Electro-Thermal Model of Liver Tissue and its Approximation

This paper deals with the proposal of the approximation method of complex organic tissues (in this example liver) for electro-thermal simulation. The main objective of the proposed approximation is to reduce the required computational power for electro-thermal simulation of given issue. The approximated parameters are meant to be used in three-dimensional finite element simulation models. Verification of proposed approximation is given by the comparison of electrical current distribution within complex model of liver tissue and approximated one

Support for Organization of Festival Contests

Tato diplomová práce se zabývá vytvořením podpůrného informačního systému pro organizaci soutěží na festivalu Animefest. Jedná se o webovou aplikaci postavenou na aplikačním rámci Django napsaném v jazyce Python. Systém nahradí aktuální webové řešení a zároveň přinese nové funkce. Organizátorům festivalu umožní vytvářet nové soutěže a spravovat je spolu s přihláškami účastníků, soutěžícím pak registrovat se do soutěží a spravovat své přihlášky.This bachelor thesis is focused on making supporting information system for organization of contests on Animefest festival. It is a web application based on framework Django written in Python language. The system will replace the current web solution and will have new functionalities. For system administrator it provides the creationg and managing new contests and also for managing entries. Contestants will have the possibility to register to the contest and manage their entries.

Indirect Electro-Thermal Modelling of Semiconductor Diode Using Non-Linear Behavior of Volt-Ampere Characteristic

The aim of the proposed paper is the development of an electro-thermal model of semiconductor component using an indirect modelling approach. The approach is based on the integration of the component’s electrical properties considering non-linear behavior of a V-A characteristic. In this way, the identification of semiconductor material properties considering non-linear dependencies and semiconductor volume is provided. The main aim of the presented approach is simplification of the electro–thermal interaction within finite-element modelling of the semiconductor components. In this way, it is possible to omit more complex boundary definitions and the setting of the semiconductor-based physics. The proposed methodology is presented within the development of a simulation model based on a small high-frequency rectifying diode, taking into account its geometric dimensions and the internal arrangement of its structure. Simulation was performed as a transient analysis, while the results from the steady-state operation for various operational conditions were compared to experimental measurements. Comparison between simulation and experiments is within 5% of the relative error. The achieved results represent appropriate accuracy of model behavior compared to the real operation

Voltage Stress Reduction on Compensation Capacitors of Wireless Charging Systems for Transport and Industrial Infrastructure

The paper deals with a proposal for circuit configuration of series-series (SS) compensated wireless power transfer (WPT) system with reduced voltage stresses on compensation capacitors. Nowadays, a huge effort is given for the development of reliable, efficient and robust wireless charging systems and therefore the circuit configuration and component selection are crucial to meet suitable operational characteristics. For this purpose, the current trends in WPT systems are outlined in the first section. Next, the analysis of frequently utilized WPT system configuration is provided and the most critical issues related to practical utilization are discussed. Consequently, the proposal of how to eliminate negative aspects is given. All theoretical statements are supported by mathematical apparatus of the proposed system and consequently by the simulation analysis

Modeling and Experimental Verification of Induction Heating of Thin Molybdenum Sheets

This paper deals with the issues relevant for precise finite element method (FEM) modeling of thin molybdenum plates’ induction heating. The proposed methodology describes the step-by-step Multiphysics (electro-thermal) design approach, verified by the experimental measurements. Initially, it was observed that the relative error between model and experimental set-up is within the 1.2% up to 2.5% depending on the location of the measuring points. Further research was focused on the enhancement of the simulation model in the form of its parametrization. It means that it is easy to define the induction coil’s operational parameters and geometrical properties (ferrite shape, operating frequency, the distance between plate and heating element, the value of coil current, etc.). The target of this approach is to be able to determine the optimal operational settings targeting the required heating performance of thin molybdenum plates. One of the main requirements regarding the optimal heating process is temperature distribution within the molybdenum plate’s surface. The proposed model makes it possible to obtain information on optimal operational conditions based on the received results

Wireless power transfer system design methodology - analysis, design, verification

The paper briefly discusses simplified proposal of the design methodology, which suites for wireless power transfer system development. For this purpose, the most important aspects related to standards and regulations are initially discussed, while focus is given on automotive segment, i.e. charging systems. Discussed are topics related to principal design procedure, which are analyzed regarding issues related to electromagnetic design of coupling coils. Related to power electronics concept, recommendations are given on topology selections focusing on proper connection to the grid. Given design procedure is finally verified by laboratory measurements measurement, whereby efficiency of wireless power transfer is key identified variable

Generalized design approach on industrial wireless chargers

The paper briefly discusses the most important standards and regulations established for high-power wireless power transfer systems and introduces the main issues concerned with the conceptual design process. It analyses the electromagnetic design of the inductive magnetic coupler and proposes key formulas to optimize its electrical parameters for a particular load. The method applies to both the resistive load and the battery charging. It also suggests basic topologies for conceptual design of power electronics and discusses its proper connection to the grid. The proposed design strategy is verified by experimental laboratory measurement including analyses of the leakage magnetic field

The Biocompatibility of Wireless Power Charging System on Human Neural Cells

The progress in technology and science leads to the invention and use of many electrical devices in the daily lives of humans. In addition to that, people have been easily exposed to increased newly generated artificial electromagnetic waves. Exponential use of modern electronic devices has automatically led to increase in electromagnetic wave exposure. Therefore, we constructed the prototype of wireless power charging system to study the biocompatibility of electromagnetic field (EMF) generated by this system on various human cell lines. There are many studies indicating the negative bio-effect of EMF on various types of cells, such as induction of apoptosis. From the other point of view, these effects could rather be beneficial in the way, that they could eliminate the progress of various diseases or disorders. For that reason, we compared the impact of EMF (87 kHz, 0.3–1.2 mT, 30 min) on human normal as well as cancer cell lines based on morphological and cellular level. Our results suggested that EMF generated by wireless power charging systems does not have any detrimental effect on cell morphology, viability and cytoskeletal structures of human neural cells