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Tesis sobre el tema "Heat control"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 11 de febrero de 2022

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1

Lundh, Magnus. "Optimization and tuning of heat control." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-97936.

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Heat pumps have become even more popular when it’s about getting hot water and heat in our departments and villas. Before the heat pumps can be put into operation they have to go through some tests. IVT Industries AB performs the tests in different test rigs depending on the size or effect of the pump. The rig is divided in villapumps and real estate facilitypumps. Testrig F2 is one of the rigs where tests are performed on heatpumps in real estate facility’s. Doing adjustments of hot and cold water today, the IVT company uses cascades PIDcontrollers where the parameters has to be adjust on eac

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2

Nordlöf, Anon, and John Lundqvist. "Turbo Heat Transfer Modeling for Control." Thesis, Linköpings universitet, Fordonssystem, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-150352.

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The demand for lower emission engines forces the car industry to build moreefficient engines. Turbocharged engines are on the rise, and better understandingof the heat transfer and efficiency of the turbocharger is needed to build better ones. A lot is known about the overall efficiency of the turbocharger, but not much is known about where the heat losses are located and how they interact with each other. This thesis presents a one dimensional model for heat exchange in the tur-bocharger and investigates how the heat flows from the hot exhaust gases to the cold intake air. Data is gathered by

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3

Storm, Josefin. "Heat Transfer Modeling for Turbocharger Control." Thesis, Linköpings universitet, Fordonssystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-141949.

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Turbocharging is a way to stay competitive on the market where there are increasing demands on fuel consumption and engine performance. Turbocharging lets the engine work closer to its maximum power and thereby reduces the relative losses due to pumping and friction. The turbocharger is exposed to big temperaturedifferences and heat flows will occur both internally between the turbine and the compressor as well as between the turbocharger and its surroundings. Away to get a better understanding of the behaviour of the turbocharger is to understand the heat flows better. This thesis is therefor

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4

Akkam, Mazen. "Microcomputer based heat controller." Thesis, Kansas State University, 1985. http://hdl.handle.net/2097/9816.

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5

Mulford, Rydge Blue. "Dynamic Radiation Heat Transfer Control Through Geometric Manipulation." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8134.

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The surface area and radiative properties of an object influence the rate of radiative emission from the object's surface and the rate of radiative absorption into the surface. Control of these variables would allow for the radiative heat transfer behavior of the surface to be manipulated in real time. Origami tessellations, being a repeated pattern of linked, dynamic surfaces, provide a framework by which dynamic control of apparent radiative properties and surface area is possible. The panels within a tessellation form cavities whose aspect ratio varies as the device actuates. The cavity eff

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6

Vizcaino-Garcia, Fidel. "Control strategies for flexible heat exchanger networks." Thesis, University of Manchester, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503089.

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7

Sedaghat, Ahmadreza. "Cement Heat of Hydration and Thermal Control." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6142.

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Heat of hydration is a property of Portland cement and a direct result of the chemical reaction between cement and water. The amount of heat released is dependent upon the cement mineralogical composition, curing temperature, water to cement ratio, and cement fineness. High temperature resulting from heat of hydration (thereon referred to as HOH) of cement can affect the hydration process, and consequently the kinetics of development of the mechanical properties of concrete. One of the main reasons triggering the interest in HOH of cement is its implication in thermal cracking of concrete. The

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8

Lartz, Douglas John. "Feedforward temperature control using a heat flux microsensor." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06302009-040309/.

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9

Sundbrandt, Markus. "Control of a Ground Source Heat Pump using Hybrid Model Predictive Control." Thesis, Linköpings universitet, Reglerteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-71369.

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The thesis has been conducted at Bosch Thermoteknik AB and its aim is to develop a Model Predictive Control (MPC) controller for a ground source heat pump which minimizes the power consumption while being able to keep the inside air temperature and Domestic Hot Water (DHW) temperature within certain comfortintervals. First a model of the system is derived, since the system consists of both continuous and binary states a hybrid model is used. The MPC controller utilizes the model to predict the future states of the system, and by formulating an optimizationproblem an optimal control is achieved

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10

Salam, Md Abdul, and Md Mafizul Islam. "Modelling and Control System Design to control Water temperature in Heat Pump." Thesis, Karlstads universitet, Avdelningen för fysik och elektroteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-30680.

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The thesis has been conducted at Hetvägg AB and the aim is to develop a combined PID and Model Predictive Controller (MPC) controller for an air to water heat pump system that supplies domestic hot water (DHW) to the users. The current control system is PLC based but because of its big size and expensive maintenance it must be replaced with a robust controller for the heat pump. The main goal of this project has been to find a suitable improvement strategy. By constructing a model of the system, the control system has been evaluated. First a model of the system is derived using system identifi

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11

Christodoulou, Stephen. "Control of a heat-shock gene in yeast." Thesis, University of Kent, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385183.

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12

Arding, Karin, and de Betou Siri In. "Making grid capacity available through heat pump control." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-384182.

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In this report the problem of constructing a bus depot with electrical buses despite the lack of grid capacity, was analyzed. A potential solution is investigated, namely smart control of heat pumps in industries. The possibility of allocating grid capacity to the bus depot by reducing power consumption in heat pumps during peak hours, is taken into consideration. The maximum amount of released capacity in an industrial area is calculated through the controlling of heat pumps. This investigation was made through simulations with a simplified building energy model (lumped capacity model) which

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13

Johansson, Max. "Optimal Control of Heat Transfer Rates in Turbochargers." Thesis, Linköpings universitet, Fordonssystem, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-148734.

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The turbocharger is an important component of competitive environmentally friendly vehicles. Mathematical models are needed for controlling turbochargers in modern vehicles. The models are parameterized using data, gathered from turbocharger testing ingas stands (a flow bench for turbocharger, where the engine is replaced with a combustion chamber, so that the exhaust gases going to the turbocharger can be controlled with high accuracy). Collecting the necessary time averaged data is a time-consuming process. It can take more than 24 hours per turbocharger. To achieve a sufficient level of acc

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14

Michaela, Hillerström, and Ludvig Wingårdh. "Solar Radiation Prediction for Heat Pump System Control." Thesis, KTH, Energiteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-233171.

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Detta kandidatexamensarbete fokuserar på indirekt mätning av solstrålning där en förbättring av en värmepump i ett bostadshus var huvudfokus. Detta utan att använda redan existerande utrsutning för mätning av solstrålning - pyranometrar- då denna utrustning är relativt dyr. För att genomföra detta projekt har en litteraturstudie gjorts där artiklar om indirekt mätning eller förutsägelse av solstrålning har studerats. Både konventionella metoder och nyare metoder som använder sig utav maskininlärning har varit en del av litteraturstudien. En redan befintlig metod för att förutse strålningseffek

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15

Chowdhury, Jahedul Islam. "Modelling and control of waste heat recovery system." Thesis, Queen's University Belfast, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725593.

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This research focuses on the waste heat recovery (WHR) from low and medium grade heat sources, and its conversion into mechanical rotations and electrical energy using organic Rankine cycle (ORC), in automotive and industrial applications. The research outcomes include: (1) development of subcomponent models including a novel fuzzy based evaporator model of the supercritical ORC-WHR system using thermodynamic and numerical methods in MATLAB/Simulink, (2) overall ORC-WHR integration and complete system simulation to improve thermal and heat recovery efficiency in steady state and dynamic condit

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16

End, Thomas [Verfasser]. "Optimal Control of Nonlocal Radiative Heat Transfer / Thomas End." München : Verlag Dr. Hut, 2012. http://d-nb.info/1021072893/34.

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17

Hepworth, Simon. "Hybrid neural control of heat exchangers in HVAC plant." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260138.

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18

Johnson, Tim. "Heat treatments to control fungal skin diseases of potato." Thesis, University of Essex, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.435255.

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19

Yousefi, Darani Shahrokh. "Control and Automation of a Heat Shrink Tubing Process." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699928/.

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Heat shrink tubing is used to insulate wire conductors, protect wires, and to create cable entry seals in wire harnessing industries. Performing this sensitive process manually is time consuming, the results are strongly dependent on the operator’s expertise, and the process presents safety concerns. Alternatively, automating the process minimizes the operators’ direct interaction, decreases the production cost over the long term, and improves quantitative and qualitative production indicators dramatically. This thesis introduces the automation of a heat shrink tubing prototype machine that be

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20

Meyer, Antoine. "Active control of heat transfer by an electric field." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMLH13/document.

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La stabilité d’un fluide Newtonien diélectrique confiné dans un anneau cylindrique et soumis à un gradient radial de température et à un champ électrique est étudiée. Le gradient de température induit une stratification de la permittivité électrique du fluide et de sa masse volumique. Trois poussées thermiques rentrent alors en jeu : la gravité terrestre créée la poussée d’Archimède, la rotation des cylindres engendre la poussée centrifuge, et le champ électrique induit la poussée diélectrophorétique. L’effet de ces poussées est étudié dans différentes combinaisons, principalement à travers l’

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21

Verrax, Paul. "Model Predictive Control Applied to Ground Source Heat Pumps." Thesis, KTH, Reglerteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-224330.

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Building heating is one of the most important sources of energy consumption. GroundSource Heat Pumps (GSHP) are efficient heating systems, particularly popular in the Nordiccountries. However, the GSHPs available for the consumer market today typically only utilizebasic control schemes that are relatively inflexible. More advanced strategies such as ModelPredictive Control (MPC) appear as a promising approach to improve comfort while reducingconsumption. The present thesis considers a typical user case of a single family house heatedby a ground source heat pump willing to reduce its environmen

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22

Boonsrang, Direcksataporn. "A study on the dynamic characteristics and control of heat exchangers in waste heat recovery systems /." Electronic version of summary, 1992. http://www.wul.waseda.ac.jp/gakui/gaiyo/1797.pdf.

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23

Govindaraj, Thavamani. "Optimal Control of a Stochastic Heat Equation with Control and Noise on the Boundary." Thesis, Linnéuniversitetet, Institutionen för matematik (MA), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-76037.

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In this thesis, we give a mathematical background of solving a linear quadratic control problem for the heat equation, which involves noise on the boundary, in a concise way. We use the semigroup approach for the solvability of the problem. To obtain optimal controls, we use optimization techniques for convex functionals. Finally we give a feedback form for the optimal control. In order to enhance understanding of linear quadratic problem, we first present the methods in deterministic cases and then extend to noisy systems.

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24

Bakhurji, Khalid A. "Cascade control for a steam-heated double-pipe heat exchanger." Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1596967.

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<p> The goal of this thesis is to create the experimental setup and the necessary instrumentation for the temperature control of a double-pipe heat exchanger. The heat exchanger, located at the Chemical Engineering Control Laboratory at the California State University, Long Beach, has been used in the past for temperature control experiments, in which the manipulated variable was the incoming water flow. In the control experiments performed for the current work, the manipulated variable is the incoming steam pressure. For this purpose cascade control has been used, with an inner loop contro

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25

Mengod, Bautista Fernando. "Propane Heat Pump Modelling and Monitoring for System Control Analysis." Thesis, KTH, Tillämpad termodynamik och kylteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-250669.

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The objective of this master thesis was the performance analysis of a non-conventional heating system layout based on a propane heat pump unit. The objective had been pursued by monitoring and modelling the system. First, the project focused on monitoring the system, since for a correct modelling it was necessary to have all the data of the system. For this, the first step was to identify the necessary variables for the complete analysis, being temperatures and pressures as necessary as data for the calculation of power, flows and energetic analyses. The system, located in Åkersberga (Sweden),

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26

Calandranis, John Christos. "Operability studies in heat exchanger networks : analysis, control and synthesis." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14393.

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27

Melani, Barreiro Diego A. "A small satellite preliminary thermal control and heat shield analysis." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/43020.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2008.<br>Includes bibliographical references (leaf 23).<br>As part of a student owned small satellite project, a preliminary thermal control and heat shield analysis was developed to verify acceptable performance requirements for the system. For the thermal control section, the analysis was focused on the Bus module of the satellite. It measured the effects of the Sun and Eclipse periods at low earth orbit (LEO), accounted key design and subsystems interaction considerations and indicated some of th

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28

Horrell, Judith Ann. "Translational control of the heat shock response in Xenopus oocytes." Thesis, University of Warwick, 1988. http://wrap.warwick.ac.uk/99025/.

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It has been suggested that the heat shock response of Xenopus oocytes might provide a good model system to study the regulation of translation in early development: oocytes were thought to contain a store of hsp70 mRNA, which was unmasked reversibly on heat shock. However, more recently it has been reported that the hsp70 apparently synthesized in oocytes is in fact made entirely in the attached follicle cells. A method was developed to reliably remove follicle cells. Two-dimensional gel analysis of radioactively labelled oocytes revealed that, although hsp70 was the major protein synthesized

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29

Byström-Troyan, Filipp. "Heat and fluid control solutions for deep space CubeSat CGPS." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-303116.

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This thesis is on the subject of how propellant heating considerations affect the design of a CubeSat cold gas propulsion system. Computer simulation tools are used to analyse heat flow through the system, as well as the fluid flow and phase change of butane. The heating performance is presented for different operational states and different designs. Finally, an optimal system design is suggested. The propulsion system in question is the deep space heading Hera Juventas 6DOF CGPS. The Juventas spacecraft will as part of ESA’s Hera mission be the first to perform radar measurements of an astero

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30

Ščepka, Ondrej. "Měřící a řídicí systém pro tepelné čerpadlo." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-400600.

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This master thesis describes the issue of the measuring and control system for the heat pump. In the first part of the thesis is described the principle of heat pump activity, its basic components. The second part contains the distribution of heat pumps according to the method of obtaining and transferring the heat. The following chapter contains the description of system status before the modernization. In the practical part of this thesis is the proposal and realization of new control and monitoring system including the description of individual components. In the conclusion of the thesis is

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31

Vayena, Olga. "Distributed parameter control in rapid thermal processing (RTP) /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2004.

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Thesis (Ph.D.)--Tufts University, 2004.<br>Adviser: Haris Doumanidis. Submitted to the Dept. of Mechanical Engineering. Includes bibliographical references (leaves 123-129). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

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32

Denker, Richard. "Dimensioning and control for heat pump systems using a combination of vertical and horizontal ground-coupled heat exchangers." Thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-36475.

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A model has been developed which simulates a system consisting of a horizontal and vertical ground-coupled heat exchanger connected in parallel to the same heat pump. The model was used in computer simulations to investigate how the annual minimum and mean fluid temperatures at the heat pump varied as several parameters of the combined system were changed. A comparison was also made between different control settings for fluid flow rate distribution between the two exchangers. For the case when the flow rate distribution was not controlled, the effect of viscosity differences between a colder

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33

El, Sachat Alexandros. "Characterization of nanostructured materials for thermal conduction and heat transfer control." Doctoral thesis, Universitat Autònoma de Barcelona, 2017. http://hdl.handle.net/10803/405520.

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L'objectiu principal d'aquesta tesi és l'estudi de les propietats tèrmiques de materials nanoestructurats com un mitjà per controlar el transport de calor. Per a aquest propòsit s’han portat a terme mesures tèrmiques amb diferents tècniques experimentals a escales que cobreixen desenes de micròmetres fins a per sota de 50 nanòmetres. En aquest tesi s’estudien i es presenten dues tècniques experimentals en particular: (a) la microscòpia tèrmica d’escombrat (SThM) i (b) la termometria Raman amb dos làsers (2LRT). Aquestes tècniques s'han aplicat àmpliament per mesurar amb èxit propietats tèrmi

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34

DeRocher, Amy Elizabeth. "Developmental control of heat shock protein expression during pea seed maturation." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186151.

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Heat shock proteins (HSPs) are strongly conserved families of proteins induced when an organism is exposed to elevated temperatures. I have studied the expression of two of these protein families, small (s) HSPs and HSP70s in pea (Pisum sativum). Both protein families are induced during seed maturation in addition to being expressed in response to elevated temperatures. Class I cytoplasmic sHSP mRNAs are strongly induced in response to heat stress, comprising over 1% of the mRNA population. HSPs are strongly induced by environmental conditions mimicking conditions plants would experience on ho

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35

Kim, Minsoo. "Protein Quality Control, Redox Balance and Heat Stress Tolerance in Arabidopsis." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/217060.

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The Arabidopsis HSP101 protein belongs to the Hsp100/ClpB family of AAA+ proteins (ATPases Associated with various cellular Activities). This family of proteins, in collaboration with the Hsp70 chaperone system, has the remarkable ability to solubilize protein aggregates and refold proteins back to their native forms. Thus, their chaperone activity is necessary for acquired thermotolerance in organisms as diverse as bacteria and plants. My dissertation project focused on understanding the mechanism of HSP101 action using Arabidopsis thaliana as a model system. The first approach used genetics

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36

Chant, Eileen Elizabeth. "Transient and steady state simulations of an advanced desiccant enhanced cooling cycle." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/17846.

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37

Hanses, Jonathan, and Morten Eriksson. "Modelling and Control of Heat Distribution in a Powder Bed Fusion 3D Printer." Thesis, Linköpings universitet, Reglerteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-159792.

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This thesis report describes how to improve the control of the temperature in a Powder Bed Fusion 3D printer. This is accomplished by first creating a model ofthe thermal system. To create a good model, both black-box and grey-box models of the system are estimated and compared. Based on the best model, different control designs are examined and the results are compared to find the control design yielding the best results. The system being modelled is a multiple input multiple output system with acomplex internal structure. The modelling can be divided into several steps. Firstly, data has to

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38

Youssef, Walid Mohamed Khalil Abdalla. "Experimental and computational study of indirect expansion solar assisted heat pump system with latent heat storage for domestic hot water production." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/15263.

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Solar assisted heat pump (SAHP) systems have been widely applied in domestic hot water (DHW) production due to their sustainability and stability in operations. However, their performance efficiency requires further improvement using advanced technologies such as energy storage with phase change materials (PCM) and optimal system controls. Undoubtedly, employing PCMs for latent heat storage (LHS) application has a great potential to improve a solar thermal application performance. Despite this fact, the use of PCM in this area is quite limited due to the poor thermal conductivity of available

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39

Farson, Dave F. "Control of arc weld thermal cycles." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1387446228.

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40

Delatore, Fabio. "Controle multivariável em redes de trocadores de calor com bypasses." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-13072011-145446/.

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Atualmente, existe uma grande variedade de metodologias de controle que poderiam ser utilizadas e aplicadas a processos industriais. Algumas destas metodologias têm um projeto complexo, exigindo um estudo extra de engenharia para projetar um controlador com um desempenho excelente. Outros controladores não apresentam um desempenho tão bom, embora apresentem um projeto extremamente simples. Entre a mais simples e a mais complexa metodologia, existem soluções de controle intermediárias, baseadas nas teorias de controle ótimo, que apresentam uma relativa simplicidade de projeto combinada com um d

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41

Almajali, Mohammad Rajab. "ENGINEERED CARBON FOAM FOR TEMPERATURE CONTROL APPLICATIONS." University of Dayton / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1271365522.

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42

Fillius, James B. "An experimental study of steady state high heat flux removal using spray cooling." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Dec%5FFillius.pdf.

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43

Eriksson, Mikael, and Oskar Graffman. "Modelling and Simulation of Heat Pump Systems for Hybrid and Electrical Vehicles." Thesis, Linköpings universitet, Fordonssystem, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-149993.

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Hybridization and electrification of modern vehicles is today a reality. This effects the construction of the heating and cooling systems in vehicles where earlier the waste heat from the combustion engine was a great heat source. Heat pump systems are commonly used in heating systems in buildings and can therefore also be used for heating the cabin and different components in a vehicle. Modelling a heat pump system and performing simulations gives the advantage of investigating the heating performance of the heat pump during certain conditions. In this master thesis, which is performed in a p

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44

Oliver, Danielle Simonette. "Power Requirements of Control Surface Actuators Towards Active Aeroelastic Control Using the Method of Receptances." Miami University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami159601703575348.

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45

Ummethala, Upendra V. "Control of heat conduction in manufacturing processes : a distributed parameter systems approach." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/44894.

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46

Park, Sunho 1976. "Control of oligonucleotide conformation on nanoparticle surfaces for nanoscale heat transfer study." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/27120.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.<br>Includes bibliographical references (leaves 77-82).<br>Metal nanoparticles can be used as antennae covalently linked to biomolecules. External alternating magnetic field can turn on and off the biological activity of the molecules due to induction heating from the particles that changes the temperature around the molecules. Here an experimental scheme towards direct temperature probing is proposed to predict the behavior of the antenna. Oligonucleotides modified with photosensitive molecules are con

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Yebiyo, Metkel. "Optimisation of inter-seasonal ground source heat pumps with predictive behavioural control." Thesis, London South Bank University, 2016. http://researchopen.lsbu.ac.uk/1818/.

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In practice, heat pumps (HP) often do not perform as expected. This is due to many factors such as how well the system and the ground loop are designed, installed and subsequently maintained and how well they are operated and controlled in the field. Improving overall system design and demonstrating increased HP performance and higher reliability are core objectives for this research. Performance instability and variations in ground source heat pump (GSHP) system output has been observed previously and this indicates that detailed research is required for example (i) to identify the relationsh

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48

Surendran, Aswathy. "Passive control of thermoacoustic instabilities in idealised combustion systems using heat exchangers." Thesis, Keele University, 2017. http://eprints.keele.ac.uk/4184/.

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Thermoacoustic instabilities pose a great threat to combustion systems, as they could cause severe structural damage, if they are unchecked and uncontrolled. These instabilities are caused due to the existence of a positive feedback loop between the pressure oscillations and heat release rate oscillations. To prevent these instabilities, one can adopt active or passive control strategies. The aim of the present work is to passively control thermoacoustic instabilities in a domestic boiler system. To this end, the boiler is modelled as a 1D quarter-wave resonator (open at one end and closed at

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49

Gagnon, Daniel. "Postexercise hemodynamics and control of heat loss responses following exercise-induced hyperthermia." Thesis, University of Ottawa (Canada), 2007. http://hdl.handle.net/10393/27845.

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Purpose. The purpose of this thesis was to investigate the nonthermoregulatory control of cutaneous vascular conductance (CVC) and sweating during recovery from exercise-induced hyperthermia as well as to determine possible sex-related differences during the recovery period. It was hypothesized that an active and passive recovery would maintain mean arterial pressure (MAP), CVC and sweat rate at higher levels than an inactive recovery and result in a faster rate of esophageal temperature (Tes) decay. It was also hypothesized that changes in MAP, CVC and sweat rate would be sex dependent. Metho

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50

Park, Sammy Ace. "Combustion instability and active control| Alternative fuels, augmentors, and modeling heat release." Thesis, University of Maryland, College Park, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10129882.

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<p> Experimental and analytical studies were conducted to explore thermo-acoustic coupling during the onset of combustion instability in various air-breathing combustor configurations. These include a laboratory-scale 200-kW dump combustor and a 100-kW augmentor featuring a v-gutter flame holder. They were used to simulate main combustion chambers and afterburners in aero engines, respectively. The three primary themes of this work includes: 1) modeling heat release fluctuations for stability analysis, 2) conducting active combustion control with alternative fuels, and 3) demonstrating practic

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