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   927篇
  免费   41篇
各国政治   51篇
工人农民   111篇
世界政治   59篇
外交国际关系   33篇
法律   486篇
中国政治   18篇
政治理论   204篇
综合类   6篇
  2023年   8篇
  2022年   9篇
  2021年   9篇
  2020年   24篇
  2019年   28篇
  2018年   48篇
  2017年   39篇
  2016年   45篇
  2015年   39篇
  2014年   41篇
  2013年   118篇
  2012年   28篇
  2011年   47篇
  2010年   30篇
  2009年   40篇
  2008年   36篇
  2007年   53篇
  2006年   40篇
  2005年   32篇
  2004年   31篇
  2003年   28篇
  2002年   31篇
  2001年   13篇
  2000年   13篇
  1999年   11篇
  1998年   9篇
  1997年   5篇
  1996年   6篇
  1995年   9篇
  1994年   11篇
  1993年   6篇
  1992年   10篇
  1991年   4篇
  1990年   6篇
  1988年   8篇
  1987年   8篇
  1986年   4篇
  1985年   8篇
  1984年   3篇
  1983年   4篇
  1982年   3篇
  1981年   3篇
  1980年   3篇
  1979年   3篇
  1978年   3篇
  1977年   2篇
  1974年   3篇
  1973年   2篇
  1972年   1篇
  1971年   1篇
排序方式: 共有968条查询结果,搜索用时 15 毫秒
281.
Boston's public schools have long drawn national attention in educational and political studies and more recently in legal accounts of desegregation. With the rise of remedial law, the maturation of public unions, and the improvement of constituencies—all forces flowering in the 1970s—the traditional concept of organizational rationality has been effectively undermined for professionals in the school system. Problem-solving skills and professional concepts relating to resource allocation and accountability are submerged by the inescapable need for coalition building, negotiation, and compromise. In the process, the critical roles are those of amateurs, neither committed to the organization or program, nor responsible for results.  相似文献   
282.
283.
284.
285.
286.
The police claimed that drug trafficking was going on at the needle exchange run by the Vancouver Area Network of Drug Users, but they failed to provide any evidence to that effect. The police later apologized for their remarks and the exchange re-opened.  相似文献   
287.
Sudden unexpected death in epilepsy: neuropathologic findings   总被引:4,自引:0,他引:4  
Sudden unexpected death in epilepsy refers to sudden death of an individual with a clinical history of epilepsy, in whom a postmortem examination fails to uncover a gross anatomic, toxicologic, or environmental cause of death. Evidence of terminal seizure activity may not be present. One to two percent of natural deaths certified by the medicolegal death investigator are attributed to epilepsy. Detailed microscopic examination of the brain has increasingly afforded the identification of structural changes representative of epileptogenic foci. The authors present 70 cases of death attributed to sudden unexpected death in epilepsy. These cases were classified as follows: individuals who lacked a gross brain lesion, those who had a brain lesion demonstrable at autopsy, and those who lacked neuropathologic evaluation because of decomposition or because only an external examination was done. All of the subjects had a clinical history of seizures. The authors confirm that various microscopic findings, including neuronal clusters, increased perivascular oligodendroglia, gliosis, cystic gliotic lesions, decreased myelin, cerebellar Bergmann's gliosis, and folial atrophy, are present in a higher percentage of the brains of sudden unexpected death in epilepsy subjects than in the brains of age- and sex-matched control subjects.  相似文献   
288.
The current study investigated the effects of an experimentally imposed program of preferential selection on beneficiary self-evaluations and newcomer information-seeking behavior. One hundred-twenty undergraduates were randomly assigned to a classification condition (in which they were informed that they tended to think in either an analytical or abstract manner) and collaborated on a task in groups of three. A fourth participant was introduced into each of these 40 extant groups under either a condition of preferential selection or not. Preferentially selected newcomers were shown to have more positive self-evaluations than their nonpreferentially selected counterparts. The presence or absence of a similar (in terms of thinking style) incumbent moderated the effect of being preferentially selected on the use of specific information-seeking behaviors.  相似文献   
289.
The purpose of these studies was to evaluate the performance characteristics of the Cozart Microplate Enzyme Immunoassay (EIA) for the determination of methadone in oral fluid from patients in a drug misuse treatment program. Oral fluid specimens were collected using the Cozart RapiScan Collection system from 198 donors who were receiving treatment for their addiction and were monitored for drug misuse. Oral fluid specimens were also collected from forty volunteer donors who were not drug users. The specimens were analyzed in the laboratory by EIA and then analysed for methadone and its main metabolite EDDP by gas chromatography-mass spectrometry (GC-MS). A total of 103 samples were confirmed positive for methadone. The Cozart Microplate EIA for d-Methadone in oral fluid using a cutoff of 30 ng/mL in diluted oral fluid had a sensitivity of 91.3% +/- 2.8% and a specificity of 100% +/- 1.0% vs. GC-MS.  相似文献   
290.
Oxycodone is a potent semi-synthetic narcotic prescribed for the management of pain. Previous investigators have reported that the abuse of oxycodone is most frequently seen in conjunction with the abuse of other drugs, although fatalities have been reported with oxycodone alone. We undertook a retrospective review of cases investigated by the Palm Beach County Medical Examiner's Office in which postmortem toxicologic studies indicated the presence of oxycodone. A total of 172 consecutive cases were studied, including 18 in which death was attributed to oxycodone toxicity, 117 to combined drug toxicity, 23 to trauma, 9 to natural causes and 5 to another drug or drugs. The postmortem blood concentrations of oxycodone overlapped among the groups. The mean blood oxycodone concentration among the cases of oxycodone toxicity was 0.69 mg/L, combined drug toxicity 0.72 mg/L and trauma 0.62 mg/L. Concentrations were lower in cases of deaths attributed to natural causes and to another drug or drugs (mean each 0.087 mg/L). Benzodiazepines, detected in 96 cases, were the most common co-intoxicants in the cases of combined drug toxicity, followed by cocaine, which was found in 41. The most frequently encountered benzodiazepine was alprazolam. This study confirms that deaths in which oxycodone is a factor are most commonly cases of combined drug toxicity. The high incidence of alprazolam as a co-intoxicant has not been previously recognized.  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