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   18537篇
  免费   354篇
管理学   2209篇
民族学   103篇
人才学   6篇
人口学   1731篇
丛书文集   106篇
教育普及   2篇
理论方法论   1683篇
现状及发展   1篇
综合类   235篇
社会学   9200篇
统计学   3615篇
  2023年   111篇
  2022年   80篇
  2021年   104篇
  2020年   302篇
  2019年   456篇
  2018年   459篇
  2017年   639篇
  2016年   452篇
  2015年   354篇
  2014年   430篇
  2013年   3117篇
  2012年   655篇
  2011年   570篇
  2010年   458篇
  2009年   430篇
  2008年   491篇
  2007年   494篇
  2006年   454篇
  2005年   415篇
  2004年   412篇
  2003年   386篇
  2002年   384篇
  2001年   464篇
  2000年   383篇
  1999年   376篇
  1998年   307篇
  1997年   278篇
  1996年   286篇
  1995年   272篇
  1994年   257篇
  1993年   249篇
  1992年   290篇
  1991年   287篇
  1990年   259篇
  1989年   257篇
  1988年   243篇
  1987年   226篇
  1986年   218篇
  1985年   246篇
  1984年   234篇
  1983年   233篇
  1982年   177篇
  1981年   155篇
  1980年   170篇
  1979年   169篇
  1978年   141篇
  1977年   140篇
  1976年   122篇
  1975年   115篇
  1974年   96篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
971.
Utilizing a cluster sampling design to maximize representativeness, we look at the health effects of acculturation and acculturation stressors among 1,001 adult migrant farmworkers in Fresno, California. Using self‐ratings of mental and physical health as well as the CES‐D depression scale, we find that the amount of time one spends in the United States, the level of English‐language usage, as well as the intensity of acculturation stresses that one reports, are all related to declines in health. In addition, acculturation stress has more deleterious effects on self‐rated health (both physical and mental) among the more highly acculturated.  相似文献   
972.
973.
974.
L.A  华达尔  陈泉 《中国藏学》2004,(2):22-29
编者按:英国发动第二次侵藏战争期间,华达尔从我国西藏地区掠走大量藏文珍贵书籍和手抄本,数量之大,令人震惊.本文是这一事件的自供状,也是近代帝国主义列强对中国进行文化掠夺的最好诠释.需要说明的是,此译文原附有一份被华达尔掠去的藏文文献清单,共计464号.因数量较大,加之专有名词较多,需进一步校订,故未能同时刊登,请读者见谅.本刊将尽快予以刊发.至于作者在表述西藏与中国关系时使用的分裂主义语言,相信读者是会不言自明的.  相似文献   
975.
In recent years, there has been a renewed interest in the criminal victimization of elderly persons. Given that homicides of the elderly are thought to occur primarily in the context of robbery/burglary situations, this study seeks to identify situational as well as structural and cultural factors that influence the murder of older persons. In particular, it has been noted that Southern culture promotes a notion that one should 'respect their elders.' Using conservative Protestant affiliation as a proxy for Southern culture, this study also examines the relationship between Southern culture and homicide of the elderly. Findings show that Southern culture as reflected in conservative Protestant affiliation does not insulate the elderly from victimization.  相似文献   
976.
Decisions about management of invasive species are difficult for all the reasons typically addressed by multiattribute decision analysis: uncertain outcomes, multiple and conflicting objectives, and many interested parties with differing views on both facts and values. This article illustrates how the tools of multiattribute analysis can improve management of invasive species, with an emphasis on making explicit the social values and preferences that must inform invasive species management. Risk assessment protocols developed previously for invasive species management typically suffer from two interacting flaws: (1) separating risk assessment from risk management, thus disrupting essential connections between the social values at stake in invasive species decisions and the scientific knowledge necessary to predict the likely impacts of management actions, and (2) relying on expert judgment about risk framed in qualitative and value-laden terms, inadvertently mixing the expert's judgment about what is likely to happen with personal preferences. Using the values structuring and probability-modeling elements of formal decision analysis can remedy these difficulties and make invasive species management responsive to both good science and public values. The management of feral pigs in Hawaiian ecosystems illustrates the need for such an integrated approach.  相似文献   
977.
Assessments of aggregate exposure to pesticides and other surface contamination in residential environments are often driven by assumptions about dermal contacts. Accurately predicting cumulative doses from realistic skin contact scenarios requires characterization of exposure scenarios, skin surface loading and unloading rates, and contaminant movement through the epidermis. In this article we (1) develop and test a finite-difference model of contaminant transport through the epidermis; (2) develop archetypal exposure scenarios based on behavioral data to estimate characteristic loading and unloading rates; and (3) quantify 24-hour accumulation below the epidermis by applying a Monte Carlo simulation of these archetypal exposure scenarios. The numerical model, called Transient Transport through the epiDERMis (TTDERM), allows us to account for variable exposure times and time between exposures, temporal and spatial variations in skin and compound properties, and uncertainty in model parameters. Using TTDERM we investigate the use of a macro-activity parameter (cumulative contact time) for predicting daily (24-hour) integrated uptake of pesticides during complex exposure scenarios. For characteristic child behaviors and hand loading and unloading rates, we find that a power law represents the relationship between cumulative contact time and cumulative mass transport through the skin. With almost no loss of reliability, this simple relationship can be used in place of the more complex micro-activity simulations that require activity data on one- to five-minute intervals. The methods developed in this study can be used to guide dermal exposure model refinements and exposure measurement study design.  相似文献   
978.
Policy makers, parents, and the public are concerned with perceived declines in parents’ time with children. Data from two national surveys (N = 1,159 and N = 821) used in this study show that nearly half of parents report feeling too little time with children. Work hours are strongly related to these feelings, even controlling for time spent with children, and explain why fathers more than mothers feel time strain. For fathers, those whose youngest child is an adolescent feel more strain than similarly situated mothers. Controlling for work hours, single parents are not more likely than married parents to feel that they spend insufficient time with children.  相似文献   
979.
980.
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