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 “"gas distribution"”.
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Gas distribution in shallow packed beds
… adsorbents) and new applications (i.e. flue gas desulphurisation); the aspect ratio (height to diameter) of such beds is decreasing. Obtaining uniform gas distribution in such beds is of crucial importance in minimising operating costs and optimising plant performance. Since to some extent a …
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Gas distribution in shallow large diameter packed beds
It is important to maintain a uniform distribution of gas and liquid in large diameter packed columns to maintain mass transfer efficiency on scaling up. This work presents measurements and methods of evaluating maldistributed gas flow in packed columns. Little or no previous work has been done in …
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Predictive earthquake damage modeling for natural gas distribution infrastructure
The Pacific Gas and Electric Company (PG&E) operates and maintains 48,000 miles of natural gas pipeline, serving over 4.3 million customer accounts. Along with water, electric power, and transportation services, these lifelines serve critical functions throughout multiple communities. Considering …
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Predicting corrosion on protected buried steel natural gas distribution pipelines
… to prevent corrosion on its buried steel natural gas pipelines. However, corrosion leaks still occur. This thesis focuses on whether corrosion leaks can be predicted on steel distribution natural gas pipeline that is cathodically protected. By proactively understanding where leaks are most likely …
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Strategic design for imported liquefied petroleum gas distribution systems in East China
… government encourages the usage of natural gas and liquefied petroleum gas. It takes long time and lots of money for China to build up its natural gas grids. However, liquefied petroleum gas has been widely applied to China in recently years. With so many over-invested facilities, the …
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Gas distribution, star formation and giant molecular cloud evolution in nearby spiral galaxies
… study of the resolved properties of the cold gas in nearby galaxies at different size scales, starting from the whole galactic disk to the size of the Giant Molecular Clouds (GMCs). Differences in the shape and width of global CO and HI spectra of resolved disks of spiral galaxies are …
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An assessment of the performance of high density polyethylene copolymers for natural gas distribution pipes
… pipe by 1985. By that time, polyethylene for gas distribution pipe and fittings will represent some 30% of the total polyethylene pipe market. The performance characteristics of a high density polyethylene are significantly influenced by both molecular weight and type of comonomer; the major …
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Technologies and Methodologies to Improve Methane Emission Reporting in Natural Gas Distribution Networks within the UNEP OGMP2.0 Reporting Framework
L'abstract è presente nell'allegato / the abstract is in the attachment
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Subsurface methane migration from natural gas distribution pipelines as affected by soil heterogeneity: field scale experimental and numerical study
With the increased use of natural gas as a transition fuel on the path toward low-carbon energy, safety and environmental concerns from leaking underground natural gas pipelines are becoming more widespread. Pipeline leakage can be catastrophic when flammable mixtures of methane and air accumulate …
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Slow crack growth and associated plastic deformation in linear medium-density polyethylene
… of polyethylene (PE) pipe for use in natural gas distribution about twenty years ago, nearly one billion feet of various grades have been installed in North America. Now more than 80% of all pipe installed for natural gas distribution is made of PE, and this percentage is increasing annually. …
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The mechanism and function of transient pressure fluctuations occurring in the lungs during diving in the turtle, Trachemys (=Pseudemys); scripta elegans
… to determine if they could enhance pulmonary gas exchange. Skeletal muscle is the primary mechanism responsible for creating these pressure fluctuations, based on their persistence following inactivation or smooth muscle by atropine, a muscarinic blocking agent. Gas distribution experiments …
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Design, construction, and optimization of a magnetron sputtering system for urania deposition
… Particular detail has been provided for the gas distribution system and associated components because they were the primary responsibility of the author. The work included the procurement of standard and custom-order components which the author then used in the construction of a power supply …
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Analysing aspects of the performance of an ironblast furnace
… the simulation of a counter current compressible gas flow, through a packed bed, dealing with the momentum and thermal energy of both phases. Directional resistances were added to the gas momentum, so as to account for the interphase friction caused by the packed bed. This enabled the prediction …
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Advancing Measurement Techniques and Methods to Improve Methane Emission Estimates from Urban Natural Gas Infrastructure and Inform Mitigation
… urban CH4 emissions often originate from natural gas infrastructure, presenting a mitigation opportunity. However, the individual drivers of emissions are poorly resolved, with implications for attributing, estimating, and reducing emissions. This dissertation addresses that gap through a review …
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The power-gas demand impacts and regulatory implications for the future of gas systems under the electrification of space heating in cold climates
… broader call for decarbonization might imply for gas distribution systems, which will face declining usage and most likely infrastructural retirement. First, this thesis develops a bottom-up building energy modeling framework to quantify the hourly power and gas demand impacts of the …
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Derivation of Trace Gas Information combining Differential Optical Absorption Spectroscopy with Radiative Transfer Modelling
… constituent probing. To derive quantitative distribution data of trace gas distributions it is necessary to combine novel measurement techniques like Multi-Axis DOAS with realistic radiative transfer modelling. In this thesis three three-dimensional spherical Monte Carlo based radiative …
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Airborne Multi AXis DOAS instrument and measurements of two-dimensional tropospheric trace gas distributions
… good observation of tropospheric trace gases (e.g. NO2 and HCHO) additional information about the mixing layer height and the aerosol extinction is essential. This information can be gained from either independent measurements or retrieved from the measurements themselves. For example …
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Characterization and systems integration of microreactors
… in parallel within a system that includes gas flow control components and the associated electronic circuitry. The system built is equivalent to a conventional laboratory reactor system but in 1/10th of the space. Fluidic and electronic interfaces, thermal management, and operational safety …
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Effect of Local Bed Hydrodynamics on the Distribution of Liquid in a Fluidized Bed
… the coker regions where bitumen is injected, the gas is a mixture of product vapors and steam. Steam introduced at different levels rises through the coker: the stripping steam is injected near the bottom, then the attrition steam above the stripper and finally the bitumen atomization steam. As a …
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Improved methods for fast system reliability analysis through machine-learning-based surrogate models
… Numerical experiments on a California gas distribution network demonstrate that using the surrogate model to determine cluster connectivity introduces less than five percent error and is two orders of magnitude faster than methods using an exact connectivity evaluation to estimate the …
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