662 research outputs found
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No full textPoznańThe three-dimensional coupled quasi-static problem of linear thermoelasticity is presented. The concept is based on a spatial extension of a region occupied by the considered body and on spatial formulation of a new fictitious load. All the outside objects are termed here fictitious ones. The solution of the initial-space value problem includes fictitious displacement-temperature components. Capacity values of approximate fictitious components are calculated from a boundary condition contracted to the finite time interval. The approximate solution to the primary thermoelastic problem is obtained by contracting in space the approximate solution to the initial-space value problem. It enables us to determine the thermoelastic flow
No full textPoznańIn this paper an inelastic collision of two rigid bodies is considered. Friction forces between contacting surfaces of both objects are taken into considerations. The Routh method is applied to obtain the solution and to analyse the collision process. The kinematic state of both bodies after the collision is calculated, and computer simulations of collision are performed
No full textPoznańExperimental stations in facilities like Synchrotrons and Free Electron Lasers produce very large data sets. With access to distributed computing paradigms and Grid infrastructures, the data are processed on-line. This requires considerable computing power and storage requirements. Moreover, the constant advances in sensors, detectors, and light source technologies yield frequent upgrades of the instrumentation and proportional increase of the computing requirements. Other than the computing needs, a key-point for successful experiments is the efficient collaboration between the involved scientists and their convenient access to the research facilities. A viable solution is developing suitable infrastructures that allow remote operation of the experimental facilities. We focus on the importance of the transparent integration of instruments in the traditional Grid. Such capability boosts further the concept of remote operation, on-line & off-line processing, and builds collaborative and distributed virtual research environments. Building on the foundations of previous European projects, the aim of DORII (Deployment of Remote Instrumentation Infrastructure) [1] is to develop and operate an infrastructure that addresses this issue and supports multiple activities of eScience. We will describe how we have applied the DORII infrastructure on remote operations and on-line & off-line processing in a synchrotron radiation facility
No full textPoznańThe Center for Computational Science (CCS) of the US Naval Research Laboratory (NRL) conducts leading edge research in High Performance Computing. CCS currently has two SGI Altix 3700s, one Altix 4700, and one SGI ICE machine. Recently the center has seen an increased interest from scientists at NRL who have been running MatLab™ on their local PC's and workstations but who need more computational power. One such application is the development of biological warfare point detection sensors where time-to solution for a single run can take over 30 hours to complete and many runs are necessary during the development process. This paper describes the issues that were encountered in the port of this code to the SGI High Performance Computing (HPC) computers at NRL and provides a paradigm for moving other computationally intensive MatLab™ programs to HPC machines
