Materials Literature
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Formation of fission gas bubbles heretofore has not been observed in uranium-aluminide fuels. Recent irradiations to record high burnups offered a possibility to determine the onset of fission gas bubble formation in this type of fuel. Present experimental evidence suggests that UAl2, UAl3, and UAl4 do not form fissio…
Abstract The activation energies for the racemization of the optically active diaryl selenoxides were estimated by the use of the 77Se NMR spectra of the diastereomeric diaryl selenoxides.
Abstract Successful new thermo‐crosslinking reactions of copolymers of various phenyl methacrylates by use of polyfunctional epoxy compounds were carried out in the film state at 100–150°C in presence of quaternary ammonium salts, quaternary phosphonium salts, tert ‐amines, or the crown ether dicyclohexyl‐18‐crown‐6/p…
Abstract Polymerization conditions of di‐ t ‐butyl fumarate and di‐trimethylsilyl fumarate were studied in detail. They cannot be polymerized by either anionic or coordination initiators, but radical and radiation polymerizations are successful. Characterization of poly(di‐ t ‐butyl fumarate), obtained thereby, with 1…
Mark E. Krejci, Rex L. Lowe, The Seasonal Occurrence of Macroscopic Colonies of Meridion circulare (Bacillariophyceae) in a Spring-Fed Brook, Transactions of the American Microscopical Society, Vol. 106, No. 2 (Apr., 1987), pp. 173-178
In a series of studies on the wettability of textile assemblies, apparent contact angles (ϕ) of wax-coated monofilament nylon and polyester mesh screens to water were measured to investigate the effect of the woven structure on the repellency of textiles. Expressions for the liquid-solid and liquid-air interfaces per…
As a model for a poly(methyl methacrylate ) chain which contains a head-to-head unit, the thermal degradation of tetramethyl 2,4,5,7-tetramethyloctane-2,4,5,7-tetracarboxylate has been studied. The meso compound degraded at 210º to give seven products which have been characterized by spectroscopic techniques and synth…
Measurements of the proton spin-lattice relaxation rate, ${T}_{1}^{\mathrm{\ensuremath{-}}1}$, reveal that the organic insulator copper phthalocyanine Cu(PC) is a highly one-dimensional Heisenberg system. ${T}_{1}^{\mathrm{\ensuremath{-}}1}$ diverges as ${\ensuremath{\omega}}^{\mathrm{\ensuremath{-}}1/2}$ down to 11.4…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR characteristics of separated fractions of mesophase pitchesL. S. Singer, I. C. Lewis, D. M. Riffle, and D. C. DoetschmanCite this: J. Phys. Chem. 1987, 91, 9, 2408–2415Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published inissue 1…
This paper deals with the evaluation of crystal lattice transformations and decrys tallization brought about in cotton fibers by chemical treatments, using x-ray diffiaction techniques. Suitable indices have been evolved to quantify cellulose II and total crys tallinity values, and cotton fibers subjected to widely di…
Abstract Two mixed oxides, La2NiO4−x and LaSrNiO4−x, had the K2NiF4 structure in the oxygen-pressure range from 58000 down to 130 Pa at 1173 K. The oxygen-vacancy concentration, x, in both La2NiO4−x and in LaSrNiO4−x at 1173 K was determined by thermogravimetric analysis in the oxygen-pressure range from 58000 to 1.3…
A study is presented of the optical order parameters and spectroscopic properties of 3′-hydroxyquinophthalone and 3,9-disubstituted perylene dyes in nematic liquid crystalline mixtures. The results of this study are discussed in terms of the effects of the dye structure on the order parameters. From the systematic var…
The carbon fiber/carbon matrix composites (C/C composites) are widely used in such systems as rocket nozzles, reentry shields of space vehicles, disk brakes, and heating elements. However, the unprotected C/C composites have very poor oxidation resistance even at temperature as low as 500°C. In this work, the oxidatio…
Abstract Large single crystals of monoclinic nitrilotriacetic acid, N(CH 2 COOH) 3 , NTA, and of orthorhombic isotypic X 2 Zr[N(CH 2 COO) 3 ] 2 · 2 H 2 O (X = K, Rb, Cs) have been grown from aqueous solutions. They possess optical quality and have dimensions up to 10 mm and larger. The complete dielectric, piezoelectr…
Abstract The name volkonskoite was first used in 1830 to describe a bright blue-green, chromiumbearing clay material from the Okhansk region, west of the Ural Mountains, U.S.S.R. Since that time, the name has been applied to numerous members of the smectite group of clay minerals, although the reported chromium conten…
The anodization of aluminum covered with a thin crystalline thermal oxide layer in a solution of ammoniumpentaborate in water requires less charge than the anodization of a specimen not covered with thermal oxide to the same voltage. This behavior is connected with the formation during anodization of crystalline oxide…
Low-temperature X-ray diffraction measurements performed on tetra-tert-butyltetrahedrane revealed the existence of clathrates in crystals without hydrogen bonds. Both N2 and Ar are entrapped. The deformation density determined for the Ar clathrate revealed that the tetrahedral bonds are bent outward from the CC bond…
Water treeing is one of the main causes of premature breakdown of the polymeric insulation of HV power cables. The work reported in this paper is the combined effort of three different laboratories to investigate water treeing behavior of several polymers by complementary techniques. These include determination of wat…
Icosahedral quasiperiodic crystals of the Al85Si1Mn14system have been prepared by rapid quenching from the melt. Thermal analysis measurements, electrical resistivity and neutron thermodiffractometry have shown that the alloy transforms into conventional crystals in a two-step mechanism producing first the 0-Al6Mn pha…
A graphic multiple peak resolution method by wide angle X-ray scattering (WAXS) pattern was described and used to estimate the interplanar spacings, crystallinities, and crystalline sizes of eight poly(ethylene terephthalate) (PET) fibers. The values for interplanar spacings of Dacron 54 suggested that the unit cell m…