GaAs(Sb) nanostructures formed by arsenic-induced in-situ etching of III-Sb surfaces.
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Chemical milling process, which combines an aqua regia etchant with a sulfonate wetting agent, produces finishes on PH 14-8 molybdenum alloy steel to precise tolerances. This process permits precision removal of excess metal from the steel in annealed and/or aged conditions.
Variable spacing planar thermionic converter with tungsten emitter, niobium collector and niobium guard ring
Numerical analysis of relationship between current, voltage, emitter temperature, and collector temperature of cesiated thermionic converter
Cavitation damage in water to unalloyed metals and Ni superalloy, using ultrasonic vibratory testing with magnetostrictive transducer
Methods for increasing the (optical density span) of radiographs were evaluated. In one method, fluorescent dye was deposited in the tracks of the radiograph. The radiograph was then examined under ultraviolet light. The second method was a crossed Polaroid filter technique. The radiograph was placed between the filters and then illuminated with a diffuse white-light source. An increase in the optical density span from .10 to .37 was obtained with the dye method. With the Polaroid method, the increase obtained was from .10 to 2.4.
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Controlled amount of etchant applied to surface of rotating sample removes only few angstroms of material. Technique is suited to study of chemical and crystal structures. Rate can be varied through control of spin frequency, liquid viscosity, droplet size, total etchant volume, etchant concentration.