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   36595篇
  免费   804篇
  国内免费   15篇
  37414篇
  2021年   132篇
  2020年   225篇
  2019年   241篇
  2018年   3730篇
  2017年   3078篇
  2016年   2532篇
  2015年   464篇
  2014年   375篇
  2013年   1373篇
  2012年   1106篇
  2011年   2950篇
  2010年   2809篇
  2009年   1774篇
  2008年   2121篇
  2007年   2565篇
  2006年   412篇
  2005年   538篇
  2004年   497篇
  2003年   423篇
  2002年   379篇
  2001年   728篇
  2000年   748篇
  1999年   475篇
  1998年   199篇
  1997年   189篇
  1996年   144篇
  1995年   135篇
  1993年   138篇
  1992年   360篇
  1991年   322篇
  1990年   352篇
  1989年   334篇
  1988年   317篇
  1987年   288篇
  1986年   310篇
  1985年   298篇
  1984年   235篇
  1983年   200篇
  1979年   190篇
  1978年   161篇
  1975年   187篇
  1974年   241篇
  1973年   197篇
  1972年   203篇
  1971年   167篇
  1970年   149篇
  1969年   199篇
  1968年   202篇
  1967年   161篇
  1966年   182篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
An interaction of word frequency and word regularity has typically been observed in naming and lexical decision experiments in which, in addition to an overall effect of word frequency, responses to low-frequency exception words are slower than those to low-frequency regular words, while no such difference occurs with high-frequency words. The only eye movement study to examine this effect in reading (Inhoff & Topolski, 1994) reported only transient effects of regularity. In the present experiment, we examined the frequency x regularity interaction using different stimuli than those of Inhoff and Topolski and also varied the parafoveal preview of the target word prior to fixation. When the preview was valid, the frequency x regularity interaction appeared. However, with an invalid preview, the effect of regularity disappeared. The results suggest that the activation of phonological codes is a very early component of reading.  相似文献   
992.
This study assessed what motor skill tests were appropriate by observing 636 young children's behavior in daily life (low-aged classes, M = 3.7 yr.; middle-aged classes, M = 4.7 yr.; high-aged classes, M = 5.7 yr.). A homeroom teacher and an assistant teacher estimated motor achievement as pass-or-fail, and then judged pass-or-fail based on practical testing. Estimate-re-estimate agreement, interrater agreement, and agreement between estimated values and measured values were examined for 27 items, e.g., skipping, bouncing a ball, and turning on one leg. Estimate-re-estimate agreement was high on the whole. Interrater agreement ranged from 34% to 100% for 3-yr.-olds, 21% to 100% for 4-yr.-olds, and 89% to 100% for 5-yr.-olds. Agreement between estimated values and measured values greater than 80% was found in most items for 5-yr.olds (14 items). After examining the above-mentioned agreements, 26 items were selected as possible tests to judge motor development, using a pass-or-fail, from the observation of young children's behavior in daily life.  相似文献   
993.
A national survey of specialist school psychologists examined the perceived usefulness of assessment techniques in making decisions regarding eligibility for the educational classification of emotional disturbance and in generating classroom recommendations. Analysis showed measures rated as most useful were interviews with the parent, teacher, and student, observations of the student, and norm-referenced rating scales. Projective techniques were least useful. These findings are important in the context of "best practices" for the multidimensional assessment of emotional disturbance which promotes a more direct link between assessment and intervention.  相似文献   
994.
The present study investigated the readiness potential (RP) preceding a brisk extension of the right middle finger during different arousal states as monitored by skin potential level (SPL). The late component of the readiness potential in the medium arousal state was significantly larger than those in the low and high arousal states. This finding indicates that the RP waveform may vary as a function of arousal states, suggesting the inverse U-shaped relationship proposed in studies of the contingent negative variation.  相似文献   
995.
Relations of individuals' value priorities to their worries are investigated in seven samples from four cultural groups (N = 1,441). A social-cognitive analysis suggests that value priorities influence worries by increasing attention to and perception of threats to valued goals. On this basis, we generate hypotheses relating two types of worries, micro (about self and its extensions) and macro (about society and world), to 10 types of values. As predicted, giving priority to self-transcendence values (universalism and benevolence) is associated with low micro and high macro worry, whereas giving priority to self-enhancement values (power, hedonism, and--to a lesser degree--achievement) is associated with high micro and low macro worry. Meaningful associations are also found for other values. Values account for substantially more variance in macro than in micro worries.  相似文献   
996.
A meta-analysis of 28 studies examined support for the Theory of Cooperation and Competition (M. Deutsch, 1973) and Dual Concern Theory (D. G. Pruitt & J. Z. Rubin, 1986). Effects of social motive (prosocial vs. egoistic) and resistance to yielding (high vs. low vs. unknown) on contenting, problem solving, and joint outcomes were examined. Consistent with Dual Concern Theory, results showed that negotiators were less contentious, engaged in more problem solving, and achieved higher joint outcomes when they had a prosocial rather than egoistic motive, but only when resistance to yielding was high (or unknown) rather than low. The authors also explored the moderating effects of study characteristics and found effects for participation inducement (class exercise, participant pool), for publication status, and for treatment of no-agreement dyads.  相似文献   
997.
Children 2, 2 1/2, and 3 years of age engaged in a search task in which they opened 1 of 4 doors in an occluder to retrieve a ball that had been rolled behind the occluder. The correct door was determined by a partially visible wall placed behind the occluder that stopped the motion of the unseen ball. Only the oldest group of children was able to reliably choose the correct door. All children were able to retrieve a toy that had been hidden in the same apparatus if the toy was hidden from the front by opening a door. Analysis of the younger children's errors indicated that they did not search randomly but instead used a variety of strategies. The results are consistent with the Piagetian view that the ability to use representations to guide action develops slowly over the first years of life.  相似文献   
998.
Self-efficacy has been shown to be related to outcomes from interventions for alcohol and tobacco abuse but relatively little attention has been focused on it in evaluations of treatment for illicit drug abuse. Almost no research has examined offenders involved with drugs. The current study, therefore, adapted the Alcohol Abstinence Self-efficacy Scale of DiClemente, Carbonari, Montgomery, and Hughes and administered it to 250 probationers mandated to 6 months of residential treatment. With some modifications, confirmatory factory models replicated four previously reported dimensions, e.g., Negative Affect, Social/Positive, Physical and Other Concerns, Cravings and Urges. Findings also indicated high construct validity for the Alcohol Abstinence Self-efficacy Scale as adapted here. Studies are needed to examine the use of self-efficacy as a prospective measure of treatment progress and to explore its association with outcomes from corrections-based treatment.  相似文献   
999.
In the current edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV; American Psychiatric Association, (1994) Diagnostic and statistical manual of mental disorders (4th ed.) Washington, DC: author) phobic adults and adolescents are said to "recognize that the phobia is excessive or unreasonable" given the actual danger posed by the feared situation. The present study examined perceptions of danger in 15 spider phobic subjects and a matched set of controls before, during and after a spider-avoidance test. When detached from the phobic stimulus, phobic subjects: (1) gave higher estimates of the probability of being bitten than controls did; (2) gave higher estimates of the injuries that would result from being bitten and (3) in line with these first two findings, believed their high levels of anticipated anxiety were more reasonable and appropriate to the demands of the situation than controls did. These findings are inconsistent with the prevailing notion that when detached from the phobic situation patients can accurately evaluate the danger of potential phobic encounters. Instead, the findings suggest that phobic individuals, whether detached or in the presence of the feared object, have relatively limited insight into the irrationality of their fears. In examining the mediation of phobic phenomena, both self-efficacy and danger estimates remained significantly related to the anxiety and avoidance experienced in the spider-avoidance task. Further research designed to experimentally establish the likely causal roles of these two constructs is warranted.  相似文献   
1000.
Previous studies have found that subjects diagnosed with verbal auditory agnosia (VAA) from bilateral brain lesions may experience difficulties at the prephonemic level of acoustic processing. In this case study, we administered a series of speech and nonspeech discrimination tests to an individual with unilateral VAA as a result of left-temporal-lobe damage. The results indicated that the subject's ability to perceive steady-state acoustic stimuli was relatively intact but his ability to perceive dynamic stimuli was drastically reduced. We conclude that this particular aspect of acoustic processing may be a major contributing factor that disables speech perception in subjects with unilateral VAA.  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