BibSonomyburst/tag/1dBibSonomy RSS feed for /tag/1d2012-02-14T15:05:14+01:00http://www.bibsonomy.org/bibtex/2d886f5944b5d669043d3f1a12350d24f/krisrowlandkrisrowland2009-05-16T09:35:10+02:001D Bragg periodic stratified <span class="authorEditorList"><a href="/author/Yeh">Pochi Yeh</a>, <a href="/author/Yariv">Amnon Yariv</a>, and <a href="/author/Hong">Chi-Shain Hong</a> </span><em>J. Opt. Soc. Am.</em> <em>67(4):423--437</em> (<em>1977</em>)Sat May 16 09:35:10 CEST 2009J. Opt. Soc. Am.4423--437Electromagnetic propagation in periodic stratified media. I. General theory6719771D Bragg periodic stratified The propagation of electromagnetic radiation in periodically stratified media is considered. Media of finite, semi-infinite, and infinite extent are treated. A diagonalization of the unit cell translation operator is used to obtain exact solutions for the Bloch waves, the dispersion relations, and the band structure of the medium. Some new phenomena with applications to integrated optics and laser technology are presented.Optics InfoBase - Electromagnetic propagation in periodic stratified media. I. General theoryhttp://www.bibsonomy.org/bibtex/23d82349dd3082ec040f4861b2624681e/yishyish2008-05-30T05:56:46+02:001d ILE collision constructionism design education ijceell06 ijtme2006 mythesis physics weblabs webreports <span class="authorEditorList"><a href="/author/Simpson">Gordon Simpson</a>, <a href="/author/Hoyles">Celia Hoyles</a>, and <a href="/author/Noss">Richard Noss</a> </span><em>Journal of Computer Assisted Learning</em> <em>21(2):143-158</em> (<em>April 2005</em>)Fri May 30 05:56:46 CEST 2008Journal of Computer Assisted LearningApril2143-158Designing a programming-based approach for modelling scientific phenomena2120051d ILE collision constructionism design education ijceell06 ijtme2006 mythesis physics weblabs webreports We describe an iteratively designed sequence of activities involving the modelling of one-dimensional collisions between moving objects based on programming in ToonTalk. Students aged 13–14 years in two settings (London and Cyprus) investigated a number of collision situations, classified into six classes based on the relative velocities and masses of the colliding objects. We describe iterations of the system in which students engaged in a repeating cycle of activity for each collision class: prediction of object behaviour from given collision conditions, observation of a relevant video clip, building a model to represent the phenomena, testing, validating and refining their model, and publishing it – together with comments – on our web-based collaboration system, WebReports. Students were encouraged to consider the limitations of their current model, with the aim that they would eventually appreciate the benefit of constructing a general model that would work for all collision classes, rather than a different model for each class. We describe how our intention to engage students with the underlying concepts of conservation, closed systems and system states was instantiated in the activity design, and how the modelling activities afforded an alternative representational framework to traditional algebraic description.