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   742篇
  免费   51篇
各国政治   63篇
工人农民   31篇
世界政治   46篇
外交国际关系   63篇
法律   352篇
中国政治   13篇
政治理论   220篇
综合类   5篇
  2023年   7篇
  2022年   3篇
  2021年   9篇
  2020年   16篇
  2019年   25篇
  2018年   28篇
  2017年   39篇
  2016年   29篇
  2015年   32篇
  2014年   25篇
  2013年   128篇
  2012年   29篇
  2011年   26篇
  2010年   28篇
  2009年   23篇
  2008年   22篇
  2007年   18篇
  2006年   26篇
  2005年   12篇
  2004年   24篇
  2003年   15篇
  2002年   19篇
  2001年   10篇
  2000年   15篇
  1999年   11篇
  1998年   10篇
  1997年   11篇
  1996年   10篇
  1995年   5篇
  1994年   11篇
  1993年   12篇
  1992年   14篇
  1991年   12篇
  1990年   11篇
  1989年   9篇
  1988年   4篇
  1987年   8篇
  1986年   6篇
  1985年   5篇
  1984年   3篇
  1982年   3篇
  1981年   7篇
  1980年   3篇
  1979年   3篇
  1978年   6篇
  1977年   6篇
  1976年   3篇
  1975年   3篇
  1973年   2篇
  1972年   2篇
排序方式: 共有793条查询结果,搜索用时 0 毫秒
111.
112.
Respiratory pathogens have been detected in forensic investigations using multiple techniques; however, no study has examined the use of automated, nested, multiplex polymerase chain reaction (ANM‐PCR), commonly used in living patients, in the forensic setting. This retrospective study assessed the utility of ANM‐PCR in detecting respiratory pathogens in the pediatric forensic setting. Respiratory samples from 35 cases were tested for up to 20 respiratory pathogens. 51.4% of these cases yielded a positive ANM‐PCR result, 20% of which were considered the cause of or contributory to death. The most commonly detected pathogens were rhinovirus/enterovirus and respiratory syncytial virus, and these were the only pathogens determined to play a significant role in cause of death. The sampled sites and postmortem intervals tested did not affect the likelihood of a positive or negative test. ANM‐PCR panels are effective, affordable, and rapid ancillary tools in evaluating cause of death in the forensic pediatric population.  相似文献   
113.
Understanding how sexual offenders experience prison and its environment is important because such experiences can impact on rehabilitation outcomes. The purpose of this research investigation was to explore the rehabilitative and therapeutic climate of a recently re-rolled sexual offender prison. The research took a mixed methods approach and consisted of quantitative and qualitative phases. There were differences between prisoners and staff on their perception of the prison climate and for prisoner and staff relationships. The qualitative results helped to explain the quantitative findings and added a more nuanced understanding of the experience of the prison, the nature of prisoner and staff relationships and the opportunities for personal growth within the prison. The study has important implications for prisons that co-locate sexual offenders and want to provide an environment conducive to rehabilitation.  相似文献   
114.
115.
This study examined the longitudinal association between contextual stress and health risk behaviors and the role of protective factors in a community epidemiologically-defined sample of urban African American adolescents (N = 500; 46.4% female). Structural equation modeling was used to create a latent variable measuring contextual stress (community violence, neighborhood disorder, and experiences with racial discrimination). Contextual stress in 8th grade was associated with aggressive behavior and substance use 2 years later for boys. For girls, contextual stress predicted later substance use, but not aggressive behavior. High academic competence and self-worth reduced the impact of contextual stress on substance use for boys. Implications for intervention and directions for future research on health risk behaviors among African American adolescents are discussed.  相似文献   
116.
The validity and feasibility of using DNA collection cards in the field for preservation and analysis of Cannabis sativa genotypes were investigated using a highly specific hexanucleotide marker. Collection cards were submitted to the National Marijuana Initiative, which selectively trained and managed the collection of specific types of samples from a variety of participating agencies. Samples collected at seizure sites included fresh marijuana leaf samples, dried "dispensary" samples, U.S. border seizures, and hashish. Using a standardized PCR kit with custom-labeled oligonucleotide primers specific to marijuana, collection cards produced eight genotypes and 13 different alleles, extremely low baselines, and no cross-reactivity with control plant species. Results were produced from all sample types with the exception of hashish. Plant DNA collection cards represent an easily implementable method for the genetic identification and relatedness of C. sativa street and grow site-seized samples with applications for databasing and market disruption.  相似文献   
117.
118.
119.
Although supervising persons with mental illness can pose special challenges for community parole/probation officers (PPOs), few studies have investigated whether the number of supervisees on an officer’s caseload increases risk for poor mental health for PPOs and whether this link is due to emotional exhaustion. Using statewide survey data from 798 PPOs, we examine whether the number of supervisees on an officer’s caseload with mental health problems is associated with depressive symptoms reported the PPOs and whether this relationship is mediated by emotional exhaustion. In addition, we evaluate the potential mitigating role of both mental health services received by supervisees and officer training in mental health in the relationship between the number of supervisees on an officer’s caseload with mental health problems and emotional exhaustion experienced by PPOs. Findings reveal that PPOs with more supervisees on their caseload report significantly higher levels of depressive symptoms and that this relationship is completely explained away by emotional exhaustion. Neither mental health services received by supervisees nor officer training in mental health mitigated the link between the number of supervisees on an officer’s caseload with mental health problems and officer emotional exhaustion. This study underscores the importance of the psychological well-being of those on parole/probation for the emotional and mental health of the officers who supervise them.  相似文献   
120.
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