22 research outputs found
Plasmagasdynamic experiments in Russia and prospects of plasma technology applications in aerodynamics
The investigations in the field of a plasma gas dynamics performed by MRTI RAS and other organizations during last 20 years are considered. The following experimental schemes were used: probing of discharge plasma by a sound, weak shock wave and strong shock wave, including experiments on shock tubes, body flight through plasma region in ballistic stand, a flow around a body in the wind tunnels provided by section with plasma discharge, etc. The direct current sources, the high-frequency and microwave generators were used for creation of plasma. The results of the experiments are considered and the positive conclusions about prospect of use of the plasma technology in aerodynamics are done
Ignition and combustion of air/fuel mixture in a long tube induced by microwave subcritical streamer discharge
Plasma-assisted ignition and combustion of lean and rich air/fuel mixtures in low- and high-speed flows
Ignition of lean and stoichiometric air–propane mixture with a subcritical microwave streamer discharge
Test Cell for Study of Plasma Formations Effect on Ignition and Combustion Stabilization
Changes in the volume and salinity of Lake Khubsugul (Mongolia) in response to global climate changes in the upper Pleistocene and the Holocene
Two gravity cores (1.1 and 2.2 m long) of deep-water bottom sediments from Lake Khubsugul (Mongolia) were studied. The Holocene, biogenic silica and organic matter-rich part of the first core was subjected to AMS radiocarbon dating which placed the date of dramatic increase of pelagic diatoms (40 cm below sediment surface) at a calendar age of 11.5 cal ky BP. ICP-MS analysis of weak nitric acid extracts revealed that the upper Pleistocene, compared to the Holocene samples, were enriched in Ca, Cinorg, Sr, Mg and depleted of U, W, Sb, V and some other elements. Transition to the Holocene resulted in an increase of total diatoms from 0 to 108 g-1, of BiSi from 1% to 20%, of organic matter from 6%. The Bølling–Allerød–Younger Dryas–Holocene abrupt climate oscillations manifested themselves in oscillations of geochemical proxies. A remarkable oscillation also occurred at 22 cm (ca. 5.5 ky BP). The Pleistocene section of the second, longer core was enriched in carbonate CO2 (up to 10%) and water-extractable SO42- (up to 300 times greater than that in Holocene pore waters). All this evidence is in an accord with the earlier finding of drowned paleo-deltas at ca. 170 m below the modern lake surface of the lake [Dokl. Akad. Nauk 382 (2002) 261] and suggests that, due to low (ca. 110 mm) regional precipitation at the end of the Pleistocene, Lake Khubsugul was only 100 m deep, and that its volume was ca. 10 times less than today