Materials Literature
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Six freshly enucleated, unfixed human eyes with choroidal melanomas were imaged on a 1.4-T superconducting magnetic resonance (MR) imaging system. Immediately thereafter the eyes were sectioned, and tumor samples were removed for study on a variable-field (0.19-1.4 T) nuclear MR spectroscopy unit. Shorter T1 and T2 re…
The metC gene of Escherichia coli K-12 was cloned and the nucleotide sequence of the metC gene and its flanking regions was determined. The translation initiation codon was identified by sequencing the NH2-terminal part of beta-cystathionase, the MetC gene product. The metC gene (1185 nucleotides) encodes a protein ha…
Summary Casing wear caused by new tooljoint hardfacings, such as fine-mesh tungsten-carbide hardfacing and a hardfacing covered with a layer of relatively soft material, has been investigated in the laboratory. The tests were performed on a full-scale test facility with field conditions—forces, motions, and fluids—sim…
Apparatus is described for study of diffuse-reflection spectra (DRS) and luminescence spectra (LS) in the wavelength range of 0.2-2.2 ..mu..m of solids in the initial state and during irradiation by light by electrons with energies up to 150 keV, and by H/sup +/, H/sub 2//sup +/, and H/sub 3//sup +/ ions with energies…
Abstract The thermal degradation of poly(vinyl bromide) (PVB), poly(vinyl chloride) (PVC), poly(vinyl alcohol) (PVA), poly(vinyl acetate) (PVAc), poly(vinyl fluoride) (PVF), poly(vinylidene chloride) (PVC 2 ), and poly(vinylidene fluoride) (PVF 2 ) has been studied by direct pyrolysis–mass spectrometry (DP‐MS) and fla…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal poly(benzodithiolenes)C. W. Dirk, M. Bousseau, P. H. Barrett, F. Moraes, F. Wudl, and A. J. HeegerCite this: Macromolecules 1986, 19, 2, 266–269Publication Date (Print):February 1, 1986Publication History Published online1 May 2002Published inissue 1 February 1986https…
A method to represent the effect of ionized impurity scattering in Monte Carlo calculations is presented. It is based on a model of B. K. Ridley [J. Phys. C 10, 1589 (1977)] and does not have the computational disadvantages of the Brooks–Herring and Conwell–Weisskopf models.
Abstract Sequential cation-exchange capacity (CEC) measurements were obtained from standard clays using a mechanized, variable-rate leaching device. The device consists of a motorized screwjack and as many as 24 leaching tubes coupled to 60-ml plastic syringes. Controlled withdrawal of the syringe plungers produces a…
This paper discusses the resonance raman-spectra of alpha-copper phthalocyanine.
Upper and lower reciprocal variational principles have been used to estimate the effective conductivity (or diflusivity)across beds of randomly dispersed fibers with orientations distributed in two and three dimensions. Estimated thermal conductivities of fiber glass insulation, graphite-epoxy fiber reinforced composi…
The Raman spectrum of kaolinite #9, a layer silicate of composition Al 2 Si 2 O 5 (OH) 4 from Mesa Alta, New Mexico, USA, is reported and compared to previously published Raman and infrared spectra, as well as calculated lattice vibration frequencies, of other kaolinite samples. In the OH stretching region, a Raman ba…
The Voigt function is now recognized to be one of the best mathematical descriptions of the symmetrical component of the peak shape in constant-wavelength X-ray and neutron powder diffraction. The simpler pseudo-Voigt function has been used previously to provide an empirical fit to observed peak shapes. In this paper,…
Abstract A cell model describing the diffusion‐induced growth of closely spaced single bubbles developed in an earlier publication is now used as the microscopic building block of an analysis of low‐pressure structural foam molding. Heat transfer, solidification, and bulk flow of the foam in the mold cavity are includ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLayered double hydroxides as supported anionic reagents. Halide-ion reactivity in zinc chromium hexahydroxide halide hydrates [Zn2Cr(OH)6X.nH2O] (X = Cl, I)Kevin J. Martin and T. J. PinnavaiaCite this: J. Am. Chem. Soc. 1986, 108, 3, 541–542Publication Date (Print):February…
Abstract The crystal structure of natural mordenite from Elba (Italy) with chemical formula (Na 1.49 K 2.80 Mg 0.04 Ca 2.05 Sr 0.05 )(Al 8.98 Si 39.13 )O 96 · 29.07 H 2 O was refined in its hydrated form up to a wR value of 5.2%. Systematic absences were consistent with the Cmcm space group but the asymmetry of the ex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical studies of transition-metal hydrides. 1. Bond energies for MH+ with M = Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and ZnJ. Bruce. Schilling, William A. Goddard, and J. L. BeauchampCite this: J. Am. Chem. Soc. 1986, 108, 4, 582–584Publication Date (Print):February 1,…
Applications of state-of-the-art image analysis techniques to measuring cotton (Gos sypium sp.) fiber maturity are reported. Individual cotton fibers arrayed longitudinally on microscope slides are optically scanned by the image analyzer. The fiber's video image is automatically broken into narrow bands for discreet m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLocal structure and the mechanism of response to elastic deformation in a glassy polymerDoros N. Theodorou and Ulrich W. SuterCite this: Macromolecules 1986, 19, 2, 379–387Publication Date (Print):February 1, 1986Publication History Published online1 May 2002Published inissu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelations between chain parameters and the plateau modulus of polymersShaul M. AharoniCite this: Macromolecules 1986, 19, 2, 426–434Publication Date (Print):February 1, 1986Publication History Published online1 May 2002Published inissue 1 February 1986https://pubs.acs.org…
We formulate a theory for the nonequilibrium structure and stresses in a sheared suspension with a fluid rest state. Many body interactions are handled exactly in the thermodynamics but truncated at the pair level for the hydrodynamics. Evaluation for hard spheres in weak flows demonstrates the importance of stresses…