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   3603篇
  免费   141篇
管理学   459篇
民族学   49篇
人口学   373篇
丛书文集   5篇
理论方法论   339篇
综合类   76篇
社会学   1730篇
统计学   713篇
  2024年   5篇
  2023年   54篇
  2022年   40篇
  2021年   60篇
  2020年   150篇
  2019年   143篇
  2018年   250篇
  2017年   310篇
  2016年   235篇
  2015年   127篇
  2014年   164篇
  2013年   632篇
  2012年   271篇
  2011年   137篇
  2010年   119篇
  2009年   106篇
  2008年   108篇
  2007年   98篇
  2006年   86篇
  2005年   76篇
  2004年   71篇
  2003年   62篇
  2002年   47篇
  2001年   46篇
  2000年   31篇
  1999年   22篇
  1998年   22篇
  1997年   19篇
  1996年   23篇
  1995年   18篇
  1994年   17篇
  1993年   11篇
  1992年   15篇
  1991年   18篇
  1990年   12篇
  1989年   15篇
  1988年   10篇
  1987年   11篇
  1986年   10篇
  1985年   11篇
  1984年   6篇
  1983年   5篇
  1982年   7篇
  1980年   8篇
  1979年   7篇
  1978年   10篇
  1977年   8篇
  1975年   7篇
  1973年   6篇
  1971年   4篇
排序方式: 共有3744条查询结果,搜索用时 15 毫秒
11.
12.
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   
13.
14.
Two questions concerning the location of a single facility by a voting process are investigated for transportation networks:
  • - What is the maximum number of customers located on the network preferring some rival point over a voting solution?
  • - How does the average distance of the customers to the facility increase when a voting location instead of a Weber location is chosen for the facility?
  • Complete answers are given for general networks and for certain planar networks, viz., the so-called generalized cacti.  相似文献   
    15.
    16.
    Ecosystems are formed by organisations that jointly create a value proposition that a single firm could not create in isolation. To deliver this value proposition, the partners need a focal firm, the orchestrator, to be align them towards the joint value proposition. Thus, how orchestrators design the alignment structure of an ecosystem is at the very heart of the ecosystem concept – yet it has not been sufficiently addressed by extant research. This is all the more true for the question of how the design of an ecosystem is shaped depending on surrounding conditions. This paper applies a qualitative study with ten cases and, based on the attention-based view of the firm, contributes to research on ecosystems in several ways. First, it explains which ecosystem designs are beneficial under which conditions. Second, it elucidates the structure and activities within ecosystems and shows that start-ups can be just as good ecosystem orchestrators as incumbents. Third, it explains the circumstances under which single vs. multi orchestrator ecosystems occur. Fourth, it presents the conditions when incumbents or start-ups make better orchestrators. Finally, it is among the first studies to apply the attention-based view to business ecosystems, and shows that doing so yields intriguing insights into this emerging field of research.  相似文献   
    17.
    To change from punitive and legalistic QA to positive and productive CQI, both attitudes and methods must change. This is a difficult challenge, but potential rewards for both the organization and its individual members suggest that the effort is worthwhile and deserves high priority. Members of the executive/management team will likely turn to physician executives for guidance on how to proceed.  相似文献   
    18.
    Contemporary immigration to the United States and the formation of new ethnic groups are the complex and unintended social consequences of the expansion of the nation to its post-World War II position of global hegemony. Immigrant communities in the United States today are related to a history of American military, political, economic, and cultural involvement and intervention in the sending countries, especially in Asia and the Caribbean Basin, and to the linkages that are formed in the process that open a variety of legal and illegal migration pathways. The 19.8 million foreign-born persons counted in the 1990 U.S. census formed the largest immigrant population in the world, though in relative terms, only 7.9% of the U.S. population was foreign-born, a lower proportion than earlier in this century. Today's immigrants are extraordinarily diverse, a reflection of polar-opposite types of migrations embedded in very different historical and structural contexts. Also, unlike the expanding economy that absorbed earlier flows from Europe, since the 1970s new immigrants have entered an hourglass economy with reduced opportunities for social mobility, particularly among the less educated, and new waves of refugees have entered a welfare state with expanded opportunities for public assistance. This paper seeks to make sense of the new diversity. A typology of contemporary immigrants is presented, and their patterns of settlement, their distinctive social and economic characteristics compared to major native-born racial-ethnic groups, and their different modes of incorporation in—and consequences for—American society are considered.  相似文献   
    19.
    20.
    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