Materials Literature
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Abstract Filtration is a simple and effective way to capture particles of different sizes used in different workplaces. However, the state of current knowledge has shown that the performance of entire filter depending on the particle size are still very limited. The main objective has therefore been to develop a proce…
Multi-band operation for terahertz wireless systems is a challenging problem. We propose a tri-band linear to circular polarization converter in the terahertz regime using metasurfaces in transmission modes. The converter is composed of bi-layered metasurfaces separated by a dielectric spacer. Three bands (0.54-0.804,…
— The structural phase states and silumin’s defect substructure of silumin hypoeutectoid composition subjected to electron beam processing with the following parameters: energy density—25 J/cm2, pulse duration—150 µs, number of pulses—3, pulsed repetition rate—0.3 Hz were analyzed by methods of modern physical materia…
Results of research of electromagnetic response of 3D-printing hexagonal ferrite BaFe12O19composite at frequency range 34-250 GHz at room temperature are presented. Region of natural ferromagnetic resonance near 46.5 GHz was found. The possibility of creating a 3D-printing of frequency selective shielding's based on t…
Metamaterials-based terahertz (THz) sensor becomes increasingly important with the growing development of THz functional devices. We experimentally demonstrate a metamaterials-based multiband absorber at f = 0.58, 0.92, and 1.58 THz. Utilizing the perfect absorption of an improved electric split resonant array, we wer…
We present a single-layer H-shaped all-silicon array exhibiting tunable ultra-broadband terahertz wave absorption. Experiment and simulation reveal near unity absorption at ~1 THz, with a bandwidth of ~913 GHz for ≥90% absorbance. The absorption is optically tunable, exhibiting a resonance frequency blueshift by 420 G…
THz wave dynamic phase shifting with a low loss is a hot topic recently. Here, we proposed a metasurface composed of metallic “I” structure in a hole and Vanadium Dioxide patches, which can achieve a photo induced phase shifting in Terahertz range. By combining the concepts of extraordinary optical transmission of sub…
The effect of hydroquinone and pyrocatechin on the corrosion and electrochemical behavior of steel in a model concrete pore liquid has been studied.Corrosion tests have shown that hydroquinone and especially pyrocatechin can be superior in protective properties to sodium nitrite under conditions simulating the corrosi…
Radiation characteristics of wideband Fabry-Perot cavity (FPC) antennas formed by a cavity covered by thick partially reflective surfaces (PRSs) are shown analytically and verified numerically. Thick PRSs are designed and optimized to exhibit a reflection phase with positive slope with a non-Foster-like response in th…
Results of research of absorption properties of created 3D-printing MWCNT composites at the 115-258 GHz frequency range at room temperature are presented. Technology of producing THz absorbing composite is shown. The influence of mass ratio of ABS and MWCNTs 1-4 wt.% on the complex dielectric constant of the 3D-printe…
The article presents a method of measuring permittivity and permeability for a powdered material. The measurements were carried out for the material based on barium hexaferrite with various degrees of substitution Ti(x) = 0; 0.25; 0.5; 1.0. The calculated dependences of permittivity and permeability for the powdered m…
Abstract An expression for the Helmholtz free energy of a nanocrystal that contains vacancies in lattice and the delocalized (diffusional) atoms is obtained on the basis of the previously proposed three-phase model of a simple matter and the RP(vac)-model of a nanocrystal. A model of the Gibbs surface, on which a port…
This paper investigates the modeling and operation of dual H-bridge current flow controllers (CFCs) in meshed high-voltage direct-current (HVDC) systems. Two operating modes of the CFC device, namely the `buck mode' and the `boost mode', are defined and analyzed. Small-signal models of the dual H-bridge CFC are derive…
It is well-known that lower modes of vibration are responsible for a high percentage of the dynamic response. In this paper, the task of simulation of the dynamic response of the composite wind turbine blade on the basis numerical realisation of a developed low dimensional beam type model is considered. From the gover…
Sleeve ferrite core is an EMI suppressor widely used to reduce the conductive and radiated electromagnetic noise in cables. The interconnection of different electronic systems through cables is becoming more difficult due to the hard restrictions related to EMC compliance requirements. Thereby, the research of new sol…
Abstract Superconducting materials with high current carrying capacity operating in magnetic fields up to 18 T at 4.2 K are required for promising applications in magnetic systems of high-energy physics devices, NMR-spectroscopes and others. The paper presents the study results of the Nb3Sn strands manufactured by the…
In developing new composite materials and solving heat transfer problems, the thermal conductivity is an important characteristic that must be reliably determined. This often requires samples of the smallest dimensions, which is relevant for the production of pilot batches of material, as well as if they are taken dir…
High-quality solidification microstructure during directional solidification relies on precise temperature gradient control, so accurate calculation of the temperature field is critical. In this study, a 3D transient global heat transfer model of directional solidification by the Bridgman method based on the finite di…
Abstract The competition between phase formation of BaF2and Ba(Fe1−xCox)2As2on CaF2single crystals has been analysed. Ba(Fe0.92Co0.08)2As2thin films have been deposited by pulsed laser deposition. X-ray diffraction, atomic force microscopy and scanning electron microscopy studies have revealed that the formation of se…
The development of small-diameter artificial vascular grafts has become a research hotspot in recent years. To achieve long-term patency, an ideal vascular graft should have the capacity to recruit host cells to participate in vascular tissue regeneration. Based on previous research, we provide detailed descriptions o…