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   812篇
  免费   39篇
各国政治   51篇
工人农民   134篇
世界政治   59篇
外交国际关系   37篇
法律   398篇
中国政治   8篇
政治理论   160篇
综合类   4篇
  2023年   4篇
  2022年   9篇
  2021年   16篇
  2020年   29篇
  2019年   40篇
  2018年   48篇
  2017年   52篇
  2016年   53篇
  2015年   26篇
  2014年   31篇
  2013年   145篇
  2012年   40篇
  2011年   35篇
  2010年   18篇
  2009年   28篇
  2008年   32篇
  2007年   35篇
  2006年   17篇
  2005年   27篇
  2004年   17篇
  2003年   21篇
  2002年   31篇
  2001年   11篇
  2000年   8篇
  1999年   9篇
  1998年   5篇
  1997年   5篇
  1996年   9篇
  1995年   10篇
  1994年   2篇
  1993年   7篇
  1992年   6篇
  1991年   1篇
  1990年   4篇
  1989年   1篇
  1988年   4篇
  1987年   2篇
  1986年   4篇
  1985年   2篇
  1984年   1篇
  1982年   2篇
  1981年   1篇
  1979年   1篇
  1978年   1篇
  1977年   1篇
排序方式: 共有851条查询结果,搜索用时 15 毫秒
801.
Laura Nielsen 《Law & policy》1999,21(3):247-282
This article explores one multinational corporation's employee termination practices in the United States and Canada. There are fairly insignificant differences in employees' legal protections in the two countries and the company claims a uniform corporate employee termination process cross‐nationally. However, there are major structural and procedural differences in the employee termination process. The differences, including the way attorneys are utilized, the use of quasi‐legal personnel to comply with regulatory requirements, and the substance of the severance package are explored. In the United States money is directed toward legal professionals –"paying lawyers" while in Canada expenses associated with employee termination go to severance packages –"paying workers."  相似文献   
802.
803.
804.
One of the tasks of the European project entitled “Collaborative Harmonisation of Methods for Profiling of Amphetamine Type Stimulants” (CHAMP) funded by the sixth framework programme of the European Commission was to develop a harmonised methodology for MDMA profiling and the creation of a common database in a drug intelligence perspective. Part I was dedicated to the analysis of organic impurities formed during synthesis in order to investigate traffic tendencies and highlight potential links between samples, whereas this part focuses on physical characteristics of the MDMA tablets. Diameter, thickness, weight and score were demonstrated to be reliable and relevant features in this drug intelligence perspective. Distributions of samples coming from the same post-tabletting batch (post-TB) and samples coming from different post-TB were very well discriminated by using the squared Euclidean or the Manhattan distance on standardised data. Our findings demonstrated the possibility to discriminate between MDMA samples issued from different post-TB and to find out links between samples coming from a same post-TB. Furthermore, the hypothesis that most of the MDMA samples found on the international market come from the same countries was supported.  相似文献   
805.
Seven ethyl homologues of known tropane esters have recently been detected as impurities in the gas chromatographic signature profiles of authentic Peruvian illicit cocaine base and hydrochloride exhibits. Peruvian cocaine base processors are now known to use ethanol for the purification of crude cocaine base. This process is referred to as the "base lavada" or "washed base" process and is a recent substitute method for the potassium permanganate oxidation purification methodology. Seven ethyl ester homologues were formed in illicit cocaine from the transesterification of known tropane methyl esters or possibly ethyl esterification of their respective tropane C-2 carboxylic acids in the presence of ethanol. Exhibits containing these compounds were subjected to gas chromatographic-mass spectrometric analyses to determine their identity and were subsequently synthesized to verify their structures. Quantitative determinations were obtained from ion-pair chromatography isolation followed by gas chromatography with flame ionization detection. Specifically, hexanoylecgonine ethyl ester, cocaethylene, cis-cinnamoylecgonine ethyl ester, trans-cinnamoylecgonine ethyl ester, 3',4',5'-trimethoxybenzoylecgonine ethyl ester, cis-3',4',5'-trimethoxycinnamoylecgonine ethyl ester, and trans-3',4',5'-trimethoxycinnamoylecgonine ethyl ester were detected and characterized. When present, these compounds were detected at levels ranging from 8.6 x 10(-4) to 9.3 x 10(-1)% relative to cocaine.  相似文献   
806.
Abstract: In this study, we analyzed the entire mtDNA control region in 61 unrelated individuals from the Pas Valley (Cantabria), a human isolate from northern Spain, to evaluate the suitability of this analysis to increase the power of discrimination of this locus for forensic purposes in human isolates. Low values obtained for the diversity parameters confirmed the relative isolation of this human group. The main findings of this study indicated that even the analysis of the entire mtDNA control region may have important limitations for use in forensic casework when dealing with human isolates: none of the 44 individuals who exhibited identical HVI‐HVII haplotypes could be further differentiated by analysis of segment HVIII. Nevertheless, analysis of the entire mtDNA control region proved to be useful to determine the ancestry of the samples examined, by contributing to the confirmation, and, on occasion, even to the refinement of the haplogroup assignment.  相似文献   
807.
808.
This article offers a reformulation of the concept of professionalism as it applies to public sector decision making. After critically evaluating existing work, we present a role theoretic model of public sector decision making that provides a precise conceptual and operational meaning to the term professionalism. We then evaluate the model's applicability to public sector actors, using city managers as an example. Finally, we discuss some of the public policy implications of increasing public service professionalization.  相似文献   
809.
810.
We present an unusual case in which an adult female committed suicide by fire while enclosed in the trunk of her vehicle. A finding of suicide was reached only because several key investigative facts were uncovered. Without these discoveries the case may still remain open as a suspicious death. Fire is rarely used as a mechanism of suicide in Western culture, and, as such, similar cases should be reported to advance our recognition of this phenomenon.  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