Materials Literature
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The concept of modeling an impact cratering event with an explosive event with the explosive buried at some equivalent depth of burst (d.o.b.) is discussed. Various and different ways to define this equivalent d.o.b. are identified. Recent experimental results for a dense quartz sand are used to determine the equivale…
The synthesis is described of an FeII porphyrin carrying an anthracene bridge across one face and a pyridine bridge across the other; this molecule minics the structural features and properties of natural oxygen-carrying systems.
Magnetic susceptibility data have been measured in the temperature range 1.75 to 60 K for the following structurally characterized, single chloride-bridged copper(II) chain compounds: dichlorobis(dimethyl sulphoxide)copper(II), dichlorobis(imidazole)copper(II), aquo(caffeine)dichlorocopper(II), and dichloro[2-(2′-meth…
Abstract The temperature dependence of the dielectric constant, polarization, and elastic compliance as well as the field dependence of the polarization and strain at different temperatures was measured at lead magnesium niobate single crystals for three different directions. From the results some conclusions with res…
A low oxygen content silicon crystal ingot with 2.5 × 10 17 to 3.5 × 10 17 atoms·cm -3 was obtained. It was grown by using the Czochralski crystal growth furnace heated with a graphite heater connected to a three phase electrical source, and by controlling the seed and the crucible rotation in conjunction with the flu…
Known interrelationships between fabrication, phase equilibrium, microstructure, and properties are reviewed for dense, polyphase silicon nitride materials fabricated with densification aids. In the first and second sections the raw materials, the manufacture of silicon nitride powder, impurities in these powders, and…
An hexagonal order is frequent in liquid crystals, namely in many smectic phases. We consider here the non smectic phases formed by hexagonally packed, indefinite and flexible rods. The Volterra method enables three main components of the translation defects to be defined : transverse edge and screw dislocations and l…
Direct Observations of the Arrangement of Atoms around Stacking Faults and Twins in Gold Crystals and the Movement of Atoms Accompanying Their Formation and Disappearance, Hashimoto, Hatsujiro, Takai, Yoshizo, Yokota, Yasuhiro, Endoh, Hisamitsu, Fukada, Eisaku
The theoretical determination of the initial domain structure and the phase boundary orientation inducing a wanted domain structure in the new phase seems to be a study of worthwhile interest. The W. L. R. theory {1} is not suitable for complex domain structure in each phase because mean distortions of the new phase c…
The adsorption of isopropyl alcohol and acetone on zinc oxide was studied by an infrared technique which revealed that isopropyl alcohol is dissociatively adsorbed at room temperature to form zinc alcoholate and hydroxyl group on the surface, while the adsorption of acetone takes place in its enolic form. When adsorbe…
Segment-long-spacing crystallites and reconstituted fibrils have been made from collagen extracted from the ejaculatory duct of the adult male locust, Locusta migratoria. These show the same banding pattern after positive staining as segment-long-spacing crystallites and fibrils made from mammalian type I collagen. Na…
A study is made of the crystallization of amorphous antimony film deposited on a glass substrate. The substrate is maintained at a desired temperature between 20°C and 90°C. The crystal growth in the films of thickness 210-550 Å is directly observed through an optical microscope. At any substrate temperature T s the r…
A. E. Underhill and D. M. Watkins, Chem. Soc. Rev., 1980, 9, 429 DOI: 10.1039/CS9800900429
Energy transfer from a sensitizer to an activator via Gd 3+ ions is discussed. This is done for the Bi 3+ → Dy 3+ and Sb 3+ → Dy 3+ transfer in , and for the Bi 3+ → Tb 3+ transfer in . The phosphor shows Tb 3+ luminescence with a quantum efficiency of 80% for excitation of Bi 3+ . After excitation of Bi 3+ , energy t…
The processing, structure, and properties of a low-cobalt, ternary Fe-28Cr-10.5Co isotropic magnet alloy (Chromindur II), developed for use in the telephone receiver, are described. The new alloy is easy to process, and permits a convenient low-temperature recrystallization anneal of heavily cold rolled strips leading…
Des séries de ferrites de Li substitués avec du zinc, du titane et du chrome ont été étudiées de 4 à 300 K. Les paramètres hyperfins des différents sites élémentaires de fer ont été déterminés. La variation du champ hyperfin supertransferré Δ HHST due à la substitution de Zn ou de Li en site A, de Ti, de Cr ou de Li e…
Changes in the pH or concentration of sodium silicate solutions produce changes in the degree of polymerisation of the silicate species, and these have been followed by the technique of trimethylsilylation. Provided that the pH remains relatively high, above ca. 10 or 11 according to concentration, equilibrium is rapi…
Using four-circle diffractometry in a dynamic mode, the course of the topochemical photodimerization of 2-benzyl-5-benzylidenecyclopentanone has been determined.
The optical non-linearity of a nematic liquid crystal (NLC) is considered. The strongest effect studied is due to the local turn of NLC director. The possibility of wavefront conjugation by four-wave interaction in a NLC is considered. Strong effects of self-focusing in a NLC due to the orientational mechanism of non-…
Crystal/glass partition coefficients of rare-earth elements (REE), Ba and Sr were precisely determined for the systems prepared by partial melting and partial solidification of high-alumina basalt at 30kb and alkali olivine basalt at 20 and 30kb. At 30kb partial melting produced garnet and clinopyroxene as the solid p…