Materials Literature
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The bremsstrahlung cross section has been studied by measuring the activity induced in $^{63}\mathrm{Cu}$ by electrodisintegration and when thin radiators of Cu, Mo, Ta, and Th were placed in the electron beam just ahead of the target. The electron energies were varied from 13.5 to 60 MeV for the electrodisintegration…
Natural and synthetic fibres and fabrics have been modified in cold plasma conditions in order to impart new qualities to support materials. Both static and dynamic installations designed to this aim are presented. Improved hydrophilicity, dyeability and flamme retardancy properties were achieved by grafting with eith…
Abstract The anodic oxidation of NH 2 OH on Pt in neutral and acid solutions was studied using CV, RRDE and Mass Spectroscopic Cyclic Voltammetry. Thus, the i /ϕ‐curves obtained could be correlated to the rates of formation of the gaseous products N 2 , N 2 O t NO and NO 2 . Three anodic waves were distinguished, each…
ABSTRACT The initial epivalve of Rhoicosphenia curvata (Kütz.) Grun. differs from vegetative valves in having a strongly arched section, a wide hyaline marginal strip, no pseudosepta, an unthickened margin, and a terminal raphe fissure at the head pole. The initial epivalve is of the D type, with short raphe fissures.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray and neutron diffraction study of [P(CH2C6H5)(C6H5)3]+[HIr4(CO)11]-Robert Bau, Michael Y. Chiang, Chiau Yu Wei, Luigi Garlaschelli, Secondo Martinengo, and Thomas F. KoetzleCite this: Inorg. Chem. 1984, 23, 26, 4758–4762Publication Date (Print):December 1, 1984Publicati…
Abstract Extended x‐ray absorption fine‐structure (EXAFS) measurements were used to determine the near‐neighbor environment of the neutralizing cation in several ionomer system. The observed structure is compared to that existing in analogous low‐molecular‐weight crystalline salts. A wide variety in the degree of loca…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCofacial assembly of partially oxidized metallomacrocycles as an approach to controlling lattice architecture in low-dimensional molecular solids. Synthesis and properties of cofacially joined silicon and germanium hemiporphyrazine polymersCarl W. Dirk and Tobin J. MarksCite…
Abstract Chloroform is decomposed by irradiation with ultrasonic waves to yield a large number of products. The major products are various unsaturated compounds. Decomposition occurs only in the presence of a monoatomic‐ or diatomic gas. Free radicals and carbenes are postulated as intermediates of sonolysis which can…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModel calculations for the intensity parameters of nine-coordinate neodymium(III) and holmium(III) complexes of trigonal symmetryEileen M. Stephens, Michael F. Reid, and F. S. RichardsonCite this: Inorg. Chem. 1984, 23, 26, 4611–4618Publication Date (Print):December 1, 1984P…
The infrared spectra of the (1:1) charge transfer salt of N, N, N′, N ‘-tetramethyl-p-phenylendiamine (TMPD) with 7, 7, 8, 8-tetracyanoquinodimethane (TCNQ) and with fully deuterated TCNQ are reported. The assignment of the vibrational data is obtained on the basis of the comparison with that of neutral and ionized pa…
Abstract The 500 MHz proton NMR spectra of chlorophyll‐ a in several non‐aggregating solvents, at high dilution, are given and that of pheophytin‐ a in CDCl 3 at 360 MHz and at high dilution is reported. Under these conditions, the dispersion is such that separate resonances are observed and can be assigned for all pr…
Abstract The copolymerizations of acrylamide (AM) with N ‐(1,1‐dimethyl‐3‐oxybutyl)acrylamide (DAAM) and with N , N ‐dimethylacrylamide (DMAM) have been studied. The values of r 1 , r 2 have been determined to be 0.75 for the AM‐DAAM pair and 0.86 for the AM‐DMAM pair. The molecular weights of the copolymers were foun…
Copper appears to be a promising anode material for the molten carbonate fuel cell, as an alternative to nickel. Therefore, polarization data have been obtained for oxidation of fuel gases on a fully immersed copper rod. The electrode‐kinetic parameters have been determined using the potential‐step technique. The reac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain-folding initiation structures in ribonuclease A: conformational free energy calculations on Ac-Asn-Pro-Tyr-NHMe, Ac-Tyr-Pro-Asn-NHMe, and related peptidesM. Oka, G. T. Montelione, and H. A. ScheragaCite this: J. Am. Chem. Soc. 1984, 106, 25, 7946–7958Publication Date (…
Raman spectra of an oriented crystal of anhydrous Li2SO4 are reported in the temperature range 25–775 °C which includes the monoclinic-fcc phase transition at 575 °C. Qualitative differences in the general spectra in the two solid phases are discussed. A quantitative analysis has been carried out for the internal ν1 b…
Abstract Thermal behavior of drawn poly(ethylene terephthalate) (PET) multifilament yarn which had earlier been heat‐set at various temperatures between 100°C and 250°C under “free to relax” and “taut at constant length” conditions is studied by differential scanning calorimetric (DSC) measurements. Structural studies…
The dynamic mechanical property of the vitreous body was studied as functions of frequency and temperature. The data at different temperatures were found to be superposable onto a single set of master relaxation curves. It was found that the shape of the composite master relaxation curves of the vitreous body resemble…
Solid-state Si and Al NMR, using high-resolution techniques, have been used to examine the dehydroxylation of the 2:1 phyllosilicate mineral pyrophyllite. Si results are consistent with the maintenance of the 2:1 layer structure in the dehydroxylate phase and provide data on chemical shift/structure variation in sheet…
The crystallization of leucine aminopeptidase from hog kidney is reported for the first time. The crystals which diffract to 4-A resolution have the space group P2(1)2(1)2(1) (a = 186.3 A, b = 223.2 A, and c = 80.5 A) and contain four hexamers per unit cell, or one per asymmetric unit. Electron micrographic images of…
This paper reports an experimental study of a meandering water stream upon an inclined smooth hydrophobic surface. It was found that the sinuosity (ratio of the total stream length to the length of the projection of the stream on the line of maximum slope of the surface) increases with both increasing discharge rate a…