Materials Literature
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The cooperative Jahn-Teller effect is considered in the crystal samples of finite size. Peculiarities of the plate sample phonon spectra and their influence on the microscopic theory of the structural phase transitions are in the focus of attention. The mutual orientation of the crystal axes and the plate plane is dis…
In order to solve the problem of imaging drift in scanning electron microscope (SEM) that caused by electron beam drift, electromagnetic interference and other reasons, an image shift correction algorithm based on ORB (oriented FAST and rotated BRIEF) combing the PROSAC (progressive sample consensus) is proposed in th…
Atmospheric plasma such as dielectric barrier discharge (DBD) has can eliminate bacteria and fungus by disrupting cell wall or cell membrane directly. Ozone ( O 3 ) created via process of DBD plasma generation, is very harmful to human if its concentration is higher than 0.25 ppm. The objective of this research is to…
Abstract HHD hot work tool steel with a circular hole and a regular triangular hole were prepared to compare the thermal fatigue behavior. The results showed that the crack resistance of the sample with structure of the circular hole was superior to that of the regular triangular hole due to the release of tensile str…
This research fabrication hydrogen generator and effects of hydrogen gas from Al powder. The hydrogen production the reaction between activated CNTs/Al and water has been investigated. The effect of different parameters such as water, Al ratio, CNTs/Al and pressure ratio. Reactor hydrogen generation consists of NaOH t…
The possibility of forming a limited solid solution Eu 1-x Fe x O in the structure of a spintronic composite material EuO:Fe obtained by the high-temperature solid-phase reduction method of a mixture of higher metal oxides is discussed. Its prevailing role in the formation of outstanding physical properties of this co…
Abstract The paper deals with an anisotropic continuum damage model to describe the brittle damage and fracture behavior of plain concrete. Due to the stress state dependence of damage and fracture, multiaxial experiments have to be analyzed to make sure the model is able to simulate the observed physical phenomena. T…
Abstract The temperature dependences of the optical path difference ∆і(Т) and relative changes δlі/lі in the thickness of Rb2ZnCl4 crystals have been studied. The temperature dependences of the relative changes in the refractive indices δnі/(nі – 1) are calculated. The critical index of the temperature changes in the…
Abstract The effect of MgB 2 addition on the Eu 1 Ba 2 Cu 3 O 7 (EBCO) ceramics was systematically studied. Series of Eu 1 Ba 2 Cu 3 O 7 + x(MgB 2 ) samples (x = 0 wt.%, 0.05 wt.%, 0.1 wt.%, 1 wt.%, 3 wt.%) were prepared using traditional solid state method. X-ray powder diffraction measurements were used for phase id…
Abstract There exist a number of classical analytical solutions for the calculation of the residual stresses produced by autofrettage. Historical solutions for thick‐walled tubes are based on assumptions, which are approximate in comparison with reality and limited in the range of applicability. New results for realis…
Silicon nitride/cobalt tungsten boride (SiN/CoWB) passivation layer improves mass transport rate at copper thin film layers of semiconductor wafers after chemical mechanical polishing process. This study evaluates mass transport at the interface between copper and passivation layers by stress relaxation method, follow…
Support frameworks of transport vehicles operate under varying terrain conditions under the influence of extreme climate and corrosive environments. When transporting cargo, dust is deposited on the surface of metal structures. The combination of dust and moisture creates an aggressive environment resulting in intense…
Abstract Besides large nonlinear deformations, polyurethane adhesives exhibit elastic and viscous material behaviour simultaneously. Although the concept of rheological elements is a quite simple method to describe rate effects, the identification of model parameters is a challenging task. Dynamic mechanical analysis…
Abstract The crystal structures of Bi1 – xPrxFeO3 solid solutions in the vicinity of the transition from the polar rhombohedral phase to the nonpolar orthorhombic phase have been analyzed by X-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. These methods made it possible to re…
Abstract The utilization of additive manufacturing enables the realization of rather complex part geometries. In the context of powder bed‐based selective beam melting processes, parts are built in a layer‐by‐layer fashion by locally fusing powdered material using either a laser or electron beam. The simulation of pow…
Topological crystalline insulators (TCIs) are insulating electronic phases of matter with nontrivial topology originating from crystalline symmetries. Recent theoretical advances have proposed new TCI states protected by rotational symmetries and provided powerful guidelines to search for TCIs in real materials. Build…
Abstract The paper deals with an experimental and corresponding numerical series of the biaxial Z‐specimen, which is made of an aluminum alloy, to investigate the effect of negative stress triaxialities on ductile damage and failure, which are stress‐state‐dependent. Therefore, the continuum model contains a stress‐st…
In this work, a set of couple-mode equations for describing a backward third harmonic generation (BTHG) in a one-dimensional periodic structure of positive-index material (PIM) layers and third-order nonlinear negative-index material (NIM) layers was analysed using multiple-scale method. Due to the negative-index phas…
Abstract The effect of the Al–Ga melt composition on the mass transfer processes occurring during silicon recrystallization has been investigated by the thermomigration method. The threshold temperatures of thermomigration onset are determined. The kinetic regularities of liquid zone thermomigration, related to the re…
Abstract Semicrystalline thermoplastic polymers have superior mechanical properties and are thus very important in numerous technically relevant applications. During the thermoforming process of parts made of thermoplastic polymers the “springback effect”, i.e. the undesired distortion of a part after unloading and re…