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.
Results
Showing 1 to 19 of 19 for “"Energetic Efficiency"”.
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Extracting principles from biology for application to running robots
… of the effect of swing leg retraction on the energetic efficiency of running proposes the use of optimal control in the principle extraction process and finds that swing leg retraction can minimize impact between the foot and the ground, but shows that this does not necessarily improve overall …
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The effects of individual-level differences in metabolic rate on foraging behavior and life history traits in honeybees
… place foragers such as honeybees maximize their energetic efficiency rather than the rate of energetic gain, given the critical role of energetic costs on foraging decisions. We therefore tested if individuals with low or high metabolic rates differ in efficiency maximization, using genetic lines …
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Development and assessment of integrated powering systems with alternative fuel choices for clean transportation
… thrusting energy of 38 MW, with 43.4% and 52% energetic and exergetic efficiency, respectively, under cruising conditions. However, the maximum power of SOFC-turbofan is 48MW, including 7.3 MW of turbofan power, 39.8 MW of thrust energy, and 0.94 MW of the SOFC. The overall energetic and …
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Defining Key Engineering Parameters to Advance Electrochemical CO₂ Separation Technologies
… interdependent performance descriptors (e.g., energetic efficiency, faradaic efficiency, and separation capacity or flux) whose complex interplay convolutes determination of the optimal design space. To address this, my research focuses on developing modeling frameworks to better understand the …
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Irreversibilities and nonidealities in desalination systems
… thesis identifies thermodynamic limits for the energetic performance of desalination systems and establishes the importance of irreversibilities and solution composition to the actual performance obtained. Least work of separation for a desalination system is derived and generalized to apply to …
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Using microscale flow cells to study the electrochemical reduction of carbon dioxide
… reduction of CO2 to CO: (1) low reaction energetic efficiency; (2) low reaction rate; and (3) poor reaction selectivity. This dissertation reports an investigation of roles electrolytes, operating conditions, and catalysts can play in the reduction of CO2. The anion and cation size, along …
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Diet-induced thermogenesis in the domestic chicken
Four experiments were conducted to examine the energetic responses of chicks from lines divergently selected for 56-day body weight to caloric intake. Caloric overconsumption or calorie-protein imbalances were induced by providing glucose solutions (16% w/v) in lieu of water in the first …
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Dynamic Mechanical Properties of Resilin
… in dragonflies does not act to improve the energetic efficiency of flight or as a power amplifying spring. Rather, it likely functions to passively control and stabilize the trailing edge of each wing during flight.
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TALLOW FOR LAYING HENS
… improvement at higher tallow levels. Maximum net energetic efficiency was obtained with 2 and 4% tallow. Ability to digest tallow declined significantly with hen age. Higher tallow ME values were obtained from calorimetry data than from digestibility measurements due to beneficial effects of …
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Vegetation, wildlife, and human foraging in prehistoric western Virginia
… prehistoric human foragers strove for maximum energetic efficiency. The model was driven by an objective function, that minimized the cost (expressed in hours of labor) of the human foragers' diet. Constraints on the achievement of this goal were the available metabolizable energy in selected …
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The Study of a Unique Athletic Population: Health Concerns, Interventions, and Prevention in Elite Ballet Dancers
… based upon their fat-free mass, and thus greater energetic efficiency as a result of chronic energy deficiency. As hypothesized, dancers reported a significantly lower energy intake and exhibited a lower RMR as compared to lean, pair-matched controls. Because treatment of these metabolic …
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Electrochemical and spectroscopic insights into the electroreduction of carbon dioxide to value added chemicals
… three Cu-based electrodes exhibit high Faradaic efficiency (FE) of CO2 reduction toward C2H4 production. The CuSn-DAT electrode exhibits the highest FE for CO (~90% at -0.4 V) and C2H4 (~60% at -0.8 V) production and high current density (~-225 mA/cm2). In situ Surface Enhanced Raman Spectroscopy …
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Conducting polymers for electrochemically mediated separations
… suppression of water parasitic reactions, high energetic efficiency, and selectivity for target organic species. The ability to modulate the hydrophobicity of conducting polymers and physicochemical insights about the material are significant for developing broader applications in drug delivery, …
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Mitochondrial dysfunction in a cell model of thyroid oncocytoma
… metastasis to the breast. In order to assess the energetic efficiency of these cells, they were incubated in a medium lacking glucose and supplemented instead with galactose. When subjected to such conditions, glycolysis is effectively inhibited and the cells are forced to use the mitochondria for …
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Computational Principles of Brain Network Development
… functional configuration in space and energetic efficiency together coalesce. In Chapter 5 I summarise key take-aways and provide what I believe to be promising future avenues for the applications of computational modelling to developmental systems neuroscience.
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La Seguridad Energética como factor relevante para el desarrollo de la autonomía estratégica de la UE (2014-2021)
… to make a huge effort to keep a high level of energetic security, which is not always possible due to inner weaknesses in the European Union energy system as well as the susceptibility of its external position. This fact has become more worrying for over a decade because of, among other facts, …
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Morphological and functional study of cerebral aging in rat
… endogenous stressful stimuli. Due to their high energetic requests and post-mitotic nature, neurons are peculiarly susceptible to this phenomenon. However, the aged brain maintains a certain level of adaptive capacities and if properly stimulated may warrant a considerable functional recovery. …
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Technoeconomic and mechanistic insights into the electroreduction of carbon dioxide to value added chemicals
… the OER (and not the CO2 reduction) to be the energetically intense step, consuming nearly 90% of the electricity input. Hence, identifying and utilizing anode reactions with lower energy requirements than the OER could result in a radical lowering (i.e., a step change) in the electricity …
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Contribución al análisis y procesado de señales fotónicas multibanda
… In addition, we present filters with high energetic efficiency and we perform an analysis of this device. The final part of this Thesis (Chapter 7) is devoted to the study of the polarization properties in Fiber Bragg Gratings when they present birefringence. This work was made in …