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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 1507 for “"wells"”.
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Optimizing oil production in horizontal wells (water/oil cresting in horizontal wells)
In recent years, the application of horizontal wells has been predominant in minimizing cresting scenarios due to significant reservoir exposure of its laterals. Cresting is known to occur in horizontal wells when the pressure drop supersedes the hydrostatic pressure existing between the phases in …
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Sun polarised dynamics in quantum wells
… I InxGa1-xAs/GaAs single and multiple quantum wells.<br/><br/>The electron, hole and excitonic effective Lande g-factors have been measured as a function of quantum well thickness in GaAs/Al0.36Ga0.64As and In0.11Ga0.89As/GaAs. For the GaAs/AlGaAs wells, we observed a change in sign of the …
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Carrier relaxation in doped quantum wells
The relaxation time of an electron in a quantum well is derived within the random-phase approximation including full multi-subband and frequency dependent screening. The resulting expression encompasses both electron-electron and electron-phonon scattering taking into account the mutual …
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MULTICOLOR INFRARED DETECTION USING STEP QUANTUM WELLS
… quantum well structure based on step quantum wells and superlattice batTiers. In order to study the subband structure and the intersubband transition in arbitrary shape quantum wells, a transfer matrix method with effective mass approximation has been constructed. The energy states and …
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Geochemistry of ferruginous clogging of Karoo wells
… of screens, pumps and filter packs in supply wells is a worldwide problem and the consequences can be severe, leading to costly and harsh rehabilitation measures or even loss of the well. A study was undertaken in order to determine the chemistry and morphology of the precipitates found in …
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H. G. Wells: Prophet With Honor (Britain)
Critics and biographers of H. G. Wells have commonly disregarded his journalism and much of is nonfiction. After the Edwardian period Wells's reputation as a novelist began to deteriorate. He continued to produce novels, but he turned more to the writing of journalism and nonfiction. Dismissed as …
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Occurrence and Growth Characteristics of Algae Isolated From Shallow Wells, Deep Wells, and Springs in Northwest Arkansas and Southwest Missouri
Water samples obtained from wells and springs in Greene County, near Springfield, Missouri, and in Carroll County, near Green Forest, Arkansas, areas were obtained and examined for the presence of algae. Algae were found to be present in twenty-three of the thirty-six sampled wells and springs; …
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Magneto - optical studies of quantum wells and superlattices
Contains fulltext : mmubn000001_028979664.pdf (Publisher’s version ) (Open Access)
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The geology of eastern Wells County, North Dakota
… responsible for the varied landforms of eastern Wells County. The Burnstad-Streeter phase advanced from the north-northeast about 10,000 to 12,000 years ago and was obstructed by the elevated Missouri Coteau which caused basal shearing and subsequent movement of subglacial drift into the ice. As …
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Glacial geology of western Wells County, North Dakota
<p>The landforms of western Wells County were formed during late Wisconsinan glacial activity. Because of the relatively dry climate they have been modified only slightly by post-glacial erosion and mass wasting.</p> <p>The southern one-third of the area is characterized by randomly-oriented mounds …
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The life and novels of H. G. Wells
… in all of the novels the main interest, both to Wells and to the Reader, lies in the matter of theme. I have discussed the novels, therefore, in such a way as to make clear the nature of the themes, and to show how Wells has presented them. In doing the latter, I have considered some matters of …
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Performance evaluation of multiple wells in closed systems
Includes bibliographical references (pages 67-70).
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Electronic and optical properties of semiconductor quantum wells
… properties of GaAs-AlGaAs semiconductors quantum wells. The light and heavy hole subbands are strongly hybridized and this subband mixing has important effects on electronic and optical properties. A systematic study of the mixing effects on valence subband structure, exciton binding energies and …
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Survey of Groundwater Wells in the United States
Groundwater wells are critical infrastructure with significant impacts on the environment, water availability, and economy. However, comprehensive data on the purposes, locations, depths, and construction of these wells are only collected by individual states. We have compiled a nationwide dataset …
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Conversion of oil and gas wells to geothermal reinjection
Number of old, disused and abandoned oil wells around the globe is counted in millions. If just a small fraction could be converted for geothermal utilization, it could significantly reduce costs and environmental impact compared to making new wells from scratch. The focus of this project is …
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The Capital Sculpture of Wells Cathedral, c. 1184-1210
The understudied capital sculpture of Wells Cathedral in Somerset, England (c. 1184-1210) provides ample opportunity of expanding the current scholarship and understanding of interior ecclesiastical sculpture in a West Country cathedral. While the Gothic style of architecture is typically …
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Automatic type curve matching for predicting gas wells production
The determination of gas wells production using type curve matching is one of the methods used in evaluating gas reservoirs. Matching curves manually is time consuming and exposed to human error. Aminian type curves unlike the other type curves accounts the pressure dependency of gas properties and …
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Pressure- and rate-transient model for interfering horizontal wells
Multiple fractured horizontal wells (MFHW) are extensively used to enhance hydrocarbon production from ultra-tight unconventional reservoirs by increasing surface area for fluid flow. Hydraulic fracturing creates or rejuvenates the existing network of fractures surrounding the hydraulic fractures …
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