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 42 for “"Long-term operation"”.
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The Design of a Power System For a Wireless Sensor Network For Long-Term Operation
… low charge consumption is needed to ensure long lifetimes and success of WSNs. This thesis details the design of a power system to support long-term operation of WSNs. The power system’s development occurs in parallel with a custom WSN from the Queen’s MEMS Lab (QML-WSN), with the goal of …
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Poly(dimethylsiloxane)-Based Microfluidic Electrochemical Devices
… membrane. The stability of the device for long-term operation was modeled using a stack of three fuel cells as a power supply for a portable display that otherwise uses a 3 V battery.
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The Effect Of Hot Carrier Stress On Low Noise Amplifier Radio Frequency Performance Under Weak And Strong Inversion
… scaled RF CMOS design, especially for long-term operation of these devices. The predicted degradation from simulation results can be used design reliable CMOS RF circuits.
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Materials Characterization and Spectroscopy for a Methane Abatement Catalyst
… and it is significantly more powerful as a short-term warmer, making it a valuable target for climate change mitigation efforts. Zeolites are earth-abundant minerals common in catalysis for their low price combined with high conversion and throughput potential. This study evaluates a specific …
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Challenges facing the development of new nuclear capacity in South Africa
… problems of loadshedding due to a lack of operational capacity, resulting in economic decline, and the climate concerns associated with fossil fuels, the addition of nuclear capacity is an appealing concept. This dissertation details several of the challenges associated with the development …
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Fate and Effect of Peracetic Acid Solutions on Biological Wastewater Treatment Systems
… and effluent samples collected at mid plant operation shifts; however, up to 25 mg/L PAA was detected in the DAF effluent at the end of the operation shift coinciding with emptying chiller tanks where PAA levels in excess of 1,000 mg/L are maintained. The PAA decomposition rate in poultry …
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Electrical Monitoring of Electromechanical Systems
… more easily attainable and improve the efficient operation of critical machines. Ensuring correct nonintrusive identification of load operation is a challenge in varying operating conditions and fault scenarios. Most nonintrusive load monitoring research assumes that data is static over time. …
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A demand responsive bidding mechanism with price elasticity matrix in wholesale electricity pools
… response, add uncertainties to both the short-term and long-term operation of the modem power systems. On the contrary, many modem power systems are characterized by the deregulated market structure. How to operate these features under deregulated power markets is worth consideration. This …
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Electronic detection of molecules on the exterior and molecular transport through the interior of single walled carbon nanotubes
… a major cause of sensor failure and also limits long term operation of the sensor. We show for the first time 1) the irreversible-to-reversible transition via simple surface amine chemistry, 2) integration with a micro-fabricated gas chromatographic (GC) column for selectivity. The platform …
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Investigation of performance and the influence of environmental conditions on strip detectors for the ATLAS Inner Tracker Upgrade
… from high-resistivity silicon, which allow operation even after the fluences expected towards the end of the proposed lifetime of the HL-LHC. Prototypes of different sensor designs have been extensively tested electrically as well as in testbeam setups, yielding generally satisfactory …
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ELECTRODEPOSITION OF POLYMER NETWORKS (EPON) AS CONFORMAL ULTRATHIN COATINGS
… are omnipresent in modern technology and often determine the performance and lifetime of devices. For example, in solid-state energy storage devices, electrolyte-type polymeric interfaces between battery components such as the active electrode material and solid electrolyte could overcome some of …
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Developing electrochemical methodologies towards addressing challenges in flow energy conversion technologies
… enhanced C-C bond cleavage activity and stable long-term operation, demonstrating successful translation from microscale screening to practical electrochemical systems. By systematically addressing the methodological bottlenecks that have constrained electrocatalyst discovery, this work provides …
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Evaluation of water distribution system monitoring using stochastic dynamic modeling
… model was developed, capable of simulating the operation of a water distribution system containing pumps and storage tanks, and subject to random demands and contaminant inputs. Long term operation of a hypothetical small town water supply system containing one pump station and one storage tank …
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Design and Manufacture of an Ultrasonic Transducer for Long-term High Temperature Operation
… are targeted for trouble-free continuous operation at 700-800 째C for at least two years, with sufficiently wide bandwidth to yield good temporal resolution. The design and manufacturing procedures were formatted as a multistep sequence, adaptable to a variety of transducer specifications …
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Leaching from High Capacity Arsenic-Bearing Solid Residuals under Landfill Conditions
… be used for arsenic removal, and assessing the long term behavior of these sorbents under landfill conditions. Our results indicate that microbial processes play a major role in the mobilization of As from granular ferric hydroxide (GFH). Long term operation of GFH sorbent showed that Fe (III) …
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Study on Thermoelectricc Properties of Mg2(Sn,Si,Ge) for power generation applications
… for power generation due to its reliability in long term operation. Recently, n-type Mg2Sn0.75Ge0.25 has been reported as a promising thermoelectric material system in the temperature range from 300 K to 723 K. By ball milling and hot pressing, the pure phase of Mg2Sn0.75Ge0.25 can be obtained. …
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Synthesis and characterization of thermally stable palladium-based composite membranes for high temperature applications
… in the temperature range of 500-600 ºC was determined. The results showed that doping Pd with Pt or Ru significantly reduces the leak growth rate compared to a pure Pd membrane by almost one order of magnitude. The addition of Ru to Pd was sufficient to lower the leak growth rate, though the …
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Long-term robot mapping in dynamic environments
… work is important in order to understand and determine the problems that occur with existing mapping techniques for persistent long-term operation. The primary contribution of the thesis is Dynamic Pose Graph SLAM (DPG-SLAM), a novel algorithm that addresses two core challenges of the long-term …
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The effects of variable operation on RO plant performance
… (RO) plants typically consider steady state operation of the plant. RO plants are subject to transient factors that may make it beneficial to produce more water at one time than at another. These factors can impact the optimal size of the plant. The electricity price is one factor of …
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Maltotetraose production using Pseudomonas stutzeri exo-alpha-amylase in a membrane recycle bioreactor
… use in the reactor system. The effects of four operational variables--concentration of the enzyme, substrate concentration, flux, and reactant volume--on the product concentration, G$\sb4$ production rate, and the relative product purity were examined. The productivity at a steady state under …
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