Tesis sobre el tema "Plaster"
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Krull, Eriksen Katrine. "Introducing Plaster : Exploring Artistic Expressions of Natural Dyed Plaster". Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-14892.
Texto completoBeach, Elisabeth. "Plaster för framtidens cirkulära ekonomi". Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-25520.
Texto completoIn 2020, the Swedish Parliament passed a motion to move the national economic base from a linear toward a circular economy, but the transition may be moving too slowly. The European Commission (2015) describes a circular economy as ”… where the value of products, materials and resources is maintained in the economy for as long as possible, and the generation of waste minimized, as an essential contribution to the EU's efforts to develop a sustainable, low carbon, resource efficient and competitive economy”. This thesis aims to study future plastics from a circular economy perspective. The thesis has applied Rhetorical Structure Theory (RST) to produce systematic literature analysis with the intention of identifying and critically evaluating research to answer a specific research question. The review proceeded through a plan that included both qualitative and quantitative corpus research to find, mark and count instances of the use of concepts and identify conjunctions between them, that is so called coherence conjunctions. A qualitative comparative content analysis between corpora has been used involving independent scientific articles and reports from commissioned investigations appointed by the Swedish government. Based on the problem description, the purpose of this thesis is to develop knowledge about the possibilities and place of plastics in a future circular economy using previous research. Through a study of existing research, the main questions for the thesis are the following: - Plastics of the future? - A biodegradable plastic, does it play a role in the society? - What are the prospect for biobased plastics and biodegradable plastics? - What might our future society look like? We left the old donate and repair society for a buy and sell society and there are economic theories of to what was the driving incitements to that. One of which was accessibility of cheap labour, new construction technology for factories and warehouses and a new transport network that enabled factories to produce and transport goods within effectively and increase the surplus value of production (i.e. profit). Now today when global environmental challenges threaten the sustainability and profitability of this form of consumption economy efforts have emerged to uncover new production forms. A circular economy with elements of the old donate and repair society is one of them. It demands redesigning production to increase service life for plastic products. The future of plastic is at a crossroads that requires a combination of new policy instruments and changes in behaviour and research. The result is based on an analysis of the study’s literature corpus regarding information on plastics role in a circular- and bioeconomy society where its function is put in relation to its environmental benefits and its ability for a spot in a recycling society. Together with an increase in crude oil and policy instruments in the form of tax reductions and subsidies for commercial activities who want to become more sustainable it enables a future circular economy. The aim of this thesis has been fulfilled, but the complexity of the subject has led to unanswered research questions due to factors that lie somewhat outside the scope of the study.
Reid, Bronwyn. "Cast architectural ornament : plaster and compo". Virtual Press, 2001. http://liblink.bsu.edu/uhtbin/catkey/1214384.
Texto completoDepartment of Architecture
Song, Kyung-Min, Jonathan Mitchell y Lynn F. Gladden. "Observing microstructural evolution during plaster hydration". Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-192277.
Texto completoSong, Kyung-Min, Jonathan Mitchell y Lynn F. Gladden. "Observing microstructural evolution during plaster hydration". Diffusion fundamentals 10 (2009) 22, S. 1-3, 2009. https://ul.qucosa.de/id/qucosa%3A14113.
Texto completoAlexandersson, Charlotte y Wiveca Sundström. "Designförslag på sportflaska". Thesis, University West, Department of Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-737.
Texto completoVillaseñor, Alonso M. I. "Lowland Maya lime plaster technology : a diachronic approach". Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/1446427/.
Texto completoBerchtold, Thomas E. "Accuracy and reliability of plaster models vs electronic models". Thesis, Birmingham, Ala. : University of Alabama at Birmingham, 2010. https://www.mhsl.uab.edu/dt/2010m/berchtold.pdf.
Texto completoNapier, William John. "Kinship and politics in the art of plaster decoration". Thesis, University of Dundee, 2012. https://discovery.dundee.ac.uk/en/studentTheses/5898b964-6fcf-40b5-9bba-b059ffa7178a.
Texto completoSandberg, Filiph. "Flambehandling som metod för ökad vätbarhet av polyolefina plaster". Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-179602.
Texto completoFlytande, trycksatt naturgas i glasfibertankar blir till en allt vanligare energikälla för transportsektorn. De färdiga bränsletankarna består av en plasttank omsluten av glasfiber för att nå upp till den hållfasthet som krävs. Innan glasfibern kan appliceras måste plastens yta genomgå en flambehandling för att öka plastens ytenergi. I detta arbete görs en utredning på ett tidigare flambehandlingssytem som inte kunde ge plasten de egenskaper som krävs för att ge glasfibermatrisen möjligheten att fästa. Åtgärderna är att implementera ett nytt brännarsystem som lever upp till kriterierna och sedan utröna de olika faktorerna som påverkar behandlingen. Detta kan åstadkommas genom en reducerad försöksplanering som metod för att utvärderade bidragande faktorernas påverkan. Lösningen är att förse en öppen bandbrännare med luft och gas genom en Venturimixer. Detta möjliggör en injustering av lambdavärded till 1.07, som är ett viktigt förhållande för att uppnå maximal vidhäftningsförmåga på plastens yta. Lågans stökiometriska förhållande är av stor betydelse för att ge plasten den polär yta som höjer dess vätbarhet och vidhäftningsförmåga. Andra betydande faktorer adresseras i rapportens diskussionsdel.
Balksten, Kristin. "Traditional lime mortar and plaster : Reconstruction with emphasis on durability". Doctoral thesis, Chalmers Tekniska Högskola, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-220119.
Texto completoLiu, Yifan. "Preparation and properties of oral adhesive plaster containing Periplaneta extract". Магістерська робота, Kyiv National University of Technology and Design, 2021. https://er.knutd.edu.ua/handle/123456789/19275.
Texto completoKomarova, O. P. y I. Y. Korneev. "Development of a new sticky material for medical adhesive plaster". Thesis, Харківський національний медичний університет, 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/19466.
Texto completoUğurlu, Elif Böke Hasan. "Characterization of Horasan plasters from some Ottoman baths in İzmir/Elif Uğurlu;thesis advisor Hasan Böke". [s.l.]: [s.n.], 2005. http://library.iyte.edu.tr/tezler/master/mimarirestorasyon/T000342.pdf.
Texto completoInduni, Bruce. "An investigation into the survival of medieval plaster in Dorset churches". Thesis, University of Plymouth, 2006. http://hdl.handle.net/10026.1/1122.
Texto completoMullen, S. Russell. "Accuracy of performing space analysis using emodels[TM] and plaster models". Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3302.
Texto completoTitle from document title page. Document formatted into pages; contains vii, 56 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 36-39).
Petersson, Hanna y Sofia Roslund. "Tvättemission : En undersökning av polyesterplaggs fiberutsläpp vid hushållstvättning". Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-202.
Texto completoThe marine environment today, has become the end station for plastics, waste from wastewater and general litter. Large quantities of plastic particles of different sizes have been detected in the ocean, with resulting animals ingesting this mistaking it for food. Science shows that a large part of these plastic fragments are of microscopic size, named microplastics, and within this group there are textile fibres that like other plastics are resistant and detrimental to nature. Studies have shown that when washing, the wastewater carries these small textile fibres and allows them to pass trough the purification. PET is one of the most used plastics and common in polyester fibre manufacture, by far the most used material in textile manufacturing. A new discovery, finds that the plastic fragments damage the marine environment, and the subject needs to be analysed in more detail than research has covered so far. This project aims to clarify which properties affect the amount of polyester fibre emissions when domestic washing. To investigate this, experimental tests were carried out on different material combinations washed under the same circumstances. Water from the wash was analysed and fibres were counted in order to complete a comparative study of polyester materials tend to shed. Three factors were considered for developing the method: development and improvement of existing method, aiming to resemble household wash and ensure reliability of results, all done by laboration washers instead of using commercial washing machines. Safety of results has been considerably affirmed during every step. Every polyester material was knitted, coloured and mechanically processed by the research group to guarantee that all of the materials was manufactured under same conditions. Different filter methods have been used to determine safety in results. Manufacturing of material, washing, filtering and analysis were the central focus for the practical work. The analysis came from manual count of every fibre particle. The result showed that microfiber yarn generally shed more than the filament yarn. A higher gauge gave more emission than a lower and that a worn material resulted in more shedding. The combination of these three factors; microfiber yarn, high gauge and a worn material gave markedly higher results than when tested with only two factors. The tests that only contained one of these factors gave significantly lower amount of emission. Fleece knitted in microfiber yarn had a lower level of shedding than a single jersey material in same yarn type with higher gauge. The method used for manufacturing is questioned, because the quality that should correspond an industrial produced fleece was not matched. Therefore, the result is critically inspected. The two combinations from the chosen parameters that gave the most respective and the least amount fibre emission were analysed additionally with more wash to assess their further effect. Here the emission seemed to increase with the amount of wash until it eventually subsided when more or less the fibres had worn away. Based on this result, one can finally say that these three factors should not be combined to manufacture knitted material in polyester.
Beckman, Maja. "Silver och vismut i plaster och färger : Källor till förhöjda halter i slam?" Thesis, Linnéuniversitetet, Institutionen för biologi och miljö (BOM), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-27927.
Texto completoKemiska ämnen sprids diffust och okontrollerat till följd av en ökad konsumtion av varor. REVAQ är ett certifieringssystem som arbetar för att minska flödet av farliga ämnen till svenska reningsverk och att skapa en hållbar återföring av växtnäring. Enligt REVAQ får inte den årliga ackumuleringshastigheten för metaller öka mer än 0,2 % i mark, vilket den gör för silver och vismut. Silverhalten i slam har de senaste årtionde minskat signifikant, men de senaste åren dock planat ut. Vismut har ökat avsevärt sedan 2005. Därför är det viktigt att identifiera källor till silver och vismut i slam. Syftet med denna studie har varit att utforska vilka typer av plaster och färger silver respektive vismut återfinns i samt att undersöka om dessa kan vara signifikanta källor till uppmätta halter av silver och vismut i slam. Resultatet av den substansflödesanalys som använts i denna studie visar att vismut används i ABS-plast, polyetenplast och troligen även i polyamidplast. Plasterna används främst i hushållsartiklar. Inflödet av plast till Stockholm beräknas innehålla 5 kg silver och 1,2 - 5,7 ton vismut och för färg 19 kg silver och 2,5 - 3,3 ton vismut. Stocken för plast i Stockholm beräknas innehålla 25 - 50 kg silver och 5,7 - 57 ton vismut och för färg 97 - 194 kg silver och 12 -33 ton vismut. Utflödet av metaller till Henriksdal reningsverk beräknas vara 300 g silver och 5- 25 kg för plast och 0,5 kg silver och 62 - 82 kg vismut för färg. Enligt denna studie är vismut i plast och färg en bidragande källa till uppmätta halter i slam (4,4 - 21 % respektive 54 - 73 % ). Silver i plast och färg är inte en bidragande källa till uppmätta mängder silver i reningsverkets slam.
Brysbaert, Ann N. "Technology and social agency in Bronze Age Aegean and Eastern Mediterraenean painted plaster". Thesis, University of Glasgow, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443389.
Texto completoNunes, João. "Fabrico de peças metálicas utilizando moldações cerâmicas e moldações em gesso". Master's thesis, Universidade do Porto, Faculdade de Engenharia, 1999. http://hdl.handle.net/10198/1856.
Texto completoAghajani, Farzaneh. "Additional Thermal Expansion Of Gypsum-Bonded Investment By Rapid Heating". Thesis, The University of Sydney, 1998. http://hdl.handle.net/2123/4842.
Texto completoRudatzki, Tina. "Untersuchungen zur Abbindeexpansion von verschiedenen Artikulationsgipsen bei unterschiedlicher Lagerung". Doctoral thesis, Universitätsbibliothek Leipzig, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-126242.
Texto completoDe, Milito Jose Antonio. "Avaliação do desempenho de aglomerante a base de gesso com cimento portland de alto forno e silica ativa". [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258270.
Texto completoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo
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Resumo
Resumo: O gesso é um aglomerante que tem sido muito empregado em revestimento de paredes. Apresenta um bom desempenho, é econômico e de fácil aplicação, mas limitado ao uso interno devido a sua sensibilidade à água. Algumas tentativas têm sido realizadas para melhorar a sua utilização em ambientes sujeitos à umidade. Neste sentido, pesquisas avançam na tentativa de empregar diferentes adições como resinas epóxi, polímeros, cimentos, escórias, impermeabilizantes, entre outros. O objetivo desta tese foi avaliar o desempenho das misturas de gesso com cimento Portland de Alto Forno e sílica ativa nos revestimentos internos e externos sujeitos à umidade. Para isso verificaram-se as propriedades macroscópicas das misturas por meio de ensaios físicos, químicos, físico-químicos e também a avaliação microestrutural utilizando a microscopia eletrônica de varredura. As misturas foram aplicadas em revestimentos de painéis de alvenaria de blocos de concreto e observados visualmente por um período de cinco anos. Além da observação visual foi verificada a resistência de aderência das misturas aplicadas internamente e externamente. Dos resultados obtidos observou-se uma possível coexistência entre o gesso e o cimento e que a adição de sílica ativa na mistura reduz a formação de etringita, principalmente nos revestimentos externos, sujeitos à umidade. A adição de cimento Portland melhora na abrasão e perda de massa, mesmo em idades mais avançadas. Assim, devido ao elevado custo de algumas adições, e as dificuldades de trabalhar com outros tipos de adição na obra, a adição de cimento Portland e sílica ativa ao gesso permitem uma melhoria de resistência, obtendo um revestimento de baixo custo e de fácil manuseio.
Abstract
Abstract: Plaster of Paris is a binding material being used in masonry as a plaster finish coat. Despite being economical, having good performance as and ease with wich it is applied in building, its use is limited to indoors. Some attempts has been made to improve its performance in external environment. In that sense, researches advance in the attempt at using several admixtures like epoxy resins, polymers, cements slags, waterproofing materials among other things. The objective of this thesis is to assess the performance of certain mixtures of rendering material containing plaster of Paris, slag cement and condensed silica fume when applied in the internal and external plaster finish coat. The macroscopic properties of the mixtures were analyzed through physical and chemical tests and also in SEM. Mixtures were applied on coatings of brick and mortar and visually inspected within five years. Bond strengths of the mixtures were measured, both in internal and external walls. Results showed compatibility between plaster of Paris and slag cement and that presence of condensed silica fume in the mixture reduced the formation of etringite, especially in the external coatings. The addition of Portland blastfurnace slag cement reduced the abrasion and the loss of mass, even in older ages. Therefore, due to the high cost of some admixtures, and the difficulty in working with other kinds of admixtures in the construction sites, the mentioned additions to the plaster rendering allow a mechanical strength improvement, thus resulting in low cost and good workability of the plaster finish coat.
Doutorado
Edificações
Doutor em Engenharia Civil
Trovão, Ana Paula Milagres. "Pasta de gesso com incorporação de resíduo de gesso e aditivo retardador de pega". Universidade Federal do Espírito Santo, 2012. http://repositorio.ufes.br/handle/10/6171.
Texto completoThe use of plaster in civil construction generates a large amount of waste, but it is a material that posses properties that makes it a highly competitive product. The main cause of the generation of this waste is the rapid hardening of the pastes. The incorporation of waste gypsum into the gypsum pastes results in an acceleration of the hardening process, which might increase the volume of residues generated. This dissertation aimed to develop procedure to incorporate the gypsum residue into plaster pastes without compromising the paste mechanical properties and, especially without accelerating its hardening process. Tests have been developed to evaluate the plaster pastes setting time, consistency, workability and temperature reading in the plaster pastes in the fresh state and evaluate the hardness and axial compressive strength in the hardened state. Tests results showed the viability of the incorporation of 5% gypsum waste in substitution of gypsum in the plaster paste when combined with borax retardant additive, which promoted extension of the workable time of the paste and an increase in the pastes mechanical properties
A utilização do gesso pela construção civil gera um grande volume de resíduos, no entanto é um material que apresenta propriedades que o torna altamente competitivo no mercado. A principal causa da geração desse resíduo é o rápido endurecimento das pastas. A incorporação de resíduo de gesso às pastas provoca a aceleração no processo de endurecimento, podendo aumentar ainda mais o volume de resíduos gerados. Essa dissertação teve como objetivo buscar a forma de incorporação do resíduo às pastas de gesso para revestimento de parede, sem comprometer suas propriedades mecânicas e principalmente não acelerar seu endurecimento. Foram realizados os ensaios de tempo de pega, consistência, consistência útil e leitura de temperatura nas pastas em seu estado fresco além dos ensaios de dureza e compressão axial destas no estado endurecido. Os ensaios apontaram a viabilidade da incorporação de 5% de resíduo de gesso em substituição do gesso quando associado ao aditivo retardador bórax, que promoveu ampliação do tempo de utilização da pasta e o aumento nas propriedades mecânicas ensaiadas
Alma, Sandqvist. "Byggbranschen måste också plastbanta : En fallstudie om plaster i dagens byggande och dess hälso- och miljöpåverkan". Thesis, Luleå tekniska universitet, Industriellt och hållbart byggande, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-73215.
Texto completoAndrews, Curtis Kyo-shin. "Validity and Reliability of Peer Assessment Rating Index Scores of Digital and Plaster Models". The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1208136018.
Texto completoWiles, Joanne. "An analysis of plaster sequences from the neolithic site of Catalhoyuk (turkey) by microspectroscopic techniques". Thesis, University of Reading, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501333.
Texto completoPlaster, Thomas [Verfasser]. "Management und Führung im Gesundheitswesen : Ein Arbeitsbuch für Ärzte und Angehörige der Gesundheitsberufe / Thomas Plaster". München : GRIN Verlag, 2010. http://d-nb.info/1186787686/34.
Texto completoCaner, Evin. "Archaeometrical Investigation Of Some Seljuk Plasters". Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1218858/index.pdf.
Texto completoAlanya Castle, Kubadabad Palaces, Syedra Archaeological Site, Aspendos Amphitheatre, Selinus Archaeological Site-Sekerhane Kö
sk and Hasbahç
e were examined. In a series of examination basic physical properties of the plasters as bulk density, porosity, water absorption capacity and water vapour permeability were obtained. The results indicated that plasters are low dense and high porous materials and having good breathing property. Mechanical properties of the plasters were expressed by the modulus of elasticity (Emod) values which were obtained from ultrasonic pulse velocity measurements. The Emod of the plasters being in the range of 1.0 to 5.6 Gpa show that they have enough mechanical strength comparable to historic mortars and bricks. Raw material composition and mineralogical properties of plasters were determined by combined interpretation of several types of analyses such as chemical analyses, particle size distribution of aggregates, petrographic analyses of thin sections by optical microscopy, scanning electron microscopic analyses of cross sections coupled with EDX for image analyses and semiquantitative elemental analyses, X-ray powder diffraction analyses for the determination of mineral phases, thermogravimetric analyses and FTIR analyses. Binder used in all plasters was found to be lime with amount in the range of 53.8-96.8% as CaCO3. The main minerals of aggregates are quartz, calcite (limestone), dolomite and opal-A. Regarding particle size distribution of aggregates it was possible to classify them into fine, coarse and mixed aggregates having rather high pozzolanicity. Study on decorative and red zigzag patterned plasters indicated presence of haematite as the source of red pigment. Study on green colored plaster also indicated presence of iron containing mineral with lower oxidation state. The Seljuk and Byzantine Masonries chosen are still surviving buildings that their plasters should be of good quality. In fact, this study approved their quality which may be due to the presence of opal-A and dolomite.
Ribeiro, Abrahão Severo. "Produção de gesso reciclado a partir de resíduos oriundos da construção civil". Universidade Federal da Paraíba, 2006. http://tede.biblioteca.ufpb.br:8080/handle/tede/5554.
Texto completoCoordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
Comparing to others binders, as Portland cement and lime, plaster is much more energetic efficient because it can be obtained at relatively low temperatures (less than 160oC). During its making process, it emits water vapor to atmosphere, instead CO2 produced by the others binders named above. Although, being a calcium sulfate that has some water solubility, irregular deposition of its residues can contaminate ground and natural source of water The resolution 307/02 of Brazilian National Environmental Council considers plaster as class C material, so, a material that generates residues for those technologies or feasible applications were not still developed to permit a recycling. Then, it is necessary to change this reality and to find a way to minimize plasters residues to environment. In this work, a possibility to obtain plaster from residues of four of its applications in civil construction (coating, sealing plates, decoration pieces, ceramic moulds) was investigated. Initially, the plaster residues volume generated at Recife Metropolitan Area was researched. After, physical, chemical and mechanical properties were obtained. X ray difractometry showed much alike between the recycled plasters and natural plaster. The same occurred with mechanical strength. Despite some small differences on others properties (as lower initial and final set time) results indicate that it is possible to recycle plaster residues. For this it is necessary to separate it of others construction materials residues in the construction site
Comparado com outros ligantes como cimento Portland e mesmo cal, o gesso apresenta muito maior eficiência energética, visto que pode ser obtido em temperaturas inferiores a 160°C. No seu processamento, ele lança na atmosfera vapor d´água, contrariamente aos dois primeiros produtos citados que emitem CO2 no seu processo de fabricação. No entanto, sendo um sulfato de cálcio que apresenta certa solubilidade em água, a deposição irregular de seus resíduos pode contaminar solos e águas. A resolução 307/02 do Conselho Nacional do Meio Ambiente considera o gesso como material classe C, ou seja, aquele que gera resíduos para os quais não foram desenvolvidas tecnologias ou aplicações economicamente viáveis que permitam uma reciclagem. Urge então reverter essa situação e encontrar formas de se minimizar a dispersão dos resíduos de gesso no meio ambiente. Uma delas é justamente promover o reaproveitamento desses resíduos. Neste trabalho foi estudada a possibilidade de obtenção do gesso a partir de resíduos de quatro de suas aplicações na construção civil: revestimento de alvenarias, placas de forro, peças de decoração, moldes para cerâmica. Inicialmente foi quantificado o volume de resíduos de gesso gerados na Região Metropolitana do Recife. Em seguida foram coletados os quatro citados tipos de resíduos. Estes materiais foram beneficiados em Laboratório e recalcinados. Em seguida foram feitos os ensaios de caracterização de suas propriedades químicas, físicas e mecânicas. Os resultados de difractometria de raios X mostraram muita semelhança entre os resíduos de gesso e a gipsita. O mesmo ocorre com as resistências mecânicas. Apesar de algumas diferenças em outras propriedades (como tempos de inicio e fim de pega) os resultados deste trabalho apontam para a possibilidade de se obter gesso a partir dos resíduos gerados na indústria da construção civil,xviii devendo-se ter o cuidado de separar nas obras esse material de contaminações com outros resíduos de construção.
Sharek, Elizabeth. "The unsettled object". Click here to access this resource online, 2007. http://hdl.handle.net/10292/421.
Texto completoSvensson, Sellin Viveca. "Kemikalier i livsmedelsförpackningar och dess påverkan på människors hälsa : En studie om migrering av kemikalier från produkter och livsmedelsförpackningar till livsmedel". Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-73065.
Texto completoARRUDA, Gerlânia Brasiliana de. "Rotas geoquímicas da contaminação sulfática em meios aquosos no município de Araripina/PE". Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/17895.
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Propriedades físico-químicas de águas superficiais represadas (profundidade: 30 cm) da região de Araripina, envolvendo pH, condutividade, OD, STD, temperatura, sulfatos, cloretos e bicarbonatos, são apresentadas neste trabalho. Este estudo foi motivado por pesquisas médicas que indicaram a poeira de gesso como responsável por 38% das internações hospitalares locais. A amostragem, no final da estação chuvosa, pressupõe um máximo de lixiviação da poeira de gesso sedimentada em solos e vegetação. A partir de focos produtores, os resultados permitiram configurar halos hidroquímicos de contaminação originados pela lixiviação da poeira de gesso e por efluentes da produção de placas de gesso. Posteriormente esses dados foram comparados com amostragem com período de estiagem. Estes halos envolvem centenas de metros de extensão, com período de estiagem orientado predominante dos ventos, determinando áreas de influência onde águas represadas e de subsuperfície estão contaminadas em SO4— (>250 mg/L até 1930 mg/L) e em cloretos (>250 mg/L até 5390 mg/L). Esta associação hidroquímica é atribuída à lixiviação de particulados de gesso e à provável presença de halita residual neste produto. A drenagem a jusante de Araripina revela contaminações por efluentes da produção de placas de gesso no domínio urbano, com contribuição adicional de efluentes domésticos sódicos e/ou clorados. No interior dos halos de dispersão de poeira/efluentes de gesso, águas represadas com concentrações elevadas em cloretos (> 200 mg/L) e sulfatos (> 250 mg/L), estão inviáveis para consumo humano. Elevadas taxas de dissolução e de residência de sulfatos e cloretos, nestes meios líquidos, mostraram aumento de concentração sulfatos e cloretos nos corpos d'água estudados principalmente no quadro de estiagem prolongada.
Physicochemical properties of dammed surface water (depth: 30 cm) of Araripina region, involving pH, conductivity, DO, TDS, temperature, sulfates, chlorides and bicarbonates, are presented in this paper. This study was motivated by medical research that indicated the dust plaster responsible for 38% of local hospitalizations. Sampling at the end of the rainy season, it assumes a maximum of dust leaching gypsum sediment in soils and vegetation. From producers outbreaks, the results helped set hydro chemical halos of contamination arising from the leaching of plaster dust and waste from the production of plasterboard. Subsequently these data were compared with a sample with the dry season. These halos involve hundreds of meters long, with prevailing dry season winds oriented, determining areas of influence where backwaters and subsurface are contaminated in SO4- (> 250 mg / L to 1930 mg / L) and chlorides (> 250 mg / L to 5390 mg / L). Hydrochemistry This association is attributed to leaching of gypsum particles and the probable presence of residual halite this product. Draining the Araripina downstream reveals contamination by waste from the production of plasterboard in the urban area, with additional contribution of sodium and / or chlorinated domestic sewage. Inside the dispersion halos of dust / waste gypsum, water dammed chlorides in high concentrations (> 200 mg / l) and sulphate (> 250 mg / L), are unfeasible for human consumption. High dissolution rates and residence of sulphates and chlorides, these liquid media showed increased concentration sulfates and chlorides in water bodies studied mainly in prolonged drought frame.
Meyers, Julia Isabell. "Prehistoric Wall Decoration in the American Southwest: A Behavioral Approach". Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/194060.
Texto completoMorse, Evan. "Objectified : a sculptural study /". Norton, Mass. : Wheaton College, 2009. http://hdl.handle.net/10090/8397.
Texto completoGráf, Radomír. "Návrh technologie výroby plastového programového kotouče". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230863.
Texto completoSmith, D. Charles. "The impact of the Deir ʻAlla plaster text on the biblical interpretation of Balaam and his oracles". Theological Research Exchange Network (TREN), 1999. http://www.tren.com.
Texto completoCalisesi, Matteo. "Aerogel Incorporated Plasters and Mortars: the case study of precast panels". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13043/.
Texto completoRajchot, Václav. "Vývoj tepelně izolačních a sanačních omítek pro památkovou péči". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225894.
Texto completoCiftci, Burcu Devrim. "Archaeometrical Studies On Plasters Of Some Historical Buildings". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608261/index.pdf.
Texto completochemical analyses, optical observation of cross sections, petrographic analyses of thin sections, elemental analyses by ICP-OES, X-ray powder diffraction analyses for the determination of mineral phases, thermogravimetric analyses and FTIR analyses were carried out. Interpretation of all the analytical examination was used to understand the composition and unique character of plaster samples studied. Observation of thin sections revealed more plaster layers than those observed in cross sections. Up to twelve layers could be observed with different colours, such as blue, red, yellow, green, white and brown. Generally, thicknesses of white plaster layers were found to be thicker than the others. In two samples, two black boundaries between plaster layers were identified which could be an indication of the use of asphalt for isolation purposes, like dampness proofing or heat insulation. Soluble salt contents of the plaster samples were in the range 3.04%-9.22%, with an average being 6.62%. The anions identified were Cl-, SO42-. In few samples, PO43-, NO2- and NO3- were found. Binder was found to be lime and gypsum. The amount of binder in terms of total calcium oxide, CaO, was found to be in the range of 33.5-43.6%, with an average being 37.9%. Amount of aggregate was about 62.1% as average. The main minerals identified in plaster samples were calcite and gypsum. Gypsum might be added to increase the strength of the plaster. Beside calcite and gypsum, quartz and pozzolanic activity related mineral, Opal-A, were found in some of the samples. In red plaster layers hematite mineral was also identified. Other colour effective elements were found to be Fe, Sb, Mn, Cu, Cr and Ni. Presence of organic additives was observed but clear identification was not established.
Renso, Michele <1993>. "Analysis of the effectiveness of inhibitors of crystallization of soluble salts and consolidation of plaster in marine environment". Master's Degree Thesis, Università Ca' Foscari Venezia, 2022. http://hdl.handle.net/10579/21370.
Texto completoCavalcanti, Leonardo Barbosa. "Determinação de condições operacionais adequadas na desidratação do minério de gipsita para obtenção de um gesso beta reciclável". Universidade Católica de Pernambuco, 2006. http://www.unicap.br/tede//tde_busca/arquivo.php?codArquivo=25.
Texto completoOperational conditions of temperature and pressure had been determined under which the thermal dehydration of the gypsum ore occurs producing a type of recyclable beta plaster. With the resolution of the CONAMA n 307, of July 5th of 2002, the plaster waste proceeding from the civil building became one waste of difficult discarding, a time that this material is considered such as contaminante for the excessively component ones of a rubbish and considers that technology for its recycling still was not developed. In this work it was elaborated and confectioned a batch reactor in laboratory scale for beta plaster production from the ore gypsum and under pressure above of the atmospheric pressure. This excess of pressure was gotten holding back part of the water vapor produced with the dehydration of the ore, by means of a valve of the automatic relief type. The dehydration of the gypsum ore in these conditions gives origin to a beta plaster with superior mechanical characteristics to the plaster conventionally produced by the majority of the existing productive processes in the Polar Region Plasterer of the Araripe - Pernambuco. Under controlled pressure of 0.65 atm above of the atmospheric pressure and approximately 150 C, the plaster does not present breaked crystals, provoked for the abrupt exit of the dehydration water of the calcium sulphate di-hydrate. Some important properties of the beta plaster, produced under pressure had been tested and compared with plaster produced under conventional conditions of manufacture. The tests had verified values of the dehydration water, to confirm the final conversion of the dehydration reaction, and properties as unitary mass, flexion rupture modulus, hardness and setting time. The beta plasters produced under pressure had been tested in two life cycles and in both they had presented characteristics of a plaster with well formed crystals, homogeneously distributed and of low inter- and intra-crystals porosities. Its comparison with conventional plasters had shown superiority how much to the mechanical properties, mainly in relation to both in its second life cycles. The recycling index was of 100 %. So is given credit that the industrial productive processes practiced in the Polar Region Plasterer need technique adaptations, if it desires to the recycling of part of plasters originated in building and demolition, such as waste of the plates, blocks, plaster walls, and so on, and the wastes also originated in the proper processes of manufacture of these plaster premoldeds
Ebadi, Arshia. "Communal Hall in Hackney Wick". Thesis, KTH, Arkitektur, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96948.
Texto completoGuducu, Gulnur. "Archaeometrical Investigation Of Mud Plasters On Hittite Buildings In Sapinuwa-corum". Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/1260751/index.pdf.
Texto completoBrückner, Julian Karl. "Adhäsionskräfte von Artikulationsgipsen an Typ 3 und 4 Modellgips. Eine in vitro Studie". Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-168928.
Texto completoZhu, Libing y 朱麗冰. "Tianjiu therapy for patients with chronic asthma : an evaluation of efficacy and exploration of the optimal treatment duration". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/206740.
Texto completopublished_or_final_version
Chinese Medicine
Master
Master of Philosophy
Elmubarak, Mona Dr. "Accuracy and reliability of traditional measurement techniques for tooth widths and arch perimeter compared to CAD/CAM". The University of the Western Cpae, 2018. http://hdl.handle.net/11394/6472.
Texto completoBACKGROUND: Plaster models form an integral part of the traditional orthodontic records. They are necessary for diagnosis and treatment planning, case presentations as well as for the evaluation of treatment progress. The accuracy of the measurements taken for space assessment is crucial prior to treatment planning. The introduction of digital models overcomes some problems experienced with plaster models. Digital models have shown to be an acceptable alternative for plaster models. AIM: The aim of the study was to determine the accuracy of traditional measurement techniques when compared to the CAD/ CAM measurements in the assessment of tooth widths and arch perimeter from plaster models. METHOD: The mesio-distal tooth widths and arch perimeter of thirty archived plaster models were measured using a digital caliper to the nearest 0.01 mm and divider to the nearest 0.1 mm. Corresponding digital models were produced by scanning them with a CAD/CAM (InEos X5) and space analysis completed by measurements using InEos Blue software. Measurements were repeated after 1 week from the initial measurement. The methods were compared using descriptive analysis (mean difference and standard deviation). RESULTS: The operator reliability was high for digital models as well as the plaster models when the measurement tool was the digital caliper (analyzed using the Pearson correlation coefficient in the paired t-test). The mean values of tooth widths measurements of CAD/CAM, digital caliper and divider were 6.82 (±0.04), 6.94 (± 0.04) and 7.11 (± 0.04). There was a significant difference between the measurements made by the CAD/CAM and the divider. Additionally significant differences between the measurements by digital caliper and divider measurements (p < 0.05) were observed. No significant difference was found when comparing CAD/CAM to digital caliper. Positive correlation was displayed between CAD/CAM, digital caliper and the divider, but the measurements completed with the digital caliper had the highest correlation with the CAD/CAM. The difference was not significant between the aforementioned measurement tools (p > 0.05). Arch perimeter measurements showed no statistical significant difference between CAD/CAM, digital caliper and divider (p < 0.05). CONCLUSION: Archived plaster models stored as records can be converted to digital models as it will have the same accuracy of measurements. The value of doing a space analysis with the CAD/CAM system can be performed with similar reliability on the digital models as a caliper on plaster models.
Madhoo, Amika. "A comparison of three types of orthodontic study models". University of the Western Cape, 2020. http://hdl.handle.net/11394/8126.
Texto completoThe aim of this present study was to compare the accuracy of digital and printed study models with plaster study models, that are considered the gold standard. The objectives were to compare the accuracy of measurements obtained from digital and printed study models with those of plaster study models, to establish which type of study model yielded the most accurate measurements in comparison to plaster study models and to identify possible disadvantages and errors that can be made using any of the three types of study models.
Krejčík, Jakub. "Analýza metod hodnocení špinivosti ETICS". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392328.
Texto completoSchaub, Henning. "Comparison of different aluminium casting processes from an environmental perspective : Case study on plaster mould castings produced in Mid Sweden". Thesis, Mittuniversitetet, Avdelningen för ekoteknik och hållbart byggande, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-35659.
Texto completo2018-10-10