Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Simulation of a Magnetic Induction Method for Determining Passive Electrical Property Changes of Human Trunk Due to Vital Activities

H. Mahdavi[1], J. Rosell Ferrer[1]
[1]Universitat Politècnica de Catalunya, Barcelona, Spain

The human body consists of many different types of tissues each with specific passive electrical properties. Vital activities lead to a characteristic change of these properties and geometrical changes. Magnetic induction is a non-contact method which can be used to determine these changes. The method is based on the creation of a primary magnetic field that will produce eddy currents in the ...

Microwave Inactivation of Bacteria Under Dynamic Heating Conditions in Solid Media

S. Curet[1], M. Mazen Hamoud-Agha[1]
[1]GEPEA, UMR 6144, CNRS, ONIRIS, Université de Nantes, Nantes, France

In this study, COMSOL®4.2a is used to model a microwave heating process in a TE10 rectangular waveguide. The sample consists of a small cylindrical Ca-alginate gel (D = 8 mm, H = 10 mm) inoculated with bacteria Escherichia Coli K12. The sample is placed along the microwave propagation direction into the waveguide. Maxwell’s equations and heat transfer are coupled to a microbial inactivation ...

Human Torso Model for Heat Transfer Analysis

X. Xu[1], T. Patel[1], R.W. Hoyt[1]
[1]U.S. Army Institute of Environmental Medicine, Natick, MA, USA

A human torso model was created for heat transfer analysis. The torso was derived from the ‘Virtual Family’ whole-body voxel data from the ITIS Foundation (Zurich, Switzerland). Measurements were taken from the ITIS male along the axial plane at key anatomical landmarks and used to develop geometry in Solidworks. Individual components were created to represent the skin, fat, muscle, and bone ...

Microwave Exposure System for In Vitro and In Vivo Studies - new

C. Nadovich[1, 2], W. D. Jemison[2], J. A. Stoute[3], C. Spadafora[4]
[1]Lafayette College, Easton, PA, USA
[2]Clarkson University, Potsdam, NY, USA
[3]Pennsylvania State University, Hershey, PA, USA
[4]INDICASAT AIP, Ciudad del Saber, Panama

A computer controlled microwave exposure system and specialized applicators were constructed for the purpose of facilitating accurate observations of microwave radiation effects on uninfected and infected biological tissue in vitro and in vivo under different electromagnetic modalities and exposure configuration. To address diverse requirements, three different applicators were developed: a ...

Detection of E.coli Cell using Capacitance Modulation

A.K. Dwivedi, R.M. Patrikar, R.B. Deshmukh, and G. Pendharkar
Visvesvaraya National Institute of Technology, Nagpur, Maharashtra, India

Testing and verification is very important to increase reliability of a system. In water analysis its purity is verified using different test methods. Biosensors are very useful to detect the microorganisms present in water. This paper presents a method to detect E.coli bacteria in water depending upon the capacitance modulation in the presence and absence of E.coli cell, which is simulated in ...

Comparison of Computational Methods for the Estimation of the Dielectrophoretic Force Acting on Biological Cells and Aggregates in Silicon Lab-on-chip

S. Burgarella[1], F. Maggioni[2], and G. Naldi[2]
[1]STMicroelectronics, Agrate Brianza, Milan, Italy
[2]Department of Mathematics, University of Milan, Milan, Italy

Dielectrophoresis is a method for cell manipulation in miniaturized devices exploiting the dielectric properties of cells and/or cellular aggregates suspended in a fluid and subjected to a high-gradient electric field. The mathematical expression of the force is obtained by a multipole expansion whose terms involve increasing power of the particle\'s radius. Three methods for the expression ...

3-Dimensional Blood Cooling Model inside a Carotid Bifurcation

R. Sikorski[1], T. Merrill[1]
[1]Rowan University, Glassboro, NJ, USA

Stroke is caused by an interruption of brain blood supply and is one of the leading causes of death and disability. A mild reduction of 2-5°C in tissue temperature through hypothermia has shown reduced tissue infarct size, increased tissue recovery, and positive neurological effects. This paper seeks to predict the outlet blood temperature in the common carotid bifurcation branches. In our ...

Electrical Response and Thermal Damage Assessment of Cutaneous and Subcutaneous Tissues to Noninvasive Radiofrequency Heating: A Computational Modeling Study

A. González-Suárez[1,2], J. N. Jimenez-Lozano[3], W. Franco[1]
[1]Wellman Center for Photomedicine, Massachusetts General Hospital & Harvard Medical School, Boston, MA, USA
[2]Biomedical Synergy, Electronic Engineering Department, Universitat Politècnica de València, Valencia, Spain
[3]ZELTIQ Aesthetics, Inc., Pleasanton, CA, USA

Electromagnetic radiofrequency (RF) sources are widely used to heat up cutaneous and subcutaneous tissues. The subcutaneous morphology of tissue consists of a fine, collagenous and fibrous septa network enveloping clusters of adipocyte cells; however, it is commonly regarded as a homogeneous fat layer in computational models. In the present study the objective is to assess the effect of the ...

Analysis of Heat Transfer in a Complex Three Dimensional Structure Fabricated by Additive Manufacturing - new

C. Settle[1], K. Hoshino[1]
[1]Biomedical Engineering Department, University of Connecticut, Storrs, CT, USA

The goal of this study was to create a three dimensionally designed biomedical device with multiple functionalities and analyze its simulated heat transfer. The device would be fabricated through additive manufacturing; specifically electron beam melting (EBM). EBM has a feature size constraint of 1 mm (acceptable for this design) and is only capable of manufacturing titanium alloys [2]; a ...

Design of Multiple Ground System for Maternal Defibrillation - new

A. Jeremic[1], E. Khoshrowshahli[2]
[1]Electrical & Computer Engineering, McMaster University, Hamilton, ON, Canada
[2]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 ...