Diffusivity of Multicomponent Gas Mixtures in Polyethylene

2021 ◽  
pp. 2100406
Author(s):  
Amel Ben Mrad ◽  
Nida Sheibat‐Othman ◽  
Sina Valaei ◽  
Michael Bartke ◽  
Timothy F. L. McKenna
Keyword(s):  
Gas Mixtures ◽  
Multicomponent Gas

scholarly journals Экспериментальная установка на базе перестраиваемого в диапазоне волн 5.3-12.8 μm квантово-каскадного лазера для спектрального анализа выдыхаемого человеком воздуха

2021 ◽  
Vol 129 (6) ◽  
pp. 747
Author(s):  
А.В. Щербакова ◽  
Д.Р. Анфимов ◽  
И.Л. Фуфурин ◽  
И.С. Голяк ◽  
И.А. Трапезникова ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Peak Power ◽  
Gas Mixtures ◽  
Sensitivity Threshold ◽  
Gas Cell ◽  
Single Spectrum ◽  
Quantum Cascade ◽  
Exhaled Air ◽  
Multicomponent Gas ◽  
Ppm Level

An experimental setup and a method for analyzing multicomponent gas mixtures, including human exhaled air, are presented. The installation consists of a quantum cascade laser, tunable in the wavelength range of 5.3-12.8 µm, with a peak power of 150 mW, and a multi-pass Herriot gas cell, which allows obtaining an optical path of up to 76 m. The registration time of a single spectrum is about 50 ms. For acetone and ethanol, which are potential biomarkers of some human diseases, the sensitivity threshold at the sub-ppm level was experimentally determined. A system of sample preparation and pre-drying is proposed, which allows analyzing both multicomponent gas mixtures and the air exhaled by a person. The variants of application of the described installation in biomedical applications are proposed.

scholarly journals Molecular Simulations of CO2/CH4, CO2/N2 and N2/CH4 Binary Mixed Hydrates

2021 ◽  
Vol 83 (3) ◽  
pp. 372-378
Author(s):  
A. A. Sizova ◽  
S. A. Grintsevich ◽  
M. A. Kochurin ◽  
V. V. Sizov ◽  
E. N. Brodskaya
Keyword(s):  
Carbon Dioxide ◽  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Gas Hydrates ◽  
Molecular Simulations ◽  
Gas Mixtures ◽  
Gas Mixture ◽  
Grand Canonical Monte Carlo ◽  
Multicomponent Gas ◽  
Grand Canonical

Abstract Grand canonical Monte Carlo simulations were performed to study the occupancy of structure I multicomponent gas hydrates by CO2/CH4, CO2/N2, and N2/CH4 binary gas mixtures with various compositions at a temperature of 270 K and pressures up to 70 atm. The presence of nitrogen in the gas mixture allows for an increase of both the hydrate framework selectivity to CO2 and the amount of carbon dioxide encapsulated in hydrate cages, as compared to the CO2/CH4 hydrate. Despite the selectivity to CH4 molecules demonstrated by N2/CH4 hydrate, nitrogen can compete with methane if the gas mixture contains at least 70% of N2.

Role of Spectral Line Profile in Laser IR Analysis of Multicomponent Gas Mixtures

2019 ◽  
Vol 13 (5) ◽  
pp. 727-738
Author(s):  
Sh. Sh. Nabiev ◽  
S. V. Ivanov ◽  
A. S. Lagutin ◽  
L. A. Palkina ◽  
S. V. Malashevich ◽  
...  
Keyword(s):  
Spectral Line ◽  
Line Profile ◽  
Gas Mixtures ◽  
Multicomponent Gas ◽  
Spectral Line Profile ◽  
Ir Analysis
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