Materials Literature
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Resumen es: La via de disolucion electroquimica directa se ha utilizado para la preparacion de complejos de ftalocianina y cuatro lantanidos (lantano, neodimio, pr...
The gas-phase catalytic oxidation of benzyl alcohol was carried out over low [CeL, ∽1×10-2 mmol (g-NaZSM-5)-1] and high [CeH, ∽1–2 mmol (g-NaZSM-5)-1] Ce supported NaZSM-5 zeolites and alkali metal added counterparts. The Ce was supported on NaZSM-5 zeolites by both ion-exchange (CeL-NaZSM-5) and impregnation (CeL- an…
Mechanical alloying (MA) of elemental powder mixtures, with an Fe-9.85 mass%N alloy powder as the nitrogen source, of the composition of Cr–Mn type stainless steels was carried out in an Ar atmosphere using a conventional planetary ball mill. In the MA processing of Fe79−x−yCr18MnyMo3Nx (mass%) (x=0.45 and 0.9; y=5–18…
A spin cast film of poly(hexamethylene adipamide) (Nylon 6,6) was analyzed by XPS using monochromatic Al Kα excitation. The measured atomic composition closely matched the expected stoichiometry of the polymer. Peak positions of the individual chemically shifted C 1s, O 1s, and N 1s components are reported. The result…
When studying the structural properties of highly entropic materials, the usual criteria for the choice of the time step, the stability of the energy and the pressure, are not always appropriate as they may lead to a time step which is an order of magnitude too large. Two different methods, the stress-strain and equil…
Chitosan is poly-β(l→4)-2-amino-2-deoxy-β-D-glucan (Figure 13.1), deacetylated chitin. Chitin is widely found in crustacean shells, fungi, insects, annelids, mollusks, coelenterates, etc. (Muzzarelli 1990). Chitosan is produced commercially from chitin, the major component of crustacean shells, most often from shrimp-…
We investigated the frequency characteristics of permeability for an Fe-Si-Al flakes/polymer composite which has dual frequency dispersion in permeability. From the relation of Curie temperature to the powder surface area, it was found that the mother alloy composition changes with progress of attrition to excess Fe,…
The aim of this article is to provide a comprehensive review of specific problems and deficits in the monitoring and dosimetry of thorium intakes. Thus, the known monitoring methods are critically discussed in respect of their detection selectivity for realistic intakes of 232 Th and their detection sensitivity in gen…
We performed high-field magnetization measurements for the aligned powder of a high-quality Sm2Fe17N3.1 at 4.2 K up to 23 T. The result indicates a strong anisotropic behavior in the magnetization curves along the parallel and perpendicular directions to the aligned one. From the hard axis-magnetization curve, the uni…
Neutron diffraction, magnetic susceptibility and EPR spectroscopic studies of a dodecanuclear chromium cage are reported which show the molecule has an S = 6 spin ground state; this is the highest spin ground state known for a cage of this metal.
We shall review some results from several areas of oxide science in which neutron scattering and X-ray synchrotron scattering exercise a complementary role to high-resolution transmission electron microscopy. The very high-resolution time-of-flight neutron diffraction technique and its role in studies of the magnetic…
This paper presents research characterizing the leakage (incipient behaviour) of single and multiple distribution insulators through staged experiments. Four sets of field experiments were conducted over a two year period in which single and multiple insulators were artificially contaminated and energized on a lateral…
New cooligomers 5 of styrene and 4-vinylpyridazine have been prepared by the controlled free radical polymerization technique. The addition of spirocyclopropene has led to cooligomers 6 in which the pendant pyridazine subunits are transformed into photochromic spirodihydroindolizines. Characterisation by NMR and SEC w…
Dielectric properties of surface stabilized ferroelectric liquid crystal (SSFLC) cells have been investigated both experimentally and theoretically. The thickness mode is found to consist of two relaxation processes. A decomposition of an analytical solution of the complex dielectric permittivitye(v) in terms ofthese…
The picosecond time-resolved spectroscopy is carried out to clarify the physical origin of the central peak that has been reported in uniaxial ferroelectric triglycine sulfate $({\mathrm{NH}}_{2}{\mathrm{CH}}_{2}\mathrm{COOH}{)}_{3}\ensuremath{\cdot}{\mathrm{H}}_{2}{\mathrm{SO}}_{4}$ (TGS). An ultraslow relaxational m…
The influence and the role of alkali metals added to Cu ion-exchanged NaX (Cu–NaX) catalysts on the gas-phase catalytic oxidation of benzyl alcohol were examined based on the oxidation results, O2 uptakes and insitu IR measurements. The addition of alkali metals to the Cu–NaX catalyst particularly promoted the catalyt…
Polyhydroxyalkanoate biosynthesis genes of Aeromonas caviae were expressed in Escherichia coli LS5218 (fadR atoC(Con)), and the polyhydroxyalkanoate-producing ability of the recombinants was investigated. A LS5218 strain harboring only phaCAc (polyhydroxyalkanoate synthase gene) did not accumulate any polyhydroxyalkan…
Fractography of AISI 316 unstabilized austenitic stainless steels, after tensile testing,is the main topic of the present work. To characterize relationships between the steelmicrostructure, mechanical properties, and fracture mode, methods of light, scanning, andtransmission electron microscopies were used. The trans…
The thermal decomposition behaviors of polystyrene, its derivatives, and polyolefins were investigated by thermogravimetric method in which gas chromatography and/or mass spectrometry are interfaced. Decomposition products of polystyrene and poly(p-methyl styrene) were found to be predominantly monomers with a few dim…
The diatomitic sediments in Falconara (6.93 to 6.08 Ma) have a total thickness of c. 27 m, and the sequence is composed of 41 diatomite/claystone couplets. The deposition of these biosiliceous sediments, seemingly modulated by the astronomical precession cycle (21,000 years period), has been suggested to have taken pl…