Materials Literature
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In a design of optical multilayer films at oblique incidence, reflectance and transmittance curves for two planes of polarizations (S and P polarizations) are different, so a large number of layers are required more than at normal one. Therefore the design process will be more complex. We have already developed the op…
It is said that in hot-rolling titanium surface defects are apt to occur by seizures between rolls and products. Authors have examined the effects of temperatures and lubricants on the tribological behavior of titanium strip surfaces contact with rolls using a hot rolling and sliding wear tester with commercially pure…
The results of the synthesis and the investigaiton of a number of multipodal and branched siloxane and silsesquixane liquid crystals is reported.
Ferroelectric twin domain structures of epitaxial PbTiO3 thin films grown on various single crystal substrates were investigated in-detail by reciprocal space mapping techniques using synchrotron X-ray. Direct comparison with one-directional X-ray diffraction scan that is conventionally employed for structural charact…
Spherical particles of hydroxyapatite with β-tricalcium phosphate were prepared from spherical calcite particles by hydrothermal method. The spherical calcite particles of about 2.5mm in size as the starting materials were formed through the process which transformed hard water to soft water. The spherical calcite par…
The dyeing behaviors and changes in fiber structure in supercritical CO2 fluid for several types of high-speed spun and regular fully oriented poly (ethylene terephthalate) (PET) fibers were compared. At lower temperature and pressure, the high-speed spun fibers, which had inherently larger crystallite sizes and lower…
Nowadays, research is focused on using bio-degradable natural fibre-based composites for secondary structural members. The present study aims to investigate the effect of fiber loading and surface treatment on the mechanical, vibrational, and viscoelastic properties of short, randomly oriented Abelmoschus Esculentus f…
The Markov process is applied to the chain-of-bundles model with fibers packed in a hexagonal array, in order to obtain the analytical solution for the fracture probability of a unidirectional fiber composite. It was assumed in the process that a group consisting of fiber breakage points, the so-called cluster, evolve…
In order to understand in detail the secondary recrystallization behavior of fine-grained molybdenum alloy sheets dispersed with TiC and HfC particles of 0.8mol%, the effects of kinds of dispersed particle on the secondary grain growth behavior and annealing textures in hot-rolled dispersion strengthened molybdenum sh…
Dielectric superlattices are characterized by the structural variability of the film periodicity additional to the stochiometry. They have interesting dielectric properties different from the solid solutions of the same overall composition. In this paper the structural and dielectric properties of BaTiO3/SrTiO3-superl…
The optical performance and radiation stability of HR193nm - SiO2/Al2O3 – coatings deposited by different technologies (RE, PIAD, IBS) were systematically evaluated and causes for the low LIDT at 193nm compared to 248nm were investigated.
Changes of phase transformation temperatures of a NiTi alloy have been investigated under non-isothermal conditions by using a differential scanning calorimeter (DSC). It has been found that the duration for phase transformation declines exponentially with increasing the heating rate. The specific heat capacity of the…
Superplastic behavior of a duplex stainless steel has been studied at 1223 K (950°C) and 1253 K (980°C) for initial strain-rates ranging from 2x10 -4 s -1 to 8x10 -3 s -1 In the given range of temperature, it was observed that the elongation increased as the strain rate decreased The best superplastic conditions were…
This article covers the various materials aspects of the shape memory alloys that go into the design of fastening devices. A brief overview of the shape memory phenomenon and the martensite transformation during free and constrained recovery has been given to clarify the role of the martensitic transformation in the s…
Accurate calculations for the phonon dispersion relations of single wall armchair and zigzag nanotubes are presented. The calculations are performed using a plane wave basis set and density functional theory (DFT). The dependency of Raman active and infrared active modes on the radius is investigated in detail. To acc…
In this paper we describe the development of Cu/CeO 2 /YSZ anodes for solid oxide fuel cells (SOFCs) that are active for the direct electrochemical oxidation of dry hydrocarbon fuels. A novel method for synthesizing thin-electrolyte, anode-supported cells is described. This method uses tape-casting of YSZ layers with…
The liquid phase separation techniques is adopted to coat AN with ployvinyl butyral (PVB). The properties of the coated AN are studied. The results show that the effect of coating is good. Absorbtivity and Caking capability have greatly reduced. The absorption peak of crystal transition of ⅡⅢ shifts to higher tempera…
Herein a preparation of foam ceramics is reviewed:the foam impregnated with slurry based on its being piled up,the apparent porosity depends on the degree of the pile,effect of the different additives and the sintering conditions on the properties of the clay foam ceramics are investigate,the finally apparent porosity…
Laboratory experiments for the kinetics of periphyton growth were conducted to find out the effect of hydraulic characteristics on the production and the detachment of periphyton, in which the amount of periphyton and the rate of detachment were measured. The results of the experiments show that the growth rate of per…
Based on the Debye relaxation theory, the temperature dependence of relaxation time can be obtained from the temperature dependence of dielectric loss. Then the relaxation activation energy Q and the pre-exponential factor τ0 can be calculated. The values of Q of four typical relaxor ferroelectrics: disordered (degree…