全文获取类型
收费全文 | 3257篇 |
免费 | 368篇 |
国内免费 | 331篇 |
专业分类
3956篇 |
出版年
2024年 | 3篇 |
2023年 | 97篇 |
2022年 | 83篇 |
2021年 | 138篇 |
2020年 | 207篇 |
2019年 | 202篇 |
2018年 | 187篇 |
2017年 | 210篇 |
2016年 | 196篇 |
2015年 | 154篇 |
2014年 | 194篇 |
2013年 | 612篇 |
2012年 | 137篇 |
2011年 | 196篇 |
2010年 | 119篇 |
2009年 | 165篇 |
2008年 | 157篇 |
2007年 | 134篇 |
2006年 | 101篇 |
2005年 | 112篇 |
2004年 | 78篇 |
2003年 | 65篇 |
2002年 | 70篇 |
2001年 | 35篇 |
2000年 | 40篇 |
1999年 | 34篇 |
1998年 | 31篇 |
1997年 | 15篇 |
1996年 | 19篇 |
1995年 | 24篇 |
1994年 | 15篇 |
1993年 | 14篇 |
1992年 | 14篇 |
1991年 | 7篇 |
1990年 | 3篇 |
1989年 | 7篇 |
1988年 | 10篇 |
1987年 | 3篇 |
1986年 | 7篇 |
1985年 | 13篇 |
1984年 | 10篇 |
1983年 | 10篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1980年 | 5篇 |
1979年 | 3篇 |
1978年 | 5篇 |
1977年 | 3篇 |
1976年 | 3篇 |
1975年 | 2篇 |
排序方式: 共有3956条查询结果,搜索用时 9 毫秒
981.
The Effects of Early English Learning on Auditory Perception of English Minimal Pairs by Taiwan University Students 总被引:1,自引:0,他引:1
Auditory perception of English minimal pairs was tested with or without noise background. Each subject was interviewed after the test to collect information regarding their early experience on learning English as a foreign language. This study was designed to examine the differential effects of learning English at three age-starting points and two learning durations. This study hopes to determine how childhood experience of English learning (which is not mandatory in public elementary schools) has affected the auditory competence of university students in distinguishing English minimal pairs. Results showed that age effects were salient only under condition of noise background. Without the interference of background noise, most subjects performed well enough to obliterate any potential differences. 相似文献
982.
Previous research demonstrated that social phobia is characterized by content-specific interpretation and judgmental biases. The present study investigated whether this interpretation bias occurs not only in ambiguous, but also in positive and negative social events, and whether social phobic patients (SPs) are more characterized by a judgmental bias in costs than in probability. Besides, we argued that the judgmental bias observed in former studies could also be attributed to accurate estimations of SPs (of, for example, stuttering). Therefore, we assessed judgmental bias by the ratings of probability and costs of a negative evaluation (e.g. ‘people dislike me’) and not, as in previous studies, of negative social events (e.g. ‘stuttering’). SPs (n=228) and normal controls (n=33) were presented social and non-social events ranging from positive to profoundly negative. They ranked four different interpretations on likelihood to assess interpretation bias, and rated the profoundly negative interpretation on probability and cost to assess judgmental bias. SPs demonstrated content-specific interpretation and judgmental biases that also occurred in positive and negative social events. In contrast with expectations, SPs were characterized by a judgmental bias in both costs and probability. 相似文献
983.
Two experiments investigated whether novel phonotactic regularities, not present in English, could be acquired by 16.5-month-old infants from brief auditory experience. Subjects listened to consonant-vowel-consonant syllables in which particular consonants were artificially restricted to either initial or final position (e.g. /baep/ not /paeb/). In a later head-turn preference test, infants listened longer to new syllables that violated the experimental phonotactic constraints than to new syllables that honored them. Thus, infants rapidly learned phonotactic regularities from brief auditory experience and extended them to unstudied syllables, documenting the sensitivity of the infant's language processing system to abstractions over linguistic experience. 相似文献
984.
985.
Discrimination of direction of movements in pigeons following previous experience of motion/static discrimination 下载免费PDF全文
Two experiments examined pigeons' discrimination of directional movement using pictorial images shown on computer monitors. Stimuli consisted of the movement of a bird against a stationary background or the movement of the background behind a stationary bird. In Experiment 1, pigeons were trained to discriminate either leftward or rightward motion of either the bird or the background from stationary frames drawn from the same movies. The background-discrimination group acquired the discrimination faster than the bird-discrimination group. In Experiment 2, transfer of the discrimination from the task of Experiment 1 to a discrimination between motion directions was examined. Most of the pigeons learned this discrimination rapidly, whereas in a pilot study in which direction discrimination was trained without previous static/movement discrimination, learning was poor. It appears that an experimental history of movement against stationary discrimination promoted the pigeons' learning of the directional motion discrimination. 相似文献
986.
整体与部分的关系对汉字的知觉分离影响的研究 总被引:15,自引:3,他引:12
采用命名技术探讨了整体与部分的关系对汉字知觉分离的影响。实验一探讨了在由相同构字部件组成的汉字整体中部件从整体中分离出来的情况。结果表明,在由相同构字部件组成的整体中,部件同整体分离的难易与部件数有关,在部件少的整体当中,部件反而更难同整体分离,部件之间结合得更紧密,当命名部件时,整体更难被忽视。实验二探讨了部件从由不同构字部件组成的汉字整体中分离出来的情况,结果表明:(1)部件同整体分离的难易取 相似文献
987.
An emerging population-based paradigm is now being used to guide the design of preventive trials used to test developmental models. We discuss elements of the designs of several ongoing randomized preventive trials involving reduction of risk for children of divorce, for children who exhibit behavioral or learning problems, and for children whose parents are being treated for depression. To test developmental models using this paradigm, we introduce three classes of design issues: design for prerandomization, design for intervention, and design for postintervention. For each of these areas, we present quantitative results from power calculations. Both scientific and cost implications of these power calculations are discussed in terms of variation among subjects on preintervention measures, unit of intervention, assignment, balancing, number of pretest and posttest measures, and the examination of moderation effects. 相似文献
988.
We investigated exploratory eye movements to thematic pictures in schizophrenic, attention-deficit/hyperactivity disorder (ADHD), and normal children. For each picture, children were asked three questions varying in amount of structure. We tested if schizophrenic children would stare or scan extensively and if their scan patterns were differentially affected by the question. Time spent viewing relevant and irrelevant regions, fixation duration (an estimate of processing rate), and distance between fixations (an estimate of breadth of attention) were measured. ADHD children showed a trend toward shorter fixations than normals on the question requiring the most detailed analysis. Schizophrenic children looked at fewer relevant, but not more irrelevant, regions than normals. They showed a tendency to stare more when asked to decide what was happening but not when asked to attend to specific regions. Thus, lower levels of visual attention (e.g., basic control of eye movements) were intact in schizophrenic children. In contrast, they had difficulty with top-down control of selective attention in the service of self-guided behavior. 相似文献
989.
There is a wealth of advice offered by ‘experts’ in HRM concerning the content of the effective job advertisement. This study considers whether following such advice would provide the potential job applicant with the information they want and questions the extent to which employers actually heed this advice. It firstly compares the normative guidelines with what potential applicants' for managerial posts consider to be important. A second strand to the analysis examines the extent to which advertising practice mirrors the requirements of the job-seeker market. The results give some solace to recruiters but also demonstrates that there is a long way to go before job advertisements achieve the content that job-seekers require. 相似文献
990.
Frank M. Gresham Donald L. MacMillan Kathleen M. Bocian Sharon L. Ward Steven R. Forness 《Journal of abnormal child psychology》1998,26(5):393-406
Children showing a comorbid behavior pattern of hyperactivity-impulsivity-inattention and conduct problems (HIA + CP) were contrasted to children having only an internalizing and externalizing behavior pattern (I + E) and matched controls. Children displaying the HIA + CP behavior pattern were at greater risk on a number of outcome measures in social and academic domains beginning in Grade 3 and continuing into Grade 4. The most marked differences among the three groups were found on peer measures of rejection and friendship and teacher ratings of social skills. On average, almost two-thirds of the HIA + CP group were rejected by their peers compared to one-third of the I + E group and only 12.5% controls. Over 70% of the HIA + CP group had no reciprocated friendships from Grade 3 to Grade 4 compared to less than half of the I + E group and approximately one-fourth of controls. Contrary to much theorizing in the literature, the HIA + CP and I + E groups showed average levels of academic self-concept and did not differ from controls in on measures of social self-concept and academic self-concept and general self-esteem. These findings were interpreted in light of positive illusory biases and the established link between aggressive behavior and egotism. The current article offers partial support for Lynam's (1996) notion of the fledgling psychopath. 相似文献