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   42829篇
  免费   783篇
  国内免费   11篇
  43623篇
  2019年   227篇
  2018年   3762篇
  2017年   3112篇
  2016年   2571篇
  2015年   432篇
  2014年   393篇
  2013年   1751篇
  2012年   1175篇
  2011年   3036篇
  2010年   2896篇
  2009年   1849篇
  2008年   2248篇
  2007年   2727篇
  2006年   555篇
  2005年   680篇
  2004年   626篇
  2003年   515篇
  2002年   519篇
  2001年   760篇
  2000年   796篇
  1999年   569篇
  1998年   281篇
  1997年   234篇
  1996年   217篇
  1992年   448篇
  1991年   410篇
  1990年   449篇
  1989年   415篇
  1988年   397篇
  1987年   403篇
  1986年   405篇
  1985年   423篇
  1984年   335篇
  1983年   299篇
  1982年   237篇
  1981年   213篇
  1979年   389篇
  1978年   279篇
  1977年   251篇
  1976年   226篇
  1975年   342篇
  1974年   376篇
  1973年   351篇
  1972年   330篇
  1971年   287篇
  1970年   260篇
  1969年   322篇
  1968年   358篇
  1967年   321篇
  1966年   325篇
排序方式: 共有10000条查询结果,搜索用时 7 毫秒
991.
The “factor” analyses published by Schultz, Kaye, and Hoyer (1980) confused component and factor analysis and led in this case as in many others to unwarranted conclusions. They used component analysis to develop factor models that were subjected to restricted (confirmatory) maximum likelihood analysis, but the final models for which good fits with the observed correlations were obtained were not common factor models. They were, however, discussed as such and conclusions drawn accordingly. When their correlation matrices are analyzed by the principal factors method, two factors are sufficient to account for the intercorrelations. These two factors generally support the a priori expectation of a difference between intelligence tasks and spontaneous flexibility tasks. They are also quite similar in younger and older subjects, when similarity is judged in terms of factor pattern. Factor loadings for the younger subjects, however, are much smaller than expectations based on the respective ranges of talent in the two groups of subjects or on past experience with similar tests in undergraduate student populations.  相似文献   
992.
The practical utility of cognitive self-instruction training in facilitating the work habits and academic performance of impulsive first-graders was assessed in the context of the regular classroom. The training paradigm was modified and environmental conditions were arranged to facilitate the transfer of the cognitive self-instruction strategy to the classroom. Following training, there were no significant increases in on-task behavior or in academic performance within the context of a group design. On the basis of this and other studies, a drastic revision of the cognitive self-instruction paradigm seems indicated. Not only must training become broader based, but models must be developed that take into account the requisite cognitive processes for task completion as well as the cognitive abilities of the youngsters to whom training is addressed. In general, the incorporation of information from the developmental and cognitive process literature would appear to facilitate the development of more effective training models.  相似文献   
993.
A 39-year-old female suffered bitemporal infarctions and exhibited an unusual behavioral syndrome of muteness and impaired auditory comprehension, with milder aphasic deficits in reading and writing. The anatomic basis of this modality-selective communication disorder appeared to involve both peripheral perceptual and motor as well as “central” language mechanisms. The patient's ability to communicate was greatly aided by instruction in Amerind and Ameslan Sign Language, in which she learned more than 100 signs. Patients whose acquired language deficits spare modalities of input or output may be ideal candidates for sign language therapy.  相似文献   
994.
The scores of 33 subjects of the neuroticism scale of the Eysenck Personality Questionnaire correlated more highly with mood levels averaged over the 12 occasions studied than, on average, with mood scores on single occasions, and more highly with mood described in global terms than with scores on each of the original 18 mood scales. Subjects with high neuroticism scores had poorer mood on average and showed greater variation in mood pattern from one occasion to another than did more stable subjects. It is suggested that forms of relatively poor mood may be more varied than forms of good mood, and that, although neuroticism makes a poor mood more likely, the precise composition of this mood on any occasion may be determined by the combination of situation characteristics and person variables. Psychoticism scores correlated significantly, though weakly, with the average scores for some mood scales independently of neuroticism.  相似文献   
995.
996.
The present investigation of adolescent and young adult women's reasoning, and decision-making about abortion was conducted to determine whether reasoning about abortion could be described by moral, social-conventional, and personal concepts and to examine relationships between domain of reasoning and action choices. Seventy single women, ranging in age from 13 to 31 and divided between 25 women having abortions, 23 women continuing their pregnancies, and 22 never-pregnant women, were administered a semi-structured clinical interview about abortion and two hypothetical moral judgement dilemmas. A classification task was developed to provide an additional measure of reasoning in different domains. Another 29 single, first-pregnant women provided a comparison of the effects of these procedures on decision-making. Content analysis of the protocols revealed that responses to the abortion interview could be reliably distinguished between concepts of morality and personal issues and their coordination or lack of coordination. Subjects treating abortion as a moral issue were more likely to continue their pregnancies while subjects treating abortion as a personal issue were more likely to obtain an abortion. Differences in reasoning between pregnant and nonpregnant subjects were not observed. Moral responses to the abortion interview were found to be highly related to hypothetical moral judgments.  相似文献   
997.
Summary Familiarity effects in visual letter processing were examined by means of a mutilation detection task. The uppercase E was used as the non-mutilated letter. One or two horizontal bars of the E were delected, to produce an upright or inverted F or L. These four mutilations of the E were assigned to the same response. In Experiment 1, brief exposure of the stimuli was followed by a backward mask. Experiment 2 was identical to Experiment 1, except that the display duration of the stimulus was increased and the backward mask was omitted. In Experiment 3, the overall luminance of the stimuli (luminance per point times length of the constituent line segments) was held constant. In Experiment 4, the upright and inverted non-E letter occurred in different blocks to encourage a normal (upright) letter processing strategy in the upright letter blocks. Accuracy (Experiment 1) and mean correct response times (all experiments) were not different for the upright and inverted F or for the upright and inverted L. These findings and converging results from other studies indicate that the higher familiarity of the upright letters did not aid feature extraction.  相似文献   
998.
Thirty-two adult volunteers were asked to memorize a simplified geographical map, visually displayed, together with an auditorially presented 19-item set of instructions regarding a particular route. During this session, half the subjects were sober and half were under the effects of a moderate dose of alcohol (mean blood alcohol concentration = 81mg/100ml). Twenty-four hours later they were tested under the same or different conditions. Learning performance on Day 1 was unaffected by alcohol. Learning transfer (tested on Day 2) was equally good when subjects were intoxicated during both sessions or were sober during both sessions. There were significant decrements in recall on Day 2, when subjects were in a different drug state. This ‘dissociation of learning’ was found to be symmetrical in that the recall decrement was the same whether the initial learning was acquired in a sober or a drugged state.  相似文献   
999.
The perception of the general social standing of husbands and wives in dual-work families as a function of their respective achieved and derived occupational statuses was examined experimentally. The results indicated that both the wife's and husband's general social status was a function only of the husband's occupational status; the wife's occupational status had no effect on either her general social status or that of her husband. The one exception to this was the case of the high achieved occupational status wife depressing the social status of the low occupational status husband. The results are discussed in terms of their implications for recent critiques of male-determined stratification models.  相似文献   
1000.
This research attempted to establish relationships between locus of control, self-esteem, and traditional-nontraditional behavior. It was hypothesized that (1) women tending toward internality and high self-esteem should be more likely to manifest nontraditional behaviors, as evidenced through career-oriented roles, and to rank these roles as their primary source of satisfaction; and (2) women tending toward externality and low self-esteem should be more likely to manifest traditional behavior, as evidenced through family-oriented roles, and to rank these roles as their primary source of satisfaction. The sample consisted of 91 White females in a southern metropolitan area. The data were collected using a survey design. As expected, high self-esteem internals were more likely to manifest nontraditional behavior. Contrary to expectation, low self-esteem externals were more nontraditional in role orientation.  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