Thèses sur le sujet « Metalli non ferrosi »
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Scarpelli, Andrea. « Valutazione d'impatto ambientale : impianto di stoccaggio e trattamento rifiuti speciali non pericolosi, prevalentemente di natura ferrosa e non ferrosa ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amslaurea.unibo.it/983/.
Texte intégralSouza, Fabrício Mendes. « Estudo da microestrutura, da textura cristalográfica e da recristalização em chapas obtidas por lingotamento contínuo e semicontínuo da liga de alumínio AA4006 ». Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-07052012-121639/.
Texte intégralAA4006 Aluminum alloy is extensively used in industry. It belongs to the Al-Fe-Si system, with Si between 0,8 and 1,2 % mass, and Fe between 0,5 and 0,8 % mass. This alloy is less studied despite its extensive use. A comparative microstructural study has been performed in as-received AA4006 alloy strip produced by two industrial casting processes: twin roll caster (TRC) and direct chill (DC). Polarized optical microscopy, scanning electron microscopy with microanalysis, electrical conductivity measurements and Brinnel hardness tests have been used for microstructural characterization. Significant differences in the grain and intermetallic particle sizes, morphologies and distributions were detected and are discussed. Thermal treatments effects on the silicon content in solid solution were also studied. Crystallographic textures have been also determined. Textures across thickness of both sheets have been analyzed and compared. Results showed significant texture changes across thickness of the specimens. Texture analysis was carried out using X-ray diffraction technique. Twin roll caster (TRC) sheet presented the typical shear texture near the surface, while, in internal regions, the -fibre was observed. A recrystallization study of cold rolled metallic sheets is very important to obtain softening temperature for the material during annealing. After cold rolling with 70% of reduction in thickness, followed by isochronous heat treatments, the samples of the two sheets produced by TRC and DC presented a 50% recrystallization temperature around 290 ºC and 270 ºC, respectively. Crystallographic texture can change during the metal rolling and recrystallization. These processing steps can optimize the grain orientation distribution in a metal strip to improve, for instance, the stamping process, in order to obtain an aggregated value product. Softening curves were also compared and determined for the two sheets (rolled and annealed) of the AA4006 aluminum alloy produced by twin roll caster TRC and direct chill DC processes. It was detected that the recrystallization of the strip produced by TRC process occurs at a higher temperature than that for the DC process, despite the little differences in their softening curves. Crystallographic texture results, for the sheet samples, were obtained by using X-ray diffraction and electron back scatter diffraction EBSD techniques. These results indicated the shear texture presence on the surface and fiber at the center of the cold rolled (70% area reduction) sample for the sheet produced by TRC process. In the sheet sample produced by the DC process, under the same conditions, the cube component and fiber texture (at the surface and at the center) were observed. A texture with random oriented grains was detected in two deformed and recrystallized samples of the two sheets (TRC and DC). It is suggested that this texture occurs due to the particle stimulated nucleation. There was fiber absence in the recrystallized samples (TRC and DC).
Puff, Rinaldo. « Estudo de fadiga para materiais ferrosos com vazios e inclusões não metálicas ». Universidade do Estado de Santa Catarina, 2015. http://tede.udesc.br/handle/handle/621.
Texte intégralCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
This thesis was motivated by the study of voids and non-metallic inclusions influence on the high cycle fatigue of ferrous materials like steel, powder metal and gray cast iron. A second objective was to obtain simpler parameters, like the ones measured in hardness, static bending or axial tests, to evaluate materials in early phases of projects, in a way to avoid long fatigue tests. Initially the average fatigue strength was obtained for a high carbon steel. The effect of a silicon oxide inclusion near the surface on the performance of heavy-duty Cr-Si spring wire was also analyzed. The evaluation was done in terms of stress concentrating on the inclusion contours, due to the shot peening application on the surface and normal fluctuating loads. Mechanical properties of powder metal and cast iron were revised. Static tests without and with the presence of notches were performed, with the objective of obtaining a static notch sensitivity factor, to correlate with torsion fatigue results. The relation between hardness and torsion fatigue strength was evaluated for the cast iron, and simulations using linear elastic and nonlinear materials were performed to obtain geometric stress concentrating factors. A mesoscale simulation was done in plane stress, making it possible to evaluate local stress concentration in the cast iron matrix.
Esta tese foi motivada pelo estudo da influência de vazios e inclusões não metálicas na fadiga de alto ciclo de materiais ferrosos como aços, materiais obtidos por metalurgia do pó e ferros fundidos cinzentos. Foi objetivo também, avaliar parâmetros de medição mais simples, como os obtidos de ensaios de dureza e de flexão ou tração estáticos, como forma de avaliar materiais em fases iniciais de projeto, evitando-se longos ensaios de fadiga. Inicialmente obteve-se a resistência à fadiga de alto ciclo de um aço de alto teor de carbono. Analisou-se também o efeito da presença de uma inclusão de óxido de silício próximo à superfície de um arame de aço Cr-Si utilizado em molas submetidas a cargas reversas. A análise foi feita em termos de concentração de tensão nos contornos da inclusão, devido à aplicação de shot peening na superfície e também devido às cargas de operação. Uma revisão de propriedades mecânicas de aços obtidos por metalurgia do pó e do ferro fundido foi realizada, assim como ensaios estáticos sem e com entalhe, no intuito de obter um fator de sensibilidade ao entalhe estático, como forma de correlacionar com a sensibilidade ao entalhe na fadiga em torção. Foi avaliada a relação entre a dureza do ferro fundido e a sua resistência à fadiga na torção e realizadas simulações com material linear elástico e não linear para obter um fator de concentração de tensão geométrico. Uma simulação em mesoescala em estado plano de tensão foi realizada, podendo-se determinar a concentração de tensões locais na matriz do ferro fundido.
Bulut, Burcak. « Forecasting The Prices Of Non-ferrous Metals With Garch Models & ». Thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612393/index.pdf.
Texte intégralDecember 15, 2008 is used for the data analysis part of the thesis.
Gustafsson, Ny Björn. « Casting Identities in Central Seclusion : Aspects of non-ferrous metalworking and society on Gotland in the Early Medieval Period ». Doctoral thesis, Stockholms universitet, Institutionen för arkeologi och antikens kultur, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-95380.
Texte intégralAt the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 5: Manuscript.
Абрамович, А. О. « Нормування сигналу металоаналізатора для застосування методу лінійного передбачення ». Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/65263.
Texte intégralPack, Alison Greer. « Some People Call Them Dolls : Capturing the Iconic Power of the Female Form in Non-ferrous Metals ». [Johnson City, Tenn. : East Tennessee State University], 2003. http://etd-submit.etsu.edu/etd/theses/available/etd-0330103-135724/unrestricted/PackA040803d.pdf.
Texte intégralTitle from electronic submission form. ETSU ETD database URN: etd-0330103-135724. Includes bibliographical references. Also available via Internet at the UMI web site.
Pilarčík, Edmund. « Studium kvality řezu hliníkových a Cu slitin při tavném řezání v závislosti na procesních parametrech při laserovém dělení s využitím YbYAG vláknového laseru ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241860.
Texte intégralRemešová, Michaela. « Technologie galvanické anodizace neželezných kovů a slitin ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231773.
Texte intégralЛай, Х., et H. Lai. « Развитие росийско-китайской торговли цветными металлами : магистерская диссертация ». Master's thesis, б. и, 2021. http://hdl.handle.net/10995/100717.
Texte intégralThe WRC (master's thesis) consists of an introduction, three chapters, a conclusion, a bibliographic list, including 62 titles. The work includes 10 tables and 13 figures. The total volume of the FQP (master's thesis) is 85 pages. Key words: non-ferrous metals trade, international relations, trade development. The purpose of the master's thesis is to research, assess and analyze the state of the Russian-Chinese trade in non-ferrous metals, to identify problems and development prospects. study of the current state of the Russian-Chinese trade in non-ferrous metals and develop guidelines for its development. Scientific and practical results: assessed the current state and dynamics of the development of Russian-Chinese foreign trade relations; revealed the specific features of foreign trade relations; potential directions of further development of the Russian-Chinese trade in non-ferrous metals have been proposed. The measures proposed in the work to solve the problems existing in the Russian-Chinese trade in non-ferrous metals will make it possible to move to a new stage of development. Further development of bilateral relations between China and Russia has broad prospects for long-term and close mutually beneficial cooperation.
Brault-Vattier, Thierry Pierre Antoine. « L'aluminium au XXe et XXIe siècles. Étude d’économie industrielle ». Thesis, Pau, 2015. http://www.theses.fr/2015PAUU2003/document.
Texte intégralAt different times and speeds, depending on the countries concerned, aluminium has transformed both the world of industry and our ways of life. In the early 20th century, the developing world was already divided between North America, where steel and concrete were beginning to shape cities linked by railroads, and Europe, where it was necessary to demolish before rebuilding, and the transformation therefore took longer. Aluminium and hydroelectricity emerged together, heralding a long period of growth that was accelerated by their complementarity. Technical progress in both domains had a snowball effect. The expansion lasted three-quarters of a century, until the rising household demand for electricity forced aluminium producers to look for new sources of energy, firstly in the United States. The developing countries followed the same path and provided continuity. China has been the leading aluminium producer in the world since 2003. Modernisation affected both domains at the same time, creating considerable needs for support. Economics and management sciences have developed theoretical and practical foundations in a network, amplifying the effectiveness of technical advances. The interest of this study lies in our revelation of the lasting interactions between economic theory and industrial production
Пяткова, В. И., et V. I. Pyatkova. « Ресурсное обеспечение малых промышленных предприятий ломом цветных металлов : магистерская диссертация ». Master's thesis, б. и, 2021. http://hdl.handle.net/10995/97928.
Texte intégralModern conditions of economic activity, its dynamics make the rationalization of the processes of material and technical support one of the main competitive advantages of economic entities. This provision is especially relevant for material-intensive small enterprises engaged in non-ferrous metallurgy. The aim of the master's thesis is to develop a methodology for providing small industrial enterprises with non-ferrous scrap. The paper analyzes the main production features of small industrial enterprises in the context of the stages of resource provision of enterprises, gives a recommendation for optimizing the resource provision of a small industrial enterprise with non-ferrous scrap. The special importance of the secondary metals market as a potential source of resource saving for material-intensive small industrial enterprises is noted. Educational-methodical and research literature, the results of the author's research were used as sources. In the master's thesis, a methodology was developed for providing small industrial enterprises with non-ferrous scrap, which is based on taking into account the specifics of economic activity, production capabilities, assessing suppliers and the time factor, which allows reducing the cost of basic materials, as well as focusing on possible points of development of vertical (reverse) integration, thereby moving to a qualitatively new basis of resource provision.
Flament, Julien. « Les métallurgies associées de la fin du XIIIe siècle au XVe siècle : L’argent, les cuivres et le plomb à Castel-Minier (Ariège, France) ». Electronic Thesis or Diss., Orléans, 2017. http://www.theses.fr/2017ORLE1175.
Texte intégralFor several decades, the central Pyrenees have been the subject of multidisciplinary researches, which deal with medieval mining and metallurgical activities. In the ancient viscounty of Couserans, archaeological excavations unearthed the site of Castel-Minier, which played a major role in mining and metals production between the late 13th and 15th centuries. The artefacts uncovered have highlighted the polymetallic activities of the workshop, which is characterized by the practice of several metallurgies concerning silver, copper and its alloys and lead. Our work aims, on the one hand, to identify the nature and origin of the mineral resources that supply the site and, on the other hand, to understand the functional organisation of the different workspaces through the restitution of the chaînes opératoires.Our research is carried out in a multidisciplinary perspective, combining the study of textual and iconographic sources, the results of archaeological excavations and data from the archaeometric studies of the metallurgical artefacts. The results show, besides the transformation of argentiferous galena to extract silver, the production of desilvered lead, unalloyed copper and antimony-lead bronze, or caldarium. Each chaîne opératoire is subject to a detailed study in which technical practices are discussed, as well as the forms and qualities of production. The association of several metallurgical activities in Castel-Minier workshops is an opportunity to address the issue of workers' multi-skilling and expertise, and also to discuss their adaptability according to the mining opportunities and the expectations of the metals market
Olsson, Tobias. « Studie av en medeltida husgrund : en analys av bronsfynd från husgrund 6, Västergarn, Gotland ». Thesis, Högskolan på Gotland, Institutionen för kultur, energi och miljö, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hgo:diva-1483.
Texte intégralBERTILORENZI, MARCO. « Il controllo della sovrapproduzione. I cartelli internazionali nell’industria dell’alluminio in prospettiva storica, 1886-1945 ». Doctoral thesis, 2010. http://hdl.handle.net/2158/592644.
Texte intégralWang, Shuo-Hong, et 王碩宏. « Exploration of non-ferrous bulk metallic glasses with low glass transition temperature ». Thesis, 2012. http://ndltd.ncl.edu.tw/handle/41211905672047617133.
Texte intégralLiebenberg, Andre Sarel. « An evaluation of the impact of the Non-ferrous Metals Crime Combating Committee on copper cable theft ». Thesis, 2020. http://hdl.handle.net/10500/27467.
Texte intégralThis study aims to evaluate the Non-Ferrous Metals Crime Combating Committee's impact on combating copper cable theft in South Africa. Data was collected via in-depth interviews with awaiting trial detainees charged with copper cable theft at the Pollsmoor Correctional Centre in the Western Cape; members of the Mpumalanga and Gauteng Provincial Non-Ferrous Metals Crime Combating Committee; members of Business Against Crime South Africa; and investigators attached to Combined Private Investigations who investigate copper theft nationally. The in-depth interviews provided a comprehensive understanding of participant experiences relating to the impact of the Non-Ferrous Metals Crime Combating Committee on the combating of copper cable theft in South Africa. Moreover, the researcher performed a thorough literature study of the phenomenon locally and internationally. Research findings indicate shortcomings in the Non-Ferrous Metals Crime Combating Committee's effectiveness, limiting its impact on preventing copper cable theft. Based on these findings, the study recommends that the Non-Ferrous Metals Crime Combating Committee be replaced with a specialised South African Police Service Non-Ferrous Metals Theft Unit. Consequently, this study puts forward a set of recommendations proposing a systematic pro-active plan to address and minimise copper cable theft in South Africa. The proposed plan convincingly presents practical solutions to minimise copper cable theft and contributes to the current body of scholarship on copper cable theft in South Africa.
Inhloso yalolu cwaningo ukuhlola umthelela wohlelo lwe-Non-Ferrous Metals Crime Combating Committee mayelana nokuqedwa kokutshontshwa kwentambo yogesi (copper cable). Idatha iqoqwe ngokusebenzisa izinhlolovo ezijulile ezenziwa ngokusebenzisa iziboshwa eziboshelwe izintambo zikagesi ezisamele ukugwetshwa ejele lase Pollsmoor Correctional Centre ngaseNtshonalanga Kapa, amalunga eMpumalanga and Gauteng Provincial Non-Ferrous Metals Crime Combating Committee, amalunga eBusiness Against Crime South Africa kanye nabaphenyi abahambisana nophiko lweCombined Private Investigations oluphenya ukutshontshwa kwezintambo zikagesi ezweni lonke. Lezi zinhlolovo ezijulile zinikeze ulwazi olubanzi lwabadlalindima olumayelana nomthelela weNon-Ferrous Metals Crime Combating Committee mayelana nokuqedwa kokutshontshwa kwezintambo zikagesi. Ngaphezu kwalokho, umcwaningi wenze ucwaningo olunzulu lombhalo wobuciko mayelana nokutshontshwa kwezintambo zikagesi lapha ekhaya kanye nasemhlabeni wonke jikelele. Ulwazi olutholakele lukhombisa iziqi ezikhinyabeza ukusebenza kahle kweKomithi mayelana nokuvimbela umthelela walo mayelana nokutshontshwa kwezintambo zikagesi. Ngezizathu ezisuselwa phezu kwalolu lwazi, lolu cwaningo lubeka phambili isethi lezincomo ezinganceda iKomiti ekuqiniseni umthintela walo ngokuhlongoza uhlelo olugqugquzelayo lokunciphisa izinga lokutshontshwa kwezintambo zikagesi eNingizimu Afrika. Lolu hlelo oluhlongoziwe ngaphandle kokungabaza lwethula izixazululo ezenzeka empilweni yangempela ukunciphisa ukwetshiwa kwezintambo zikagesi kanti lokhu kunegalelo kwiziko lamanje futhi luqhubekisa iziko lamanje lwezifundo esimayelana nokwetshiwa kwezintambo zikagesi.
Maikemisetso a thutelo ye ke go lekola khuetso ya Komiti ya Twantsho ya Bosenyi bja Dimetale tse di Sego tsa Tshipi ka ga go lwantsha kutso ya megala ya koporo. Datha e kgobokeditswe ka mokgwa wa ditherisano tse di tseneletsego tseo di sepeditswego le mahodu a megala ya koporo ao a golegilwego ao a letetsego go sekiswa Senthareng ya Tshokollo ya Pollsmoor go la Kapa Bodikela, maloko a Diprofense tsa Mpumalanga le Gauteng a Komiti ya Twantsho ya Bosenyi bja Dimetale tse di sego tsa Tshipi, maloko a Dikgwebo tsa Kgahlanong le Bosenyi tsa Afrika Borwa le banyakisisi bao ba dirisanago le Dinyakisiso tsa Praebete tse Kopantswego tseo di nyakisisago kutso ya koporo kemong ya bosetshaba. Ditherisano tse di tseneletsego tse di file kwesiso ka botlalo ya maitemogelo a batseakarolo ye e sepelelanago le khuetso ya Komiti ya Twantsho ya Bosenyi bja Dimetale tse di sego tsa Tshipi ka ga go lwantsha kutso ya megala ya koporo. Gape, monyakisisi o dirile thutelo ya dingwalo ka botebo ya kutso ya megala ya koporo tikologong ya leagong le kemong ya boditshabatshaba. Dikhwetso tsa dinyakisiso di supa mafokodi ao a lebanego bokgoni bja Komiti tshitisong ya khuetso ya yona go kutso ya megala ya koporo. Go ya ka dikhwetso tse, thutelo ye e hlagisa sehlopha sa dikeletso tseo di ka thusago Komiti go tswetsa khuetso ya yona pele ka go sisinya leano la go itokisetsa seemo se ka diregago ka mokgwa wo o beakantswego go fokotsa kutso ya megala ya koporo ka Afrika Borwa. Leano leo le sisintswego le hlagisa ka mo go kgodisago ditharollo tse di ka phethagatswago go fokotsa kutso ya megala ya koporo ka gona la ba la seabe go le go tswetsa pele popego ya bjale ya borutegi ka ga kutso ya megala ya koporo.
Criminology and Security Science
Ph. D. (Criminal Justice)
Coetzee, Ben. « A case study of non-ferrous metal theft at a selected mine in South Africa ». Diss., 2013. http://hdl.handle.net/10500/13332.
Texte intégralPolice Practice
M.A. (Policing)
Kšinská, Anna. « Příběhy soch a pomníků : ztráta národního dědictví Francie během 2. světové války ». Master's thesis, 2020. http://www.nusl.cz/ntk/nusl-435436.
Texte intégralFemi, Olu Emmanuel. « Microstructure Design And Interfacial Effects On Thermoelectric Properties Of Bi-Sb-Te System ». Thesis, 2015. http://etd.iisc.ernet.in/handle/2005/2655.
Texte intégralPretorius, William Lyon. « A criminological analysis of copper cable theft in Gauteng ». Diss., 2012. http://hdl.handle.net/10500/10598.
Texte intégralCriminology
M.A. (Criminology)
Liebenberg, Andre Sarel. « Examining the significance of modus operandi information in copper theft investigation ». Diss., 2018. http://hdl.handle.net/10500/26428.
Texte intégralCriminology and Security Science
M. Tech. (Forensic Investigation)