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   22747篇
  免费   1428篇
各国政治   1097篇
工人农民   981篇
世界政治   1691篇
外交国际关系   954篇
法律   14383篇
中国共产党   2篇
中国政治   145篇
政治理论   4772篇
综合类   150篇
  2023年   112篇
  2021年   134篇
  2020年   514篇
  2019年   575篇
  2018年   706篇
  2017年   750篇
  2016年   829篇
  2015年   606篇
  2014年   686篇
  2013年   2735篇
  2012年   628篇
  2011年   653篇
  2010年   671篇
  2009年   707篇
  2008年   645篇
  2007年   699篇
  2006年   697篇
  2005年   628篇
  2004年   632篇
  2003年   540篇
  2002年   609篇
  2001年   784篇
  2000年   711篇
  1999年   574篇
  1998年   319篇
  1997年   256篇
  1996年   271篇
  1995年   269篇
  1994年   253篇
  1993年   244篇
  1992年   382篇
  1991年   392篇
  1990年   347篇
  1989年   328篇
  1988年   359篇
  1987年   318篇
  1986年   387篇
  1985年   378篇
  1984年   293篇
  1983年   282篇
  1982年   217篇
  1981年   203篇
  1980年   174篇
  1979年   252篇
  1978年   145篇
  1977年   120篇
  1976年   103篇
  1975年   107篇
  1974年   138篇
  1973年   93篇
排序方式: 共有10000条查询结果,搜索用时 326 毫秒
61.
COMPSTAT, the latest innovation in American policing, has been widely heralded as a management and technological system whose elements work together to transform police organizations radically. Skeptical observers suggest that COMPSTAT merely reinforces existing structures and practices. However, in trying to assess how much COMPSTAT has altered police organizations, research has failed to provide a broader theoretical basis for explaining how COMPSTAT operates and for understanding the implications of this reform. This article compares two different perspectives on organizations—technical/rational and institutional—to COMPSTAT's adoption and operation in three municipal police departments. Based on fieldwork, our analysis suggests that relative to technical considerations for changing each organization to improve its effectiveness, all three sites adopted COMPSTAT in response to strong institutional pressures to appear progressive and successful. Furthermore, institutional theory better explained the nature of the changes we observed under COMPSTAT than the technical/rational model. The greatest collective emphasis was on those COMPSTAT elements that were most likely to confer legitimacy, and on implementing them in ways that would minimize disruption to existing organizational routines. COMPSTAT was less successful when trying to provide a basis for rigorously assessing organizational performance, and when trying to change those structures and routines widely accepted as being "appropriate." We posit that it will take profound changes in the technical and institutional environments of American police agencies for police departments to restructure in the ways anticipated by a technically efficient COMPSTAT.  相似文献   
62.
63.
64.
In their article, Tippins and Wittmann articulate a strong position against custody evaluators making specific custody recommendations to the court. This response will focus on my thoughts about their concepts and my belief that recommendations can be useful and appropriate some of the time, even though there may be significant problems with certain types of recommendations and problems with some evaluators.  相似文献   
65.
A simple and sensitive method is described for quantitative analysis of chlorpromazine in blood, serum, urine and tissue homogenate. The chlorpromazine cation radical produced by adding perchloric acid and 2,3-dichloro-5,6-dicyano-p-benzoquinone to the sample can be detected by the ESR method at room temperature. The sensitivity limit is 10 ng, that is, 20 μl of the solution containing 0.5 μg chlorpromazine/ml. The time needed for the measurement is within 10 min. The chlorpromazine radical thus produced is very stable; for example, 95% of the radical was observed after 24 h. The advantage of this method is discussed by comparing with the ordinary spectrophotometry which requires the purification of the sample.  相似文献   
66.
Although there has been speculation regarding the pervasiveness and nature of judicial decisions regarding life-sustaining medical treatment (LSMT), no attempt has been made to empirically assess their prevalence or the issues they address. An exploratory study utilizing a mail survey of a nationwide random sample (N = 905) of state trial court judges was conducted to provide initial information regarding this decision-making process. Twenty-two percent of the responding judges had heard at least one LSMT case, and judicial review did not appear endemic to particular states. The number of judges hearing LSMT cases dropped from 1975 to 1981 but has increased since then. Three major issues predominate: patient competency, appointment of a surrogate decisionmaker, and resolution of the ultimate issue of forgoing LSMT. Relatively few cases either contested a prior directive's validity or involved imposing sanctions for instituting or forgoing LSMT. Although subject to different interpretations, the results suggest the courts are having a significant impact on certain aspects of the LSMT decision-making process. However, the infrequency with which any one judge is called upon to make an LSMT decision causes concern about the judiciary's ability to respond in a timely and appropriate manner. With their potential for a profound effect on the actions of health care providers, greater attention to this decision-making process is warranted.  相似文献   
67.
The possible contribution of poppy seed foods to positive opiate urinalysis results, especially from foods available in the Pacific Rim area, has recently become an issue for the U.S. Army Forensic Toxicology Drug Testing Laboratory in Hawaii. To assess the likelihood of this possible contribution, seven different poppy seed food products were consumed by male and female volunteers, and urine specimens were collected at time increments up to either 24 or 72 h. Specimens were evaluated for opiates using Roche Abuscreen radioimmunoassay (RIA), and all RIA positive specimens were analyzed for morphine and codeine using gas chromatography/mass spectrometry (GC-MS). Poppy seed cake, bagels, muffins, and rolls did not contain sufficient quantities of poppy seeds to give rise to opiate positive specimens by U.S. Department of Defense (DOD) GC-MS cutoff levels (morphine = 4000 ng/mL, codeine = 2000 ng/mL), although a number of specimens were positive by National Institute on Drug Abuse (NIDA) cutoff levels (morphine and codeine = 300 ng/mL). However, ingestion of poppy seed streusel or Danish pastry led to confirmed morphine and codeine positive specimens, irrespective of the use of DOD or NIDA confirmation cutoff values. In addition, significant amounts of codeine were observed in a number of these specimens. These findings argue against the unqualified application of previously published quantitative guidelines for eliminating poppy seed ingestion as a possible cause for a positive opiate urinalysis result.  相似文献   
68.
本文是2006年5月25日在香港大学召开的"中非人力资源开发与合作"学术研讨会的系列论文之一。作者基于贫困的持续性与其各构成要素的相互关联性这一机理,运用比较研究方法,测度和评析尼日利亚与中国的减贫政策及其实施效应,反映了国际学术界对减贫问题的研究动态。诚然,本文仅代表作者的观点。  相似文献   
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