Materials Literature
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Ce sujet de recherche vise le procédé de soudage par friction malaxage (FSW). L’étude menée se focalise sur la corrélation entre les paramètres du procédé (vitesse d’avance et fréquence de rotation de l’outil) et les caractéristiques mécaniques et microstructurales des tôles d’alliage d’aluminium 5083 H111 de six mill…
We present the combination of black silicon texturing and blackened bus-bar strings as a potential method for obtaining all-black solar panels, while using conventional, front-contacted solar cells. Black silicon was realized by mask-less reactive ion etching resulting in total, average reflectance below 0.5% across a…
The present study deals with the optimization of spinning and plying process of raw and finished conventional ring spun and compact yarns. It was found that compact yarns have better properties before and after applying finishing process as compared to ring spun yarns. There was relative improvement in the properties…
The thermoelectric properties of polycrystalline materials on the base of WS2 with Nb partial replacement of metal atoms W have been researched in this work. The temperature characteristics of the materials have been measured in the temperature range from 77 to 300 K. We have found that replacement of metal atoms W pa…
The paper is devoted to the development of the specialized finite element software for calculating the thermoelastic behavior of flight vehicles nose caps. We present the results of modeling performed along the flight trajectory at Mach number changing during the flight.
Nanocrystalline materials based on solid solution ZrO2-Y2O3were prepared using a co-precipitation in water solutions followed by sintering in different conditions. Crystal structure, morphology of the products and phase equilibria in the system were investigated. It was shown that the degree of aggregation of powder s…
Structure and the nonlinear optical susceptibility are tabulated for 220 acentric crystals of simple and binary borates, using in optoelectronics. It is shown that in the plane of the metal-oxide bond lengths these crystals are positioned inside of the vertical, horizontal and slope intersected ellipses of "acentricit…
Linear nanostructures with different length to diameter ratios were synthesized by reduction of nickel formate with hydrazine hydrate in ethylene glycol medium. The effect of the synthesis conditions such as temperature, reduction time, and nickel formate concentration on the reduction products was studied. Morphology…
This paper will discuss the technological aspects of direct bonding copper (DBC) process conducted on a copper foil (M006) with high thermal conductive alumina (BK-96, BK-100) and aluminum nitride ceramics (AIN) being utilized in bonding. There is a wide use of DBC structure in the construction of high power semicondu…
The present work reported a novel way of direct and quick making nanocrystalline Ti-B/Ti-B-N phases out of amorphous boron powder (B) and crystalline titanium (Ti). Nanopowders were obtained by the synthesis in a hypersonic plasma jet. This method is based on the use of a coaxial magnetoplasma accelerator as a plasma…
The ionization yield of ion tracks in polymers and bio-molecular systems reaches a maximum, known as the Bragg peak, close to the end of the ion trajectories. Along the path of the ions through the materials, many electrons are generated, which produce a cascade of further ionizations and, consequently, a shower of se…
The synthesis of ZnO nanocrystalline by laser ablation of a pure zinc metal target in pure water are presented hear. X-ray diffraction (XRD) analysis show that the ZnO nanoparticle is having crystalline wurtzite phase. Transmission electron microscopy (TEM) image illustrate that the ZnO nanoparticles is spherical shap…
W artykule przedstawiono przegląd rozwiązań przekładni magnetycznych. Zaprezentowano koncepcję indukcyjnego przemiennika momentu, który jest w założeniu przekładnią magnetyczną o zmiennym przełożeniu kinematycznym i dynamicznym, wykorzystującą do przeniesienia napędu zjawisko indukcji napięcia i momentu elektromagnety…
We present an accurate and robust surface potential based compact model for AlxGa1−xN/AlyGa1−yN/GaN double hetero-junction high electron mobility transistors (DH HEMTs). The effects of band on the carrier distribution and polarization charges are studied in our model, which are characterized by the surface potential e…
This paper presents a continuation of an investigation into the behavior of lead magnesium niobate-lead titanate, Pb(Mg0.33Nb0.67)0.65Ti0.35O3) (PMNT) thin film at high frequency through electromagnetic (EM) simulation. The purpose of this paper is to improve the electrical characteristics. The electrical characterist…
We propose the design of a reconfigurable graphene leaky wave antenna based on dielectric grating. By simply adjusting the biased voltage applying to the graphene, the radiation pattern and operation frequency can be tuned.
A novel polarization insensitive metasurface for monostatic Radar Cross Section (RCS) reduction is designed, fabricated, and investigated. The proposed metasurface is comprised of carefully arranged unit cells with spatially varied dimension, which enables approximate uniform diffusion of incoming electromagnetic ener…
The heat balance of gasoline engine is analyzed and the losses of received energy from fuel are simulated. It's based on the using the experimental diagram of engine operating cycle. The power balance of automotive engine for the appropriate modes of the moving vehicle is evaluated. The driving cycleis used in accorda…
The design of the fuel cell plays a major role in determining their cost. It is not only the cost of materials that increases the cost of the fuel cell, but also the manufacturing techniques and the need for skilled technicians for assembling and testing the fuel cell while manufacturing. The main aim of this work is…
This work concerns the modeling by finite element method of magnetostatic's phenomena occurring in ferromagnetic material and governed by the 2D non-linear equation. It deals with magnetic interaction between the magnetic field produced by an independent source field (land) and ferromagnetic material representing the…