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   175篇
  免费   12篇
各国政治   8篇
工人农民   20篇
世界政治   10篇
外交国际关系   18篇
法律   95篇
中国政治   1篇
政治理论   35篇
  2023年   2篇
  2022年   3篇
  2021年   1篇
  2020年   5篇
  2019年   10篇
  2018年   8篇
  2017年   10篇
  2016年   8篇
  2015年   7篇
  2014年   10篇
  2013年   26篇
  2012年   8篇
  2011年   11篇
  2010年   13篇
  2009年   2篇
  2008年   8篇
  2007年   9篇
  2006年   5篇
  2005年   8篇
  2004年   6篇
  2003年   11篇
  2002年   6篇
  2001年   1篇
  2000年   1篇
  1998年   1篇
  1997年   1篇
  1996年   1篇
  1994年   2篇
  1991年   1篇
  1986年   1篇
  1978年   1篇
排序方式: 共有187条查询结果,搜索用时 15 毫秒
1.
A traditional view of scholarly quality defines rigor as the application of method and assumes an implicit connection with relevance. But as an applied field, public administration requires explicit attention to both rigor and relevance. Interpretive scholars' notions of rigor demand an explicit inclusion of relevance as an integral aspect of quality. As one form of interpretive research, narrative inquiry illuminates how this can be done. Appreciating this contribution requires a deeper knowledge of the logic of narrative inquiry, an acknowledgement of the diversity of narrative approaches, and attention to the implications for judging its quality. We use our story about community-based leadership research to develop and illustrate this argument.  相似文献   
2.
3.
4.
5.
6.
Most research on self-handicapping has focused on adults. Only a few studies have examined self-handicapping in adolescents or the particular characteristics of the family environment that are associated with self-handicapping. Adolescents (N = 141) and their mothers completed a series of questionnaires assessing adolescent self-handicapping, adolescent dysphoria, and parenting variables in mothers, including parenting styles (care and overprotection) and parenting stress due to situational variables, parent–child dysfunctional interactions, and behavioral characteristics of the child. Results showed (a) that self-handicapping was positively related to age in girls, but not in boys, (b) that there was a strong relation between self-handicapping and dysphoria in both boys and girls, (c) that mother-rated care negatively predicted self-handicapping in girls beyond the effects due to girls' dysphoria, and (d) that maternal care moderated the relationship between self-handicapping and dysphoria in boys. Maternal care and depressive affect in young persons are independently related to self-handicapping behaviors in adolescents. Results are discussed in terms of implications for the hypothesized etiology of self-handicapping.  相似文献   
7.
A clear positive case for anabolic steroids doping was confounded by alleged urine tampering during doping control procedures. Review of the chain of custody showed no flaws, but nevertheless the athlete was adamant that the urine sample should be analyzed for DNA in order to support her contention that she was not the donor of the sample. The results obtained showed that the urine sample that scored positive for steroids contained nuclear DNA that could not be matched to the DNA obtained from the athlete's blood. On the other hand, the same urine sample contained mitochondrial DNA whose nucleotide sequences spanning the hyper variable regions HV1 and HV2 proved to be identical to those determined in mitochondrial DNA amplified from the athlete's blood. The occurrence of an extraneous genotype is compatible with exogenous nuclear DNA admixture to the athlete's urine. Alternatively, taking in consideration the mitochondrial DNA, we could not exclude that a sibling or a maternal relative of the athlete could have acted as a donor of the urine utilized for doping control and DNA analysis. Both situations point to possible tampering of the urine by the athlete. Adjudication at CAS maintained previous national and international federation decision that there was no proof of a chain of custody flaw to justify the athlete's allegation of urine substitution after collection.  相似文献   
8.
9.
10.
Low concentrations of THC and 11-hydroxy-THC in serum samples are often claimed not to result from recent cannabis use. Prediction of time of exposure is difficult, especially if distinctive features of drug use could not be observed. Therefore, the aim of the study was to investigate the presence of THC and 11-hydroxy-THC in serum samples as well as to obtain preliminary data on the analyte profile for a time window of 24-48 hours after discontinuation of cannabis smoking. Serum samples from heavy (n = 12, > 1 joint/day), moderate (n = 11, < or = 1 joint/day) and light (n = 6, < 1 joint/week) smokers of cannabis were analyzed for THC, 11-hydroxy-THC and free THC-COOH by GC/MS as well as for glucuronidated THC-COOH by LC/MS-MS. The blood samples were collected 24-48 hours after abstaining from cannabis use. Additionally, 8 specimens were obtained from persons after discontinuation of the drug for more than 48 hours. During collection of the blood samples, distinctive effects due to drug use could not be observed. For heavy users of cannabis, THC was detectable in 8 samples, and in 5 cases both biologically active compounds, THC and 11-hydroxy-THC, were present (1.3-6.4 ng THC/mL serum, 0.5-2.4 ng 11-hydroxy-THC/mL serum). Among moderate users, in 1 sample 1.8 ng THC/mL serum and 1.3 ng 11-hydroxy-THC/mL serum were determined, and another sample was tested positive with low concentrations close to the limit of detection. In serum samples of light users both analytes could not be detected, indicating that in those persons a positive finding of THC and 11-hydroxy-THC may rather result from recent consumption than from cannabis use 1 or 2 days prior to blood sampling. The concentrations of THC-COOH and its glucuronide covered a wide range in all groups of cannabis users. However, there was a trend to higher concentrations in heavy users compared to moderate users, and the mean concentration was smaller in light smokers than in moderate smokers. Overall, the findings indicated that data from pharmacokinetic studies should be supplemented by data obtained from "real-life" samples.  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