Creation of a transonic region by means gas fuel burning in supersonic flow with Mach number M = 2 channel variable cross section is studied numerically. The averaged Navier – Stokes equations closed the k-ε model turbulence are solved. created using gas-dynamic pulses throttling jet, which initiates gaseous combustion constant section. (ethylene or kerosene) supplied axially into axisymmetric ...

This paper investigates the influence of voltage dips on large electric driven gas compressors (EDC) considering a typical application in the oil and gas industry. Voltage or power dips are electric disturbances encountered in EDC which are mainly caused by faults in the electrical grid and might last for durations up to 150ms. For gas compression applications, the loss of driver torque often p...

Dynamics of ethylene autoignition and deflagration-to-detonation transition (DDT) are first numerically investigated in a one-dimensional shock tube using reduced chemistry including 10 species reactions. Different combustion modes through considering various premixed gas equivalence ratios (0.2 [Formula: see text] 2.0) incident wave Mach numbers (1.8[Formula: text]3.2). Four ignition DDT obser...

Ethylene, abscisic acid, and cytokinins were tested for their ability to either induce or prevent the changes which occur in gas exchange characteristics of tomato (Lycopersicon esculentum Mill. cv. Rheinlands Ruhm) leaves during short-term soil flooding. Ethylene, which increases in the shoots of flooded plants, had no effect on stomatal conductance or photosynthetic capacity of drained plants...

Ethylene is one of the simplest organic molecules with biological activity. Its effects on plant tissue are spectacular and commercially important (1, 2). This hydrocarbon gas is generally considered to be the fruit-ripening hormone (2, 3). Because of its effects on plant senescence, large losses of fruits and vegetables are incurred annually in the United States. The losses are much greater in...

Although sterilization by steam under pressure and by hot air are procedures which are now well understood and efficient when properly conducted, there is an increasing number of objects in medical or surgical use which are too heat labile to be so treated. It is for such items as plastic catheters, disposable plastic syringes, and prostheses that ethylene oxide has been proposed as a convenien...

Gas and vapor transport properties were studied in mixed matrix membranes containing elastomeric ethylene-octene copolymer (EOC or poly(ethylene-co-octene)) with three types of carbon fillers: virgin or oxidized multi-walled carbon nanotubes (CNTs) and carbon fibers (CFs). Helium, hydrogen, nitrogen, oxygen, methane, and carbon dioxide were used for gas permeation rate measurements. Vapor trans...

Ab initio molecular orbital theory has been used to study the formation and reactions of the sulfursulfur hemibonded dimer radical cation of thiirane. Two fragmentation pathways, hemibond cleavage and ethylene extrusion, leading to the fragmentation of this species have been examined. The barriers to these processes are found to be similar and moderately large (127 and 160 kJ mol-', respectivel...

Mono-, di-, tri-, and tetraethylene glycols and polyethylene glycols (PEG) with molecular weight up to 20,000 were degraded by soil microorganisms. A strain of Pseudomonas aeruginosa able to use a PEG of average molecular weight 20,000 was isolated from soil. Washed cells oxidized mono- and tetraethylene glycols, but O2 consumption was not detectable when such cells were incubated for short per...

AIM The present study was undertaken to estimate the current status of residues of organochlorine pesticides (OCPs), organophosphates (OPs) and synthetic pyrethroids (SPs) pesticides in human blood. MATERIALS AND METHODS Human blood samples were analyzed by gas chromatography and confirmed by gas chromatography-mass spectrometry in selective ion monitoring mode. RESULTS The gas chromatograp...