Materials Literature
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L’obiettivo della tesi e quello di ricercare la migliore configurazione rotorica per un motore che avra un utilizzo domestico, nella fattispecie all’interno di una lavatrice. Si e partiti da un prototipo iniziale di motore a quattro poli e ventiquattro cave di statore precedentemente progettato e analizzato. La princi…
Abstract MEMS (micro‐electromechanical system) fabrication of solid oxide fuel cells to realize portable power sources, does not only mean a reduction of the spatial geometry of all components of a fuel cell but also means that with decreasing electrolyte and electrode layer thicknesses as well as grain size of these…
This paper presents the thermal characteristics of interior permanent magnet synchronous motor (IPMSM) for traction. In other to be a reliable traction system, electromagnetic and thermal characteristics of IPMSM are derived correctly. First of all, electromagnetic characteristics of the IPMSM at maximum torque and ra…
将螺二芴引入二芳基乙烯分子中,设计合成了一种新型的含螺二芴呋喃芳香杂环的二芳基乙烯光致变色分子7a.用FT-IR,NMR,MS和元素分析进行结构表征;研究了7a在正己烷溶液和乙腈溶液中的光致变色反应,结果表明7a在两种溶剂中均具有良好的光致变色性能.并且7a在正己烷溶液中变色速率和转化率比在乙腈溶液中大.还研究了7a光致变色过程中荧光光谱的变化,发现关环反应后荧光被淬灭,并且7a的荧光发射峰在极性溶剂中有很大的蓝移.研究了开环态7a,关环态7b的热稳定性,发现7a的热失重温度比未用螺二芴修饰的8a提高了100℃.7b的热稳定性也比8b高.
The response of lightning impulse voltage was tested in dielectric liquids employing the hydrodynamic modeling with three charge carriers by using the finite element method. To understand the physical behaviors of discharge phenomena in dielectric liquids, the response of step voltage has been extensively studied rece…
The 2D model of direct drive permanent magnet wind turbine 3 MW, 660 V, 14 rpm is set up to study the magnetic field by finite element method. Based on Maxwell equations, parameters are obtained in the case of static field, no load and load transient operation. The post processing is help to validate and optimize the…
During this study, intermetallic coatings TiAlx (x=1,2,3) were performed on titanium substrates: pure titanium and the commercial alloy, TA6V. The aim of this study was to elaborate aluminiure coatings on the surface and characterize the behaviour of these coated materials in oxidation at high temperature under air la…
Du fait de leurs excellentes propriétés mécaniques et de leurs faibles masses spécifiques, l'utilisation des matériaux composites, au sein des structures mécaniques, est en plein essor. Cependant, leur usinage entraine une usure prématurée et aléatoire des outils de coupes en cermet WC-Co. L'origine de cette étude pro…
La pile à combustible à oxyde solide qui permet de transformer l'énergie chimique en énergie électrique, est l'une des solutions envisagées pour résoudre la crise énergétique grâce à son rendement global élevé et son fonctionnement sans aucun rejet dans l'environnement. Ces dernières années, des apatites dont la formu…
Understanding the behaviour of nuclear materials in extreme conditions is of prime importance for the analysis of the operation limits of nuclear fuels, and prediction of possible nuclear reactor accidents, relevant to the general objectives of nuclear safety research. The main purpose of this thesis is the study of h…
This PhD focuses on the study of the lifetime of components and power semiconductor modules under thermal constraints, when power devices are used at high temperature or under high temperature cycles. The areas covered by this study relate more particularly to extremely harsh applications such as aerospace constraints…
Afin de permettre le développement de modèles manipulables par les concepteurs, il est nécessaire de pouvoir comprendre le fonctionnement des nanotubes, en particulier le transport des électrons et leurs propriétés électroniques. C’est dans ce contexte général que cette thèse s’intègre. Le travail a été mené sur quatr…
Abstract This article summarizes the approach to assessing the mechanical stability of solid oxide fuel cell (SOFC) ceramic materials and cell structures. The sources of stress are reviewed and their potential relaxation by creep is discussed together with the approach that is taken to calculate the complex stress dis…
Abstract Durability and reliability are necessary requirements for fuel cells to be introduced into the market place. However, activities necessary to meet these requirements are costly and time‐consuming. As a result, past experience and information is valuable and emphasis should be placed on ex situ and accelerated…
Abstract Aqueous carbonate electrolytes for fuel cells represent another class of invariant electrolytes for use with carbonaceous fuels and/or air (containing carbon dioxide). This section reviews the development of aqueous carbonate electrolytes, their properties, and their use in fuel cells with organic fuels such…
sob a exclusiva responsabilidade do autor.São Carlos, 08 de fevereiro de 2011 Ellen Raphael Dedico esta tese aos meus familiares, em especial ao meu avô Hermindo Rossi, símbolo de sabedoria, carinho e dedicação por todos da família.Um grande homem que me auxiliou muito em minha formação e representa parte do que sou.I…
Abstract Materials, manufacturing processes, commercial products of carbon used for alkaline fuel cells and cell stacks and different designs are reviewed in this chapter. Different methods for water product removal used in terrestrial and in space applications together with electrode production techniques and develop…
Abstract The 200 kW PC25 fuel cell power plant has demonstrated the intrinsic characteristics of fuel cells: high electrical and overall efficiency over a wide range of loads, rapid transient response, quiet operation and low emission of controlled pollutants. The power plants are designed to an industry standard and…
Abstract Some high oxide ion and proton conductors that can be used as electrolytes operating at temperatures less than 600 °C are reviewed. In particular, the oxide ion conductivity of the perovskite oxide of LaGaO3is discussed and applications of the LaGaO3‐based oxide as the electrolyte of solid oxide fuel cells (S…
Abstract Electrode polarization is a key to determine the dynamic feature of solid oxide fuel cells (SOFCs). Recently, various methods have been proposed for the evaluation of the electrode under the polarized state. Photoelectron spectroscopy and infrared spectroscopy have been applied to detect the surface intermedi…