Materials Literature
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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…
High temperature (1460°C) hexagonal BaTiO3 was found to be stable at temperatures below 700°C. This structure was stabilized at low temperature by an increase in surface free energy that is significant for small crystallites. The hexagonal phase was a precursor for reversible adsorption and desorption of surface carbo…
Abstract The acicular (needle‐like) clay minerals, sepiolite and palygorskite, were found to be widespread in late Cenozoic sediments of the Texas High Plains. Five soils developed in these sediments, or in materials derived thereform, were analyzed to determine if sepiolite and palygorskite were stable under soilform…
1 Twin intracellular recordings were made from the bag region of Ascaris muscle in order to make conductance measurements. The preparation was bathed in a cool (22 degrees C) Ringer solution to abolish the large spontaneous depolarizing potentials and to improve stability for recording.2 The resting membrane potential…
Abstract Almond shells have been used as raw material to prepare activated carbons. The preparation conditions, by direct activation of the raw material with CO 2 or air, or by activation after carbonisation under nitrogen, have been compared in respect to the percentage burn‐off and the adsorptive properties of the r…
Constitutive laws hitherto applied to two-phase superplastic alloys have not taken into account their two-phase nature. In order to determine the influence of each of the phases on the constitutive laws, α/β brass was studied for different phase fractions and at different temperatures. A constitutive law is found in w…
The effects of carbon formation on methanation activity of nickel and nickel bimetallic catalysts were investigated. Carbon was deposited on these catalysts at 675-700 K, 1 atm, H2/CO = 2 and space velocities of 80,000 to 200,000 h−1 over a period of 6-24 hours. Specific methanation activities were measured before and…
It is shown that two new classes of smectic liquid crystals - esters and salicelidenanilines - have ferroelectric properties. The new ferroelectric smectics have a hightened hydrolitical stability. Their electrical and heat properties are investigated, the correlation between a chemical composition and spontaneous pol…