Materials Literature
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Melt blends of polycarbonate and poly(ethylene terephthalate) were formed by continuous extrusion and injection-molded into bars for mechanical testing. Thermal analysis was used to ascertain transitional behavior and the level of PET crystallinity at various points in the fabrication and testing process. The mechanic…
The hydrophilic, sulfated fraction of the organic matrix found in molluscan shells appears to be involved in crystal nucleation. It is located primarily at the sites of initial nucleation. The hydrophilic fraction favors in vitro formation of calcified deposits, when it is fixed in place on the hydrophobic fraction. C…
Recently a simple hexagonal phase of Si has been discovered at \ensuremath{\sim}130-160 kbar of pressure. We have performed self-consistent density-functional calculations on the $\ensuremath{\beta}$-tin and simple hexagonal structures of Si, using the calculated stress tensor to determine the $\frac{c}{a}$ ratios as…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmbient-pressure superconductivity at 2.7 K and higher temperatures in derivatives of (BEDT-TTF)2IBr2: synthesis, structure, and detection of superconductivityJack M. Williams, Hau H. Wang, Mark A. Beno, Thomas J. Emge, L. M. Sowa, P. T. Copps, F. Behroozi, L. N. Hall, K. Do…
Article A systematic net description of saddle polyhedra and periodic minimal surfaces was published on November 1, 1984 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 168, issue 1-4).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectra of Co(NH3)6X3 (X = Cl, Br, I) complexesLucjan Dubicki and Bryce WilliamsonCite this: Inorg. Chem. 1984, 23, 23, 3779–3784Publication Date (Print):November 1, 1984Publication History Published online1 May 2002Published inissue 1 November 1984https://pubs.acs.org…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent-induced cocrystallization of the α (threefold helical) and β (extended) structures of isotactic polystyrene: determination of x-ray crystallinity and disorder parameterNancy J. Tyrer, Terry L. Bluhm, and Pudupadi R. SundararajanCite this: Macromolecules 1984, 17, 11,…
The ferromagnetic properties of recently developed amorphous metal alloys present an opportunity to significantly reduce the excitation losses of distribution transformers. Losses of these materials are on the order of 25% to 35% of conventional electrical steels at equivalent inductions. Before the benefits of this a…
Abstract Volume of loose media was determined accurately by a devised mechanical method and used for bulk density (BD) calculations. BD associated with increasing percentages of pine bark and/or sand potting media were plotted. Linear increase in BD associated with increasing percentage of sand in the medium was used…
Through original, peer-reviewed articles, JBCR provides the latest information on advances in burn prevention, research, education, delivery of acute care, and research to all members of the burn care team.
Transmission measurements on ${\mathrm{Gd}}_{2}$ ${(\mathrm{M}\mathrm{o}{\mathrm{O}}_{4})}_{3}$ in the (5-50)-${\mathrm{cm}}^{\ensuremath{-}1}$ region were performed with use of tunable backward-wave oscillator sources (5-30 ${\mathrm{cm}}^{\ensuremath{-}1}$) and a Fourier spectrometer (30-50 ${\mathrm{cm}}^{\ensurema…
Abstract Several iron(III) complexes with planar unsymmetrical quadridentate Schiff bases composed of 1:1:1 condensation products of acetylacetone, ethylenediamine, and each of salicylaldehyde and o-hydroxyacetophenone have been prepared and characterized, where the Schiff bases are abbreviated as [H2salacen] and [H2h…
Abstract A series of response equations relating dispersion and rubber properties to mixing and compounding variables have been developed for formulations based on SBR and EPDM. These provide insight on the relationship of dispersion to rubber performance as carbon black type and loading are widely varied. Optimum con…
Abstract A method for the syntheses of α,ω‐dibenzyl aromatic poly(ether sulfone)s (PSU) and poly(oxy‐2,6‐dimethyl‐1,4‐phenylene) (POP) containing pendant vinyl groups is presented. The first step of the synthetic procedure involves the chloromethylation of PSU and POP to provide polymers with chloromethyl groups. POP,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFast infrared detection of pentacarbonyldinitrogenchromium (Cr(CO)5N2) in room-temperature solutionStephen P. Church, Friedrich Wilhelm Grevels, Horst Hermann, and Kurt SchaffnerCite this: Inorg. Chem. 1984, 23, 23, 3830–3833Publication Date (Print):November 1, 1984Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational study of the dynamics of n-decylammonium chains in the perovskite-type layer compound decylammonium tetrachlorocadmate ((C10H21NH3)2CdCl4)L. Ricard, M. Rey-Lafon, and C. BiranCite this: J. Phys. Chem. 1984, 88, 23, 5614–5620Publication Date (Print):November 1, 19…
Evidence is reported of 1020 cm−3 hydroxyl impurity density affecting crystal fields and color center formations in YAG and Nd:YAG. Also reported is a high-temperature reactive atmosphere process to control H bonding and to bleach coloration. Absorption by O–H⋅⋅⋅O and O–D⋅⋅⋅O transitions in the 3–4 μm spectral region…
The atremate brachiopods are unique in that they possess shells of calcium phosphate. In Lingula adamsi and Gloltidia pyramidata, the shell mineral is (CO3 + F)-containing apatite and is crystallo-chemically similar but not identical to the mineral francolite. The shell of Glottidia consists of a thin periostracum, a…
We have implemented group-theoretical methods on the computer for the description of possible structural phase transitions. All isotropy groups (corresponding to $\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}$ points of symmetry) for each of the 230 three-dimensional space groups as well as the Landau and Lifshitz c…
The fine structure of a surface defect on GaAs grown by molecular beam epitaxy (MBE) is analyzed by transmission electron microscopy (TEM) observing cross-sectional views of the specimen. The defect has a pyramid structure consisting of four {111} stacking fault planes whose Burgers vectors are a 0 /6 <112>, a 0…