Materials Literature
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Simultaneous synthesis and densification of α-Zr (N) (hexagonal) from zirconium powder compacts are achieved by self-propagating combustion under high nitrogen pressures. Nitrogen contents increase from 12.2 to 23.5 at% with decreasing compacting pressure and increasing nitrogen pressure. The material with the highest…
This paper considers the efficiency of electrostatic charging of water-sprayed fibers during the melt-blowing process. Two charging methods were used to charge the fibers near the die exit and the fabrics after the collector. Both showed that the charging efficiency was not affected by the water-spraying process if th…
Sheets from blends containing liquid crystalline polymer (LCP) and bisphenol-A polycarbonate (PC) were prepared using a twin screw extruder at various take-up speeds. Thermal behavior, mechanical properties, and viscoelastic properties of sheets with various compositions were investigated using differential scanning c…
Catalytic effect of metal ions: Cr(VI), Cr(III), Cd(II), V(V) and chloride anion, on the oxidation of S(IV) in aqueous solution, at concentrations of metal ions and S(IV) usually found in urban atmospheres, were studied under controlled experimental conditions (pH (2.1 - 4,5), T (25.0 - 35.0 °C), air flow rate, concen…
The development of a practical solid oxide fuel cell (SOFC) requires an improvement in cell performance and a manufacturing technology suitable for mass production. In particular, tubular type SOFC is thought to be superior in its reliability because the configuration avoids high temperature sealing and reduces the th…
The kinetics of phase separation in 15Na2O⋅85B2O3 binary glass was investigated using 11B nuclear-magnetic-resonance (NMR) spectra together with X-ray diffraction (XRD) and scanning electron microscopy (SEM). The experimental results showed that the product of sodium-rich phase after heat-treated at 500°C was not Na2O…
The Nuclear Safety Commission (NSC) derived the unconditional clearance levels for concrete and metal arising from the operation and dismantling of nuclear reactors. The Japan Atomic Energy Research Institute conducted technical analyses to support the discussion by NSC. The clearance levels of 20 radionuclides were d…
Corrosion behaviours of mild steel were investigated by measurement of corrosion loss and stress corrosion cracking tests in methanol and its solutons containing formic acid. In methanol solution containing 0.5% formic acid, corrosion rate was maximum at the composition of approximately 98% methanol with 2% water and…
Ring-opening insertion polymerization of ε-caprolactone is retarded in dimethylformamide when catalysts such as dibutyl tin oxide, zinc acetate and titanium tetrabutoxide are employed.
The reaction of certain phenyl nitronyl nitroxide derivatives with strong acceptors such as TCNQF4 or TCNQ in appropriate solvents give the corresponding imine nitroxide derivatives by an anomalous deoxygenation reaction with acceptors in a selective manner.
Surface enhanced Raman scattering studies are carried out for 1,4-diaminoanthraquinone dye [1,4-DAAQ] in Ag colloid in order to understand the enhancement effect and the nature of interaction between the dye molecule and Ag surface. Detailed analysis of the enhanced vibrational bands in the SERS spectrum shows that th…
Workhardable materials like high speed tool steels and super alloys have low ductility and narrow range of temperature suitable for rolling. In the hot profiled rolling of these materials, prevention of cracking in roughing process is significant technique. Considering the strong temperature dependence of deformabilit…
For epitaxial Cu/Ni/Cu/Ni/sub 60/Cu/sub 40//Cu[001] and Cu/30 /spl Aring/ Ni/Cu/Ni/Cu[001] structures, the in-plane lattice parameter of the Cu spacer layer is found to increase with its thickness. The Ni in-plane lattice parameter becomes larger with increasing Cu spacer thickness. Cu/Ni/Cu/Ni/sub 60/Cu/sub 40/[001]…
The shear thinning effect was studied for the fluoroapatite glass-ceramics containing isometric crystals (denoted as series 1) and those containing needle-like crystals (denoted as series 2). During extruding of series 2, a two-stage decrease in viscosity was observed by increasing shear rate. The first drop in viscos…
Exciplex formation dynamics of photoexcited copper(II) tetrakis (4‐ N ‐methylpyridyl) porphyrin (Cu(II)(TMpy‐P4)) with added poly(dA‐dT) 2 and poly(dG‐dC) 2 has been investigated by using femtosecond transient absorption and nanosecond and picosecond transient Raman spectroscopic methods. It was observed that the deca…
The characterisation of the local structure of disordered materials is one of the major applications of x-ray absorption fine structure (XAFS) spectroscopy. XAFS site sensitivity has been widely exploited to describe the radial distribution around specific types of atoms in multicomponent systems such as doped borate…
The first-order Raman spectra of Eg (2) (186cm-1) and Eg (4) (1385cm-1) modes in NaNO3 crystal were measured in the temperature range of 77-473 K and the linewidths at these temperatures were obtained. The temperature dependence of the linewidths was analyzed using the phonon dispersion curves calculated on the basis…
The effect of porosity on the elastic constants for X-ray stress analysis in sintered alumina was analyzed on the basis of four micromechanics models: Reuss' model, Voigt's model, Mori-Tanaka's model (MT model) and Self-consistent model (SC model). The X-ray elastic constant E'X/(1+v'X(E'X=Young's modulus, v'X=Poisson…
"This paper presents a study of porous silicon layer of » 1 mm thickness, formed electrolytically in crystalline p-Si, by Xray diffraction at grazing incidence, photoluminescence (PL) at 6 K and room temperature, C-V measurements, and charge version of deep level transient spectroscopy (DLTS). The C-V measurements per…
We have investigated magnetization and magnetic anisotropy in Ni/Pd multilayer films, prepared by dc magnetron sputtering at 7 mTorr Ar sputtering pressure. Interestingly, enhanced magnetization was found in this system, due to the polarization of Pd. Delicate in situ stress and ex situ magnetostriction measurements w…