Materials Literature
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Phase change RAM (PCRAM) is one of the best candidates for the next-generation nonvolatile memory. Recently lateral PCRAM using a thin phase change bridge was proposed as a promising approach to achieve high density due to simpler fabrication process and lower RESET current. This paper proposes a new lateral PCRAM str…
The effect of accumulation of the tert -butyl groups in the phenyl rings of tetraphenylporphine on the complex formation rate of tetra(3,5-di- tert -butylphenyl)porphine ( I ) with copper(II), zinc(II), and cadmium(II) acetates in acetic acid and in a mixed ethanol-benzene solvent was studied by the chemical kinetics…
Purpose The purpose of this paper is to describe two new thick film paste systems (one glass‐based and the other polymer‐based) for insulating aluminium substrates and allowing components like high‐intensity light‐emitting diodes to be attached to a conductor deposited on the dielectric. Design/methodology/approach Co…
This study describes synthesis of FeCo nanoparticles by using a method which couples electrodeposition of metals with the employment of high power ultrasound. A 20 kH titanium alloy horn ultrasound generator, a “sonoelectrode”, generated short current pulses which were triggered and followed by u…
We report an experimental investigation by electron paramagnetic resonance of the doublet of lines split by ∼1.3 mT and centered on the E′γ center resonance line in the spectrum of irradiated amorphous SiO2. Commercial and sol-gel materials, some of which subjected to hydrogen-deuterium exchange, were investigated. Ex…
Zn ( 1 − x ) Mg x O alloys have been grown by using metal-organic vapor phase epitaxy (MOVPE) technique on ZnO substrates at 800°C. The photoluminescence spectroscopy was used to determine the alloy composition. Mg solid compositions up to 20% have been obtained by MOVPE, depending on the relative Mg∕Zn pressure ratio…
Concrete panels are usually used to provide protection against incidental dynamic loadings such as the impact of a steel projectile. In this paper finite element technique is used to investigate the dynamic behavior and failure conditions of reinforced concrete panels subjected to the projectile impacts. Finite elemen…
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Recent advances in glass shell production from the pyrolysis of silicon-doped glow discharge polymers have led to the new ability to manufacture glass shells with germanium dopant in the wall. Comparison of the strength and helium permeability properties of these glass shells relative to their pure silicon dioxide cou…
Partial discharges (PD) diagnostics play an important role in insulation diagnosis of HV power cables all over the world. By application of such diagnostic it is possible to asses the quality of final product (cable) during factory test, during after-laying test or during service life. In this way knowledge about the…
Modern industry has frequently employed ethylene glycol ethers as monomers in plasma polymerization process to produce different types of coatings. In this work we used a stainless steel plasma reactor to grow thin polymeric films from low pressure RF excited plasma of diethylene glycol dimethyl ether. Plasmas were ge…
Structural, vibrational and electron paramagnetic resonance (EPR) analysis for compound ZnCr 2 O 4 are shown in this work. These types of materials are used in technological applications as humidity sensors and piezoelectric devices. The compound was obtained by mean of solid state reaction technique from binary precu…
The structure and stability of local centers involving a different number of oxygen atoms on the surface of crystalline lead sulfide (001) were calculated in the framework of the cluster approach by the hybrid density functional theory B3LYP method. The trends of the formation of such centers and changes in the core e…
The impact of engineered nanoparticles (ENP) on human and environmental health is largely unknown at the moment, although their applications involve a wide range of fields from electronics, medicine, environmental remediation, packaging, etc. and their use are becoming very common. Currently the best way to estimate t…
The electronic structure and exciton states of cylindrical ZnO nanorods with radius from 2 to 6 nm are investigated based on the framework of the effective-mass theory. Using the adiabatic approximation, the exciton binding energies taking account of the dielectric mismatch are solved exactly when the total angular mo…
The structure of a new representative of the eudialyte group with the formula (Na,Sr,K)18Ca6Zr3Fe[Si25O72](OH)2Cl · H2O from the Lovozero massif (Kola Peninsula) was studied by X-ray diffraction. The trigonal unit-cell parameters are a = 14.226 Å, c = 30.339 Å, sp. gr. R $$ \bar 3 $$ m; the R factor is 0.045 based on…
This paper presents the results from integrating a low-power partial discharge detector with a wireless sensor node designed for operating as part of an IEEE 802.15.4 sensor network, and applying an on-line classifier capable of classifying partial discharges in real-time. Such a system is of benefit to monitoring eng…
The amorphous chalcogenide glass Sn1As20S79 is demonstrated to undergo permanent changes in refractive index on irradiation with ultraviolet light. The refractive properties of this material and the effect of annealing at temperatures below the glass transition temperature are investigated in detail. An Sn1As20S79 str…
Optical characteristics of the composites based on an amorphous polymer and a luminescent dye [poly(vinyl chloride)-Rhodamine 6G] prepared via solvent crazing are studied. After annealing at temperatures above glass transition temperature T g, the samples show a dramatic increase in the intensity of absorption and lum…
The a-plane MgxZn1−xO (0≤x≤0.25) films were grown on r-plane (011¯2) sapphire substrates using metal-organic chemical vapor deposition. Growth was done at temperatures from 520 °C, with a typical growth rate of ∼500 nm/h. Film thickness was varied by changes in deposition time, while Mg/Zn metal-organic flow was varie…