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   12725篇
  免费   213篇
管理学   1644篇
民族学   51篇
人才学   1篇
人口学   1096篇
丛书文集   78篇
教育普及   2篇
理论方法论   1170篇
综合类   337篇
社会学   6343篇
统计学   2216篇
  2021年   67篇
  2020年   189篇
  2019年   220篇
  2018年   244篇
  2017年   365篇
  2016年   282篇
  2015年   228篇
  2014年   253篇
  2013年   2049篇
  2012年   394篇
  2011年   317篇
  2010年   212篇
  2009年   234篇
  2008年   261篇
  2007年   278篇
  2006年   216篇
  2005年   350篇
  2004年   296篇
  2003年   257篇
  2002年   268篇
  2001年   314篇
  2000年   297篇
  1999年   309篇
  1998年   209篇
  1997年   204篇
  1996年   214篇
  1995年   188篇
  1994年   204篇
  1993年   177篇
  1992年   236篇
  1991年   232篇
  1990年   211篇
  1989年   219篇
  1988年   194篇
  1987年   185篇
  1986年   189篇
  1985年   174篇
  1984年   207篇
  1983年   200篇
  1982年   165篇
  1981年   137篇
  1980年   139篇
  1979年   166篇
  1978年   136篇
  1977年   119篇
  1976年   102篇
  1975年   101篇
  1974年   95篇
  1973年   93篇
  1971年   64篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
921.
Long‐distance migration is a primary source of language contact. Those who voluntarily migrate, though, may not resemble the broader population: psychological research suggests some factors that predispose people to become migrants also tend to lead to more openness to trying new things, potentially including linguistic features. This implies differential reactions to language contact, so inferences drawn from migrants may not generalize to the language‐contact process more generally. To test this hypothesis, this article examines lexical patterns in the 1940 United States census, focusing on who used the title mortician or funeral director rather than the traditional undertaker. Individuals who had moved from their state of birth were particularly likely to use the newer terms, even when explicitly controlling for the distribution of titles among the states from which the movers relocated. The personal characteristics leading people to encounter new linguistic environments may also independently affect their choices within those environments.  相似文献   
922.
Iceland's parental leave system, granting mothers and fathers equal benefits, may be interpreted as part of the development in the Nordic countries towards a dual-earner/dual-caregiver model. Even though uptake studies show fathers' increased participation in childcare, the use of the entitlement varies and a gendered pattern persists. This paper is based on interviews with 14 Icelandic couples who find themselves in a situation where they have to bridge a care gap between parental leave and state-subsidized childcare. While mothers tend to stretch their part of the leave on the argument that six months is too short a leave, fathers generally find three months to be long enough. The discussion revolves around the question of the relationship between difference and equality, inspired by Andrea Doucet's (2006) concept of strategic essentialism. May we envision a policy system that takes into consideration the way people invest in gender and at the same time develop policy measures that facilitate gender equality?  相似文献   
923.
Urban plant biodiversity is influenced by both the physical environment and attitudes and preferences of urban residents for specific plant types. Urban residents are assumed to be disconnected from their immediate environment, and cultural and societal factors have been emphasized over environmental factors in studies of landscaping choices. However, we postulate that local climatic and environmental factors can also affect preferences for plant attributes. Therefore, spatial and temporal patterns in urban tree biodiversity may be driven not only by the direct effect of environmental variables on plant function, but also by the effect of environmental variables on attitudes toward trees and associated choices about which types of trees to plant. Here, we tested the relative effects of socio-economic and local environmental factors on preferences toward tree attributes in five counties in southern California in and surrounding Los Angeles, based on 1,029 household surveys. We found that local environmental factors have as strong an effect on preferences for tree attributes as socio-economic factors. Specifically, people located in hotter climates (average maximum temperature 25.1 °C) were more likely to value shade trees than those located in cooler regions (23.1 °C). Additionally, people located in desert areas were less likely to consider trees to be important in their city compared with people located in naturally forested areas. Overall, our research demonstrates the inherent connections between local environmental factors and perceptions of nature, even in large modern cities. Accounting for these factors can contribute to the growing interest in understanding patterns of urban biodiversity.  相似文献   
924.
Where Would I Be Without You, the first and only poetry recording from Olivia Records, offers a glimpse into the powerful friendship and artistic collaboration between poets Pat Parker and Judy Grahn. Grahn and Parker met in Oakland, California in 1970, beginning an artistic collaboration and a powerful friendship that endured through Parker's death in 1989. Grahn's and Parker's work spread the good news of poetry; they were integral to how we lesbians imagined our voices in the world. The articles in this special issue reconsider and pay tribute to their work.  相似文献   
925.
It has been argued that transracially adopted children have increased risk of problems related to self-esteem and ethnic identity development. We evaluated this hypothesis across four groups of transracial adoptees: Asian (n = 427), Latino (n = 28), Black (n = 6), mixed/other (n = 20), and same-race White adoptees (n = 126) from 357 adoptive families. No mean differences were found in adoptees’ ratings of affect about adoption or of curiosity about birth parents. Some differences were found in general identity development and adjustment. There were notable differences in communication about race/ethnicity across groups and between parent and child report.  相似文献   
926.
927.
In biomedical research, two or more biomarkers may be available for diagnosis of a particular disease. Selecting one single biomarker which ideally discriminate a diseased group from a healthy group is confront in a diagnostic process. Frequently, most of the people use the accuracy measure, area under the receiver operating characteristic (ROC) curve to choose the best diagnostic marker among the available markers for diagnosis. Some authors have tried to combine the multiple markers by an optimal linear combination to increase the discriminatory power. In this paper, we propose an alternative method that combines two continuous biomarkers by direct bivariate modeling of the ROC curve under log-normality assumption. The proposed method is applied to simulated data set and prostate cancer diagnostic biomarker data set.  相似文献   
928.
We show that the rearrangement algorithm (RA) introduced in Puccetti and Rüschendorf (2012 Puccetti, G., Rüschendorf, L. (2012). Computation of sharp bounds on the distribution of a function of dependent risks. Journal of Computational and Applied Mathematics 236(7):18331840.[Crossref], [Web of Science ®] [Google Scholar]) to compute distributional bounds can be used also to compute sharp lower and upper bounds on the expected value of a supermodular function of d random variables having fixed marginal distributions. Compared to the analytical methods existing in the literature the algorithm is widely applicable, more easily obtained and gives insight into the dependence structures attaining the bounds.  相似文献   
929.

Sustainable landscaping programs are voluntary initiatives that recommend a set of practices to improve the environmental quality of urban ecosystems by providing landscaping materials, guidelines, and educational resources. Our goal was to examine the recommendations and outcomes of these programs in the United States and their value for encouraging conservation practices in residential ecosystems. We conducted a comprehensive web search and identified 193 sustainable landscaping programs in the United States. Programs aim to increase native species richness, affordably manage stormwater runoff, and offer residents meaningful experiences with nature. Sustainable landscaping programs present many opportunities to engage people with local ecological knowledge and conservation practices, provide accessible spaces for environmental education, cultivate interdisciplinary research collaborations, and advance inclusion in conservation. However, assessments of their ecological value are rare, leaving many questions surrounding the benefits to biodiversity and water quality afforded by participation. Many programs also require investments in landscaping materials and certification fees that might limit participation by some households. Future work should examine how recommended practices influence urban biodiversity, identify and address barriers to participation, and generate social-ecological knowledge that can inform future programs.

  相似文献   
930.

Wealth aggregates implied by the Household Finance and Consumption Survey (HFCS) usually yield much lower amounts than macroeconomic statistics reported in the National Accounts. An important source of this gap may be the under-representation of the wealthiest households in the HFCS. This article therefore combines a semi-parametric Pareto model estimated from top survey data and observations from rich lists with a non-parametric stratification approach to quantify the impact of the missing wealthy households on component-specific micro-macro gaps. We find that unadjusted micro data substantially underestimates wealth inequality. The largest effects are documented for equity. For other components, the missing wealthy explain less than ten percentage points of the micro-macro gap. We find that differences in oversampling strategies limit the cross-country comparability of unadjusted survey-implied wealth distributions and that our top tail adjustment leads to measures that are internationally better comparable.

  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