Дисертації з теми "SBBs"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "SBBs".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Sjövall, Sigstedt Anita, and Philip Turner. "Svenskt barnbildarkiv (SBBA) : Barnbilder, bildindexering och digitalisering." Thesis, Högskolan i Borås, Institutionen Biblioteks- och informationsvetenskap / Bibliotekshögskolan, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-20499.
Повний текст джерелаProgram: Bibliotekarie
Albarici, Fabio Luiz. "Posicionamento relativo: análise dos resultados combinando as observáveis L1 dos satélites GPS e SBAS." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3138/tde-01062011-135146/.
Повний текст джерелаThe augmentation systems, known as SBAS (Satellite-Based Augmentation System) provide information for completeness and accuracy in real time to its users, using the differential corrections that are transmitted by geostationary satellites. They are available in specific regions of the globe such as USA, Canada and Europe. Outside their region of coverage the system still does not provide the correction data in real time. However, the signal is transmitted at the same frequency L1 GPS, which is available here in Brazil, and some GNSS receivers have specific frequency channels that capture this signal, with the prospect that the data from these satellites improve the conditions of screening, besides improving the accuracy of the coordinates. With this assumption, we used the observed phase of the carrier wave (L1) to infer its contribution to the placement. The surveys were conducted in various locations due to rising SBAS satellites vary with latitude and longitude. However, this study was directed to the data from the WAAS satellites (PRN 138) and EGNOS (PRN 120 and 124) because they were the only visible throughout the screening taking simultaneity between the base and mobile receivers. During the processing stage, which was used the software GNSS Solution, some experiments were performed, such as: 1) Processing with all the L1 observable from available satellites (GPS and SBAS), analysis of standard deviations and comparison of the coordinates obtained with the true, 2) processing without observable L1 SBAS satellites, analysis and comparisons, 3) gradual withdrawal of the GPS satellites and reprocessing together (GPS + SBAS) and separately (GPS only). The main purpose of these experiments was to investigate the potential of the L1 observable processed SBAS satellites together with GPS L1 observable in the relative positioning. Statistical analysis such as trending and root mean square (RMS) were applied to verify the existence of systematic errors and accuracy of these coordinates. The results show that, specifically at sites of screening, the observables L1 SBAS satellites to be added to the processing, combined with the L1 observable GPS satellites, are not decisive for improving the accuracy of the coordinates.
Wong, Chi Chown. "Function of the SBDS gene in Dictyostelium discoideum." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611479.
Повний текст джерелаGuay, Jean-Christophe. "Récepteur SBAS-GNSS logiciel pour des applications temps-réel." Mémoire, École de technologie supérieure, 2010. http://espace.etsmtl.ca/642/1/GUAY_Jean%2DChristophe.pdf.
Повний текст джерелаKinns, H. J. "Mapping the molecular structure of the S-layer protein SbsB." Thesis, University College London (University of London), 2010. http://discovery.ucl.ac.uk/19488/.
Повний текст джерелаLudäscher, Nadine Liechti Charles. "Pauschalstädtereisen versus Individualstädtereisen : am Beispiel SBB Reisebüro /." Bern : [s.n.], 2006. http://www.wirtschaft.bfh.ch/uploads/tx_frppublikationen/liecchar.pdf.
Повний текст джерелаNogueira, Helton Pereira 1986. "Compósitos baseados em grafite/grafite reconstituído e elastômero SBS." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/248755.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Química
Made available in DSpace on 2018-09-27T12:42:23Z (GMT). No. of bitstreams: 1 Nogueira_HeltonPereira_M.pdf: 2762504 bytes, checksum: 2a6c093233b2870f10da6a8408841655 (MD5) Previous issue date: 2012
Resumo: As cargas de carbono, tais como grafite, nanotubos de carbono, fulerenos e mais recentemente o grafite tem atraído a atenção de inúmeros pesquisadores, que buscam formas de aproveitar suas excepcionais propriedades elétricas no desenvolvimento de compósitos com potenciais aplicações nas áreas de sensores eletroquímicos, células solares, barreira eletromagnética entre outras. Neste trabalho teve-se como objetivo o desenvolvimento de compósitos baseados em poli(estireno-co-butadieno-co-estireno) ¿ SBS e as cargas de carbono, grafite e grafite. Para tanto, o grafite foi obtido pela oxidação do grafite empregando-se a metodologia de Hummers, seguida de redução por hidrazina. Os compósitos de grafite e "grafite¿ foram preparados por mistura mecânica e por casting de soluções em diferentes solventes na faixa de composição de 0,5 a 10 % em massa de carga. O processamento mecânico resultou em compósitos que apresentaram comportamento mecânico dependente do tipo e quantidade de carga. Porém, esses compósitos apresentaram-se como isolantes elétricos devido a não formação de uma rede de percolação. A matriz de SBS nos compósitos obtidos por casting apresentou morfologia dependente do solvente empregado, o que se deve aos parâmetros de solubilidade dos solventes e dos blocos de poliestireno e polibutadieno do SBS, e a dispersão da carga pela matriz foi mais uniforme do que no caso de compósitos preparados por mistura mecânica, promovendo uma melhora nas propriedades mecânicas e conferindo propriedades de condução elétrica
Abstract: Carbon fillers such as graphite, carbon nanotubes, fullerenes and currently graphene have attracted the attention of many researchers, due to their exceptional and useful electrical properties for the development of composites with potential applications in electrochemical sensors, solar cells, electromagnetic barrier, and so on. The objective of the herewith work is the development of composites made up of poly(styrene-co-butadiene-co-styrene) ¿ SBS and carbon fillers (graphite or graphene). The graphene was obtained by oxidation of the graphite by the Hummers¿ method, followed by hydrazine¿s reduction. The graphite and graphene - based composites were prepared by melt compounding and by solvent casting using different organic solvents in a composition range of 0,5 to 10% in weight of filler. The results showed that the melt compounding produced composites with mechanical properties dependent on the type and amount of filler. Also, these composites behave as electrical insulators due to the absence of percolation thresholds. The morphology of SBS matrix in the composites obtained by solvent casting is determined by the organic solvent, more specifically by the interaction paramenter of solvent and of the polybutadiene and polystyrene blocks of the SBS. The filler dispersion throughout the matrix in the composites obtained by solvent-casting was more uniform than the dispersion level in the composites obtained by melt compounding. Therefore, the first materials showed higher mechanical performance and electrical conducting
Mestrado
Físico-Química
Mestre em Química
Maharajh, Nirupa. "Effect of Feed Rate and Solid Retention Time (SRT) on Effluent Quality and Sludge Characteristics in Activated Sludge Systems Using Sequencing Batch Reactors." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/36107.
Повний текст джерелаMaster of Science
Contreras, Exequiel, Trond Karlsen, and Juan Fco Urmeneta. "Plan de Negocios para la Empresa "SBS Consulting"." Tesis, Universidad de Chile, 2005. http://www.repositorio.uchile.cl/handle/2250/114372.
Повний текст джерелаNo disponible a texto completo
La compañía “SBS Consulting” (SBS = “Social Balance Solutions” en inglés y “Soluciones Balance Social” en castellano) será una empresa consultora especializada en gestión de personas, ubicada en Santiago de Chile. La Compañía proveerá servicios especializados de medición del nivel de compromiso, grado de motivación, satisfacción y actitudes de los empleados respecto de la empresa en que trabajan. La compañía también proveerá asesoría de análisis de los resultados de los servicios de medición que realice y asesoría en la implementación de mejoras. Este servicio de medición será entregado en forma periódica, de tal forma que los efectos de las mejoras que se implementen y otros cambios sociales sean detectados oportuna y adecuadamente. La técnica de medición estará basada en una metodología simple y única desarrollada y perfeccionada por el Sr. Juan Fco. Urmeneta a través de su trabajo como gerente de Recursos Humanos en la Asociación Chilena de Seguridad (ACHS) con una dotación de 3.600 trabajadores aproximadamente distribuidas en todas las regiones del país. ACHS es la principal mutualidad privada del país, administradora del seguro contra accidentes del trabajo y enfermedades profesionales, que entrega servicios de prevención de riesgos, salud ocupacional preventiva y curativa y pago de las prestaciones económicas a los trabajadores, que sufren un infortunio laboral. La empresa “SBS Consulting” cooperará con ACHS y ofrecerá sus servicios a las empresas asociadas de tamaño mediano y grande. La empresa “SBS Consulting” al disponer dentro de sus fundadores al Sr. Urmeneta, aprovechará en forma importante su experiencia adquirida durante más de 20 años administrando el Balance Social en una gran empresa con sucursales a lo largo de todo el país. La metodología ha sido denominada “Balance Social” y ha demostrado disponer de una gran eficiencia para ayudar en el aumento de la productividad de las personas, ahorro de costos asociados a la gestión de personas (Ej. Compensaciones y Entrenamiento, entre otros) disminución de costos de reclutamiento, retención de empleados claves, como también mejoras sustanciales en el nivel de reputación de las empresas, dónde esta metodología se ha aplicado, en forma profesional, con el apoyo decidido de la alta dirección de las mismas. ACHS ha sido reconocida dentro de las 25 mejores empresas para trabajar en Chile, en 3 oportunidades en los últimos 4 años y como la empresa N° 1 de las empresas calificadas dentro del ranking el mejor lugar de trabajo para las mujeres, el 2003 y la N° 3 el 2004. El activo uso de la metodología aportada por el Balance Social por la administración de la ACHS, se estima que ha sido la causa fundamental que le ha permitido lograr estas prestigiosas distinciones, entre otras, y alcanzar la más alta productividad del sistema mutual en forma reiterada. Esta metodología ha sido implementada en dos empresas clientes de la ACHS, cinco han solicitado el servicio y varias otras (más de veinte) han hecho ver su interés en recibir este servicio. En consecuencia, existe un mercado potencial más que razonable para crear una empresa que otorgue el servicio de confección del Balance Social.
Markotsis, Martin G. School of Chemical Engineering & Industrial Chemistry UNSW. "Morphological studies of sbs based interpenetrating polymer networks." Awarded by:University of New South Wales. School of Chemical Engineering and Industrial Chemistry, 2005. http://handle.unsw.edu.au/1959.4/32833.
Повний текст джерелаMachado, Ronaldo Zamiro. "Asfalto modificado com polimero SBS para pavimentos drenantes." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267009.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica
Made available in DSpace on 2018-08-09T04:13:32Z (GMT). No. of bitstreams: 1 Machado_RonaldoZamiro_M.pdf: 3142137 bytes, checksum: c09c35641979a8788df1ed3a99eb5bdd (MD5) Previous issue date: 2007
Resumo: O polímero SBS - Estireno-Butadieno-Estireno tem sido muito empregado para modificar o asfalto, tanto para pavimentação como para aplicações industrial. Nessa pesquisa foi abordado o estudo do asfalto modificado com polímeros SBS, apresentando comportamento melhor que asfalto convencional, mostrando-se como o polímero se comporta ao ser misturado com o asfalto e quais características são melhoradas. O asfalto modificado com polímero SBS tem uma vida útil muito superior ao asfalto convencional, ressaltando os pavimentos drenantes, que pelos seus vazios por onde escoam a água oferece maior segurança, durabilidade, conforto, menos custos com manutenção, tempo ganho com viagens mais rápidas, menos estresse, vidas poupadas, e com tudo isso, alertar as autoridades governamentais e concessionárias de rodovias que é necessário investirem mais com esses materiais de melhor qualidade, visto que na Europa e Estados Unidos já se apiicam muito o asfalto modificado com SBS. Porém foi verificado também que nem todos os trechos das rodovias podem ser usados os pavimentos drenantes e quais os pavimentos então que devem ser usados nesses trechos. Foi feito também um comparativo entre custos e benefícios de asfaltos modificados com polímero e asfaltos convencionais
Abstract: The polymer SBS - Styrene-Butadiene-Styrene has been very employed to modify the asphalt, for paving and for industrial applications. In that research the study of the asphalt was approached modified with polymer SBS, presenting better behavior than I asphalt conventional, being shown as the polymeric behaves when being mixed with the asphalt and which characteristics are gotten better. The asphalt modified with polymeric SBS it has an useful life very superior to the conventional asphalt, pointing out the drain pavements, that for your emptiness through where it drains the water it offers larger safety, durability, comfort, less costs with maintenance, time branch with trips faster, less stress, saved lives, and with all this to alert the government authorities and concessionary of highways that it is necessary to invest more with those materials of better quality, because in Europe and United States it is already applied a lot the asphalt modified with SBS. However it was also verified that nor all spaces of the highways can be used the drain pavements and which the pavements then that should be used in those spaces. It was also made a comparative one between costs and benefits of asphalts modified with polymeric and conventional asphalts
Mestrado
Ciencia e Tecnologia de Materiais
Mestre em Engenharia Química
Minčík, Igor. "Problematika zavedení IFR provozu na malá letiště v ČR." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232112.
Повний текст джерелаCarini, Diane. "Treatment of industrial wastewater using chemical-biological sequencing batch biofilm reactor (SBBR) processes /." [S.l.] : [s.n.], 1999. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13431.
Повний текст джерелаHalldén, Tom Halldén. "Measuring coastal erosion along the coast of Ystad municipality using PSInSAR and SBAS." Thesis, Stockholms universitet, Institutionen för naturgeografi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-141076.
Повний текст джерелаAbreu, Flávia Oliveira Monteiro da Silva. "Blendas de polipropileno com elastômeros termoplásticos tipo SBS e SEBS." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2004. http://hdl.handle.net/10183/4517.
Повний текст джерелаLucena, Maria. "Caracterização química e reológica de asfaltos modificados por polímeros." reponame:Repositório Institucional da UFC, 2005. http://www.repositorio.ufc.br/handle/riufc/2080.
Повний текст джерелаSubmitted by irlana araujo (irlanaaraujo@gmail.com) on 2011-12-29T16:12:26Z No. of bitstreams: 1 2005_tes_Mar_Lucena.pdf: 2143974 bytes, checksum: 430ccc92a6f0987f217156dd1885e893 (MD5)
Approved for entry into archive by Aline Nascimento(vieiraaline@yahoo.com.br) on 2012-02-14T14:54:11Z (GMT) No. of bitstreams: 1 2005_tes_Mar_Lucena.pdf: 2143974 bytes, checksum: 430ccc92a6f0987f217156dd1885e893 (MD5)
Made available in DSpace on 2012-02-14T14:54:11Z (GMT). No. of bitstreams: 1 2005_tes_Mar_Lucena.pdf: 2143974 bytes, checksum: 430ccc92a6f0987f217156dd1885e893 (MD5) Previous issue date: 2005-05-23
Neste trabalho foi realizado o estudo da caracterização quimica e reologica do cimento asfaltico produzido recentemente no pais, oriundo de petroleo do Campo Fazenda Alegre, no estado do Espirito Santo. Para efeito de comparação, tambem foram estudados os asfaltos da refinaria Vale do Paraiba e os estrangeiros arabe e venezuelano. Os asfaltos foram modificados por incorporação dos polimeros SBS e EVA, e os efeitos resultantes da modificação foram avaliados. Os parâmetros investigados visaram a avaliação de problemas usuais como: deformação permanente, trincas termicas e oxidação. Os polimeros foram caracterizados atraves de termogravimetria e calorimetria exloratoria diferencial e por espectroscopia no infravermelho. Os asfaltos puros e modificados foram caracterizados por espectroscopia no infravermelho, ressonância magnetica nuclear, calorimetria exploratoria diferencial, termogravimetria e cromatografia de permeação em gel. A composição quimica foi realizada atraves do fracionamento SARA e teor de enxofre. Ensaios empiricos como ponto d amolecimento, penetração e retorno elastico tambem foram realizados. As propriedades reologicas foram avaliadas através da viscosidade absoluta e de ensaios dinâmico-mecânicos. O envelhecimento oxidativo dos asfaltos foi avaliado a partir da analise dos espectros no infravermelho e de ressonância magnética nuclear, alem da variação do modulo complexo de cisalhamento dinâmico. Observou-se que os asfaltos brasileiros diferem em relação aos teores de carbonos aromáticos, quando comparados com o asfalto árabe. Alem disso, apresentam comportamento diversos frente à presença de oxigênio. Nos asfaltos modificados pos SBS, o ensaio de calorimetria exploratória diferencial mostrou uma diminuição na transição vítrea do material. A presença do SBS aumentou a resistência do asfalto ao processo oxidativo. A adição do SBS e do EVA provocou um aumento da viscosidade do asfalto de forma não linear indicando que os polímeros não são aditivos inertes. O comportamento Newtoniano não foi verificado para os ligantes modificados. Ensaios dinâmicos-mecânicos demonstraram que o SBS elevou o grau de desempenho dos ligantes. Os ensaios com as aparas da industria de calçados (EVA), indicaram uma melhoria na elasticidade do ligante.
Villi, Filippo. "Analisi dei fenomeni franosi lenti nell'abitato di Gaggio Montano mediante interferometria radar." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10134/.
Повний текст джерелаKazasi, Anna. "Evaluation of gasoline-denatured ethanol as a carbon source for wastewater denitrification." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/76940.
Повний текст джерелаMaster of Science
Kvíčala, Aleš. "Možnosti zvyšování výkonnosti GNSS pro zajištění provozu RNP-RNAV." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227982.
Повний текст джерелаSandsjö, Agnes, and Emelie Wiklund. "Sustainable Business Models in Start-ups : The process of creating and implementing SBMs successfully." Thesis, Umeå universitet, Företagsekonomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172728.
Повний текст джерелаLucena, Maria da ConceiÃÃo Cavalcante. "Chemical and rheological characterization of an asphalt cement(AC)modified polymers." Universidade Federal do CearÃ, 2005. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1417.
Повний текст джерелаThis work presents a study on chemical and rheological characterization of an asphalt cement (AC) recently produced in Brazil, originated of petroleum of the field of Fazenda Alegre at the state of EspÃrito Sa nto. A second Brazilian petroleum and also a foreign one were also studied, and their respective asphalts were compared to the Fazenda Alegre AC. The effect of polymers such as SBS and EVA on the chemical and rheological behavior of the investigated ACs was also object of the study. Typical pavement distresses were considered, such as permanent deformation, thermal cracking and oxidation. The polymers were examined using therm ogravimetry and differential scanning calorimetry and also infrared spectroscopy. Base and modi fied asphalt cements were characterized by infrared spectroscopy, nucl ear magnetic resonance, thermogravimetry, differential scanning calori metry and gel permeation chromatography. The chemical composition was found by the SARA method a nd the sulfur amount. Empirical tests such as softening point, penetration and elastic recovery were also performed. Rheological properties were determined by the absolute viscosity and dynamic mechanical analyses. The oxidative aging of asphalts was analyzed by the infrared and nuclear magnetic resonance as well by the variati on of complex shear modulus. The observed structural characteristics show ed that the Brazilian asphalt has a different structure when compared to foreign asphalts, evidenced by a different amount of aromatic carbon. In addition, the asphalts showed different beha vior when exposed to oxidative conditions. The differential scanning calorimetry results showed a decrease in glass transition temperatures in the polymer modi fied asphalts. The effect of SBS and EVA were also observed in the viscosity measurem ents. An increase in the absolute viscosity and a Non-Newtonian behavior was observe d. Therefore, polymers acted as non-inert additives. Dynamic mechanical analyses demonstrated that SBS increases the binder performance grade. The analyses performed in the asphalts modified by the residue of sandalâs industry showed an improvement in elasticity.
Sahlberg, Bo. "Indoor Environment in Dwellings and Sick Building Syndrome (SBS) : Longitudinal Studies." Doctoral thesis, Uppsala universitet, Arbets- och miljömedicin, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-172769.
Повний текст джерелаFernández, Villalba Omar A., and Salinas Edgardo G. Cáceres. "Evaluación del comportamiento mecánico de mezclas SMA y Superpave empleando asfalto modificado con Polímero SBS (Estireno-Butadieno-Estireno)." Bachelor's thesis, Universidad Ricardo Palma. Programa Cybertesis PERÚ, 2007. http://cybertesis.urp.edu.pe/urp/2007/fernandez_oa/html/index-frames.html.
Повний текст джерелаWong, Tsun Wah. "A study on mechanical properties of high density polyethylene/polystyrene/SBES [i.e. SEBS] polymer blends." access abstract and table of contents access full-text, 2001. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21175202a.pdf.
Повний текст джерела"A dissertation submitted in part-fulfilment of the requirements for the degree of Master of Science of City University of Hong Kong." Title from title screen (viewed on Sept. 4, 2006) Includes bibliographical references.
Käsermann, Philip. "Die Zitate in den ICN-Neigezügen der SBB - Ein Stück Schweizer Literaturgeschichte? /." [Biel] : [Selbstverlag], 2004. http://www.dgb.ch/unterricht/maturaarbeiten/KaesermannPhilip/MAphilip.PDF.
Повний текст джерелаCarlesso, Gabriela Ceccon. "Estudo do comportamento de mistura asfáltica modificada por nanoargila e polímero SBS." reponame:Repositório Institucional da UFSC, 2017. https://repositorio.ufsc.br/xmlui/handle/123456789/178976.
Повний текст джерелаMade available in DSpace on 2017-09-05T04:11:25Z (GMT). No. of bitstreams: 1 348640.pdf: 3011288 bytes, checksum: f1802c74bd985f140e8a1740bd7ef936 (MD5) Previous issue date: 2017
No Brasil, o desenvolvimento e o estudo de misturas asfálticas de alto desempenho são justificados em virtude do elevado contingente de defeitos precoces identificados nas rodovias, que contrastam com a notável importância do meio de transporte rodoviário para o País. A partir deste contexto, este trabalho tem como objetivo a avaliação do comportamento reológico e a previsão de desempenho de uma mistura asfáltica modificada simultaneamente por nanoargila e por polímero SBS. Com esta finalidade, foi adaptado um procedimento de laboratório para a modificação de um ligante asfáltico convencional, por meio do qual a nanoargila e o polímero foram incorporados à matriz asfáltica em teores de 3% e de 2%, respectivamente. Posteriormente, a mistura produzida com o ligante modificado (3% NA + 2% SBS) foi investigada em relação à dosagem, à ação deletéria da água, à deformação permanente, ao módulo e à fadiga (aparato 4 pontos) e a simulações numéricas de estruturas de pavimentos. Os resultados foram comparados àqueles obtidos por Melo (2014) e por Marcon (2016), que avaliaram misturas asfálticas análogas, porém produzidas com ligante convencional (CAP 50-70), modificado somente por nanoargila (3% NA) e somente por SBS (SBS 60/85). Como resultado, o estudo de dosagem indicou um teor de ligante de projeto equivalente ao obtido para a mistura produzida com CAP 50-70 e intermediário se comparado àqueles obtidos para as misturas 3% NA e SBS 60/85. Na avaliação do efeito da ação deletéria da água e do fenômeno de deformação permanente, a mistura 3% NA+ 2% SBS mostrou-se superior às demais. No estudo reológico, apresentou módulos complexos relativamente elevados e os menores valores de ângulo de fase. Os resultados dos ensaios de resistência à fadiga, entretanto, mostraram o comportamento superior da mistura SBS 60/85, seguido pelo comportamento das misturas 3% NA+ 2% SBS, 3% NA e convencional. Contudo, com base nas simulações numéricas, evidenciou-se que a substituição de revestimentos com as misturas convencional, 3% NA e SBS 60/85 por revestimentos com a mistura 3% NA+2% SBS é tecnicamente adequada e também pode ser economicamente viável. Desta maneira, tendo em vista o comportamento da mistura modificada por nanoargila e SBS, evidenciado ao longo desta pesquisa, conclui-se que a mesma possui potencial para proporcionar melhorias ao setor rodoviário brasileiro.
Abstract : In Brazil, the development and study of high-performance asphalt mixtures are justified because of the high contingency of early distresses identified on roads, which contrast with the remarkable importance of road transportation to the country. From this context, this work aims to evaluate the rheological behavior and to predict the performance of an asphalt mixture simultaneously modified by nanoclay and SBS polymer. For this purpose, a laboratory procedure was adapted for the modification of a conventional asphalt binder whereby nanoclay and polymer were incorporated into the asphalt matrix in amounts of 3% and 2%, respectively. Subsequently, the mixture produced with the modified binder (3% NA + 2% SBS) was investigated in relation to design, to deleterious effects of water, to permanent deformation, to modulus and fatigue (four point bending test) and to numerical simulations of pavement structures. The results were compared to those obtained by Melo (2014) and by Marcon (2016), who evaluated similar asphalt mixtures but these produced with conventional binder, with binder modified only by nanoclay (3% NA) and with binder modified only by SBS (SBS 60/85). As a result, the dosage study indicated a level of project binder equivalent to that obtained for the mixture with CAP 50-70 and intermediate if compared to those obtained for the mixtures 3% NA and SBS 60/85. In the evaluation of the deleterious action of water effect and the phenomena of permanent deformation, the mixture 3% NA + 2% SBS showed to be superior to the others. In the rheological study, it presented relatively high complex modulus and the smallest phase angle values. The results of the fatigue strength tests, however, demonstrated the superior behavior of the mixture SBS 60/85 followed by the behavior of the mixtures 3% NA + 2% SBS, 3% NA and conventional. However, based on the numerical simulations, it has been found that the replacement of surfaces with conventional mixtures, 3% NA and SBS 60/85 by surfaces with the mixture 3% NA + 2% SBS is technically appropriate and can also be economically viable. Thus, considering the behavior of the mixture modified by nanoclay and SBS evidenced throughout this study, it is concluded that it has potential to provide improvements to Brazilian road sector.
Miles, Prudence E. "Teachers' use of multiplatform educational screen content: The case of Australia's SBS." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/107547/3/Prudence%20Miles%20Thesis.pdf.
Повний текст джерелаOliveira, Juliana Ferreira de. "Estudos estruturais e funcionais de proteinas da familia SBDS com enfase nas ortologas de Trypanosoma cruzi e humana." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/314721.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia
Made available in DSpace on 2018-08-14T05:56:20Z (GMT). No. of bitstreams: 1 Oliveira_JulianaFerreirade_D.pdf: 4266971 bytes, checksum: b6c93b83027283390194f44df501c5b2 (MD5) Previous issue date: 2009
Resumo: Proteínas da família SBOS (Shwachman-Bodian-Diamond Syndrome) ocorrem largamente na natureza e s.ão bastante conservadas, apresentando ortólogas em Archaea e eucariotos. Estudos de análises genômica e biofísica tem relacionado a SBOS com o metabolismo de RNA e biosíntese de ribossomos. O gene ortólogo da SBOS de Archaea está localizado em um operon conservado que contém genes do processamento de RNA; estudos de perfil de expressão gênica tem agrupado o gene da proteína SBOS de Saccharomyces cerevisiae, Sdo1p, com fatores do processamento de rRNA e estudos de análise proteômica identificaram a interação da proteína Sdo1p com fatores da biossíntese de ribossomos; ortólogas de planta contém um C-terminal estendido apresentando motivo de ligação a RNA. Mutações identificadas no gene SBDS tem sido relacionadas com a síndrome Shwachman-Oiamond (80S), uma doença caracterizada por insuficiência exócrina pancreática e disfunção na medula óssea, cujos pacientes apresentam grandes chances de desenvolver leucemia. SOS representa, portanto, um importante modelo para entender os processos envolvidos no desenvolvimento da leucemia. O objetivo principal desse trabalho consistiu na caracterização estrutural e funcional de proteínas da família SBOS. Foram realizados ensaios de cristalização com ortólogas ; da SBOS de Archaea, levedura, tripanossoma e humana. A SBOS de Pyrococcus abyssi foi cristalizada, porém os cristais difrataram a baixa resolução (3,50 A). A ' caracterização da SBOS ortóloga de Trypanosoma cruzi (TcSBOS) mostrou que esta, proteína contém uma região C-terminal estendida. Ensaios de proteólise limitada,' dicroismo circular e espectroscopia por Ressonância Magnética Nuclear (RMN) indicaram que a região adicional da TcSBOS se comporta como um fragmento de proteína intrinsicamente desenovelado, responsável pela interação da TcSBOS com RNA, verificada por ensaios de Electrophoretic Mobility Shift Assay (EMSA). Também foi realizada a determinação da estrutura da ortóloga humana (HsSBOS) em solução por espectroscopia de RMN. A proteína HsSBOS é composta de três domínios bem estruturados, apresentando mobilidade conformacional entre os domínios N-terminal e central. Experimentos de titulação de RNA, novamente utilizando-se RMN, possibilitaram a confirmação da interação direta da SBOS humana com RNA. A região de ligação ao RNA foi identificada no N-terminal da proteína, região bastante conservada na família e considerada o principal alvo das mutações relacionadas à doença SDS
Abstract: The Shwachman-Bodian-Oiamond syndrome (SBOS) protein family occurs widely in nature and is highly conserved, with orthologues in Archaea and eukaryotes. Genomic and biophysical studies have suggested involvement of this protein in RNA metabolism and in ribosome biogenesis. Archaeal SBOS orthologue genes are located within highly conserved operons that include RNA-processing genes; transcriptional profiling analysis has clustered the yeast ortholog protein Sdo 1 p with rRNA processing factors and proteomic analysis have identified potential interactions between Sd01 p and ribosome biogenesis factors; several plant SBOS orthologues contain extended C-terminal region with putative RNA binding motif. Mutations in the SBDS gene are associated to the Shwachman-Oiamond syndrome (SOS), arare multisystem disorder characterized by exocrine pancreatic insufficiency, bone marrow dysfunction, and an increased risk of acute myeloid leukemia. SOS therefore represents an extremely useful model for understanding leukaemogenesis. The objective of the present work was the structural and functional characterization of the SBOS protein family. SBOS orthologues from Archaea, yeast, trypanosomatid and human were assayed for crystallization. The Archaeal SBOS orthologue, PaUPF0023 in Pyrococcus abyssi, was crystallized, but the crystals 'diffracted to a relatively low resolution (3.50 A). Characterization of the Trypanosoma cruzi SBOS ortholog (TcSBOS) by using limited proteolysis, circular dichroism and NMR analyses indicated that the C-terminal additional region of TcSBOS behaves as a natively unfolded protein segment, responsible for TcSBOS-RNA interaction activity in electrophoretic mobility shift assays. We have also determined the solution structure and backbone dynamics of the human SBOS protein using NMR spectroscopy. The overall structure of human SBOS comprises three well-folded domains with conformational exchange in the linker between the N-terminal and the central domains. RNA titration experiments using NMR spectroscopy provide evidence that human SBOS interacts with RNA via the N-terminal domain, a conserved region in the SBOS family and the most frequent target for SOSassociated mutations
Doutorado
Bioquimica
Doutor em Biologia Funcional e Molecular
Zegarra, Jorge Rodolfo Escalante. "Avaliação de misturas produzidas com ligantes asfálticos peruanos convencional PEN 60/70 e modificados por polímero SBS tipo I 60/60 e PG 76-22." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/18/18143/tde-26042007-173415/.
Повний текст джерелаThe main goal of this work is the evaluation of the behavior of conventional peruvian asphalt binder AC PEN 60/70 and SBS polymer-modified asphalts I 60/60 and PG 76-22, when used in hot-mix asphalt (HMA), under both conditions with and without short-term aging. It aims also to establish the asphalt binder performance grade (PG), which is based on the weather conditions, for different peruvian regions. The peruvian asphalt binders were submitted to conventional and Superpave laboratory tests: penetration, softening point, Brookfield viscosity, flash point, elastic recovery, storage stability, rolling thin film oven test (RTFOT), pressure aging vessel (PAV), dynamic shear rheometer (DSR) and bending beam rheometer (BBR). For the evaluation of mechanical properties 196 specimen were sumitted to Marshall, indirect tensile strength under static loading, indirect tensile strength under static loading after induced moisture, resilient modulus under dynamic diametric compression, static and dynamic creep and fatigue tests. The result show that polymer-modified asphalt binder improve rheological characteristic, in terms of thermal susceptibility and resistance to aging, and also improve the asphalt mixtures behavior, which was verified in all of the mechanical tests and after the structural analysis performed with the Elsym5 program, for all of the short-term aging conditions studied in this work.
Amaral, Simonne da Costa. "Estudos de misturas asfálticas densas com agregados do estado do Pará, utilizando asfalto convencional (CAP-40) e asfalto modificado com polímero SBS (BETUFLEX B 65/60)." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/18/18137/tde-07012003-194218/.
Повний текст джерелаThis research intends to analyze the advantages of hot-mix asphalt mixtures composed by polymer modified binder and gravel in relation to those made with conventional binder. To achieve the objective, there were compacted seventy five specimens with conventional binder and seventy five specimens with SBS polymer modified binder (BETUFLEX B 65/60) and were performed Marshall tests, static creep (40oC) tests, indirect tensile strength tests and resilient modulus by indirect tensile (25oC) tests. The results of Marshall and tensile strength tests showed a better performance of the polymer modified asphalt mixes than that presented by the conventional asphalt ones. The results from the relation of resilient modulus by indirect tensile and indirect tensile strength tests probably showed that the modified asphalt mixes have the best performance. The elastic strains from static creep tests also showed a better performance of the polymer modified mixes in three of the five binder contents, however, the others properties from static creep tests like as total strain, viscoplastic strain and creep modulus showed that the conventional asphalt mixes have the best performance.
Günther, Alexandra [Verfasser]. "Charakterisierung von Episoden gestörter Atmung mittels eines suprasternalen Geräuschsensors bei Patienten mit schlafbezogenen Atmungsstörungen (SBAS) / Alexandra Günther." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2018. http://d-nb.info/1160514682/34.
Повний текст джерелаPAIVA, JOSE ANTONIO GODINHO. "EFFECT OF THE IONOSPHERE OF LOW LATITUDES IN GPS - SBAS (GLOBAL SYSTEM POSITIONING - SPACE BASED AUGMENTATION SYSTEM)." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5863@1.
Повний текст джерелаA ionosfera de baixas latitudes tem características que poderiam causar problemas à operação do GPS/SBAS. Entre elas se encontra a anomalia equatorial, cuja densidade eletrônica pode apresentar intensos gradientes horizontais (e, portanto, no índice de refração do meio). Estes gradientes podem ser intensos o suficiente para introduzir erros nas previsões resultantes do GPS/SBAS. Para avaliar este problema, foi desenvolvido um programa de simulação em computador que integra modelos para: (i) a previsão das posições dos satélites da constelação GPS; (ii) a evolução temporal e espacial da densidade eletrônica da ionosfera equatorial; e (iii) uma rede de estações de referência de posições fornecidas para analisar os efeitos da anomalia equatorial sobre os erros causados pela ionosfera nos sinais dos satélites GPS recebidos pelas estações. Em cada passo da simulação, diversos procedimentos são realizados. Estes procedimentos são repetidos um grande número de vezes e, ao final da simulação, estatísticas dos erros são apresentadas. Este programa de simulação em computador foi utilizado para analisar a influência do número de estações de referência, assim como de suas localizações, nos erros de posicionamento de aeronaves.
The low-latitude ionosphere has some features that could cause problems even to the joint GPS/SBAS operation. Among them, one finds the equatorial anomaly, whose electronic density - and thus its refractive index - can present intense horizontal gradients. These gradients can be intense enough to induce errors in the predictions by the GPS/SBAS. To analyze this problem, a computer simulation program has been developed. This program integrates models for: (i) forecasting the satellite orbital positions of the GPS constellation; (ii) the temporal and spatial evolution of the electronic density of the low-latitude ionosphere; and (iii) a given network of reference stations to analyze the effects of the equatorial anomaly on the GPS satellite signals received by the stations and users. In each step of the simulation, several procedures are performed. These procedures are repeated several times and, at the end of the simulation, error statistics are presented. This computer simulation program has been used to analyze the influence of the equatorial anomaly and of the number and layout of reference stations upon the errors in aircraft positions provided by the GPS/SBAS.
CAVALCANTI, Thiago Rodrigues. "Uma análise sistemática de literatura do Simpósio Brasileiro de Engenharia de Software (SBES): aspectos qualitativos e quantita." Universidade federal de Pernambuco, 2011. https://repositorio.ufpe.br/handle/123456789/18497.
Повний текст джерелаMade available in DSpace on 2017-04-06T14:40:56Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação[Final] - Thiago Rodrigues Cavalcanti (3).pdf: 3773887 bytes, checksum: c9be5fcff2f29f4495fef60413a169f6 (MD5) Previous issue date: 2011-03-15
O Simpósio Brasileiro de Engenharia de Software (SBES) está na sua 25ª edição em 2011. Ao longo da sua história, vários progressos no campo da engenharia de software foram publicados e debatidos. Durante o Simpósio, os avanços e pesquisas ganham voz e repercutem no meio acadêmico nacional. Entender como a pesquisa de engenharia de software publicada no SBES evoluiu nesse período é o principal objetivo deste trabalho. Os demais objetivos se relacionam com o primeiro diretamente. Compreender quais as áreas de pesquisa e os métodos mais utilizados, e ainda traçar um histórico das abordagens, das unidades de análise e dos gêneros de pesquisa. Neste trabalho ainda quantificamos os artigos publicados em inglês, a quantidade de referências e citações de cada paper. Para entendermos essa evolução foi necessário utilizar algumas classificações difundidas na literatura visando avaliar os trabalhos publicados e os simpósios como um todo. A metodologia utilizada passou pela leitura dos últimos 24 anos do SBES e a consolidação em um formulário de extração. O método inclui ainda detalhes e exemplos dos critérios utilizados, visando dar maior qualidade ao processo. Por fim, uma ferramenta de consolidação automatizada integra os valores encontrados. Os resultados mostram como cada um dos critérios acima definidos evoluiu ao longo do tempo, quais centros de pesquisa têm mais espaço no contexto do SBES e quais aspectos do estudo da engenharia de software podem ser aprimorados. Deste modo, este trabalho ajuda a entender o panorama brasileiro de engenharia de software e demonstra o papel relevante da pesquisa para evolução da ciência.
The Brazilian Symposium on Software Engineering (SBES) is on its 25th edition in 2011. Throughout its history, several improvements in the field of software engineering have been published and discussed. During the Symposium, the advances and researches gained voice and repercussions in the national academic environment. Understanding how software engineering research published in SBES evolved in this period is the main objective of this work. The other objectives are directly related to the first. To understand the areas of research and the methods used, and build a historical analysis of the research approaches, the unit of analysis and the type of research. This work has quantified the articles published in English, the number of references, and citations of each paper. In order to understand this evolution, it was necessary to use some widespread classifications in literature to evaluate the published works and symposia as a whole. The methodology began by reading the last 24 years of SBES and the consolidation in an extraction form. The method also includes details and examples of the criteria employed to give more quality to the process. Finally, an automated consolidation tool integrated the values found. The results show how each of the criteria described above has evolved over time, research centers which have more space in the context of SBES and also which aspects of the study in software engineering can be improved. Thus, this work assists to understand the Brazilian panorama of software engineering and demonstrates the important role of research for science advance.
Hürlimann, Gisela. ""Die Eisenbahn der Zukunft" : Automatisierung, Schnellverkehr und Modernisierung bei den SBB 1955 - 2005 /." Zürich : Chronos, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=2896232&prov=M&dok_var=1&dok_ext=htm.
Повний текст джерелаWaldman, Walter Ruggeri. "Interação entre processos degradativos na blenda de polipropileno e poliestireno compatibilizada com SBS." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/248659.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica
Made available in DSpace on 2018-08-06T23:19:24Z (GMT). No. of bitstreams: 1 Waldman_WalterRuggeri_D.pdf: 3716743 bytes, checksum: 268e7c9de8037c6859995d6e15f2f375 (MD5) Previous issue date: 2006
Doutorado
Quimica Inorganica
Doutor em Ciências
Pachamango, Rodríguez Ana, Rojas Roxana Pacheco, and Tinco Giomar Ruiz. "Plan de auditoría interna a ser presentado ante la SBS para su autorización." Master's thesis, Universidad del Pacífico, 2018. http://hdl.handle.net/11354/2287.
Повний текст джерелаCui, Zhanwu. "Use of binder rheology to predict the cracking performance of SBS-modified mixture." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0001328.
Повний текст джерелаRossato, Jéssica Helisa Hautrive. "Obtenção e estudo de blendas poliméricas de ABC com copolímero em bloco SBS." reponame:Repositório Institucional da UFABC, 2016.
Знайти повний текст джерелаDissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Nanociências e Materiais Avançados, 2016.
Blendas de poli(acrilonitrila-estireno-butadieno) (ABS) com modificadores de impacto tipo estireno-butadieno-estireno (SBS) foram obtidas para melhorar ainda mais a resistência ao impacto e melhorar a processabilidade de determinados tipos de ABS. Neste trabalho o objetivo foi à obtenção de blendas ABS/SBS e a investigação do comportamento de resistência ao impacto em função da temperatura. As blendas foram obtidas por extrusão de três diferentes tipos de ABS com diferentes conteúdos de SBS. Foram caracterizadas as propriedades de fluxo, as propriedades reológicas, as propriedades mecânicas e a morfologia de fratura dos materiais obtidos. Concluiu-se que não ocorreu a tenacificação do ABS com adição dos conteúdos de SBS, com exceção das blendas ABS 1 com mais de 10% em massa de SBS. Isto mostrou a influência das características e da composição dos ABS e do SBS, e do processamento no comportamento mecânico e na morfologia obtida pela blendas, além da influência do conteúdo em massa de SBS adicionado. As análises das morfologias de fratura mostraram que as blendas de ABS 1 com mais de 10% em massa de SBS possuem um tamanho de partículas menor que nas blendas ABS 2/SBS e ABS 3/SBS, e também uma melhor distribuição das partículas. Nos resultados dos ensaios de tração notou-se um aumento no alongamento na ruptura com o aumento do conteúdo de SBS nas blendas, com uma pequena diminuição do módulo de elasticidade e na tensão no escoamento. Porém, a adição do copolímero em bloco fez com que houvesse uma melhora na processabilidade nas blendas que foi observado nos ensaios de MFI, reometria capilar e reometria de torque.
Blends of poly(acrylonitrile-styrene-butadiene) (ABS) with impact modifiers type styrene-butadiene-styrene (SBS) were obtained to further improve the impact resistance and improving processability of certain types of ABS copolymer. In this work, the objective was to obtain of ABS/SBS polymer blends and the investigating the behavior of the impact resistance versus temperature. The blends were extruded from different types of ABS with different SBS content. Were characterized the flow properties, rheological properties, mechanical properties and fracture morphology of the materials. Concludes that there wasn¿t toughening of ABS with addition of SBS content, except ABS 1/SBS blends with more than 10 w.t% of SBS. This showed the existence dependency characteristics and composition of ABS and processing in the mechanical behavior and morphology of the blends obtained, besides the influence of the content of SBS added. The analysis of fracture morphology showed that blends of ABS 1 copolymer with more than 10 w.t% of SBS having a less particle size than in the ABS 2/SBS blends and ABS 3/SBS blends, and better distribution of the particles. In the results of tensile tests were noted an increase in elongation at break with increasing content of SBS in the blend, with a small decrease in the elastic modulus and yield strength. However, the addition of block copolymer had caused an improvement in processability in the blends, which was observed in the MFI tests, capillary rheometer and torque rheometer.
Taira, Claudio. "Avaliação do desempenho em laboratório de misturas asfálticas densas utilizando asfalto convencional (CAP-20) e asfalto modificado com polímero SBS (BETUFLEX B 65/60)." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/18/18137/tde-09052016-111805/.
Повний текст джерелаThe purpose of this study is to evaluate the performance of asphalt mixes using conventional binder and the same binder modified with SBS polymer (Betuflex B 65/60) based on Marshall test, static and dynamic creep tests, indirect tensile strength test and resilient modulus by indirect tensile test, with the same granulometric composition and different binders contents. In Marshall test, polymer modified asphalt mixes presented better stability performance than conventional asphalt mixes in most of binders contents, despite of the higher flow values obtained for all binders contents. The static creep test results indicated that this test does not clearly distinguish the effect of polymer in asphalt mixes while the results of dynamic creep test indicated the opposite, i. e., polymer modified asphalt mixes deformations are smaller for most of the asphalt binders contents studied. The indirect tensile strength test results showed a better performance of modified asphalt. The results of resilient modulus by indirect tensile test at 25°C showed smaller values for modified asphalt, while the results at 5ºC and 40ºC did not show differences between the asphalt mixes. The mathematics modelling of the creep and recovering curves according to constitutive equations of some basic visco- elastic models showed a difference between the values of some constitutive elements in both cases, dynamic and static tests.
Zhou, Yanmin, and 周延敏. "Impacts of temperature and salinity on nitrification rate and microbial community in laboratory scale sequencing batch reactors(SBRs)." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47050718.
Повний текст джерелаSchenk, Andreas [Verfasser], and B. [Akademischer Betreuer] Heck. "PS-Interferometrie in urbanen Räumen - Optimierte Schätzung von Oberflächenbewegungen mittels Multi-SBAS Verfahren / Andreas Schenk. Betreuer: B. Heck." Karlsruhe : KIT-Bibliothek, 2015. http://d-nb.info/1078957665/34.
Повний текст джерелаKappe, Philip. "Design and investigation of the emission dynamics of a mode locked SBS-laser oscillator." Phd thesis, [S.l.] : [s.n.], 2006. http://opus.kobv.de/ubp/volltexte/2006/1151.
Повний текст джерелаTomÃ, Luisa GardÃnia Alves. "Efeito da adiÃÃo de nanoargilas e nanocompÃsitos argila/SBS no desempenho de ligantes asfÃlticos." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12991.
Повний текст джерелаCoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior
O presente trabalho trata do desenvolvimento de aditivos nanoestruturados como materiais potencialmente Ãteis para melhorar o desempenho de ligantes na pavimentaÃÃo asfÃltica. Foram preparados e utilizados como aditivos em composiÃÃes variadas: argilas organofÃlicas montmorilonita, vermiculita e CloisiteÂ, copolÃmero estireno-butadieno-estireno (SBS) e nanocompÃsitos SBS/CLO5% e SBS/OVMT5%. Os nanocompÃsitos polimÃricos foram produzidos por meio da tÃcnica de intercalaÃÃo por soluÃÃo. O objetivo foi melhorar as propriedades fÃsicas e reolÃgicas do ligante e, desta forma, contribuir para sua estabilidade ao armazenamento, para sua maior resistÃncia ao envelhecimento oxidativo e para a reduÃÃo da sua susceptibilidade tÃrmica. Os nanomateriais foram caracterizados por difraÃÃo de raios-x (DRX) e por espectroscopia no infravermelho por transformada de Fourier (FTIR). Os ligantes puros e modificados foram avaliados, quanto Ãs suas propriedades reolÃgicas, atravÃs de ensaios em reÃmetro de cisalhamento dinÃmico (DSR). As tÃcnicas de caracterizaÃÃo estrutural (FTIR), termogravimetria (TGA) e envelhecimento simulado em estufas Rolling Thin Film Oven Test (RTFOT), alÃm dos ensaios reolÃgicos realizados em um DSR, tambÃm foram utilizados para avaliar o desempenho dos ligantes na presenÃa dos aditivos nanoestruturados. Os resultados evidenciam que os ligantes modificados resultaram no aumento do mÃdulo complexo (G*) e na reduÃÃo do Ãngulo de fase (δ), o que significa maior resistÃncia destes à deformaÃÃo permanente. A viscosidade, a penetraÃÃo e a suscetibilidade tÃrmica dos mesmos foram adequadas aos limites estabelecidos pela AgÃncia Nacional do PetrÃleo GÃs Natural e BiocombustÃveis (ANP). As propriedades reolÃgicas dos ligantes asfÃlticos (LA) modificados com os nanocompÃsitos foram comparÃveis Ãs do LA modificado com 4,0% de SBS, identificando uma reduÃÃo de custos, dado o potencial de substituiÃÃo de polÃmero pela argila. A presenÃa da OVMT melhorou a estabilidade à estocagem do LA modificado com SBS, resultado este importante, visto que a separaÃÃo de fases à um dos maiores obstÃculos ao uso do SBS na pavimentaÃÃo.
The present work deals with the development of nanostructured additives as potentially useful materials to improve the performance of asphalt binders in paving. They were prepared and used as additives in various compositions: organophilic montmorillonite clay, vermiculite and CloisiteÂ, styrene-butadiene-styrene copolymer (SBS), as well as SBS/CLO5% and SBS/OVMT5% nanocomposites. The polymeric nanocomposites were produced by the technique of intercalation solution. The aim of that was to improve the physical and the rheological properties of the binder and thus to contribute for their storage stability, to improve their resistance to oxidative aging and to reduce their thermal susceptibility. Nanomaterials were characterized by x-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Pure and modified asphalt binder (AB) were evaluated for their rheological properties using a dynamic shear rheometer (DSR). The structural characterization technique (FTIR) spectroscopy, thermogravimetric analysis (TGA) and simulated aging in the Rolling Thin Film Oven Test (RTFOT), in addition to rheological measurements performed on a DSR, were also used to estimate the AB performance in the presence of nanostructured additives. The results show that the modified asphalt binder revealed an increase of the complex modulus (G*) and a reduction in the phase angle (δ), which means a higher resistance of them to permanent deformation. Their viscosity, penetration and thermal susceptibility were in accordance to the limits established by the National Agency of Petroleum, Natural Gas and Biofuels. The rheological properties of asphalt binders (AB) modified with nanocomposites were similar to those modified with SBS 4.0%, which identifies a reduction in costs, taking into account the possibility of replacing the polymer by clay. The presence of OVMT improved the storage stability of the SBS modified AB, which is an important result, since phase separation is a major obstacle to the use of SBS in paving.
Fernandes, Mônica Romero Santos. "Efeitos de aditivo tipo óleo e enxofre na reologia de asfaltos modificados com SBS." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/25410.
Повний текст джерелаThe use of polymer modified asphalts has grown significantly in the last decades due to the increase in traffic density, axle loading in vehicles and tyre pressure. These binders favor the increase of pavement life and the reduction of its maintenancement costs. The most used polymer for asphalt modification is styrene-butadiene-styrene blocked copolymers. This thesis evaluated the effects of different compatibilizers and crosslinkers on rheological behavior of styrene-butadiene-styrene copolymer modified asphalt binders, as well as the influence of its structure, linear or radial. Binder’s characteristics were determined by conventional analysis and tests in dinamic shear rheometer. Data obtained provided evidence of the positive effect of sulfur as crosslinker in modified binders properties, with high tan ō reduction, complex modulus increase and deformation reduction after application of cyclic loads, characteristics that turn possible the existence of pavements with greater rutting and fatigue resistance. It was also verified the shale oil efficacy as a compatibilizer agent, providing an excellent polymer dispersion inside asphalt matrix and a stable storage binder at high temperatures. This oil can be considered as a technical available option to aromatic oil presently in use at pavement industry.
Chiang, Chih-Ming, and 姜智銘. "Investigation of Synthesis, Physical Properties and Application of Styrenic Thermoplastic Elastomers Comprising Linear Triblock SBS and Coupled Pentablock SBSBS Polymers." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/61890017292728373399.
Повний текст джерела國立中正大學
化學工程研究所
105
Thermoplastic elastomeric copolymers comprising a linear SBSBS(polystyrene-polybutadiene-polystyrene- polybutadiene-polystyrene) pentablock and a SBS(polystyrene-polybutadiene-polystyrene) triblock are preapared via living anionic polymerization using s-butyllithium as initiator in cyclohexane without addition any polar solvent in order to obtain low vinyl content in the butadiene block. The polymer also has a polystyrene content 30% and 60% by weight.The styrene blocks within each molecule have approximately similar molecular weight and the butadiene blocks in the pentablock are also equal in size.Two types of polymer compositions have been prepared.One is Big ends type,the other is Small ends type. Number-average molecular weights (Mn) are 60000 g/mol for SBSBS and 30000 g/mol for SBS. According to GPC,Mn and Mw/Mn are based on size exclusion chromatography, and composition is based on NMR and FTIR . We also use NMR to analyze the structure of polybutadiene as 1,4 addition and 1,2 addition. Block copolymers of a narrow molecular weight distribution (1.10) have been analyzed by Differential Scanning Calorimetry, Tensile Testing Machine, Thermogravimetric Analysis and Dynamic Shear Rheometer. These materials are phase-separated and have high mechanical performances. Finally, the mechanical properties of these polymers which are prepared by sequential method and couple method,are compared.
Chun, Lin Mu, and 林睦群. "Fracture Energies and Related Microstructure of SBS and SBS/PS Blends." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/58580959672738556132.
Повний текст джерела元智大學
化學工程研究所
88
ABSTRACT The objective of this study is to investigate fracture energies and related morphology of two systems. The first is specimens of neat styrene-butadiene-styrene (SBS) block copolymers and the second is SBS/polystyrene (PS) blends. The neat SBS specimens were prepared from three different methods; SBSI specimens were cast from toluene solution, SBSII specimens were prepared from compression molding and SBS III specimens were prepared from compression molding after processing in a brabender internal mixer. The specimens of SBS/PS blends with different PS contents were prepared using a brabender internal mixer as well. Fracture energies of all the specimens were measured using a trouser tear test. The glass transition temperatures and tand of PB and PS segments were measured by thermal and dynamic mechanical analyses. The average network strand molecular weight, Mc, were determined by the Flory-Rehner equation from equilibrium swelling using isooctane as a diluent. The microstructure were studied using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). For the neat SBS specimens, SBSI possesses the lowest fracture energies because of morphology with less continuous PS domain and more regular microstructure. The fracture energies of SBSIII were smaller than SBSII due to a smaller value of Mc . For the specimens of SBS/PS blends, SBS/PS=100/44 specimens possess the largest fracture energies than the others. (Keywords: SBS/PS blend; fracture energy; morphology).
Long-Chang, Yu, and 張玉龍. "The Chlorination of SBS." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/26158418226642766951.
Повний текст джерела東海大學
化學工程學系
87
The purpose of this research is investigate the chlorization of SBS. The SBS employed here is Kraton D1102. The experiment is divided into two parts. In the first part, SBS of different chlorme content were, the properties and structure changes are then measured. The method of preparing chlorized SBS is by introducing chlorine gas diluted with 400% volumn excess nitrogen into a high dielectric constant organic solvent ,containing 5wt% SBS. The resulting products are then being examined by NMR, GPC, etc. to compare the differences in structures and properties between the chlorized SBS and the original SBS. A broader MWD, chain scissoring, cross linking and higher glass transition temperature has been observed. Heat degradation temperature has been lowered to around 100 degree C.
ZHANG, GING-ZHANG, and 張慶璋. "Study on PE/SBS, SEBS/PSS blands." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/63498345205793579720.
Повний текст джерела"Der neue sächsische Bergsteiger: Mitteilungsblatt des SBB." Sächsischer Bergsteigerbund, 2020. https://slub.qucosa.de/id/qucosa%3A74222.
Повний текст джерела"Der neue sächsische Bergsteiger: Mitteilungsblatt des SBB." Sächsischer Bergsteigerbund, 2021. https://slub.qucosa.de/id/qucosa%3A74223.
Повний текст джерела