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   3212篇
  免费   132篇
  国内免费   66篇
管理学   175篇
民族学   34篇
人口学   92篇
丛书文集   402篇
理论方法论   164篇
综合类   2221篇
社会学   182篇
统计学   140篇
  2024年   7篇
  2023年   20篇
  2022年   52篇
  2021年   73篇
  2020年   42篇
  2019年   47篇
  2018年   65篇
  2017年   77篇
  2016年   63篇
  2015年   101篇
  2014年   166篇
  2013年   220篇
  2012年   205篇
  2011年   260篇
  2010年   260篇
  2009年   315篇
  2008年   273篇
  2007年   237篇
  2006年   233篇
  2005年   185篇
  2004年   136篇
  2003年   96篇
  2002年   108篇
  2001年   69篇
  2000年   50篇
  1999年   11篇
  1998年   5篇
  1997年   5篇
  1996年   5篇
  1995年   4篇
  1994年   4篇
  1993年   2篇
  1992年   3篇
  1990年   2篇
  1988年   2篇
  1987年   1篇
  1985年   1篇
  1984年   2篇
  1977年   1篇
  1968年   1篇
  1966年   1篇
排序方式: 共有3410条查询结果,搜索用时 46 毫秒
61.
Objective: To describe sexual practices in Mexican lesbian and bisexual women. Materials and method: An online survey was conducted with a nonprobabilistic sample of self-identified lesbian (n?=?768) and bisexual (n?=?371) women from the 32 states of Mexico. Results: Lesbians less frequently reported having had sex with a man than bisexual women. Preferred sexual practices with other women were external genital stimulation with fingers, internal genital stimulation with fingers, and oral genital stimulation. Most (~80%) participants did not use protection to prevent sexually transmitted infections. Conclusions: Our results can inform the design of promotion and prevention programs in sexual health aimed at sexual minority women.  相似文献   
62.
对含有抽象属性的多属性层次结构而言,层次分析法即AHP(包括DIS-AHP、ABS-AHP、IDE-AHP和SUP-AHP四种具体方法)会因比率比较基准缺失、权重内涵模糊不清或方案评价不保序而缺乏科学理性。为发展AHP,基于摆幅置权(SW)判断模式和多属性决策属性价值公度方法,首先给出了能为层次结构抽象属性上的SW判断提供支持的规约性多属性决策属性价值公度方法,然后由此并结合多属性价值理论给出了能够克服现有层次分析法内在缺陷的目标导向层次分析方法即ToAHP。相对于AHP,ToAHP在判断模式与权重内涵、方法建构的理论基础和相关假设检验、方案评价保序与其内在数理依据上具有明显的相对科学合理性。应用分析表明:在输入信息可比的条件下,ToAHP明显优于AHP的四种分析方法之中最具可信性的SUP-AHP方法。  相似文献   
63.
在信息技术的发展背景下,网络侵权数量呈现直线飙升.关于网络服务提供者间接侵权责任的建立使权利人确认直接侵权人陷入困境.著作权领域的司法和实践为信息披露制度的建立奠定了良好的基础.立足我国的具体实际和网络现状,信息披露制度应当规定包括网络接入服务提供者在内的网络服务提供者均负有一定的信息披露义务,严格信息披露的条件,采用“通知与反通知”的履行方式,明确网络服务提供者信息披露制度下的责任分配,促使网络服务提供者制定统一的信息披露行业规定.  相似文献   
64.
In the early seventeenth century, important socioeconomic changes in the Spanish colony of Hispaniola brought about substantial shifts in race relations between white residents and peoples of African descent, who were enslaved and free. As the plantation system declined precipitously, white members of the Spanish elite started envisioning new roles for enslaved laborers, which included enrolling these enslaved peoples in their own intrigues against other elites. This cooperation led people in bondage to carry out violent attacks and assassination plots against other members of the white colonial society. People of African descent took advantage of these collaborations as an opportunity to advance their own interests within the community. Nevertheless, people of African descent faced fierce and often violent backlash if they acted of their own accord.  相似文献   
65.
Urbanization has been considered as a major threat to biodiversity, making its ecology of increasing interest. Many urban ecology studies have been developed in a short time-scale, measuring real-time patterns. However, long-term studies are imperative to understand the responses of some species to the urbanization process. In this study, we aimed to assess the information provided by a recent one-year citywide bird survey when compared to a published ‘historical’ bird list of a neotropical city (Xalapa, Mexico) that compiles information of the past three decades, mainly from urban greenspaces. Specifically, we contrasted species richness values and assessed differences in species composition between both lists. We recorded 51 species in the one-year citywide survey, representing ~15 % of those reported in the historical list. Nonetheless, the upper-bound confidence interval of the citywide survey richness prediction represented ~66 %. Most of the species recorded in the one-year citywide survey are insectivores and granivores, a pattern that agrees with previous findings that underline the importance of insectivores as part of urban bird communities in the Neotropics. Although we used robust methods to compare our one-year citywide bird list and the historical list for the city of Xalapa, we acknowledge the limitations of comparing them. However, our results shed some light on the kind and type of information that one-year citywide surveys can provide and the importance of long-term studies for comprehending the processes involved in biodiversity changes within urban areas over time. Undoubtedly, establishing long-term citywide surveys sampling birds and other biodiversity groups will allow us to better understand the response of biodiversity to urbanization over time.  相似文献   
66.
Objectives: Metabolic syndrome (MtS) and kidney stone are two common aging diseases with male dominant. This is the first study regarding the potential impact of MtS and its components on kidney stone in aging Chinese population.

Methods: A total of 694 males with a mean age of 55.6 years were enrolled. The definition of MtS was according to the modified criteria developed by the Bureau of Health Promotion in Taiwan. Subjects were classified as having a disease of kidney stones according to diagnosis by a physician with available medical records or evidence from ultrasonography judged by an investigator of urologist.

Results: Using age-adjusted multivariate logistic regression analysis, our results showed that subjects with kidney stone had significantly higher prevalence of MtS (p?=?0.04, OR?=?1.74, 95% CI: 1.0 1–3.00). The presence of MtS had significant correlation with kidney stone (p?=?0.01, OR?=?1.83, 95% CI: 1.1 4–2.93), which were associated with the increment of MtS components (p?p?Conclusions: In aging Taiwanese males, the presence of MtS and its components are strongly associated with kidney stone. Abnormal BP is the most significant risk component of MtS for kidney stone.  相似文献   
67.
让语料库说话已经成为了语言学界的一个共识,真实的语料结合理性的分析不仅是语言研究也是英语词汇学习的重要 途径。语料库在医学英语词汇教学中有着巨大的潜力,通过语料库检索软件,引导学生对真实自然的语料进行按部就班的分 析、模仿、学习、应用,可以在很大程度上提升医学英语的词汇学习效率。  相似文献   
68.
发展老年教育是实施积极老龄化战略的重要举措,课程建设是教育目标得以实现的基本保证.结合当前老年教育课程建设的不足,本文提出,老年教育课程建设应以健康、参与和保障三大支柱作为服务目标,着力从课程目标取向、课程内容建构、课程实施形式以及课程师资组成等方面回应和落实积极老龄化理念的要求.  相似文献   
69.
大学生社会实践活动到现在已经开展二十一年了,期间取得了辉煌的战果,引起了社会强烈的反响,同时也积累了许多问题。现在应该到了理性思考、解决问题,使社会实践整体推进的时候了。社会实践不是可有可无,而是要加强建设。  相似文献   
70.
行为主义的学习理论提倡学习外语应如同母语般的直接理解和使用,完全逾越翻译这一过程。而基于认知主义和建构主义的二语习得理论,则认为外语学习者应充分利用母语知识来认知和建构外语技能。其实翻译活动应为一种外语学习策略,它不仅可以当作一种认知、记忆、情感、社交和补偿学习策略,同时也能促进词汇、阅读、写作等外语技能的发展,并对不同程度的学习者起到积极的促进作用。  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