Materials Literature
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The effects of molecular weight of the base silicone, filler and copolymer concentrations on compression set, strain, creep and dynamic elastic modulus were determined. The molecular weight of the base silicone had the least effect on these properties although low molecular weights showed better properties. Chain exte…
Abstract Die Einflüsse von Mo, V, Nb, Ti, Zr und deren Karbiden auf die Korrosion und Wasserstoffaufnahme von Eisen in 1 M H 2 SO 4 /N 2 25°C wurden an binären und ternären Fe‐Me‐Legierungen mit rund 0,2 At.‐% Me mittels elektrochemischer und oberflächenanalytischer Meßmethoden untersucht. Unter den Versuchsbedingunge…
Abstract The use of HBTBP as a crosslinking agent in fluoroelastomers has been reported. HBTBP was found to be especially suitable for FKM-G polymer, and the mechanism of crosslink formation in this fluoroelastomer was investigated. Compounding studies, swelling measurements, solvent extraction, and nitrogen tests hav…
Powder Metallurgy (P/M) materials, especially those made of high strength steels, are often reported in the technical literature to have poor machinability when compared to their wrought or cast counterparts. In order to characterize the machinability of single phase P/M materials and to identify the influence of poro…
C 76 H 92 N 4 O 4 Pd. 3C 6 H 12 cristallise dans C 2 /c avec affinement jusqu'a 0,086. C 76 H 92 N 4 O 4 Zn. 4C 6 H 12 cristallise dans C 2 /c avec affinement jusqu'a 0,10
Abstract Possible differences in soil characteristics between ortstein and nonortstein Spodosols were studied. Organic C, fine particles (silt plus clay), and extractable Al by dithionite‐citrate, pyrophosphate, acid NH 4 oxalate, and NaOH were all higher in Bh than other horizons, except silt plus clay contents in Bt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic nitrosyl chemistry. 37. Synthesis, characterization, and some chemical properties of unusual 16-electron dialkyl(.eta.5-cyclopentadienyl)nitrosylmolybdenum and -tungsten complexesPeter Legzdins, Steven J. Rettig, and Luis SanchezCite this: Organometallics 1988…
Iron(II) and nickel(II) complexes of 2,2'bithiazole (2bt) have been prepared. Salts of [Fe(2bt)3]2+ have spectral properties typical of iron(II) diimine systems. Their magnetic and Mossbauer spectral properties show an anomalous temperature-dependence which is associated with a temperature-induced singlet (1A1) ? quin…
A mathematical model is suggested for studying the radial packing density of yarn, and the proposed model is used for a comparative study of ring and rotor spun yarns. The results show that rotor spun yarn consists of a smaller number of fibers in the cross section compared to ring spun yarn, which explains the lower…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic states and potential energy surfaces of rhodium dihydrideK. Balasubramanian and Dai Wei LiaoCite this: J. Phys. Chem. 1988, 92, 22, 6259–6264Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Published inissue 1 November 1988htt…
Abstract Soils on hillslopes in the Grand Prairie and eastern Edwards Plateau regions of Texas are developed from multiple facies of interbedded weakly to strongly indurated Cretaceous limestones. Most contain either calcic or petrocalcic horizons. Stable C isotope analysis of the carbonate‐enriched horizons from seve…
Summary A mathematical model was developed to describe the scale-inhibitor-adsorption squeeze process. The objective of this study was to create a tool that will predict the duration of a squeeze treatment, given the operating parameters and the rock and inhibitor properties. Assuming that there is local equilibrium b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExcited states of titanium(2+): sharp-band and broad-band near-infrared luminescence from titanium(2+) in magnesium chloride and magnesium bromideStuart M. Jacobsen, Hans U. Guedel, and Claude A. DaulCite this: J. Am. Chem. Soc. 1988, 110, 23, 7610–7616Publication Date (Prin…
A characterization of crystallographic unit cells as vectors in a Euclidean six-dimensional space (E6 in the usual mathematical notation; here termed G6) is introduced, in which the non-triclinic Bravais lattice types form one-, two-, three- and four-dimensional linear subspaces. This formalism makes the determination…
Abstract If a metal surface is in contact with an aggressive atmosphere, then thin electrolyte layers are formed on top of the metal surface which may be as thin as a few monolayers of water. – Two techniques are described which allow to analyze the electrochemical processes involved in the corrosion of such a surface…
Mechanisms of machining (abrasive), fatigue and transfer wear are reviewed in the context of the interfacial shear stress (adhesive) and surface roughness (deformation) conditions in which they occur. In the first part it is shown how model predictions of surface flow, friction and wear may be mapped on to a field wit…
Summary Deposit formation was measured in a model laboratory plant in which whole milk was in contact with a heated surface at 100 °C for 1 h. The effect of the interfacial properties of various poly mer-coated surfaces on the amount and the adhesion strength of deposit was determined. The nature of the surface influe…
To dispel a widespread but erroneous belief among physicists that the penetration of ac magnetic fields into normal metals is determined by the usual skin depth δ alone, a simple analysis is presented of two problems in each of which a different length scale determines the effective screening. For a cylindrical can of…
We report X-ray diffraction, density, ultrasonic velocity and refractive index studies in the N(p-n-pentyloxy benzylidene) p-n-alkylaniline compounds, viz. 50.5, 50.6 and 50.7. The nematic-smectic A (NA) transition is found to be weak first order in 50.6 while it is second order in 50.5 and 50.7. The salient features…
The least-squares method incorporating orthonormal relation between wavefunctions is formulated. The method fulfils the idempotency condition and allows the representation of wavefunctions to be obtained from charge-density distributions measured by the X-ray diffraction method. The present method can be applied to bo…