Results 261 to 270 of about 313,193 (294)

The solid-solubility of oxygen in Nb and Nb-rich, Nb-Hf, Nb-Mo and Nb-W alloys

Journal of the Less Common Metals, 1967
Abstract By comparison with oxygen and nitrogen, the amount of carbon which can be taken into interstitial solid solution in Nb and Nb-rich Nb-Hf, Nb-Mo and Nb-W alloys is very small. Over the temperature range 1600°–2180°C the solid-solubility limit of carbon in niobium is about 0.55 at.%, and this is reduced by the alloying elements Hf and Mo.
A. Taylor, N.J. Doyle
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Hydrogen in Nb/Hf/Nb and Nb/Ti/Nb thin films

Journal of the Less Common Metals, 1991
Abstract Thin films with layer sequences Nb/Hf/Nb and Nb/Ti/Nb/Au were prepared by electron-beam evaporation in ultrahigh vacuum. The interfaces were characterized by measuring the momentary surface properties by low energy electron diffraction and Auger electron spectroscopy after various evaporation steps.
J STEIGER, O BOEBEL, S BLASSER, A WEIDINGER   +3 more
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The NBS Atomic Time Scale System: AT(NBS), SAT(NBS), and UTC(NBS)

24th Annual Symposium on Frequency Control, 1970
The accuracy involved both the 5 part in IOL3 uncertainty in NBS I11 and the frequency dispersion of the ensemble after calibration. To determine the precision capabilities, noise models were established for the time dispersion character is t ics of each clock in the ensemble, Some theoretical considerations based on these models yielded very ...
D.W. Allan, J.E. Gray, H.E. Machlan
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Interdiffusion in Nb-Mo, Nb-Ti and Nb-Zr Systems

Defect and Diffusion Forum, 2012
Diffusion couple technique is used to study interdiffusion in Nb-Mo, Nb-Ti and Nb-Zr systems. Interdiffusion coefficients at different temperatures and compositions are determined using the relation developed by Wagner. The change in activation energy for interdiffusion with composition is determined.
Soma Prasad, Aloke Paul
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NBS-4 and NBS-6: The NBS Primary Frequency Standards

Metrologia, 1977
The NBS primary frequency standard NBS-4 has been operating since January 1973. NBS-5 operated from January 1973 until March 1974. At this time NBS-5 was modified significantly and redesignated NBS-6. The extent and character of these design changes are discussed. NBS-6 operation and evaluation began in March 1975.
David J Glaze, Helmut Hellwig, David W Allan, Stephen Jarvis   +3 more
openaire   +1 more source

Resistive transitions in Nb/Cu0.41Ni0.59/Nb trilayers

JETP Letters, 2008
The superconducting phase transition in Nb/Cu0.41Ni0.59/Nb trilayers, with superconducting (S) Nb and ferromagnetic (F) Cu0.41Ni0.59, has been experimentally studied as a function of the F-layer thickness by measuring the temperature dependence of the electrical resistance R (T).
Prischepa, S. L., Cirillo, C., Bell, C., Kushnir, V. N., Aarts, J., Attanasio, C., Kupriyanov, M. Yu., Bell, Chris   +7 more
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Superconducting transition in Nb/Gd/Nb trilayers

Physical Review B, 1996
We report the observation of oscillations in the superconducting transition temperature {ital T}{sub {ital c}} of Nb/Gd/Nb trilayers as the Gd layer thickness {ital d}{sub Gd} is varied. The {ital T}{sub {ital c}} minimum occurs at {ital d}{sub Gd}{approx_equal}13 A.
, Jiang, , Davidovic, , Reich, , Chien
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A Paramagnetic Diniobium Complex with a Very Short Nb−Nb Distance: Evidence for a Pseudo Nb−Nb Triple Bond?

Angewandte Chemie International Edition, 1999
In spite of the short Nb-Nb distance (2.268 Å) and the presumable existence of an Nb identical withNb bond, the paddle-wheel-shaped diniobium(II) complex 1 is paramagnetic. Theoretical calculations indicate that the presence of LiCl moieties on the intermetallic axis lowers the Nb-Nb bond order and is responsible for the observed paramagnetism.
, Tayebani, , Feghali, , Gambarotta, , Yap, , Thompson   +4 more
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Nonequilibrium phenomena in superconducting double-barrier structure Nb/Nb'/Nb

Physica B: Condensed Matter, 1994
Abstract We report the first experimental data indicating on the influence of the nonequilibrium quasiparticles with the energy near gap in SDBS in the case when the injection rate of the quasiparticles with the higher energy exceeds the inelastic relaxation rate.
G.A. Ovsyannikov, K.V. Pobydzey, L.V. Filippenko   +2 more
openaire   +1 more source