To see the other types of publications on this topic, follow the link: DoE.
Dissertations / Theses on the topic 'DoE'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'DoE.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Golden, Carol Anne. "Venerable Doe. [Original opera]." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/185390.
Full textAbstract:
This work is a setting of "Venerable 'Doe,' " and original story and libretto by the composer. "Venerable 'Doe' " is the temporary appellation of Javanese music spirit whose true name is not known. It is also the name of the gamelan over which the spirit reigns and in whose pusaka gong he resides. The work combines traditional Western dance, instruments, orchestration, notation and theory and traditional Javanese court dance, instrument, instrumentation, performance practice and theory with the composer's innovations created to facilitate the combining of two divergent worlds of music. The language of the libretto and the selection of pitch material have been determined by an original, extended, soggetto cavato technique. This technique accommodates all letters of the English alphabet and all pitch classes of both the Western and Javanese scales used in the work. While the soggetto cavato technique expands upon techniques used in the works of J. S. Bach, Venerable Doe's continuous rather than sectional deportment, devotion to symbolism and personification of specific sound patterns as 'motives' continue innovations of Richard Strauss. Venerable Doe is an opera containing two major formal divisions, a fantasy-ballet "Overture," the score of which constitutes the "original composition" portion of this dissertation, followed by four acts of the opera's main body. The "Overture" is designed to be performed with the main body of the opera or as an independent composition. The programmatic content of the "Overture" is drawn from the first half of the story, "Venerable 'Doe,' " while the program of the four acts is from the second half. The work is set in English, and uses Javanese terminology, as well as Swedish, German and Latin translations of Psalm 23. It is scored for full Western orchestra, Javanese gamelan, chorus, soloists, Western and Javanese dancers. Lighting, costuming, dance, stage and visual projection directions appear on the score and in preliminary pages.
2
Johansson, Robin. "Structural optimization of electronic packages using DOE." Thesis, KTH, Hållfasthetslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-285859.
Full textAbstract:
The reliability of a mechanical system containing electronic packages is highly affectedby the environment the system is stationed in. The difference and fluctuationsbetween the ambient temperature and the operating temperature of the electronicpackage cause accumulation of inelastic strains in the package components thusdecreasing the service life. The most common failure modes of an electronic packagehas been identified from inspection of malfunctioning machines as cracks in the solderjoint and delamination between the glue and the die. Knowledge regarding therelationships between parameters affecting these failure modes, which are importantand which are not, is of high interest when developing new and existing products. SAAB AB would like to develop a methodology using design exploration to allow forevaluation of electronic packages using nonlinear finite element methods. A surrogate model was created and parameterized with HyperMorph to be used forthree linear static variations of design of experiments, where both the performance ofthe methods themselves and the relative importance of the parameters were ofinterest. A connectivity condition was also implemented to allow for relativemovement between components while keeping the mesh intact. The designexploration was executed using a Taguchi design, a Modified extensive latticesequence design and a fractional factorial design where the three methods werecompared as well as the parameter significance analysed. An optimization was thenperformed to find the optimal parameter settings within the allowed bounds to beused where a nominal model and an optimized model are evaluated with animplemented creep law. The fatigue life of the two models were then estimated.Tillförlitligheten hos ett mekaniskt system med elektroniska kretsar påverkas starkt av miljön systemet används i. Skillnader och fluktuationer mellan omgivningens temperatur och arbetstemperaturen för de elektroniska kretsarna orsakar ackumulering av inelastiska töjningar, därmed förkortas det mekaniska systemets livstid. Dem vanligaste fel-moderna för en elektronisk krets har identifierats genom inspektion av felande maskiner som sprickbildning i lödfogarna och delaminering mellan processorn och dess lim. Kunskap hur förhållandet mellan parametrar som påverkar dessa fel-moder, vilka som är viktiga och vilka som inte är viktiga är av högt intresse vid utveckling av nya och redan existerande produkter. SAAB AB vill utveckla en metodik som utnyttjar statistisk försöksplanering för analyserande av elektroniska kretsar med hjälp av olinjära finita element metoder för att kunna spegla dess beteende på ett realistiskt sätt. En surrogatmodell skapades och parametriserades med hjälp av HyperMorph för att användas inom tre statiskt linjära varianter av statistisk försöksplanering, där både metodens prestanda och den relativa påverkan från parametrarna var av intresse. Ett kontaktvillkor implementerades för att tillåta relativ rörelse mellan komponenter samtidigt som nätet av finita element hölls intakt. Försöksplaneringsimuleringar utfördes med en Taguchi design, en Modified extensive lattice sequence design och en fractional factorial design, där de tre metoderna jämfördes mot varandra samt analyserades vad gäller respektive parametersignifikansen. Med optimering fanns sedan en optimal modell för att kunna jämföras med en nominell modell där en kryplag implementerades i lödfogen. Livslängden beräknades sedan för båda modeller.
3
Scholtmeijer, R. J. "Doe wel en zie niet om." [S.l.] : Rotterdam : [de auteur] ; Erasmus University [Host], 1993. http://hdl.handle.net/1765/7414.
Full text
4
Gies, Christian. "Evaluation der Prozesseinflussgrößen beim Fließlochformen mittels DoE." Kassel : Kassel Univ. Press, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?idn=982036280.
Full text
5
Gies, Christian. "Evaluation der Prozesseinflussgrössen beim Fliesslochformen mittels DoE." Kassel Kassel Univ. Press, 2005. http://deposit.d-nb.de/cgi-bin/dokserv?idn=982036280.
Full text
6
Ahmad, Mushtaq. "Systematic time-based study for quantifying the uncertainty of uncalibrated models in building energy simulations." Texas A&M University, 2003. http://hdl.handle.net/1969.1/1191.
Full textAbstract:
This thesis documents the usefulness and accuracy of uncalibrated simulations to determine for what end-uses these simulations should be used. The study was divided into three segments 1)comparison of the accuracy of two simulation models, massless and advanced, against measured data 2) comparison of the results from two simulations models, simplistic and massless, to determine the sensitivity of envelope shape and details for two weather conditions 3) identification of the parameters that have a significant impact on the simulation output.
Five buildings were selected as the test sample. Four of the buildings were multi story commercial buildings. The fifth was a single-family residential house. For the first segment of the study two simulation models were created for all the buildings; the massless model with emphasis on the envelope using massless construction and typical values for system parameters and the advanced model with the inclusion of thermal mass and extensive as-built details of the systems. For the second part of the research the simplistic model was created having a single floor one-zone with glazing and conditioned areas equivalent to the massless model. The sensitivity analysis was done using the massless model and selected variables from the loads and systems as sensitivity parameters.
By following the procedure mentioned, it was found that uncalibrated simulation models do not depict the real operating conditions of a building. For some cases the simulated values are higher than the measured data while for others they are significantly lower. The CV (RMSE) between the measured and simulated values ranges from 30 to 150%. From the comparison of the simplistic and massless model, it was concluded that the outer envelope shape and details have an impact on the heating and cooling energy use irrespective of the weather conditions. For internally load dominated buildings this impact is more on the heating loads than on the cooling loads. The conclusions from the sensitivity analysis were that outside air fraction and the total supply air have the most significant impact on the simulation output while thermal mass has a small impact.
7
Nilsson, Marcus, and Johan Ruth. "SPC and DOE in production of organic electronics." Thesis, Linköping University, Department of Science and Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6240.
Full textAbstract:
At Acreo AB located in Norrköping, Sweden, research and development in the field of organic electronics have been conducted since 1998. Several electronic devices and systems have been realized. In late 2003 a commercial printing press was installed to test large scale production of these devices. Prior to the summer of 2005 the project made significant progress. As a step towards industrialisation, the variability and yield of the printing process needed to bee studied. A decision to implement Statistical Process Control (SPC) and Design of Experiments (DOE) to evaluate and improve the process was taken.
SPC has been implemented on the EC-patterning step in the process. A total of 26 Samples were taken during the period October-December 2005. An - and s-chart were constructed from these samples. The charts clearly show that the process is not in statistical control. Investigations of what causes the variation in the process have been performed. The following root causes to variation has been found:
PEDOT:PSS-substrate sheet resistance and poorly cleaned screen printing drums.
After removing points affected by root causes, the process is still not in control. Further investigations are needed to get the process in control. Examples of where to go next is presented in the report. In the DOE part a four factor full factorial experiment was performed. The goal with the experiment was to find how different factors affects switch time and life length of an electrochromic display. The four factors investigated were: Electrolyte, Additive, Web speed and Encapsulation. All statistical analysis was performed using Minitab 14. The analysis of measurements from one day and seven days after printing showed that:
- Changing Electrolyte from E230 to E235 has small effect on the switch time
- Adding additives Add1 and Add2 decreases the switch time after 1 and 7 days
- Increasing web speed decreases the switch time after 1 and 7 days
- Encapsulation before UV-step decreases the switch time after 7 days
8
Martinello, Tiago. "Desenvolvimento de comprimidos de paracetamol de 500 mg fabricados por compressão direta utilizando o planejamento estatístico de mistura." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/9/9139/tde-31082006-160216/.
Full textAbstract:
As formas orais sólidas são as mais utilizadas pela sua facilidade de administração e transporte, além de proporcionarem maior estabilidade, se comparadas às líquidas ou semi-sólidas. Dentre os sólidos orais, os comprimidos destacam-se por apresentarem processo de fabricação relativamente fácil, com alta produtividade e baixo custo. A compressão direta é o método preferencial para a produção de comprimidos pois economiza tempo e energia, é ambientalmente menos agressiva e reduz investimentos em equipamentos e na estrutura da área de produção, por requerer menor número de etapas no processamento que os métodos tradicionais de granulação. A principal limitação para a aplicação desse processo é a baixa capacidade de compactação dos fármacos que requerem altas concentrações para obtenção do efeito terapêutico. Com o objetivo de desenvolver formulações contendo alto teor de fármaco por compressão direta foi utilizado o planejamento estatístico de mistura e o paracetamol como fármaco modelo, pelas propriedades deficientes de escoamento e compactação. O programa Design Expert® foi empregado e forneceu 19 formulações, que foram produzidas e avaliadas quanto ao índice de compressibilidade, ângulo de repouso, umidade, peso médio, friabilidade, dureza, doseamento, desintegração e dissolução. O programa Design Expert® foi alimentado com os resultados obtidos e as formulações foram otimizadas. A formulação otimizada que atendeu a todos os parâmetros de qualidade foi produzida e analisada. Os resultados encontrados foram muito próximos aos previstos pela análise de regressão, demonstrando que o projeto de mistura é uma ótima opção para a pesquisa e desenvolvimento, diminuindo o tempo despendido e o número de experimentos.The solid oral forms are widely used, by easy administration and transport. They provide larger stability than a liquid or semi-solid. Among the solids orals the tablets appear for they present production process relatively easy, with high productivity and low cost. The direct compression is the preferential method for the production of tablets because is less aggressive for the environment, saves time and energy and reduces investments in equipments and in the structure of the production area, for requiring smaller number of stages in the production\'s process than the traditional methods of granulation. The main limitation for the application of that process is the low compaction capacity of the drugs that require high percentages for the therapeutic effect. The aim of this study was developing formulations containing high amount of drug by direct compression using the statistical planning of mixture and the paracetamol as drug model, for the deficient flow and compaction properties. The program Design Expert® was used and supplied 19 formulations that were produced and the compressibility index, angle, humidity, weight, friablility, hardness, assay, disintegration and dissolution were analyzed. The program Design Expert® was fed with the obtained results and the formulations were optimized. The formulation optimized that assisted all quality parameters was produced and analyzed. The obtained results were very close with the regression analysis, demonstrating that the mixture project is a great option for the research and development, reducing the spent time and the number of experiments.
9
Gies, Christian [Verfasser]. "Evaluation der Prozesseinflussgrößen beim Fließlochformen mittels DoE / Christian Gies." Kassel : Kassel Univ. Press, 2006. http://d-nb.info/982036280/34.
Full text
10
Tai, Chih-Che, Karin J. Keith, and Ryan A. Nivens. "ETSU Grant Update: TN DOE MSP and THEC ITQ." Digital Commons @ East Tennessee State University, 2014. https://dc.etsu.edu/etsu-works/3304.
Full text
11
Oliveira, Marcos Fernandes de. "Estudo da influência de organo-silanos na resistência à corrosão de aço-carbono por meio de técnicas eletroquímicas." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-19092006-112719/.
Full textAbstract:
Na presente tese foi investigado o desempenho de camadas de organo-silanos sobre chapas de aço-carbono, similares às utilizadas na fabricação de veículos da indústria automobilística. As técnicas utilizadas neste estudo compreenderam a Espectroscopia de Impedância Eletroquímica (EIE) e a Resistência de Polarização Linear, por meio das quais foram determinadas respectivamente, as propriedades resistivas dos filmes e a redução das velocidades de corrosão do substrato. O estudo compreendeu a avaliação de diversos organo-silanos funcionais e não-funcionais, submetidos a diferentes condições experimentais. Os ensaios preliminares tiveram por finalidade selecionar aqueles com melhor desempenho como sistemas de proteção em monocamadas. A partir desta seleção e,, informações da literatura, novos ensaios foram conduzidos por meio de um Projeto Fatorial de Experimentos, combinando os silanos funcionais com melhor desempenho com outro silano não-funcional, designado como 1,2-bis(trietoxilsilil)etano (BTSE). Esta combinação teve por finalidade produzir camadas duplas de silanos para proteger o aço-carbono. As variáveis independentes estudadas foram a combinação entre as camadas de BTSE e do silano funcional, além das condições de hidrólise, temperatura e tempo de cura destes filmes. As variáveis dependentes ou resposta utilizadas foram: a impedância real a 0,03 Hz, obtida no ensaio de EIE, e a densidade de corrente de corrosão, originada das medidas de Resistência de Polarização Linear. Dentre as várias alternativas testadas, os melhores resultados foram apresentados pela combinação de camadas de BTSE com bis-(g-trimetoxisililpropil)amina (BTSPA) e BTSE com VS (viniltrietoxisilano) onde a primeira combinação determinou uma redução da ordem de 95% na velocidade de corrosão em relação a uma chapa sem tratamento e uma perda de espessura da ordem de 70% menor que um corpo-deprova revestido apenas com uma camada convencional de fosfatização. O BTSPA já na seleção inicial havia demonstrado excelentes resultados de proteção apenas como película monocamada, tendo seu desempenho melhorado consideravelmente em conjunto como o BTSE. Na segunda combinação, a velocidade de corrosão foi 90% menor do que num corpo-de-prova desprotegido e até 40% menor do que num corpo-de-prova revestido com uma camada de fosfato.The aim of this thesis was the investigation performance of organo-silane layers on mild steel, similar to that used in car bodies in automotive assembly plants. The electrochemical impedance spectroscopy (EIS) and the polarization resistance (Rp) were used as tools to evaluate the resistive layers properties and the substrate corrosion rate, respectively. Several non-functional and functional silanes were evaluated under different experimental conditions. Preliminary testing was conducted in order to select the silane with best performance as monolayer protection. Based on this preliminary performance results and supplementary information from papers, new tests were conducted using a design of experiments (DOE), combining the best functional monolayers silanes with the non-functional silane 1,2- bis(triethoxylsilyl)ethane (BTSE). This combination had the intention to produce double-layers silane films to protect the mild steel. The independent variables tested in DOE were: combination between the BTSE and the functional silane layers, hydrolysis parameters, temperature and the time film curing. The real impedance values at 0,03 Hz, obtained in the EIE tests, and the polarization resistance were taken as response (dependent) variables to evaluate the design. Among the different alternatives, the best results were presented by combining the BTSE layer with the BTSPA (bis-(g trimetoxysilylpropyl)amine layer and BTSE layer with VS (vinyl triethoxy silane) layer. The first silanes combination had shown a 95% decrease in corrosion rate when compared to a non-treated sheet and a thickness loss 70% lower than on a specimen coated with ordinary phosphate layer. Already in the initial selection the BTSPA did show excellent protection results just as monolayer film, and its performance increased significantly when applied together with BTSE. The second silanes combination, had presented a 90% decrease in corrosion rate when compared to a non-treated sheet and a thickness loss 40% lower than a specimen coated with ordinary phosphate layer.
12
Madsen, Jesse. "Doe v. Unocal: An Ambiguous Standard for Multinational Corporate Liability." Honors in the Major Thesis, University of Central Florida, 2003. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/690.
Full textAbstract:
This item is only available in print in the UCF Libraries. If this is your Honors Thesis, you can help us make it available online for use by researchers around the world by following the instructions on the distribution consent form at http://library.ucfBachelors
Health and Public Affairs
Legal Studies
13
Guerreiro, Luís Filipe Costa. "Automatic drilling improvement and standardization by design-of-experiments (DOE)." Master's thesis, Universidade de Évora, 2019. http://hdl.handle.net/10174/25737.
Full textAbstract:
Na manufactura aeroespacial,para um dado intervalo de tempo imposto,os requisitos de
qualidade têm de ser cumpridos.O custo operacional tem um pesado impacto,especial
mente em operações repetidas,como a operação de furação decompósitos na indústria
aeroespacial.É realizado um estudo da furação em compósitos,em particular dos bordos
de ataque dos Estabilizadores dos jatos executivos Embraer Legacy 450/500 e Praetor
500/600. Este estudo consiste na análise do desempenho das máquinas pneumáticas
e introdução de máquinas semi-automáticas com parâmetros programáveis.Os dados
recolhidos nas operações de furação com diferentes parâmetros e aplicação do conceito
de Planeamento de Ensaios(hiper cubos Latinos)para uma análise eficiente,visam in
crementar o conhecimento sobre a furação,e de terminar os parâmetros mais adequados
para cada geometria de ferramenta.Neste contexto,aumentou-se a vida útil da broca; ABSTRAT: In aerospace manufacturing, for a given imposed time interval, quality requirements must be met. Operating costs have a significant impact, especially on repeated operations, such as the drilling of composites in the aerospace industry. A composite drilling study is carried out, in particular the leading edges of the Embraer Legacy 450/500 and Praetor 500/600 Executive Jet Stabilizers. This study is accomplished by a performance analysis of pneumatic machines and the introduction of semi-automatic machines with programmable parameters. The data collected in drilling operations with different parameters and the application of the concept of Design of Experiments (specifically Latin hypercubes) for an efficient analysis, aim to increase the knowledge about drilling, and to determine the most appropriate parameters for each tool geometry. In this context, the operational life of the drill was increased
14
Nakama, Hokamura Gabriela Keiko, Domínguez Roberto Mario Rivara, Ronceros Walter Sabino Sebastián, and Paucar Gustavo Daniel Yana. "Diagnóstico Operativo Empresarial (DOE) de la Empresa BSH Electrodomésticos SAC." Master's thesis, Pontificia Universidad Católica del Perú, 2016. http://tesis.pucp.edu.pe/repositorio/handle/123456789/8461.
Full textAbstract:
x, 146 h. : il. ; 30 cm.El presente diagnóstico detalla la Gestión Operativa de la Empresa BSH Electrodomésticos, fabricante de electrodomésticos de las marcas BOSCH y COLDEX en el Perú, en la cual se analiza las distintas etapas de las operaciones, así como la propuesta de valor de la misma teniendo como objetivo optimizar algunos procesos primarios (diseño del producto, fabricación de componentes metálicos y plásticos, mantenimiento). Estas propuestas se han logrado mediante la aplicación de diversas herramientas de gestión de operaciones (Lean, Kanban, JIT, TPM, entre otras), lo cual permitirá que los procesos en estudio disminuyan sus tiempos, reduzcan sus reprocesos, mejore el control de sus inventarios y reduzcan algunos costos operativos. La propuesta orientada en la etapa de desarrollo permitirá reducir los tiempos de implementación de nuevos productos y mejorar las etapas de implementación y puesta en producción de éstos desarrollos, reduciendo el tiempo utilizados por demoras o análisis de tareas no planificadas. En la etapa productiva se realizó la evaluación y propuesta de mejora en los procesos que son restrictivos de la cadena de valor, lo cual permitirá que todo el sistema de producción se desarrolle de mejor manera, incorporando técnicas de gestión que permitan desarrollar el mantenimiento preventivo, reduzcan los inventarios y minimicen las perdidas por desabastecimiento de componentes o defectos de máquinas y equipos. Por ello, se propone ampliar las prácticas en estandarización de procesos y de mantenimiento productivo total hacia los procesos, máquinas y equipos que se encuentran definidos como no críticos. El alcance del análisis está dado para la fábrica de refrigeradores, dado que la corporación BSH considera como unidades de negocio independientes a las fabriles y comerciales. Finalmente se recomienda ampliar el diagnóstico operativo incluyendo un análisis de costos de fabricación y de planeamiento estratégico
This diagnostic details the operational management of BSH Home Appliances, manufacturer of appliances of BOSCH and COLDEX brands in Peru, many stages of operations are analyzed, the value proposition it aiming to optimize some primary processes (product design, manufacture of metal and plastic components, maintenance). This proposal have been achieved through the implementation of several operations management tools (Lean, Kanban, JIT, TPM, etc), which allow processes to reduce their study time, rework, improve inventory control and reduce some operating costs. The proposal aimed at the development stage will reduce implementation times for new products and improve the stages of implementation and production of these developments, reducing the time used by delays or unplanned task analysis. In the production stage was held the evaluation and proposal improvement of the processes that are restrictive of the value chain, which will allow the entire production system develops better incorporating management techniques in order to develop preventive maintenance, reduce inventories and minimize losses due to shortage of components or machinery breakdowns. For this reason, it is proposed expand, inside the factory, the standardization process and total productive maintenance practise to processes, machines and equipment that are defined as not critical. The scope of the analysis is given for the refrigerator factory, since the BSH Corporation consider as independent business units to the manufacturing and trade. Finally we recommend to include fabric costs into the present diagnostic and strategic planning
Tesis
15
Almeida, Ivan Alves de. "Otimização do processo de usinagem de titânio com laser pulsado de neodímio." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-13062008-162120/.
Full textAbstract:
Um requisito do processo de manufatura é a necessidade de se obter peças processadas, caracterizadas pela boa qualidade de acabamento superficial, baixa rugosidade e a conservação de suas propriedades metalúrgicas. Essas condições motivaram o desenvolvimento deste estudo, no qual selecionou-se o processamento de materiais a laser para o corte do titânio, unindo uma tecnologia a um metal de recente aplicação. Além disso, a versatilidade e as vantagens, como também a tendência global do setor industrial, tornaram-se fatores preponderantes na utilização do laser como ferramenta de usinagem. Neste presente trabalho foram investigados os efeitos da usinagem por laser pulsado de Nd:YAG sobre a qualidade, como também a formação de fases na superfície de corte e analisados pela aplicação do planejamento experimental. Para isso, chapas de titânio comercialmente puro (grau 2) e da liga Ti-6Al-4V (grau 5), com espessuras de 0,5 e 1,0 milímetros, foram empregadas na realização dos ensaios sob ação do laser. As amostras obtidas foram analisadas por microscopia ótica (MO), microscopia eletrônica por varredura (MEV), ensaios de microdureza e inspeção superficial da rugosidade. Capturaram-se digitalmente as imagens do material ressolidificado, aderido na superfície de corte para determinação da formação de rebarbas. Com base nestes dados construíram-se arranjos fatoriais, por meio da metodologia de planejamento experimental (DOE), a fim de avaliar o grau de influência dos parâmetros e suas possíveis interações e assim averiguar sua significância estatística. Verificou-se um endurecimento superficial na região do corte a laser com nitrogênio, em virtude da formação de nitretos (TiN) sob uma fina camada da zona de ressolidificação. Apesar da complexidade das interações entre os diversos parâmetros envolvidos no processamento a laser, os resultados corroboram que a otimização do processo de corte a laser do titânio pode ser factível.The main goal of this work was to establish the requirements for laser processed parts to satisfy uniform surface finish, low roughness and preservation of the mechanical and functional properties of the parts. Lasers became a versatile machining tool that satisfies the modern trends in material processing. In this study, the cutting quality factors of sheets of pure titanium and its alloys, by pulsed Nd:Yag laser, were investigated according to the Design and Analysis of Experiments. Laser pulse energy, laser pulse length, pressure of the protective/reactive gas, cutting speed, were considered the key laser parameter processing factors. In this Design, a factorial arrangement, regarding several combinations of these different processing factors, was performed and the influence of each one was also taken into consideration. The cutting process was performed on commercially pure titanium (grade 2) and the alloy Ti-6Al-4V (grade 5) sheets. The obtained samples were analyzed through optical microscopy in order to determine the edge roughness formations. The samples were also analyzed by scanning electron microscopy and submitted to micro hardness tests and surface roughness inspections. An increase on the surface hardness on the cut region and the formation of nitrogen precipitates under a thin layer of a melted zone were verified. In spite of the complexity of the interactions between this diversity of parameters, it is possible to optimize the titanium laser cutting.
16
Sebastián, Soto Niflin Roger. "Aplicación de la termografía en el mantenimiento predictivo - DOE RUN PERÚ." Universidad Nacional de Ingeniería. Programa Cybertesis PERÚ, 2006. http://cybertesis.uni.edu.pe/uni/2006/sebastian_sn/html/index-frames.html.
Full text
17
Mayer, Thomas [Verfasser]. "Optimale, routenbasierte Versuchsplanung (R-DoE) zur Charakterisierung technischer Systeme / Thomas Mayer." Kassel : Kassel University Press, 2016. http://d-nb.info/1109081618/34.
Full text
18
Rojas, Espinoza Wilbert. "“CONSTRUCCION: SALA ELECTRICA ALMACENES Y DEPOSITOS PLANTA Cu DOE RUN La Oroya”." Universidad Ricardo Palma. Programa Cybertesis PERÚ, 2009. http://cybertesis.urp.edu.pe/urp/2009/rojas_w/html/index-frames.html.
Full text
19
Bloot, édina Lurdes. "Avaliação do uso de delineamento de misturas na formulação de massas cerâmicas multicomponentes." Universidade do Estado de Santa Catarina, 2010. http://tede.udesc.br/handle/handle/1773.
Full textAbstract:
Made available in DSpace on 2016-12-08T17:19:37Z (GMT). No. of bitstreams: 1
Pre-textuais.pdf: 231387 bytes, checksum: 8e1d470bc2d14f949a6791e2c5439b59 (MD5)
Previous issue date: 2010-07-16Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
The response surface methodology applied to the technique of mixture experiments has been widely used in many fields of science and technology. The fundamental consideration is that a certain property depends on the component proportions, which constitute a material. The present work used the technique of mixture experiments to obtain multicomponent ceramic bodies suitable for the manufacture of ceramic tile products. In order to justify and correlate the results, the effects of structural and microstructural aspects of the green and fired materials on the final products properties were analyzed. The experimental procedure is comprised of a qualitative and quantitative understanding of the characteristics of raw materials, which constitutes the ceramic body, namely clays A and B, kaolin C, filliti D and E; a mixture design using a multicomponent mixture experiment; and a powder technology processing. The analysis of variance confirmed the significance of the models, but the variability coefficient R² indicated the influence of other factors on the studied properties than the raw materials. Additional experiments were conducted to validate the models. The models used did not allow an estimation of the properties to other compositions, which can be justified by the lack of replicas. The structural and microstructural characteristics, specially, crystalline and amorphous phases, and porosity, present in the green and sintered ceramic bodies, could be related to the properties, both measured and estimated according to the models. We obtained a range of formulations for ceramic tiles Category porous and semi-porous in terms of results. To obtain other types of ceramic tile as porcelain tile, new studies should be performed in processing conditions closer to those used in the coating industry, using new formulations.
A metodologia de superfície de resposta aplicada às técnicas de experimentos com mistura tem sido muito utilizada em várias áreas da ciência e tecnologia. A consideração fundamental é que uma determinada propriedade depende da fração dos componentes que constituem o material. O presente trabalho usou a técnica de experimentos com misturas para a obtenção de massas cerâmicas multicomponentes, destinadas a fabricação de revestimentos cerâmicos, visando a avaliação do uso da técnica de delineamento de misturas para composições utilizando cinco matérias-primas cerâmicas. A partir dos resultados da caracterização das massas cerâmicas obtidas e dos corpos-de-prova a verde e sintetizados, foram encontradas equações de regressão para as principais propriedades tecnológicas, como uma função dos componentes das misturas. A análise de variância confirmou a significância dos modelos, porém o coeficiente de variabilidade R² indicou a influência de outros fatores sobre as propriedades estudadas que não as matérias-primas. Foram realizados experimentos adicionais para a validação dos modelos, observou-se que os modelos utilizados não possibilitaram uma estimativa das propriedades para outras composições, o que pode ser justificado pela falta de réplicas. Entretanto as características microestruturais do material cerâmico obtido puderam ser correlacionadas com as propriedades medidas, justificando os resultados observados. Além disso, foi possível obter uma gama de formulações para revestimentos cerâmicos da categoria poroso e semi-poroso do ponto de vista das propriedades estudadas. Para obtenção de outras categorias de revestimento cerâmico como os porcelanatos, devem ser realizados novos estudos em condições de processamento mais próximas as utilizadas na indústria de revestimento, e utilizando novas formulações.
20
Adriaansens, C. A. "Juridische aspecten van zelfwerkzaamheid in huurwoningen." Deventer : Maastricht : Kluwer ; University Library, Maastricht University [Host], 1985. http://arno.unimaas.nl/show.cgi?fid=12842.
Full text
21
KARIMSHOUSHTARI, MILAD. "Design of Experiments for Nonlinear System Identification." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2751496.
Full text
22
Rojas, Espinoza Wilbert. "Construcción Sala Eléctrica Almacenes y Depósitos Planta Cu DOE RUN La Oroya”." Bachelor's thesis, Universidad Ricardo Palma, 2009. http://cybertesis.urp.edu.pe/handle/urp/171.
Full textAbstract:
El proyecto contempló la construcción de una Sala Eléctrica, Almacenes y Depósitos que se convertirá en poco tiempo en el lugar principal de los controles eléctricos y de acopio y distribución de diversos tipos de insumos utilizados en el procesamiento de las actividades metalúrgicas del complejo.
23
Ndoping, Beatrice. "Reproductive capacity in the pubertal and post parturient doe rabbit in Cameroon." Thesis, University of Aberdeen, 1997. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU603185.
Full textAbstract:
The aim of the current study were two fold; Firstly to establish the mechanism and timing of occurrence of fertility parameters associated with the onset of puberty and to investigate the effects, mechanisms and mode of action of restricted energy intake on growth rate, and age at puberty. Secondly, to study the effects of mating at different intervals post-partum on early fertility parameters and to identify the fertility parameters affected by early remating in three breeds of rabbits - the Local Cameroonian, the Californian and the New Zealand. The effects of two energy levels of intake on the onset of puberty were investigated. The results showed that restricted energy intake had no effect on mating behaviour but that, a critical level of oestradiol 17? was necessary to render the pituitary sensitive to GnRH following mating. It also revealed that the effects of nutrition on fertility parameters at puberty were mediated through the body weights achieved. Both a critical concentration of oestradiol 17? and another non-ovarian factor, probably of nutritional origin may be necessary for ovulation to occur. Experiment 2 provided data for pre- and post-implantation losses at different ages in does fed one of the two test diets. The results showed that after 19 weeks of age and above 1.8 kg body weight, growth rate had no effect on the proportion of does mating or ovulating and that, as does grew older there was an increase in metabolic resistance to restricted feed intake, whereby energy partitioning could have been altered giving preference to reproduction. Dietary energy intake had a negligible effect on corpus luteal function as reflected by progesterone profiles. The results also suggest that, most of the losses occurring prior to implantation were probably incurred during the very early period following mating (1-4 days), and were more likely to be related to fertilising ability than progesterone concentration. In experiment 3, the effect of altering the remating interval on early fertility parameters was investigated. Ninety-six does of the Local Cameroonian breed and 48 New Zealand white does were tested for mating 1, 7, 14, 21, 28 and 35 days post-partum one hour after blood samples had been collected to be analysed for oestradiol 17?. Does were slaughtered on the day of mating to assess the number of follicles of diameter > 1 mm and 2 days post-mating to assess ovulation response and rate. Receptivity increased with day of testing for mating post-partum with the highest response on day 1 and the lowest at 21 days post-partum. No correlation existed between follicles (> 1 mm) and day of mating post-partum. (r=0.03). Serum oestradiol 17? concentrations were not significantly different (p>0.05) on any day of mating, although the concentrations tended to be higher on day 1 post-partum. There was a te The overall results of this study reveal that besides the inherent reproductive characteristics of the doe rabbit, poor management practices as well as the high environmental temperatures characteristic of the tropics, could be responsible for the poor reproductive efficiency of the doe rabbit in Cameroon.
24
Morlando, Rebecca A. "Chemchar gasification of metal-bearing wastes, chlorinated organics and doe surrogate wastes /." free to MU campus, to others for purchase, 1997. http://wwwlib.umi.com/cr/mo/fullcit?p9841325.
Full text
25
Chini, Marco. "Sviluppo di nuove metodologie di calibrazione per motori da competizione con tecniche di Design of Experiments." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18647/.
Full textAbstract:
Lo scopo di questa tesi è quello di creare dei modelli di risposta di alcune grandezze fisiche di un motore da competizione, partendo dalla progettazione dell'attività di acquisizione dati al banco prova, per arrivare a dei risultati numerici che descrivano nel modo più fedele possibile il comportamento del motore e, dove possibile, andare a ottimizzarne le prestazioni e l'affidabilità.
26
Rådberg, Malin. "Design of Experiment for Laser cutting in Superalloy Haynes 282." Thesis, Karlstads universitet, Science, Mathematics and Engineering Education Research (SMEER), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-44516.
Full textAbstract:
This project aims to investigate the effect of varying different laser cutting parameters on the laser cut surface. The parameters that were varied were cutting speed, beam effect, gas pressure and focal point. The statistical method Design of Experiment was used to plan the experiments and two full factorial test plans were set up, one with argon as cooling and protective gas and one with nitrogen. Sheet metal consisting of the superalloy HAYNES ® 282 with a thickness of 2,54 mm was investigated. Samples from the material were cut with different laser cutting parameters according to the test plans. The samples were evaluated by measuring cracks, recast layer thickness, surface irregularity, burr height and distance to beam deflection point on the cut surface. The resulting data was inserted as responses into the statistical program Modde 10.1 for analysis. Modde 10.1 provided models of high significance for the responses of Recast layer, Tav; Recast layer, Tmax; Burrheight, max and Distance to deflection point for the argon series and Recast layer, Tav and Recast layer, Tmax for the nitrogen series. The results showed that both recast layer thickness and burr height decreases with increased values of cutting speed, gas pressure and focal point as well as decreased values of beam effect within the parameter window investigated. They also showed that distance to deflection point increased with increasing values of gas pressure and focal point and with decreased values of cutting speed and beam effect within the parameter window. The results also showed that for the samples cut with argon as cooling and assistant gas the parameters that affects the recast layer thickness the most are focal point and gas pressure, whereas for the nitrogen series it is gas pressure and beam effect. The parameter with greatest effect on burr height is the cutting speed and for the distance to deflection point it is focal point and gas pressure that have the greatest effect. When comparing the argon and the nitrogen series to each other it can be seen that the argon series generate less recast layer from the entry of the cut until between 60 – 80 % into the cut, after which the argon series bypasses the nitrogen series in amount of recast layer produced in the cutting process in the majority of the places measured.Projektet syftar till att undersöka effekten på den laserskurna ytan då laserskärningsparametrar varieras. Parametrarna som varierades var skärhastighet, lasereffekt, gastryck och fokalpunkt. Den statistiska metoden Design of Experiments användes för att planera experimenten. Två stycken fullskaligt faktoriella försöksplaner skapades, en med argon som skärgas och en med kväve som skärgas. Undersökningen gjordes på plåt bestående av superlegeringen HAYNES ® 282 med en tjocklek på 2,54 mm. Provbitar från materialet skars ut utifrån försöksplanerna med olika laserinställningar under skärprocessen. Provbitarna utvärderades genom att mäta sprickor, tjockleken på det omsmälta materialet, ytojämnheten, gradhöjden och avståndet till laserstrålens avböjningspunkt på den laserskurna ytan. Resultaten användes för analys i det statistiska programmet Modde 10.1. Modde 10.1 bidrog med modeller av hög signifikans för responserna Recast layer, Tav; Recast layer, Tmax; Burrheight, max and Distance to deflection point för argonserien och Recast layer, Tav och Recast layer, Tmax för kväveserien. Resultaten visar att både tjockleken på omsmält material och gradhöjden avtar med ökande värden på skärhastighet, gastryck och fokalpunkt samt minskande värden på lasereffekt inom det undersökta parameterfönstret. De visade också att till laserstrålens avböjningspunkt på den laserskurna ytan ökade med ökande värden på gastryck och fokalpunkt och med minskande värden på skärhastighet och lasereffekt inom parameterfönstret. Resultaten visade också att de parametrar som i störst utsträckning påverkar tjockleken på det omsmälta materialet för provbitarna i argonserien är fokalpunkt och gastryck, medan det för kväveserien är gastryck och lasereffekt. Parametern som har högst inverkar på gradhöjden är skärhastigheten, medan fokalpunkt och gastryck har störst effekt på avståndet till laserstrålens avböjningspunkt på den laserskurna ytan. Om kväveserien och argonserien jämförs med varandra kan det observeras att argonserien generellt genererar mindre omsmält material än kväveserien från det att laserstrålen träder in i materialet till dess att den är mellan 60 och 80 % in i snittet, vartefter argonserien går förbi kväveserien i mängd omsmält material på majoriteten av mätställen.
27
Brown, William E. III. "Development Of Design Equations For A Square-tube Subbase Supporting A Shaft-mounted Speed Reducer." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/30983.
Full textAbstract:
Shaft mounted speed reducers are used in material handling applications, such as conveyor systems for transporting ore out of mine shafts. A subbase joins the reducer with an electric motor, and serves to limit the misalignment between the motor shaft and the reducer input shaft. The entire assembly is supported at two points: the axis of rotation of the reducer output shaft, which is fixed, and a clevis-pin joint under the motor, which prevents rotation of the assembly about the reducer output shaft axis.
In an effort to reduce the production and material costs of subbases that support shaft mounted reducers, Rexnord Corp. is implementing subbase designs that are lighter weight and easier to manufacture than current designs. Impeding the implementation of lower cost designs is the lack of an equation to properly choose subbase dimensions for acceptable values of shaft misalignment. Trial and error in subbase construction may provide designs that give acceptable results for misalignment. Given an equation, however, the weight could be minimized while still limiting misalignment at the coupling location. The project goal is to provide equations that give shaft misalignment as a function of three subbase parameters: tube thickness, mounting strap width, and end cap thickness.
Developing design equations by analytical methods is investigated first. Next, finite element models are used to check the analytical results for accuracy. Finally, finite element models are used to perform design sensitivity studies where needed. The final equations for misalignment are given as functions of the three design variables.Master of Science
28
Choi, Paul Koon Ping. "The use of design of experiments (DOE) : time for company management to decide." Thesis, University of the West of Scotland, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556176.
Full textAbstract:
Many corporations over the world showed evidence of getting positive benefits from using design and analysis of experiments (DOE), however, some others did not. Companies did not use DOE or failed in using it (for some reasons) might lose their opportunities of getting those benefits which their counterparts received. Despite the advantages of. DOE, the technique is not commonly used by management. The purpose of this research is to investigate why the technique is not applied more often and hence suggestions are made to help rectify the situation. The research covered four main stages: literature review, samples of representative literature, questionnaire survey via the Internet and a case study using action research methodology being carried out in a printed circuit board company in Hong Kong. Triangulation was used in this research in order to uncover knowledge about the topic of study and tradeoff bias caused. A random sampling method and a judgmental sampling method were used in the samples of representative literature. Subsequently, two questionnaire surveys via the Internet were respectively conducted. The snowball sampling method was used to contact targeted companies. Data and information received from the surveyed companies on the use, or not, of DOE were collected and analyzed. The results and findings of the two questionnaire surveys indicated of what, how and why companies use, or not use, of DOE in their operations. A case study using action research methodology was also carried out in a local company. The action research was three-fold: (I) the researcher (i.e. the author) conducted DOE training to a team of staff, (2) trained staff undertook a current industrial problem and resolved it by using DOE, and (3) the company changed from the state of 'non-use of DOE' to the one of 'use of DOE' for better performance practices. Feedbacks from top management and the staff enriched the researcher to answer the posed research questions and achieved the objectives of the whole study.
29
Farias, Marcelo Fernandes. "Determinação da influência de parâmetros de processo de forjamento a quente utilizando DOE (projeto de experimentos)." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/170979.
Full textAbstract:
Atualmente o Projeto de Experimentos (DOE) vem sendo largamente utilizado para determinar os fatores de projetos e processos mais significativos afetando uma variável resposta e para estabelecer modelos empíricos entre os fatores, entretanto este método ainda é pouco utilizado e processo de forjamento a quente. O presente trabalho analisa a influência individual e cumulativa de alguns parâmetros controláveis de um processo de forjamento a quente em matriz fechada na força de prensagem necessária para sua realização. Esta análise foi realizada utilizando a técnica de Projeto de Experimentos (DOE). Para a determinação da influência dos parâmetros de processo selecionados na variável resposta do Projeto de Experimentos (DOE), uma série de ensaios variando o lubrificante utilizado, o diâmetro da geratriz e a temperatura de forjamento foram realizados. A variável resposta para o experimento foi definida como a força de prensagem exigida do equipamento para a realização do forjamento. Para este trabalho foi utilizado o material ABNT 4140 fornecido em barras trefiladas de 28,6mm (1.1/8″) posteriormente forjado a quente em matriz fechada. Os resultados mostraram que o fator que mais influencia na força de prensagem para a situação ensaiada é o lubrificante. Os demais fatores, mesmo combinados, não apresentaram uma influência significativa na variável resposta. O presente estudo demonstra que é possível a utilização de técnicas de ajuste e definição de parâmetros de processo de forjamento a quente de maneira confiável e sem a necesside da aplicação dos complexos programas de simulação computacional e os métodos de tentativa e erro ainda presentes na indústria. Finalmente este trabalho reforça a versatilidade do Projeto de Experimentos (DOE) ainda pouco aplicado em processos de forjamento.Nowadays the Design of Experiments (DOE) has been widely used to determine the most significant project and process factors affecting a response variable and to establish empirical models among the factors, although this method is still little used and the process of hot forging. This work analyzes the individual and cumulative influence of some controllable parameters in a closed die hot forging process in the pressing force required for its realization. This analysis was performed using a Design of Experiments (DOE) method. To determine the influence of variable factors selected in response Design of Experiments (DOE), a several tests varying the lubricant, the diameter of the billet and the forging temperature was performed. The response variable for the experiment was defined as pressing force. For this study, it was used the ABNT 4140 steel provided in drawn bars of 28,6mm (1 1/8 ″). The fator that had more influence over the pressing force was the lubricant. Other factors, whether or not combined, did not show a significant influence on the response variable. This study demonstrates that it is possible use techniques to set hot forging process parameters reliably and without necesside the application of complex computer simulation programs or the trial and error system. Finally, this work reinforces the versatility of Design of Experiments (DOE) wich is still little used in forging processes.
30
Schlickmann, Marcelo Niehues. "Avaliação da influência dos parâmetros do processo de soldagem TIG sobre a qualidade de uma peça fabricada em aço elétrico silicioso." Universidade do Estado de Santa Catarina, 2010. http://tede.udesc.br/handle/handle/1763.
Full textAbstract:
Made available in DSpace on 2016-12-08T17:19:35Z (GMT). No. of bitstreams: 1
0 - Capa.pdf: 49375 bytes, checksum: a82e2fca3ff3a4c1780c4fe39da86057 (MD5)
Previous issue date: 2010-07-05Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
The TIG welding process (Tungsten Inert Gas), also known as GTAW (Gas Tungsten ArcWelding), is the most commonly used process for welding of thin plates where there is a need for an excellent control of the temperature applied on the piece. This paper presents a study carried out in partnership between the Department of Graduate Studies in Scienceand Materials Engineering and the Department of Industrial Engineering and Stamping of WEG Equipamentos Elétricos S.A Motors Division. It elaborates on the use of the experimental methodology DOE to investigate the influence of TIG welding process parameters, electrical current, welding speed and flow of the shielding gas on the quality of a piece fabricated with silicon electrical steel - ABNT 50F 466M, best known for its 50A 400 specification on the JIS standard. The first step of the study was the designing of the experiment to obtain welded pieces with different combinations of the parameters above mentioned and enable the evaluation of mechanical strength, fillet weld size, hardness and metallographic analysis of the test specimens. The information obtained with analysis of variance techniques (ANOVA) showed that the change in the levels of electrical current and welding speed promotes significant changes in final results. Furthermore, the different rates of gas flow tested caused no differences in response variables of the study. As a result, it was also possible to determine the combinations of these parameters that ensure the required quality and provide increased productivity, energy saving and reduced consumption of the shielding gas.
O processo de soldagem TIG (Tungsten Inert Gas), também conhecido como GTAW (Gas Tungsten Arc Welding), é o processo mais utilizado para a soldagem de chapas finas onde um excelente controle do aporte térmico à peça é necessário. Nesta dissertação é presentado um estudo realizado em parceria entre o Departamento de Pós-Graduação em Ciência e engenharia dos Materiais e os Departamentos de Engenharia Industrial e Estamparia da WEG Equipamentos Elétricos S.A. - Motores. Esse estudo envolveu a utilização da metodologia de delineamento experimental DOE para investigar a influência dos parâmetros do processo de soldagem TIG, corrente elétrica, velocidade de deslocamento da tocha e vazão do gás de proteção, na qualidade de uma peça fabricada com aço elétrico silicioso ABNT 50F 466M, mais conhecido pela classificação 50A 400 da norma JIS. Inicialmente foi elaborado o planejamento do experimento a fim de obter peças soldadas com diferentes combinações dos parâmetros acima mencionados e possibilitar a avaliação da resistência mecânica, dimensão dos cordões de solda, dureza e análise metalográfica dos corpos de prova. Os resultados obtidos, com o auxílio da técnica de análise de variância (ANOVA), mostraram que mudanças nos níveis de corrente e na velocidade de soldagem promoveram alterações significativas nos resultados. Por outro lado, as diferentes taxas de vazão de gás testadas não provocaram diferenças nas variáveis de resposta do estudo. Também foi possível determinar as combinações desses parâmetros que garantem a qualidade requerida e proporcionam aumento de produtividade, economia de energia elétrica e redução no consumo de gás de proteção.
31
Harl, Audra Whitney. "Comparison of short-term vs. long-term estrous synchronization protocols using CIDR devices in sheep and goats during and outside the natural breeding season." Thesis, Kansas State University, 2014. http://hdl.handle.net/2097/18288.
Full textAbstract:
Master of ScienceDepartment of Animal Science and Industry
David M. Grieger
Controlling reproductive cycles during active cyclicity and seasonal anestrous in small ruminants is critical for profitability. The objective of this study was to evaluate the effect on estrous response and interval to estrus of two CIDR protocols in sheep and goats during breeding and non-breeding seasons. In experiment 1, 133 ewes were randomly assigned to 1 of 3 treatments during the breeding season. In the CIDR-7 group, ewes received a CIDR insert for 7 d. In the CIDR-7 + PGF treatment, ewes received a CIDR insert for 7 d and 20 mg of prostaglandin-F[subscript]2[subscript]α (PGF[subscript]2[subscript]α) upon CIDR removal. Ewes in the CIDR-14 treatment received a CIDR insert for 14 d. Following CIDR removal all ewes were exposed to a ram every 12 h until breeding. There was a shorter interval from CIDR removal to estrus in the CIDR-14 treatment compared to the CIDR-7 and CIDR-7 + PGF treatments (P<0.05). There was no difference in number of ewes per treatment displaying estrus. In experiment 2, 54 ewes were randomly assigned to one of two treatment groups during the anestrous season. Ewes in CIDR-7 and CIDR-14 treatments received a CIDR insert for 7 d and 14 d, respectively. Upon CIDR removal ewes were exposed to a ram every 12 h until breeding. There was a significantly shorter interval from CIDR removal to estrus in CIDR-14 ewes when compared with CIDR-7 ewes (P<0.05). For experiment 3, 37 Boer does were randomly assigned to one of two treatments. In the CIDR-10 treatment, does received a CIDR insert for 10 d and 20 mg of PGF[subscript]2[subscript]α at time of CIDR removal. In the CIDR-19 treatment, does received a CIDR insert for 19 d. Upon CIDR removal, does were exposed to a buck fitted with a marking harness and chalk marks were recorded every 12 h. The number of does displaying estrus was not different (CIDR-7, 85%; CIDR-14, 95%). There was no difference in interval from CIDR removal to estrus between treatments. Results from experiments 1 and 2 supported the hypothesis that long-term protocols yield a shorter interval to estrus when compared with short-term protocols.
32
Barnes, Andrew Charles. "Development of a Wire Bonding Process for Microsystems Fabricated From Polyvinyl Acetate - Nanocomposite." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1302118642.
Full text
33
Lindberg, Tomas. "An application of DOE in the evaluation of optimization functions in a statistical software." Thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-39507.
Full text
34
Sodiq, Akhmad. "Doe productivity of Kacang and Peranakan Etawah goats and factors affecting them in Indonesia." Kassel : Kassel Univ. Press, 2004. http://deposit.d-nb.de/cgi-bin/dokserv?idn=972035273.
Full text
35
LE, BIHAN THOMAS. "Accuracy of PSA's DPF soot load estimator calibrated by means of a DoE model." Thesis, KTH, Maskinkonstruktion (Inst.), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145030.
Full textAbstract:
The combustion process happening in the Diesel engine is naturally producing soot. These soot emissions have been known for being harmful for both our environment and especially our health. Aware of this situation, the governments worldwide have defined emission limits for our vehicles. These emission regulations are continuously revised and have become harder and harder for the car manufacturers to reach. In that context, PSA has introduced in 2000 the Diesel Particulate Filter in the automotive industry (on a large scale).The DPF technology chosen by PSA requires a constant monitoring of the soot load in the filter. This monitoring is done by a module which estimates in real time the soot amount emitted by the engine and the self-regenerated part at the same time. In order to work properly, this module needs to be previously calibrated on an engine test bench. This solution has shown great results so far but the time needed in the test cell for the calibration is very long.An idea is then to use an engine model obtained by means of a Design of Experiment. This kind of model is able to provide us with data such as fuel consumption or pollutant emissions in a certain range of operating points. Nowadays, DoE engine models are used in the engine tuning phase which occurs before the soot load estimator is calibrated. The available engine model was consequently utilized to simulate the tests originally done in the test cell and results of the simulations used to calibrate the soot load estimator of the DPF. A potential problem of this method was that the engine operating points asked to the model would be close to its border of accuracy or even outside.6The results given by the model have first been compared to those provided by a real engine. Being close enough, data collected by the model have been used to calibrate the soot load estimator. This estimator was finally tested on real driving cycles. The accuracy of its load estimation was compared to the DPF weight (before/after) and promising enough for PSA to keep working in that direction after this thesis.
36
Cornils, Kristine N. (Kristine Norene). "Developing an economic development policy : the evolution and impact of a new DOE mission." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/35425.
Full text
37
Burgos, Cisneros Alonso. "Micro-hegemonía y relaciones micro-hegemónicas en el conflicto de Doe Run-La Oroya." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2011. https://hdl.handle.net/20.500.12672/15806.
Full textAbstract:
Publicación a texto completo no autorizada por el autorManifiesta que la investigación es es una aproximación inicial al estudio del problema de las relaciones de poder micro-hegemónicas entre los principales actores sociales que intervienen en el conflicto de La Oroya. Estos son el gobierno peruano, la empresa Doe Run Perú, sus trabajadores, la sociedad civil de La Oroya, las ONG y la iglesia católica. Este estudio se enmarca en el ámbito de la antropología política, en el análisis de las relaciones de poder vistas desde la perspectiva de los actores sociales, abordando la relación ideología-cultura. El trabajo de campo fue realizado en los meses de julio del 2009 y junio del 2011 en la ciudad de La Oroya (3750 msnm), provincia de Yauli, Región Junín, en la sierra central del Perú. Los métodos y técnicas utilizados fueron principalmente cualitativos, tomando como fuente directa las entrevistas en profundidad. Como fuentes indirectas se usaron notas de campo estandarizadas con datos recabados de algunos informantes como los pobladores de La Oroya, los comunicados emitidos por Doe Run, el gobierno peruano y los sindicatos de trabajadores de Doe Run Perú - La Oroya División. La muestra de informantes entrevistados comprende un total de diez trabajadores y dirigentes de los sindicatos (de los cuales a cuatro se entrevistó de manera individual y a seis en dos entrevistas colectivas), dos dirigentes de la sociedad civil, un representante de la iglesia católica (párroco de La Oroya) y un vocero de la empresa. A pedido de los informantes sólo se usan sus iniciales y no su nombre completo.
38
Caballero, Terrazas Luis Eduardo, and Vélez Fátima Milagros Pescoran. "Aplicación de herramientas Lean Manufacturing y DOE-Taguchi en una empresa de plásticos peruana." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/655123.
Full textAbstract:
La industria de plásticos se encuentra en un crecimiento progresivo a comparación de otros sectores, ya que la gran mayoría de las empresas tienen procesos automatizados. Es por esto que las empresas del sector se vuelven más competitivas cada día. Esta investigación se realiza en una empresa peruana en la que se detecta como problema principal la alta tasa de productos defectuosos, que impacta a su vez negativamente en un 4.37% del costo fabricación. Por ello y en base a diversos estudios sobre la implementación de herramientas y metodologías de solución y mejora, se propone la implementación de un modelo basado en la filosofía Lean Manufacturing con el método Taguchi para la reducción de estos, obteniendo como resultado un decremento del 60.41% en la tasa de defectos. Si bien el objetivo del proyecto es posicionar la empresa dentro del porcentaje estándar, se logra estar por debajo de este.The plastics industry is in progressive growth compared to other sectors since the vast majority of companies have automated processes. This is why the companies in the sector become more competitive every day. This investigation is carried out in a Peruvian company in which the high rate of defective products is detected as the main problem, which in turn negatively impacts 4.37% of the manufacturing cost. For this reason and based on various studies on the implementation of tools and methodologies for solution and improvement, the implementation of a model based on the Lean Manufacturing philosophy with the Taguchi method is proposed to reduce these, resulting in a decrease of 60.41 % in defect rate. Although the objective of the project is to position the company within the standard percentage, it is possible to be below this.
Trabajo de investigación
39
An, Sharon Heera. "Healing and Reintegrating in the City: Urban Infill as a Sanctuary for Jane Doe." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/99207.
Full textAbstract:
The sex trafficking industry is not only a social justice issue, but also an architectural issue.
In the same urban fabric where people live, work, and socialize, victims of commercial
sex trafficking live in the shadows, work in obscure environments, and isolate themselves
from others. National and local resources in mental care, job training, and legal support fail
to provide a holistic place of refuge for these displaced individuals. Current shelters that
specifically serve sexually exploited victims also face limitations in their presence in urban
neighborhoods, long-term availability, and types of living arrangements.
With a specific socioeconomic climate and disparity in San Francisco, Bayview presents itself
as an opportune place to provide refuge for both survivors of sexual exploitation and the
low-income community. Even as a distressed neighborhood, its ethnic diversity and existing
infrastructure would create a foundation for survivors to heal and reintegrate into a resilient
community. At an urban scale, ecological infrastructures provide environmental revitalization
from rising sea levels and economic restoration of industries significant to the neighborhood's
historical identity. The architectural intervention focuses specifically on female survivors of
sexual exploitation, ranging from youth to mothers with children, and how they would heal
together and reintegrate into the community.
Hand stitching is an integral part of this project's design process. It is a drawing medium that
reflects the physical engagement through a meditative activity. It is also a visual language
used to formulate spatial sequences, patterns, and movement. The mixed-use urban infill
weaves in sanctuaries to heal as an individual, as a camaraderie, and along with the greater
community. Residents dwell in the permanently supported community housing, where they
mend bodies, hearts, and relationships in the home. Other survivors are welcomed into the
drop-in facility, which provides initial resources like hygienic care and counseling. Retail spaces
along the main corridor are programmed to create a synergetic seam between residents
and their opportunities to participate in the neighborhood. Interior and exterior thresholds
throughout the building interlace the duality of veiled and transparent spaces. This cohesive
spatial journey would bind wounds, foster resiliency into the urban ecosystem, and ultimately
be reconciled to a dignified home, workplace, to social environment.Master of Architecture
Sex trafficking is a form of modern slavery. This inhumane industry is exacerbated in cities as more people move into the urban environment. In the same cities people live, work, and socialize, victims of commercial sex trafficking live in the shadows, work in obscure environments, and isolate themselves from others. Many sexually exploited victims receive limited care to recover from their physical, mental, and emotional wounds. Unfortunately, they are often grouped together with other displaced groups. This thesis calls out a specific group in need of healing, female survivors of sex trafficking, and considers a specific place where she can restore her sense of home, workplace, and community. The female survivor is given the name Jane Doe, and her unique narrative drives the types of spaces she needs to feel safe, loved, and cared for. The design proposal is sited in Bayview, an industrial urban neighborhood in southeastern San Francisco. The neighborhood at large is first reimagined to set a foundation for welcoming Jane Doe. Then, the proposed building integrates three types of spaces: a community housing, a drop-in center, and retail spaces with workshops. It is nestled amongst warehouses, houses, and other local shops. This thesis ultimately expresses the possibility architecture has in doing more than providing an inhabitable space. The architecture for Jane Doe is a sanctuary that plays a definitive role in healing her body, heart, and mind, as her sense of belonging is restored.
40
Bensenouci, Ahmed. "Étude de l'efficacité énergétique d'un batiment d'habitation à l'aide du logiciel de simulation DOE-2E." Mémoire, École de technologie supérieure, 2006. http://espace.etsmtl.ca/482/1/BENSENOUCI_Ahmed.pdf.
Full textAbstract:
Le but de ce mémoire de maîtrise est d'investiguer sur l'estimation de l'énergie utilisée dans le secteur de l'habitat. La capacité de prédire la consommation d'énergie est très utile durant toutes les étapes de la vie d'un bâtiment. Dans les nouvelles constructions, le coût de l'énergie prédit, associé aux différentes tâches de conception, peut inciter les propriétaires et constructeurs à prendre la meilleure décision concernant l'efficacité énergétique. Pareillement, l'estimation de la consommation d'énergie des bâtiments existants permet d'établir une stratégie de mesures d'économies énergétiques en agissant efficacement sur les éléments les plus énergivores.
L'utilisation de cette étude du logiciel DOE-2E et son interface EE4 a permis le développement d'un modèle de bâtiment existant et d'estimer sa consommation énergétique. Le cas étudié est validé en s'appuyant sur une comparaison entre les résultats estimés par le logiciel de calcul et l'énergie consommée réellement. Ce modèle pourra servir à l'évaluation de l'énergie utilisée des bâtiments en construction et existants. Au terme de cette recherche, une étude des paramètres sensibles est menée, donnant une illustration des éléments essentiels pouvant modifier facilement l'allure de la consommation d'énergie. Une intervention dans le bon sens sur ces éléments s'avère très fructueuse sur le plan énergétique.
41
Henriques, Francisco José da Silva. "O uso do DOE em conjunto com FTA no desenvolvimento e melhoria de projetos inovadores." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263938.
Full textAbstract:
Orientador: Auteliano Antunes dos Santos JuniorDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
Made available in DSpace on 2018-08-19T07:33:31Z (GMT). No. of bitstreams: 1 Henriques_FranciscoJosedaSilva_M.pdf: 2858744 bytes, checksum: 0cea615c3d9820b58bad6cb5d86648ee (MD5) Previous issue date: 2011
Resumo: O presente trabalho tem como objetivo apresentar e aplicar uma metodologia que possa ser utilizada nos diagnósticos de falhas, a priori, com causas desconhecidas ou diferentes das já conhecidas, por equipes de desenvolvimento de novos produtos. Esse tipo de falha acontece principalmente quando trata-se de produtos inovadores e ocorrem durante o processo de validação e mesmo após o início da produção. A metodologia se baseia na aplicação de Planejamento de Experimentos em conjunto com Árvore de Falhas para a quantificação das importâncias das causas raiz. Como resultado do trabalho é possível identificar quais parâmetros são os principais candidatos a causadores da falha e hierarquizar as causas. É possível ainda verificar as interações entre as causas, se existirem. A combinação entre métodos proposta pode ser inserida em metodologias de projeto consagradas, como o Projeto para Seis Sigma (DFSS), criando uma nova forma de desenvolver projetos inovadores
Abstract: The present work aims to present and apply a methodology that can be used on failures diagnosis, with unknown or different causes from those already known by the development team. This kind of failure happens mainly along the design of innovative products and occurs during the validation process or in the infant life phase. The methodology is based on Design of Experiments, which is applied together with Failure Tree Analysis to quantify the importance of each root cause. From the results of this work it is possible to identify what are the main causes related to the fault and rank them. It is also possible to verify whether there are interactions between the causes or not. The methodology proposed joining both methods can be inserted unusual design methodologies as Design of Six Sigma, creating a new way to develop and improve innovative designs
Mestrado
Mecanica dos Sólidos e Projeto Mecanico
Mestre em Engenharia Mecânica
42
Verlaan, Eric, Wouter Hendriksen, Rob Meulenbroek, and Prie Devlin du. "Design of Experiments (DOE) for Product and Process Improvements - 130: A Phenolic Syntan Case Study." Verein für Gerberei-Chemie und -Technik e. V, 2019. https://slub.qucosa.de/id/qucosa%3A34176.
Full textAbstract:
Content:
For sustainable developments the chemical industry is continuously looking for technical innovations with wide potential implications. The Design of Experiments (DOE) approach has been proven to be a powerful tool in determining the relationship between factors affecting certain output variables. This is done to establish a 'cause and effect' relationship and eventually realize output optimization. In order to evaluate whether DOE can be implemented for improving our products and processes, a case study, focusing on the synthesis and production of traditional phenolic syntans was carried out within our R&D department. Although we can influence properties by application, the effect a retanning agent has on leather originates to a large extent from the chemistry involved. To understand interactions and the possibilities of targeted improvements of the production process, a DOE factorial design approach was used to identify the control parameters and their interactions in our phenolic syntan recipes that influence the various properties and effects. Instead of trial-and-error or one-factor-at-a-time practices, DOE made it possible to limit the number of lab experiments to one third (1/3) of the amount needed for completing our study. As a result, a much deeper and more consistent understanding of the building blocks’ interactions and how these influence the chemical process of phenolic syntan synthesis has been gained. This includes the amount of different building blocks, their molar ratios as well as process conditions. Aiming at achieving optimal efficiency for various projects, right now we are looking at possibilities in implementing DOE within Smit & zoon.
Take-Away:
The Design of Experiments (DOE) approach is a powerful tool in realizing process and product improvements.
DOE factorial design can be used to identify control parameters and their interactions in a wide reage of (industrial) applications.
DOE has been proven to be efficient and effective in optimizing phenolic syntan recipes and production process.
43
Ahmed, Bensenouci. "Étude de l'efficacité énergétique d'un batiment d'habitation à l'aide du logiciel de simulation DOE-2E /." Thèse, Montréal : École de technologie supérieure, 2006. http://proquest.umi.com/pqdweb?did=1280149601&sid=2&Fmt=2&clientId=46962&RQT=309&VName=PQD.
Full textAbstract:
Thèse (M. Ing.)--École de technologie supérieure, Montréal, 2006."Mémoire de 24 crédits présenté à l'École de technologie supérieure comme exigence partielle à l'obtention de la maîtrise en génie mécanique". CaQMUQET Bibliogr.: f. [154]-155. Également disponible en version électronique. CaQMUQET
44
Linders-Nouwens, Joke. "Doe nooit wat je moeder zegt : Annie M. G. Schmidt, de geschiedenis van haar schrijverschap /." Amsterdam : Querido, 1999. http://catalogue.bnf.fr/ark:/12148/cb390003771.
Full text
45
Venturini, Giacomo. "Design of experiment analysis of air filter performance for helicopter applications." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Find full textAbstract:
Helicopters are used in different situations and in extremely various environments. Sometimes they land or take off to or from rough landing sites where dust, sand and other materials are present. One of the major problem for helicopters engine is the ingestion of these materials. This problem can be solved by using a filter positioned at the engine intake.
The filtration in helicopters is a recent development because, until recent times, research in this field was considered non-profitable and downplayed. Filtration is closely connected with engine efficiency and, in recent years, it has been seen that with a small investiment, helicopter performances were much better. A good filtration means less consumption and more perfomance.
This work is a part of a project conducted by BMC Air Filters, a company known worldwide for the production of high performance air filters and air induction systems. The goal of the main project consists in studying the optimization of the process in the design of filter elements for helicopters.
The two important features to evaluate an Inlet Barrier Filter are the pressure drop and the capture efficiency. In this work the first aspect is treated.
In the engineering design process, the experimentation plays an important role. In this thesis the Design Of Experiment (DOE) method is used to minimize the number of tests conducted, reaching several positive results. Indeed, in order to decrease the pressure loss, the two parameters to change are materials and geometric shape. Thus, two different materials of filter and several different filter geometric shapes are investigated through DOE, leading to identify the best design solution.
46
Holm, Jon. "Dynamiskt kvalitetsarbete för förbättring av glödgade kopparbands skydd mot missfärgning." Thesis, Linköping University, Department of Science and Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-9320.
Full textAbstract:
Luvata Sweden AB, Finspång, tillverkar tunna kopparband till fordons- och elektro-nikindustrin. Koppar har en förmåga att kemiskt reagera med den omgivande luften. Detta orsakar att kopparn missfärgas - det vill säga att metallen får en avvinkade färg. För att undvika att kopparn missfärgas under transport till kund, behandlas banden med ett missfärgningsskydd. Vid enstaka tillfällen fallerar dock detta skydd med missnöjda kunder och reklamationer som följd.
Syftet med detta examensarbete är att undersöka möjligheten att reducera problemet med missfärgning. Detta har gjorts genom att undersöka möjligheten att dels införa en nyutvecklad kontrollutrustning och dels genom att förbättra produktionsproces-sen.
Möjligheten att använda kontrollutrustningen för acceptanskontroll undersöktes grundligt. Parametrar som förekomsten av systematiska och slumpmässiga fel under-söktes. Dessa undersökningar visade att utrustningen inte är lämplig att användas som acceptanskontroll - dels för att utrustningen är svår att använda och ibland ger felaktiga resultat, men framförallt för att produktionsproverna generellt har så dåligt missfärgningsskydd att samtliga prover blir underkända.
Möjliga förbättringar av påverkbara parametrar i produktionsprocessen undersöktes. Detta utfördes med ett så kallat flerfaktorförsök (DoE). Undersökningarna visade att det finns parametrar som bör förbättras. Det är emellertid inte möjligt att införa före-slagna förbättringar utan ganska omfattande förändringar i processen.
Luvata Sweden AB, Finspång, manufactures thin copper strips for the auto- and elec-tronics industry. Copper has the ability to react chemically with the surrounding at-mosphere. This will cause the copper to become discolored. To avoid discoloring during transport to customers, a protecting agent is used. In some occasions this protector has failed with dissatisfied costumers and complaints as a result.
The aim for this thesis work is to investigate the possibilities to reduce the discolor-ing problem. This has been done by investigating the possibility to introduce a newly developed control equipment and by possible improvements to the production proc-ess.
The possibility to use the control equipment for acceptance control was investigated. Parameters such as presence of systematic and random errors were considered. The equipment turned out to be hard to use and occasionally returned faulty readings. The main concern is however that no production sample is good enough to pass the test. It is therefore concluded that this control equipment is not suitable for accep-tance control.
Possible improvements to controllable parameters in the production process were investigated. A Design of Experiments (DoE) was used to evaluate these tasks. The DoE indicated possible improvements to some parameters. To introduce the pro-posed improvements, some major alterations of the production process have to be done.
47
Silva, Sílvia Gisela Almeida. "Desenho de experiências aplicado à produção de nanopartículas de PLGA para libertação controlada de Doxorubicina." Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/10090.
Full textAbstract:
Dissertação para a obtenção do Grau de Mestre em Engenharia Química e BioquímicaO objectivo do presente trabalho é produzir nanopartículas de PLGA com Doxorubicina pelo método de extracção/evaporação por solvente e estudar o efeito dos parâmetros de síntese sobre as características das nanopartículas utilizando o desenho de experiências do composto central e o programa Statistica para a análise de resultados. Foram escolhidas como variáveis dependentes o tamanho da partícula, o potencial zeta (Z), o carregamento de fármaco e o rendimento de produção e como variáveis independentes a concentração de emulsificante (PVA), o volume de emulsificante e o tempo de sonicação. As nanopartículas produzidas nas condições experimentais dadas pelo desenho de experiências, caracterizadas relativamente ao tamanho por DLS, morfologia por SEM, carregamento de fármaco e rendimento, apresentam uma forma esférica e uma superfície lisa. Foram construídas as curvas de superfície para cada variável dependente utilizando o programa Statistica tendo os resultados mostrado que as variáveis independentes com maior efeito nas variáveis dependentes são o volume e a concentração de PVA. Com o objectivo de produzir partículas com valores elevados de Z e de carregamento de fármaco com tamanhos entre 120-140nm (A) ou 100-120nm (B), foram seleccionados com base nos gráficos de superfície os valores das variáveis independentes 15 ml; 3%(P/V);60s e 4ml;3%(P/V);60s, respectivamente. Nestas condições, as nanopartículas A produzidas apresentaram um tamanho de 125 nm, um Z=-11.3mV, um carregamento de fármaco entre 10.23%-12.58% (mg/mg) e um rendimento entre 53.8%-59.0%, sendo o Z e o rendimento ligeiramente superiores aos valores esperados. As nanopartículas B apresentaram um tamanho de 100 nm, um Z=-9.5mV, um carregamento de fármaco entre 19.44%-21.52% (mg/mg) e um rendimento próximo de 26.2%, sendo o rendimento ligeiramente inferior ao valor esperado. Os perfis de libertação de Doxorubicina apresentam uma cinética de 1ª ordem, característica de um processo de difusão, seguida de uma cinética de ordem zero, característica de um processo de degradação.
48
Ferreira, Svedberg Marilene. "Tillämpning av försöksplanering för att öka kunskap om laserskärningsprocess : En fallstudie enligt DMAIC vid Gestamp HardTech AB i Luleå." Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70111.
Full textAbstract:
Genom att använda statistiska verktyg kan en ökad förståelse av industriella processer och produkter skapas. En kraftfull metod som kan användas inom processoptimering är Försöksplanering. Trots att industrin behöver denna teknik, används försöksplanering inte tillräckligt. En tidigare studie i Sverige visar att brist på kunskap och kompetens är två av orsakerna till denna låga användningsfrekvens av Försöksplanering inom industrin. DMAIC är en metod som används i Sex Sigma projekt för att omvandla ett komplext problem till ett mer hanterbart. Examensarbetets syfte är att illustrera hur Försöksplanering tillsammans med DMAIC kan användas inom en tillverkande industri för att nå ökad förståelse kring en laserskärningsprocess i tjock metallplåt. Examensarbetet har genomförts som en fallstudie på företaget Gestamp HardTech. Företaget tillverkar produkter till bilindustrin och använder sig av fiberlaser för att bearbeta metallplåtar i sina tillverkningsprocesser. Laserskärning av tjocka produkter i höghållfast stål har stora variationer, vilket resulterar i en process med bristande kvalitet. Orsakerna till variationerna i laserskärning är i stort sätt kopplad till en mängd varierande faktorer som ingår i skärprocessen. Vilka faktorer som påverkar variationen mest är okända. Därför har försöksplanering använts för att kunna identifiera de faktorer som har störst påverkan på processens kvalitet. För att underlätta tillämpningen av verktyget Försöksplanering har problemlösningsmetodiken DMAIC använts. Under Define-fasen identifierades en mängd kvalitetsproblem för laserskärning av tjocka metallplåtar varav fyra kvalitetsproblem studerades. Dessa problem var: Sprutmängd på tipp, Slagghjöd, Grovhet på skärytan och Frammatningsstopp. Under Measure-fasen valdes fyra försöksfaktorer: Hastighet, Effekt, Gastryck och Dysavstånd. Ett tvånivåers-faktorförsök med design 24-1 och två replikat och fyra centrumpunkter genomfördes. Under Analyse-fasen har försöksresultatet analyserats och det visade att faktorerna Hastighet, Gastryck och Dysavstånd påverkar Sprutmängd på tipp, Slagghöjd och Grovhet vid position 3. Frammatningsstopp påverkas av Dysavstånd och Grovhet vid position 2 påverkas av Hastighet och Effekt. I enlighet med de sista två faserna av DMAIC har även ett verifieringsexperiment genomförts och potentiella lösningar till problemen ovan har framtagits.
49
Boboková, Alexandra. "Zisk a komplexní charakterizace extraktů rýmovníku (Plectranthus spp.)." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-413561.
Full textAbstract:
Plectranthus amboinicus is a herb that was found to have a lot of bioactive compounds, most of them are polyfenolic compounds. Extraction is neccesary to obtain bioactive compounds and to use them subsequently in food or cosmetic industry. Three methods of extraxtion – maceraction, PHWE and PFE, were used in this study. The best yield of extracted polyfenols was observed by maceration. Maceration was, in the next step, optimized using mathematical statistical method of planned experiment (DOE). The optimal conditions found for extraction were: temperature 60 °C, solvent 40% ethanol, time 90 minutes, solid-solvent ratio 1:10. Total phenolic compunds content in this extract was 0,18 ± 0,05 mgGAE·ml-1, which means 1,83 ± 0,53 mgGAE·g-1 of plant. The antioxidant activity was 148,69 ± 26,92 gTEACml-1. Percentage of radical scavenging activity ABTS•+ was 30,03 ± 5,44 %. Further, 27 of volatile aroma compounds were identified in optimal extract, the most important were: -selinene (16,67 %), trans--bergamotene (14,22 %), caryophyllene (14,11 %), 3-carene (8,22 %), -copaene (7,55 %), -terpinene (6,28 %), humulene (5,87 %), cadina-1(10)-4-diene (5,19 %).
50
Clay, Stephen Brett. "Characterization of Crazing Properties of Polycarbonate." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/28648.
Full textAbstract:
The purpose of this study was to characterize the craze growth behavior of polycarbonate (PC) as a function of stress level, model the residual mechanical properties of PC at various craze levels and strain rates, and determine if the total surface area of crazing is the sole factor in residual properties or if the crazing stress plays a role. To obtain these goals, a new in-situ reflective imaging technique was developed to quantify the craze severity in transparent polymers.
To accomplish the goal of craze growth rate characterization, polycarbonate samples were placed under a creep load in a constant temperature, constant humidity environment. Using the new technique, the relative craze density was measured as a function of time under load at stresses of 40, 45, and 50 MPa. The craze growth rates were found to increase exponentially with stress level, and the times to 1% relative craze density were found to decrease exponentially with stress level. One exception to this behavior was found at a crazing stress of 50 MPa at which over half of the samples tested experienced delayed necking, indicating competitive mechanisms of crazing and shear yielding. The draw stress was found to be a lower bound below which delayed necking will not occur in a reasonable time frame.
The yield stress, elastic modulus, failure stress, and ductility were correlated to crazing stress, relative craze density, and strain rate using a Design of Experiments (DOE) approach. The yield stress was found to correlate only to the strain rate, appearing to be unaffected by the presence of crazes. No correlation was found between the elastic modulus and the experimental factors. The failure stress was found to decrease with an increase in relative craze density from 0 to 1%, increase with an increase in crazing stress from 40 to 45 MPa, and correlate to the interaction between the crazing stress and the strain rate. The ductility of polycarbonate was found to decrease significantly with an increase in relative craze density, a decrease in crazing stress, and an increase in strain rate.
The craze microstructure was correlated to the magnitude of stress during craze formation. The area of a typical craze formed at 40 MPa was measured to be more than 2.5 times larger than the area of a typical craze formed at 45 MPa. The fewer, but larger, crazes formed at the lower stress level were found to decrease the failure strength and ductility of polycarbonate more severely than the large number of smaller crazes formed at the higher stress level.Ph. D.