Дисертації з теми "Electric technologie"
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Svoboda, Jiří. "Nekonvenční technologie elektroerozivního drátového řezání." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229332.
Повний текст джерелаАнотація:
This thesis deals with technology of electric discharge machining with emphasis on application of the principle of material removal on wire cut electric discharge machine. The main part is concentrated on wire cut electric discharge machining in terms of a small tool making shop. The goal of the thesis is to create a wire cut electric discharge machining workplace in the company with a focus on the production of cutting tools. The thesis defines requirements for each component of cutting tools and strategies for their machining. Machining of model part and subsequent technical - economic evaluation is included in the final part.
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Kalous, Ondřej. "Racionalizace technologie výroby forem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231505.
Повний текст джерелаАнотація:
The diploma thesis Rationalization technology of production tools is divided into two parts. The first part is focused on injection molding of plastic materials and analysis current status of production injection tools. The second part contains proposal of rationalization steps in the production process and evaluation of rationalization.
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Tollrian, Zdeněk. "Technologie opracování středicích nákružků a patek elektromotoru v systému řízení výroby." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230297.
Повний текст джерелаАнотація:
The current processing of electric motor feet and centering collars has been focusing on two main production methods. The production transfer from Germany allowed the introduction of a new enhanced technology. Cutting conditions values, cutting process operating forces , tool life criteria for a maximum productivity and a minimum costs were calculated. Control measurements of the required collar and stator pack concentricity provided the necessary feedback.
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Duhaime, Eric. "Capital et inventivité : de l'intellect général à General Electric." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAC004/document.
Повний текст джерелаАнотація:
Cette thèse vise à éclairer le rôle économique de la science et de la technologie dans le cadre du capitalisme. À cette fin, elle s’enracine d’abord dans une discussion des thèses développées à ce sujet par Karl Marx à l’égard du capitalisme industriel qu’il avait sous les yeux. En tenant compte de la transition du capitalisme industriel au capitalisme avancé, elle s’intéresse ensuite au rôle que joue la production scientifique et technologique dans le contexte spécifique du capitalisme avancé. Prenant le contrepied de la théorie de l’« économie immatérielle » développée par Michael Hardt et Antonio Negri, l’objectif de cette thèse est double. Elle vise, d’une part, à mettre au jour et reconstruire la façon dont Marx problématise le rapport de la science et de la technologie à la dynamique économique de son époque et, de l’autre, à éclairer les modalités et les enjeux liés à l’intégration de la production scientifique et technologique au sein de la dynamique économique contemporaineThis dissertation aims to clarify the economic role of science and technology within capitalism. To this end, it is first rooted in a discussion of the ideas elaborated by Karl Marx on this topic in respect with the industrial capitalism that was unfolding before him. Taking into account the transition from industrial to advanced capitalism, this dissertation then seeks to question the economic role of scientific and technological production into the specific context of advanced capitalism. Supporting an opposing view to the theory of “immaterial economy”, as developed by Michael Hardt and Antonio Negri, this dissertation has a twofold objective. On the one hand, it aims to uncover and reconstruct the way Marx problematizes the relationship of science and technology to the economical dynamics of his time and, on the other hand, to clarify the issues relating to the integration of scientific and technological production into contemporary economical dynamics
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Bartoš, Pavel. "Elektroerozivní drátové řezání." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229873.
Повний текст джерелаАнотація:
This work deals with analysis of EDM wire cutting technology and aims to assess the current situation and the real possibilities of EDM wire cutting usage in a small engineering company. Furthermore, it addresses manufacturing technology of a model component and the subsequent economic evaluation.
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Janás, Milan. "Volba vhodné technologie pro výrobu svařované konstrukce elektrokotle JE 12 a JE 6." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-317189.
Повний текст джерелаАнотація:
The diploma thesis on the selection of appropriate technology to produce the welded construction of electric boiler JE6 / 12 aims to evaluate available production technologies and choose the most suitable of them. Choosing the technologies focuses primarily on those that are available at Slokov. Due to the connection of the welding robot to the production, it is necessary to consider the overall connection of the production and the high accuracy of the production. The individual methods of production, material separation, welding, bending and surface treatment are first theoretically analyzed and their advantages, disadvantages and parameters are summarized. Subsequently, it is practically tested individual technologies for a representative part and it evaluates the achieved parameters and economics of production. With the results obtained, the most suitable technologies are selected. With the selection of technologies, there is a need for a change in design and production parameters. Changes and modifications to the design describe another point. To achieve maximum efficiency and quality of production, a welding robot is used to make welds. The description of the production, modifications and overall design of the robot describes the next point of this work. The last part summarizes the economics of selected production technologies and details the technological process. The aim of the thesis is to design such technologies that will be advantageous from the point of view of the economy and from the perspective of the available possibilities of the company.
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Liu, Xiaojun. "Hygiénisation par technologie électrique de déchets alimentaires en vue de leur méthanisation." Thesis, Lorient, 2019. http://www.theses.fr/2019LORIS602.
Повний текст джерелаАнотація:
La législation (CE n°1069/2009) impose une étape d'hygiénisation (traitement thermique à température ≥ 70 °C pendant une durée ≥ 60 min sans interruption) avant méthanisation des sous- produits animaux. Ce traitement, consommateur d’énergie, réduit la rentabilité globale des installations de méthanisation. L’étude bibliographique montre que, en Europe, la consommation énergétique du procédé d’hygiénisation thermique représente 6 à 25% de l’énergie primaire générée par les unités de production de biogaz. Dans le cadre des travaux de thèse présentés, des solutions alternatives d’abattement microbien, notamment les électro-technologies (ex. Champs Électriques Pulsés, CEP) ont été étudiées. Ces technologies sont essentiellement développées pour l’inactivation athermique des micro-organismes des denrées alimentaires. Les souches Enterococcus faecalis ATCC 19433 et Escherichia coli ATCC 25922 ont été sélectionnées comme bactéries indicatrices. Une étude des cinétiques d'inactivation des indicateurs à différents paramètres électriques dans les procédés en batch et en continu a été réalisée. L’évaluation de l’efficacité du couplage des CEP et d’un chauffage ohmique, l'effet de la quantité d’énergie utilisée pour le traitement par CEP, la régénération cellulaire des bactéries endommagées et la modélisation cinétique et numérique du procédé sont également abordés. Les résultats obtenus confirment la capacité des CEP à hygiéniser les sous-produits animaux (i.e. une réduction de 5- log10 d’Ent. faecalis) dans les systèmes en batch et en continu. Ainsi, le couplage du traitement par CEP et du chauffage ohmique peut significativement réduire la consommation énergétique du procédéThe European Union regulation (CE n°1069/2009) imposes a step of hygienization (thermal treatment at temperature ≥ 70 °C for a treatment time ≥ 60 min without interruption) before anaerobic digestion of certain biowaste issued from the agricultural and food processing industries. This energy-consuming treatment reduces the profitability of biogas production facilities. The literature review shows that, in Europe, the energy consumption of the thermal hygienization process accounts for around 6 to 25% of the primary energy produced by biogas plants. In the present PhD thesis, the alternative solutions for the microbial pasteurization, namely the electro- technologies (e.g. pulsed electric field, PEF) were studied. These technologies are essentially developed for the athermal inactivation of pathogens in food products. The bacterial strains Enterococcus faecalis ATCC 19433 and Escherichia coli ATCC 25922 were selected as indicator bacteria. A systematical study on the inactivation kinetics of the indicator bacteria treated at different electric parameters in batch and continuous system was realized. The efficiency of the treatment coupling PEF and ohmic heating, the effect of the specific energy delivered by PEF, the recovery of the injured bacteria and the kinetic and numeric modeling of the process were investigated as well. Results confirm the ability of PEF to hygienize animal by- products (i.e. a reduction of 5 log10 of Ent. faecalis) in batch and continuous system. The PEF treatment coupled with ohmic heating could significantly reduce the energy consumption of the process
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Larhzaoui, Thomas. "Fiabilisation de la technologie courant porteur en ligne en vue de piloter des actionneurs d’aéronefs." Thesis, Rennes, INSA, 2014. http://www.theses.fr/2014ISAR0009/document.
Повний текст джерелаАнотація:
Dans le cadre de l’avion plus électrique, les avionneurs cherchent à remplacer les commandes de vol hydrauliques par des commandes de vol électriques, avec pour intérêt de diminuer le poids, et d’améliorer la flexibilité des équipements aéronautiques. Sachant que sur un A380, la distance cumulée pour les câbles peut atteindre plus de 500 km, la solution consistant à faire cohabiter les transmissions de données et de puissances au sein de mêmes câbles grâce à la technologie CPL pourrait contribuer à réduire la masse de câble dans un avion. Cependant les câbles de puissance n’ont pas été dimensionnés pour transmettre un signal informationnel, et les équipements présents sur le réseau sont source de bruits. Dans ce contexte nous souhaitons montrer la faisabilité d’une transmission CPL soumise aux contraintes avioniques tout en respectant les normes aéronautiques. La première partie des travaux a consisté à mesurer le canal de propagation sur un banc de test représentatif d’un environnement aéronautique. Le canal de propagation est composé de deux coupleurs de type inductif ou capacitif dont le but est de connecter les câbles de télécommunication au réseau de puissance et d’une paire bifilaire torsadée de puissance d’une longueur de 32 m représentative d’un réseau HVDC ±270 V. Nous avons alors testé trois architectures différentes : l’architecture point-À-Point avec coupleur capacitif, l’architecture point-À-Point avec coupleur inductif et l’architecture point-À-Multipoints avec coupleur inductif. Le but de ces mesures a été d’évaluer la fonction de transfert du canal sur la bande [1 ; 100] MHz. Nous avons alors calculé les éléments caractéristiques du canal comme la bande de cohérence et l’étalement des retards. Après la caractérisation du canal de propagation, nous avons choisi et dimensionné les algorithmes de traitement du signal au regard des spécifications aéronautiques à savoir : un débit utile de 10 Mbit/s, un temps de latence de 167-334 μs, un TEB de 10-12 et le respect du gabarit de la DO-160 en émission conduite. Au regard de la fonction de transfert du canal, nous avons choisi d’utiliser l’OFDM comme technique de transmission. Ainsi, à l’aide de la caractérisation du canal de propagation nous avons au cours d’une étude paramétrique défini les paramètres de la transmission OFDM au regard des spécifications de débit et de temps réel. Dans un second temps, nous avons implanté les paramètres OFDM ainsi que la modélisation du canal de propagation dans une chaine de transmission Matlab. Cette chaine nous a alors permis de vérifier les paramètres issues de l’étude paramétrique ainsi que de définir le système de codage de canal (Reed-Solomon et code convolutif) pour respecter les spécifications aéronautiques. La dernière partie de cette thèse a consisté en l’étude du système de synchronisation. Du fait de la stabilité du canal de propagation, nous avons considéré une synchronisation fine du système lors d’une phase d’initialisation puis nous nous somme focalisé sur le dimensionnement d’un système de suivi dans le but de corriger le décalage de fenêtre FFT dû au défaut de fréquence d’échantillonnage. Pour limiter les pertes de débit lors de la phase de suivi, nous avons proposé une estimation de l’erreur de fréquence d’échantillonnage sur la phase des données reçues sur une période de 20 symboles OFDMIn the new aircrafts, hydraulic flight control systems are replaced by electric flight control systems. The main interests are a better flexibility of the aeronautical equipments and a decrease in maintenance costs and construction costs, but the major problem is the increasing of the wires length. In order to decrease this length, it has been proposed to use power line communications (PLC) technology for flight control systems. The decrease of wire will first decrease aircraft weight and therefore the consumption of kerosene and on the other hand will simplify maintenance and construction. The first part of this work is the measurement and the characterisation of the propagation channel on an aeronautic test bench (with HVDC supply and loads). This channel is composed of two couplers (inductive or capacitive) in order to connect the telecommunication system on the power wires with galvanic isolation and one twisted pair of 32 m longs. We have tested three architectures: the point-To-Point architecture with capacitive coupler, the point-To-Point architecture with inductive coupler and the point-To-Multipoint architecture with inductive coupler. The purpose of these measurements is to measured the transfer function on the [1 ; 100] MHz bandwidth. Then, we have computed the channel parameters like the coherence bandwidth and the delay spread. The second step was the design of the signal processing algorithm in order to satisfy the aeronautical specifications: a useful bite rate of 10 Mbit/s, a latency of 167- 334 μs, a BER of 10-12 and the respect of the DO-160 gauge in conducted emissions. For the transmissions, we have chosen the OFDM technology which has been use with success in other PLC systems. With the channel characterization, we have proposed a parametric study in order to define the OFDM parameters to satisfy the bite rate and the real time constraints. After, we compute digital simulations with Matlab to check the OFDM parameters. With these simulations, we have also defined the channel coding parameters (Reed-Solomon and convolutional coding) to satisfy the aeronautical specifications. The last part of this study was the design of the synchronisation system. Because of the channel stability, we considered a precise synchronisation after an initialisation period. Then, we focus on the estimation of the FFT shift, due to the sampling frequency shift, during a following-Up period. In order to avoid the decrease of the latency and the bitrate due to the pilot symbols or pilot sub-Carriers insertion, we proposed to correct the FFT shift with the receive data thanks to the maximal likelihood algorithm
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Uudelepp, Oscar, Ellen Nordén, and Douglas Lowén. "Electric Bike : Independent Project in Electrical Engineering." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-353617.
Повний текст джерелаАнотація:
A group project has been made in which the goal was to build an electric bike. The main focus of the project was to build the surrounding control system of a BLDC motor. A complete BLDC hub motor was purchased. The wheel managed to spin forward but it was never implemented on a bike due to time constraints. This was a rewarding and educational project that can be replicated or improved for future students.
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Chavez, Henry. ""Dreaming of electric sheep" Les cycles techno-économiques du système mondial et le développement technoscientifique en Équateur : sources et limites du projet postnéolibéral ( 2007 – 2016 )." Thesis, Paris, EHESS, 2017. http://www.theses.fr/2017EHES0090.
Повний текст джерелаАнотація:
Sur la base d’une étude historique des rapports entre les cycles techno-économiques du système mondial et le processus de transformation économique, politique et idéologique d’un pays périphérique comme l’Équateur, cette recherche présente une analyse critique sur le processus de développement du champ technoscientifique de ce pays et le projet de modernisation postnéolibéral mis en place par son gouvernement entre 2007-2017. L’exposition est organisée en deux parties. La première analyse les rapports entre les transformations techno-économiques mondiales et les cycles économiques et politiques locaux ; les rapports entre ces cycles, les vagues de modernisation du système d’éducation supérieure équatorien et la reproduction des élites locales ; et enfin, les rapports entre ces deux derniers et le processus de développement scientifique, technologique et industriel du pays. La deuxième partie est consacrée à l'étude en détail du dernier de ces cycles, caractérisé par la mise en place du projet postnéolibéral de modernisation technoscientifique. Cette étude se focalise particulièrement sur trois projets : la réforme de l’éducation supérieure, le programme de bourses d’étude à l’étranger et le projet de construction de Yachay, une ville dédiée à la science, à la technologie et à l’innovation. Les résultats de ces analyses dévoilent le caractère idéologique de ces projets, conçus et dirigés par un même réseau d’intellectuels et financés par l’essor des exportations de matières premières qui a accompagné cette phase ascendante du cycle périphérique. Enfermés dans leur quête idéologique d’un modèle de développement alternatif et les contraintes imposées par les processus de transformation du système mondial, ces acteurs ont fini par produire un projet de modernisation contradictoire basé sur une abstraction empirique adaptée à leurs besoins de légitimation politique. La fin de l’essor économique a dévoilé les limites de ce projet idéologique dont les résultats concrets sont une plus lourde bureaucratie, le gaspillage des ressources publiques et l’accumulation de pouvoir. Nous suggérons que ce résultat est un effet du décalage entre les cycles de transformation à la périphérie et au centre du système mondial et du processus de reconfiguration global liée à la montée de l’influence chinoise et au déploiement de la dernière vague de transformations techno-économiques. Cette recherchée s’inscrit ainsi dans la lignée de réflexion sur les transformations du système mondialBased on a historical study of the relationship between the techno-economic cycles of the global system and the economic, political and ideological transformations in Ecuador, this research presents a critical analysis of the development process of the technoscientific field in this country and the post-neoliberal modernization project implemented by its government between 2007-2017. The thesis has two parts. The first one develops an analysis on three levels: the relationships between the global techno-economic cycles and the political and economic transformations in Ecuador; the relationships between these transformations, the waves of modernization of the Ecuadorian higher education system and the reproduction of local elites; and the relationship between the latter and the scientific, technological and industrial development of the country. The second part presents a detailed study of the last cycle, characterized by the implementation of the post-neoliberal project of technoscientific modernization. This study focuses, particularly, on three projects: the higher education reform, the scholarship program for studies abroad and the Yachay technopole project. These analysis results reveal the ideological character of these projects, designed and directed by the same network of intellectuals and financed by the rise of commodity exports which accompanied this upward phase of the peripheral cycle. Trapped in their ideological quest for an alternative development model and the constraints imposed by the transformation processes of the global system, these actors have finally produced a contradictory modernization project based on an empirical abstraction adapted to their needs for political legitimization. The end of the economic upswing has unveiled the limits of this ideological project whose concrete results are a heavier bureaucracy, waste of public resources and the accumulation of power. We suggest that this result is an effect of the three interrelated processes: the gap between the transformation cycles at the periphery and at the center of the global system, the global reconfiguration linked to the rise of Chinese influence and the deployment of the latest techno-economic wave of innovation. This research aims thus to contribute to the debate on the historical transformations of the global system
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Rotureau, David. "Développement de piles à combustible de type SOFC, conventionnelles et mono-chambres, en technologie planaire par sérigraphie." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2005. http://tel.archives-ouvertes.fr/tel-00009968.
Повний текст джерелаАнотація:
Ce travail marque le départ d'une nouvelle thématique au sein du laboratoire dans le domaine des piles à combustible à oxydes solides planaires. Fort de son expérience dans le domaine des capteurs, l'objectif a été de réaliser des prototypes avec des technologies "bas coûts" comme la sérigraphie à partir de matériaux classiques pour les piles, plutôt que de rechercher des nouveaux matériaux avec des propriétés optimales, mais qui peuvent être amoindries lors de la réalisation d'un dispositif complet. Ces matériaux sont la zircone yttriée (YSZ) pour l'électrolyte, un manganite de lanthane dopé au strontium (LSM) pour la cathode et d'un cermet à base d'oxyde de nickel et de zircone yttriée (Nio-YSZ) pour l'anode.la première partie des travaux a consisté à caractériser les propriétés physico-chimiques et électriques des matériaux choisis, sur des frittés d'abord et ensuite sur des couches sérigraphiées de YSZ, LSM ou NiO-YSZ. Ces caractérisations ont montré une bonne adaptabilité de nos matériaux pour une application pile à combustible.
La seconde partie a consisté à tester les prototypes réalisés sur l'électrolyte support, et sur anode support avec les électrodes et l'électrolyte déposé par sérigraphie. Les faibles performances obtenues sont surtout dues à la faible température de fonctionnement (800°C), à l'épaisseur de l'électrolyte support (environ 1mm)ou à la porosité des couches de YSZ par sérigraphie. Enfin, nous avons en même temps testé un dispositif original qui consiste à exposer les deux électrodes à un mélange de combustible et du comburant. Ce dispositif mono-chambre prometteur inspiré de l'expérience des capteurs potentiométriques développés au laboratoire par Nicolas Guillet (2001), permet de s'affranchir des problèmes d'étanchéité des deux compartiments gazeux. De plus, les performances obtenues ne sont que deux fois moindres par rapport à celles obtenues avec une pile conventionnelel à deux chambres gazeuses.
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Paulino, Clóvis Aparecido. "Estudo de tecnologias aplicáveis à automação da medição de energia elétrica residencial visando à minimização de perdas." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-13122006-151957/.
Повний текст джерелаАнотація:
Atualmente a medição de energia elétrica para residências em centros urbanos é realizada por meio de medidores eletromecânicos lidos de forma manual. Neste processo uma série de problemas foram observados, dos quais se destacam: erros de leitura, dificuldade de acesso ao ponto de medição, bancos de dados sem atualização, dentre outros. A automação do processo de medição e da leitura, com base nos medidores existentes ou com o uso de medidores eletrônicos da energia elétrica, além de resolver os problemas citados, tem potencialmente uma série de vantagens, que incluem: combate a fraudes e furto de energia, implementação de tarifas diferenciadas em função da hora de consumo (tarifa amarela), corte e religamento remoto de energia, implementação de programas de energia pré-paga, levantamento de curvas de carga e eliminação de erros e custos do processo de leitura manual. Por outro lado observa-se que existem no Brasil cerca de 43 milhões de medidores residenciais instalados, sendo relativamente baixos os custos dos medidores eletromecânicos e do sistema de leitura manual. Desta forma, somente será possível implementar sistemas de automação da medição de energia elétrica residencial se os sistemas ora propostos forem ao mesmo tempo de custo reduzido e altamente confiáveis. O sistema de automação em estudo irá considerar inclusive o aproveitamento dos medidores eletromecânicos existentes, com a instalação de sistemas eletrônicos de coleta dos dados de consumo comunicando-se com concentradores locais, que por sua vez são interligados a sistemas computacionais instalados dentro da concessionária. Os resultados do estudo mostram que hoje existe uma concreta possibilidade de se obter sistemas de automação da medição de energia elétrica residencial seguros e de custos reduzidos. O trabalho ora proposto será desenvolver um sistema automatizado para a medição de energia residencial em centros urbanos, constituído por um módulo concentrador para oito residências, com comunicação deste para um centro de operação da concessionária. Será apresentada a metodologia para a implementação do sistema e considerado um estudo de caso.In these days, the energy measurement system for residences in urban areas is carried out by eletromechanical meters, which are read manually. Several problems have been observed in this process, which we can emphasize: reading errors, difficulty to access the measurement place, outdated databases, etc. The reading and the measurement automation processes, based in the current eletromechanical meters or with the electronic version of these equipment, besides solving the mentioned problems, have several advantages, such as: minimization of fraud and robbery of energy, implementation of differentiated rates depending on the time of the day (ex:yellow rate), remote energy switch-off and switch-on, implementation of a prepaid system, possibility to get the load curve of each consumer and elimination of error and costs embedded in the manually reading process. On the other hand, we can observe that in Brazil there are an estimated 43 millions residential meters already installed, and the costs for the current measurement system, and also of the meters, are very low. In this scenario, the implementation of a automated system for residential energy measurement is that the proposed system has a very low cost at the same time provides a high reliability. The proposed automation system will consider the reutilization of the current mechanical meters, with the installation of an electronic systems for the consumption data collection, communicating with local concentrators, which in their turn are linked to a computing systems in the energy company. The results of the present work show that, nowadays, there is a real possibility to get, a trustable and cheap automated measurement system for energy in residential urban area. The proposed work is the development of an automated system, for residential energy measurement in urban area. It's composed of a concentrator module for eight residences, with communication from this point to the energy company's operation center. It will be presented a methodology to implement such a system and also a case study.
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McCown, Eddie E. "Systems engineering technology readiness assessment of hybrid-electric technologies for tactical wheeled vehicles." Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/43955.
Повний текст джерелаАнотація:
Approved for public release; distribution is unlimitedThe Department of Defense is the largest federal government consumer of fossil fuel. The military has been severely limited by the burden of petroleum-based fuel technologies, which have greatly hindered the military’s ability to conduct operational missions in support of worldwide commitments. The military’s interoperability is hindered by an insatiable worldwide demand for fuel supply and a profound dependence on other countries, especially hostile nations for fuels. Improvements in technology are critical to meeting energy goals. One solution could be the use of hybrid-electric vehicles. Hybrid-electric technology (HET) offers significant opportunities for the military to meet the growing demands for reduced fuel consumption and increased combat vehicle performance. With fuel costs as high as $500 per gallon in the battlefield, according to Gen. James T. Conway, former Commandant of theMarine Corps, it is astonishing that hybrid-electric (HE) military tactical wheeled vehicles have not been deployed. This study presents a technology readiness assessment of the benefits and challenges relative to cost, maturity and technical complexity of the HE system for military vehicle applications. It describes the potential benefits offered should the military make the leap into HET.
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Liakouti, Achraf. "Analyse et modélisation de rayonnement électromagnétique des réseaux CPL." Thesis, Université Clermont Auvergne (2017-2020), 2017. http://www.theses.fr/2017CLFAC063/document.
Повний текст джерелаАнотація:
L'usage des câbles électriques comme support de transmission de données numériques en vue d'applications comme l'accès à Internet ou la domotique, est certes très attractif. Cependant, les rayonnements électromagnétiques (EM) non intentionnels, engendrés par les systèmes filaires lors d’une transmission CPL, peuvent être une source de pollution EM et constituent un problème gênant de compatibilité électromagnétique (CEM). L'évaluation de ces rayonnements en champ proche revêt donc un intérêt certain.Dans ce manuscrit, le travail de recherche effectué, consiste à modéliser le rayonnement électromagnétique engendré par les conducteurs filaires utilisés par la technologie des courants porteur en ligne (CPL). En effet, l’estimation du rayonnement d’un réseau CPL de point de vue de la CEM, s’avère très importante pour la prédiction des niveaux d’émissions rayonnées. Les valeurs des champs rayonnés par le réseau CPL sont parfaitement définies si la distribution du courant est déterminée, en pratique, l'accès à la mesure de ces courants est très difficile voire impossible.On propose, donc dans ce mémoire une approche simplifiée des équations intégrales des champs électromagnétiques afin de quantifier convenablement le rayonnement EM émis par les systèmes filaires avec un minimum d’informations mesurées. Ce modèle est capable de traiter des cas pour lesquels l’identification du courant le long des conducteurs est compliquée et numériquement fastidieuse à obtenir avec les codes de simulation existants (FEKO, NEC,… etc.). Notre modèle a été largement validé, soit par simulation, en utilisant le logiciel Feko, ou bien expérimentalement à travers une étude comparative effectuée sur différents cas testsThe use of electric cables as a support for transmitting digital data for applications such as Internet access or home automation is certainly very attractive. However, unintentional electromagnetic radiation (EM) from such wire systems for PLC transmission may be a source of EM pollution and a problem of electromagnetic compatibility (EMC). Therefore, the evaluation of the corresponding radiations in the near-field zone is of a certain interest. In this manuscript, a mathematical model for estimation of the electromagnetic radiation from wire conductors used by the PLC technology is presented. From the EMC standpoint, the radiation of a PLC network is observed from the aspect of the emission levels. The corresponding radiated values of the fields may be appropriately determined if the current distribution in the PLC network is known. However, in practice the approach to measuring these currents is very difficult or even impossible. Therefore, a simplified approach based on the integral equations of the electromagnetic fields is proposed in order to adequately quantify EM radiation from PLC wire conductors in cases of least measured data. Also, this model may be applied in cases where estimation of current distribution is numerically difficult even by using existing numerical software (FEKO, NEC, etc.). The proposed model is validated either by simulations compared to FEKO software, or experimentally through a comparative test case studies
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Serdyn, J. J. "Electronic voltage regulator technology for rural electrification." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/903.
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Heim, Gregory R. "Management of technology and quality in electronic consumer service operations : applications to electric food retailing /." Diss., ON-CAMPUS Access For University of Minnesota, Twin Cities Click on "Connect to Digital Dissertations", 2000. http://www.lib.umn.edu/articles/proquest.phtml.
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Vasic, Dejan. "Apports des matériaux piézoélectriques pour l'intégration hybride et monolithique des transformateurs." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2003. http://tel.archives-ouvertes.fr/tel-00789774.
Повний текст джерелаАнотація:
Le travail présenté dans ce mémoire s'inscrit dans le cadre des problèmes d'intégration des dispositifs électriques en général et des composants passifs en particulier permettant de réaliser des systèmes de conversion intégrés. Le travail débute avec l'étude et la caractérisation de transformateurs piézoélectriques de taille " méso " de quelques fractions de watts à quelques watts destinées à la mise en œuvre d'une commande rapprochée de transistors de puissance MOSFET & IGBT intégrée sur un substrat en PCB. Il se place ensuite dans la problématique de l'intégration sur silicium de micro-transformateur piézoélectriques pour des systèmes d'alimentation électrique de quelques micro-watts. L'objectif est d'établir de nouvelles structures de micro-transformateur, exploitant des couches minces d'AlN et de PZT déposées par pulvérisation cathodique, dont les étapes de fabrication sont compatibles avec les technologies et les contraintes de la microélectronique.
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Meyer, Bernard. "Opportunities for in-line, transistorbased technologies on MV and LV power distribution networks." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51864.
Повний текст джерелаАнотація:
Thesis (MScEng)--University of Stellenbosch, 2000.ENGLISH ABSTRACT: Once more opportunities exist for innovative technologies to be applied on MV and LV power distribution networks to meet the new challenges set by government through its National Electrification Programme (NEP) to electrify a further 2,5 million households of which a large majority are in low-density rural areas. Electronic means of voltage compensation of long MV and LV networks supplying these low-density rural areas are now possible in the form of electronic voltage regulators mounted on the secondary side of distribution transformers and service connection boxes along the LV feeders. Furthermore, it is now possible to provide remote rural agricultural customers with singlephase supplies supported by end-use technologies in the form of electronic phase converters that eliminate the need for three-phase supplies. This hybrid of supply- and end-use technologies together with Eskom's "self-build" policy has made the dream of Eskom grid power a reality.
AFRIKAANSE OPSOMMING: Nuwe geleenthede het na yore getree vir die toepassing van innoverende tegnologie op medium- en laagspannings netwerke in antwoord op die uitdagings gestel deur die regering in die vorm van die Nasionale Elektrifiseringsprogram (NEP). Die elektrifisering van 'n verdere 2,5 miljoen huishoudings waarvan die grootste gedeelte in yl bevolkte plattelandse gebiede is, word in vooruitsig gestel. Spanningskompensasie van lang laag- en mediumspannings netwerke word nou moontlik gemaak deur middel van elektroniese spanningsreguleerders, gemonteer aan die sekondere kant van distribusie transformators en in diensaansluitingskaste op laagspannings voerders. Verder is dit ook nou moontlik om afgelee landelike plase met enkelfase krag, gerugsteun deur eindverbruik tegnologie in die vorm van elektroniese fase omsetters, te voorsien. Die beskikbaarheid van hierdie tegnologie elimineer die vraag na drie-fase krag. Hierdie hibriede kombinasie van toevoer- en eindverbruik tegnologie in kohesie met die selfbou beleid van Eskom, maak dit moontlik dat 'n droom van Eskom voorsiende elektrisiteit, in 'n werklikheid omskep word.
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Bowlin, Oscar E. "Modeling and simulation of the free electron laser and railgun on an electric Naval surface platform." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Mar%5FBowlin.pdf.
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Parker, Andrews James. "Nanocluster technologies for electronics design." Thesis, University of Birmingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369176.
Повний текст джерелаАнотація:
The work presented in this thesis covers an investigation into the use of metal nanoclusters in nanoelectronics design. Initial studies explored the interactions of the dodecanethiol passivated gold nanocluster, held in solution with toluene, and the native oxide covered silicon surface. Deposition of the clusters is achieved by pipetting u-litre quantities of the solution onto the surface, and allowing the solvent to evaporate leaving the clusters as residue. Patterning of the surface with micron scale photoresist structures prior to cluster exposure, led to the selective aggregation of cluster deposits along the resist boundaries. An extension of this technique, examined the flow of the cluster solution along photoresist structures which extended beyond the solution droplet. Investigation into the electronic properties of nanocluster arrays generated non-linear current-voltage curves, which are explained in terms of two very simple models. These results cast doubt over the suitability of the lateral approach to nanocluster device fabrication, and led to the exploration of vertical device design. Vertical devices, based around -50nm diameter silicon nanopillars with nanoc1usters on top, afford the necessary level of control over all aspects of nanocluster positioning; deposition of a single cluster layer is confined laterally to the pillar cross-section. Initial results of vertical device fabrication, show the considerable promise of this approach to cluster based electronic systems.
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Zacot, Chimi I. "Shipboard wireless sensor networks utilizing Zigbee technology." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Sep%5FZacot.pdf.
Повний текст джерелаАнотація:
Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 2006.Thesis Advisor(s): Xiaoping Yang. "September 2006." Includes bibliographical references (p. 59). Also available in print.
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Lin, Han-Hsuan. "Handling of Environmental Related Requirements : Awareness and Ability to Act at Small and Medium Sized Electric and Electronic Companies." Thesis, Linköping University, Environmental Technique and Management, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-53182.
Повний текст джерелаАнотація:
Environmental related product requirements are increasing worldwide from government authorities, customers and other stakeholders. For small and medium sized companies manufacturing electric and electronic products it is more difficult compared to bigger companies to meet new product related requirements due to smaller budget, resources and knowledge. This research studies the awareness and ability to act upon changes when small and medium sized companies in Sweden face environmental related requirements.
The result is compared to previous conducted studies in a number of Asian countries. The study has been conducted through face-to-face interviews (12 companies), phone interviews (6 companies), and questionnaires (50 companies). After a preliminary literature study and targeting of objective companies interviews were made at first with the questionnaire study based on results from the interviews. In total, respondents from 68 companies participated in this research. Results from the study reveal that companies both in Sweden and Asia experience the same directives from EU and that WEEE and RoHS have had the biggest impact upon companies. Outside the EU market, companies do not comply with the legislations in the same way. There is a difference in how Swedish companies choose to treat environmental related product requirements as compared to electric and electronic companies in Asia. Furthermore, legislations are a very effective form to affect companies’ environmental work and adaptations, especially if it is imposed directly on the product itself. Both Swedish and Asian companies feel they need more education, more information about environmental related product requirements and more support from government authorities in order to cope with increasing demands from customers and legislations.
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Falahi, Khalil El. "Contribution à la conception de driver en technologie CMOS SOI pour la commande de transistors JFET SiC pour un environnement de haute température." Thesis, Lyon, INSA, 2012. http://www.theses.fr/2012ISAL0056/document.
Повний текст джерелаАнотація:
Dans le domaine aéronautique, les systèmes électriques remplacement progressivement les systèmes de contrôle mécaniques ou hydrauliques. Les bénéfices immédiats sont la réduction de la masse embarquée et des performances accrues à condition que l’électronique supporte l’absence de système de refroidissement. Si la haute température de fonctionnement n’empêche pas d’atteindre une fiabilité suffisante, il y aura réduction des coûts opérationnels. Des étapes clefs ont été franchies en introduisant des systèmes à commande électriques dans les aéronefs en lieu et place de systèmes conventionnels : freins électriques, inverseur de poussée, vérins électriques de commandes de vol… Toutes ces avancées se sont accélérées ces dernières années grâce entre autre à l’utilisation de nouveaux matériaux semiconducteurs, dit à grand gap (SiC, GaN…), opérant à haute température et palliant ainsi une faiblesse des dispositifs classiques en silicium (Si). Des composants de puissance haute température, diode Schottky ou transistor JFET SiC, sont ainsi disponibles commercialement et peuvent supporter des ambiantes de plus de 220°C. Des modules de puissances (onduleur) à base de transistor JFET SiC ont été réalisés et validés à haute température. Finalement la partie « commande » de ces modules de puissance reste à concevoir pour les environnements sévères pour permettre leur introduction dans le module de puissance. C’est dans ce contexte de faiblesse concernant l’étage de commande rapprochée qu’a été construit le projet FNRAE COTECH, et où s’inscrivent les travaux de cette thèse, Dans un premier temps, un état de l’art sur les drivers et leurs technologies nous a permis de souligner le lien complexe entre électronique et température ainsi que le potentiel de la technologie CMOS sur Silicium sur Isolant (SOI) pour des applications hautes températures. La caractérisation en température de drivers SOI disponibles dans le commerce nous a fourni des données d’entrée sur le comportement de tels dispositifs. Ces caractérisations sont essentielles pour visualiser et interpréter l’effet de la température sur les caractéristiques du dispositif. Ces mesures mettent aussi en avant les limites pratiques des technologies employées. La partie principale de cette thèse concerne la conception et la caractérisation de blocs ou IPs pour le cœur d’un driver haute température de JFET SiC. Elle est articulée autour de deux runs SOI (TFSmart1). Les blocs développés incluent entre autres des étages de sortie et leurs buffers associés et des fonctions de protection. Les drivers ainsi constitués ont été testés sur un intervalle de température allant de -50°C à plus de 250°C sans défaillance constatée. Une fonction originale de protection des JFETs contre les courts-circuits a été démontrée. Cette fonction permet de surmonter la principale limitation de ces transistors normalement passant (Normaly-ON). Finalement, un module de bras d’onduleur a été conçu pour tester ces driver in-situIn aeronautics, electrical systems progressively replace mechanical and hydraulic control systems. If the electronics can stand the absence of cooling, the immediate advantages will be the reduction of mass, increased performances, admissible reliability and thus reduction of costs. In aircraft, some important steps have already been performed successfully when substituting standard systems by electrical control system such as electrical brakes, thrust reverser, electrical actuators for flight control… Large band gap semiconductors (SiC, GaN…) have eased the operation in high temperature over the last decade and let overcome a weakness of conventional silicon systems (Si). High temperature power components such as Schottky diodes or JFET transistors, are already commercially available for a use up to 220°C, limited by package. Moreover inverters based on SiC JFET transistors have been realized and characterized at high temperature. Finally the control part of these power systems needs to be designed for harsh environment. It is in this context of lack of integrated control part that the FNRAE COTECH project and my doctoral research have been built. Based on a state of the art about drivers, the complex link between electronic and temperature and the potentialities of CMOS Silicon-On-Insulator technology (SOI) for high temperature applications have been underlined. The characterization of commercial SOI drivers gives essential data on these systems and their behavior at high temperature. These measurements also highlight the practical limitations of SOI technologies. The main part of this manuscript concerns the design and characterization of functions or IPs for high temperature JFET SiC driver. Two SOI runs in TFSmart1 have been realized. The developed functions include the driver output stage, associated buffers and protection functions. The drivers have been tested from -50°C up to 250°C without failure under short time-range. Moreover, an original protection function has been demonstrated against the short-circuit of an inverter leg. This function allows overcoming the main limitation of the normally on JFET transistor. Finally, an inverter module has been built for in-situ test of these new drivers
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Ben, Slimane Tarek. "A Xenon Collisional Radiative Model for Electric Propulsion Application : Determining the electron temperature in a Halleffect Thruster." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278506.
Повний текст джерелаАнотація:
Hall effect thrusters (HET) that rely on xenon as a propellant are widely adoptedtoday for their efficiency. To understand the kinetics of the xenon plasma dischargein the thruster, we developed a collisional radiative model for xenoninspired by the work of Karabadzhak et al. [1]. This model will be ultimatelycoupled with PIC simulations and OES measurements in the future. Themodel consists of 15 levels of xenon and accounts for electron-impact excitationsand radiative processes. Absorption was incorporated in the model usingthe escape factor approximation and the EEDF was assumed Maxwellian.First, test cases were carried out under the thermal equilibrium hypothesis.Then, non-equilibrium results were evaluated at the thruster conditions, allowingto understand the excited levels kinetics and produce a map describingthe dominant processes at these conditions.Second, the line ratio method by Karabadzhak et al. [1] was investigated usingour model. The line ratios were reproduced using a different approach andwere in a relatively good agreement for the 823-828 nm line ratio. For the 835-828 nm line ratio, differences were observed suggesting that other processesneed to be included.Halleffektmotorer (HET) som använderXenon som bränsle är idag vanliga ochanvänds pga sin höga effektivitet. För att förstå dynamiken bakom en Xenonplasmaurladdningi motorn har vi utvecklat en kollisions-radiativ (CR) modellför Xenon inspirerad av arbetet i Karabadzhak et al. [1]. Modellen kommer attkombineras med PIC-simuleringar och OES-mätningar. CR-modellen bestårav 15 nivåer av Xenon och inkluderar excitering från kollisioner med elektroneroch strålning. Absorption implementerades i modellen genom att användaen ”escape factor”-approximation och en maxwelliansk uppskattning avEEDF. De första mätningarna genomfördes med en hypotes om termisk jämvikt.Icke jämvikts-resultat jämfördes därefter med relevanta förhållanden förmotorerna, vilket gav en förståelse för excitationsnivåernas kinetik och ger enmodell som beskriver de dominanta processerna under dessa förhållanden.Därefter undersöktes metoden med kvoten av spektrallinjers intensitet frånKarabadzhak et al. [1] med den framtagna modellen. Kvoterna av spektrallinjersintensitet togs fram på ett annat sätt och överensstämde relativt väl förkvoten av spektrallinjerna 823-828 nm. För 835-828 nm-kvoten kunde skillnaderiakttas, vilket kan tyda på att andra processer behöver inkluderas.
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Rossouw, Frans Jacobus. "Analysis of voltage regulation and network support technologies." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51588.
Повний текст джерелаАнотація:
Thesis (MEng)--University of Stellenbosch, 2000.ENGLISH ABSTRACT: Recent advances in semiconductor device development pushed a large number of network devices onto the market. These devices can solve network problems more effectively and economically than ever before. Network planners need tools to analyse and implement such devices to help solve the largest network problem in South Africa: voltage regulation. Rural networks experience the majority of voltage-regulation problems in South Africa. The networks are long sub-transmission and reticulation networks and are modelled by two generic networks, namely a radial network and a two-source ring network. The equations describing voltage regulation for the generic networks are developed and implemented in PSAT, a software analysis tool. The voltage regulation for two case studies that represent the two generic networks are analysed. Four generic network devices are defined and various control methods for these devices are developed to solve the network problem. The aim of PSAT is to help the network planner to quickly evaluate a number of possible solutions and to choose the best solution for further studies. This is demonstrated with the aid of the case studies. PSAT provides a sturdy platform on which future developments, such as stability analyses, can be built. However, PSAT can already function as a stand-alone analysis tool to solve voltage regulation as a network problem.
AFRIKAANSE OPSOMMING: Onlangse vooruitgang in halfgeleier ontwikkeling het 'n groot aantal netwerktoestelle op die mark geplaas. Hierdie toestelle kan netwerk probleme doeltreffender en meer ekonomies oplos as ooit vantevore. 'n Behoefte aan 'n pakket wat netwerkbeplanners in staat stelom die netwerktoestelle te analiseer, is geïdentifiseer. So 'n pakket sal hulle help om die vernaamste netwerkprobleem in Suid-Afrika, nl. spanningsregulasie, op te los. Die oorgrote meerderheid spanningsregulasie probleme word op die platteland ondervind. Plattelandse netwerke word gekenmerk deur lang sub-transmissie en retikulasie netwerke. Hierdie netwerke word met behulp van twee generiese netwerke gemodelleer. 'n Radiale netwerk en 'n dubbelbron ringnetwerk word aangewend om enige plattelandse netwerk te analiseer. Vergelykings is vir spanningsanalise ontwikkel en in PSAT, 'n analitiese sagteware pakket, geïmplementeer. Twee gevallestudies is gedoen om die twee netwerke afsonderlik voor te stel en die vergelykings van PSAT te evalueer. Alle netwerktoestelle is in een van vier generiese kategorieë geklassifiseer. Modelle is vir elk van die kategorieë ontwikkel vtr spanningsregulasie analise. Die doel van PSAT is om die netwerk beplanner te help om vinnig en effektief soveel moontlik opsies te ondersoek as oplossings vir 'n spesifieke netwerk probleem. PSAT is reeds 'n alleenstaande pakket wat in die toekoms uitgebrei sal word om na die analise van stabilitietsprobleme te kyk.
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Gunn, Greg (Greg Marshall) 1970. "Web technologies for technology transfer and organizational learning in a production environment." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/46174.
Повний текст джерелаАнотація:
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; and, Thesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1998.Includes bibliographical references (leaves 71-72).
by Greg Gunn.
M.S.
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Pelyhe, Daniel, and Tuna Memisoglu. "How can Electric Vehiclesbecome the Dominant Design?" Thesis, KTH, Entreprenörskap och Innovation, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-42269.
Повний текст джерелаАнотація:
Due to technological developments and raising environmental concerns, vehicle industry is ina transformation process. Current dominant design in the industry is the internal combustionengine vehicle but there are already different alternative vehicles like electric vehicles (EV),hybrids, and vehicles running on ethanol or hydrogen. These alternatives started to expandand they are competing to have a strong position in the market. The question is whichtechnology (EV, hybrid, ethanol) will have an important position in the future. This studyfocuses on the progress of electric vehicles towards being the dominant design in the vehicleindustry and aims to give advices and suggestions to electric car manufacturers what theyshould develop and concentrate on in the future. To achieve this aim, interviews with Renaultand Stockholm Municipality is conducted and analyzed in detail. Many manufacturers areinterested in EV technology and started to invest in the technology to have a strong position inthe future. Although EVs are ready to expand, there are still some obstacles in their way.Some of these problems can be solved in a short term, while others, mostly technology relatedimprovements still require time.
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Башлак, Ірина Анатоліївна, Ирина Анатольевна Башлак, Iryna Anatoliivna Bashlak, and S. V. Chernobuk. "Military applications of electronic technologies." Thesis, Вид-во СумДУ, 2009. http://essuir.sumdu.edu.ua/handle/123456789/16860.
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Butchard, Dorothy Keziah. "Electric amateurs : literary encounters with computing technologies 1987-2001." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/10584.
Повний текст джерелаАнотація:
This thesis considers the portrayal of uncertain or amateur encounters with new technologies in the late twentieth century. Focusing on fictional responses to the incipient technological and cultural changes wrought by the rise of the personal computer, I demonstrate how authors during this period drew on experiences of empowerment and uncertainty to convey the impact of a period of intense technological transition. From the increasing availability of word processing software in the 1980s to the exponential popularity of the “World Wide Web”, I explore how perceptions of an “information revolution” tended to emphasise the increasing speed, ease and expansiveness of global communications, while more doubtful commentators expressed anxieties about the pace and effects of technological change. Critical approaches to the cultural impact of computing technologies have tended to overlook the role played by perceptions of expertise and familiarity, and my thesis seeks to redress this by identifying a broad range of imagery, language and cultural references used to depict amateur or inexpert encounters with computing technologies. My interest in literary representations of amateur or marginalised users of computing technology reveals how the ease and speed of reading and writing promised by technological expertise can be countered by uncertainty arising from limited understanding of the complex processes involved. In a pre-smartphone age, the computer loomed as an object which was simultaneously baffling and enchanting, filled with potential but also obscure in its fundamental workings. Examining instances within experimental literary fiction and poetry which portray, imply, or respond to, encounters with personal computing, I demonstrate how individuals’ attempts to understand a technologically-inflected world can be described and enacted by the use of unusual narrative and poetic devices, where experimental literary strategies work to recreate the complex sensations associated with thrilling, difficult, or incomprehensible aspects of information technologies.
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Roberts, Ivy. "Distant Electric Vision: Cultural Representations Of Television From “Edison’s Telephonoscope” To The Electronic Screen." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/4720.
Повний текст джерелаАнотація:
Do inventions that exist only on paper have less credibility than functional technologies? How has the meaning and significance of audiovisual media and technology changed over time? This dissertation examines historiography and methodology for media history, arguing for an interdisciplinary approach. It addresses methodological issues in media history—media in transition, media archaeology, and film history—through an examination of television’s speculative era. It tackles moving-image history through an historical investigation of Victorian and Machine age “television”.
Because the concept and terminology of “television” changed dramatically during this period, I use the phrases “distant electric vision” and “seeing by electricity,” to define the concept of electric and electronic moving-image technology. By identifying manifestations of “television” before functional models existed, this dissertation examines the ways in which a modern concept of moving-image technology came into existence. Engineers and inventors, as well as audiences and journalists contributed to the construction of “television.” Newspaper announcements, editorial columns, letters to the editor, rumors and satires circulated.
Victorian-era readers, writers and inventors pictured “seeing by electricity” to do for the eye what the telephone had done for the ear, bringing people closer together though separated
by great distances. In contrast, early twentieth-century Machine-age engineers placed more emphasis on systems, communication, design, and picture quality. Developments in the 1920s with complex systems and electronics made “distant electric vision” a reality.
This dissertation identifies several shifts that took place during television’s speculative era from the Victorian “annihilation of space” to Machine-Age systems engineering. Journalists, readers, and engineers all play a part in the rhetoric of innovation. From the Victorian era to the Machine age, the educational function of popular science and the role of audiences in constructing meaning and value for new technologies remain relatively consistent. I offer several case studies, including Thomas Edison’s inventions, illuminating engineering, and Bell Labs experiments with television. This dissertation argues that modern television design relies on the ability of the technology to make an unnatural experience seem as effortless as possible. Ultimately, it advocates for an expanded definition of media and technology, along with an historical emphasis on context.
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Vacek, Petr. "Modifikace vrstev deponovaných technologiemi HVOF a cold spray pomocí technologie elektronového paprsku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254211.
Повний текст джерелаАнотація:
The aim of this thesis was to modify microstructure and coating-substrate interface of CoNiCrAlY coatings deposited by HVOF and cold spray on Inconel 718 substrates. Electron beam remelting and annealing in a protective atmosphere were used to modify the coatings. Microstructure, chemical and phase composition were analyzed. The effect of beam current, transversal velocity and beam defocus on remelted depth was evaluated. As-sprayed microstructure and chemical composition of coatings were analyzed and compared with remelted samples. The effect of annealing of the as-sprayed and remelted samples was evaluated. Remelted layers exhibited dendritic structure. Chemical composition changed only after remelting of interface and part of a substrate. When only the coating was remelted, chemical composition remained the same. Phases coarsened after the annealing. Chemical composition changed after annealing due to the diffusion.
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Mou, Xiaolin. "Wireless power transfer technology for electric vehicle charging." Thesis, Durham University, 2017. http://etheses.dur.ac.uk/12416/.
Повний текст джерелаАнотація:
In the years 1884-1889, after Nicola Tesla invented "Tesla Coil", wireless power transfer (WPT) technology is in front of the world. WPT technologies can be categorized into three groups: inductive based WPT, magnetic resonate coupling (MRC) based WPT and electromagnetic radiation based WPT. MRC-WPT is advantageous with respect to its high safety and long transmission distance. Thus it plays an important role in the design of wireless electric vehicle (EV) charging systems. The most significant drawback of all WPT systems is the low efficiency of the energy transferred. Most losses happen during the transfer from coil to coil. This thesis proposes a novel coil design and adaptive hardware to improve power transfer efficiency (PTE) in magnetic resonant coupling WPT and mitigate coil misalignment, a crucial roadblock to the acceptance of WPT for EV. In addition, I do some analysis of multiple segmented transmitters design for dynamic wireless EVs charging and propose an adaptive renewable (wind) energy-powered dynamic wireless charging system for EV.
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SENA, FABRICIO ROBERTO. "EVOLUTION OF MOBILE PHONES TECHNOLOGY AND THE IMPACT ON THE WASTE OF ELECTRICAL AND ELECTRONIC EQUIPMENT." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2012. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=22231@1.
Повний текст джерелаАнотація:
Os produtos da indústria de eletroeletrônicos possuem alta empregabilidade no dia a dia. No entanto, por terem um ciclo de vida curto impactam na demanda por recursos naturais não renováveis. Dentro do universo de equipamentos eletroeletrônicos, os telefones celulares estão entre os mais complexos e os que empregam maior quantidade de elementos químicos diferentes. Apesar de pequenos, são vendidos aos milhares, em parte devido a sua curta vida útil. Esses fatores aliados indicam a existência de riscos à saúde e ao meio ambiente, o que faz repensar como destinar corretamente esses aparelhos no pós-consumo. A proposta do trabalho é fazer uma análise de como os telefones celulares impactam no volume e na complexidade dos Resíduos de Equipamentos Eletroeletrônicos, explicar a razão desse bem essencial ter uma vida útil tão curta e expor os motivos que tornam a sua reciclagem absolutamente necessária para continuar o seu desenvolvimento tecnológico, atender a demanda dos consumidores e reduzir o impacto ambiental da produção ao descarte.In the last century, through new production processes, the industry has increased the variety and availability of products offered to the population, providing better quality of life. This has happened because the inception of series production has offered a greater supply of consumer goods, including the Electrical and Electronic Equipment (EEE). The evolution of electronics technology has provided, and will continue to provide a better quality of life than the one we used to have. However, the technology of these products is continuously evolving, and this brings advantages and disadvantages.
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Thomas, Vincent. "Système multi-capteurs et traitement des signaux associé pour l'imagerie par courants de Foucault de pièces aéronautiques." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2010. http://tel.archives-ouvertes.fr/tel-00561478.
Повний текст джерелаАнотація:
Le vieillissement du parc aéronautique, mais aussi la volonté de prolonger le cycle de vie des appareils, impose aux techniques de maintenance des exigences de contrôle accrues en termes de fiabilité et de rapidité. Les principaux enjeux étant la détection, et surtout la caractérisation des micro-fissures pouvant apparaitre dans les pièces sensibles des appareils. Cette caractérisation pouvant aller jusqu'à la reconstruction qualitative, voire quantitative du profil des fissures, ce qui suppose la résolution du problème inverse consistant, à partir des signaux mesurés, à remonter à certaines caractéristiques de la pièce inspectée, notamment géométriques, qui en sont en partie la cause.Ce manuscrit présente une approche originale de conception de sonde d'imagerie par courants de Foucault. Cette approche, ici appliquée à l'imagerie de pièces aéronautiques cylindriques, consiste à concevoir la sonde de façon à satisfaire la double contrainte d'une instrumentation performante et d'une résolution possible du problème inverse. Ainsi, la conception de la sonde est-elle faite de manière à ce que d'une part les signaux mesurés, résultant de ses interactions avec la pièce contrôlée, soient d'amplitude la plus élevée possible, et d'autre part, a n que ces interactions soient modélisables au moyen d'un modèle qui se prête bien à l'inversion.Dans un premier temps, une méthodologie de conception de sonde est présentée, qui vise à optimiser le dimensionnement et l'agencement de ses éléments en se fixant des contraintes de sensibilité et de résolution. Un prototype, conçu d'après cette méthodologie, est réalisé, mis en œuvre et caractérisé. Les résultats expérimentaux obtenus, qui s'avèrent en accord avec une modélisation par éléments finis, offrent une validation du fonctionnement de la sonde, celle-ci permettant effectivement de mettre en évidence les défauts types (micro-fissures) recherchés dans la pièce inspectée. Dans un second temps, la configuration des interactions sonde-pièce inspectée, choisie à dessein, est mise à profit pour élaborer un modèle direct. Celui-ci repose sur l'hypothèse selon laquelle, les défauts étant de faibles dimensions, il est possible de considérer que la perturbation de signal qu'ils engendrent est équivalente à celle que génèreraient des sources virtuelles de courants localisées uniquement dans le volume du défaut. Outre sa simplicité, cette modélisation offre l'avantage d'être adaptée à une mise en œuvre au moyen de la méthode des points sources distribués. Or celle-ci permet de formuler le problème direct sous forme matricielle ce qui constitue une base de nature à faciliter la résolution du problème inverse.C'est à ce problème qu'est consacrée la dernière partie du mémoire. Des méthodes d'inversion y sont proposées, visant à traiter progressivement la complexité du problème. Ainsi un algorithme d'inversion mono-fréquence est-il proposé, qui se montre efficace pour reconstruire des défauts sur de faibles profondeurs. Pour une meilleure reconstruction en profondeur, des algorithmes multifréquence faisant appel à des méthodes de régularisation sont ensuite conçus et appliqués à des signaux correspondant à des défauts de géométries diverses.
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Zhang, Rui. "Impact of emerging technologies on the cell disruption and fractionation of microalgal biomass." Thesis, Compiègne, 2020. http://www.theses.fr/2020COMP2548.
Повний текст джерелаАнотація:
Ce travail de recherche se concentre sur l'extraction et le fractionnement des biomolécules à partir de microalgues par des traitements physiques: les champs électriques pulsés (CEP), les décharges électriques de hautes tensions (DEHT) et les ultrasons (US). Dans cette étude, trois espèces de microalgues Nannochloropsis sp., Phaeodactylum tricornutum (P. tricornutum) et Parachlorella kessleri (P. kessleri) ont été étudiées. Les espèces ont différentes formes cellulaires, structure et contenu intracellulaire. L'effet des techniques testées sur l'extraction des biomolécules a été mis en évidence à travers une analyse quantitative et qualitative: suivi du rendement des composés ioniques, des glucides, des protéines, des pigments et des lipides. Une étude comparative des traitements physiques (CEP, DEHT et US), à la même énergie, pour la libération des biomolécules intracellulaires à partir des trois espèces de microalgues, a permis de mieux comprendre les différents mécanismes de désintégration. Pour chaque microalgue, à la même énergie consommée, le traitement par DEHT s'est révélé le plus efficace en terme d'extraction des glucides, tandis que les US sont plus efficaces pour l'extraction des protéines et des pigments. Le traitement par CEP a été moins efficace en terme du rendement d’extraction. Cependant, la meilleure sélectivité (extraction des glucides) a été obtenue en utilisant les CEP ou les DEHT. Les prétraitements physiques (CEP, DEHT ou US) des suspensions plus concentrées suivis d'une homogénéisation haute pression (HHP) de suspensions diluées ont permis d'améliorer l'efficacité de l'extraction et de diminuer la consommation énergétique totale et le nombre de passages. Le prétraitement physique permet de réduire la pression mécanique de l’HHP, pour atteindre le même rendement d’extraction. Pour la valorisation maximale de la biomasse de microalgues, une procédure d'extraction assistée par DEHT (40 kV/cm, 1-8 ms) suivie de plusieurs étapes d'extraction aqueuses et non aqueuses semble être utile pour l'extraction sélective et le fractionnement de différentes biomolécules à partir de microalgues. Des effets significatifs du prétraitement HVED sur l'extraction par solvant organique des pigments (chlorophylles, caroténoïdes) et des lipides ont été observésThis research work focuses on extraction and fractionation of bio-molecules from microalgae using physical treatments: pulsed electric fields (PEF), high voltage electrical discharges (HVED) and ultrasonication (US) techniques. In this study, three microalgae species Nannochloropsis sp., Phaeodactylum tricornutum (P. tricornutum) and Parachlorella kessleri (P. kessleri) were investigated. These species have different cell shapes, structure and intracellular contents. The effects of tested techniques on extraction of bio-molecules have been highlighted in a quantitative and qualitative analysis by evaluating the ionic components, carbohydrates, proteins, pigments and lipids. A comparative study of physical treatments (PEF, HVED and US) at the equivalent energy input for release of intracellular bio-molecules from three microalgal species allowed us to better understand the different disintegration mechanisms. For each microalga at the same energy consumption, the HVED treatment proved to be the most efficient for extraction of carbohydrates, while the US treatment for extraction of proteins and pigments. In general, the smallest efficiency was observed for the PEF treatment. However, the highest selectivity towards carbohydrates can be obtained using the mild PEF or HVED technique. The preliminary physical treatments (PEF, HVED or US) of more concentrated suspensions followed by high pressure homogenization (HPH) of diluted suspensions allowed improving the extraction efficiency and decreasing the total energy consumption. The physical pretreatments permit to reduce the mechanical pressure of the HPH and number of passes, to reach the same extraction yield. For the maximum valorisation of microalgal biomass, extraction procedure assisted by HVED treatment (40 kV/cm, 1-8 ms) followed by aqueous and non-aqueous extraction steps seems to be useful for selective extraction and fractionation of different bio-molecules from microalgae. The significant effects of HVED pre-treatment on organic solvent extraction of pigments (chlorophylls, carotenoids) and lipids were also observed
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Vardalas, John N. "Moving up the learning curve, the digital electronic revolution in Canada, 1945-70." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21032.pdf.
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Goel, Vishu. "Novel coating technologies for electrical steels." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/93813/.
Повний текст джерелаАнотація:
Power loss in transformer cores accounts for approximately 5% of the energy lost as heat. The loss could be reduced by improving the secondary recrystallization methods, grain orientation control, increasing the electrical resistivity of the steel, reducing the thickness of laminations, manipulating the domain structure and applying coatings. Coating grain oriented electrical steel (GOES) helps in reducing the loss by providing electrical resistance, improving the surface roughness and applying beneficial tensile stress. In this work a range of coatings were explored that can be economically applied on GOES to reduce power loss and magnetostriction in working transformers. Coatings were investigated using a range of coating processes including electroless plating, thermal evaporation physical vapour deposition and electron beam physical vapour deposition. The coatings were characterised using a range of processes including Single Strip Testing (SST), Magnetostriction measurement, Vibrating Sample Magnetometer (VSM), magnetic domain imaging, Optical microscopy, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS), X-ray Diffraction (XRD), Surface profilometry, Atomic force microscopy and Raman spectroscopy. Co-Ni-P applied on GOES improved the magnetic properties by applying beneficial tensile stress which aligns the domains in the direction of magnetization and by improving the surface roughness which reduces the number of pinning sites on the surface of steel. The magnetostriction was improved due to the effect of beneficial tensile stress. Similarly Co-PCNT applied on GOES reduced the power loss by improving the surface roughness. CrN, CrAlN, TiAlN improved the power loss and magnetostriction as tensile stress was applied by the coatings which reduced the domain width and hence loss was reduced. The reduction in magnetostriction was due to the high value of Young’s modulus of the coatings as compared to GOES which did not allow the steel to expand under the influence of applied magnetic field. The ceramic coatings could be directly employed in the production line replacing the phosphate coating unit with the Chemical/Physical vapour deposition.
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Joshi, Yakshit, and Deepak Dinesh. "Standardizing Electric Road : Factors affecting the Business Model for Electric Road Systems." Thesis, Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-43675.
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Ladendorff, Marlene Z. "The effect of North American Electric Reliability Corporation critical infrastructure protection standards on bulk electric system reliability." Thesis, Capella University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3640275.
Повний текст джерелаАнотація:
Compliance with regulations may not automatically produce a secure infrastructure. In the United States energy critical infrastructure sector, compliance with regulatory cyber security standards may not necessarily mean that an entity would be able to withstand a cyber attack on critical assets potentially supporting the reliability of the Bulk Electric System (BES). This qualitative exploratory inquiry study researched technical opinions of cyber security professionals in the energy critical infrastructure industry regarding the effect of the North American Electric Reliability Corporation (NERC) Critical Infrastructure Protection (CIP) standards on the reliability of the BES. NERC entities had been required to be compliant with the standards for several years at the time this study was undertaken. There has been speculation regarding the efficacy of the standards to impact the reliability of the BES. However, there was a lack of scholarly or professional literature confirming assumptions concerning BES reliability. In this study, data was gathered through interviews with individuals who were CIP implementation experts. The purpose of this study was to identify a theme or themes regarding changes in the reliability of the BES as a result of the NERC CIP standards implementation. Interview data from the study generated 9 themes including a theme for the research question indicating that reliability of the BES had improved as a result of the implementation and enforcement of the CIP standards. Some of the more prominent themes included NERC fines having influenced entities in the implementation of the standards; entities have been more concerned about CIP compliance than securing their equipment; and entities have removed equipment from their facilities in order to avoid the requirements, and the associated expense, the standards would demand.
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Qin, Helen. "Powertrain technology and cost assessment of battery electric vehicles." Thesis, UOIT, 2010. http://hdl.handle.net/10155/86.
Повний текст джерелаАнотація:
This thesis takes EV from the late 90’s as a baseline, assess the capability of today’s EV technology, and establishes its near-term and long-term prospects. Simulations are performed to evaluate EVs with different combinations of new electric machines and battery chemistries.
Cost assessment is also presented to address the major challenge of EV commercialization. This assessment is based on two popular vehicle classes: subcompact and mid-size. Fuel, electricity and battery costs are taken into consideration for this study. Despite remaining challenges and concerns, this study shows that with production level increases and battery price-drops, full function EVs could dominate the market in the longer term. The modeling shows that from a technical and performance standpoint both range and recharge times already fall into a window of practicality, with few if any compromises relative to conventional vehicles. Electric vehicles are the most sustainable alternative personal transportation technology available to-date. With continuing breakthroughs, minimal change to the power grid, and optimal GHG reductions, emerging electric vehicle performance is unexpectedly high.
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Jeon, Sang Yeob. "Hybrid & electric vehicle technology and its market feasibility." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59252.
Повний текст джерелаАнотація:
Thesis (S.M. in System Design and Management)--Massachusetts Institute of Technology, Engineering Systems Division, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 79-83).
In this thesis, Hybrid Electric Vehicles (HEV), Plug-In Hybrid Electric Vehicle (PHEV) and Electric Vehicle (EV) technology and their sales forecasts are discussed. First, the current limitations and the future potential of vehicle technology for HEVs, PHEVs, and EVs are investigated. Second, factors that have historically impacted vehicle sales in the United States are examined. The examination focuses on the effect of rising gasoline prices on the U.S. vehicle market for the periods which include three significant events involving gasoline prices: the Iran and Iraq war in 1979, Hurricane Katrina in 2005, and the recession of 2008. Finally, many parts of this thesis deal with sales forecasts of HEVs, PHEVs, and EVs up to 2030. While previous research used the unmodified Bass diffusion model or Generalized Bass model in order to examine the adoption rate of EVs, through using Norton-Bass Model and inserting Generalized Bass Model into Norton-Bass Model, this study seeks to overcome the limitation of Bass diffusion model, which has a fixed saturation level in order to generate more accurate projections.
by Sang Yeob Jeon.
S.M.in System Design and Management
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Sanz, Desco Raul. "Life Length and Stress Tests of Electric Machines for Electric Vehicles." Thesis, KTH, Skolan för kemivetenskap (CHE), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-214554.
Повний текст джерелаАнотація:
Electrical machines have been widely used along the last decades with large life length under operating conditions. However, they will become more important in the upcoming years because of the emerging electric car industry. Thus, the maintenance cost of this technology can be reduced by extending the lifetime in the electrical machines. Despite the fact that existing numerous studies within the life length in these devices, only few study the effect of the thermomechanical stresses of insulation. The core of this master thesis is to study the influence of these stresses in the insulation material of a winding. The tested electrical machines were subjected to different test conditions, allowing to analyse multiple aging effects in the winding. To achieve these effects, power cycling tests were carried out on stators, where the windings were tested in cycles with different ΔT and two cooling methods: air cooling and oil cooling. The results showed large aging differences between the two cooling methods employed. The aging effect in the oil cooling method was higher than in the air cooling method for the same number of cycles. However, the aging effects regarding the same cooling process had not wide differences between the different test temperatures.
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黃志明 and Chi-ming Simon Wong. "Electronic mail: technology, applications andinfrastructure." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B3126511X.
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O'Neill, Peter R. "Enhancing electronic assistive technology prescription." Thesis, Sheffield Hallam University, 2006. http://shura.shu.ac.uk/20147/.
Повний текст джерелаАнотація:
With the inherent functional flexibility of the computer it seemed inevitable that these machines would be put to use in assisting individuals with less functional ability such as the severely physically disabled. These functions would include Speaking, Writing, Controlling their surroundings and moving within those environments. The software applications which provide these functions have collectively become known as Integrated Electronic Assistive Technology (IEAT). This research investigation focused on the prescription of an IEAT prescribed for a particular individual using the Barnsley Wheelchair Interface (BWI) to enable the individual's function of mobility. The BWI controlled an electric wheelchair via a single switch pressed by the user, using her head and was prescribed using the "Multi-Disciplinary Service Model" process created and described by Hawley (1995).The subsequent enhancement of this prescription, from the model-based analysis of the automatically generated usage data logs, that were introduced by the PhD Research student and are one of the novel features of this work. The chosen method, using the analysis of data logs came about as a result of the PhD Research student's own severe physical disability rendering conventional techniques difficult and in some cases impossible. It is the model-based analysis processes that have been developed during this research and which inform the Assistive Technology Professional (ATP) with general information on the prescription, along with comprehensive information on 'Whole System Information', 'Functional Level Information' and 'Interface Level Information', which in all instances had previously been unavailable from assistive technology stakeholders. It is speculated that with the use of these analysis processes (tools) in addition to a software application called "Switch Environment Assessment Tool" (SEAT), in conjunction with the iterative process within the service model, the prescription should be enhanced, resulting in an increase in the user's quality of life.
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Navarret, Benoît. "Caractériser la guitare électrique : définitions, organologie et analyse de données verbales." Paris 8, 2013. http://octaviana.fr/document/180886118#?c=0&m=0&s=0&cv=0.
Повний текст джерелаАнотація:
Cette thèse est une approche pluridisciplinaire de caractérisation de la guitare électrique selon des points de vue complémentaires permettant de mieux la qualifier et lui donner un statut d’objet d’étude dans un cadre musicologique aux méthodes renouvelées. La première partie est une présentation des outils essentiels qui composent l’environnement de l’instrument et du musicien. Elle traite de l’électrification de la guitare, de sa configuration matérielle, de la relation du musicien à l’instrument et de l’importance du studio comme référence sonore. La deuxième partie est une étude organologique sur les trois modèles de guitare électrique solidbody de référence (Fender Telecaster, Stratocaster et Gibson Les Paul) ainsi que de solutions alternatives. Cette approche démontre que la guitare électrique subsiste sous des formes extrêmement diversifiées malgré des archétypes aujourd’hui très répandus qui se sont imposés mondialement. La troisième partie est consacrée au discours de guitaristes qui ont livré leur définition de la guitare électrique dans le cadre d’études perceptives inédites. Des données verbales ont été recueillies et analysées. Les résultats présentés portent sur les représentations des marques et modèles, et l’étude du vocabulaire de cette communauté de musiciens. L’ensemble de ce travail s’inscrit dans le cadre d’une collaboration interdisciplinaire entre des équipes de recherche en musicologie, psychologie/linguistique et mécaniqueThis thesis is a multidisciplinary approach which characterizes the electric guitar in complementary perspectives to qualify it and give it the status of subject of study in a musicological framework for renewed methods. The first part is a presentation of the essential tools that make up the environment of the instrument and the musician. It deals with the electrification of the guitar, its hardware configuration, the relationship of the musician to the instrument and the influence of studio audio techniques in music production. The second part is an organological study of the most famous models of solidbody electric guitars (Fender Telecaster, Stratocaster and Gibson Les Paul) and some alternatives. This approach shows that the electric guitar remains in extremely varied forms today despite widespread archetypes that have become a benchmark worldwide. The third part is devoted to the speech of guitarists who gave their own definition of the electric guitar under unusual perceptual studies. Verbal data were collected and analyzed. The results presented relate to the representations of brands and models, and the study of the vocabulary of this community of musicians. All of this work is part of an interdisciplinary collaboration between research teams in musicology, psychology/linguistics and mechanics
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Dailey, R. Gordon Jr. "An analysis of renewable energy technologies for electric utilities in Georgia." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/28922.
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Steinhausen, Natasha. "Applications of the electric potential sensor for healthcare and assistive technologies." Thesis, University of Sussex, 2014. http://sro.sussex.ac.uk/id/eprint/48596/.
Повний текст джерелаАнотація:
The work discussed in this thesis explores the possibility of employing the Electric Potential Sensor for use in healthcare and assistive technology applications with the same and in some cases better degrees of accuracy than those of conventional technologies. The Electric Potential Sensor is a generic and versatile sensing technology capable of working in both contact and non-contact (remote) modes. New versions of the active sensor were developed for specific surface electrophysiological signal measurements. The requirements in terms of frequency range, electrode size and gain varied with the type of signal measured for each application. Real-time applications based on electrooculography, electroretinography and electromyography are discussed, as well as an application based on human movement. A three sensor electrooculography eye tracking system was developed which is of interest to eye controlled assistive technologies. The system described achieved an accuracy at least as good as conventional wet gel electrodes for both horizontal and vertical eye movements. Surface recording of the electroretinogram, used to monitor eye health and diagnose degenerative diseases of the retina, was achieved and correlated with both corneal fibre and wet gel surface electrodes. The main signal components of electromyography lie in a higher bandwidth and surface signals of the deltoid muscle were recorded over the course of rehabilitation of a subject with an injured arm. Surface electromyography signals of the bicep were also recorded and correlated with the joint dynamics of the elbow. A related non-contact application of interest to assistive technologies was also developed. Hand movement within a defined area was mapped and used to control a mouse cursor and a predictive text interface.
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Balani, Spandana. "Smart Grid Technologies for Efficiency Improvement of Integrated Industrial Electric System." ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/115.
Повний текст джерелаАнотація:
The purpose of this research is to identify the need of Smart Grid Technologies in communication between industrial plants with co-generation capability and the electric utilities in providing the most optimum scheme for buying and selling of electricity in such a way that the fuel consumption is minimized, reliability is increased, and time to restore the system is reduced. A typical industrial plant load profile based on statistical mean and variance of industrial plants' load requirement is developed, and used in determining the minimum cost of producing the next megawatt-hours by a typical electric utility. The 24-hour load profile and optimal power flow program are used to simulate the IEEE 39 Bus Test System. The methodology for the use of smart grid technology in fuel saving is documented in the thesis. The results obtained from this research shall be extended to include several industrial plants served by electric utilities in future work by the UNO research team.
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Zhang, Fan. "Electric and electrochemical responses of adherent cells : application of microfabrication technologies." Paris 6, 2011. http://www.theses.fr/2011PA066194.
Повний текст джерелаАнотація:
La connaissance des comportements cellulaires tels que l'adhésion, migration et prolifération cellulaire est importante pour l'ingénierie tissulaire et de l'implantologie. Ce travail de thèse a été développé pour obtenir une vision plus claire sur les activités cellulaires in-vitro en utilisant des substrats micro/nanofabriqués et des méthodes d’analyses électriques/électrochimiques. Des substrats avec des motifs divers et variés, incluant des nanoélectrodes de haute densité et des microstructures à trois dimensions, ont été obtenu pour culture cellulaire et analyse par méthodes électriques ou électrochimiques. L’intégration de ces structures dans un dispositif microfluidique a été également démontrée. L'adhésion, migration et prolifération cellulaire ainsi que l'activité métabolique des cellules ont été étudié par mesure de voltamétrie cyclique et d'impédance électrique. En combinaison avec les techniques optiques pour l'observation de la morphologie cellulaire et la densité de cellules, les mesures électriques ou électrochimiques nous ont permis d’étudier des nouveaux effets de substrats ou électrodes micro et nano-structurés sur la culture cellulaire et les activités métaboliques de cellules en culture
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Stenbro, Martine. "A Survey of Modern Electronic Voting Technologies." Thesis, Norwegian University of Science and Technology, Department of Telematics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10906.
Повний текст джерелаАнотація:
The last decade, electronic voting has evolved from being a mean of counting votes to also offer the possibility of electronically casting votes. From recording votes using punch cards and optical scan systems, electronic voting has evolved into the use of direct-recording-electronic machines. Voting over the Internet has also become a hot research topic, and some implementation and testing have been done. Internet voting systems are significantly more vulnerable to threats from external attackers, than systems to cast ballots in controlled environments. Mechanisms to provide security, accuracy and verification are critical, and issues with coercion and usability also arise.In the first part of this thesis we give a theoretical study about existing electronic voting techniques, as well as requirements and security issues of modern electronic voting systems. We also give a brief background theory of some cryptographic mechanisms and systems. Secondly, we present two modern voting solutions in development. We have included security functionalities provided by the system, the cryptographic techniques used and some threats and attacks to the systems. These systems can be exposed to compromised computers, ballot stuffing, and corrupt infrastructure players, but are using cryptographic proofs to ensure accuracy and counter attacks.In the third part, we create a procedure and perform a usability test on one of these modern voting solutions. Our findings emphasize the fact that there is a tension between verifiable elections and usability. The voters have trust in the privacy and accuracy of such a voting systems if more guidance to utilize the means of verification is included, and a trusted third party verifies the system security. The advantages of electronic voting outweigh the risks. Internet voting is a term of further discussion and testing, but considering coercion and the insecure aspects of the medium, Internet voting will never be 100% safe. It is a question of trade off between the advantages and threats.