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   8268篇
  免费   658篇
  国内免费   1篇
管理学   1345篇
民族学   54篇
人口学   612篇
丛书文集   21篇
理论方法论   1081篇
综合类   93篇
社会学   4131篇
统计学   1590篇
  2023年   54篇
  2022年   46篇
  2021年   129篇
  2020年   306篇
  2019年   464篇
  2018年   419篇
  2017年   537篇
  2016年   494篇
  2015年   414篇
  2014年   437篇
  2013年   1388篇
  2012年   522篇
  2011年   366篇
  2010年   309篇
  2009年   245篇
  2008年   308篇
  2007年   233篇
  2006年   225篇
  2005年   185篇
  2004年   168篇
  2003年   141篇
  2002年   128篇
  2001年   145篇
  2000年   121篇
  1999年   66篇
  1998年   46篇
  1997年   57篇
  1996年   47篇
  1995年   42篇
  1994年   57篇
  1993年   50篇
  1992年   58篇
  1991年   59篇
  1990年   43篇
  1989年   49篇
  1988年   58篇
  1987年   26篇
  1986年   32篇
  1985年   42篇
  1984年   32篇
  1983年   40篇
  1982年   27篇
  1981年   23篇
  1980年   23篇
  1979年   25篇
  1978年   42篇
  1977年   22篇
  1976年   27篇
  1975年   26篇
  1974年   17篇
排序方式: 共有8927条查询结果,搜索用时 0 毫秒
51.
"Complete decennial censuses are needed for small areas and other domains. Sample surveys yield diverse and timely data. Censuses can also be combined with samples, and sometimes with data from registers, for diverse estimates that are detailed over both space and time, and hence are timely for small domains. Methods of 'postcensal estimates' for small domains are described. We note uses of censuses for improving samples and of samples for improving censuses, and propose a method for cumulating data from 'rolling' (or rotating) periodic (weekly, monthly or quarterly) samples specifically designed to cover the population in detail over designed spans (annual and quinquennial)."  相似文献   
52.
53.
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   
    54.
    The author reviews migration data sources and government collection agencies in the Philippines. He finds that "despite the importance of international migration for national policy, efforts to correct the serious data limitations in the area of migration statistics have been limited and uncoordinated. In fact, most estimates of emigration levels from the Philippines still rely heavily on the data gathered by receiving countries."  相似文献   
    55.
    56.
    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   
    57.
    This paper examines the mediating mechanism of the relationship between institutional voids (IVs) and inter‐firm cooperation and the moderating role of economic adversity in the context of small and medium‐sized enterprises (SMEs) based in emerging markets. The hypotheses are tested using time‐lagged survey data from 214 SMEs in Ghana. The findings provide support for the hypotheses by showing that: (1) IVs positively influence the use of government research and development (R&D) support; (2) the use of government R&D support mediates the relationship between IVs and inter‐firm cooperation; and (3) economic adversity positively moderates the relationship between IVs and the use of government R&D support. The findings contribute to understanding the role of IVs in inter‐firm cooperation. The wider implications for theory and practice are examined.  相似文献   
    58.
    Balancing act     
      相似文献   
    59.
    This study examines the impact of race and ethnic group on the integration of immigrants into the labor force in Canada. A distinction is made between migrants who are free to change jobs at will and those bound by legal and other constraints from so doing. The examples of agricultural and domestic workers are chosen to illustrate how the different types of migrants are incorporated into the country's production relations. (SUMMARY IN FRE AND SPA)  相似文献   
    60.
    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   
    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