全文获取类型
收费全文 | 29158篇 |
免费 | 368篇 |
国内免费 | 60篇 |
专业分类
教育 | 21421篇 |
科学研究 | 2279篇 |
各国文化 | 247篇 |
体育 | 2126篇 |
综合类 | 50篇 |
文化理论 | 161篇 |
信息传播 | 3302篇 |
出版年
2021年 | 274篇 |
2020年 | 360篇 |
2019年 | 577篇 |
2018年 | 808篇 |
2017年 | 852篇 |
2016年 | 786篇 |
2015年 | 493篇 |
2014年 | 684篇 |
2013年 | 5694篇 |
2012年 | 709篇 |
2011年 | 788篇 |
2010年 | 608篇 |
2009年 | 576篇 |
2008年 | 701篇 |
2007年 | 590篇 |
2006年 | 679篇 |
2005年 | 533篇 |
2004年 | 411篇 |
2003年 | 403篇 |
2002年 | 416篇 |
2001年 | 633篇 |
2000年 | 527篇 |
1999年 | 479篇 |
1998年 | 277篇 |
1997年 | 295篇 |
1996年 | 315篇 |
1995年 | 305篇 |
1994年 | 270篇 |
1993年 | 284篇 |
1992年 | 412篇 |
1991年 | 387篇 |
1990年 | 407篇 |
1989年 | 413篇 |
1988年 | 386篇 |
1987年 | 359篇 |
1986年 | 365篇 |
1985年 | 365篇 |
1984年 | 354篇 |
1983年 | 384篇 |
1982年 | 294篇 |
1981年 | 279篇 |
1980年 | 274篇 |
1979年 | 401篇 |
1978年 | 319篇 |
1977年 | 265篇 |
1976年 | 254篇 |
1975年 | 229篇 |
1974年 | 209篇 |
1973年 | 211篇 |
1971年 | 207篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
951.
Depressed mothers' judgments about their children: an examination of the depression-distortion hypothesis 总被引:5,自引:0,他引:5
The belief that depressed mothers have distorted perceptions of their children's problems has gained considerable currency in recent years. The empirical basis for this belief at present amounts to little more than reliable demonstrations that depressed mothers tend to report more behavior problems in their children than do nondepressed mothers. An obvious alternative to the distortion interpretation is that depressed mothers are accurate about their children's behavior problems. We examined these competing models by comparing teachers' ratings of children with ratings provided by their mothers, who varied on the dimensions of depressed mood, depressed clinical state, and history of depression. Mothers' and teachers' ratings yielded substantially similar portraits of child behavior problems at the group level, with children of in-remission and in-episode mothers manifesting significantly higher levels of behavior problems than children of control mothers. Moreover, agreement between mothers and teachers was in the moderate range for all index groups and did not differ significantly from the mean level of mother-teacher agreement reported by other investigators based on unselected samples. The limitations of these findings and of earlier reports for assessing a depression----distortion influence on mothers' ratings of their children are considered. 相似文献
952.
Genetic and environmental origins of individual differences in masculine and feminine personality attributes were investigated in a sample of 38 monozygotic and 32 dizygotic twin pairs (total N = 140) during pre- and early adolescence. Self-report measures of both masculine and feminine characteristics were obtained for each child using 2 standardized instruments: the Children's Personality Attributes Questionnaire (CPAQ) and the Adolescent Self-Perception Inventory (ASPI). Multivariate biometrical analyses revealed significant genetic influences in all measures, accounting for 20%-48% of the observed variation in each. Environmental influences, which explained the remaining 52%-80% of variance in masculinity and femininity, were apparently specific to each individual and not shared by members of the same twin pair. The results underscore the importance of considering both genetic and environmental factors in gender-role development, particularly in studies of family resemblance. 相似文献
953.
954.
Research has shown a positive relationship between academic engaged time (AET), academic learning time (ALT) and student achievement. Previous work has reported a relatively non‐intrusive, cost‐effective method for increasing AET in the classroom involving the presentation of research information followed by feedback to teachers of students’ AET in their classes. This study aimed to replicate these findings in a primary school setting and to establish what effects the information plus feedback had on teachers’ instructional behaviours which have been found to correlate with students’ AET and ALT. In addition, we looked at the effects of more precise feedback based on students’ task difficulty measures. The results provided strong support for the utility and efficacy of information plus feedback as a method for increasing student AET and ALT and for enabling teachers to change their instructional behaviours in the direction of published research findings. 相似文献
955.
To determine if neuropsychological deficits, known to precede alcohol use in those genetically predisposed to alcoholism, were present in an alcoholic population, 25 male alcoholics (mean age 41.1) were interviewed concerning alcohol usage, educational difficulties in elementary school, and family history of alcoholism. Using a regression table, discrepancies between current IQ on the Wechsler Adult Intelligence Scale-Revised (WAIS-R) (Wechsler, 1981) and achievement on the Woodcock-Johnson Psycho-Educational Battery (WJB) (Woodcock & Johnson, 1977) were calculated to determine present learning status. Forty percent of the alcoholics were found to have had special education, remedial services, or repeated grade failure concurrent with a familial history of alcoholism and current discrepancies indicative of learning disability. There were no significant differences on intelligence, years of drinking, or mean grades completed in school between this group and the rest of the subjects who did not receive services in school. Conclusions were that childhood learning disorders may be related to the development of alcoholism, particularly when alcoholism is in the family, and that special educators have a role to play in the prevention and treatment of alcoholism. 相似文献
956.
Developing guidelines for HIV antibody testing among victims of pediatric sexual abuse 总被引:1,自引:0,他引:1
The incidence of human immunodeficiency virus (HIV) infection acquired by children through sexual abuse is presently unknown. A telephone survey of 63 practitioners of pediatric sexual abuse (PSA) assessment in the five U.S. regions with highest prevalence of HIV infection was conducted to determine the present status of guidelines for HIV antibody testing of PSA victims. No formal protocol was used by any of those surveyed, and a literature review found no existing guidelines for HIV antibody testing of PSA victims. A standard set of clinical situations was presented to practitioners to assess whether a consensus exists of indications for HIV antibody testing of abused children. Seven clinical profiles with 12 criteria were presented including HIV antibody status, AIDS/ARC clinical profile, and behavioral profile of the assailant; clinical profile of the victim; pre-assault victim behavioral profile compatible with high risk of HIV infection (exclusively adolescents); parent/guardian anxiety/psychosocial profile; and profile of the assaultive act with respect to potential transmissibility of HIV. We found an 85% or greater consensus for 6 testing criteria, and based upon these propose an interim set of HIV antibody testing guidelines for PSA victims. There was no consensus about five testing criteria, but their frequent citation merits further consideration. Clinical application of interim guidelines and design of prospective studies to quantitatively evaluate them are reviewed. 相似文献
957.
A conceptual overview of the regression discrepancy model for evaluating severe discrepancy between IQ and achievement scores 总被引:1,自引:0,他引:1
L D Evans 《Journal of learning disabilities》1990,23(7):406-412
A conceptual overview of the Regression Discrepancy Model (RDM) for determining severe discrepancy between IQ and achievement scores is presented in order to enhance understanding of the model without the use of the complex mathematical equations that constitute the model. The six specific goals of the RDM are identified, and figures illustrate the manner in which the model accomplishes each goal. Figures are also provided from a RDM computer output showing the basic outcomes of the model. Advantages and disadvantages of the RDM are discussed to further promote understanding of the model. 相似文献
958.
Michael D. Piburn 《科学教学研究杂志》1990,27(9):887-900
Students display a number of misconceptions when asked to reason about logical propositions. Rather than being random, these misconceptions are stereotypic, and relate to age, ability, and success in science. The grades in science achieved by tenth-grade general science students from two parochial single-sex schools in Australia correlated with their scores on the Propositional Logic Test. The students' ability level was consistently related to the pattern of errors they committed on that measure. Mean scores were lowest on a subtest of ability to use the biconditional and implication, higher on the disjunction, and highest on the conjunction. Success in science was predicted most strongly by the disjunction and biconditional subtests. Knowledge of the way in which a person reasons about logical propositions provides additional insights into the transformations information is subjected to as it is integrated into mental schemata. 相似文献
959.
960.