Materials Literature
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Refinement in space group P6 3 /m to an R = 2.02%; confirmed to be isotypic with wadeite (K 2 ZrSi 3 O 9 ). The atomic charges of Si VI , Si IV , O(1) br and O(2) nbr are +3.3, +2.5, -1.4 and -1.4, respectively, and suggest that an increase in the coordination number of a Si atom from 4 to 6 significantly increases th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign, preparation and ESR detection of a ground-state nonet hydrocarbon as a model for one-dimensional organic ferromagnetsYoshio Teki, Takeji Takui, Koichi Itoh, Hiizu Iwamura, and Kazumasa KobayashiCite this: J. Am. Chem. Soc. 1983, 105, 11, 3722–3723Publication Date (Pr…
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A procedure to estimate the standard molar heat capacity, relative enthalpy, and calorimetric entropy of silicate minerals has been devised and evaluated. These are estimated by summing, in appropriate proportions, fictive molar isobaric heat capacities, relative enthalpies, and entropies evaluated for structural comp…
The synthesis and assembly of vimentin was studied in erythroid cells from 10-d-old chicken embryos. After various periods of [35S]methionine incorporation, cells were lysed in a Triton X-100-containing buffer and separated into a soluble and an insoluble (cytoskeletal) fraction. Analysis of these two fractions by two…
Large, hard ZrO 2 agglomerates remained in an Al 2 O 3 /ZrO 2 composite suspension after inefficient ball‐milling. The ZrO 2 agglomerates shrank away from the consolidated Al 2 O 3 /ZrO 2 powder matrix during sintering, producing crack‐like voids which were responsible for strength degradation.
Abstract A series of polypropylene (PP)/nylon 6 (N6) blends of composition 75/25, 50/50, and 25/75 have been prepared in a screw extruder combined with a Koch static mixer. The phase morphology was observed with a scanning electron microscope. The influence of heating in the reservoir of a rheometer followed by subseq…
High-resolution ac calorimetric, x-ray, and light-scattering measurements have been made on $\mathrm{N}\ensuremath{-}[4\ensuremath{-}(n\ensuremath{-}\mathrm{butyloxy})\mathrm{benzylidene}]\ensuremath{-}{4}^{\ensuremath{'}}\ensuremath{-}(n\ensuremath{-}\mathrm{heptyl})\mathrm{aniline}$ (4O.7) near the nematic-smectic-$…
Abstract The activities of thermodynamic components of clay minerals corresponding in composition to pyrophyllite, muscovite, paragonite, and margarite were computed from chemical analyses reported in the literature assuming ideal mixing of atoms on homological sites in the minerals. These activities were then used to…
The nucleotide sequence of two recombinant plasmids containing hamster vimentin cDNA was determined. The sequence comprises 1,640 base pairs and reveals virtually the total primary structure of vimentin and a large part of the 3' noncoding region. Secondary structure prediction methods allow the characterization of tw…
E. Prince Mathematical Techniques in Crystallography and Materials Science. Berlin, Heidelberg, and New York (Springer-Verlag), 1982. viii+ 192 pp., 28 figs. Price DM 55.00 ($25.60). - Volume 47 Issue 343
The unipolar structure that is the steady self-biased hysteresis loop can be created by the electrothermal annealing in the paraelectric phase of pure TGS-crystals grown in the ferroelectric phase. It also occurs in X-irradiated TGS and TGS-Cr. The formation of unipolarity in all these crystals is due to the same spec…
Abstract We describe the syntheses and properties of the new Wurster-type acceptors, 3,7-dihalo-2H,6H-benzo[1,2-b:4,5-b′]dithiophene-2,6-diones (2a) and (2b), which have C2h molecular symmetry with two sulfur atoms, together with the electrical resistivities of their CT complexes.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilization of polyiodide chains: structural influences in the cation as provided by the metal ion and its ligandAlan J. Jircitano and Kristin Bowman MertesCite this: Inorg. Chem. 1983, 22, 12, 1828–1831Publication Date (Print):June 1, 1983Publication History Published onl…
Abstract The thermal degradation of poly(vinylfluoride) (PVF) was studied under slow heating conditions to 1000°C with and without the presence of air. The degradation products, classified as low‐boiling volatiles, high‐boiling volatiles, and nonvolatile residues, were analyzed quantitatively by gas chromatography—mas…
The thermoluminescent (TL) properties of many LiF samples have demonstrated a strong influence on trace impurities and impurity content on the TL process. Hence, the general validity of any particular model must be tested against its applicability in a standard material such as Harshaw LiF (TLD-100). In this paper the…
Investigations have been made of various factors which effect the surface flashover strength across thermoplastic insulators in vacuum. The factors studied, for ac and dc excitation, included the dependence of flashover voltage on specimen length, metallization of the insulator ends, specimen conditioning under dc and…
Abstract Polarized Raman spectra of oriented single crystals of KClO 4 performed over a large temperature range (300–800 K) have been used to investigate the mechanism of the 583 K phase transition. It is shown that the transition can be described using an order parameter and a mechanism based on the reorientation of…
By using the isolobality principle, it is shown that the electronic structures of the 4- through 9-atom organo-transition metal clusters are closely analogous to the corresponding boranes. This parallelism is extended beyond simple structural similarities and is used to account for the high reactivity and nmr fluxiona…
Abstract The kinetics and yields of N ‐trifluoracetylation of polyamides, polyesteramides, polyurethanes were studied by direct titration of trifluoracetic acid formed during the conversion. For polycaprolactam a limiting yield, corresponding to a complete substitution, was always achieved, independently of polymer mo…