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   92篇
  免费   4篇
各国政治   6篇
工人农民   18篇
世界政治   7篇
外交国际关系   3篇
法律   44篇
中国政治   2篇
政治理论   16篇
  2024年   2篇
  2023年   1篇
  2022年   1篇
  2021年   4篇
  2020年   2篇
  2019年   1篇
  2018年   4篇
  2017年   1篇
  2016年   3篇
  2015年   3篇
  2014年   9篇
  2013年   9篇
  2012年   4篇
  2011年   4篇
  2010年   6篇
  2009年   7篇
  2008年   4篇
  2007年   4篇
  2006年   2篇
  2005年   5篇
  2003年   2篇
  2002年   3篇
  2001年   1篇
  1999年   1篇
  1996年   2篇
  1995年   1篇
  1991年   2篇
  1990年   2篇
  1987年   1篇
  1986年   1篇
  1984年   1篇
  1982年   1篇
  1981年   1篇
  1974年   1篇
排序方式: 共有96条查询结果,搜索用时 15 毫秒
61.
Our study examines the prior offending of 750 individuals who are known to be responsible for the abduction of a child under the age of 18 years. The first group comprised of 311 offenders (42%) who had abducted a child that was later located alive (found alive, referred to as FA). The second group was comprised of 439 offenders (58%) who had abducted a child that was either found murdered or was still missing and presumed dead (found murdered, referred to as FM). While males perpetrated the majority of the abductions, women perpetrated 31 (10%) of the offenses in the FA group and 10 (2%) of the offenses in the FM group. The average number of prior offenses as reflected in the NCIC criminal history of each offender was seven with these occurring over an average of 12 years. Seventy-five percent of the offenders had prior arrests for an assortment of different crimes while 25% had no known criminal history, a finding that was consistent across both the FA and FM groups. Of those with a criminal history, 41% had been arrested for assault, 40% for larceny, 35% for burglary/breaking and entering, 33% for forcible sex offenses, 25% for drug/narcotic offenses, 21% for weapons law violations, 17% for motor vehicle thefts, 15% for robbery, and 14% for kidnapping. Our findings are congruent with the theme of criminal diversity among child abductors and argue against the specificity in offending that is often assumed with this type of sexual offender. This information is relevant to our understanding of the progression in criminal offending that is manifested by offenders who abduct children and will hopefully be used by law enforcement in helping to direct and focus their investigations.  相似文献   
62.
This study focused on gas chromatographic analysis of target compounds found in illicit amphetamine synthesised by the Leuckart reaction, reductive amination of benzyl methyl ketone, and the nitrostyrene route. The analytical method was investigated and optimised with respect to introduction of amphetamine samples into the gas chromatograph and separation and detection of the target substances. Sample introduction using split and splitless injection was tested at different injector temperatures, and their ability to transfer the target compounds to the GC column was evaluated using cold on column injection as a reference. Taking the results from both techniques into consideration a temperature of 250 degrees C was considered to be the best compromise. The most efficient separation was achieved with a DB-35MS capillary column (35% diphenyl 65% dimethyl silicone; 30 m x 0.25 mm, d(f) 0.25 microm) and an oven temperature program that started at 90 degrees C (1 min) and was increased by 8 degrees C/min to 300 degrees C (10 min). Reproducibility, repeatability, linearity, and limits of determination for the flame ionisation detector (FID), nitrogen phosphorous detector (NPD), and mass spectrometry (MS) in scan mode and selected ion monitoring (SIM) mode were evaluated. In addition, selectivity was studied applying FID and MS in both scan and SIM mode. It was found that reproducibility, repeatability, and limits of determination were similar for FID, NPD, and MS in scan mode. Moreover, the linearity was better when applying FID or NPD whereas the selectivity was better when utilising the MS. Finally, the introduction of target compounds to the GC column when applying injection volumes of 0.2 microl, 1 microl, 2 microl, and 4 microl with splitless injection respectively 1 microl with split injection (split ratio, 1:40) were compared. It was demonstrated that splitless injections of 1 microl, 2 microl, and 4 microl could be employed in the developed method, while split injection and splitless injections of 0.2 microl should be avoided.  相似文献   
63.
Anabolic Androgenic Steroids (AAS) are considered drugs of abuse and are controlled substances in Sweden since 1999. Traditionally AAS have been used by elite athletes to enhance performance, but in recent years it has become an increasing problem outside elite sport among athletes, bodybuilders and criminals. Use of AAS is associated with psychiatric side effects such as aggression, depression and violent behavior. Supraphysiological doses and long term use can cause serious physical harm such as cardiovascular toxicity and even premature death. We investigated and evaluated the drug analytical findings in forensic cases from suspected perpetrators in cases from the police where a screening for AAS was requested to get information about the prevalence of AAS use and the occurrence of poly-drug abuse. The study was based on samples submitted from the police authorities to the Department of Forensic Toxicology in Sweden during the period 1999-2009. Urines were analyzed by methods based on GC-MS and LC-MS-MS. We also analyzed the prevalence of AAS use at the prison and probation services. A total number of 12,141 urine samples (6362 police cases and 5779 inmates) were analyzed and 33.5% of the cases from the police and 11.5% of the inmates were tested positive for AAS. The users of AAS were mainly in 99.2% men with a mean age of 26.2±6.2 years whereas the women were 29.5±6.5 years old. The most frequently used AAS was nandrolone followed by testosterone and methandienone. Other illicit and licit drugs were detected in 60% of the cases from the police, strongly indicating a frequent poly-drug abuse among users of AAS.  相似文献   
64.
This paper empirically uses a street-level bureaucrat (SLB) lens to compare the impact of personal and organisational support on the innovative behaviour of frontline healthcare workers in Australia and the United States. Survey data came from the 260 U.S. and 220 Australian respondents. The structural equation model shows that organisational (i.e. manager–subordinate relationships) and personal supports (i.e. psychological capital [PsyCap]) significantly influence the innovative behaviour of frontline SLBs in health care. Further, the mediation results show that reciprocal social exchanges provide the foundations for facilitating the growth of healthcare workers’ PsyCap, which then gives them the resilience to be innovative in the workplace. The U.S. respondents perceived stronger organisational support and consequently had a better platform for building PsyCap – providing better work conditions for facilitating innovative behaviour to bourgeon. The paper adds to SLB theory concerning the influence of two variables on SLBs' innovative behaviour, in addition to a meaningful comparison of the U.S. and Australian healthcare workers. If governments and organisations want innovative workers, then the policies must be based on empirical evidence that shows the impact on all stakeholders, including SLBs, because otherwise, irrespective of policy directives, the outcome is low levels of employee wellbeing (which likely results in limited innovative activity).  相似文献   
65.
66.

Teacher attitudes and instructional strategies impact success of human sexuality programs. Limited prior research has examined the relations of teachers’ attitudes and instruction to the development of adolescents’ sexual self-efficacy beliefs. This study examined how adolescents’ perceptions of their health teachers (i.e., teacher value of content, teacher affinity, teacher caring for students) predict changes in efficacy beliefs related to HIV/STD and pregnancy prevention, and if perceptions of mastery goal structure predicted adaptive efficacy beliefs. Data were collected in 4 Midwestern/Appalachian high schools in health class where the delivery of a 14-lesson sexual health curriculum occurred. Participants included 561 students (50.4% 9th graders, 43.5% female, 56.3% White, 53.7% did not have a current romantic partner, and 59.7% had previously not engaged in sexual activity). The findings indicate students’ perceptions of teachers valuing the content predicted perceptions of mastery goal structure for all sexual self-efficacy beliefs: learning efficacy, condom negotiation efficacy, refusal self-efficacy, and situational self-efficacy. Students who perceive a mastery goal structure in health class, and who feel their teachers value learning about HIV/STD and pregnancy prevention, are likely to experience positive adaptive self-efficacy beliefs related to sexual health, ultimately leading to behaviors indicative of decreased STDs among teenagers and safe sexual practices, such as abstinence, the use of a condom, and saying “no” to having sex.

  相似文献   
67.
Journal of Experimental Criminology - To examine the effectiveness of social skills training (SST) for juvenile offenders and for whom and under which conditions SSTs are the most effective....  相似文献   
68.
69.
70.
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