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   112916篇
  免费   5041篇
  国内免费   731篇
管理学   1697篇
劳动科学   15篇
民族学   2233篇
人才学   23篇
人口学   1398篇
丛书文集   16504篇
理论方法论   4609篇
综合类   85796篇
社会学   3978篇
统计学   2435篇
  2024年   75篇
  2023年   526篇
  2022年   788篇
  2021年   955篇
  2020年   1152篇
  2019年   1058篇
  2018年   1040篇
  2017年   1331篇
  2016年   1571篇
  2015年   2277篇
  2014年   5763篇
  2013年   5881篇
  2012年   7067篇
  2011年   8388篇
  2010年   6760篇
  2009年   6944篇
  2008年   7336篇
  2007年   9203篇
  2006年   9296篇
  2005年   8521篇
  2004年   7921篇
  2003年   7885篇
  2002年   6319篇
  2001年   5415篇
  2000年   2788篇
  1999年   770篇
  1998年   358篇
  1997年   258篇
  1996年   215篇
  1995年   162篇
  1994年   115篇
  1993年   86篇
  1992年   102篇
  1991年   50篇
  1990年   24篇
  1989年   25篇
  1988年   29篇
  1987年   12篇
  1986年   12篇
  1985年   31篇
  1984年   38篇
  1983年   27篇
  1982年   27篇
  1981年   14篇
  1980年   17篇
  1979年   23篇
  1978年   21篇
  1977年   4篇
  1976年   3篇
  1975年   4篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Objective: The objective of this study was to understand substance use patterns of alcohol, marijuana, and simultaneous alcohol and marijuana (SAM) use among 2- and 4-year college students. Participants: Participants were 526 young adults aged 18–23 (n?=?355 4-year students; n?=?171 2-year students) recruited from February 2015 to January 2016 who were participating in a larger longitudinal study. Methods: Latent class analysis (LCA) was used to identify past-month classes of alcohol, marijuana, and SAM use. Results: Among both 2- and 4-year students, a four-class solution yielded the best-fitting model, with 2-year classes tending to include greater marijuana use and less alcohol use and 4-year classes tending to include heavy alcohol use. Demographic characteristics were largely similar across classes. Conclusions: Classes of alcohol, marijuana, and SAM use differed by education status. Screening and prevention efforts for 4-year students may need to be tailored for the needs of 2-year students.  相似文献   
82.
Objective: To examine differences in complete response rates for depression screening questions based on demographic characteristics. Methods: Cross-sectional study examining associations between demographic characteristics and completely responding depression-screening questions. Participants: “Healthy Minds Study” data, collected in a public University in February 2016, where 7,326 students participated. Results: women (AOR: 0.69; 95% CI =0.57–0.83) and gay/lesbian students (AOR: 0.24; 95% CI =0.10–0.60) had better complete response rates. Non-US (AOR: 1.46; 95% CI =1.03–2.07), black (AOR: 3.32; 95% CI =1.92–5.77), and Middle-Eastern students (AOR: 3.73; 95% CI =1.73–8.02) had lower complete response rates. Conclusions: Our study shows sex, gender, citizenship, and race categories have significant differences in complete response rates for the outcome. Our findings have several implications; including recognizing interventions for depression based on responders may not target those that tend to be “partial-responders”. Efforts in survey design, recruiting and completion of surveys should be maximized.  相似文献   
83.
本文研究了空气中多种醛酮的测定。目前国内仅对空气中甲醛的测定研究较多,国外报导的方法需用萃取、浓缩等一系列前处理过程,方法麻烦,易引入杂质造成污染。本文报导的方法系采用2.4—二硝基苯肼的甲醇强酸溶液吸收空气中醛酮直接注入液相色谱仪中进行分离测定。研究表明:本法分离效果好,重复性好,方法简便,速度快,测定的精密度和准确度符合微量分析误差的要求。  相似文献   
84.
The purpose of this brief is to present several case vignettes that illustrate omissions in the investigation of elder deaths. These vignettes demonstrate the need for a standardized approach in the conduct of medicolegal investigations of fatal elder abuse. For each of the described oversights, a recommendation is offered to address the gap in investigation processes, which in turn could improve the determination of cause and manner of elder death. Inherent limitations of resources and practical realities of death investigation are discussed and recommendations are made for future research. Viewed broadly, deficiencies in elder death investigations can lead to the underreporting of elder abuse and the reduction of legal options for victims, which may reflect a systemic pattern of social injustice.  相似文献   
85.
ABSTRACT

We urgently need a new global solidarity movement, but it will not be shaped like the old ones, with failing solidarity when it is most needed or at the service of anti-imperialist regimes. What we need, urgently, is a global movement for a just transition, combining social and environmental justice, as well as a strong movement against re-emerging fascism, in North and South.  相似文献   
86.
现阶段,我国步入了创新驱动引领升级的关键时期,科技创新受到了整个社会的空前重视。科技保险作为分散和转移科技风险的重要手段,可以为科技创新提供有力的风险保障。目前,我国科技保险工作已经进入全面推广阶段,虽然取得了一定的成效,但整体运行并不理想,科技企业参保率低,科技保险缺失严重。究其原因,主要在于制度供给不能适应科技企业对科技保险的需求,科技保险制度供求非均衡,在现行的科技保险制度下积聚着大量的潜在利润,而这些潜在利润既是科技保险制度非均衡的原因,又是科技保险制度创新的动力。  相似文献   
87.
Portfolio evaluation is the evaluation of multiple projects with a common purpose. While logic models have been used in many ways to support evaluation, and data visualization has been used widely to present and communicate evaluation findings, adopting logic models for portfolio evaluation and using data visualization to share findings simultaneously is surprisingly limited in the literature. With the data from a sample portfolio of 209 projects which aims to improve the system of early care and education (ECE), this study illustrated how to use logic model and data visualization techniques to conduct a portfolio evaluation by answering two evaluation questions: “To what extent are the elements of a logic model (strategies, sub-strategies, activities, outcomes, and impacts) reflected in the sample portfolio?” and “Which dominant paths through the logic model were illuminated by the data visualization technique?” For the first question, the visualization technique illuminated several dominant strategies, sub-strategies, activities, and outcomes. For the second question, our visualization techniques made it convenient to identify critical paths through the logic model. Implications for both program evaluation and program planning were discussed.  相似文献   
88.
This article studies the voters of DENK, the first immigrant party to gain seats in a national parliament. It builds further on the existing literature on how immigrants and people from immigrant descent vote in Western European countries. From the literature we derive seven expectations about the kind of voters that are likely to vote for an immigrant party in terms of their political cynicism, attitudes towards economic, globalisation and moral issues. We find that DENK voters are younger Muslims, who have conservative views on moral matters, cynical attitudes towards politics, right-wing views on economic matters and progressive views on issues that pertain to the globalisation dimension, such as immigration, integration and Islam and in particular discrimination. This article uses VAA data to construct a matched sample that in terms of key variables is representative for voters with and without a migration background.  相似文献   
89.
在"一带一路"倡议下,云南省近年来与南亚、东南亚国家之间的教育合作不断加强,取得了可喜的成绩。基于云南省与南亚、东南亚国家的中外合作办学数据,考察云南省中外合作办学现状,发现云南省中外合作办学还存在留学生生源面窄且学历层次低、中外合作办学规模小且办学层次不高、联合科学研究产出能力较弱等问题。因此,应从国家层面、当地政府层面、大学层面分别采取相应措施,大力促进大学国际化发展,完善大学国际化的体制机制与法律监管,搭建更多国际合作平台。当地政府应加强大学国际化的统筹规划、综合协调和宏观管理,省域大学应加大国际化保障条件的建设力度。  相似文献   
90.
以风险理论审视非物质文化遗产的现行法律制度,根据风险产生根源不同,非物质文化遗产保护的制度风险会表现为制度运转失灵风险、制度功能偏差风险和公平性缺失风险。化解制度风险,形成制度风险的维度,不可基于同一个标准,而是需要在大的框架之下论及制度风险的法律管控,需要有针对性地创构"建立私权,善用公权"的多元法律控制体系,并在体系内引入技术规制,创设"非物质文化遗产权",推动民间习惯法与法律制度、公法与私法的互动式发展。  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