out concept, professional project management and a binding implementation timetable. The reason why the expected success doesn’t materialize often lies with the missing maintenance. Once the project is officially completed and the client and project manager withdraw, the manner in which the organization will take up these changes is seldom systematically dealt with. Difficulties often arise when no discrete stabilizing measures are planned. We have derived four central action areas which will be clarified by way of practical examples. It will also be shown what is important to pay attention to in the stabilization phase so that a lasting success of the organizational change project can be ensured.  相似文献   
88.
89.
This study surveyed 975 undergraduates attending a large East Coast university during the spring semester of the 1987/88 academic year. A convenience sample of predominantly black students (94%) participated. Overall, knowledge of basic AIDS-related facts was satisfactory. Raw scores on the 25-item knowledge scale ranged from 7 to 25, with a mean of 20.5 (82%) and a mode of 22 (88%). Selected questions on how HIV is not transmitted, however, posed some problems for respondents. Less than 30% of respondents knew that the AIDs virus was not transmitted by insects; less than 80% knew that AIDS was not transmitted on toilet seats, through blood donations, kissing, and coughing. The survey also asked students whether they had ever engaged in certain behaviors that put them at risk of HIV infection. Approximately 17% of respondents had experienced anal intercourse, 6.5% reported use of heroin, 32.6% reported having had multiple sex partners, and 16% had been treated for a sexually transmitted disease. Students who reported engaging in high-risk behaviors had statistically significant lower mean knowledge scores than those who reported not engaging in those same high-risk behaviors. Results of the study support the need to increase efforts to deliver AIDS information specifically targeted to individuals who may be engaged in high-risk behaviors. Special health education programs must be designed to focus attention on risk behaviors (ie, unprotected anal intercourse) instead of risk groups (ie, homosexual and bisexual males).  相似文献   
90.

In this paper, an extension of the minimum cost flow problem is considered in which multiple incommensurate weights are associated with each arc. In the minimum cost flow problem, flow is sent over the arcs of a graph from source nodes to sink nodes. The goal is to select a subgraph with minimum associated costs for routing the flow. The problem is tractable when a single weight is given on each arc. However, in many real-world applications, several weights are needed to describe the features of arcs, including transit cost, arrival time, delay, profit, security, reliability, deterioration, and safety. In this case, finding an optimal solution becomes difficult. We propose a heuristic algorithm for this purpose. First, we compute the relative efficiency of the arcs by using data envelopment analysis techniques. We then determine a subgraph with efficient arcs using a linear programming model, where the objective function is based on the relative efficiency of the arcs. The flow obtained satisfies the arc capacity constraints and the integrality property. Our proposed algorithm has polynomial runtime and is evaluated in rigorous experiments.

  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