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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
51

Predicting and reducing warranty costs by considering customer expectation and product performance

Sharma, Naresh Kumar, January 2008 (has links) (PDF)
Thesis (Ph. D.)--Missouri University of Science and Technology, 2008. / Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed March 2, 2009) Includes bibliographical references (p. 216-220).
52

Essays on vertical mergers, advertising, and competitive entry

Ayar, Musa, January 1900 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2008. / Vita. Includes bibliographical references.
53

Design and analysis of high-Q amorphous microring resonator sensors for gaseous and biological species detection /

Manoharan, Krishna. January 2009 (has links)
Thesis (M.S.)--Ohio University, March, 2009. / Title from PDF t.p. Includes bibliographical references.
54

Three essays on economics and risk perception

Hwang, Yun Jae, January 2006 (has links)
Thesis (Ph. D.)--Ohio State University, 2006. / Title from first page of PDF file. Includes bibliographical references (p. 115-119).
55

Experiments to modify grape juice potassium content and wine quality on granite derived soils near Paardeberg /

Agenbach, G. January 2006 (has links)
Thesis (MScAgric)--University of Stellenbosch, 2006. / Bibliography. Also available via the Internet.
56

The effect of region, yeast strain and ascorbic acid on the development of a sulphur-like aroma and on Sauvignon blanc wine quality

Swart, Ewarda 12 1900 (has links)
Thesis (MSc Food Sc )--University of Stellenbosch, 2000. / ENGLISH ABSTRACT: Highly valued Sauvignon blanc wines, with the distinctive cultivar-typical aromas, reminiscent of grassy, green pepper or asparagus-like, are produced in some South African regions. Quite often, however, neutral and sulphur-like, low quality Sauvignon blanc wines are produced and this phenomenon is of great concern to wine producers and consumers, and affects our competition on overseas markets, negatively. The aim of this study was to investigate the effect of region, ascorbic acid/S02 treatments and yeast strain on Sauvignon blanc wine aroma and quality. Wines were produced from grapes obtained from the warmer Robertson and the relatively cooler Stellenbosch regions (1998 season). The juices were treated with different combinations of ascorbic acid/S02 treatments [commercially available ascorbic acid/meta preparate, S02 (control), pure ascorbic acid/S02] and Saccharomyces cerevisiae yeast strains (Vin 13, VL3C, NT 116). The wines were analysed for esters, higher alcohols, monoterpenes and 2-methoxy-3-isobutylpyrazine (ibMP). The wines were also sensorially evaluated for wine aroma intensities (fruity/ester, sulphur-like, grassy/green pepper) and overall quality. Additionally, the synergistic action of ibMP and the sulphur-containing component, 4-mercapto-4-methylpentan-2- one (MMP), considered to be the most important impact components of Sauvignon blanc, was studied. The two components were added, separately and in combinations at increasing concentrations, to different media. The nuances perceived, varied from dusty, grassy to green pepper for ibMP and from guava, sulphur-like to cat urine or "conifer" for MMP. Significant differences were observed between the wines treated with the different combinations of ascorbic acid/S02 treatments and fermented with different yeast strains, irrespective of region. The highest quality, cultivar-typical Sauvignon blanc wines were produced from the pure ascorbic acid/S02 treatment in combination with yeast strains Vin 13 and NT 116. This coincided with high ester and low higher alcohol concentrations, which did not overpower the typical Sauvignon blanc character. The treatments had, in some cases, a significant effect on monoterpene levels, but it was concluded that these differences were not big enough to affect wine quality. Levels of ibMP were too low and could not be reliably measured. Low quality wines, with prominent, undesirable sulphur-like aromas, were produced from juices, treated with the commercially available ascorbic acid/meta preparate and the French yeast strain, VL3C. Techniques, followed to identify the aroma components causing the sulphur-like offflavours, as MMP or as other sulphur-containing components, were gas chromatography/mass spectrometry, solid phase microextraction and sniffing. However, these tests were not successful and studies to identify these off-flavours should be continued. It was succeeded in this study to produce Sauvignon blanc wines without the undesirable, sulphur-like aromas. Although this investigation showed that a newly developed, commercially available ascorbic acid/meta preparate did not yield any sulphur-like off-flavours, quite often Sauvignon blanc wines with such off-flavours are still produced. Further research is needed to clarify this phenomenon. / AFRIKAANSE OPSOMMING: Hoë kwaliteit Sauvignon blanc wyne, met kenmerkende kultivar-tipiese, gras-, groenrissie- of aspersie-agtige aromas, word in sekere streke van Suid Afrika geproduseer. Die gereelde produksie van neutrale, en swawelagtige lae kwaliteit Sauvignon blanc wyne, wek egter nie net groot kommer by wynprodusente en verbruikers nie, maar het ook 'n negatiewe impak op kompetisie met oorsese markte. Die doel van hierdie studie was dus om die effek van streek, askorbiensuur/Sóbehandelings en gisras op Sauvignon blanc wynaroma en kwaliteit vas te stel. Wyne is berei met druiwe wat verkry is van die warmer Roberston en relatief koeler Stellenbosch streke (1998 seisoen). Verskillende kombinasies askorbiensuur/So, behandelings [kommersieel-beskikbare askorbiensuur/meta preparaat, S02 (kontrole), suiwer askorbiensuur/So-l en Saccharomyces cerevisiae gisrasse (Vin 13, VL3C, NT 116) is gebruik tydens die wynbereidingsproses. Spesifieke ester-, hoër alkohol-, monoterpeen- en 2-metoksi-3-isobutiel metoksipirasienkonsentrasies (ibMP) is in die wyne bepaal. Die wyne is ook sensories vir wynaroma intensiteite (vrugtig/ester, swaweiagtig, gras/groenrissie-agtig) en algehele kwaliteit geëvalueer. Die sinergistiese aksie van ibMP en die swawelbevattende komponent, 4-merkapto- 4-metielpenta-2-oon (MMP), wat beskou word as die belangrikste impakkomponente in Sauvignon blanc, is addisioneel bestudeer. Hierdie komponente is in toenemende konsentrasies, individueel en in kombinasies, tot verskillende media gevoeg. Die nuanses wat waargeneem is, het van stowwerig, gras-, groenrissie-agtig vir ibMP, tot koejawelagtig, swaweiagtig, katurine, konifeer vir MMP, gevarieer. Ongeag streke, is betekenisvolle verskille tussen die wyne wat berei is met die verskillende kombinasies van askorbiensuur/So- behandelings en gisrasse, waargeneem. Hoër kwaliteit, kultivar-tipiese Sauvignon blanc wyne is berei met suiwer askorbiensuur/So- in kombinasie met gisras Vin 13 of NT 116. Alhoewel die hoë ester- en lae hoër alkohol- konsentrasies, hierdie resultate bevestig het, is die tipiese Sauvignon blanc karakter nie hierdeur oorheers nie. Sommige behandelings het wel 'n betekenisvolle invloed of monoterpeenkonsentrasies gehad het, maar was te min om 'n effek op wynkwaliteit uit te oefen nie. Die konsentrasievlakke van ibMP swawelagtige aromas, het egter voorgekom in wyne wat met die kommersieelbeskikbare askorbiensuur/meta preparaat en die Franse gisras, VL3C, berei is. Verskeie tegnieke soos gaschromatografie/massa spektrometrie, soliede fase mikroekstraksie en "sniffing", is gebruik om die komponent, MMP, wat moontlik verantwoordelik vir hierdie ongewensde swawelagtige wangeure was, te identifiseer. Die identifikasie hiervan was egter onsuksesvol, en verdere studies is nodig om die komponent(e) verantwoordelik vir hierdie wangeure, te identifiseer. Die suksesvolle produksie van Sauvignon blanc, sonder ongewensde swaweiagtig aromas, was wel moontlik. Alhoewel hierdie studie ook duidelik getoon het dat daar geen swawelagtige wangeure in die wyne wat met die nuut ontwikkelde, kommersieel-beskikbare askorbiensuur/meta preparaat berei was, voorgekom het nie, vind die produksie van Sauvignon blanc wyne met van hierdie wangeure nog steeds plaas. Verdere navorsing rakende hierdie aspek is nodig.
57

Autenticidade molecular de produtos cárneos

Felkl, Gabriela Sartori 19 February 2014 (has links)
CAPES / A autenticidade adequada de um produto cárneo conforme seu padrão de identidade (rotulagem) é imprescindível, por questões econômicas, de saúde éticas e religiosas, além de ser uma exigência dos órgãos vigentes de alimentos. Contudo, a identificação dos constituintes cárneos em um produto ainda é um desafio considerável para as autoridades, visto que nem sempre é possível detectá-los através dos métodos convencionais, principalmente após o processamento do produto. Este fator limitante torna a fraude por substituição de uma espécie animal por outra de menor valor econômico um ato muito comum. O presente trabalho tem como objetivo determinar a presença de carne suína e de frango em produtos processados a partir do diagnóstico molecular por Reação em Cadeia da Polimerase (PCR). Para tanto, realizou-se o diagnóstico molecular da espécie suína e de frango, primeiramente extraindo-se o DNA alvo, seguido da amplificação do mesmo. Em seguida, os oligonucleotídeos iniciadores das espécies suína e aviária foram avaliados quanto a sua especificidade e sensibilidade, mostrando-se eficazes, com limite de detecção a partir de 0,1%. Ao analisar 27 amostras de produtos cárneos comerciais, a metodologia PCR se mostrou satisfatória e robusta, uma vez que detectou adulteração em três amostras, além de não demostrar variação nos resultados em função do tratamento térmico utilizado no produto. / Proper authenticity of a meat product as your identity standard (labeling) is essential by economic issues, health and religious as well as being a requirement in existing organs of food. However, the identification of constituents in a meat product is still a considerable challenge for the authorities, as it is not always possible to detect them by conventional methods, especially after processing the product. This limiting factor makes the fraud by replacement of one animal species by another of lower economic value a very common act. This study aims to determine the presence of pork and chicken in processed products from the molecular diagnostic by Polymerase Chain Reaction (PCR). For this, we carried out the molecular diagnosis of swine and chicken species, first extracting the target DNA, followed by amplification of the same. Thus, the primers of chicken and pork species were evaluated for specificity and sensitivity, showing effective, with a detection limit from 0.1%. By analyzing 27 samples of commercial meat products, the PCR method has proved satisfactory and robust, once adulteration as been detected in three samples. Besides not demonstrate variation us results regarding to heat treatment used in the product.
58

Managing the quality of colour television receivers in the Republic of South Africa

Higgins, John Morwood 06 1900 (has links)
This study investigates whether quality management has developed to such an extent that retailers, service repair organisations and consumers are satisfied with product and repair service quality provided by South African manufacturing companies. To investigate these aspects, the colour television industry has been selected because it contains various manufacturing companies of varying sizes and characters, employing different quality policies and performances. It offers relatively standardised products and services, which facilitates intercompany comparisons and employs a simple flow type assembly line process that is representative of other mass production industries. The hypotheses are tested by interviewing four selected populations by means of carefully constructed questionnaires, namely a retail population, a repair service population, a consumer population and a manufacturing population. The empirical results are statistically evaluated in terms of the various manufacturers ability to provide satisfactory product and repair service quality. Consumers and repair service organisations are selected because they represent a broad spectrum of the population with varying, but important opinions on product and repair service quality. Retailers selling colour television receivers are also selected as they play an important role in the management of quality and vary from small independent retailers to large chain stores and discounters. The results obtained from this study show that: • there is a need from the retailers, service repair organisations and consumers for the South African manufacturers to improve the quality of colour television receivers • there is a need by the consumers and the retailers for the manufacturers to improve their repair service quality • there is a need to improve the quality control procedures employed by the colour television manufacturers. / Business Management / D. Com. (Business Management)
59

Youth perception of service quality of large food retailers in the Cape Metropolis

Adam, Shaneen January 2017 (has links)
Thesis (MTech (Business Administration))--Cape Peninsula University of Technology, 2017. / Retailers (including food retailers) are facing challenging times due to the dynamic business environment. Increasing competition, uncertain economic environment. The sophistication of consumers has prompted retailers to improve not only their product offering but service quality too. Some food retailers, however, have gained a reputation for poor service quality. On the other hand, those food retailers providing high levels of service quality, warrant customer satisfaction and customer loyalty, and minimise customer defection, ultimately affecting positive profitability. The youth is a significant market to target for any retailer. Retailers that can attract and muster support from the youth can build long term relationships that result in strong customer loyalty. For this study, second and third year retail students enrolled at a university of technology were deemed as the target population following the rationale that these students would be familiar with retail concepts and be conscious of service quality issues. The study aimed to measure youth perceptions of service quality of large food retailers in line with the dimensions of the Retail Service Quality Scale (RSQS). An online survey was employed via the university’s intranet to where the youth customers were requested to rate their service quality perceptions of a large food retailer they frequented the most and to highlight areas of service quality that required attention. The results were generally neutral, large food retailers were generally perceived as fairly providing quality service in some areas, though in other areas not so successful. The findings reveal that youth significantly felt personal interaction and physical aspects of the retailer was the most important service quality determinant. In particular, convenient shopping was paramount; and thereafter quality goods and services offered by the retailer. The study further showed that youth favoured service quality offered by retailers over the price of goods and services. Therefore, youth would remain loyal to their food retailers that provide satisfactory levels of service quality even if their prices were higher than their competitors’ prices. Retailers that want to attract youth would need to improve the reliability dimension, which includes stock availability, and the service process relating to paying. The literature and the data collected provided the researcher with the opportunity to explore youth perceptions of service quality of food retailers in the Cape Metropolis.
60

Avaliação de novas tecnologias para otimização de desenvolvimento do produto / Valuation of new technologies to optimization of the development of product

Pinardi, Emerson Roberto 05 February 2005 (has links)
Orientador: Sergio Tonini Button / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-08-05T06:48:27Z (GMT). No. of bitstreams: 1 Pinardi_EmersonRoberto_M.pdf: 2980822 bytes, checksum: d3b98a4a8570258311e79f8b2c9806f5 (MD5) Previous issue date: 2005 / Resumo: O objetivo desse trabalho é otimizar as fases de desenvolvimento de produto buscando reduzir principalmente o tempo e os custos envolvidos nas mesmas. Como o desenvolvimento é uma atividade muito ampla, que pode ser dividido basicamente em cinco fases: planejamento, desenvolvimento do projeto, desenvolvimento do processo, manufatura, melhoria contínua. Esse trabalho concentrou-se na fase de projeto, mais especificamente no processo de distribuição de desenho de produto gerado na Engenharia, o qual é utilizado em diversos setores das unidades fabris. O desafio foi gerar um sistema informatizado para distribuição do desenho de produto, o qual pode ser gerado a partir de 4 sistemas de CAD diferentes dependendo da disponibilidade de sistema e qual a interface necessária para atender o cliente. Após a criação do novo sistema de distribuição de desenho, comparou-se com a metodologia convencional aplicada até então, baseada em cópia de papel e distribuição via correio interno, indicando os ganhos e os possíveis inconvenientes surgidos. Os resultados obtidos mostram como essa nova metodologia de distribuição de desenho informatizado diminuiu os gastos com a geração de cópias, o tempo de trânsito da informação, bem como a facilidade de acesso à mesma / Abstract: The objective of this work is optimize the phases of product development, reduce the main time and the cost involved in itself. Like the development is a wide activity, that can be divided in five basic phases: planning, development of project, development of process, manufacturing, continued increase. Emphasized only in project phase, to increase the specific process of distribution of product drawing made by Engineering, and itself is utilized in many departments of the several units the same company. The challenge was create a computer system to distribution of drawing product, itself can be made in four different CAD systems as according as availability the system and which interface were necessary to attend the customer. After made the new system of drawing distribution, compared with a conventional methodology applied nowadays, which was based in paper copy and distribution by internal mail, showing the profit and the possible inconvenience that could happen. The results show like this new methodology to distribution of electronic drawing lows the cost with the copy drawing, time of the information circulate, and the facility to access electronic drawings / Mestrado / Materiais e Processos de Fabricação / Mestre em Engenharia Mecânica

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