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En studie av metodbyte vid sintring av hårdmetaller till mikrovågsintring samt dess ekonomiska fördelar : Självständigt arbete i teknisk fysik med materialvetenskap & Självständigt arbete i kemiteknik / A study of the change in methodology at the sintering of hard metals to microwavesintering and its economic benefits : Självständigt arbete i teknisk fysik med materialvetenskap & Självständigt arbete i kemiteknikVargas, Ernesto, Färnlund, Kim, Bäcklin, Annika, Karlsson, Karolin, Massoud, George, Renman, Viktor, Björklund, Erik January 2010 (has links)
The aim with this study was to investigate the effects a change of manufacturing process would have on the mechanical properties of drill bits made of a WC/Co composite used for stone cutting. The method used today is sintering, where the material is heated in a conventional sintering oven. The other method was microwave sintering, where the material is heated by radiation in the microwave region. Also an investigation of the manufacturing cost were made. The main difference between the two heating methods is that the conventional way is a rather slow process and the microwave method is very fast. The material is also heated homogeniously in the method with mirowaves, aposed to the case with the conventional sintering where the material is heated from the outside in. This makes the material harder and more wear resistent. Another positive effect is that the pysical properties of the drill bits is easier to controll, because of the very small grain growth due to the short process time.The cost of manufacturing these drill bits by microwave sintering does not exceed the cost of the conventionall sintering.
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Design and development of a test apparatus for a downhole tool metal face mechanical sealAlajbegovic, Vahidin 08 1900 (has links)
No description available.
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Numerical simulation of continuous miner rock cutting processYu, Bo, January 1900 (has links)
Thesis (Ph. D.)--West Virginia University, 2005 / Title from document title page. Document formatted into pages; contains xiii, 124 p. : ill. (some col.) Includes abstract. Includes bibliographical references (p. 109-112).
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Investigation of the effect of waterjet created slots in improving the performance of tricone drill bits in hard rock /Pederick, Stuart. January 2005 (has links) (PDF)
Thesis (M.Eng.Sc.) - University of Queensland, 2005. / Includes bibliography.
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Obtenção de portas lógicas quânticas em condensados de bose-einstein / Object of quositic logical doors in condensed bose-einsteinAlbuquerque, Rosângela Marques de 10 1900 (has links)
ALBUQUERQUE, R. M. Obtenção de portas lógicas quânticas em condensados de bose - Einstein. 2017. 77 f. Dissertação (Mestrado em Engenharia Elétrica e da Computação) - Campus de Sobral, Universidade Federal do Ceará, Sobral, 2017. / Submitted by Programa de Pós-Graduação Engenharia Elétrica e de Computação (secretaria_ppgeec@sobral.ufc.br) on 2017-10-31T21:38:15Z
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Previous issue date: 2017-10 / Bose-Einstein condensate (BEC) coupled is a promising candidate to quantum computing. Being a macroscopic quantum phenomenon, Being a strong quantum system (BÖIH et al., 2009), its assembly and experimental control inside an atomic chip (HÄNSEL et al.,2001), further the optical networks (GREINER OLAF MANDEL, 2001), where it is found and manipulated in different network sites, assuring implementation conditions of Quantum Information Protocol. The definition of a Qubit in BECs was proposed considering the couple of two BEC’s in different hyperfine states throught a two-photon transition. We have identified each one of the condensates in their respective hyperfine levels like the states and the Qubit. Experimentally, it is possible both the identification of atoms that ate in each one of the hyperfine levels and the measurement of the condensate phase. With these information is possible to determine the superposition coefficients .
In this coursework, we have studied the dynamics of two Bose-Einstein condensate (BEC) on its fundamental state, trapped and coupled by a quantum tunneling. Because of this coupling, there is population transference between two condensed modes. The coupling is adjusted in a way we have probability of occupation in two levels. We have shown that this system can be considerate viable to a Qubit. So, we have simulated the quantum gates NOT and Hadamard. / Condensados de Bose-Einstein (CBE) acoplados é candidato promissor à computação quântica. Por ser um fenômeno quântico macroscópico, por ser um sistema quântico robusto (BÖHI et al., 2009), por sua montagem e controle experimental dentro de um chip atômico (HÄNSEL et al., 2001), além das construções em redes ópticas (GREINER OLAF MANDEL, 2001), onde são localizados e manipulados em diferentes sítios da rede, garantindo condições de implementação de protocolos de Informação Quântica. A definição de um q-bit em CBEs foi proposta considerando o acoplamento de dois CBEs em diferentes estados hiperfinos através de uma transição de dois fótons. Identificamos cada um dos condensados nos seus respectivos
níveis hiperfinos como os estados j0i e j1i do q-bit. Experimentalmente, é possível tanto a identificação dos átomos que estão em cada um dos níveis hiperfinos quanto a medição da fase dos condensados. Com estas informações é possível determinar os coeficientes de superposição a j0i+b j1i. No presente trabalho, estudamos a dinâmica de dois condensados de Bose - Eisntein (CBE) no estado fundamental, armadilhados e acoplados por tunelamento quântico. Devido a esse acoplamento, há transferência de população entre os dois modos condensados. O acoplamento é ajustado de maneira que tenhamos probabilidade de ocupação em dois níveis. Demonstramos que este sistema pode ser considerado viável a um q-bit. Então, simulamos as portas quânticas NOT e Hadamard.
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GMSK Demodulation Methods and ComparisonsBishop, Daniel W. 02 September 2008 (has links)
No description available.
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Episode 7.02 – Clearing Bits using the Bitwise-ANDTarnoff, David 01 January 2020 (has links)
Clearing bits within an integer is important if we want to isolate bits or set them to zero before we insert a new value. The bitwise-AND does this for us.
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EVALUATION PREDICTIVE DE LA SURETE DE FONCTIONNEMENT D'UN CIRCUIT INTEGRE NUMERIQUEHADJIAT, K. 10 June 2005 (has links) (PDF)
La probabilité des fautes transitoires augmente avec l'évolution des technologies. Ceci a suscité un intérêt croissant pour les méthodes prédictives d'analyse des comportements erronés d'un circuit. Ce travail porte sur l'étude de deux aspects complémentaires : l'injection de fautes dans des circuits décrits au niveau RTL et l'analyse des résultats obtenus à l'issue de campagnes d'injection.<br />Nous présentons une nouvelle approche pour la génération de mutants, permettant l'instrumentation d'un circuit pour des modèles de fautes hétérogènes. Pendant la définition d'une campagne d'injection de fautes, le flot d'analyse que nous avons proposé permet au concepteur d'introduire, dans le même circuit, des inversions de bits uniques (SEU) ou multiples (MBF), ou encore des transitions erronées. En outre, nous avons visé une génération de mutant la plus efficace selon plusieurs contraintes qui incluent (1) la modification simple et automatique de la description initiale du circuit, (2) l'optimisation des entrées additionnelles pour le contrôle d'injection et (3) la réduction du surcoût matériel après synthèse pour une bonne compatibilité avec des campagnes d'injection de fautes basées sur l'émulation.<br />Dans le flot d'analyse, un modèle comportemental est généré permettant au concepteur d'identifier les chemins de propagation d'erreurs dans le circuit. Une telle analyse vise à identifier, très tôt dans le flot de conception, les modes de défaillance inacceptables d'un circuit afin de modifier immédiatement sa description et ainsi améliorer sa robustesse.<br />Nous présentons des résultats obtenus suite à des injections multi niveaux dans des descriptions VHDL de circuits numériques. Ces résultats démontrent qu'une campagne d'injection réalisée très tôt dans le processus de conception, sur une description encore très éloignée de l'implémentation finale, peut donner des informations très utiles sur les caractéristiques de sûreté d'un circuit.
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Understanding retargeting compilation techniques for network processorsLi, Jun January 2003 (has links)
Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.
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Transmissão DSL em modo fantasma: medições e avaliação de desempenhoGOMES, Diego de Azevedo 07 December 2012 (has links)
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Previous issue date: 2012 / CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico / ERICSSON Telecomunicações S.A. / A demanda por taxa de bits vem aumentando a cada ano, devido principalmente pela incorporação de aplicativos online ao cotidiano das pessoas. Assim, as companhias prestadoras deste tipo de serviço estão sempre investindo em pesquisa por tecnologias que possibilitem o aumento da taxa de bits com um bom custo-benefício. Seguindo esta perspectiva, este trabalho apresenta o modo de transmissão fantasma (Phantom mode), que visa aumentar a taxa total de transmissão de bits em sistemas DSL, quando múltiplos pares de cobre estão disponíveis. Aqui também são mostrados resultados e discussões importantes sobre desempenho do modo de transmissão fantasma. Também são discutidos procedimentos para a execução de medições de modo fantasma em frequências de 100 kHz a 300 MHz, em uma maneira que permite a medição de modo fantasma e modo diferencial com o mesmo setup. Novos resultados são apresentados sobre canal direto, far-end crosstalk (FEXT) e conversão de modo, para um cabo Cat-5e de 50 metros. Dentre outros fatos, foram verificadas grandes diferenças no canal direto de modo fantasma quando foram comparadas medições com cabo enrolado e desenrolado, e que a forma como o modo fantasma _e construção da influência bastante no comportamento das curvas de canal direto, FEXT e conversão de modo. Também são apresentados resultados de estimação da taxa de bits quando são usados modo fantasma e modo diferencial simultaneamente, e observou-se que ha um ganho de ate 60% quando foram usados este dois modos e vectoring. / Demand for bit rate is increasing every year, mainly due to the incorporation of online applications into people's life. So the companies which provide this type of service are always investing in research for technologies that enable increased bit rate with a good value for money. Following this perspective, this paper presents transmission phantom mode, which aims to increase the overall rate of transmission of bits in DSL systems when multiple copper pairs available. Here we also show results and discussions on performance of phantom mode. We discuss procedures for performing measurements in phantom mode at frequencies from 100 kHz to 300 MHz, in a way that allows the measurement of phantom mode and deferential mode with the same setup. New results are presented on the direct channel, far-end crosstalk (FEXT) and mode conversion for a Cat-5e cable of 50 meters. Among other facts, we verify large deference’s in the direct channel phantom mode when comparing rolled and unrolled
cable measurements, and that manner how we build the phantom mode greatly inuences the behavior of the curves of direct channel, FEXT and mode conversion. We also present results of estimating bit rate when using phantom mode and deferential mode simultaneously, and observed that there is a gain of up to 60 when we use this two modes and vectoring.
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