Materials Literature
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An attempt has been made to establish a mechanism for stress corrosion by direct observation on the propagation of cracks in α-brass tested under ammonia. The observations indicate that failure might be described by a two-stage process, of local embrittlement, followed by a cleavage-like fracture. Such a model demands…
Data on the diffusion of Ar in sanidine, microcline, phlogopite, glauconite, and leucite are presented. We conclude from these data that: 1) Dynamic lattice changes markedly influence Ar loss at the time of the changes. 2) If Ar diffusion takes place under conditions of no lattice changes, all Ar will be lost at a sin…
Detailed results are presented on the absorption and desorption of water vapour (0—100% r.h., 30°—90°C) by cellulose triacetate, secondary cellulose acetate, ethyl cellulose, drawn nylon 6.6 yarn, Terylene, Orlon, wool and Fibrolane. The sorption characteristics of the samples were stabilized prior to the sorption mea…
The initiation of localized cracking in hydrogenated highstrength steel was dependent on the development of a critical hydrogen concentration and relatively insensitive to the magnitade of the applied stress. The stress was believed to influence the delayed failure process by providing the means for grouping the hydro…
The thermomagnetic properties of a compound Mn 2 As were investigated together with the phase diagram of Mn–As system. From the results of measurements of the temperature dependence of magnetic susceptibility and specific heat of the compound Mn 2 As, it was found that this alloy is antiferromagnetic with the Néel poi…
As connective tissue ages, the following changes have been observed: (1) a reduction in its swelling properties as noted by Banfield (1) and Elden (2); (2) an alteration in the contraction and relaxation of collagen described by Banga et al. (3) as well as by Verzar (4) ; (3) an increase in the size of collagen fibers…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSOME SOLIDUS TEMPERATURES IN SEVERAL METAL—CARBON SYSTEMSM. R. Nadler and Charles P. KempterCite this: J. Phys. Chem. 1960, 64, 10, 1468–1471Publication Date (Print):October 1, 1960Publication History Published online1 May 2002Published inissue 1 October 1960https://pubs.acs…
Abstract This paper reviews the behavior of aluminum in contact with natural waters. The influence of water composition and service factors on corrosivity to aluminum are discussed. Laboratory pitting test methods are described and data are presented to support the existence of a cube root (in time) rate curve for the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Spectral and Chemical Properties of α-Silyl KetonesA. G. Brook, M. A. Quigley, G. J. D. Peddle, N. V. Schwartz, and C. M. WarnerCite this: J. Am. Chem. Soc. 1960, 82, 19, 5102–5106Publication Date (Print):October 1, 1960Publication History Published online1 May 2002Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic and Spectral Properties of the Spin-Free 3d6 Systems Iron(II) and Cobalt(III) in Cobalt(III) Hexafluoride Ion: Probable Observation of Dynamic Jahn-Teller EffectsF. A. Cotton and M. D. MeyersCite this: J. Am. Chem. Soc. 1960, 82, 19, 5023–5026Publication Date (Print…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Configurational Changes of Poly-L-proline in SolutionIzchak Z. Steinberg, William F. Harrington, Arieh Berger, Michael Sela, and Ephraim KatchalskiCite this: J. Am. Chem. Soc. 1960, 82, 20, 5263–5279Publication Date (Print):October 1, 1960Publication History Published on…
When a textile yarn is impacted transversely, strain waves and transverse waves which " travel outwards away from the point of impact are initiated. Each strain-wave front travels at constant velocity. A transverse-wave front, however, changes its velocity each time it meets a reflected strain-wave front. This effect…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTULTRAVIOLET SPECTRA AND STRUCTURES OF 2,2'-BIPYRIDINE AND 2,2',2″-TERPYRIDINE IN AQUEOUS SOLUTION1Kazuo NakamotoCite this: J. Phys. Chem. 1960, 64, 10, 1420–1425Publication Date (Print):October 1, 1960Publication History Published online1 May 2002Published inissue 1 October…
Following Ritchie, the anomalous characteristic energy losses of energy lower than the plasmon energy, exhibited by some metals, are attributed to quantized surface waves of the degenerate electron gas. Although Ritchie's theory has been verified for an ideal pure metal surface by Powell and Swan by reflection of high…
The phenomenon of ferroelectricity in pseudo-cubic crystals is discussed in terms of the normal modes of vibration. It is shown that the parameters which determine the lattice vibrations of a diatomic ionic crystal may be chosen in such a way that the crystal will exhibit ferroelectric properties, and that ferroelectr…
Abstract Dislocations in a variety of single-crystal flakes of graphite (hexagonal crystal structure) have been studied by transmission electron microscopy. All the dislocations observed are parallel to the layer plane with Burgers vectors in this plane. Dislocations occurred as pairs, approximately 1000 Å apart, with…
Abstract Im Verlauf von vier Jahren gelang die Synthese des Chlorophylls a aus vier relativ einfachen Pyrrol‐Derivaten. Eine neue Porphyrin‐Synthese verläuft in fünf Stufen mit einer Gesamtausbeute von etwa 50%. Das Produkt ist nicht mit anderen Porphyrinen verunreinigt. Durch Erhitzen des oxydierten Porphyrins in Ess…
Abstract Der hohe Siedepunkt (189,0°C) und die Trouton‐Konstante (29,6) der Dipol‐Verbindung Dimethylsulfoxyd beweisen eine Molekülassoziation im flüssigen Zustand. Die Temperaturabhängigkeit verschiedener physikalischer Eigenschaften (Dichte, Brechungsindex) läßt auf einen Assoziat‐Abbau zwischen etwa 40 und 60°C sch…
Abstract The attenuation of an ultrasonic wave by direct interaction with the conduction electrons in a metal is analyzed without making any special assumptions about the shape of the Fermi surface. The problem is reduced to a calculation of the currents set up in a stationary lattice by forces on the electrons, some…