Materials Literature
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Low-voltage, aberration-corrected, High-Resolution Transmission Electron Microscopy (HRTEM) has proven to be an excellent tool for structure analysis of graphene films, which are typically one or a few atoms thick. Experimental observations of graphene films by HRTEM exhibit several challenges due to low contrast and…
Our ability to control and harness light is undergoing a revolution, one that exploits the special properties of metals and our ability to structure them on a subwavelength scale. The materials that enable such control involve plasmonic and metallic metamaterials, materials that provide challenges
The synthesis of various soft and hard magnetic ferrites and their use in microelectromechanical systems (MEMS) are presented in this paper. We investigate the feasibility of screen-printing process of ferrite magnetic nanoparticles produced by carbon combustion synthesis of oxides (CCSO). These ferrites can be used a…
Procedures for preparing nanomodified powder epoxy compounds with various concentrations of montmorillonite were examined. The dispersion of particles in the epoxy oligomers was studied by X-ray diffraction analysis and electron microscopy. The influence of the content of the modifiers on the physicomechanical propert…
Abstract Melting of chemically bonded solids has been explained recently by transitions of electrons in higher electron states. Such transitions are shown to cause decomposition of the crystals into many units or sub‐systems build‐up of one or few atoms that mix in the melt. Most chemical elements possess molar meltin…
A mathematical model of a solid oxide fuel cell is presented for investigation of the thermodynamic cycles of power plants. The model is one-dimensional in two directions: in the direction of fuel flow in the supply channel and perpendicular to the contact planes of the electrolyte and electrodes. Electrochemical reac…
This paper investigated the microstructural characterization and mechanical properties of Mg-Zr-Ca alloys prepared by hot-extrusion for potential use in biomedical applications. Mg-Zr-Ca alloys were fabricated by commercial pure Mg (99.9%), Ca (99.9%), and master Mg-33% Zr alloy (mass%). The microstructural characteri…
peer reviewed
A symmetric binary mixture of terminally charged trifunctional-core/difunctional-branched dendrimers of the third and the fourth generation is examined in explicit solvent solution by means of molecular dynamics simulations. The static and dynamic response of the components is monitored under a varying strength of ele…
A heterostructure composed of a Bi 2 Fe 4 O 9 film and an n-type Si substrate is fabricated. The characteristics of leakage current density versus electric field are investigated and the leakage current density is about 6 × 10 −6 A/cm 2 at an electric field of 200 kV/cm at 300 K. A strong photovoltaic effect is observ…
An optical temperature sensor based on infrared-to-visible upconversion emission in Er 3+ /Yb 3+ co-doped Bi 3 TiNbO 9 (BTN) ceramics is reported. The fluorescence intensity ratio of the green upconversion photoluminescence (UC-PL) around 524 nm and 545 nm depends on temperature. The operating temperature range and th…
The electromagnetic parameters of synthesized M-type hexagonal ferrite composites, Ba0.5Sr0.5CoxZrxFe(12-2x)O19(x=0.0, 0.2, 0.4, 0.6, 0.8, 1.0), are measured from 0.1-18 GHz. The ferrite composites exhibit dielectric behavior contrary to conventional magnetic nature of ferrite composites. The electron hopping between…
The polymerization of butadiene in the presence of the neodymium versatate-diisobutylaluminum hydride-hexachloro- p -xylene catalytic system is studied. Quantitative information on the kinetic parameters of the process is obtained. The effects of the monomer concentration, the catalyst, and temperature on the molecula…
Objective: The study aimed to clarify the compositions of 14 brands of superelastic NiTi orthodontic wires. Materials and Methods: The compositions were analysed through scanning electron microscopy and energy-dispersive X-ray microanalysis. The wires were tested in differential scanning calorimetry to find the transi…
Polypyrrole modified henequen conductive fibers were prepared by insitu chemical polymerization of pyrrole in presence of henequen fiber using FeCl3 as oxidant. The fibers were initially treated with alkali solution, then modified with polypyrrole and were investigated for their electrical properties, mechanical prope…
Corrosion is one of the major destruction processes involved in material loss, and its prevention is paramount in protecting investments. The present work shows a new contribution to the design of a new protective system based on poly(orthophenylenediamine) (PoPD)–nano- TiO 2 composites. The structure and properties o…
The process of preparing magnesium hydroxide flame retardants with particular morphologies after hydrothermal treatment in the presence of organic modifier ethanediamine was mainly investigated. Influences of such factors as slurry concentration, modifier solution concentration and reaction temperature were studied. M…
This paper addresses the power transformer design optimization problem and, proposes a regression analysis based heuristic optimization method. The main contributions of this research are: 1) introduction of a new effective optimization method which minimizes either the cost of transformer manufacturing or other objec…
An ultrathin, high energy density zinc–air cell has been developed for potential application in microsystems. The key design feature is the utilisation of an inorganic MCM-41 membrane material with three-in-one functional elements. It serves as an insulating layer between the electrodes, as ionic exchange channels and…
This paper presents a finite element (FE) model of a dual-disk rotor system with single rub-impact fault and analyzes the effects of different rotating speeds on its dynamic characteristics. The numerical simulations based on the FE model are conducted to study the rotor transverse vibrations of the rotor system. The…