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 25 for “"Plumbing system"”.
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Microanalytical Constraints on the Geometry and Chemical Evolution of Kīlauea’s Volcanic Plumbing System
… paradigm shift in our understanding of volcanic plumbing systems, moving away from a model where large vats of melt are stored in the crust, to a model dominated by extensive piles of settled crystals. This thesis examines the petrological evidence for this ‘mush-dominated’ model at Kīlauea …
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INSIGHTS INTO ERUPTION DYNAMICS AND SHALLOW PLUMBING SYSTEM OF MT. ETNA BY INFRASOUND AND SEISMIC SIGNALS
… the knowledge of the eruptive processes and the plumbing system of the volcano. Indeed, the eruptive styles are controlled by the interplay between magma dynamics and the plumbing system. In multi-vent volcanoes, such as Mt. Etna, where volcanic activity can rapidly vary over time and be …
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An unexpected journey: experimental insights into magma and volatile transport beneath Erebus volcano, Antarctica
… of studies on various aspects of the Erebus system, such as physical volcanology, gas chemistry, petrology, melt inclusion research, seismic, and more. Despite this large data set, however, interpretations of Erebus rocks, particularly mafic and intermediate lavas, which are thought to …
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Documenting Magnatic Processes at Filicudi Island, Aeolian Arc, Italy: Integrating Quantitative Modeling and Plagioclase Textural and in situ Compositional Data
… evolution and elucidates aspects of the magma plumbing system structure.</p> <p>Results indicate a polybaric magma plumbing system with deeper (3.5-4 kilobars) and shallower (0.5-1.2 kilobars) storage regions. Within the deeper system, FC acted to differentiate magma, while water contents acted …
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Two Issues in Premise Plumbing: Contamination Intrusion at Service Line and Choosing Alternative Plumbing Material
Worldwide water distribution infrastructure system is old and deteriorating. A water system with its myriad appurtenances (including pumps and valves and tanks) is susceptible to hydraulic transients resulting in high and low pressure waves alternatively passing through the network. While both low …
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Investigating Volcano-Tectonic Interactions in the Natron Rift, East Africa with Implications for Understanding Volcanic Eruptive Processes
… associated with observed changes in the volcanic plumbing system of the active volcano Ol Doinyo Lengai. The Natron Rift is a magma-rich rift in the southern segment of the Eastern Branch in northern Tanzania providing an ideal setting to explore the interactions between tectonic and magmatic …
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Decision Support Tool for Optimal Replacement of Plumbing Systems
Pinhole corrosion leak in home plumbing has emerged as a significant issue. In the major water distribution system managed by municipalities and water utilities the costs are distributed among all subscribers. The home plumbing repair/replacement cost and possible water damage cost must be …
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Magmatic processes at basaltic volcanoes: insights from the crystal cargo
… to eruption. Magma reservoirs are complex, open systems, and often multiple reservoirs are partially inter-connected from source to surface, giving rise to the term 'volcanic plumbing system'. Parental melts feeding these reservoirs can have diverse and distinct geochemical and petrological …
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TEMPORAL AND SPATIAL VARIATIONS IN THE GEOCHEMISTRY AND MINERAOLOGY OF THE YOUNGER HISTORIC LAVAS OF MOUNT ETNA, SICILY
… of intermittent, rapid pulses to the high-level plumbing system. The high-level central conduit and radial dyke systems are charged with older, residual magmas of contrasting trace element chemistry. Ascending new magma entering this region mixes with the older magma in the central conduit and/or …
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Seismic Tomography at Volcanic Rift Zones and Transpressional Plate Boundaries Askja Caldera and Macquarie Island
… also performed to further explore the magmatic plumbing system beneath Askja. The results of the tomographic study reveal the presence of a cylindrical low-velocity and high Vp/Vs (P-wave velocity divided by S-wave velocity) zone beneath Askja caldera that is ∼3 km wide and extends to ∼8 km …
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A Framework for Controlling Opportunistic Pathogens in Premise Plumbing Considerate of Disinfectant Concentration x Time (CT) and Shifts in Microbial Growth Phase
… can naturally colonize premise (i.e., building) plumbing and are the leading cause of disease associated with potable water in the U.S. and many other countries. While secondary disinfectant is added by utilities prior to water distribution through pipes, the residual in water at the property …
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Using linear inverse methods and finite element models to explore sensitivity to homogeneous elastic half-space assumptions in deformation models of the 2000 eruption of Hekla volcano, Iceland
… eruption. These results can help elucidate the plumbing system of a volcano, including the relationship between processes in the magma chamber and in the conduit during an eruption. This can help geologists, volcanologists, and hazard assessment teams assemble more accurate eruption forecasts.
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Role of disinfectants and pipe materials on bacterial adhesion onto biofilms
… aeruginosa and Legionella pneumophila in premise plumbing system. The fact that biofilms can protect attached bacterial cells from disinfectants raises rudimentary questions regarding interactions of bacterial cells with biofilm surfaces. Consequently, the main objectives of this study were to: 1) …
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Investigation on Mt. Etna dynamics by seismic and acoustic signals (August 2007-December 2010)
In order to shed light on the dynamics of the plumbing system, and define the source-mechanism of acoustic events at Mt. Etna, infrasound signals-continuously recorded by Istituto Nazionale di Geofisica and Vulcanologia- were analyzed in this thesis, jointly with some seismic signals. In …
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Interplay of Water Chemistry and Entrained Particulates in Erosion Corrosion of Copper and Nonleaded Alloys in Potable Water Systems
Erosion corrosion of plumbing materials in domestic water systems is a complex phenomenon driven by water quality, hydrodynamic and electrochemical factors. Erosion corrosion accounts for over a third of copper hot water system failures in the U.S., hundreds of millions in damage, and may be …
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Lead and Copper Corrosion Control in New Construction: Shock Chlorination, Flushing to Remove Debris & In-line Device Product Testing
Several aesthetic, health, and plumbing quality issues can arise during new construction or renovation of premise plumbing. There has been little research done on many of these concerns and therefore few guidelines or regulations are in place to protect the health of the consumer or the integrity …
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Segnali infrasonici e dinamica del magma al Mt. Etna: analisi acustica e multiparametrica per lo studio del sistema di alimentazione superficiale
… che avvengono nelle porzioni sommitali del plumbing system. Per questo motivo sono stati analizzati sia i segnali infrasonici prodotti durante 51 episodi di fontane di lava avvenuti tra il 2011 e il 2015, sia il particolare fenomeno di gliding infrasonico registrato tra maggio e giugno 2022. …
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MAGMA STORAGE, ASCENT AND DEGASSING HISTORIES TRACED BY TEXTURES AND CHEMICAL ZONING IN CRYSTALS: APPLICATION TO THE CO2-RICH BASALTIC SYSTEM OF MT. ETNA VOLCANO
… ha rivelato la presenza all interno del feeding system Etneo di volumi magmatici a basso contenuto in Sr, i quali preservano una signature geochimica simile a quella dei prodotti che hanno alimentato l attivita storica, pre-1971, dell Etna. L analisi della zonatura di Fe e Mg rispetto all …
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Evaluating mantle and crustal processes using isotope geochemistry
… and mantle processes. This study presents Re-Os systematics to constrain the composition, formation and age of the lower continental crust and the mantle lithosphere, examines melt inclusion from oceanic island basalts to evaluate the scale of the mantle heterogeneities, and uses U-series isotope …
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Seismic anisotropy and microseismicity: from crustal formation to subduction termination
… accreted at a mid-ocean ridge, and the volcanic systems found therein, in Iceland. I also look to piece together the interplay between past tectonic events, subduction termination, and the present-day state of the mantle in northern Borneo. In the first part of my dissertation, I apply shear-wave …
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