Materials Literature
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We developed an optical model for simulation and optimization of luminescent down-shifting (LDS) layers for photovoltaics. These layers consist of micron-sized phosphor particles embedded in a polymer binder. The model is based on ray tracing and employs an effective approach to scattering and photoluminescence modell…
We introduce an accurate and robust technique for accessing the causality of network transfer functions given in the form of band-limited discrete frequency responses. These transfer functions are commonly used to represent the electrical response of high-speed digital interconnects used on chip and in electronic pack…
Low life service of steel dies used in copper extrusion brought us to inspect several discarded copper hot extrusion dies in order to identify failures and failure mechanisms. The investigations performed are mainly hardness tests and microscopic investigations. The profiles extruded are circular, rectangular and hexa…
The energy efficiency in human activities is low, most of the energy is wasted in the form of waste heat. Waste heat harvesting and thermal management are crucial issues to the economy and the environmental protection. Using artificial microstructure materials in thermal energy transfer and heat flux manipulation is a…
The goal of this paper is to analyze the influence of the mechanical vibrations during the casting on AlSi10Mg casting alloy structure. Seven samples were studied, solidified on vibrating field, using different frequencies and accelerations. After preparation, the structure was studied using optical microscope and SEM…
The R fluorescence lines of rubies that contain 0.022, 0.068, 0.211, 0.279, 0.556, 1.221, and 1.676 wt% of Cr 2 O 3 were measured at temperatures of 100-600 K and at atmospheric pressure. The R 1 line wavenumbers of all of the ruby samples shifted linearly as the temperature increased from 298 to 600 K at atmospheric…
Fiber reinforced plastics, due to their good mechanical properties and simultaneously low density, are very attractive for many uses. They are also gaining more importance in the civil engineering applications. Bio composites based on sustainable raw materials are becoming much more attractive, especially in construct…
The normalized electrical resistance R/R 0 of tin for different pressures of shock compression p is measured. The resultant dependence R/R 0(p) differs significantly from the known dependences for static and quasi-isentropic compression and demonstrates the growth of the electrical resistance with increasing pressure.…
Electroless nickel coatings are widely popular in various industrial sectors due to their excellent tribological properties. The present study considers optimization of coating parameters along with annealing temperature to improve microhardness and corrosion resistance of Ni-P-TiO2 composite coatings. Grey relational…
Sub-wavelength antireflective structures are fabricated by using a soft roll-to-plate nanoimprinting lithography. The proposed methodology employs a modified polyurethane acrylate as a flexible mold due to its high resolution, chemical inertness, polymerization characteristics, and its non-wetting, very low surface en…
Flame-retardant ethylene-propylene-diene copolymer, which is the polymer insulating material most abundantly used for safety-related electric cables in nuclear power plants, was irradiated with gamma-rays to certain designated doses from 500 to 1500 kGy at room temperature or 100 °C in air, and absorption spectra were…
Nanocomposite films based on (Nb2Al)N intermetallic nitride have been obtained by the method of magnetron sputtering. X-ray diffraction analysis revealed two stable states of the crystalline structure: (i) NbN with low amount (within 5 at %) of dissolved Al in a composition close to (Nb 2 Al)N and (ii) an amorphous co…
Recently, a novel class of circular polarization selective surface (CPSS) has been proposed, composed of two planar metallodielectric arrays of split ring resonators (SRR). The coupling between the two arrays is a key factor that defines the performance of the CPSS. Here we present a study of the coupling between two…
We have studied bipolar resistive switching (BRS) with memory in a binary oxide structure Si-SiO 2 -V 2 O 5 -Au manufactured by reactive magnetron sputtering. A physical model is proposed that explains the formation of a BRS structure with a nanosized silicon channel in SiO 2 and reversible modulation of conductivity…
The process of precipitate formation during vapor outflow from a high-temperature geothermal reservoir saturated with a salt solution is investigated numerically. The evaporation regimes characterized by the formation of a phase transition front are considered. Comparison with the asymptotic solution obtained previous…
In this work, a Pd/C catalyst with high activity as well as excellent stability has been prepared by hydrogen gas reduction of Pd(II) precursor in ethylene glycol solution with the assistance of appropriate amount of sodium citrate . Pd nanoparticles with an average particle size of 3.8 nm and excellent uniformity are…
The aim of the current research was to study regularities of chemical bath deposition (CBD) of tin sulphide thin films as function of tin and sulphur concentrations in the solutions. SnS thin films were deposited onto Mo-, ITO-and TO-coated glass and onto borosilicate glass substrates at room temperature for 24 hours.…
Dipole-exchange spin waves in nanotubes composed of uniaxial ferromagnets are studied. An equation for the magnetic potential of linear spin waves in uniaxial “easy plane” ferromagnets is obtained in the magnetostatic approximation taking into account magnetic dipole-dipole interactions, exchange interactions, and ani…
The authors describe performance enhancement in InAs/GaAs quantum dot solar cells (QDSCs) using hydrogen plasma treatment. Photoluminescence (PL) and time-resolved PL revealed clearly decreased defect levels in QDSCs and improved crystal quality after hydrogen passivation. As a result, the open-circuit voltage and eff…
In this paper, low power line start permanent magnet synchronous motor (LSPMSM) is analyzed and simulationed by finite element method using ANSYS RMXPRT and Maxwell 2D/3D modeling software. Parameters of three motor are changed, are modeled than put to the simulation. While the motors are analyzed, motor dimensions ar…