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   715篇
  免费   28篇
各国政治   45篇
工人农民   87篇
世界政治   50篇
外交国际关系   33篇
法律   366篇
中国政治   6篇
政治理论   152篇
综合类   4篇
  2024年   3篇
  2023年   8篇
  2022年   7篇
  2020年   12篇
  2019年   13篇
  2018年   19篇
  2017年   26篇
  2016年   31篇
  2015年   15篇
  2014年   14篇
  2013年   92篇
  2012年   18篇
  2011年   22篇
  2010年   20篇
  2009年   22篇
  2008年   23篇
  2007年   30篇
  2006年   29篇
  2005年   25篇
  2004年   31篇
  2003年   23篇
  2002年   14篇
  2001年   12篇
  2000年   13篇
  1999年   14篇
  1998年   14篇
  1997年   11篇
  1996年   13篇
  1995年   7篇
  1994年   14篇
  1993年   14篇
  1992年   11篇
  1991年   13篇
  1990年   18篇
  1989年   5篇
  1988年   11篇
  1987年   2篇
  1986年   3篇
  1985年   12篇
  1984年   8篇
  1983年   10篇
  1982年   6篇
  1981年   3篇
  1980年   4篇
  1979年   6篇
  1977年   3篇
  1975年   6篇
  1974年   2篇
  1972年   2篇
  1970年   2篇
排序方式: 共有743条查询结果,搜索用时 0 毫秒
51.
52.
This article analyzes the impact of policy variables--employer accommodations, state Social Security Disability Insurance (DI) allowance rates, and DI benefits--on the timing of an application for DI benefits by workers with a work-limiting health condition starting when their health condition first begins to bother them. The analysis uses a rich mixture of personal and employer characteristics from the Health and Retirement Study linked to Social Security administrative records. We find that most workers do not apply immediately for DI benefits when they are first bothered by a health condition. On the contrary, the median working-age man with a work-limiting condition waits 7 years after that time before applying, and the median working-age woman waits 8 years. Although the risk of applying for benefits is greatest in the year following onset, only 16 percent of men and 13 percent of women in our sample apply within the first year, and the risk of application falls thereafter. That finding suggests that institutional factors, in addition to health factors, may play a role in the timing of DI applications. Using kernel density estimates of the distribution of application and nonapplication ordered by state allowance rates (the rate of acceptance per DI determination in each state), we find that both men and women who live in states with high allowance rates are disproportionately more likely to apply for benefits in the first year after their condition begins to bother them than are those in states with low allowance rates. Using life-table analysis, we also find that men and women who are accommodated by their employers are significantly less likely to apply for DI benefits in each of the first few years after their condition begins to bother them than are those who are not accommodated. On the basis of this evidence, we include these policy variables in a model of the timing of DI application that controls for other socioeconomic variables as well as health. Using a hazard model, we find that workers who live in states with higher allowance rates apply for DI benefits significantly sooner than those living in states with lower allowance rates following the onset of a work-limiting health condition. Workers who are accommodated following the onset of a work-limiting health condition, however, are significantly slower to apply for DI benefits. Using the mean values of all explanatory variables, we estimate the relative importance of changes in these policy variables on the speed with which workers apply for benefits after onset. We find that the mean time until application for men is 10.22 years. Universal accommodations following onset would delay application by 4.36 years. In contrast, a 20 percent decrease in state allowance rates would delay application by only 0.88 years. For working-age women, the average expected time until application once a condition begins to bother them is 10.58 years. Universal accommodations would delay that by 3.76 years, and a 20 percent decrease in allowance rates would delay it by 1.47 years. A complication in this analysis is that the policy variables are to some degree endogenous. Accommodation is probably offered more often to workers who want to continue working. Allowance rates are chosen by states on the basis of federal policy and local choices and probably in part on the health condition of workers in the state. Therefore, our estimates are upper bounds of these policy effects. Still, we believe we provide evidence that the social environment faced by workers with work-limiting health conditions can significantly influence their decision to apply for DI benefits, holding their specific health conditions constant.  相似文献   
53.
54.
This study examines the association of self-perceptions with sixth to eighth graders' exposure to mixed-sex and dating contexts. It contrasts two hypotheses: the stress hypothesis, which suggests that the transition to romantic relationships will be associated with declines in self-esteem, especially for girls, and the leisure hypothesis, which suggests that movement into a desired role in an emotionally positive social context will be associated with positive emotions and higher self-esteem. Results indicate that adolescents experience mixed-sex settings positively, and that comfort with the other sex (for girls) and more time spent with the other sex (for boys) are predictive of more positive self-perceptions. Activity diary data suggest that these differences are due to differences in the emotional climate of same- and mixed-sex settings, rather than to the activities adolescents engage in with same- and mixed-sex groups. Dating boys who are less interested in dating experience lower self-esteem. Results are discussed in light of the transitional nature of mixed-sex relationships in early adolescence and the preparatory role played by same-sex friendships.  相似文献   
55.

Lasting peace across the Taiwan Strait cannot be reached before the leaders in Beijing and Taipei agree on the framework within which a political settlement can be discussed. This article examines one possible end goal for lasting peace in the Strait, a ‘Greater Chinese Union’. This model is founded on principles guiding the unique relationship between Finland and the Åland Islands as well as centuries old Chinese practices of governance. The article intentionally distances itself from the present, day-to-day antagonistic politics of the Taiwan Strait and instead describes the framework within which a peaceful settlement could be negotiated.

  相似文献   
56.
概述美国海事补充规则之规则B的适用条件,并对电子转账的保全、辅助国外仲裁/诉讼的保全、执行国外裁决或判决的保全及对保全的抗辩进行介绍,并分析规则B的最新发展。  相似文献   
57.
National Institute of Standards and Technology SRM 2372 human DNA quantitation standard has been produced to support the need for a human-specific DNA quantitation standard in forensic casework and calibration of new quantitative polymerase chain reaction (qPCR) assays. The conventional DNA concentration has been assigned with one of the U.S. National Reference UV/Visible Spectrophotometers, assuming an absorbance of 1.0 at 260 nm equals 50 ng/μL of double stranded DNA. In addition, an interlaboratory study has been conducted, to verify that the SRM 2372 materials perform well in currently used DNA quantitation assays by the forensic DNA community. Each unit of SRM 2372 consists of three well-characterized DNA extracts. Component A is a single-source human male material derived from blood. Component B is a multiple-source human female material derived from blood. Component C was purchased as a purified unsheared genomic human DNA (Sigma-Aldrich Co., St. Louis, MO) obtained as a lyophilized human genomic extract and has both male and female donors. SRM 2372 is intended to enable the comparison of DNA concentration measurements across time and place. Manufacturers can use SRM 2372 to validate the values assigned to their own reference materials. Individual forensic laboratories can use SRM 2372 to validate DNA quantitation methods and to verify the assigned concentration of in-house or commercial DNA calibration standards.  相似文献   
58.
Recent headlines comparing the health risks of nanotechnology to those of asbestos have appeared in newspapers throughout the country and on the Internet. Governmental agencies and standard-setting organizations have begun considering and actually adopting requirements to protect against such purported risks. The plaintiffs’ bar and potential plaintiffs have surely taken note. There is every reason to believe that the era of mass tort and class actions related to nanotechnology—“nanotorts” for short—is rapidly approaching. This article examines what nanotort claims might look like, the role that regulations and industry practices may play in such lawsuits, potential defenses to those claims, and what nanotech companies can do now to guard against future nanotort liabilities.  相似文献   
59.
Millar  Heather  Lesch  Matthew  White  Linda A. 《Policy Sciences》2019,52(1):97-118
Policy Sciences - This article proposes that closer attention to models of the individual provides substantial theoretical and empirical leverage to policy studies scholars. Capturing the nuances...  相似文献   
60.
This article is based on the results of a survey carried out in 2019 to document health managers and professionals’ knowledge concerning their linguistic obligations and the tools promoting active offer in the field of mental health in French, in Ontario and Manitoba. The working hypothesis is that knowledge of the obligations and available tools can contribute to a successful offer of services in French. The more professionals and managers understand their obligations, the more tools they can use to fulfill them. The study shows that there is indeed a link between knowledge of obligations and the use of tools to provide an active offer of mental health services in French. It also highlights the key role of tools to provide French services actively.  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