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   2308篇
  免费   109篇
管理学   264篇
民族学   13篇
人口学   207篇
丛书文集   10篇
理论方法论   295篇
综合类   24篇
社会学   1234篇
统计学   370篇
  2023年   16篇
  2022年   15篇
  2021年   20篇
  2020年   75篇
  2019年   108篇
  2018年   101篇
  2017年   110篇
  2016年   84篇
  2015年   64篇
  2014年   91篇
  2013年   451篇
  2012年   88篇
  2011年   84篇
  2010年   81篇
  2009年   51篇
  2008年   59篇
  2007年   71篇
  2006年   67篇
  2005年   61篇
  2004年   53篇
  2003年   42篇
  2002年   51篇
  2001年   55篇
  2000年   39篇
  1999年   50篇
  1998年   34篇
  1997年   42篇
  1996年   32篇
  1995年   27篇
  1994年   31篇
  1993年   27篇
  1992年   24篇
  1991年   25篇
  1990年   12篇
  1989年   21篇
  1988年   10篇
  1987年   14篇
  1986年   11篇
  1985年   15篇
  1984年   15篇
  1983年   8篇
  1982年   5篇
  1981年   11篇
  1980年   12篇
  1979年   7篇
  1978年   9篇
  1977年   7篇
  1976年   6篇
  1975年   5篇
  1973年   4篇
排序方式: 共有2417条查询结果,搜索用时 15 毫秒
151.
Within a growing Knowledge-Management context, it would appear that Management Research calls for researchers to explicitly understand their own values, have increasing capacity for reflexivity and anticipate various ethical dilemmas that emerge from the research endeavour. This paper provides an overview of the philosophy of ethics and focuses on a researcher's ethical reasoning. It provides a framework for understanding causes of ethical dilemmas in the context of management research and provides strategies for a way forward through such dilemmas. The paper, finally, outlines exercises pertinent to research ethics and ‘hands on’ research praxis.  相似文献   
152.
Within a growing Knowledge-Management context, it would appear that Management Research calls for researchers to explicitly understand their own values, have increasing capacity for reflexivity and anticipate various ethical dilemmas that emerge from the research endeavour. This paper provides an overview of the philosophy of ethics and focuses on a researcher's ethical reasoning. It provides a framework for understanding causes of ethical dilemmas in the context of management research and provides strategies for a way forward through such dilemmas. The paper, finally, outlines exercises pertinent to research ethics and ‘hands on’ research praxis. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   
153.
Family communication about adolescent sexual health and behavior promotes adolescent health and family connectedness. However, few studies seek the perspective of adolescents regarding their recommended strategies for family communication. Findings of a survey of female adolescent family planning patients (n = 249) indicated adolescent recommendations for better family communication included treat teen as an equal, 63%; increase parental knowledge about lifestyle and peer pressures, 61%, and improve parental listening skills, 61%. There were no statistically significant differences according to age, pregnancy history, or school enrollment status for suggested strategies for improved communication with parents. Sexually active adolescent daughters expressed interest in maintaining family connectedness and support with increased time for family activities as well as increased quality and quantity of dialogue between the adolescent girl and her parents.  相似文献   
154.
155.
156.
157.
Tidal freshwater marshes have diverse plant communities that vary spatially and temporally due to hydrology, animal activity, and other factors. Development of urban centers along rivers of the U.S. Atlantic coast has reduced the historic extent and quality of these and other coastal wetlands. Because the vegetation of these wetlands is more complex than that of salt and brackish marshes (where restoration of vegetation typical of natural systems has sometimes been successful), restoration of tidal freshwater marsh vegetation is likely to be more difficult, particularly in urban areas. Watershed urbanization alters hydrology, sediment load, propagule availability and composition, nutrient status, and other variables that together create an environment different from that of wetlands in less developed areas, possibly precluding restoration of typical marsh vegetation. Tidal freshwater wetlands were historically extensive along the Anacostia River in Washington, DC, but most of these were lost due to filling, dredging, or hydrologic alteration. Over the last decade, the U.S. Army Corps of Engineers has implemented projects designed to restore tidal freshwater wetlands along the Anacostia, which involved increasing elevation with dredged river sediment and planting native vegetation. To illustrate some of the mechanisms affecting vegetation development in restored tidal freshwater marshes in urban areas, I present a case study on one of these wetlands, Kingman Marsh, that also includes research at another restored wetland and two natural reference sites. Studies by my research groups indicate that the restored wetlands undergo essentially a planting-modified process of primary succession. Low densities of seeds are initially present in the substrate, and prolific seed dispersal into the restored sites results in high initial plant diversity comprised of plantings and ruderal (i.e. weedy) natives and exotics. Seed banks develop rapidly at the restored sites, probably due to colonization and early reproduction by ruderal species. Hydrology and disturbance by non-native animals (including resident Canada goose) are important variables controlling establishment of vegetation in these systems. Recent literature and the case study indicate that the environmental conditions of urban settings impose constraints in restored wetlands that result in plant communities more like those of urban natural wetlands than those of wetlands in less urbanized watersheds. This suggests that rather than design wetland restoration projects with the goal of creating pristine wetland vegetation, restorationists must identify, accept, and if possible capitalize on the ecological constraints of the urban environment in setting achievable and desirable restoration goals.  相似文献   
158.
This article presents the results of an experiment designed to determine the impact of a group discussion about second-hand consequences of alcohol use on college students' intentions to consume alcohol. Participants were students enrolled in two large Community Health courses at a large Midwestern university (n = 184). After randomization of class sections into an intervention or a control group, intervention group students participated in a class discussion on the negative consequences college students experience as a result of other students' drinking behavior, prior to answering survey questions regarding their drinking behavior intent. Compared to controls who completed the questionnaire only, intervention group participants reported intent to limit themselves to fewer drinks per drinking occasion (p = .003) and fewer drinks per week (p = .004). The effects of the brief educational intervention were analyzed using structural equation modeling, to test the feasibility of a hypothesized intervention mechanism.  相似文献   
159.
160.
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