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   23889篇
  免费   1085篇
  国内免费   17篇
  2020年   334篇
  2019年   366篇
  2018年   508篇
  2017年   537篇
  2016年   535篇
  2015年   430篇
  2014年   482篇
  2013年   2181篇
  2012年   843篇
  2011年   929篇
  2010年   548篇
  2009年   552篇
  2008年   761篇
  2007年   727篇
  2006年   649篇
  2005年   592篇
  2004年   585篇
  2003年   547篇
  2002年   553篇
  2001年   807篇
  2000年   800篇
  1999年   576篇
  1998年   303篇
  1997年   253篇
  1996年   221篇
  1995年   231篇
  1994年   194篇
  1993年   205篇
  1992年   432篇
  1991年   390篇
  1990年   401篇
  1989年   394篇
  1988年   374篇
  1987年   338篇
  1986年   361篇
  1985年   370篇
  1984年   306篇
  1983年   265篇
  1981年   191篇
  1979年   233篇
  1978年   222篇
  1975年   246篇
  1974年   293篇
  1973年   243篇
  1972年   240篇
  1971年   196篇
  1969年   221篇
  1968年   231篇
  1967年   192篇
  1966年   214篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
Basing on the author's experiences during his study stay at the Serbsky All-Union Research Institute for General and Forensic Psychiatry in Moscow a report is given about the theoretical foundations and the carrying-out of forensic-psychiatric expert-opinions in the field of penal as well as civil law in the U.S.S.R. Some peculiarities in comparison with the practice in the G.D.R. are taken in special account.  相似文献   
103.
The Rosenberg Self-esteem Scale was administered to 550 14- and 16-yr.-old (+/- 6 mo.) girls. Self-esteem scores were categorized by weight and weight by height. Scores on the Quetelet Index for obesity were correlated with self-esteem scores. Mean self-esteem of the low- and middle-weight by height group was significantly higher than the mean of the high-weight by height group. In analyzing weight alone, the self-esteem of the middle-weight group was significantly higher than the self-esteem of the high-weight group. The correlation of the obesity index and self-esteem indicated that as weight increased self-esteem decreased.  相似文献   
104.
105.
106.
107.
108.
109.
Hierarchical classes: Model and data analysis   总被引:1,自引:0,他引:1  
A discrete, categorical model and a corresponding data-analysis method are presented for two-way two-mode (objects × attributes) data arrays with 0, 1 entries. The model contains the following two basic components: a set-theoretical formulation of the relations among objects and attributes; a Boolean decomposition of the matrix. The set-theoretical formulation defines a subset of the possible decompositions as consistent with it. A general method for graphically representing the set-theoretical decomposition is described. The data-analysis algorithm, dubbed HICLAS, aims at recovering the underlying structure in a data matrix by minimizing the discrepancies between the data and the recovered structure. HICLAS is evaluated with a simulation study and two empirical applications.This research was supported in part by a grant from the Belgian NSF (NFWO) to Paul De Boeck and in part by NSF Grant BNS-83-01027 to Seymour Rosenberg. We thank Iven Van Mechelen for clarifying several aspects of the Boolean algebraic formulation of the model and Phipps Arabie for his comments on an earlier draft.  相似文献   
110.
Stress in time     
The goals of this research were to determine whether speakers adjust the stress patterns of words within sentences to create an alternation between strong and weak beats and to explore whether this rhythmic alternation contributes to the characteristics stress differences between two major lexical categories of English. Two experiments suggested that speakers do alter lexical stress in accordance with rhythmic biases. When speakers produced disyllabic pseudowords in sentence contexts, they were more likely to place stress on the first syllable when the pseudoword was preceded by a weak stress and followed by a strong one than when the strong stress preceded and the weak followed. This occurred both when the pseudowords served as nouns and when they served as verbs. Text analyses further revealed that weakly stressed elements precede nouns more often than verbs, whereas such elements follow verbs more often than nouns. Thus, disyllabic nouns are more likely than disyllabic verbs to occupy contexts biased toward trochaic rhythm, a finding consistent with leftward dominant stress in disyllabic English nouns. The history of stress changes in English nouns and verbs also conforms with the view that rhythmic context may have contributed to the evolution of stress differences. Together, the findings suggest that the citation stress patterns of words may to some degree reflect adaptations of lexical knowledge to conditions of language performance.  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