RAPID DETERMINATION OF AURORAL HEIGHTS

1964 ◽  
Vol 42 (9) ◽  
pp. 1813-1819 ◽  
Author(s):  
J. H. Brandy ◽  
J. E. Hill
Keyword(s):  
Rapid Determination ◽  
Wide Angle ◽  
Measurable Property

A method using wide-angle cameras has been developed which reduces the time and labor required for the parallactic determination of auroral heights. The system consists of two wide-angle or "all-sky" cameras at a fixed separation of 21.65 km. Simultaneous photographs from the two stations are projected on a predetermined grid from which the parallax can be read directly. Heights on arcs and bands having well-defined borders can be found over a much greater length than before and with comparative ease. The system is particularly useful during the flight of rockets into aurora and for studies of height versus any other measurable property of aurora. The accuracy obtainable is approximately ± 3%.

Weak Beam Imaging and Diffraction Studies of Stacking Faults in Silicon

1976 ◽  
Vol 34 ◽  
pp. 590-591
Author(s):  
T. Y. Tan ◽  
W. K. Tice
Keyword(s):  
Fast Neutron ◽  
Rapid Determination ◽  
Stacking Faults ◽  
Imaging Method ◽  
Large Reduction ◽  
Dislocation Loops ◽  
Fringe Spacing ◽  
Weak Beam ◽  
Kinematical Theory

In studying ion implanted semiconductors and fast neutron irradiated metals, the need for characterizing small dislocation loops having diameters of a few hundred angstrom units usually arises. The weak beam imaging method is a powerful technique for analyzing these loops. Because of the large reduction in stacking fault (SF) fringe spacing at large sg, this method allows for a rapid determination of whether the loop is faulted, and, hence, whether it is a perfect or a Frank partial loop. This method was first used by Bicknell to image small faulted loops in boron implanted silicon. He explained the fringe spacing by kinematical theory, i.e., ≃l/(Sg) in the fault fringe in depth oscillation. The fault image contrast formation mechanism is, however, really more complicated.

Methods for rapid determination of pecan (Carya illinoensis) seed viability

2017 ◽  
Vol 45 (2) ◽  
pp. 455-464
Author(s):  
T.T. Xue ◽  
J. Liu ◽  
Y.B. Shen ◽  
G.Q. Liu
Keyword(s):  
Rapid Determination ◽  
Seed Viability ◽  
Carya Illinoensis
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