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Modelling of Seismoelectric Effects

B. Kröger[1], U. Yaramanci[2], and A. Kemna[1]
[1]1 University of Bonn
[2]GGA Hannover

We present the results of full-waveform time-dependent finite-element modelling of coupled seismoelectromagnetic wave propagation in fluid-saturated porous media. To describe the seismoelectric response of the system a new set of equations is developed which couple the poroelasticity theory and Maxwell’s equations via flux/force transport equations in a thermodynamical sense. The coupling ...

Finite Element Modeling of Dielectric-Paraelectric Composite Materials

K. Zhou, S. Alpay, and S. Boggs
Institute of Material Science, University of Connecticut, Storrs, CT, USA

Finite Element analysis is used to model 2-D and 3-D paraelectric-dielectric composites (BaTiO3 spherical fillers randomly distributed in constant dielectric matrix). The effective dielectric response and tunability are studied under different filler sizes and different volume fractions. The results are consistent with previous theoretical and experimental results: with the increasing of filler ...

Temperature Excursions at the Pulp-Dentin Junction during the Curing of Light-Activated Dental Restorations

M. Jakubinek[1,2], C. Neill[1], C. Felix[3], R. Price[2,3], M. White[1,2]

[1]Departments of Chemistry and Physics, Dalhousie University, Halifax, NS, Canada
[2]Institute for Research in Materials, Dalhousie University, Halifax, NS, Canada
[3]Department of Dental Clinical Sciences, Dalhousie University, Halifax, NS, Canada

Heat produced during the curing of light-activated dental restorations could damage the dental pulp. Given the prevalence of composite restorations and the importance of avoiding injury to the pulp, efforts should be made to minimize the temperature increase that occurs at the pulp-dentin junction during light-curing. In this investigation we develop and evaluate a COMSOL Multiphysics FEM tooth ...

COMSOL in a New Tensorial Formulation of Non-Isothermal Poroelasticity

A. Mario-Cesar Suarez[1], and V. Fernando Samaniego[2]

[1]Faculty of Sciences, Michoacan University, Morelia, Mich., Mexico
[2]Faculty of Engineering, National University of Mexico, Mexico City, Mexico

The presence of a moving fluid in a porous rock modifies its mechanical response. Poroelasticity explains how the fluid inside the pores bears a portion of the total load supported by the rock. The remaining part of the load is supported by the elastic skeleton, which contains a laminar fluid coupled to the framework by equilibrium and continuity conditions. This work introduces an original ...

Modeling of Nerve Stimulation Thresholds and Their Dependence on Electrical Impedance with COMSOL

P. Krastev[1], and B. Tracey[1]
[1]Neurometrix, Inc., Waltham, Massachusetts, USA

Nerve localization is important for applications in regional anesthesia. Localization is achieved by stimulating the nerve with an electric field produced by a current from a needle inserted into the body of the patient, close to the target nerve.  Modeling of the electric field in close proximity to the nerve may help to explain observed variations in threshold currents and can help to ...

Modeling Interface Response in Cellular Adhesion

G. Megali[1], D. Pellicanò[1], M. Cacciola[1], F. Calarco[1], D. De Carlo[1], F. Laganà[1], and F.C. Morabito[1]

[1]DIMET Department, Faculty of Engineering, University “Mediterranea” of Reggio Calabria, Reggio Calabria, Italy

Constitutive properties of living cells are able to withstand physiological environment as well as mechanical stimuli occurring within and outside the body. We examined fluid flow and Neo-Hookean deformation related to the rolling effect. A mechanical model to describe the cellular adhesion with detachment is here proposed. We developed a finite element analysis, simulating blood cells attached ...

A Semplified Model for the Evolution of a Geothermal Field

L. Meacci[1], A. Farina[1], F. Rosso[1], I. Borsi[1], M. Ceseri[1], and A. Speranza[1]

[1]Dipartimento di Matematica U. Dini, Università degli Studi di Firenze, Firenze, Italy

The problem is to understand how a geothermal field can evolve from a water dominated state into a vapor dominated one. A first answer to this question is given by a simplified mathematical model of the dynamics of a geothermal field in which the geothermal fluid is entirely composed by pure H2O. We considered a 1-D geometry and we developed a dynamic model that presents a clear interface ...

Variable Capacitance And Pull-In Voltage Analysis Of Electrically Actuated Meander-Suspended Superconducting MEMS

N. AlCheikh[1], P. Xavier[1], J.M. Duchamp[1], C.H. Boucher[2], and K. Schuster[2]
[1]Institute of Microelectronics, Electromagnetism and Photonics (IMEP-LAHC), Minatec, Grenoble, France
[2]Institute of Millimetric Radio Astronomy (IRAM), Grenoble, France

Variable capacitors between the fF and pF range are very interesting for high frequency applications like variable filters, resonators, etc. For radio astronomy applications variable capacitors, realized by electrostatically actuated, micromechanical Meanders-suspended bridges (MEMS) made of superconducting Niobium, have been measured to find C(V). A non plane capacitance behavior have been ...

Cryogenic Design for the SAFARI Test-Setup Calibration Source

C. de Jonge[1], M. Eggens[1], W. Laauwen[1], P. Dieleman[1], G. Keizer[1]
[1]SRON Netherlands Institute for Space Research, Utrecht, The Netherlands

For the SAFARI Imaging Spectrometer, part of the SPICA satellite payload, a Calibration Source is under development. Challenges in the design include the low cooling power (few mW) available at cryogenic temperatures. COMSOL Multiphysics® simulations were used extensively in the design process of the calibration source, allowing optimization of the thermal, electro-magnetic and mechanical ...

Optimization of a Rotor Shape for Spherical Actuator with Magnetically Levitating Rotor to Match Octupole Field Distribution

M. Sidz[1], R. Wawrzaszek[1], L. Rossini[2], A. Boletis[3], S. Mingard[3], K. Seweryn[1], E. Onillon[2], M. Strumik[1]
[1]Space Research Centre of PAS, Warsaw, Poland
[2]CSEM Centre Suisse d’Electronique et de Microtechnique SA, Neuchâtel, Switzerland
[3]Maxon Motor AG, Sachseln, Switzerland

The use of a reaction sphere as an actuator used by satellite Attitude Control System was proposed over twenty years ago. In principle this concept assumes the use of a single reaction sphere which can be accelerated in any direction instead of a set of reaction wheels. The solution discussed in this work has been proposed and patented by CSEM company. Contrary to conventional ball bearing ...