Materials Literature
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A study has been made of the behaviour of {1012} ⟨011⟩ type deformation twins in fatigued cadmium, zinc, magnesium and titanium. Plastic deformation is accentuated at twin interfaces, which subsequently become serrated : the serrations are accommodated by closely spaced kink boundaries. Pre-existing twins are broken u…
The general arrangement of cytoplasmic organelles in Amphipleura pellucida Kutz. is similar to that in other naviculoid diatoms. The chromatophores are parietal with a single, non‐membrane‐limited, pyrenoid. The pyrenoid is crossed by several double‐disc lamellar bands which are occasionally interrupted by less dense…
The effect of pre-existing micro-cracks on the fracture of [010] tungsten single crysta's has been investigated. Cleavage cracks on (010) planes were introduced into the edge of the specimens by a spark-machining technique. Tensile tests at 77°K showed that the fracture stress was dependent on the crack length accordi…
The reversible dimerization of the anion radical of 7,7,8,8-tetracyanoquinodimethane in aqueous solution has been studied spectroscopically. Analysis of the spectra yields an equilibrium constant for dimerization (2A−⇆A2=) at 25° of 2.5×103 liter/mole and a heat of dimerization of −10.4 kcal/mole dimer.
Quantitative X‐ray diffraction methods were used to define the kinetics of spinel formation. Diffusion controlled reaction rate constants were calculated on the basis of the reaction models of Jander, Dunwald‐Wagner, Valensi, Zhuravlev et al. , Ginstling‐Brounshte'n, and Kroger‐Ziegler. The model proposed by Valensi i…
Composition and protectiveness of the iron sulfide film, formed as a result of the liquid phase H2S-CO2-H2O corrosion of Armco iron, have been related to the initial pH of the solution. Composition of the film was determined by electron diffraction analysis. Protectiveness of the film was determined by measuring the w…
Kominek, Leo A. (University of Illinois, Urbana), and H. Orin Halvorson. Metabolism of poly-beta-hydroxybutyrate and acetoin in Bacillus cereus. J. Bacteriol. 90:1251-1259. 1965.-The synthesis of poly-beta-hydroxybutyrate (PHB) in Bacillus cereus strain T begins after the cessation of logarithmic growth. Its accumulat…
Tris-sarcosine calcium chloride, (CH 3 NHCH 2 COOH) 3 ·CaCl 2 , is ferroelectric below the Curie point, 127°K, where the dielectric constant, ε b , at low frequencies shows a sharp peak. The dielectric constants ε a and ε c . do not show any noticeable anomaly at the Curie point. The dielectric measurement at a microw…
The crystal structure of porphine, the parent compound in the porphyrin series, was determined by x-ray diffraction analysis. The phases of the normalized structure factors were obtained by the probability methods of Hauptman and Karle. The crystals are monoclinic with four molecules per unit cell, and the C2h5—P21/a…
Abstract Use of reinforcing fillers in elastomers ranks as one of the two most important processes in rubber technology—only vulcanization can be considered to surpass it in its universal application. From the time of the earliest observations that certain pigments are capable of imparting reinforcement to natural rub…
Mie scattering calculation to support theory that interstellar extinction is caused by graphite particles
The Rosseland mean due to Compton scattering at temperatures ranging from kT = 0.01mc2 to kT = 0.35mc2 and for densities ranging from p = 10 gm/cm2 to p = 106 gm/cm2 is calculated. In most of this semidegenerate region, Compton scattering dominates over electron conduction, bound-free transitions and free-free transit…
The energy of an extended dislocation is decreased if the energy of the stacking fault formed between its component partial dislocations is reduced. It is suggested that such an effect may influence the yield stress of an alloy containing coherent precipitates of lower stacking-fault energy than the matrix. The propos…
Polymers formed between three ligands and selected metal ions were prepared and their thermal stability in air was investigated. 1,5-Dihydroxynaphthalene-2,6-dicarboxylic acid (1,5-N-2,6) formed coordination polymers with Zn, Ni, Al, and Fe+3. Zn-1,5-N-2,6 was more stable than the corresponding Fe and Ni polymers. Pyr…
The dependence of the drape of fabrics on bending stiffness and shear stiffness has been investigated. A version of the Fabric Research Laboratories Drapemeter is described, and the drape coefficient obtained is used as a measure of the fabric drape. The regression of the drape coefficient on bending length for a larg…
A noncatastrophic fracture was shown to exist in the three‐point bending test with a “hard‐beam” machine when an artificially cracked or notched specimen was used. In this mode of fracture the energy produced by external work was transformed completely into the effective surface energy (fracture energy) of the specime…
Total surface area is a fundamental property of layer silicates, and it has been used as a cri-terion for identification. Early methods for de-termining surface area used nitrogen or ethane gas and were based on the principle that solid materials will adsorb a monomolecular layer of the gas at a particular pressure (4…
Phytoplankton the passively floating or weakly swimming plant life found in bodies of water is generally inconspicuous. It is of basic importance in lakes and seas, however, as the primary producer of the organic material on which other forms of aquatic life depend; and it is probable that its total photosynthetic out…
Abstract A new method of obtaining the kinetic parameters from thermogravimetric curves has been proposed. The method is simple and applicable to reactions which can not be analyzed by other methods. The effect of the heating rate on thermogravimetric curves has been elucidated, and the master curve of the experimenta…
Abstract Die durch Bestrahlung mit Elektronen von 40 bis 80 kV hervorgerufenen Änderungen der Gitterstruktur von Polyäthylen(PÄ)‐ und Polyoxymethylen(POM)‐Einkristallen wurden unterrsucht. Dazu wurden Lage, Intensität und Linienbreite der Reflexe im Elektronenbeugungsdiagramm in Abhängigkeit von der Bestrahlungsdosis…