Peer Victimization in Students who are Deaf and Hard of Hearing: Exploring Educational Placement

Forty-five American students who are Deaf/hard of hearing (SWD/HOH) in grades 5-12 completed a survey assessing their experiences with peer victimization. Almost four-fifths reported victimizing peers over the past two months, and almost 90% reported being the victim of peer victimization during that same timeframe. The most commonly reported types of peer victimization were verbal and relational aggression. Students who attended a Deaf-only campus reported greater mean victimization than those attending magnet programs located in general education schools. The results highlight the need for evidence-based programs that address peer victimization among SWD/HOH

Getting More From Social Skills

Every teacher has had the experience of teaching a student who exhibits difficult behaviors; the kind of behaviors that make it hard for the teacher to teach and hard for the student to learn. One popular intervention has been to give the student social skills training. Teaching students the social skills they lack is a natural choice for teachers because it is similar to how they teach academic skills. And yet, despite the natural fit, social skills training has not always been an effective intervention. Researchers have studied social skills training at every level of intervention. They have studied it as a Tier 1 class-wide or school-wide intervention, as a Tier 2 small group intervention, and as a Tier 3 individualized intensive intervention. At every level, the research has produced mixed and often unimpressive results (Gresham, 1998; Gresham, Sugai, & Horner, 2001). These results bring up an important question, “Should teachers and related service providers continue to use social skills training to address the problem behavior of students?” The remainder of this article will address this question. First, social skills will be defined along with the variety of problems that typical social skills programs suffer from. Second, a review of some of the research literature on Tier 2 social skills training will be provided. Finally, recommendations for improving social skills training interventions will be discussed

Top Quark Physics at the Tevatron

We review the field of top-quark physics with an emphasis on experimental techniques. The role of the top quark in the Standard Model of particle physics is summarized and the basic phenomenology of top-quark production and decay is introduced. We discuss how contributions from physics beyond the Standard Model could affect top-quark properties or event samples. The many measurements made at the Fermilab Tevatron, which test the Standard Model predictions or probe for direct evidence of new physics using the top-quark event samples, are reviewed here.Comment: 50 pages, 17 figures, 2 tables; version accepted by Review of Modern Physic

Dynamical structure factor of a nonlinear Klein-Gordon lattice

The quantum modes of a nonlinear Klein-Gordon lattice have been computed numerically [L. Proville, Phys. Rev. B 71, 104306 (2005)]. The on-site nonlinearity has been found to lead to phonon bound states. In the present paper, we compute numerically the dynamical structure factor so as to simulate the coherent scattering cross section at low temperature. The inelastic contribution is studied as a function of the on-site anharmonicity. Interestingly, our numerical method is not limited to the weak anharmonicity and permits one to study thoroughly the spectra of nonlinear phonons

Mojave Applied Ecology Notes Summer 2011

Thoughts on fire possibilities on Mount Charleston, estimating historical densities of Ponderosa pine in northern AZ, over-understory changes in the Spring Mountains, seeding effectiveness in Red Rock Canyon, workshop announcements

Routine Microsecond Molecular Dynamics Simulations with AMBER on GPUs. 1. Generalized Born

We present an implementation of generalized Born implicit solvent all-atom classical molecular dynamics (MD) within the AMBER program package that runs entirely on CUDA enabled NVIDIA graphics processing units (GPUs). We discuss the algorithms that are used to exploit the processing power of the GPUs and show the performance that can be achieved in comparison to simulations on conventional CPU clusters. The implementation supports three different precision models in which the contributions to the forces are calculated in single precision floating point arithmetic but accumulated in double precision (SPDP), or everything is computed in single precision (SPSP) or double precision (DPDP). In addition to performance, we have focused on understanding the implications of the different precision models on the outcome of implicit solvent MD simulations. We show results for a range of tests including the accuracy of single point force evaluations and energy conservation as well as structural properties pertainining to protein dynamics. The numerical noise due to rounding errors within the SPSP precision model is sufficiently large to lead to an accumulation of errors which can result in unphysical trajectories for long time scale simulations. We recommend the use of the mixed-precision SPDP model since the numerical results obtained are comparable with those of the full double precision DPDP model and the reference double precision CPU implementation but at significantly reduced computational cost. Our implementation provides performance for GB simulations on a single desktop that is on par with, and in some cases exceeds, that of traditional supercomputers

A System Trade Study of Remote Infrared Imaging for Space Shuttle Reentry

A trade study reviewing the primary operational parameters concerning the deployment of imaging assets in support of the Hypersonic Thermodynamic Infrared Measurements (HYTHIRM) project was undertaken. The objective was to determine key variables and constraints for obtaining thermal images of the Space Shuttle orbiter during reentry. The trade study investigated the performance characteristics and operating environment of optical instrumentation that may be deployed during a HYTHIRM data collection mission, and specified contributions to the Point Spread Function. It also investigated the constraints that have to be considered in order to optimize deployment through the use of mission planning tools. These tools simulate the radiance modeling of the vehicle as well as the expected spatial resolution based on the Orbiter trajectory and placement of land based or airborne optical sensors for given Mach numbers. Lastly, this report focused on the tools and methodology that have to be in place for real-time mission planning in order to handle the myriad of variables such as trajectory ground track, weather, and instrumentation availability that may only be known in the hours prior to landing