Materials Literature
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Experimental evidence indicates that a large percentage of the crack development and subsequent fragmentation and heave in the blasting process is due to the effects of the high pressure gas generated by the explosive in the blasthole. An explicit finite/discrete element code has been developed to dynamically model st…
The structural properties of three-dimensional ordered phases of ${\mathrm{C}}_{3}$B and ${\mathrm{C}}_{5}$B compounds were studied using the ab initio pseudopotential method. Two different stacking sequences, BC and BB, of graphite layers were considered. Results indicate that for ${\mathrm{C}}_{3}$B, the structure w…
In order to clarify the reason for the excellent corrosion resistance of zinc-plated steel coated with magnesium which was electrodeposited from a molten salt, corrosion products in a 5 mass%NaCl aqueous solution were investigated by X-ray diffraction analysis and EPMA. It was found that thin MgO layer was rapidly for…
This paper focuses on the switching surge duties imposed on capacitors and air-cored reactors which are used in single-tuned filters at arc furnace installations. Switching surge studies are often necessary to fully rate these components. Rating guidelines are provided. An example compares conventional filter designs…
Al alloys 2024, 6061 and 7075 have been anodized in H 2 SO 4 solutions of two different concentrations and sealed in either boiling water or solutions of nickel acetate, cerium acetate or yttrium acetate at two different temperatures. The same aluminum alloys were anodized in Boeing's Boric-Sulfuric Acid Anodizing (BS…
Die-upset experiments on hot compacted commercial melt-spun powders MQP-A and MQP-B were carried out under an argon atmosphere at 500 to 800/spl deg/C with strain rates of 10/sup -4/ to 10/sup -1/ s/sup -1/. The kinetic analysis of the strain-rate stress relations yields the following dependences for the strain rate:…
The surface-enhanced Raman spectroscopy (SERS) of γ-aminobutyric acid (GABA) adsorbed on silver colloids in H2O and D2O were recorded and analyzed. When the concentration is greater than 10−3 M, the adsorbed species is the anionic form of the amino acid that interacts with the surface through both functional groups. A…
We have performed experiments to elucidate the mechanism of photosensitivity in rare-earth-doped fluorozirconate (ZBLAN) glasses. Glasses doped with Ce, Tb, Tm, and Pr were studied. Permanent holographic gratings were written in bulk samples using 248 nm light, with the strongest gratings observed in Ce:ZBLAN. Ultravi…
The paper presents experimental results of measurements of prebreakdown activity, caused by free metallic particles in GIS, obtained using a phase resolved partial discharge (PRPD) analysis and acoustical measurements. The numerous parameters characterizing prebreakdown activity of particles were identified and analyz…
The thermal behaviour of binary mixtures of 4,4′-bipyridyl and 4-[(S)-(-)-2-methylbutoxy]benzoic acid has been investigated. The two components are not liquid crystalline. By comparison, mixtures containing between 0.1 and 0.5 mole fraction of 4,4′-bipyridyl exhibit mesogenic behaviour; specifically, chiral nematic, b…
High conversion of wastewater into biomass of photosynthetic bacteria was investigated. This biomass is possibly utilized as feed for fish or extraction source of PHA (polyhydroxyalkanoate). As a fundamental investigation, batch experiments were carried out using purple nonsulfur bacteria Rhodobacter sphaeroides to de…
Adenylosuccinate lyase of Bacillus subtilis is inactivated by 25-400 microM 6-(4-bromo-2,3-dioxobutyl)thioadenosine 5'-monophosphate (6-BDB-TAMP) at pH 7.0 and 25 degrees C. The initial inactivation rate constant exhibits nonlinear dependence on the concentration of 6-BDB-TAMP, implying there is reversible formation o…
A series of bis(ether anhydride)s has been synthesized from very bulky bisphenols. Poly(ether imide)s have been synthesized from these bis(ether anhydride)s and two diamines in order to provide a series of poly(ether imide)s with bulky main-chain units. The polymers have been characterized in terms of molecular weight…
Abstract Room temperature (300 K) experiments have earlier established that the replacement of a fluorine atom in p ‐difluorobenzene (pDFB) with a methyl group to make p ‐fluorotoluene (pFT) generates a qualitative difference in intramolecular vibrational redistribution (IVR) characteristics as seen in the S 1 states.…
The Gilbert equation of motion is solved for magnetic nano-elements of arbitrary shape using a hybrid finite element/boundary element method. NiFe elements show small scale domains in the remanent state, if a uniaxial anisotropy parallel to the short axis is assumed. In bars with one pointed end, the formation of the…
Solid-state 125Te NMR studies of inorganic compounds containing tellurium in oxidations states ranging from –II to VI have been made. The chemical shift tensors of Te(OH)6, TeCl4, TeO2 and elemental tellurium have been determined by simulation of magic angle spinning (MAS) NMR spectra. Binary transition-metal ditellur…
The measurements of time dependencies of dielectrics and structural properties of Na0,5Bi0,5TiO3 have been performed. The results of this investigations confirm the prior data, that phase transition in Na0,5Bi0,5TiO3 from tetragonal to rhombohedral phase takes place in wide temperature range, in which both phases coex…
Abstract The specific surface areas of nine argentinian soils obtained by adsorption followed the order N 2 < ethylene glycol < H 2 O, attributed to the presence of smectites (verified by XRD analysis) and some organic coating. The H 2 O 2 treatment of these soils modified the former order of surface area determ…
In this paper we describe a new instrument for real-time measurements of space charge distributions in insulators submitted to rapidly varying voltages. It is illustrated with the pressure wave propagation method but can also be adapted for use with the pulsed electro-acoustic method. A new acoustic generator has been…
A variety of disubstituted diphenylacetylenes and related compounds have been synthesized by a modified Horner–Emmons reaction, and their second harmonic generation (SHG) has been evaluated by the Kurtz powder method. The diphenylacetylenes with weak electron-donating and -withdrawing groups are found to be efficient…