42,525 research outputs found
A Framework for Active Learning: Revisited
Over the past decade, algorithm visualization tools have been researched and developed to be used by Computer Science instructors to ease students’ learning curve for new concepts. However, limitations such as rigid animation frameworks, lack of user interaction with the visualization created, and learning a new language and environment, have severely reduced instructors’ desire to use such a tool. The purpose of this project is to create a tool that overcomes these limitations. Instructors do not have to get familiar with a new framework and learn another language. The API used to create algorithm animation for this project is through Java, a programming language familiar to many instructors. Moreover, not only do the instructors have control over planning the animation, students using the animation will also have the ability to interact with it
Optimal lower bounds on the local stress inside random thermoelastic composites
A methodology is presented for bounding all higher moments of the local
hydrostatic stress field inside random two phase linear thermoelastic media
undergoing macroscopic thermomechanical loading. The method also provides a
lower bound on the maximum local stress. Explicit formulas for the optimal
lower bounds are found that are expressed in terms of the applied macro- scopic
thermal and mechanical loading, coefficients of thermal expansion, elastic
properties, and volume fractions. These bounds provide a means to measure load
transfer across length scales relating the excursions of the local fields to
the applied loads and the thermal stresses inside each phase. These bounds are
shown to be the best possible in that they are attained by the Hashin-Shtrikman
coated sphere assemblage.Comment: 14 page
Isospin-Violating Dark Matter and Neutrinos From the Sun
We study the indirect detection of dark matter through neutrino flux from
their annihilation in the center of the Sun, in a class of theories where the
dark matter-nucleon spin-independent interactions break the isospin symmetry.
We point out that, while the direct detection bounds with heavy targets like
Xenon are weakened and reconciled with the positive signals in DAMA and CoGeNT
experiments, the indirect detection using neutrino telescopes can impose a
relatively stronger constraint and brings tension to such explanation, if the
annihilation is dominated by heavy quark or -lepton final states. As a
consequence, the qualified isospin violating dark matter candidate has to
preferably annihilate into light flavors.Comment: 5 pages, 3 figures, 1 tabl
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