Materials Literature
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Abstract Nematic liquid crystal elastomers represent a group of materials, which combine elastic properties of rubber with orientational properties of liquid crystals. The present contribution proposes a variational homogenization principle for nematic liquid crystal elastomers. A symmetric and traceless tensorial qua…
Quasiclassical equations of the one-gap superconductivity theory have been applied to superconductors with two energy gaps. Using the equations for Green’s functions obtained in the t-representation, the Josephson current density through tunnel junctions with two-gap superconductors is calculated.
Abstract The research on magneto‐electric materials is concentrated on multi‐ferroics and hard‐matter composites. However, rather recently soft composites also exhibiting pronounced magneto‐electric coupling entered the scene. Such composites are straight‐forward to manufacture and have cheap constituents compared to…
The polycrystalline sample of Ba 2 Co 1.5 Mg 0.5 Fe 11.88 Ga 0.12 O 22 Y-type hexaferrite, doped with Ga-cation, was prepared by using the solid-state reaction method. The crystalline structure of sample was investigated by x-ray diffractometer (XRD), and the magnetic properties of sample were measured by vibrating sa…
Abstract K1 – хCsхNO3 (х = 0.015, 0.035) single crystals have been synthesized from aqueous solutions. Polymorphic transformations in them at temperatures from room to melting have been investigated by X-ray diffraction. The existence of two polymorphic crystal modifications in this temperature range is established. T…
One of the causes of corrosion and destruction of refractory lining in pyrometallurgical processes is the occurrence of melts in the most intensively altered zones of refractory material. This phenomenon has a direct analogy with the process of interaction of magma with crystalline rocks of various composition and the…
Abstract Metal foams are cellular materials with structural features resembling to lightweight load‐bearing materials such as bones. Their high stiffness‐to‐weight‐ratio coupled with their long flat stress‐strain response make them ideal candidates as energy absorbers. Their macroscopic properties are strongly influen…
Abstract A phase field model is used to evolve structures with almost homogeneous equivalent stress σv. The model combines the sensitivity of a stress‐based and a couple‐stress‐based objective function. Since couple‐stress typically increases at stress‐singularities, it is an efficient parameter to influence the topol…
The main impetus of the present study is to investigate thin films of tin disulfide that have been doped with copper impurities and prepared on glass substrates by using the spray pyrolysis technique. Also, the influence of the substrate temperature on the structural, optical, and electrical properties of these films…
In present work the one-step direct relief formation of diffraction gratings using As 2 S 3 –Se nanomultilayers were studied. We have carried out a study of the polarization sensitive recording properties of the chalcogenide glasses in form of nanomultilayers. Nanomultilayers deposition, samples structure and recordin…
A mathematical model of the synthesis of butadiene rubber in a continuous reactor under the action of a neodymium-containing catalytic system has been described. The mathematical model allows to study the process, to study the dynamics of the concentrations of reacting substances and to predict the properties of the p…
A generation of cross-polarized wave (XPW) in nonlinear hyperbolic metamaterials (NHMM), which are composed of periodic arrangement of gold (Au) and barium difluoride (BaF 2 ) layers with subwavelength thickness for exhibiting anisotropy of permittivity and third-order nonlinearity, has been investigated numerically.…
Abstract Shape memory alloys show the effect of functional fatigue under cyclically loading. This fatigue comes along with a decrease of the stress plateaus in the characteristic hysteresis curve which is also accompanied by an accumulated permanent strain. Cyclic experiments detected that a formation of dislocations…
Abstract In this work, a novel, displacement‐driven approach to crystal plasticity based on embedded strong discontinuities (ESDA) is presented, cf. [1, 2]. In contrast to the classical strain‐driven approach, which connects the Schmid stress to the slip strain at a certain slip system, the novel approach applies a tr…
The thermal properties such the coefficient thermal expansion, α (CTE) of fused borosilicate syntactic foam was determined using dimensional changes of a temperature gradient plot. The CTE was measured and found to be achieved the value lower than the vinyl ester resin matrix when mixing with different weight percenta…
In this work, the van der Waal heterostructures (vdWHs) based on blue phosphorus (blue-P) and ZnO were investigated in terms of structural stability and optical properties. Two vdWHs, that are (4,6)-tetragoanl-ZnO/blue-P (46tet-ZnO/blue-P) and hexagonal-ZnO/blue-P (hex-ZnO/blue-P), were investigated using the density…
This study attempts to improve the adhesion and conductivity of polyaniline (PAni) by incorporating an alkyd and titanium dioxide (TiO2), respectively. PAni with different TiO2 content (10, 20, and 40%) are synthesized through chemical oxidation method by using aniline (Ani) monomer, dioctyl sodium sulfosuccinate (AOT…
Molecular dynamic and mesoscopic simulations are used to predict the morphologies of PS-b-PI diblock copolymer. Flory-Huggins interaction parameter is an intermediate parameter used to connect between both simulations. The repulsions between different beads are one of essential parameters that were calculated from the…
Abstract Open‐cell structures like open‐pore foams have several applications, e.g. as acoustic damping material in civil engineering. Most models for such materials capture the static but not the dynamic behavior correctly. In order to develop a model which is able to describe the static and the dynamic properties, an…
A new form of the linear augmented cylindrical wave method is proposed. For the construction of basis functions, the electron potential is taken to be spherically symmetric in atomic regions, constant in the intermediate region and cylindrically symmetric in the vacuum regions. The basis functions of the method, obtai…