Materials Literature
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Depression in the transition temperature of Glauber's salt due to the presence of WO42– and its polyanions have been measured at different pH values. The average degrees of condensation calculated from these measurements indicate the existence of mono-, tri-, and hexa-polytungstates. Polymerisation towards WO3 takes p…
The imjJortance oj inclusions in steel has been velY milch ellljJhasi;:ed, and many investigations have been carried out, but in most cases too 1Ilalry variables have been jJresented to draw wry definite conclusion.
A further study has been made of the curling during growth of thin crystal plates of 2,5-di-t-butyl-1,4-dimethoxybenzene, and this behaviour has been related to the approximate structure of the compound deduced from its optical properties. It is suggested that the curling may be due to differential adsorption of the s…
Absorption spectra of Mn2+ ion in alumino-boro-phosphate, magnesium-aluminoborate and soda-lime-silica glasses were studied within the range, 16000 cm-1 30000 cm-1 Five absorption bands were observed at or around 19200 cm-1 [4Γ4(G)], 23300 cm-1 [4Γ5(G)], 24000 cm-1 [4Γ3,4Γ1 (G)], 28100 cm-1 [4Γ5 (D)] and 29300 cm-1 [4…
By means of high-frequency conductance measurements, the rates of the alkaline hydrolyses of ethylene and propylene carbonates have been determined at 15, 25, and 35°. The rate constants found are considerably greater than those previously reported, and a source of error in the earlier determinations is discussed. The…
The processes of precipitation in Cu-Cr binary alloys with 0.05∼0.91 wt%Cr have been investigated by electrical resistivity, hardness and transmission electron microscopy, with the following results: (1) Increase in electrical resistivity due to clustering of solute atoms or zone formation is not detected at above/300…
The study of the clay minerals in the Tchad solodized solonetzes and in the associated vertisols has been realized by X-ray diffraction analysis. The neoformation, stability and weathering of the montmorillonites characterizing these soils are herein described.
The relationship between the geometrical structures of plain-woven filament fabrics and the directional effect of fabric-on-fabric static friction has been investigated with the following results:(1) Frictional force F per unit area for every relative direction of rubbing is related to pressure N by the relation F=kNn…
A resistance heated crystal puller has been used to grow crystals of NbO, Ti2O3, and Al2O3, which have melting points of 1945, 2000, and 2050°C, respectively. The puller incorporates a modified version of a tantalum tube furnace described previously, which is capable of operating in oxidizing, neutral, and reducing at…
The roots of Cynanchum wilfordi HEMSLEY were found to contain a glycoside mixture. The glycosides showed a positive Keller-Kiliani reaction, suggesting the presence of a 2-deoxysugar. The sugar portion of the glycoside was found to be D-cymarose. The aglycone was shown to be an ester. Alkaline hydrolysis of the ester…
The serrated yielding exhibited by metals during tension tests at temperatures near absolute zero is the principal consideration of this paper. Stress-strain curves are presented for various metals including Armco iron, “K” Monel, and titanium at temperatures from +200 to −269 C. The variations of yield stress and duc…
Abstract A new Eu 3 O 4 preparation method is described. Eu 3 O 4 is produced by the solid state reaction between Eu and Eu 2 O 3 . Static magnetic susceptibility measurements were made by the Faraday method from 6 to 300°K. Eu 3 O 4 was found to be ferrimagnetic with a Curie point of 77 °K.
The so-called thermodynamic paradox associated with a ferrite-loaded rectangular waveguide is discussed. It is shown that the various structures introduced by some authors to resolve the paradox are, even in the limit case, different structures from the original one leading to the paradox, and therefore they do not he…
Abstract It is frequently stated that soils with well‐developed A and B horizons are sufficiently weathered that their clays will reflect strongly the influence of the climatic environment. Studies of three profiles developed from sedimentary rock materials in northern Utah show a high association between parent mater…
Abstract
The plastic deformation of type II diamond plates has been examined by three-point loading at temperatures between 1700 and 1550°c. Plastic bending was produced at 1700°c but the degree of bending at a particular stress was less than with experiments at 1800°c which have been reported. No plastic deformation was detec…
The semiconductivity and photoconductivity of the solid free radicals galvinoxyl (2,6-di-tert-butyl-α(3,5-di-tert-butyl-4-oxo-2,5-cyclohexadien-1-ylidene) p-tolyloxy radical) and DPPH (α,α-diphenyl-β-picryl hydrazyl) and related compounds have been examined. Their behaviour is similar to that of diamagnetic poly-cycli…
Matthew H. Hohn, Joan Hellerman, New Diatoms from the Lewes-Rehoboth Canal, Delaware and Chesapeake Bay Area of Baltimore, Maryland, Transactions of the American Microscopical Society, Vol. 85, No. 1 (Jan., 1966), pp. 115-130
Abstract Des mesures du temps de retournement en régime impulsionnel ont été faites et mettent en évidence, à faibles champs, un retournement en deux temps. D'autre part, de nouvelles mesures du champ coercitif sont également présentées.
The prediction of ligand-field theory that for low-spin octahedral complexes the size should decrease along the series Cr(III), Mn(III), Fe(III), and Co(III) has been examined by comparing the lattice constants of the complex cyanides of formula K3MIII(CN)6; a steady decrease along the series provides substantial evid…