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   38989篇
  免费   445篇
  国内免费   1篇
  39435篇
  2021年   132篇
  2020年   250篇
  2019年   302篇
  2018年   3770篇
  2017年   3199篇
  2016年   2645篇
  2015年   544篇
  2014年   517篇
  2013年   2226篇
  2012年   1285篇
  2011年   3054篇
  2010年   2927篇
  2009年   1912篇
  2008年   2339篇
  2007年   2777篇
  2006年   681篇
  2005年   852篇
  2004年   803篇
  2003年   716篇
  2002年   704篇
  2001年   347篇
  2000年   337篇
  1999年   315篇
  1998年   320篇
  1997年   305篇
  1996年   262篇
  1995年   257篇
  1994年   237篇
  1993年   241篇
  1992年   245篇
  1991年   203篇
  1990年   196篇
  1989年   175篇
  1988年   171篇
  1987年   168篇
  1986年   161篇
  1985年   209篇
  1984年   242篇
  1983年   243篇
  1982年   259篇
  1981年   245篇
  1980年   193篇
  1979年   182篇
  1978年   220篇
  1977年   223篇
  1976年   202篇
  1975年   189篇
  1974年   196篇
  1973年   150篇
  1972年   113篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
121.
There have been continuing concerns about the extent to which maternal depression may influence maternal reports of child behavior. To examine this issue, a series of structural equation models of the relationships between maternal depression and errors in maternal reports of child behavior was proposed and tested. These models assumed that (a) maternal depression was unrelated to maternal reporting behavior; (b) maternal depression causally influenced maternal reporting accuracy; (c) maternal depression was correlated with reporting accuracy. These models were fitted to data on maternal depression and multipleinformant (mother, teacher, child) reports of conduct disorder and attention deficit behaviors for a birth cohort of 12 and 13yearold New Zealand children. The results of model fitting suggested the presence of small to moderate correlations (@#@ r=+.13 to+.40) between maternal depression and maternal reporting errors, indicating the presence of a tendency for increasing maternal depression to be associated with a tendency for mothers to overreport child behavior problems. However, independently of any effects of maternal depression on maternal reporting errors there was evidence of small but significant associations (r=.10 to .17; p<.05)between maternal depression and child conduct disorder and attention deficit behaviors.This research was funded by grants from the Health Research Council of New Zealand.  相似文献   
122.
Memory & Cognition - The use of different types of partial temporal information is shown to affect dating accuracy and the distribution of errors in event dating. Several different types of...  相似文献   
123.
124.
Three cases from a larger review of child abuse inquiry reports are discussed. The abuse the children suffered is termed 'not-existing' because they had been shut away until they perished. Interaction between the children's caretakers and the child protection professionals is examined within a revised framework of the double-bind.  相似文献   
125.
Conceptual complexity is a personality characteristic that involves the individual's ability to differentiate and integrate aspects of information. It is usu ally measured with the Paragraph Completion Test (PCT), which requires the completion of six paragraphs, in response to standard stems, often with a time limit of 100-120 sec each. In order to eliminate time pressure, which may reduce complexity, the current study evaluated a revised format that used only two stems but allowed 8 minutes per response. As expected, this procedure resulted in higher scores and produced enough written output to allow analysis of particular test components. Complexity scores from 277 university students were related to total number of words written, sentence length, and number of words with more than three syllables, but not to standard formulae designed to measure readability, such as the Flesch, SMOG and FOG indices. The modest size of the obtained correlations suggests that the scoring of conceptual complexity on the basis of semantic content cannot be replaced by indices based on linguistic and textual components.  相似文献   
126.
The interrelationships between cigarette, alcohol, and coffee use were examined in 307 U.S. army trainees and 304 U.S. enlisted army personnel. Usage patterns indicated distinct gender differences in this occupational setting. Among women, cigarette use and alcohol consumption were positively correlated; whereas for men, cigarette and coffee use were positively related. For both males and females, alcohol and coffee use were only weakly correlated. As demonstrated in other studies, nonsmokers showed a consistent pattern of abstention from coffee and alcohol or moderate alcohol use.  相似文献   
127.
An overview is presented of a pilot psychoendocrine study of PTSD inpatients in comparison with several subgroups of schizophrenic and affective disorder patients. Using a hormonal profile including Cortisol, norepinephrine, epinephrine, testosterone, and thyroxine, it was found that the mean values for the PTSD group were at or near the extreme end of the range for every hormone measured, i.e., relatively low for Cortisol and high for the remaining hormones. The possible clinical meaning of these findings is considered in the light of prior psychoendocrine research on chronic stress. The hormonal alterations in PTSD appear to be persistent and suggest the possibility of being linked largely to traits or character structure, perhaps particularly to cognitive variables related to defense and coping mechanisms, as reviewed in detail for each hormonal system. There appears to be a potential for a fruitful union between the traumatic stress and psychoendocrine fields and some future strategies for developing and strengthening such a union are suggested.  相似文献   
128.
The concept of a universal human nature, based on a species-typical collection of complex psychological adaptations, is defended as valid, despite the existence of substantial genetic variation that makes each human genetically and biochemically unique. These apparently contradictory facts can be reconciled by considering that (a) complex adaptations necessarily require many genes to regulate their development, and (b) sexual recombination makes it improbable that all the necessary genes for a complex adaptation would be together at once in the same individual, if genes coding for complex adaptations varied substantially between individuals. Selection, interacting with sexual recombination, tends to impose relative uniformity at the functional level in complex adaptive designs, suggesting that most heritable psychological differences are not themselves likely to be complex psychological adaptations. Instead, they are mostly evolutionary by-products, such as concomitants of parasite-driven selection for biochemical individuality. An evolutionary approach to psychological variation reconceptualizes traits as either the output of species-typical, adaptively designed development and psychological mechanisms, or as the result of genetic noise creating perturbations in these mechanisms.  相似文献   
129.
Glover  John A.  Krug  Damon  Hannon  Shawn  Shine  Agnes 《The Psychological record》1990,40(2):215-226

Four experiments examined two alternative views of retrieval events. The results of Experiment 1 were equivocal because of an apparent “ceiling effect.” The results of Experiments 2, 3, and 4, in which changes were made in basic procedures, seemed to indicate that the act of retrieval itself had an effect on the memorability of words.

  相似文献   
130.
The essay examines the argument advanced by E.D. Hirsch, Jr., for instituting ‘cultural literacy’ as a fundamental priority of schools. A number of confusions and equivocations in Hirsch's reasoning are identified, and the propensity of his project to indoctrinate is exposed. Among the features of Hirsch's argument shown to be troubling are his shifting construal of ‘language’, his inconsistency about the requirements of cultural literacy, and his uncritical relation to traditional images of the American past and present. The upshot is to raise the question why Hirsch's project has elicited wide support and praise.  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