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Dissertations / Theses on the topic 'Flowpaths'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Tran, Kathleen. "One Dimensional Analysis Program for Scramjet and Ramjet Flowpaths." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/30857.

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One-Dimensional modeling of dual mode scramjet and ramjet flowpaths is a useful tool for scramjet conceptual design and wind tunnel testing. In this thesis, modeling tools that enable detailed analysis of the flow physics within the combustor are developed as part of a new one-dimensional MATLAB-based model named VTMODEL. VTMODEL divides a ramjet or scramjet flow path into four major components: inlet, isolator, combustor, and nozzle. The inlet module provides two options for supersonic inlet one-dimensional calculations; a correlation from MIL Spec 5007D, and a kinetic energy efficiency corre

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2

Woocay-Prieto, Arturo. "Groundwater hydrochemical facies, flowpaths and recharge determined by multivariate statistical, isotopic and chloride mass-balance methods." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2008. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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3

Hill, Kenneth Randall. "Potential climate impacts on hydrochemistry, source waters, and flowpaths in two alpine catchments, Green Lakes Valley, Colorado." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1456677.

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4

Reisch, Chad Edward. "Using stormwater hysteresis to characterize variations in quick and diffuse flowpaths within a conduit dominated karst spring." Master's thesis, Temple University Libraries, 2010. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/103106.

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Geology<br>M.S.<br>Groundwater quality in karst systems is difficult to monitor because the extreme heterogeneity within the recharge area and complex subsurface flow network makes flowpaths and travel rates difficult to predict. Understanding how flowpaths vary during storm events is important because water transmitted through conduit flowpaths can travel fast, may come from long distances, and has little filtration of contaminants. The hypothesis tested in this project is that ion ratios in spring discharge will show the timing of changes from diffuse to quick flow depending on storm intensi

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5

Bates, Brittney Lynette. "The Influence of Groundwater Flowpaths, Nutrients, and Redox Conditions on the Extent of Microbial Methanogenesis in Coal Beds Using Solute and Isotope Chemistry: Powder River Basin, USA." Thesis, The University of Arizona, 2010. http://hdl.handle.net/10150/193411.

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Water and gas samples were collected from coalbed methane wells and surface coal mines in the Powder River Basin and analyzed for solute chemistry, isotopes, and gas composition to determine timing and source of recharge, nutrient influxes, extent of methanogenesis, and redox conditions. Delta18O-H2O values and hydraulic gradients show recharge to coal beds is principally from the southern basin margin with inputs from the western and eastern margins. Detectable 14C in coal waters indicates they were recharged <50,000 BP. Correlation of deltaD-CH4 and deltaD-H2O values suggests that methane

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6

Cordner, Cameron Patrick. "Localized Anthropogenic and Geogenic Groundwater Contamination in the Structurally Complex Carbonate-Hosted East Tintic Mining District, Eureka, UT, USA." BYU ScholarsArchive, 2021. https://scholarsarchive.byu.edu/etd/9040.

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Legacy mining areas throughout the world contain widespread contaminated surface and groundwater from both anthropogenic and geogenic sources. Abandoned mine waste can contribute harmful solutes to groundwater and surface water, as metals mobilize through oxidation of sulfide minerals. Geogenic contaminant sources, such as geothermal water and mineralization, may also contribute to groundwater pollution in mining areas. To investigate the relationship between various groundwater contamination sources in legacy mining areas we sampled ~30 cold springs in the East Tintic Mountains of Utah and 8

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7

Hale, Colin Andrus. "Strontium Isotopes-A Tracer for Dust and Flow Processes in an Alpine Catchment." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7459.

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Stream chemistry changes in response to snowmelt, but does not typically reflect thechemistry of the snowpack. This suggests that flow processes between snowmelt and streamsystem, such as interactions with the soil and bedrock, have an important control on waterchemistry and highlight the complex flow pathways from the snowpack to stream. To investigateflow processes in the upper Provo River watershed, northern Utah, we sampled three sites on theriver ~20 times per year during 2016 and 2017. The sites, from highest elevations to lowest wereSoapstone, Woodland, and Hailstone, corresponding to l

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8

Neto, Sérgio Candido de Gouveia. "\"Concentrações e balanços de carbono orgânico dissolvido em duas bacias do Estado de Rondônia: uma comparação entre floresta e pastagem\"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/64/64132/tde-04102006-192006/.

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O Carbono Orgânico Dissolvido (COD) constitui em uma das principais formas de carbono orgânico exportado em rios e em outras vias hidrológicas preferencias nas bacias de drenagem. Na Amazônia, os estudos sobre o COD nas suas águas abrangem principalmente as grandes bacias da região central, com poucas análises sobre alterações na sua dinâmica após a substituição de florestas por pastagens, uma das mudanças no uso da terra mais comum na região. Este estudo objetivou fornecer informações que auxiliem na compreensão destes processos, através da comparação entre as dinâmicas das concentrações nas

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9

Larios-Barbosa, Jaime Omar. "SHOCK CORRELATION INVESTIGATION IN A GASEOUS FUELED AXISYMMETRIC SCRAMJET FLOWPATH." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1377130377.

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10

Zittere, Benjamin D. "Flowpath design of a three-tube valve-less pulse detonation combustor." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FZittere.pdf.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, September 2009.<br>Thesis Advisor(s): Sinibaldi, Jose. "September 2009." Description based on title screen as viewed on November 6, 2009. Author(s) subject terms: PDE Pulse Detonation Engine Side Dump Combustor Recirculation Zone. Includes bibliographical references (p. 51). Also available in print.

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11

Leite, Nei Kavaguichi. "Fluxo de nutrientes em um fragmento de mata ciliar no estado de Rondônia, Brasil." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/64/64135/tde-22032012-151049/.

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Para identificar a importância ecológica das matas ciliares é essencial conhecer a interação entre sua hidrologia e ciclagem de nutrientes. Isto se torna ainda mais crucial diante das crescentes transformações na paisagem causadas pelo homem, que têm promovido forte antropização destas formações florestais. O estudo foi conduzido em uma floresta ribeirinha sazonalmente alagada na região sudoeste da Amazônia entre os anos de 2005 e 2007. Foram medidas as principais vias hidrológicas: chuva, precipitação interna, escoamento pelo tronco, escoamento superficial, solução do solo e água subterrânea,

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12

Correa, Barahona Alicia Beatriz [Verfasser]. "Runoff sources and flowpath dynamics in the Andean Páramo / Alicia Beatriz Correa Barahona." Gießen : Universitätsbibliothek, 2017. http://d-nb.info/1147680604/34.

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13

Ross, KellyAnn. "Microbial characterization and biogeochemical cycling of iron in a creosote contaminated aquifer along a groundwater flowpath." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/32317.

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Natural attenuation of a contaminant plume in an aquifer is an attractive clean up option that eliminates the expense of engineering processes. A creosote-contaminated aquifer located beneath the Fraser River at Braid Street in New Westminster BC was characterized to deduce the presence of natural attenuation. A geochemical and microbial characterization of the contaminated aquifer was conducted to infer biogeochemical processes. Geochemical analysis of the pore water and the corresponding sediment-bacterial community characterization, via the small subunit 16S rRNA, were implemented to elucid

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14

Moragues, Quiroga Cristina. "Water mixing processes in the critical zone : evidence from trace elements and Sr-Nd-Pb-U isotopes." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAH002.

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Les fonctions hydrologiques de captage, stockage et rejet d’eau ont des signatures géochimiques dans les cours d'eau reflétant énormément celles trouvées dans les compartiments de la zone critique. Ces signatures sont fortement contrôlées par des processus bio-géophysico-chimiques produits dans l'interface régolite-plante. Jusqu'à présent, les recherches sur régolithes et processus hydrologiques sont restées largement découplées - conduisant à une utilisation généralisée de traceurs non conservateurs d'origines multiples, bloquant ainsi notre capacité à identifier les sources et les voies d'éc

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15

Germer, Sonja. "Near-surface hydrology and hydrochemistry under contrasting land-cover." Phd thesis, Universität Potsdam, 2008. http://opus.kobv.de/ubp/volltexte/2008/1904/.

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Human transformation of the Earth’s land surface has far-reaching and important consequences for the functioning of hydrological and hydrochemical processes in watersheds. In nowadays land-use change from forest to pasture is a major issue in particular in the tropics. A sustainable management of deforested areas requires an in-depth understanding of the water and nutrient cycle. On this basis we compared the involved hydrological pathways for rainfall to reach streams and the nutrient budgets of a tropical rainforest and a pasture. In addition we studied the links of hydrochemical differences

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16

Ben, Maamar Sarah. "Biodiversité des eaux souterraines dans un gradient de temps de résidence et d'influence anthropique : approches métagénomique et géochimique couplées." Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S108/document.

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Les aquifères de socle fracturés très répandus en Bretagne, constituent des formations géologiques hétérogènes renfermant des ressources en eau. Ces structures sont souvent constituées d'une zone altérée et d'une zone fracturée. La zone altérée est peu épaisse et proche de la surface, elle est constituée de roches altérées envahies par l'eau souterraine qui y circule rapidement des hauts topographiques du bassin versant vers l'exutoire. L'eau y présente des temps de résidence courts (<20 ans) et est souvent polluée par les nitrates. La zone altérée située plus en profondeur et plus épaisse

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17

Gardner, Christopher Brent. "Rock-Derived Micronutrient Transport across Landscape Units: Hydrologic Flow Path Analysis and Catchment-Scale Transport in the Tropics and Small Mountainous Rivers." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449157172.

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18

Fitzpatrick, John Nathan. "Coupled thermal-fluid analysis with flowpath-cavity interaction in a gas turbine engine." Thesis, 2013. http://hdl.handle.net/1805/4441.

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Indiana University-Purdue University Indianapolis (IUPUI)<br>This study seeks to improve the understanding of inlet conditions of a large rotor-stator cavity in a turbofan engine, often referred to as the drive cone cavity (DCC). The inlet flow is better understood through a higher fidelity computational fluid dynamics (CFD) modeling of the inlet to the cavity, and a coupled finite element (FE) thermal to CFD fluid analysis of the cavity in order to accurately predict engine component temperatures. Accurately predicting temperature distribution in the cavity is important because temperatures d

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