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Vesuvianite can contain significant amounts of boron (up to-4 wtTo B2O). The crystal stnrctures of five boron-bearing vesuvianite crystals have been refined using MoKo X-ray data. Although the crystals are significantly biaxiat (2y < 20o), very careful examination of the diffraction data shows no deviation from…
In this Brief Report we use a self-consistent mean-field (SCF) method to predict the surface excess (${\mathit{z}}^{\mathrm{*}}$) and surface volume fraction (${\mathrm{\ensuremath{\varphi}}}_{1}$) of the surface active component in a binary polymer blend. The SCF results are in excellent agreement with the measured $…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of the Complex Metal Hydride BaReH9N. T. Stetson, K. Yvon, and P. FischerCite this: Inorg. Chem. 1994, 33, 20, 4598–4599Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissue 1 September 1994https://pubs.acs.org/do…
We report results on the response of a family of displacement sensors, which are based on the magnetostrictive delay line (MDL) technique, using current conductors orthogonal to the MDL. Such sensing technique is based on the change of the magnetic circuit at the acoustic stress point of origin due to the displacement…
The first part of this paper discusses the molecular design of selected examples of structural units containing taper shaped exo-receptors and various crown ether, oligooxyethylenic, and H-bonding based endo-receptors, which self-assemble into cylindrical channel-like architectures via principles resembling those of t…
Nanosize oxides and mixed oxides were produced in a rectangular counterflow diffusion flame burner. Their formation and growth mechanisms in the burner are reviewed. This paper correlates flame temperature, residence time and precursor concentration to the particle size, morphology and crystalline structure of these n…
The room-temperature photoluminescence spectrum of SiO2 glass: 0.1% Cr prepared by sol–gel method is reported. It consists of a broad band centered at 14 900 cm−1 with a width of 4200 cm−1 and a lifetime in the μs order and is attributed to the d–d transition of Cr5+ ions (3d1 electron configuration). Absorption and e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Properties of Stereoregular Polyamides Derived from L-Tartaric Acid: Poly[(2S,3S)-2,3-Dimethoxybutylene alkanamide]sJ. J. Bou, I. Iribarren, and S. Munoz-GuerraCite this: Macromolecules 1994, 27, 19, 5263–5270Publication Date (Print):September 1, 1994Publicatio…
A polyphase titanate ceramic incorporating sodium‐free simulated high‐level nuclear waste was doped with 0.91 wt% of 244 Cm to accelerate the effects of long‐term self‐irradiation arising from α decays. The ceramic included three main constituent minerals: hollandite, perovskite, and zirconolite, with some minor phase…
A quantitative theoretical model that describes the amount of evanescent field that is absorbed by an infinite cladding has been developed. The validity of this model has been confirmed by a series of experiments to determine the typical dependence of the abosrption on each parameter (fiber length, fiber diameter, lig…
Abstract Vaterite, a CaCO 3 polymorph, is a rare mineral that is said to be metastable under all known conditions. According to the literature, vaterite precipitated from carbonate solution recrystallizes spontaneously to calcite or aragonite. Yet vaterite has been identified in hard tissues of organisms, in gallstone…
Four well‐defined monodisperse oligo( p ‐phenylenevinylene)s (see Figure, n = 3 to 6) have been used in solid‐state voltammetric investigations as model compounds for the related polymer. The redox behavior in solution and in the solid state is compared and an interpretation of the controversial “current plateau” prop…
Abstract 1 H NMR and 13 C NMR have been used to study the end groups and tacticity in PMMA macromonomers and oligomers. These macromonomers are terminated almost exclusively in one vinylidene group per chain. The end group signals from the macromonomers are identified in both the 13 C and 1 H NMR spectra. The spectra…
In this paper we introduce a method to study surface torsional anchoring of both chiral-molecule-doped and pure nematic liquid crystal (NLC) without using any extra field. By measuring the transmission of the twisted or supertwisted NLC cells, the actual twist angles in NLC cells are obtained, which differ from the an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLack of Superaromaticity in Carbon NanotubesJ. AiharaCite this: J. Phys. Chem. 1994, 98, 39, 9773–9776Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissue 1 September 1994https://pubs.acs.org/doi/10.1021/j100090a009https:/…
The in situ β‐Si 3 N 4 /α′‐SiAlON composite was studied along the Si 3 N 4 –Y 2 O 3 : 9 AlN composition line. This two phase composite was fully densified at 1780°C by hot pressing Densification curves and phase developments of the β‐Si 3 N 4 /α′‐SiAlON composite were found to vary with composition. Because of the coo…
Chemical modification studies of spinach leaf ADP-glucose pyrophosphorylase with pyridoxal-P have shown that a highly conserved lysyl residue near the C terminus might be involved in the binding of 3-P-glycerate, the allosteric activator. Site-directed mutagenesis of the corresponding residue (Lys419) of the Anabaena…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation of Carbon Monoxide and Carbon Dioxide at Cesium-Promoted Cu(110) and Cu(110)-O SurfacesA. F. Carley, M. W. Roberts, and A. J. StruttCite this: J. Phys. Chem. 1994, 98, 37, 9175–9181Publication Date (Print):September 1, 1994Publication History Published online1 May…
The crystal field (CF) package applicable to orthorhombic or higher symmetry has been extended to enable calculations of energy levels and ligand field states for 3dN ions in crystals at arbitrary symmetry sites by taking into account the contributions of the ‘‘imaginary’’ CF terms. The full Hamiltonian matrix, includ…
Plates of SiC, TiB2 and Al2O3 were impacted edge-on with steel projectiles at striking velocities between 20 m/s and 1000 m/s. Fracture propagation in the specimen was visualised by means of a Cranz-Schardin camera within the first twenty microseconds. The phenomenology of damage is discussed and compared for the diff…