| 1. |
- Aad, G, et al.
(författare)
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- 2015
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swepub:Mat__t
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| 2. |
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| 3. |
- Nikiforova, Yulia A., et al.
(författare)
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Crystal structure and phase transitions at high pressures in the superconductor FeSe0.89S0.11
- 2021
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Ingår i: Journal of Alloys and Compounds. - : Elsevier. - 0925-8388 .- 1873-4669. ; 860
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Tidskriftsartikel (refereegranskat)abstract
- We report on the structural phase transitions in the FeSe0.89S0.11 superconductor with T-C = 11 K observed by powder synchrotron X-ray diffraction at high pressures up to 18.5 GPa under compression and decompression modes. It was found that at ambient pressure and room temperature, FeSe0.89S0.11 has a tetragonal structure (space group NM). Under compression, in the region of 10 GPa, a phase transition from the tetragonal into the orthorhombic structure (sp. gr . Pnma) is observed, which persists up to 18.5 GPa. Our results strongly suggest that, at decompression, as the applied pressure decreases to 6 GPa and then is completely removed, most of the sample recrystallizes into the hexagonal phase of the structural type NiAs (sp. gr . P6(3)/mmc). However, the other part of the sample remains in the high pressure orthorhombic phase (sp. gr . Pnma), while the tetragonal phase (sp. gr . P4/n) is not restored. These observations illustrate a strong hysteresis of the structural properties of FeSe0.89S0.11 during a phase transition under pressure. (C) 2020 Elsevier B.V. All rights reserved.
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| 8. |
- Baskakov, A.P., et al.
(författare)
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Complex Heat Transfer in Furnaces with a Circulating Fluidized Bed
- 2001
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Ingår i: Heat Transfer Research. - 1064-2285. ; 37:7-8, s. 343-348
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Tidskriftsartikel (refereegranskat)abstract
- Intensity of heat transfer to screen surfaces in the furnaces with a circulating fluidized bed (CFB) is determined by both radiation and convection of particles. Due to the formation of a thermal boundary layer near the screens the role of radiation decreases and that of convection increases with an increase in concentration of particles in the furnace. Generalization of the data obtained in pilot-full-scale and industrial furnaces with a CFB allowed one to obtain a simple empirical dependence of the furnace-mean coefficient of heat transfer α (W/(m2·K) on the volumetric-mean concentration of particles c (kg/m3): α = 85·c0.3.
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| 9. |
- Baskakov, A.P., et al.
(författare)
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Radiative transfer in circulating fluidized bed furnaces
- 1997
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Ingår i: Powder Technology. - 1873-328X .- 0032-5910. ; 90:3, s. 212-218
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Tidskriftsartikel (refereegranskat)abstract
- Three methods of estimating Ihe effective emissivily of a gas-particle suspension are eoml~ared and the radiative heat transfer coefficientof an isothermal suspension is defined. Heat flux measurements obtained from circulating fluidized bed comhustors are examined. Radiationfrom a particle suspension with core temperature dominates the radiative heat transfer in the upper part of the furnace, where the particledensity is low and no substantial particle boundary layers are formed. Over the lower pails of the heat transfer surfaces, where significantthermal and particle boundary layers are present, the radiative heat flux is dominated by emission from the relatively low temperature particlelayer in the vicinity of the heat receiving surface.
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