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   392篇
  免费   16篇
  2023年   3篇
  2022年   2篇
  2021年   7篇
  2020年   7篇
  2019年   11篇
  2018年   13篇
  2017年   15篇
  2016年   14篇
  2015年   17篇
  2014年   16篇
  2013年   33篇
  2012年   16篇
  2011年   25篇
  2010年   13篇
  2009年   15篇
  2008年   27篇
  2007年   24篇
  2006年   23篇
  2005年   20篇
  2004年   20篇
  2003年   17篇
  2002年   23篇
  2001年   5篇
  2000年   3篇
  1999年   7篇
  1998年   7篇
  1996年   5篇
  1995年   3篇
  1994年   2篇
  1993年   3篇
  1990年   1篇
  1989年   1篇
  1988年   2篇
  1986年   3篇
  1982年   1篇
  1981年   1篇
  1978年   1篇
  1977年   1篇
  1976年   1篇
排序方式: 共有408条查询结果,搜索用时 15 毫秒
101.
Abstract

Some societies tolerate or encourage high levels of chickenpox infection among children to reduce rates of shingles among older adults. This tradeoff is unethical. The varicella zoster virus (VZV) causes both chickenpox and shingles. After people recover from chickenpox, VZV remains in their nerve cells. If their immune systems become unable to suppress the virus, they develop shingles. According to the Exogenous Boosting Hypothesis (EBH), a person’s ability to keep VZV suppressed can be ‘boosted’ through exposure to active chickenpox infections. We argue that even if this hypothesis were true, immunization policies that discourage routine childhood varicella vaccination in order to prevent shingles for other people are unethical. Such policies harm children and treat them as mere means for the benefit of others, and are inconsistent with how parents should treat their children and physicians should treat their patients. These policies also seem incompatible with institutional transparency.  相似文献   
102.
This study evaluated the internal consistency of a Spanish version of the short form of the Francis Scale of Attitude Toward Christianity based on responses of 405 Colombian adolescent students ages 13 to 17 years. This translated short-form version of the scale had an internal consistency of .80. This estimate indicates suitable internal consistency reliability for research use in this population.  相似文献   
103.
An earlier training model emphasized systematic feedback on accuracy of concepts contained in student assessment reports prepared with common data sets from standard tests. This feedback resulted in consistent increments in concept agreements between reports prepared by students and more experienced assessors. This model was applied in courses with multicultural students by contrasting standard and multicultural assessment and using data sets from multicultural assessees. These students experienced greater difficulty in demonstrating consistent increments of agreement in report concepts due to uneven knowledge of specific cultures, inapplicability of available norms, and interpretation issues. The effectiveness of combining standard and multicultural training should be compared with conventional standard training followed by culturally focused specialized assessment courses.  相似文献   
104.
105.
This study examined how children use word order and animacy cues to determine the agent of the action in an on-line sentence-comprehension task. The subject group included 15 children, 5-12 years old, with brain injury incurred prior to the age of 2 months; 12 had left hemisphere (LH) damage and 3 had right hemisphere (RH) damage. The comparison group included 141 children, 5-10 years old, who were at the appropriate grade for age. The task required children to listen to sentences composed of two noun phrases (N) that varied in terms of animacy and a verb phrase (V) and then to indicate the agent of the action. Three word orders were presented: NVN, VNN, and NNV. Measures included the proportion of trials in which the first noun was selected (choice) and reaction time. Word order and animacy significantly influenced choice. The effect of subject group approached significance for choice. Word order and age influenced reaction time. The children with LH injury and two children with RH injury showed a developmental delay in choosing the appropriate N as agent; one child with RH injury had mature responses. The overlapping performance of children with LH and RH injury suggests that delays in the development of sentence comprehension strategies are more likely related to reliance on a smaller than usual neural network rather than to congenital specialization of the LH.  相似文献   
106.
The goal of this research was to examine mechanisms underlying early induction--specifically, the relation between induction and categorization. Some researchers argue that even early in development, induction is based on category-membership information, whereas others argue that early induction is based primarily on similarity. Children 4 and 5 years of age participated in two types of tasks: categorization and induction. Both tasks were performed with artificial animal-like categories in which appearance was pitted against category membership. Although the children readily acquired category-membership information and subsequently used this information in categorization tasks, they ignored category membership during the induction task, relying instead on the appearance of items. These results support the idea that early in development, induction is similarity based.  相似文献   
107.
Lyn H 《Animal cognition》2007,10(4):461-475
Error analysis has been used in humans to detect implicit representations and categories in language use. The present study utilizes the same technique to report on mental representations and categories in symbol use from two bonobos (Pan paniscus). These bonobos have been shown in published reports to comprehend English at the level of a two-and-a-half year old child and to use a keyboard with over 200 visuographic symbols (lexigrams). In this study, vocabulary test errors from over 10 years of data revealed auditory, visual, and spatio-temporal generalizations (errors were more likely items that looked like sounded like, or were frequently associated with the sample item in space or in time), as well as hierarchical and conceptual categorizations. These error data, like those of humans, are a result of spontaneous responding rather than specific training and do not solely depend upon the sample mode (e.g. auditory similarity errors are not universally more frequent with an English sample, nor were visual similarity errors universally more frequent with a photograph sample). However, unlike humans, these bonobos do not make errors based on syntactical confusions (e.g. confusing semantically unrelated nouns), suggesting that they may not separate syntactical and semantic information. These data suggest that apes spontaneously create a complex, hierarchical, web of representations when exposed to a symbol system. Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.  相似文献   
108.
This study examined the relationship between posttraumatic stress (PTS) symptoms and particular aspects of emotion regulation difficulties among trauma-exposed individuals. Participants were an ethnically diverse sample of 108 undergraduates from an urban university. PTS symptom severity was found to be associated with lack of emotional acceptance, difficulty engaging in goal-directed behavior when upset, impulse-control difficulties, limited access to effective emotion regulation strategies, and lack of emotional clarity. Further, overall difficulties in emotion regulation were associated with PTS symptom severity, controlling for negative affect. Finally, individuals exhibiting PTS symptoms indicative of a PTSD diagnosis reported greater difficulties with emotion regulation than those reporting PTS symptoms at a subthreshold level. The implications of these findings for research and treatment are discussed.  相似文献   
109.
Children with attention-deficit/hyperactivity disorder (ADHD) are at risk for adverse outcomes such as substance abuse and criminality, particularly if they develop conduct problems. Little is known about early predictors of the developmental course of conduct problems among children with ADHD, however. Parental psychopathology and parenting were assessed in 108 children who first met Diagnostic and Statistical Manual of Mental Disorders (4th ed.) criteria for ADHD at 4-7 years old. When demographic variables and baseline ADHD and conduct problems were controlled, maternal depression predicted conduct problems 2-8 years following the initial assessment, whereas positive parenting during the structured parent- child interaction task predicted fewer future conduct problems. These findings suggest that maternal depression is a risk factor, whereas early positive parenting is a protective factor, for the developmental course of conduct problems among children with ADHD.  相似文献   
110.
Medically treated parasuicides in a Norwegian county were monitored for more than 6 years, and variables predicting repetition of the parasuicide were identified. Numerous variables were found to be associated with repetition of the parasuicide when studied retrospectively. In prospective analyses of patients with no history of parasuicide, only sexual abuse (both sexes), alcohol abuse, and report of own psychiatric problems as the main concern at the time of the parasuicide (females only) were significant predictors of repetition. The results indicated that predictors of repetition are highly dependent upon the stage of the “suicidal career” the patients are in.  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