Materials Literature
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A detailed structure for Tussah silk fibroin has been derived which is in agreement with the X-ray diffraction data. The structure is similar to that of Bombyx mori fibroin in that it is based on antiparallel-chain pleated sheets; the method of packing of the sheets, however, is quite different. This difference in pac…
The system BaTiO 3 –SiO 2 is characterized by two congruently melting compounds and a compound having a subsolidus stability maximum. A barium analogue of the mineral sphene, BaTiSiO 5 , was shown to melt congruently at 1400°C, and BaTiSi 2 O 7 melted congruently at 1250°C. The gem mineral benitoite (BaTiSi 3 O 9 ) wa…
This paper gives a survey of films and film combinations used for reflecting optics. The preparation and properties of unprotected mirror coatings, protective layers for front surface mirrors, reflection filters, and replica mirrors are discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of Carbon Deposited from Carbon Monoxide on Iron, Cobalt and NickelL. J. E. Hofer, E. Sterling, and J. T. McCartneyCite this: J. Phys. Chem. 1955, 59, 11, 1153–1155Publication Date (Print):November 1, 1955Publication History Published online1 May 2002Published inis…
Summary The linear strain hardening observed after the easy glide region in face-centred cubic single crystals at sufficiently low temperature is explained by assuming that all the Frank-Read sources of the active slip system are in action, and form small active slip planes bounded on all four sides by Cottrell barrie…
Silver migration may be defined as a process by which silver, when in contact with insulating materials under electrical potential, is removed ionically from its initial location, and is redeposited as metal at some other location. This process requires adsorption of water on the insulation surface. Silver is unique i…
Experience with the scanning electron microscope has shown that there are fields of application where this instrument has distinct advantages over the conventional transmission microscope (with or without replicas) and the reflexion electron microscope. For example, there are specimens which are too thick to be viewed…
Summary The present paper treats in some detail the various mechanisms by which lattice defects are formed by moving dislocations. Particular attention is paid to the role of thermal energy in these processes and to the special features of extended dislocations in metals with low stacking fault energies. The results a…
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Este método, que mide la retracción total de morteros de resinas al pasar de la forma plástica al estado completamente curado, puede ser útil para predecir la retracción máxima de dichos morteros.
Se indican las normas prácticas que se han de seguir al llevar a cabo el curado eléctrico del hormigón.
Se ha conseguido que la cocción con carbón pulverizado sea económica gracias a un nuevo modelo de parrilla. Un nuevo procedimiento de cocción con granulación y recubrimiento de los gránulos mediante una capa exenta de carbón, permite reducir considerablemente las pérdidas de CO del horno vertical.
Se destaca, tomando como base numerosas determinaciones, la importancia, en el plan industrial, de la estructura granulométrica de las arcillas, como factor principal que determina la actitud de una arcilla para preparar un determinado producto.
A treatment is given of the hysteresis loops of dilute mixtures of various sizes of ferromagnetic particles. Three ranges of particle size are considered: very small particles called ``super-paramagnetic'' which are single domain and equilibrate resulting from thermal vibrations, single domain particles which are larg…
Co mpositional proximity to a morphotropic t ransformation between two ferroelectric solid-s olution phases seems to yie ld ceramic transducers having desirable properties over a wide range of te mperature. Examples of t his phenomenon were observed in the systems PbTi03-PbZr03, PbTi03-PbO:Sn02, PbTi03-PbZr03-PbO:SnO"…
Abstract Previous theoretical work by Stoner & Wohlfarth (1948) on the magnetic properties of single domain ferromagnetic particles is extended to take some account of the interaction between the particles. Earlier theoretical considerations of the interaction problem are critically discussed (§2), and the experim…
Abstract The method described previously for measuring the energy stored in cold-worked metals has now been applied to nickel and arsenical copper as well as to pure copper. Torsion, tension and compression have been used as methods of deformation, and the heating rates were 2, 4 and 6° C/min. For all these materials,…
The theory of the magnetic susceptibility of graphite is presented in terms of a three-dimensional Wallace electron energy band structure. The experimentally observed variation with temperature is explained in a satisfactory manner, provided the interplane resonance integral occurring in the band approximation is give…