Gas reservoirs with low permeability (k<0.1 mD) are among the unconventional reservoirs and are commonly termed as "Tight Gas Reservoirs". In conventional gas reservoirs that have high permeability, the flow of gas is basically controlled by the reservoir permeability and it is calculated using the Darcy equation. In these reservoirs, gas flow due to gas diffusion is ignored compared to Dar...

The provision of positive end expiratory pressure, via a unique portable system, in the long term management of a child with thoracic dystrophy is reported. The system uses low gas flow enabling a reduction in equipment and simplification of the circuit as compared with a standard continuous positive airways pressure system.

In this paper, we present a 2D axisymmetric plasma fluid model for microwave plasmas operating in argon. The effect of the pressure on the plasma parameters is studied over a wide range of pressures going from 10 mbar to atmospheric pressure. The model shows that the discharge contracts with the increase of gas pressure. Additionally, a first reduction of the CO2 chemistry set of [11,12] from 1...

Benzene is a ubiquitous environmental pollutant and an important industrial chemical present in both gasoline and motor vehicle emissions. Occupational human exposure to benzene occurs in the petrochemical and petroleum refining industries as well as in gas-station workers, where it can lead to benzene poisoning (BP), but the mechanisms of BP are not completely understood. In Brazil, a signific...

co2/ch4 gas separation is a very important applicatable process in upgrading the natural gas and landfil gas recovery. in this work, to investigate the membrane separation process performance, the gas permeation results andco2/ch4 separation characteristics of different prepared membranes (via blending different molecular weights of polyethylene glycol (peg) as a modifier with acrylonitrile-but...

Carbon dioxide flooding is considered to be one of the most effective enhanced oil recovery methods for the light oil reservoirs. Depending on the operating pressure, the process might be miscible or immiscible. Minimum miscibility pressure (MMP) is the most important parameter for assessing the applicability of any miscible gas flood for an oil reservoir. The miscibility condition is determine...

The one dimension computational model of a sequential injection engine, which runs on compressed natural gas (CNG) with spark ignition, is developed for this study, to simulate the performance of gas flow pressure profile, under various speed conditions. The computational model is used to simulate and study of the steady state and transient processes of the intake manifold. The sequential injec...

Hydrates are crystalline compounds similar to ice, with guest molecules like methane and ethane trapped inside cavities or cages formed by the hydrogen bounded framework of water molecules. These solid compounds give rise to problems in the natural gas oil industry because they can plug pipelines and process equipments. Low dosage hydrate inhibitors are a recently developed hydrate control tech...

Self-employment is increasing among seniors. The percentage of individuals age 62 and over who were self-employed increased from 4.2 percent in 1988 to 5.4 percent in 2015. In contrast, the percentage of individuals under age 62 who were self-employed decreased from 7.2 percent in 1988 to 6.0 percent in 2015. This report explains the increase in self-employment among individuals age 62 and over...