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Abstract This paper reviews some important aspects of the analysis of solid‐solid reactions which include: fundamental considerations, experimental techniques, analysis of pellet‐pellet reactions, analysis of mixed powder reactions, role of the gas phase, and reactor design. Illustrations are given wherever necessary.…
The densities of binary aluminosilicate melts were measured X‐radiographically as a function of Al 2 O 3 , concentration between 1800° and 2000°C. Within this temperature range, the density curves vary linearly and are parallel from fused SiO 2 to ≊30 to 45 mol% Al 2 O 3 , depending on the temperature. At higher Al 2…
A differential equation was derived for ionic migration in a system with two mobile ions. Stationary solutions were obtained for the case where the slower ion follows the faster, which reduce to those obtained when diffusion is ignored. When the faster ion is “behind” the slower no stationary solutions are possible, b…
The syntheses of [(CS(CH3}S}2Mn]PF6' (CS(CH3}S}2Mn, and Na [(C S (CH 3 ) S'2Mn] c are described.Magnetic susceptibility, infrared, electrochemical, NMR, and reactivity studies suggest the formulation of these complexes as low spin 16-, 17-, and 18electron planar metallocences.EPR spectra of the neutral complex are con…
The chemical and physical properties of C 3 S pastes cured at 4°, 25°, and 65°C were investigated. The 65°C paste had lower H 2 O surface area and larger capillary pore volume than the 25°C paste. The structure of the gel in the 4°C paste changes markedly with increased hydration. These changes were reflected in an in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(α-methylene-γ-butyrolactone) Synthesis, Configurational Structure, and PropertiesMurali K. AkkapeddiCite this: Macromolecules 1979, 12, 4, 546–551Publication Date (Print):July 1, 1979Publication History Published online1 May 2002Published inissue 1 July 1979https://pubs…
The enthalpies of transformation of pure, well‐characterized samples of brookite and anatase to rutile were determined by solution calorimetry in a 3Na 2 O·4MoO 3 melt at 971 ±2 K. The experiments gave the following results: brookite→rutile, ΔH° 971 = ‐0.17±0.09 kcal mol −1 ; anatase → rutile, ΔH° 971 = ‐0.78±0.20 kca…
The kinetics of oxidation of Zircaloy‐4 in steam were examined under isothermal conditions from 900° to 1500°C. Rate curves describing the growth of the reaction product layers, oxide‐ and oxygen‐stabilized alpha, were obtained at 50°C intervals under carefully defined and documented experimental conditions. The early…
Abstract During the past several years the fundamental knowledge of the processes which lead to rubber-brass bond formation and to bond degradation has increased considerably. As a result of the application of new instrumental techniques to the study of the rubber-brass interface it has been established that the brass…
A previous paper demonstrated that the orientational disorder present in all smectic A phases causes most molecules to make fairly large angles with the normal to the smectic plane. Thus, the molecular directions form a diffuse cone around the layer normal. It is now argued that even the preferred directions of the mo…
Abstract A variable‐range hopping model is examined for transport in a band tail. For an exponential density of states the difference of the activation energies of conductivity and thermoelectric power, Δ E , is essentially determined by the steepness of the tail. Δ E varies slowly with tempera ture and depends little…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of supported nickel catalysts by x-ray photoelectron and ion scattering spectroscopiesMilton. Wu and David M. HerculesCite this: J. Phys. Chem. 1979, 83, 15, 2003–2008Publication Date (Print):July 1, 1979Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstituent effects in the electroreduction of porphyrins and metalloporphyrinsA. Giraudeau, H. J. Callot, Joseph Jordan, I. Ezhar, and Maurice GrossCite this: J. Am. Chem. Soc. 1979, 101, 14, 3857–3862Publication Date (Print):July 1, 1979Publication History Published online…
A Brownian dynamics model for the backbone chain of a macromolecule is developed as a system of linked rigid bodies so that constraints on valence angles and bond lengths are satisfied exactly. For comparison, a corresponding flexible model is developed in which bond lengths and valence angles are held nearly constant…
Zinc oxide films were produced by spray pyrolysis starting with aqueous solutions of ZnCl2, ZnCl2 plus H2O2, and Zn acetate, and structural, optical, electrical, and thermoelectrical properties of the deposited films were investigated. Highly transparent films with resistivity as low as 10−3 Ω cm can be produced by su…
The aim of this paper is to present the state of the art of the research on the physics of long sparks. The reference configuration is a non uniform long gap subjected to positive impulse voltages, which is the laboratory schematization of the most critical conditions occurring in the design of EHV apparatus. Under th…
Abstract A multiordering parameter model for glass‐transition phenomena has been developed on the basis of nonequilibrium thermodynamics. In this treatment the state of the glass is determined by the values of N ordering parameters in addition to T and P ; the departure from equilibrium is partitioned among the variou…
Abstract Using as bases the amount of clothing needed to achieve thermal comfort and the reduction in the skin's resistance needed to obtain thermal equilibrium, the relative sultriness of warm-humid and hot-arid summer climates is assessed. Conditions of equal sultriness are referred to a vapor pressure of 1.6 kPa in…
Abstract Die aus Tl(OCOCH 3 ) 3 ‐ n (N 3 ) n und einfachen, flexiblen Olefinen 1a‐1c erhaltenen 1‐Aziridinyl‐azothallium‐Verbindungen 2a‐2c liefern mit Säurehalogeniden oder Hexafluoressigsäureanhydrid in Lösung die entsprechenden trans ‐1‐Azido‐2‐halogencyclohexane 3f und 3g sowie trans ‐2‐Azidocyclohexyl‐trifluorace…
Enriched Fe 2 MoO 4 spinel was studied by Mossbauer spectroscopy in the temperature interval of 77-732K. The electrical conductivity measurements were carried out in the temperature range 298-475K. From these studies, it was concluded that fast electron exchange takes place amongst Fe 3+ and Fe 2+ ions situated at A a…