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   625篇
  免费   32篇
各国政治   32篇
工人农民   15篇
世界政治   26篇
外交国际关系   40篇
法律   307篇
中国政治   17篇
政治理论   213篇
综合类   7篇
  2023年   5篇
  2022年   5篇
  2021年   4篇
  2020年   15篇
  2019年   15篇
  2018年   22篇
  2017年   35篇
  2016年   23篇
  2015年   11篇
  2014年   14篇
  2013年   98篇
  2012年   14篇
  2011年   17篇
  2010年   21篇
  2009年   19篇
  2008年   14篇
  2007年   23篇
  2006年   23篇
  2005年   16篇
  2004年   16篇
  2003年   15篇
  2002年   14篇
  2001年   11篇
  2000年   14篇
  1999年   14篇
  1998年   11篇
  1997年   11篇
  1996年   9篇
  1995年   8篇
  1994年   9篇
  1993年   11篇
  1992年   12篇
  1991年   6篇
  1990年   8篇
  1989年   2篇
  1988年   6篇
  1987年   6篇
  1986年   11篇
  1985年   5篇
  1984年   3篇
  1983年   7篇
  1982年   5篇
  1981年   4篇
  1980年   5篇
  1979年   16篇
  1977年   3篇
  1976年   5篇
  1972年   6篇
  1967年   4篇
  1966年   1篇
排序方式: 共有657条查询结果,搜索用时 15 毫秒
651.
652.
The recent release of the DSM-5 comes with the division of posttraumatic stress disorder (PTSD) symptoms across four symptom clusters (American Psychiatric Association, 2013). This division is based on the support garnered by two four-factor models; Emotional Numbing (King et al., 1998) and Dysphoria (Simms et al., 2002) and a five-factor model; Dysphoric Arousal (Elhai et al., 2011). Much debate centered on the validity of the Dysphoria factor as a non-specific factor of PTSD within the Dysphoria model. In line with this, we assessed relations between the four factors of the Dysphoria model (Simms et al., 2002) and positive (PA) and negative affect (NA) in natural disaster victims (N?=?200) from Leh, India, using the PTSD checklist (PCL-S) and Positive and Negative Affect Schedule (PANAS short form). Confirmatory factor analysis was implemented to assess the best-fitting model for both the PCL (PTSD) and the PANAS (affect). Two optimal models (the Dysphoria model and a two-factor model for affect) were subsequently used to assess latent variable associations across constructs. It was hypothesized that differential associations between latent factors would be evident with the Dysphoria factor being highly correlated with negative affect compared to alternative PTSD factors. Significant correlations were found between factors of the Dysphoria model and NA (0.52–0.65, p?<?0.001). Comparing the association of pairs of PTSD factors with NA and PA, Wald’s tests revealed that no single PTSD factor was more related to NA than the other. Avoidance and Hyperarousal factors were correlated with PA. Results are discussed in line with literature questioning Dysphoria factor’s unique association with general distress.  相似文献   
653.
This article compares laws and policies in Italy and the US regarding children's right to be heard and to engage in the life of the community. Italy has adopted a strong children's rights perspective, informed by the principles of the Convention on the Rights of the Child (CRC). The US, with its pre-modern constitution and resistance to international law, has been slow to recognise children's rights to voice and agency. The US Supreme Court has extended some due process rights to children in criminal court proceedings, but the US lags far behind Italy in recognition of children's rights to participate in civic life and collective decision-making. Child well-being rankings may reflect these differences in attitudes towards children's rights. Italy ranks significantly higher than the US on objective measures of child well-being and Italian children report superior peer and family relationships.  相似文献   
654.
In late February 2008, law enforcement officials in Las Vegas, Nevada, discovered in a hotel room, a copy of The Anarchist Cookbook, suspected castor beans and a "white powder" thought to be a preparation of ricin. Ricin is a deadly toxin from the seed of the castor bean plant (Ricinus communis). The United States regulates the possession, use, and transfer of ricin and it is the only substance considered a warfare agent in both the Chemical and the Biological Weapons Conventions. Six samples obtained from the hotel room were analyzed by laboratories at the Centers for Disease Control and Prevention using a panel of biological and mass spectrometric assays. The biological assays (real time-PCR, time resolved fluorescence and cytotoxicity) provided presumptive evidence of active ricin in each of the samples. This initial screen was followed by an in-depth analysis using a novel, state-of-the-art mass spectrometry-based ricin functional assay and high sensitivity tandem mass spectrometry for protein identification. Mass spectrometric analysis positively identified ricin and confirmed that in each of the samples it was enzymatically active. The tandem mass spectrometry analysis used here is the most selective method available to detect ricin toxin. In each sample, ricin was unequivocally identified along with other R. communis plant proteins, including the highly homologous protein RCA120. Although database searches using tandem mass spectra acquired from the samples indicated that additional controlled substances were not present in these samples, the mass spectrometric results did provide extensive detail about the sample contents. To the best of our knowledge following a review of the available literature, this report describes the most detailed analysis of a white powder for a public health or forensic investigation involving ricin.  相似文献   
655.
In recent years, alcohol consumption has been considered an important public health problem. Ethanol, the alcohol used in beverages, is a drug that affects the central nervous system (CNS) and impairs driving skills and co-ordination, increasing risk of deaths and injuries derived from crashes and road accidents. Consumption of alcoholic beverages is implicated with premature deaths, injuries and damages caused by motor vehicle crashes, which result in high costs to government and society. Considering that alcohol consumption is the main responsible factor for deaths and disabilities in young people, the aim of this work was to evaluate the prevalence of blood alcohol in offenders and/or fatal and non-fatal victims of traffic occurrences in the region of Ribeir?o Preto, S?o Paulo State, from 2005 to 2007. The results revealed that in 2134 cases investigated, blood alcohol positivity was generally found in young adults, 25-45 years old and male. The study showed the high risk of drinking and driving and the importance in establishing actions of prevention and intervention to promote the reduction in the number of traffic occurrences related to consumption of alcoholic beverages.  相似文献   
656.
Master's degree enrollment and debt have increased substantially in recent years, raising important questions about the labor market value of these credentials. Using a field experiment featuring 9,480 job applications submitted during the early months of the COVID-19 pandemic, I examine employers’ responses to job candidates with a Master of Business Administration (MBA), which represents one-quarter of all master's degrees in the United States. I focus on MBAs from three types of less-selective institutions that collectively enroll the vast majority of master's students: for-profit, online, and regional universities. Despite the substantial time and expense required for these degrees, job candidates with MBAs from all three types of institutions received positive responses from employers at the same rate as candidates who only had a bachelor's degree—even for positions that listed a preference for a master's degree. Additionally, applicants with names suggesting they were Black men received 30 percent fewer positive responses than otherwise equivalent applicants whose names suggested they were White men or women, providing further evidence of racial discrimination in hiring practices.  相似文献   
657.
The likelihood that longevity will continue to increase has generated a search for regulation that make people work longer as they live longer, and thus not just containing pension expenditure but also enlarging labor supply, economic growth, and tax revenue. In public pension policy, Nordic countries have led the world with three types of approaches aimed at making people retire later. The first came when Sweden, followed by Finland and Norway, installed life expectancy coefficients in benefit calculation formulas. The second followed as Finland introduced age-related accrual rates and the third when Denmark indexed the pensionable age to developments in life expectancy. Since economic incentive-based regulations failed to raise exit ages sufficiently, Finland and Sweden subsequently linked pensionable ages to life expectancy like Denmark. While this policy brings out inequalities in health and workability, the fact that countries found it necessary to index the pensionable age to longevity instead of just relying on economic incentives in regulating retirement behavior may hold lessons for other countries.  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