Student and Teacher Outcomes of The Superkids Quasi-Experimental Study     

Geoffrey D. Borman  N. Maritza Dowling 《Journal of Education for Students Placed at Risk》2013,18(3):207-225

In this article, we report kindergarten student and teacher outcomes from a quasi-experimental evaluation of The Superkids, a systematic, phonics-based, comprehensive K-2 reading program. We recruited 23 kindergarten teachers to implement The Superkids program from a diverse, yet predominantly ethnic minority, group of classrooms from across the United States. We then employed a precise computerized matching methodology to derive a statistically equivalent comparison group of 20 control teachers who implemented their standard “business as usual” core literacy program. Multilevel analyses of classroom-level effects of The Superkids revealed achievement advantages of more than 1/10 of a standard deviation, d = 0.11, to 1/4 of a standard deviation, d = 0.25, for the treatment group on the 5 subtests from the Stanford Achievement Test, 10th edition (SAT-10). Four measures of teachers’ self-reported satisfaction with the core reading program used in their classrooms also revealed statistically significant advantages for Superkids of nearly three-quarters of a standard deviation, d = 0.72, to nearly 1½ standard deviation units, d = 1.49.  相似文献   

Potentiation of responding on a VR schedule by a stimulus correlated with reinforcement: Effects of diffuse and localized signals     

Phil Reed  Todd R. Schachtman  Geoffrey Hall 《Learning & behavior》1988,16(1):75-82

In Experiment 1, rats were trained to leverpress on a variable ratio (VR) 30 schedule with a 500-msec delay between the reinforced response and food delivery. Subjects that experienced a signal during the delay responded faster than did control subjects that received the stimulus un-correlated with reinforcement. Higher response rates were obtained when the stimulus used to signal reinforcement was auditory rather than visual. Experiments 2 and 3 compared the effects of signaling reinforcement with either a localized or a diffuse light on responding maintained by VR schedules of reinforcement. Elevated response rates were observed with the diffuse stimulus, but the localized stimulus failed to produce such potentiation. Experiment 3 also examined the conditioned reinforcing power of localized and diffuse visual stimuli. These results are discussed with reference to (1) theories of selective association and sign tracking and (2) their implications for current theories of signaling reinforcement.  相似文献   

基于信息通信技术的开放与远程学习——在“2008世界开放与远程教育论坛”上的主题报告     

阿布杜拉·罕  怀章翠 《开放教育研究》2008,14(6):21-24

非常感谢中国联合国教科文组织全国委员会的盛情邀请,对于联合国教科文组织每位成员细致人微的工作,我都赞叹不已。在此,非常感谢你们如此出色的工作,同时与这样的团队及成员合作我感到非常愉快,而且常受益匪浅。我已有七八年的时间没有从事开放与远程学习领域的工作,但我确信这个领域已经取得了长足的发展,因此站在这里我感到有些不安,报告中的不妥之处还请大家谅解。  相似文献   

Effect of methyl mercury induced free radical stress on nucleic acids and protein: Implications on cognitive and motor functions     

Farhana Zahir  Shameem J Rizvi  Soghra K Haq  Rizwan H Khan 《Indian journal of clinical biochemistry : IJCB》2006,21(2):149-152

Mercury pollution and acute neurotoxicity of mercury is well known. The recent reports suggest the adverse effect of low dose mercury, though the available literature is still silent on its mechanism. This study was therefore undertaken to probe the effect of low dose methyl mercury induced heavy metal toxicity on free radical stress and its impact on behaviour of male albino rats. Male albino rats were exposed to 1 mg/kg body wt of methylmercury chloride for seven days, on day 8 they were tested for motor and memory functions. They were sacrificed later for biochemical estimations for rate of lipid peroxidation, nucleic acids, proteins in cerebrum, cerebellum and brain stem. There was an increase in the rate of lipid peroxidation showing methyl mercury induced free radical stress. The motor and memory functions demonstrated a clear decline, besides there was a lowering in the levels of nucleic acids and proteins as compared to controls. The results are important in view of recent reports that methyl mercury induced free radical stress results in early ageing and may serve as an initiating factor more specifically for neurodegenerative disorders like Alzeihemer's disease and dementias. The current findings support the notion that incorporating dietary antioxidants like curcumin, ascorbic acid and α-tocopherol in routine diet from early age may help combat the risk of developing such disorders in ensuing years.  相似文献   

Enacting silence: Residual categories as a challenge for ethics,information systems,and communication     

Susan Leigh Star  Geoffrey C. Bowker 《Ethics and Information Technology》2007,9(4):273-280

Residual categories are those which cannot be formally represented within a given classification system. We examine the forms that residuality takes within our information systems today, and explore some silences which form around those inhabiting particular residual categories. We argue that there is significant ethical and political work to be done in exploring residuality.  相似文献   

The Opportunities of Distance     

Geoffrey Bolton 《Distance Education》1986,7(1):5-22

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The Business of Educational Development     

Geoffrey Hubbard 《British journal of educational technology : journal of the Council for Educational Technology》1980,11(3):156-159

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Physicochemical characteristics of various milk samples available in Pakistan     

Imran M  Khan H  Hassan SS  Khan R 《Journal of Zhejiang University. Science. B》2008,9(7):546-551

We report physicochemical characteristics of various kinds of liquid milk commercially available in Pakistan in comparison with those of fresh natural milk from animals. Milk samples were collected from local markets at Peshawar, Pakistan,and analyzed for their physical features, including moisture, total solids, specific gravity, conductivity, viscosity and titratable acidity (lactic acid equivalent), and chemical components and macro-minerals, including total protein, casein, lactose, ash and minerals (Na, K and Mg). These items were compared with the physicochemical characteristics of the fresh natural milk samples from buffalo, cow and goat. The results were also compared with reported nutritional quality of milk from various countries and World Health Organization (WHO) standards. We found that all the physical features and chemical components of commercially available milk in Pakistan markets meet WHO's requirements, except for Na, K, Ca and Mg, which are below the standards.  相似文献   

Racial Attitudes among Caucasian Children: an empirical study of Allport's ‘total rejection’ hypothesis     

Geoffrey A. Short 《Educational studies》1981,7(3):197-204

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Book reviews     

Alec M. Ross  Orlando Albornoz  Geoffrey Squires  Burton R. Clark  Lynn Davies  Mark Bray 《Higher Education》1990,20(3):339-354

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