Gust Design Procedures Based on Power Spectral Techniques

1967 ◽  
Author(s):  
John C. Houbolt
Keyword(s):  
Spectral Techniques ◽  
Design Procedures ◽  
Power Spectral

Inland, Coastal, and Offshore Magnetotelluric Measurements in Eastern Canada

1971 ◽  
Vol 8 (2) ◽  
pp. 204-216 ◽  
Author(s):  
S. P. Srivastava ◽  
A. White
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
East Coast ◽  
Vertical Component ◽  
Eastern Canada ◽  
Spectral Techniques ◽  
Relative Attenuation ◽  
Field Recordings ◽  
Power Spectral ◽  
The Magnetic Field

For six weeks during the summer of 1966 simultaneous magnetic and electric field recordings were made on the east coast of Canada at Fredericton, N.B., Halifax, N.S., and Sable Island. The data from these stations have been analyzed using power spectral techniques. Comparison of the simultaneous recordings from Halifax and Sable Island with those from Fredericton and Agincourt indicate some enhancement in the intensity of the vertical component of the magnetic field for periods less than 40 min at Halifax and attenuation in its intensity for periods less than 3 h at Sable Island. The enhancement at Halifax has been interpreted in terms of the "coast effect" while the effect of the island and of differences in the subsurface conductivity under the continent and under the ocean have been shown to be possible causes of the relative attenuation in the Z variations at Sable Island.

A STATISTICAL ANALYSIS OF SOME AEROMAGNETIC MAPS FROM THE NORTHWESTERN CANADIAN SHIELD

Geophysics ◽  
1964 ◽  
Vol 29 (4) ◽  
pp. 582-601 ◽  
Author(s):  
C. W. Horton ◽  
W. B. Hempkins ◽  
A. A. J. Hoffman
Keyword(s):  
Statistical Analysis ◽  
Structural Information ◽  
Wave Length ◽  
Magnetic Anomalies ◽  
Geological Structure ◽  
Spectral Techniques ◽  
Structural Trend ◽  
Power Spectral ◽  
Good Agreement ◽  
Geologic Data

Autocovariance and power‐spectral techniques are applied to aeromagnetic maps from the District of MacKenzie, Northwest Territories, Canada, to obtain trend directions and other structural information. Such trends are representative of the geologic structures creating the magnetic anomalies, and they are subjected to structural analysis. Results of computations for four maps 17×17 miles in size and one profile 185 miles long show good agreement with the known geological structure of the region. These analyses predict a dominant structural trend from S 18° W to N 18° E and two associated conjugate shear directions. In addition, an unexplained basic periodicity with a wave length of 15 miles is shown. This type of statistical analysis is suggested as a new tool for the extension of geologic data into inaccessible or covered regions.

Exercise-induced amplitude modification of physiological action tremor of the ankle

1982 ◽  
Vol 53 (5) ◽  
pp. 1164-1170 ◽  
Author(s):  
P. A. Iaizzo ◽  
R. S. Pozos
Keyword(s):  
Spinal Reflexes ◽  
Upper Body ◽  
Normal Male ◽  
Action Tremor ◽  
Male And Female ◽  
Spectral Techniques ◽  
Physiological Action ◽  
Power Spectral ◽  
Exercise Induced ◽  
Surface Electromyograms

To determine whether exercise would affect physiological action tremor (PAT), normal male and female subjects exercised either by running or lifting weights. Surface electromyograms and acceleration recordings were analyzed using power spectral techniques to quantitate variations in amplitude and/or frequency of PAT. The results of this study show that running causes an increase in the amplitude of PAT. By having subjects run successively longer distances, a graded increase in amplitude of PAT was observed. After the subjects ran for long periods of time, PAT continued as an overt continuous oscillation. This oscillation did not greatly differ from pathological clonus. Furthermore, exercising the upper body alone by lifting weights increased the amplitude of PAT of the ankle. The results suggest that the exercise may cause alterations in the gain of the spinal reflexes which may lead to an underdamping of PAT. As the gain of the reflexes controlling PAT increases, this may lead to overt continuous oscillations, such as physiological or pathological clonus.

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