Dissertations / Theses on the topic 'Engineering novel membrane system'
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HOWARD, SHAUN CHRISTOPHER. "PHASE SEPARATION IN MIXED ORGANOSILANE MONOLAYERS: A MODEL SYSTEM FOR THE DEVELOPMENT OF NOVEL MEMBRANES." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1123873986.
Full textMillward, Huw Richard. "Novel membrane bioreactors." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317837.
Full textLloyd, Michael C. "Novel materials for membrane separation processes." Thesis, Aston University, 1995. http://publications.aston.ac.uk/9680/.
Full textMustapha, Rasha. "Hybrid refrigeration system with a novel membrane exchanger." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEM073.
Full textThe major objective of this thesis is to propose a methodology and a modeling tool to design high performance, affordable and flexible hybrid refrigeration and air conditioning systems. It focuses on hybrid systems based on coupling a desiccant cycle with a vapor compression cycle allowing an efficient humidity control in air conditioning applications and a frost free operation in refrigeration applications. The work was developed to investigate a novel design of a membrane based heat and mass exchanger using original membrane materials and new design related to liquid distribution. The design takes advantage of materials with low cost that are experimentally tested using a new methodology to infer their water vapor permeability that greatly affects the mass transfer. A prototype of the designed membrane exchanger is then built and a modeling approach of the heat and mass transfer phenomena is developed and is supported by experimental characterization. This model is then used to study the energy interest of the integration of these exchangers in air conditioning applications and to design a flexible architecture able to cope with the seasonal variation of the latent to sensible load ratio. The results show that the studied hybrid system present promising alternatives for conventional cycles where they can significantly improve the performance and decrease the consumption of electricity
Ramraj, Varun. "Exploiting whole-PDB analysis in novel bioinformatics applications." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:6c59c813-2a4c-440c-940b-d334c02dd075.
Full textBanks, Stacie. "The treatment of landfill leachate using an MFUF membrane system: Focusing on membrane fouling." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26572.
Full textShahriari, Zavareh Haleh. "Evaluation and modeling of a membrane activated sludge system." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26395.
Full textSmith, Shaleena. "Pilot assessment of Novel Membrane Bioreactor Processes - Improvements in Biological Nutrient Removal and Membrane Operation." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3357.
Full textAndhee, Avinash. "A novel compact Shearographic NDT system." Master's thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/5546.
Full textThere is a need in industry and the NDT (Non-destructive Testing) community for quick, reliable, user-friendly and cost-effective compact NDT systems that can be used on a wide variety of materials and structures, for quality assurance and maintenance. Designing and building a compact Shearographic NDT system will enhance the capability of inspection during quality assurance and maintenance routines as well as reduce inspection time. Older compact Shearographic systems, which have been tested satisfactorily both under laboratory and field conditions at the NDT Laboratory at the University of Cape Town, have a rather restricted field of view. This is due to the proprietary shearing optics being placed in front of the camera lens, which in other words means that the field of view can only be increased by using a relatively small focal length camera lens which results in having to increase the size of the shearing optics. This would make the compact Shearographic device much larger which is counter-productive since technology enables/directs research and development toward more compact devices.
Du, Preez Ryne. "Development of a membrane immobilised amidase bioreactor system." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/1996.
Full textChen, Lian. "A novel method for power system stabilizer design." Doctoral thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/5261.
Full textIncludes bibliographies.
Power system stability is defined as the condition of a power system that enables it to remain in a state of operating equilibrium under normal operating conditions and to regain an acceptable state of equilibrium after being subjected to a finite disturbance. In the evaluation of stability, the focus is on the behavior of the power system when subjected to both large and small disturbances. Large disturbances are caused by severe changes in the power system, e.g. a short-circuit on a transmission line, loss of a large generator or load, loss of a tie-line between two systems. Small disturbances in the form of load changes take place continuously requiring the system to adjust to the changing conditions. The system should be capable of operating satisfactorily under these conditions and successfully supplying the maximum amount ofload. This dissertation deals with the use of Power System Stabilizers (PSS) to damp electromechanical oscillations arising from small disturbances. In particular, it focuses on three issues associated with the damping of these oscillations. These include ensuring robustness of PSS under changing operating conditions, maintaining or selecting the structure of the PSS and coordinating multiple PSS to ensure global power system robustness.
Balakrishnan, Prabhuraj. "Engineering the membrane electrode assembly of direct methanol fuel cells using novel graphene architecture." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/engineering-the-membrane-electrode-assembly-of-direct-methanol-fuel-cells-using-novel-graphene-architecture(2088d92c-3891-4eb6-bc2b-5b1c71f4a2f6).html.
Full textRukas, Christopher J. "Prognostic Health Assessment of an Automotive Proton Exchange Membrane Fuel Cell System." Thesis, Rochester Institute of Technology, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1586450.
Full textProton exchange membrane fuel cells are a promising technology for the automotive industry. However, it is necessary to develop effective diagnostic tools to improve system reliability and operational life to be competitive in the automotive market. Early detection and diagnosis of fuel cell faults may lead to increased system reliability and performance. An efficient on-line diagnosis system may prevent irreparable damage due to poor control and system fatigue. Current attempts to monitor fuel cell stack health are limited to specialized tests that require numerous parameters. An increased effort exists to minimize parameter input and maximize diagnostic robustness. Most methods use complex models or black-box methods to determine a singular fault mode. Limited research exists with pre-processing or statistical methods. This research examines the effectiveness of a Naïve Bayes classifier on determining multiple states of health; such as healthy, dry, degraded catalyst, and inert gas build-up. Independent component analysis and principal component analysis are investigated for preprocessing. An automotive style fuel cell model is developed to generate data for these purposes. Since automotive applications have limited computational power, a system that minimizes the number of inputs and computational complexity is preferred.
ElSaadany, Mohamed. "A NOVEL IoT-BASED WIRELESS SYSTEM TO MONITOR HEART RATE." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1501023035755156.
Full textFuller, Anshuman. "Novel Perovskite-based electro-catalysts for Oxidative Dehydrogenation (ODH) of Ethane in an Electrochemical Membrane Reactor." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1439880541.
Full textEavarone, David A. (David Alan). "A novel nanodelivery system for combination tumor therapy." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/34158.
Full textIncludes bibliographical references (leaves 36-38).
Anti-angiogenic therapy offers many benefits over traditional cytotoxic chemotherapy including fewer toxic side effects and the reduced development of drug resistance. Anti-angiogenics alone have not proven effective in inducing tumor regression in the clinic due to both the cytostatic nature of anti-angiogenic therapy and the potential formation of new regions of hypoxia within the tumor after therapy. The new therapeutic paradigm is for combining both anti-angiogenics and traditional cytotoxic agents for a synergistic effect. The efficacy of cytotoxic agents may be reduced after anti-angiogenic therapy, however, due to limited access to tumor vasculature and hypoxia-induced drug resistance. We propose that loading cytotoxic agents within the tumor prior to blood vessel collapse will enable both greater drug accumulation within the tumor as well as a reduction in the formation of therapy-induced regions of hypoxia. We present here a novel nanodelivery vehicle termed a 'nanocell' for the spatio-temporal recruitment of both anti-angiogenics and cytotoxic agents within the solid tumor to achieve this goal. Nanocells consist of a polymeric nanocore encapsulating the cytostatic agent doxorubicin surrounded by a lipid vesicle containing the anti-angiogenic agent combretastatin A4.
(cont.) Nanocell treatment resulted in an 88% reduction in tumor size in vivo, compared to a 66% reduction in tumor size after delivering combretastatin A4 lipid vesicles and doxorubicin nanocores simultaneously but separately. Nanocell treatment also resulted in a significant reduction in systemic toxicity, fewer metastases to the lung and liver, and a greater degree of tumor apoptosis.
by David A. Eavarone.
S.M.
Petra, Mohamad Iskandar. "Novel hardwired distributive tactile sensing system for medical applications." Thesis, Aston University, 2007. http://publications.aston.ac.uk/12240/.
Full textElmer, Theo. "A novel SOFC tri-generation system for building applications." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/30516/.
Full textJefferies, Carol. "Modelling a novel, thin strip, continuous steel caster delivery system." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28788.
Full textThe steady-state, computational-fluid-dynamic (C. F. D.) model developed for this research is two-dimensional, and uses the finite-difference, control-volume formulation. The implicit solutions for the fluid flow and energy fields are fully coupled and include treatment of the solidification phenomena using the enthalpy-porosity approach. The model includes porous flow modifying regions within the delivery zone. These are treated as regions of complex media and make use of the "Brinkman-Forchheimer extended-Darcy" model. Turbulence was modelled using an ad hoc approach for both effective viscosity and effective thermal conductivity.
Numerical predictions of fluid flow were compared with experimental flow measurements and flow visualization using a water model of the proposed delivery system. The experiments confirmed that the flow modifiers had a very beneficial smoothing effect on fluid delivery to the substrate in the feeding system. The numerical predictions were in good agreement with the experimental results. As well, numerical predictions of shell thickness were compared with several different simple semi-analytical test cases.
The model was used for several parametric studies. The effect of flow modification, in conjunction with varying pool lengths, was studied. The model predicted that the presence of the flow modifiers would smooth the fluid flow to the substrate, and promote even extraction of heat, despite extension of the reservoir's length. Extending the pool length delayed the onset of solidification. Another study made predictions for cases with differing inlet and substrate boundary conditions, as well as for different exit gap sizes. This part of the work demonstrated the type of predictions possible with this model for use in the design of a prototype of the proposed delivery system.
Floyd, Tamara M. (Tamara Michelle) 1974. "A novel microchemical system for rapid liquid-liquid chemistry." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8273.
Full textIncludes bibliographical references (leaves 110-119).
Microchemical systems are sub-milliliter systems for chemical processes. They are constructed using microfabrication techniques originally developed for the fabrication of microelectronic circuits. The reduction in size, as compared to conventional systems, offers several advantages in improvement of heat and mass transfer and control of flow fields. In addition, microchemical systems are smaller, therefore inherently safer and capable of shorter thermal response times. The focus of this work has been a microchemical system with a multi-inlet contactor for liquid-liquid processes. The systems are fabricated using, primarily, silicon and glass in which feature sizes range from approximately 10 to 500 [mu]m. The multi-inlet contactor consists of 10 alternating inlets for two components. Fluids continuously enter the contactor, are focused by a converging channel, mix and react in a 50 m channel. The contactor is the central element in the microchemical system that also includes a parallel plate heat exchanger, infrared transmission detection capabilities and thin film metal temperature sensors. Quantitative data are obtained using on-chip optical detection methods, integrated thin film sensors, and off-chip pressure sensors. For microchemical systems, the length scales are short. Consequently, Reynolds numbers are small and the flow is laminar. When two or more streams are contacted in a homogeneous system, the flow is stable. The short length scales of the resulting lamellar stream enable rapid diffusion mixing for applications, such as kinetics studies or reaction-rate-limited operation of fast reactions.
(cont.) The mixing characteristics in the multi-inlet contactor are investigated through experiments and simulations. Without optimization, sub-second mixing times are achieved. By using experiments and simulations to gain a better understanding of diffusion mixing in the system, 99% mixing is achieved in less than 25 ms. Characterization of the microchemical system also includes determining the overall heat transfer coefficient for the parallel plate heat exchanger and demonstrating on-chip infrared transmission detection from 4000-1000 cm-1. Thus, these devices combine all the features necessary for kinetic studies, specifically control of residence time, control and monitoring of temperature, and concentration measurement by infrared spectroscopy. As a demonstration of microchemical systems as tools for kinetics studies, the microchemical mixer was used with in situ Fourier Transform infrared spectroscopy to monitor the alkaline hydrolysis of methyl formate. This reaction follows second order kinetics and is fast with a half life of 70 ms for the conditions used in this study. The rate constant that was extracted was in good agreement with the literature value. Moreover, in contrast to a previous study, no sample post processing was needed and the half-life of the reaction was reduced by an order of magnitude. Microchemical systems can also be useful tools in achieving and understanding heterogeneous fluid contacting. When an aqueous phase and organic phase are contacted in a 1:1 volumetric ratio, flow segregation can occur ...
by Tamara M. Floyd.
Ph.D.
Tierno, Nicholas C. "LONGITUDINAL CONTROL OF A NOVEL AIRBORNE WIND ENERGY SYSTEM." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1308165209.
Full textBall, Martin J. "Oxidation studies of a novel barrier polymer system." Thesis, Aston University, 1995. http://publications.aston.ac.uk/9789/.
Full textLarronde-Larretche, Mathieu. "Development of a novel membrane bioreactor for cost-effective wastewater treatment and microalgae harvesting." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/30805/.
Full textChan, Yau Chung John. "A novel electric power quality monitoring system for transient analysis." Thesis, City University London, 2014. http://openaccess.city.ac.uk/5911/.
Full textShafieian, Dastjerdi Abdellah. "A solar‐driven membrane‐based water desalination/purification system." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2020. https://ro.ecu.edu.au/theses/2323.
Full textNing, Dawei. "A novel wireless based architecture for museums." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27161.
Full textYang, Shuming. "A novel chip interferometry system for online surface measurements." Thesis, University of Huddersfield, 2009. http://eprints.hud.ac.uk/id/eprint/6311/.
Full textNewman, Stephen. "The discovery and development of a novel photosolubilisation system." Thesis, University of East Anglia, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280998.
Full textKeon, Neil. "Simulation of the proton exchange membrane fuel cell: Dynamic modelling and an environment." Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/9667.
Full textPeng, Hui. "The treatment of bilge water using a MF/UF hybrid membrane system: Membrane fouling, cleaning and the effect of constituents on flux decline." Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6110.
Full textAw, Eng Sew 1978. "Novel monitoring system to diagnose rail track foundation problems." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/30044.
Full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 175-177).
A low cost, remote monitoring system has been developed to diagnose rail track subgrade failures. The portable monitoring system consists of five liquid vertical settlement probes, one piezometer, a small data acquisition system and laptop, and an Internet communication with remote control capabilities. The probes are designed to be small, easily installed (within railbeds using a one-man auger), easily manufactured, and low cost. The sensors and data acquisition have been rigorously tested and calibrated in the laboratory. The settlement probes and piezometer are sensitive to changes in the atmospheric pressure and temperature, and calibration curves have been obtained to correct for these effects. The settlement probes are further subjected to silicone oil density changes due to differential temperature between the atmosphere and the ground, and these effects are minimised by a proposed correction method. The prototype monitoring system was installed through a two phase installation exercise at the bridge approach site in FAST (Facility for Accelerated Service Testing) at Transportation Technology Centre Inc (TTCI), Pueblo, Colorado, USA. Since there are virtually no settlements at the stiff, sandy bridge approach site, the sensors are evaluated for ideal stability and robustness while being subjected to well-defined Heavy Axle Train (HAL) loadings. A detailed evaluation of the prototype system found that probes installed at depths 1.0 to 1.5m within the subgrade did not achieve satisfactory measurement stability (i.e. measurements have a spurious drift), due principally to manufacturing defects. The prototype probes were sufficiently robust to survive installation within the subgrade but not within the ballast itself.
(cont.) The probe designs have subsequently been refined to eliminate sources of drift, and have undergone more extensive calibration to account for differential temperature effects. These second generation probes are scheduled for field deployment as part of the on-going research.
by Aw, Eng Sew.
S.M.
Bhathena, Jasmine. "A novel oral polymeric membrane Lactobacillus formulation for amelioration of Non-Alcoholic Fatty Liver Disease and associated disorders." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103524.
Full textLa stéatose non alcoolique (NAFLD) est souvent trouvée chez les patients atteintes de l'obésité, du diabète ou de la dyslipidémie. Actuellement, il n'y a aucune intervention thérapeutique pour traité ce désordre potentiellement sérieux. Le premier défi est de diminuer la graisse dans le foie et alors la progression vers le steatohepatitis et la fibrose, et le risque suivant de cirrhose. Cette thèse a pour but d'étudier et développer une modalité de traitement pour l'usage dans NAFLD. Spécifiquement, cette thèse vise à développer une formulation orale qui contient de cellules bactériennes probiotique micro-encapsulée. Ces bactéries possèdent une estérase de feruloyl active qui a pour but, l'amélioration de NAFLD et le faisceau associé des maladies. La formation et la préparation des lactobacilles micro-encapsulés dans l'alginate-poly-L-lysine-alginate (APA) ont été établies et optimisées. L'activité d'estérase de feruloyl, le rendement d'acide férulique produit, la viabilité gastro-intestinale et la stabilité des lactobacilles micro-encapsulés d'APA ont été déterminés in vitro dans des flacons aussi bien que dans un modèle gastro-intestinal dynamique, simulé et contrôlé par ordinateur. Les cellules Lactobacillus fermentum 11976 actives d'estérase de feruloyl micro-encapsulé se sont avérés le plus approprié pour l'analyse en temps réel que pour des applications thérapeutiques orales. Les résultats in vivo montrent que dans notre modèle original de hamster, un régime riche en cholestérol et à haute teneur de graisses induit NAFLD, l'obésité centrale, la résistance d'insuline, et la dyslipidémie. Le traitement avec la formulation probiotique Lactobacillus fermentum 11976 micro-encapsulés a été administré aux hamsters atteintes de NAFLD. En comparaison avec les hamsters non traités, le traitement a révélé la diminution de plusieurs indicateurs comme les suivantes : risque d'un événement coronaire, la formation de plaques athérosclérotique, l'accumulation de gras hépatique. Aussi, les enzymes associés au foie endommagée, plus spécifiquement, la transaminase d'alanine [ALT], la transférase de Gamma-glutamyle [GGT]) sont revenu aux niveaux plus normales. En outre, la résistance d'insuline et l'obésité centrale ont été réduites, une meilleure commande glycémique a été réalisée, et la progression de divers autres paramètres d'événement pathologique aux formes graves de NAFLD ont été atténuée. Élucidation des mécanismes par lesquels cette formulation affirme son effet bénéfique est proposé. Ce travail indique l'immense potentiel de la formulation probiotique orale du Lactobacillus fermentum 11976 micro-encapsulés comme thérapie pour NAFLD et autres maladies associées. D'autres études poursuivront pour déterminer la capacité de ce traitement comme option thérapeutique dans la population humaine.
Davies, Neale. "Novel, induced flow, centrifugal water pumping system for off grid application." Thesis, University of Liverpool, 2015. http://livrepository.liverpool.ac.uk/2037461/.
Full textCimenler, Ummuhan. "Molecular-Size Selective Zeolite Membrane Encapsulated Novel Catalysts for Enhanced Biomass to Liquid (BTL) Processes." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6644.
Full textStone, Erica. "Development of a Novel Membrane Process for the Immediate Production of Drinking Water from Varying Quality Aqueous Sources." Honors in the Major Thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/1002.
Full textBachelors
Engineering and Computer Science
Environmental Engineering
Foley, Brian S. B. (Brian M. ). Massachusetts Institute of Technology. "Solar thermal collector system modeling and testing for novel solar cooker." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92179.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (page 22).
Solar cookers are aimed at reducing pollution and desertification in the developing world. However, they are often disregarded as they do not give users the ability to cook after daylight hours. The Wilson solar cooker is a solar cooker designed to address this problem by converting solar energy and storing that energy as heat in the form of molten salt (lithium nitrate). This thesis involved research, modeling, and experimentation for the solar collection system of the cooker. This thesis looked at prior research on glazing, Fresnel lenses, and absorber surface treatments to identify and evaluate elements for use in the collection system. Borosilicate glass, with a thermal conductivity of 1.005 W/mK and a solar transmittance of 0.91, and flat black paint, with absorptivity 0.96 and emissivity 0.88 were identified as potential elements for use in first trials. Experimentation was performed on copper and aluminum samples with various surface treatments powered by various Fresnel lenses to evaluate the relative efficiency of these treatments. A novel treatment method, machining a conical hole into the sample, was found to improve efficiency on untreated samples, but inferior to flat black paint. Modeling predicted that the minimum collection area for an acrylic Fresnel lens off-number 1.2 was 0.60 m² for and 0.65 m² for the proposed collector without and with glazing, respectively. A recommendation of collection area 1 m² was proposed to account for unexpected losses due to manufacturing errors, positioning errors, and environmental variation. This thesis also analyzed a proposal for a novel solar collector, a polished aluminum cone. Modeling and efficiency testing showed the cone to be inadequate for the radiation collection needed for the solar cooker.
by Brian Foley.
S.B.
Bonner, Ross A. (Ross Anthony). "Design and development of a novel liquid desiccant air-conditioning system." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/129027.
Full textCataloged from student-submitted PDF of thesis.
Includes bibliographical references (pages 105-108).
The Direct Evaporative Closed Air Loop (DECAL) system is a novel high efficiency liquid desiccant air-conditioning (LDAC) system which runs primarily on thermal energy rather than electricity. It is designed for residential cooling in hot and humid climates where demand is growing rapidly and incumbent direct-expansion system performance is poor. Unlike other LDAC systems, DECAL is modular. This allows the indoor hardware to remain small and non-intrusive, and offers increased flexibility to install the system in existing building stock without costly changes to the structure. This work lays out the basic operating cycle of the DECAL system and shows its thermodynamic merits in terms of ideal system performance against other LDAC systems. Design studies show DECAL offers improved thermal efficiency, especially in humid climates. The ideal thermal coefficient of performance (COP[subscript th]) is 1.24 at the design point ambient condition of 35C, 60% RH.
A mathematical model is built to better characterize performance and optimize the system design. With transport inefficiencies included, the optimal system electrical and thermal COP (COP[subscript e] and COP[subscript th]) are 46.3 and 0.759 respectively for a LiCl system at the design point. These results show the DECAL system could reduce electrical consumption by over 85% from present day best-in-class systems using low-grade thermal energy. A benchtop scaled test of the closed air loop is constructed to validate the model. Experimental test results agree well with the model predictions for evaporative cooling effectiveness and sensible heat exchange, as well as pressure drop. The drying effect of the LAMEE is lower than anticipated. This is likely due to crystallization of liquid desiccant in the pores of the membrane, resulting in a high vapor diffusion resistance. Adjusting for this effect, full system test measurements match the system model well.
The benchtop rig testing verified that the closed air loop is capable of generating a sensible cooling effect, but further testing is required to demonstrate modelled figures of merit are achievable.
by Ross A. Bonner.
S.M.
S.M. Massachusetts Institute of Technology, Department of Mechanical Engineering
Meier, Stephan. "Novel voltage source converter based HVDC transmission system for offshore wind farms." Licentiate thesis, KTH, School of Electrical Engineering (EES), 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-568.
Full textOffshore wind farms have recently emerged as promising renewable energy sources. For increasing distances between offshore generation and onshore distribution grid, HVDC transmission systems based on voltage source converters can be a feasible and competitive solution. This thesis presents a comprehensive evaluation of a novel integrated wind farm topology that includes the generator drive system, the turbine interconnection and the HVDC transmission.
In the proposed concept, every wind turbine is connected to a single-phase medium-frequency collection grid via a distribution transformer and a cycloconverter, which allows the wind turbines to operate at variable speed. The collection grid is connected to an HVDC cable via a transmission transformer and a single-phase voltage source converter. This thesis evaluates in detail the principle of operation, which is also verified with system simulations in PSCAD.
The proposed concept promises several potential benefits. Converter switching losses and stress on the semiconductors for example can be considerably reduced by applying a soft-switched commutation scheme in all points of operation. Single-phase medium-frequency transformers have comparably low losses and their compact size and low weight implies an important benefit in an offshore environment. In addition, the voltage source converter is considerably simplified by the reduction to one phase leg, which implies a substantial cost saving.
Several technical challenges are identified and critically evaluated in order to guarantee the feasibility of the proposed concept. Especially the design of the medium-frequency collection grid is crucial as unwanted system resonances can cause dangerous overvoltages. Most of the technical challenges concern the specific characteristics of the proposed concept. The insulation of the single-phase medium-frequency transformers for example needs to withstand the high voltage derivatives. This thesis contains also considerations regarding the dimensioning and optimization of different system components.
A survey of different transmission systems for the grid connection of wind farms shows the potential of the proposed concept, which addresses several problems associated with electrical systems of wind farms. Both the requirements for variable-speed operation of the wind turbines and an interface for HVDC transmission are fulfilled in a cost-effective way. Compared to conventional voltage source converter based HVDC transmission systems, the initial costs are reduced and the expected annual energy production is increased. In addition, the proposed voltage source converter based HVDC transmission system can fully comply with recent requirements regarding the grid connection of wind farms.
Cheng, Sheng. "Novel implementation technique for a wavelet-based broadband signal detection system." Thesis, University of Warwick, 2010. http://wrap.warwick.ac.uk/4515/.
Full textLycksam, Andreas, and Martin Andersson. "Development of a novel test system for the ATLAS-upgrade at CERN." Thesis, Uppsala universitet, Högenergifysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-353803.
Full textATLAS-upgrade experiment
Linga, Srujan. "A novel positioning system for accurate tracking in indoor environments." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40530.
Full textIncludes bibliographical references (p. 91-93).
Precise positioning is crucial to many applications involving autonomous robots in indoor environments. Current solutions to the indoor localization problem are either both highly unreliable and inaccurate (like GPS based systems), or hugely expensive (such as the iGPS system). In this thesis we propose, design and build a low-cost, robust and highly accurate indoor localization system using laser light sources. The system is composed of three transmitting laser modules arranged in a straight line and a receiver module mounted on the mobile robot. The system calculates the coordinates of the mobile robot by using triangulation algorithms which require precisely measured values of the angles of the receiver with respect to the three laser emitters. Results from practical testing of the system in an aircraft wing assembly set-up have been found to be extremely encouraging. Using our system, the mobile robotic arm could be localized accurately within error margins defined approximately by Gaussian distributions centered at the object's true coordinate values and with standard deviations of 0.1778 mm, 0.1016 mm and 0.3352 mm in the x, y and z coordinate directions respectively. The system is also used to detect height drop in the arm due to its weight as it extends to perform fitting operations on the skin of the wing. Feedback from the laser localization system is used to adjust the position of the tip of the robotic arm in order to perform a sequence of high precision docking tasks within the aircraft wing.
by Srujan Linga.
S.M.
Zhou, Mo S. M. Massachusetts Institute of Technology. "Simulation of a novel multiprocessor system based on dataflow principles." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106071.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 53-54).
This thesis research is a study of a novel processor architecture for a massively parallel computer system. An existing simulation of the Fresh Breeze architecture has been extended to incorporate a multi-level memory hierarchy and dynamic load balancing. An efficient hardware-based garbage collection mechanism has been proposed. Various design trade-offs are evaluated. The simulation demonstrates that the architecture can support memory access with DRAM latency and still achieve high processor utilization.
by Mo Zhou.
S.M. in Computer Science and Engineering
Song, Jamie 1977. "Optimization of data acquisition system for novel DNA sequencing instrument." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86500.
Full textIncludes bibliographical references (leaf 61).
by Jamie Song.
S.B.and M.Eng.
Panda, Amayika. "A Novel Configurable Benchmarking System for Multi-core Architectures." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1300479983.
Full textKing, Ryan N. (Ryan Nicholas). "Design of a novel six-axis metrology system for meso-scale nanopositioners." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/54500.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 55).
The purpose of this research is to develop the best possible means and methods of building a six axis metrology system given cost and space constraints. Six axis measurements are a crucial part of precision engineering and characterizing machine performance, however commercially available sensors are not cost-efficient and are difficult to incorporate into meso-scale machines. The novel approach presented here uses three pairs of laser diodes and quadrant photodiodes to achieve six axis measurements. This paper presents a general parametric model that can predict the output of the photodiodes due to translations and rotations of the target for any geometry of the system. The device has performance characteristics of translational resolution in the range of microns depending on the geometry of the system, a bandwidth of 17.5 MHz, and dominant noise in the sensor of ±1.6 nm. This device will be useful in a variety of applications including nanomanufacturing, bio instrumentation, Dip Pen Nanolithography, AFM, and many more.
by Ryan N. King.
S.B.
Gentile, Margaret H. "A novel personal cooling system for use by soldiers in hot climates." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/65301.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 50).
CD-ROM contains multimedia supplemental material for thesis.
This report focuses on the design, testing and fabrication of a lightweight personal, portable cooling system for use by soldiers beneath their Interceptor body armor. An alpha prototype was constructed and was used to generate promising, quantitative results. This first level data was combined with an analysis of the strengths and weaknesses of the design to lay down the framework for the beta prototype which will be constructed at a later date. The military and physiological requirements for such a device are briefly discussed, as are concerns over fit, wearer comfort, product durability and ease of use.
by Margaret H. Gentile.
S.B.
Zhang, Xingxing. "Investigation of a novel solar photovoltaic/loop-heat-pipe heat pump system." Thesis, University of Hull, 2014. http://hydra.hull.ac.uk/resources/hull:8422.
Full textLunka, Alex A. "Development of a Novel Air-to-Liquid Mass Transfer Mechanism." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1415121834.
Full textCarradori, Dario. "Novel nanoparticle-based drug delivery system for neural stem cell targeting and differentiation." Thesis, Angers, 2017. http://www.theses.fr/2017ANGE0056/document.
Full textNeural stem cells (NSCs) are located in specific regions of the central nervous system called niches. Those cells are able to self-renew and to differentiate into specialized neuronal cells (neurons, astrocytes and oligodendrocytes). Due to this differentiation property, NSCs are studied to replace neuronal cells and restore neurological functions in patients affected by neurodegenerative diseases. Several therapeutic approaches have been developed and endogenous NSC stimulation is one of the most promising. Currently, there is no active molecule or therapeutic system targeting endogenous CSNs and inducing their differentiation at the same time. The aim of the work was to provide a drug delivery system able both to target endogenous CSNs and to induce their differentiation in situ. Here, we developed and characterized lipidic nanoparticles (LNC) targeting endogenous NSCs. A peptide called NFL-TBS.40-63, known for its affinity towards NSCs, was adsorbed at the surface of LNC. We observed that NFL-LNC specifically targeted NSC from the brain and not from the spinal cord in vitro and in vivo. To explain this specificity, we characterized and compared NFL-LNC interactions with the plasmatic membrane of both cell types. Finally, we demonstrated that by loading retinoic acid in NFL-LNC we were able to induce brain NSC differentiation in vitro and in vivo. This work contributes to the development of efficient and safe therapies for the treatment of neurodegenerative disease via the differentiation of endogenous NSCs
Freegah, Basim. "Design, development and optimisation of a novel thermo-syphon system for domestic applications." Thesis, University of Huddersfield, 2016. http://eprints.hud.ac.uk/id/eprint/31172/.
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