Materials Literature
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The stability of the magnetic properties of Sm/sub 2/Co/sub 17/-type magnets at high operating temperatures was investigated by magnetic measurements at room temperature (RT) and high temperatures (HTs). The coercivity at RT is changed by the HT measurement and starts to decrease after measurements above 400/spl deg/C…
Microstructural attributes such as grain size d and dislocation density /spl zeta//sub d/ affect the hysteretic magnetic properties of steels because they affect domain wall movement and pinning. In an earlier paper, a model was proposed for computing hysteresis loops based on the effect of grain size and dislocation…
In the present study, dynamic compression tests have been performed on polycarbonate (PC) specimen for strain rates in the range of 500 to 2000s -1 and on aluminum for a strain rate around 1300s -1 using a Split Hopkinson Pressure Bar (SHPB). Temperature measurement has been carried out using a fast response infrared…
One-phonon visible-range Raman spectra of a-C: H〈Cu〉 and a-C: H〈Co〉 composite films with comparable metal and carbon contents were studied in the frequency region 1200–1700 cm−1 including the carbon sp 2-bond vibrations. Broad bands G and D characteristic of unmodified a-C: H films, as well as some additional features…
Cobalt Y-type hexaferrites are of interest as high permeability /spl mu/ materials in the miniaturization of integrated circuits. We oriented particles of sintered Co/sub 2/Y-type hexaferrite with c-axis normal to the slab plane. We measured the magnetic properties of Co substituted Y-type hexaferrites (Co/sub 0.25/Zn…
Abstract In our multi‐frequency EPR study of Cr 3+ doped PbTiO 3 nanopowder samples with varying mean particle size, three paramagnetic Cr 3+ centres (C1, C2, C3) with different axial fine structure (FS) parameters are identified, with one of them (C1) being compatible with former literature measurements on bulk and c…
Activated carbon with a high adsorption capacity for the removal of organic compounds from aqueous solutions was made from phosphoric acid-activated peanut shells. Adsorption isotherms for the uptake of phenol, iodine, Methylene Blue and tannic acid were obtained at 22°C. Freundlich, Langmuir and previously developed…
Two wet‐chemical routes have been used to synthesize Sc 2 O 3 nanopowders from nitrate solutions employing ammonia water (AW) and ammonium hydrogen carbonate (AHC) as the precipitants. The precursors and the resultant oxides are characterized by elemental analysis, X‐ray diffractometry, differential thermal analysis/t…
The objective of this study was to quantify copper-, bacteria- and bacteriophage-binding capacities of natural clay with the aim of predicting the adsorption of heavy metals, human pathogenic bacteria and viruses by a clayey landfill liner. X-ray diffraction analysis of six natural clays showed that the dominant phase…
The authors report a simple method to fabricate cobalt nanoparticles with homogeneous spherical shape and narrow size distribution, which can be easily scaled up for large quantity production. The method is based on conventional chemical reduction method by using NaBH/sub 4/ as areducing reagent; however, the process…
The taxonomic status of Sulfolobus hakonensis Takayanagi et al. 1996 was re-evaluated by fresh determinations of the 16S rDNA sequence and G+C content of the genomic DNA of the type strain, HO1-1(T). The 16S rDNA sequence of strain HO1-1(T) showed 98 % similarity to those of two Metallosphaera species and only </=92 %…
An investigation was conducted to examine adiabatic shear band formation under a pressure of 1.5 GPa with a modified version of the hat specimen. Using tungsten alloy data generated with a symmetric Taylor test, the influence of pressure on the critical strain associated with adiabatic shear handing formation was foun…
The inhibition of copper corrosion by 1,3,4-thiadiazole-2,5-dithiol (bismuthiol), under 0.5 M HCl at 25 C, was studied by means of the potentiodynamic polarization technique. It was found that bismuthiol was chemically adsorbed on the copper surface, and follows a Langmuir isotherm. The inhibition mechanism was found…
This paper is concerned with the energy absorption efficiency of auto-body side Structures for the conventional steel and 60TRIP high strength steel. In order to evaluate the energy absorption efficiency, the dynamic crash analysis is carried out with the regulation of US-SINCAP. The analysis adopts the Johnson-Cook m…
A batch anaerobic composting process was investigated to evaluate the potential for biogas recovery from animal manure under the worst scenario of high initial solids and non-well adapted microorganisms. The effects of composting time and initial total solids content on biogas recovery and reduction of solids during a…
Abstract In this study it is shown that the epoxide derivative of oleic acid, methyl 9,10‐epoxyoctadecanoate, is readily hydrolyzed to a diol when exposed to a commercial preparation of neutral alumina. Comparison of 1 H and 13 C NMR spectra of the diol with those of standards showed that the product was the threo iso…
The data are presented on optimization of cellulose synthesis by Acetobacter xylinum (strain VKM V-880) and the structural characteristics of A. xylinum cellulose gel film synthesized during static cultivation. The structural changes caused by the removal of water from gel films are established and the structural orga…
We present in situ (x-ray diffraction) and ex situ (quenching) structural studies of crystalline, liquid, and glassy B 2 O 3 up to 9 GPa and 1700 K, drawing equilibrium and nonequilibrium phase diagrams of B 2 O 3 . Particularly, we have determined the melting curve, the stability regions for crystalline B 2 O 3 I and…
Abstract The effect of modified flax fibers by plasticizer absorption in poly(L‐lactic acid) composites was investigated. The plasticizes chosen were triethyl citrate (TEC), tributyl citrate (TBC) and glycerol triacetate (GTA), which were derived from natural sources. Characterization was performed by differential sca…
The high‐temperature performance of a Nextel‐720 fiber/Al 2 O 3 composite in air and water vapor at 1100°C was investigated using X‐ray photoelectron spectroscopy (XPS) and thermodynamic calculations. In the presence of water vapor, the formation of volatile Si(OH) 4 was responsible for the loss of mullite phase in th…