Materials Literature
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A comparison is drawn between the thermal behaviour of poly-[2,2-propane-bis-(4-phenyl carbonate)] and the model compound diphenyl carbonate. On this basis a rearrangement mechanism is suggested to account for the main chemical and physical features of the degradation of the polymer between 300 and 389°.
Spectra of some rare earth activated phosphors, where may be Y, Gd, or La, are presented. The most efficient phosphors, particularly in the matrix, are those activated by Sm +3 , Eu +3 , and Dy +3 . It is shown that has an output efficiency comparable to commercial phosphors. , when properly prepared, has an output in…
Abstract The equilibrium Ca(OH) 2 ⇌ CaO+H 2 O has been studied at pressures of steam up to 50 bars and at temperatures of up to 800° C. The dissociation pressures determined are in agreement with the data derived by some previous workers at pressures of less than one bar but they conflict with data published for highe…
沸点曲線にもとずく気液平衡の決定を検討するために沸点計を作製し, メタノールー水系.エタノールー水系, ノープロパノールー水系, i-プロバノールー水系. アセトンー水系, メタノールーループロバノール系の760mmHgにおける沸点を実測した。Taoの式を基礎式として気液平衡を決定したところ. 計算値と文献値は良好な精度で一致した. 沸点測定は比較的簡単であり, また正確に行ないうるので気液平衡実測値の検討にも役立つものと思う.
The technique of removing thin sections of anodic oxides by vibratory polishing has been used in conjunction with implantation of anion, cation, and inert gas radiotracers to measure the mode of anodic oxide formation on Zr and Ta. The measured transport number for metal during the growth of (0.28) is in good agreemen…
The cathodic reduction process of MnOOH , which is produced from γ ‐ MnO 2 or β ‐ MnO 2 by electrochemical reduction, was studied in 9 M KOH with various particle sizes of the original γ ‐ MnO 2 and various depths of discharge. The polarization of MnOOH produced from electrolytic γ ‐ MnO 2 is small, less than 60 mv, u…
C,ystal stl'llcture oJ billGlY alld lemary carbides oJ trallsition melals and electronic structure oJ some simple carbides and nitrides are reviewed; the carbide p recipitation Jrom steels is also discussed. Various carbide structures are classified -ill io some groups alld types according 10 Ihe mode oJ metal atom ar…
Some members of the homologous series of the 4′-n-alkoxy-3′-nitrodiphenyl-4-carboxylic acids, which have been already described by Gray, were prepared. Their polymorphism in the smectic state was investigated. The relations of selective miscibility between the liquid crystalline modifications have been explored by the…
Abstract not Available.
The incorporation of divalent europium in the compounds , , and produces phosphors of high luminescence yield. These phosphors respond well to both long and short wavelength ultraviolet excitation, as well as to cathode ray bombardment. The peak of the emission band occurs at progressively shorter wavelength and narro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAqueous systems at high temperature. Solubility to 200.degree. of calcium sulfate and its hydrates in sea water and saline water concentrates, and temperature-concentration limitsWilliam L. Marshall and Ruth. SlusherCite this: J. Chem. Eng. Data 1968, 13, 1, 83–93Publication…
To examine the conditions brought about upon initiation of core spraying, a 36-rod assembly was heated to different temperatures and then spray cooled. The runs were made at atmospheric pressure using two kinds of assemblies, both made up of heater rods of 15 mm outer sheath diameter, arayed into 6×6 lattice accommoda…
No general theory exists that can predict the efficiency of phosphors with electronic transitions in localized centers. In this paper a survey and discussion are given of the correlation between fluorescent properties and chemical properties, like composition and structure. Points of discussion are ( a ) choice of the…
Abstract Thin films of n‐conducting In 2 O 3 are prepared by reactive sputtering. The concentration of conduction electrons is changed by a heat treatment between n e = 10 17 and 10 20 cm −3 ( T = 300°K). Concentration and temperature dependence of the electron mobility indicate an intense scattering at charged imperf…
Abstract Besides the so-called β-Al2O3 (R2O·11Al2O3; R=Na or K), there have been found two kindred compounds with approximate formulas, R2O·7Al2O3 (β′-Al2O3) and R2O·5Al2O3(β″-Al2O3). The structure determination of the latter two compounds was undertaken; the results are compared with the structure of β-Al2O3 in the p…
On heat treatment in air the solubility of MgO or TiO 2 , in Al 2 3 is too small to detect by lattice parameter shifts. The solubility of MgTiO 3 in Al 2 O 3 in air increased to the measured values, expressed as atomic fractions Mg:A1or Ti:A1of0.82 × lo‐ 2 , 1.43 × 10 ‐2 , and 1.75 × 10 ‐2 at 1250°, 1650°, and 1850°C,…
The theory of Rayleigh scattering from density fluctuations is applied to data taken in glycerol and n-butanol over wide temperature ranges. It is shown that Brillouin scattering is useful in evaluating the viscoelastic parameters of a liquid when all corrections are properly applied. The position, half-width, and int…
THE MAXIMUM CRACK WIDTH MEASUREMENTS FROM A NUMBER OF CRACK WIDTH INVESTIGATIONS WERE EXAMINED USING STATISTICAL METHODS. PREVIOUSLY PROPOSED EQUATIONS FOR MAXIMUM CRACK WIDTH WERE COMPARED AND NEW EQUATIONS WERE PROPOSED AS A RESULT OF THE ANALYSES. INTEREST IN CRACK WIDTHS IN FLEXURAL MEMBERS HAS BEEN STIMULATED BY…
Abstract Empirical size‐dependent growth rate models are studied for their effect on the population density distributions from a continuous, mixed suspension, mixed product removal (CMSMPR) crystallizer. The growth rate models and/or their corresponding population density distributions are examined for continuity, con…
The behaviour of the magnetic properties of the 4T1g term under simultaneous perturbation by spin–orbit coupling and an axial ligand-field is presented. The theory is applied to the variation with temperature of fifteen octahedral cobalt(II) complexes in the range 80–300°K. The values of k, the orbital reduction facto…