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   15559篇
  免费   547篇
  国内免费   15篇
管理学   1878篇
民族学   114篇
人才学   1篇
人口学   1418篇
丛书文集   145篇
理论方法论   1428篇
综合类   747篇
社会学   8210篇
统计学   2180篇
  2023年   108篇
  2022年   84篇
  2021年   144篇
  2020年   316篇
  2019年   359篇
  2018年   516篇
  2017年   694篇
  2016年   500篇
  2015年   371篇
  2014年   436篇
  2013年   2501篇
  2012年   696篇
  2011年   573篇
  2010年   477篇
  2009年   403篇
  2008年   481篇
  2007年   474篇
  2006年   471篇
  2005年   402篇
  2004年   324篇
  2003年   299篇
  2002年   301篇
  2001年   361篇
  2000年   297篇
  1999年   284篇
  1998年   210篇
  1997年   178篇
  1996年   169篇
  1995年   179篇
  1994年   168篇
  1993年   170篇
  1992年   197篇
  1991年   197篇
  1990年   189篇
  1989年   169篇
  1988年   176篇
  1987年   193篇
  1986年   152篇
  1985年   163篇
  1984年   177篇
  1983年   151篇
  1982年   155篇
  1981年   123篇
  1980年   112篇
  1979年   125篇
  1978年   99篇
  1977年   81篇
  1976年   93篇
  1975年   111篇
  1974年   86篇
排序方式: 共有10000条查询结果,搜索用时 625 毫秒
21.
Fire hazard is a mounting concern in tropical rainforests of the Brazilian Amazon and has raised awareness within the science community of the links between agricultural fire use, drought and accidental fire. As a result, fire is being addressed as a crisis event with mitigation focused on those who light fires, particularly smallholder agriculturalists. Little attention is paid to the historical and ongoing ways in which Amazon landscapes and peoples have been made more susceptible to fire. Frontier regions of the Brazilian Amazon serve a variety of functions within the larger Brazilian society, including as extractive reserves for economic development, as social safety valves to reduce population pressures, and as areas to support urban regional integration. Each of these functions has impacted frontier environments in ways that create more flammable landscapes and/or shape the vulnerability of people to fire hazard. This paper uses a case study inthe Brazilian Lower Amazon to understand how vulnerability to fire hazard develops. It argues that if fire mitigation remains centered on fire as a crisis event, an understanding of what constitutes frontier spaces of vulnerability, both in landscape and in populations, will be limited.  相似文献   
22.
A study sample of 162 six‐month‐old children was selected from a larger sample of 346 infants on the basis of parents' report of their infants' temperament and a laboratory assessment of temperament. Infants were classified as easily frustrated and less easily frustrated and compared on a number of emotion regulation, physiology, and temperament measures. Results indicated that male and female infants were equally likely to be classified as frustrated and less easily frustrated; however, male infants were less able to regulate physiologically. Easily frustrated infants used different emotion regulation strategies and were observed to be less attentive and more active than less easily frustrated infants when observed in the laboratory. These infants were also characterized by their parents as more active, less attentive, and more distressed to novelty. Infants classified as easily frustrated were more reactive physiologically and less able to regulate physiological reactivity than their less easily frustrated counterparts. It is hypothesized that this cluster of characteristics may constitute a unique temperamental type that may have implications for other types of behavioral functioning. Limitations of the study are that observations are based on a single brief assessment of the infant, modest effect sizes were found, and the study is cross‐sectional.  相似文献   
23.
24.
Editorial     
Ohne Zusammenfassung
Editorial
  相似文献   
25.
26.
The sociocultural content of foreign language textbooks has become a concern of scholars and practitioners owing to the fact that the traditional emphasis on purely linguistic issues has been expanded to embrace a language in context approach. This paper studies the English‐speaking communities that are described in English language teaching textbooks marketed in Spain. It examines to what extent an international and/or intercultural approach is a constituent element in their design.  相似文献   
27.
28.
29.
A test of congruence among distance matrices is described. It tests the hypothesis that several matrices, containing different types of variables about the same objects, are congruent with one another, so they can be used jointly in statistical analysis. Raw data tables are turned into similarity or distance matrices prior to testing; they can then be compared to data that naturally come in the form of distance matrices. The proposed test can be seen as a generalization of the Mantel test of matrix correspondence to any number of distance matrices. This paper shows that the new test has the correct rate of Type I error and good power. Power increases as the number of objects and the number of congruent data matrices increase; power is higher when the total number of matrices in the study is smaller. To illustrate the method, the proposed test is used to test the hypothesis that matrices representing different types of organoleptic variables (colour, nose, body, palate and finish) in single‐malt Scotch whiskies are congruent.  相似文献   
30.
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