Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalyst Influence on the Molar Mass Distribution of Hydrolyzed (3-Glycidoxypropyl)trimethoxysilane and (3-Methacryloxypropyl)trimethoxysilaneKarin Piana and Ulrich SchubertCite this: Chem. Mater. 1994, 6, 9, 1504–1508Publication Date (Print):September 1, 1994Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and Spectroelectrochemical Investigations of [(TpTP)MvL2]+Cl- Where TpTP Is the Dianion of Tetra-p-tolylporphyrin, M = P or Sb, and L = Cl- or OCH3-Y. H. Liu, M.-F. Benassy, Stephen Chojnacki, Francis D'Souza, Tanya Barbour, Warwick J. Belcher, Penelope J. Br…
Abstract X-Ray analyses revealed that bis(hexafluoroacetylacetonato)manganese(II) forms with 1-[3- and 4-(N-tert-butyl-N-oxyaminophenyl)]imidazoles cyclic dimer complexes in cis coordination. The long-range magnetic couplings between the two spin 4/2’s resulting from the strongly antiferromagnetic short-range interact…
This paper deals with magnetostatic element formulations for modelling narrow gaps in an iron core, as well as thin iron shells. These special elements have been developed for gaps in transformers or motors. Nodal elements are used with magnetic scalar potentials as state variable. The principle and the formulations o…
Threonine dehydratase is the key enzyme in L-isoleucine synthesis, since it is allosterically feedback-inhibited by L-isoleucine. With the aim of obtaining regulatorily altered mutants of the threonine dehydratase of Corynebacterium glutamicum, amino acids were specifically exchanged and a new biological system of mut…
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…