Experimental Study on Compatibility of Eco-Friendly Insulating Medium C5F10O/CO2 Gas Mixture With Copper and Aluminum

A small portable chamber for the recovery of anaerobic bacteria is described. This rigid chamber is constructed of clear acrylic with dimensions of 30 inches (ca. 76.2 cm) wide, 18 inches (ca. 44.7 cm) deep, and 18 inches (ca. 44.7 cm) high. Conventional bacteriological techniques can be used inside the chamber to efficiently isolate strict anaerobic organisms. An adapter allows the attachment of a standard anaerobic jar to the outside of the chamber. The jar can be used to store reduced media. Once the jar is attached to the chamber and the media is removed to the interior of the chamber, the jar is available to receive inoculated media. The anaerobic jar can then be removed from the chamber, without contaminating the jar or chamber with oxygen, and be placed in a conventional 37degreesC incubator. This chamber also allows the microbiologist to process cultures without wearing gloves as was necessary with previous anaerobic chambers. Air-tight latex rubber sleeves seal around the microbiologists arms and to the armport flange of the chamber to prevent the introduction of oxygen into the chamber. Anaerobic conditions are maintained by circulating a 80% N2, 10% H2, 10% CO2 gas mixture through alumina pellets coated with palladium. This study indicates that anaerobic conditions obtained in this chamber are sufficient for recovery of obligate anaerobes.

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Investigation of N2-Composition in CO2 Gas Mixture for EOR Purpose

Saint Petersburg 2018 ◽

10.3997/2214-4609.201800139 ◽

2018 ◽

Author(s):

E. Ghanaatpisheh Senani ◽

H. Behmanesh ◽

S. Kord ◽

S. Bairamzadeh

Keyword(s):

Gas Mixture ◽

Co2 Gas

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AC Volume Breakdown and Surface Flashover of a 4% NovecTM 4710/96% CO2 Gas Mixture Compared to CO2 in Highly Nonhomogeneous Fields

Energies ◽

10.3390/en13071710 ◽

2020 ◽

Vol 13 (7) ◽

pp. 1710 ◽

Cited By ~ 1

Author(s):

Houssem Eddine Nechmi ◽

Mohammed El Amine Slama ◽

Abderrahmane (Manu) Haddad ◽

Gordon Wilson

Keyword(s):

Electrical Strength ◽

Gas Mixture ◽

Nonlinear Behaviour ◽

Co2 Gas ◽

Surface Flashover ◽

Surface Finishes ◽

Needle Position ◽

Flashover Voltage ◽

Solid Insulator ◽

Solid Dielectrics

AC pre-discharge currents, breakdown, and flashover voltage measurements are reported in a 10 mm needle-plane arrangement in a 4% NovecTM 4710/96% CO2 gas mixture and compared with CO2 for pressures up to 8.8 bar abs. Flashover measurements were performed on different solid dielectrics (Al2O3_filled epoxy resins, PTFE (Polytetrafluoroethylene) and PE (polyethylene)) for different roughness surface finishes. The effect of fixed conducting needles at various positions on electrical strength is reported. A strong nonlinear behaviour as function of gas pressure was observed for all the studied parameters (gas, needle position, solid insulator, insulator roughness). The non-linear behaviour is attributed to the inception and quenching of glow corona, in the interval between inception and breakdown or flashover voltages. It is found that a 4% concentration of NovecTM 4710 in CO2 has a breakdown/flashover voltage ≈ 1.14 higher than CO2. The glow corona-induced stabilization effect is seen for pressures between 2 and 5 bar abs for all the studied parameters. The peak flashover voltage and its associated pressure of the different insulators are strongly dependent on surface roughness. At 8.8 bar abs, the flashover voltage level obtained with various materials was ordered as follows: PTFE > PE-UHMW > Epoxy > HDPE(High-density polyethylene).

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ENDOTHELIUM-INDEPENDENT PARTIAL AGONISTIC ACTIVITY OF VASOPRESSIN IN THE RAT COMMON CAROTID ARTERY

10.1055/s-0038-1644600 ◽

1987 ◽

Author(s):

Z S Katušić ◽

M K Krstić

Keyword(s):

Carotid Artery ◽

Common Carotid Artery ◽

Contact Time ◽

Partial Agonist ◽

Isometric Tension ◽

Gas Mixture ◽

Peripheral Arteries ◽

Co2 Gas ◽

Canine Basilar Artery ◽

Agonistic Activity

It has been shown that vasopressin causes endothelium-dependent relaxations of the canine basilar artery, suggesting that_increased circulating concentrations of vasopressin can produce redistribution of the blood from the peripheral to the cerebral circulation (Katušić et al., 1984). The present experiments were done to examine effect of vasopressin on the rat peripheral arteries* The experiments were performed on rings (4 mm long) of aorta, common carotid and renal arteries* The arteries were placed in Krebs-Ringer-bicarbonate solution gassed with 95%O2-5%co2 gas mixture and kept at 37°c. In certain rings the endothelium was removed mechanically by gentle rubbing of the intimal surface. Isometric tension was continously recorded (IPM electronic).Vasopressin (10-11 to 3×10-8 M) caused concentration-dependent contraction being full agonist in aorta and renal artery, but partial agonist in common carotid artery. After removal of endothelium vasopressin-induced contractions were not significantlly afected in any of the tested arteries. Gyclooxygenase inhibitor indomethacin (10-5 M; contact time = 40 min) did not affect partial agonistic activity of vasopressin in common carotid artery. This results indicate that partial agonistic activity of vasopressin in common carotid artery is not related to increased production of "EDRF" or prostacyclin from endothelium. In addition, our findings are consistent with the hypothesis that vasopressin may contribute to redistribution of the blood flow from the peripheral to the cerbral circulation.Z.S. Katušić, J.T. Shepherd and P.M. Vanhoutte. Circ. Res., 55: 575-579, 1984

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