Aqui você encontrará apresentações realizadas nas Conferências de Usuários COMSOL de todo o mundo. As apresentações englobam pesquisas e produtos inovadores feitas por engenheiros e cientistas usando o COMSOL Multiphysics. Os tópicos abrangem uma grande gama de indústrias e aplicações, como elétrica, mecânica, escoamento e química. Use a função de busca "Quick Search" para encontrar apresentações na sua área de interesse.

Design and Strain Analysis of Artificial Femoral Head and Stem

N. M. Sundaram[1], M. Sneha[1], A. Kandaswamy[1], R. Nithya[2]
[1]PSG College of Technology, Coimbatore, Tamil Nadu, India
[2]Dr. N.G.P. Institute of Technology, Coimbatore, Tamil Nadu, India

The majority of elderly patients are subjected to hip bone replacement due to dislocation of bone, mechanical failure and infection. The life time of the implant varies from patient to patient depending on their daily physical activity. Once the implant fails, re-operation of hip bone replacement is performed. In United States, there are approximately 18 revision hip replacements performed for ...

血管对肿瘤的光热疗法的影响

吴淑莲 [1], 李晖 [2], 李志芳 [2],
[1] 福建师范大学,福州,中国
[2] 福建师范大学,福州,中国

引言:激光诱导间质肿瘤热疗法是一种可使生物组织局部地方凝结坏死的肿瘤疾病治疗方法,目前已经用于肝、脑等各部位的肿瘤治疗[1-2]。为了更好地进行肿瘤疾病的治疗,需要实时地对组织的温度和热损伤进行监控,而检测技术很难实现对肿瘤治疗过程的实时监测,故数值计算成为研究光热疗法的有力工具[2-6]。本模型将生物组织光传输的物理场与热传输的物理场相耦合,考虑组织光热参数随温度变化的情况,研究了肿瘤周围含有大动脉的情况时组织的温度分布随时间的变化情况,研究结果对指导临床医学肿瘤治疗有重要意义。 COMSOL Multiphysics® 的软件使用: 几何模型:如图1所示,圆柱代表光源,圆形区域代表肝脏肿瘤,弯曲圆柱代表大血管,大正方体代表肝脏。 PDE 接口和生物传热接口,选择生物组织的热损伤。 结果: 如图2,图3所示,在加热过程中,开始时血管对温度分布几乎无影响,但是随着加热时间变长 ...

Comparison of Finite Element and Monte Carlo Simulations for Inhomogeneous Advanced Breast Cancer Imaging

Y. Xu, and Q. Zhu
University of Connecticut, Storrs, CT, USA

Three-dimensional FEM method provided by COMSOL is used to model an inhomogeneous advanced breast tumor of different optical properties for outer layer and inner core in a semi-infinite medium. The running time of FEM by COMSOL for one source and 14 detectors is 17.658s and which of Monte Carlo (MC) is 91017s, 5154 times longer. The absorption distribution is reconstructed by born approximation. ...

Generation of Lofted NURBS Curves for 3D Model Generation with COMSOL Multiphysics®

R.T. Hart[1]
[1]Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA

A key challenge to finding quantitative solutions to biological problems is to model the complex 3D geometry of naturally occurring structures. Model generation often starts from serial sections from CT or MRI scans, confocal microscopy, or physical sectioning. In addition, prior to V4 of COMSOL Multiphysics®, there was a "loft" command to allow construction of 3D models from serial sections ...

Modeling of Retinal Electrical Stimulation Using a Micro Electrode Array Coupled with the Gouy-Chapman Electrical Double Layer Model to Investigate Stimulation Efficiency

F. Dupont, R. Scapolan, C. Condemine, J.F. Bêche, M. Belleville, and P. Pham
CEA, LETI, Minatec, Grenoble, France

The electrical stimulation for retinal implant has known significant improvements in the last decades with many implantations and experimentations. The ability to create better controlled and adapted signals to increase the efficiency in stimulation is a major objective. The aim of this study is to develop a numerical platform based on COMSOL Multiphysics to simulate different waveforms. The ...

Singlet Oxygen Modeling of BPD Mediated-PDT Using COMSOL

T.C. Zhu[1], B. Liu[1], X. Liang[1]
[1]University of Pennsylvania, Philadelphia, PA, USA

Singlet oxygen (1O2) is the major cytotoxic agent during photodynamic therapy (PDT). A previously developed model that incorporates the diffusion equation for the light transport in tissue and the macroscopic kinetic equations for the generation of the singlet oxygen, can be used to numerically calculate the distance-dependent reacted 1O2 using finite-element method (FEM). The formula of reacted ...

Electric Field Density Distribution for Cochlear Implant Electrodes

N.S. Lawand[1], J. van Driel[2], P.J. French[2]
[1]Electronic Instrumentation Laboratory (EILab), Faculty of Electrical Engineering, Mathematics and Computer Science (EEMCS), Delft University of Technology, Delft, The Netherlands
[2]Delft University of Technology, Delft, The Netherlands

Cochlear Implants are implantable devices which bypasses the non-functional inner ear and directly stimulates the hearing nerve with electric currents thus enabling deaf people to experience sound again. Implant electrode array design is limited in electrode count, due to their large size in accordance to scala tympani (ST) with restrictions for deeper insertion in ST thus depriving access to ...

Prediction of Time of Death Using a Heat Transport Model

J.L. Smart[1], and M. Kaliszan[2]
[1]University of Kentucky, Paducah, KY, USA
[2]Medical University of Gdansk, Gdansk, Poland

COMSOL Multiphysics® 4.0 was used to study conductive and convective heat transfer from the human eyeball to the surrounding air. Postmortem temperature decay curves were collected in eyeballs of numerous human corpses. Of course, these curves represent only a portion of the complete temperature decay curve, since the pathologist is able to start collecting temperature data only after some ...

Evaluation of Binary Mixture Models for 3D Printed Biosensors

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

3D printing as applied to the area of electronics manufacture covers a broad range of traditional printing technologies [1]. The attraction in 3D printing lies in its potential to disrupt the traditional photolithographic/subtractive manufacturing line with simpler additive processes. Additive electronics manufacturing which utilises 3D printing techniques allow for fewer production steps and ...

A Method for Efficient Calculation of Diffusion and Reactions of Lipophilic Compounds in Complex Cell Geometry

Kristian Dreij[1], Qasim Ali Chaudhry[2], Bengt Jernström[1], Ralf Morgenstern[1], and Michael Hanke[2]
[1]Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
[2]School of Computer Science and Communication, Royal Institute of Technology, Stockholm, Sweden

A general description of effects of toxic compounds in mammalian cells is facing several problems. Firstly, most toxic compounds are hydrophobic and partition phenomena strongly influence their behaviour. Secondly, cells display considerable heterogeneity regarding the presence, activity and distribution of enzymes participating in the metabolism of foreign compounds i.e. bioactivation ...