scholarly journals On the refractive indices of gaseous nitric oxide, sulphur dioxide, and sulphur trioxide

1908 ◽  
Vol 80 (540) ◽  
pp. 406-410 ◽  
Keyword(s):  
Nitric Oxide ◽  
White Light ◽  
Sulphur Dioxide ◽  
Ferrous Sulphate ◽  
Refractive Indices ◽  
Sulphur Trioxide

Dufet only records two determinations of the index of nitric oxide: that of Dulong, who found 1.000302 for white light, and that of Mascart, who gives, for sodium light, 1.0002975, taking air as 1.0002928. The latter states that the gas he used contained about 10 per cent, of gas not absorbable by ferrous sulphate, for which allowance was made; but the analysis was not very accurate. As the index is abnormally high, and methods of purifying gases have improved since 1877, it seemed desirable to repeat the determination.

The absorption spectrum of SO and the flash photolysis of sulphur dioxide and sulphur trioxide

1959 ◽  
Vol 249 (1259) ◽  
pp. 498-512 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Dissociation Energy ◽  
Sulphur Dioxide ◽  
Flash Photolysis ◽  
Ultra Violet ◽  
Vibrationally Excited ◽  
A Value ◽  
Continuous Absorption ◽  
Sulphur Trioxide ◽  
Normal Spectrum

The flash photolysis of sulphur dioxide under adiabatic conditions results in the complete temporary disappearance of its spectrum , which then slowly regains its original intensity over a period of several milliseconds. Simultaneously with the disappearance of the sulphur dioxide spectrum a continuous absorption appears in the far ultra-violet and fades slowly as the sulphur dioxide reappears. It is shown that the effect of the flash is thermal rather than photochemical, and the possibility of the existence of an isomer of sulphur dioxide at high temperatures is discussed; the disappearance of the normal spectrum on flashing is explained in this way. Several previously unrecorded bands of SO observed in the photolysis indicate that the vibrational numbering of its spectrum should be revised by the addition of 2 to the present values of v' . This leads to a value of the dissociation energy of 123.5 kcal. In formation about the levels v' = 4, 5 and 6 has also been obtained. The isothermal flash photolysis of sulphur trioxide results in the appearance of vibrationally excited SO, and the primary photochemical step in this reaction is discussed.

scholarly journals Light scattering of glass-particle filled matrices with similar refractive index

2018 ◽  
Vol 52 (30) ◽  
pp. 4231-4246 ◽  
Author(s):  
Wolfgang Wildner ◽  
Dietmar Drummer
Keyword(s):  
Refractive Index ◽  
Light Source ◽  
White Light ◽  
Scattered Light ◽  
Glass Particle ◽  
Refractive Indices ◽  
Mechanical And Thermal Properties ◽  
White Light Source ◽  
Transmission Measurements ◽  
Optical Appearance

If fillers can be added to transparent materials without losing transparency, then advantages like enhanced mechanical and thermal properties can be integrated. The investigated specimens consist of glass particles and refractive index oil as a model for transparent matrices with a very similar refractive index. Their optical properties and resulting limitations are described. Potential uses are also demonstrated by application-oriented optical testing. Besides a standard spectrometer, additional spectrometer setups were used. These include a diffuse as well as a collimated illumination and different sample positioning. Furthermore, the scattered light intensity was measured at different angles. This analysis reveals that composites with smaller particles transmit more light directly. In contrast, standard spectrometers indicate an increasing direct transmittance of composites with larger particles. They collect significant amounts of scattered light and, therefore, are not suitable for transmission measurements of such composites. The different positioning shows that all specimens exhibit very little scattering when placed directly on a diffuse light source. With a greater distance between specimen and light source, the scattering increases strongly. To display the composites' optical appearance, the light-dark-contrast of the diffuse white light source photographed behind the composite was analyzed. Both long and short distances between composite and light source lead to a precise image of the light source. Nevertheless, the white light source appears in the color of the wavelength with matching refractive indices at long distances.

scholarly journals Reaction Mechanism of Formation of CaSO4 in AFBC

1970 ◽  
Vol 41 (3) ◽  
pp. 167-170
Author(s):  
Ismat Ali ◽  
M Mohsin Ali
Keyword(s):  
Reaction Mechanism ◽  
Nitrogen Content ◽  
Fluidized Bed ◽  
Sulphur Dioxide ◽  
Calcium Sulphate ◽  
Mechanism Of Formation ◽  
Sulphur Trioxide ◽  
Fluidized Bed Combustor

Attempts have been made to investigate and predict the reaction mechanism of formation of calcium sulphate (CaSO4) in Atmospheric Fluidized Bed Combustor (AFBC). Formation of NOx, from nitrogen content to coal has been found beneficial for the oxidation of sulphur dioxide to sulphur trioxide. Bangladesh J. Sci. Ind. Res. 41(3-4), 167-170, 2006

The pressure dependence of refractivity of polar gases

1960 ◽  
Vol 255 (1282) ◽  
pp. 427-433 ◽  
Keyword(s):  
Pressure Dependence ◽  
Sulphur Dioxide ◽  
Experimental Error ◽  
Methyl Chloride ◽  
Molecular Polarizability ◽  
Refractive Indices ◽  
Methyl Fluoride ◽  
Carbon Tetrafluoride ◽  
First Order

The refractive indices of several gases have been measured at varying pressures in the range 0 to 50 cm. For carbon tetrafluoride, methyl fluoride and methyl chloride the refractivity varies directly with the density within the limits of experimental error. For ammonia and sulphur dioxide the increase of refractivity with pressure is less than would correspond to the increase in density. This may be interpreted in terms of a negative ‘first-order hyperpolarizability' for the polar vapours, whose molecular polarizability is being decreased by the influence of the field due to neighbouring molecular dipoles.

scholarly journals Attenuation of angiotensin converting enzyme inhibitor induced cough by iron supplementation: role of nitric oxide

2011 ◽  
Vol 12 (4) ◽  
pp. 491-497 ◽  
Author(s):  
Payal Bhalla ◽  
Narinder Pal Singh ◽  
Krishnan Ravi
Keyword(s):  
Nitric Oxide ◽  
Angiotensin Converting Enzyme ◽  
Angiotensin Converting Enzyme Inhibitor ◽  
Iron Supplementation ◽  
Enzyme Inhibitor ◽  
Ferrous Sulphate ◽  
Control Group ◽  
Converting Enzyme ◽  
Converting Enzyme Inhibitor ◽  
Observation Period

The present study examined whether (1) the cough associated with angiotensin converting enzyme inhibitor therapy is attenuated by oral intake of iron and anti-oxidants, and (2) nitric oxide (NO) has any role in this attenuation. Of the 100 patients under investigation, cough occurred in 28 of them with preponderance in females. All the 28 patients were followed up for six weeks: the first two weeks were the observation period and the remaining four weeks the experimentation period. After the observation period, 11 patients received a single oral dose of ferrous sulphate (200 mg), eight received vitamin E (200 mg, o.d.) and vitamin C (150 mg, o.d.) and nine were given placebo during the experimentation period. Cough scoring, serum NO and malondialdehyde (MDA) levels were determined during both the periods. While there were significant decreases in cough scores, NO and MDA levels between these two periods in the iron group, cough scores and MDA level decreased significantly in the anti-oxidant group. None of these parameters changed in the control group. NO level was found to be increased significantly in patients who developed cough ( n = 28) compared with those who did not cough ( n = 72). These results suggest that iron supplementation suppresses cough in patients on ACE-I therapy through its effect on NO generation.

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