Particle-based and Meshless Methods with Aboria

Aboria is a powerful and flexible C++ library for the implementation of particle-based numerical methods. The particles in such methods can represent actual particles (e.g. Molecular Dynamics) or abstract particles used to discretise a continuous function over a domain (e.g. Radial Basis Functions). Aboria provides a particle container, compatible with the Standard Template Library, spatial search data structures, and a Domain Specific Language to specify non-linear operators on the particle set. This paper gives an overview of Aboria's design, an example of use, and a performance benchmark

Diffusion of particles with short-range interactions

A system of interacting Brownian particles subject to short-range repulsive potentials is considered. A continuum description in the form of a nonlinear diffusion equation is derived systematically in the dilute limit using the method of matched asymptotic expansions. Numerical simulations are performed to compare the results of the model with those of the commonly used mean-field and Kirkwood-superposition approximations, as well as with Monte Carlo simulation of the stochastic particle system, for various interaction potentials. Our approach works best for very repulsive short-range potentials, while the mean-field approximation is suitable for long-range interactions. The Kirkwood superposition approximation provides an accurate description for both short- and long-range potentials, but is considerably more computationally intensive

Apples to Apples: Special Needs Education in the United States and Denmark

This comparative case study is designed to uncover varying approaches to teaching students with special needs based on the perceptions and practices of teachers. A closer look is made into the specific experiences of educators that resulted in Learner-Centered approaches to curriculum and instruction. Data was collected through published documents, questionnaires, and interviews of teachers who instruct students with special needs in the United States and Denmark. In the United States, data from educators in a private specialized education program in Georgia was used to compare data from public education teachers in a Danish Municipality. The study builds on current global special needs education research concerning teacher perspectives of the special education system, their use of Learner-Centered philosophies and practices, and historical perspectives of the special education system. There is little comparative research that connects teachers\u27 perceptions of the issues of equity in the special needs\u27 education field and their ability to combat those inequalities with practice. The purpose of this study is to reveal the similarities that exist in the two systems adding to the body of research that provides motivations and practices for equitably teaching students with special needs. Implications of the study support adapting individualized, non-traditional, learner-centered approaches to teaching special needs students based on similar successes in the United States and Denmark

Evolution of the Olympus Mons Caldera, Mars

Extensive high-resolution (15 to 20 m/pixel) coverage of Olympus Mons volcano permits the investigation of the sequence of events associated with the evolution of the nested summit caldera. The sequence of the intra-caldera events is well illustrated by image data collected on orbits 473S and 474S of Viking Orbiter 1. These data cover both the oldest and youngest portions of the caldera floor. The chronology inferred from the observations is presented which in turn can be interpreted in terms of the internal structure of the volcano (i.e., magma chamber depth and the existence of dikes)

Integration of Holonomic Thinking in Educational Leader-ship Development Courses

Educational leaders are prime observers of their school performance and progress. As leaders and active participants in the steps towards school improvement, they must take into consideration diverse stakeholders’ opinions, ideas and beliefs, and technical aspects such as data analysis while engaging in the decision-making process. This practice can be enhanced by considering the circumstances and all stakeholders involved from a holonomic viewpoint rather than an egocentric viewpoint. This article explores the holonomic conceptual platform and its strategies as a conduit to broaden emergent school leaders’ perspectives

Wellbeing, developmental crisis and residential status in the year after graduating from higher education: a 12-month longitudinal study

Graduating from higher education is characterized by a complex set of changes, including the transition into employment as well as residential changes and identity shifts. We explored how wellbeing and depressive symptoms are associated with retrospective appraisals of developmental crisis in the year after leaving university, and the impact of living with parents following graduation. Data were collected from graduates based in the UK over the course of the 12-months following completing an undergraduate degree, via a 3-phase longitudinal design. One third of the sample reported experiencing a developmental crisis within the year following university. Those who reported a crisis scored significantly lower on measures of environmental mastery across all time points and higher on measures of depression. Those living with parents scored significantly lower on measures of self-acceptance and autonomy and higher on measures of depression. In light of these findings, we conclude that interventions and targeted support to help students manage the psychological challenges of life after university should be developed and implemented

Acid Polishing of Lead Crystal Glass

The industrial partner manufactures high quality lead crystal glassware. The cutting of decorative features in the glass damages the surface and the cuts are optically opaque; to restore transparency, the glass is polished in a solution of hydrofluoric (HF) and sulphuric acid (H2 SO4 .) The polishing process comprises three stages: 1. immersion in a polishing tank containing acid; 2. rinsing in a tank containing water; and 3. settlement of the solid reaction products in a settlement tank. The manufacturer hopes to optimise its polishing process to • minimise the health/environmental impact of the process; • maximise throughput; • maintain the sharpness of the cut edges while still polishing to an acceptable level of transparency. The study group was asked to focus on modelling three aspects of the process: • the chemical reactions involved in the etching at the glass-acid solution interface; • the removal of reaction products in the settlement tank; • flow within the polishing tank

The hydro-morphological index of diversity: a tool for describing habitat heterogeneity in river engineering projects

We present a new hydro-morphological index of diversity (HMID), a tool aimed for use in river engineering projects and firstly developed at gravel-bed streams in Switzerland, but intended for a broader use. We carried out field work with extensive hydraulic and geomorphic data collection, conducted correlation analysis with hydro-morphological variables, formulated the HMID, and analyzed the correlation between HMID and a visual habitat assessment method. The HMID is calculated by means of the coefficient of variation of the hydraulic variables flow velocity and water depth, which have been demonstrated to sufficiently represent the hydro-morphological heterogeneity of alpine gravel-bed stream reaches. Based on numerical modeling, the HMID can be calculated easily for a comparison of different alternatives in river engineering projects and thus achieves predictive power for design decisions. HMID can be applied at a reach-related scale in engineering programs involving geomorphic measures that aim at the enhancement of habitat heterogeneity of a stream. However, the application of HMID has to be integrated with evaluations of the long-term streambed evolvements that are considered at a catchment scale and strongly related to the sediment regime of the stream under stud

Penerapan Model Pembelajaran Discovery Learning Untuk Meningkatkan Hasil Belajar IPS Siswa Kelas V SDN 104181 Sunggal Kanan

Tujuan Pengabdian kepada Masyarakat ini adalah Untuk mengetahui penerapan model pembelajaran Discovery Learning dalam menngkatkan hasil belajar IPS siswa kelas V SDN 104181 Sunggal Kanan. Responden dalam Pengabdian kepada Masyarakat ini adalah 52 siswa yang terdiri dari 2 kelas yaitu kelas VA yang berjumlah 27 siswa yang terdiri dari 11 laki laki dan 16 perempuan dan kelas VB yang berjumlah 25 siswa yang terdiri dari 13 laki laki dan 12 perempuan. Pengamdian Kepada Masyarakat ini dilaksanakan selama dua minggu yang terdiri dari enam pertemuan untuk menerapkan model pembelajaran Discovery Learning umtuk meningkatkan hasil belajar IPS siswa kelas V SDN 104181 Sunggal Kanan. Tes yang digunakan adalah test pilihan berganda yang terdiri dari 25 pertanyaan. Setelah menerapkan model pembelajaran Discovery Learning pada siswa kelas V SDN 104181 Sunggal Kanan maka dapat dismpulkah bahwa model pembelajaran discovery learning dapat meningkatkan hasil belajar IPS siswa kelas V SDN 104181 Sunggal Kanan