Materials Literature
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The effects of Zr and Co substitutions for Fe on the magnetic properties of nanocrystalline near-stoichiometric (Nd/sub 0.75/Pr/sub 0.25/)/sub 12/(Fe/sub 1-x/Co/sub x/)/sub 82-z/Zr/sub z/B/sub 6/ (x=0,0.1,0.2 and z=0-4) alloy ribbons are reported. The nanoscale structures were derived by devitrification annealing of a…
We have studied the processes of photocoloration and discoloration in Mn:YAlO3 and relevant crystals. We show the following: (1) The coloration rate in Mn:YAlO3 does not depend on Mn concentration. (2) The effective recombination time of free electrons with Mn5+ ions and deep traps is of the order of ≈0.5 ms. (3) The…
The molecular associations of N-( n-hexyl)hexanamide (PA-12MC) and N-( n-butyl)benzenesulfonamide (BBSA), taken as model compounds for polydodecamide (PA-12) and benzenesulfonamide plasticizers, respectively, were examined by Fourier transform infrared spectroscopy. In solution, the amide is distributed between a self…
Submersed macrophytes are real w ater plants because they are rooted in sediment and can complet e their grow t h and reproduction inside t he overlying w ater.P roviding a linkage bet ween w ater and sediment, t hey have t he closest int eraction w it h w ater environment.T his interact ion is very complicat e partly…
Abstract The radiation polymerization of hydrophilic hydroxyethyl methacrylate monomer solution at temperatures below 0 ° C leads to the formation of a porous structure in the polymers. The melting peak of the eutectic water–monomer composition at the eutectic point (above − 24 ° C ) could be distingushed and a glass…
Two novel series of bent-shaped achiral azo compounds with the following molecular structures have been synthesised and characterised.
Linear polysiloxanes bearing 3-chloropropyl groups pendant to the polymer chain and containing a vinyl functional group at one chain end were synthesized by anionic ring polymerizations of 2,4,6-tri(3-chloropropyl)-2,4,6-trimethylcyclotrisiloxane, 1, and 2-(3-chloropropyl)-2,4,4,6,6-pentamethylcyclotrisiloxane, 2, ini…
The possible use of an FT-IR imaging system for surface studies of atmospheric corrosion products on zinc and nickel samples has been explored. Samples have been exposed in an urban site located at Rouen in France. Corrosion products, detected by means of energy-dispersive spectrometry/X-ray diffraction (EDS/XRD) and…
We fabricated a planar-type film inductor with good high frequency characteristics using a FeTaN soft magnetic film. While FeTaN films inherently show good soft magnetic properties and high saturation magnetization, addition of Ti underlayer with a combination of magnetic field annealing leads to an increase of anisot…
Aspartate aminotransferase from an extremely thermophilic bacterium, Thermus thermophilus HB8 (ttAspAT), has been believed to be specific for an acidic substrate. However, stepwise introduction of mutations in the active-site residues finally changed its substrate specificity to that of a dual-substrate enzyme. The fi…
Transmission electron microscopy (TEM) of yttria (Y2O3)-cubic-stabilized zirconia with an yttria content between 24 and 32 mol% reveals diffuse electron scattering. Analysis of the diffuse intensity maxima in electron diffraction patterns recorded with the incident electron beam along (112)c or (110)c zone axes sugges…
By reacting manganese nitrate and sodium hydroxide at pH/spl sime/12 and heating the product at 400/spl deg/C for 3 hrs, Mn/sub 5/O/sub 8/ with crystallite size /spl sime/14 nm and the Cd/sub 2/Mn/sub 5/O/sub 8/ structure is produced, as confirmed by x-ray diffraction. Magnetic state of Mn/sub 5/O/sub 8/ is investigat…
Structural studies have confirmed that it is possible to exploit the relatively low nucleophilicity of the “external” amino substituents on the CoIII complex of 1,8-diaminosarcophagine (“sarcophagine” = sar = 3,6,10,13,16,19-hexaazabicyclo[6.6.6]icosane) in acylation and alkylation reactions leading to a variety of fu…
Structural and magnetic analyses were made for /spl alpha/'-Fe-C (0-12 at.%C) and /spl alpha/'-Fe-N(0-12 at.%N) films. The results are summarized as follows: (1) epitaxial Fe-C films consisting of an /spl alpha/'-Fe-C single phase with a C content up to 12 at.% can be synthesized on MgO single crystal substrates by sp…
In the present study, x-ray photoelectron spectroscopy (XPS) was employed to investigate the principal core levels of a Fe2O3 thin film. The sample was deposited on glass in a N2+O2 atmosphere by chemical vapor deposition (CVD), using Fe(acac)3 (Hacac = 2,4-pentanedione) as the source compound. XPS surface data for th…
Textured alumina has been fabricated previously by either hot‐deformation processing, to produce moderate texture, or templating with aligned platelets, to produce stronger texture. Fracture‐toughness measurements on ceramics fabricated by hot deformation have indicated only a modest improvement in toughness compared…
From MnZn ferrite ("6H20" of FDK production), cores having grain size of about 8/spl sim/10 /spl mu/m were produced by controlling the calcination temperature, after-calcination milling time, and sintering conditions. The ferrite powder production conditions and core microstructure were examined to determine their eff…
Abstract Previous research work in our laboratory has indicated that the efficiency of certain flame‐retardant fibres can be further enhanced if certain interactive intumescents are dispersed on their surfaces. In our previously reported work we have successfully observed interactions between certain commercially avai…
Beryllium oxide crystals are studied by time-resolved optical and luminescence vacuum-UV spectroscopy. The low-temperature luminescence spectra and the luminescence decay kinetics (2.5–10 eV, 1–500 ns) upon selective photoexcitation, and also the luminescence excitation and reflectivity spectra (8–35 eV), are analyzed…
Self-passivated copper as a gate electrode in the form of TiO/Cu/TiO/TiN/SiO2 has been obtained by annealing Cu/Ti/TiN/SiO2. The thickness of Ti in Cu/TiTiN was optimized at 150 Å by forming an 80 Å continuous TiO film on the outer surface of the Cu. The multilayer of SiO2/TiO/Cu/TiO/TiN/SiO2 showed stable electrical…