Searched for: subject%3A%22valve%22
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Manchester, Emily Louise (author), Pirola, S. (author), Pirola, Sergio (author), Mastroiacovo, Giorgio (author), Polvani, Gianluca (author), Pontone, Gianluca (author), Xu, Xiao Yun (author)
Aortic valve disease is often treated with bioprosthetic valves. An alternative treatment is aortic valve neocuspidization which is a relatively new reparative procedure whereby the three aortic cusps are replaced with patient pericardium or bovine tissues. Recent research indicates that aortic blood flow is disturbed, and turbulence effects...
journal article 2024
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Zheng, Zixuan (author), Zheng, Feifei (author), Qi, Zhexian (author), Wen, Jinhua (author), Chen, Junyi (author), Duan, Huan Feng (author), Savic, Dragan (author), Kapelan, Z. (author)
Isolation valve closures (IVCs) can effectively assist pipe maintenance and management in water distribution systems (WDSs), but they inevitably cause secondary impacts on the WDS’s performance. Previous studies have mainly focused on how to optimally operate or locate valves, but few efforts have been made on investigating the secondary impacts...
journal article 2024
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van Tunen, Rick (author)
Congenital heart disease (CHD) affects almost 1% of newborns. Right ventricular outflow tract (RVOT) CHD affects 20% of newborns and includes anomalies such as tetralogy of Fallot (TOF) with or without pulmonary atresia, transposition of the great vessels, and truncus arteriosus. All these anomalies require RVOT reconstruction. Prosthetic heart...
master thesis 2023
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Koopman, Laura (author)
<b>Introduction </b>Aortic valve regurgitation (AR) is a common type of aortic valve disease that affects the surrounding tissues of the heart. Surgery may be required in patients with acute or chronic AR, aortic root disease or ascending aortic dissection. A viable alternative to traditional aortic valve replacement that offers encouraging...
master thesis 2023
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van Dijk, Chris (author)
The Molten Salt Fast Reactor (MSFR) is a next generation nuclear reactor. The MSFR may play an important role in combatting global warming whilst ensuring energy safety considering fossil fuels’ finiteness. A key safety mechanism for the MSFR is the freeze plug, a valve underneath the reactor core designed to melt during reactor malfunction,...
master thesis 2023
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Guurink, Koen (author)
Building a distributed fluidic actuation system is a challenge due to every actuator needs its own control valve. Due to this, an n by an array of actuators needs n 2 number of valves. A logic network of valves provides a solution by reducing the number of valves needed to operate such distributed fluidic actuation system. These compliant...
master thesis 2023
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Pater, M. (author), Kaaks, B.J. (author), Lauritzen, Bent (author), Lathouwers, D. (author)
The design of a molten salt reactor is largely based on CFD simulations. Phase change plays an important role in the safety of the reactor, but numerical modelling of phase change is particularly challenging. Therefore, the knowledge of the margin of error of CFD simulations involving phase change is very important. Relevant experimental...
journal article 2023
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van der Windt, Bob (author)
Fluid-controlled actuators are widely used in lower limb prostheses. Most fluid-controlled actuators have valves integrated into the cylinder systems and require complex manufacturing steps, making these systems expensive. A cost-effective production method for these complex actuator valve systems is 3D-printing. The goal of this research is to...
master thesis 2022
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Fluttert, Bob (author)
The Intergovernmental Panel on Climate Change (IPCC) believes that multiple solutions must be deployed simultaneously to reduce the emission of greenhouse gases into the atmosphere. Carbon, Capture &amp; Storage (CCS) is an unavoidable technique within this portfolio as an intermediate solution. CCS requires transport of CO<sub>2</sub> through...
master thesis 2022
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Brenninkmeyer, Talitha (author)
“<i>A ruptured AAA [Abdominal Aortic Aneurysm] is the 15th leading cause of death in the country, and the 10th leading cause of death in men older than 55</i>” in the United States, states Singh (n.d.), in the Society for Vascular Surgeons. Such Abdominal Aortic Aneurysms (AAA, see Figure 2.2) are increasingly treated by...
master thesis 2021
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Shriya Rangaswamy, Shriya (author)
The lack of reliable disease models hampers the development of safe and effective drugs for humansas they fail to precisely identify the cardiotoxicity profile of drug compounds. Recent technological advancements have led to the development of the"Organ-On-Chip"(OOC) technology. OOCs are miniaturized micro-engineered devices which aim to...
master thesis 2021
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Xu, Fei (author), Kenjeres, S. (author)
We present a new numerical simulation framework for prediction of flow patterns in the human left ventricle model. In this study, a radial basis function (RBF) mesh morphing method is developed and applied within the finite-volume computational fluid dynamics (CFD) approach. The numerical simulations are designed to closely mimic details of...
journal article 2021
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Helsdingen, Martijn (author)
Vertical sliding valves that are part of a filling and emptying system of a lock are often subjected to an underflow of water during emptying and filling. The flow induces time varying forces on the structure which leads to dynamic behaviour of the valve. Whether the structure is in the range of resonance and what the amplitude of the vibrations...
student report 2020
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Hoogendoorn, Matthijs (author)
This thesis describes the development of a new electronic mixing valve for<br/>Quooker B.V., manufacturer of instant boiling water dispensing systems. A<br/>mixing valve is able to control the blending of different liquids to ensure a<br/>predetermined outcome. By integrating electronics into a mixing valve and<br/>turning it into a mechanic...
master thesis 2020
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Vandepoel, Florian (author)
Currently, mitral valve regurgitation (MR) is one of the leading heart valve diseases with as much as 19% of men and women having at least mild MR and 1.9 % having at least moderate MR Singh et al. (1999). DEMCON Medical Systems is working on a novel TC method to repair Mitral valve regurgitation in early stages as a preventive measure against...
master thesis 2020
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Ruijs, Ewout (author)
The increased implementation of digitalisation all over the world has led to an exponential growth of available data across various industries. Consequently, there is a large growth of Machine Learning (ML) techniques being applied to process data. Predictive maintenance is a digital strategy using condition-based monitoring techniques to track...
master thesis 2020
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Strebus, Tom (author)
This thesis is centred around the problem that heart failures become more common when other dis-eases could be treated better. Although surgery could fix the immediate effects of heart failures, therecovery after the surgery is hindered by the heart not being able to pump enough blood. There aresolutions available but they are not implemented...
master thesis 2020
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Huang, Yuan (author), Zheng, Feifei (author), Kapelan, Z. (author), Savić, Dragan (author), Duan, Huan-Feng (author)
This paper proposes a multistage method for burst leak localization through valve operations (VOs) and smart demand metering in district meter areas (DMAs) of water distribution systems (WDSs). Each stage includes partitioning of the DMA into two subregions using VOs and identification of potentially leaking pipes within the subregions...
journal article 2020
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Al-Washali, T.M.Y. (author), Mahardani, Meidy (author), Sharma, Saroj (author), Arregui, Francisco (author), Kennedy, M.D. (author)
Intermittent supply is common worldwide. It triggers households with piped connection to adjust the supply scheme by the use of a water tank with a float valve (FV) at the entrance, which has a major influence on the water meter accuracy. This study investigated the impact of the water tank with a FV on the performance of water meters under...
journal article 2020
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Pecci, Filippo (author), Abraham, E. (author), Stoianov, Ivan (author)
The optimal placement and operation of pressure control valves in water distribution networks is a challenging engineering problem. When formulated in a mathematical optimization framework, this problem results in a nonconvex mixed integer nonlinear program (MINLP), which has combinatorial computational complexity. As a result, the considered...
journal article 2019
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