L. Rossini, O. Chételat, E. Onillon, Y. Perriard
Centre Suisse d’Electronique et Microtechnique – CSEM, Neuchâtel, Switzerland
Ecole Polytechnique Federale de Lausanne - EPFL, Lausanne, Switzerland
The reaction sphere is a magnetic bearing electromagnetic spherical actuator for satellite attitude control. The reaction sphere consists in a 3D motor composed of a 20-coil stator and an 8-pole permanent magnet rotor. The rotor is synthesized wit a mosaic of 728 cylindrical magnets glued on the rotor back-iron so as to approximate the selected magnetization pattern. These cylindrical magnets ...
K. Burkes[1,2], E. Makram, R. Hadidi
Department of Electrical Engineering, Clemson University, Clemson, SC, USA
Savannah River National Lab, R&D Instrumentation, Aiken, SC, USA
COMSOL Multiphysics® software is used to model a water tree in tape shield and concentric neutral cables. It allows for the effect on electric field intensity at the tip of the water tree and electric potential due to the water tree to be better understood. Also, COMSOL is used to calculate the resistance and capacitance of a section of cable with a water tree as it grows across the insulation. ...
University of South Florida, Tampa, FL, USA
A two-dimensional atrial tissue model has been constructed in COMSOL Multiphysics® software to study the propagation of action potential and electrograms. The model presents the atrial electrograms recorded with a mapping catheter. A 2D atrial tissue model is simulated using the Courtemanche et al. cell model equations. PDE in coefficient form was used in COMSOL Multiphysics® to reproduce ...
D. Andrade, and D. Schiffabuer
Pennsylvania Breaker LLC, Canonsburg, PA, USA
Pennsylvania Breaker presents a dielectric stress study for its 72kV class breaker. This study was instrumental in the design and testing procedures during the research and development phase. COMSOL was incorporated into the design pipeline as an important tool for rapid reference of complicated and costly steady state electric cases. The purpose of this study was to develop a robust geometric ...
G. Ha, S. S. Kim, J. H. Kim
Chungnam National University, Daejeon, Korea
Here we aim to advance geomagnetic modeling approaches using COMSOL Multiphysics® software and improve the degree of detail that can be obtained from the measured magnetic field. First, we carried out benchmark tests by comparing the computed results using the widely used analytic solutions for rectangular bodies with arbitrary direction of magnetization with those from the AC/DC Module of ...
Sandia National Laboratories, Albuquerque, NM, USA
We have developed Thor: a pulsed power accelerator for performing dynamic material experiments. The design was aided by using the COMSOL Multiphysics® software with the AC/DC Module and RF Module. Our design process involved optimizing the impedance of the system while maintaining a good margin against electrical breakdown. By using a three-dimensional electromagnetic model of the entire power ...
A. T. Clark
Research & Development, WM Robots LLC, Colmar, PA, USA
Soil’s electromagnetic properties adversely affect the performance of electromagnetic induction (EMI) sensors and if conditions are severe enough, render them useless. A simple circuit model is often used to express the electromagnetic induction response of a target analytically. This analytic model produces a response function that contains unique characteristics based on the target’s ...
The Effect of Space Charge due to the Auto-Ionization of Neutral, Hydrogenic States in Point-Contact Germanium Detectors at MilliKelvin Temperatures - new
D. Faiez, N. Mirabolfathi, B. Sadoulet, K. M. Sundqvist
Department of Physics, University of California - Berkeley, Berkeley, CA, USA
Department of Electrical & Computer Engineering, Texas A&M University, College Station, TX, USA
A class of semiconducting detectors, operated at temperature T~50mK, has direct application to the search for dark matter particle, when are able to simultaneously measure both the ionization and phonons created by particle interactions. We explore the effect of space charge accumulation in a germanium p-type point contact detector which arises due to the auto-ionization of hydrogenic ...
A. Jeremic, E. Khoshrowshahli
Electrical & Computer Engineering, McMaster University, Hamilton, ON, Canada
Biomedical Engineering, McMaster University, Hamilton, ON, Canada
Although cardiac arrest may be statistically insignificant event financial and more important emotional costs in such cases are quite devastating. In this paper we study the effects of multiple grounding pads. Namely, we believe that by placing multiple pads in the lower abdominal part we would be able to decrease the current density that would be dissipated to fetus and amniotic liquid. ...
Estimation of Hydraulic Conductivity for a Heterogeneous Unsaturated Soil Using Electrical Resistivity and Level-Set Methods - new
T. K. Chou, M. Chouteau, J. S. Dubé
École Polytechnique de Montréal, Montréal, QC, Canada
École de Technologie Supérieure, Montréal, QC, Canada
The estimation of the soil saturated hydraulic conductivity (Ks) is crucial in understanding water flow and transport of contaminants. There are many hydrological techniques available in determining this parameter (constant head method, in-situ soil analysis, etc...). While these techniques can provide quality data points, they are often limited by sparse data sampling and scale. Therefore ...