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Dissertations / Theses on the topic 'Pressure forming'

Author: Grafiati

Published: 5 June 2025

Last updated: 16 July 2025

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1

Cowley, Marlise Sunne. "Optimising pressure profiles in superplastic forming." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/61288.

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Some metals, such as Ti-6Al-4V, have a high elongation to failure when strained at certain rates and temperatures. Superplastic forming is the utilisation of this property, and it can be used to form thin, geometrically complex components. Superplastic forming is a slow process, and this is one of the reasons why it is an expensive manufacturing process. Localised thinning occurs if the specimen is strained too quickly, and components with locally thin wall thickness fail prematurely. The goal of this study is to find a technique that can be used to minimise the forming time while limiting the

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2

Kamal, Manish. "A uniform pressure electromagnetic actuator for forming flat sheets." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1127230699.

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Thesis (Ph. D.)--Ohio State University, 2005.<br>Title from first page of PDF file. Document formatted into pages; contains xxi, 261 p.; also includes graphics (some col.). Includes bibliographical references (p. 244-254). Available online via OhioLINK's ETD Center

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3

Wezka, Kamil. "Pressure induced structural transformations of network forming glasses." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608339.

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The method of in situ high pressure neutron diffraction was employed to measure reliable diffraction patterns to help illuminate the density-driven structural transformations in GeO2, SiO2, B2O3 and GeSe2 glass. The majority of this neutron diffraction work employed the diffractometer D4c at the ILL with a Paris-Edinburgh press which enabled the pressure range from ambient to 8 GPa to be accessed. In the cases of GeO2 and GeSe2 glass, the neutron diffraction with isotopic substitution (NDIS) protocol was developed to provide benchmark experimental results to test the results obtained from vari

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4

Andersson, Andreas. "Measuring the contact pressure during sheet metal forming of automotive components." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-20630.

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The competition in the car market in the world is continuously intensifying. To gain an advantage in the market while making a profit, each car manufacturer needs a strong focus on always improving in the technology development. It is not just technology of the cars that need development, but it is equally important to improve the manufacturing processes itself. In the end, this will result in more appealing products for the customer at a competitive cost. The aim and scope of this master thesis is to get a deeper understanding of the forces in the stamping die during sheet metal forming in ma

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Banik, Kristin Elizabeth. "FACTORS EFFECTING ELECTROMAGNETIC FLAT SHEET FORMING USING THE UNIFORM PRESSURE COIL." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1211900988.

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6

Cai, Sheng [Verfasser]. "Tailored and double-direction pressure distributions for vaporizing-foil forming / Sheng Cai." Aachen : Shaker, 2016. http://d-nb.info/1104048035/34.

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7

Santibanez, Rodrigo. "The effect of high hydrostatic pressure on histidine decarboxylase and histamine forming bacteria /." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=101172.

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Increasing consumer demand for fresh fishery products with minimized loss of their nutritional properties is forcing food industry to look for alternative technologies to maintain the fresh attributes, stability and safety of foods. Demand for fresh tuna fish is no exception, being a valuable source of nutrients with immense health benefits. However, this product is highly perishable and has been commonly implicated in scombroid (histamine) poisoning caused by microbial decarboxylation of histidine contained in high levels in the tissues of scombroid fishes. Current techniques are inadequate f

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8

Merrygold, Egil W. "An investigation into differential heating, contact pressure and friction in metal forming processes." Thesis, University of Bath, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403356.

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9

Shulkin, Leonid Boris. "Design for temporal and spatial variation of blank holder pressure in sheet metal forming /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487945320759331.

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10

Holmqvist, Claes. "Modelling of the pressure distributions in twin-wire blade formers." Licentiate thesis, KTH, Mechanics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1490.

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<p>During papermaking, the internal structure of the fibrenetwork constituting the paper is to a dominating extentdetermined in the forming zone of the paper machine. Thisthesis is aimed at studying the pressure distribution in bladeforming sections, which is commonly considered to be a keyquantity of the process.</p><p>Previous work has provided insight into the physics ofdifferent devices employed in blade forming. However, there hasbeen a lack of models enabling studies of the effects of theinteraction between different components on the pressuredistribution. In the thesis, a model is prese

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11

Lanzon, Joseph, and kimg@deakin edu au. "EVALUATING LUBRICANTS IN SHEET METAL FORMING." Deakin University. Department of Science and Engineering, 1999. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20040428.095238.

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The sheet metal forming process basically involves the shaping of sheet metal of various thickness and material properties into the desired contours. This metal forming process has been extensively used by the automotive industry to manufacture both car panels and parts. Over the years numerous investigations have been conducted on various aspects of the manufacturing process with varied success. In recent years the requirements on the sheet metal forming industry have headed towards improved stability in the forming process while lowering environmental burdens. Therefore the overall aim of th

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12

Jadhav, Jagdish. "FE Modeling of Cushion 3D Motion for Sheet Metal Forming Simulation." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-18873.

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Nowadays FE-simulations for sheet metal forming process are used to reduce the tryout phase in automotive industries. But the complex forming simulation processes are very challenging. One of the challenges is to create an FE-model which can be used to analyze the effects of cushion motion on the forming process. This thesis is focused on creating an FE model for two dies single cushion sheet metal forming press which can be used to analyze the effects of cushion motion on the contact pressure between the stamping tools and blanks. Using LS-PrePost a model with rigid stamping tools and cushion

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13

Holmqvist, Claes. "Mechanical modelling of blade forming and drainage of flocculated suspensions." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-141.

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14

Mary, Charlotte. "Physico-chemistry, high pressure rheology and film-forming capacity of polymer-base oil solutions in EHL." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0013/document.

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Le développement de lubrifiants à haute valeur ajoutée subissant des conditions opératoires de plus en plus draconiennes, économes en carburant et performants pendant une longue durée reste un défi considérable pour les fabricants d’huiles. Cette thèse concerne l’étude du rôle et des actions des améliorants d’indice de viscosité (ou Viscosity Index Improvers (VII)) dans les lubrifiants moteurs. Le premier objectif visé dans ce travail est la caractérisation des comportements rhéologiques et la modélisation de la viscosité en fonction de conditions réelles de température, pression et contrainte

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15

Niss, Kristine. "Fast and slow dynamics of glass-forming liquids : what can we learn from high pressure experiments ?" Paris 11, 2007. http://www.theses.fr/2007PA112022.

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Il a été montré durant la dernière décennie que la fragilité qui traduit le caractère plus ou moins non-Arrhénien d'un liquide, peut être correlée à de nombreuses propriétés de ce liquide et de son verre. Dans ce travail, des critères de test de ces corrélations utilisant la pression comme nouveau paramètre extérieur ont été mis au point. Ils ont été appliqués à l'étude d'un nouveau jeu de données obtenu pendant ce travail. On a particulièrement étudié la largeur du pic de relaxation alpha par spectroscopie diélectrique, l'intensité relative du pic de bose et le déplacement carré moyen par dif

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森, 敏彦, Toshihiko MORI, 健治広田 та ін. "PCR加工による異種材質円管の重ね圧接". 日本機械学会, 2000. http://hdl.handle.net/2237/9034.

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17

Madloch, Sonja [Verfasser]. "Effect of Pressure on Metal Dusting and the Protection of Affected Materials by Oxide Forming and Catalytically Inhibiting Diffusion Coatings / Sonja Madloch." Aachen : Shaker, 2018. http://d-nb.info/1186590521/34.

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18

Parakala, Shilpha R. "EIS Investigation of Carbon Dioxide and Hydrogen Sulfide Corrosion Under Film Forming Conditions." Ohio University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1125871582.

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19

Janoušek, Jiří. "Návrh výroby pouzdra tlakového filtru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445150.

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The project presents a proposal for the technology of production of the pressure filter casing used in hydraulic systems, which is made of non-alloy carbon steel 12 020. With the help of a literature study of cold extrusion and calculations, the production of the component was designed, which will take place in two operations. Before each operation, the surface treatment is performed by phosphating and soaping and inter-operational annealing must take place. Tool sets were designed for both operations and a press was selected from the company's machine park with a nominal force of 25,000 kN. F

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Folle, Luís Fernando. "Estudo do coeficiente de atrito para processos de estampagem." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/76155.

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O atrito na interface entre a peça e a ferramenta tem considerável importância em operações de estampagem de chapas, são necessários conhecimentos precisos sobre processos de conformação de chapas para a análise e projeto de novas peças e ferramentas, assim como para validação de uma simulação numérica. Este trabalho usa o método de determinação do coeficiente de atrito em estampagem através do ensaio de dobramento sob tensão e avalia sua precisão com o uso do software de elementos finitos LS-DYNAFORM, específico para esse processo de fabricação. Como existem seis equações que calculam o coefi

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Sofi, Khadija. "Optimisation du générateur d'impulsions magnétiques et adaptation énergétique des machines pour les besoins d'assemblage innovants multi-matériaux." Electronic Thesis or Diss., Amiens, 2021. https://theses.hal.science/tel-03856084.

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Les générateurs d'impulsions magnétiques sont de plus en plus exploités dans les applications de formage et soudage multi-matériaux. Ils permettent de réaliser une formabilité précise des pièces métalliques. Cette thèse a pour objectif de calculer, par des méthodes analytiques, le champ et la pression magnétiques ainsi que la force de Lorentz générés durant le magnétoformage d'un tube. Premièrement, nous proposons d'analyser le fonctionnement du générateur en utilisant une bobine massive et un concentrateur de champ magnétique. Ensuite, nous introduisons les modèles 3D de ces éléments, en util

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22

Singhal, Hitansh. "Formability Evaluation of Tailor Welded Blanks (TWBs)." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1594916942734335.

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23

Ntsendwana, Bulelwa. "Advanced low temperature metal hydride materials for low temperature proton exchange membrane fuel cell application." Thesis, University of the Western Cape, 2010. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_8494_1307431585.

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<p>Energy is one of the basic needs of human beings and is extremely crucial for continued development of human life. Our work, leisure and our economic, social and physical welfare all depend on the sufficient, uninterrupted supply of energy. Therefore, it is essential to provide adequate and affordable energy for improving human welfare and raising living standards. Global concern over environmental climate change linked to fossil fuel consumption has increased pressure to generate power from renewable sources [1]. Although substantial advances in renewable energy technologies have been made

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24

Seifert, Michael. "Temperiertes Innenhochdruck-Umformen von Rohren aus Magnesium- und Aluminiumlegierungen." Doctoral thesis, Universitätsbibliothek Chemnitz, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200801741.

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Die Anwendungsmöglichkeiten und Potenziale des temperierten Innenhochdruck-Umformens mit flüssigen Wirkmedien (T-IHU) von Rohren aus verschiedenen Magnesium- und Aluminiumknetlegierungen werden in der vorliegenden Arbeit aufgezeigt. Neben der Werkstoff- und Halbzeugcharakterisierung, der Auslegung von temperierten Innenhochdruck-Umformanlagen und –werkzeugen, den Thermografiemessungen am Halbzeug unter Realbedingungen und der Verifizierung der Simulationsergebnisse des T-IHU-Werkzeuges war der inhaltliche Schwerpunkt die systematische experimentelle Bestimmung der maximalen Umfangserweiterung

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Kim, Jae Seong. "Shell-side condensation of vapours forming miscible and immiscible liquids at atmospheric and reduced pressures." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321484.

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Noiret, Christophe. "Modèles éléments finis du pressage, du fluage et du soufflage du verre." Valenciennes, 1996. https://ged.uphf.fr/nuxeo/site/esupversions/c7f770ab-f0a7-47b2-8040-68a6f0458416.

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Pour prévoir et mettre au point la mise en forme d'articles volumiques en verre, les modèles éléments finis et les simulations numériques sont développées pour trois grands procédés : le pressage, le fluage et le soufflage. Par une formulation thermomécanique découplée, les modèles tiennent compte de l'écoulement newtonien du verre en présence des conditions de contact fortement évolutives au cours de la mise en forme ; la convection avec l'air et la conduction avec les outils sont estimes, soit par un modèle éléments finis en formulation implicite, soit de manière originale par un calcul anal

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Bastos, Silvio Cesar. "Efeito do aquecimento por indução eletromagnetica de tubos sem costura utilizados em motores a diesel." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264397.

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Orientador: Sergio Tonini Button<br>Dissertação (mestrado profissional) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-14T09:44:38Z (GMT). No. of bitstreams: 1 Bastos_SilvioCesar_M.pdf: 4555280 bytes, checksum: 806976ee18b42ffb327e7bb279b89f96 (MD5) Previous issue date: 2009<br>Resumo: Este trabalho apresenta um estudo sobre o efeito dos processos de recalque a frio e aquecimento por indução eletromagnética sobre as características da microestrutura e dureza do material de tubo de aço sem costura que é utilizado no transporte de f

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Firdaous, Karima. "Étude des fluides dans une zone sismogénique fossile : les gisements aurifères mésothermaux archéens de Val d'Or, Abitibi, Québec." Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL111N.

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Les gisements d'or hydrothermaux de la région de Val d'Or (Abitibi, Québec) se présentent sous forme de veines de quartz-tourmaline-carbonates-pyrite en cisaillement ou en extension se développant dans et autour de zones de cisaillement inverses EW en régime de compression horizontale NS. La formation de ces gisements a été expliquée par le modèle de valve sismique. Le paramètre essentiel contrôlant la formation de ces veines est la pression fluide, paramètre que nous avons tenté d'appréhender par l'étude des inclusions fluides. Une étude d'inclusions fluides a été entreprise dans les veines d

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Tabibian, Seyedshayan. "Étude expérimentale et modélisation de réacteurs à lit fluidisé de type Wurster couplés à des jets de plasma à pression atmosphérique pour le traitement de surface de particules." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS382.

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Les particules de polypropylène sont utilisées à diverses fins. Cependant, les bonnes propriétés mécaniques du PP sont contrebalancées par une faible mouillabilité. La mouillabilité des particules de PP a donc été améliorée par un traitement par jet de plasma à la pression atmosphérique dans un réacteur à lit fluidisé Wurster. L'énergie libre de surface des particules de PP déterminée par la méthode de Zisman a augmenté de 30,7 mN/m à 38,6 mN/m après 120 secondes de traitement. Les résultats XPS ont montré une augmentation de 5% de la concentration atomique en oxygène à la surface des particul

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Breidenich, Jennifer L. "Impact-initiated combustion of aluminum." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54403.

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This work focuses on understanding the impact-initiated combustion of aluminum powder compacts. Aluminum is typically one of the components of intermetallic-forming structural energetic materials (SEMs), which have the desirable combination of rapid release of thermal energy and high yield strength. Aluminum powders of various sizes and different levels of mechanical pre-activation are investigated to determine their reactivity under uniaxial stress rod-on-anvil impact conditions, using a 7.62 mm gas gun. The compacts reveal light emission due to combustion upon impact at velocities greate

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Björkner, Eva. "Why so different? - Aspects of voice characteristics in operatic and musical theatre singing : Aspects of voice characteristics in operatic and musical theatre singing." Doctoral thesis, KTH, Tal, musik och hörsel, TMH, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4198.

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This thesis addresses aspects of voice characteristics in operatic and musical theatre singing. The common aim of the studies was to identify respiratory, phonatory and resonatory characteristics accounting for salient voice timbre differences between singing styles. The velopharyngeal opening (VPO) was analyzed in professional operatic singers, using nasofiberscopy. Differing shapes of VPOs suggested that singers may use a VPO to fine-tune the vocal tract resonance characteristics and hence voice timbre. A listening test revealed no correlation between rated nasal quality and the presence of

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PROIETTO, Federica. "STUDY OF ELECTROCHEMICAL PROCESSES FOR THE CONVERSION OF CARBON DIOXIDE TO ADDED-VALUE PRODUCTS." Doctoral thesis, Università degli Studi di Palermo, 2020. http://hdl.handle.net/10447/395119.

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Moreau, Philippe. "Nouvelle stratégie pour le formage de produits plats vers une géométrie complexe avec conception assistée par ordinateur modèles éléments finis et métrologie : Application au fluage et pressage de verre plat." Valenciennes, 1994. https://ged.uphf.fr/nuxeo/site/esupversions/fc1970be-0071-4fd7-b31c-fe536a37e53e.

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François, Emmanuel. "Modèles éléments finis du formage du verre par procédés Press-bend et Blow-bend : Optimisation des paramètres process par méthode inverse." Valenciennes, 1997. https://ged.uphf.fr/nuxeo/site/esupversions/0caa37a3-30f2-4654-b2ac-dde557896c18.

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Pour prévoir et mettre au point la mise en forme d'objets en verre à partir de feuilles plates, les simulations numériques par éléments finis sont développées pour deux grands procédés, le Press-bend et le Blow-bend. Ces deux procédés, utilisés actuellement par les fabricants verriers, comportent deux phases essentielles: le pressage et le fluage pour le premier, le soufflage et le fluage pour le second. Ces modes de production nécessitent la maitrise d'un nombre important de paramètres. Les délais de conception et la minimisation des couts de revient limitent le nombre de mises au point expér

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Tomeček, Vojtěch. "Využití metody konečných prvků pro modelování šíření hlasu vokálním traktem a okolo hlavy člověka." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230941.

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This diploma thesis deals with creating of finite element model for the analysis of acustic waves radiation through human vocal tract and through the head surrounding space. The thesis contains a short overview of the anatomy of relevant parts and a short overview of formerly published models relevant to the topic. Then the process of creating the 3D model of human head, including the vocal tract, based on CT scans, and the mesh itself follows. This is succeeded by the computational solution taking in the acount the acoustic absorption of the vocal tract walls and radiation into the open space

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Marulier, Cyril. "Etudes multi-échelles des couplages entre les propriétés hygroélastiques des papiers et leur microstructure." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI090/document.

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L’objectif de ce travail est d’étudier les couplages entre les propriétés hygroélastiques des papierset leur microstructure. L’exploitation d’images de papiers modèles acquises par microtomographieà rayons X a permis de caractériser de manière inédite l’évolution des propriétésmicrostructurales de ces matériaux en fonction de leurs conditions d’élaboration ainsique lors d’essais où ils ont été placés sous atmosphère à humidité relative contrôlée.Ces résultats constituent un apport nouveau pour la connaissance de la nature statistique desdescripteurs des propriétés des fibres (dimensions et ori

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LIU, CHI-HSUAN, and 劉其軒. "The Optimum Forming Analysis For Pressure Relief Setting Nut." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/f5wsqb.

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碩士<br>高苑科技大學<br>機械與自動化工程研究所<br>105<br>Abstract In this study, the forming design and analysis for the pressure relief valve adjust nut are conducted with the billet of AISI 1010, 7.8mm × L86.8mm. The forming process is simulated numerically by using a FEM code, DEFORM 3D; and mtetallographic tests, such as forming stream line, are conducted as well to compare with the numerical results. The original forming design for the pressure relief valve adjust nut is four-station forming and then finished by drilling process. In order to reduce cost, the forming design is modified as five-station formi

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Yu, Shang-Pang, and 尤尚邦. "Dieless Groove Forming by Pulsed Laser Assisted Air Pressure." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/21487207304327868553.

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碩士<br>國立臺灣師範大學<br>機電工程學系<br>102<br>Nowadays, groove tubes are widely used in the electronic cooling module. It is usually drawn which term refers to molding. However, there are limitations while producing the smaller ones. Therefore, this study emphasis on the parameters of dieless forming which affects the shaping of groove on stainless steel that generated by pulsed laser assisted air pressure. In this study, the performance is presented on the basis of standard atmospheric conditions. To begin with, the stainless steel tube is heated by pulsed laser with ambient air surrounded and it soon f

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Tang, Yueh-Ru, and 湯岳儒. "Development of a Micro-Forming Machine UsingViscoplastic Pressure Carrying Medium." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/32413442121223749144.

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碩士<br>國立雲林科技大學<br>機械工程系碩士班<br>89<br>An advance technology different from the traditional hydro-forming method, called the viscoplastic pressure carrying medium process (VPCM Process), has been developed. It is suitable for piercing, blanking and forming processes not only for metal, but also for non-metal sheet. This thesis aim to develop a micro-forming machine, which is capable of continuous operating. Modifications of the exiting rig have been carried out, including a series of redesign and manufacturing of the forming device, the micro-forming die, and the sealing mechanism. The side leaka

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Chen, Bing-hong, and 陳秉鴻. "Adaptive simulation of the hydraulic bulging forming with counter pressure control." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/58083204615374331186.

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碩士<br>國立中山大學<br>機械與機電工程學系研究所<br>93<br>The tube hydro-forming (THF) is an innovative manufacturing process which is used to manufacture many industrial components widely. The success of THF is largely dependent on the selection of the loading paths: internal pressure versus time, axial feeding versus time and counter punch (CP) versus time. The finite element analysis is used to simulate the forming result of different loading paths and reduce the cost of die-testing. This paper presents the forming of T-branches and T-branches components with CP. These paper has developed an adaptive simulatio

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Ten, Hsiang-Ming, and 鄧翔明. "Study on Rotating Forming of Pressure Vessel of SUS304 Stainless Steel." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/51630254812632957650.

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碩士<br>國立高雄應用科技大學<br>模具工程系<br>99<br>This is the first direct use of heat pipe forming between SUS304 stainless steel pressure vessels, not by direct extension forming and multi-pass the traditional trip necking process, consider rotating the mold on it or not, respectively, explore the shape of the rotation difference, pressure vessels, process can be divided into multi-pass forming: forming sealing, forming and necking forming the base can be formed and sealed upon the mold forming necking angular velocity applied to reduce the forging load and the pipe thickness, this study, DEFORM-3D finite

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Fang, Guo-Cheng, and 方國丞. "Fabrication of Arrayed Glass Lens by Gas Pressure/Vacuum Assisted Forming Process." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/73705331474098218347.

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碩士<br>中華大學<br>機械工程學系碩士班<br>97<br>Arrayed glass micro-lenses have numerous applications in the field of opto-electronics. Traditional precision glass molding process is too expensive and molding for arrayed glass lenses is difficult to avoid glass sticking and gas bubbles trapped into glass material. This study developed a new process to produce an arrayed glass micro-lenses by gas pressure assisted forming process, which is considered to have a great potential for the mass production of arrayed glass lenses with low cost, ease of manufacture and free of surface defects. Pyrex glass plates

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Liu, Rui-Chuan, and 劉瑞銓. "Study on Design and Innovation of New Type Vacuum/Pressure Forming Machine." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/4r35rp.

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碩士<br>國立勤益科技大學<br>資訊管理系<br>105<br>During the past 30 years of Taiwanese vacuum forming machinery industry development, Taiwanese companies were pushed to speed up their industry upgrading due to the trend of “The powerful are always powerful “of the plastic industry. This research proposes the development process which is suitable for middle and small Taiwanese company to adopt as low cost and high quality of compact vacuum and pressure forming machine and also based on the concept of disruptive innovation to process systematically innovative R&D to reach the requirement of both low end and hi

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Choirotin, Ismi, and 艾斯美. "Fabrication of Micro-flow Channel with AA5052 by Low-Pressure Superplastic-like Forming." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/99142421823867458477.

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碩士<br>國立中央大學<br>機械工程學系<br>102<br>One of ways to improve Redox-flow batteries or particularly vanadium Redox flow battery (VRB) performance is by increasing micro-flow channels aspect ratio on bipolar plates. Aspect ratio increments are obtained by the increasing of channel depth. There are many research investigate several methods to produce a high aspect ratio of the micro-flow channel on bipolar plate, but it seems a high pressure required in overall forming method. To produce micro-flow channel with high aspect ratio, this research investigates forming pressure and temperature affect into t

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Vanegas, Moller Ricardo. "Design and fabrication of an instrument to test the mechanical behavior of aluminum alloy sheets during high-temperature gas-pressure blow-forming." 2008. http://hdl.handle.net/2152/10498.

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Hydraulic bulge forming has been used as a method to determine the properties of sheet metal alloys in biaxial stretching at room temperature. Gas-pressure bulge forming alleviates the issues of using hydraulic fluids when the tests are conducted at high temperatures (above 200°C). Testing a sheet metal alloy by gas-pressure blow-forming (GPBF) under controlled temperature and pressure conditions requires an accurate and reliable mechanism that delivers repeatable results. It was the purpose of this work to design and implement such an instrument. This instrument should deliver real-time data

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Gupta, Anshu. "Chemical evolution of star-forming galaxies in the overdense environment." Phd thesis, 2018. http://hdl.handle.net/1885/149423.

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As the largest gravitationally bound systems in the Universe, galaxy clusters are a unique laboratory for studying the extremes of galaxy evolution. The general consensus is that the large cluster-scale halo and the hot intracluster medium plays a significant role in the morphological and colour transformation of galaxies. However, its effect on details of baryonic processes in cluster galaxies remains unknown. I use the gas-phase chemical abundance to trace the cumulative effect of the gas inflow/outflow modulated star formation history of a galaxy.

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LI, KUI-YU, and 李奎昱. "The Study of Forming Quality of the Counter Pressure Mechanism on Liquid-assisted Injection Molding." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/q6rnxz.

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碩士<br>中原大學<br>機械工程研究所<br>102<br>Liquid-Assisted Injection Molding(LAIM) is short shot filling plastic melt. When center layer plastic melt under melting state add liquid let finished presented hollow. The purpose is Use hollow forming and liquid feature can reached save materials and upgrade finished quality. In LAIM, The assisted liquid penetration capability is impact process main factor. Liquid penetration capability than gas higher and Incompressibility capability easy produce finished center layer orderless. Impact liquid penetration capability parameters is liquid pressure and temperatur

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Fu, Wen-Yen, and 傅文彥. "The Optical Simulation and High Temperature Gas Pressure Assisted Forming Process of Glass Fresnel Lens." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/83254002575645543976.

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碩士<br>中華大學<br>機械工程學系碩士班<br>99<br>Currently, Fresnel lens is widely used in electromechanical products and daily necessities, such as lighthouse lighting, screens, projector, light, camera, CD-ROM drive, magnifying glass, glasses, alarm and concentrated solar power systems. The material used for manufacturing Fresnel lens nowadays is either PC or PMMA plastic; however, it is unable to withstand high temperature and vulnerable to ultraviolet radiation degradation. It also easily causes scratch defect it is essential to on the surface and results in low performance after long term usage. Hence, d

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Hsieh, Ching-Yu, and 謝靜瑜. "High pressure technology on sterilization to histamine-forming bacteria and preservation application of tuna meat." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ekn6kv.

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碩士<br>國立高雄海洋科技大學<br>水產食品科學研究所<br>106<br>High pressure processing (HPP) is an emerging non-thermal technology that can achieve food safety. The principle advantages of the HPP process is an expanded shelf life due to the inactivation of pathogen. Histamine fish poisoning is a worldwide food-borne intoxication caused by the consumption of seafood containing high histamine contents. This study was to determine the effects of HPP treatments on inhibitory effects of histamine-forming bacteria (HFB) such as Morganella morganii and Photobacterium phosphoreum, and resistance variations were detected b

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Zeng, Siang-Mei, and 曾湘媚. "High pressure processing combined with thyme essential oil on sterilization histamine-forming bacteria and preservation application of marlin meat." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/aa77tf.

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碩士<br>國立高雄科技大學<br>水產食品科學系<br>107<br>Histamine is primarily produced in fish via decarboxylation of free histidine by the activity of various species of histamine-forming bacteria (HFB). Some fish included marlin, tuna, mackerel, and bonito, are the type of fish commonly involved in histamine fish poisoning. High pressure processing (HPP) is an emerging non-thermal technology that can inactivate pathogenic and spoilage microorganisms in food, and extend the shelf life of foods. Plant essential oils components are gaining a wide interest in health industry for their potential as antioxidant and

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