Materials Literature
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A mean rate controllable random pulser to use for a random pulse train simulator is presented in this paper. The control of the men rate is practiced with a personal computer by referring to the look-up table of time-variant rate. The random pulser with present design can be used as a model to simulate the random puls…
In the present work, the cohesive energy, energy fluctuation and Mulliken’s population of metal cluster have been calculated by the extended Hückel method. The behaviors of alloying elements and the stability of Mg alloys at high temperatures have been discussed by comparing the calculated results with the actual expe…
Eutectic composite of Al2O3/Y3Al5O12 (YAG) was prepared by an arc discharge method and its microstructure and stability were investigated. The eutectic composition of Al2O3/YAG determined by electron probe micro analysis (EPMA) was Al2O3:Y2O3=81.6:18.4mol%. Basic eutectic microstructure was a twinned single crystal of…
Environmental concern decreases consumption of organic solvents as a global trend. Silicones for release coating are also requested to move to solventless type from solvent type. In fact 80% of silicones for release coating application is already solventless type in North America and Europe. On the other hand, solvent…
The In-Ti active fillers were examined for joining metallic copper (Cu) to aluminum nitride (AlN) ceramics. Brazing was carried out with In-Ti active brazing filler metals with various compositions, and the microscopic structure and mechanical strength of the Cu-filler-AlN-filler-Cu joint at various temperatures were…
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…