Materials Literature
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Values for the physical solubility of nitrogen as well as for the content of chemically dissolved nitrogen in glass melts are given. The form in which the nitrogen is present in the glass melts is discussed and an attempt is made to explain chemical interaction between nitrogen and the glass melt. The dependence of th…
Abstract Soluble collagen from guinea pig skin has been subjected to sequential digestion with purified collagenase and trypsin. The small quantity of hexose present in the collagen can be detected in the digest largely as relatively basic glycopeptides. One of these glycopeptides has been obtained in pure form and ac…
Abstract The following model conception describing heat transfer in amorphous materials, especially in high polymers, is derived. An “elementary” thermal resistance is assigned to each bond between adjacent atoms. The thermal resistance of a macroscopic amorphous specimen is that of a three-dimensional network consist…
Abstract Considerable stress softening occurs in both gum and filler-loaded vulcanizates and when compared at the same stress the extent of softening is similar in both gum and filled vulcanizates. It thus appears that the softening process is mainly due to the rubber phase alone. Apparent differences between the stre…
Abstract A model has been developed to study chemical reactions which occur in oxygen‐nitrogen mixtures during very rapid cooling in small‐diameter tubes. The system considers both homogeneous gas phase reactions and surface reactions based upon a simplified mass transfer mechanism. With an energy balance used to dete…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Frank C. Palilla and Albert K. Levine, "YVO4:Eu: a Highly Efficient, Red-Emitting Phosphor for High Pressure Mercury Lamps," Appl. Opt. 5, 1467-1468 (1…
Abstract This paper analyzes the growth or collapse of a spherical bubble in an incompressible, viscous fluid. Theoretical results include the timewise variations in the bubble size and its growth or collapse rate, the fluid pressure, and the rate of energy dissipation. The analysis is general and may be applied to bo…
The incorporation of slip dislocations at the coherent twin boundary has been analysed for the (112) [111] type twins in hexagonal close-packed zinc crystal by applying matrix algebra. The effects of the various dislocation incorporation processes on the growth and untwinning of the existing twin are discussed from th…
Controlled antiferromagnetic domain reversals have been observed in single crystal Cr2O3. Switching between substantially single domain states has been achieved with the simultaneous impression of electric and magnetic fields of approximately 10 kV/cm and 5 kOe, respectively. The switching energy is closely proportion…
The relation between self-diffusion coefficients and grain boundary energy proposed by Borisov et al. (1964) has been examined for various metals. Satisfactory agreement was obtained between observed and calculated values.
Abstract An Hand der bekannten Bewegungsgleichungen für ein einzelnes Feststoffteilchen werden die Voraussetzungen diskutiert, unter denen eine exakte Berechnung der Bewegungsbahnen möglich ist. In zwei Sonderfällen, der Teilchenbewegung ohne Einfluß der Schwerkraft und der Teilchenbewegung in der Vertikalen mit Berüc…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
A high‐temperature X‐ray diffraction study of a high‐purity PbZrO 3 specimen at 25° to 236°C is reported. The symmetry of the perovskite sub‐cell of PbZrO 3 was determined unambiguously by observing the splitting of the line groups N = 12 and N = 16 when the diffraction pattern was indexed on the basis of the perovski…
After prolonged cyclic stressing in rolling contact, AISI 52100 bearing steel parts develop extensive regions of microstructural alteration, designated as white etching areas. These are oriented in predictable directions relative to the rolling track. Lenticular carbides are always associated with these areas. Evidenc…
Laminated, diatomaceous sediments of the Gulf of California consist of regularly alternating light-colored (diatom-rich) and dark-colored (clay-rich) laminae, approximately 2 mm. thick. The mean contents of opal (as diatom frustules) and quartz in the laminae, determined by X-ray diffraction methods, are: light-colore…
The effects of excluded volume on the existence and nature of a phase transition in an infinitely long double-stranded helical polymer are discussed in relation to the recent treatment of Poland and Scheraga, which showed that, if the entropy of a closed polymer loop of 2l links (corresponding to a diassociated length…
Possible patterns of vibration-induced splitting in the absorption band of localized electrons in solid are investigated within the Condon approximation. The modes of lattice vibrations around the imperfection which give rise to the level splitting of degenerate excited states are classified into active and potentiall…
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