THE VAPOR DENSITY OF SELENIUM TETRABROMIDE AND THE EXISTENCE OF SELENIUM DIBROMIDE

1931 ◽  
Vol 53 (7) ◽  
pp. 2549-2553 ◽  
Author(s):  
Don M. Yost ◽  
John B. Hatcher
Keyword(s):  
Vapor Density ◽  
Selenium Dibromide ◽  
Selenium Tetrabromide

scholarly journals Estimating Water Vapor Using Signals from Microwave Links below 25 GHz

2021 ◽  
Vol 13 (8) ◽  
pp. 1409
Author(s):  
Kun Song ◽  
Xichuan Liu ◽  
Taichang Gao ◽  
Peng Zhang
Keyword(s):  
Water Vapor ◽  
Weather Forecasting ◽  
Water Cycle ◽  
Correlation Coefficients ◽  
Support Vector ◽  
Vapor Density ◽  
Measurement Resolution ◽  
Sensing Model ◽  
Numerical Weather Forecasting ◽  
Mean Square Errors

Water vapor is a key element in both the greenhouse effect and the water cycle. However, water vapor has not been well studied due to the limitations of conventional monitoring instruments. Recently, estimating rain rate by the rain-induced attenuation of commercial microwave links (MLs) has been proven to be a feasible method. Similar to rainfall, water vapor also attenuates the energy of MLs. Thus, MLs also have the potential of estimating water vapor. This study proposes a method to estimate water vapor density by using the received signal level (RSL) of MLs at 15, 18, and 23 GHz, which is the first attempt to estimate water vapor by MLs below 20 GHz. This method trains a sensing model with prior RSL data and water vapor density by the support vector machine, and the model can directly estimate the water vapor density from the RSLs without preprocessing. The results show that the measurement resolution of the proposed method is less than 1 g/m3. The correlation coefficients between automatic weather stations and MLs range from 0.72 to 0.81, and the root mean square errors range from 1.57 to 2.31 g/m3. With the large availability of signal measurements from communications operators, this method has the potential of providing refined data on water vapor density, which can contribute to research on the atmospheric boundary layer and numerical weather forecasting.

scholarly journals Reaction of selenium dibromide with divinyl sulfide

2009 ◽  
Vol 79 (1) ◽  
pp. 161-161 ◽  
Author(s):  
S. V. Amosova ◽  
M. V. Penzik ◽  
A. I. Albanov ◽  
V. A. Potapov
Keyword(s):  
Divinyl Sulfide ◽  
Selenium Dibromide

Mechanism of the cyclization of dimethyl diethynyl silane with selenium tetrabromide: Computational and structural studies, and monitoring

2007 ◽  
Vol 692 (16) ◽  
pp. 3307-3315 ◽  
Author(s):  
Svetlana V. Amosova ◽  
Vladimir A. Shagun ◽  
Alexander V. Martynov ◽  
Natalia A. Makhaeva ◽  
Lyudmila I. Larina ◽  
...  
Keyword(s):  
Structural Studies ◽  
Selenium Tetrabromide

scholarly journals X-ray specular-reflectivity study of the liquid-vapor density profile ofHe4

1993 ◽  
Vol 48 (13) ◽  
pp. 9644-9659 ◽  
Author(s):  
L. B. Lurio ◽  
T. A. Rabedeau ◽  
P. S. Pershan ◽  
Isaac F. Silvera ◽  
M. Deutsch ◽  
...  
Keyword(s):  
Density Profile ◽  
Vapor Density ◽  
X Ray ◽  
Specular Reflectivity ◽  
Liquid Vapor

Nature of selenium tetrabromide in nonaqueous solvents

1969 ◽  
Vol 8 (4) ◽  
pp. 759-762 ◽  
Author(s):  
Nicolaos Katsaros ◽  
John W. George
Keyword(s):  
Nonaqueous Solvents ◽  
Selenium Tetrabromide

scholarly journals Liquid-vapor density profile of helium: An x-ray study

1992 ◽  
Vol 68 (17) ◽  
pp. 2628-2631 ◽  
Author(s):  
L. B. Lurio ◽  
T. A. Rabedeau ◽  
P. S. Pershan ◽  
Isaac F. Silvera ◽  
M. Deutsch ◽  
...  
Keyword(s):  
Density Profile ◽  
Vapor Density ◽  
X Ray ◽  
Liquid Vapor

An improvement of the vapor density experiment in the general chemistry course

1970 ◽  
Vol 47 (5) ◽  
pp. 390
Author(s):  
Robert Seiwald ◽  
Thomas Gruhn ◽  
Mel Gorman
Keyword(s):  
General Chemistry ◽  
Vapor Density
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