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   2312篇
  免费   149篇
各国政治   146篇
工人农民   104篇
世界政治   296篇
外交国际关系   152篇
法律   1010篇
中国政治   19篇
政治理论   708篇
综合类   26篇
  2023年   22篇
  2022年   20篇
  2021年   25篇
  2020年   76篇
  2019年   87篇
  2018年   91篇
  2017年   125篇
  2016年   107篇
  2015年   77篇
  2014年   77篇
  2013年   280篇
  2012年   117篇
  2011年   97篇
  2010年   101篇
  2009年   84篇
  2008年   109篇
  2007年   98篇
  2006年   86篇
  2005年   83篇
  2004年   71篇
  2003年   55篇
  2002年   66篇
  2001年   49篇
  2000年   36篇
  1999年   34篇
  1998年   32篇
  1997年   21篇
  1996年   24篇
  1995年   29篇
  1994年   19篇
  1993年   14篇
  1992年   17篇
  1991年   23篇
  1990年   19篇
  1989年   14篇
  1988年   14篇
  1987年   13篇
  1986年   20篇
  1985年   18篇
  1984年   13篇
  1983年   5篇
  1982年   16篇
  1981年   8篇
  1980年   14篇
  1979年   8篇
  1978年   6篇
  1977年   7篇
  1972年   4篇
  1967年   6篇
  1966年   3篇
排序方式: 共有2461条查询结果,搜索用时 250 毫秒
1.
Whom do ordinary Syrians support in their civil war? After decades of repression, the Syrian uprising unleashed an outpouring of political expression. Yet the study of Syrian public opinion is in its infancy. This article presents survey evidence from a large, diverse sample of Syrian refugees in neighbouring Lebanon, one of the first of its kind, and examines their support for the different factions fighting in the civil war. In so doing, it demonstrates that many conventional narratives of the conflict are oversimplifications of a more complex reality. The survey shows that the majority of Syrian refugees support one faction or another of the opposition, but a large minority sympathizes with the government. In line with existing accounts of the war, the government draws its popular support base from wealthier and less religious Syrians, as well as minorities. Nonetheless, large numbers of Sunni Arabs also side with the government, belying sectarian narratives of the war. The survey also finds that supporters of the opposition Islamists and non-Islamists are similar in many regards, including religiosity. The main distinction is that the non-Islamist support base is far more politically attentive than are Islamist sympathizers, in contrast to existing narratives of the war.  相似文献   
2.
Journal of Youth and Adolescence - Asian Americans are simultaneously stereotyped as a perpetual foreigner and a model minority. This cross-sectional study of 308 Filipino American youth (mean age...  相似文献   
3.

Young adulthood represents a developmental period with disproportionately heightened risk of losing a job. Young adult unemployment has been linked to increased mental health problems, at least in the short term. However, their possible long-term impacts, often referred as “scarring effects,” have been understudied, possibly underestimating the magnitude of mental health burden that young adult unemployment generates. This longitudinal study examined whether duration of unemployment during young adulthood is associated with later mental health disorders, after accounting for mental and behavioral health problems in childhood. Furthermore, the current study investigated whether childhood neighborhood characteristics affect this association and if so, in what specific functional ways. Data were drawn from a longitudinal study of developmental outcomes in a community sample in Seattle. Data collection began in 1985 when study participants were elementary students and involved yearly assessments in childhood and adolescence (ages 10–16) and then biennial or triennial assessments (ages 18–39; N?=?677 at age 39; 47% European American, 26% African American, 22% Asian American, and 5% Native American; 49% female). The current study findings suggest that duration of unemployment across young adulthood increased mental health problems at age 39, regardless of gender. Childhood neighborhood characteristics, particularly their positive aspect, exerted independent impacts on adult mental health problems beyond unemployment experiences across young adulthood. The current findings indicate a needed shift in service profiles for unemployed young adults—a comprehensive approach that not only facilitates reemployment but also addresses mental health needs to help them to cope with job loss. Further, the present study findings suggest that childhood neighborhoods, particularly positive features such as positive neighborhood involvement, may represent concrete and malleable prevention targets that can curb mental health problems early in life.

  相似文献   
4.
In response to research demonstrating that irrelevant contextual information can bias forensic science analyses, authorities have increasingly urged laboratories to limit analysts' access to irrelevant and potentially biasing information (Dror and Cole (2010) [3]; National Academy of Sciences (2009) [18]; President's Council of Advisors on Science and Technology (2016) [22]; UK Forensic Science Regulator (2015) [26]). However, a great challenge in implementing this reform is determining which information is task-relevant and which is task-irrelevant. In the current study, we surveyed 183 forensic analysts to examine what they consider relevant versus irrelevant in their forensic analyses. Results revealed that analysts generally do not regard information regarding the suspect or victim as essential to their analytic tasks. However, there was significant variability among analysts within and between disciplines. Findings suggest that forensic science disciplines need to agree on what they regard as task-relevant before context management procedures can be properly implemented. The lack of consensus about what is relevant information not only leaves room for biasing information, but also reveals foundational gaps in what analysts consider crucial in forensic decision making.  相似文献   
5.
Species identification of necrophagous insects found on a dead body is an essential key in applying medicolegal entomology to the estimation of postmortem interval (PMI). Due to limited morphological identification of insect evidence, several studies have identified species using molecular information such as DNA markers. While considerable cytochrome c oxidase subunit I (COI) gene sequence data of necrophagous fly species have been collected and annotated, those of necrophagous beetle species have not. Since necrophagous beetles such as Dermestes species have a larval period longer than that of flies, beetles are useful in even the late decomposition phase in estimating minimum PMI. To obtain the full-length COI gene sequences of six Dermestes species collected from South Korea, we designed primers for polymerase chain reaction amplification and sequencing. The obtained full COI nucleotide sequences were used for performing phylogenic analysis and comparison with previously reported sequences. The results demonstrated that the COI gene sequences could be used to identify forensically important Dermestes species in South Korea.  相似文献   
6.
ABSTRACT

Increasingly, a diverse set of policy communities, including those with defence, development and environmental mandates, frame climate change as a security threat. Most often this discursive formation labels climate change as a ‘threat multiplier’. This framing, however, is vague, linear and leaves many questions unanswered regarding how institutions can develop and implement policy that addresses the joint challenges of climate change, conflict and security. Utilising a mixed-methods approach, and grounding data collection in US policy communities, this article examines how policy actors and institutions integrate climate-security discourses into policy processes. The objective of this research is to provide direct insight into how the discourses and technical understandings of climate-security transition into policy priorities and implementation realities. This research identified three common approaches to climate-security: (1) A challenge of adaptation and resilience; (2) A potent political argument; and (3) An issue of limited importance and feasibility. These approaches, however, are inconsistent across sectors and within organisations, suggesting a lack of cohesion and considerable challenges in identifying and responding to climate change as a ‘threat multiplier’.  相似文献   
7.
8.
9.
10.
The EPA implements its policy of exhaust emission control by setting standards specified in terms of grams of pollutants per mile traveled. As a result, the tax must first restrain the vehicle miles traveled (VMT) if it is to have an impact on emission at all. EPA's choice of miles traveled as the medium through which its policy of pollution control must run is unfortunate, because travel is an activity that people resist giving up. This is reflected in a low long-run price elasticity of travel demand. Consequently, it takes substantial increases in the gasoline tax to make an impact on long-run travel demand. Simulation results show that under an alternative policy option, where EPA's standards are specified in terms of grams of pollutant per gallon of fuel burned, the same long-run reduction in exhaust emissions achievable today can be achieved (at an even higher level of confidence) with less than one-tenth of the increase in gasoline price required under the existing policy regime.  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