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Wood, Luke, and lukewood@ihug co nz. "Hot rod biology." RMIT University. Applied Communication, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080111.102025.
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This practice-led, project-based research charts, simultaneously, my disenchantment and re-engagement with graphic design. By it's dissemination I hope to articulate: 1. How an evolving understanding of my sense disenchantment emerged from the research, and enabled the process of re-engagement. 2. The role, and importance, of provocation and doubt in creative practice generally, but specifically in practice-led research. The difficulty of provoking one's self, and the strategies through which I have tried to enact a disruptive reframing of my practice. 3. That through the highly reflective nature of practice-led research and the greater sense of self-awareness that inevitable comes from that I have been able to re-engage with graphic design. That this re-engagement has, for me specifically, had much to do with my ability to begin to negotiate my own personal terms of reference, so as to be able to locate myself within a community of practice, and to begin to take part in a discourse that has a certain resonance for me. Central to this research are questions about professional practice, dislocation/disinterest, research, resonance and reinvention. As disenchantment is common, perhaps pervasive, within professional practice, my account of this research will propose that a more general understanding of practice-led research-highly reflective, self-initiated work-is essential if graphic design is to support and sustain imaginative, innovative, and inventive practitioners. Rather than target graphic design's inability to support provocative practices (the studio, or the industry), my research focuses on the potential of the individual practitioner to motivate and design a more generative and engaged practice. As such any observations and/or discoveries are not presented as quantitative 'findings', but should be seen rather as generative understandings that promote future possibility and potential for the practice.
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Fritz, Malin. "Control rod drop during hot zero power : RIA in BWR." Thesis, Uppsala universitet, Tillämpad kärnfysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-201890.
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During operation of nuclear power reactors reactivity initiated accidents (RIA) can occur, such as a control rod drop. If this occurs, the reactivity increase dramatically and leads to an increase in power, fuel enthalpy and fuel temperature. The fuel and reactor can be damaged. A methodology to simulate these accidents has been developed for Forsmark Nuclear Power Plant in cooperation with Westinghouse, referred to as the POLCA7 methodology. The POLCA7 methodology results in a limit for fuel failure regarding reactivity of the control rod that dropped in pcm/control rod percent. The limit is estimated from simulations in POLCA7, a static and deterministic code and POLCA-T, a dynamic code. The aim of this thesis is to evaluate the methodology and investigate what happens in a reactor if a control rod drops during hot zero power. Hot zero power is a phase during start-up, where the power is low (~2% of installed power) and the reactor have operation pressure and temperature. The POLCA7 methodology was applied on historic cycles in Forsmark. To evaluate the POLCA7 methodology the control rod drop was simulated in S3K, a dynamic software. The results from these cycles indicate that the limit for fuel failure set in the POLCA7 methodology in pcm/control rod percent is very conservative for fuel with low and medium burnup. Even though the limit is exceeded, the dynamic simulation in S3K shows that the fuel is far from failure regarding SSM limits in fuel enthalpy and cladding temperature. In this thesis new limits in POLCA7 has been generated, which is remarkably higher than the original limit from the POLCA7 methodology. To challenge the methodology, an unrealistic fuel design was simulated with fuel with high burnup surrounded by high reactive fuel. With this fuel design, the enthalpy limit from SSM was exceeded for the fuel with high burnup. The limit from the POLCA7 methodology was exceeded which indicate that the POLCA7 methodology meets the goal of detecting severe RIAs. Fuel with high burnup seems to be the most important fuel to investigate at a RIA simulation. Another discovery is that POLCA7 gives the most severe accident at 2% power, but in S3K it is given by 3-4% power. This is a problem with the POLCA7 methodology. Suggestions are made on how to lower the calculation time and improve the methodology. A control rod sequence that gives an even power distribution and a core with the fuel with high burnup in the periphery and only a few fresh fuels is preferred to avoid damage at a RIA. A control rod sequence was designed for the new cycle in Forsmark 1, in order to try to create a cycle without problems due to RIA. The new sequence was a success with no control rods exceeding the limit of 82 pcm/control rod percent, and it shows that conclusions about the impact of the sequence are correct. Conclusion is made that the methodology should be further investigated and there are good chances to develop a good and time efficient analysis in the future. One presented suggestion is to have a dynamic simulation of the incident instead of the axial simulation. The evaluation with SSM’s limits would then be direct.
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Morales, Franklin R. "Magnesium and calcium rod injection for desulphurization of steel and hot metal." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61923.
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Gonenc, Zubeyde Sermin. "Coal pyrolysis in a fixed bed reactor." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47449.
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Serbetci, Barbaros. "Finite Element Analysis And Manufacturing Of Fin Connector Rod By Hot Forging Process." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610739/index.pdf.
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Forging operation is one of the most commonly used manufacturing techniques in defense industry. The products of forging operation have higher material strength when comparing to traditional manufacturing operations. Especially, for the mass production, it is a beneficial method considering metal and cost saving.
The commonly used part named Fin Connector Rod in defense industry requires high material strength due to working conditions. In this thesis, manufacturing of this part by hot forging operation is accomplished after analyzing by using the finite element method.
Two alternative forging processes are compared and the applicable alternative method is selected by using a finite element program. Dies are designed for applied processes. The stress distribution and the current temperature variation within the parts analyzed to evaluate the results. The fin connector rod is manufactured according to the results of the finite element analysis. It has been observed that, manufacturing of the fin connector rod by hot forging is succeeded and the waste material and cost is reduced when compared to the machining operation which is being used currently.
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Dixon, Teresa Joan. "The effect of microstructure in the advances of hot rolling of steel." Thesis, University of Sheffield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286885.
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Betshammar, Jan. "Improved Billet Shape Modeling in Optimization of the Hot Rod and Wire Rolling Process." Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7914.
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<p>The hot rod and wire rolling process is widely used to produce rolled iron alloys in different shapes and dimensions. This industry has been under a constant development during the last decades. Today, complex geometries are produced at a high speed since it is possible to use several stands in each mill at the same time. A reason for the development is rising demands from customers. The most important demands are to save energy, to get better material properties and higher dimension accuracy. To meet these demands on speed and accuracy, a better control of how the material behaves in the process is needed. There is also a need to be able to quickly find a new setup of the mill in order to be able to produce other geometries.</p><p>The purpose with this Master Thesis is to model and simulate the hot rod and wire rolling process with the modeling language Modelica. The model is given the known inputs and the desired final result in order to compute the unknown inputs to the mill. To meet these goals, a model that depends on for example the gap between the rolls, the roll speeds and the tensions between different stands is needed. It should be possible to make simulations to find roll speeds or to calculate the tensions caused by known roll speeds.</p><p>With the help of models of the steps in the process, a model has been developed in Modelica. The model can be expanded to a mill with an arbitrary number of stands. In the search for the best way of modeling a hot rod and wire rolling mill, several algorithms have been simulated and analyzed in Modelica. The results from all simulations show that the billet and the groove should be described by different functions for the upper and the lower half. Furthermore, it is not a good solution to use only polynomials to describe the shapes in the process. A function with infinite derivative in the endpoints is needed to describe the billet in an acceptable way. The problem has also been solved using Matlab. In this work it is shown that the Modelica solution is preferred, compared to solving the optimization problems in Matlab. An advantage with the Modelica solution is that the model can be split into several easily connected sub models. Unfortunately it was even hard for Modelica to solve general problems. The describing functions made it hard to find the intersections and to keep the area constant during the rotation. The least square method could lead to bad approximations of the shapes.</p><br><p>Profilvalsning används idag globalt som en process för att tillverka metaller i olika former och har under de senaste årtiondena varit i en lång utvecklingsfas. Numera valsas komplicerade geometrier samtidigt som produktiviteten har ökat drastiskt tack vare möjligheten att valsa med flera valspar samtidigt. Under utvecklingsprocessen har även kraven från kunderna ökat, främst vad gäller energibesparing och noggrannhet på den slutgiltiga produktens dimensioner och materialegenskaper. För att kunna möta dessa krav på snabbhet och noggrannhet krävs större kontroll av hur materialet beter sig i valsningsprocessen och att det snabbt går att bestämma hur valsverket ska ställas in när en ny serie ska tillverkas.</p><p>Syftet med examensarbetet som redovisas i denna rapport är främst att modellera och simulera profilvalsningsprocessen med modelleringsspråket Modelica. Modellen ska sedan kunna användas för att utifrån givna indata till processen bestämma olika inparametrar till valsverket för att uppnå önskat slutresultat. För att nå dessa mål krävs en modell som bland annat beror på spelet mellan valsarna, valshastigheterna och dragen mellan olika valspar. Simuleringar ska kunna göras för att både bestämma önskade valshastigheter och för att beräkna vilka drag givna valshastigheter ger upphov till i valsverket.</p><p>Med hjälp av modeller och beskrivningar av de olika stegen i valsningsprocessen har en modell tagits fram i Modelica. Modellen har en given inprofil och kan sedan byggas ut till ett valsverk med önskat antal valspar. I Modelica har olika modeller och algoritmer simulerats och analyserats för att kunna svara på hur ett profilvalsverk modelleras på bästa sätt. Resultaten från de olika simuleringarna visar att heta och valsspår bör beskrivas med olika funktioner för den övre och för den undre delen av profilen. Det är ingen bra lösning att endast använda polynom för att beskriva de olika formerna. En basfunktion med oändlig derivata i ändpunkterna är nödvändig för att beskriva hetan på ett bra sätt. En fördel med Modelica är även att modellen enkelt kan delas upp i flera enkelt sammankopplade delmodeller. Tyvärr var det svårt även för Modelica att lösa generella problem. Funktionerna som användes för att beskriva de olika formerna gjorde det svårt att hitta skärningspunkter och att hålla arean konstant under rotationen. Minsta kvadratmetoden resulterade ibland i dåliga approximationer av de olika formerna.</p>
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Gao, Wei. "Oxidation of nitride-bonded silicon carbide (NBSC) and hot rod silicon carbide with coatings." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366751.
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Lucsko, David Nicholas. "Manufacturing muscle : the hot rod industry and the American fascination with speed, 1915-1984." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/39177.
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Thesis (Ph. D. in History and Social Study of Science and Technology (HASTS))--Massachusetts Institute of Technology, Program in Science, Technology and Society, 2005.<br>Includes bibliographical references (v. 2, p. 426-437).<br>This dissertation focuses on the pursuits of a particular subset of automobile users: hot rodders, those who modify their standard production automobiles for improved performance. More specifically, this project examines the history of the speed equipment industry - the aftermarket subsector which manufactures high-performance products for hot rodders - from its infancy in the 1910s through the mid 1980s. The thesis begins by examining the role of technological enthusiasm in the early growth of hot rodding, focusing in particular on the ways in which this enthusiasm led a handful of individuals to begin to manufacture high-performance parts in the 1910s, 1920s, and 1930s. After tracing the wartime experiences of these industry pioneers, the project then explores the ways in which, in the midst of America's postwar affluence, the spectacular growth both of the high-performance industry and of hot rodding itself helped spawn the youth-oriented musclecar movement upon which the Big Three would later feed. In its examination of the 1940s and 1950s, the dissertation closely examines the evolution of this industry's production methods in an attempt to understand the manufacturing dynamics of a market-sensitive, flexibly-oriented, late-twentieth-century industrial sector.<br>(cont.) The thesis then explores the ways in which this industry dealt with automotive safety and environmental legislation in the 1960s and 1970s. It concludes with a discussion of the fragmentation of the hot rod market during the 1970s and 1980s, analyzing the manufacturing and marketing challenges this change has wrought. This project sheds new light on the history of the automobile in America in four main ways. It highlights the survival of a flexibly-oriented, consumer-driven automotive industry in the shadow of the Big Three. It emphasizes the lingering importance of technological enthusiasm in the evolution of automobility. It uses the experience of the speed equipment industry to reexamine and revise our understanding of the relationship between the Big Three and governmental regulators. And, finally, it challenges the longstanding notion that the automobile had become a 'black box' by the 1920s, documenting the extent to which the social constructivists' 'end-user interpretive flexibility' has instead remained quite strong throughout the history of the automobile.<br>by David Nicholas Lucsko.<br>Ph.D.in History and Social Study of Science and Technology (HASTS
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Yoshimura, Koji. "Robust Design of Roll Pass for Reduced Geometric Variance in Hot Rolling of Steel Rod." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1380554061.
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Rodrigues, Ricardo Adornes. "Comparativo entre o fio máquina produzido com aço SAE 1005 e SAE 1405 modificados para produção de arames recozidos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/85051.
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O presente trabalho visa entender as relações entre as propriedades mecânicas e a composição química de fio-máquinas produzidos com aços SAE 1005 e SAE 1405 modificados e os parâmetros de controle de um laminador a fim de se obter, após a laminação a quente, as propriedades mecânicas semelhantes para os dois tipos de aço. A metodologia adotada envolveu as etapas de revisão da literatura e procedimento experimental D.O.E (Design of Experiments), com coleta de amostras de fio-máquina 5,50 mm produzido com o aço SAE 1005 modificado e outras de fio-máquina 5,50 mm produzido com o aço SAE 1405 modificado, nas condições normais de operação para avaliação das propriedades mecânicas através de ensaios de tração e análise metalográfica. Esse resultado visa criar uma alternativa para a fabricação de arames recozidos com o uso do fio-máquina produzido com o aço SAE 1005 modificado, com um menor custo do produto final.<br>The present work aims to understand the relationships between the mechanical properties and chemical composition of wire rod produced with SAE 1005 and SAE 1405 modified steels and the parameters of a rolling mill in order to obtain, after hot rolling, mechanical properties similar for both types of steel. The methodology involved the steps of literature review and experimental procedure DOE (Design of Experiments), with sampling of 5.50 mm wire rod produced with the SAE 1005 modified and other samples of 5.50 mm wire rod made from steel SAE 1405 modified under normal conditions of operation for evaluation of mechanical properties through tensile testing and metallographic analysis. This result created an alternative for the fabrication of annealed wire using the wire rod produced with the SAE 1005 modified, with a lower total cost of the final product.
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Pereira, Taciana Rezende. "Estudo do efeito do boro na microestrutura e propriedades mecânicas do aço 10B06 utilizado na produção de fios máquina e arames trefilados." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/97/97134/tde-20112017-172550/.
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O aço 10B06 é utilizado na produção de fio máquina para trefilação. Por ser produzido em aciaria elétrica, o teor de nitrogênio desse aço tende a ser elevado, o que pode causar o fenômeno de envelhecimento, resultando em aumento de resistência e queda de ductilidade. Reduzir o teor de nitrogênio livre é uma forma de minimizar esse efeito, o que é realizado pela adição de boro. Dessa forma, o presente trabalho teve como objetivo estudar o efeito do boro no aço 10B06. Foram utilizadas amostras de fio máquina, diâmetro 5,50mm, e arame trefilado com teores de boro variando de 55 a 112ppm. Os dois principais fatores que influenciam a microestrutura e propriedades mecânicas do material são a composição química e o processo produtivo. Por esse motivo, inicialmente foi avaliada a etapa de resfriamento durante a laminação do fio máquina, por meio de uma análise termográfica. Foi encontrada a temperatura de 767ºC no início do resfriamento do material, valor próximo de Ac1, limite inferior do intervalo intercrítico. Esse fato favorece o enriquecimento da austenita em carbono, facilitando a formação de martensita e/ou austenita retida. Os resultados da análise metalográfica com Nital revelaram microestrutura composta de aproximadamente 88% de ferrita e 12% de perlita. Já o reagente Le Pera identificou ilhas de martensita e/ou austenita retida (MA), o que foi comprovado por análises de microscopia eletrônica de varredura. Os resultados de microdureza mostraram uma tendência de queda com o aumento do teor de boro. As medições de nanodureza confirmaram a presença do microconstituinte MA. A ferrita apresentou dureza na faixa de 280 - 320 HV, enquanto o MA ficou no intervalo de 349 - 424 HV. Comparando-se o limite de resistência obtido no fio máquina com menor teor de boro (55ppm - 434MPa) com o de maior (112ppm - 394MPa), observasse uma redução de 40MPa para um acréscimo de 57ppm de boro, confirmando o efeito esperado para esse elemento pela formação de BN. Utilizando os dados da curva tensão versus deformação foram obtidos os coeficientes de encruamento dos fios máquina, que apresentaram uma tendência de crescimento com o teor de boro, sendo que o material com 101ppm de boro mostrou o melhor valor para aplicação em processos de conformação. As análises fractográficas revelaram que os mecanismos de fratura presentes em todos os materiais foram a formação e coalescimento de microvidades. Considerando-se todas as análises realizadas nesse trabalho foi possível evidenciar o efeito do boro na redução do efeito do envelhecimento provocado pelo nitrogênio. Entre os testes realizados, os que apresentaram as melhores relações B/N foram os de teores 109 e 112ppm de boro. Essas relações estão próximas do valor máximo indicado de 0,8.<br>The 10B06 steel grade is applied to the production of wire rod for drawing. The steel is produced in an Electric Arc Furnace and this process can lead to higher nitrogen levels that cause strain aging resulting in an increase of the strength and ductility loss. The reduction of free nitrogen content through boron addition is one way to minimize this effect that can be done through boron addition. In this way, the present work aims to study boron effect on 10B06 steel. It was used wire rod, diameter 5,50mm and a cold-drawn wire rod with chemical composition from 55 to 112ppm of boron. The main factors that influence the microstructure and mechanical properties of the material are the chemical composition and the productive process. For this reason, initially, the cooling treatment was analyzed using thermography and it was found at the beginning of the cooling process a temperature of 767oC in the material, close to Ac1, lower limit of the intercritical interval. This temperature can facilitate the enrichment of carbon in the austenite, making easier martensite and/or retained austenite formation. The metallographic analysis with Nital etchant showed a microstructure composed of about 88% ferrite and 12% perlite, and Le Pera etchant identified martensite and/or retained austenite (MA), what was confirmed by scanning electron microscope analysis. Furthermore, nanohardness measurements confirmed the presence of the microconstituent MA, as ferrite presented hardness from 280 to 320 HV and MA from 349 to 424 HV. Microhardess results decreased with increasing boron content. A decrease of 40MPa in the tensile strength was observed between the wire rod with boron content of 55ppm (434MPa) and the one with 112ppm (394MPa), in agreement with the expected effect of the BN formation. It was possible to obtain hardening coefficient of the wire rod using the data of the stress versus strain curve, which increased with boron content, and the material with 101ppm of boron showed the best value for forming application. Fractographic analysis revealed that the fracture mechanisms in all the materials were the development and coalescing of microcavity. Considering all the analysis of this study it was possible to confirm boron\'s effect to reduce strain aging caused by nitrogen. Materials with 109 and 112ppm of boron presented the best B/N ratio, with values close to the maximum indicated, 0,8.
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Becker, Renata Helena Santer. "Estudo da influência da taxa de resfriamento e temperatura nos últimos passes de laminação de fio máquina sobre a resposta ao tratamento térmico de esferoidização em um aço DIN 41Cr4." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/96658.
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Este trabalho visa analisar a influência das taxas de resfriamento e temperatura no último passe de laminação a quente de fio máquina de um aço DIN 41Cr4 sobre a microestrutura obtida após a laminação e a sua correlação com aquela resultante do tratamento térmico de esferoidização. Foi avaliado a influência da microestrutura prévia de laminação nos tempos e taxa de resfriamento do tratamento térmico necessários para garantir adequada microestrutura do aço DIN 41Cr4. Foram aplicados conceitos de laminação termomecânica através da variação dos parâmetros: temperatura no último passe de laminação (acabador) e após o último passe de laminação (formador de espiras); velocidade das esteiras do “cooling conveyor” e consequente tempo de permanência das espiras sobre a região de ventiladores e alguns parâmetros no ciclo de tratamento térmico: tempo em patamar e taxa de resfriamento durante a produção de fio máquina redondo de bitolas entre 15,88mm e 16,15mm. A avaliação da resposta às variações impostas ao processo foi realizada através de análises metalográficas de microestrutura no material laminado e no material esferoidizado (grau de esferoidização), descarbonetação e de ensaios de propriedades mecânicas como dureza e tração. A partir dos resultados buscou-se determinar a influência dos parâmetros de laminação na microestrutura do material laminado e a influência desta na resposta ao tratamento térmico de esferoidização. Foram analisadas oito diferentes condições e os resultados mostraram que maiores taxas de resfriamento resultam em microestruturas mais refinadas proporcionando uma simplificação no tratamento térmico, atendendo as propriedades desejáveis no produto final (fio máquina redondo esferoidizado).<br>This work aims to analyze the influence of the cooling rate, the temperature of the finishing pass and at the coil-forming during hot rolling of DIN 41Cr4 steel wire rod on the microstructure and its influence on plateau times and cooling rate during the spheroidizing heat treatment. For this study thermomechanical rolling concepts were applied through the variation of some hot rolling parameters such as: temperature at the finishing pass and at the coils-former, the cooling conveyor belts velocity and some parameters in the heat treatment cycle: soak temperature and cooling rate during the production of round wire rod with 15,88 mm and 16,15 mm diameter. The evaluation response to changes imposed on the process was evaluated by metallographic analysis of microstructure in hot rolled and spheroidized material (spheroidizing degree), hardness, decarburization and tensile test. Eight rolling conditions and cooling rates were analyzed and results showed that higher cooling rates result in finer microstructures allowing a reduction in heat treatment time to achieve the desirable properties in the final product (spheroidized round wire rod).
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Biswas, Souvik. "Simulation of thermo-mechanical deformation in high speed rolling of long steel products." Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-1027103-203032/.
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Thesis (M.S.)--Worcester Polytechnic Institute.<br>Keywords: product geometry; hot rolling; high speed rolling; rolling simulation; bar and rod rolling; free surface; finite element analysis. Includes bibliographical references (p. 69-75).
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Diefenderfer, Stacey D. "Investigation of Fatigue Properties of Superpave HMA at the Virginia Smart Road." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/29538.
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This study investigated the influence of material properties on fatigue life through laboratory fatigue testing of eleven Superpave hot mix asphalt (HMA) mixtures in use at the Virginia Smart Road. Mixtures were sampled from the plant and produced in the laboratory to investigate the influence of production method. Specimens were cut from the in-situ pavement and compacted in the laboratory to evaluate the influence of compaction method. Third point beam fatigue testing was performed at 25ºC and 10Hz. Additional testing at frequencies of 1 Hz and 5Hz, and at 10 Hz including rest periods of 0.4sec and 0.9sec were performed for one mixture to explore the impact of frequency and rest periods. Analyses were performed on the strain-life relationships and predicted endurance strain limits for the mixtures.
Investigation of strain-life relationships for several mixtures indicated that small differences in mixture volumetrics due to the production method have minimal impact on the laboratory fatigue performance of HMA. Comparisons of expected fatigue performance for one mixture indicated that shorter fatigue lives (under the same strain conditions) may be expected for laboratory-compacted specimens when compared to field-compacted specimens, despite visual observation of damage (surface cracking) in the field-compacted specimens. Testing performed on one mixture to determine the influence of different loading frequencies showed that fatigue life was independent of the requencies tested. Investigation of rest period inclusion indicated no differences in fatigue life for loading conducted at 10 Hz frequency and no rest period, 0.4sec rest period, or 0.9sec rest period. The evaluation of specimens cut from the in-situ pavement indicated that location within the lane and orientation did not significantly affect laboratory fatigue performance. The effect of aggregate size was considered; however, results were inconclusive. Using predictive strain-life fatigue equations, the benefits of polymer-modification of binders and use of SMA were shown for mixtures produced in the laboratory according to the job mix formula and to match the plant-produced volumetrics. Evaluation of the predicted fatigue strain endurance limit was performed using an energy-based and an empirical method. The energy method was shown to estimate significantly higher endurance limit strains for mixtures.<br>Ph. D.
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Hunter, Robert Newell. "Calculation of temperatures and their implications for unchipped and chipped bituminous materials during laying." Thesis, Heriot-Watt University, 1988. http://hdl.handle.net/10399/1038.
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Rehnström, Mattias. "Koldiffusionens inverkan på utmattnings-hållfastheten hos varmvalsade sexkantsstänger;The influence of carbon diffusion on the fatigue strength of hot rolled hexagonal rods." Thesis, Högskolan Dalarna, Materialvetenskap, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:du-1570.
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Helstångsborr och konstång kallas bergborrverktyg, som tillverkas av sexkantiga stänger med inre hål för ledning av spolvatten. Dessa spolhål är klädda med ferritiskt rostfritt stål. Innan valsning borras ett centrerat hål i stålämnet som ska valsas. I det borrade hålet appliceras ett rör av ferritiskt rostfritt stål och i det röret skjuts en manganstålskärna in. Efter valsning dras kärnan ut och ett spolhål med invändigt foder av rostfritt stål bildas. Under uppvärmningen och valsningen av stålämnet sker normalt en koldiffusion från manganstålskärnan till det rostfria fodret. Fodrets syfte är att skydda spolhålets yta mot erosion och korrosion.Syftet med arbetet var att hitta en metod som garanterar uppkolning av det invändiga fodret, samt att utreda vad uppkolningen betyder för den mekaniska hållfastheten i stängerna. Ett laboratorieförsök visade att det var bra, med avseende på uppkolning, att blanda stearat i kärnbestrykningsmedlet. Kärnbestrykningsmedlet penslas på manganstålskärnan innan den förs in i stålämnet som ska valsas, dess syfte är att minska friktionen vid kärnutdragningen efter valsning.Ett försök utfördes i valsverket med stearat i kärnbestrykningsmedlet. En grundlig undersökning utfördes på två hetor som valsats med stearat-bestrykningsmedel, samt på en traditionellt tillverkad heta för att ha som referens. Hetorna kapades till provstänger om 1,5 m, totalt undersöktes 55 st.Utvärderingen av verksförsöket visade att stängernas kvalitet blir tillräckligt bra om ingenting oförutsett händer i produktionen, oavsett om koltillskott är tillsatt i bestrykningsmedlet eller inte. Arbetet gav inte en garanterande metod, men visade att stängerna normalt håller hög kvalitet.
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Al-Ausi, R. M. J. "Sulphur extended sand-bitumen mixes for road pavements in hot climates." Thesis, University of Leeds, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355546.
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Evans, Carol Susan. "The Geology, Geochemistry, and Alteration of Red Butte, Oregon: A Precious Metal-Bearing Paleo Hot Spring System." PDXScholar, 1986. https://pdxscholar.library.pdx.edu/open_access_etds/3444.
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Red Butte is located 60 km south of Vale, Oregon, about 20 km west of the Oregon/Idaho border. The butte is within the Owyhee Upland physiographic province of eastern Oregon which lies at the intersection of the Western Snake River Plain, the High Lava Plains, and the Northern Basin and Range provinces.
The butte is composed of Miocene to Pliocene lacustrine and fluvial volcaniclastic sediments. The topography of the butte is controlled by silicification of the sandstones and mudstones which cap it. Silicification and hydrothermal alteration are both structurally and stratigraphically controlled. North-trending normal faults dominate the area, and show progressively less offset in younger units. Strong northwest and minor northeast faults also cut the area.
Anomalous concentrations of Au, As, Sb, and Hg occur in banded quartz, quartz-adularia veins and rarely in calcite-quartz veins cutting basalts. The silicified mudstones at the butte top are generally barren. An hydrothermal explosion crater exposed on the southeast side of the butte lies at the intersection of north and northwest-trending faults. Banded quartz veins, quartz-adularia veins, and quartz-cemented breccias are exposed in the walls of the explosion crater. There is evidence of multiple brecciation events. A few mudstones exposed in the crater wall have an exhalative texture, contain pyrite des seminated along bedding, and contain trace amounts of Au.
The Red Butte system developed as a hot spring venting into a lake, possibly within a caldera. Periodic influxes of air fall tuffs and coarser clastic sediments diluted accumulating fine grained clastic and chemical sediments. As hot, silica saturated fluids rose into cooler lake waters they were cooled and diluted, resulting in silica flocculation near the vents and silicification of the lake sediments as they were deposited. Faults cutting the butte acted as conduits for the hydrothermal fluids. Overpressuring, caused by silica sealing of open fractures, resulted in explosions, generally followed by resealing of the system. Simultaneous faulting, sedimentation, and hot spring activity occurred at different rates throughout the life of the system.
Late in the life of the system, the local water table dropped, and the lake was replaced by a high-energy fluvial system. As the water table dropped below the surface, zones of low pH alteration and bleaching were developed above the hydrothermal vents, implying boiling at depth.
The large explosion crater and bedded explosion breccia on the southeast side of the butte were formed in these last stages of hydrothermal activity.
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Abrahamsson, Jan. "Beteendepåverkan genom hot, en fråga om trovärdighet?" Thesis, Försvarshögskolan, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-6072.
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Tvångsmaktsteorier försöker förstå och förklara vad som skapar framgång vid bruket av tvångsmakt. Tvångsmakt är att med hot, eller småskaliga stridshandlingar, från det militära maktmedlet åstadkomma en önskvärd förändring i en aktörs beteende. Problemet som denna uppsats hanterar är att teorierna om tvångsmakt brister i sin förmåga att förklara vad som skapar ett trovärdigt militärt hot. Detta är ett problem då flera teoretiker påtalar vikten av trovärdighet för att framgångsrikt utöva tvångsmakt. Teoretikerna gör detta utan att förklara eller undersöka denna trovärdighet. En debatt finns om vad som skapar framgång vid bruket av tvångsmakt, är det bara militära relativa kapaciteter eller är det också intresset som står på spel? Denna teoriutvecklande uppsats syftar till att förklara vad som skapar ett trovärdigt militärt hot och hur detta bidrar till framgångsrik tvångsmakt. Genom en jämförande fallstudie mellan Haiti 1994 och Falklandsöarna 1982 undersöks trovärdigheten i det militära hotet. Det teoretiska ramverket utgörs av tvångsmaktsteorier kombinerat med teorier om militär trovärdighet. Undersökningen visar att för att vara framgångsrik vid bruket av tvångsmakt ska det finnas en överlägsen militär kapacitet relativt motaktören. Inget samband kan påvisas mellan värdet på intresset och utfallet av tvångsmakt.
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Axelsson, Lena. "Karakterisering av blodgruppsgenen RHD hos patienter med svagt RhD-antigenuttryck." Thesis, Malmö högskola, Fakulteten för hälsa och samhälle (HS), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-24168.
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Rh-blodgruppssystemet är mycket komplext med 54 blodgruppsantigen som kodas av två nära varandra belägna gener på kromosom 1 – RHD och RHCE. RHD-genen kodar för RhD-proteinet, ett membranbundet protein på erytrocyter vars antigen utgör de kliniskt viktigaste och mest immunogena efter ABOsystemets, och som kan ge upphov till transfusionskomplikationer och hemolytisk sjukdom hos foster och nyfödda. Vissa individer har varianter av RhD-protein som uttrycks svagare än normalt (”svaga D”), eller där vissa epitoper saknas (”partiella D”), och för vilka serologiska metoder inte kan ge enhetliga resultat. Detta orsakar problem vid blodtransfusion, graviditet och bloddonation, och leder ofta till användning av det redan knappa lagret av RhD-negativa blodenheter för att skydda patienten. I detta projekt har åtta prover med svaga RhD-antigenuttryck sekvenserats med avseende på RHD-genen i syfte att fastställa individernas RhDfenotyp. I sex av proverna hittades sex nukleotidpolymorfismer och två deletioner, som alla är sällsynta men dock är kända sedan tidigare. I två prover kunde inga mutationer i exon eller intilliggande intron påvisas som förklaring till de svaga uttrycken av RhD hos dessa individer.<br>The Rh blood group system is very complex with 54 blood group antigens encoded by two adjacent genes on chromosome 1 – RHD and RHCE. The RHD gene encodes the RhD protein, a membrane bound protein on erythrocytes whose antigens are the most clinically important and immunogenic after those of the ABO system, and which can result in transfusion complications and haemolytic disease of the fetus and newborn. Some individuals have variants of the RhD proteins that are expressed more weakly than normal (“weak D”), or have some of the epitopes missing (“partial D”), and for which serological methods cannot give a uniform result. This provides a problem in blood transfusion, pregnancy, and blood donation, and often results in the use of the already sparse supply of RhDnegative blood units for the safety of the patient. In this project, eight samples with weak RhD antigen expression have been sequenced with regard to the RHD gene in order to determine the RhD phenotype of the individuals. In six of the samples, six single nucleotide polymorphisms and two deletions were found, all of which are rare but are previously known. For two of the samples, no mutations in exons or adjacent introns could be detected to explain the weak expression of RhD in those individuals.
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Scholz, Enrico. "Das Fedora Projekt - quo vadis Red Hat." Universitätsbibliothek Chemnitz, 2003. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200301409.
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- Red Hat Linux, Fedora Linux, Fedora Project -- Unterschiede, Hintergründe und Auswirkungen
- Infrastruktur und Mitwirkungsmöglichkeiten
- Stabilität, Releasezyklen und Legacysupport
- 3rd party repositories (Pakete von Fremdanbietern)
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Zemko, Michal. "Diff pro různé typy dokumentů (Red Hat)." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2011. http://www.nusl.cz/ntk/nusl-237080.
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This thesis deals with comparing different types of files, especially source codes. It describes the problem of comparing source code and different ways of solving this problem, from simple line comparison, to AST comparison. Chosen method was comparison based on lexical analysis. This is also described in the work with instruments of its automation. The goal of this thesis is to design and implement modular application, which compares different types of files. The implemented module compares source code in programming languages C/C++, Java a Python. This module is easily extendable for comparisons with other languages.
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Davis, Robin Michelle. "Comparison of Surface Characteristics of Hot-Mix Asphalt Pavement Surfaces at the Virginia Smart Road." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/34177.
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Pavement surface characteristics are important to both the safety of the pavement surface and the comfort of the drivers. As of yet, texture and friction measurements have not been incorporated into the design of pavement surfaces. Seven different wearing surface mixtures, placed at the Virginia Smart Road pavement facility, were studied over a one year time period for both friction and texture properties. A locked wheel skid trailer and a laser profilometer were used to assess the pavement surface characteristics. Laboratory testing of the pavement wearing surface mixtures was performed to determine volumetric and mixture specific characteristics. Testing included gyratory compaction, specific gravity, maximum theoretical specific gravity, ignition testing, and gradation analysis. These material properties were used to study the impact of material properties on pavement surface characteristics. The pavement surface characteristics were analyzed using regression analysis with some measured and calculated parameters relevant to the pavement wearing surface properties. Analysis variables included the skid number at 64 kilometers per hour measured using the ASTM E501 (smooth) and ASTM E524 (ribbed) tires, the mean profile depth, the slope of a linear SN-speed model, the skid number at zero speed from the Pennsylvania State University (1) model, and the International Friction Index parameters.
Analysis determined that testing particulars such as the grade of the test did not significantly affect the measured skid number. However, there is a significant difference between the skid numbers measured using the two tires. Additionally, the relationship between speed and skid resistance is assessed differently between the two test tires. Regression analysis concluded that there is a relationship between surface characteristics and HMA design properties such as the VMA, VTM, Percent Passing #200 sieve, and Binder Type. The influence of these variables on each of the analysis parameters varied.<br>Master of Science
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Tagit, Oya. "Development And Analysis Of Controlled Release Polymeric Rods Containing Vancomycin." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605882/index.pdf.
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Antibiotic use is a vital method for the treatment of most diseases involving bacterial infections. Unfortunately, in certain cases these agents are not effective in treatments against diseases for either some limitation in antibiotic usage because of the side effects or some distribution problems caused by physiological or pathological barriers in the body.
Such problems are thought to be minimized by development of controlled release systems which involve implantation of antibiotic loaded polymeric systems directly to the site of infection. Present study involves Vancomycin, a very strong antibiotic with a wide spectrum of activity, and two biocompatible and biodegradable polymers, poly(3-hydroxybutyrate-co-3-valerate) PHBV and poly(L-lactide-co-glycolide) PLGA, in the construction of rod shaped controlled release systems designed for the aim of local treatment of osteomyelitis.
Vancomycin carrying rods of either PHBV 8 or PLGA (50:50) polymers were prepared by the use of cold paste and hot extrusion methods in two different loading ratios (2:1 and 1:1 P:V). In situ release kinetics of each type of rod was determined by spectrophotometric measurement of vancomycin concentration. For determination of drug content of the controlled release rods initially and at the end of the release experiments, extraction and IR (infrared) studies were carried out. The efficacy of the system was measured in vitro on the bacterial strain, B. subtilis. Characterization of the rods was made by the use of stereomicroscopy and SEM (scanning electron microscopy).
In situ release results of the controlled Vancomycin release formulations revealed that for both polymer types, hot extrusion process enabled the formation of a more compact system that provided slower release of the agent compared to the cold paste method. With the combined effect of variable loading proportion and polymer type the most prolonged release was obtained by PHBV rods having 2:1, P:V, ratio (prepared by hot extrusion method). In general, the release kinetics from the rods obeyed the Fickian diffusion kinetics except for PLGA rods prepared by cold paste method with 1:1 and 2:1 (P:V) loading ratios, which had a first order rate of drug release. According to in vitro bioactivity assays, all the groups effectively inhibited bacterial growth with the first day release samples. On the seventh day, however, only two cold paste samples, PHBV:Vancomycin 1:1 and PLGA:Vancomycin 1:1 had drug content barely sufficient for MEC while the others were in the ineffective range. The IR and grinding-extraction studies proved that Vancomycin was still present within the rods after a ten day release period.
The PHBV rods with 2:1 (P:V) ratio prepared by hot extrusion method seem to be the most promising drug delivery system in terms of providing prolonged release as an implantable drug delivery system for the treatment of bacterial infections of the bone, namely osteomyelitis.
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Laurila, Tea Elisa. "The Metalliferous Sediments of the Atlantis II Deep (Red Sea)." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32229.
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The Atlantis II Deep is a location of modern submarine hydrothermal activity along the slowly spreading Red Sea rift axis. Venting of high-temperature hydrothermal fluids, similar to those associated with black smokers, takes place in a brine pool and has led to the accumulation of 90 Mt (dry, salt free) of stratiform, metalliferous sediment. The conditions of mineralization are unique in the modern oceans, but have been widely suggested as a possible analog of some important ancient stratiform base metal ore deposits. This study shows that many of the proposed genetic models for these ancient deposits may be highly simplified and do not take into account rapid diagenetic transformations, widespread non-equilibrium processes, and many other aspects of metal deposition.
Sediment cores of the Atlantis II muds were last studied more than 30 years ago. High-resolution sampling and careful re-examination of the mineralogy and geochemistry of the sediments, using modern analytical techniques has significantly improved the understanding of the different processes responsible for the formation of the finely layered metallifeous sediments. The geochemistry of the individual layers is controlled by highly variable detrital, hydrogenic and hydrothermal input. Primary depositional pathways from the brine pool are the main control on basin-wide metal distribution (e.g., increasing Cu/Zn away from the vents) including variable enrichment in trace metals via scavenging from the brine pool and from the enriched pore waters. Cu and Zn have been deposited not only as sulfides but also with poorly crystalline Si-Fe-(oxy)hydroxides. A significant proportion of the original non-sulfide Cu and Zn are diagenetically transformed into sulfides, but also carbonates and clays, in large part reflecting sulfide deficient pore waters. Negative δ34S values, previously unrecognized in the sulfide- and metal-rich units, indicate a source of bacteriogenic sulfide. Syn-diagenetic processes also appear to have been responsible for the sharp laminations in the sediments, as well as distinctive zoning of carbonate and clay minerals around the vent source. The early diagenetic transformations observed in the Atlantis II Deep may not be preserved in the ancient rock record but nevertheless have important implications for metal deposition in some of the world’s largest and richest base metal ore deposits.
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Örndahl, Eva. "Quasar host galaxies at intermediate and high redshifts /." Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3451.
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Morian, Nathaniel E. "Effect of geotextile fabrics on reflective cracking of hot mix asphalt overlays in Washoe County, Nevada." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1442863.
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Hudaib, Ala'. "Asphalt Mix Design for Low Volume Roads." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1619752960078631.
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Chin, Brown. "Finite element analysis of the rolling of hot steel rods and its application to microstructural prediction." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ37259.pdf.
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Randall, Heather Sharlene Higgs. "Humans and the Red-Hot Stove: Hurston's Nature-Caution Theorizing in Their Eyes Were Watching God." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/9107.
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This paper gives critical attention to the nature versus caution porch conversation in Zora Neale Hurston's Their Eyes Were Watching God, arguing that this is a legitimate addition to the anthropological discussion of nature versus culture. Addressing literary critics as well as scholars of the environmental humanities and of multispecies studies, I argue that Hurston's nature-caution discussion is a helpful epistemology which Hurston employs throughout her novel to suggest a single, unified way of understanding the human and nonhuman.
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Freter, Victoria K. "Analyzing vertebrate movement in and around natural areas through road surveys." Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1593019635236509.
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Nassar, Walid Mohammed. "Utilization of Instrument Response of SuperPaveTM Mixes at the Virginia Smart Road to Calibrate Laboratory Developed Fatigue Equations." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/28377.
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In the current mechanistic-empirical (M-E) design procedures for flexible pavements, the primary transfer functions are those that relate (a) maximum tensile strain in the hot-mix asphalt (HMA) surface layer to fatigue cracking and (b) compressive strain at the top of the subgrade layer to rutting at the surface. These functions, called fatigue and rutting equations, are usually derived from statistically based correlations of pavement condition with observed laboratory specimen performance, full-scale road test experiments or by both methods. Hot-mix asphalt fatigue behavior is an important component of a M-E design procedure; unfortunately, most of the existing models do not reflect field fatigue behavior. This is manifested in the fact that HMA fatigue failure is achieved much faster under a laboratory setting than in a field environment. This difference has been typically accounted for by the use of a single shift factor based mainly on engineering experience.
The flexible pavement portion of the Virginia Smart Road includes 12 different flexible pavement designs. Each section is approximately 100m long. The sections are instrumented with pressure cells, strain gages, time-domain reflectometry probes, thermocouples, and frost probes. The instruments were embedded as layers were built. Laboratory fatigue tests of field cores and field-mixed laboratory-compacted specimens along with measured response from the instrumented pavement sections at the Virginia Smart Road were used to quantify the differences between laboratory and field environments.
Four shift factors were identified to correlate field and lab fatigue behavior: stress-state, material difference, traffic wander, and healing. Field-measured critical strains and strain energy exerted during truck loading were both used to determine the stress state shift factor. Strain measurements of truck loading distribution (wander) were used to determine the wander shift factor. Finally, results from laboratory fatigue tests on cores and laboratory compacted specimens were used to evaluated a shift factor to account for the difference in compaction procedures. While the derived shift factors utilize the measured stresses and strains at the Virginia Smart Road, calculated strains and stresses, based on appropriate pavement and loading modeling, may also be used.<br>Ph. D.
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Wenzel, Marius. "Genomic, epigenomic and transcriptomic factors affecting host-parasite interactions in red grouse (Lagopus lagopus scotica)." Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=227041.
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Host-parasite interactions are extremely important drivers of evolutionary change, characterised by co-evolutionary dynamics with strong reciprocal selective pressure on both host and parasite genomes. However, little is known about the genomic basis of host-parasite interactions, particularly which genes may affect parasite susceptibility, parasite burden and the ability to resolve energetic life-history trade-offs under chronic parasite insult. This thesis examines the genomic, epigenomic and transcriptomic basis of an avian host's physiological response to chronic parasite infection. The model system throughout is the red grouse (Lagopus lagopus scotica) and its main parasite, the gastrointestinal nematode Trichostrongylus tenuis. T. tenuis is highly prevalent and imposes substantial fitness costs that affect demography and population dynamics through an impact on territorial behaviour, energy balance, fecundity and mortality. Here, the genomic architecture of variation in individual T. tenuis burden is examined via de novo identified candidate genes, genome-wide SNPs and genome-wide cytosine methylation polymorphisms. Further, molecular signatures of natural selection in identified genomic regions are examined across a landscape in northeast Scotland with heterogeneous parasite pressure. Finally, the transcriptomic response of red grouse to experimental T. tenuis infection and manipulation of testosterone titre is harnessed to identify a transcriptomic component in testosterone-driven physiological trade-offs in a sexual selection context.
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Kňažeková, Nikola. "Bezpečnost operačních systémů založených na distribuci Red Hat Enterprise Linux." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-412977.
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Táto diplomová práca sa zameriava zvyšovanie bezpečnosti v operačných systémoch založených na Red Hat Enterprise Linux, na základe analyzovaných zraniteľnosti za posledných 5 rokov. V teoretickej časti sú popísané slabiny a zraniteľnosti, základné bezpečnostné mechanizmy v Linuxe, so zameraním na technológiu SELinux. Technológia SELinux je súčasťou operačných systémov Red Hat Enterprise Linux, Fedora a CentOS. Na základe analyzovaných zraniteľností bola v praktickej časti navrhnutá konfigurácia technológie SELinux. V návrhu sú popísané prvky, ktoré sa budú konfigurovať a tými sú SELinuxové booleany, SELinuxové moduly a SELinuxoví užívatelia, so zameraním na ochranu pamäte, eskalovanie privilégií, spúšťaniu kódu, úniku dat a obmedzenie procesov a užívateľov. Na základe návrhov bola vytvorená konfigurácia v konfiguračnom nástroji Ansible, ktorej cieľom je umožniť užívateľovi jednoducho a rýchlo nakonfigurovať hosťa. Okrem nej boli vytvorene ďalšie dve konfigurácie, ktoré umožnia vrátiť systém do predchádzajúceho stavu alebo uzamknúť SELinuxovú konfiguráciu. Následne sa overoval dopad konfigurácií na použiteľnosť systému a nájdené chyby boli opravené alebo nahlásené. Posledná časť overuje funkčnosť konfigurácie pred zneužitím zraniteľností.
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Bergen, Leo van. "De zwaargewonden eerst ? : het Nederlandsche Roode Kruis en het vraagstuk van oorlog en vrede 1867-1945 /." Rotterdam : Erasmus publ, 1994. http://catalogue.bnf.fr/ark:/12148/cb399013665.
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Proefschrift--Erasmus universiteit Rotterdam, 1994.<br>Mention parallèle de titre ou de responsabilité : The @severely wounded first ? : the Dutch Red Cross and the question of war and peace 1867-1945. Contient un résumé en anglais. Bibliogr. p. [505]-528. Index.
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Khalifeh, Ihssan. "Internship in pavement construction: analyzation of hot bituminous mixtures design, formulation, placement and quality control." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/21945.
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Mestrado em Engenharia Civil<br>Este trabalho prático baseia-se em observações realizadas sobre a execução
de pavimentos rodoviários, a realizar por uma das empresas portuguesas
especializadas nesta área de construção. O trabalho inclui três fases essenciais
da indústria rodoviária, nomeadamente: design e produção de misturas
betuminosas a quente, aplicação de misturas (construção de pavimentos) e
controlo de qualidade. Cada fase é discutida em detalhe para fornecer o melhor
entendimento possível sobre este tópico de acordo com a inspeção do local.
Assim, permite dar uma boa compreensão sobre o trabalho, que estuda em
detalhes todos os aspectos relacionados com a fabricação de misturas
betuminosas a quente, bem como a sua aplicação em pavimentos rodoviários
de acordo com uma série de circunstâncias impostas pela situação prática da
obra, além de garantia de controle de qualidade.<br>This practical work is based on observations conducted over the execution of
road pavements, to be held by one of the specialized Portuguese companies in
this area of construction. The work includes three crucial phases of the road
industry, namely: hot bituminous mixtures design and production, mixture
application (pavement construction) and quality control. Each phase is discussed
in detail to provide the best possible understanding over this topic in accordance
with the site inspection.Thus, it aims to provide a good comprehension about the
work, which studies in detail every aspect related to the fabrication of hot
bituminous mixtures, as well as its application in road pavements according to a
number of circumstances imposed by the practical situation of the construction
site in addition to quality control assurance.
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Ahlgren, Johan, and Robert Karlsson. "En studie av inbyggda brandväggar : Microsoft XP och Red Hat Linux." Thesis, Blekinge Tekniska Högskola, Institutionen för programvaruteknik och datavetenskap, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4833.
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Detta kandidatarbete utreder hur väl två operativsystems inbyggda brandväggar fungerar i symbios med en användares vanligaste tjänsteutnyttjande på Internet, samt att se hur likartade de är i sitt skydd från hot. De två operativsystemen som vi utgick ifrån var Microsoft Windows XP samt Red Hat Linux 8.0. Den hypotes vi arbetat kring lyder enligt följande: De två inbyggda brandväggarna är i stort likartade rörande skydd från hot på Internet och uppfyller användarnas tjänsteutnyttjande. De metoder vi använt, för att svara på vår frågeställning, har delats upp i ett funktionalitetstest och ett säkerhetstest. I funktionalitetstestet provades de vanligaste Internettjänsterna med den inbyggda brandväggen och ifall det uppstod några komplikationer eller ej. De två inbyggda brandväggarna genom gick i säkerhetstestet skannings- och svaghetskontroll via ett flertal verktyg. Genom resultatet kan vi konstatera att de inbyggda brandväggarna klarar av de vanligaste tjänsterna på Internet, men att en skillnad föreligger hos dem vad gäller exponeringen ut mot Internet. Windows XP ligger helt osynligt utåt, medan Red Hats inbyggda brandvägg avslöjar en mängd information om värddatorn, som kan komma att användas i illvilliga syften. Slutsatsen blev att vi avslutningsvis falsifierade vår hypotes då de två inbyggda brandväggarna ej var jämlika i sitt skydd mot yttre hot på Internet.
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Glascodine, Jane. "Stage specificity and the host red cell membrane in Theileria annulata." Thesis, University of Edinburgh, 1989. http://hdl.handle.net/1842/13916.
Full textAbstract:
Theileria annulata is an economically important protozoan parasite (Api-complexa) which cycles between bovine and invertebrate tick hosts. Within the bovid, sporozoites invade leucocytes and develop into macroschizonts: macroschizonts divide, initially by binary fission, in synchrony with the newly transformed host cell, but later merogony takes place, producing merozoites which invade erythrocytes. These are subsequently ingested by the tick. The post-macroschizont life cycle stages are poorly defined, and this experimental project was aimed at investigating the basic biology of these stages at the molecular level. The polypeptide complement of the infected erythrocyte membrane has been investigated. The precise location of piroplasm polypeptides in the infected cells was not determined, but the experimental results indicate that several (most notably molecules of 122kDa, 98-100kDa & 77kDa) are associated with the erythrocyte membrane. Monoclonal antibodies have been raised against infected erythrocytes. By immunofluorescence microscopy, several antibodies recognise, mainly, either the outer perimeter of the piroplasm, vesicular structures (dots), or molecules located within the piroplasm. For the purpose of strain differentiation, a panel of these monoclonal antibodies distinguish between un-cloned preparations of Ankara, Hissar and Gharb stocks. The vast majority of the monoclonal antibodies (27 cloned lines) are stage specific and do not recognise slide preparations of macroschizonts or sporozoites. Merogony has been induced in vitro, in recently transformed macroschizont infected cell lines, and four anti-piroplasm monoclonal antibodies recognise preparations of merozoites. Immunoelectron microscopy results have shown that antibody 5E1 recognises the surface of heat induced merozoites. Western blot analysis suggests that the 30kDa and 120kDa polypeptides, recognised by antibody 5E1, also elicit an antibody response in the bovine host. These antigens are preliminary candidates for part of a molecular sub-unit vaccine against the disease (Tropical theileriosis) caused by T.annulata. The T.annulata gene, which encodes the epitope determining antibody 5E1 has been cloned from a lambda gtl 1 genomic expression library. A model system for investigating the molecular mechanisms of stage differentiation has been developed. Macroschizont merogony can be induced in recently infected cell lines by elevating culture temperatures. Similar heat-treatment, of the same cell line after prolonged passage, fails to result in the differentiation into merozoites. The epitope recognised by antibody 5E1 is stage specific to merozoite and piroplasm stages and preliminary Northern slot-blot analysis, with the cloned gene sequence, suggests that expression is regulated at the level of transcription.
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Whittier, Jeremy, and Christina R. Kalel. "Where did you go? Encouraging female participation within Red Hat, Inc." The University of Arizona, 2016. http://hdl.handle.net/10150/608318.
Full textAbstract:
Edited by Dr. Brandy A. Brown and Romi C. Wittman<br>As U.S.-based companies continue to struggle to fill science, engineering and technology (SET)
positions with domestic talent, a large portion of the available workforce (women) continues to be
underrepresented. This project discusses the strategic advantages of encouraging female workforce
participation in SET roles within global technology companies. Three publicly traded companies -
Netflix, Facebook and Red Hat, Inc. - are compared utilizing self-reported diversity numbers to see
the varying levels of women in those workplaces. The diversity policies and benefits programs of these
three companies are discussed as well as available corporate statements regarding workforce diversity
policies. Finally, utilizing information from programs proven to increase women’s participation and
retention within SET roles, suggestions are provided, namely sponsorship of women in the workplace.
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Pagáčová, Iveta. "Řízení lidských zdrojů v multikulturním prostředí firmy Red Hat Czech, s.r.o." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2013. http://www.nusl.cz/ntk/nusl-224251.
Full textAbstract:
The diploma thesis deals with problems of human resource management in a multicultural environment of the IT company. In addition to theoretical findings, human resource practices in this company will be analyzed. The aim of the work is to propose such solutions in the field of HR that will lead to greater efficiency of the company.
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Karlsson, Christina. "De osynliga barnen : Om den svenska statens skyldigheter gentemot de svenska barnen i nordöstra Syrien." Thesis, Uppsala universitet, Teologiska institutionen, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-444470.
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Mučinis, Darjušas. "Modelling of the interaction component's of recycled hot mix asphalt and research its use in the road pavement construction." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120202_170816-87424.
Full textAbstract:
The purpose of the dissertation is to provide a science-based model of the interaction dynamics among the components and the results of this interaction, which shall help to design and to produce high quality hot-mix asphalt mixtures with granules of recycled asphalt pavement of Lithuanian roads. The main objectives of the dissertation: – To conduct the research, to collect, systemized and analyzed scientific works discussing the factors of asphalt pavement distresses and their influence on the performance of recycled asphalt, the interaction between old and virgin materials, the properties of recycled asphalt pavement mixture, and the recycling process technologies. – To model the factors determining the homogeneity of recycled asphalt pavement. – To model the theoretical viscosity for two types of blended bitumen or for another rejuvenator, and the dynamics of old and virgin bitumen mixing due to the diffusion process occurring in the two-layer film. – To provide systemized principles of asphalt pavement recycling. – To collect the data to show the dynamics of the amount of recycled asphalt pavement used in Lithuanian over the years. – To study the component composition and properties of granules of milled, broken and crushed recycled asphalt taken from Lithuanian roads and city streets. – To determine the influence of rejuvenating bitumen type and its percentage amount on physical and mechanical Marshall Parameters of recycled hot-mix asphalt mixture and on the properties... [to full text]<br>Disertacijos tikslas – pateikti moksliškai pagrįstą komponentų sąveikos dinamikos modelį ir jos rezultatus, leidžiančius projektuoti bei gaminti kokybiškus karštai maišytus asfalto mišinius su Lietuvos kelių dangoms naudoto asfalto granulėmis. Disertacijoje sprendžiami šie pagrindiniai uždaviniai: − Atlikti paiešką, surinkti, dalykiškai susisteminti ir išanalizuoti mokslo darbus, kuriuose tiriama: asfaltinės dangos irties veiksniai ir jų įtaka naudotam asfaltui; senų ir naujų medžiagų sąveika; regeneruoto asfalto mišinio savybės; regeneravimo proceso technologijos. − Sumodeliuoti naudoto asfalto homogeniškumą lemiančius veiksnius. − Sumodeliuoti dviejų rūšių sumaišyto bitumo ar kitos atnaujinančiosios medžiagos teorinę klampą ir seno bei naujo bitumų maišymosi dėl difuzijos dvisluoksnėje plėvelėje dinamiką. − Pateikti susistemintus asfaltinės dangos regeneravimo principus. − Surinkti duomenis apie Lietuvoje išgaunamo naudoto asfalto kiekių dinamiką bėgant metams. − Ištyrinėti Lietuvos keliuose ir miesto gatvėse frezuoto bei išlaužto ir sutrupinto naudoto asfalto granulių komponentines sudėtis ir savybes. − Nustatyti pridedamo atnaujinančio bitumo rūšies ir procentinio kiekio įtaką regeneruoto karštai maišyto asfalto (KMA) mišinio fiziniams ir mechaniniams Maršalo rodikliams, taip pat regeneruoto suminio bitumo savybėms. − Nustatyti su skirtingu kiekiu naudoto asfalto granulėmis regeneruoto KMA mišinio atsparumą vėžių susidarymui. − Pateikti naujus deterministinio ir... [toliau žr. visą tekstą]
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Moscato, Emily Marie. "Brand Communities and Well-being: Learning to Age in a Red Hat." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/64202.
Full textAbstract:
The older female segment plays a critical role in society's fabric, as women past retirement volunteer a significant amount in their communities and provide essential caregiving to family members and friends. Moreover, older females outnumber older males and with the baby boomer population aging over 65, this segment is becoming more influential. Yet there is surprisingly little marketing research that focuses on this older female segment, their lived experiences, and their well-being. Working within the tradition of consumer culture theory, this project is an ethnographic exploration of the Red Hat Society (RHS), a brand community which focuses on celebrating older women. This research adds to the theoretical understanding of older female consumers by exploring how older women negotiate the meaning of aging, gender, and identity. Extending on brand community literature, I suggest how the RHS manages to create a supportive, 'safe space' in which members are able to engage play and learning. Play performances, enacted in through costuming and other rituals within the brand community, are extended beyond the bounds of this 'safe space' to influence the identities and well-being of these women.<br>Ph. D.
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Blain, François 1964. "Phytotoxicity and pathogenicity of Fusarium roseum against red clover." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61848.
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French, Andrew Samuel. "Linking environmental variation across the Scottish Highlands with red deer (Cervus elaphus) trace element status, parasite burden, and skeletal morphometry." Thesis, University of the Highlands and Islands, 2016. https://pure.uhi.ac.uk/portal/en/studentthesis/linking-environmental-variation-across-the-scottish-highlands-with-red-deer-cervus-elaphus-trace-element-status-parasite-burden-and-skeletal-morphometry(b2c569ef-77f4-4fde-9c07-4c8290a9ae88).html.
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Movsesyan, Aleksandr. "Reliable Ethernet." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/602.
Full textAbstract:
Networks within data centers, such as connections between servers and disk arrays, need lossless flow control allowing all packets to move quickly through the network to reach their destination. This paper proposes a new algorithm for congestion control to satisfy the needs of such networks and to answer the question: Is it possible to provide circuit-less reliability and flow control in an Ethernet network? TCP uses an end-to-end congestion control algorithm, which is based on end-to-end round trip time (RTT). Therefore its flow control and error detection/correction approach is dependent on end-to-end RTT. Other approaches utilize specialized data link layer networks such as InfiniBand and Fibre Channel to provide network reliability.
The algorithm proposed in this thesis builds on the ubiquitous Ethernet protocol to provide reliability at the data link layer without the overhead and cost of the specialized networks or the delay induced by TCP’s end-to-end approach. This approach requires modifications to the Ethernet switches to implement a back pressure based flow control algorithm. This back pressure algorithm utilizes a modified version of the Random Early Detection (RED) algorithm to detect congestion.
Our simulation results show that the algorithm can quickly recover from congestion and that the average latency of the network is close to the average latency when no congestion is present. With correct threshold and alpha values, buffer sizes in the network and on the source nodes can be kept small to allow little needed additional hardware to implement the system.
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Schlegel, T., D. Puiatti, H. J. Ritter, D. Lesueur, C. Denayer, and A. Shtiza. "The limits of partial life cycle assessment studies in road construction practices: A case study on the use of hydrated lime in Hot Mix Asphalt." Elsevier, 2016. https://publish.fid-move.qucosa.de/id/qucosa%3A72182.
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Extensive published literature shows that hydrated lime improves Hot Mix Asphalt (HMA) durability. Its impact on the environmental impact of HMA has not been investigated. This paper presents a comparative Life Cycle Assessment (LCA) for the use of HMA without hydrated lime (classical HMA) and with hydrated lime (modified HMA) for the lifetime of a highway. System boundaries cover the life cycle from cradle-to-grave, meaning extraction of raw materials to end of life of the road. The main assumptions were: 1. Lifetime of the road 50 years; 2. Classical HMA with a life span of 10 years, maintenance operations every 10 years; 3. Modified HMA with an increase in the life span by 25%, maintenance operations every 12.5 years. For the lifetime of the road, modified HMA has the lowest environmental footprint compared to classical HMA with the following benefits: 43% less primary total energy consumption resulting in 23% lower emissions of greenhouse gases. Partial LCAs focusing only on the construction and/or maintenance phase should be used with caution since they could lead to wrong decisions if the durability and the maintenance scenarios differ. Sustainable construction technologies should not only consider environmental impact as quantified by LCA, but also economic and social impacts as well. Avoiding maintenance steps means less road works, fewer traffic jams and hence less CO2 emissions.
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Ouyang, Xutong. "Exploring the attributes relevant to accidents between vehicles and unprotected road users, taking Stockholm as an example." Thesis, KTH, Geoinformatik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278990.
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Traffic accidents is one of the major causes of fatalities and economic loss around the world. Thus, there is an urgent need for a better understanding about the factors that contribute to accidents so that the accidents can be prevented in the future. The research objective of this thesis is to analyze the traffic accidents between vehicles and unprotected road users (pedestrians and bicycles) in Stockholm, finding spatial distribution patterns, related attributes and examining relationships between accidents and a number of vehicle flows. The data is first analyzed with general statistical analysis to examine the basic characteristics. There is no apparent trend of change among the number of accidents per year, while the numbers of accidents happening from May to October is higher than the rest of the year except for July due to less traffic during holiday period. Most traffic accidents occur in overcast weather, on a dry road surface, or during the day. In the spatial analysis part of the thesis, Global Moran’s I is used to detect whether there is an attribute-related spatial distribution pattern. Hot spot analysis is then applied on the clustered attributes to find significant hot and cold spots over the study area. The conclusions are that road surface conditions and occurrence time during day/night are two related factors that influence traffic accidents while weather is not considered a related attribute since the accidents distribute randomly in terms of weather, of which it is difficult to obtain temporally-aligned, detailed local information for further analysis. Different parameters are selected and discussed during the process. When calculating the distance between two accidents in traffic accident analysis, Manhattan distance is more appropriate than Euclidean distance since traffic accidents are restricted to the road network. The distance band determines scales of analysis tools, with 50 meters on an intersection and 500 meters for a larger region in Stockholm. Most hot spots arise at intersections and roundabouts where different types of traffic flows meet each other. The result of the relationships between traffic accidents and different types of vehicle flows shows that the correlation coefficients between number of traffic accidents and traffic flows are low, meaning that there is no obvious correlation between them, which is also proved by the scatter plots. Poisson regression model is applied on the traffic accident data. As a result, high-risk and low-risk areas in Stockholm are pointed out. Some are consistent with the hot-spot analysis result.
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Moura, Edson de. "Estudo de deformação permanente em trilha de roda de misturas asfálticas em pista e em laboratório." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/3/3138/tde-17082010-094223/.
Full textAbstract:
Dentre os diversos tipos de defeitos estruturais a que um pavimento está sujeito, a deformação permanente em trilha de roda da camada de rolamento é um dos mais importantes, pois além de propiciar uma degradação acelerada da estrutura do pavimento, ele reduz consideravelmente a segurança do usuário. Este trabalho pesquisa os processos que levam à deformação permanente de revestimentos asfálticos, utilizando como estudo de caso uma pista-teste localizada na Rodovia BR 376 PR, construída com a finalidade principal de estudar os afundamentos em trilha de roda. Foram executados 10 trechos, com 200 m de extensão cada um, em aclive, na 3ª faixa de rolamento, sujeita a tráfego pesado de caminhões lentos. Os trechos experimentais consistem de restauração de pista existente, onde foram executados diferentes tipos de revestimentos asfálticos, variando-se o tipo de graduação e também o tipo de ligante asfáltico, todas dosadas pelo método Marshall. Três dos dez trechos foram submetidos ao ensaio acelerado por um simulador de tráfego móvel de pista, em escala real. As misturas asfálticas foram igualmente ensaiadas em laboratório para verificação da dosagem por equipamento giratório francês e por simulador de tráfego tipo LPC. Além disso, foram extraídas placas do revestimento asfáltico da pista-teste as quais foram submetidas ao simulador de tráfego de laboratório. O objetivo central desta pesquisa foi de estudar a consistência dos resultados obtidos em campo e em laboratório, e a previsibilidade de deformações em campo através do método laboratorial. A pesquisa verificou e analisou a redução do volume de vazios das misturas asfálticas em pista e em laboratório associadas à deformação permanente, procurando relacionar a redução do volume de vazios com a deformação. A pesquisa mostrou que os ensaios de laboratório com o simulador de tráfego LPC podem ser empregados para prever as ocorrências de afundamentos em pista. Os resultados indicam a adoção do limite máximo de 5% de deformação permanente no equipamento de laboratório para os tipos de misturas asfálticas testadas para reduzir as possíveis ocorrências de deformações permanentes de revestimentos asfálticos sujeitos a tráfego muito pesado. Nas condições dos ensaios laboratoriais da pesquisa, que se aplicam à pista-teste, as misturas asfálticas mais recomendadas quanto à resistência à deformação permanente são as misturas com asfalto modificado por polímero SBS e RET, e as misturas com asfalto-borracha. Dependendo das características do ligante, o CAP 30/45 também pode ser empregado; no entanto, o CAP 50/70 mostrou-se inadequado para tráfego pesado e lento. A graduação é uma característica relevante para a estabilidade das misturas asfálticas, devendo os agregados estarem bem entrosados no caso das graduações contínuas e bem-graduadas; no entanto a macrotextura resultante deve ser estudada para evitar superfícies fechadas que reduzam a segurança dos usuários em pistas molhadas. Foram estudadas duas misturas descontínuas gap-graded que se mostraram adequadas para tráfego pesado quanto à deformação permanente e à textura superficial. A pesquisa mostra a importância da seleção criteriosa dos materiais e rigor nos estudos de dosagem, com determinação de propriedades mecânicas para melhor prever comportamento em campo de revestimentos asfálticos sujeitos a tráfego pesado e lento.<br>Among the many types of structural distresses that a pavement is subjected, wheel track rutting is one of the most important because it leads to accelerated deterioration of the pavement structure and also reduces the road safety. This research focus on the processes that lead to rutting in asphalt mixes, using experimental test sites located at Highway BR 376 PR (heavy and slow traffic), which were built with the primary purpose of studying wheel path depressions. Ten testing tracks of 200 m long (total of 2 km) were built on the third lane (upward sloping). The testing tracks were part of the rehabilitation of an existing pavement. Different asphalt mixtures were designed by the Marshall method, varying the aggregate size distribution and the type of asphalt binder. Three of the ten sections were subjected to Accelerated Pavement Testing by the Heavy Vehicle Simulator (in situ). The asphalt mixtures were also prepared and tested in laboratory by the French gyratory compactor and LPC traffic simulator, respectively, in order to verify the mixtures design. In addition, plates were extracted from the asphalt surfaces in the field and then subjected to the traffic simulator in laboratory. The main purpose of this study was to compare the permanent deformation of asphalt mixtures observed in the field to that obtained in the laboratory; and also to evaluate the prediction of permanent deformation based on laboratory evaluation. This research verified the correlation between reduction in the air voids of asphalt mixtures and rutting potential (samples extracted from the field and also prepared in laboratory were analyzed). The research showed that the LPC traffic simulator is a good device to predict permanent deformation of asphalt mixtures in the field. The results indicate 5% as the threshold for the permanent deformation in laboratory to reduce the occurrence of permanent deformation of asphalt mixtures subjected to heavy traffic. For the test conditions used, the mixtures that presented better resistance to permanent deformation were the ones with asphalt modified by SBS and RET, and the asphalt-rubber mixtures. Depending on the asphalt binder characteristics, the CAP 30/45 (classification by penetration) can be used; however the CAP 50/70 presented inadequate behavior for heavy and slow traffic. The aggregate gradation is another important parameter for the stability of asphalt mixtures, where the stones need to present a good interlocking and be wellgraded. The resulting macrotexture should also be evaluated to avoid surfaces with reduced safety to the users in wet conditions. Two mixtures with gap-graded gradation were evaluated and presented good results in respect to permanent deformation and superficial characteristics (texture). This research shows the importance of materials selection, design procedure, and mechanical behavior evaluation to predict the performance of asphalt surfaces subjected to heavy and slow traffic.