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   809篇
  免费   33篇
各国政治   33篇
工人农民   26篇
世界政治   71篇
外交国际关系   46篇
法律   479篇
中国共产党   2篇
中国政治   11篇
政治理论   136篇
综合类   38篇
  2023年   7篇
  2022年   7篇
  2021年   6篇
  2020年   24篇
  2019年   22篇
  2018年   25篇
  2017年   25篇
  2016年   32篇
  2015年   24篇
  2014年   33篇
  2013年   101篇
  2012年   37篇
  2011年   35篇
  2010年   43篇
  2009年   34篇
  2008年   36篇
  2007年   25篇
  2006年   29篇
  2005年   42篇
  2004年   32篇
  2003年   28篇
  2002年   25篇
  2001年   27篇
  2000年   25篇
  1999年   10篇
  1998年   16篇
  1997年   3篇
  1996年   7篇
  1995年   10篇
  1994年   4篇
  1993年   3篇
  1992年   2篇
  1991年   3篇
  1990年   5篇
  1989年   7篇
  1988年   7篇
  1987年   2篇
  1986年   9篇
  1983年   6篇
  1982年   3篇
  1979年   1篇
  1978年   2篇
  1977年   1篇
  1976年   2篇
  1974年   4篇
  1973年   1篇
  1972年   2篇
  1969年   1篇
  1967年   3篇
  1963年   1篇
排序方式: 共有842条查询结果,搜索用时 93 毫秒
151.
152.
Psychological pain has been reported to be major contributing factor for completed suicide, and classical suicidology based its wisdom on this construct. In this paper we report the case of a patient whose family experienced a high number of suicides apparently due to an escalation of psychological pain in the family members after the successive suicides. We also briefly discuss the problem of helping survivors after the suicide of loved one.  相似文献   
153.
神话话语的神话性,典型地反映了与经验思维完全不同的神话思维模式.对神话话语的传播过程的探讨,是研究人类文明传承机制的重要一环.神话话语的交流或传播,只有放在人类一般交流方式的总体框架内加以考察,才有可能揭示其中的本质规律.  相似文献   
154.
Abstract

This article develops and tests a model that explains election outcomes on the basis of party strategy. It employs a new comparative dataset linking representative mass surveys from six European countries with Twitter analysis of campaign activity. The expectation is that parties whose issue agendas exploit electoral opportunities while avoiding risks will be rewarded at the polls. These risks and opportunities are modelled using issue yield, a general framework summarising public support, electoral alignments, and party credibility. Empirically, the article traces a three-step process: (1) the configuration of electoral risks and opportunities (which is captured through public opinion surveys) guides party communication (measured with Twitter data), and to the degree that (2) parties design their campaigns strategically (identified through issue yield), this in turn (3) improves their electoral performance (measured using official statistics). The analysis explains some of the most salient election outcomes of recent years.  相似文献   
155.
156.
Two cases of acute intoxication of buflomedil hydrochloride are reported. The analysis of this compound was performed by an Extrelut extraction followed by a gas chromatographic-mass spectrometric determination. Analytical parameters of linearity, reproducibility and specificity were satisfactory.  相似文献   
157.
文化性的缺失—论课程的文化锁定现象   总被引:5,自引:0,他引:5  
课程起源于化传承的需要,传递、复制、再生产社会化是学校课程唯一不变的使命。在课程发展中形成了特定的化锁定现象。它造成了课程应具有的自的化品性及其所必然引发的内在的、独立的价值标准与宗旨的消解。课程成了现实社会主流化的“代言人”。它具有诠释、粉饰及原样传递的职责,却无反思、批判、创新的品质。学校教育的工具品性、灌输与训练机制、教育教学理论的学术品质等,都是课程化锁定现象所造成的化性缺失的必然结果。揭示课程化性缺失的病理表征,是使课程由化的工具存在转变为化的主体存在的重要前题。  相似文献   
158.
Keratins represent the principal structural proteins of hair. They are also found in horn, nail, claw, hoof, and feather. Hair and nail samples from human and canine sources and hair samples from mule deer, white tail deer, cat, moose, elk, antelope, caribou, raccoon, and goat were studied. Parrot and goose feathers were also analyzed. Keratins are polymorphic, and species differences are known to exist. Proteinaceous extracts of deer and antelope antlers and bovine and rhinoceros horn were prepared by solubilizing 10 mg of horn sample in 200 microL of a solution containing 12M urea, 74mM Trizma base, and 78mM dithiothreitol (DTT). Extraction took place over a 48-h period. A 25-microL aliquot of extract was removed and incubated with 5 microL of 0.1 M DTT for 10 min at 25 degrees C. Keratins were then separated by isoelectric focusing (IEF) on 5.2% polyacrylamide gels for 3 h and visualized using silver staining. At least 20 bands could be observed for each species studied. However, band patterns differed in the position of each band, in the number of bands, and in band coloration resulting from the silver staining process. Horn from two species of rhinoceros was examined. For both specimens, most bands occurred in the pH range of 4 to 5. Although similar patterns for both species were observed, they differed sufficiently to differentiate one from the other. As might be expected, the closer two species are related phylogenetically, the greater the similarity in the IEF pattern produced from their solubilized keratin.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   
159.
A discriminant function analysis of deciduous teeth to determine sex   总被引:3,自引:0,他引:3  
Studies of deciduous teeth have concluded that crown size differences in these teeth between males and females are not reliable sex discriminators, in contrast to such differences in permanent teeth. This study measured the mesiodistal and faciolingual crown diameters of all deciduous teeth, as well as those of the permanent first molars, of 162 children from the Burlington Orthodontic Growth Study, conducted earlier in Burlington, Ontario, Canada. All 40 deciduous tooth diameters (20 mesiolingual and 20 faciolingual) were significantly different between the sexes, as were the permanent tooth diameters. Using three to five measurements of deciduous teeth, discriminant analyses of several samplings of these children produced discriminant functions in which 76 to 90% of the holdout samples were correctly classified by sex. Combinations of deciduous and permanent measurements were used to classify 83 to 85% of the holdout samples correctly. When compared with published data on other sample populations, the Burlington group is the most dimorphic for deciduous teeth and is within the range of permanent tooth dimorphisms of other populations. The level of classification accuracy, when using discriminant analysis of the deciduous teeth, can approach the accuracy levels of analysis using the permanent teeth.  相似文献   
160.
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