A. Paoli, L. Seminara, D.D. Caviglia, A. Garibbo, and M. Valle
Department of Biophysical and Electronic Engineering, University of Genova, Genova, Italy
SELEX Communications S.p.A., Genova, Italy
Gas sensor arrays based on metal oxides operating at high temperature are commonly used in many application fields. They can operate on different principles and each sensor may show very different responses to the individual gases in the environment. Data coming from the array can be merged for reliable gas detection. One point which is common to the different sensors types is that the ...
CEA Valduc, France
During the welding of tantalum with a ND: YAG pulsed laser, a deep and narrow cavity, called the keyhole, is formed. At the end of the process, surface tension forces provoke the collapse of the keyhole. For important interface deformations, gas bubbles can be trapped into the melting pool. If the solidification time is insufficient, these bubbles give birth to residual porosities. The aim of ...
O. Vogel, and J. Ulm
Proportional solenoids are well-known and used in a wide range of applications today. This paper is about methods of influencing the characteristic force-stroke-curves of magnetic actuators by means of different pole geometries. The conical design of the stator pole which is mostly used to accomplish proportional solenoids is analyzed by both a simple analytic reluctance model and a FEM model ...
N. Katte, J. Haus, J.B. Serushema, and M. Scalora
University of Dayton, Dayton, OH, USA
Charles M. Bowden Research Center, Redstone Arsenal, AL, USA
We show that diffraction can be suppressed in a one-dimensional metallodielectric stack (MDS) at visible wavelengths to achieve super-resolution imaging. In our calculations we use two popular techniques, which can be adapted to investigate the imaging properties of MDSs. The two methods are the transfer matrix method (TMM) and the Finite element method based software, COMSOL Multiphysics. The ...
Time-Resolved Optical Tomography in Preclinical Studies: Propagation of Excitation and Fluorescence Photons.
F. Nouizi, R. Chabrier, M. Torregrossa, and P. Poulet
Laboratoire d’Imagerie et de Neurosciences Cognitives, Straßbourg, France
Laboratoire des Sciences de l'Image, de l'Informatique et de la Télédétection, France
We present time-resolved methods that rely on near-infrared photons to image the optical properties and distribution of fluorescent probes in small laboratory animals. The coupled diffusion equations of excitation and fluorescence photons in highly scattering tissues were solved using the three-dimensional Finite Element Method (FEM) provided by COMSOL. The computed results allowed to yield ...
G. R. Prakash, K. M. V. Swamy, S. Huddar, B. G. Sheeparamatti, Kirankumar B. B.
Basaveshwar Engineering College, Bagalkot, Karnataka, India
The focus of this paper is to study the effect on resonance frequency and power enhancement techniques of piezoelectric MEMS and modeling, design, and optimization of a piezoelectric generator based on a two-layer bending element(Figure 1) using COMSOL Multiphysics. An analytical relation was developed based on the shift in resonance frequency(Figure 2) caused by the addition of a thin film ...
Solution of Inverse Thermal Problem for Assessment of Thermal Parameters of Engineered H2 Storage Materials
I. Fedchenia, and B. van Hassel
United Technologies Research Center
East Hartford, CT
Materials based H2 storage systems for light duty vehicles need to meet challenging performance targets that have been developed by the FreedomCAR and Fuel Partnership. On-board reversible metal hydrides are typically integrated with heat transfer surfaces, e.g. in fin and tube heat exchangers, in order to reject the heat of H2 absorption at a high rate which is set by the refueling time ...
Investigation of the Effect of Spinal Defects on Spondylolysis and Stress Fracture of Vertebral Bodies
M.S. Yeoman, C. Quah, A. Cizinauskas, K. Cooper, D. McNally, B. Boszczyk
Continuum Blue, Tredomen, Ystrad Mynach, United Kingdom
The Centre for Spinal Studies and Surgery, Queen’s Medical Centre, Nottingham, United Kingdom
Bioengineering Research Group, Faculty of Engineering, The University of Nottingham, Nottingham, United Kingdom
Spondylolysis (SL) is a defect of the spinal vertebra, and is typically caused by stress fracture of the pars interarticularis bone of the vertebral arch. It is especially common in adolescents who over train in sporting activities. Spina bifida occulta (SBO) is a malformation of the spine where the protruding vertebral bodies are not fully formed. In this study we demonstrate the predisposition ...
A. Gizzi, C. Cherubini, S. Migliori, and S. Filippi
Nonlinear Physics and Mathematical Modeling Lab, Engineering Faculty, University Campus Bio-Medico, Roma, Italy
International Center for Relativistic Astrophysics, University of Rome La Sapienza, Roma, Italy
Alberto Sordi Foundation, Research Institute on Aging, Roma, Italy
Postoperative or paralytic Ileus (PI) is a temporary aftermath of major abdominal surgeries. PI prevents the passage of food throughout the lumen leading to bloating, distension, emesis and pain. A plausible mathematical model for this phenomenology physiologically fine tuned including thermal variations, is presented here. Using COMSOL Multiphysics the existing intestinal ionic model have been ...
A. Weddemann, and V. Thümmler
Bielefeld University, Germany
ALE-methods are frequently used to solve systems of partial differential equations (PDEs) on moving domains. The main idea of these methods is to incorporate the time evolution of the domain into the equations. However, the motion of the domain with respect to time induces convective fluxes in the resulting equations. These can lead to stability problems of the numerical method if they become ...