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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 138 for “"hydrogen gas"”.
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An investigation of hydrogen gas in olivine
… study was designed to explain natural seeps of hydrogen gas. Ordinarily H2 occurrences are regarded to be product of the process of serpentinization. However other sources or explanation may exist for the natural hydrogen gas seeps. For example Zhang et al. (2005) concluded that hydrogen gas …
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Extrinsic Fabry-Perot Interferometric hydrogen gas sensor
The detection and active monitoring of hydrogen gas levels is essential in many areas of industry including manufacturing, storage, and transport of this gas. Previously, methods used to detect hydrogen gas have relied upon monolithic technologies to create resistive-based sensors which are …
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Exploration of Hydrogen Gas Evolution from Radioactive Sludges
… exists in large quantities, it is known that hydrogen gas will be produced by radiolysis. It is clear that fundamental understanding of this process is required to build confidence in the proposed disposal plans.<br/><br/>In this investigation, we start with a simple model of bulk brucite, the …
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Hydrogen Gas Production By a Species of Ectothiorhodospira
A hydrogen gas (H₂) producing species of Ectothiorhodospira isolated from Soap Lake, Washington, possessed the nitrogenase enzyme complex. Increasing evolution of H₂ with decreasing ammonium chloride (NH₄C1) concentrations provided evidence that nitrogenase was the catalyst in gas production. Cells …
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The far-infrared absorption spectrum of low temperature hydrogen gas
The far-infrared absorption spectrum of normal hydrogen gas has been measured from 20-320 cm' (A=500-31 pm), over the temperature range 21-38 K, and the pressure range0.6-3 atmospheres. The spectra cover the very weak and broad collision-induced translational absorption band of 112 which at these …
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Monte Carlo Methods: Application to Hydrogen Gas and Hard Spheres
The challenges in constructing an efficient CEIMC simulation center mostly around the noisy results generated from the QMC computations of the electronic energy. We introduce two complementary techniques, one for tolerating the noise and the other for reducing it. The penalty method modifies the …
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Monte Carlo methods: application to hydrogen gas and hard spheres
… CEIMC method is applied to a system of molecular hydrogen at temperatures ranging from 2800K to 4500K and densities from 0.25 to 0.46 g/cm3. VMC requires optimizing a parameterized wave function to find the minimum energy. We examine several techniques for optimizing VMC wave functions, focusing …
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Elastic scattering and transport of tin ions in hydrogen gas
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-08-01
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Experimental and computational investigation of tin interaction with hydrogen gas
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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CdSe based nanowires for the photocatalytic production of hydrogen gas
Photocatalytic production of hydrogen was investigated towards achieving a decarbonized supply of hydrogen gas for clean energy conversion technologies such as the proton exchange membrane fuel cell (PEMFC). This study uses a template-directed electrodeposition technique to synthesize …
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Hydrogen Gas Production and Effects During Remediation Using Nano-scale Zero-valent Iron
… an understanding of the potential effects of hydrogen gas (H2) exsolution during nanoscale zero-valent iron (nZVI) groundwater remediation applications. An improved understanding of gas exsolution and its effects can be applied to remediation technologies that produce gas in excess of …
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Hydrogen gas generation by water vapor dissociation in an Al/Al2O3 microchannel plasma device
An aluminum/alumina (Al/Al2O3) microchannel plasma reactor is used to generate H2 with an energy efficiency of 2.5 % by dissociating water vapor in Ar at atmospheric pressure and room temperature. The value compares favorably to other plasma reactors reported in the literature, having reported …
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Reductions by Cobalt-Catalyzed Production of Hydrogen Gas from NaBH4 in a Two-Chamber System
… system </em>for conducting catalytic hydrogenation reactions by obtaining hydrogen (H<sub>2</sub>) gas from stable sodium borohydride (NaBH<sub>4</sub>). Whereas NaBH<sub>4</sub> is widely used for a variety of reductions and is known to produce H<sub>2</sub> gas in protic media, to …
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Measurement of the Rate of Muon Capture in Hydrogen Gas and Determination of the Proton's Pseudoscalar Coupling
… of union atomic and molecular kinetics in hydrogen, important for understanding many of the key features the experiment, is discussed in Chapter 3. The MuCap experimental design and apparatus are presented with selected details in Chapter 4. The next two chapters cover data analysis, …
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Co-gasification of biomass and plastic waste in a bubbling fluidized bed reactor
… all considered major producers of biowaste. Co-gasification is considered one of the most promising methods of chemical recycling that targets the production of syngas (hydrogen and carbon monoxide) and light hydrocarbon gases. In this study, the gasification of pure birch sawdust wood (BSD) and …
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Hydrogenase of Clostridium acetobutylicum ATCC 824
… that produces acetic and butyric acids, hydrogen gas, and carbon dioxide during the exponential phase of growth. When the culture pH is allowed to remain near 4.5, the metabolism switches to the production of the neutral compounds (solvents) - acetone, n-butanol, and ethanol. The two …
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Impact of metallic nanoparticles on anaerobic digestion
… of methanogenesis along with reduced biogas production, prolonged period of accumulation of VFAs, soluble COD, low pH, and decrease in methanogenic population. With the addition of the same amount of bulk silver ions (10 mg Ag/kg); however, there was no inhibition on methane production. …
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Modeling and simulation of high pressure composite cylinders for hydrogen storage
"Composite hydrogen cylinders provide an efficient means of storage of hydrogen gas for modern hydrogen vehicles. Safety issues arising from the high gas pressure, temperature variation, fire attack, and fracture failures are the main concerns. The focus of this study is to develop a Finite Element …
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BARDS analysis of real-time H2 and O2 gas evolution during the total water splitting of an aqueous electrolyte
Hydrogen fuel cell technology has the potential for integration with renewable energy sources to produce electricity without the need for fossil fuels and thus reducing greenhouse gas emissions. A downside to the use of fuel cells is the electrodes used in the production of hydrogen gas are …
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Hybrid bio-templated catalysts
… last decade the ability to reform ethanol into hydrogen gas suitable for fuel cell use has drawn interest as a way to increase the efficiency of both vehicles and standalone power generators. In this work, the M13 virus has been used as a biological scaffold and template to form hybrid …
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