Stability of Intelligence from Preschool to Adolescence: The Influence of Social and Family Risk Factors   总被引：25，自引：1，他引：25  

Arnold J. Sameroff  Ronald Seifer  Alfred Baldwin  Clara Baldwin 《Child development》1993,64(1):80-97

Intelligence scores of children in a longitudinal study were assessed at 4 and 13 years and related to social and family risk factors. A multiple environmental risk score was calculated for each child by counting the number of high-risk conditions from 10 risk factors: mother's behavior, mother's developmental beliefs, mother's anxiety, mother's mental health, mother's educational attainment, family social support, family size, major stressful life events, occupation of head of household, and disadvantaged minority status. Multiple risk scores explained one-third to one-half of IQ variance at 4 and 13 years. The stability between 4- and 13-year environmental risk scores ( r = .77) was not less than the stability between 4- and 13-year IQ scores ( r = .72). Effects remained after SES and race, or maternal IQ, were partialled; multiple risk was important in longitudinal prediction, even after prior measurement of child IQ was accounted for; the pattern of risk was less important than the total amount of risk present in the child's context.  相似文献   

Initiations of social interactions by young hearing impaired preschoolers     

Weisel A  Most T  Efron C 《Journal of deaf studies and deaf education》2005,10(2):161-170

This study examined strategies for initiating social interactions with peers, among 4 children with hearing impairment, aged 33 to 36 months, attending a special early education center or a regular kindergarten. The study investigated initiation type (related to partner's hearing status) and rates of initiation success/failure vis-a-vis hearing and deaf partners. Results revealed (a) more initiations in the regular program than in the special program; (b) in the special program, much more successful initiations toward children with hearing impairment than toward hearing children; (c) vocalization as the most frequent strategy used with both hearing and hearing-impaired partners; and (d) referential decisions about their initiations even among young children with hearing impairment (made by changing frequencies of various strategies according to partner's hearing status). The discussion addressed implications regarding integration of children with hearing impairment into regular educational settings.  相似文献   

Change-of direction deficit in elite young soccer players     

Irineu Loturco  Sophia Nimphius  Ronaldo Kobal  Altamiro Bottino  Vinicius Zanetti  Lucas A. Pereira  Ian Jeffreys 《Sportwissenschaft》2018,48(2):228-234

Change-of-direction (COD) ability is an essential physical component for soccer. This study examined the relationships between conventional speed–power assessments and COD performance in elite young soccer players. Twenty-five under-20 male players from the same club (age: 17.6?±?0.8 years, height: 178.1?±?6.7?cm, body mass [BM]: 72.2?±?7.9?kg) performed sprint speed tests, vertical jumps, loaded jump squats, half squats, and Zigzag COD assessments. Moreover, the COD deficit was calculated as the difference between 20-m sprint velocity and Zigzag COD test velocity. A Pearson correlation analysis was used to determine the correlations between Zigzag COD performance and COD deficit with speed and power outputs. Although no significant relationships between speed–power variables and COD ability were present, there were still strong positive correlations between traditional neuromechanical measures and COD deficit. Briefly, it seems that higher performances in speed and power tests are not necessarily related to better performances in specific COD maneuvers. Therefore, it is recommended that coaches and technical staff include specific COD drills in soccer player routines to optimize the transference from speed and power capacities to specific COD performance.  相似文献   

Ethics of social networks for special needs users     

Caroline Rizza  Ângela Guimarães Pereira 《Ethics and Information Technology》2013,15(4):249-251

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Effects of cigarette smoking on cardiac autonomic function during dynamic exercise     

Goncalo V. Mendonca  Fernando D. Pereira  Bo Fernhall 《Journal of sports sciences》2013,31(9):879-886

Abstract

The purpose of this study was to investigate the acute effect of cigarette smoking on cardiac autonomic function in young adult smokers during dynamic exercise. Fourteen healthy young smokers (21.4 ± 3.4 years) performed peak and submaximal exercise protocols under control and smoking conditions. Resting and submaximal beat-to-beat R-R series were recorded and spectrally decomposed using the fast Fourier transformation. Smoking resulted in a significant decrease in work time, [Vdot]O_2peak and peak O₂ pulse (P < 0.05). Heart rate increased at rest and during submaximal exercise after smoking (P < 0.05). The raw high frequency and low frequency power were significantly reduced by smoking, both at rest and during exercise (P < 0.05). The low to high frequency ratio was higher after smoking (P < 0.05). The normalised low frequency power was also significantly increased by smoking, but only at rest (P < 0.05). These data demonstrate that the tachycardic effect elicited by smoking is accompanied by acute changes in heart rate spectral components both at rest and during exercise. Therefore, the cardiac autonomic control is altered by smoking not only at rest, but also during exercise, resulting in reduced vagal modulation and increased sympathetic dominance.  相似文献   

Disentangling the effect of education on emergency department utilization     

Clara E. Dismuke  F. Michael Kunz  Jr 《Economics of Education Review》2004,23(6):633

Since Grossman’s seminal paper in 1972, there have been a number of studies concerning the effect of education on health and health care demand. Though several studies have distinguished between preventive and curative care, no study has investigated the effects of general education on the utilization of unnecessary emergency department use. We test whether general education reduces “potentially unnecessary” emergency department utilization and provide a measure of the resulting private benefits associated with increased education. Our results partially confirm our hypothesis regarding “potentially unnecessary” emergency department use. We find that moving from a high school to greater than high school education appears to reduce “potentially unnecessary” emergency department use, with the impact being greater among the insured. However, though reducing the education level from high school to less than high school increases “potentially unnecessary” emergency department use among the insured as predicted, it has the opposite impact on the uninsured.  相似文献   

MENTAL MODELS ABOUT SEISMIC EFFECTS: STUDENTS’ PROFILE BASED COMPARATIVE ANALYSIS     

Sara Moutinho  Rui Moura  Clara Vasconcelos 《International Journal of Science and Mathematics Education》2016,14(3):391-415

Nowadays, meaningful learning takes a central role in science education and is based in mental models that allow the representation of the real world by individuals. Thus, it is essential to analyse the student’s mental models by promoting an easier reconstruction of scientific knowledge, by allowing them to become consistent with the curricular models presented in the classroom. In this context, the study aims to examine, through the application of a diagnostic instrument (Two-Tier Diagnostic Test), what students consider to be the seismic effects on soils and buildings, to analyse and to compare their mental models about some of these issues related to seismology, applying a questionnaire to 52 students from a Portuguese University attending an undergraduate degree in Geology and a master course in Biology and Geology teaching. The analysis of the data allowed concluding that undergraduate students have more inconsistent mental models than master students, mainly concerning the factors which influence the seismic risk, such as hazard and vulnerability, and the soils characteristics which influence the intensity of earthquakes. During their academic formation in the university, teachers present some curricular models to students which allow them to reconstruct their mental models and turn them scientifically consistent, enhancing the educational implications of this study that points to the need for teachers to be aware of the importance of the diagnosis of the students’ mental models and to promote meaningful learning and scientific literacy autonomously and dynamically.  相似文献   

How do different types of schools prepare students for life at Cambridge?     

Clara Perez-Adamson 《Cambridge Journal of Education》2016,46(1):19-35

Twenty students from different educational backgrounds within the UK were interviewed to investigate how well they considered their secondary school education had prepared them for the educational and social demands of an ‘elite’ university and life within its most traditional colleges. The study asked them how they perceived students from different educational backgrounds and how they thought they were perceived. Entering a traditional Cambridge college was found to be easiest for students from prestigious ‘public schools’ within the private educational sector. State school students were more likely to experience anxiety, and those who adapted successfully were likely to have strong independent learning skills and a robust sense of self-efficacy. The study suggests that students coming from state schools to Cambridge are making a more difficult academic and social transition than students from private schools, for which they are given no special support.  相似文献   

Measurement and analysis of soil nitrogen and organic matter content using near-infrared spectroscopy techniques   总被引：2，自引：0，他引：2  

He Y  Song HY  Pereira AG  Gómez AH 《Journal of Zhejiang University. Science. B》2005,6(11):1081-1086

Near infrared reflectance （N1R） spectroscopy is as a rapid, convenient and simple nondestructive technique useful for quantifying several soil properties. This method was used to estimate nitrogen （N） and organic matter （OM） content in a soil of Zhejiang Province, Hangzhou County. A total of 125 soil samples were taken from the field. Ninety-five samples spectra were used during the calibration and cross validation stage. Thirty samples spectra were used to predict N and OM concentration. NIR spectra of these samples were correlated using partial least square regression. The regression coefficients between measured and predicted values of N and OM was 0.92 and 0.93, and SEP （standard error of prediction） were 3.28 and 0.06, respectively, which showed that NIR method had potential to accurately predict these constituents in this soil. The results showed that NIR spectroscopy could be a good tool for precision farming application.  相似文献   

Multiple paths towards education privatization in a globalizing world: a cultural political economy review     

Antoni Verger  Clara Fontdevila  Adrián Zancajo 《教育政策杂志》2017,32(6):757-787

Over the last two decades, education privatization has become a widespread phenomenon, affecting most education systems and giving place to a consistent increase in private school enrolment globally. However, far from being a monolithic phenomenon, privatization advances through a variety of context-sensitive policy processes that translate into multiple policy outcomes. This paper aims at understanding why and how education privatization unfolds in a broad variety of settings and, to this purpose, examines the different manifestations of education privatization on the light of Cultural Political Economy (CPE). The conceptual and analytical tools provided by CPE prove to be particularly well suited to explore such a multi-faceted and multi-scalar phenomenon. CPE has helped us to capture the intersect and tension between different drivers (global and local, material and ideational) of education privatization through the evolutionary mechanisms of variation, selection and retention. On the basis of a systematic literature review methodology, encompassing 227 research papers, the article identifies and systematizes six different paths towards education privatization – understood as groups of frequently associated circumstances, mechanisms and courses of action leading to privatization. Conceived as ideal types, these different paths ultimately allow for a richer understanding of education privatization and show that the international diffusion of education privatization norms and discourses is far from producing policy convergence at a global scale.  相似文献