Materials Literature
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The backward Raman scattering is studied in dense quantum plasmas. The coefficients in the backward Raman scattering is found to be underestimated (overestimated) in the classical theory if the excited Langmuir wave has low-wave vector (high-wave vector). The second-order quantum perturbation theory shows that the sec…
In this study, the corrosion parameters of stainless steel containing 12% Cr, have been determined by Tafel extrapolation method in 1 M HCl, H 2 SO 4 and H 3 PO 4 media. Later, steel was coated with polypyrrole in 0.1 M Pyrrole + 0.3 M Oxalic acid solution by cyclic voltametric method. The corrosion parameters and per…
Novel heat insulation materials were synthesized by molten salt method by using natural forsterite and NaSO4 molten salt. The insulation materials which have light weight and small size pore were obtained by using different particle size (44 μm, 74 μm and 250 μm) natural forsterite and NaSO4 molten salt at 1000 °C-115…
The impact of implanted hydrogen atoms on mechanical properties and characteristics of plastic-flow localization upon tensile stresses of the polycrystalline Fe-0.07 wt % C alloy is studied. Using the method of double-exposure speckle photography, we identified the main types and parameters of plastic-flow localizatio…
In this paper, by means of Scanning Electronic Microscope (SEM), X-ray diffraction analyzer (XRD) and Cross hatch scanning analysis, the Structure and mechanism of cracking and spalling for Super304H steel oxide films in high temperature steam were investigated. With the oxidation proceeding, the surface of Super304H…
Vacancy behavior and positron trapping at selected grain boundaries in iron, nickel, and zirconia are investigated theoretically. It is found that the grain boundary vacancy loses its free volume in metals at moderate temperatures whereas it is kept up to very high temperatures in zirconia. The consequences of these n…
In this paper, the process of the transformation from kaolin to metakaolin was investigated. The kaolin was calcined at different temperatures and analyzed by Xray diffraction (XRD), Fourier transform infrared spectra (FTIR) and solid state nuclear magnetic resonance (NMR). The formation of metakaolin structure was ba…
We describe the switching mechanism of GeTe/Sb2Te3phase change memory called “topological-switching Random Access Memory” (TRAM). DC sweep and AC transient analysis of the TRAM TEGs provided evidence of enhancement of atomic movement in TRAM by charge injection. A hysteresis loop of resistance that was characteristic…
Based on the optimal primary and secondary pole number combination selection principle of linear switched-flux PM machine (LSFPMM) with odd poles primary, a novel 9/10 primary/secondary poles LSFPMM has been developed. In order to increase the thrust force density, some major design parameters, such as secondary pole…
Electromigration (EM) is the phenomenon of atomic diffusion in a metallic film with a high-density electron flow. Our group used EM to fabricate Al micro-materials. The EM technique can be used to fabricate micro-materials with a high aspect ratio, pure metal components, an arbitrary form, and a single-crystal structu…
Polypyrrole (PPy), a NIR-absorbing conjugate polymer, is used by Z. Liu and co-workers to coat iron oxide nanoparticles (IONPs), obtaining IONP@PPy core–shell nanoparticles, further modified by polyethylene glycol. On page 1194, the obtained multifunctional nanoparticles are guided by dual-modal magnetic resonance and…
The issues on the estimation of the surface damage of the products produced from high-strength alloys are considered. Mathematical relationships for a numerical calculation of the surface damage are given. The peculiarities of the evaluation of the surface damage are investigated, as applied to high-strength alloys.
AIM: This study aimed to assess the quality of water and sediment of urban streams (Lajeado, Preto, Pedras and Lewis-Pedroso) located in Santa Cruz do Sul County, RS, Brazil, using the microcrustacean Ceriodaphnia dubia as test-organism. METHODS: Quarterly scientific excursions to the streams were held on August and N…
Conformational changes of perhydro-1,3,2-dioxazine in open single-walled carbon nanotubes have been studied by hybrid DFT PBE/3z method. It was established that relative stability of equatorial and axial chair conformers of encapsulated molecule has been inverted, the latter form becoming favorable. In this case the b…
The thermodynamic relations describing the formation work of a crack with a meniscus inside it have been analyzed for capillary condensation and evaporation processes. The conformal and depth mechanisms of crack growth have been discussed. It has been shown that the capillary forces alone cannot cause the fracture of…
Two dimensional nanophosphors of high quality play an important role in the miniaturization and intelligentization of opto-electronic components. In this present work, ultra-large (30μm) single crystals of (Y0.95Eu0.05)2(OH)5NO3·nH2O layered rare earth hydroxide (LRH) with a hexagonal shape have been synthisized via a…
The traditional method preparing Si3N4/Si2N2O composite ceramic is to sinter α-Si3N4 powder with additives at relatively high temperatures. But the intergranular phase transformed from the sintering additives can degrade the high-temperature mechanical behavior. Amorphous nanoSi3N4 is used to fabricate Si3N4/Si2N2O co…
This paper investigates the morphological modifications of the nanocrystalline diamond (NCD) film surface under reciprocating sliding test conditions. The surface morphology was characterized by atomic force microscopy (AFM). We observed longitudinal grooves and transverse ripples which were formed during the sliding…
This work presents the application of first-order adjoint sensitivity analysis, uncertainty quantification, and data assimilation to a subcritical plutonium benchmark experiment using a modified version of the discrete ordinates radiation transport code Denovo. Previous Monte Carlo simulations of this benchmark saw a…
Quantitative and qualitative variations in the structure, phase composition, and defect substructure of low-carbon St8ps ferrite steel under conditions of hydrogen saturation and deformation are revealed by means of transmission electron microscopy.