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Transient and temperature-dependent phenomena in Ge:Be and Ge:Zn far infrared photoconductors

Description: An experimental study of the transient and temperature-dependent behavior of Ge:Be and Ge:Zn photoconductors has been performed under the low background photon flux conditions (p dot approx. = 10/sup 8/ photons/second) typical of astronomy and astrophysics applications. The responsivity of Ge:Be and Ge:Zn detectors is strongly temperature-dependent in closely compensated material, and the effect of compensation on free carrier lifetime in Ge:Be has been measured using the photo-Hall effect tech… more
Date: November 1985
Creator: Haegel, Nancy Marie
Partner: UNT Libraries Government Documents Department
open access

Field investigation of keyblock stability

Description: Discontinuities in a rock mass can intersect an excavation surface to form discrete blocks (keyblocks) which can be unstable. This engineering problem is divided into two parts: block identification, and evaluation of block stability. One stable keyblock and thirteen fallen keyblocks were observed in field investigations at the Nevada Test Site. Nine blocks were measured in detail sufficient to allow back-analysis of their stability. Measurements included block geometry, and discontinuity rough… more
Date: April 1, 1985
Creator: Yow, J. L., Jr.
Partner: UNT Libraries Government Documents Department
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