全文获取类型
收费全文 | 3037篇 |
免费 | 47篇 |
国内免费 | 2篇 |
专业分类
教育 | 2279篇 |
科学研究 | 145篇 |
各国文化 | 50篇 |
体育 | 251篇 |
文化理论 | 36篇 |
信息传播 | 325篇 |
出版年
2022年 | 21篇 |
2021年 | 25篇 |
2020年 | 43篇 |
2019年 | 84篇 |
2018年 | 90篇 |
2017年 | 99篇 |
2016年 | 90篇 |
2015年 | 53篇 |
2014年 | 91篇 |
2013年 | 763篇 |
2012年 | 67篇 |
2011年 | 67篇 |
2010年 | 60篇 |
2009年 | 62篇 |
2008年 | 77篇 |
2007年 | 68篇 |
2006年 | 54篇 |
2005年 | 56篇 |
2004年 | 53篇 |
2003年 | 65篇 |
2002年 | 50篇 |
2001年 | 58篇 |
2000年 | 62篇 |
1999年 | 43篇 |
1998年 | 30篇 |
1997年 | 23篇 |
1996年 | 26篇 |
1995年 | 26篇 |
1994年 | 27篇 |
1993年 | 38篇 |
1992年 | 40篇 |
1991年 | 38篇 |
1990年 | 35篇 |
1989年 | 34篇 |
1988年 | 31篇 |
1987年 | 30篇 |
1986年 | 23篇 |
1985年 | 36篇 |
1984年 | 29篇 |
1983年 | 20篇 |
1982年 | 38篇 |
1981年 | 34篇 |
1980年 | 24篇 |
1979年 | 28篇 |
1978年 | 34篇 |
1977年 | 18篇 |
1976年 | 21篇 |
1975年 | 13篇 |
1974年 | 14篇 |
1968年 | 13篇 |
排序方式: 共有3086条查询结果,搜索用时 31 毫秒
61.
Jack Edward Sherman 《Learning & behavior》1978,6(4):463-468
Two experiments with rat subjects in a conditioned punishment paradigm are reported. These experiments attempted to determine if the events entering into association with the CS following conditioning with informative (forward) and noninformative (simultaneous) CSs were comparable. In Experiment 1, exposure to intense shock alone following trace (ISI = 10 sec) conditioning with moderate shock enhanced the suppressive effects of a 2-sec CS. A similar manipulation following explicitly unpaired CS-US presentations (ISI = 2 min) had no effect. These data were taken as evidence that the CS and US were associated during trace conditioning. Experiment 2 showed that exposure to intense shock following simultaneous conditioning also enhanced suppression to the CS. These results suggested that simultaneous and forward conditioning procedures yield similar forms of associative learning. 相似文献
62.
Jack Demaine 《British Journal of Sociology of Education》1993,14(4):409-414
The paper begins with a brief reference of some of the inaccuracies in accounts of the so called ‘Honeyford affair’. The main purpose of the paper, however, is not to compare differing accounts, but rather to examine aspects of Honejford's discourse in its own terms. These aspects include his notion of ‘racism’, his concern with ‘tolerance and coherence’ and his account of what he refers to as ‘the human character’. 相似文献
63.
Expanding and diversifying the STEM (science, technology, engineering, and mathematics) workforce is a national priority. The National Science Foundation is investing efforts at post secondary education institutions to engage individuals who have been historically underrepresented in STEM. This paper investigated the use of strategies to broaden participation in STEM by grantees of NSF’s Advanced Technological Education (ATE), who are primarily located at 2-year colleges. The ATE program focuses on developing and improving technician training programs to prepare students for employment in fields that rely on advanced technologiessuch as nanotechnology, photonics, and mechatronics. A survey, conducted annually by the authors of this study, was used to collect data from ATE grantees on their use and perceptions of strategies to broaden participation in STEM. The findings showed that strategies related to motivation and access to enhance recruitment are more widely used then strategies that improve retention. Respondents identified strategies related to providing financial assistance, mentoring, and conducting outreach activities as the most effective for reaching and engaging underrepresented minority students in academic programs. Despite these perceptions, these strategies seem to be underutilized among this group. 相似文献
64.
The goals of this research were to explore the current literature regarding associations between psychological stress and adverse fetal outcome, associations between aerobic exercise and psychological stress reduction, and associations between aerobic exercise and fetal outcome. The published studies that were located provide evidence of the following: 1) Stress reactivity increases physiologically during pregnancy, 2) pregnant women may experience additional stressors that are usually not experienced in a nonpregnant state, 3) psychological stress in pregnancy is associated with adverse fetal outcome, 4) exercise can be a method of stress reduction, 5) exercise in pregnancy is not associated with adverse fetal outcome, and 6) exercise in pregnancy may provide benefit to the fetus. Data were analyzed from an original study and associations were reported between psychological stress-management activities and participation in aquatic aerobic exercise classes. No reports were available investigating an exercise-induced reduction in psychological stress with fetal outcome. 相似文献
65.
The primary purpose of this research was to examine the construct validity of the Child Abuse Potential Inventory by comparing maltreating and high-risk parents' CAP Inventory abuse scores to their behavior during interactions with their children. A second purpose was to determine the degree to which CAP Inventory scores and parenting behavior were related to several known correlates of abuse, as measured by parent and teacher reports. Participants (n = 41) included abusive and high-risk parents and their children referred to a treatment group. Correlational analyses revealed that CAP Inventory scores and observed parenting style yielded highly related findings, supporting construct validity of the CAP Inventory. However, the CAP Inventory and observed behavior index showed a different pattern of relationships to the risk correlates. Implications for assessment of risk status are discussed and recommendations are provided for continued research. 相似文献
66.
Laurice M. Joseph Megan E. McCachran Jack A. Naglieri 《Journal of Research in Reading》2003,26(3):304-314
The purpose of this study was to explore the relationships among cognitive processing, phonological processing and basic reading skill performance. Cognitive theorists propose that Planning, Attention, Simultaneous and Successive (PASS) processes are related to various phonological skills. A sample of 62 Primary Grade children referred for reading problems were administered measures of cognitive processes (Cognitive Assessment System), phonological processes (Comprehensive Test of Phonological Processing) and basic reading achievement (Woodcock‐Johnson Tests of Academic Achievement‐III). Findings indicated that some cognitive processes were significantly related to phonological processes as well as basic reading skills. The strongest relationships were found between phonological memory and successive processes and between phonological awareness and basic reading performance. 相似文献
67.
This paper examines the meaning of context in relation to ontology based query expansion and contains a review of query expansion approaches. The various query expansion approaches include relevance feedback, corpus dependent knowledge models and corpus independent knowledge models. Case studies detailing query expansion using domain-specific and domain-independent ontologies are also included. The penultimate section attempts to synthesise the information obtained from the review and provide success factors in using an ontology for query expansion. Finally the area of further research in applying context from an ontology to query expansion within a newswire domain is described. 相似文献
68.
Jackson R Baird W Davis-Reynolds L Smith C Blackburn S Allsebrook J 《Health information and libraries journal》2007,24(2):95-102
OBJECTIVES: The objectives of this work were to identify the sources of information currently received, information-seeking behaviours, information requirements and preferences for future information provision amongst health and social care professionals providing care to children with health care needs. METHODS: Data were collected using a cross-sectional postal questionnaire survey. RESULTS: A wide range of information resources was reported as being available to professionals. However, a large proportion of respondents found it necessary to perform additional searches for information, suggesting that current resources were not satisfying their needs. The majority of professionals reported a preference for electronic formats, whilst a smaller proportion preferred hard copy materials. Participants promoted the use of informal networks as a means of support and exchange of information. CONCLUSION: Supplementing the information that is provided in electronic and hard copy formats, by enhancing informal networks, may be the most effective way of meeting the information needs of this group of professionals. 相似文献
69.
This longitudinal study of 105 economically disadvantaged children examined the relation between reading problems and internalizing behavior in 3rd- and 5th-grade assessments (8- to 12-year olds). The variable-centered results showed that reading problems predicted change in internalizing behavior in the context of child and family predictors. The person-centered results showed that children with reading problems in both grades had higher internalizing scores in 5th grade but not in 3rd grade than children with reading problems in 3rd grade or no problems. Child-reported negative emotion experiences varied similarly across grade. The results tie reading problems to emotional distress in school and support conclusions about the direction of effects and the internalization of academic difficulty for disadvantaged children. 相似文献
70.