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   15407篇
  免费   548篇
  国内免费   15篇
管理学   1680篇
民族学   87篇
人才学   2篇
人口学   1386篇
丛书文集   153篇
理论方法论   1565篇
综合类   713篇
社会学   8639篇
统计学   1745篇
  2023年   114篇
  2022年   67篇
  2021年   120篇
  2020年   259篇
  2019年   311篇
  2018年   420篇
  2017年   603篇
  2016年   415篇
  2015年   325篇
  2014年   403篇
  2013年   2981篇
  2012年   557篇
  2011年   555篇
  2010年   446篇
  2009年   371篇
  2008年   459篇
  2007年   471篇
  2006年   483篇
  2005年   411篇
  2004年   337篇
  2003年   286篇
  2002年   301篇
  2001年   366篇
  2000年   297篇
  1999年   281篇
  1998年   211篇
  1997年   180篇
  1996年   169篇
  1995年   183篇
  1994年   179篇
  1993年   182篇
  1992年   201篇
  1991年   196篇
  1990年   196篇
  1989年   167篇
  1988年   173篇
  1987年   197篇
  1986年   155篇
  1985年   164篇
  1984年   185篇
  1983年   159篇
  1982年   152篇
  1981年   136篇
  1980年   119篇
  1979年   127篇
  1978年   100篇
  1977年   82篇
  1976年   94篇
  1975年   113篇
  1974年   86篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
This study focused on a specific risky practice common among contemporary college students: the hookup. Hookups are defined as a sexual encounter which may or may not include sexual intercourse, usually occurring on only one occasion between two people who are strangers or brief acquaintances. The aim of this study was to determine the relative importance of a variety of social and psychological predictors in understanding differences among undergraduate students who had never hooked up, those who had hooked up without sexual intercourse, and those who had hooked up with sexual intercourse. Analyses revealed that, as predicted, social, individual, and relational psychological variables helped to explain the variance among college students' varied hookup experiences. By examining the full range of sexual involvement characteristic of the casual sexual phenomenon of hooking up within a multivariate model, we were able to achieve a more differentiated understanding of college students' casual sexual experimentation.  相似文献   
992.
Urbanisation is widely considered to promote the establishment of non-native species, but there is limited empirical evidence of the ecological factors driving their responses. The grey squirrel Sciurus carolinensis (Gmelin 1788) is native to North America, but is widespread in the UK and is starting to spread across Europe. It is regarded as one of the world’s worst invasive animals due to its adverse impacts on native biodiversity. We use the non-native grey squirrel population in Sheffield (UK) as a case study to assess which factors limit its distribution and abundance in urban environments. In 2010 the city-wide population of adult squirrels peaked at an estimated 6539 in autumn (0.46 squirrels/ha), with maximum local densities of 8.29/ha. These densities appear to be slightly lower than those recorded in urban environments in the species’ native range. Grey squirrels occurred more frequently at urban sites with larger amounts of green-space in the surrounding region. Local habitat characteristics were, however, more powerful predictors of urban grey squirrel occurrence and abundance than regional availability of green space. Canopy cover, seed bearing trees and supplementary feeders, provided for garden birds, positively influenced grey squirrels. The potential for grey squirrels to connect city dwellers with nature thus appears to be highest in urban locations that have considerable capacity to support native biodiversity. The beneficial impacts of supplementary feeding on grey squirrel populations is notable given concerns that squirrels can adversely influence bird populations. These habitat associations also imply that grey squirrels typically respond negatively to urbanisation, which challenges arguments that urbanisation favours exotic species.  相似文献   
993.
After 20 years of service in the British Army in India, Sir Lionel Smith, KCB (1777–1842) was appointed Governor of Barbados and Governor General of the Windward Islands in order to enact the abolition of slavery in the West Indies. During his three-year tenure, Smith relied on two major rhetorical strategies to advocate for the rights of free Afro-Barbadians and enslaved/apprenticed people. In general, Smith invoked utilitarian arguments, derived from his experience in India, when presenting free Afro-Barbadian men’s demands for equal voting rights, but also resorted to a more humanitarian mode, characteristic of abolitionist rhetoric, when arguing for judicial system reforms that would benefit enslaved and apprenticed people. This essay analyzes the ways in which Smith’s positions resonated with or diverged from those of the Colonial Office, and from those of Barbadian people of color, based on correspondence with the Colonial Office, including two documents written by free men of color, and one by an apprentice. Although Smith was eager to apply the British colonial policy he experienced in India to the impending social changes in the West Indies, the Colonial Office was not as willing to draw these parallels, responding more enthusiastically to Smith’s use of abolitionist rhetoric.  相似文献   
994.
Using data drawn from telephone interviews with Ohio Works First program managers (N = 69), we examine managers' moral identity work. This work included using militarized rhetoric to evoke moral identities as honorable workers. It also involved signifying helper/helpful moral identities by defining what it means to be helpful, legitimating their helper identity through connections to caseworkers, and affirming their identity through telling success stories. Additionally, managers implicitly othered clients they viewed as needy and politicians they considered to be out‐of‐touch. Our research contributes to the literature on welfare‐to‐work, but also more broadly to our understanding of moral identity work and implicit othering.  相似文献   
995.
Bistrategic resource control entails using both coercive and prosocial strategies in competition for resources. The present study sought to clarify whether bistrategic involves more than simply using both strategies some of the time. Examining 88 preschoolers' coercion and prosociality over an entire school year, results showed that coercive resource control was used most frequently at the start of the school year, presumably to access resources and establish social dominance. Rates of prosocial resource control increased over the school year, and socially dominant preschoolers showed higher rates compared with peers, presumably to maintain resource control while keeping peers as allies. Socially dominant preschoolers also used reconciliation more often than peers, resulting in higher rates of affiliation between former competitors and more positive peer regard from fall to spring. Findings are discussed in terms of resource control theory and the importance of situating social behaviors within the behavioral and relationship context in which they are embedded.  相似文献   
996.
High species diversity is argued to be the most important requisite for a resilient urban forest. In spite of this, there are many cities in the northern hemisphere that have very limited species diversity within their tree population. Consequently, there is an immense risk to urban canopy cover, if these over-used species succumb to serious pests or pathogens. Recognition of this should motivate the use of less commonly used species. Analysis of plant traits, such as the leaf water potential at turgor loss (ΨP0), can provide useful insights into a species’ capacity to grow in warm and dry urban environments. Therefore, the aim of this study was to evaluate ΨP0 of 45 tree species, the majority of which are rare in urban environments. To help evaluate the potential for using ΨP0 data to support future decision-making, a survey of professionals engaged with establishing trees in urban environments was also used to assess the relationship between the measured ΨP0 and the perceived drought tolerance of selected species. This study demonstrates that ΨP0 gives strong evidence for a species’ capacity to tolerate dry growing conditions and is a trait that varies substantially across species. Furthermore, ΨP0 was shown to closely relate to the experience of professionals involved in establishing trees in urban environments, thus providing evidence of its practical significance. Use of plant traits, such as ΨP0, should, therefore, give those specifying trees confidence to recommend non-traditional species for challenging urban environments.  相似文献   
997.
A novel family of mixture models is introduced based on modified t-factor analyzers. Modified factor analyzers were recently introduced within the Gaussian context and our work presents a more flexible and robust alternative. We introduce a family of mixtures of modified t-factor analyzers that uses this generalized version of the factor analysis covariance structure. We apply this family within three paradigms: model-based clustering; model-based classification; and model-based discriminant analysis. In addition, we apply the recently published Gaussian analogue to this family under the model-based classification and discriminant analysis paradigms for the first time. Parameter estimation is carried out within the alternating expectation-conditional maximization framework and the Bayesian information criterion is used for model selection. Two real data sets are used to compare our approach to other popular model-based approaches; in these comparisons, the chosen mixtures of modified t-factor analyzers model performs favourably. We conclude with a summary and suggestions for future work.  相似文献   
998.
Objective. List experiment respondents may misreport the number of list items that they associate with in order to associate themselves with a socially desirable test item or to disassociate themselves from a socially undesirable test item. Tests for such misreporting were conducted. Methods. List experiments from the 1991 National Race and Politics Survey, the 2006 Cooperative Congressional Election Study, and the 2008 Cooperative Campaign Analysis Project were analyzed or reviewed. Results. Evidence suggested that some respondents deflated their report more than necessary to avoid association with a socially undesirable test item. Conclusions. List experiments may provide inaccurate estimates of the percentage of the population to which the test item applies, but the direction of bias is predictable.  相似文献   
999.
In this article, using multiple illustrative case examples, we demonstrate that philanthropic institutions are in the business of creating public value. In framing the work of philanthropy more broadly to include the process of public value creation, philanthropic institutions and leaders are challenged to be more strategic not only in their mission‐fulfillment grant‐making with nonprofit organizations but also in the way they stimulate and encourage collaboration, create the “third space” necessary to incubate ideas to transform society, and leverage resources to increase the return on their investments toward system‐wide change. The implications for philanthropic actors and institutions suggest that the strategic contributions they make toward creation of public value are those that go beyond transactional performance measures, such as number of dollars spent or clients receiving services, to include ways that their investments are amplified by meaningful partnerships with nonprofit and other organizations, changed behaviors of institutions and individuals, and transformative public policies.  相似文献   
1000.
No abstract available for this article.  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