Determination of Velocity-Depth Distributions by Inversion of Refraction Time Distance Data

1980 ◽  
Vol 11 (3) ◽  
pp. 92-98 ◽  
Author(s):  
S. A. Greenhalgh ◽  
D. W. King
Keyword(s):  
Distance Data ◽  
Time Distance ◽  
Depth Distributions

scholarly journals Determination of Velocity – Depth Distributions by Inversion of Refraction Time – distance Data: Discussion

1981 ◽  
Vol 12 (3) ◽  
pp. 52-54
Author(s):  
Robert J. Whiteley ◽  
Derecke Palmer ◽  
Stewart Greenhaigh ◽  
David King ◽  
Donald Emerson
Keyword(s):  
Distance Data ◽  
Time Distance ◽  
Depth Distributions

scholarly journals The Global Hubble Constant

1990 ◽  
Vol 43 (2) ◽  
pp. 189
Author(s):  
N Visvanathan
Keyword(s):  
Large Scale ◽  
Velocity Dispersion ◽  
Hubble Constant ◽  
Virgo Cluster ◽  
A Value ◽  
Best Value ◽  
Nearby Galaxies ◽  
Distance Data ◽  
Distance Relation

A review of large-scale investigations of the determination of H is presented. The infrared period-luminosity relation of Cepheids gives distances accurate to -2% to nearby galaxies. Based on the distances of M31, MH, N300 and N2403, a DM of 31 �30 �O� 20 has been derived to the nearby Virgo cluster from the TF relation of spirals at four wavebands. Distances to more distant clusters extending up to a redshift of -10000 km S-I obtained through the CM relation of E galaxies, the TF relation of spirals and the velocity dispersion-luminosity relation of E galaxies give a value of H of 71 km S-I Mpcl when these distances are normalised to a Virgo DM of 31�30. The scatter in the redshift-distance relation of these clusters is -500 km s-I arising from the presence of unaccounted peculiar motions of individual clusters. The magnitude limited all-sky samples of galaxies also give a value of H near 70 km S-I Mpcl once the data are corrected for Malmquist bias. The best value of the global Hubble constant obtained from the redshift-distance data of Virgo and farther clusters, as well as the magnitude limited samples involving various methods of determining distances by different observers, is 73 km S-i Mpcl . Taking into account the error in the calibration of our DM of Virgo we can set a generous error of 10 to this value of H.

scholarly journals Ensuring of Professional and Ecological Electromagnetic Safety: Problems, State and Solutions

2016 ◽  
Vol 5 (4) ◽  
pp. 45-50 ◽  
Author(s):  
Перова ◽  
S. Perova ◽  
Походзей ◽  
L. Pokhodzey ◽  
Пальцев ◽  
...  
Keyword(s):  
Electromagnetic Fields ◽  
Natural Environment ◽  
Control Methods ◽  
Health Loss ◽  
Time Distance ◽  
Electromagnetic Pollution ◽  
And Control

Assurance of workers and population’s electromagnetic safety represents a big relevance in connection with the increasing electromagnetic pollution both of in-plant and natural environment and increase with respect thereto in risk of health loss. Implementation of the principles for protection against electromagnetic fields (EMF) can be not always realized in practice by time, distance, and application of collective and individual means of protection. The question of human being’s protection against EMF has a high relevance especially in connection with potential carcinogenicity of some ranges and modes for EMF generation. Relevance of enhancement of hygienic standards and control methods for EMF, especially taking into account determination of values not only for falling energy, but for the absorbed one, has been demonstrated. The developed modern principle for solution of the problem related to adequate assessment of EMF exposition using a combination of numerical and experimental dosimetry methods, and investigational studies on animals has been separately considered.

A nuclear method for determination of nitrogen depth distributions in single seeds

1976 ◽  
Vol 27 (5-6) ◽  
pp. 273-277 ◽  
Author(s):  
Bo Sundqvist ◽  
László Gönczi ◽  
IB Koersner ◽  
Ronny Bergman ◽  
Ulf Lindh
Keyword(s):  
Single Seeds ◽  
Nuclear Method ◽  
Depth Distributions
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