Materials Literature
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Expressions have been derived for the optical birefringence and elastic moduli of an idealized semicrystalline polymer in terms of the molecular orientation. The predicted birefringence and moduli show qualitative agreement with previous experimental data for polyethylene at low extension ratios. A result of particula…
"Applied Clay Mineralogy." Geologiska Föreningen i Stockholm Förhandlingar, 84(4), p. 533
Abstract Equations are given for estimating equivalent isothermal life from thermogravimetric data and for estimating the apparent activation energy for volatilization even though the nature of the kinetic process is unknown. Illustrative data for polytetrafluoroethylene are presented. The importance of using sample t…
An x-ray diffraction study of the crystal structure of Cu2B10H10 shows that the earlier proposal that the B10H10—2 ion has D4d symmetry is correct, and further establishes the covalent nature of the interactions of CuI with B atoms forming the edges of the polyhedron. There are eight Cu2B10H10 in a unit cell having di…
(I) The requirements for making a critical test of whether two- or three-dimensional surface nucleation controls the radial growth of lamellar spherulites in bulk are discussed. Radial-growth-rate data were obtained on spherulites of polychlorotrifluroethylene (PCTFE) for a wide range of supercooling ΔT, and found to…
The effects of different fluxing ingredients on melting characteristics, thermal expansion, DC resistivity and dielectric properties of the glass compositions, MgO 10, CaO 10, Al2O3 19, SiO2 61% and MgO 18, Al2O3 19, SiO2, 63% were studied. Li2O is the strongest fluxing ingredient but it increased expansivity and diel…
The Hall coefficient of alloys of up to 5% Ni, Co, Fe, and Mn in Au has been measured from 4.2°K to room temperature. The Hall coefficients are strongly temperature dependent in these alloys and have been fitted to an equation of the form R=R0+R1χ, where R0 is close to the value for the Hall coefficient of pure Au, an…
Basic domain structures of epitaxially grown single-crystal thin films of iron are investigated by the powder pattern technique. For films with (001) orientation, where two easy axes of magnetization lie within the plane of the film, a checkerboard pattern, i.e., a regular square domain pattern made up of 90° walls on…
Abstract Es wurde die Kinetik der CaCO 3 ‐Bildung aus dem Oxyd unter verschiedenen CO 2 ‐Drucken untersucht und gefunden, daß die Geschwindigkeit der CO 2 ‐Aufnahme bei Temperaturen über 800 °C durch die druck‐abhängige Keimbildung und den ebenfalls druckabhängigen Wachstumsprozeß bestimmt wird. Bei 800 °C und Drucken…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFriedel-Crafts Isomerization. III. Aluminum Bromide-Catalyzed Isomerization of Bromofluorobenzenes, Bromochlorobenzenes, and DibromobenzenesGeorge A. Olah, William S. Tolgyesi, and Robert E. A. DearCite this: J. Org. Chem. 1962, 27, 10, 3455–3464Publication Date (Print):Octo…
J. E. Kirk, M.D., M. Chieffi, M.D.; Variation with Age in Elasticity of Skin and Subcutaneous Tissue in Human Individuals, Journal of Gerontology, Volume 1
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
The formation of elongated dislocation loops in deformed copper single crystals has been studied by transmission electron microscopy. A mechanism by which elongated loops could be formed is considered in detail. The density of these loops was found to increase only slightly during stage I of the stress-strain curve, b…
The theories of three non-linear optical processes are given: (i) the creation of excitons by simultaneous absorption of two photons of different frequency; the particular case of Cu 2 O is treated in detail; (ii) the generation of second-harmonic radiation from a monochromatic primary beam in a crystal without a cent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE ADSORPTION OF FLEXIBLE MACROMOLECULES. PART II. THE SHAPE OF THE ADSORBED MOLECULE; THE ADSORPTION ISOTHERM SURFACE TENSION, AND PRESSURE1A. SilberbergCite this: J. Phys. Chem. 1962, 66, 10, 1884–1907Publication Date (Print):October 1, 1962Publication History Published o…
The solid solutions (1- x )FeTiO 3 - x Fe 2 O 3 exhibit strong ferromagnetic moments in the composition range 0.1< x <0.6. In this region cation ordering is thought to occur such that the Fe 2+ and Ti 4+ ions occupy alternate (111) layers, thus forming sublattices A[ x Fe 3+ , (1- x )Fe 2+ ] and B[ x Fe 3+ , (1- x )Ti…
It has been shown by DeBlois that surface flaws decrease the magnitude of the nucleation field of iron whiskers below the ideal theoretical value Hn0=2K1/Ms. It is assumed here that the number of flaws in area S is determined by a Poisson distribution, with mean number λS (λ=const); that each flaw independently has a…
The dielectric constant of vacuum-deposited ZnS films was measured as a function of thickness in the range of 350 Å to 4 μ. For room temperature deposition, a sharp anomaly was found in the dielectric constant vs thickness curve. The highest measured constant was 34.7 at a thickness of 900 Å. As the thickness increase…
Abstract 1) The most active catalyst was obtained when 400 mg. of silk-fibroin was boiled with 30 ml. of 0.5% aqueous solution of rhodium chloride for ca. 30 min., and the resulting chelate was then reduced. 2) The activity of this catalyst was not influenced significantly by the conditions for its preparation and was…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Application of Simple Equations for Calculating Bond Dissociation Energies to Thermal Degradation of FluorocarbonsL. A. ErredeCite this: J. Org. Chem. 1962, 27, 10, 3425–3430Publication Date (Print):October 1, 1962Publication History Published online1 May 2002Published i…