全文获取类型
收费全文 | 4251篇 |
免费 | 94篇 |
国内免费 | 2篇 |
专业分类
教育 | 3296篇 |
科学研究 | 200篇 |
各国文化 | 50篇 |
体育 | 274篇 |
文化理论 | 21篇 |
信息传播 | 506篇 |
出版年
2023年 | 17篇 |
2022年 | 24篇 |
2021年 | 37篇 |
2020年 | 75篇 |
2019年 | 135篇 |
2018年 | 156篇 |
2017年 | 175篇 |
2016年 | 134篇 |
2015年 | 105篇 |
2014年 | 118篇 |
2013年 | 1048篇 |
2012年 | 103篇 |
2011年 | 124篇 |
2010年 | 91篇 |
2009年 | 106篇 |
2008年 | 114篇 |
2007年 | 106篇 |
2006年 | 111篇 |
2005年 | 86篇 |
2004年 | 95篇 |
2003年 | 81篇 |
2002年 | 84篇 |
2001年 | 67篇 |
2000年 | 81篇 |
1999年 | 57篇 |
1998年 | 46篇 |
1997年 | 67篇 |
1996年 | 41篇 |
1995年 | 41篇 |
1994年 | 54篇 |
1993年 | 44篇 |
1992年 | 46篇 |
1991年 | 42篇 |
1990年 | 33篇 |
1989年 | 40篇 |
1988年 | 34篇 |
1987年 | 22篇 |
1986年 | 34篇 |
1985年 | 33篇 |
1984年 | 36篇 |
1983年 | 30篇 |
1981年 | 19篇 |
1980年 | 21篇 |
1979年 | 26篇 |
1978年 | 20篇 |
1977年 | 18篇 |
1976年 | 14篇 |
1974年 | 13篇 |
1973年 | 14篇 |
1966年 | 12篇 |
排序方式: 共有4347条查询结果,搜索用时 671 毫秒
991.
Objectives
This study examined the effects of individual and contextual factors on reentry into out-of-home care among children who were discharged from child protective services in fiscal year 2004-2005. The objectives were to: (1) examine individual and contextual factors associated with reentry, (2) explore whether there are meaningful groups of youth who differ in terms of risk for reentry, and (3) determine whether relatively homogeneous clusters of child welfare agencies, based on contextual characteristics, differ significantly in terms of the reentry rates of the children whom they serve.Method
The study design involved a multilevel longitudinal analysis of administrative data based on an exit cohort. Two Cox proportional hazards multilevel mixture models were tested. The first model included multiple individual level predictors and no agency level predictors. The second model included both levels of predictors.Results
The results of multilevel Cox regression mixture modeling indicated that at the individual level, younger age, being placed in out-of-home care because of neglect and having physical, health problems corresponded to a decreased likelihood for reentry. At the agency level, lower average expenditures per child and contracting out case management services were associated with faster reentry into out-of-home care.Conclusions
This study demonstrates that children who reenter out-of-home care appear to be a homogeneous population and that reentry is associated with both contextual factors and individual characteristics.Practice implications
The most important implication that can be drawn from the study findings is that reentry may be most effectively prevented by focusing on such factors at the organizational level as contracting out case management services and funding allocation. Child welfare agencies that are responsible for an array of services and decide to contract out case management should consider the use of performance-based contracts and emphasize and strengthen quality assurance approaches for contracted services. In addition, to compensate for lower funding allocated for children served in out-of-home care, child welfare workers should become more familiar with community resources and help connect families to these supports. 相似文献992.
Mary A. Silles 《Economics of Education Review》2011,30(2):258-268
This article, using the National Child Development Study, estimates the causal relationship between parents’ schooling and children's cognitive and non-cognitive development using the 1947 compulsory schooling legislation in Great Britain. The least squares estimates suggest strong correlations between parental education and these developmental indicators. However, the instrument variable estimates are not sufficiently precise to find that either parent's schooling has a beneficial effect on children's cognitive and non-cognitive development. 相似文献
993.
994.
Jessica E. Vick Whittaker Brenda Jones HardenHeather M. See Allison D. MeischT’Pring R. Westbrook 《Early childhood research quarterly》2011,26(1):74
Early Head Start children may be more likely to exhibit difficulties with social-emotional functioning due to the high-risk environments in which they live. However, positive parenting may serve as a protective factor against the influence of risk on children's outcomes. The current study examines the effects of contextual and proximal risks on children's social-emotional outcomes and whether these effects are mediated by maternal sensitivity. One-hundred and fourteen low-income, high-risk mother-toddler dyads participated in this longitudinal study designed to examine the relationships between family risk, mothers’ sensitivity, and children's social-emotional functioning in Early Head Start families. Researchers conducted two 2.5-h home visits, approximately six months apart, during which they assessed mothers’ levels of family risk, maternal sensitivity, and their children's social-emotional functioning. A theoretically derived structural equation model was tested to examine the direct paths from family risk variables to children's social-emotional functioning and the indirect paths by way of the mediator variable, maternal sensitivity. Support was found for a model that identified maternal sensitivity as a mediator of the relationship between parenting stress and children's social-emotional functioning. Results have implications for providing services through Early Head Start programs that are aimed at alleviating parenting stress and enhancing maternal sensitivity. 相似文献
995.
As more faculty members utilize student-centered methods, we should also expect to see an increase in graduate teaching assistants
(TAs) who are asked to co-teach these classes. However, little is written about the challenges TAs face and the adjustments
they make when teaching student-centered courses. This study examined a student-centered course taught by the hevruta method, a dyadic approach that emphasizes text-based student discussions. Although students reported significant learning
gains, both they and TAs had to negotiate new instructional roles. Based on student and TA feedback, strategies are presented
to facilitate effective student learning in a student-centered course co-taught by TAs. 相似文献
996.
Asha K. Jitendra Jon R. Star Michael Rodriguez Mary Lindell Fumio Someki 《Learning and Instruction》2011,21(6):731-745
This study investigated the effectiveness of an instructional program (schema-based instruction, SBI) designed to teach 7th graders how to comprehend and solve proportion problems involving ratios/rates, scale drawings, and percents. The SBI program emphasized the underlying mathematical structure of problems via schematic diagrams, focused on a 4-step procedure to support and monitor problem solving, and addressed the flexible use of alternative solution strategies based on the problem situation. Blocking by teacher at three middle schools, the authors randomly assigned the 21 classrooms to one of two conditions: SBI and control. Classroom teachers provided the instruction. Results of multilevel modeling used to test for treatment effects after accounting for pretests and other characteristics (gender, ethnicity) revealed the direct effects of SBI on mathematical problem solving at posttest. However, the improved problem solving skills were not maintained a month later when SBI was no longer in effect nor did the skills transfer to solving problems in new domain-level content. 相似文献
997.
Lang HG Hupper ML Monte DA Brown SW Babb I Scheifele PM 《Journal of deaf studies and deaf education》2007,12(1):65-79
Both classroom instruction and lexical database development stand to benefit from applied research on sign language, which takes into consideration American Sign Language rules, pedagogical issues, and teacher characteristics. In this study of technical science signs, teachers' experience with signing and, especially, knowledge of content, were found to be essential for the identification of signs appropriate for instruction. The results of this study also indicate a need for a systematic approach to examine both sign selection and its impact on learning by deaf students. Recommendations are made for the development of lexical databases and areas of research for optimizing the use of sign language in instruction. 相似文献
998.
Despite the expansion of Deaf people's use of communication technology little is published about how they use electronic communication in their social and working lives and the implications for their concepts of identity and community. Australia is an ideal research base because the use of a range of technologies is widespread there. To gain access to a wide age range of people who identify as Deaf, members of the national organization, the Australian Association of the Deaf, were surveyed by mail. Results showed that Short Message Service (SMS), telephone typewriters (TTY), voice/TTY relay services, fax, and e-mail were used regularly. Deaf users are discerning of the purposes for which they use each method: SMS for social and personal interactions, TTY for longer communications and (via the relay service) with people and services without TTYs, fax for business and social contact, and computers for personal and business e-mails as well as Web browsing, accessing chat rooms, word processing, games, and study. 相似文献
999.
In this column, three proud grandmothers share their unique stories and eloquently describe the transforming experience of becoming a grandmother and the joy associated with witnessing their daughters giving birth. 相似文献
1000.
Predictors of depressive symptoms among foster caregivers 总被引:1,自引:0,他引:1
OBJECTIVES: The main purposes of this study were to determine (1) the prevalence of depressive symptoms among foster caregivers, (2) the social-demographics, risk factors, and social support predicting depressive symptoms, and (3) whether social support buffered the effects of the risk factors in the Illinois Foster Caregivers Study. METHOD: Telephone interviews were used to collect data from a sample of 189 foster caregivers in the State of Illinois. Interviewers pretested the survey instrument, which included valid and reliable instruments on depressive symptoms and adult report of childhood maltreatment, an important risk factor for depression. Multivariate ordered logistic regression models were estimated. RESULTS: The foster caregivers exhibited few depressive symptoms, with only one respondent scoring in the clinical range. Contrary to past research on the general population, caregivers reporting higher income were at an increased risk of exhibiting depressive symptoms. The three risk factors-experiencing less than excellent or very good health, childhood maltreatment, and insufficient time to carry out responsibilities-were related to higher levels of depressive symptoms. Foster caregivers who perceived their support group as helpful had a decreased risk of reporting depressive symptoms. We found no evidence that social support buffered the effects of the risk factors. CONCLUSIONS: The results indicate that foster caregivers were adequately screened for depression, but suggest that assessing and providing assistance for health problems, trauma from childhood maltreatment, and insufficient time to meet responsibilities might decrease depressive symptoms. Facilitating and enhancing the helpfulness of foster caregiver support groups also might decrease development of depressive symptoms. 相似文献