Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman spectra and excitation profiles of tris(.alpha.-diimine) complexes of iron(II)R. J. H. Clark, P. C. Turtle, D. P. Strommen, B. Streusand, J. Kincaid, and K. NakamotoCite this: Inorg. Chem. 1977, 16, 1, 84–89Publication Date (Print):January 1, 1977Publication…
Ferroelectricity has been discovered in calcium vanadate. Large, transparent crystals have been grown by Czochralski pulling. Electrical 180° domains of millimeter dimensions are observed by etching as-grown crystals. The ferroelectric Curie temperature, Tc = 1383 K, has been determined from dielectric, thermal and py…
The long term behaviour of epoxy resin subjected to high alternating electrical stress was studied using optical magnifications of up to 1500, a scanning electron microscope, and a high sensitivity discharge detector. The formation of voids in initially void-free specimens was investigated when voltages of duration be…
The preparation, properties, and n.m.r. spectra of 1 : 1 triphenylphosphine oxide adducts of [M{N(SiMe3)2}3](M = La Eu, or Lu) and dimeric peroxo-species [M2{N(SiMe3)2}4(O2)(PPh3O)2](M = La, Pr, Sm, Eu, or Lu) are described. The crystal and molecular structures of [La{N(SiMe3)2}3(PPh3O)](1) and [La2{N(SiMe3)2}4(O2)(PP…
Silicon-29 n.m.r. spectra have been obtained for a number of aqueous solutions of sodium and potassium metasilicate. The assignment of peaks to various silicate species is discussed. Linewidth and spin–lattice relaxation time measurements are reported as a function of ageing of the solutions in sealed glass tubes, and…
The corrosion and hydriding performance of zirconium-base alloys under pressurized water reactor (PWR) and boiling water reactor (BWR) conditions, as gaged by a comprehensive review of the technical literature, has been evaluated. Starting with a brief historical description of the development of zirconium for claddin…
Abstract A detailed structural characterization of three aromatic polyamide (PPT) fibers has been carried out by means of direct electron microscope observations and X‐ray and electron diffraction analysis. Data obtained by the diffraction techniques are supplemented by high‐resolution images recorded from fragmented…
Description 45 papers present vitally important data on the behavior of zirconium alloys in nuclear reactor environments.
X‐ray photoelectron spectroscopy (ESCA) has been employed to examine several elemental metal foils which were simultaneously allowed to develop natural passivation (oxidation) layers. The metals considered included representative transition metals and also several Group III and IV elements. Sputter etching was employe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAsymmetric syntheses via enantiotopically selective horse liver alcohol dehydrogenase catalyzed oxidations of diols containing a prochiral centerAnthony J. Irwin and J. Bryan JonesCite this: J. Am. Chem. Soc. 1977, 99, 2, 556–561Publication Date (Print):January 1, 1977Public…
Differential scanning calorimetry (d.s.c.) and nuclear magnetic resonance (n.m.r.) techniques were used to study the melting of ice in porous solids.At low water contents (less than about three monolayers) no freezing or melting was observed. As the water content was increased, a single melting peak was observed as th…
Microcrystalline cellulose (M.C.C.) having various ratios of crystal region to amorphous one obtained by grinding. Crystallinity was determined for M.C.C. and ground M.C.C. by X ray diffraction method (powder method) using Hermans'theory. Crystallinity was also determined by infrared measurement in converting hydroxyl…
The production of radioactive nuclei during the operation of a light-water reactor is traced, and their decay history is followed. The potential environmental impacts of this waste are calculated and shown to be comparable to those of other materials we produce. Assuming deep burial, it is shown that there are importa…
The syntheses of four binary porphyrins, two of which are constrained to a "face-to-face" conformation, and their Co2+ and Cu2+ derivatives are described. Electron spin resonance indicates that the intermetallic separation in the binuclear "face-to-face" porphyrins is about 6.5-6.8 A. Electronic spectra and proton mag…
(1977). Radiolysis of Glutathione in Oxygen-containing Solutions of pH 7. International Journal of Radiation Biology and Related Studies in Physics, Chemistry and Medicine: Vol. 32, No. 2, pp. 195-202.
Recent theoretical calculations of the properties of rare gases, and in particular Helium, in the common f.c.c. and b.c.c. metals, are reviewed from the viewpoint of the investigator concerned with the behaviour of rare gas in such radiation damage processes as surface blistering and void swelling. Particular attentio…
Résumé. 2014 Un modèle utilisant l’élasticité de type mixte introduite par de Gennes est construit pour décrire le comportement de cristaux liquides smectiques A soumis à des forces de compression ou de dilatation normales aux couches. Ce modèle prévoit deux types d’instabilités mécaniques, respectivement: basculement…
A new nondestructive technique is described which provides information about the distribution of charges in nonpolar electrets. Changes in the equivalent electret voltage are measured during and after the absorption of a short pulse of heat on one side of an otherwise well thermally isolated electret. The total electr…
Abstract The morphology of porous polysulfone hollow fibers which were spun by the dry–wet spinning process is discussed. It was demonstrated that a relatively moderate quenching medium should be employed in the bore of the nascent fiber in order to produce an isotropic fiber free of macrovoids and intrusion cells. A…
The splay and twist elastic constants (k 11 and k 22) of pentyl, hexyl, heptyl and octyl cyanobiphenyls (5CB, 6CB, 7CB and 8CB respectively) have been determined by the Freedericksz transition method. The results are compared with the bend elastic constants (k 33) and order parameters (S) of these compounds reported b…