Materials Literature
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We have investigated the effect of low-molecular mass species on the space charge behavior such as space charge distribution and electrical conduction of LDPE (low density polyethylene). We also attempted to explain the relationship between the space charge distribution and electrical conduction. The heterocharge, con…
The effects of solvents on the surface properties of oxygen plasma-treated polyethylene and polypropylene films have been studied by ESCA, contact angle measurement, and adhesion testing. The results show that oxygen plasma treatment produces some low molecular weight materials (LMWM) on the treated surfaces, which ca…
A poly(amic acid) (PAA) was prepared by ring-opening polyaddition of 4, 4′-hexafluoroisopropyridenebis(phthalic anhydride) and 1, 3-bis(4-aminophenoxy)benzene. The PAA film was very soluble to a tetramethylammonium hydroxide (TMAH) aqueous solution, whereas the dissolution inhibitor, 2, 3, 4-tris(1-oxo-2-diazonaphthoq…
Capillary bonding of wet solids through a water film is common and important for a variety of problems. An existing experimental technique for the measurement of capillary bonding forces was improved and used to show how fractional wetted area and capillary bonding force vary with water 'tension' for glass, polyethyle…
Some cetyltrialkylammonium tribromide salts have been studied in the solid phase using Raman spectroscopy and energy dispersive X-ray diffraction. The first technique detected the presence of asymmetric tribromides while the latter technique revealed the degree of asymmetry of the tribromide units (difference in the b…
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…