Materials Literature
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The characteristics of gallium selenide with a ferroelectric liquid crystal in between its layers are studied. The liquid crystal consists of an achiral smectic (a derivative of phenyl benzoate) and a chiral component. The frequency behavior of the specific impedance, permittivity, and loss tangent at different temper…
A series of poly(A-block-B-block-A) copolymers based on biodegradable poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and amorphous polystyrene (PS) were synthesised by atom transfer radical polymerisation (ATRP). The chemical structure, molecular weight and distribution were systematically characterised by Fourie…
The structural, electronic, and optical properties of rutile—, CaCl 2− , and PdF 2 —ZnF 2 are calculated by the plane-wave pseudopotential method within the density functional theory. The calculated equilibrium lattice constants are in reasonable agreement with the available experimental and other calculated results.…
The species composition of centric diatoms from Lake Frolikha (Transbaikal area) has been studied. The lake is located on the eastern shore of Lake Baikal and connected with it by a river. Twenty-three species of Centrophyceae from 7 genera ( Aulacoseira, Cyclostephanos, Cyclotella, Discostella, Handmania, Pliocaenicu…
Continuous SiC fibres have been widely studied and employed as important reinforcement of ceramic matrix composites. The heat resistant property of SiC fibres can be improved by introducing boron into the polycarbosilane (PCS) precursor. The boron containing PCS (B-PCS) was produced by reaction of low molecular PCS (L…
The traditional Fowler-Nordheim (FN) equation has been repeatedly shown to fail for highly curved surfaces. In the past there have been modifications to it mostly for spherical surfaces. In this paper we derive a generalized FN-type equation which is valid for all potentials and surfaces. Both the current density at t…
Abstract Metal codoped nickel ferrites were successfully prepared from laterite leaching solutions. X-ray diffraction (XRD) results indicate that all the samples are well-crystallized NiFe2O4 with face-centered cubic structure, which can be further confirmed by Fourier transform infrared spectrometry (FTIR). Scanning…
Thermodynamic incompatibility between the hard and soft segments in thermoplastic polyurethanes (TPUs) leads to a two-phase microstructure, which is usually demonstrated by the characterizations of fourier transform infrared (FTIR) spectroscopy and differential scanning calorimetry (DSC). The effect of thermal-oxidati…
This paper focuses on the description of the behavior of supercapacitors during over-temperature and over-voltage stresses and the consequent ageing processes. Specific physical evidences supporting the explanation of the experimental findings are provided and discussed in the paper. A method to distinguish between ov…
In this paper, we have proposed a method to design a terahertz metasurface which can significantly reduce the backward radar cross section(RCS) within an ultra wide frequency band. Four basic elements have been chosen, with the phase difference between adjacent elements 90 degrees. The far field contributions from the…
Graphene is a monolayer of carbon atoms which exhibits remarkable electronic and mechanical properties amenable to photonic and sensor applications. While the plasmonic nature of graphene at terahertz frequency has been widely reported, investigations on the practical utility of graphene in antennas have been very spa…
AZ31B magnesium alloy ring with a large diameter and a thick wall was fabricated using a centrifugal casting technique. We focus on the incipient motion of the primary α-Mg phase and the microstructures of the ring. The microstructures and tensile properties of the ring were studied and it was compared with convention…
Glass-ceramics are nanocomposite materials which offer specific characteristics of capital importance in photonics. This kind of two-phase materials is constituted by nanocrystals embedded in a glass matrix and the respective composition and volume fractions of crystalline and amorphous phase determine the properties…
Heterometallic compounds of general formula [Fe 2 III MIIO(O2CR)6(H2O)3] · 3H2O (R = CH3, M = Co, Ni; R = CCl3, M = Co, Ni) have been studied by XPS. The compounds have been identified as high-spin complexes with metal atoms in oxidation states M(II) and M(III). Analysis of the XPS data revealed the tendency of the XP…
Using optical microscopy, scanning electron microscopy, X-ray energy spectrum analysis and thermodynamic calculation software Thermo-Calc, inclusions, grain size and precipitates from different positions in the forging ingots of two different smelting process are compared and analysed, along with the formation mechani…
Разработано покрытие ЭВК-104М, обеспечивающее защиту высокопрочного сложнолегированного никелевого сплава ВЖ159, предназначенного для деталей и узлов ГТД, работающих в особо теплонапряженных условиях, от высокотемпературной газовой коррозии при температуре 1050°С длительно и при температуре 1200°С кратковременно.
Обоснована применимость модели сорбции и диффузии влаги, учитывающей диффузию по закону Фика, процессы структурной релаксации, химической реакции и влияние дефектной кромки, для диагностики состояния углепластика на начальной стадии старения. Показано, что после 6 мес старения в условиях умеренно теплого климата обнар…
The possibility of oriented growth of thin copper films with a (200) texture on a SiO 2 /Si substrate by magnetron sputtering in medium vacuum is demonstrated for the case when a predeposited nickel layer with a (200) texture serves as an orienting sublayer.
In this study, in order to explore a suitable method to obtain a better wear resistance and corrosion resistance of austenitic stainless steel, low temperature plasma carburizing technology has been studied. Research on the properties of austenitic stainless steel under different carburizing atmosphere proportion, wit…
The amphiphilic graft copolymer using chitosan and hydroxypropyl chitosan (HPCS) as hydrophilic backbone and poly(l-lactide) (PLLA) as the hydrophobic segment was prepared by a two-step method. Hydroxypropyl chitosan was prepared first by the reaction of chitosan and propylene oxide in isopropanol, then the HPCS graft…