Materials Literature
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Carbon-14 data on atmospheric CO2 as well as on plant material (tree leaves and wheat) from the vicinity of two German boiling water reactors (Philippsburg and Isar/Ohu) are reported. Atmospheric CO2 samples taken routinely with an integration time of one or two weeks 1.75 km downwind of the Philippsburg reactor (900…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR study of manganese(II) in two crystalline forms of bis(2,2'-bi-2-thiazoline)bis(thiocyanato)iron and the high-spin-low-spin transition that occurs in only one form. X-ray structure determination of both formsAndrzej Ozarowski, Bruce R. McGarvey, Anil B. Sarkar, and John…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-resolution silicon-29 nuclear magnetic resonance in the Y-Si-O-N systemR. Dupree, M. H. Lewis, and M. E. SmithCite this: J. Am. Chem. Soc. 1988, 110, 4, 1083–1087Publication Date (Print):February 17, 1988Publication History Published online1 May 2002Published inissue 17…
The sp2 sites present in the various forms of amorphous carbon have been shown to form aromatic clusters whose size determines the width of the local band gap. A fluctuating band-edge model is developed to describe the effects of this clustering on the localization of states around the gap. It is shown how localized s…
In a posterior silk gland extract, covalently closed circular (ccc) DNA is in a superhelical state that supports more transcription of fibroin gene than does linear DNA. A HeLa cell extract showed neither the supercoiling activity nor the preference for the transcription of ccc DNA over linear DNA. These activities co…
Abstract This paper discusses the effect of varying cooling rates during crystallization on the spherulitic structure of poly(butalene terephthalate). Light microscopy, transmission electron microscopy, and differential scanning calorimetry were used to examine specimens. The mechanical properties of the polymers stud…
Abstract The effects of systematically varying the crosslink density on the mechanical relaxations in the glassy region of typical highly crosslinked diepoxide‐diamine polymers are reported. Activation enthalpies and intensities for the β relaxation have been measured using a torsion pendulum at 1 Hz. The glyceryl gro…
The drag coefficient CD=48/R for a spherical bubble in a uniform streaming flow at high Reynolds number, which was first obtained via a dissipation method by Levich [Zh. Eksp. Teor. Fiz. 19, 18 (1949)], is rederived here by direct integration of the normal stress over the bubble surface. The present study also shows t…
We report the temperature dependence of the electrical resistivity of carbon at atmospheric pressure and temperatures up to and above the melting point at 4450\ifmmode\pm\else\textpm\fi{}100 K. Vapor-grown graphite fibers of different crystalline perfection were heated with 28-\ensuremath{\mu}sec electrical pulses. We…
Abstract Platinum particles were prepared by reducing the hydrogen hexachloroplatinate extracted in organic solvents from an aqueous solution by these extractants:dioctadecyldimethylammonium chloride(DDAC), trioctylmethylammonium chloride(TMAC), and trioctylphosphine oxide(TOPO). The extraction ratio of platinum(IV) i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental study and kinetic modeling of propene oxidation in a jet stirred flow reactorP. Dagaut, M. Cathonnet, and J. C. BoettnerCite this: J. Phys. Chem. 1988, 92, 3, 661–671Publication Date (Print):February 1, 1988Publication History Published online1 May 2002Published…
Abstract Using the concept of filler coating, a study has been made of the morphology and mechanical properties of polypropylene/talc/elastomer composites with a series of polar components as added elastomers. Both impact strength and stiffness of the blends were better than those of polypropylene homopolymer. Most of…
Metallographic and fractographic observations of crack growth in pure magnesium in dry air, aqueous, and liquid alkali metal environments are described. Crack growth in dry air at ambient temperatures was macroscopically brittle and occurred parallel to {101¯ X} planes or along grain boundaries, but fracture surfaces…
A historical cohort mortality study was conducted among 6,781 white male employees from a nuclear weapons materials fabrication plant for the years 1947-1979. Exposures of greatest concern are alpha and gamma radiation emanating primarily from insoluble uranium compounds. Among monitored workers, the mean cumulative a…
We present x-ray diffraction measurements of freely suspended single-orientation columnar-phase strands of 2,3,7,8,12,13-hexa(-n-tetradecanoyloxy)truxene [(${\mathrm{C}}_{13}$${\mathrm{H}}_{27}$COO${)}_{6}$-TX] which show a dramatic difference between the ordering of the rigid, planar central cores and the flexible hy…
A field isolate of Desulfovibrio desulfuricans was grown in defined medium in a two-stage continuous culture apparatus with different concentrations of phosphate in the feed medium. The first state (V1) was operated as a conventional chemostat (D = 0.045 h) that was limited in energy source (lactate) or phosphate. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology control of binary polymer mixtures by spinodal decomposition and crystallization. 2. Further studies on PP/EPRNobuyuki Inaba, Takeshi Yamada, Shyunichi Suzuki, and Takeji HashimotoCite this: Macromolecules 1988, 21, 2, 407–414Publication Date (Print):February 1, 1…
Several addition compounds of the amino acid betaine and inorganic acids were found in the last years to possess structural, ferroelastic, ferroelectric or antiferroelectric phase transitions. As well commensurate as incommensurate phases are observed. The materials are betaine phosphate (antiferroelectric), betaine a…
<div class="htmlview paragraph">A transient three-dimensional model has been developed to simulate the thermal and conversion characteristics of nonadiabatic monolithic converters operating under flow maldistribution conditions. The model accounts for convective heat and mass transport, gas-solid heat and mass t…
A shear‐lag analysis is presented for estimating sliding friction stress at fiber‐matrix interfaces in ceramic‐matrix composites using the single‐fiber push‐out test. The analysis includes an approximate correction for the increased interfacial compression and, therefore, the interfacial friction stress arising from t…