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 90 for “"Net energy"”.
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Toward zero net energy buildings : optimized for energy use and cost
Recently, there has been a push toward zero net energy buildings (ZNEBs). While there are many options to reduce the energy used in buildings, it is often difficult to determine which are the most appropriate technologies to implement. To reach zero energy, some designs extensively rely on the use …
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The Relationship Between Economic Growth and Fossil Fuel Energy Consumption Growth in Net Energy-Importing Emerging Economies
… between economic growth and fossil fuel energy consumption through three interrelated chapters—each of which addresses a facet of the relationship. The first chapter argues that mainstream explanations for Industrial Revolution generally assign a pride of place to institutional—secure …
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Description and commissioning of a novel swine calorimeter unit to calculate heat production and net energy in group-housed pigs
Values for digestible energy (DE), metabolizable energy (ME) and net energy (NE) are used to develop prediction equations for diet formulation, usually calculated from data for individually housed pigs. However, pigs in commercial conditions are usually housed in groups and allowed ad-libitum feed …
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The effect of selection for milk yield on net energy balance and plasma concentrations of endogenous hormones and metabolites in primiparous Holsteins
The effect of genetic selection for milk yield on lactation yield, net energy balance (NEB) and on plasma growth hormone (GH), insulin (INS), prolactin (PRL), nonesterified fatty acids (NEFA) and glucose was studied in primiparous Holstein cows. Net energy balance was calculated and serial blood …
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Dietary energy utilization in swine
Of the available dietary energy systems, the net energy system provides a more accurate estimate of dietary energy compared to digestible and metabolizable energy systems although net energy values of ingredients and diets are affected by several factors including nutrient composition of basal …
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Biomass to ethanol : potential production and environmental impacts
… geographic arenas. This results in a range of energy and greenhouse gas impacts rather than previous single-valued estimates. This uncertainty analysis brings greater clarity to the ethanol debate through evaluating the probability of previously published life-cycle assessment net energy …
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Development of an Efficient Solar Powered Unmanned Aerial Vehicle with an Onboard Solar Tracker
… of tracking the sun to achieve maximum solar energy capture. A single-axis solar tracking system was designed and constructed. This system autonomously rotated an onboard solar panel to find the angle of maximum solar irradiance while the UAV was airborne. A microcontroller was programmed and …
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Life cycle analysis of hybrid poplar trees for cellulosic ethanol
The main purpose of this paper is to assess the energy and environmental benefits of cultivating hybrid poplars as a biomass crop for cellulosic ethanol. A "Life Cycle Assessment" (LCA) methodology is used to systematically evaluate the hybrid poplar's energy input and output as well as greenhouse …
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Cost-benefit analysis of a Building Integrated Photovolatic roofing system for a school located in Blacksburg, Virginia
… and environmental degradation as a result of energy consumption in buildings. Buildings account for approximately one-half of the total energy consumption in developed countries. As architects and engineers involved with the fast growing building industry, we have the responsibility of …
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Improving bioenergy recovery from municipal wastewater with a novel cloth-filter anaerobic membrane bioreactor
… dioxide (CO2), which is a double negative for energy efficiency. It dissipates the organic energy content of wastewater and requires substantial energy input for aeration. Anaerobic membrane bioreactors (AnMBRs) have been proposed as a more sustainable approach than CAS to manage the organics …
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Variables Affecting Gas Production in Mesophilic Anaerobic Digestion
… into the factors which influence the net gas production in mesophilic anaerobic digesters. The major variables were examined during a six year period using equipment specially designed for the purpose. Continuous operation of these pilot plants over many months produced results which …
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Virtual Inertia Emulation to Improve Dynamic Frequency Stability of Low Inertia Microgrids
… amount of photovoltaic systems that can be penetrated in the microgrid. In order to increase the penetration of photovoltaic systems, the dynamic frequency controller, that is faster than the primary frequency controller (governor control) needs to be added in the microgrid system. For dynamic …
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Hydrothermal processes to recover energy and nutrients from liquid portion of swine manure
… has been proposed in Environment-Enhancing Energy (E2-Energy) lab. This study aimed at evaluating the feasibility of recovering the energy and nutrients from the liquid portion of animal manure (LPAM), via physical and biological concentration and hydrothermal processes. First, LPAM was …
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Dynamics of Self -Organization of Ramified Patterns in an Electromechanical System
… known to forage along ramified trunk trail networks. We show that the structure of these foraging patterns has consequences on the net energy collection rate of the ant colony. From this, we predict that there should exist both an optimal and maximal colony size.
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Nitrogen balance and nutrient requirements of young Nellore bulls fed with static or oscillating crude protein levels, and feeding behavior, water intake and requirements of bulls with different residual feed intakes
… protein feeds. Regarding requirements, the net energy requirements for maintenance and metabolizable energy (ME) for maintenance were 77 and 122.75 Kcal/EBW0.75/d, respectively. The efficiency of ME utilization for maintenance was 62.7%. The equation obtained for net energy for gain (NEg) …
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ON THE CONTROL OF OPEN QUANTUM BATTERIES
… systems. In the third study we analyze the energy discharging from a quantum battery through a non-ideal quantum non-demolition (QND) energy measurement protocol, both in terms of work extracted and in terms of net energy balance, quantifying trade-offs between work gain and measurement …
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Integrating bioenergetics and foraging behavior : the physiological ecology of larval cod (Gadus morhua)
… was modeled as a power-performance relationship (energy expenditure as a function of swimming speed) and as the cost of transport (the cost to travel a given distance). The cost of transport was high relative to juvenile and adult fish, but larvae swam more efficiently as they grew and became …
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Predictive equations for milk yield and dry matter intake and development of a maximum-profit ration formulation model
… the ration, and the variation of crude fiber and net energy within a ration. A procedure was developed to adjust net energy values for rate of intake, thus compensating for declining digestibility as intake rate increased. Least-square equations were developed to provide quantitative estimates of …
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Integrated Energy and Environmental Analysis of Utility-Scale Wind Power Production
… wind at that scale. The Maple Ridge Wind Energy Facility was identified as the target for analysis. Emergy analysis was performed to explore the total environmental and economic impact of the facility in common units; Energy Return on Energy Investment (EROI) was quantified to explore the …
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Effects of Prescribed Fire Regimes on White-tailed Deer (Odocoileus virginianus) Browse, Forage, and Nutrient Availability in the Pineywoods Ecoregion of Texas
… magnesium, and potassium. Crude protein, net energy for maintenance, field dressed weight, fawn to doe ratios, deer density, and preferred herbaceous biomass were generally higher with a more frequent burn regime. For achieving desired white-tailed deer long-term management results, …
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