Materials Literature
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The clinical effects of contrast agents not only result from high osmolality, but also from their own specific pharmacology, which mediates chemotoxic effects. In this review, the chemotoxic effects of the new nonionic agent, iohexol, are compared with those of standard ionic and other low osmolality contrast agents,…
Abstract Recent advances in the area of molecular diffusion in polymer‐solvent systems will be reviewed. Alfrey's classification scheme for the diffusion of solvent molecules in polymers will be used as a starting point. It will be shown that the various regions on Alfrey's diagram are distinguished by the ratio of tw…
High electrical powder conductivity (14 S cm–1 at 300 κ) and unusual temperature dependence were observed for a new tetrathiafulvalene (TTF) compound, [(TTF)2]+Cu+Cl2, which was prepared by oxidation of TTF with copper(II) chloride; the compound was characterized by e.s.r. and i.r. spectra as well as magnetic suscepti…
SAS4A is a new code system which has been designed for analyzing the initial phase of Hypothetical Core Disruptive Accidents (HCDAs) up to gross melting or failure of the subassembly walls. During such postulated accident scenarios as the Loss-of-Flow (LOF) and Transient-Overpower (TOP) events, the relocation of the f…
La sidwillite MoO3.2H2O a été rencontrée sur des échantillons de quartz filonien de Lake Como, Colorado, U.S.A. ; elle y est associée à de la pyrite assez rare et de la jordisite dont elle dérive par oxydation. Les cristaux sont monocliniques P21/n avec a = 10,618(5), b = 13,825(7), c = 10,482(5) Å, β = 91,61(4)°, V =…
A novel and simple method is described for evaluation of molecular weight – viscosity relationships for a polymer where only broad molecular weight distribution samples are available. The method demands measurement of the intrinsic viscosity and GPC chromatograms of several samples. Results of applying the procedure t…
A comparison has been made from the practical point of view between the two computer-search-match programs of Johnson/Vand (G. G. Johnson, and V. Vand. Ind. Eng. Chem. 59, 19. (1967)) and SANDMAN (W. N. Schreiner. C. Surdukowski & R. Jenkins. J. Appl. Cryst. 15, 513 (1982) ), both of which have been routinely used in…
Abstract A new stereospecific intramolecular hydride transfer, induced by an alkoxide, has been demonstrated under NCI/OH − conditions using unimolecular and collision‐induced decomposition spectra.
The Al–C bond of Al(TPP)(Et)(TPP = tetraphenylporphyrinato) is homolytically cleaved upon visible light photolysis in benzene in the presence of an excess of 2,4,6-tri-t-butylnitrosobenzene, yielding spin adducts of Al(TPP) and ethyl radicals with a quantum yield of the order of 10–3.
Laudatio.- On polymer solution thermodynamics.- Interaction between block copolymer micelles in solution.- Temperature - concentration dependence of polyvinyl acetate gels with respect to the collapse phenomenon.- Polymorphic phase transition and monomolecular spreading of synthetic phospholipids.- Adsorption-entangle…
Abstract
The suitability of 6%V Permalloy as magnetic head core materials for use in the digital tape-recording unit of an electronic computer has been investigated with respect to important requirements for the core materials such as effective permeability in a high frequency field, stress-sensitivity in magnetic permeability…
An analysis of grain boundary sliding is made based on the hypothesis that the rate-limiting process involves, overall, the climb-limited movement along grain boundaries of lattice dislocations, which originate in the grain interiors. Reasonable values are calculated for the contribution of grain boundary sliding to t…
Optimisation of the reactor design for the preparation of ZnSe by metal-organic chemical vapour deposition (MOCVD) at atmospheric pressure has been achieved using TiO2‘smoke’ experiments.Formal expressions derived from gas flow dynamics adequately describe the experimental situation in the laminar flow regime and the…
The purpose of this work is to study the relationship of energetic and physical properties of polymetric materials with ice adhesion, and to develop the material to prevent ice adhesion. From various parameters of water and ice, dispersion and hydrogen bond contribution of surface free energy of ice were calculated. U…
The effect of strain rate and temperature on the dynamic fracture toughness KId and the
Permeation response of hydrogen and deuterium through α-iron under the condition of pressure modulation was measured to determine the diffusion coefficient which contained no surface effects. The diffusion coefficients of hydrogen isotopes are obtained between 500 and 1000 K.Permeation under hydrogen ion bombardment w…
The variation of contact angle of liquid sessile drops on solids has been attributed to roughness (Wenzel2), the static charge effect (Holly,3 Ponter and Yekta-Fard3) and contamination at the solid surface or in the liquid and gaseous phases.
The interaggregate exchange reaction of Cu5Mes5(Mes = C6H2Me3-2,4,6) with Cu4(OBz)4(OBz = O2CPh) in benzene or toluene afforded the trinuclear cluster Cu3Mes(Obz)2(40% yield) with two bridging benzoato groups [Cu–O 1.862 Å(mean); bridged Cu ⋯ Cu 2.888(2)Å]and one bridging, three-centre, two-electron bonded mesityl gro…
Thermoluminescence properties of bismuth germanate and their relationship to radiation damage characteristics have been investigated. Thermoluminescence and radiation damage in bismuth germanate display several similar properties including similar responses as a function of radiation dose, similar saturation levels, a…