Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Flux control"”.
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Conductive Membranes for Fouling Mitigation and Permeate Flux Control
… thesis explores fouling mitigation and permeate flux control through conductive modification of the microfiltration membrane, namely coating a layer of conducting polymer on the membrane surface, to improve the function and, subsequently, cost-effectiveness of filtration systems. In this work, a …
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Development of quorum-sensing circuits for metabolic flux control in Escherichia coli
… effectively addressed through dynamic metabolic flux control to favor different objectives over the course of the fermentation. This thesis aims to develop autonomous and pathway-independent regulation tools that can be applied to controlling metabolic fluxes in these contexts to improve …
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Direct Power Control of AC Motors
In this thesis, the possibilities of direct power control (DPC) of induction motors (IMs) and permanent magnet synchronous motors (PMSMs) fed by a voltage source inverter have been studied. Three different approaches of DPC for IMs and one for PMSMs are proposed and investigated. They are: (a) …
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Metabolic Pathway Optimization with Data Driven Approaches
The flux control coefficient (FCC) is a sensitivity coefficient that measures the percent change in flux as a result of a given percentage change in the activity of the enzyme. The higher the FFC the more controlling the step. However, the value for a flux control coefficient for a specific enzyme …
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Design study of outer rotor field excitation flux switching motor for electric vehicles
Flux switching machines (FSMs) that consist of all flux sources in the stator have been developed in recent years. They can be categorized into three groups that are Permanent magnet (PM) FSM, field excitation (FE) FSM and hybrid excitation (HE) FSM. Among these FSMs, the FEFSM offers advantages of …
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A Barkhausen Noise Testing System for CANDU Feeder Pipes
… consists of a four-channel arbitrary waveform flux control system (FCS), and the spring-loaded tetrapole prototype (SL4P) BN probe. The combination of the FCS and SL4P was shown to provide repeatable BN measurements on feeder pipe samples, with variations in air gaps between the SL4P poles and …
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Design improvements of 12 slot-14 pole hybrid excitation flux switching motor with 1.0 kg permanent magnet for hybrid electric vehicles
Flux switching machine (FSMs) is a new class of brushless motor used in the automotive industry and have been developed in recent years. The FSMs can be divided into three groups which are permanent magnet flux switching machine (PMFSM), field excitation flux switching machine (FEFSM) and hybrid …
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Design and control methods for high-accuracy variable reluctance actuators
This thesis presents the design and control techniques of a variable reluctance actuator for driving a reticle motion stage in photolithography scanners. The primary thesis contributions include the design and experimental demonstration of a magnetic flux controller that uses a sense coil …
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Design improvement of outer-rotor hybrid excitation flux switching motor for in-wheel drive electric vehicle
Due to in-wheel motors definite benefits of great controllability for each self-reliant wheel as well as the convenience of more space of cabin due to conventional mechanical transmission and differential gears are removed, more study and research of in-wheel motors used in pure electric vehicles …
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Forward and inverse metabolic engineering strategies for improving polyhydroxybyrate production
… phaB, acetoacetyl-CoA reductase, limited PHB flux. Beyond this, whole operon overexpression led to even higher PHB fluxes.In a nitrogen-limited chemostat, PHB flux did not change with dilution rate. Unlike prior pleiotropic perturbations, these systematic experiments could clearly conclude …
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Alpha-Glucan, Water Dikinase and the Control of Starch Degradation in Arabidopsis thaliana Leaves
… of alpha-glucan, water dikinase (GWD) in the control of starch degradation in Arabidopsis thaliana leaves. Starch is degraded at night in Arabidopsis leaves to provide carbon for metabolism and growth. The rate of starch degradation is constant through the night and is precisely regulated such …
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Determining the effects of alloy composition, forging technique, and flux on the strength of forge welds
… iron alloys, forge welding techniques, and fluxes was measured. The alloys used were 1018 steel, A36 steel and wrought iron. The forge welding techniques were the hydraulic press, the power hammer, and hand hammer. The fluxes were borax, fine silica sand, anti-borax, and no flux. Control …
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Development of glucose valves for metabolic engineering applications in E. coli
… may be used to dynamically redirect metabolite flux away from endogenous processes into production pathways. In this work, we develop and characterize a glucose valve. First, a novel E. coli strain was engineered to allow the redirection of glucose flux from central metabolism via glucokinase. …
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Space vector pulse-width modulation for multilevel inverters and solution to modulation dependent problems
… the need for synchronous PWM. The close loop control of synchronous PWM is complex especially during dynamics. The PWM for multilevel inverter is fairly complicated as compared to two-level inverter. Hence, aforementioned problem is more severe when multilevel inverter is used as a voltage …
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Optimal Finite Control Set Model Predictive Control Strategies for Induction Motor Drives
The finite control set model predictive control (FCS-MPC) for motor drives has been vigorously investigated during the past decade for control of current, torque, stator flux linkage, and other performances in a motor drive system. Model predictive torque control (MPTC) and flux control (MPFC) are …
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Magnetic Barkhausen Noise Testing: Steel Grades and Stress Response
… the same measuring system under reproducible flux-controlled magnetization conditions. This is in contrast to the majority of literature Barkhausen noise investigations, which have focused on case studies using different probes and systems under unknown conditions of flux, which therefore …
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Advanced control in smart microgrids
This thesis presents various advanced control strategies in smart microgrid applications. In recent years, due to the rapid depletion of fossil fuels, increasing demand of electricity, and more strict compulsory government policies on reduction of greenhouse gas emissions, renewable energy …
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Analysing concerted criteria for local dynamic properties of metabolic systems
… be measured in terms of their concentrations and fluxes. These measurements can be regarded as a phenotypic representation of all the complex interactions and regulatory mechanisms taking place in the underlying metabolic network. Such interactions determine the system's response to external …
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The effect of beta-oxidation or TCA cycle inhibition on mitochondrial function and the sensitivity of high resolution respiratory detection
… It measures the rate of oxygen consumption or flux at different respiratory states when appropriate substrates, uncouplers and inhibitors (SUIT protocols) are used. With this method, two substrate combinations are commonly used to assess medium-chain fatty acid β-oxidation; a) Octanoylcarnitine …