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Effects of Reagent Concentration and Particle Size οn Diffusion Rate of Mixed Ores with Rare Elements

100%
Yang X., Zhang L.
Acta Physica Polonica A
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2013
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vol. 124
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issue 1
66-69
EN
The leaching reaction kinetics of weathered crust elution-deposited rare earth with mixed ammonium salts was studied. The influence of concentration of reagents and particle size of ore on leaching rate was investigated. The results showed that the diffusion process and leaching rate could be improved by increasing reagents concentration and decreasing leaching flowing rate and particle size. The leaching process could be explained with the shrinking core model, which could be controlled by the diffusion rate of reacting reagents in porous solid layer. The leaching rate obeyed the equation as 1-2/3η-(1-η)^{2/3}=7.126×10^{-4}C^{0.3038}R^{0.1942}t.
2
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Self-Ion Assisted Modification of Elastomer and Its Micro- and Macroscopic Properties

80%
Kasperovich A., Luhin V., Tashlykov I., Żukowski P.
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vol. 125
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issue 6
1421-1424
EN
The composition of Zr-based thin films on rubber was investigated by utilizing the Rutherford backscattering technique and RUMP code simulation. The level of adhesion between the coating fabricated on rubber by means of self-ion assisted deposition was measured using Pin Pull Test. The coating deposited on the rubber consists of Zr, O, C, H. The self-ion assisted deposition process may successfully control the level of adhesion of the coating to the rubber and causes strong modification of the macroscopic properties of the rubber surface.
3
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Studying Static, Dynamic and Transport Properties of Mg₃Bi₂

61%
Kayadibi F., Günay S., Taşseven Ç.
Acta Physica Polonica A
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2015
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vol. 128
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issue 3
440-446
EN
In this study, new potential parameters for Mg₃Bi₂ are proposed which is the Born-Mayer-Huggins type potential. Static, dynamic and transport properties are studied for this material from 300 K up to 1600 K with classical molecular dynamics simulation. Mechanical properties; like elastic constants (C_{11}, C_{12}, C_{13}, C_{33}, C_{44}), bulk modulus and shear modulus are found. All these data are compared with the limited number of experimental and first-principle studies. Our results give a good description of the Mg₃Bi₂ system: lattice constants, α → β transition temperature, melting temperature, diffusion coefficient, density and mechanical properties are promising.
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