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Dissertations / Theses on the topic 'Ring valve'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Hepples, Mark Thomas. "Development of an acellular annuloplasty ring for atrioventricular valve repair." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/11170/.

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Annuloplasty is a common technique used for repair of the mitral valve. It is hypothesised that an acellular biological ring may provide a superior solution by encouraging tissue integration and improved annular dynamics whilst offering similar structure and composition to the native annulus. Human mitral valve annuli (n=3) were characterised using histological methods to reveal the histoarchitecture of the native tissue. The histological features of porcine mitral valve annuli (n=5) were compared to the human annuli, as an alternative source of tissue. Haematoxylin and eosin, alcian blue and

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2

Sadeghi, Malvajerdi Neda. "Preliminary Analysis of an Internal Annuloplasty Ring for the Aortic Valve." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36142.

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Among the four valves of the heart, the aortic valve (AV) is frequently affected by disease. When progressive dilatation of the valve produces a leak when the valve should close (regurgitation), repair may be possible. AV repair is a desirable option because, contrary to AV replace-ment using a prosthesis, it does not require life-long anticoagulation treatment, and retains the original tissues that naturally combat structural degradation. All the AV repair procedures developed by cardiac surgeons require a good stabilization of the ventriculo-aortic junction (VAJ) diameter, through annuloplas

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Baxter, Iain A. "Finite Element Modeling of the Mitral Valve and Mitral Valve Repair." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/22876.

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As the most commonly diseased valve of the heart, the mitral valve has been the subject of extensive research for many years. Prior research has focused on the development of surgical repair techniques and mainly consists of in vivo clinical studies into the efficacy and long-term effects of different procedures. There is a need for a means of studying the mitral valve ex vivo, incorporating patient data and the effects of different repair techniques on the valve prior to surgery. In this study, a method was developed for reconstructing the mitral valve from patient-specific data. Three-dimens

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4

Bertin, Michael. "Piezoelectric actuation of an aero engine fuel metering valve." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.723329.

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Servo valves are used in a broad variety of flow modulation applications. In the field of aerospace, servo valves are used in aero engines to meter fuel flow. The existing valves are labour intensive to manufacture and highly optimised such that to achieve improvements in performance requires a novel design. This research investigates smart material actuators and valve concepts. Specifically, a prototype pilot stage nozzle flapper valve is developed for the purpose of actuating a main stage spool. The typical nozzle flapper type servo valve uses a torque motor to actuate the flapper. In this r

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5

Пчелінцев, Віктор Олександрович, Виктор Александрович Пчелинцев, Viktor Oleksandrovych Pchelintsev та Н. О. Зоренко. "Підвищення опору ударно-циклічним навантаженням титанових сплавів пластин кільцевих клапанів". Thesis, Вид-во СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/6353.

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6

Baggio, Mayarha Patricia Dequigiovanni. "Susceptibilidade do piloro de Bombyx mori (Lepidoptera, bombycidae) ao bombyx mori multiple nucleopolyhedrovirus." Universidade Estadual do Oeste do Parana, 2013. http://tede.unioeste.br:8080/tede/handle/tede/635.

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Made available in DSpace on 2017-07-10T14:17:04Z (GMT). No. of bitstreams: 1 Mayaha.pdf: 4416602 bytes, checksum: 8b663982eaff70076dc570733618b841 (MD5) Previous issue date: 2013-08-01<br>Bombyx mori multiple nucleopolyedrovirus (BmMNPV) is an entomopathogenic virus of the Baculoviridaefamily, genera Alphabaculovirus, which infects the silkworm (Bombyx Mori) and causes nuclear polyhedrosis disease. This virus is poliorganotrophic and a series of tissues are known as targets; however, literature does not present information in regards to the pylorus, segment of the hindgut, present in the tra

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7

Musil, Tomáš. "Projekt automatizace montáže drobných dílců." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401015.

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The thesis deals with the possibilities of pre-assembly automation overflow valves at Bosch Diesel s.r.o. in Jihlava. At the beginning, you will find an introduction to the company's production portfolio and an explanation of where and for what purpose the overflow valve is used. This is followed by an analysis of the type spectrum of overflow valves and a description of the differences of individual components. The thesis also deals with time analysis of current working time using MTM analysis and description of existing assembly process. After this research, processes suitable for automation

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8

Forsberg, Peter. "Combustion Valve Wear : A Tribological Study of Combustion Valve Sealing Interfaces." Doctoral thesis, Uppsala universitet, Tillämpad materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-204636.

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The exhaust valve system of combustion engines experiences a very complex contact situation of frequent impact involving micro sliding, high and varying temperatures, complex exhaust gas chemistry and possible particulates, etc. In addition, the tribological situation in the exhaust valve system is expected to become even worse due to strict future emission regulations, which will require enhanced combustion and cleaner fuels. This will substantially reduce the formation of combustion products that might ease the contact conditions by forming tribofilms on the contacting surfaces. The lack of

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9

Ranatunga, Padmasiri Vipul. "Modeling of profile ring rolling with upper bound elemental technique." Ohio : Ohio University, 2002. http://www.ohiolink.edu/etd/view.cgi?ohiou1178730881.

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10

de, Brun Mangs Jonathan, and Mikael Tillquist. "Evaluation of a Programmable Hydraulic Valve for Drill Rig Applications." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-148675.

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The increase of intelligent systems can be seen in every industry. Integrated sensors and processors are used with internal control systems to create better performance for mobile hydraulic applications. The report describes how an evaluation was made to see if the productivity of a drill rig could be increased. This was done by implementing a programmable hydraulic valve to control the hydraulic drilling functions. The productivity would be increased by reducing the downtime due to jamming in the drill hole. Jamming occur when the system does not compensate for changes in rock conditions. By

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11

Markonda, Raviteja, and Pratikchandra J. Vasava. "IMPROVED DESIGN FOR HYDRAULIC VALVE AND HYDRAULIC VALVE TESTING RIGIMPROVED DESIGN FOR HYDRAULIC VALVEAND HYDRAULIC VALVE TESTING RIG : DESIGN AND PRODUCT DEVELOPMENT." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-29534.

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The hydraulic testing rig is a machine that is used to test the hydraulic valves.The present testing rigs are used according to only some particular specification, but in ourproject we have developed a process and implemented the idea for building a UniversalHydraulic Testing Rig which can be able to test any kind of valves with simple adjustments.The hydraulic valves are mainly designed to carry out the flow of the hydraulic fluid with thedesired pressures. But it is observed that there are many pressure losses in the flow whichleads to the unreached flow pressures as expected. In a pre-proje

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12

Vaitsiakhovich, Tatsiana S. [Verfasser]. "Boundary value problems for complex partial differential equations in a ring domain / Tatsiana Vaitsiakhovich." Berlin : Freie Universität Berlin, 2008. http://d-nb.info/1023022184/34.

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13

Sandberg, Dick. "Value Activation with vertical annual rings - material, production, products." Doctoral thesis, Linnéuniversitetet, Institutionen för teknik, TEK, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-19082.

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14

Sandberg, Dick U. W. "Value activation with vertical annual rings : material, production, products /." Stockholm, 1998. http://www.lib.kth.se/abs98/sand1215.pdf.

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15

Ofune, MacDonald Azubuike. "Development of single cam rig for accurate simulation of valve train tribochemistry." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/16782/.

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The study of cam-tappet tribochemistry is on the rise due to the need for a better understanding of how nanoscopic tribofilms reduce friction (improved engine efficiency) and wear (durability) in internal combustion engine. Environmental legislation on exhaust gas emissions have further stimulated research on the use of less phosphorus and sulphur containing additives because phosphorus clogs the catalytic converters in an engine exhaust system. Current tests evaluate the resultant surface films formed on the contact by the additive package which has made understanding of the test conditions c

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16

Shupeyeva, Bibinur [Verfasser]. "Some Basic Boundary Value Problems for Complex Partial Differential Equations in Quarter Ring and Half Hexagon / Bibinur Shupeyeva." Berlin : Freie Universität Berlin, 2013. http://d-nb.info/1036872653/34.

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17

NAJAFABADI, F. ADELNIA. "EFFECTS OF SPIN VALUE AND TOPOLOGY ON THE SPIN DYNAMICS OF ANTIFERROMAGNETIC MOLECULAR RINGS UNRAVELLED BY ¹H NMR." Doctoral thesis, Università degli Studi di Milano, 2016. http://hdl.handle.net/2434/379547.

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The research outcomes reported in the present work are focused on the understanding of the magnetic properties and the spin dynamics of molecular Antiferromagnetic (AFM) rings. The experimental investigation was performed mainly by proton Nuclear Magnetic Resonance (NMR) as a function of temperature and applied magnetic field. The systems investigated include semi-integer spin Cr-based AFM rings, both closed (i.e. Cr₈, Cr₉) and open ones (i.e. Cr₈Zn, and Cr₇Cd), and integer-spin V-based AFM rings, namely V₇Ni and V₇Zn. The results are analyzed separately for three different temperature region

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18

Sarto, Cibely Galvani [UNESP]. "Aspectos ultrassonográficos hemodinâmicos hepáticos e renais em cães com doença degenerativa crônica da válvula mitral." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/140265.

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Made available in DSpace on 2016-07-01T13:10:37Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-12-04. Added 1 bitstream(s) on 2016-07-01T13:14:16Z : No. of bitstreams: 1 000866930_20171204.pdf: 151813 bytes, checksum: 5891c0f5459b827277f3fbcf1b192a23 (MD5) Bitstreams deleted on 2017-12-08T12:00:19Z: 000866930_20171204.pdf,. Added 1 bitstream(s) on 2017-12-08T12:01:09Z : No. of bitstreams: 1 000866930.pdf: 1291614 bytes, checksum: d2bf753766399d454c170a4db80890aa (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>A doença degenerativa crônica da válvula m

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Sarto, Cibely Galvani. "Aspectos ultrassonográficos hemodinâmicos hepáticos e renais em cães com doença degenerativa crônica da válvula mitral." Botucatu, 2015. http://hdl.handle.net/11449/140265.

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Orientador: Maria Jaqueline Mamprim<br>Banca: Maria Lucia Gomes Lourenço<br>Banca: Noeme Sousa Rocha<br>Banca: Raquel Sartor Marcelino<br>Banca: Maria Cristina Ferrarini Nunes Soares Hage<br>Resumo: A doença degenerativa crônica da válvula mitral é a doença cardíaca com maior frequência e uma das causas da insuficiência cardíaca em cães. O objetivo do estudo foi descrever e comparar nos rins, velocidade de pico sistólico, velocidade diastólica final, índice de resistividade e índice de pulsatilidade das artérias renais e interlobares; e no fígado as dimensões, áreas e relações da artéria aorta

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20

Plášek, Jan. "Statická analýza částí potrubních systémů z termoplastů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-390287.

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Thermoplastic materials have significant nonlinear behaviour. The nonlinear behaviour is described by creep curves. The curves of creep modules are dependent on stress, temperature and time. The dissertation thesis deals with the approximation of the creep modules by Prony series. Subsequently three procedures are proposed to take account of creep modules. The proposed procedures are used in two applications. The first application deals with the ring stiffness value of a corrugated sewage pipe. The ring stiffness value is influenced by the creep modulus. The other one deals with a thermoplasti

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21

Sirico, Luis Henrique Albernaz. "Os aldeamentos de agricultores ceramistas: o caso do GO-Ja.33 sítio Jaguarundi, sudoeste goiano." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/71/71131/tde-19082010-105203/.

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Esse trabalho busca compreender como ocorreu a ocupação do sítio Jaguarundi, com ênfase no estudo das escolhas técnicas inseridas na confecção dos artefatos arqueológicos, da paisagem arqueológica, da dieta alimentar e do padrão de assentamento. Procura-se estudar comparativamente os dados arqueológicos, históricos e etnográficos da região de modo a elucidar sobre o processo histórico do contexto de ocupação e as dinâmicas sócio-culturais empreendidas pelas populações que ali se estabeleceram, para tanto o estudo se centrou na identificação das estruturas arqueológicas para que elas possam ser

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22

Gunyan, Scott Nathan. "An Examination into the Statistics of the Singular Vectors for the Multi-User MIMO Wireless Channel." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd539.pdf.

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23

Fourie, Willem Cornelius Jacobus. "Inkomstebelasting van veeboere : 'n vergelykende analise in geselekteerde lande / W.C.J. Fourie." Thesis, North-West University, 2010. http://hdl.handle.net/10394/4597.

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The current South African tax system offers livestock farmers a variety of forms of relief. There are also certain aspects that do not make it so advantageous to be regarded as a farmer by the tax collector. A large number of farmers emigrate to other countries without knowing how the tax systems of those countries function or how much tax they will have to pay. With these factors in mind the question arises concerning how other countries tax their livestock farmers and what relief is provided to them. The objective of this research is to examine and compare the theoretical tax legislation of

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24

Lekeš, Pavel. "Automatizace trati pro měření vodních ventilů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220002.

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My diploma thesis describes upgrade of flowbench serving as test rig for regulation valves characteristic measurement. At the beggining, there is an introduction to the water regulation valves theory followed by current machine condition description. Next chapter defines needed improvements and at the end follows proposition of improvements and necessary component definition and final realization. Final chapter summarizes complete project.

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25

Pontén, Stina. "I like it dirty." Thesis, Konstfack, Ädellab, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-6391.

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Using dirt and cleaning as a point of departure, I have examined how categorization and intentionality affects our perception of value. The work is partly performative in its nature where this performativity sets the limelight on the transition between categories: From dirt to craft, from irrational behaviour to art. In the artistic process, I have used coffee rings on table cloths, shoeprints on wallpapers and the act of mopping as a means of questioning. Through this, I also reveal and question hierarchies in society. The essay discusses and theoretically relates to the artistic work.<br>Me

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26

Lin, Yi-Hao, and 林羿豪. "The Value of Membership of Ring back tone advertising by Using Hierarchical Bayesian Analysis." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/38776694374433974828.

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碩士<br>國立臺灣大學<br>國際企業學研究所<br>102<br>Our research is aimed at constructing the valuable module of membership by analysis the record of phone communication and data base generated from advertisement as viewing each membership as the independent heterogeneity. It believes that playing the different type of advertisement will impact on the profit, which means that the valuable advertisement will bring in more profit. Therefore, the goal of research is diving the constructer of phone communication of membership versus different type of AD. We also find the correlation between the variation of member

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27

Wang, Ping-Yuan, and 王炳淵. "The Effects of the Sewing Ring to the Flow Downstream of the Bileaflet Aortic Mechanical Heart Valves." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/14392704147647551614.

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碩士<br>淡江大學<br>水資源及環境工程學系<br>86<br>This study was focused on how the height of the sewing ring of bileaflet artificial heart valves and exit angle of the tallest sewing ring affect the downstream flow field with a peak discharge of 30 l/min . The models used in the experiments had sewing rings ranging from 12.4 mm to 29.6 mm in height, which is about twice the size of the St. Jude Medical (SJM) and On-X valves , respectively, and exit angles ranging from 78° To 98°. Each model was tested wi

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28

Pinto, Gustavo Oliveira Antunes. "Implantação de um escritório de gestão projetos utilizando o framework PMO Value Ring: estudo de caso Jupiter Systems & Solutions." Master's thesis, 2021. http://hdl.handle.net/10284/10584.

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Jupiter Systems & Solutions é uma empresa do setor das Tecnologias de Informação, com ênfase em desenvolvimento de software. Devido ao seu crescimento em número de clientes e, consequentemente, de projetos resultantes do aquecimento global do mercado de TI, a empresa sentiu necessidade de uma área organizacional que pudesse coordenar as linhas de serviço de forma a permitir o seu crescimento com alicerces sólidos, focado em melhorar os níveis de desempenho, qualidade e custo dos serviços prestados, além de garantir que os trabalhos realizados pela Diretoria de TI estivessem alinhados com os ob

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29

VOHRADSKÁ, Zuzana. "Pohádky K. J. Erbena z pohledu teologické antropologie." Master's thesis, 2017. http://www.nusl.cz/ntk/nusl-385150.

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The core thesis is an attempt to contextual interpretation of fairy tales K. J. Erben from the perspective of theological anthropology. And in the context of the overall issue of fairy tales then they found values that can be picked up and interpreted in this way. Own interpretation precedes five theoretical chapters where first discuss the issue of fairy tales, their typology, origin and development. And about the specifics of time and formation by K. J. Erben. Homer and J. R. R. Tolkien become the inspiration for subsequent interpretation. Both works have been interpreted by Christian. Integ

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