Materials Literature
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SummaryAs part of a continuing effort to improve the durability of decorative plated automobile parts, a deleterious type of chromium cracking and the changes in the microstructure of nickel brought about by addition of a sulphur-containing additive have been studied. Type Y cracking of 0·02–0·05 mil chromium deposits…
Investigation has been made on the fresh-water algae as represented in a small but unique collection from Shigatze and Gyangtze districts, southern Tibet, gathered from May to August, 1961, by Mr. H. J. Hwang, an ichthyological worker during the Tibetan Scientific Expedition organized by Academia Sinica. The collectio…
The algal flora of a small, artificial, ice-cave located in Northern Hungary is described. In this cave 23 species of algae (see in Table 3) were found of which the Cyanophyta and Chlorophyta occurred with approximately equal number. (9 vers. 11) It was found that the primary limiting factor influencing the penetratio…
Abstract There are several pieces of evidence in the published literature for the existence of a hexagonal crystalline form of polypropylene. Evidence obtained by infrared absorption, x‐ray diffraction, differential thermal analysis, and annealing experiments is consistent with the view that the quenched state of poly…
アイソタクチックポリビニルエーテルから誘導されたアイソタクチックポリビニルアルコール (isot-PVA) およびポリトリフルオロ酢酸ビニルから誘導されたシンジオタクチックポリビニルアルコール (synd-PVA) をアセトアルデヒドによりアセタール化した。isot-PVAはsynd-PVAよりも大きい反応性を示した。synd-PVAおよび各種の条件下でラジカル重合により製造したポリ酢酸ビニルから誘導されたPVAは, アセタール化に対して互にほぼ同じ反応性を示した。isot-PVAのホウ酸およびホウ砂との反応性も他のPVA試料のそれらよりも大きい。これらの結果およびポリ酢酸ビニルのケン化反応に関する結果から, ラジカル重合ポリビニ…
Polarization measurements have been made on individual electrodes in operating molten carbonate fuel cells by using a third idling electrode. Hydrogen was supplied to the anode and an air‐carbon dioxide mixture to the cathode. Overvoltages as a function of time from 10 −6 to 100 sec after current interruption have bee…
Nickel hydride is face centered cubic. H occupies the octahedral sites with a H/Ni ratio equal to 0,6 ± 0,1.
Abstract The photochemical effects of uv irradiation on ZnS single crystals are investigated. The crystals are exposed to short‐wavelength uv irradiation, in both high vacuum and a water vapour atmosphere. Certain crystals show weak photochemical decomposition even when irradiated in vacuum. An analysis of the experim…
The equilibrium relationships in the system and a portion of the system were constructed from quench, D.T.A., and high‐ temperature x‐ray data. The compatibility and solid solution relationships in the system are summarized. The pyrophosphate join is a simple eutectic‐type binary system with a maximum of soluble in an…
Abstract Rutile (TiO 2 ) single crystals of various degrees of stoichiometry have been compressed at temperatures in the range 600 to 1300 °C; there is no ductility below 600 °C. Cleavage has been observed on (100), (110) and (101) planes, the exact mode of fracture being dependent on orientation and composition. Thes…
Isothermal sections at 1010° and 800°C have been determined in the system by the quenching technique. A determined solubility of system at 1010°C is in good agreement with recent revisions of that binary melting diagram. The steep nature of the corundum liquidus curve in the system is found to continue into the ternar…
(1964). The Mechanism of Protection by Organic Coatings. Transactions of the IMF: Vol. 41, No. 1, pp. 121-126.
Materials and components used in the MSRE are described and design data are given. The objectives of the program are discussed. (P.C.H.)
Abstract not Available.
On décrit deux catégories de sulfures de terres rares et de sodium. Dans les deux cas, la terre rare T et l'ion Na ont la coordinence six. La première catégorie comprend les terres rares T = La, Ce, Pr, Nd. La structure peut être considérée comme étant du type NaCl, lacunaire et désordonnée. Les anions S forment un pa…
Nous avons étudié FeCr2O4 dans le but de déterminer sa structure magnétique. A la température de 4,2 °K la structure est certainement différente du modèle Yafet-Kittel et peut, en première approximation, être considérée comme une spirale ferrimagnétique du même type que celle proposée par Hastings et Corliss dans le c…
Dilute ferromagnetic alloys with iron, nickel, or cobalt as host metal and dilute alloys of transition metals with hosts such as copper, gold, silver, or zinc were studied using the Mossbauer effect. (R.E.U.)
The remarkable ability of liquid gallium to wet the surfaces of many solids, including human teeth (1), has stimulated interest in gallium alloys as possible filling materials in dentistry (1, 2). A number of gallium alloys which possess some of the properties necessary in dental filling materials have been reported (…
Abstract The reactions of the oxides SiO 2 , MoO 3 , and WO 3 with steam at temperatures between 400 and 700 °C and pressures of 5 to 500 atm were studied by means of the transfer method. The results were evaluated by a new method. In the system Sio 2 /H 2 O the formation of gaseous Si(OH) 4 , Si 2 O(OH) 6 , and [SiO…
Abstract The increase in resistivity of Cu single crystals oriented near 〈110〉 and 〈111〉 is measured as a function of integrated electron flux at various electron energies below 1 MeV. Specially prepared thin single crystals of about 0.1 mm thickness are used. It is found that the damage production curves thus obtaine…