Materials Literature
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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…
The microscopic Ising-like model of the order-disorder phase transition in improper ferroelastic crystals is presented. For such a system, the spin-strain coupling can be written in terms of four-spin interactions. Three-dimensional Monte Carlo simulation shows that for a certain strength of the four-spin interaction…
This paper has reported on the development of an accurate finite element model of an induction motor suffering from rotor faults. The model has been used to provide a clearer understanding of how such faults are manifest in the line current and should therefore aid the development of more accurate condition monitoring…
A model is described for the densification of particulate reinforced ceramic matrix composites when the degree of shrinkage is large. A rule of mixtures model can be used to describe the degree of densification in cases where there is no interfacial reaction between the reinforcement and the matrix. The model is illus…
There has been much recent discussion on the issue of the deposition and release of macromolecular structural data [see editorials in Nature, 391, 617 (1998) and Nature Structural Biology, 5, 83±84 and 165±166 (1998) and the letter from Wlodawer et al. in Science, 16 January 1998]. These editorials and letters rightly…
In order to clarify wire diameter dependency of corrosion rate of steel wires, which have been widely used in various fields, immersion tests and polarization tests in pH 5.9 and pH 2.5 NaCl solutions were conducted to high carbon steel wires with 0.1 to 1.0mm in diameter. It was found that the corrosion rate was larg…
An improvement of methods in fibroin hydrolysates preparation significantly enlarges their applications to practical use. Acidic hydrolysis by hydrochloric acid is one of the methods for silk fibroin depolymerization. A low yield of final product and long time of the process are the demerits of this method. Possibilit…
Cleansers for the human skin are characterized by their delipidizing, dehydrating and protein-influencing effects. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.