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   1456篇
  免费   68篇
  2021年   16篇
  2020年   29篇
  2019年   29篇
  2018年   44篇
  2017年   40篇
  2016年   54篇
  2015年   32篇
  2014年   43篇
  2013年   178篇
  2012年   65篇
  2011年   58篇
  2010年   43篇
  2009年   49篇
  2008年   57篇
  2007年   45篇
  2006年   41篇
  2005年   33篇
  2004年   40篇
  2003年   40篇
  2002年   27篇
  2001年   21篇
  2000年   27篇
  1999年   22篇
  1998年   17篇
  1997年   13篇
  1996年   19篇
  1995年   11篇
  1993年   10篇
  1992年   15篇
  1991年   21篇
  1990年   15篇
  1989年   16篇
  1988年   9篇
  1987年   14篇
  1986年   11篇
  1985年   21篇
  1983年   16篇
  1982年   20篇
  1981年   10篇
  1980年   8篇
  1978年   11篇
  1977年   11篇
  1976年   17篇
  1975年   10篇
  1974年   8篇
  1973年   10篇
  1972年   21篇
  1970年   10篇
  1968年   13篇
  1935年   9篇
排序方式: 共有1524条查询结果,搜索用时 15 毫秒
41.
Twenty-nine infants exposed in utero to methadone and 37 comparison infants were examined on the Neonatal Behavioral Assessment Scale at early and late neonatal ages. All infants were full-term at birth, over 2500 g, and not yet circumcised at the early assessment. None of the methadone-exposed infants were breast-fed or were being treated pharmacologically for withdrawal. During the first week of life, methadone-exposed neonates differed from comparison ones in motoric behavior. Relative to comparison-group infants, they were jerkier and more tremulous, tense, active, and better able to put hand in mouth. By the end of the first month these differences diminished, although there was still a tendency for the methadone-exposed infants to have elevated body tonus. Neither perinatal complications, birth weight, nor sex of infant could explain the early neonatal differences between the methadone and comparison groups. Past the early stage of acute withdrawal, neonates exposed prenatally to methadone behave not unlike their nonexposed peers.  相似文献   
42.
Hans Lenk 《Man and World》1978,11(1-2):3-18
Ohne ZusammenfassungIn honor of Bishop Prof. Dr. H.-W. Heidland on the occasion of his 65th birthday.  相似文献   
43.
In this paper it is argued that the general problem of indication, increasingly discussed in the field of psychotherapy in recent years, actually is a pseudoproblem with no solution to be expected. In its objectives and premises it is trongly suggestive of conceptions and ideas of early logical empiricism, to be considered as out-of-date today. The concept of indication is identified as ambiguous, and preliminary remarks aiming at an explication of the concept are made. Finally, the consequences of our arguments for the immediate problem of integration of the different therapeutic approaches are pointed out.  相似文献   
44.
The methods of applied science are usually based on the findings of pure science, and the discovery of successful methods of therapy for the neuroses is dependent on the formulation of appropriate theories for these disorders. It is argued that the only viable theory about neurosis at the moment is an adaptation of the Watsonian conditioning model, suitably altered to fit in with more recent discoveries in the fields of the formation and extinction of conditioned responses. Such a model has important relevance to behaviour therapy and the various methods for treating neuroses falling under that heading, and indeed for an explanation of the apparent effectiveness of psychotherapy, psychoanalysis, and whatever events mediate spontaneous remission.  相似文献   
45.
Equitone sequences are defined as sequences of tones that are identical in all respects: frequency, spectral composition, intensity, and duration. The only parameter varied in these sequences is the time-interval between tones. In such sequences, clear accents are perceived. This paper describes accent perception in equitone sequences containing two alternating intervals; such sequences are perceived as consisting of repeating groups of two tones. An accent is heard on the first tone of a group if the difference between the intervals is about 5% to 10%. If the difference is made bigger, the accent is heard on the last tone of the group; this latter accent is considerably stronger than the accent previously heard on the first tone. In a number of experiments, the conditions under which the two types of accents occur were investigated. From these experiments, it was tentatively concluded that the accent on the last tone is heard because that tone, since it is followed by a longer interval, can be processed more completely. This “intervalproduced” accent indeed occurs only if the between-group interval is considerably longer than the within-group interval and if the latter does not exceed a duration of about 250 msec. The effect is slightly dependent on tone duration. The interval-produced accent can be balanced if the nonaccented tone is increased by about 4 dB in intensity. This shows that the effect is quite robust. The specific type of accentuation reported here might explain some rhythmical phenomena, examples of which are given.  相似文献   
46.
The Ramey and Haskins intervention experiment succeeded in producing IQ gains at three years of age averaging about one standard deviation in young children who were selected for being at risk for subnormal intellectual development. The study is examined in terms of its consistency with other findings, the heritability of IQ, the g aspect of IQ, the simplex pattern of longitudinal interage mental test score correlations, mother-child IQ correlations, and criteria for establishing educationally and socially significant gains in intelligence defined as g rather than as a score on a particular test. Narrow transfer of training from cognitive intervention techniques to IQ test performance in early childhood, rather than enhancement of the g factor itself, is hypothesized as a cause of the typical fadeout of early IQ gains in later childhood.  相似文献   
47.
Summary Sixty subjects were shown pictures each containing two objects (A and B). The objects were unobtrusive with respect to relative properties such as long — short, big — small, etc. The pictures were preceded by sentences referring either to objects A and B or only to object A. Object A was dimensionally specified: The same object was called, e.g., long for one and short for a different subject. Ratings during a later test (without presentation of the pictures) revealed that not only were objects A remembered according to the verbal specification provided during the presentation but ratings of objects B also changed in line with the specification of A. This was true even when object B had not been mentioned verbally during the presentation. In this way, verbal specifications had an effect beyond the referential bond. It is concluded that models based on the assumption that the semantic interpretation of an event depends on the application of syntactic rules — rules indicating, e.g., to which object an adjective refers — lack an important clue.  相似文献   
48.
A characterization of stochastic independence in terms of association of random variables is given. The result is applied to yield a simple proof of the Sattath-Tversky inequality without continuity assumptions.  相似文献   
49.
Forty-five patients with unilateral demarcated vascular lesions in the basal ganglia, the thalamus and the deep white matter were investigated with an "aphasia battery." Patients with basal ganglia lesions performed worse than both other groups in tests of articulation, syntax, and lexical functions. The deficit of patients with basal ganglia lesions on all expressive language modalities was lateralized to the left hemisphere. Patients with left thalamic lesions showed impairments of speech fluency and in the Token Test. Patients with white matter lesions alone showed no effect of laterality in tests of language functions. The results are discussed on the basis of a recent theory of the participation of the deep nuclei in language processing.  相似文献   
50.
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