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Погоржельська, Юлія Олександрівна, Юлия Александровна Погоржельская, Yuliia Oleksandrivna Pohorzhelska, and І. В. Кібукевич. "Розроблення інформаційної системи управління інструментальною підготовкою виробництва машинобудівного підприємства." Thesis, Сумський державний університет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/31286.
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Ефективність машинобудівного виробництва в значній мірі залежить від інструментальної підготовки виробництва (ІПВ). Тільки в тому випадку, коли основне виробництво своєчасно одержує необхідний якісний інструмент, воно може функціонувати чітко, без перебоїв. Одним із шляхів в підвищенні ефективності діяльності вітчизняних багатономенклатурних підприємств є досягнення оптимальної організації й управління процесом інструментальної підготовки виробництва на основі впровадження сучасних інформаційних технологій.
При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/31286
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Do, Lan. "New tools for sample preparation and instrumental analysis of dioxins in environmental samples." Doctoral thesis, Umeå universitet, Kemiska institutionen, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-70218.
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Polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs), two groups of structurally related chlorinated aromatic hydrocarbons, are of high concern due to their global distribution and extreme toxicity. Since they occur at very low levels, their analysis is complex, challenging and hence there is a need for efficient, reliable and rapid alternative analytical methods. Developing such methods was the aim of the project this thesis is based upon. During the first years of the project the focus was on the first parts of the analytical chain (extraction and clean-up). A selective pressurized liquid extraction (SPLE) procedure was developed, involving in-cell clean-up to remove bulk co-extracted matrix components from sample extracts. It was further streamlined by employing a modular pressurized liquid extraction (M-PLE) system, which simultaneously extracts, cleans up and isolates planar PCDD/Fs in a single step. Both methods were validated using a wide range of soil, sediment and sludge reference materials. Using dichloromethane/n-heptane (DCM/Hp; 1/1, v/v) as a solvent, results statistically equivalent to or higher than the reference values were obtained, while an alternative, less harmful non-chlorinated solvent mixture - diethyl ether/n-heptane (DEE/Hp; 1/2, v/v) – yielded data equivalent to those values. Later, the focus of the work shifted to the final instrumental analysis. Six gas chromatography (GC) phases were evaluated with respect to their chromatographic separation of not just the 17 most toxic congeners (2,3,7,8-substituted PCDD/Fs), but all 136 tetra- to octaCDD/Fs. Three novel ionic liquid columns performed much better than previously tested commercially available columns. Supelco SLB-IL61 offered the best overall performance, successfully resolving 106 out of the 136 compounds, and 16 out of the 17 2,3,7,8-substituted PCDD/Fs. Another ionic liquid (SLB-IL111) column provided complementary separation. Together, the two columns separated 128 congeners. The work also included characterization of 22 GC columns’ selectivity and solute-stationary phase interactions. The selectivities were mapped using Principal Component Analysis (PCA) of all 136 PCDD/F’s retention times on the columns, while the interactions were probed by analyzing both the retention times and the substances’ physicochemical properties.
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Kuebel, Christa. "PREPARATION, CONTINUING EDUCATION, AND PROFESSIONAL DEVELOPMENT OF INSTRUMENTAL MUSIC MAJORS TEACHING ELEMENTARY GENERAL MUSIC." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1491408733327604.
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Vondracek, Paul Theodoor Johannes Wilhelmus. "Implementing time based manufacturing practices in pharmaceutical preparation manufacturers : improving time-based manufacturing practices and enhancing manufacturing performance through action research." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4465.
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A double case study applying action research methodology was conducted in two pharmaceutical preparation manufacturers in the Netherlands to improve their manufacturing systems by implementing time-based manufacturing (TBM) practices. Following the diagnosis phase, the situation of each Company was analysed and suitable improvement interventions were selected for implementation in the Case Companies. At the end of the action research project, semi-structured interviews were taken in each Company a year later, and the achieved results of the improvement programmes were collected and analysed. This research extends the existing theory of time-based competition and demonstrates that TBM practices apply also in the pharmaceutical preparation manufacturing industry. Furthermore, this study shows how to improve TBM practices and reduce the throughput time by providing the route for improvement and implementation. Although the first Case Company did not improve the core TBM practices and manufacturing performance, its infrastructure improved through the implementation of an ERP system and further enhancement of its quality management system, illustrating that the design of the infrastructure is a key factor to become a time-based competitor. The second Case Company succeeded to improve the 2 TBM practices and throughput processes resulting in the reduction of the order cycle time and increase of the delivery dependability. Based on the data of the two Case Companies, this study demonstrated the relationship between these two manufacturing performance parameters, which indicates that manufacturers may strive for both delivery speed and delivery reliability using the same improvement plan. Adopting TBM is a long journey of many years and needs a continuous improvement infrastructure.
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Vondracek, Paul T. J. W. "Implementing time based manufacturing practices in pharmaceutical preparation manufacturers. Improving time-based manufacturing practices and enhancing manufacturing performance through action research." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4465.
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A double case study applying action research methodology was conducted in two
pharmaceutical preparation manufacturers in the Netherlands to improve their
manufacturing systems by implementing time-based manufacturing (TBM) practices.
Following the diagnosis phase, the situation of each Company was analysed and
suitable improvement interventions were selected for implementation in the Case
Companies. At the end of the action research project, semi-structured interviews were
taken in each Company a year later, and the achieved results of the improvement
programmes were collected and analysed. This research extends the existing theory of
time-based competition and demonstrates that TBM practices apply also in the
pharmaceutical preparation manufacturing industry. Furthermore, this study shows how
to improve TBM practices and reduce the throughput time by providing the route for
improvement and implementation. Although the first Case Company did not improve
the core TBM practices and manufacturing performance, its infrastructure improved
through the implementation of an ERP system and further enhancement of its quality
management system, illustrating that the design of the infrastructure is a key factor to
become a time-based competitor. The second Case Company succeeded to improve the
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TBM practices and throughput processes resulting in the reduction of the order cycle
time and increase of the delivery dependability. Based on the data of the two Case
Companies, this study demonstrated the relationship between these two manufacturing
performance parameters, which indicates that manufacturers may strive for both
delivery speed and delivery reliability using the same improvement plan. Adopting
TBM is a long journey of many years and needs a continuous improvement
infrastructure.
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Hasson, Dhari A. "Mixture preparation and combustion in spark ignition engines." Thesis, Aston University, 1986. http://publications.aston.ac.uk/11867/.
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Goddard, Timothy Glenn. "Modeling and analysis of weaving preparation systems with respect to small lot manufacturing." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/9487.
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Silva, Reyes Alfredo Jeampiere, and Castro Rosa Fernanda Salas. "Application of Lean Techniques to Reduce Preparation Times: Case Study of a Peruvian Plastic Company." Research India Publications, 2017. http://hdl.handle.net/10757/622530.
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This article examines the problem of an increase in product returns for a company that produces plastic films for flexible packaging. Among the factors that have resulted in the increase of returned products are defects in the films caused by the poor manipulation of materials and, above all, the hard point in the coils caused by excessive extruder preparation time, causing the extrusion head to overheat as well as uneven extrusion. Extrusion is a key process in the production of plastic materials as it transforms polypropylene and additives into plastic sheets. The delay in the preparation time caused by machine operators leads to the overheating of the extrusion head and, therefore, defective products that are ultimately returned to the company by customers. In order to confront this problem, a proposal was developed using the SMED tool of Lean Manufacturing in order to reduce the preparation time of the extruder and to increase the productivity of the company. For the validation of the proposal, we simulated the system to determine the resulting reduction in extruder preparation time.
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Williamson, Brad A. "A study of Ohio high school band directors' perceived preparation for teaching high school marching band through participation in a collegiate marching band, marching band technique classes, and methods courses." Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1243463233.
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Taivalkoski, Olivia. "Laser ablation of aluminium before welding : Effect of weld preparation on number and sizes of pores." Thesis, KTH, Materialvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297679.
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Welding aluminium often results in porosity in the weld. One way to reduce porosity is by carful weld preparation and cleaning. In this master thesis report laser ablation was done on aluminium plates before welding to remove dirt and the surface oxide layer. Different hold times from finish of laser ablation to start of welding was also used and evaluated. Cleaning with only ethanol or brushing and cleaning with ethanol was also used for comparison. In addition, two filler wires of the same material were used for the welding, one new unopened and one old that had been opened and kept in open packaging for two years. For one weld on laser ablated plates the old filler wire was also laser ablated before use. The results showed that new filler wire gave the least number of pores, and the results were nearly the same with laser ablated plates welded directly as with ethanol cleaned plates. Welds with old filler wire had a bigger range in the results and the cleaning methods of the plates had a bigger impact. The results from the welds with old filler wire showed less porosity in the welds on laser ablated plates with hold times of six minutes, one hour and one day compared to ethanol cleaned plates and brushed plates. In common for both filler wires were that the weld of the laser ablated plates with a hold time of a week had the most pores. The conclusions are that it is good to use the filler wire as close in time to the opening of the packaging as possible and not store it a long time to then use it later. Laser ablation is a valid option for cleaning, but the machine is expensive and therefore most suitable for weld preparation of welds in high demand applications or on plates with very much dirt or thick oxides.Svetsning av aluminium resulterar ofta i porer i svetsgodset. Ett sätt att reducera porositeten är genom noggrann rengöring innan svetsning. I detta master exsamensarbete användes laserablation, eller laserblästring, av aluminiumplåt innan svetsning för att rengöra och ta bort ytoxiden. Olika väntetider från slutförande av laserablation till påbörjande av svetsning användes och utvärderades också. Förutom laserablation användes rengöring med endast etanol eller borstning och sedan rengöring med etanol som referens att jämföra med. Dessutom användes två tillsatstrådar i samma material med skillnaden att den ena var ny och oöppnad innan användning och den andra hade förvarats i en öppnad förpackning de senaste två åren. Till en av svetsarna på de laserablerade plåtarna användes en gammal tillsatstråd som hade laserablerats. Resultatet visade att den nya tillsatstråden gav minst antal porer i den färdiga svetsen, oberoende av vilken rengöringsmetod som hade använts. Svetsar gjorda med den gamla tillsatstråden hade större spridning i resultaten jämfört med den nya tråden och här spelade också rengöringsmetoden större roll. Resultaten från svetsar gjorda med den gamla tillsatstråden hade färre porer i svetsarna på de laserablerade plåtarna med väntetiderna sex minuter, en timme och ett dygn jämfört med de som var rengjorda med etanol och de som var borstade. Gemensamt för bägge trådarnas svetsar var att de svetsar som var gjorda på laserablerade plåtar med väntetid på en vecka hade flest antal porer. Slutsatserna är att det är bra att använda tillsatstråden så nära som möjligt från när den öppnades, och inte att förvara den under lång tid för att senare användas igen. Laserablation är ett bra alternativ till rengöring, men laserableringsmaskiner är dyra. Därför passar laserablering bäst för rengöring innan svetsning när det ställs höga krav på svetsen och slutprodukten. Laserablering kan också vara användbart om det är väldigt smutsiga plåtar eller om ytoxiden är tjock.
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Wenger, Alan J. "The Solo Compositions for Trumpet of Fisher Aubrey Tull: An Analysis of Structural, Technical, and Stylistic Elements for Performance Preparation, with Three Recitals of Selected Works by Bozza, Fasch, Haydn, Tomasi, and Others." Thesis, view full-text document. Access restricted to the University of North Texas campus, 2002. http://www.library.unt.edu/theses/open/20022/wenger%5Falan%5Fj/index.htm.
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Thesis (D.M.A.)--University of North Texas, 2002.Accompanied by 4 recitals, recorded Nov. 25, 1996, Mar. 1, 1999, Nov. 1, 1999 and Apr. 8, 2002. Includes discography (p. 142-143) and bibliographical references (p. 144-150).
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Viehbeck, Stefan [Verfasser], and Frank-Michael [Akademischer Betreuer] Matysik. "Application of novel instrumental analytical approaches for the characterization of surface related phenomena in the context of automotive manufacturing / Stefan Viehbeck ; Betreuer: Frank-Michael Matysik." Regensburg : Universitätsbibliothek Regensburg, 2019. http://d-nb.info/1175625361/34.
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Park, Chungwon. "CONSIDERATIONS FOR CHOOSING AND COMBINING INSTRUMENTS IN BASSO CONTINUO GROUP AND OBBLIGATO INSTRUMENTAL FORCES FOR PERFORMANCE OF SELECTED SACRED CANTATAS OF JOHANN SEBASTIAN BACH." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/194278.
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As the core of virtually all vocal and instrumental composition in the Baroque music, the basso continuo group had an extremely important role in the sacred cantatas by Johann Sebastian Bach (1685-1750). During the Baroque period, the choice of instruments was sometimes indicated by the composer, but frequently the performers had to determine which instruments were most appropriate for the particular environment and context of the music.When performing the sacred cantatas of J.S. Bach, the conductor must identify and make decisions regarding the choices and combinations of instruments for both figured and sustained continuo part. In some cases the conductor may even consider changing continuo instrument(s), movement by movement, in a cantata in which a significant shift occurs in the texture, orchestration, or dramatic function of singer's line. Since Bach's cantatas are an encyclopedia of Baroque musical style, and models of compositional techniques of the time, understanding the cantatas is a practical and effective way to gain understanding regarding his other compositions. These cantatas also present musical challenges and rewards to choirs and orchestras.In an attempt to achieve a greater understanding and establish guidelines, I will examine and propose six principles and parameters regarding choices and combinations of basso continuo instruments and obbligato instruments, examining a variety of movement types from six different sacred cantatas of J.S. Bach ; Christ lag in Todesbanden, BWV 4; Ich hatte viel bekümmernis, BWV 21; Halt im Gedächtnis Jesum Christ, BWV 67; Herr, gehe nicht ins Gericct mit deinem Knecht, BWV 105; Wachet auf, ruft uns die Stimme, BWV 140, and Erschallet, ihr Lieder, BWV 172.This study will include:1) A critical review of performance practice and historical evidence regarding the basso continuo part in Bach's sacred cantatas2) Using "4 TAV System: Six Parameters" performance considerations and suggestions for instrument choices in basso continuo group for chorus, solo, recitative, and chorale movements in the selected cantatas3) Examinations and suggestions of several possible choices and combinations of basso continuo instruments
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Sequeira, Susana Anjos. "Preparation and handling of investigational medicinal products." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/12556.
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Mestrado em Biomedicina FarmacêuticaDuo to all of the challenges related with the production and logistics of the investigational medicinal products, this project aims to make an overview about the development of an investigational medicinal product, and the main details that must be considered in the preparation, packaging, labelling and distribution of investigational medicinal products, in order to provide a quick reference tool in a professional and academic context. A review was made in the international literature to identify studies focusing on development and handling of investigational medicinal products, mainly through PubMed and Medline databases, although it has also resorted to guidelines, some books on the subject, and master and doctoral thesis. Only English language papers were selected. Whenever possible, it were selected the most recent articles. During the development of IMP, solubility, as well as bioavailability assessment and bioequivalence studies, are the most challenging steps in the early phase of preparation of IMPs. Concerning the IMP production, the critical aspects, such as comparators, blinding and package, will determine the success of the entire clinical trial. When the IMP is fully prepared, it enters in the different clinical trials phases, with the aim of providing a range of information, such as efficacy and safety. This whole process must meet a series of requirements previously established, and adequate trained staff, in order to minimize the costs associated with the development of the IMP, as well as accelerate its market entry. It is important to note some limitations in the review. Although there is a wide range of information on the preparation of investigational medicinal products, little information was found on the logistics. In a future work, it would be interesting to further explore the distribution of investigational medicinal products, addressing the main unsatisfactory results of audits, in a clinical trial environment, and find tools and procedures to prevent nonconformities.
Face a todos os desafios relacionados com a produção e logística do medicamento experimental, este projeto tem como objetivo fornecer uma visão geral sobre o desenvolvimento de um medicamento experimental, assim como os principais detalhes que devem ser considerados na preparação, embalagem, rotulagem e distribuição de medicamentos experimentais, de forma a fornecer uma ferramenta de referência rápida em contexto profissional e académico. Foi realizada uma revisão na literatura internacional para identificar estudos com foco no desenvolvimento e distribuição de medicamentos experimentais, principalmente através de bases de dados como o PubMed e Medline, embora também se tenha recorrido a guidelines, e alguns livros e teses de mestrado e doutoramento sobre o objeto de estudo. Foram selecionados apenas artigos na língua inglesa. Sempre que possível, foram selecionados os artigos mais recentes. Durante o processo de desenvolvimento de um medicamento experimental, os estudos de solubilidade, assim como os de biodisponibilidade e bioequivalência, são os maiores desafios nas fases iniciais de desenvolvimento. Atendendo à produção do medicamento experimental, aspectos críticos, como os comparadores, os processos de blinding e embalamento, são determinantes para o sucesso de todo o ensaio clínico. Após a completa preparação do medicamento experimental, este é introduzido nas diferentes fases de ensaio clínico, com o objetivo de fornecer uma ampla informação, como a eficácia e a segurança. Todo este processo deve englobar uma série de requisitos previamente estabelecidos, assim como uma equipa devidamente treinada, de forma a minimizar os custos associados ao desenvolvimento do medicamento experimental, acelerando a sua entrada no mercado. É importante ressalvar que embora exista uma ampla gama de informação sobre a preparação de medicamentos experimentais, foi encontrada pouca informação sobre a logística, sendo fundamental, no futuro, explorar mais a temática da distribuição de medicamentos experimentais, abordando os principais resultados não satisfatórios das auditorias, no âmbito dos ensaios clínicos, e encontrar ferramentas e procedimentos para evitar as nãoconformidades.
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Spencer, David W. "Performing the Trumpet works of Donald Erb; A Guide to Preparation, Interpretation and Practices: A Lecture Recital, Together with Three Recitals of Selected Works by Purcell, Hindemith, Holmes, Friedman, Koetsier and Others." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3207/.
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This study is a guide to the performer on practices associated with the trumpet music of Donald Erb. It examines the following solo and duo compositions for trumpet: the as yet unpublished Sonatina for Trumpet and Piano (1954); Four Duets for Trumpets (1960); Diversion for Two for trumpet & percussion (1966); Concerto for Trumpet and Orchestra (1980); Remembrances for two trumpets (1994); and Dance, You Monster, To My Soft Song for solo trumpet (1998). A history of each composition and information concerning the performers who premiered them are documented. An examination of particular harmonic, melodic and rhythmic elements found frequently in these pieces follow. The pieces are further assessed for difficulty through an investigation of extended technical demands, range, endurance and articulation. Additional discussion focuses on the use of mutes, tempos and dynamics as well as suggestions for the preparation and performance of these works. The dissertation concludes with a review of Donald Erb's legacy as a composer and teacher. A comprehensive discography and complete list of Mr. Erb's compositions are included in appendices.
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Ka, Oumar. "Composes 2-6 serigraphies : preparation et caracterisation de cds et cdte." Paris 6, 1988. http://www.theses.fr/1988PA066319.
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Etude des proprietes fondamentales (structures cristallographiques, proprietes transport, luminescence, etc. ) des couches cdte et cds deposees par serigraphie (depot de la pate contenant le semiconducteur desire, sechage puis frittage haute temperature). Application a la fabrication de photopiles solaires en raison de son faible cout
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Shifa, Abdulaziz B. "Essays on Growth, Political Economy and Development." Doctoral thesis, Stockholms universitet, Nationalekonomiska institutionen, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-89334.
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This thesis has three self-contained articles. Economic growth and trade in human capital: A salient empirical pattern in the East Asian “miracle” is a large increase in output and factor accumulation despite only a modest increase in TFP. I develop and calibrate a model of growth and catch-up to provide a possible explanation. A novel element of the model is a globalized education market allowing human capital transfer from frontier to developing economies – an assumption motivated by the experience of countries like Korea and Taiwan where domestic universities employed graduates of Western universities to provide advanced training. The political economy of urban bias in dictatorial regimes. In many developing countries, public resource allocation is often biased against the rural population – a policy that hurts the vast majority of the poor living in rural areas. This paper develops a dynamic political economy model of urban bias in a dictatorial regime. A novel result of the model is that urban bias can emerge in predominantly agrarian economies even if there is no bias in political power toward urban residents. The empirical evidence from a recently compiled country-level panel dataset on agricultural taxes/subsidies is consistent with the prediction of the model. Does agricultural growth cause manufacturing growth? Empirically assessing the impact of agricultural growth on manufacturing growth is challenging because of endogeneity concerns. This paper attempts to circumvent the identification challenge by using weather variations to instrument for agricultural growth. The IV estimations show that agricultural growth has a significant positive impact on manufacturing growth, and it is larger than the OLS estimates. I discuss the empirical implications for agricultural policies, efficiency of the manufacturing sector, and for the role of agricultural growth in Africa's industrialization.
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Sivasankaran, Visweshwar. "Manufacturing and characterization of single cell intermediate-temperature solid oxide fuel cells for APU in transportation application." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS027/document.
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La fabrication de cellules de piles à combustible IT-SOFC de large dimension par un nouveau procédé simple et peu coûteux est présentée dans ce manuscrit. L’optimisation de ce nouveau procédé en regard de l’utilisation d’agents de porosité, d’épaisseur de couches et de température de frittage a été réalisée. Les résultats des tests électrochimiques sur des cellules de surface active 10 cm2 réalisés dans le dispositif Fiaxell semi-ouvert ont été détaillés pour différentes cellules. Des tests de performance de longue durée ont également été menés sur le dispositif Fiaxell, présentés et discutés. La préparation et la réalisation d’un nouveau banc de test de stack a également été mené et présenté dans ces travauxThe fabrications of large area IT-SOFC planar cell by new simple and cost effective process were explained. The optimization of the new process with respect to pore formers, thickness of layers, sintering temperature were performed. The electrochemical results of 10cm2 performed in Fiaxell open flange set up were detailed with respect to different configuration. Long term ageing performance tests of single cells were conducted in Fiaxell device and results are discussed. Preparation of new test bench and stacking process performed till now were briefed
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Williamson, Brad Alan. "A Study of Ohio High School Band Directors’ Perceived Preparation for Teaching High School Marching Band Through Participation in a Collegiate Marching Band, Marching Band Technique Classes, and Methods Courses." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243463233.
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Deneux, Dominique. "Méthodologie de reconnaissance de caractéristiques d'usinage : Une contribution à l'ingénierie simultanée." Valenciennes, 1993. https://ged.uphf.fr/nuxeo/site/esupversions/af30ac45-95ed-4e24-bc5a-28c0a51135c2.
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Le travail présenté porte sur l'automatisation de l'activité de préparation à la fabrication qui, de par son rôle d'interface entre les phases de conception et de fabrication, apparait comme l'élément essentiel de cette intégration. Nous proposons un modèle de produit homogène incorporant les données topologiques, géométriques et technologiques indispensables à l'application automatique de règles objectives de préparation à la fabrication. Base sur ce modèle, nous décrivons une méthodologie totalement générative de reconnaissance et d'extraction de caractéristiques d'usinage et nous montrons comment celle-ci peut être conjointe à une analyse objective des relations technologiques extrinsèques entre les faces formant la frontière du produit, pour déduire la logique de séquencement des opérations d'usinage associées à ces faces
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Werner, P. O. E. Mathias. "Investigation on HSS milling inserts : cutting edge and surface preparation effect on machinability : the capturing, understanding and structure of the gear manufacturing processes may lead to a dynamic link to design aspects such that more effective and reliable cutting tool system development is acheived /." Stockholm : Industriell teknik och management, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9942.
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Kavan, Petr. "Řešení technologie součásti "víko" v podmínkách středně velké strojírenské firmy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229896.
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The diploma thesis is concerned with evaluation of actual production technology of part “hydraulics cover” and with design of new, progressive variation machining of this part. Solution is focused at first on rationalization of cutting tools and choice of suitable cutting tools. An effort is to achieve shorter production time and decrease costs on production of component. With this problem is related alteration of technological documentation and technical economic evaluation for determination return rate of investments into progressive cutting tools.
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Alquier-Villepelet, Cécile. "Syntheses et proprietes des gels d'oxyde de niobium." Paris 6, 1988. http://www.theses.fr/1988PA066019.
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On etudie le procede sol-gel applique au niobium v sous divers aspects. On ameliore les synthese et proprietes physiques des gels. On etudie les gels et oxydes amorphes obtenus par analyse chimique et thermique, diffraction rx, spectrocopies ir, raman et exafs. On etudie les proprietes et applications potentielles: fabrication de ceramiques linbo::(3) et pb(nb2/3 mg1/3)o::(3), avec abaissement de la temperature de frittage et obtention de grains homogenes monodisperses, mesure de la conductivite ionique dans les xerogels hydrates, proprietes optiques(photochromie)
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HUANG, GUANG-LIN, and 黃光麟. "Preparation of Bonded NdFeB Magnets by Additive Manufacturing Technique." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/353swu.
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碩士國立中正大學
物理系研究所
107
According to the characteristics and the potential merit of the additive manufacturing, the development of hard magnet by 3D printing technology will not noly achieve the 3D design that cannot be achieved by traditional sintering processes, but also extend other industrial applications. In this study, the isotropic and anisotropic NdFeB MQ magnetic powders were adopted to carry out mixing of polymers with different proportions, and the magnetic properties and density of the compounded samples have been investigated. The polymer magnet composite filaments use for FDM (Fused deposition modelling) consist of 90 wt.% MQP-S powders compounded with Nylon12, and 90 wt.% MQA powders compounded with ABS has been successfully produced. Also, high performance polymer magnet composite pellets consist of 95 wt.% MQPB+ powders compounded with Nylon12 has been produced. MQP-S composite filaments have been printed on different shapes magnets with direct 3D printer. The optimized magnetic properties of Br = 3.5 kG, iHc = 8.8 kOe, (BH)max = 2.6 MGOe can be obtained by FDM magnet product. On the other hand, MQP-S composite pellets have been printed magnets by PDM (Pellet deposition modeling). The optimized magnetic properties of Br = 3.9 kG, iHc = 9.3 kOe, (BH)max = 3.4 MGOe were reach by the PDM magnet product. Both the magnet density and the magnetic energy product can increase by PDM in the same formulation of FDM. In addition, this study has been developed high performance MQPB+(95 wt.%) composite pellets, the magnetic properties of Br = 5.3 kG, iHc = 8.8 kOe, (BH)max = 6.1 MGOe, will be printed by using the PDM printer in the future.
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Lee, Chia-Yun, and 李佳芸. "Parameter Prediction for Preparation Section in Fabric Manufacturing by Machine Learning." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/8p4y26.
Full textAbstract:
碩士國立臺灣大學
工程科學及海洋工程學研究所
106
Today, in an Industry 4.0 factory, improving quality of product and efficiency of manufacturing process are important goals in the textile industry. The utilization of advance-prediction tools, so that data can be systematically processed into information and thereby make more informed decisions. To achieve these goals, this study integrates automatic production process and management experience from the perspective of data science and provides a method using 4 different machine learning models to predict the machine operating parameters of the preparation section in fabric manufacturing. The purpose of this study is to intellectualize the textile manufacturing process in order to avoid the tech skills gap and also higher the efficiency of the textile manufacturing process. Based on 10-fold cross-validation, experimental results show that the proposed method provides good performance when comparing with previous stochastic methods, and the best regression model for predicting preparation section parameters can reduce the mean square error (MSE) to 0.056%
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Chen, Yan-Ming, and 陳言銘. "Preparation of PLA from Wastepaper and Manufacturing of PLA Coated Paper." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/49574375526999247344.
Full textAbstract:
碩士國立中興大學
森林學系所
99
The polylactide is biodegradable plastic that can be degraded by water and environmental microorganisms. We can offer it different properties using different synthetic factors. Currently, lactic acid is produced from the fermentation of glucose with lactic acid bacteria, then followed by steps of extraction and purification. If lactic acid could be produced from wood base waste material, the producing cost of polylactide will be effectively reduced and wood base waste material will be more valuable. This study will describe the methodology of isolating glucose from recycled wastepaper, and converting through a series of chemical process to polylactide, then coating polylactide on base paper to produce functional paper, such as waterproof products and disposable utensils. There are three major aspects of investigation, including acid hydrolysis and fermentation of lactic acid, synthesis of polylactide, and manufacturing of polylactide coated paper. In terms of acid hydrolysis, using 72% concentrated sulfuric acid to hydrolyze the recycled waste paper, and the maximum yield of glucose is about 81%. Then fermentation of these sugars to lactic acid with bacteria, Lactobacillus paracasei subsp. pracasei. Each mole of glucose can produce 1.87 mole lactic acid. In terms of polylactide synthesis, using direct polymerization and ring opening polymerization,. The results indicated that the optimal condition of the direct polymerization method is lactic acid added 0.3% stannous octoate at 190 ℃ for 24 hours. The best distribution of average molecular weight of polylactide can be obtained under this condition, and the molecular weight is 12,248. On the other hand, with ring-opening polymerization method, lactic acid was added 0.3% stannous octoate at 150℃ for 12 hours, and more than 44,730 molecular weight of polylactide were obtained. In terms of manufacturing of polylactide coated paper, using two coating methods, one is solution coating method and the other is polylactide particles with PVA as coating binder method. The results indicated that when paper were coated with PVA as coating binder, the tensile strength of coated paper can be improved about 20% with the molecular weight 10,000 of polylactide and the coating amount of 8 g/㎡. It also effectively improve the elongation about 40%, the retention of wet tensile strength is more than 60%. And the water absorption of Cobb test of PLA coated paper was from 30.21 g/㎡ down to 10.03 g/㎡ after coating , it showed that water resistant properties were greatly improved.
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施英輝. "Manufacturing Technique and Property Evaluation of Preparation of Organic/ Inorganic Polylactide Plate." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/t74re8.
Full textAbstract:
碩士逢甲大學
纖維與複合材料學系
102
Since the invention of plastic, because it is light, chemical resistance, etc., so as to quickly enter into people&;#39;s lives. But soon, people will realize the trouble caused by these plastic products. Plastic products, mostly abandoned after incineration or landfill, but those two ways will bring serious consequences. So the studies are beginning to towards the direction of natural degradation. In this study, it’s different ratio of low-melting-point polylactide fibers and recycled high-strength polyester fiber by a different process parameters to prepare RPET / LMPLA nonwoven. Select the best parameters RPET / LMPLA nonwoven ,then Glass fiber fabrics, plain weave carbon fiber and Kevlar® reinforcement separate RPET / LMPLA nonwoven. The experimental results show that this process can effectively improve the adhesion between layers shortage problem. Also in plain weave carbon fiber reinforcement, polylactide composite plates of electromagnetic shielding effect of up to 40 dB. The Kevlar® plain weave fabric can effectively improve the shortcomings of polylactide composite plate in the top breaking performance.
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Lin, Yan-Ji, and 林延輯. "Fe-based metallic glass powder preparation and additive manufacturing workpiece properties analysis." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/26856326799082501680.
Full textAbstract:
碩士國立中央大學
材料科學與工程研究所
105
The alloy composition of Fe-Cr-Mo-C-B-Y-Co 7 components Fe-based alloy was selected as the master alloy and prepared by vacuum induction melting. Then the alloy ingots were re-melted and fabricated into spherical alloy powder by inert gas atomization process in the Material and Chemical Laboratories, Industrial Technology Research Institute (ITRI, Hsinchu). After size sieving, XRD analysis, and SEM examination, the atomized powders which can meet the specification of additive manufacturing were collected to do the linear laser melting test and cube selective laser melting (SLM) test. Hopefully, the optimum process parameters of SLM that is suitable for additive manufacturing can be designed. After size sieving, the particle size of the most amount powder locates around 37~44 μm. According to the XRD results, all the powders which particle size below 63 μm are confirmed to be amorphous. On contrary, the structure of the powders with particle size more than 63 μm was found to contain an amorphous matrix co-existing with a C23C6, crystalline phase. The intensity of the C23C6 peak increases with increasing the powder size. Meanwhile, a spherical or near-spherical appearance can be clearly observed by SEM examination for all powders. 10 sets parameters of laser power and scanning rate were obtained from the results of linear laser melting test by OM observation. Then these 10 sets parameters and an additional parameter (which can successfully apply on produce maraging steel sample) were applied to do the cube SLM test. After SLM, cracks and spalls were found on the side view of most SLM cubes except the cubes made by the parameters of P240-S650 (#7), P240-S700(#8), and the parameter for maraging steel (#11). However, after the SEM examination on the cube samples made by parameters of #7, #8, and #11, respectively, there still can be found several unmelted powder particles on the surface of cube sample which made by the parameters of #8 and #11. In parallel, the laser melted powder layers of the cube sample made by # 11 parameter exhibit an insufficient fusion condition and the separated powder particles still can be seen on the side view of cube sample. Although there are no unmelted powder on the cube surface and no insufficient fusion condition on the side view for the cube sample made by #7 parameter, but there is one crack throughout the whole cube sample. On the other hand, there are only few unmelted powder particles on the sample surface, no clear separation of laser melted powder layers, and no obvious creaking can be found in the cube sample made by #8 parameter. Moreover, the cube sample made by parameter #8 presents higher hardness than the samples made by the parameters of #7 and #11, which means that the cube sample made by #8 parameter possesses higher product density than the other. In summary, #8 parameter seems the optimum process condition in this study and can be applied as the reference for the further laser additive manufacturing the Fe-based amorphous alloy. Keyword: Fe-based metallic glass, atomization process, additive manufacture
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Fang, Ming-Dar, and 方明達. "Preparation of mesocarbon microbeads for manufacturing high quality carbon/graphite blocks and lithium ion battery anodes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/sf929w.
Full textAbstract:
博士國立高雄應用科技大學
化學工程與材料工程系博碩士班
103
Mesocarbon microbeads (MCMBs), prepared from coal tar pitch, are excellent precursors for carbon materials manufacturing as a result of their liquid crystal properties. As well their excellent compressibility: the β-resin contents, residing on the surface of the MCMBs, promote fluidity and the self-sintering-ability of the clumpy mixtures. Cold isostatic pressing, carbonization and graphitization of MCMBs can be used to prepare high strength, high density isotropic graphite-thereby enabling the direct modeling of objects, while saving on expenditure, due to a reduction in the number of milling/grinding steps needed. However, the techniques needed for the self-sintering of MCMBs are not yet fully developed, due to the various β-resin components on the MCMBs being subject to variation by changes in the preparation procedures. The shapes and particle sizes of the MCMBs affects non-homogeneous sintering reactions; consequently, factors affecting the fluidity of the clumpy mixtures and the production of high-quality of graphite-parts have not been fully clarified and therefore need further investigation. In this work, using variously sized MCMBs mixed with a high β-resin content solid-resin, fixed compositions of β-resin in different graphite products were prepared to explore the effect of the sintering reaction on the resulting products and the relationship between the contacting-pattern of the raw material mixtures and the β-resin contents. The results indicate that the self-sintering reactions of MCMBs have a significant relationship with the contacting-pattern of the raw material mixtures. While MCMBs with higher β-resin contents were found to improve the bending strength of the carbon products, the maximum allowable β-resin contents is still limited as excessive β-resin contents, in addition to giving a reduced product density, will cause the sample mold to burst during sintering. To prepare higher density graphite products, the optimum β-resin content of the MCMB mixtures needed is about 5.0 wt%. Sintered mesocarbon products have high densities and good friction characteristics, but their mechanical strength is still not acceptable. Higher β-resin contents can promote fluidity of the raw materials and also affect neck-formation between the MCMBs, and the product’s, resulting in alterations to the product’s strength. Therefore we need the maximum allowable β-resin contents to be increased. In this paper, carbon black (CB) and glycidyl methacrylate (GMA) were used as a joint reaction-promoter. The sintering behavior of the β-resin was successfully modified to permit an increase in the β-resin contents to 14.4-15.2 wt%, which allowed carbonized carbon blocks with high bending strengths (142 MPa) and high densities (1.87 g cm-3) to be prepared. In this study the organic additives: bisphenol A, GMA and CB were used as promoters to modify the sintering behavior of MCMBs with additional heat treatment (2800°C) to prepare high performance graphite blocks. The disadvantages of graphite-containing inorganic additives typically manifest as decline in the desired properties of the original graphite composite’s high thermal and electrical conductivity, low coefficient of friction and excellent stability. Pure graphite blocks with high electrical conductivities (892 S cm-1), high bending strengths (62 MPa) and high densities (2.156 g cm-3) were prepared in this study. This study showed an improvement in MCMBs, with low β-resin contents, when used as anode materials in high C-rate LIBs. The results showed that the mesophase soft carbon, made from MCMBs at 1300°C, has a wider interlayer spacing compared to mesophase graphite, made from MCMBs at 2800°C, and is highly oriented in comparison with commercial hard carbon, giving it the best high C-rate charge and discharge capacity. These facts indicate that the mesophase soft carbon produced at lower temperatures can be an economical choice for high C-rate LIBs anode materials.
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Lin, Meng-Shinan, and 林孟萱. "Preparation of polyurethane adhesive from polyhydric alcohol liquefied wood and the manufacturing of low-density particleboard." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/63760183324896021623.
Full textAbstract:
碩士國立中興大學
森林學系
93
Taiwan acacia (Acacia confusa) and China fir (Cunninghamia lanceolata) wood were liquefied using PEG-glycerol co-solvent with H2SO4 as catalyst. In preparation of polyurethane (PU) resins, the liquefied woods were blended with three kinds of isocyanate, such as PMDI, Desmodur L and Desmodur N. The effects of liquefied wood species, isocyanates, NCO/ (OH+COOH) ratios (R ratios), surfactant and catalyst on the properties of PU resins were investigated. The feasibility of these PU resins for wood gluing and low density particleboard manufacturing were investigated. From the results, PU resins with liquefied woods as base ingredients could cure at room temperature. The gel time of PU resins prepared from PMDI was the shortest, but prepared from Desmodur N was the longest. The gel time extended as the R ratios increased, but shortened as catalyst added. The effect of surfactant on gel time was not obvious. Solvent resistance test showed high degree of weight retention for these PU resins, among which, PU resins made from Desmodur N had the highest retention rate, and it could be increased as the R ratio increased. DSC thermoanalysis showed that the cured PU films could undergo further cross-linking reaction at high temperature. FT-IR analysis showed that urethane bond had formed between liquefied woods and isocyanate. PU resins prepared from liquefied Taiwan acacia- Desmodur L had the best film tensile strength and wood bonding strength. As the R ratios increased, the tensile strength and bonding strength of all PU resins were increased. When the liquefied wood-isocyanate was used as the binder for the manufacturing of low density particleboard, processing with hot-pressing was necessary, but the hot-pressing temperature and time could be lowered and shortened if catalyst was added. Low density particleboard made with PMDI had higher internal bonding strength and better dimensional stability than with others isocyanates. When the R ratio of liquefied wood-isocyanate increased, the internal bonding strength and dimensional stability would be increase for all particleboards. Increasing the amount of foaming agent could improve the internal bonding strength and dimensional stability of low density particleboards made with the binders of PMDI and Desmodur L. The properties of particleboard made from liquefied Taiwan acacia were better than liquefied China fir. Veneer overlay could increase the bending strength of low density particleboard and reached the type 8 standard in CNS 2215.
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Chen, Yi-Chun, and 陳奕君. "Preparation of PF Resins from Phenol Liquefied Phyllostachys pubesens and Its Application in the Manufacturing of Moldings." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/00005887450345669672.
Full textAbstract:
碩士國立中興大學
森林學系
93
In this study, moso bamboo (Phyllostachys pubesens) was liquefied in phenol by using H2SO4 and HCl as catalyst, and the liquefied moso bamboos were used in the preparation of resol type water soluble PF resins, resol type alcohol soluble PF resin and novolak type PF resins. The synthesis condition of various PF resins and their manufacturing for moldings were investigated. These moldings were carbonized at 800℃ to prepare the carbon materials, and thermal property of these moldings were analyzed, too. Form the results, reaction temperature, kinds and concentration of catalyst and the ratio of phenol to bamboo (w/w) were all influence the liquefaction effect of moso bamboo. The best liquefaction condition was using the ratio of 3/1 of phenol to bamboo and 5 % of H2SO4(aq) and liquefied at 130 ℃ for 30 minutes, the residue of liquefied bamboo was only 1.3 %. FT-IR spectrum of liquefied bamboos showed that the chemical bonds had formed between phenol and components of bamboo. GPC analysis showed that liquefied bamboos had Mw between 1867~3550. When the liquefied bamboos was used in the preparation of resol type water soluble PF resins, bath the bind of liquefied bamboo and synthesis condition would influence the viscosity variation of resins at the stage of synthesis and gel time of prepared resins. When used in the manufacturing of plywood, C-1 that prepared from the liquefied with the ratio of 3/1 of phenol to bamboo (w/w) and using 10% of HCl as catalyst and liquefied at 120 ℃ for 60 minutes had the best bonding strength. The adequate synthesis conditions for resol type alcohol soluble PF resins made form liquefied bamboos were using the molar ratio of F/P 1.2/1 and ammonia solution of 10/1 (mL/mole). Before synthesis process, liquefied bamboo should mixed with formalin, 15g of 40 % NaOH(aq) and third ammonia solution, and then heating to 65 ℃ for 60 min, followed added the remain ammonia solution, and heating to 80 ℃ for 20~30 min. The molding of resol type alcohol soluble PF resins should be made by heating to 80 ℃ for 24 hr first, and then heating to 135 ℃ for 0.5 hr. The weight retention of these moldings after solvent resistance test was 92.5~99.7 ％. Novolak type resin made form liquefied bamboos should be synthesized with the method used for RF resin. The weight retention of these moldings after solvent resistance test was 94.8~100.0 ％. TGA analysis results showed that moldings made form resol type alcohol soluble PF resin had the highest char yield, and resol type water soluble was next, novolak resins is the lowest. Carbonization of various moldings with 800 ℃, the yield of moldings made form resol type alcohol soluble resins was highest, and the novolak type was next. The higher heating rate used the lower carbon yield would be.
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Keng-MingWu and 吳耿名. "The Use of Lean Management Principles for the Blast Furnace Blow-in Preparation Process from Iron-making Manufacturing." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/92334249054541426706.
Full textAbstract:
碩士國立成功大學
工程管理碩士在職專班
103
Steel industry is one of the important foundation industries, it also significantly affect Taiwan's economic. In this case study, the steel company has four blast furnaces, each furnace shuts down every four months for regularly repair. Therefore, shortening the blow-in preparation time can save costs and increase productivity. This study that based on lean management principle uses value stream map and 5S method to remove the waste of the blast furnace blow-in preparation process from Iron-making manufacturing. Comparing the current-state value stream map with future-state value stream map shows the lead time is shorten from 92.3 minutes to 65.6 minutes, and the manpower is saved from 12 persons to 6 persons. After implement Seiri and Seiton, people put the mark on the stuff for name, limit of inventory and location. Thus, operator can easily find tools and work faster. Doing Seisou and Seiketsu keeps work site clean and clear. People can work in a comfortable condition and feel respected. In conclusion, this study tries to prove that lean management principle can also be used in steel industry which is a large-volume and small-variety production to shorten the blast furnace blow-in preparation time. If top management determine to introduce lean management principle into company and make a successful case to be a model, lean thinking can be spread in the others field. Therefore, the waste will be eliminated and the competitive power will be enhanced.
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WANG, LIEN-JEN, and 王連任. "Study on Preparation and Manufacturing Process of UV curing Formulation of High Performance Hard Coatings by way of Roll-to-Roll Precision Printing and Coating Technology." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/p753kr.
Full textAbstract:
碩士世新大學
圖文傳播暨數位出版學研究所(含碩專班)
107
Taiwan’s printing industry has made great progress in the green manufacturing process reform in recent years, especially in the Roll to Roll light-weighting technology. As a tendency of heavy demands by both Thinning and high production capacity for film coating, to increase the efficiency of film surface with scratch resistance by utilizing the UV curing technology thus becomes significant importance. Nevertheless, operating the thin and high hardness coating material in a narrow space easily lead to the film of surface damages cause in poor coating process or poor coating flatness. For that reason, the film mechanical properties turn out to be the significantly designing parameters when obtaining optimum coating performance. For the coated or printed substrate, SKC SH88H PET optical film is selected for SKC Jiangsu High Tech Plastics Co., Ltd., TORAY UY42 PET optical film for TORAY Yihua TORAY Polyester Film Co., Ltd., (YTP) and SHINKONG C879 Optical Film for Shinkong Materials Technology Co., Ltd., a subsidiary of Shinkong synthetic fibers CORP., and Nan Ya CH995Y optical film are PET products produced by Nan Ya Plastics Corporation. All films of thickness are 100μm and the surfaces are pre-coated with Primer. This thesis refers to pencil hardness test method combined with abrasion resistance and so on integrates full spectrum transmittance test with UV curing synthetic composition and micro gravure coating with non-contact drying technology, so as to obtain high price-performance Ratio. When the physical properties and mechanical behaviors of the plastic materials as well as planning of process integration are profoundly understood and correctly chosen at the beginning of designing the hard coating structure, it is also to prevent the occurrence of poor coating process and poor coating flatness. The purpose of the research is to use of green coating materials without VOCs. All materials do not affect the basic principles of environment and health. Hope on the process and products can meet the green products of the green industry.