Materials Literature
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Abstract The crystallization and thermal behaviour of crystallizable random propene/ethene copolymers (P‐ co ‐E) was systematically investigated. Index of crystallinity and, index of γ‐form, enthalpy and entropy of fusion, equilibrium melting temperature, spherulite growth rate, and overall kinetic rate constant were…
The high strength of some Al–Cu–Mg–Ag alloys has been attributed to very thin (~2·5 nm), but broad, hexagonal-shaped precipitates. Previous work has shown that the precipitates have a hexagonal unit cell, but different lattice parameters have been reported. In the present paper, the intensities of X-ray diffraction re…
The skin of the Norfolk spot, Leiostomus xanthurus, is composed largely of a crossed-helical array of collagen fibers. Over most of the body of the fish these are oriented at angles of 45-80° with the long axis of the fish. The skin of the skipjack tuna, Katsuwonus pelamis, also contains a crossed-helical array of col…
Most of the technologically important transducers are made of poled-polycrystalline lead zirconate--lead titanate Pb(Zr,Ti)${\mathrm{O}}_{3}$ compositions near the morphotropic phase boundary where the [Zr]:[Ti] ratio is approximately 1:1. The effect of elastic boundary conditions on single-domain stability and proper…
The nematic-isotropic phase transition of long flexible polymers using mean-field theory with the Maier-Saupe expression of the van der Waals interaction are described. The order parameter of nematic polymers is calculated as a function of reduced temperature, k B/T (a epsilon ) 1/2 , where a is the quadrupolar mean-f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures and magnetic properties of .mu.-phenolato copper(II) binuclear complexes with hydroxo, azido, and cyanato-O exogenous bridgesTalal Mallah, Marie Laure Boillot, Olivier Kahn, Jacqueline Gouteron, Suzanne Jeannin, and Yves JeanninCite this: Inorg. Chem. 1986…
Abstract X-ray powder diffraction (XRD) studies of the clay fraction of Upper Cretaceous mudstones from a shallow (2.5 km) drill hole in the Niger delta indicate a high geothermal gradient (about 100°C/km) during diagenesis. The mineralogy of the clays is similar to that observed elsewhere and consists of interstratif…
Ionic conductivity data of yttria stabilized zirconia, , reported in the literature as functions of oxygen vacancy concentration, , and temperature, , have been analyzed according to a theoretical model developed in a previous paper (Paper 1) and applied to calcia stabilized zirconia. Because of the different charge c…
Abstract The 001 spacing of Na-smectite was found to vary from 9.6 Å at 0% relative humidity (RH) to 12.4 Å at 60-65% RH. The 9.6-Å spacing corresponds to dehydrated Na-smectite, and the 12.4-Å corresponds to Na-smectite with one water layer. A regular series of intermediate values resulted from ordered interstratific…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA binuclear iron peroxide complex capable of olefin epoxidationBruce P. Murch, Fontaine C. Bradley, and Lawrence. QueCite this: J. Am. Chem. Soc. 1986, 108, 16, 5027–5028Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissue 1…
▪ Abstract The phase-field method has recently emerged as a powerful computational approach to modeling and predicting mesoscale morphological and microstructure evolution in materials. It describes a microstructure using a set of conserved and ...Read More
▪ Abstract The phase-field method has recently emerged as a powerful computational approach to modeling and predicting mesoscale morphological and microstructure evolution in materials. It describes a microstructure using a set of conserved and ...Read More
In the electron-energy-loss or x-ray-absorption spectra of the 3d transition metals the onset of the ${L}_{2}$,3 edge (2p excitation) is marked by two sharp peaks often called white lines. The peaks are attributed to the excitation of the 2${p}_{3/2}$ and 2${p}_{1/2}$ subshells to unoccupied d levels but the observed…
A 3240-base-pair DNA fragment spanning the pyridine nucleotide transhydrogenase (pnt) genes of Escherichia coli has been sequenced. The sequence contains two open-reading frames, pntA and pntB of 1506 and 1386 base pairs, coding for the transhydrogenase alpha and beta subunits, respectively. The coding sequences are p…
Photoelectrochemical investigations were performed with passivated titanium electrodes. Passive films were formed in at constant potential, , with being varied between 4 and 105V. The results of photocurrent spectra and the potential dependence of the photocurrent suggest a distinction of four different types of film…
Abstract Chemical analysis by X-ray fluorescence (XRF) and calculated structural formulae of clay-size fractions of smectites from Cretaceous bentonites and illitic clays from Cretaceous, Devonian, and Ordovician bentonites and Jurassic and Permian sandstones indicate the nature and extent of various types of ionic su…
Bis 1.3 K kontinuierlich ansteigende, metallische Leitfähigkeit, die über 500 000 S cm−1 erreicht, zeigen durch Elektrokristallisation gewonnene Einkristalle des nebenstehenden Radikalanionen-Salzes. Die mehrdimensionale Elektronenleitung wird anhand der Kristallstruktur diskutiert. Die Cu1-Ionen sind als Ketten aufge…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic chromatographic systems for the determination of rare earths and thorium in samples from uranium ore refining processesD. J. Barkley, Marcia. Blanchette, R. M. Cassidy, and Steve. ElchukCite this: Anal. Chem. 1986, 58, 11, 2222–2226Publication Date (Print):August 1,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign and synthesis of a new ferroelectric liquid crystal family. Liquid crystals containing a nonracemic 2-alkoxy-1-propoxy unitDavid M. Walba, Stacey C. Slater, William N. Thurmes, Noel A. Clark, Mark A. Handschy, and Frank. SuponCite this: J. Am. Chem. Soc. 1986, 108, 17…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDigestion of biological materials for mineral analyses using a combination of wet and dry ashingA. D. Hill, K. Y. Patterson, C. Veillon, and E. R. MorrisCite this: Anal. Chem. 1986, 58, 11, 2340–2342Publication Date (Print):August 1, 1986Publication History Published online1…