Materials Literature
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The experimental observations of temperature oscillations in liquids and gases undergoing free convection are reviewed. The theoretical methods used to study problems of this type are indicated, and the extent to which current theory can account for the observations is discussed. Evidence for the occurrence of convect…
Abstract A procedure is described for the analysis by computer of the output from a differential scanning calorimeter. Enthalpy calibration with a variety of materials confirms that alumina is excellent for this purpose. Both the crystallinity, x T , and the heat of fusion of polyethylene, ΔH T , vary with temperature…
Corrosion inhibitors find application in a great variety of industrial processes, such as pickling operations, petroleum processing, the chemical industry in general and many more. One prominent class of inhibitors is organic amines, predominantly used in acid environments. Their action has been exhaustively investiga…
The relationship between conductivity and sodium content has been investigated for sintered beta‐alumina containing MgO . Conductivities of 3.5 × 10 − 3 , 8.0 × 10 − 3 , and 4.4 × 10 − 3 ohm − 1 ‐ cm − 1 were found for material containing 1, 2, and 4% MgO , respectively, with optimum sodium content. Experimental condu…
Factors which affect the texture and microstructure of Zr-2.5 wt % Nb extruded tubes have been investigated. The major factor that determines th~ texture is the way the metal flows, which is controlled by the die shape, the extrusion ratio and the lubricant. The microstructure is controlled by the temperature during e…
Abstract Aerial oxidation of titanous solutions has been carried out at temperatures between 60° and 95°C. A desired one of titanic oxides of anatase, brookite and rutile types, can be obtained from strongly acidic solutions by selection of the kind and concentration of anions present and temperature.
By a rotating disk method which had quantitatively been treated in fluid motion, silicon epitaxial deposition using the SiCl 4 ‐ H 2 system was effected at various susceptor rotation speeds and various pressures. Calculation of the growth rate was initially made with a one‐dimensional model of an infinite diameter dis…
Abstract Some physical properties of linear polydimethylsiloxanes have been studied. The states and transitions in polydimethylsiloxanes have been investigated by using the method of dynamic heat capacity and a thermomechanic method in the temperature range from −150 to +200°C. The temperature dependence of primary an…
A study was made of the effect of surface preparation and pretreatment on the oxidation of zone‐refined nickel from 500° to 700°C. “Clean,” hydrogen‐reduced surfaces, maintained essentially free of impurities such as S, Si, Fe, and C, oxidized at a faster rate than air‐exposed electropolished or etched annealed nickel…
The total conductivities of a series of ThO 2 ‐ base electrolytes have been determined over a wide range of oxygen activity in atmospheres of H 2 / H 2 O / Ar mixtures. At 1200° and 1400°C and low oxygen activities, a significant conductivity contribution corresponding to hydrogen ion (proton) conduction was found for…
Abstract Vorliegende Arbeit gibt einen zusammenfassenden Bericht zur Kinetik der Keimbildung, wobei besonders der nichtstationäre Verlauf dieses Prozesses untersucht wird. Auf Grund einer eingehenden Diskussion des Keimbildungsmechanismus wird. der Einfluß aktiver Unterlagen, wie auch die Art der Ausgangs‐ und der sic…
The n‐type conductivity in commercially available stabilized zirconia electrolyte tubes was studied from 600° to 1400°C using three independent techniques: emf measurements on H 2 ‐ H 2 O mixtures, coulometric titration of oxygen out of liquid silver or copper, and electrolyte breakdown in gas mixtures with low oxygen…
Abstract Recent experience with a variety of materials in biomedical applications has demonstrated the importance of material form and shape in determining tissue response to implants. An investigation was made of the effect of pore size on the response of loose connective tissue to porous methacrylate implants. With…
Abstract Die Struktur der Verbindung (Ba 2 )( 12 ) (Ni II Te VI )( 6 )O 6 wurde mit Hilfe von Einkristall‐Röntgen‐Beugungsdaten ermittelt und bis zu einem R‐Wert von 2,9% verfeinert. Ba 2 NiTeO 6 kristallisiert rhomboedrisch (Raumgruppe R 3 m) mit a = 5,797 und c = 28,595 Å für die trigonal aufgestellte Elementarzelle…
Low-temperature hydrothermal reactions of metakaolinite have been investigated, with and without additions of silica, by use of the bases LiOH, NaOH, RbOH, and CsOH and also the mixtures NaOH + LiOH, NaOH + KOH, KOH + LiOH, and NaOH + Me4NOH. Over certain temperature and composition ranges reproducible crystallisation…
The deformation and fracture of Zircaloy-4 and pure zirconium sheets having strong (0002) textures were studied under plane-strain compression at temperatures from 20° to 800°C. Zircaloy-4 underwent a ductility transition from limited strain (0.1 to 0.3) to extensive fracture-free flow (> 0.6) at about 300°C; pure zir…
Progress of Theoretical Physics Vol. 50 No. 2 (1973) pp. 529–544On the Extension of the Resonating Group Treatment of Composite Particle Scattering to the Heavy System Hisashi Horiuchi Progress of Theoretical Physics Vol. 50 No. 5 (1973) pp. 1561–1578On the Inner Repulsive Effect Due to the Pauli Principle between Nuc…
(1972). Foam Separation Methods. Separation and Purification Methods: Vol. 1, No. 1, pp. 117-198.
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 F. M. d'Heurle, N. G. Ainslie, A. Gangulee, M. C. Shine; Activation Energy for Electromigration F…
A quantitative optical microscopy study was made on the grain size distribution in one-, two- and three-dimensions in recrystallized titanium (0.2% Oeq) by the linear intercept, planimetric and serial sectioning methods. Analysis of the results revealed that all the size distributions were logarithmic-normal and that…