In this paper, we present the implementation of a Magnetic Resonance Imaging (MRI) simulator on a GRID computing architecture. The simulation process is based on the resolution of Bloch equation [1] in a 3D space. The computation kernel of the simulator is distributed to the grid nodes using MPICH-G2 [2]. The results presented show that simulation of 3D MRI data is achieved with a reasonable co...

The MIAKT project aims to develop collaborative problem solving environments in medical informatics with particular application to the management of breast cancer. This paper presents a framework of image registration Grid services that forms the key components of this project. In this work, the concept of web services was used to encapsulate the registration grid applications for better intero...

1 Spatial differentiation inside database: equidistant grid In this section, f denotes any one of the three components of velocity, magnetic field, or vector potential in the x, y and z directions (ux, uy or uz; bx, by or bz; ax, ay or az), or pressure (p), depending on which function is called. ∆x and ∆y are the width of grid in x and y direction. 1.1 Options for GetVelocityGradient, GetMagnet...

Different stress factors impact power transformers during service. In most cases, the effects of additional direct current (DC) components are not taken into consideration. Nevertheless, this contribution considers DC or quasi-DC components which occur in the German transmission grid (400 kV level). Current measurements are therefore performed at several grounded star points of grid coupling po...

there area lot of mobile computer devices with a variety of applications and users tend to use them more. due to the limitations of mobile devices, running most of the procedures are impossible. to resolve this problem, mobile devices can be connected to the grid, to use the facilities of grid. on the other hand the communication mechanisms are different for each device and they cannot be conne...

A conservative formulation of the Lorentz force is given here for magnetohydrodynamic (MHD) flows at a low magnetic Reynolds number with the current density calculated based on Ohm’s law and the electrical potential formula. This conservative formula shows that the total momentum contributed from the Lorentz force is conservative when the applied magnetic field is constant. For the case with a ...

A high-power, rectangular discharge chamber is being designed by the University of Michigan for operation with multiple discharge cathode assemblies (DCAs). The multiple cathode approach attempts to increase thruster lifetime by operating three DCAs sequentially, possibly providing a threefold increase in discharge life. The baseline multiplecathode discharge chamber (MCDC) magnetic field topol...

In this paper we will discuss the problem of Ultra High Energy Cosmic Rays (UHECR) and show that the idea of a Single Source Model established by Erlykin and Wolfendale (1997) to explain the features seen in cosmic ray energy spectra around the 1015 eV region can be successfully applied also for the much higher energies. The propagation of UHECR (of energies higher than 1019 eV) in extragalacti...

Magnetic susceptibility and specific heat measurements in magnetic fields were performed on an S = 1/2 one-dimensional antiferromagnet KCuGaF6. Exchange interaction was evaluated as J/kB ≃ 100 K. However, no magnetic ordering was observed down to 0.46 K. It was found that an applied magnetic field induces a staggered magnetic susceptibility obeying the Curie law and an excitation gap, both of w...