Materials Literature
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Well-defined CoFe/sub 2/O/sub 4/ nanoparticles embedded in an amorphous SiO/sub 2/ matrix have been synthesized by a sol-gel method, characterized and investigated by Mo/spl uml/ssbauer spectroscopy and magnetic properties measurements. The mean particle size increases from 3 to 15nm consistently with the temperature…
xFe/(100-x)(NiZnCu)Fe/sub 2/O/sub 4/(x: wt%) composite films were prepared by the aerosol deposition (AD) method. The as-deposited x=80 film exhibited the maximum relative permeability of /spl mu//sub rmax/"=18 at around 450 MHz. The AD film also showed /spl mu//sub r/"=9 at 3 GHz, which were comparable to the values…
The influence of prior cold work on age hardening behaviour of solution treated (ST) Cu–3Ti–0·1Zr and Cu–4Ti–0·1Zr alloys subjected to cold deformations of 50, 75 and 90% has been investigated by hardness and tensile tests and optical as well as transmission electron microscopy. Hardness of Cu–3Ti–0·1Zr and Cu–4Ti–0·1…
Illite crystals in siliciclastic sediments are heterogeneous assemblages of detrital material coming from various source rocks and, at paleotemperatures >70 °C, of superimposed diagenetic modification in the parent sediment. We distinguished the relative proportions of 2M 1 detrital illite and possible diagenetic 1…
Pebble bed reactors are characterized by multipass fuel systems in which spherical fuel pebbles are circulated through the core until they reach a proposed burnup limit (80000-100000 MWD/MTU). For such reactors, the fuel is assayed on-line to ensure that the burnup limit is not breached. We considered assaying the fue…
Magnetic NdFeB thick films were prepared by screen printing an NdFeB-based ink. The films are isotropic and the thickness varied from 30 /spl mu/m to 1 mm. The printing parameters were optimized with respect to the mechanical and magnetic properties of the films. After curing at 120/spl deg/C good adhesive nonporous f…
The adhesion between polyethylene terephthalate (PET) cord and nitrile-butadiene rubber (NBR) has been compared. The PET cord treated by hydrated silica-resorcinol-hexamethoxymethylmelamine (HRH) shows 300% T-test strength and 40% H-test strength adhesion to NBR higher than that of rescorcinolformaldehyde-latex (RFL)…
The X-ray structure of H2T(3-Py)P·HgI2·C60, cocrystallized from a chlorobenzene/methanol solvent mixture containing 5,10,15,20- tetra(3-pyridyl)porphyrin, HgI2 and C60, has been determined. A new two dimensional arrangement of the tetra(3-pyridyl)porphyrin molecules joined by coordination to HgI2 is formed. These asse…
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Poly(ethylene terephthalate) (PET) and poly(butylene terephthalate) (PBT) samples uniaxially drawn above Tg and beyond the yield point exhibit significant differences in their molecular orientation behavior as probed by polarized Raman spectra. The quasi-amorphous PET samples, drawn close to the Tg, manifest considera…
Relationships between magnetic properties and microstructure in surface hardened steel were studied through measurements and model simulations, with the objective of developing techniques for quantitative measurements of case depth of surface hardened steels. The depth profiles of the magnetic properties were found to…
The dynamic characteristics of field emission from nanocarbon films subjected to microsecond electric field pulses are studied. The emission curves exhibit hysteresis the parameters of which are complicated functions of the pulse amplitude, length, and shape. The experimental results are explained based on a phenomeno…
By using thermally stimulated depolarization current (TSDC) technique, and coupling it with the thermal sampling (TS) method, the relaxation behavior of Poly(vinyl chloride-co-vinylacetate-co-2-hydroxypropyl acrylate) (PVVH) has been investigated in the vicinity of its glass transition temperature, Tg. The global TSDC…
Complex permittivity, permeability, and electromagnetic wave absorption properties of resin compacts containing 50 vol% composite powders of /spl alpha/-Fe/Y/sub 2/O/sub 3/, FeCo/Y/sub 2/O/sub 3/, and /spl alpha/-Fe/Fe/sub 3/B/Y/sub 2/O/sub 3/ were investigated in this study. Real part (/spl epsiv//sub r/') and imagin…
The NMR structure of the conserved hypothetical protein TM0487 from Thermotoga maritima represents an alpha/beta-topology formed by the regular secondary structures alpha1-beta1-beta2-alpha2-beta3-beta4-alpha3- beta5-3(10)-alpha4, with a small anti-parallel beta-sheet of beta-strands 1 and 2, and a mixed parallel/anti…
Polycrystalline perovskites compounds HoMn/sub 1-x/Co/sub x/O/sub 3/ (x=0--0.8) have been prepared by conventional solid-state reaction. Here, we used far-infrared (FIR) spectroscopy to study infrared active phonon modes and present a comparative analysis of infrared transmission spectra of polycrystalline HoMn/sub 1-…
Rapid thermal crystallization of silicon films with a heating layer of diamond-like carbon (DLC) films is reported. DLC films 200 nm thick have an optical absorbance higher that 0.7 for wavelengths shorter than 1000 nm. They are also heat resistant to about 5000 K. A crystalline volume ratio of 0.85 is achieved for si…
The crystal structure of NaMgF 3 perovskite (neighborite) has been studied at 4 GPa and temperatures up to 1000 °C using the Rietveld structure-refinement method. In situ synchrotron X-ray powder diffraction data was collected using monochromatic radiation. The orthorhombic (Pbnm) to cubic (Pm3̅ m) transition was obse…
The weak viscous oscillations of a bubble are examined, in response to an elongation that perturbs the initial spherical shape at equilibrium. The flow field in the surrounding liquid is split in a rotational and an irrotational part. The latter satisfies the Laplacian and can be obtained via an integral equation. A h…
Complex system ceramics Pb(Sc(1/2)Nb(1/2))O3-Pb(Mg(1/3)Nb(2/3))O3-Pb(Ni(1/2)Nb(1/2))O3-(Pb0.965,Sr0.035) (Zr,Ti)O3 (PSN-PMN-PNN-PSZT abbreviated PSMNZT) have been synthesized by the conventional technique, and dielectric and piezoelectric properties of the ceramics have been investigated for ultrasonic medical transdu…