Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

Near-Field FEM Simulations: A Vital Tool for Studying Silver-Based Plasmonic Systems

R. Asapu [1], S. W. Verbruggen [2], N. Claes [3], S. Bals [3], S. Denys [1], S. Lenaerts [1],
[1] Department of Bioscience Engineering, DuEL Research Group, University of Antwerp, Antwerp, Belgium
[2] Department of Bioscience Engineering, DuEL Research Group, University of Antwerp, Antwerp, Belgium; Center for Surface Chemistry and Catalysis, KU Leuven, Leuven, Belgium
[3] Department of Physics, EMAT Research Group, University of Antwerp, Antwerp, Belgium

Silver nanoparticles are valuable in the field of plasmonics since silver has a higher field enhancement factor compared to other metals that possess plasmonic properties. The plasmonic properties of silver nanoparticles can be finely tuned to the incident light wavelength through their size, shape and dielectric environment, and they have long-term stability. In this work, an ultrathin polymer ...

Flexible Numerical Platform for Electrical Impedance Tomography

A. Fouchard [1], S. Bonnet [1], L. Hervé [1], O. David [2],
[1] University Grenoble Alpes, CEA, LETI, MINATEC Campus, Grenoble, France
[2] Univesité Joseph Fourier, Grenoble Institute of Neuroscience, La Tronche, France

An implementation of the Electrical Impedance Tomography (EIT) forward problem in a generalist FEM package is presented. It fulfils the complete electrode model boundary conditions, combining current injection with contact impedance on a single boundary. Our implementation is benchmarked with the EIDORS FEM library. The Comsol Multiphysics environment proves consistent and provides a flexible ...

MEMS Based Sensor for Blood Group Investigation

M. Kaushik [1], S. Katti [1], V. Saradesai [1], P. Naragund [1], P. Vidhyashree [1], A. K. V. Nandi [1]
[1] B.V. Bhoomaraddi College of Engineering and Technology, Hubli, India

This article describes the design of MEMS based cantilever structure intended for determination of blood group and it is compared with manual method. Cantilever structure design has a sensing layer and when a blood sample comes in contact with this, results in coagulation. The surface tension in turn occurs due to chemical and biological reactions of antigen and antibodies resulting in ...

Skin Variations Impact on Non-Invasive Measurement of Blood Glucose with Interdigital Electrodes

J. Persad [1], S. Rocke [1],
[1] Department of Electrical and Computer Engineering, University of the West Indies, St. Augustine, Trinidad and Tobago

This work aims to investigate the behaviour of a simple interdigital sensor structure for glucose monitoring in response to distortions in the skin-topology and differences in skin undulation during use. The study then extends to consider a flexible sensor structure which is better able to contour to the skin variations. The simulation work shows that skin distortions and undulation ...

Alternate Glucometer Bio-sensor Model based on Ultrasonic MEMS Transceivers

P. Pattnaik[1], S. K. Kamilla [1], Debi Prasad Das[2]
[1]MEMS Design Center, Institute of Technical Education & Research (ITER),Siksha ‘O’ Anushandhan University, Bhubaneswar-751030, Odisha,India
[2]Process Engineering and Instrumentation Cell,Institute of Minerals and Materials Technology (IMMT),Bhubaneswar, Odisha,India

To prevent further complications in diabetes, proper management of blood glucose levels is essential. By using ultrasonic transceivers (both transmit and receive) the glucose level of human blood can be determined. By using this ultrasonic technique miniaturized sensors for non-invasive monitoring blood glucose levels. In this paper Barium Titanate (BT) thin film was used as a transmitter and ...

Nusselt, Rayleigh, Grashof, and Prandtl: Direct Calculation of a User-Defined Convective Heat Flux

J. F. Hansen [1],
[1] Thoratec Corporation, CA, USA

When an electronic device is worn for extended periods, possibly in direct contact with human skin, heat must be safely transferred away from the device, without exceeding standards and regulatory temperature limits on the skin and on the exposed surfaces of the device. Heat transfer is dominated by convective heat transfer to the surrounding air (possibly trapped air under clothing), and by ...

Acoustic Field Comparison of High Intensity Focused Ultrasound Using Experimental Characterization and Finite Element Simulation

J. L. Teja[1], A. Vera[1], L. Leija[1]
[1]Department of Electrical Engineering, Cinvestav-IPN, Mexico D.F., Mexico

High Intensity Focused Ultrasound (HIFU) is used as a noninvasive technique of tissue heating and ablation for different medical treatments. This paper presents a quantitative comparison of HIFU acoustic fields experimentally obtained versus simulated acoustic fields. Acoustic field characterization was realized in two HIFU transducers using water as a propagation medium. Also, simulations were ...

A Non-Newtonian Model for Blood Flow behind a Flow Diverting Stent

G. Mach [1], C. Sherif [2], U. Windberger [3], A. Gruber [3],
[1] Vienna University of Technology, Cerebrovascular Research Group Vienna, Vienna, Austria
[2] Hospital Rudolfstiftung, Cerebrovascular Research Group Vienna, Vienna, Austria
[3] Medical University Vienna, Cerebrovascular Research Group Vienna, Vienna, Austria

Usually, when calculating the blood flow in cerebral arteries and intracranial aneurysms, blood is modeled as a Newtonian fluid, neglecting its shear-thinning behavior. Since flow diverting devices slow down the blood flow in the aneurysm sack, the accuracy of this assumption had to be reviewed. A Carreau Yasuda model is introduced as a non-Newtonian model for blood viscosity. CFD simulations of ...

Simulating Spiking Neurons Using a Simple Mathematical Model

S. Kirigeeganage [1], J. Naber [1], D. Jackson [1], R. Keynton [1], T. Roussel [1],
[1] University of Louisville, Louisville, KY, USA

This paper utilizes COMSOL Multiphysics® software and the Application Builder to simulate neurological responses in nerve axons due to external electrical stimuli. The AC/DC Module of the COMSOL® software is first used to solve the Maxwell's equations. Then the results from the Maxwell's equations are used to drive a second model constructed using global equations using the Global ODE and DAE ...

Computational Modeling and Simulation of the Human Duodenum

B. Hari[1], S. Bakalis[1], P. Fryer[1]
[1]The University of Birmingham, School of Chemical Engineering, Edgbaston, Birmingham, United Kingdom

Worldwide attention in the computational modeling and simulation of the human intestine is increasing in order to help understand its complex behavior and improve health. Computational fluid dynamics is an essential tool to understand the mechanics and transport phenomena of the human intestine, thereby advancing the diagnosis and treatment of gastrointestinal related diseases. The aim of this ...