Materials Literature
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The improved T-/spl Omega/ method is applied to the computation of the three dimensional eddy current field in a 360 MVA/500 kV large power transformer, the structure of which is complicated. The different cases of tank wall with magnetic shunt, aluminium screen or without any shield are analyzed. The relations betwee…
Accurate X-ray integrated-intensity data collected from an extended-face crystal of GaAs are analysed to provide detailed information on the thermal vibrations of atomic species, including cubic anharmonicity, at room temperature. The values obtained for the thermal parameters are BGa = 0.622 (3) Å2, BAs = 0.483 (5) Å…
Abstract Twenty-seven single-crystal structural refinements were performed on synthetic spinels along the MgAl 2 O 4 – Al 8/3 □ 1/3 O 4 join. The number of vacancies (from 0.09 to 0.22) was determined according to microprobe analysis. Results indicate that vacancies are limited only to octahedral sites, with a vacancy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Theoretical Study of Tacticity Effects on Poly(vinyl chloride)/Poly(methyl methacrylate) MiscibilityJ. D. HoneycuttCite this: Macromolecules 1994, 27, 19, 5377–5381Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissue 1 S…
Throughout the 50–1050 cm−1 range, in addition to the first order Raman peak of optical phonon, a weak structure in the vicinity of 147 cm−1 and two intense peaks (bands) in the vicinities of 632 and 956 cm−1 have been observed. The structure at 147 cm−1 is believed to be mainly due to scattering by the transverse aco…
Soils developed from mica schist in Eastern Nepal (The Himalayas) were investigated. All soil horizons were characterized by high organic carbon and extractable aluminum contents. Chemical and physical analyses indicated andic soil properties. No short-range order minerals could be detected. It is assumed that aluminu…
We report results of off-lattice Monte Carlo simulations on randomly grafted polymer layers in poor solvent. The results of the investigations show that the conformations of polymer chains in these matrices undergo a gradual transition from a mushroom to brush shape with increases in grafting density, in agreement wit…
The normal-incidence reflectance of ion-beam-deposited boron carbide thin films has been evaluated in the extreme ultraviolet (EUV) spectral region. High-reflectance coatings have been produced with reflectances greater than 30% between 67 and 121.6 nm. This high reflectance makes ion-beam-deposited boron carbide an a…
A novel optical method was used for quantitative characterization and continuous measurement of both the adhesion and spreading of mammalian cells on inorganic surfaces. It is based upon the effective refractive index change caused by cells when they adhere to a planar optical waveguide. We have applied this technique…
The thermal conductivity \ensuremath{\lambda} of KOH-doped ice was measured using the transient hot-wire method at temperatures in the range 55--250 K and at pressures up to 0.15 GPa. With an isobaric increase of temperature at 0.08 GPa, \ensuremath{\lambda} decreased 17% at about 74 K. This decrease is associated wit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of phase separation in mixtures of associating polymers and homopolymers in solutionTom Annable and Rammile EttelaieCite this: Macromolecules 1994, 27, 20, 5616–5622Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Publish…
A mean-field model for the ferroelectric ordering of hard sphero-cylinders with dipolar interaction is developed within the Onsager formalism. By performing accurate numerical analyses, a complete phase diagram is obtained in terms of the dipolar strength, the number density, and the pressure of the spherocylinders, w…
The effects of corona discharge treatment on polyethylene and polypropylene homopolymers have been studied. X-ray photoelectron spectroscopy was used to determine surface compositions which were related to surface free energy estimates from contact angle measurements. Changes in composition and surface free energy wer…
Negative electrodes for use in nickel‐hydride batteries were prepared from MmNi 3.6 Mn 0.4 Al 0.3 Co 0.7 ( Mm = misch metal with the composition of 24.87 % La , 52.56 % Ce , 5.57 % Pr , 16.86 % Nd , and 0.14 % Sm ) alloy being mixed with RuO 2 or Co 3 O 4 powder. Then the hydrogen evolution reactions at the electrodes…
Multilayer semiconducting (Ba, Ca)TiO 3 ceramics having positive temperature coefficient of resistivity (PTCR) were fired in reducing-reoxidizing atmospheres using Ni–Pd alloys as internal electrodes. Nickel was added to palladium electrodes to form the ohmic contact between internal electrodes and ceramics. Samples w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModels for Intramolecular Exchange in Organic .pi.-Conjugated Open-Shell Systems: 3-Nitrenophenyl and 4-Nitrenophenyl Units Connected by 2,5-Furandiyl, 2,5-Thiophenediyl, and 2,5-Pyrrolediyl Nonalternant Exchange LinkersChris Ling and Paul M. LahtiCite this: J. Am. Chem. Soc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Frontier Orbital Density Functional Approach to Polarizability, Hardness, Electronegativity, and Covalent Radius of Atomic SystemsTapan K. Ghanty and Swapan K. GhoshCite this: J. Am. Chem. Soc. 1994, 116, 19, 8801–8802Publication Date (Print):September 1, 1994Publication H…
The reaction of sputter deposited layers of Ti on the (001) surface of a synthetically grown single crystal type IIb boron doped diamond has been investigated using Auger electron spectroscopy with depth profiling, Rutherford backscattering spectroscopy (RBS) and Raman spectroscopy. Electrical characteristics of the c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAtom-Based Modeling of Elastic Constants in Amorphous PolystyreneTuija Raaska, Satu Niemela, and Franciska SundholmCite this: Macromolecules 1994, 27, 20, 5751–5757Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissue 1 Sep…
The effect of molybdenum (Mo) content on the sulfide stress cracking (SSC) resistance of low-carbon (C), low-alloy steels in hydrogen sulfide (H2S)-saturated sodium chloride (NaCl) solution was investigated by conducting a constant-load test on four steels containing 0% to 0.45% Mo. The microstructures consisted of se…