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   246篇
  免费   6篇
  国内免费   1篇
教育   135篇
科学研究   30篇
各国文化   9篇
体育   9篇
信息传播   70篇
  2023年   1篇
  2022年   1篇
  2021年   13篇
  2020年   5篇
  2019年   11篇
  2018年   11篇
  2017年   12篇
  2016年   11篇
  2015年   3篇
  2014年   5篇
  2013年   102篇
  2012年   5篇
  2011年   6篇
  2010年   3篇
  2009年   3篇
  2008年   8篇
  2007年   2篇
  2006年   3篇
  2005年   5篇
  2004年   5篇
  2003年   1篇
  2002年   4篇
  2001年   2篇
  2000年   6篇
  1999年   2篇
  1998年   2篇
  1997年   1篇
  1996年   2篇
  1995年   1篇
  1993年   1篇
  1990年   2篇
  1988年   1篇
  1982年   2篇
  1979年   3篇
  1975年   2篇
  1974年   1篇
  1973年   2篇
  1972年   1篇
  1971年   1篇
  1955年   1篇
排序方式: 共有253条查询结果,搜索用时 15 毫秒
1.
BackgroundWhile the literature on physical punishment concludes that it has negative effects on children, the practice remains common in many countries. In post-conflict countries with nongovernmental organizations (NGO) operating in child protection, traditional disciplinary practices may conflict with international child rights agendas. The country of Sierra Leone has a unique history of conflict, abject poverty, low literacy, and weak governance – often, NGO agents are responsible for providing social services that the government is unable to consistently provide.ObjectiveWe examined how Sierra Leonean caregivers think about appropriate discipline for children, and whether they perceived any changes in their attitudes toward disciplinary practices since the end of the war.Participants and SettingWe collected data from parents and caregivers in urban, peri-urban, and rural areas of Sierra Leone’s four districts.MethodsWe used focus groups (12 groups, n = 92) and individual interviews (n = 21) to collect data in 2013. Focus groups and interviews were conducted by research assistants fluent in Krio and English. We used a thematic content analysis approach.ResultsWe found that physical discipline—“beating”—was widely acceptable and common. A few parents mentioned other means of discipline, such as withholding food. Parents widely agreed that parenting had changed since the war, and reported that child rights movements supported by NGOs had made it more difficult to discipline their children in traditional ways.ConclusionsDiscipline was seen a central component of child-rearing and a means of ensuring safe and proper development. This may be a protective mechanism in the precarious, high poverty environment of post-war Sierra Leone. The negative responses of parents to NGO efforts to reduce physical punishment and other forms of child abuse suggest that grassroots approaches are needed to address this pervasive problem.  相似文献   
2.
3.
Renting a property via a peer-to-peer platform involves a variety of risks. Humans inherently, subconsciously use facial cues as important shortcuts in making assessments about other persons. On property sharing platforms, such as Airbnb, facial cues can be used in a similar fashion alongside reputational information. According to Dangerous Decisions Theory (DDT), intuitive evaluations of trustworthiness based on faces can bias subsequent assessment of an individual, requiring further information sources to make a more balanced assessment. In this study we apply DDT to demonstrate that evaluations based on perceived facial trustworthiness are overvalued; when combined with reputational measures, such as ‘super host’ status, such assessments are diminished. The study is based on deep learning to classify host faces for a large data set of online accommodation (n = 78,386). The research demonstrates that facial trust cues in online platforms should be treated with caution and must be combined with more objective measures of reputation in order to reduce the effects of overvaluation. The paper concludes with implications for practice and future research.  相似文献   
4.
The ubiquitous fungus Aspergillus fumigatus causes allergic rhinitis, asthma, sinusitis and allergic bronchopulmonary aspergillosis. A number of major allergens from A. fumigatus are purified, but their structure-function role in the pathogenesis of disease is not known. Such information is essential for devising alternative therapy of fungal allergic diseases. In the present study, N-terminal and C-terminal deletion mutants ofAsp f 3 were constructed and their immunopathological responses studied in a mice model of allergy. Three mutants viz,Asp f 3 (aa 33–168), (aa 1–142), and (aa 23–142) were made by deleting certain amino acids from epitopic regions of full lengthAsp f 3, a major allergen of A. furnigatus. TheAsp f 3 and three mutated proteins were expressed in pET vector. The C-terminal deletion mutantAsp f 3 (aa 1–142) induced elevated IFN-γ but low levels of IL-4 by spleen cells. This mutant also showed significant downregulation of peripheral blood eosinophils and lung inflammation in immunized mice. The N-terminal deletion mutantAsp f 3 (aa 33–168) also exhibited an immuno-suppressive effect in terms of IgE production and induction of Th2 cytokine. The results indicate thatrAsp f 3 and its deletion mutants induced distinct immune-inflammatory responses in mice on challenge with these proteins. The non-IgE binding deletion mutants ofAsp f 3 (aa 1–142 and aa 33–168) could deviate Th2 immune response with a concomitant reduction in airway inflammation and infiltration of inflammatory cells.  相似文献   
5.
This study investigated different environmental and contextual factors associated with maltreated children's adjustment in foster care. Participants included 83 children (52 boys), ages 1–7 years, and their foster caregivers. Quality of interaction with the foster caregiver was assessed from direct observation of a free-play situation; foster caregiver attachment state of mind and commitment toward the child were assessed using two interviews; disruptive behavior symptoms were reported by foster caregivers. Results showed that quality of interaction between foster caregivers and children were associated with behavior problems, such that higher-quality interactions were related to fewer externalizing and internalizing problems. Foster caregivers’ state of mind and commitment were interrelated but not directly associated with behavior problems of foster children. Type of placement moderated the association between foster caregiver commitment and foster child behavior problems. Whereas greater foster caregiver commitment was associated with higher levels of adjustment for children in foster families (kin and non-kin), this was not the case in foster-to-adopt families. Finally, the associations between foster child behavior problems and history of maltreatment and placement related-risk conditions fell below significance after considering child age and quality of interaction with the foster caregiver. Findings underscore the crucial contribution of the foster caregiver–child relationship to fostering child adjustment and, thereby, have important implications for clinical services offered to this population.  相似文献   
6.
This study set out to investigate the effects of positive affectivity (PA) on expatriate creativity and perceived performance in the host country workplace. Most importantly, the study examined the moderating role of perceived cultural novelty in the relationship between PA and creativity and its consequences for the indirect association between PA and perceived performance as mediated via creativity. Data from 297 expatriates in Denmark were collected and hypotheses were tested using regression-based analyses. Consistent with predictions, findings showed a positive relationship between PA and creativity. In addition, PA was positively associated with perceived performance. Results of mediation analysis indicated that creativity mediated the effects of PA on perceived performance. While a moderating effect of perceived cultural novelty in the relation between PA and creativity was found, this moderation was in the opposite direction of the postulated hypothesis, i.e. the positive association between PA and creativity was strongly attenuated at high levels of perceived cultural novelty. Subsequent moderated mediation analysis showed that the identified mediation ceased to exist at high levels of perceived cultural novelty.  相似文献   
7.
When children are placed into foster care the caseworker must give preference to an adult relative, many of whom are grandparents, over an unrelated caregiver. This kinship preference is based in evolutionary biology, which suggests that the imperative to care for a child should be greater for kin versus non-kin. However, not all kin are related to a child in the same way, and level of paternity uncertainty may influence level of care provided. For instance, maternal grandparents can be assured that they share genetic material with their grandchild, while paternal grandparents may not have the same level of certainty. Owing to the possibility of paternity uncertainty, we hypothesize that out-of-home placements with paternal grandparents will be at a greater risk of subsequent investigations than placements with maternal grandparents or with foster parents. We secured data on placements n = 560 of children ages 1.5 to 17 following a maltreatment investigation from a merger of the National Survey of Child and Adolescent Well-Being NSCAW II and the National Child Abuse and Neglect Data System NCANDS. Kaplan-Meier and multivariate Cox regression were used to examine the difference in time to the first new investigation by type of out-of-home placement while controlling for covariates. Consistent with our hypothesis, placements with paternal grandparents were at a higher risk of a subsequent investigations than placements with maternal grandparents or non-kin foster parents. Results suggest a need for further considerations of child safety in foster care based on genetic relatedness of caregivers.  相似文献   
8.
Google为用户提供了多种检索功能,但这些检索功能的性能如何却少见于相关文献中。作者对Google的两种较为独特的检索功能进行了评析,分别是相似检索和链接检索,并以普通检索作为评价的标准。本文采用了20个检索式和20个目标网页,对相似检索、链接检索和普通检索的检索性能差异性进行了评价。研究中主要利用单因素方差分析法和回归分析法。研究结果显示普通检索表现最好。研究成果能帮助用户对相似检索和链接检索有较为清晰的认识,并且可以了解Google在这两种检索功能上所表现出的不同的检索性能。  相似文献   
9.
How do firm-specific factors impact strategic IT decisions such as IT outsourcing? Do non-financial factors influence these decisions? Whereas prior IT outsourcing research has focused primarily on normative, economic drivers of IT outsourcing, we find evidence of firm-specific non-financial factors influencing IT outsourcing decisions. We focus on the social influence perspective and use IT outsourcing decisions as exemplars of strategic IT decisions. Using a data sample of 77 outsourcing contracts from the automotive industry from 1995 to 2010, we find that even after controlling for financial factors, industry average levels of outsourcing can be used to distinguish strategic outsourcing behaviors of firms for IT enabled services. Firms with above-average levels of IT outsourcing tended to further increase outsourcing, a behavior consistent with perceived Red Queen competitive pressures. Firms with below-average levels of IT outsourcing showed no measurable trends of either increasing or decreasing outsourcing levels. This suggests that firm-specific factors influence IT outsourcing decisions and deviations from non-financial industry norms can indicate how firms make strategic IT decisions.  相似文献   
10.
This paper examines the difficulties encountered by Biowatch, a South African civil society environmental organization, in its attempts to obtain access to government information in respect of genetically engineered plants. After establishing the context of South Africa's access to information regime, including a brief discussion of several of its weaknesses, the paper engages in an extended account of the Biowatch case as an exemplar of some of the more pronounced challenges to the effective implementation of the country's access to information legislation. The elaboration of the case is based on interviews conducted with the Director of Biowatch and counsel from the Legal Resources Centre that aided Biowatch, as well as various internal and court documents provided by Biowatch and its lawyers.  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