全文获取类型
收费全文 | 27985篇 |
免费 | 472篇 |
国内免费 | 4篇 |
出版年
2021年 | 81篇 |
2020年 | 143篇 |
2019年 | 170篇 |
2018年 | 3636篇 |
2017年 | 3025篇 |
2016年 | 2472篇 |
2015年 | 374篇 |
2014年 | 311篇 |
2013年 | 986篇 |
2012年 | 903篇 |
2011年 | 2698篇 |
2010年 | 2695篇 |
2009年 | 1687篇 |
2008年 | 1979篇 |
2007年 | 2440篇 |
2006年 | 309篇 |
2005年 | 481篇 |
2004年 | 415篇 |
2003年 | 360篇 |
2002年 | 311篇 |
2001年 | 167篇 |
2000年 | 206篇 |
1999年 | 147篇 |
1998年 | 138篇 |
1997年 | 135篇 |
1996年 | 120篇 |
1995年 | 100篇 |
1994年 | 95篇 |
1993年 | 79篇 |
1992年 | 108篇 |
1991年 | 81篇 |
1990年 | 80篇 |
1989年 | 68篇 |
1988年 | 70篇 |
1987年 | 60篇 |
1986年 | 63篇 |
1985年 | 79篇 |
1984年 | 81篇 |
1983年 | 69篇 |
1982年 | 95篇 |
1981年 | 90篇 |
1980年 | 68篇 |
1979年 | 72篇 |
1978年 | 59篇 |
1977年 | 84篇 |
1976年 | 58篇 |
1975年 | 68篇 |
1974年 | 60篇 |
1973年 | 65篇 |
1972年 | 51篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
Peter S. H. Tang 《Studies in East European Thought》1972,12(4):391-400
132.
Judgments of the acceptability of correct, word order reversed, and semantically anomalous sentences were elicited from 2- and 3-year-old children in a game played with hand puppets. All of the sentences used were simple imperatives and each child was asked to correct those he called wrong. Performance on the judgment task was correlated with each child's mean length of utterance and with his comprehension of reversible active and passive sentences. Only the linguistically most advanced children were able to make a significant number of appropriate judgments and corrections of reversed word order imperatives. Less developed children could appropriately judge and correct semantically anomalous but not incorrect word order imperatives. The importance of semantic as opposed to syntactic factors in children's judgments of the acceptability of sentences is stressed.This research was supported in part by PHS Grant HD-02908 from the National Institute of Child Health and Development. Roger Brown is the principal investigator. 相似文献
133.
Peter F. Galvani 《Behavior research methods》1970,2(5):232-233
In the first of two experiments, it was demonstrated that an air puff elicited a reliable startle reflex in rats which showed no habituation over 50 trials. In the second study an attempt was made to measure an emotional response by recording startle reactions to the air puff during presentation of a presumed fear-eliciting CS. It was concluded that the air-puff-elicited startle reflex can be employed as an indirect measure of a hypothetical emotional response. 相似文献
134.
The plastic barrel suit provides complete protection of chronically implanted fistulas and electrical connectors. The lost time, expense, and the frustrations of having these devices damaged was avoided. 相似文献
135.
Peter B. Denes 《Behavior research methods》1970,2(1):1-5
The generation of satisfactory artificial speech involves a great variety of semantic, linguistic, and articulatory factors. Many of these complex elements are as yet unknown, and computers are used extensively for their investigation. An account of an on-line, interactive computer facility used for such research at Bell Laboratories is given. The use of this facility for exploring the duration and pitch correlates of stress in English sentences is described. 相似文献
136.
137.
Peter G. Polson 《Psychometrika》1970,35(1):51-72
Greeno and Steiner have shown that a three state Markov Chain with a single absorbing state is equivalent to many of the current formalizations of All-or-None learning theories. Distribution statistics and other summary statistics are derived from the general model. Expressions for the maximum likelihood estimators of its parameters and the sampling variances of the estimates are presented. Likelihood ratio tests for several different null hypotheses are derived. These tests permit one to evaluate the usual null hypotheses in terms of the parameters of a process model.This research was supported in part by a USPHS Predoctoral Research Fellowship, 1-F1-MH-31-289-01, by a grant from the Graduate School of the University of Texas, and by grant HD-02212-01 from the National Institute of Child Health and Human Development to Dr. John Theios. 相似文献
138.
Past studies have shown that stuttering is eliminated when speech is synchronized with a metronomic beat, but the speech sounds artificial. The present study investigated the effect of increasing the duration of these individual stimulus beats with the stimulus-off period constant at 1 sec. When subjects were instructed to speak during the stimulus-on period, stuttering was an inverse function of stimulus duration, indicating that the known metronome effect on stuttering is one point on a continuum of effective rhythm procedures. The "naturalness" of speech increased as the stimulus duration increased up to durations of about 2 sec, and then decreased. At optimal values, stuttering was greatly reduced and naturalness and rapidity of speech were retained. These optimal values effectively controlled stuttering in a field test that used two types of specially designed portable instruments, one of which produced a tactual stimulus and the other an auditory stimulus. 相似文献
139.
Aubrey J. Yates Peter J. Smith Bryan D. Burke Maureen A. Keane 《Behavior research methods》1969,1(7):257-258
Procedures are described for the generation, synchronization. and accurate spacing of discrete dichotic stimulation material. A suggested standard definition of interpair interval is proposed. 相似文献
140.
Peter H. Stoloff 《Attention, perception & psychophysics》1969,6(6):333-336
Stochastically textured patterns were used to investigate the sensitivity of Ss to differences in the statistical distributions of locally defined properties of element density and shape. The results of the study indicate that when the textures were most structured, in terms of their variance, Ss were most accurate at detecting dissimilarities between pairs of patterns. Ss also rated the similarity of the statistical distributions of elements of patterns differing in local properties. Multidimensional scaling analysis of the ratings showed two dimensions, representing monotonic orderings of the stimuli. 相似文献