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Малышев, В. В.; Uskova, N. N.

doi:10.1023/a:1021974604423

Cited by 3 publications

(6 citation statements)

References 1 publication

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“…Previous 19.9 GHz methanol maser observations suggest that star formation regions with centimetre radio continuum emission and 6.035 GHz excited OH masers may be more likely to host rare, weak methanol masers , and we observed all sources south of declination 0 • meeting these criteria (sample B in Table 1, 26 sources in total). The final sample was a search towards all 6.7 GHz methanol masers with a peak flux density > 75 Jy, north of a declination of -15 • in the catalogue of Malyshev & Sobolev (2003) Table 1, 17 sources). Due to time constraints G 30.70 − 0.07 and G 31.28 + 0.06 (nominally members of sample C were not observed), while ON1 and DR21(OH) were observed despite not meeting the flux density criteria due to the small number of target sources in that LST range.…”

Section: Observationsmentioning

confidence: 99%

37 GHz METHANOL MASERS : HORSEMEN OF THE APOCALYPSE FOR THE CLASS II METHANOL MASER PHASE?

Ellingsen

Breen

Соболев

et al. 2011

ApJ

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We report the results of a search for class II methanol masers at 37.7, 38.3 and 38.5 GHz towards a sample of 70 high-mass star formation regions. We primarily searched towards regions known to show emission either from the 107 GHz class II methanol maser transition, or from the 6.035 GHz excited OH transition. We detected maser emission from 13 sources in the 37.7 GHz transition, eight of these being new detections. We detected maser emission from three sources in the 38 GHz transitions, one of which is a new detection. We find that 37.7 GHz methanol masers are only associated with the most luminous 6.7 and 12.2 GHz methanol maser sources, which in turn are hypothesised to be the oldest class II methanol sources. We suggest that the 37.7 GHz methanol masers are associated with a brief evolutionary phase (of 1000-4000 years) prior to the cessation of class II methanol maser activity in the associated high-mass star formation region.

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Section: Observationsmentioning

confidence: 99%

37 GHz METHANOL MASERS : HORSEMEN OF THE APOCALYPSE FOR THE CLASS II METHANOL MASER PHASE?

Ellingsen

Breen

Соболев

et al. 2011

ApJ

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“…Oxide tungstate-molybdate Na 2 WO 4 -MO 3 (M=Mo or W) melts have been used earlier [15,16] in electroplating molybdenum (tungsten) coatings. In such melts, as was found in [10], the deposition potentials of molybdenum (tungsten) are more negative than that of nickel. The same relation may obviously be expected in the case of cobalt.…”

mentioning

confidence: 56%

“…Experiments were carried out in air atmosphere in a quartz reactor. The design of electrochemical cell, preparation of reagents, methods of monitoring and estimating the kinetic parameters of the electrode process were described in [10]. The reference electrode was a platinum-oxygen electrode, namely, a Pt wire immersed in a 80 mol% Na 2 WO 4 -20 mol% WO 3 melt and blown round with air in a cell provided with an alundum diaphragm.…”

Section: Experimental Partmentioning

confidence: 99%

“…The literature has many studies on electrodeposition of metalic Mo, W, Co and Co-Mo alloys from ionic media. [1][2][3][4][5][6][7][8][9] Electrochemical behavior of nickel as well as electroplating of nickel-molybdenum (tungsten) alloys from oxide tungstate-molybdate nickelcontaining melts was studied in our previous work [10]. In the earlier works [11][12][13], common regularities of codeposition of iron family metals with titanium from halide melts were found.…”

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confidence: 99%

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Electroplating of Co-W and Co-Mo Alloys from Na2WO4 Ionic Melts

Малышев¹,

Gab²,

Survila³

et al. 2019

Rev. Chim.

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The cathodic reduction processes of cobalt (II), tungsten (VI) and molybdenum (VI) in Na2WO4 melts are discussed. Electrochemical behavior of cobalt in a tungstate melt, as well as the effect of electrolysis conditions on the composition and structure of Co-W and Co-Mo alloys deposits from tungstate-molybdate melts is also studied. With a decrease in the concentration of cobalt ions and an increase in the concentration of molybdenum (tungsten) ions in the melt, the phase composition of cathodic deposits is shown to change from individual cobalt to individual molybdenum (tungsten) via a series of cobalt-molybdenum (tungsten) compounds of various compositions.

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“…This group includes a lot of techniques [9][10][11][12], 4) chemical desintegration (oxidation-reductioncarbidization) [3,13,14].…”

Section: Introductionmentioning

confidence: 99%

Regeneration of Hard Alloy Wastes by Low Energy Consumption and Environmentally Friendly Hydrothermal Technology

Korablov

2015

PCSS

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Hard alloys are indispensable material for many branches of modern industry. However, even with the base composition (WC-Co) they are quite expensive due to the limited natural resources of cobalt and the complexity of their production from the minerals. Therefore, the collection and recycling of hard alloys waste have not only scientific but practical importance, taking into account that the cost of production of 1 ton of alloy from recovered waste comes to 20% cheaper than in the core technology. Existing methods of hard alloys waste treatment have several disadvantages, the main of which are high power consumption and big load on the environment. As a result of this research a high-performance, low-energy consumption, eco-friendly way for recycling of hard alloys waste has been proposed. According to this technology, in a first step the WC powder, and the solution containing cobalt salts were obtained by autoclaving at 230 °C in a mixture of HCl-H 3 PO 4 -HNO 3 acids, and followed then metal cobalt recovery from hydrothermal solution at temperatures of 110 -160 °C.

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Cited by 3 publications

References 1 publication

37 GHz METHANOL MASERS : HORSEMEN OF THE APOCALYPSE FOR THE CLASS II METHANOL MASER PHASE?

37 GHz METHANOL MASERS : HORSEMEN OF THE APOCALYPSE FOR THE CLASS II METHANOL MASER PHASE?

Electroplating of Co-W and Co-Mo Alloys from Na2WO4 Ionic Melts

Regeneration of Hard Alloy Wastes by Low Energy Consumption and Environmentally Friendly Hydrothermal Technology

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