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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
61

Grinding polycrystalline diamond using a diamond grinding wheel

Agahi, Maryam. January 2006 (has links)
Thesis (M.Eng.)--University of Wollongong. / Typescript. Includes bibliographical references: leaf 131-135.
62

Growth of nitrogen doped diamond using inductively coupled thermal plasma CVD

Azem, Amir. January 1900 (has links)
Thesis (M.Eng.). / Written for the Dept. of Chemical Engineering. Title from title page of PDF (viewed 2008/07/29). Includes bibliographical references.
63

Magmatic evolution, xenolith mineralogy, and emplacement history of the Aries micaceous kimberlite, central Kimberley Basin, Western Australia /

Downes, Peter. January 2006 (has links)
Thesis (Ph.D.)--University of Western Australia, 2006.
64

Synthesizing diamond films from low pressure chemical vapor deposition /

Freeman, Mathieu Jon. January 1990 (has links)
Thesis (M.S.)--Rochester Institute of Technology, 1990. / Typescript. Includes bibliographical references (leaves 92-97).
65

Diamond chemical vapor deposition and practical applications

Chen, Yu-Chun, Wilamowski, Bogdan M. Tzeng, Y. January 2009 (has links)
Dissertation (Ph.D.)--Auburn University,2009. / Abstract. Vita. Includes bibliographic references (p.95-104).
66

Experimental investigation of nanofluid oscillating heat pipes

Wilson, Corey A. January 2006 (has links)
Thesis (M.S.) University of Missouri-Columbia, 2006. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 29, 2007) Includes bibliographical references.
67

Surface and electrochemical studies of CVD diamond thin films

Wang, Hao January 2007 (has links)
No description available.
68

A quantum mechanical study of dopants in diamond

Lombardi, Enrico Bruno 11 1900 (has links)
Physics / D.Phil (Physics)
69

"Vinha na fé de trabalhar em diamantes." Escravos e libertos em Lençois, Chapada Diamantina-Ba (1840-1888)

Martins, Romulo de Oliveira 30 September 2013 (has links)
Submitted by Oliveira Santos Dilzaná (dilznana@yahoo.com.br) on 2015-04-29T14:55:04Z No. of bitstreams: 1 Dissertação Romulo de Oliveira Martins.pdf: 3309157 bytes, checksum: fdf1f86a6f28eb572ab98287535ed027 (MD5) / Approved for entry into archive by Ana Portela (anapoli@ufba.br) on 2015-05-05T17:19:27Z (GMT) No. of bitstreams: 1 Dissertação Romulo de Oliveira Martins.pdf: 3309157 bytes, checksum: fdf1f86a6f28eb572ab98287535ed027 (MD5) / Made available in DSpace on 2015-05-05T17:19:27Z (GMT). No. of bitstreams: 1 Dissertação Romulo de Oliveira Martins.pdf: 3309157 bytes, checksum: fdf1f86a6f28eb572ab98287535ed027 (MD5) / CAPES / Em 1844, a descoberta dos diamantes na Chapada Diamantina transformou aquela região, anteriormente pouco povoada, em uma das áreas mais dinâmicas da província da Bahia. A atenção atraída pelas pedras preciosas possibilitou formar um ativo comércio, sustentado por redes de abastecimento que ligou aquela região ao litoral, aos sertões da província da Bahia, às províncias vizinhas, bem como estabeleceu diversas conexões entre a Chapada e outros países. Foi utilizada de forma ampla a mão-de-obra escrava em todos os setores da economia, com destaque para as atividades de mineração. Escravos de diferentes lugares foram direcionados para Lençóis, boa parte dos africanos desembarcados na Bahia nos últimos anos do tráfico negreiro também. Indivíduos que viviam restrições impostas aos egressos do cativeiro na província da Bahia ou mesmo em províncias vizinhas perceberam naquela corrida às minas uma possibilidade de melhor viver. São histórias que permitem observar, entre outros aspectos: a vida cotidiana dos escravos na Chapada; as possibilidades de ascensão; a dinâmica do tráfico transatlântico; o trânsito de cativos entre a escravidão e a liberdade; o estabelecimento de laços afetivos; a difusão de redes de solidariedade; a ampla utilização do braço escravo etc. É por meio desse enredo que essa dissertação propõe analisar as estratégias de sobrevivência, as redes de relações pessoais, familiares, étnicas e as diferentes formas de solidariedade entre escravos e libertos em Lençóis no tempo dos diamantes. In 1844, the discovery of Diamonds in Chapada Diamantina turned that region, previously sparsely populated, in one of the most dynamic areas of the province of the state of Bahia. The attention attracted by precious stones enabled from an active trade, supported by supplies networks that connected the region to the coast to the hinterlands of the province of Bahia, to neighboring provinces, as well as it has established several connections between Chapada Diamantina and other countries. It was used a widely hand-slave labor in all sectors of the economy, specially mining activities. Slaves from different places were targeted to Lençóis, most Africans landed in Bahia in the last years of the slave trade as well. Individuals living restrictions on graduates from captivity in the province of Bahia or even in neighboring provinces realized that race to mine a chance to better living. These are stories that allow us to observe, among other things: the daily lives of slaves in Chapada Diamantina; possibilities of ascent, the dynamics of transatlantic traffic, the transit of prisoners between slavery and freedom; establishing affective ties; diffusion networks solidarity, the extensive use of slave labor etc. Based on this plot, this essay proposes to examine the survival strategies, networks of personal relationships, family, ethnic, and different forms of solidarity among slaves and freedmen in Lençóis during the age of diamonds.
70

Caracterização dos diamantes da província kimberlítica de Juína (MT), e distritos diamantíferos de Espigão D'Oeste (RO), Cacoal (RO) e Diamantina (MG) /

Filemon, Kelusodi Eduardo. January 2005 (has links)
Resumo: O Sistema de Processo de Certificação de Kimberley foi instituído pela Organização das Nações Unidas (ONU) no ano 2000. O Brasil que ocupa a nona posição no ranking dos paises produtores de diamantes, aderiu a esse acordo internacional que tem servido como um mecanismo de certificação de origem geográfica de diamantes brutos destinados à exportação e importação. Considerando-se a extrema importância na determinação da procedência dos diamantes brutos. Foi desenvolvida a presente pesquisa visando caracterizar lotes representativos de diamantes da província kimberlítica de Juína (MT), e dos distritos de Cacoal (RO), Espigão Dþoeste (RO) e Diamantina (MG), utilizando técnicas de fluorescência, espectroscopia infravermelha, fotoluminescência (PL), ressonância paramagnética eletrônica (EPR) e Raman, além de estudos de morfologia, texturas de superfícies e granulometria. Os dados obtidos, através da análise estatística de populações das quatro áreas diamantíferas estudadas mostraram predomínio de diamantes de cor marrom em Juína, e de pedras incolores nos distritos do Cacoal, Espigão Dþoeste e Diamantina. A província de Juína destaca-se pela presença de fragmentos irregulares e raríssimos cristais dodecaedros e octaedros, enquanto nos distritos de Diamantina e de Espigão Dþoeste predominam diamantes com hábito dodecaedro. O comportamento ao infravermelho mostrou, na província kimberlítica de Juína uma proporção elevada de diamantes tipo IIa (15%), diamantes tipo IaB (20%) e diamantes tipo IaAB (65%) apresentando este último, alto estado de agregação do nitrogênio. Os diamantes dos distritos de Cacoal, Espigão Dþoeste e Diamantina enquadram-se na classificação do tipo IaAB, variando seu estado de agregação de nitrogênio. Observados sob luz ultravioleta, os diamantes estudados mostraram diferenças nas cores de fluorescência,... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: In 2000 the United Nations established the Kimberley Process Certification System in order to avoid illegal diamond trading, especially those from the African continent Brazil, which holds the ninth position in the diamonds trading ranking has joined such international agreement that helps as a geographic origin certification mechanism for exporting and importing. Considering the importance in determining the unpolished diamonds origin, the present study have been developed with the aim objective to describe representative diamond amounts or lots from the Kimberlitic Province of Juína (MT), Cacoal (RO) and Espigao Df oeste (RO) and Diamantina (MG) districts. Using spectroscopy techniques, infrared, photoluminescence, electronic paramagnetic resonance and Raman have been used. In addition, other techniques and procedures such as morphology 1 surface roughness and granulometry were applied. Statistical population analysis of four studied diamond bearing areas indicated several particular characteristics. Where some colors highly predominate in a determined region. Brownish colored diamonds are predominant in Juína provence and colorless crystals are present in Cacoal, Espigão Dþoeste and Diamantina districts. The irregular habit is predominant in Juina Provence but rarely dodecahedral and octahedral crystals were found. In Diamantina and Espigao Dþoeste. Diamonds with dodecahedral habits are predominant. In the Juina kimberlitic province the infrared analysis have shown a high amount of type IIa (15%), type Iab (20%) and type IaAB (65%) diamonds, the last type bearing high nitrogen aggregation. Cacoal, Espigão Dfoeste and Diamantina diamonds were classified as IaAB type showing variations in the nitrogen aggregate state. Ultraviolet analysis showed different fluorescence colors for each province caused by variable rare-earth elements concentrations... (Complete abstract, click electronic access below) / Orientador: Sebastião Gomes de Carvalho / Coorientador: Yara Galvão Gobato / Banca: Antenor Zanardo / Banca: Washington Barbosa Leite / Banca: Ihosvany Camps Rodríguez / Banca: Leila Cristina Perdoncini / Doutor

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