全文获取类型
收费全文 | 91599篇 |
免费 | 1999篇 |
国内免费 | 3篇 |
专业分类
管理学 | 12476篇 |
民族学 | 546篇 |
人才学 | 26篇 |
人口学 | 6924篇 |
丛书文集 | 525篇 |
理论方法论 | 9607篇 |
综合类 | 2109篇 |
社会学 | 42370篇 |
统计学 | 19018篇 |
出版年
2023年 | 518篇 |
2021年 | 576篇 |
2020年 | 1528篇 |
2019年 | 2235篇 |
2018年 | 2093篇 |
2017年 | 3168篇 |
2016年 | 2430篇 |
2015年 | 2089篇 |
2014年 | 2667篇 |
2013年 | 19024篇 |
2012年 | 2395篇 |
2011年 | 2159篇 |
2010年 | 1983篇 |
2009年 | 2220篇 |
2008年 | 2070篇 |
2007年 | 1862篇 |
2006年 | 2092篇 |
2005年 | 2280篇 |
2004年 | 2165篇 |
2003年 | 1930篇 |
2002年 | 2026篇 |
2001年 | 1998篇 |
2000年 | 1782篇 |
1999年 | 1675篇 |
1998年 | 1518篇 |
1997年 | 1364篇 |
1996年 | 1322篇 |
1995年 | 1337篇 |
1994年 | 1292篇 |
1993年 | 1282篇 |
1992年 | 1261篇 |
1991年 | 1193篇 |
1990年 | 1173篇 |
1989年 | 1005篇 |
1988年 | 1113篇 |
1987年 | 994篇 |
1986年 | 885篇 |
1985年 | 1075篇 |
1984年 | 1117篇 |
1983年 | 1002篇 |
1982年 | 928篇 |
1981年 | 853篇 |
1980年 | 812篇 |
1979年 | 868篇 |
1978年 | 770篇 |
1977年 | 692篇 |
1976年 | 656篇 |
1975年 | 623篇 |
1974年 | 522篇 |
1973年 | 436篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
321.
While shows like The X-Files and 24 have merged conspiracy theories with popular science (fictions), some video games have been pushing the narrative even further. Electronic Art's Majestic game was released in July 2001 and quickly generated media buzz with its unusual multi-modal gameplay. Mixing phone calls, faxes, instant messaging, real and "fake' websites, and email, the game provides a fascinating case of an attempt at new directions for gaming communities. Through story, mode of playing, and use of technology, Majestic highlights the uncertain status of knowledge, community and self in a digital age; at the same time, it allows examination of alternative ways of understanding games' role and purpose in the larger culture. Drawing on intricate storylines involving government conspiracies, techno-bio warfare, murder and global terror, players were asked to solve mysteries in the hopes of preventing a devastating future of domination. Because the game drew in both actual and Majestic-owned/-designed websites, it constantly pushed those playing the game right to borders where simulation collides with " factuality'. Given the wide variety of "legitimate' conspiracy theory, alien encounters and alternative science web pages, users often could not distinguish when they were leaving the game's pages and venturing into " real' World Wide Web sites. Its further use of AOL's instant messenger system, in which gamers spoke not only to bots but to other players, pushed users to evaluate constantly both the status of those they were talking to and the information being provided. Additionally, the game required players to occupy unfamiliar subject positions, ones where agency was attenuated, and which subsequently generated a multi-layered sense of unease among players. This mix of authentic and staged information in conjunction with technologically mediated roles highlights what are often seen as phenomenon endemic to the Internet itself; that is, the destabilization of categories of knowing, relating, and being. 相似文献
322.
This article aims to bring gender into an even tighter transnational migration focus by broadening and deepening our original framework of “gendered geographies of power,” linking it more directly to existing and emerging scholarship. We examine and highlight previously neglected areas such as the role of the state and the social imaginary in gendering transnational processes and experiences. We identify topics that remain under‐appreciated, under‐researched, and/or under‐theorized. Finally, we initiate a discussion of how a gendered analysis of transnational migration can help bridge this particular research to other gendered transnational processes under study that do not privilege migration. 相似文献
323.
D. R. Cox Man Yu Wong 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2004,66(2):395-400
Summary. Given a large number of test statistics, a small proportion of which represent departures from the relevant null hypothesis, a simple rule is given for choosing those statistics that are indicative of departure. It is based on fitting by moments a mixture model to the set of test statistics and then deriving an estimated likelihood ratio. Simulation suggests that the procedure has good properties when the departure from an overall null hypothesis is not too small. 相似文献
324.
Testing symmetry under a skew Laplace model 总被引:3,自引:0,他引:3
Tomasz J. Kozubowski Anna K. Panorska 《Journal of statistical planning and inference》2004,120(1-2):41-63
We develop tests of hypothesis about symmetry based on samples from possibly asymmetric Laplace distributions and present exact and limiting distribution of the test statistics. We postulate that the test statistic derived under the Laplace model is a rational choice as a measure of skewness and can be used in testing symmetry for other, quite general classes of skew distributions. Our results are applied to foreign exchange rates for 15 currencies. 相似文献
325.
魏晋南北朝是中国古代动乱最多、人民生活最悲惨的时代。战争、动乱使汉王朝“独尊儒术”的旧思想体制大崩溃 ,导致魏晋南北朝时期的古代中国思想最解放、最自由。美学思想和精神的自由 ,酿就了艺术创造精神的勃发 ,因而新的艺术形式、艺术规律应运而生并相互融会贯通。此时的盆景艺术正是在绘画、园林、盆栽、赏石等艺术形式的影响下孕育了自己最初的表现形式和美学规律 ,因此可以说该时期是盆景发展史上的一个重要阶段 相似文献
326.
Using 1994 National Long Term Care Survey data, we estimated logistic regressions of formal and informal home health care use and hours. Home health care use and intensity were differentially impacted by chronic conditions, are higher for Medicaid enrollees and rural or small town residents, but lower for HMO enrollees. Decreases in the probability of home health care use increased informal instrumental activities of daily living (IADL) support four hours and decreased informal activities of daily living (ADL) support eight hours weekly. IADL caregiving substituted for formal care, but ADL caregiving declined with reductions in formal care. Public policy reducing formal home health care access may reduce informal ADL caregiving and increase informal IADL caregiving, producing net declines in support. 相似文献
327.
328.
山西省农村人力资源开发现状及对策 总被引:1,自引:0,他引:1
农村人力资源开发是在对全体农村人口进行认真分析的基础上 ,确立以农村为主的不同农村人口类群中的质量差别 ,同时利用培训和教育等多种渠道 ,有效地进行人力资源资本投资 ,努力提高农村人口素质 ,以实际行动落实科教兴农的战略构想。本文从农村人力资源的规模及构成 ,文化素质及构成以及农村人口的从业类别三个方面对我省农村人力资源开发现状进行剖析 ;在认清现状的基础上 ,分别从投资规模 ,农村教育体制 ,组织领导 ,制度建设 ,思想观念等五个方面深入分析了造成目前现状的根源 ,并结合我省实际提出相应的对策建议 ,并创新了一套具有操作性的运作模式。 相似文献
329.
W. Andrew Collins 《Journal of research on adolescence》2003,13(1):1-24
Adolescents' romantic relationships have attracted popular interest, but, until recently, little scientific curiosity. Research has been impeded by erroneous assumptions that adolescent relationships are trivial and transitory, that they provide little information beyond measures of the influence of parent‐child and peer relationships, and that their impact is primarily associated with problems of behavior and adjustment. This article proposes that distinguishing five features of romantic relationships (involvement, partner selection, relationship content, quality, and cognitive and emotional processes) is essential to describing adolescents' relationships and their developmental significance. These distinctions also help to clarify the role of context, age‐related variations, and individual differences in the impact of romantic experiences. Research is needed to illuminate questions of how and under what conditions romantic relationships affect individual development and how romantic and other close relationships jointly influence developmental trajectories during adolescence. 相似文献
330.
Jan C. H. van Eijkeren 《Risk analysis》2002,22(1):159-173
A mechanistic model is presented describing the clearance of a compound in a precision-cut liver slice that is incubated in a culture medium. The problem of estimating metabolic rate constants in PBPK models from liver slice experiments is discussed using identifiability analysis. From the identifiability problem analysis, it appears that in addition to the clearance, the compound's free fraction in the slice and the diffusion rate of the exchange of the compound between culture medium and liver slice should be identified. In addition, knowledge of the culture medium volume, the slice volume, the compound's free fraction, and octanol-water-based partition between medium and slice is presupposed. The formal solution for identification is discussed from the perspective of experimental practice. A formally necessary condition for identification is the sampling of parent compound in liver slice or culture medium. However, due to experimental limitations and errors, sampling the parent compound in the slice together with additional sampling of metabolite pooled from the medium and the slice is required for identification in practice. Moreover, it appears that identification results are unreliable when the value of the intrinsic clearance exceeds the value of the diffusion coefficient, a condition to be verified a posteriori. 相似文献