Materials Literature
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Abstract The influence of the degree of polymerization (DP) of cellulose was evaluated in the preparation of micron‐sized cellulose IV II lamellar crystals in order to ascertain whether a regular chain‐folded morphology could develop during their growth. For this purpose, sharp fractions of cellulose acetate were coll…
Abstract Ferruginous clay partings in limestones of the marine, largely evaporitic, Upper Triassic Mohila Formation (Makhtesh Ramon, Israel) contain hexagonal plates and cube-like bodies up to one millimeter across. Analyses by electron microscopy, infrared and Mössbauer spectroscopy, and X-ray powder diffraction indi…
Stress corrosion cracking (SCO) investigations of sensitized 304 austenitic stainless steel were conducted using U-bend specimens of 6.45 and 12.85 mm radii of curvature in Samans solution, which represents the polythionic acid solution formed in the petroleum refineries during shutdown as a result of the interaction…
The dispersion of samples of calcium-saturated soil clay, calcium illite, and calcium bentonite was compared with the dispersion of sodium clays. Each clay was first freed of electrolytes, one sample of each being dialysed with water and a second washed with ethanol. All samples were then dried at 105°C. The dialysed…
The foam finishing technology (FFT) process is a novel application system for treating porous substrates with foamed chemicals at very low wet pickups. It involves the use of a rapidly-breaking low-density foam or froth as the delivery medium for finishing chemicals, precise metering and flow control for delivery of f…
The results are presented of an earlier analysis of a triaxial fabric by extension of the classical results of Peirce and Grosberg. Using the geometrical model of this earlier work, a theoretical analysis is presented in which the work necessary to deform the fabric is approximated by the change in strain energy in th…
The mechanism of coercivity in Fe-Cr-Co permanent magnet alloys has been investigated. An attempt has been made to separate the contribution to Hc of various mechanisms and microstructural variables by comparing spherical versus elongated particle morphology and aligned versus random distribution with varying particle…
A general method for the solution of ac low frequency electric fields in insulating systems is proposed. The method is based on decoupling Maxwell's equations, and their solution can beimplemented analytically or numerically. The finite difference numerical method is easily implemented to solve the field in polluted i…
We discuss the development of an original method preparing thermoluminescent dosimeters using magnesium borate and calcium sulfate materials activated with rare earths. This method is based upon the effect of sensitized thermoluminescent emission of basic TLD phosphors as well as on the method for producing these in s…
In concentrated solutions of sodium silicate with SiO 2:Na 2 O ratios ranging from 2:1 to 4:1, about 75% of the silica is present as extremely small particles which increase from 1 to 2 nm in diameter with increasing ratio. It is suggested that the ionized surface of the particles is covered with an absorbed monolayer…
Abstract The complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982 , 996. DOI: 10.1002/anie.198209960
Fe 2 P (space group P 2 m ) is a highly anisotropic, metallic ferromagnet with the spontaneous magnetization directed parallel to the c -axis. The ferromagnetic transition at T c = 217 K is of first order and accompanied by a sudden change in lattice parameters. In order to study the ferromagnetic transition we have m…
Navicula sect. Johnsonieae sensu Hustedt included Navicula scopulorum Bréb. which has been shown to have included two discrete species, one now transferred to Berkeleya Grev., B. scopulorum (Bréb.) E. J. Cox, while the other corresponded to Okedenia scopulorum sensu Mereschkowsky. This species is compared with other m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhosphorus based additives for flame retardant polyester. 1. Low molecular weight additivesRobert W. StackmanCite this: Ind. Eng. Chem. Prod. Res. Dev. 1982, 21, 2, 328–331Publication Date (Print):June 1, 1982Publication History Published online1 May 2002Published inissue 1…
The gaseous degradation products of low density polyethylene exposed to corona discharges were investigated. Temperature and applied voltage were varied independently in order to determine the effect of each on the chemical processes involved in the degradation. Based upon statistical analysis of the results, temperat…
An investigation of the causes and mechanisms of severe exfoliation corrosion damage in aluminum pipe irrigation networks utilizing fresh water has been conducted, making use of electron microscopy and microanalysis techniques, together with chemical and electrochemical methods. Pipes were made of (6000) series alloys…
The hydrodynamics of biaxial nematics has been obtained in the presence of an external field $\stackrel{\ensuremath{\rightarrow}}{H}$. By working with the triad order parameter, we obtain results valid for arbitrary nonsingular textures. We also present the bending energy for biaxial nematics. Our derivation of the hy…
The relationship between polymerisation-depolymerisation reactions and the formation of colloids has been studied for silicate solutions lying in that area of the pH-concentration diagram commonly referred to as the instability region. Changes in both acidic and basic solutions have been followed by a variety of techn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCopper-assisted addition of 3(5)-methylpyrazole to acetaldehyde. Synthesis, structure, and magnetism of a unique tetranuclear copper(II) compound: bis[.mu.-[1-(1-ethanoyl)-5-methylpyrazolato-N2,O]]-tetrakis[.mu.-[3(5)-methylpyrazolato-N1,N2]]-bis(nitrato)tetracopper(II)Richa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome aspects of the electronic structures of a series of trimeric transition-metal cluster complexesAlbert B. Rives, Xiao Zeng You, and Richard F. FenskeCite this: Inorg. Chem. 1982, 21, 6, 2286–2294Publication Date (Print):June 1, 1982Publication History Published online1 M…