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Showing 1 to 13 of 13 for “"trapped hydrogen"”.
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Anelastic Studies of Interstitially Trapped Hydrogen in Niobium
Made available in DSpace on 2014-12-14T16:00:41Z (GMT). No. of bitstreams: 1 8004311.pdf: 3471204 bytes, checksum: 973e15c4ad4d45da79cb1d1ca8423f55 (MD5) Previous issue date: 1979
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An ultrasonic study of trapped hydrogen in niobium
… is to establish a model for the configuration of hydrogen trapped at interstitial oxygen or nitrogen impurities in BCC metals. Such a model would 'be important for an understanding of the physical properties of such systems, particularly of the quantum diffusion effects which occur. A review of …
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Molecular Encapsulation in Kinetically Trapped, Hydrogen-Bonded Pyrogallolarene Hexamers
<p>Pyrogallolarene and resorcinarene hexamers are hydrogen-bonded capsules that self-assemble in the solid state and can be studied in gaseous and solution phases. Guest loading within pyrogallolarene hexamers in solution has primarily been comprised of solvent molecules with some tertiary amines. …
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Interaction of Trapped Hydrogen With Dislocations at Low-Temperature in Deformed Palladium
Given such low hydrogen concentration in the heavily deformed Pd, this behavior is representative of hydrogen trapped at dislocations at low temperature. Correlating the spatial and the vibrational characterization of the Cottrell atmosphere demonstrated the phase behavior of the trapped solute …
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An Ultrasonic Study of Trapped Hydrogen Tunneling Systems in Niobium and Tantalum
The properties of trapped hydrogen tunneling systems in Nb and the analogous systems, H in Ta, and D in Nb have been studied with ultrasonic techniques at low temperature. Attenuation due to H in Ta was measured between 0.5 K and 10 K for frequencies between 10 MHz and 55 MHz. The sound velocity …
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An ultrasonic study of trapped hydrogen tunneling systems in Nb and Ta
The properties of trapped hydrogen tunneling systems in Nb and the analogous systems, H in Ta, and D in Nb have been studied with ultrasonic techniques at low temperature. Attenuation due to H in Ta was measured between 0.5 K and 10 K for frequencies between 10 MHz and 55 MHz. The sound velocity …
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Interaction of trapped hydrogen with dislocations at low-temperature in deformed Pd
… was to investigate the phase behavior of the trapped solute influenced by the distorted dislocation environment. The phase behavior of the Cottrell atmosphere in deformed Pd was investigated as a function of temperature by incoherent inelastic neutron scattering (IINS) and small angle neutron …
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1S-2S spectroscopy of trapped hydrogen : the cold collision frequency shift and studies of BEC
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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Trapped hydrogen vibrational density of states measurement using IINS PdH0.0011 at 5 K and 300 K with incident neutron energy of 250 meV
Hydrogen trapped at dislocations in Pd was studied with the incoherent inelastic neutron scattering (IINS) at two temperatures over the energy transfer range of 250 meV. The primary objective of this study was to study the vibrational density of states (VDOS) of deformed PdH0.0011 at 5 and 300 K …
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Spectroscopy of ultracold metastable hydrogen : in pursuit of a precision measurement
This thesis describes the first observations in trapped hydrogen of optical transitions starting from the metastable 2S state. It covers in detail the design and construction of two stabilized diode laser systems for performing spectroscopy of the 2S-3P and 2S-8S transitions. Spectroscopy of the …
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Formation and decay of a Bose-Einstein condensate in atomic hydrogen
… of a Bose-Einstein condensate (BEC) in atomic hydrogen is studied. Magnetically trapped hydrogen atoms were evaporatively cooled close to the onset of Bose-Einstein condensation and then suddenly quenched below the transition temperature. The subsequent condensate formation and decay were …
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Hydrogen embrittlement resistance in advanced high strength: vanadium bearing and TRIP-assisted steels
… damage, these lead to failure especially when hydrogen enters the lattice and gets trapped in defects. It is desired to design advanced steels highly resistant to hydrogen embrittlement (HE), while preserving a balance between their superior strength and ductility. For this purpose, a new …
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The first high-strength bainitic steel designed for hydrogen embrittlement resistance
The phenomenon of hydrogen embrittlement in steel has been known for over 150 years. Hydrogen-resistant alloys have been developed to mitigate this effect and three types of alloys with optimised structures have been enhanced over the years: nickel alloys, stainless steels, and quenched and …