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   42365篇
  免费   1663篇
  国内免费   17篇
  2020年   421篇
  2019年   465篇
  2018年   682篇
  2017年   698篇
  2016年   733篇
  2015年   547篇
  2014年   705篇
  2013年   3240篇
  2012年   1224篇
  2011年   1220篇
  2010年   813篇
  2009年   772篇
  2008年   1111篇
  2007年   1109篇
  2006年   1013篇
  2005年   895篇
  2004年   878篇
  2003年   819篇
  2002年   844篇
  2001年   1286篇
  2000年   1276篇
  1999年   975篇
  1998年   463篇
  1997年   461篇
  1996年   448篇
  1992年   833篇
  1991年   776篇
  1990年   784篇
  1989年   698篇
  1988年   712篇
  1987年   677篇
  1986年   706篇
  1985年   694篇
  1984年   625篇
  1983年   550篇
  1982年   420篇
  1979年   617篇
  1978年   517篇
  1977年   437篇
  1976年   442篇
  1975年   551篇
  1974年   667篇
  1973年   690篇
  1972年   519篇
  1971年   526篇
  1970年   475篇
  1969年   529篇
  1968年   635篇
  1967年   579篇
  1966年   561篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
181.
Previous research has suggested that women with a negative emotional orientation toward sexuality (i.e., erotophobia) have difficulty learning and retaining sexually relevant material such as contraceptive information. It has been hypothesized that these women become aroused by this material and that this arousal interferes with their ability to learn it. The importance of this issue led us to conduct the current study. Erotophobic and erotophilic women viewed presentations about contraception while their physiological responses were being monitored. In addition, they were tested on the information contained in the presentation before, immediately after, and again 4-6 weeks after the presentation. The results indicated that the erotophobic women knew less contraceptive information before the presentation and were more aroused by the presentation. This arousal, however, did not interfere with retention of the material. These results are discussed in terms of individual differences in reactions to sexual material and the ability to learn, retain, and use contraceptive information.  相似文献   
182.
183.
184.
185.
186.
Ratings of pre-morbid intelligence level, derived from the hospital charts of 26 chronic schizophrenics, were correlated with the post-mortem brain volume measures of cortex, white matter, central grey matter, and ventricles. Contrary to hypothesis, no significant correlations were found.  相似文献   
187.
The IES Arrow-Dot was administered to 41 cocaine detoxification patients. This group's scores indicated lower ego functioning and higher impulsivity and superego functioning than other clinical samples. No significant differences were noted between the Arrow-Dot scores of patients who successfully completed the program and those who did not.  相似文献   
188.
Multidimensional studies of Munsell color solid   总被引:1,自引:0,他引:1  
  相似文献   
189.
M. W. Bunder 《Studia Logica》1988,47(2):129-143
In the early thirties, Church developed predicate calculus within a system based on lambda calculus. Rosser and Kleene developed Arithmetic within this system, but using a Godelization technique showed the system to be inconsistent.Alternative systems to that of Church have been developed, but so far more complex definitions of the natural numbers have had to be used. The present paper based on a system of illative combinatory logic developed previously by the author, does allow the use of the Church numerals. Given a new definition of equality all the Peano-type axioms of Mendelson except one can be derived. A rather weak extra axiom allows the proof of the remaining Peano axiom. Note. The illative combinatory logic used in this paper is similar to the logic employed in computer languages such as ML.The author wishes to thank Dr. Roger Hindley for proofreading this paper and for making some useful suggestions. This paper was presented at the 1986 Annual Conference of the Australasian Association of Logic in Auckland, 9–12 July, 1986.  相似文献   
190.
Strings of four unrelated letters were presented for subjects to identify, followed by a patterned mask and then a forced choice test of each letter position. In Experiment 1, the type style in the regular conditions was consistent--all of the letters were of a single type font--whereas in the mixed condition, each string contained letters from two type fonts. Compared with the mixed condition, accuracy in the regular conditions was higher overall and increased at a faster rate as a function of processing time. This held across four sessions. In Experiment 2, the font in the mixed condition was varied either between or within letter strings; sizeable advantages for the regular conditions were found with both mix-methods. The results are consistent with the idea of a schemalike perceptual system that becomes tuned to the regularities of a particular font in order to process visual information efficiently.  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