Materials Literature
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Abstract The description of electron density in solids by quantum theory and by x‐ray diffraction experiments should closely coincide. A formalism for describing the electronic structure of single crystals in terms of a density matrix is presented. Iterative equations for calculating the density matrix in a basis of B…
Orthorhombic α‐KFeSiO 4 ( a =0.5478, b =0.9192, c =0.8580 nm), hexagonal β‐KFeSiO 4 ( a =0.5309, c =0.8873 nm), and hexagonal γ‐KFeSiO 4 ( a =0.5319, c =0.8815 nm) were synthesized by devitrification of KFeSiO 4 glass. Powder X‐ray diffraction data are given for all three polymorphs. Alpha KFeSiO 4 , the high‐temperat…
Subsolidus equilibrium relations were reexamined in the SnO 2 ‐rich portion of the system GeO 2 ‐SnO 2 (60 to 98 mol% SnO 2 ). A limited solid solution based on SnO 2 was confirmed; 4mol% GeO 2 dissolved in SnO 2 at 1250 C, and glass was formed on quenching over the compositional range above 4mol% GeO 2 . Phase reluti…
Abstract not Available.
Abstract Three soil profiles containing two types of brittle horizons were extracted using citrate‐hicarbonate‐dithionite (CBD), a modified CBD, and NaOH procedures. The modified CBD method with a low soil‐solution ratio was the most effective extractant for Fe, Al, and, especially, Si. Increases in extractable Si cou…
Abstract The percentage contents of oil and protein in the seeds of Calotropis gigantea Linn. (Asclepiadaceae), Acacia caesia Willd., syn. A. intsia (Leguminosae) and Abelmoschus ficulneus Wight & Arm., syn. Hibiscus ficulneus Linn. (Malvaceae) were 30.8, 8.8 and 14.4, and 19.0, 11.7 and 20.0, respectively. The ma…
Above 755°C, compounds along the spinel join LiFe 5 O 8 ‐Li 4 Ti 5 O 12 form a complete solid solution and below that temperature a two‐phase region separates the ordered LiFe 5 O 8 and the disordered spinel phase. At 800° and 900°C, cubic LiFeO 2 ( ss ) and monoclinic Li z Ti0 3 ( ss ) exist on the monoxide join LiFe…
Abstract Novel poly(ether urethanes) were synthesized by homo‐ and random copolymerization of the m ‐ and p ‐hydroxyethoxy benzoyl azides. Polymerization proceeded by decomposition and rearrangement of the acid azide group to the isocyanate group, which immediately reacted intermolecularly with the hydroxyl group to p…
Abstract Individual marks are located adjacent to machine-cut ends on garbage bags and sandwich bags. Class marks that change direction or width or both are present on many brands. The cut ends of plastic bags can successfully be related to each other. Visits were made to plants that manufacture both types of bags to…
The neutron total cross section of $^{30}\mathrm{Si}$ + n was measured from 0.2 to 1400 keV and the data were analyzed to obtain resonance parameters. Two $s$-wave resonances corresponding to ${\mathrm{\textonehalf{}}}^{+}$ states in $^{31}\mathrm{Si}$ predicted from shell model calculations were found. Contrary to ea…
The room temperature ferromagnetic resonance (FMR) absorption at 8.9–11.2 GHz in two planar hexagonal ferrites, Zn2Y and MnZnY, has been found to exhibit strong nonlinear behavior at low power levels corresponding to microwave field amplitudes on the order of 10 mOe. For somewhat larger amplitudes, 20–50 mOe, the asym…
Although the a.c. conductivity of amorphous chalcogenides in the radio frequency region has been well interpreted by the combined mechanism of correlated barrier hopping (CBH) of bipolarons and single polarons based on charged defects, it is not clear whether the CBH model can be extended to the microwave region. The…
The Ar ion beam etching (IBE) of InP has been studied in orded to clarify its applicability as a microfabrication technique for devices with submicron geometry such as integrated optics devices. The IBE rate has been determined as a function of ion energy, current density and angle of beam incidence. The crystalline q…
Continuum mechanics has been used to work out the structure and properties of disclinations in nematic and cholesteric liquid crystals. After a brief review of the earlier works on the energetics of disclinations in the one constant approximation, we consider the effect of elastic anisotropy. Elastic anisotropy not on…
Abstract The nature and stability of surface species of CuCl 2 supported on α‐Al 2 O 3 , γ‐Al 2 O 3 , and SiO 2 were investigated by using X‐ray diffraction techniques and reflectance spectroscopy. No specific chemical interaction of CuCl 2 is observed on an inert α‐Al 2 O 3 support, as opposed to hydrated carriers as…
Abstract ULTEM® polyetherimide resin is characterized by a combination of high performance mechanical, thermal, flammability, and electrical properties. The exceptional mechanical properties are typified by a 15,000 psi tensile strength and 480,000 psi flexural modulus. Because of its amorphous structure and outstandi…
Previous work has shown that native lysozyme (N) is completely denatured by the addition of guanidinium chloride (conformation D) but that partially denatured conformations appear in other denaturants. Conformation I appears when LiClO4 is added to the protein, and conformation II is caused by heating. We have now det…
Abstract Basische Aluminiumchloridlösungen wurden aus Lösungen des neutralen Salzes durch Zugabe von Lauge bzw. Auflösen von metallischem Aluminium hergestellt. Ihre Untersuchung mit der Ferronmethode und der 27 Al‐Kernresonanz ergab in den Lösungen beider Darstellungsarten monomere, tridekamere und polymere Aluminium…
Citrate synthase was purified to homogeneity from a Gram-positive bacterium (Bacillus megaterium) for the first time. The Mr of the native enzyme was determined to be 84 000 (S.E.M. +/- 5000). Sodium dodecyl sulphate/polyacrylamide-gel electrophoresis and gel filtration in guanidinium chloride revealed a single protei…
We examine two heat transfer and phase change problems having explicit solutions. The first involves melting of an initially cold material and clarifies the meaning of a recent result of Tarzia [5]. The second concerns a model of binary alloy solidification which, in some cases, is seen to be incorrect.