2,123 research outputs found
Surface Induced Order in Liquid Metals and Binary Alloys
Measurements of the surface x-ray scattering from several pure liquid metals
(Hg, Ga, and In) and from three alloys (Ga-Bi, Bi-In, and K-Na) with different
heteroatomic chemical interactions in the bulk phase are reviewed.
Surface-induced layering is found for each elemental liquid metal. The surface
structure of the K-Na alloy resembles that of an elemental liquid metal. Bi-In
displays pair formation at the surface. Surface segregation and a wetting film
are found for Ga-Bi.Comment: 10 pages, 3 fig, published in Journal of Physics: Condensed Matte
Optical properties of the charge-density-wave polychalcogenide compounds Te (=Nd, Sm and Gd)
We investigate the rare-earth polychalcogenide Te (=Nd, Sm and
Gd) charge-density-wave (CDW) compounds by optical methods. From the absorption
spectrum we extract the excitation energy of the CDW gap and estimate the
fraction of the Fermi surface which is gapped by the formation of the CDW
condensate. In analogy to previous findings on the related Te (n=2 and
3) families, we establish the progressive closing of the CDW gap and the
moderate enhancement of the metallic component upon chemically compressing the
lattice
The right of psyche
Il contributo analizza dal punto di vista del diritto e dell'etica il trattamento sanitario del malato psichiatrico.The author deal with the treatment of psychiatric infirm
Effect of vertical active vibration isolation on tracking performance and on ride qualities
An investigation to determine the effect on pilot performance and comfort of an active vibration isolation system for a commercial transport pilot seat is reported. The test setup consisted of: a hydraulic shaker which produced random vertical vibration inputs; the active vibration isolation system; the pilot seat; the pilot control wheel and column; the side-arm controller; and a two-axis compensatory tracking task. The effects of various degrees of pilot isolation on short-term (two-minute) tracking performance and comfort were determined
Wetting Phase Transition at the Surface of Liquid Ga-Bi alloys: An X-ray Reflectivity Study
X-ray reflectivity measurements of the binary liquid Ga-Bi alloy reveal a
dramatically different surface structure above and below the monotectic
temperature C.
A Gibbs-adsorbed Bi monolayer resides at the surface at both regimes.
However, a 30 {\AA} thick, Bi-rich wetting film intrudes between the Bi
monolayer and the Ga-rich bulk for .
The internal structure of the wetting film is determined with {\AA}
resolution, showing a theoretically unexpected concentration gradient and a
highly diffuse interface with the bulk phase.Comment: 5 RevTex pages, 3 figures, Phys. Rev. Let
- …