Materials Literature
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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.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical reduction of an isomeric pair when the products interconvertAlan M. Bond and Keith B. OldhamCite this: J. Phys. Chem. 1983, 87, 14, 2492–2502Publication Date (Print):July 1, 1983Publication History Published online1 May 2002Published inissue 1 July 1983https:…
Abstract The solvent influence on two‐ phase structures resulting from drying films of segmented polyetherurethanes of different hard segment contents and molecular weights was investigated by infrared dichroism measurements of the orientational behaviour of the hard segments. A low density of physical crosslinking an…
The effect of an external magnetic field on the orientational order of a nematic liquid crystal has been examined using both Landau-de Gennes and Maier-Saupe theories. In the Maier-Saupe approach a rotationally invariant form of the pseudo-potential is introduced, which in the absence of an external field leads to thr…
Abstract Excitation and emission spectra for CaS:Ce 3+ and CaSe:Ce 3+ phosphors are measured at 6, 80, and 300 K. The vibrational structure on the emission bands 2 T 2g → 2 F 5/2 , 2 F 7/2 and the excitation band 2 F 5/2 → 2 T 2g is analysed by the use of energy matrices in order to determine the coupling constant of…
The planarization properties or thickness changes on topographical features are examined in detail for several types of spun‐on polymer films. A profilometer is used to measure the step height changes of isolated line features of various dimensions. The viscosity of the solution appears to give a reasonable indication…