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Dissertations / Theses on the topic 'Heat concentrating'

Author: Grafiati

Published: 3 June 2025

Last updated: 1 August 2025

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1

Veslum, Trygve Stansberg. "Absorber for concentrating solar heat collectors." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-14202.

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Open volumetric absorbers have been tested and evaluated with the objective to determine their ability to heat air for small scale concentrating solar systems, more exactly a solar oven where a stove is heated up by a rock bed storage provided with air above 220°C. The absorbers were tested in terms of different size, shape and material. Heating up air to the target temperature has been a challenge for years, but was achieved with good margin with an experimental setup based on the flaws of previous test setups. At a concentration factor of 300 and a parabolic dish aperture area of 1.07 m

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2

Hess, Stefan. "Low-concentrating, stationary solar thermal collectors for process heat generation." Thesis, De Montfort University, 2014. http://hdl.handle.net/2086/10874.

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The annual gain of stationary solar thermal collectors can be increased by non-focusing reflectors. Such concentrators make use of diffuse irradiance. A collector’s incidence angle modifier for diffuse (diffuse-IAM) accounts for this utilization. The diffuse irra-diance varies over the collector hemisphere, which dynamically influences the diffuse-IAM. This is not considered by state-of-the-art collector models. They simply calculate with one constant IAM value for isotropic diffuse irradiance from sky and ground. This work is based on the development of a stationary, double-covered process he

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3

Micheli, Leonardo. "Enhancing electrical and heat transfer performance of high-concentrating photovoltaic receivers." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/18484.

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In a world that is constantly in need of a continuous, reliable and sustainable energy supply, concentrating photovoltaic technologies have the potential to become a cost effective solution for large scale power generation. In this light, important progresses have been made in terms of cell’s design and efficiency, but the concentrating photovoltaic industry sector still struggles to gain market share and to achieve adequate economic returns. The work presented in this thesis is focused on the development of innovative solutions for high concentrating photovoltaics receivers. The design, the f

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4

Hess, Stefan [Verfasser]. "Low-Concentrating, Stationary Solar Thermal Collectors for Process Heat Generation / Stefan Hess." Aachen : Shaker, 2015. http://d-nb.info/1071528009/34.

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5

Allen, Kenneth Guy. "Rock bed thermal storage for concentrating solar power plants." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86521.

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Thesis (PhD)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Concentrating solar power plants are a promising means of generating electricity. However, they are dependent on the sun as a source of energy, and require thermal storage to supply power on demand. At present thermal storage – usually molten salt – although functional, is expensive, and a cheaper solution is desired. It is proposed that sensible heat storage in a packed bed of rock, with air as heat transfer medium, is suitable at temperatures of 500 – 600 °C. To determine if this concept is technically feasible and economicall

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6

Tseitlin, Musii, and Valentina Raiko. "Ratio between heat and mass transfer when concentrating the solution in a cooling tower." Thesis, Lviv Polytechnic National University, 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/42106.

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The ratio between the intensity of the mass transfer in gas and the heat transfer in liquid during the evaporative solution concentration has been studied. It was determined that the share of liquid resistance in the total resistance to enthalpy transfer increases in the temperature range from 30 to 50°C by almost 2 times, and reaches 40 %. The technique has been developed for the separate determination of the mass transfer coefficients in gas and heat transfer in liquid.<br>Досліджено співвідношення між інтенсивністю масопереносу в газі та передачею тепла в рідині під час концентрації випарно

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Guccione, Salvatore. "Design and Optimization of a Sodium-Molten Salt Heat Exchanger for Concentrating Solar Power applications." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279783.

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Concentrating Solar Power (CSP) is one of the most promising renewable energybased electricity generation technologies to deal with the increasing demand of power consumption and environmental sustainability. With the aim of achieving the 2020 SunShot cost target for CSP of 60 USD/MWh, the United States Department of Energy presented, in May 2018, the Gen3 CSP initiative. In particular, the CSP Gen3 Liquid-Phase Pathway proposes to design a CSP system adopting liquid sodium as Heat Transfer Fluid (HTF) in the receiver, advanced high-temperature molten chloride salt as storage fluid and supercr

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8

Nithyanandam, Karthik. "Investigations on Latent Thermal Energy Storage for Concentrating Solar Power." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/23189.

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Thermal energy storage (TES) in a concentrating solar power (CSP) plant allows for continuous operation even during times when solar radiation is not available, thus providing a reliable output to the grid. Energy can be stored either as sensible heat or latent heat, of which latent heat storage is advantageous due to its high volumetric energy density and the high Rankine cycle efficiency owing to the isothermal operation of latent thermal energy storage (LTES) system. Storing heat in the form of latent heat of fusion of a phase change material (PCM), in addition to sensible heat, significant

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9

Singh, Harjit. "An experimental study of natural convective heat flow phenomena in concentrating compound parabolic solar collector cavities." Thesis, University of Ulster, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516521.

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10

Al, Siyabi I. "Enhancing the performance of concentrating photovoltaics through multi-layered microchannel heat sink and phase change materials." Thesis, University of Exeter, 2019. http://hdl.handle.net/10871/35932.

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Concentrating Photovoltaic technology is considered now as a promising option for solar electricity generation along with the conventional flat plate PV technology especially in high direct normal irradiance areas. However, the concentrating photovoltaic industry sector still struggles to gain market share and to achieve adequate economic returns due to challenges such as the high temperature of the solar cell which causes a reduction its efficiency. The work presented in this thesis is targeted to influence the overall performance of a high concentrated photovoltaic system by integrating both

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11

Calderón, Díaz Alejandro. "Study of solid particle materials as high temperature Thermal Energy Storage and Heat Transfer Fluid for Concentrating Solar Power." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667863.

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Renewable energies have a major role in today’s energy systems development, energy security and climate change fight. Thermal Concentrating Solar Power (CSP) has the potential to get up to 11.3% of world’s electricity production with the adequate support. This type of renewable energy has proved to be price competitive and to have the advantage of integrating Thermal Energy Storage (TES). This adds the generation flexibility that other renewable energies, like wind or photovoltaics, does not have integrated. In order to continue developing this technology, solid particle CSP has been proposed

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12

Chikukwa, Actor. "Modelling of a Solar Stove: Small Scale Concentrating System With Heat Storage : Potential For Cooking In Rural Areas, Zimbabwe." Doctoral thesis, Norwegian University of Science and Technology, Department of Physics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1824.

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<p>The central objective of the present research is to serve as an in-depth technical introduction to small-scale concentrating systems tailored for application especially in rural areas in Africa located outside the national electricity grids. For example, MScand doctoral-students recently matriculated on NUFU-sponsership at some universities in Africa (i.e Mozambique, Uganda, Tanzania, South Africa and Ethiopia) for research in solar-concentrator technologies will find most of the material in this work quite useful.</p>

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13

Eames, Philip C. "A unified numerical model for optics and heat transfer within line-axis concentrating solar energy collectors : development, validation and parametric analysis." Thesis, Cranfield University, 1990. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278773.

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14

Trahan, Jamie. "A Technical and Economic Comparative Analysis of Sensible and Latent Heat Packed Bed Storage Systems for Concentrating Solar Thermal Power Plants." Scholar Commons, 2015. https://scholarcommons.usf.edu/etd/5598.

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Though economically favorable when compared to other renewable energy storage technologies, thermal energy storage systems for concentrating solar thermal power (CSP) plants require additional cost reduction measures to help transition CSP plants to the point of grid-parity. Thermocline packed bed storage is regarded as one potential low cost solution due to the single tank requirement and low cost storage media. Thus sensible heat storage (SHS) and latent heat storage (LHS) packed bed systems, which are two thermocline varieties, are frequently investigated. LHS systems can be further classif

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15

Xu, Ben. "Heat Transfer and Flow in Solar Energy and Bioenergy Systems." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/578616.

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The demand for clean and environmentally benign energy resources has been a great concern in the last two decades. To alleviate the associated environmental problems, reduction of the use of fossil fuels by developing more cost-effective renewable energy technologies becomes more and more significant. Among various types of renewable energy sources, solar energy and bioenergy take a great proportion. This dissertation focuses on the heat transfer and flow in solar energy and bioenergy systems, specifically for Thermal Energy Storage (TES) systems in Concentrated Solar Power (CSP) plants and op

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16

Madaly, Kamalahasen. "Identifying the optimum storage capacity for a 100-MWe concentrating solar power plant in South Africa." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86276.

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Thesis (MEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Central receiver power plants generate renewable electricity by exploiting the energy provided by the sun. The conditions experienced in the Northern Cape region of South Africa provide the ideal conditions for the development of these plants. Without a storage medium these plants have capacity factors in the range of 25-30%. The inclusion of a thermal energy storage medium provides the ability to increase the capacity factors of these plants. Although storage increases the costs, it results in better utilisation of the p

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17

Wang, Wujun. "Development of an Impinging Receiver for Solar Dish-Brayton Systems." Doctoral thesis, KTH, Kraft- och värmeteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177531.

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A new receiver concept utilizing impinging jet cooling technology has been developed for a small scale solar dish-Brayton system. In a typical impinging receiver design, the jet nozzles are distributed evenly around the cylindrical absorber wall above the solar peak flux region for managing the temperature at an acceptable level. The absorbed solar irradiation is partially lost to the ambient by radiation and natural convection heat transfer, the major part is conducted through the wall and taken away by the impingement jets to drive a gas turbine. Since the thermal power requirement of a 5 kW

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18

Benoit, Hadrien. "Récepteur solaire tubulaire à suspension dense de particules en écoulement ascendant." Thesis, Perpignan, 2015. http://www.theses.fr/2015PERP0045/document.

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Cette thèse, financée dans le cadre du projet européen CSP2, porte sur l'étude d'un nouveau type de récepteur solaire thermique à concentration utilisant comme fluide caloporteur une suspension dense de fines particules en circulation ascendante dans des tubes verticaux. Ladite suspension est obtenue par fluidisation de particules de classe A. Le principe consiste à créer un écoulement ascendant de la suspension dans un tube vertical exposé au rayonnement solaire concentré qui chauffe la paroi du tube, qui transmet ensuite cette chaleur aux particules, qui la transportent jusqu'à un cycle de c

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19

Nahhas, Tamar. "Materials and thermal storage systems by sensible heat for thermodynamic electro-solar plants." Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0027.

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L'énergie solaire est connue pour sa nature intermittente par rapport aux ressources d’énergie fossile. Cette observation souligne la nécessité d'utilisation d’un système de stockage d'énergie thermique. Le système de stockage thermocline est considéré comme un système de stockage rentable. La présente thèse vise à étudier le potentiel des roches basaltiques et siliceuses comme des candidates matériaux de stockage pour les centrales solaires concentrées. Les études expérimentales des propriétés thermo-physiques et thermomécaniques de ces roches à des températures allant jusqu'à 1000°C montrent

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20

Veynandt, François. "Cogénération héliothermodynamique avec concentrateur linéaire de Fresnel : modélisation de l’ensemble du procédé." Thesis, Toulouse, INPT, 2011. http://www.theses.fr/2011INPT0116/document.

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Le concentrateur à réflecteur linéaire de Fresnel (LFR) est une technologie solaire thermodynamique en plein essor : petites applications industrielles (chaleur, froid, électricité) à centrales électriques (10-100 MWel). Ce travail de thèse établit un modèle global du procédé solaire, en régime permanent, pour un prédimensionnement du système. Le modèle comprend trois parties chaînées : (i) les transferts radiatifs dans le concentrateur optique, modélisés précisément par une méthode de Monte Carlo (environnement EDStar) ; (ii) les transferts thermiques dans le récepteur, évalués analytiquement

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21

Kotze, Johannes Paulus. "Thermal energy storage in metallic phase change materials." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96049.

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Thesis (PhD) -- Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Currently the reduction of the levelised cost of electricity (LCOE) is the main goal of concentrating solar power (CSP) research. Central to a cost reduction strategy proposed by the American Department of Energy is the use of advanced power cycles like supercritical steam Rankine cycles to increase the efficiency of the CSP plant. A supercritical steam cycle requires source temperatures in excess of 620°C, which is above the maximum storage temperature of the current two-tank molten nitrate salt storage, which stores thermal

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22

Guarnieri, Raniero Alberto. "Novel approaches to the design of domestic solar hot water systems." Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/16056/1/Raniero_Guarnieri_Thesis.pdf.

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Domestic solar hot water units, if properly designed, are capable of providing all hot water needs in an environmentally friendly and cost-effective way. Despite 50 years of development, commercial technology has not yet achieved substantial market penetration compared to mainstream electric and gas options. Therefore, alternate designs are warranted if they can offer similar or greater performance for a comparable cost to conventional units. This study proved that such alternatives are possible by designing and testing two novel solar hot water systems (SHWS). The first system used com

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Guarnieri, Raniero Alberto. "Novel Approaches to the Design of Domestic Solar Hot Water Systems." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16056/.

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Domestic solar hot water units, if properly designed, are capable of providing all hot water needs in an environmentally friendly and cost-effective way. Despite 50 years of development, commercial technology has not yet achieved substantial market penetration compared to mainstream electric and gas options. Therefore, alternate designs are warranted if they can offer similar or greater performance for a comparable cost to conventional units. This study proved that such alternatives are possible by designing and testing two novel solar hot water systems (SHWS). The first system used com

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24

Hallberg, Maria, and Elin Hallme. "Introducing a central receiver system for industrial high-temperature process heat applications : A techno-economic case study of a large-scale CST plant system in a South African manganese sinter plant." Thesis, KTH, Kraft- och värmeteknologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-249067.

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The objective of this thesis was to investigate the potential for introducing a concentrating solar thermal (CST) central receiver plant system based on flexible heliostats - HelioPods - to provide high-temperature process heat in industrial applications. A CST plant system was designed in MATLAB, optically simulated for three design days in the ray-tracing software Tonatiuh and further analyzed in MATLAB by interpolating the results for each hour of the year. A case study was made on introducing a CST plant system based on HelioPods in a South African manganese sinter plant. The study include

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Kretzschmar, Holger. "The Hybrid Pressurized Air Receiver (HPAR) for combined cycle solar thermal power plants." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86377.

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Thesis (MScEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Concentrating solar power technology is a modern power generation technology in which central receiver systems play a significant role. For this technology a field of heliostats is used to reflect solar irradiation to the receiver located on top of the tower. An extensive review has shown that contemporary receiver designs face geometric complexities, lack of thermal efficiency as well as issues with durability and cost. The purpose of this study is to develop a new receiver concept that can potentially reduce these iss

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26

Espargilliere, Harold. "Système de refroidissement sec et de production d'eau pour centrale électrosolaire thermodynamique à cycle de Rankine." Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0004.

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Les centrales solaires à concentration industrielles consomment 4 m3/MWh d’eau pour le refroidissement de leur cycle thermodynamique. En environnement aride, cela est susceptible d'induire des conflits d’usages sur une ressource encore plus fondamentale que l’électricité, l'eau. Ce constat met en évidence la nécessité de concevoir des solutions alternatives de refroidissement sèches mais tout aussi efficaces. Le champ solaire d’une centrale CSP représente 50% de son coût d’investissement pour n’être utilisé que de jour pour la production de chaleur nécessaire au cycle thermodynamique. L'approc

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27

Kirby, Christopher Robin. "PLASMA ALDOSTERONE AND SWEAT SODIUM CONCENTRATIONS AFTER EXERCISE AND HEAT ACCLIMATION." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275288.

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28

Chan, Toong Khuan. "Stress concentrations in weld heat affected zones in aluminium-zinc-magnesium alloy." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259442.

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29

Wise, Ethan Allen. "Heat and Mass Transfer Modeling and Experimental Validation of a Novel Freeze Desalination Process." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/104019.

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Freeze concentration is a thermal separation process that is used to purify aqueous solutions. One application of recent interest is seawater desalination. For freeze concentration to be an effective desalination method, a high ice growth rate and product purity must be achieved with energy usage comparable to that of competing technologies. The purpose of this thesis is to develop a coupled heat and mass transfer model to predict the growth rate and purity of the solid phase for ice grown about a horizontal, immersed tube. By simultaneously solving the heat and mass transfer problems, this

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Berry, Mark P. McMurray Robert G. "The effect of exercise in the heat on circulating tumor necrosis factor-[alpha] concentration." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,1878.

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Thesis (M.A.)--University of North Carolina at Chapel Hill, 2008.<br>Title from electronic title page (viewed Dec. 11, 2008). "... in partial fulfillment of the requirements for the degree of Master of Arts in the Department of Exercise and Sport Science Exercise Physiology." Discipline: Exercise and Sports Science; Department/School: Exercise and Sport Science. On t.p. and in abstract, [alpha] is Greek letter.

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Lee, Lin. "The effect of flow rate, spray distance and concentration of polymer quenchant on spray quenching performance of CHTE and IVF probes." Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-050205-151345/unrestricted/LinLeeThesis.pdf.

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Harrod, Mary Kathryn. "Serial measurements of circulating glucose and luteinizing hormone concentrations in lactating dairy cattle." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/104678.

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The two objectives for this thesis were to 1) validate a bovine luteinizing hormone (LH) ELISA for use in the laboratory and 2) validate interstitial glucose sensors designed for humans for use in lactating dairy cattle. The first experiment required validation of a bovine LH ELISA in order to measure the circulating concentration of LH in the blood of cows in altered thermal and/or metabolic states. Assays from two separate companies were tested. Half of one plate was run at a time resulting in a total of 6 separate analyses (3 plates total). Despite early, promising results, neither LH ELISA

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Almohammedi, Abdullah Rajaallah. "Direct measurements of heme concentration in heart cells by Raman spectroscopy." Thesis, University of Leicester, 2016. http://hdl.handle.net/2381/37168.

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Resonance Raman spectroscopy is a powerful technique that yields specific molecular information on samples under study. It has been used as a powerful tool to understand the structure and states of heme proteins. The vibrational bands of heme are well known. However, excitation wavelengths of 488 and 405 nm have not been used before to provide physiologically relevant information in terms of the concentration and state of heme proteins in cardiomyocytes. The aim of this study was to develop a novel technique, resonance Raman microspectroscopy, to investigate the cellular responses of cardiac m

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Khosrowshahi-asl, A. "A study of the interaction of heat and concentration in the preparation of milk for cheesemaking." Thesis, University of Reading, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380834.

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Chandrapala, Janage Jayani Sandamau. "Effect of concentration, pH and added chelating agents on the colloidal properties of heated reconstituted skim milk." Monash University. Faculty of Science. School of Chemistry, 2008. http://arrow.monash.edu.au/hdl/1959.1/74618.

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The thermal processing of milk changes the composition and surface properties of the colloidal particles present and alters the physical properties of the milk. Whilst some changes such as those used to improve the texture of products such as yoghurt and are desirable, others such as gel formation during the manufacture of Ultra-High Temperature milk are highly undesirable. This work aims to characterize the effects of milk composition and pH on the chemical and physical changes that occur when milk is heated in order to understand and control the effect of thermal processing on the function

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Kuniyoshi, Minoru. "Studies on phenyl-modified polysiloxane low-melting glass : preparation through sol concentration method and rapid heat treatment." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/136322.

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Verma, Darpan. "Hybrid Solar Energy System with integrated Concentration Photovoltaic Cells and Thermoelectric Devices." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553613351859182.

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Li, Ying. "Heat-Related Mortality under Two Representative Concentration Pathways (RCPs) Emission Scenarios: Projections for the United States and China." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/2631.

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Public health effects associated with rising temperatures resulting from global climate change are expected to increase significantly in this century. Projecting future heat-related mortality is challenging due to considerable uncertainties, and national-level, large-scale impacts under the latest greenhouse gas emission scenarios remain largely unexplored. Here I estimate excess heat-related mortality in the continental United States and in 50 largest metropolitan areas in China in the 2050s under two Representative Concentration Pathways (RCPs) emission scenarios: RCP4.5 and RCP8.5. Using mo

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Sculptoreanu, Adrian Carleton University Dissertation Biology. "Intracellular concentration and membrane permeability ratio of sodium and potassium ion in cultured cardiomyocytes of the adult rat." Ottawa, 1988.

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Palmisano, Aldo Nicholas. "Nucleotide sequence and tissue-distribution of Chinook salmon hsp90 messenger RNA : response to heat shock, handling, and seawater, and comparison to plasma cortisol concentration /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/5389.

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Jacobi, Christoph, and Daniel Mewes. "Heat flux classification of CMIP5 model results using self-organizing maps." Universität Leipzig, 2019. https://ul.qucosa.de/id/qucosa%3A74181.

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We used the self-organizing maps (SOMs) method on eight models that participated in the Coupled model intercomparison project phase 5 (CMIP5) and two different greenhouse gases (GHG) concentration experiments. The SOMs were created from the winter 500 hPa horizontal temperature flux for each model. The clustering by the SOM revealed that in addition to the three flux pathways found in reanalyses (Pacific, Atlantic and Siberian/continental pathway), superpositions of these occur for the free running climate models, which develop their dynamic more freely than the reanalyses. It was found that t

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Venkataraman, Manoj. "THE EFFECT OF COLLOIDAL STABILITY ON THE HEAT TRANSFER CHARACTERISTICS OF NANOSILICA DISPERSED FLUIDS." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3656.

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Addition of nano particles to cooling fluids has shown marked improvement in the heat transfer capabilities. Nanofluids, liquids that contain dispersed nanoparticles, are an emerging class of fluids that have great potential in many applications. There is a need to understand the fundamental behavior of nano dispersed particles with respect to their agglomeration characteristics and how it relates to the heat transfer capability. Such an understanding is important for the development and commercialization of nanofluids. In this work, the stability of nano particles was studied by measuring the

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Acheampong, Nana Y. "Correlation between the Rates and Mortality of Ischemic Heart Disease and Magnesium Concentrations in Ohio Drinking Water." Youngstown State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1486115841327559.

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Myint, Cho Zin. "A new electronic device for measuring pulse and oxygen concentration." Thesis, Curtin University, 2011. http://hdl.handle.net/20.500.11937/1788.

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Sensor devices such as pulse oximetry are practical tools used by most healthcare professionals, and even patients. An electronic sensor device that has the capability to measure physiological signs of saturation of arterial oxygen (SpO2) and heart beat rate of the human body has been developed in this study.The hardware design of the sensor device consists of a microcontroller PIC18F452, an external flash memory, and a transceiver unit. The most suitable sensors of red and infra red LEDs are installed on the arms of the plastic clip and functioned with the right resistor values. The red and i

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Anh, Viet Bui, of Western Sydney Hawkesbury University, of Science Technology and Environment College, and of Science Food and Horticulture School. "A study of osmotic distillation in hollow fibre modul." THESIS_CSTE_SFH_Anh_V.xml, 2002. http://handle.uws.edu.au:8081/1959.7/4.

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Osmotic distillation is a process of removing water from an aqueous solution, driven by water vapour pressure gradient across a hydrophobic membrane. The process occurs at or below ambient temperature and under atmospheric pressure. This research project investigates the osmotic distillation process in hollow fibre modules using hollow fibres PP375, PV375 and PV660 supplied by Memcor Australia. Operating conditions such as temperature, feed concentration and brine cross flow velocity, but not the feed cross flow velocity, were found to have significant effect on the flux. Models for heat and m

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Miller, Veronica Susan. "Validation of a heat stress index and hydration of workers in tropical Australia." Thesis, Curtin University, 2007. http://hdl.handle.net/20.500.11937/1962.

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In many parts of Australia the climate is such that people are working long hours in the heat. Consequences of excessive environmental heat stress range from reduction in safety due to impairment of concentration, to heat illness, which in extreme cases can be fatal. A critical factor in tolerance of workers to environmental heat stress is their level of hydration. Maximising productivity without compromising the health and safety of the work force requires quantification of the degree of stress posed by the thermal environment. For this purpose a number of heat stress indices have been develo

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Viljoen, Adrienne. "Changes in cardiac troponin I concentration and echocardiographic parameters after semen collection in stallions." Diss., University of Pretoria, 2010. http://hdl.handle.net/2263/23255.

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This dissertation focuses on the effect of breeding on the myocardium of stallions using cardiac troponin I (cTnI) as the preferred blood biomarker for detection of myocardial cell injury. Haematological, echocardiographic and heart rate (HR) parameters are also reported. Fourteen clinically healthy phantom-trained stallions were assessed. Cardiac troponin I concentration was determined pre-semen collection and at 4, 6, 12 and 24 hours following semen collection. Predictors that were measured included mean HR during each stage of semen collection, maximum HR, area under the curve for HR and fr

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Deresz, Fermino. "Effect of different cooling systems on concentrations of certain hormones and free fatty acids at varying times during lactation of Holstein cows." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184260.

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In experiment 1, fourteen cows were blocked for milk yields and balanced for days in lactation. Treatments were: (1) Air conditioning (AC), five cows; (2) Evaporative cooling (EC), four cows; and (3) Conventional shade (S), five cows. Sequential samples were taken for 8 h at 12 min intervals starting at 2200 and then at hourly intervals for 13 h. Serum was assayed for insulin, thyroxine (T4), triiodothyronine (T3) and cortisol using a double-antibody radioimmunoassay procedure. Free fatty acids (FFA) were determined in serum by an enzymatic method. In experiment 2, ten cows were blocked for mi

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Meyers, Erin Elizabeth. "Afferent vs. efferent cervical vagal nerve stimulation: effects on blood glucose, insulin, and glucagon concentrations in rats." Thesis, University of Iowa, 2016. https://ir.uiowa.edu/etd/3144.

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Cervical vagal nerve stimulation (VNS) has been studied in the context of several conditions including epilepsy and depression. However, its effects on glucose metabolism, and its potentially beneficial effects in type II diabetes, have not yet been evaluated in humans. Efferent parasympathetic activation reduces hepatic glucose release and increases pancreatic insulin secretion, while afferent parasympathetic activation may increase hepatic glucose release and inhibit insulin secretion potentially through sympathetic activation. Thus, the effect of combined afferent and efferent cervical VNS

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Miller, Veronica Susan. "Validation of a heat stress index and hydration of workers in tropical Australia." Curtin University of Technology, School of Public Health, 2007. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=18028.

Full text

Abstract:

In many parts of Australia the climate is such that people are working long hours in the heat. Consequences of excessive environmental heat stress range from reduction in safety due to impairment of concentration, to heat illness, which in extreme cases can be fatal. A critical factor in tolerance of workers to environmental heat stress is their level of hydration. Maximising productivity without compromising the health and safety of the work force requires quantification of the degree of stress posed by the thermal environment. For this purpose a number of heat stress indices have been develo

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