Reconfigurable low-power wideband receiver for cosmic noise radiation absorption measurements

Author(s):  
G. Dekoulis
1971 ◽  
Vol 49 (11) ◽  
pp. 1411-1418
Author(s):  
M. A. Abdu ◽  
E. L. Vogan

Cosmic noise absorption measurements at 30 MHz were made simultaneously on two antennas having different beam widths at London, Ontario(53 °N geomagnetic, L = 3.1), a subauroral zone station. The data show that absorption is caused by regions of ionization which exhibit marked spatial non-uniformity within the antenna beams, and which have horizontal extensions limited more toward the south than toward the north of the station. The measurements also indicate the presence of auroral ionization at all times of the day over London.


Author(s):  
Z. L. Wang ◽  
C. Colliex ◽  
V. Paul-Boncour ◽  
A. Percheron-Guegan

Intermetal1ic compounds, such as LaCo5, have been used as active and selective catalysts in chemical reaction involving (CO,H2) mixtures. The general understanding regarding these catalysts is that the observed activation is associated with a partial transformation of the intermetallic component into a metal-support system. The macroscopic study of LaCo3 by use of synchrotron radiation absorption measurements (EXAFS and XANES data analysis) largely support this hypothesis. In this work, the microscopic structure of these catalysts has been studied by HRAEM.


1964 ◽  
Vol 42 (7) ◽  
pp. 1382-1386 ◽  
Author(s):  
E. L. Vogan

Riometer data obtained from several Canadian stations during the total solar eclipse of July 20, 1963, are presented and discussed. A small increase in cosmic noise level, amounting to about 0.25 dB at 30 Mc/s, was observed at Ottawa, Cape Jones, and Churchill.


1974 ◽  
Vol 11 (1) ◽  
pp. 111-129 ◽  
Author(s):  
James R. Stallcop

The formalism for the calculation of the absorption of radiation by a hydrogen plasma at common laboratory conditions is summarized. The hydrogen plasma absorption coefficient for laser radiation has been computed for a wide range of electron densities (1015- 1018 cm-3) and temperatures (10 000–40 000 °K). The results of this computation are presented in a graphical form that permits a determination of the absorption coefficient for the following laser wavelengths: 0.176, 0.325, 0.337, 0.442, 0.488, 0.51, 0.633, 0.694, 1.06, 1.15, 2.36, 3.39, 5.40 and 10.6 Μm. The application of these results and laser radiation absorption measurements to plasma diagnostics is discussed briefly.


2006 ◽  
Vol 111 (A11) ◽  
Author(s):  
Y.-M. Tanaka ◽  
M. Kubota ◽  
M. Ishii ◽  
Y. Monzen ◽  
Y. Murayama ◽  
...  

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