Radiant Flux Through Apertures— II

Equations for the radiant flux through apertures are well-known. But the exact equations are cumbersome and give little direct insight into the behavior of aperture systems. The present paper considers simple approximate equations for rectangular apertures in parallel planes and in perpendicular planes. It extends the previous work (square apertures) to the general case of rectangular apertures.     

The influence of policy and context on teachers’ social media use

Research on teachers’ use of social media has typically assumed that it is a) driven by a need for professional learning and b) best understood in terms of individual motivations. In this study, we use a dataset of nearly 600,000 tweets posted to one or more of 48 Regional Educational Twitter Hashtags associated with 44 U.S. states. To explore the influence of local contextual factors on hashtag- and account-level activity in these hashtags, we use an analytic approach heretofore uncommon in social media-focussed education research: generalised linear and multilevel modelling. At the hashtag level, higher numbers of teachers within a state, proportions of students receiving subsidised meals, student-to-teacher ratios, and amounts of state spending per child are associated with more activity within a regional hashtag; by contrast, more left-leaning state governments and citizenries are associated with less activity. At the account level, more experienced accounts and accounts in more right-leaning states contribute more tweets to these hashtags. These findings reinforce established understandings of Twitter as a site for teacher learning; however, they also underline the importance of acknowledging other important purposes of teachers’ Twitter use, including receiving emotional support and engaging in activism. Practitioner notes What is already known about this topic

• Many teachers use Twitter (and other social media platforms) for professional purposes.
• Teachers have identified professional learning—among other purposes—as motivating their use of Twitter.
• Regional Educational Twitter Hashtags are diverse learning spaces for teachers and other education stakeholders.

What this paper adds

• Local context and policy factors help influence teachers’ use of Twitter.
• Teachers may turn to Twitter because of a lack of emotional or political support—not just a lack of material support or professional development opportunities.
• Individual and idiosyncratic factors remain important in explaining teachers’ engagement with social media.

Implications for practice and/or policy

• Informal spaces like social media may supplement formal support mechanisms for teachers.
• Teachers’ use of social media may help administrators and policymakers identify existing gaps to be repaired in those formal support mechanisms.
• Support for teachers should be conceived holistically and include emotional and political support.

     

The RAVE-O Intervention: Connecting Neuroscience to the Classroom

ABSTRACT—This article explores the ways in which knowledge from the cognitive neurosciences, linguistics, and education interact to deepen our understanding of reading's complexity and to inform reading intervention. We first describe how research on brain abnormalities and naming speed processes has shaped both our conceptualization of reading disabilities and the design of a multicomponent reading intervention, the RAVE-O program. We then discuss the unique ways this program seeks to address the multiple and varied sources of disruption in struggling readers. Finally, we present efficacy data for the RAVE-O reading intervention across multiple school settings.     

Radiation fields from polygonal sources

The calculation of the radiation field D(x, y, z) produced by a uniform polygonal source is of considerable practical importance. Fock showed that there are advantages in replacing the traditional surface integral by a contour integral, using Stokes' theorem. This innovation, however, has not yet penetrated very deeply. It seemed worthwhile, therefore, to systematize the procedure and to show how easily results can be obtained by the Fock method. An incidental conclusion of the paper is that the radiation field from a polygonal source often differs by less than one per cent from the field produced by a circular disk of the same area. Thus the simple disk formula can often be substituted for the more complicated polygonal formula.     

Developing life-role readiness in a multicultural society: Topics to consider

In this paper a conceptual framework for developing life-role readiness in a multicultural society is presented. Life-role readiness is defined as the possession of the knowledge, attitudes, and skills necessary for effective life-role participation. Life-role salience, cultural influences on life-role salience, and specific activities to foster life-role readiness are addressed. Interventions are identified for each topic.     

Predicting word-spelling difficulty in 7- to 11-year-olds

Some languages have simple grapheme-phoneme codes in which there is a one-to-one mapping, making them easy to teach and learn, while others have more complicated structures and are more difficult for teachers and students. There is now an increasing number of studies which demonstrate that readers in more transparent orthographies such as Italian, Spanish, Turkish, Greek and German have little difficulty in decoding written words, while English children have many more problems. Increasingly, lack of orthographic transparency in English is seen as having a powerful negative effect on the development of literacy skills in English-speaking children. In the present study, the word factors associated with poor spelling in 5 school year-groups (ages 7 to 11 years) are identified as: (a) frequency of the word in the English language, (b) length of the word and (c) a measure of the phoneticity of the word. The concept of word phoneticity is explored and data is presented illustrating the predictive model of spelling. The implications the model has for teaching and learning English are discussed, with particular reference to the beneficial effects that greater orthographic transparency would have for children.