Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
By comparing the propagation of electrical trees in polyethylene with the evolution of artificial air-filled cavities in epoxy, it is possible to envisage the dielectric breakdown as a treeing process. Experiments were carried out on epoxy resin specimens with voids of 0.250 mm thick and 3 mm in diameter. The propagat…
14C labeled ethylenediaminetetra (methylene phosphonic acid) and triethylenediaminetetra (methylene phosphonic acid) have been used to study their adsorption on calcium sulfate dihydrate crystals radiometrically under different conditions. Kinetics of crystal growth of calcium sulfate dihydrate crystals was studied bo…
Measurements of the internal friction of aluminium alloys containing hydrogen have been made from 77 to 300 K at 35 kHz using a composite resonator technique. Perfection of a metallic bonding technique for the transducer-specimen composite produced background dampings which were typically of the order Q −1 ≃ 10−6. Cri…
Ionomers based on propylene–acrylic acid copolymer have been prepared and their rheological behavior studied. With different cations the melt viscosity at any shear rate increases as tributylamine salt < acid < zinc salt < sodium salt. Similarly, the activation energies for viscous flow follow the order polypropylene…
This paper describes some of the unique properties and performance characteristics of triaxial woven fabrics. With three systems of yarn interlacing at sixty-degree angles with one another, triaxial woven fabrics provide less of an anistotropic behavior and offer an alternative to the inherent structural weaknesses of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron-transfer reactions accompanied by large structural changes. 1. Lucigenin-10,10'-dimethyl-9,9'-biacridylidene redox systemElisabet Ahlberg, Ole Hammerich, and Vernon D. ParkerCite this: J. Am. Chem. Soc. 1981, 103, 4, 844–849Publication Date (Print):February 1, 1981P…
The effect of direct interactions between suspended particles on their diffusion coefficient is investigated starting from the generalized Einstein relation. It is shown that an attractive potential added to the hard core repulsion leads to a decrease of the diffusion coefficient, whereas a repulsive term has the oppo…
Abstract Trioctahedral smectite and regularly interstratified chlorite/smectite in strata of the East Berlin Formation of the Connecticut Valley are largely restricted to black shale and gray mudstone deposited in alkaline, perennial lakes. The precursor of the mixed-layer clay appears to have been a smectite. Alkalin…
Gravimetric measurements on galvanized steel and cathodic polarization curves indicate that corrosion of zinc in 3% is inhibited by a low concentration of cobalt ions in solution or by simple predipping of the zinc in 0.05 or 0.1M solutions of . Corrosion inhibition is also obtained when zinc is predipped in a nickel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne-electron-reduced nickel(II)-macrocyclic ligand complexes. Four-coordinate nickel(I) species and nickel(II)-ligand radical species which form paramagnetic, five-coordinate nickel(I) adductsRobert R. Gagne and D. Michael IngleCite this: Inorg. Chem. 1981, 20, 2, 420–425Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures and magnetic properties of cobalt(II) pyrazinecarboxylate and pyrazinedicarboxylate complexesCharles J. O'Connor and Ekk SinnCite this: Inorg. Chem. 1981, 20, 2, 545–551Publication Date (Print):February 1, 1981Publication History Published online1 May 2002…
Abstract A series of segmented polyurethanes based on hydroxylterminated polybutadienes (HTPBD) and their hydrogenated derivatives (HYPBD) has been synthesized. Thermal, mechanical, and spectroscopic studies were carried out over a wide temperature range to elucidate the structure‐property relationships existing in th…
The inhibition of the corrosion of aluminum alloy 2024-T3 in sodium chloride solution was investigated from the view of the chemical species (complexes, compounds) possibly formed with aluminum ion. Four classes of compounds were considered: (I) As a basis for comparison, inorganic oxyanions, chromate, nitrate, perchl…
An electrochemical technique allowing the protection of selected areas of silicon in ethylene diamine-based etchants is reported, and its application to the formation of silicon microstructures is described. Dissolution rates for passivated samples are less than 5 Å/minute, a factor of over 3000 times less than for un…
With the higher rolling speeds used in modern cold-rolling mills, proper roll cooling has become a critical factor in avoiding problems of excessive roll spalling and poor thermal crowning. Poor thermal crowning of rolls can severely affect the shape and profile of sheet and strip products. To determine the influence…
An effective width approach is presented for predicting ultimate strengths of thin-walled compression elements with edge stiffeners. In conjunction with procedures for predicting ultimate strengths, a requirement for adequate stiffener rigidity is given. Stiffener adequacy is assessed as that stiffener rigidity for wh…
This paper presents and discusses particle behavior at solidification fronts from a thermodynamic point of view. Engulfing or rejection of particles embedded in a melt by solidification fronts depends on whether such quantities as the free energy of adhesion or of engulfing are positive or negative. As the relevant en…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLabile (trifluoromethanesulfonato)cobalt(III) amine complexesNicholas E. Dixon, W. Gregory Jackson, Martin J. Lancaster, Geoffrey A. Lawrance, and Alan M. SargesonCite this: Inorg. Chem. 1981, 20, 2, 470–476Publication Date (Print):February 1, 1981Publication History Publish…
An experimental procedure is described which allows the determination of the viscosity coefficients η1, η2, η3 and η12 for nematic liquid crystals as a function of temperature. Errors which arise from the surface and the flow alignment are discussed in detail. The measurements are performed on the nematic liquid cryst…
<div class="htmlview paragraph">An innovative design of ceramic filter for diesel engine exhaust particulate matter is described. It is a cellular ceramic honeycomb with porous walls which act as the filter medium. Test results relating the effects of wall thickness, cell density, porosity, and filter volume on…