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   115篇
  免费   3篇
各国政治   5篇
工人农民   14篇
世界政治   1篇
外交国际关系   2篇
法律   81篇
中国政治   3篇
政治理论   12篇
  2022年   2篇
  2020年   3篇
  2019年   3篇
  2018年   3篇
  2017年   4篇
  2016年   2篇
  2015年   3篇
  2014年   3篇
  2013年   13篇
  2012年   7篇
  2011年   5篇
  2010年   6篇
  2009年   8篇
  2008年   3篇
  2007年   9篇
  2006年   4篇
  2005年   3篇
  2004年   3篇
  2003年   1篇
  2002年   3篇
  2001年   3篇
  2000年   5篇
  1999年   5篇
  1998年   3篇
  1997年   1篇
  1995年   2篇
  1992年   1篇
  1991年   1篇
  1990年   2篇
  1985年   4篇
  1982年   1篇
  1976年   1篇
  1964年   1篇
排序方式: 共有118条查询结果,搜索用时 15 毫秒
1.
2.
3.
Experiences with racism are a common occurrence for African American youth and may result in negative self perceptions relevant for the experience of depressive symptoms. This study examined the longitudinal association between perceptions of racism and depressive symptoms, and whether perceived academic or social control mediated this association, in a community epidemiologically-defined sample of urban African American adolescents (N = 500; 46.4% female). Structural equation modeling revealed that experiences with racism were associated with low perceived academic control, which in turn was associated with increased depressive symptoms. Findings suggest that experiences with racism can have long lasting effects for African American youth’s depressive symptoms, and highlight the detrimental effects of experiences with racism for perceptions of control in the academic domain. Implications for intervention are discussed.
Sharon F. LambertEmail:
  相似文献   
4.
5.
Hair samples of eight postmortem cases were analyzed in segments of 1 to 3 cm for cocaine, benzoylecgonine and cocaethylene. Samples were prepared for analysis by digestion in 0.1 M HCl and subsequent extraction with mixed-mode solid-phase extraction columns. Measurement was made by reversed-phase, narrow-bore HPLC and fluorescence detection using two laboratory-made internal standards. The concentrations were in the region of 0.29-316 ng/mg of hair for cocaine, 0.43-141 ng/mg of hair for benzoylecgonine and 0.93-1.83 ng/mg of hair for cocaethylene. All eight investigated cases had cocaine-positive segments. In six of the cases, all segments were positive, suggesting regular cocaine use and two showed in-between negative segments indicating an interruption or a change of the abuse intensity. The results showed a second, remarkable observation, i.e. enormous concentration differences (factor >150) for both cocaine and benzoylecgonine between the different subjects. Furthermore, interindividual cocaine/benzoylecgonine ratios ranged from 0.02 to 8.43. We believe these observations could in part be attributed to both some of the still existing limitations in the analytical approach(es), especially the mandatory hair washing steps, and in our still too limited knowledge of the hair incorporation processes. Nevertheless, in some cases, segmental analysis proved to be an important tool to distinguish, together with postmortem examination, deadly chronic abuse from single acute drug overdosage.  相似文献   
6.
7.
The amphetamine derivative 3,4-methylenedioxymethamphetamine (MDMA, "Ecstasy" is a currently used or abused designer drug and fatalities are frequently encountered in forensic practice. However, the question remains open whether an MDMA blood level can be toxic or even potentially lethal. In order to provide insight in the interpretation of a detected MDMA concentration, the distribution of MDMA and its metabolite 3,4-methylenedioxyamphetamine (MDA) in various body fluids and tissues was studied and discussed in two different fatalities. Apart from peripheral blood samples (such as femoral and subclavian blood), various blood samples obtained centrally in the human body and several body fluids (such as vitreous humour) were examined. In addition, various tissues such as cardiac muscle, lungs, liver, kidneys, and brain lobes were analysed. In contrast to the peripheral blood levels, high MDMA and MDA levels were found in cardiac blood and the majority of the organs, except for the abdominal adipose tissue. The high concentrations observed in all lung lobes, the liver and stomach contents indicate that post-mortem redistribution of MDMA and MDA into cardiac blood can occur and, as a result, blood sampled centrally in the body should be avoided. Therefore, our data confirm that peripheral blood sampling remains "the golden standard". In addition, a distinct difference in peripheral blood MDMA concentrations in our two overdose cases was established (namely 0.271 and 13.508 microg/ml, respectively). Furthermore, our results suggest that, if a peripheral blood sample is not available and when putrefaction is not too pronounced, vitreous humour and iliopsoas muscle can be valuable specimens for toxicological analysis. Finally, referring to the various mechanisms of death following amphetamine intake, which can result in different survival times (e.g. cardiopulmonary complications versus hyperthermia), the anatomo-pathological findings and the toxicological results should be considered as a whole in arriving at a conclusion.  相似文献   
8.
Criminal justice professionals are a potential source of students for many criminal justice programs, especially those in metropolitan areas. This study explored factors that influenced the higher education decisions of 480 Northwestern Ohio criminal justice employees (e.g., municipal police officers, sheriff deputies, jail staff, and prison staff). Most indicated a desire to pursue higher education. Among those indicating an interest in earning a degree, cost and convenience were the most significant factors in their choice. The availability of evening and weekend classes, availability of a part-time curriculum, availability of financial aid/tuition reimbursement, total credit hours required for the degree, the field experience of faculty, and flexibility in admission requirements were all significant factors. Location was also very significant. Most respondents indicated that they would not travel more than thirty minutes to attend classes.  相似文献   
9.
10.
The paper highlights the paradoxical position of certain Salafi and Islamist communities in London who have consistently demonstrated skill, courage and commitment in countering al-Qaida propaganda and recruitment activity while simultaneously facing ill-founded criticism from other Muslim communities and secular political lobbyists for creating the conditions that gave rise to the al-Qaida phenomena. In doing so the paper compares the experience of Salafi and Islamist communities living in London during an ongoing terrorist campaign by al-Qaida with Jewish and Irish Catholic communities living in London during earlier terrorist campaigns against the UK’s capital city. In each instance community policing is shown to have a crucial role to play in terms of reassurance for minority faith communities and the prevention of terrorism. However, the intersection between policing and counter-terrorism is shown to produce tensions that may weaken minority community confidence in policing and thereby reduce proactive community support for counter-terrorism measures. At this intersection a London policing initiative is shown to have developed proactive counter-terrorism partnerships with Salafi and Islamist community groups of a pioneering nature. In consequence the same critics who conflate Salafis and Islamists with an urgent terrorist threat to London have accused this policing initiative of appeasing extremism.  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