scholarly journals Radio climatology of Rajasthan

MAUSAM ◽  
2021 ◽  
Vol 42 (1) ◽  
pp. 77-82
Author(s):  
K. P. KULSHRESTHA ◽  
N. K. BHATIA
Keyword(s):  
Vapour Pressure ◽  
Atmospheric Pressure ◽  
Ground Surface ◽  
Radiowave Propagation ◽  
Refractive Indices ◽  
Border Line ◽  
Adjoining Area ◽  
International Border

Based on 30-year averages of the values of atmospheric pressure, temperature and vapour pressure near the ground surface, value's of radio refractive indices for 18 stations of Rajasthan State and adjoining area near and within international border line, have been computed. Using these data, monthly and annual distributions of radio refractive indices over the area for both morning and evening have been describe-d and discussed which may be useful in radiowave propagation in the area.  

XV.—The Densities and Degrees of Dissociation of the Saturated Vapours of the Ammonium Halides

1915 ◽  
Vol 35 ◽  
pp. 162-167
Author(s):  
Alexander Smith ◽  
Robert H. Lombard
Keyword(s):  
Ammonium Chloride ◽  
Vapour Pressure ◽  
Atmospheric Pressure ◽  
Ammonium Halides ◽  
Degrees Of Dissociation

The published determinations of the vapour densities of ammonium chloride are not consistent. Thus the percentage dissociation calculated from the observations at 300° to 323° ranges from 87 to 100; at 350°, from 83 to 100; and at 445°, from 89 to 99. The results also lack quantitative significance because they were nearly all obtained by the Dumas or the V. Meyer method. When the former method was used, the density was that at atmospheric pressure, although the temperature corresponded to a much higher vapour pressure. When the latter method was used, in most cases, for the same reason, the vapour was highly unsaturated. In a few instances the vapour pressure was less than one atmosphere, and the vaporisation could proceed only by diffusion of the vapour into the air contained in the apparatus.

Some experiments on cavities behind disks

1965 ◽  
Vol 23 (4) ◽  
pp. 645-656 ◽  
Author(s):  
G. E. Gadd ◽  
S. Grant
Keyword(s):  
Mathematical Models ◽  
Water Vapour ◽  
Vapour Pressure ◽  
Atmospheric Pressure ◽  
Water Vapour Pressure ◽  
Water Tunnel ◽  
Cavity Pressure ◽  
Qualitative Discussion

Measurements of cavities behind disks in a water tunnel show that at high enough speeds the cavity pressure is not more than 30–40% higher than water-vapour pressure, even when at atmospheric pressure the tunnel water is nearly saturated with air. No other hard conclusions can be drawn from the investigations, which showed many puzzling features, discussed below. It is hoped, however, that the qualitative discussion may prove useful to theoreticians who may seek to improve existing mathematical models of cavitation by taking a more realistic account of the physics of the flow.

scholarly journals Atmospheric pressure and refractive indices, with a corresponding table of indices of optical glass

1922 ◽  
Vol 100 (707) ◽  
pp. 621-626
Keyword(s):  
Atmospheric Pressure ◽  
Optical Glass ◽  
Vitreous Silica ◽  
Great Accuracy ◽  
Mean Value ◽  
Decimal Place ◽  
Refractive Indices ◽  
Temperature Coefficients ◽  
The Mean ◽  
Temperature Errors

A new method of obtaining refractive index was described in 1902. Instead of depending on the accuracy of arbitrary measurements of refracting angle or the accuracy of construction of a prism, this method was based on the mean value of the three angles of a triangle. The description of this method was accompanied by a Table of the principal refractive indices of quartz, calcite, and fluorite, obtained in this manner, and was followed later by similar Tables of the refractive indices of vitreous silica, water, and optical glass, and in February, 1915, these were in turn followed by a Table of the refraction temperature coefficients of optical glass. Since the error due to the method itself amounted to less than unity in the seventh figure, there was promise of great accuracy. But, nevertheless, with every care, and in spite of the correction for temperature, errors even exceeding unity in the fifth decimal place were frequently manifest, requiring repeated and tedious observation to eliminate. Hence suspicion fell on the barometer. But it was pointed out by the late Prof. Sylvanus Thompson, F. R. S., and afterwards by Sir Arthur Schuster, who indicated the lines to be worked on, that the modulus of rigidity of glass precluded its being sensibly affected by atmospheric pressure, and that, therefore, any such effect must be due to the refraction of air alone.

scholarly journals Densities, Viscosities and Refractive Indices of Ternary System Cyclohexane + Cyclohexanol + Cyclohexanone at 293.15, 298.15 and 303.15 K

2019 ◽  
Vol 70 (4) ◽  
pp. 1204-1209
Author(s):  
Maria Magdalena Budeanu ◽  
Vasile Dumitrescu
Keyword(s):  
Refractive Index ◽  
Ternary System ◽  
Linear Equation ◽  
Viscous Flow ◽  
Atmospheric Pressure ◽  
Composition Range ◽  
Refractive Indices ◽  
Mixing Rules ◽  
Experimental Values

Densities (r), viscosities (h) and refractive indices (nD) of the ternary system cyclohexane + cyclohexanol + cyclohexanone were measured at 293.15, 298.15 and 298.15 K and atmospheric pressure, over the whole composition range. The experimental values of densities and viscosities were correlated with temperature using a linear equation and Guzman equation respectively. Viscosity results were fitted with Grunberg-Nissan equation and Heric-Brewer equation. Different refractive index mixing rules (Arago-Biot, Dale-Glastone, Newton and Lorentz-Lorenz) were studied for this ternary system. The functions of activation of viscous flow were also calculated and their variations with compositions have been discussed.

scholarly journals Some temperature refraction coefficients of optical glass

1915 ◽  
Vol 91 (629) ◽  
pp. 319-321 ◽  
Keyword(s):  
Refractive Index ◽  
Atmospheric Pressure ◽  
Optical Glass ◽  
Refractive Indices ◽  
Temperature Coefficients

In a previous paper, the refractive indices of a number of typical samples of glass were given, but temperature coefficients—although measured—were omitted at the time. The late Sir David Gill having shortly before his death expressed a wish that they should be published, the following paper complies with this desire. In addition a table is given of the refractive indices of glass meltings since measured, together with an account of an attempt to determine, if only approximately, the influence of atmospheric pressure (barometer changes) on measurements of refractive index generally.

scholarly journals Change of refractive indices in ternary mixtures containing chlorobenzene + n-hexane + (n-heptane or n-octane) at 298.15 K

2004 ◽  
Vol 69 (6) ◽  
pp. 461-475 ◽  
Author(s):  
A. Touriño ◽  
M. Hervello ◽  
V. Moreno ◽  
G. Marino ◽  
M. Iglesias
Keyword(s):  
Atmospheric Pressure ◽  
Composition Dependence ◽  
Equations Of State ◽  
Ternary Mixtures ◽  
Fluid Mixing ◽  
Refractive Indices ◽  
Polynomial Equations ◽  
Composition Diagram ◽  
Derived Properties ◽  
Semi Empirical

The refractive indices of ternary mixtures of chlorobenzene + n-hexane (n-heptane or n-octane) have been measured at 298.15 K and at atmospheric pressure over the whole composition diagram. Parameters of polynomial equations which represent the composition dependence of physical and derived properties are gathered. The experimental refractive indices and the ternary derived properties are compared with the data obtained using several predictive semi-empirical models. The use of the Soave?Redlich?Kwong (SRK) and the Peng?Robinson (PR) cubic equations of state with the Van der Waals one-fluid mixing rule, which incorporate different combining rules to predict refractive indices on mixing, are tested against the measured results, good agrement being obtained.

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