scholarly journals Simulation of Impedance Measurements at Human Upper Arm within 10 KHZ to 1 MHZ with the Vary of Fat Layers from 10MM to 25MM

10.29007/rz1b ◽  
2020 ◽  
Author(s):  
Minh Hiep Do Tran ◽  
Phuong Vi Ngo ◽  
Quang Linh Huynh ◽  
Thuy Nguyen Nhu Son
Keyword(s):  
Output Voltage ◽  
3D Model ◽  
Simulation Analysis ◽  
Dielectric Behavior ◽  
Comsol Multiphysics ◽  
The Finite Element Method ◽  
Applied Current ◽  
Upper Arm ◽  
Impedance Measurements ◽  
Fat Thickness

The work presents a simulation analysis of the bioimpedance at the human upper arm using the finite element method (FEM). Comsol Multiphysics has been used to create the 3D model with four domains of dielectric behavior: skin, fat, muscle, and bone. The main objective of this paper is to study the effect of the fat thickness and frequency on three parameters: resistance, reactance, and phase. The impedance values were calculated as the ratio of the output voltage at the electrodes and the applied current (1 mA). The measurements were done at four different values of the fat layer (10mm, 15mm, 20mm, and 25mm) and the electrical properties of the upper arm were used. The results clarify that the fat layer has a significant impact on the upper arm impedance across the frequency spectrum, resistance, and phase appear to be more affected than reactance.

scholarly journals Simulation of impedance measurements at human forearm within 1 kHz to 2 MHz

2019 ◽  
Vol 7 (1) ◽  
pp. 20-27 ◽  
Author(s):  
Gautam Anand ◽  
Andrew Lowe ◽  
Ahmed M. Al-Jumaily
Keyword(s):  
High Frequency ◽  
Simulation Analysis ◽  
Electrical Response ◽  
Dielectric Behavior ◽  
Cole Plot ◽  
Frequency Range ◽  
Impedance Measurements ◽  
High Frequency Structure Simulator ◽  
Human Forearm ◽  
Different Diameters

Abstract This work presents a simulation analysis of the bioimpedance measurements at the human forearm. The Ansys® High Frequency Structure Simulator (HFSS) has been used to analyze the electrical response of a section of human forearm with three domains of dielectric behavior – fat, muscle and artery (blood). The impedance values were calculated as the ratio of the output voltage at the electrodes to the applied known current (1 mA). A model was developed and was simulated for impedance values obtained within a frequency range of 1 kHz to 2 MHz. The measurements were done at three instances of radial artery diameter. The maximum resistance and reactance values were calculated as 445 Ω and 178.5 Ω, 356 Ω and 138 Ω, and 368 Ω and 144.3 Ω for diameters 2.3 mm, 2.35 mm, and 2.4 mm respectively. The set of impedance values obtained followed the Cole-plot trend. The results obtained were found to be in excellent agreement with the Cole modelling. The set of values obtained at three different diameters reflected the effect of blood flow on impedance values.

An Investigation of the Distribution of Electric Potential and Space Charge in a Silicon Nanowire

2014 ◽  
Vol 69 (10-11) ◽  
pp. 597-605 ◽  
Author(s):  
A. Wesam Al-Mufti ◽  
Uda Hashim ◽  
Md. Mijanur Rahman ◽  
Tijjani Adam
Keyword(s):  
Finite Element Method ◽  
Space Charge ◽  
Electric Potential ◽  
Silicon Nanowire ◽  
Electrical Potential ◽  
Comsol Multiphysics ◽  
The Finite Element Method ◽  
Simulation Experiments ◽  
Different Dimensions

AbstractThe distribution of electric potential and space charge in a silicon nanowire has been investigated. First, a model of the nanowire is generated taking into consideration the geometry and physics of the nanowire. The physics of the nanowire was modelled by a set of partial differential equations (PDEs) which were solved using the finite element method (FEM). Comprehensive simulation experiments were performed on the model in order to compute the distribution of potential and space charge. We also determined, through simulation, how the characteristic of the nanowire is affected by its dimensions. The characterization of the resulting nanowire, calculated by COMSOL Multiphysics, shows different dimensions and their effect on space charge and electrical potential

scholarly journals Agustin de Betancourt’s Mechanical Dredger in the Port of Kronstadt: Analysis through Computer-Aided Engineering

2018 ◽  
Vol 8 (8) ◽  
pp. 1338 ◽  
Author(s):  
José Rojas-Sola ◽  
Eduardo De la Morena-De la Fuente
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
3D Model ◽  
Russian Empire ◽  
Computer Aided Engineering ◽  
Operating Conditions ◽  
The Finite Element Method ◽  
Safety Coefficient ◽  
Computer Aided ◽  
The Russian Empire

This article analyzes the first self-propelled floating dredging machine designed and executed by Agustín de Betancourt in 1810 to dredge the port of Kronstadt (Russia). With this objective, a study of computer-aided engineering (CAE) has been carried out using the parametric software Autodesk Inventor Professional, consisting of a static analysis using the finite element method, of the 3D model which is reliable under operating conditions. The results have shown that the system of inertia drums proposed by Betancourt manages to dissipate the tensions between the different elements, locating the highest stresses in the links of the bucket rosary, specifically at the point of contact between links. Similarly, the maximum displacements and the greatest deformations (always associated with these points of greater stress), are far from reaching the limits of breakage of the material used in its construction, as well as the safety coefficient of the invention, confirming that the mechanism was oversized, as was generally the case at the time. This analysis highlights the talent of the Spanish engineer and his mastery of mechanics, in an invention, the first of its kind worldwide, which served the Russian Empire for many years.

scholarly journals 3D model of a Monolithic Honeycomb Adsorber for Electric Swing Adsorption for Carbon Dioxide Capture

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Ivaná Đukic ◽  
Marija Ječmenica Dučić ◽  
Nikola Nikačević ◽  
Menka Petkovska
Keyword(s):  
Carbon Dioxide ◽  
Physical Properties ◽  
Power Plants ◽  
3D Model ◽  
Carbon Dioxide Capture ◽  
Comsol Multiphysics ◽  
Simulation And Optimization ◽  
Electrothermal Desorption ◽  
1D Model ◽  
Simulation Results

The goal of this work was to develop a 3D model of Electric Swing Adsorption pro- cess for carbon dioxide capture from effluent gasses from power plants. Detailed 3D model of the composite honeycomb monolithic adsorber was developed for a sin- gle monolith channel and can be used to simulate and represent different physical properties: velocity, concentration and temperature. The advantage of this model is the fact that all physical properties and results can be presented visually in the 3D domain. COMSOL Multiphysics software was used for solving partial differential equations and simulations of adsorption and electrothermal desorption processes. Some simulation results are presented in this work. The results obtained from 3D simulations will be used for the adsorber model reduction to the 1D model which will be used for modeling and optimization of the whole ESA cycle due to its sim- plicity and computational demands. Simulation and optimization runs based on the 1D model will be performed in g-Proms software.

scholarly journals DEVELOPMENT PROSPECTS OF 3D MODELLING IN FORENSIC MEDICINE: BIM-TECHNOLOGY AND 4D MODELLING

2020 ◽  
Vol 6 (1) ◽  
pp. 4-13
Author(s):  
S. V. Leonov ◽  
Yu. P. Shakiryanova ◽  
P. V. Pinchuk
Keyword(s):  
Forensic Medicine ◽  
3D Model ◽  
Three Dimensional ◽  
3D Modelling ◽  
Line Of Sight ◽  
The Finite Element Method ◽  
Practical Application ◽  
Cad Modelling ◽  
Ct Data ◽  
Development Prospects

The present article provides an overview of the main methods of three-dimensional modelling currently used in various fields of science and practice, including forensic medicine. The possibilities of used methods are described.The authors introduce the concept of BIM-technology, which allows various methods working in 3D to be applied comprehensively: from photogrammetry and computed tomography to line-of-sight and CAD modelling. The article presents a case involving practical application of BIM-technology within the practical work of a forensic expert. The possibilities of supplementing and expanding the model over time within a single information field (4D modelling) are shown.Using the example of a specific examination, it is shown for which studies the created BIM-model can be employed, as well as what issues can be solved with its help. To that end, CT data was studied with the subsequent reconstruction of the 3D model of the damaged skull; blood traces were analysed with the subsequent 3D modelling of circumstances at the scene. The following methods were used for the reconstruction: photogrammetry, the finite element method and line-of-sight modelling of gunshot trajectories.Applied within a situational forensic medical examination, BIM-technologies successfully provided answers to the investigator’s questions: mechanism underlying the formation of blood traces; location of the bleeding source; trajectories of projectiles and their elements; circumstances of the occurrence; position of the shooter; prediction of glass breakage caused by a bullet.Conclusion. New computer technologies (BIM-technology and 4D modelling) constitute the next step in the development of three-dimensional modelling. Their introduction into the practice of experts will help create a single information field for all objects under study, as well as consider all possible investigative leads as objectively as possible

Silica Nanocomposite Membrane for Dehumidification

2017 ◽  
Author(s):  
Omar Almahmoud ◽  
Tae-Youl Choi ◽  
Young-Soo Seo ◽  
Hyo-Sun Kim ◽  
Kevin A. Johnson
Keyword(s):  
Water Vapor ◽  
Flow Rate ◽  
Driving Forces ◽  
Comsol Multiphysics ◽  
The Finite Element Method ◽  
Dry Air ◽  
Hydrophobic Polymer ◽  
Silica Nanocomposite ◽  
Novel Design ◽  
Polyurethane Membrane

Various designs of novel membrane (silica nanocomposite polyurethane membrane) were tested for its optimal configuration in a membrane-based dehumidification system. This membrane was designed with a hydrophobic polymer matrix with hydrophilic silica nanochains. In this dehumidification process, two driving forces were suggested: concentration gradient of water vapor in the atmospheric air channel due to sweep gas and pressure gradient due to vacuum. This paper describes validation of the model configurations using the finite element method software (COMSOL Multiphysics) with experiments. Pressurized air enters an air duct at 1–5 liters per minute flow rate. Air is then humidified using a misting nozzle until saturation. Then the humid air passes by the membrane with a vacuum pump connected vertically to the duct to maximize the dehumidification rate. A novel design showed water vapor reduction from 19.4 grams of water vapor per kilogram of dry air to 16.9 grams of water vapor per kilogram of dry air for the 1 liter per minute flow rate of the 47 mm diameter membrane.

Preliminary simulation analysis of the temperature fluctuation effect on Taiji-1 Laser interferometer

2021 ◽  
pp. 2140003
Author(s):  
Xiaoqin Deng ◽  
Ran Yang ◽  
Yu Niu ◽  
Keyword(s):  
Temperature Fluctuation ◽  
Laser Interferometer ◽  
Simulation Analysis ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Simulation ◽  
The Finite Element Method ◽  
Fluctuation Noise ◽  
Fluctuation Amplitude ◽  
Simulation Results

Space-borne gravitational wave detection imposes a demanding requirement on the sensitivity of the laser interferometer. Among all disturbances that affect the measurement accuracy of the laser interferometer, temperature fluctuations contribute significantly. In this paper, the structure model and the interference path design of Taiji-1 laser interferometer have been used to conduct a preliminary simulation analysis of the temperature fluctuation noise through the finite element method. The temperature, the displacement and the optical path difference fluctuations have been obtained and theoretically analyzed. The preliminary simulation results are consistent with the theoretical analysis, which shows that the thermal–structural–optical simulation scheme adopted in this paper is reasonable. With the preliminary simulation results and the actual temperature control of Taiji-1 laser interferometer, we estimate that in Taiji-1 laser interferometer system, the temperature fluctuation is below the order of mK, the node displacement is within [Formula: see text][Formula: see text]pm, and the interference arm length difference fluctuation amplitude of the laser interferometer is also within [Formula: see text][Formula: see text]pm.

Multi-Physics Coupling Analysis of Efficient Pumping Unit Linear Motor

2017 ◽  
Vol 872 ◽  
pp. 251-255
Author(s):  
Sen Wang ◽  
Yang Yang Zhao ◽  
Hong Kui Yan ◽  
Dong Ling Liu ◽  
Dong Sheng Zhao ◽  
...  
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
Vibration Frequency ◽  
3D Model ◽  
Vibration Mode ◽  
Simulation Analysis ◽  
Linear Motor ◽  
Coupling Analysis ◽  
Mode Stress ◽  
Pumping Unit

Taking efficient pumping-unit linear motor as the research object in this paper, SOLIDWORK has been used to establish 3D model and analyze multi-physics of the efficient pumping-unit linear motor, including vibration mode, stress analysis and the analysis of temperature field. Through the simulation analysis, getting efficient pumping unit linear motor of the top five order vibration frequency, pressure distribution and temperature distribution, theoretical references are provided for the analysis of the efficient pumping-unit linear motor. The innovation of the article is in coupling analysis of multi-physics.

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