Results 271 to 280 of about 875,486 (317)
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An example of the effect of hydrogen trapping on hydrogen embrittlement
Metallurgical Transactions A, 1981The role of internal hydrogen in reducing the tensile reduction of area of iron-titanium alloys is examined. The population of hydrogen at potential crack nucleii is shown to be controlled by its dynamic interaction with mobile dislocations and its subsequent transport to fixed traps. Expressions are developed for both the number of hydrogen atoms at a
G. M. Pressouyre, I. M. Bernstein
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Effect of Hydrogen-Hydrogen Exchange Collisions
Physical Review, 1963Exchange collisions between ground-state hydrogen atoms are considered. The density matrix after collision is calculated for pairs of atoms which initially had the same density matrix. The result is applied to the hydrogen maser with the assumption that only exchange collisions and the escape of atoms from the storage bulb influence the linewidth for ...
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The secondary hydrogen isotope effect
The International Journal of Applied Radiation and Isotopes, 1960Abstract Secondary isotope effects are reviewed with particular regard to their interpretation within a consistent scheme. It appears that adherence to formal considerations of vibrational frequency shifts is inadequate for the interpretation of many experimental results, and that these may be more fruitfully discussed in terms of “electronic ...
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The Effect of Hydrogen on Non-Linear Flame Saturation
Volume 3B: Combustion, Fuels, and Emissions, 2023Abstract We investigate the effect of increasing levels of hydrogen enrichment on the non-linear response and saturation of premixed bluff-body stabilised methane/hydrogen flames submitted to acoustic forcing. The thermal power is kept approximately constant to preserve the nozzle velocity whilst increasing the flame speed through ...
Æsøy, Eirik +3 more
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Nonadiabatic Effects in Hydrogen Diffusion in Metals*
Zeitschrift für Physikalische Chemie, 1992Molecular dynamic simulations for hydrogen diffusion in Pd are perfomed, using a potential based on the embedded-atom method. It is found that a single adiabatic Born-Oppenheimer potential energy surface cannot reproduce the wave-vector dependence of the quasielectric peak obtained in neutron scattering studies.
, Li, , Wahnström
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The Isotope Effect in Hydrogen-Bonded Systems
International Journal of Modern Physics B, 1998The giant isotope effect on the ferro- and antiferroelectric transition temperature upon deuteration of hydrogen-bonded systems is well known experimentally since various decades. Yet, theoretically only recently a microscopic understanding of this effect has been achieved which, specifically, took into account the geometry of the O ⋯ H ⋯ O bond.
Bussmann-Holder, A., Michel, K.H.
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Journal of the Optical Society of America, 1962
This paper gives a theoretical treatment of atomic hydrogen in an external electric field. The positions and half-widths of the energy levels which are near the peak of the effective potential barrier are found. The problem is solved by applying Wentzel–Kramers-Brillouin–type approximations to the Schrodinger equation separated in parabolic coordinates;
M. H. Rice, R. H. Good
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This paper gives a theoretical treatment of atomic hydrogen in an external electric field. The positions and half-widths of the energy levels which are near the peak of the effective potential barrier are found. The problem is solved by applying Wentzel–Kramers-Brillouin–type approximations to the Schrodinger equation separated in parabolic coordinates;
M. H. Rice, R. H. Good
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Triatomic Hydrogen and Doppler Effect in Hydrogen Positive Rays
Nature, 1947J. J. THOMSON1 discovered the triatomic molecule of hydrogen by the positive ray parabolic method. It was later confirmed by Dempster2, Duane and Wendt3, and several others. Its occurrence is very frequently noted in discharge tubes, but the optimum conditions are not well defined. While investigating the Doppler effect in hydrogen positive rays, using
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Chemical Physics Letters, 1993
Abstract The hyperpolarizability of H2 has been determined from measurements of the dc Kerr effect for H2 gas at T = 25°C and λ = 632.8 nm. The result of these measurements, λev = (4.48 ± 0.05) X 10−62C4 m4 J−3 (γev = 719 ± 7 au), is in fair agreement with the result of the most recent ab initio calculation for H2, γev = 726 au.
D.P. Shelton, B. Rugar
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Abstract The hyperpolarizability of H2 has been determined from measurements of the dc Kerr effect for H2 gas at T = 25°C and λ = 632.8 nm. The result of these measurements, λev = (4.48 ± 0.05) X 10−62C4 m4 J−3 (γev = 719 ± 7 au), is in fair agreement with the result of the most recent ab initio calculation for H2, γev = 726 au.
D.P. Shelton, B. Rugar
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Materials Science and Engineering, 1988
Abstract The effect of hydrogen on the physical properties of copper is considered with emphasis on determining which form of hydrogen is responsible for the property change. Three situations in which the properties of copper are known to be affected by hydrogen are (1) thermal charging, (2) cathodic charging and (3) electroless copper plating. It is
S. Nakahara, Y. Okinaka
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Abstract The effect of hydrogen on the physical properties of copper is considered with emphasis on determining which form of hydrogen is responsible for the property change. Three situations in which the properties of copper are known to be affected by hydrogen are (1) thermal charging, (2) cathodic charging and (3) electroless copper plating. It is
S. Nakahara, Y. Okinaka
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