Materials Literature
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The changes in the x-ray diffraction patterns of 16- and 25-μm-thick polyvinylidene fluoride films, caused by 6-kV corona charging at room temperature, are presented. The diffraction peaks corresponding to (100) and (020) α-crystalline forms tend to be considerably reduced while the (110) β-form peak changes in shape…
The phase diagram of the system ZrO 2 ‐CaO for the region ZrO 2 ‐CaZrO 3 was redetermined. The extent of the cubic solid solution field was ascertained by using a high‐temperature X‐ray furnace, precise lattice parameter measurements, and a hydrothermal technique. At 850 ± 150°C, the cubic solid solutions decompose by…
Clean evaporated potassium films have been studied in a combined UV-X-ray photoelectron instrument. The valence band and the K 3 p level were studied using 21.2 and 40.8 eV radiation. In the 40.8 eV excited spectrum a structure attributed to surface and volume plasma losses was resolved. Using Al K α excitation the bi…
An extensive experimental study of structure development during the melt spinning of polypropylene and is as-spun polypropylene filaments is reported. Five polymers representing different molecular weights and polymerization methods were studied. WAXS, SAXS, and birefringence measurements were used to characterize the…
This paper presents a review of polycrystalline microwave ferrites with specific reference made to the grain size. Fine-grained ferrites and large-grained ferrites as referred to in this article stand for the ferrites with an average grain size of 2 μm or less and those of 100 μm or larger, respectively. Fine-graining…
An in vivo model is described for assessing the antitumor activity of chemotherapeutic agents. Tumors derived from human colon carcinoma cell lines injected into antithymocyte serum (ATS) immunosuppressed mice were used. In this system, both antitumor effects and host toxicity can be quantitated, permitting calculatio…
Patterns in the plane from Kepler to the present, including recent results and unsolved problems.
Abstract A laboratory continuous mixed‐suspension, mixed‐product‐removal crystallizer was used to study the effects of temperature on the kinetics of crystallization of potassium nitrate. A differential refractometer was used to continuously monitor the supersaturation permitting the measurement of supersaturation lev…
The calcining temperature of the basic magnesium carbonate influences both the reactivity of the resultant MgO and the reaction products in the system MgO‐MgCl 2 ‐H 2 O. The reaction products identified by X‐ray diffraction are: Mg 3 (OH) 3 Cl·4H 2 O (phase 5), Mg 2 (OH) 3 Cl·4H 2 O (phase 3) and Mg(OH) 2 . The presen…
This paper summarizes the results of an examination of the sulfide stress cracking (SSC) susceptibility of selected API and non-API grades of high-strength steels subjected to extensive laboratory and field tests. Introduction High-strength steels commonly used in drilling, completing, and producing' gas and oil wells…
The Young's and shear moduli of polycrystalline monoclinic hafnium oxide were determined by the sonic resonance method at room temperature as a function of volume fraction porosity. The Spriggs equation empirically described the data and the zero porosity moduli as 283.6 GN/m 2 and 109.2 GN/m 2 for Young's and shear m…
The contributions of the Coulomb electrostatic interaction and the Born-Mayer repulsive interaction to the surface energy MgAl2O4 are calculated. These results are compared with the surface-energy values calculated from elastic constants. The results show that surfaces parallel to {111} planes are of lowest energy for…
The effective medium theory is developed for diffusion in random composite media. It is demonstrated that the theoretical diffusivity depends crucially on whether concentration or chemical potential is taken to be the field variable for describing transport.
Physiological properties of mutants of Escherichia coli defective in glyceraldehyde 3-phosphate dehydrogenase, glycerate 3-phosphate kinase, or enolase are described. Introduction of a lesion in any one of the reversible steps catalyzed by these enzymes impaired both the glycolytic and gluconeogenic capabilities of th…
The compatibility, morphology, and mechanical properties of poly-ϵ-caprolactone (PCL) blended with poly(vinyl chloride), nitrocellulose, and cellulose acetate butyrate are described in this study. Methods used in this investigation included differential scanning calorimetry, dynamic mechanical testing, small-angle lig…
The four isomers of hydroxycitrate have been tested as substrates and inhibitors for citrate synthase, citrate lyase, and ATP citrate lyase. None of the isomers served as a substrate for citrate synthase and they were moderate to weak inhibitors of this reaction. Of the four isomers, only (pncit)-(2S)-2-hydroxycitrate…
Valence band X-ray photoelectron spectra of the rutile oxides TiO 2 , RuO 2 , and IrO 2 show a distinct evolution as a function of the increasing number of metal d -electrons. The observations are found to be in excellent agreement with recent theoretical models. Intensity analysis and photo-ionization cross sections…
Journal Article Thermal Analysis of Minerals Get access Thermal Analysis of Minerals. Dumitru N. Todor, translated by Sergiu Marcus. Abacus Press, Tunbridge Wells, Kent, UK, 1976. Distributed by ISBS, Inc., PO Box 555, Forest Grove, OR 97116. 256 pp. Price $32.50. Millard Maienthal Millard Maienthal Division of Drug C…
The article is a review of band-structure calculations for transition metal compounds (carbides and nitrides, layer compounds, A15 structures, and others).
A glass‐forming region was found in the system at a mole ratio ≦3. Glass transition temperatures and conductivities at 25°C for the glasses are, respectively, expressed by where , , and are mole fractions of each component in the glass. These equations show that and are primarily governed by the content. From the resu…