Materials Literature
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The present research, which has included experiments on both fracture-mechanics specimens and actual pipe sections, has shown that hydrogen gas can dramatically increase fatigue-crack-growth rates in steels that are typical of those used in pipelines. The specific materials used in the present work were ASTM A516, AST…
The U(VI)‐U(V)‐U(IV) redox equilibria were monitored in two sodium aluminophosphate base compositions at a variety of melt temperatures, imposed oxygen fugacities, and uranium contents. The higher redox states of uranium were quite soluble in the phosphate glasses, whereas U(IV) would readily precipitate from the melt…
Abstract The replacement of styrene by other crosslinking monomers in unsaturated polyester resins has been investigated because of the possible toxicity of this monomer and the strong smoke evolution of burning polyester materials. A theoretical study has been carried out to provide criteria for the applicability of…
Abstract The MM 2 force field has been used to calculate the strain energies of a representative series of bridgehead alkenes, and the results compared to similar previous calculations using the MM 1 force field. The new results roughly parallel the old ones, although the strain energy of a given compound is normally…
Summary A sequence of different weathering stages of garnet under humid tropical conditions (Yaounde area, Cameroon) is described micromorphologically and mineralogically. The fissures, already observed in ‘fresh’ garnet in the rock, increase in number and size in the saprolite, and tend to get filled with well crysta…
Abstract Interactions of ammonium sulphates and various silicate and oxide minerals have been studied by X-ray heating methods and simultaneous TG-DTA. Kaolinite and other clay minerals were found to be very susceptible to these sulphating treatments, (NH 4 ) 3 Al(SO 4 ) 3 , (NH 4 )Al(SO 4 ) 2 and Al 2 (SO 4 ) 3 being…
IntroductionBy a non-Euclidean crystallographic (N.E.C.) group, we shall mean a discrete subgroup F of isometries of the non-Euclidean plane with compact quotient space, including those reverse orientation, reflections and glide-reflections.Let G denote the group of isometries of the upper-half plane D and let G / den…
In contrast to , which is an efficient commercial phosphor, isostructural shows poor luminescence efficiency under host excitation at room temperature. In this work, the reason for this difference has been studied by optical measurements of solid solution . As is already known, the charge transfer band of Eu 3+ is loc…
Literature is reviewed on the effect of nickel in low alloy steels on their resistance to hydrogen stress cracking. The greatest portion of literature pertains to H2S environments since there is a controversy in the petroleum industry as to the effect of Ni. Addition of greater than 1 % Ni to carbon and low alloy stee…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures of the three phases of (NH3C3H6NH3)MnCl4 and a proton nuclear magnetic resonance investigation of its phase transitionsJoseph C. Crowley, Harold W. Dodgen, and Roger D. WillettCite this: J. Phys. Chem. 1982, 86, 20, 4046–4055Publication Date (Print):Septem…
Abstract Crystals of fractionated trans ‐1,4‐polyisoprene (TPI) were grown from amyl acetate solution at two weight fractions, 5.7 × 10 −4 and 0.011; for the lower concentration a precooling followed by heating and then crystallization at temperatures in the 10–32°C range was used, while for the higher concentration t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInductive, steric, and environmental effects in the nonaqueous electrochemistry of hexakis(aryl isocyanide)chromium complexesDavid A. Bohling, John F. Evans, and Kent R. MannCite this: Inorg. Chem. 1982, 21, 9, 3546–3551Publication Date (Print):September 1, 1982Publication H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAntimicrobial Agents From Higher Plants. Dragon's Blood ResinG. S. R. Rao, M. A. Gerhart, R. T. Lee III., L. A. Mitscher, and S. DrakeCite this: J. Nat. Prod. 1982, 45, 5, 646–648Publication Date (Print):September 1, 1982Publication History Published online1 July 2004Publish…
Following the discovery of a charge-density wave in the cubic chalcogenide spinel Cu${\mathrm{V}}_{2}$${\mathrm{S}}_{4}$, the other known copper chalcogenide spinels were synthesized and their magnetic susceptibility measured to look for similar phase transitions. No phase transitions were observed in these other comp…
Corrosion characteristics of some commercially pure aluminum alloys (1060, 1100, 3003, and 5052) in different concentrations of nitric acid have been studied at different temperatures. Alloy 3003 exhibits maximum corrosion in all the acid concentrations followed by 5052, 1100, and 1060 alloys. The corrosion rate of al…
Abstract The optical properties of thermally crystallized polyethylene terephthalate (PET) were investigated using the methods of small‐angle light scattering, density, and haze measurements. The results indicate that the haze in crystallized PET results from scattering due to crystalline aggregates called spherulites…
Measurements have been made of the velocity of sound and the velocity of free retraction for stretched strips of vulcanized natural rubber. Both of these velocities are found to increase markedly with increasing strain, in agreement with earlier work. The velocity of sound is shown to be related to the appropriate mod…
Abstract The probable number of hydrogen bonds has been calculated as a function of the imino acid content for water‐bridged collagen structures. With increasing imino acid content in collagen, the number of hydrogen bonds stabilizing triple‐helical structures become saturation. This might explain the asymptotic chara…
Abstract A model of the manufacture of rigid polyurethane foams by free rising is presented. The extent of cream and rise periods as well as the amount of blowing agent necessary to give the desired foam density are theoretically predicted. The rate of blowing agent evaporation is calculated from an experimental boili…
Fused silica and flowing hydrogen gas react in the experimental temperature range of 1200° to 1400°C to form SiO and H 2 O vapors. Above a critical flow rate of hydrogen gas, the reaction rate is independent of gas flow rate and is not transport‐controlled. The apparent activation energy for the overall process was 34…