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 15 of 15 for “"balance technique"”.
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Mathematical simulation of gas and water coning in petroleum reservoirs by the dynamic material balance technique
… method which first computes the correct material balance and then calculates the saturation necessary to maintain this balance under the current flowing conditions. This work presents the results obtained from a coning model which used this technique. These results indicate that the model exhibits …
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Identification and Quantification of Greenhouse Gas Emissions from Oil and Natural Gas Operations Using an Aircraft-Based Mass Balance Technique
… in horizontal drilling and hydraulic fracturing techniques have led to a booming natural gas industry. Natural gas is considered a cleaner fuel alternative to coal, producing less carbon dioxide (CO2) upon combustion per unit energy produced, and therefore has been hailed as a bridge fuel during …
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EMI Noise Reduction Techniques for High Frequency Power Converters
… are three methods to reduce CM noise: symmetry, balance and shielding. The idea of symmetry concept is generating another dv/dt source to cancel the original dv/dt source. However, this method is very difficult to achieve and usually has more loss. The balance technique forms a Wheatstone bridge …
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PCB-Based Heterogeneous Integration of PFC/Inverter
… of the WBG devices. Symmetry and cancellation techniques are often employed to suppress CM noises in switching power converters. Meanwhile, shielding technique has been demonstrated to effectively suppress CM noises in an isolated converter with PCB-based transformer design. However, for …
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Turbulent mixing of unpremixed reactants in stirred tanks.
… concentration was measured using a fluorescence technique and a bifurcated fiber optic probe of custom design. Measurements were taken at two axial-radial planes within the tank. In the reacting case, the second-order reaction between sodium hydroxide and hydrochloric acid was studied, and …
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Identification of Thermoacoustic Dynamics Exhibiting Limit Cycle Behavior
… nonlinear response is achieved. A harmonic balance technique that linearly incorporates the nonlinearity is developed which uses frequency entrainment to offer sufficient information for the identification. Its validity is assessed on a model, which is based on known dynamics of the …
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SiC-Based High-Frequency Soft-Switching Three-Phase Rectifiers/Inverters
… is overcome by the proposed novel modulation technique. It is the first time that CRM-based soft switching modulation is demonstrated in the most conventional three-phase H-bridge ac–dc converter, and more than three-time size reduction compared with current industry practice yet 99.0% peak …
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Aircraft-based measurements for the identification and quantification of sources and sinks in the carbon cycle
… previously un-sampled sources. The aircraft mass-balance technique was used to quantify CH4 emissions from natural gas well pads in the drilling stage, which were 2-3 orders of magnitude higher than previous estimates of emissions from this stage. In addition, the first in-situ flare emission data …
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The effect of exercise on the utilization of dietary energy by the laboratory rat
… was to combine the carrying out of energy balance studies using the body balance technique, feeding diets of determined metabolizable energy content, with more detailed work on energy expenditure involving the use of indirect respiration calorimetry. Animals subjected to daily enforced …
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Spatial and temporal estimation of pumping and recharge in groundwater system analysis
… agricultural properties. Results show that the technique is able to capture the spatial and temporal variability in agricultural water demand in southwestern Louisiana over an 11 year time period. The second part of this dissertation research involves the use of a GIS-based net water balance …
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Nonlinear transient and steady state analysis for self-excited single-phase synchronous reluctance generator
… reluctance generators (SPSERG). Their unbalanced loads make their analysis more difficult. This research is motivated by the fact that SPSERG provides a good alternative to single-phase induction generators used in stand-alone generation applications. A general methodology is suggested …
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Rapeseed, Sunflower and Soybean Meals as Protein Supplements in Dairy Calf Starters
… the fate of the dietary protein by nitrogen balance technique. 4. To investigate the relationship between dietary protein and rumen volatile fatty acid (VFA) content</p>
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Understanding of Ammonia Transport In Pem Fuel Cells
… at 70oC, the data were obtained with a material balance technique, which uses an ion selective electrode (ISE) to determine the concentration of ammonium ion in the process streams. The results indicate that ammonia was not transported across the membrane when the feeds to both electrodes were …
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Effect of chia (Salvia hispanica l.) on the bioavailability of minerals, lipid profile, inflammation, oxidative stress, and intestinal health
… bioavailability were measured using the calcium balance technique. In addition, the effect of chia flour on biochemical markers, inflammation and oxidative stress was evaluated. Chia presented low calcium bioavailability, regardless of the type of diet consumed. However, chia consumption reduced …
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Control, Analysis, and Design of SiC-Based High-Frequency Soft-Switching Three-Phase Inverter/Rectifier
… (inverter and rectifier). The soft-switching technique with SiC devices grounded in CRM makes the operation of the ac-dc converter at hundreds of kHz possible while maintaining high efficiency with high power density. This is beneficial for rapidly growing fields such as electric vehicle …