Academic literature on the topic 'Silver brazing'
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Journal articles on the topic "Silver brazing"
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Nagano, Toshiki, and Toshiyasu Takei. "Brazing Technology with Silver Brazing Paste." Indian Welding Journal 22, no. 4 (October 1, 1990): 162. http://dx.doi.org/10.22486/iwj.v22i4.148369.
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Fang, Wei Ping, Yao Yong Yi, Feng Mei Liu, Zheng Lin Liu, and Zhen Hua Deng. "Research and Preparation of Silver Free Amorphous Active Brazing Alloy." Materials Science Forum 817 (April 2015): 96–103. http://dx.doi.org/10.4028/www.scientific.net/msf.817.96.
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A silver free amorphous Cu-35Ti-12Ni active brazing alloy was successfully prepared in this work. The crystallinity, microstructure, and chemical composition were characterized with X-ray diffraction (XRD), scanning electron microscope (SEM), and energy-dispersive spectrometry (EDS), respectively. A typical characteristic peak of amorphous material was observed in the XRD pattern. The microstructures and chemical compositions of the silver free amorphous alloy were uniform. Differential scanning calorimetry (DSC) result shows that the amorphous silver free brazing alloy has higher melting temperature than commercial silver brazing alloy (Ag-26.5Cu-1.5Ti). Wetting contact angle and spreading area on Si3N4 ceramic substrate were used to evaluate the wetting ability of brazing alloy. The wetting angle was smaller than 5o, and the spreading area was 141.6 mm2 at 1100°C. The bending strength of silver free brazing alloy/Si3N4 was also carried out. The mechanical test shows that the amorphous Cu-35Ti-12Ni/Si3N4 has higher joint strength (304.7MPa) than the crystal Cu-35Ti-12Ni/Si3N4 (294.7MPa) at room temperature.
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Dirnfeld, S. F., R. Gabbay, J. J. Ramon, and H. J. Wagner. "Copper embrittlement by silver brazing alloys." Materials Characterization 26, no. 1 (January 1991): 17–22. http://dx.doi.org/10.1016/1044-5803(91)90004-n.
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Binchiciu, Emilia, Traian Fleșer, and Ionelia Voiculescu. "Composite Rods for Brazing." Advanced Materials Research 1029 (September 2014): 72–77. http://dx.doi.org/10.4028/www.scientific.net/amr.1029.72.
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The paper presents research conducted for the development of precursors and wrapped rods for brazing, that deposit, through melting, two different alloys, with respect to the level of silver alloying and the melting temperature. The alloy with the high silver content is introduced under the form of powder, in the coating of the brazing rods, in a participation proportion that assures a buffer layer, with advance proprieties of diffusion in the base metal and in the core alloy of the coated rod. The participation ratio of the silver rich powder alloy is established within the following limits 8-12%, depending on their melting point, the grinding degree and mixing with the deoxidizer coat. The development of the precursors was made by homogeneous melting and spraying on a oblique plan, the grains obtained were grounded, the grist obtained is considered optimum to be introduced in the coating mixture after it successfully passed through a sieve with a mesh of 0.1 mm. The alloyed precursors with 45% silver, grounded between the above mentioned limits, were introduced in the deoxidizer coat mixture af the bare rods type Ag30 according to SR EN 1044/1999. The resulted mixture was used to manufacture experimental lots of covered rods for brazing, which were used for testing, in order to achieve highly important joints. The melting temperature of the precursors was established through micro-alloying so that it will be 10-15°C higher than that of the deoxidizer coat, which in turn has a lower melting temperature, by 56-60°C, than the melting temperature of the core alloy. The deoxidizer coat is usually fluoroboric type, conforming to SR EN 1045/2001. Representative joints made with the new experimental rods, after testing, presented results consistent with the requirements, which allowed the authors to appreciate this method as appropriate for cost reduction with brazing materials in the use of composite coated rods.
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Fokanov, A. N., V. F. Podurazhnaya, A. V. Tebyakin, and V. S. Kaskov. "Brazing the beryllium window in copper frame by silver brazing alloy." Proceedings of VIAM, no. 11 (November 2016): 1. http://dx.doi.org/10.18577/2307-6046-2016-0-11-1-1.
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Winiowski, A., and M. Rózanski. "Impact of Tin and Nickel on the Brazing Properties of Silver Filler Metals and on the Strength of Brazed Joints Made of Stainless Steels." Archives of Metallurgy and Materials 58, no. 4 (December 1, 2013): 1007–11. http://dx.doi.org/10.2478/amm-2013-0118.
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Abstract The research involved vacuum tests of brazing properties of silver filler metals, containing tin as well as tin and nickel, and used in brazing of chromium X6Cr17 and chromium-nickel X6CrNiTi18-10 stainless steels. The research also involved testing the strength and structural properties of brazed joints made of these steels. The tests were conducted on filler metals (silver brazing alloys) B-Ag68CuSn-730/755 (Ag68Cu28Sn4) and B-Ag65CuSnNi-740/767 (Ag65Cu28Sn5Ni2) and also, for comparative purposes, on the filler metal B-Ag72Cu-780 (Ag 272 according to PN-EN ISO 17672), most commonly applied in the vacuum brazing of high alloyed stainless steels. The brazing properties of the filler metals were tested by determining their wettability by means of the spreadability method. The strength of brazed joints made of the stainless steels was examined in a shear test. Research-related structural tests involved light and electron microscopy with an energy dispersive spectrometer (EDS). The comparative analysis of the properties of the filler metals revealed the positive impact of tin and nickel on the spreadability and wettability of the silver brazing alloys as well as on the quality and the shear strength of brazed joints.
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Karpiński, Marcin. "Silver Based Brazing Composites for Trimetalic Components." Key Engineering Materials 641 (April 2015): 99–104. http://dx.doi.org/10.4028/www.scientific.net/kem.641.99.
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The paper presents the aspects of trimets manufacturing related to raising quality and economic demands. The comparison of two types of alloys used as a filler metal has been performed. Modification of the chemical composition of brazing alloy, currently used for trimet composite strips in terms of lower silver contents has been proposed. The joining of conventional cemented carbides with steel has been investigated.
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Leach, Robert H., and Leo Edelson. "SILVER BRAZING ALLOYS IN THE MARINE FIELD." Journal of the American Society for Naval Engineers 51, no. 1 (March 18, 2009): 56–79. http://dx.doi.org/10.1111/j.1559-3584.1939.tb01452.x.
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Berezhnyy, Stanislav, Oleksii Kapustian, Ruslan Kulykovskyi, Ihor Avdeev, and Danylo Uriekin. "Development of resource-saving and environmentally safe beryllium bronze soldering technology." Scientific journal of the Ternopil national technical university 100, no. 4 (2020): 46–54. http://dx.doi.org/10.33108/visnyk_tntu2020.04.046.
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The composition of the solder, which provides the necessary technological properties of the product, namely, electrical conductivity and mechanical strength of the junction was selected. The possibility of brazing beryllium bronze with a silver contact plate by furnace brazing using fluxes based on NaCl: CaCl2: CaF2 salts, respectively (24: 61: 15% mass) in the atmosphere was established. The possibility of brazing BrB2 beryllium bronze in the atmosphere using a research flux based on the eutectic of the NaCl – CaCl2 system (28…72% wt.) adding 15% CaF2 over a copper layer is shown. The technology for brazing beryllium bronze BrB2 with silver contact plates with silver solder PSr68 has been developed. The brazing process is combined with the hardening operation, which allows avoiding additional thermal operations; flux residues are removed during hardening and do not actually need additional cleaning operations; applied solder, flux components and technologies for applying a layer of copper are not scarce and relatively cheap, which can significantly reduce the cost of the product, subject to the requirements of the technical specifications. A technological process that makes it possible to refuse of using vacuum systems and toxic fluxes has been developed.
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Podsiadło, Marcin, Lucyna Jaworska, and Piotr Klimczyk. "Direct brazing of diamond to the tool body – brazing binders and methods." Mechanik 92, no. 8-9 (September 9, 2019): 520–23. http://dx.doi.org/10.17814/mechanik.2019.8-9.63.
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The article presents the problem of direct brazing of diamond to the tool body. The greatest threats to the brazing joint were discussed: stress and poor wettability. Methods for producing polycrystalline diamond blanks by various methods were presented. The metal alloys (solders) with a silver, nickel and copper matrix that is used for brazing diamonds were described. The most commonly used brazing methods (resistance, induction, laser and infrared) were discussed.
Dissertations / Theses on the topic "Silver brazing"
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Snell, Robert. "The development of novel silver brazing alloys." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/19644/.
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This research was primarily focussed on finding novel silver brazing alloys. The first alloy development method used to achieve this goal was a CALPHAD-based approach. This was used to predict melting temperatures and the intermetallic content of alloys. The method was developed and then applied to a commonly used silver brazing alloy. An alternative method was developed based on High Entropy Alloys (HEAs).
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Kassam, Tahsin Ali. "The effects of Alumina purity, TICUSIL® braze preform thickness and post-grinding heat treatment on the microstructure, mechanical and nanomechanical properties of Alumina-to-Alumina brazed joints." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/15311.
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Alumina-to-alumina brazed joints were formed using 96.0 and 99.7 wt.% Al2O3 ceramics in as-ground and in ground and heat treated conditions using TICUSIL® (68.8Ag-26.7Cu-4.7Ti wt.%) braze preforms of thicknesses ranging from 50 to 250 μm. Brazing was conducted in a vacuum of 1 x 10-5 mbar at 850 °C for 10 minutes. Joint strengths were evaluated using four-point bend testing and were compared to the flexural strengths of standard test bars according to ASTM C1161-13. Post-grinding heat treatment, performed at 1550 °C for 1 hour, did not affect the average surface roughness or grain size of either grade of alumina but affected their average flexural strengths, with a small increase for 96.0 wt.% Al2O3 and a small decrease for 99.7 wt.% Al2O3. Post-grinding heat treatment led to secondary phase migration, creating a fissured 96.0 wt.% Al2O3 surface. This affected the reliability of 96.0 wt.% Al2O3 brazed joints, in which braze infiltration was observed. As the TICUSIL® braze preform thickness was increased from 50 to 150 μm, the average strengths of both 96.0 and 99.7 wt.% Al2O3 brazed joints improved. This occurred due to a microstructural evolution, in both sets of joints, which was studied using SEM, TEM and nanoindentation techniques. An increase in the TICUSIL® braze preform thickness increased the amount of Ti which was available to diffuse to the joint interfaces. This led to increases in both, reaction layer and braze interlayer thicknesses. Excess Ti in joints that were made using TICUSIL® braze preforms thicker than 50 μm, led to relatively hard Cu-Ti phases in an Ag-Cu braze interlayer. Cu-Ti phase formation, which may have reinforced joint strength whilst also reducing CTE mismatch at the joint interface, also led to Ag-rich braze outflow at the joint edges. Brazed joints made using as-ground 96.0 wt.% Al2O3 consistently outperformed brazed joints made using as-ground 99.7 wt.% Al2O3, due to the formation of Ti5Si3 phases at locations where the Ti-rich reaction layer intersected with the triple pocket grain boundary regions of the as-ground 96.0 wt.% Al2O3 surface.
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Hausner, Susann, Martin Franz-Xaver Wagner, and Guntram Wagner. "Microstructural Investigations of Low Temperature Joining of Q&P Steels Using Ag Nanoparticles in Combination with Sn and SnAg as Activating Material." MDPI AG, 2019. https://monarch.qucosa.de/id/qucosa%3A33164.
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Quenching and partitioning (Q&P) steels show a good balance between strength and ductility due to a special heat treatment that allows to adjust a microstructure of martensite with a fraction of stabilized retained austenite. The final heat treatment step is performed at low temperatures. Therefore, joining of Q&P steels is a big challenge. On the one hand, a low joining temperature is necessary in order not to influence the adjusted microstructure; on the other hand, high joint strengths are required. In this study, joining of Q&P steels with Ag nanoparticles is investigated. Due to the nano-effect, high-strength and temperature-resistant joints can be produced at low temperatures with nanoparticles, which meets the contradictory requirements for joining of Q&P steels. In addition to the Ag nanoparticles, activating materials (SnAg and Sn) are used at the interface to achieve an improved bonding to the steel substrate. The results show that the activating materials play an important role in the successful formation of joints. Only with the activating materials, can joints be produced. Due to the low joining temperature (max. 237 °C), the microstructure of the Q&P steel is hardly influenced.
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Spektor, Matias. "Equivocal engagement : Kissinger, Silveira and the politics of U.S.-Brazil relations (1969-1983)." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439318.
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Spektor, Matias. "Equivocal engagement: Kissinger, Silveira and the politics of US-Brazil Relations 1969-1983 (Introduction)." Oxford University Press, 2007. http://hdl.handle.net/10438/4179.
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Lüders, Pedro Christian. "Portugal e o comércio do Rio da Prata (1640 - 1680)." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/8/8137/tde-13042017-095614/.
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A política de Portugal acerca de seu Império no Atlântico Sul é bastante consistente ao longo de toda a segunda metade do século XVII. Em face das dificuldades em torno de sua Restauração em 1640, a Monarquia Portuguesa desenvolverá um plano coerente de integração entre diversos pontos estratégicos espalhados pelo Oceano Atlântico. Serão eles o Brasil e sua produção de açúcar, a África e seu tráfico de escravos, e o Rio da Prata e seu contrabando de metal. Ao aspirar, para seu proveito econômico, o controle das rotas marítimas que integravam estes espaços entre si e com a Europa, disputando-as com outras potências, a Coroa de Portugal responderá aos desafios que a Restauração lhe impunha por meio de objetivos permanentes que, não obstante alterações conjunturais, serão desenvolvidos e perseguidos durante as décadas seguintes, até culminarem na fundação da Nova Colônia do Sacramento em 1680.Portugal´s policy about its Empire in the South Atlantic is quite consistent during all the second half of the 17th century. Because of the difficulties around its Restoration in 1640, the Portuguese Monarchy would develop a coherent plan of integration between several strategic points spread in the Atlantic Ocean. They would be Brazil and its production of sugar, Africa and its slave trade, and the Rio de la Plata and its contraband of metals. By aspiring, for its own economic sake, the control of the maritime routes which integrated those places between themselves and with Europe, disputing them against other powers, the Crown of Portugal would answer the challenges imposed by the Restoration with permanent objectives which, despite changes in conjuncture, would be developed and pursued during the following decades, until its culmination in the foundation of Nova Colônia do Sacramento in 1680.
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Caldas, Fabio Ciaccia Rodrigues. "CAMPANHA PRESIDENCIAL DE ARTHUR DA COSTA E SILVA: A festa da democracia autoritária." Universidade Metodista de São Paulo, 2010. http://tede.metodista.br/jspui/handle/tede/923.
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Previous issue date: 2010-05-23In 1966 the first Military Government was ending in Brazil. Two groups were sharing the political power: The Army Forces, called Sorbonne and Linha Dura . This wanted the Ministry of War, Arthur da Costa e Silva, as a successor of the former President Castello Branco. Costa e Silva made his political campaign running around Brazil to know about the national problems and to show his proposal. The unusual think is the fact that the election was indirect and just the members of National Congress were entitled to vote, so the population was a part of the process. The objective of this research is to profile the Marshal Arthur da Costa e Silva though history facts that made him, in 1966, a candidate for Presidency of the Republic and to understand the marketing strategy used. The methodology to be used was literature, semi-structure interviews with people that were living at the time, and content analyses of the newspapers: O Estado de São Paulo and Jornal do Brasil. The objective was to show their positions during the campaign of the Presidential Election in 1966.
Em 1966 o Brasil chegava ao término do primeiro governo do regime militar. Disputavam o poder dois grupos das Forças Armadas, a Sorbonne e a Linha Dura. Esta indicou o nome do Ministro da Guerra Arthur da Costa e Silva como candidato à sucessão do Presidente Castello Branco. Costa e Silva fez campanha, percorrendo o Brasil para conhecer os problemas nacionais e apresentar suas propostas. O inusitado está no fato de a eleição ser indireta e apenas os membros do Congresso Nacional ter direito a voto, estando a população à margem da escolha do novo mandatário do país. O objetivo do trabalho é traçar o perfil do Marechal Arthur da Costa e Silva levantando fatos históricos que o tornaram, em 1966, um candidato viável à Presidência da República do Brasil e compreender a estratégia de marketing eleitoral utilizada. O trabalho utilizou como metodologia a pesquisa bibliográfica, entrevistas semiestruturadas com personagens que viveram a época e análise de conteúdo dos jornais O Estado de São Paulo e Jornal do Brasil, para indicar suas posições na cobertura das eleições presidenciais de 1966.
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Silva, Aline Cavalcante e. "História e cultura histórica: a escrita negra de Oliveira Silveira (1962-2009)." Universidade Federal da Paraíba, 2015. http://tede.biblioteca.ufpb.br:8080/handle/tede/8375.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
This work is part of a research on the historical trajectory of african-Brazilian intellectual, Oliveira Silveira, while black militant, through a historiographical analysis about his poetry, described here within the perspective of "historical records" in the process of rewriting the history of black people in Brazil and in the diaspora. We also intend to analyze the political option for choosing the day of November 20 as the Africanist date in Brazil, within the time frame of 1962 (publication date of Oliveira's first work) and 1988 (the one century anniversary of the slavery abolition in Brazil and criminalization of racism in the Brazilian Constitution). Therefore, the research aims to bring light to black peoples's cultural affirmation in Brazilian society developed by the writer in his Africanists representations built through his poetry and political writings - in which the poet uses his words to fight against racism and to value the black culture in society. The research will be based on the poetry of Oliveira Silveira from 1962/1988 merged with the collective documentation produced under the Unified Black Movement (1978-1988).
A presente dissertação caracteriza-se como uma pesquisa acerca da trajetória histórica do intelectual afro-brasileiro, Oliveira Silveira, enquanto militante negro, tomando por base uma análise historiográfica no que concerne à sua produção poética, entendida como “registros históricos” produzidos no processo de reescrita da história do negro no Brasil e na diáspora. Nesse contexto, a pesquisa tem como objetivo elencar as práticas de afirmação do negro na sociedade brasileira desenvolvidas pelo escritor, a partir das representações africanistas construídas por intermédio de suas poesias e escritos políticos, em que o poeta utiliza suas palavras como arma na luta contra o racismo e valorização do negro na sociedade. Além disso, analisamos também a opção política pelo dia 20 de novembro, como data africanista no Brasil. Para tanto, o recorte temporal situa-se entre os anos de 1962, momento em que ocorre a publicação da primeira obra do escritor, e 1988, cem anos da “Abolição” no Brasil e criminalização do racismo na Constituição brasileira. Em relação às fontes, a pesquisa teve como enfoque a análise documental da produção poética de Oliveira Silveira dentro do recorte temporal proposto, associada à documentação coletiva produzida no âmbito do Movimento Negro Unificado.
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Silva, Jose Otavio Motta Pompeu e. "A psiquiatra e o artista : Nise da Silveira e Almir Mavignier encontram as imagens do inconsciente." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/284773.
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Orientador: Lucia Helena ReilyDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Artes
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Resumo: O objetivo desta pesquisa foi investigar os primeiros anos (de 1946 a 1957) do ateliê de pintura - localizado no hospital psiquiátrico do Engenho de Dentro, no Rio de Janeiro, Brasil - do ponto de vista dos artistas plásticos envolvidos, bem como a sua repercussão no campo da arte. Os dados foram coletados por meio de entrevistas com pessoas que participaram do início deste ateliê, análise de gravações em vídeo do acervo do Museu de Imagens do Inconsciente, revisão bibliográfica, incluindo consulta a jornais e revistas da época para reconstruir um panorama histórico sobre o ateliê de pintura. A literatura já mostrou como a psiquiatra Nise da Silveira, uma das mais importantes personalidades femininas do século passado no Brasil, associou-se ao jovem artista Almir Mavignier para criar um ateliê que usava a arte como recurso terapêutica no tratamento de um grupo de internos do hospital psiquiátrico. O presente estudo buscou reconstituir partes ignoradas desta história: como os internos foram convidados a freqüentar o ateliê, a atuação de Mavignier no desenvolvimento das atividades de arte, como se deu a confluência de outros artistas ao Engenho de Dentro, instigados pela produção plástica dos pacientes psiquiátricos e a organização de exposições em espaços culturais bem como em eventos de saúde mental. A produção plástica realizada neste ateliê, que deu origem ao Museu de Imagens do Inconsciente, ganhou notoriedade entre os críticos de arte da época, sendo exposta em importantes museus, como o Museu de Arte Moderna de São Paulo. Este estudo buscou mostrar os processos por meio dos quais os críticos tiveram contato com o trabalho. As obras do Museu de Imagens do Inconsciente foram reconhecidas internacionalmente por personalidades como C. G. Jung e Albert Camus. A produção plástica realizada neste ateliê também teve ressonância em artistas contemporâneos como Francisco Brennand, Ivan Serpa e Abraham Palatnik, que visitaram este ateliê. O estudo sugere que o fato de um artista plástico desenvolver os trabalhos no ateliê no contexto psiquiátrico representa um diferencial nos resultados. Concluímos que este ateliê de pintura faz parte do mosaico da história da arte no Brasil e que seu estudo mais sistemático nas diversas fases pode trazer contribuições para reflexões interdisciplinares nos campos da arte, saúde mental, e educação
Abstract: This study aimed to investigate the early years (from 1946 to 1957) of the art studio of the Engenho de Dentro Psychiatric Hospital in Rio de Janeiro, Brazil, from the point of view of the artists involved in the project, as well as its repercussions in the art world in Rio and São Paulo. Data was collected through interviews with participants who worked during the first years of the studio, analysis of video recordings from files owned by the Museu de Imagens do Inconsciente, and review of the literature, including research into articles published in newspapers and magazines of the period, all of which helped to reconstruct a historical ambience for this painting studio. Publications have shown how Nise da Silveira, psychiatrist, one of the most important Brazilian female figures of the last century, became associated with Almir Mavignier, visual artist, who together created the studio where art was to be used as a therapeutic resource for treating a group of patients at the psychiatric facility. The present study attempted to reconstruct unknown parts of this story: how eleven patients were chosen and invited to go to the studio, Mavignier's way of proposing and organizing art activities, how other visual artists began to flock to the Engenho de Dentro instigated by the artistic production of the psychiatric patients, and the organization of exhibits in culture centers, as well as mental health conferences. The visual arts products that came out of this studio, which gave way to the renowned Museu de Imagens do Inconsciente, began to intrigue art critics, and were exhibited in major museums, such as the Museum of Modem Art in São Paulo. This study aimed to show the processes whereby the critics came into contact with the work of psychiatric patients and their role in divulging these images." The production of the Museu de Imagens do Inconsciente was recognized internationally by people such as C. G. Jung and Albert Camus. There was also significant response from contemporary Brazilian artists such as Francisco Brennand, Ivan Serpa and Abraham Palatnik, all of whom visited the studio. This study suggests that the fact that a visual artist headed the work done at the studio in the psychiatric environment affected the results in important ways. We conclude that this painting studio is part of the mosaic of Brazilian art history and that a thorough study of the various phases in the history of the studio will bring important contributions to interdisciplinary thinking in the fields of art, mental health and education
Mestrado
Mestre em Artes
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Silva, Daniela Maura Abdel Nour Ribeiro da. "A fotografia na arte contemporânea e o terreno da ficção: Regina Silveira e Carlos Fadon Vicente." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/8/8138/tde-11012016-124401/.
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Esta tese parte dos contextos de obras de Regina Silveira (Porto Alegre, RS, 1939) e Carlos Fadon Vicente (São Paulo, SP, 1945), realizadas a partir dos anos de 1970, para reflexão e problematização sobre as relações entre fotografia e ficção, na arte contemporânea. Entre os artistas brasileiros que tiveram importante atuação nos anos 1970 no uso da fotografia como elemento de suas obras, ou como fotógrafos, este estudo enxerga em Regina Silveira e Carlos Fadon Vicente pesquisas seminais e declaradas em torno da representação e do debate sobre a visualidade, que persistem até hoje. Este estudo reconhece também similaridades nas obras dos dois artistas, mesmo que trabalhadas de modo diferente, no que concerne ao uso de elementos que levam à problematização do conceito de representação e à ideia de ficção. A dualidade entre arte e fotografia e vice-versa, permeia toda a tese. Da mesma forma, o debate em torno da ficção dado a partir da ideia de terreno como conjunto de significados capaz de problematizar diversas noções de ficção: fingir, imitar, parecer semelhante, real, verdadeiro, fidedigno, verossímil. Iludir, encenar, construir, falsificar. Tornar ambíguo, virtual, simular. O ponto fulcral da questão reside no jogo em torno da representação, da natureza artificiosa da imagem fotográfica. A fotografia permeia o campo das Artes Visuais e o da própria Fotografia, como suporte mediático que possibilita se pensar a questão da representação, o embate entre as noções de realidade e de ficção e a permeabilidade entre ambas: a ficção pode constituir uma realidade em si mesma. A ideia de ilusão explorada e demonstrada a partir do uso da fot ografia como fonte ficcional. As reflexões giram ao redor do debate sobre a representação na ou por meio da fotografia. As noções de ilusão, ficção e simulacro se manifestam de maneira semelhante e intercambiável tanto quando estamos diante da fotografia (tout court), como de uma obra visual que tem a fotografia como base. Quando o assunto é fotografia, alguns debates entram em pauta. Por exemplo, a questão da fotografia como documento, como memória; o embate entre real e ficcional; a fotografia como arte; a postura do fotógrafo perante a fotografia. No momento em que o assunto é arte contemporânea, outros debates ao redor da fotografia, e da própria arte, são suscitados como o caso em que a fotografia está presente como componente da obra, e, dessa forma, de que maneira ela dialoga com a arte e cria sentidos semelhantes àqueles quando se trata da fotografia tout court. Observam-se as especificidades da fotografia e seu trânsito entre os campos, Arte e Fotografia, permeando-os, de modo a refletir sobre o que acontece quando está no campo da Arte Contemporânea e de que forma contribui para trazer à tona uma discussão sobre ficção e representação. Como faceta metodológica, este estudo emprega, além das imagens das obras visuais, entrevistas com os dois artistas e documentos de época, de modo a contextualizar, esclarecer e enriquecer o debate e a reflexão empreendidos na tese.This thesis comes from the context of works by Regina Silveira (Porto Alegre, RS, 1939) and Carlos Fadon Vicente (São Paulo, SP, 1945), carried out from the 1970s, for reflection and problem contextualization about relationships between photography and fiction in contemporary art. Among Brazilian artists, who had important performances in the 70s as photographers or with the use of photography as an element of their work, this study is complied with Regina Silveira and Carlos Fadon Vicente seminal researches over representation and declared debate on visuality, that persists todays. This study also recognizes similarities in the works of both artists, even if accomplished in a different manner in what concerns the usage of elements that lead to the questioning of the concept of representation and the idea of fiction. The duality between art and photography and vice-versa, involves all the theses. Similarly, the debate around fiction given from the idea of terrain as a set of meanings capable to bring problems to several notions of fiction: pretending, imitating and looking similar, real, truthful, faithful, credible: illusion, staging, building, faking. Make it ambiguous, virtual, simulated. The crucial point of the question resides around the representation of the artificial nature of the photographic image. The photograph lines up with the field of Visual Arts and of Photography itself as a media support that enables to think of the representation question, the clash between the notions of reality and fiction and the permeability between the two: fiction can constitute a reality in itself. The idea of illusion exploited and demonstrated through the use of photography as a fictional source. Reflections turn around the debate over representation on photography or through its means. Notions of illusion, fiction and simulation show themselves in a similar and interchangeable manner, as well as when we are before a photograph tout court, or before a visual work with a photography basis. When the subject is photography, some debates arise, for instance: the issue of photography as a document, as a source of memory; the draw between whats real and fictional; photography as an art and the photographers attitude before the photograph. When it comes to contemporary art, other debates arise around photography, and art itself, it comes to the case when photography is present as a component of the work, and, this way, exposes the manner it creates a dialog with art and similar meanings to those related to photography tout court. The specifics of photography are observed, as well as its transit among the fields, Art and Photography, lining them up, so as to reflect what happens in the sphere of Contemporary Art and the way it contributes to arouse a discussion about fiction and representation. As a methodological asset, this study applies, on top of visual work images, interviews with the two artists and a set of documents, in such a way to contextualize, clarify and enrich the debate and reflection invested in the thesis.
Books on the topic "Silver brazing"
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Fantacci, Silvia, ed. Ruggero Jacobbi. Florence: Firenze University Press, 2008. http://dx.doi.org/10.36253/978-88-8453-688-4.
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"Ah, if only I were not so alive and so crowded with things, what a book I would write […] but there's so little time […]. There's lots of time to map them out, that's true, but it's not enough." This is the voice of the protagonist of Convalescenza, one of the stories in this book that – thanks to the painstaking editorial attention of Silvia Fantacci – presents the prose written by Ruggero Jacobbi starting from his precocious youth through to the Sixties. The nine sections, recording fragments of memories, vestiges of mystery and bitter solitude, meander between cinema and theatre, revoke the faces of the war, recall the figures of writers and friends, suggest new approaches to reading. The evocation of Brazil, where Jacobbi spent the most important fifteen years of his life, is not lacking: a country "so big as to drive you crazy" with its magical rites, its rhythm, its culture (the music of Villa-Lobos, Vinícius de Morais and Dorival Caymmi and the poetry of his friend Murilo Mendes). The meticulous notes and the appendix at the end of the book illustrate the history of each text and offer a reconstruction of the projects for novels and stories that were left unfinished and have now finally been transferred from the mind and desk of the writer into book form.
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Induction Coil-builder Training Manual: "Silver Solder Brazing". Outskirts Press, 2018.
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Plumlee, Scott David. Silver soldering simplified: A new jewelry technique you can do at home. 2013.
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Plumlee, Scott David. Silver Soldering Simplified: A New Jewelry Technique You Can Do at Home. Potter Craft, 2013.
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Tolle, Michael C. Ductile facture of metals under high triaxial stress states. 1993.
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Muldrew, Craig. Atlantic World 1760–1820. Edited by Nicholas Canny and Philip Morgan. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780199210879.013.0036.
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There would have been no Atlantic world without trade. Throughout this period, the consumption of American-produced sugar, tobacco, and coffee, as well as the use of American gold and silver for money, was common throughout Europe. At the same time, the settlement of colonial emigrants and transported slave populations continued to grow and to transform the agriculture and environment of the Americas and western Africa. By the mid-eighteenth century the characteristic trading patterns of the Atlantic world were well established. The main exports at the beginning of the period from the New World were gold and silver from the mines of Mexico and Peru, as well as sugar and tobacco grown in Brazil, the Caribbean, and the Chesapeake, together with furs and cod from Canada and forest products from New England. We should not forget that people were also traded; European traders purchased an ever-increasing number of slaves in Africa for export to the Americas. Britain emerged as the dominant trading, military, and investment force by the nineteenth century.
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Jiménez, Catalina, Julen Requejo, Miguel Foces, Masato Okumura, Marco Stampini, and Ana Castillo. Silver Economy: A Mapping of Actors and Trends in Latin America and the Caribbean. Inter-American Development Bank, 2021. http://dx.doi.org/10.18235/0003237.
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Latin America and the Caribbean, unlike other regions, is still quite young demographically: people over age 60 make up around 11% of the total population. However, the region is expected to experience the fastest rate of population aging in the world over the coming decades. This projected growth of the elderly population raises challenges related to pensions, health, and long-term care. At the same time, it opens up numerous business opportunities in different sectorshousing, tourism, care, and transportation, for examplethat could generate millions of new jobs. These opportunities are termed the “silver economy,” which has the potential to be one of the drivers of post-pandemic economic recovery. Importantly, women play key roles in many areas of this market, as noted in the first report published by the IDB on this subject (Okumura et al., 2020). This report maps the actors whose products or services are intended for older people and examines silver economy trends in the region by sector: health, long-term care, finance, housing, transportation, job market, education, entertainment, and digitization. The mapping identified 245 actors whose products or services are intended for older people, and it yielded three main findings. The first is that the majority of the actors (40%) operate in the health and care sectors. The prevalence of these sectors could be due to the fact that they are made up of many small players, and it could also suggest a still limited role of older people in active consumption, investment, and the job market in the region. The second finding is that 90% of the silver economy actors identified by the study operate exclusively in their countries of origin, and that Mexico has the most actors (47), followed by the Southern Cone countriesBrazil, Chile, and Argentinawhich have the regions highest rates of population aging. The third finding is that private investment dominates the silver economy ecosystem, as nearly 3 out of every 4 actors offering services to the elderly population are for-profit enterprises. The sectors and markets of the silver economy differ in size and degree of maturity. For example, the long-term care sector, which includes residential care settings, is the oldest and has the largest number of actors, while sectors like digital, home automation, and cohousing are still emerging. Across all sectors, however, there are innovative initiatives that hold great potential for growth. This report examines the main development trends of the silver economy in the region and presents examples of initiatives that are already underway. The health sector has a wealth of initiatives designed to make managing chronic diseases easier and to prevent and reduce the impact of functional limitations through practices that encourage active aging. In the area of long term careone of the most powerful drivers of job creationinitiatives to train human resources and offer home care services are flourishing. The financial sector is beginning to meet a wide range of demands from older people by offering unique services such as remittances or property management, in addition to more traditional pensions, savings, and investment services. The housing sector is adapting rapidly to the changes resulting from population aging. This shift can be seen, for example, in developments in the area of cohousing or collaborative housing, and in the rise of smart homes, which are emerging as potential solutions. In the area of transportation, specific solutions are being developed to meet the unique mobility needs of older people, whose economic and social participation is on the rise. The job market offers older people opportunities to continue contributing to society, either by sharing their experience or by earning income. The education sector is developing solutions that promote active aging and the ongoing participation of older people in the regions economic and social life. Entertainment services for older people are expanding, with the emergence of multiple online services. Lastly, digitization is a cross-cutting and fundamental challenge for the silver economy, and various initiatives in the region that directly address this issue were identified. Additionally, in several sectors we identified actors with a clear focus on gender, and these primarily provide support to women. Of a total of 245 actors identified by the mapping exercise, we take a closer look at 11 different stories of the development of the silver economy in the region. The featured organizations are RAFAM Internacional (Argentina), TeleDx (Chile), Bonanza Asistencia (Costa Rica), NudaProp (Uruguay), Contraticos (Costa Rica), Maturi (Brazil), Someone Somewhere (Mexico), CONAPE (Dominican Republic), Fundación Saldarriaga Concha (Colombia), Plan Ibirapitá (Uruguay), and Canitas (Mexico). These organizations were chosen based on criteria such as how innovative their business models are, the current size and growth potential of their initiatives, and their impact on society. This study is a first step towards mapping the silver economy in Latin America and the Caribbean, and the hope is to broaden the scope of this mapping exercise through future research and through the creation of a community of actors to promote the regional integration of initiatives in this field.
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Unwrought, Unworked or Semi-Manufactured Silver Research Group The. The 2000 Import and Export Market for Unwrought, Unworked or Semi-manufactured Silver in Brazil. 2nd ed. Icon Group International, Inc., 2001.
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Silver, The, and Platinum Research Group. The 2000 Import and Export Market for Silver and Platinum in Brazil (World Trade Report). 2nd ed. Icon Group International, Inc., 2001.
Find full textBook chapters on the topic "Silver brazing"
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Petrişor, Traian, Bogdan V. Neamţu, A. Rufoloni, M. Cristian Rauca, and Liviu Brânduşan. "Synthesis of Silver Free Eutectic Alloys for Be and Cu99.32Cr0.6Zr0.08 Brazing." In Materials and Technologies, 311–14. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-460-x.311.
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Cabral, Alexandre Raphael, Georges Beaudoin, and Bernd Lehmann. "Sulphur, selenium and silver contents of palladiferous gold from Serra Pelada, northern Brazil." In Mineral Deposit Research: Meeting the Global Challenge, 889–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-27946-6_226.
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Almeida, A. L., W. J. Bruckard, G. J. Sparrow, and J. T. Woodcock. "Investigation of silver extraction from a silver-sulphur flotation concentrate from the electrolytic zinc plant of Companhia Paraibuna de Metais, Juiz de Fora, Brazil." In Mining Latin America/Minería Latinoamerica, 423–49. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1216-1_31.
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Rabinkin, A., F. Reidinger, J. Marti, and L. Bendersky. "Processing, structure and performance of RS “classical” silver-base brazing alloys." In Rapidly Quenched Materials, 256–60. Elsevier, 1991. http://dx.doi.org/10.1016/b978-0-444-89107-5.50066-6.
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Peacock, A. T., M. R. Harrison, D. M. Jacobson, M. Pick, S. P. S. Sangha, and G. Vieider. "Development of silver-free bonding techniques and an investigation of the effect of cadmium in brazed joints made with silver based brazing alloys." In Fusion Technology 1996, 415–18. Elsevier, 1997. http://dx.doi.org/10.1016/b978-0-444-82762-3.50074-4.
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Frank, Zephyr, and Aldo Musacchio. "Brazil in the International Rubber Trade, 1870–1930." In From Silver to Cocaine, 271–99. Duke University Press, 2006. http://dx.doi.org/10.1215/9780822388029-011.
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Frank, Zephyr, and Aldo Musacchio. "Brazil in the International Rubber Trade, 1870–1930." In From Silver to Cocaine, 271–99. Duke University Press, 2006. http://dx.doi.org/10.2307/j.ctv125jnbx.13.
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"10 Brazil in the International Rubber Trade, 1870–1930." In From Silver to Cocaine, 271–99. Duke University Press, 2020. http://dx.doi.org/10.1515/9780822388029-011.
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"5 The Latin American Coffee Commodity Chain: Brazil and Costa Rica." In From Silver to Cocaine, 118–46. Duke University Press, 2020. http://dx.doi.org/10.1515/9780822388029-006.
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"The Art of Silver in Colonial Brazil." In "The Arts in Latin America, 1492–1820". Philadelphia Museum of Art, 2006. http://dx.doi.org/10.37862/aaeportal.00264.015.
Full textConference papers on the topic "Silver brazing"
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Kara-Slimane, A., and D. Treheux. "Prebrazing of Ceramics by Plasma Spraying for Metal-Ceramic Joining." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1513.
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Abstract Traditionnal brazing ailoys does not wet ceramic and therefore are unusable for metal ceramic bonding. To overcome this problem, we have pre-metallized different ceramics (AI2O3, AIN, SiAION) by plasma spraying of copper on ceramics. The good wettability of AgCu or AgCuTi alloy on so-coated ceramics is explained by effect of residual oxygen at interface which favours the thermodynamic adhesion during brazing. The interface analysis showed that silver or titanium segregation occurs at ceramic surface and that, conversely, sprayed copper diffuses in the brazed joint
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Beeranur, Ravikumar, Kiran K. Waghmare, and Ramesh K. Singh. "Characterization of Vacuum Brazing of Ti6Al4V and Alumina With Cu-Ag Brazing Alloy via Substrate-Induced Reactive Mechanism." In ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/msec2013-1218.
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Brazing of ceramic and metal components is an emerging manufacturing technology in which a furnace or a heat source is used to join the substrates using a brazing filler material. Brazing of ceramic and metal has received considerable attention in the field of nuclear reactor, aerospace, automobile, medical and electrical engineering. A brazing alloy can either be a conventional brazing alloy which requires the ceramic surface to be metallized or an active brazing alloy which does not require metallization. A sound interfacial adhesive bond is formed during the process. The typical active elements required in the brazing alloy for bonding of alumina are Ti and Zr. It is expected that since Ti is present in Ti6Al4V, a copper-silver alloy (Cusil™) without an active element can be used for brazing. The Ti substrate itself could provide the reactive element because of dissolution. Vacuum brazing of alumina and titanium with Cusil sheet has been carried out to analyze the characteristics of the joint. Behavior of the joint under different temperature conditions has been studied by thermal cycling of the joint. Uniformity of the joints is confirmed by observing the Scanning electron microscope (SEM) images. The elements and phases present in the joint interface are observed by energy dispersive spectroscopy (EDX) and X-ray diffraction (XRD) analyses. The maximum shear strength obtained in the brazedTi6Al4V/Cusil sheet/alumina joint was 102MPa and the average shear stress was found to be 70±3 MPa. The micro-Vickers hardness test showed that the micro hardness of the interface was lower than the substrates.
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Watabe, Kyogo, Kazuya Mori, Richard Chukwuma Meribe, Yuki Fujishita, Koji Kirihara, and Kazufumi Sakata. "Strength of Brazed Joint and Joint Thickness for Cemented Carbide / Silver Brazing Filler Metal." In International Conference on Industrial Application Engineering 2015. The Institute of Industrial Applications Engineers, 2015. http://dx.doi.org/10.12792/iciae2015.087.
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Kiebach, Wolff-Ragnar, Ruth Knibbe, Kristian B. Frederiksen, Ming Chen, Lars Mikkelsen, and Peter V. Hendriksen. "Investigation of Failure Mechanisms in Ti Containing Brazing Alloys Used in SOFC/SOEC Environments." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33039.
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The two braze alloys TiCuNi® and Silver-ABA® were tested as possible candidates for seals in SOFC or SOEC stacks. The different Ti amount in the samples allowed an evaluation of Ti as a matrix filler and as an active metal/wetting agent in brazing alloys. The sealing ability towards ferritic steel and yttria-stabilized-zirconia (YSZ) was investigated. After the sealing process steel/braze/YSZ joints were further annealed in oxidizing (Air) or reducing (9% H2 in Ar) atmospheres at 750 °C for 150 h. The boundaries of the braze and the joining partners for as-sealed and annealed samples were examined with SEM/EDS. XRD and EXAFS were used to characterize reaction products after the annealing process. Based on these results and taking before reported data into consideration, the advantages and disadvantages of Ti containing seals and the role of Ti in failure mechanism are discussed. Even if the use of Ti in active brazing alloys has its benefits, the disadvantages caused by Ti and its reaction products strongly suggest the use of Ti free brazes in SOFC/SOEC applications.
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Almeida, Pedro, Maruska L. S. Holanda, and Ronaldo O. Almeida. "The structural rehabilitation of the Costa e Silva bridge in Brasília, DF, Brazil." In IABSE Congress, Christchurch 2021: Resilient technologies for sustainable infrastructure. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/christchurch.2021.0638.
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<p>The structural rehabilitation of bridges is generally motivated by the premature aging of the structures and the increased daily traffic of vehicles. In the case of the Costa e Silva Bridge, the rehabilitation was conceived by the Federal District Government due to the partial collapse of the viaduct over the “Galeria dos Estados”, occurred in February 2018, with the same age and the same structural system and due to the relevance for Brasília's transportation system. Also, it was designed by the renowned architect Oscar Niemeyer and the only one designed by him that was built. The bridge is part of the world heritage site of the "Plano Piloto" of Brasília, by UNESCO. The investigation of the structural behavior of the bridge, to verify the need for rehabilitation, was made from visual inspections, geometric and topographic surveys, photographic records, extraction of samples of concrete, analysis of the original building design and after some occurrences along the way of time, structural monitoring. As a result of these investigations, several damages were identified, in particular: cracks in the webs of the box girders, concreting failures, increased permanent overload due to the thickness of the current pavement layer, leaching of concrete and, mainly, approximately 40 cm of deflection at cantilever beams. All of these damages were simulated in the numerical model of the bridge, proving that the excessive deflection at central span is resulted in the loss of prestressing due to stress corrosion and fatigue, reducing structural stiffness and can lead to sudden collapse. As the solution for rehabilitation of the structure was designed a reinforcement with external prestressing to reduce the cracking process and to neutralize the loss of prestressing, due to strands corrosion that can result in broken wires.</p>
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Numadi, Katong Ragawi, and Citra Hennida. "International System as Foreign Policy Determinant Variable: Brazil South-South Policy under Lula da Silva." In Airlangga Conference on International Relations. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0010279505100515.
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Cardoso, Janaina. "MASSIVE OPEN ONLINE COURSES CAMPS: BEFORE AND DURING THE PANDEMIC." In International Conference on Education and New Developments. inScience Press, 2021. http://dx.doi.org/10.36315/2021end072.
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MOOC Camps have been used as a successful blended alternative to more traditional MOOCs (totally online). A “camp” here means “an informal gathering of learners working together to discuss new ideas and concepts” (Sowell, 2019). MOOC Camps combine the positive aspects of MOOCs, such as high-quality of professional development and low cost for participants with the advantages of using the “camps”, such as adaptation to the local context and a simpler way of promoting interaction among participants, who consequently feel highly motivated to complete the online course (Cardoso, 2020). The aim of this presentation is to consider the effects of the physical distance imposed by the COVID-19 pandemic in the MOOC Camps been offered by an extension and research project developed at a public university in Rio de Janeiro, Brazil (CEALD/UERJ) in partnership with the American Government (RELO-Brazil) since 2019. The main objectives of these MOOC camps are: (a) to promote language and methodology development; and (b) to build stronger communities of teachers and teachers-to-be, by giving them the opportunity of sharing their experiences. However, in 2020, due to the pandemic, the camp had to be adapted to a remote mode, using a web-conference platform. Therefore, this action-research study compares and contrasts the MOOC Camp participants’ feedback given before the pandemic with their responses to the activities developed during the pandemic. In this way, the idea is to understand how the adaptations we were forced to make have influenced the development of the camps and possibly affected participants’ interest. The discussion considers some of the advantages and drawbacks of adopting the remote mode for the camps, and a better understanding of some theoretical concepts, such as: blended learning (Gruba et al., 2016); blended MOOCs (Albó et al., 2015; Orsini-Jones, 2018, 2019), online interaction (Silva, 2014), and education in the pandemic context (Liberali, 2020).