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 26 for “"water and gas"”.
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Einfluss des Wassersprays auf die Ablation von Zahnschmelz mit dem Er,Cr:YSGG-Laser
… thesis was to examine the influence of external water spray occurring with the application of Er,Cr:YSGG laser on ablation of dental enamel. For this purpose, the combined dose of water and gas was defined and varied in order to gain a maximum of substance ablation avoiding any thermal damage of …
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Análise paramétrica do método de injeção alternada de água e CO2(WAG) em reservatórios de petróleo
… processes such as chemical injection, miscible gases, thermal and others can be applied. The advanced recovery method with alternating - CO2 injection WAG uses the injection of water and gas, normally miscible that will come in contact with the stock oil. In Brazil with the discovery of pre-salt …
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Simulation and Analysis of Energy Consumption for Two Complex and Energy intensive Buildings on UMD Campus
The Physical Sciences Complex and Eppley Recreational Center are multi-purpose buildings which are complex in functionality and are among the highest consumers of energy on the UMD campus. Building energy analyses used to identify energy efficiency measures to optimize energy efficiency in the …
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Experimental and Simulation Study of Relative Permeabilities in Heavy Oil/Water/Gas Systems
… behaviour of a typical Canadian bitumen, water and gas. Series of isothermal core flood experiments were conducted on an unconsolidated core composed of cleaned Athabasca sand matrix and relative permeabilities of the involved phases were determined. Athabasca bitumen was used as the oil …
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Towards a triphasic Theory of Porous Media-based model for chloride-induced corrosion in reinforced concrete
… for discrepancies between experimental data and model results. The model presented may be used to simulate the transport of water and gas through the capillary pores in concrete and the diffusion of iron III chloride within the pore solution. Iron III chloride is a soluble chloride complex …
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Investigating the pH of atmospheric fine particles and implications for atmospheric chemistry
… quantity that affects many aerosol processes and properties, including aerosol composition and toxicity. In this study, particle pH and water (which affects pH) are predicted using a thermodynamic model and measurements of RH, T, and inorganic gas and particle species. The method was first …
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Single Well Completion and Management Strategies for Enhanced Recovery of Tight Oil Using Miscible Gas Injection
… US. Attempts at well to well displacement using water and gas as injection fluid failed in tight oil largely due to short-circuits along fractures connecting adjacent injection and production wells. As an alternative, operators have tried alternating miscible gas injection with production in a …
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Drying Oils Treated by Irradiation as Coatings for Biobased Films
… However, their performance with respect to water and gas barrier properties is inferior to current packaging products on market. Drying oils are promising as film coatings to improve water barrier properties of protein-based films. Drying oils undergo autoxidation after a period exposure to …
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Process-level Anomaly Detection in Industrial Control Systems
… manage critical infrastructure such as power, water and gas distribution systems, are increasingly being targeted by sophisticated cyberattacks. It is of paramount importance that necessary safeguards are in place for these systems to avoid potentially catastrophic damage. Intrusion Detection …
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Online Electromagnetic Wave Monitoring System for Petroleum Industry Applications
The general demand for automating industrial processes in the oil industry has increased rapidly in parallel with sensors and their underlying technology. Since the early 1980s, the particular problem, which has been representing the extremes in complexity in the oil industry, is the measurement of …
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Condition assessment of polyethylene pipeline systems
… is an industrial project commissioned by British Gas plc. (UK) to investigate the state of in-service naturally aged polyethylene (PE) buried pipes and to define procedures or techniques available to facilitate the condition assessment programme of PE pipelines systems. The primary goal of this …
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The effect of gas on multi-stage mixed-flow centrifugal pumps
… an oil reservoir is a mixture of liquids (oil and water) and gas, and is often maintained by using a pump placed in the well to ensure a continuous flow to the surface. Electrical Submersible Pumps consist of stacked centrifugal pump stages, each comprising a bladed impeller (rotating part) and …
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A scale model study of displacement ventilation with chilled ceilings
… air-conditioning which provides good air quality and some energy savings. The air quality is better than for a conventional mixed ventilation system. The maximum amount of cooling that displacement ventilation can provide whilst maintaining a comfortable space is between 25 and 40 W/m2. Chilled …
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Butt fusion welding of polyethylene pipes
… in the joining of polyethylene (PE) pipes by the water and gas industries. This welding process although deceptively simple, is rather poorly understood, with much of the initial developments being of a rather empirical nature. The Water Research centre (WRc) have funded the present research in an …
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Heavy oil recovery by combined solvent and hot water (CS-HW) injection: Experimental, numerical and data mining-based analysis
In this study, a hybrid EOR process is developed and optimized in a two-well configuration for heavy-oil recovery which combines solvent injection using different solvents such as carbon dioxide (CO2), methane (CH4) and propane (C3H8) with a moderate reservoir heating by hot-water flooding (HWF) as …
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Development of formation damage models for oilfield polymers.
… the most important of various oilfield chemicals and are used for a variety of applications in the oil and gas industry (OGI), including: water and gas shutoff; drilling mud viscosity modification; filtration loss control (FLC); swellable packers; loss circulation material (LCM) pills; enhanced …
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Catalytic Pyrolysis of Cellulose, Hemicellulose and Lignin Model Compounds
The effect of HZSM-5 catalyst and NaOH pretreatment on the product distribution and bio oil properties from pyrolysis of cellulose, hemicellulose and lignin model compounds was investigated at 450 °C. NaOH pretreated and untreated cellulose was pyrolyzed on sand and the HZSM-5 catalysts; VPISU001 …
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Heat transfer, evaporation and carbon dioxide transfer in soil
<p>Latent heat flux associated with soil water evaporation connects the surface water balance with the surface energy balance. Soil water evaporation and soil carbon dioxide (CO2) fluxes both involve soil gas transport processes and properties, and both impact the soil environment and physical, …
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U-series dating, geochemistry, and geomorphic studies of travertines and springs of the Springerville area, east-central Arizona, and tectonic implications.
High CO2 springs and related travertine deposits of the Springerville area of east-central Arizona provide an exceptional field laboratory for understanding travertine-depositing spring systems. U-series dating of travertines provides an opportunity to unravel paleohydrologic and neotectonic …
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An experimental study of high-performance concrete using metakaolin additive and polymer admixture
… in the use of supplementary cementing materials and polymers to produce high-performance concrete. Utilizing a mineral substance as cement replacement in concrete has less environmental pollution and greatly increases the service life of the concrete structures due to improve the most of concrete …
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