Materials Literature
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The nature of free radicals produced in gamma-irradiated poly(ethylene terephthalate) (PET) has been studied by the electron spin resonance (ESR) and Fourier transform infrared (FTIR) techniques. ESR and FTIR spectra of irradiated PET are recorded at different temperatures and radiation doses, to observe the behaviour…
We have investigated atomic arrangements and electronic properties of two-dimensional Si compounds having the Si(111) skeletons with H and/or OH-radicals terminators, using first-principles calculations within the density functional theory. A mechanism of the onset of a direct gap for the planar siloxene has been clar…
In conventional gas turbine systems combustion results in high exergy losses (∼30%) of fuel exergy input. Replacing the combustor with a high temperature fuel cell, like the Solid Oxide Fuel Cell (SOFC), will significantly reduce these exergy losses. As the SOFC electrochemically converts the natural gas, exergy losse…
The effect of oxygen and carbon oxide on the SnO 2 surface conductivity is considered in the framework of the early model of gas adsorption on semiconductor oxides. A change in the work function of the adsorption system is calculated.
Hydriding combustion synthesis (HCS), which utilizes self-propagating exothermic reaction between metallic powders at pressurized hydrogen, was originally developed for metal hydride production. It offers many advantages to save processing time, to reduce productive cost, and to synthesize high purity product. In this…
Poly(phenylene sulfide) (PPS) films were modified by Ar, O2, N2 and NH3 plasmas in order to improve their adhesion to copper metal. All four plasmas modified the PPS film surfaces, but the NH3 plasma modification was the most effective in improving adhesion. The NH3 plasma modification brought about large changes in t…
The absorption spectra, fluorescence spectra and the lifetimes of 4I13/2 level of Er3+-doped phosphate and tellurite glasses ha ve been measured for sample with different concentrations and thickness. The abs orption cross-section (σa), emission cross-section(σe), spontaneous emission probability(Arad), radiative life…
Normal impact of high‐speed armor piercing bullet on titanium‐steel composite has been investigated using smooth particle hydrodynamics (SPH) code. The objective is to understand the effects of impact during the ballistic testing of explosively welded armor plates. These plates have significant microstructural differe…
This paper presents results of the dynamic mechanical response of for two structural woods, i.e. birch and sequoia. Monotonic and cyclic compression testing at room temperature of these materials was performed using a modified Kolsky method; a 20‐mm diameter split‐Hopkinson pressure bar (SHPB). The birch and sequoia s…
Catalytic wet-air oxidation (CWAO) of wastewater (chemical oxygen demand [COD] = 1800 mg O2/dm3) from a fine chemicals plant was investigated in a fixed-bed reactor at T = 393-473 K under total pressure of 5.0 or 8.0 MPa. Catalysts containing 0.3% wt. of platinum deposited on two supports, mixed silica-titania (SM1) a…
The non-equilibrium molecular dynamics simulation (NEMD) has been performed based on the embeded atom potential to obtain the pair correlation function and the viscosity of liquid Al.The pair correlation function by the simulation agrees well with Waseda's X\|ray diffraction measurement.The temperature dependence of v…
Silk organza can make the silhouette of clothes bulky and rich, owing to its stiffness. And silk organza in the gum has better dyeability so can be dyed more bright and deeper color than scoured silk because silk organza has sericin gum that has better dyeability than fibroin. So, silk organza came into the most broad…
The effects of the external magnetic field on the energy gap of carbon nanotubes were investigated by using the tight-bonding method. It was found that, under the applied magnetic field, the peak of energy gap induced by magnetic field and the slope of energy gap versus magnetic field depend on their diameters tightly…
An effective potential of electron-electron interaction and a two-particle "density-density" correlator are calculated for semi-infinite jellium. Their asymptotics at large distances between electrons are studied in a plane parallel to the surface.
U2Ni2Sn belongs to a large group of U2T2X compounds which are very sensitive to hydrogen absorption. U2Ni2SnH1.8 and U2Ni2SnD1.8 exhibit similar magnetic behaviour - they order antiferromagnetically at T = 87 K, which is much higher than TN = 26 K in U2Ni2Sn. Deuterium lattice sites were determined by neutron diffract…
The reliability of insulation systems is a major requirement of any power apparatus. The incidence of minor flaws and irregularities such as voids, surface imperfections etc, in insulation systems is however inevitable and leads to partial discharges (PD). Classification of PD patterns plays an important role during m…
Monte Carlo simulations in NPzzT and #956;VT ensembles of the hydration of Wyoming-type Camontmorillonite have shown the interlayer confi gurations. Ca-montmorillonite may hydrate to one-, two- and three-layer hydrates of d001 spacing 11.83, 13.73, and 15.60 Å at 353 K and 625 bar. At lower temperatures and pressures…
Aseries of water dispersible polyurethanes containing carboxylate anion as the hydrophilic pendant group were prepared from toluene diisocyanate (TDI), 1,4butanediol (1,4-BDO), dimethylol propionic acid (DMPA) and different molecular weight of polytetramethylene glycol (PTMG). IR Spectroscopy was used to check the end…
Carbon films are deposited by pulsed laser deposition technique in nitrogen (N) environment. Camphor, a natural source is used as a starting precursor for the carbonaceous film. The optoelectronic properties indicate successful doping for the film deposited at low nitrogen content. Photovoltaic characteristics of N in…
Thermoelectric (TE) properties of natural superlattice Ruddlesden-Popper (RP) phases were measured to elucidate their potential as TE materials, and the origin of the TE properties was discussed from the viewpoint of the shape of the TiO6octahedron. Compared with the cubic perovskite-type phase Nb-doped SrTiO3, effici…