Academic literature on the topic 'Tunsten'
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Journal articles on the topic "Tunsten"
Huang, Hui, Ren Chun Fu, and Zhong Cheng Guo. "Thermal Degradation Behavior of Polyaniline in Polyaniline/Tunsten Carbide Composite." Advanced Materials Research 581-582 (October 2012): 719–22. http://dx.doi.org/10.4028/www.scientific.net/amr.581-582.719.
Full textAgustriyana, Lisa. "KARAKTERISASI HASIL PENGELASAN GTAW PADA BAJA KARBON RENDAH DENGAN VARIASI SUDUT GEOMETRI ELEKTRODE DAN BESAR ARUS PENGELASAN." INFO-TEKNIK 19, no. 1 (July 25, 2018): 101. http://dx.doi.org/10.20527/infotek.v19i1.5145.
Full textRadhakrishnan, K., and V. Muralidharan. "Optimization of Weld Parameters and Weld Bead Dimensions in Welding of 0.3%C-Cr-Mo-V Steel by Gas Tungsten Arc Welding Process." Applied Mechanics and Materials 852 (September 2016): 178–84. http://dx.doi.org/10.4028/www.scientific.net/amm.852.178.
Full textMaldonado-Hódar, F. J., A. F. Pérez-Cadenas, and C. Moreno-Castilla. "Morphology of heat-treated tunsgten doped monolithic carbon aerogels." Carbon 41, no. 6 (2003): 1291–99. http://dx.doi.org/10.1016/s0008-6223(03)00069-1.
Full textEl-Hawary, M. E. "Tunstel Defining Robotic Technology Development at APL [SMC Innovators]." IEEE Systems, Man, and Cybernetics Magazine 1, no. 3 (July 2015): 63–67. http://dx.doi.org/10.1109/msmc.2015.2483066.
Full textD'Alton, Craig W. "Cuthbert Tunstal and Heresy in Essex and London, 1528." Albion: A Quarterly Journal Concerned with British Studies 35, no. 2 (2003): 210. http://dx.doi.org/10.2307/4054135.
Full textD’Alton, Craig W. "Cuthbert Tunstal and Heresy in Essex and London, 1528." Albion 35, no. 2 (2003): 210–28. http://dx.doi.org/10.1017/s0095139000069829.
Full textMcDonough, William. "Two Authors and Their Two Books Writ Twice: James Tunstead Burtchaell and Rosemary Haughton, Twenty-Five and Thirty Years on." Horizons 27, no. 1 (2000): 149–63. http://dx.doi.org/10.1017/s0360966900020892.
Full textKlibi, Mohamed Faker. "Le Systeme Comptable Des Entreprises Tunsien Apres 15 Ans D’application : Présentation , Tentative D’évaluation Et Perspectives Futures." مجلة الباحث, no. 10 (2012): 1–10. http://dx.doi.org/10.12816/0005847.
Full textPalacios, T., M. V. Aguirre, and J. Y. Pastor. "Influence of the fabrication route of tunsgen-2 wt.% vanadium in the microstructure and mechanical properties." Fusion Engineering and Design 132 (July 2018): 60–66. http://dx.doi.org/10.1016/j.fusengdes.2018.05.030.
Full textDissertations / Theses on the topic "Tunsten"
Cross, Warren Bradley. "Chemical vapour deposition of tunsten oxide thin films from single-source precursors." Thesis, University College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406141.
Full textHanif, Ahmad. "Partial oxidation and COâ†2 reforming of methane to valuable products over molybdenum and tunsten carbide." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343512.
Full textJagenheim, Ann. "Ett studium av olika aspekter av tid i Göran Tunströms roman Juloratoriet." Thesis, Växjö University, School of Humanities, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-579.
Full textCosta, Francine Bettio [UNESP]. "Investigação espectroscópica e estudo do mecanismo de conversão descendente de energia em vidros TeO2-WO3 co-dopados com íons Nd3+ E Yb3+." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/139559.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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A busca por novas fontes renováveis de energia tem se tornado de grande apelo devido à necessidade de se reduzir os impactos ambientais. Esse interesse tem motivado a pesquisa e o desenvolvimento de células fotovoltaicas (CFs) mais eficientes e baratas. Assim, a energia solar fotovoltaica tem sido uma opção para se complementar e ampliar a geração de eletricidade. Entretanto, as células de silício cristalino (Si-c) disponíveis no mercado apresentam baixa eficiência de conversão da radiação luminosa em energia elétrica devida, principalmente, às perdas por incompatibilidade espectral entre as regiões de máxima emissão solar (região do visível - Vis) e de máxima eficiência fotovoltaica da célula de Si-c (região do infravermelho - IV). Para minimizar essas perdas e, consequentemente, melhorar a eficiência da CF, conversores descendentes de energia compostos por íons terras-raras são usados na conversão de fótons de alta energia (Vis) em fótons de menor energia (IV). Nesse ínterim, no presente trabalho foram estudadas as propriedades espectroscópicas dos íons neodímio (Nd3+) e itérbio (Yb3+) incorporados, como dopantes, no vidro telurito-tungstênio (TW). Tais propriedades foram obtidas a partir de medidas de difração de raios-X, densidade de massa, espectroscopia de infravermelho por transformada de Fourier, Raman, absorção óptica, luminescência, excitação, evolução temporal da luminescência e lente térmica. Este estudo foi dividido em duas etapas. Primeiramente, vidros TW dopados com Nd3+ foram preparados em diferentes atmosferas, i.e., uma atmosfera ambiente e outra rica em O2, para investigação da influência dos grupos hidroxilas (OH) nas propriedades espectroscópicas de amostras com diferentes concentrações de Nd3+. A dependência com a concentração indicou que a transferência de energia do íon Nd3+ para o grupo OH foi desprezível e que a eficiência quântica luminescente do nível 4F3/2 diminuiu com o aumento da concentração de Nd3+. Posteriormente, vidros TW co-dopados com Nd3+ e Yb3+ foram preparados em atmosfera ambiente para investigação da correlação entre os íons Yb3+ e os mecanismos de conversão descendente de energia (CDE). Os resultados mostraram que a luminescência, oriunda do nível 4F3/2, diminuiu com o aumento da concentração de íons Yb3+. Simultaneamente, observou-se um aumento correspondente na emissão do Yb3+ e uma redução no calor gerado pela amostra. A transferência de energia Nd3+ → Yb3+ foi observada qualitativamente e a eficiência dessa transferência foi avaliada quantitativamente por valores do tempo de vida. Esses resultados indicam que o vidro TW co-dopado com íons Nd3+ e Yb3+ é um sistema com potencial para ser usado como material conversor descendente de energia aplicado sobre as células fotovoltaicas de Si-c.
The demand for new and renewable energy sources has been of great appeal due to the reduction of environmental impacts. This interest has motivated the research and the development of more efficient and less expensive photovoltaic (PV) cells. Thus, the photovoltaic solar energy has been an option to complement and expand the generation of electricity. However, commercialized crystalline silicon cells present low conversion efficiency of the light irradiation energy into electric energy, mainly due to the spectral mismatch between the regions of maximum solar emission (visible spectrum) and of maximum PV cell efficiency, which is in infrared region. To minimize such losses and, consequently, improve the efficiency of PV cell, down-converters with rare-earth ions in their structure are used to convert the high energy photons (at the visible - Vis) into low energy photons (at the infrared - IR). Meanwhile, in the present work we study the spectroscopic properties of neodymium (Nd3+) and ytterbium (Yb3+) ions incorporated as dopants in a tellurite-tungsten (TW) glass matrix. The characterization of the samples were obtained from measurements of X-ray diffraction, mass density, Fourier transform infrared spectroscopy, Raman spectroscopy, optical absorption, luminescence, excitation, temporal evolution of the luminescence and thermal lens. This study was divided into two stages. Primarily, Nd3+-doped TW glasses were prepared in different atmospheres, i.e., an ambient atmosphere and in another rich in O2 to investigate the influence of the hydroxyl (OH) groups in the spectroscopic properties of samples with different concentrations of Nd3+. The results showed that the energy transfer from Nd3+ ion to the OH group was negligible. The concentration dependency indicated that the energy transference from the Nd3+ ion to the OH group was negligible. In addition, the luminescent quantum efficiency of 4F3/2 level decreased with increasing of Nd3+ concentration. Subsequently, Nd3+ and Yb3+ co-doped TW glasses were prepared in ambient atmosphere to investigate the correlation between Yb3+ ions and down-conversion (DC) mechanisms. The results showed that the luminescence of the 4F3/2 decreased as the concentration of Yb3+ was increased. Simultaneously, it was observed a corresponding increase in the emission of the Yb3+ and a reduction in the generated heat by the sample. The Nd3+ → Yb3+ energy transfer was observed qualitatively and the efficiency of such transfer was quantitatively evaluated by lifetime values. The results indicate that the co-doped TW glasses by Nd3+ and Yb3+ are systems with potential to be used as down-converter material applied to the c-Si photovoltaics cells.
Costa, Francine Bettio. "Investigação espectroscópica e estudo do mecanismo de conversão descendente de energia em vidros TeO2-WO3 co-dopados com íons Nd3+ E Yb3+ /." Ilha Solteira, 2016. http://hdl.handle.net/11449/139559.
Full textAbstract: The demand for new and renewable energy sources has been of great appeal due to the reduction of environmental impacts. This interest has motivated the research and the development of more efficient and less expensive photovoltaic (PV) cells. Thus, the photovoltaic solar energy has been an option to complement and expand the generation of electricity. However, commercialized crystalline silicon cells present low conversion efficiency of the light irradiation energy into electric energy, mainly due to the spectral mismatch between the regions of maximum solar emission (visible spectrum) and of maximum PV cell efficiency, which is in infrared region. To minimize such losses and, consequently, improve the efficiency of PV cell, down-converters with rare-earth ions in their structure are used to convert the high energy photons (at the visible - Vis) into low energy photons (at the infrared - IR). Meanwhile, in the present work we study the spectroscopic properties of neodymium (Nd3+) and ytterbium (Yb3+) ions incorporated as dopants in a tellurite-tungsten (TW) glass matrix. The characterization of the samples were obtained from measurements of X-ray diffraction, mass density, Fourier transform infrared spectroscopy, Raman spectroscopy, optical absorption, luminescence, excitation, temporal evolution of the luminescence and thermal lens. This study was divided into two stages. Primarily, Nd3+-doped TW glasses were prepared in different atmospheres, i.e., an ambient atmosphere and... (Complete abstract click electronic access below)
Resumo: A busca por novas fontes renováveis de energia tem se tornado de grande apelo devido à necessidade de se reduzir os impactos ambientais. Esse interesse tem motivado a pesquisa e o desenvolvimento de células fotovoltaicas (CFs) mais eficientes e baratas. Assim, a energia solar fotovoltaica tem sido uma opção para se complementar e ampliar a geração de eletricidade. Entretanto, as células de silício cristalino (Si-c) disponíveis no mercado apresentam baixa eficiência de conversão da radiação luminosa em energia elétrica devida, principalmente, às perdas por incompatibilidade espectral entre as regiões de máxima emissão solar (região do visível - Vis) e de máxima eficiência fotovoltaica da célula de Si-c (região do infravermelho - IV). Para minimizar essas perdas e, consequentemente, melhorar a eficiência da CF, conversores descendentes de energia compostos por íons terras-raras são usados na conversão de fótons de alta energia (Vis) em fótons de menor energia (IV). Nesse ínterim, no presente trabalho foram estudadas as propriedades espectroscópicas dos íons neodímio (Nd3+) e itérbio (Yb3+) incorporados, como dopantes, no vidro telurito-tungstênio (TW). Tais propriedades foram obtidas a partir de medidas de difração de raios-X, densidade de massa, espectroscopia de infravermelho por transformada de Fourier, Raman, absorção óptica, luminescência, excitação, evolução temporal da luminescência e lente térmica. Este estudo foi dividido em duas etapas. Primeiramente, vidros TW dopado... (Resumo completo, clicar acesso eletrônico abaixo)
Doutor
Krneta, S. "Mineral paragenesis and alteration of the Mt. Carbine tungsten deposit far north Queensland: the late stage evolution of an S-type granite." Thesis, 2011. http://hdl.handle.net/2440/96680.
Full textThe Mt. Carbine tungsten deposit represents a good example of granite related sheeted vein mineralization recording the late stages of granite cooling volatile differentiation and subsequent expulsion. The presence of 3 distinct mineralizing stages has been recognized through the study of the alteration and mineral paragenesis. These observations coupled with geochemical analysis have culminated in unraveling some of the physiochemical conditions under which the deposit formed and their dynamic evolution through time. Along with gaining important insights into the formation of the deposit analyses were conducted on individual minerals from different parts of the deposit as an investigation into their possible use as geochemical vectors to mineralization through trends in trace and REE chemistry. The findings of the study indicate that the deposit formed as a result of fluid expulsions from a single magmatic event forming a distinctive high to low temperature and reduced to oxidized fluid evolution. The study also found the presence of 2 distinct alteration assemblages which although containing some lithologically induced heterogeneities appear as a alkaline distal and potassic proximal alteration. The use of mineral geochemistry as an exploration tool in many of the tested cases has proven to either be of little potential use whereas others have not been tested adequately. Wolframite Fe/Mn ratios have proven as being potentially useful as a means of delineating vertical displacement from the source of the mineralizing fluids due to the telescoped nature of the vein fill minerals.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Earth and Environmental Sciences, 2011
General, Michael. "Microstructural and Mechanical Property Changes in Ion Irradiated Tunsgten." Thesis, 2013. http://hdl.handle.net/1969.1/149365.
Full textAmaro, Filipe Miguel Martins Miguens. "Avaliação do comportamento em serviço de ferramentas de corte WC-Co em função das condições de jateamento." Master's thesis, 2017. http://hdl.handle.net/10316/83398.
Full textEste estudo enquadra-se no âmbito da inovação e melhoria contínua de uma área empresarial muito concreta, a indústria das ferramentas de corte. O foco central é o desenvolvimento e percepção da relação entre o estado de tensões introduzido numa ferramenta de corte e a melhoria ou não das suas propriedades mecânicas e tribológicas com o mesmo. As pastilhas de corte estudadas são constituidas por carboneto de tungsténio com cobalto, ou seja, trata-se de um material cerâmico com uma percentagem ainda significativa de ligante metálico. Esta particulariedade leva a que não seja completamente linear a máxima de que a presença de tensões residuais de compressão controla e reduz a propagação de fendas por fadiga, uma vez que as falhas podem ocorrer pelo colapso de micro fissuras na superfície. Neste estudo o processo de eleição adoptado para a introdução de tensões na superfície da pastilha de corte, dentro da gama de tratamentos superficiais, foi o jateamento em meio húmido. Foram ensaiadas várias condições distintas de jateamento numa pastilha de corte com geometria simples. Estes corpos de prova foram avaliados por diversas técnicas de caracterização, sendo as mais relevantes a determinação da dureza por ensaios de identação e a determinação das tensões residuais por difração de Raios X. Os resultados do desempenho da pastilha de corte quando aplicada em torneamento e da adesão do revestimento da pastilha de corte previamente sujeita a jateamento são bastante animadores e comprovam os benefícios subjacentes à presença de tensões residuais de compressão numa ferramente de corte.
This study fits within the scope of innovation and continuous improvement of a very concrete business area, the cutting tools industry. The central focus is the development and perception of the relationship between the state of stress introduced in a cutting tool and the improvement or not of its mechanical and tribological properties therewith.The studied cutting pellets consist of tungsten carbide with cobalt, that is, it is a ceramic material with a still significant percentage of metal binder. This particularity leads to the fact that the presence of compressive residual stresses is not completely linear and reduces the propagation of cracks through fatigue, since the faults can occur due to the collapse of micro cracks in the surface.In this study the chosen process for the introduction of stresses on the surface of the cutting insert within the range of surface treatments was wet blasting. Several different blasting conditions were tested on a single geometry cutting insert.These specimens were evaluated by several characterization techniques, the most relevant being the determination of hardness by indentation tests and determination of residual stresses by X-ray diffraction.The results of the performance of the cutting insert when applied in turning and the adhesion of the sheeting of the cutting insert previously subjected to blasting are quite encouraging and prove the benefits underlying the presence of residual compression stresses in a cutting tool. In the future the purpose is the extrapolation of the results obtained to a more common and comercial available geometry.
Books on the topic "Tunsten"
Wang, Chang'an. Tunshan zhu pu. Xianggang: Da ye gong si, 1988.
Find full textThe World Market for Unwrought Tungsten (Wolfram) and Tunsten Waste and Scrap: A 2004 Global Trade Perspective. Icon Group International, Inc., 2005.
Find full textParker, Philip M. The World Market for Unwrought Tungsten (Wolfram) and Tunsten Waste and Scrap: A 2007 Global Trade Perspective. ICON Group International, Inc., 2006.
Find full textStaff, Melange Books LLC. Tunsey Men: Giselle. Melange Books, LLC, 2011.
Find full textStaff, Melange Books LLC. Tunsey Men: Victoria. Melange Books, LLC, 2011.
Find full textStaff, Melange Books LLC. Giselle: Tunsey Men. Melange Books, LLC, 2011.
Find full textStaff, Melange Books LLC. Tunsey Men: Lisette. Melange Books, LLC, 2011.
Find full textStaff, Melange Books LLC. Victoria: Tunsey Men 2. Melange Books, LLC, 2011.
Find full textStone, Wendy. Lisette: Tunsey Men, Book 1. Melange Books, LLC, 2011.
Find full textStone, Wendy Stone Wendy. MSF Presents - the Tunsey Men 1, Lisette. Lulu Press, Inc., 2010.
Find full textBook chapters on the topic "Tunsten"
"Hume and the Conformity of Bishop Tunstal." In Death and Character, 81–99. Harvard University Press, 2008. http://dx.doi.org/10.2307/j.ctv1ns7nr0.9.
Full text"5 Hume and the Conformity of Bishop Tunstal." In Death and Character, 81–99. Harvard University Press, 2008. http://dx.doi.org/10.4159/9780674268913-007.
Full textConference papers on the topic "Tunsten"
Huang, Yi-Hsuan, Chung-Jung Hung, and Tseung-Yuen Tseng. "Electrochromic properties of tunsgten trioxide nanostructures." In 2013 IEEE 63rd Electronic Components and Technology Conference (ECTC). IEEE, 2013. http://dx.doi.org/10.1109/ectc.2013.6575799.
Full text"Prevention of tumor growth by photo- and X-ray activation of tunsgen cluster complex and its conjugate with DNA molecules." In Bioinformatics of Genome Regulation and Structure/ Systems Biology. institute of cytology and genetics siberian branch of the russian academy of science, Novosibirsk State University, 2020. http://dx.doi.org/10.18699/bgrs/sb-2020-319.
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