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 19 of 19 for “"Hydrogen Systems"”.
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Equilibrium and diffusion studies of metal-hydrogen systems
… pertaining to equilibrium properties of hydrogen in random binary substitutional alloys at room and lower temperatures, describing both statistics and kinetics of hydrogen in them. They represent a solution to the problem of the complete Fermi-Dirac description which is physically …
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Low-Temperature Internal Friction in the Niobium - Hydrogen and Niobium - Oxygen - Hydrogen Systems
Made available in DSpace on 2014-12-12T01:04:10Z (GMT). No. of bitstreams: 1 7500364.pdf: 2681652 bytes, checksum: 4bcad42d06b9189eb9b576b4a5e3efb5 (MD5) Previous issue date: 1974
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The adoption of renewable hydrogen for a cost-effective decarbonization of hard-to-abate industries - Development of an optimization framework for the cost-optimal design of power-to-hydrogen systems
L'abstract è presente nell'allegato / the abstract is in the attachment
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Hydrogen storage of energy for small power supply systems
Power supply systems for cell phone base stations using hydrogen energy storage, fuel cells or hydrogen-burning generators, and a backup generator could offer an improvement over current power supply systems. Two categories of hydrogen-based power systems were analyzed: Wind-hydrogen systems and …
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Crystallographic, Morphological and Kinetic Studies of the Alpha-Beta Transformation in the Niobium-Hydrogen System
The group VB bcc metal-hydrogen systems have been extensively studied in the last few years. These studies are relevant to nuclear-reactor technology, superconductivity, and energy storage devices. The elements nitrogen and hydrogen form interstitial solid solutions with the group VB bcc metals and …
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ΜΕΛΕΤΗ ΤΗΣ ΚΑΤΑΝΟΜΗΣ ΥΔΡΟΓΟΝΟΥ ΣΕ ΛΕΠΤΑ ΥΜΕΝΙΑ ΔΥΟ ΣΤΡΩΜΑΤΩΝ ΔΙΑΦΟΡΕΤΙΚΩΝ ΜΕΤΑΛΛΩΝ
… HAS BEEN EMPLOYED FOR THE DETERMINATION OF THE HYDROGEN DEPTH DISTRIBUTION IN SOME THIN FILMS OF METAL-HYDROGEN SYSTEMS ONTO A STAINLESS STEEL SUBSTRATE. THE INVESTIGATED FILMS WERE: THE SINGLE LAYER FILMS V-H AND TI-H AND THE THIN FILMS SANDWICHES (FILMS CONSISTING OF TWO THIN LAYERS OF …
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Analytics for Sustainable Logistics: Fuel Efficiency and Hydrogen Planning
… solutions seeks to improve current operational systems and processes, often in data-rich environments. A second category involves leveraging emerging technologies toward zero-emissions transportation, often in the absence of detailed operating data and established procedures. In this thesis, we …
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Application of Criteria for Hydrogen Transportation Refueling for Several Countries Considering Energy Resource and Use Implications
The transition to hydrogen-based transportation requires strategic evaluation of energy sources, infrastructure, and regional capabilities. This study investigates the feasibility of hydrogen refueling for ground transportation by implementing the established criteria for transitioning from …
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An analysis of distributed solar fuel systems
While solar fuel systems offer tremendous potential to address global clean energy needs, most existing analyses have focused on the feasibility of large centralized systems and applications. Not much research exists on the feasibility of distributed solar fuel systems. This thesis is an attempt to …
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Electrochemical H insertion in Pd thin films
… are pertinent to several applications, including hydrogen storage, gas separation, and electrocatalysis. The Pd-H system is used as a model for metal-hydrogen systems and the effect H insertion has on their properties. A study was conducted to assess the performance of various electrochemical cell …
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Design studies of infrastructural development for applications of hydrogen energy technologies
… in biogas using integrated heat, power, and hydrogen systems. A study was performed on both energy flow and resource availability to ascertain not only the type but also the source of feedstock needed to run a fuel cell system continuously while maintaining maximum capacity. A hydrogen …
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Intergalactic baryon enrichment and implications for galaxy evolution at high redshift
… 3.5, we study chemical abundances of Lyman limit systems (LLSs) and evaluate their potential to represent expected reservoirs of cold, low-metallicity gas whose accretion onto galaxies is necessary to maintain star formation. In an initial survey focused only on LLSs identified as potential …
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Recovery Of Hydrogen And Helium From Their Mixtures Using Metal Hydrides
Waste streams of hydrogen and helium mixtures are produced at the Kennedy Space Center during purging of the hydrogen systems and supply lines. This process is done prior to and after hydrogen servicing. The purged waste gases are lost to the atmosphere, resulting in an annual loss of 2 million and …
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An investigation of hydrogen bonded molecular systems using X-ray and neutron diffraction
… project have been investigations of a variety of hydrogen bonding systems for unusual behaviour such as disordered or migrating hydrogens/protons with both single crystal X-ray and neutron diffraction, crystallisation of a large number of molecular complexes of the chloranilic acid molecule, and …
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Economic valuation of energy storage coupled with photovoltaics : current technologies and future projections
… the economic valuation of current energy storage systems coupled with photovoltaic (PV) systems is presented. The solar-with-storage system's operation is optimized for two different rate schedules: (1) Time-of-use (TOU) for residential systems, and (2) Real-time wholesale rates for centralized …
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A geospatial economic analysis of hydrogen production from offshore wind using electrolysers
… energy has driven growing interest in green hydrogen as an energy carrier. Green hydrogen refers to hydrogen produced without generating carbon emissions. Typically, it’s produced from renewable energy sources. Combined with the advantages of offshore wind, green hydrogen production from …
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Chemical Looping Electricity Storage
… air/water, new storage solutions must be found. Hydrogen and pumped thermal storage have emerged as options, but hydrogen suffers from low round-trip efficiency and pumped thermal has a relatively low capacity. In a pumped thermal electricity storage system, electricity is converted to heat using …
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Improved System Models for Building-Integrated Hybrid Renewable Energy Systems with Advanced Storage: A Combined Experimental and Simulation Approach
… of building-integrated small-scale energy systems such as photovoltaics (PV), wind turbines and micro-combined heat and power (CHP) have significantly increased. However, the power output of PV and wind turbines is inherently linked to weather conditions; thus, the injected power into the …
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Effects of blade configuration on flow distribution and power output of a zephyr vertical axis wind turbine.
Worldwide interest in renewable energy systems has increased dramatically, due to environmental concerns like climate change and other factors. Wind power is a major source of sustainable energy, and can be harvested using both horizontal and vertical axis wind turbines. This thesis presents …