Materials Literature
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A series of unsupported nickel–copper catalysts with various Ni/Cu ratios has been prepared by coprecipitation and characterized by thermomagnetometry, (TM), temperature programmed reduction (TPR) and oxidation (TPO) and scanning electron microscopy (SEM). It was found that the magnetization of the nickel–copper catal…
Structure and mechanical properties of the intermetallic compound NiMn alloyed by Ti and Al have been studied using optical and transmission electron microscopy, X-ray diffraction and dilatometry. Alloying has been found to reduce the temperature of β ↔ θ martensitic transformation, the martensite tetragonality and th…
The protonation of 2,3-dimethoxy-5-methyl-1,4-benzoquinone (UQ 0 ) has been determined to improve the quantum efficiency of charge separation between a zinc meso-tetra(4-sulfonatophenyl)porphine (MP) donor and UQ 0 (UQ 0 H + upon protonation) acceptor system. The primary effect of protonation is to increase the drivin…
The cyclo cocondensation of triethylenetetramine with arylpyruvaldehydes is templated by iron(III) chloride, to give a [12]aneN4 type diimine complex intermediate which may be reduced and demetallated in situ with sodium borohydride giving the saturated [12]aneN4 metal-free macrocycle in up to 60% overall yields; phot…
In the coordination field calculation of rare-earth ions, the D 2 point group basis functions were classified and labeled according to the relation of the point group chain R (3)* ⊃ O * ⊃ ⊃ The perturbation matrix elements of the coordination field for the rare-earth complexes in the dihedral field were systematically…
Tribological behavior was evaluated for polyolester base oil and the formulated oils in some HFCs and HCFC refrigerants environment. HFCs as well as R-22 showed the boundary lubricating effect depending upon the solubility of gas in the oil. Thus, higher gas pressure of the refrigerants improved the wear resistance. A…
The phase behavior of ( S )-ovalbumin in aqueous ethanol and (NH 4 ) 2 SO 4 solutions (pH 7.0) was investigated for temperatures ranging from 20 to 90 °C. The various morphologies observed were presented on ternary phase diagrams. At 20 °C, three morphologies were observed in aqueous ethanol: one-phase liquid, one-pha…
Effects of various boride former elements (Ta, W, Nb, Ti, Mo) and/or B on recovery and recrystallization of reverse-transformed austenite were examined in carbon-free Fe-19mass%Ni alloys. The combined addition of Nb and B was found to be the most effective in suppressing them; the recrystallization temperature of the…
Methionine is one of the 20 amino acids, and one of the two sulfur-containing amino acids. Observations of chemical shifts in various constituents of methionine are important in determining its interaction with a surface in a thin film. As such, spectra of bulk films of methionine, as in this work, serve as a baseline…
Commercial polypropylene pipes for water transport were aged in air at 135 °C and in water at 95 °C for up to 3000 and 4000 h respectively. The protection effect of the antioxidant in the polymer was investigated by measuring the oxidation induction time (OIT) and by determining the chemical changes in the aged polyme…
The powder of supersaturated solid solution of Al-7.8 at%Ti-0.3 at%Fe with a nanocrystalline structure was prepared by mechanical alloying, and it was compacted to columnar shape material at low temperature by application of high pressure of 3 GPa. Diffusion of copper was studied in this compacted nanocrystalline mate…
The NZP family, which gets its name after the prototype composition NaZr2P3O12, has received much attention in recent times because of their very low coefficient of thermal expansion (CTE), controlled lattice thermal expansion anisotropy, fast ionic conductivity, high thermal and chemical stability and flexibility tow…
The behavior of surface and trapped charge that originates during contact electric-field poling of thin films of optically nonlinear polymers has been investigated. Thin films of poly(methyl methacrylate) doped with two different tricyanothiophene chromophores have been studied during and after the poling process by s…
The level of acetate-group surface segregation in poly(vinyl alcohol- co -vinyl acetate) (PVA−PVAc) films was found to depend markedly on the functional group distribution along the backbone (blockiness). PVA−PVAc polymers with both random and blocky distributions were prepared at levels between 2 and 12 mol % acetate…
Alkali-slag cements consist of glassy slag and an alkaline activator and can show both higher early and later strengths than Type III Portland cement, if a proper alkaline activator is used. An examination of microstructure of hardened alkali-slag cement pastes with the help of XRD and SEM with EDAX shows that the mai…
Abstract An update on the examination of the sequence of crossed lines, specifically, between ball point pen strokes (waterfast glycol and aqueous based inks) and faint typewritten impressions (produced by old, poor quality fabric ribbon), utilizing a contemporary Hitachi S-2500 SEM and photographic stereoscopic pairs.
The optical dielectric function of silver is measured by excitation of surface plasmon-polaritons on a silver-covered silica grating for a range of wavelengths in the visible region of the spectrum. By exciting the surface plasmon-polariton at the grating/silver interface the silver is protected from sulphidization an…
The objective of this paper is to introduce a new method for yarn-diameter and yarn-evenness measurement. The relationship between the diameter of a yarn with a circular cross-section and the output voltage of a sensor device is first derived. The yarn cross-section is then analyzed and the ellipticity of its best-fit…
The hydrothermal syntheses of Cs2(WO3)3PO3CH3, Rb2(WO3)3PO3CH3 and (NH4)2(WO3)3PO3CH3, three new non-centrosymmetric, layered tungsten(VI)-containing phases, are described. The crystal structures of Cs2(WO3)3PO3CH3 and (NH4)2(WO3)3PO3CH3 were refined by using Rietveld analysis of powder diffraction data. These phases…
An acoustic system, defined as a liquid-filled piezoceramic shell with an asymmetric internal insertion, is considered. The mathematical model is formulated. The problem of sound radiation by such a system is solved using the partial domains method. The acoustic characteristics of the system for a number of insertions…