Results 241 to 250 of about 568,795 (292)
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Materials Testing, 2001
This research focused on the development of a diffusible hydrogen sensor for steel welds. The sensor is based on the chemochromic reaction of WO 3 with hydrogen. The sensor is inexpensive, produces results quickly and has been shown to correlate with hydrogen concentrations derived using the standard gas chromatography method.
Rodney D. Smith Ii +4 more
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This research focused on the development of a diffusible hydrogen sensor for steel welds. The sensor is based on the chemochromic reaction of WO 3 with hydrogen. The sensor is inexpensive, produces results quickly and has been shown to correlate with hydrogen concentrations derived using the standard gas chromatography method.
Rodney D. Smith Ii +4 more
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Diffusion of Hydrogen in Niobium
Physical Review Letters, 1988The diffusion rate of H and D in Nb is calculated with avoidance of the usual adiabatic, linear-coupling, and Condon approximations. The method employed is a generalization of the standard small-polaron theory with explicit account taken of the coupled interstitial-host vibrations.
, Schober, , Stoneham
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Hydrogen chemical potentials and diffusion coefficients in hydrogen diffusion membranes
Nature, 1983Palladium and palladium alloys are quite widely used as membranes for hydrogen permeation, because of their resistance to embrittlement and to irreversible deformations during cycles of absorption and desorption of hydrogen1–3. The isothermal relationships between hydrogen diffusion coefficient, DH, and hydrogen content, n (ratio of hydrogen/metal ...
F. A. Lewis +3 more
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Silicon-Hydrogen Bonding and Hydrogen Diffusion in Amorphous Silicon
MRS Proceedings, 1995ABSTRACTDespite its importance for technological applications, the behavior of hydrogen in amorphous silicon is not fully understood. In particular, the anomalously low activation energy (1.5 eV) for hydrogen diffusion has remained unexplained. We investigate the interaction of hydrogen with dangling bonds using first-principles pseudopotential-density-
, Van de Walle CG, , Street
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Journal of Alloys and Compounds, 1998
Abstract The short-range and long-range diffusion of hydrogen in Dy2Fe17 was investigated by magnetic after-effect (MAE) and thermal desorption spectroscopy (TDS) measurements, respectively. After charging the powder samples in a high-purity H2 atmosphere (15 MPa, 293 K) for 3 days, their hydrogen content was determined by TDS to be Dy2Fe17H0.06 ...
N. Mommer +3 more
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Abstract The short-range and long-range diffusion of hydrogen in Dy2Fe17 was investigated by magnetic after-effect (MAE) and thermal desorption spectroscopy (TDS) measurements, respectively. After charging the powder samples in a high-purity H2 atmosphere (15 MPa, 293 K) for 3 days, their hydrogen content was determined by TDS to be Dy2Fe17H0.06 ...
N. Mommer +3 more
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Visualization of Diffusive Hydrogen
Materials Science Forum, 2010In recent years, the use of hydrogen as a clean energy has been paid attention to in terms of the prevention of global warming. Tanks composed solely of steel and cylinders consisting of aluminum liner reinforced with C-FRP in the surrounding are used to store high-pressure hydrogen gas in hydrogen stations and in fuel cell vehicles, respectively.
Takahito Watakabe +2 more
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Ultrathin Hydrogen Diffusion Cloak
Advanced Theory and Simulations, 2017AbstractFor years, hydrogen damage is a fatal threat to metals and alloys in long‐term service. This paper introduces the transformation optics theory in metamaterials to the diffusive field, and the design of an ultrathin hydrogen diffusion cloak. Thanks to the alternately and gradually changed diffusion coefficients in adjacent layers, the laminated ...
Yang Li +4 more
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Nature, 1967
HYDROGEN isotope diffusion in metals and polymers has generally been treated in the literature as a single body problem with the motion of the hydrogen regarded as the important parameter. On this basis the equation for interstitial diffusion of hydrogen atoms in metals or molecular diffusion in polymers follows an equation of the form
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HYDROGEN isotope diffusion in metals and polymers has generally been treated in the literature as a single body problem with the motion of the hydrogen regarded as the important parameter. On this basis the equation for interstitial diffusion of hydrogen atoms in metals or molecular diffusion in polymers follows an equation of the form
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Hydrogen diffusion in tantalum
Physics Letters A, 1988Abstract Using the small-polaron theory of diffusion we obtain a very good fit of the experimental data on hydrogen diffusion in tantalum between 15 and 500 K. It is shown that the phenomenon has three regimes: (a) At T > 250 K the transport occurs mainly by hydrogen tunneling between tetrahedral sites. (b) At 200 K >T > 15 K metastable states having
MIRANDA, L +3 more
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