Lighting the world with molecules     

S. Ramasesha 《Resonance》2009,14(8):782-798

Efficient lighting and display have become important concerns in the energy-starved modern world. This has led to new paradigms in lighting and display technologies. Organic molecules provide a new class of active materials for such technologies. This article gives the basic science behind the design of such molecular materials used in displays and lighting.  相似文献   

Moral minds     

Steve Clarke 《Minerva》2008,46(1):147-150

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Sträuli Arslan,Leseknick — Lesekick. Leseförderung in vielsprachigen Schulen     

Mechtild Gomolla 《Zeitschrift für Erziehungswissenschaft》2007,10(1):126-127

Ohne Zusammenfassung  相似文献   

The conditions of activation of unfertilized starfish eggs by the electric current     

R.S. Lillie  Ware Cattell 《Journal of The Franklin Institute》1923,195(6):859-860

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The production of available potash from the natural silicites     

Allerton S. Cushman  George W. Coggeshall 《Journal of The Franklin Institute》1912,174(6):663-678

In this paper a summary is given of the various processes which have been proposed for making the potash in the natural silicates available as a fertilizer.Experimental trials of a new rotary kiln process for treating feldspar are described, which depends upon a previous treatment before furnacing, consisting of a method of aggregating or clumping the mix so that chemical contact of the reacting substances is brought about during the subsequent processing. The qualitative and quantitative results obtained on a number of experimental trials on a mill scale of operation are presented and discussed. It is shown that it is possible to economically manufacture a potash fertilizer containing free lime from feldspar, and for a sufficiently low cost to make an industry based upon the method worthy of consideration.  相似文献   

Extended Test Time and postsecondary Students with Learning Disabilities: A Model for Decision Making     

Nicole S. Ofiesh  Charles Hughes  Sally S. Scott 《Learning disabilities research & practice》2004,19(1):57-70

The most frequently requested accommodation among students with learning disabilities (LD) in postsecondary settings is extended test time. The frequency with which this accommodation is requested and granted compels disability service providers to become knowledgeable about the factors that influence the need for, and appropriateness of, the accommodation. Moreover, the synthesis of these factors becomes the basis for determining if the accommodation is reasonable under federal law. The purpose of this article is to present a step‐by‐step model to be used as a decision‐making process when considering the accommodation of extended test time for postsecondary students with LD. The model is designed to assist disability service providers in the analysis and synthesis of information collected from (1) the student's diagnostic evaluation, (2) the course or classroom test to be accommodated, and (3) student interviews. A list of diagnostic tests from the four most frequently administered test batteries used with adults is provided, along with a concise explanation of how characteristics of LD impact reading, writing, and math, and relate to the need for extended time. This information can be used to determine if extended test time is a reasonable accommodation and to estimate how much additional time to provide.  相似文献   

Learning power globally?     

Wiel Veugelers 《Journal of Educational Change》2007,8(2):181-184

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Guest Editorial     

Bridget Somekh 《Education and Information Technologies》2005,10(3):145-146

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Engineering Education in Hungary     

TAMÁS MATUSCSÁK 《European Journal of Engineering Education》1993,18(1):41-47

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International Early Childhood Resources from Educational Research Abstracts (ERA)     

L. Girolametto  S. Bonifacio  C. Visini  E. Weitzman  E. Zocconi  P.S. Pearce 《International Journal of Early Years Education》2003,11(3):255-260

The aim was to examine cross-cultural variation in linguistic responsiveness to young children in 10 English-speaking mother–child dyads and 10 Italian-speaking mother– child dyads. All 20 children were late talkers who possessed delays in expressive vocabulary development but age-appropriate cognitive and receptive language skills. Dyads were filmed in 15 minute free play contexts, which were transcribed and coded for measures of maternal linguistic input (e.g. rate, MLU, labels, expansions) and child language productivity (e.g. utterances, different words used). The results revealed that the Italian mothers used more utterances, spoke more quickly and used a more diverse vocabulary than the Canadian mothers. The Italian children mirrored their mothers and also used more utterances and a more diverse vocabulary than the Canadian children. Mothers in both groups used similar percentages of responsive labels and expansions. However, Italian mothers responded to fewer of their children's vocalisations, using a smaller percentage of imitations and interpretations than the Canadian mothers. Correlations between maternal input and children's language productivity revealed that contingent language measures (e.g. imitations, interpretations, expansions) were related to high levels of productivity in children in both cultural groups. The results support the use of language interventions based on increasing maternal responsiveness for these children at the one-word stage of language development. They also point to differences that may be culturally based. For example, Italian mothers use faster rates of interaction and appear to have higher expectations for their children's verbal participation in interaction. This is reflected in higher rates of language production from their children, even though children in both cultural groups have similar vocabulary sizes.  相似文献