Log in

Relevant bibliographies by topics / Valves / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Valves.

Dissertations / Theses on the topic 'Valves'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Valves.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Anstine, Lindsey J. "Valve cell dynamics in developing, mature, and aging heart valves." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1478692972995079.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Золотова, Світлана Григорівна, Светлана Григорьевна Золотова, Svitlana Hryhorivna Zolotova, and O. I. Sidorets. "Control ball valves." Thesis, Видавництво СумДУ, 2008. http://essuir.sumdu.edu.ua/handle/123456789/16055.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Iredale, Peter David. "Investigation into unsteady valve flow in steam turbine inlet governing valves." Thesis, University of Leicester, 2000. http://hdl.handle.net/2381/30179.

Full text

Abstract:

When partially closed, steam turbine governing valves rely on flow separation from the valve head and seat to generate loss and throttle the flow. The aim of this type of valve is to avoid separation and therefore eliminate loss when the valve is fully open, and to have stable and controllable separations at all other valve lifts. Any significant unsteadiness in the valve flow can result in unacceptable mechanical vibration of the valve, which in extreme cases can lead to failure. Results will be discussed from work that has been undertaken into valve flow instabilities at Leicester University

APA, Harvard, Vancouver, ISO, and other styles

4

Bishop, Winona F. "Hydrodynamic performance of mechanical and biological prosthetic heart valves." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29461.

Full text

Abstract:

One of the major achievements in cardiac surgery over the past 30 years has been the ability to replace severely diseased heart valves with prosthetic ones. The option of using prosthetic heart valves for the treatment of valvular diseases has improved and prolonged many lives. This is reflected in around 120,000 heart valve replacement operations carried out every year in North America alone to correct the cardiovascular problems of stenosis, insufficiency, regurgitation, etc. The development of artificial heart valves depends on reliable knowledge of the hemodynamic performance and physiolo

APA, Harvard, Vancouver, ISO, and other styles

5

Chan, Gene Yel. "Cryopreservation of porcine heart valves." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60420.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Huff, Michael Allan. "Silicon micromachined wafer-bonded valves." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12727.

Full text

Abstract:

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.<br>Includes bibliographical references (v. 2, leaves 429-436).<br>by Michael Allan Huff.<br>Ph.D.

APA, Harvard, Vancouver, ISO, and other styles

7

Heinrich, Russell Shawn. "Assessment of the fluid mechanics of aortic valve stenosis with in vitro modeling and control volume analysis." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/16664.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Cole, Matthew. "Feasibility of miniature polypyrrole actuated valves." Thesis, University of British Columbia, 2006. http://hdl.handle.net/2429/32239.

Full text

Abstract:

Polypyrrole is a conducting polymer that can change in volume as its oxidation state is altered. This change in volume, operable at low voltages, can be used to create small actuating devices. The goal of this thesis is to evaluate the use of polypyrrole for the creation of a low voltage polymer valve and to demonstrate the mechanisms that could be used to create these valves. There are a number of challenges in using polypyrrole in a commercially viable valve; it must be able to withstand large temperature variations, have a high strain (to minimize mechanical amplification), have high

APA, Harvard, Vancouver, ISO, and other styles

9

Sun, Yongbin. "Development of electromagnetic fluid disc valves." Thesis, University of Surrey, 1993. http://epubs.surrey.ac.uk/843323/.

Full text

Abstract:

The development of electrohydraulic floating-disc valves at the University of Surrey started in the early 1980's. The progress in the last ten years since then has shown that floating-disc valves have the advantages of fast response time, reliable operation, simple configurations, few critical dimensions with no precision sliding surfaces, leading to low cost design and manufacture. They have great potential to fill the gap between conventional solenoid valves and high precision servo valves. However, limitations existed in previous designs hindering further development; for instance relativel

APA, Harvard, Vancouver, ISO, and other styles

10

Dana, Seresht Mahmoudreza. "Material Selection for Deepwater Gate Valves." Thesis, KTH, Materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170023.

Full text

Abstract:

Material selection is an important step during the design process of an object. The goal is to produce an object to meet the requirement with minimum cost. During the recent years with discovery of oil and gas in deep water, oil and gas industry facing new challenges of handling corrosive material in seabed that gives more importance and criticality to material selection of equipment for this kind of application. Hydrogen sulfide (H2S), chloride and carbon dioxide (CO2) have made the big challenges for material that handle corrosive fluids in the seabed.This report presents a brief review of m

APA, Harvard, Vancouver, ISO, and other styles

11

Stefanou, Georgios Konstantinos. "Transport properties of lateral spin valves." Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/20697/.

Full text

Abstract:

The current study is focused on the investigation of the spin and heat properties of a Permalloy/silver/Permalloy, Permalloy/silver (doped with Iron)/Permalloy and Vanadium/silver/Vanadium spin valves in a lateral geometry. The presence of a downturn in the spin-signal of these lateral spin valves at low temperatures, below 30 K, can be avoided by depositing the Ag at a faster rate. This will promote a better microstructure that seems to have a crucial role in systems with very low or no magnetic impurities. A small part of the report is dedicated to test the two different behaviours of the sp

APA, Harvard, Vancouver, ISO, and other styles

12

Gadyuchko, Andrey, and Sören Rosenbaum. "Nondestructive quality inspection of solenoid valves." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200756.

Full text

Abstract:

The presented innovative magnetic testing method utilises the fact, that each commercially available electromagnet can not only be used as an actuator, but also comprises internal sensor functions. This allows a huge application variety in the fields of non-destructive testing and condition monitoring of electromagnetic systems during production and within the application in the field.

APA, Harvard, Vancouver, ISO, and other styles

13

Kirkwood, A. D. "Aerdynamic noise generation in control valves." Thesis, University of Manchester, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517180.

Full text

Abstract:

An experimental study into the phenomenon of aerodynamic noise generation in control valves has been performed. Several model representations of control valves have been studied, in addition to making measurements on several full size control valves. A high speed computer based data acquisition system, coupled with miniature high frequency surface mounted pressure transducers, has been used to obtain measurements of both the mean and fluctuating wall static pressures at several locations throughout the length of the flow apparatus. For known flow conditions, it has been possible to determine t

APA, Harvard, Vancouver, ISO, and other styles

14

Ouchet, L. "Reliability modelling of subsea gate valves." Thesis, Cranfield University, 1993. http://dspace.lib.cranfield.ac.uk/handle/1826/11137.

Full text

Abstract:

Offshore Installations comprise complex, expensive and potentially hazardous facilities which need to be maintained and operated in a proper and safe manner. Valves are one of the most widely used components on offshore installations and their reliability is important to both to safety and to the minimisation of down time. During discussions with offshore operators and valve manufacturers on the significance of valve failure to safety, it has been found that valve failures are frequent occurrences and not restricted to a few isolated incidents. The problem is wide spread in the petroleum indus

APA, Harvard, Vancouver, ISO, and other styles

15

Winroth, Marcus. "On Gas Dynamics of Exhaust Valves." Licentiate thesis, KTH, Strömningsfysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202719.

Full text

Abstract:

With increasing effects of global warming, efforts are made to make transportation in general more fuel efficient. When it comes to internal combustion engines, the most common way to improve fuel efficiency is through ‘downsizing’. Downsizing means that a smaller engine (with lower losses and less weight) performs the task of a larger engine. This is accomplished by fitting the smaller engine with a turbocharger, to recover some of the energy in the hot exhaust gases. Such engine systems need careful optimization and when designing an engine system it is common to use simplified flow models o

APA, Harvard, Vancouver, ISO, and other styles

16

Kazadi, Dieudonne Matang'a. "Non-Newtonian losses through diaphragm valves." Thesis, Cape Peninsula University of Technology, 2005. http://hdl.handle.net/20.500.11838/904.

Full text

Abstract:

Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, 2005<br>The prediction of head losses in a pipe system is very important because head losses affect the performance of fluid machinery such as pumps. In a pipe system, two kinds of losses are observed: major losses and minor losses. In Newtonian and non-Newtonian flow, major losses are those that are due to friction in straight pipes and minor losses are those that are due to pipe fittings such as contractions, expansions, bends and valves. Minor losses must be accurately predicted in a pipe system becaus

APA, Harvard, Vancouver, ISO, and other styles

17

Reynolds, Karen Jane. "Acoustic monitoring of prosthetic heart valves." Thesis, University of Leicester, 1994. http://hdl.handle.net/2381/34209.

Full text

Abstract:

The aim of the work presented in this thesis was to examine the possibility of detecting structural changes to an implanted prosthetic heart valve by spectral analysis of the sounds produced by the valve. On closure, mechanical heart valves produce a distinct sound as the occluder strikes the metal frame of the valve. Any change in the mechanical state of the valve will produce changes in the modes of vibration of the entire structure, causing the spectrum of the closing sounds to change. Initial recordings were made in a large tank of water providing ideal valve actuation and recording condit

APA, Harvard, Vancouver, ISO, and other styles

18

Sitte, André, Oliver Koch, Jianbin Liu, Ralf Tautenhahn, and Jürgen Weber. "Multidimensional flow mapping for proportional valves." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71093.

Full text

Abstract:

Inverse, multidimensional input-output flow mapping is very important for use of valves in precision motion control applications. Due to the highly nonlinear characteristic and uncertain model structure of the cartridge valves, it is hard to formulate the modelling of their flow mappings into simple parameter estimation problems. This contribution conducts a comprehensive analysis and validation of three- and four-dimensional input-output-mapping approaches for a proportional pilot operated seat valves. Therefore, a virtual and a physical test-rig setup are utilized for initial measurement, im

APA, Harvard, Vancouver, ISO, and other styles

19

Zhang, Yinxing. "Bioprosthetic heart valves : ultrastructure and calcification." Master's thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/26921.

Full text

Abstract:

Sumaary in English.<br>Includes bibliographical references.<br>Background: Due to the geographic distance between abattoirs and commercial valve plants delays between harvest and fixation usually range from 48 to 72 hours. In order to assess the pre-fixation tissue damage arising from the hypoxic period and the resulting calcific degeneration after implantation, we used an ultrastructural damage score and transmission electron microscopy. Materials and Methods: In a step by step manner, three major issues were clarified: 1) The degree of pre-fixation tissue damage was determined in the four mo

APA, Harvard, Vancouver, ISO, and other styles

20

Carroll, Turhan Kendall. "Radiation Damage in GMR Spin Valves." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1281633368.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Batley, Joseph Thomas. "Spin transport in lateral spin valves." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/12176/.

Full text

Abstract:

This thesis outlines the construction of an ultra-high-vacuum angle-deposition system, developed specifically for the fabrication of lateral spin valves (LSVs). The thesis then proceeds to answer two important questions: what causes the loss of spin accumulation at low temperatures seen in LSVs? and how do spin currents interact in multi-terminal circuits? Through a double-dose electron beam lithography and angle-deposition technique, Cu/Py LSVs are fabricated and shown to have transparent contacts. By means of a DC injection method, the nonlocal voltage is measured as a function of injection

APA, Harvard, Vancouver, ISO, and other styles

22

Pomeroy, Paul E. "Erosive wear failure of spool valves." Thesis, University of Bath, 1995. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261073.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Davis, R. Ted. "Aerating Butterfly Valves to Suppress Cavitation." DigitalCommons@USU, 1986. https://digitalcommons.usu.edu/etd/3952.

Full text

Abstract:

Proper aeration of cavitating hydraulic equipment can greatly reduce cavitation intensity, noise, and damage. This thesis quantifies the benefit, in terms of damage and noise, from aerating six inch butterfly valve. The incipient damage level of cavitation was obtained for both aerated and non -ae ra ted conditions. The level is defined as one pit per square inch of a soft aluminum test specimen per one minute of operation. A description of the cavitation pits that occurred plus where they appeared is presented. A graph showing the aerated and non-aerated limits of incipient damage is given al

APA, Harvard, Vancouver, ISO, and other styles

24

Muller, Matthew. "Modeling, design and control of forced-feedback metering poppet valve system." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4644.

Full text

Abstract:

Thesis (M.S.)--University of Missouri-Columbia, 2006.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 17, 2009) Includes bibliographical references.

APA, Harvard, Vancouver, ISO, and other styles

25

Simpson, Michael S. "An in vitro investigation of systolic anterior motion of the mitral valve." Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/33615.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Williams, Franklin Pierce. "The numerical simulation of flow through an axisymmetric aortic heart valve." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/9378.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Gieseking, Elizabeth Robinson. "Control mechanism for the papillary muscles of the mitral valve : an In Vitro study." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/10912.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Juthier, Francis. "Ingénierie tissulaire de valves cardiaques : apport des techniques de thérapie cellulaire." Phd thesis, Université du Droit et de la Santé - Lille II, 2009. http://tel.archives-ouvertes.fr/tel-00433512.

Full text

Abstract:

Les prothèses valvulaires cardiaques actuellement commercialisées présentent des inconvénients importants. Les prothèses biologiques (xéno ou allo greffes) sont soumises à une dégénérescence progressive, et les prothèses mécaniques nécessitent un traitement anticoagulant à vie. Des perspectives nouvelles sont apparues avec l'ingénierie tissulaire, dont le but est de créer à partir d'un support non cellularisé (matrice biodégradable de polymère de glycogène, ou xénogreffe décellularisée) un substitut valvulaire « vivant » offrant une meilleur longévité et des performances hémodynamiques optimal

APA, Harvard, Vancouver, ISO, and other styles

29

Damen, Bas Stefaan, and bsdamen@hotmail com. "Design, Development, and Optimisation of a Culture Vessel System for Tissue Engineering Applications." Swinburne University of Technology. n/a, 2003. http://adt.lib.swin.edu.au./public/adt-VSWT20040512.125051.

Full text

Abstract:

A Tissue Engineering (TE) approach to heart valve replacement has the aim of producing an implant that is identical to healthy tissue in morphology, function and immune recognition. The aim is to harvest tissue from a patient, establish cells in culture from this tissue and then use these cells to grow a new tissue in a desired shape for the implant. The scaffold material that supports the growth of cells into a desired shape may be composed of a biodegradable polymer that degrades over time, so that the final engineered implant is composed entirely of living tissue. The approach used at Sw

APA, Harvard, Vancouver, ISO, and other styles

30

Gallocher, Siobhain Lynn. "Durability Assessment of Polymer Trileaflet Heart Valves." FIU Digital Commons, 2007. http://digitalcommons.fiu.edu/etd/54.

Full text

Abstract:

The durability of a polymer trileaflet valve is dependent on leaflet stress concentrations, so valve designs that reduce stress can, hypothetically, increase durability. Design aspects that are believed to contribute to reduced leaflet stress include stent flexibility, parabolic coaptation curvature, and leaflet anisotropy. With this in mind, the purpose of this investigation was to elucidate what specific combinations of these parameters promote optimal acute and long-term valve function. A combination of four stent designs, seven leaflet reinforcement materials, and three coaptation geometri

APA, Harvard, Vancouver, ISO, and other styles

31

Weind, Kirsten L. "Potential oxygenation routes of aortic heart valves." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ58247.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Popinciuc, Mihăiţă. "Hybrid organic spin valves interfaces and transport /." [S.l. : Groningen : s.n. ; University Library Groningen] [Host], 2007. http://irs.ub.rug.nl/ppn/304590207.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Goodman, Andrew M. "Magnetisation reversal in exchange biased spin-valves." Thesis, Bangor University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322900.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Ellwein, Christian. "Vibration based fault detection for Solenoid valves." Thesis, Northumbria University, 2002. http://nrl.northumbria.ac.uk/236/.

Full text

Abstract:

Solenoid valves play a vital role in many machines and systems. If one of these devices breaks down the whole system can be affected. Because of this importance of valves, it is desirable to observe these parts to detect faults, both when they are occurring and before they can cause serious damage. Among several possible methods of observation (monitoring actuation time, electrical current, fluidic parameters and others) the observation of mechanical vibrations is a well known method of observing mechanical systems which is commonly used for observation of rotating machinery, but which include

APA, Harvard, Vancouver, ISO, and other styles

35

Bien, D. C. S. "Micromachined valves and pump for microfluidic applications." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269168.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Banerjee, Niladri. "Nonlinear giant magnetoresistance in dual spin valves." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610064.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Bergqvist, Per, and Linus Kemmler. "Voice Coil Controlled Inspiration and Expiration Valves." Thesis, KTH, Maskinkonstruktion (Inst.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156855.

Full text

Abstract:

This master thesis was performed at Maquet Critical Care located in Solna, Stockholm. Maquet Critical Care is a market leader in high performance medical ventilators. A ventilator is a medical device that helps patients to breathe. Two of the most vital components of a ventilator are the valves that are closest to the patient. These are the inspiration valve and the expiration valve. The main purpose with this thesis is to get, theoretical as well as practical insights into the inspiration and expiration valves to be developed. On top of this a ventilator using the developed valves was to be d

APA, Harvard, Vancouver, ISO, and other styles

38

Malakhatka, Elena. "Diagnostics of valves on the gas pipeline." Thesis, KTH, Kraft- och värmeteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-101377.

Full text

Abstract:

The work of the gas transmission pipeline system is regulated by the thousands of valveses and other elements of the shut-off valves, located in different places. Information about the current status of each valve, and confidence in its technical serviceability is an important element in the control of pipeline system. There are a number of problems that adversely affect the valving operation. Principal among them - is the lack of siystematical approach in valving diagnostics. To solve this problem, developed a new approach to the valving diagnostics – multi-level diagnostics. Depending on th

APA, Harvard, Vancouver, ISO, and other styles

39

Alaya, Oussama, and Maik Fiedler. "Optimal pressure control using switching solenoid valves." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200545.

Full text

Abstract:

This paper presents the mathematical modeling and the design of an optimal pressure tracking controller for an often used setup in pneumatic applications. Two pneumatic chambers are connected with a pneumatic tube. The pressure in the second chamber is to be controlled using two switching valves connected to the first chamber and based on the pressure measurement in the first chamber. The optimal control problem is formulated and solved using the MPC framework. The designed controller shows good tracking quality, while fulfilling hard constraints, like maintaining the pressure below a given up

APA, Harvard, Vancouver, ISO, and other styles

40

Yap, Cheng-Hon. "Factors influencing cryopreserved allograft heart valve degeneration." Connect to thesis, 2006. http://repository.unimelb.edu.au/10187/2120.

Full text

Abstract:

Heart valve replacement is becoming more commonplace in developed nations. Despite this the ideal valve prosthesis has not been found. The allograft valve has been used for over 40 years and remains an important prosthesis with many advantages. However, like other biological valve prosthesis, they have a finite durability. The causes of allograft valve degeneration are still unknown. The study aims to identify factors associated with cryopreserved allograft valve degeneration. Knowledge of such factors will improve our understanding of the potential causes and mechanisms of allograft heart val

APA, Harvard, Vancouver, ISO, and other styles

41

Perez, Thierry. "Traitement fibrinolytique des thromboses de valves cardiaques mécaniques chez l'enfant." Bordeaux 2, 1998. http://www.theses.fr/1998BOR23092.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Nakatsu, Taro. "Intermediate-term outcomes of aortic valve replacement with bioprosthetic or mechanical valves in patients on hemodialysis." Kyoto University, 2020. http://hdl.handle.net/2433/252979.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Peacock, Jacqueline D. "The Role of Sox9 in Heart Valve Development and Disease." Scholarly Repository, 2011. http://scholarlyrepository.miami.edu/oa_dissertations/543.

Full text

Abstract:

Heart valve structures open and close during the cardiac cycle to provide unidirectional blood flow through the heart, critical for efficient cardiovascular function. Valve dysfunction results in either incomplete opening or incomplete closure of the valve. Both types of valve dysfunction decrease efficiency of blood flow, increasing the load on the myocardium and leading to secondary heart disease such as pathological hypertrophy and heart failure. There are currently no effective treatments to prevent or slow the progression of valve disease, and there are no pharmacological treatments for a

APA, Harvard, Vancouver, ISO, and other styles

44

Pope, Larry G. "Effect of Engineered Surfaces on Valve Performance." Thesis, University of North Texas, 2000. https://digital.library.unt.edu/ark:/67531/metadc2670/.

Full text

Abstract:

Performance of air operated valves is a major maintenance concern in process industries. Anecdotal information indicates that reliability of some high maintenance valves has been improved by using an ion deposition process to achieve engineered surfaces on selected components. This project compared friction for various surface treatments of selected valve components. Results indicate valve performance may be slightly more consistent when an engineered surface is applied in the valve packing area; however surface treatment in this area does not appear to have a dominant affect on reducing valve

APA, Harvard, Vancouver, ISO, and other styles

45

Simon, Hélène A. "Influence of the implant location on the hinge and leakage flow fields through bileaflet mechanical heart valves." Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04012004-192539/unrestricted/helene%5Fsimon%5Fa%5F200405%5Fmast.pdf.

Full text

Abstract:

Thesis (M.S.)--Chemical Engineering, Georgia Institute of Technology, 2003.<br>Sambanis Athanassios, Committee Member ; Sotiropoulos Fotis, Committee Member ; Yoganathan Ajit, Committee Chair. Includes bibliographical references (leaves 239-243).

APA, Harvard, Vancouver, ISO, and other styles

46

Luo, Yamin. "System modeling and control design of a two-stage metering poppet-valve system." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4453.

Full text

Abstract:

Thesis (Ph. D.)--University of Missouri-Columbia, 2006.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on July 18, 2008) Vita. Includes bibliographical references.

APA, Harvard, Vancouver, ISO, and other styles

47

Zappe, Ann-Katrin Reglinde [Verfasser]. "Follow-Up bei Patienten nach perkutaner Valve-in-Valve Aortenklappenimplantation : Patients with transcatheter valve-in-valve implantation for failed surgical aortic valves / Ann-Katrin Reglinde Zappe." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2020. http://d-nb.info/1223928322/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Leung, Wing-ki Vikki, and 梁頴琪. "The implications of transcatheter aortic valve implantation (TAVI) adoption." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48424031.

Full text

Abstract:

Aortic stenosis is a life-threatening valvular heart disease. At the onset of symptoms, a patient’s prognosis becomes poor and the risk of death rapidly increases. Aortic valve replacement surgery remains the gold standard in treatment for aortic stenosis. However, in the total population of patients with severe aortic stenosis, about one third are deemed inoperable due to their high surgical risk. In recent years, the development of transcatheter aortic valve implantation (TAVI), a non-invasive heart valve replacement procedure brought hope for the elderly, high-risk and inoperable aortic st

APA, Harvard, Vancouver, ISO, and other styles

49

Southern, Lisa Jane. "Identification of glutaraldehyde induced structures in bioprosthetic heart valves using mass spectrometry : an insight into valve failure." Thesis, University of Sheffield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366113.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Kontz, Matthew Edward. "Haptic Control of Hydraulic Machinery Using Proportional Valves." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19876.

Full text

Abstract:

Supplying haptic or force feedback to operators using hydraulic machinery such as excavators has the potential to increase operator capabilities. Haptic, robotic, human-machine interfaces enable several enhancing features including coordinated motion control and programmable haptic feedback. Coordinated or resolved motion control supplies a more intuitive means of specifying the equipment's motion. Haptic feedback is used to relay meaningful information back to the user in the form of force signals about digging force acting on the bucket, programmable virtual constraints and system limitat

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!