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 26 for “"Ramp rate"”.
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Improved wind tunnel testing and data reduction methods using a magnetic suspension system
… systematic study of the incidence ramp technique established limitations set by the model aerodynamic properties, balance dynamics and data reduction methods. A simple relationship between the maximum ramp rate, the aerodynamic flow response time and the required data smoothing was …
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A diffusion-viscous analysis and experimental verification of the drying behavior in nanosilver-enabled low-temperature joining technique
… low temperature drying time and temperature ramp rate of nanosilver LTJT process, are experimentally studied and analyzed with the numerical simulation. The simulated results were consistent with the experimental findings that the quality of sintered silver bond-line increases with increasing …
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Investigation of defect formation and control in poly-crystalline anatase titanium dioxide
… that success by several methods. Lowering growth rate and increasing synthesis temperature sought to lower carrier concentration by increasing surface mobility of deposited atoms increasing the density of unannealed films. Varying the ramp rate used in annealing was also performed to test for …
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Spatially Diverse Photovoltaic Power Plants for Reduced Power and Voltage Fluctuation Using Weather Forecast
… of four sensors capable of sampling at high rate was developed to measure cloud shadow speed and direction to predict irradiation and PV power. A IEEE-34 node test feeder was used to simulate a power grid with PV power plants. The results indicated that power and irradiance could be predicted …
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Energy storage for frequency regulation on the electric grid
… can allow traditional thermal generators to operate more smoothly. However, using energy storage alone for frequency regulation would require an unreasonably large energy storage capacity. Duration curves for energy capacity and instantaneous ramp rate are used to evaluate the requirements and …
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Cobalt silicide characterization
… sizes of advanced ULSI (Ultra large-scale integrated) devices are driven by a desire for improve device performance and an increase in the number of devices on a single wafer. Small feature sizes cause increased resistance, which leads to degraded device performances. Silicides can reduce sheet …
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Thermo-Mechanical Reliability and Electrical Performance of Indium Interconnects and Under Bump Metallization
… and quality electrical contact between substrate and device. Bonded silicon test vehicles were comprised of Indium bumps and three UBM compositions: Ti/Ni/Au (200\xc5/1000\xc5/500\xc5), Ti/Ni (200\xc5/1000\xc5), Ni (1000\xc5). UBM and indium were deposited by evaporation and exposed to …
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Optimal Planning of Microgrid-Integrated Battery Energy Storage
… one of these parameters on the microgrid-integrated BES planning problem is investigated. Three microgrid-integrated BES planning models are developed to individually find the optimal values for the aforementioned parameters. These three microgrid-integrated BES planning models are then …
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Properties and Applications of Amorphous Gallium Arsenide Annealed to a Polycrystalline Form
… rich. When this material is annealed at moderate temperatures (400 to 500°C) it becomes polycrystalline and in some cases very conductive (rho = single digit mO-cm). Several aspects of the annealing were explored and annealing time, temperature, ambient, and ramp rate were all found to be …
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Modeling, control, and design of hybrid electrical and thermal energy storage systems
… of vehicles, including those with high ramp rate loads such as heavy construction and military vehicles. In this thesis, a hybrid electro-thermal energy storage system is introduced which offers a power-dense electro-thermal energy storage solution for future electrified vehicles. This …
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Model-based optimisation approaches for system energy performance improvement and evaluation
… conveyor belt system energy performance, avoid ramp rate violation problem in the periodic implementation of dynamic economic dispatch solutions, reduce the number of voltage sensors in photovoltaic (PV) fault diagnosis, improve PV maximum power generation through rearranging PV modules, and …
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Developing Highly Accelerated Life Test (HALT) method to improve product robustness and shorten development cycle
Highly Accelerated Life Testing (HALT) is often used to identify the latent defects for the printed circuit boards (PCBs) during the early stage of the product development process. The inconsistency in executing HALT may not reveal the maximum amount of design weaknesses or intermittent failures, …
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Electrical characterization of high temperature superconductors as a function of temperature
… with the broad face of the tapes. The current ramp rate effect on the critical current was investigated and showed no significant effect on the critical current measurements for ramp speeds between 6 A/min and 120 A/min. The energy dissipation or AC losses as a function of peak AC magnetic …
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Methods for optimization of neutron detector performance in nuclear power plants
… gain constants have been used to solve the power ramp-up case, allowing reduction of maximum margin-to-trip (MTT) loss to 0.8%. The risk model has been established in the FSN using historical data, and the risk factor for all channels has been identified. The initial channel table and risk …
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Development of Novel Synthetic Methods for Size-Tunable Synthesis of Superparamagnetic Iron Oxide Nanoparticles
… where regulatory approval requires demonstrated reproducibility in efficacy that can only be achieved with excellent size control. A number of methods for the synthesis of magnetic nanoparticles have been published, although the thermal decomposition of iron(III) precursors in organic …
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A Rapid and Power-Efficient Laser-Induced Graphene Micro-Thermocycler for DNA Polymerase Chain Reaction
… cycle. In particular, the LIG heater can be integrated directly on a polymeric film by laser scribing in one step, eliminating the need for photolithography or chemical vapor deposition, and the entire device can be fabricated in under 5 minutes. This work investigates the heating performance of …
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Demonstration of HVAC chiller control for power grid frequency regulation
… capability. The controller is further demonstrated to provide secondary frequency regulation continuously for several hours longer than the standard test routines, during which building cooling load changes significantly. Analysis of results indicate minimum power and variable COP as two …
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Cyber security threat modeling and experimental mitigation mechanisms in microgrids
… many agents, and at many different levels. One strategy has been to segment existing power systems into microgrids (MG), which include controllable loads and DERs operated under a single entity. Since MGs cover a smaller footprint and utilize new control approaches, they are emerging as an …
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Nonlinear Viscoelastic Wave Propagation in Brain Tissue
… step-and-hold uniaxial compression with 10 1/s ramp rate and 20 s hold time has been developed. The assumption of quasi-linear viscoelasticity (QLV) was validated for strain levels of up to 35%. A generalized Rivlin model was used for the isochoric part of the deformation and it was shown that …
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A methodology for integrated thermofluid modelling of radiant superheaters in steady state and transient operations
… of the global power system transformation. Integrated thermofluid process models can be employed to obtain a better understanding of the relationship between the operational conditions and the metal temperatures. Thus, a methodology was developed to model radiant superheater heat exchangers in …
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