Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
The performance of a composite film of polypyrrole (PPy) and poly(4‐styrenesulfonate) (PSS) was studied in combination with an organic electrolyte as a possible lithium battery cathode. The composite film had a fairly flat morphology and exhibited electroactivity in organic electrolyte solutions using dimethylsulfoxid…
A Monte Carlo simulation of the NO-CO catalytic reaction on a square lattice is presented. It is shown that a steady reactive state for this reaction exists when the adsorbed N atom is allowed to diffuse on the surface. The window width of this reactive state diminishes as the diffusion rate decreases. The power law b…
A modification of the Bodner–Partom elastic-viscoplastic constitutive model is proposed to account for strain rate dependence of the evolution of hardening. The suggested procedure is for the rate of hardening in the hardening evolution equation to be a direct function of total strain rate. Material constants are dete…
BACKGROUND: The early fate of in vitro-endothelialized prosthetic vascular grafts was assessed in the nonhuman primate. METHODS: Each of 17 male chacma baboons received a control and a confluently endothelialized 4 mm polytetrafluoroethylene graft in femoro-femoral positions (8.2 +/- 0.8 cm). All experimental grafts w…
Various ceramic specimen geometry and insert configurations being used for dynamic compression testing in a split Hopkinson pressure bar are analyzed numerically using DYNA2D. The objective of the analysis is to study the magnitude and locations of stress concentrations in the specimen, the degree to which the hard ce…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation J. R. Gillmor, R. H. Colby, E. Hall, C. K. Ober; Viscoelastic properties of a model main‐chain li…
The structure of the copper protein plastocyanin from poplar leaves (Populus nigra var. italica) at 173 K has been subjected to two independent refinements, using a single set of synchrotron X-ray data at 1.6 A resolution. Energy-restrained refinement using the program EREF resulted in lower root-mean-square deviation…