Materials Literature
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The equilibrium structure of a monolayer formed by long polyelectrolyte chains grafted at one end onto an impermeable planar surface is analyzed. In contrast to the case of uncharged grafted polymer layer the unit density profile in a swollen state is not of the parabolic, but o the exponential type. The decrease in t…
Direct correlations are made between the extent of chromium depletion at grain boundaries and intergranular stress corrosion cracking (IGSCC) of 304 stainless steel during slow-strain-rate (SSR) tensile tests in 288 °C air-saturated water. IGSCC was found to depend on the minimum chromium concentration, the spacing of…
Current models of nutrient utilization by planktonic algae generally assume that cells transport nutrients continuously. This assumption is violated in the case of Si utilization by diatoms. Silicic acid transport is confined to specific portions of the cell cycle such that only a fraction of the cells in a population…
Description Describes current research on the effects of radiation on structural materials. The section on Ceramics and Nuclear Fuels has five papers that reflect this interest. Other topics include: • Irradiation facilities • Current commercial power reactor systems • Micro structural characterization of irradiation…
Spirobenzopyran derivatives carrying a monoazacrown moiety, such as 12-crown-4, 15-crown-5, and 18-crown-6 moieties, and their acyclic analogue, at the 8-position have been synthesized. Alkali metal ion complexation by the crowned spirobenzopyrans, followed by isomerization to the corresponding merocyanine form, and t…
Physiological stress was quantified in specimens of the European flat oyster Ostrea edulis, acclimated to a matrix of temperature (5–25°C) and salinity (16–34%o) conditions, using the Scope for Growth (SFG) index. Variations in the index were interpreted from the responses of its components, absorption efficiency, fil…
The structural and electronic properties of cubic and tetragonal zirconia (${\mathrm{ZrO}}_{2}$) are studied using a periodic ab initio Hartree-Fock method. Only valence electrons are treated explicitly, while effective core potentials are used for describing core electrons. The equilibrium geometries and elastic prop…
Al2O3/SiC nanocomposites exhibited the high fracture toughness and strength at room temperature and good high-temperature mechanical properties. These significant improvements of mechanical properties were contributed to the dispersion of nanometer-size SiC particle within Al2O3 matrix grains. In this paper, the sinte…
A versatile approach to dendritic macromolecules with aromatic polyester inner structure and a readily modified hydrophobic/hydrophilic ‘surface’ is described. The polyester fragments are prepared by a convergent growth process involving 3,5-bis(benzyloxy)benzoic acid as the ‘surface’ or chain-ending moiety and trichl…
From a newly synthesised tridentate ligand [pepci =N′-(2-pyridin-2-ylethyl)pyridine-2-carbaldimine] two new octahedrally co-ordinated nickel(II) dimers, [{Ni(pepci)(N3)2}2]1 and [{Ni(pepci)(NCS)2}2]2, have been prepared. The crystal structure 1 has been solved. It crystallizes in space group P21/c with four formula we…
The chemical, mechanical, and optical properties of the first two members of a new family of fluoroplastic materials are examined. These new materials have the unique properties of being optically transparent in the visible and near IR and also chemically inert. Comparison of the optical properties to other transparen…
The book, which is based on a short course held by the Thermal Analysis Consultancy Service of the University of Leeds, aims to provide an overview of the principal thermal methods and their application in major areas of importance. The instrumental topics covered include: differential thermal analysis (DTA), differen…
A complete model for transformers is derived on the basis of very efficiently calculated elementary (turn-to-turn) parameters. A high-order turn-to-turn model is constructed for the windings. This model is reduced to a lower order by operating on the resulting matrices. An electric equivalent circuit for the core is o…
The occurrence of longitudinal-transverse splittings in the optic-vibrational-mode frequencies of partially ionic glasses has previously been observed in several glass systems and was also theoretically confirmed. The transverse-optic (TO) and longitudinal-optic (LO) components are usually derived from near-normal inf…
The effect of B2O3 on the viscosity of a haplogranitic liquid (KrO-Na,O-AlrOr-SiO,) hasbeen determined at I atm pressure in the temperature interval of 600-1600 °C. Viscositymeasurementso f a haplogranite, haplogranite + 4.35 wt% B2O3 and haplogranite + 8.92 wt% B2O3 have been performed using the concentric cylinder a…
In previous work it has been shown how to calculate the magnetization curve from a simple theory which invokes a constant energy loss per unit change in magnetization in a ferromagnet. The energy loss, which is therefore proportional to the change in magnetization, leads to hysteresis loops which are obtained from fir…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLamellar structure and morphology of nylon 46 crystals: a new chain folding mechanism for nylonsE. D. T. Atkins, M. Hill, S. K. Hong, A. Keller, and S. OrganCite this: Macromolecules 1992, 25, 2, 917–924Publication Date (Print):January 1, 1992Publication History Published on…
The hydration numbers of various dysprosium(III) polyaminocarboxylates have been determined from the DyIII-induced 17O NMR water shifts. The results are in good agreement with those obtained by other techniques. The data indicate that formation of polynuclear species occurs in the iminodiacetate and nitrilotriacetate…
Article Stability and Instability of an Uniaxial Alignment Against Biaxial Distortions in the Isotropic and Nematic Phases of Liquid Crystals was published on January 1, 1992 in the journal Journal of Non-Equilibrium Thermodynamics (volume 17, issue 2).
A method for determining the phase-retardation function of the uniform-intensity axilens is discussed and compared with that of an earlier publication [Opt. Lett. 16, 523 (1991)]. Within the presented formulation good agreement is achieved between the geometrical-optics prediction and the numerically evaluated diffrac…