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   952篇
  免费   14篇
  966篇
  2020年   16篇
  2019年   13篇
  2018年   18篇
  2017年   27篇
  2016年   22篇
  2015年   11篇
  2014年   12篇
  2013年   112篇
  2012年   50篇
  2011年   31篇
  2010年   29篇
  2009年   21篇
  2008年   39篇
  2007年   31篇
  2006年   26篇
  2005年   27篇
  2004年   16篇
  2003年   23篇
  2002年   36篇
  2001年   14篇
  2000年   13篇
  1999年   12篇
  1998年   10篇
  1996年   13篇
  1995年   7篇
  1994年   8篇
  1993年   10篇
  1992年   11篇
  1991年   10篇
  1990年   8篇
  1989年   11篇
  1988年   11篇
  1987年   16篇
  1986年   14篇
  1985年   13篇
  1984年   20篇
  1981年   7篇
  1980年   10篇
  1979年   8篇
  1977年   19篇
  1976年   10篇
  1975年   9篇
  1974年   18篇
  1973年   9篇
  1972年   13篇
  1971年   7篇
  1969年   8篇
  1967年   10篇
  1966年   12篇
  1965年   7篇
排序方式: 共有966条查询结果,搜索用时 15 毫秒
201.
Though multiple task interviews are often preferable for family interaction research, clinical-style interviews have a rôle to play. The 'Standardized Clinical Family Interview', whose development, structure and mode of administration have been described in an earlier paper, is designed to elicit family interaction in a clinically relevant fashion. A series of studies which evaluated the reliability, sensitivity, validity and acceptability of this instrument is now provided. The results suggest that the SCFI is useful and deserves further study; however, interviewer training is a major task.  相似文献   
202.
When deleted segments of speech are replaced by extraneous sounds rather than silence, the missing speech fragments may be perceptually restored and intelligibility improved. This phonemic restoration (PhR) effect has been used to measure various aspects of speech processing, with deleted portions of speech typically being replaced by stochastic noise. However, several recent studies of PhR have used speech-modulated noise, which may provide amplitude-envelope cues concerning the replaced speech. The present study compared the effects upon intelligibility of replacing regularly spaced portions of speech with stochastic (white) noise versus speech-modulated noise. In Experiment 1, filling periodic gaps in sentences with noise modulated by the amplitude envelope of the deleted speech fragments produced twice the intelligibility increase obtained with interpolated stochastic noise. Moreover, when lists of isolated monosyllables were interrupted in Experiment 2, interpolation of speech-modulated noise increased intelligibility whereas stochastic noise reduced intelligibility. The augmentation of PhR produced by modulated noise appeared without practice, suggesting that speech processing normally involves not only a narrowband analysis of spectral information but also a wideband integration of amplitude levels across critical bands. This is of considerable theoretical interest, but it also suggests that since PhRs produced by speech-modulated noise utilize potent bottom-up cues provided by the noise, they differ from the PhRs produced by extraneous sounds, such as coughs and stochastic noise.  相似文献   
203.
The intelligibility of word lists subjected to various types of spectral filtering has been studied extensively. Although words used for communication are usually present in sentences rather than lists, there has been no systematic report of the intelligibility of lexical components of narrowband sentences. In the present study, we found that surprisingly little spectral information is required to identify component words when sentences are heard through narrow spectral slits. Four hundred twenty listeners (21 groups of 20 subjects) were each presented with 100 bandpass filtered CID ( “everyday speech ”) sentences; separate groups received center frequencies of 370, 530, 750, 1100, 1500, 2100, 3000, 4200, and 6000 Hz at 70 dBA SPL. In Experiment 1, intelligibility of single 1/3-octave bands with steep filter slopes (96 dB/octave) averaged more than 95% for sentences centered at 1100, 1500, and 2100 Hz. In Experiment 2, we used the same center frequencies with extremely narrow bands (slopes of 115 dB/octave intersecting at the center frequency, resulting in a nominal bandwidth of l/20 octave). Despite the severe spectral tilt for all frequencies of this impoverished spectrum, intelligibility remained relatively high for most bands, with the greatest intelligibility (77%) at 1500 Hz. In Experiments 1 and 2, the bands centered at 370 and 6000 Hz provided little useful information when presented individually, but in each experiment they interacted synergistically when combined. The present findings demonstrate the adaptive flexibility of mechanisms used for speech perception and are discussed in the context of the LAME model of opportunistic multilevel processing.  相似文献   
204.
Biomechanical motor patterns in normal walking   总被引:10,自引:0,他引:10  
Motor patterns in normal human gait are evident in several biomechanical and EMG analyses over the stride period. Some of these patterns are invariant over the stride period with changes of cadence, whole others are closely correlated with speed changes. The findings for slow, natural, and fast walking are summarized: 1. Joint angle patterns over the stride period are quite invariant, and do not change with cadence; 2. Moment of force patterns at the ankle are least variable and quite consistent at all speeds; 3. A recently defined support moment is quite consistent at all speeds. 4. Moments at the knee and hip are highly variable at all cadences but decrease their variability as cadence increases; 5. Mechanical power patterns at all joints show consistent timing over the stride period; 6. EMG profiles of 5 muscles show consistent timing over the stride, but the amplitude increases as walking speed increases. Arguments are presented to support the concept that walking speed is largely controlled by gain and that the timing of the motor patterns, which is extremely tightly synchronized with the anatomical position, is under major afferent control.  相似文献   
205.
206.
Two experiments investigated characteristic generalized imitation procedures on a nonimitative successive visual discrimination task. In Experiment I, no discriminative behavior was obtained though a number of procedures designed to enhance discrimination were employed. The introduction of a differential modeling procedure after nine or 10 sessions of nondifferential performance was ineffective in producing differential responding for three of four Ss. In the second experiment, the differential modeling procedure was introduced as an initial manipulation and was successful in establishing discriminative performance in all Ss. After several sessions of differential responding, the observation of a model performing nondifferentially was relatively ineffective in altering the pattern of responding. These results suggest (1) that modeling may be functional in altering a S's behavior depending on what point in the procedures the manipulation is introduced and (2) that certain procedural variables may define a functional response class characterized by the failure to develop discriminative responding.  相似文献   
207.
Two experiments were designed to investigate the factors involved in the visual facilitation of auditory localization. In both experiments, adult human Ss pointed to targets in a variety of visual conditions. The results of the first experiment showed that target-directed eye movements were important. In the second experiment, eye localization was assessed, along with pointing localization. Both eye and hand localization of the hidden auditory targets were better when target-directed eye movements were made in a lighted environment than when made in the dark. Data also suggested that Ss have better knowledge of their eye position in the light. Possible mechanisms for the involvement of eye movements were suggested, and the theoretical importance of the results was discussed.  相似文献   
208.
209.
K C Warren  R W Johnson 《Adolescence》1989,24(95):505-522
This study investigated the relationships among family environment, demographic measures, the decisions made by unintentionally pregnant adolescents regarding postdelivery plans and the certainty with which these decisions were made. Subjects were 175 pregnant adolescents, ages 14 through 22, who intended to carry their pregnancies to term. Greater uncertainty was associated with living with both natural parents or with mother only. Higher levels of negative affect were related to lower levels of perceived family cohesion, independence, expressiveness, and intellectual-cultural orientation. Age, trimester of pregnancy, and family constellation also were related to levels of negative affect. Discriminant analysis revealed that subjects choosing adoption were more likely to be older and to be white than were those choosing to keep the child. They also tended to perceive higher levels of expressiveness and independence in their families. The implications of these findings for the delivery of services and for future research efforts in this area are discussed.  相似文献   
210.
A procedure is developed for decomposing any finite algebra into a minimal set of maximally independent simple homomorphic images, or factors, of the algebra. The definition of admissible sets of factors is made in relation to the congruence lattice of the algebra, and generalises the notion of an irredundant reduction in a modular lattice. An algorithm for determining all possible sets of factors of a given finite algebra is derived and an index for measuring the degree of independence of factors is defined. Applications of the technique to finite algebraic models within the social psychological domain are presented and include factorizations for certain semigroups of binary relations and for a class of finite semilattices.  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