Materials Literature
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A series of cardanol derivatives prepared in a preceding study1 are evaluated as PVC plasticizers. These include butyl anacardate (3), cyclohexyl anacardate (4), 3-(pentadec-8′-enyl)phenyl acetate (5), 3-(8′,9′-diacetoxypentadecyl)phenyl acetate (6), and 3-(8′-epoxypentadecyl)phenyl acetate (7). The evaluation initial…
The optical transmission of Ti4O7 single crystals has been measured in the infrared at wavelengths between 3·8 and 6·8 μ in the temperature range of the metal-insulator transitions. In the low temperature phase (T>140K), the data are characteristic of a semiconductor with an optical gap of ∼ 0·25 eV. In both the inter…
Abstract The processes of the solid state reaction of Y2O3 with WO3 were studied for samples mixed in the molar ratios of Y2O3 : WO3=1 : 3, 1 : 1, 7 : 4, 5 : 2, and 3 : 1. It was found that all the reactions except Y2O3 : WO3= 5 : 2 from the powders of both Y2O3 and WO3 in air proceeded according to the following orde…
Binding energies for the core levels of scandium metal and its oxide and hydride are recorded. Plasmon energy-loss peaks are observed for the metal and show a large shift on hydriding, approximately 3.7 eV, compared with a shift of approximately 0.2 eV for the 2p core levels. The large plasmon shift is consistent with…
In Bacillus subtilis the trpX locus specifies a glutamine-binding protein designated subunit X, which forms a complex with subunit E to constitute the anthranilate synthase enzyme aggregate (EX) and subunit A to constitute the p-aminobenzoate synthase enzyme aggregate (AX). Subunit X confers upon these enzyme complexe…
A theory is described which, for any universal structure invariant or structure seminvariant, Φ, is able to arrange the set of reflexions in shells, each shell a subset of the succeeding one, with the property that Φ may be estimated in terms of the magnitudes constituting any shell. The theory uses the idea that numb…
Abstract Polymerization of sarcosine N ‐carboxyanhydride was carried out in N , N ‐dimethylformamide solution with some primary and secondary amines as initiators. The polymerization obeyed the first‐order kinetics. Polysarcosines obtained were fractionated by gel‐chromatography. For lower oligomers, individual oligom…
This is the first of three presentations conceived to improve the operator's understanding of the process of pipe protection by calcium carbonate precipitation.
The crystal structure of Mn/sub 3/(Co(CN)/sub 6/)/sub 2/.12H/sub 2/O has been determined by neutron and x-ray diffraction methods and that of Cd/sub 3/(Co(CN)/sub 6/)/sub 2/.12H/sub 2/O by the latter method. In both cases, the space group is Fm3M with lattice constants of 10.436 (3) and 10.600 (3) A, respectively. The…
Abstract Einkristalluntersuchungen zufolge leitet sich die Kristallstruktur von Na 3 NO 3 ≙ (NO )ONa 3 + vom anti‐Perowskittyp ab (a = 4,605 Å, Pm3m); das Nitrit‐Anion ist fehlgeordnet.
The general energy analysis of fabric mechanics by means of optimal control presented in a previous publication is applied to the woven-fabric structure for deformations whereby the yarns remain in the same plane. The three-dimensional equations of the general theory are reduced to two-dimensional form, the boundary c…
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…