Materials Literature
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The diffusion of hydrogen and deuterium in commercially pure iron specimens variously deformed and annealed has been investigated between 283 K and 318 K by an electrochemical permeation method. The temperature dependence of the diffusion coefficients of hydrogen (DH) and deuterium (DD) is discussed on the basis of th…
Some recent observations of defects in main-chain nematic and chiral polymers are reviewed in order to obtain a better understanding of the nature of molecular configurations. Important parameters are (a) the chain length, the density of free ends and the length of flexible spacers and (b) the orientational correlatio…
This book presents papers summarizing design, use, application, and operation of gas-insulated substations. Subjects covered include economics of GIS, specification of GIS, design, site testing, design and type testing, diagnostics, experience, maintenance, medium high voltage GIS, and new concepts and future trends.
SummaryMagnesium alloy diecasting AZ91CC,* AZ61CC, AZ91HC* and AZ71HC were electroplated using three proprietary pretreatment sequences which incorporated conventional zincate immersion processes. Satisfactory peel adhesion in excess of 7.7KNm−1 was achieved on AZ61CC using a sequence designated “WCM” which used the s…
Abstract A review is given first on Lichtenberg figures on dielectrics in gases. The problem of Lichtenberg figures at low gas pressures ( p <1 Pa) is raised. Experiments are reported about the latter. The results are discussed by the help of models of vacuum flashover on dielectrics.
The release of melatonin, estradiol, and flourogestone acetate from subdermal implants was enhanced when implants were fabricated from silicone elastomers containing co-solvents. This enhancement followed a Q vs. t relationship. As glycerol concentration increased, the increments in release rate were greater for hydro…
A three-dimensional mathematical model was developed for calculating Joule heat release, glass flow, and heat transfer in electric glass furnaces. The model developed here allows for multiple electrodes, multiphase firing, and the feeding and withdrawal of molten glass. The model is fairly general with respect to the…
Sea water corrosion tests of five copper alloy heat exchanger materials were undertaken to examine the effects of sulphide, commonly present as a pollutant in sea water, on their corrosion behaviour, particularly in the presence of chlorine. Corrosion, particularly impingement attack, increased with increasing sulphid…
Swelling data are now available for 15 iron-nickel-chromium ternary alloys irradiated to exposures as high as 110 displacements per atom (dpa) in Experimental Breeder Reactor-II (EBR-II) between 400 and 650°C. These data confirm trends observed at lower exposure levels and extend the generality of earlier conclusions…
The oxidation of 2, 5-diphenylfuran (1) with (hexamethylphosphoramide) oxodiperoxomolybdenum (VI), MoO5·HMPA, gave cis-1, 4-diphenyl-2-butene-1, 4-dione (2) and its cis-epoxide 3.2, 3-Diphenylpyrrole (4) was similarly treated with MoO5·HMPA to give the dimeric product 6, together with the cis-epoxide 3 and the trans-o…
Integral representations of integrals and derivatives with respect to the order of the Bessel functions Jv(t) Iv(t), the integral Bessel function Jiv(t) and the Anger function Jv(t) are presented. The Laplace transform technique is applied to derive them. The integral representations permit the evaluation of a number…
The viscoelastic properties of dry, normal, and glycerol-treated skin of the lower leg have been measured with a gas-bearing electrodynamometer (GBE). Elastic modulus measurements are shown to correlate well with visual assessment of the skin condition by a trained dermatological grader. Dry skin is generally stiffer…
The crystal and molecular structure of the mesogenic title compound (HBA) is described. Lattice parameters are: space group P1, a = 9.003(2) Å, b = 8.850(2) Å, c = 8.510(2) Å, α = 79.63(1)°, β = 65.04(1)°, γ = 87.41(1)° (at T = 299 K). The molecules contain a centre of symmetry and the phenyl rings are coplanar. In or…
The black compounds M[OsO4](M = Na, K, Rb, or Cs) have been prepared from OsO4 and MI in acetone. They are stable in dry air, but disproportionate immediately in aqueous acid solution to OsVIII and OsIV, and in basic solution to OsVIII and OsVI The i.r. and electronic spectra are reported and discussed. X-Ray powder d…
The dew points of phosphorus vapor over Sn–P alloys containing 45 mol%P or less have been determined at temperatures ranging from 703 to 973 K. The dew consisting of metastable liquid phosphorus, rather than stable red phosphorus, was utilized. The vapor pressures of P2 and P4 were determined from the dew points. Ther…
The unique tensile properties of keratin fibers in water led Speakman to develop the technique of fiber calibration which has become one of the mainstays of hair testing methodology. We have followed a similar approach in studying the torsional rigidity of hair. A simple modification allows for the torsion pendulum te…
The origin of large frequency dispersion in Mott‐Schottky plots was studied for electrodes, the surface structure of which was analyzed by x‐ray photoelectron spectroscopy (XPS) and impedance measurements. XPS spectra revealed that the atomic composition at the surface was different from that in the bulk. Impedance me…
Abstract
Subconjunctival injection of 0.2 ml of the following solutions was carried out once a day for two weeks in the albino and pigmented rabbit: commercial 0.5% timolol or 1% befunolol ophthalmic solutions, both containing benzalkonium chloride, and also these drug solutions containing no preservative, ophthalmic base solu…
The glycosides of Dregea volubilis (L). BENTH. were further investigated. Five new glycosides named dregeosides H (1), Dp1 (2), Da1 (3), Gp1 (4), and Ga1 (5) were isolated and their structures were characterized on the basis of chemical and spectral evidence.