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 41 for “"EGS"”.
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Effects of thermally-induced fractures on EGS performance
An Enhanced (or Engineered) Geothermal System (EGS) is defined as an engineered reservoir formed by hydro-fracturing hot dry rock to extract heat from low permeability geothermal resources to generate electricity. EGS technology is undergoing stages of advancement, and a substantial amount of …
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Nitrous oxide as working fluid in enhanced geothermal systems (EGS)
… el mundo. Los sistemas geotérmicos mejorados (EGS), representan un camino para convertir los enormes recursos proporcionados por la energía geotérmica, en electricidad para el consumo humano de manera eficiente y a gran escala. Inicialmente, se presenta una descripción general de esta …
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Numerical analyses of the long term behavior of enhanced geothermal system (EGS)
Enhanced Geothermal System (EGS) technology is a challenging extrapolation of conventional hydrothermal geothermal systems but expected to significantly contribute to U.S. energy in near future. This technology is still going through a steep learning phase and current research studies are mostly …
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Essential Genes And Their Role In Autism Spectrum Disorder
Essential genes (EGs) play central roles in fundamental cellular processes and are required for the survival of an organism. EGs are enriched for human disease genes and are under strong purifying selection. This intolerance to deleterious mutations, commonly observed haploinsufficiency and the …
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Long-term Outcomes Following Emergency General Surgery in Older Adults
Introduction: Emergency general surgery (EGS) conditions represent a large and growing burden for patients and healthcare systems alike, particularly among older adults (age ≥ 65). While the short-term risks of EGS among older adults have been studied, little is known about long-term functional …
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Design and implementation of evolutionary computation algorithms for volunteer compute networks
… computation system titled EvoGPJ Star (EGS) and deployed the system onto Boinc, a volunteer computing network (VCN). Evolutionary computation is computationally expensive and VCN allows more cost-effective cluster computing since resources are donated. In addition, we believe that the …
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Investigation into the effect of wind power based embedded generators on distribution networks.
… are commonly known as "Embedded Generators" (EGs). Recently, it has been reported that the integration of wind power-based embedded generators (WPBEGs) into distribution networks could cause maloperation of automatic voltage control (AVC) relays. Further investigation is therefore required to …
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Impact of the Acute Surgical Unit on a Local and Global Scale
… commitments, with emergency general surgical (EGS) patients managed ad-hoc. An acute surgical unit (ASU) model was pioneered in 1996 and spread globally. However, uptake remains slow, in part due to clinical equipoise. This thesis aims to address key gaps in the literature, to support hospitals …
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Elastomeric grating sensor for multifunctional optofluidic biosensing
… The Multifunctional Elastomeric Grating Sensor (EGS) presented in this thesis is fabricated using elastomeric materials. The EGS is made by integrating a two-dimensional (2D) diffraction grating inside a hemispherical chamber. The sensing mechanism of the EGS is based on the diffraction of light. …
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A Comparative Case Study of Enhanced Geothermal Systems: Interacting Imaginaries of Place and Energy in Renewable Energy Transitions
… technology known as Enhanced Geothermal Systems (EGS) to examine how multi-scalar imaginaries of energy and place interact and compete within a local context to shape public negotiations of acceptability. Further, I examine how communication strategies that draw on place-based visions of energy …
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South Africa's trade in environmental goods: investigating bilateral potential exports to select developed and emerging countries (2007 to 2013)
… by international trade in environmental goods (EGs) as a means to deal with the environmental pressures associated with climate change. Trade liberalization in EGs plays an important role in the diffusion of cost effective environmental goods and services, thus advancing global climate change …
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Numerical Model Studies of Enhanced Geothermal Systems
Enhanced Geothermal Systems (EGS) are being developed around the world as a method of extraction of thermal energy. A good EGS reservoir should maintain a small thermal drawdown and low water loss. All factors must be considered for optimal levels of energy production and assuring a long life span …
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Thermomechanical analysis of rock asperity in fractures of enhanced geothermal systems
<p>"Enhanced Geothermal Systems (EGS) offer great potential for dramatically expanding the use of geothermal energy and become a promising supplement for fossil energy. The EGS is to extract heat by creating a subsurface system to which cold water can be added through injection wells. Injected …
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Acoustic monitoring of hydraulic stimulation in granites
Enhanced Geothermal Systems (EGS) have substantial potential as a domestic energy source and is well suited as an alternative to diversify the national energy portfolio due to its high levels of heat and recoverable energy. Hydraulic fracture stimulation of low permeability EGS reservoir rock is …
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Hydrothermal spallation drilling and advanced energy conversion technologies for Engineered Geothermal Systems
… and analysis of the technologies used to develop EGS projects. Since the cost of completing wells is a major factor in determining the economic feasibility of EGS projects, it is vital to be able to accurately predict in determining the economic feasibility of EGS projects, it is vital to be able …
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Numerical study of downhole heat exchanger concept in geothermal energy extraction from saturated and fractured reservoirs
… and enhanced/engineered geothermal systems (EGS). Modeling of DHE is based on the concept of thermal resistance. A geothermal reservoir simulator is built reusing components of an existing blackoil simulator by adding thermal energy transport equations and fracture representation (discrete …
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Understanding the Relationship between Hydraulic Properties of Rocks and Induced Seismicity in the Stimulation of Enhanced Geothermal Systems
… to gain insight on Enhanced Geothermal System (EGS) stimulation operations. These operations consist of high pressure injection of cold water in low permeability formations at depth of 2-4 kilometres, promoting the opening of existing fractures and creating an artificial geothermal reservoir. …
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Interplay of porous media and fracture stimulation in sedimentary enhanced geothermal systems : Red River Formation, Williston Basin, North Dakota
Fracture stimulated enhanced geothermal systems (EGS) can be installed in both crystalline rocks and sedimentary basins. The Red River Formation (Ordovician), which lies between 3.6 and 4.2 km depth in the Williston Basin, is a viable site for installation of sedimentary EGS (SEGS). SEGS is …
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ENERGY MICROPILES AND THERMO-ACTIVE FOUNDATIONS: EXPERIMENTAL INVESTIGATION, NUMERICAL MODELLING, AND EMERGING APPLICATIONS
… behaviour of innovative Energy Geostructures (EGs), specifically focusing on energy micropiles (EMPs) and large-diameter energy piles (EPs) under extreme, large-scale, and non-conventional operational conditions. EGs serve a dual purpose: providing structural stability to buildings or …
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Numerical and analytical modeling of heat transfer between fluid and fractured rocks
… importance for energy extraction analysis in EGS, and therefore represents a critical component of EGS design and performance evaluation. In conventional fracture dominated geothermal systems with reinjection, this modeling process is also helpful for understanding how the thermal front …
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