Materials Literature
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American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Abstract The clay mineral sepiolite has been under investigation since 1972 by our laboratories for possible use in drilling fluids. This paper reviews the work done on this clay mineral in an effort to obtain a drilling fluid capable of withst…
Samples of annealed and severely cold-rolled vanadium were bombarded at room temperature with 150-keV H+ ions at fluxes from 1.2×1015 to 1.2×1016 H+/cm2 sec to doses of from 3.6×1017 to 3.2×1019 H+/cm2. All samples irradiated to doses greater than 1.1×1019 H+/cm2 exhibited blistering in spite of the fact that temperat…
Extensive electrical and thermal studies on transitions in (CrxV1-x)2O3, 0 ⩽ x ⩽ 0.03, and in (TixV1-x)2O3, 0 ⩽ x ⩽ 0.06, have been undertaken. An increase in Cr-doping (0 ⩽ x ⩽ 0.018) raises the temperature of the low-temperature transition and elevates the resistivity of the metallic phase ; it first sharpens and la…
Keith Marshall, David Sixsmith; The flow properties of microcrystalline cellulose powders, Journal of Pharmacy and Pharmacology, Volume 28, Issue 10, 1 Oct
The swelling of metals during irradiation is due to the preferential drift of interstitials to dislocations thus allowing vacancies to condense in excess of interstitials at voids. Previously the dislocation preference for interstitials has been calculated from an isolated dislocation model, here the effect of the com…
The numerical determination of current and potential distributions has been performed for plating corrosion systems, where failure to coat a small area leads to corrosion at the pinhole. The distributions depend on characteristic parameters for the disk anode and surrounding plane cathode and reveal that each of the e…
Absorption measurements on amorphous selenium, arsenic and arsenic triselenide have been performed using synchrotron radiation. The results obtained reveal the importance of many body effects, matrix elements, and site of the initial state in the interpretation of optical data corresponding to transitions from core le…
Abstract SrNiO 2 ‐Einkristalle wurden bei hohen Temperaturen unter O 2 ‐Druck dargestellt. SrNiO 2 ist isotyp mit SrCuO 2 (Raumgruppe D —Cmcm, a = 3,581, b = 16,362, c = 3,915 Å) Die kristallchemische Verwandtschaft zum K 2 NiF 4 ‐Typ wird diskutiert.
The effect of cobalt substitutions in manganese zinc ferro ferrites for inductor applications is discussed. Permeability-temperature curves are presented over the range -50 degrees C to 200 degrees C for compositions where the cobalt level is varied between 0 and 0.010 per formula unit, the Mn/Zn ratio and Fe 2+ level…
Abstract The Mössbauer spectra of graphite–FeCl3 and graphite–FeCl3–AlCl3 compounds with varying FeCl3/AlCl3ratios were measured. At 298 K, the isomer shift of the Fe3+ peak of FeCl3 intercalated in the graphite–FeCl3 compounds was larger than that of pure anhydrous FeCl3, and two sets of Fe2+ quadrupole doublets appe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual hydrogen bonds. A neutron diffraction study of the hydrogen dinitrate ion, (O2NO.cntdot.H.cntdot.ONO2)-, in cesium hydrogen dinitrateJacques. Roziere, Marie T. Roziere-Bories, and Jack M. WilliamsCite this: Inorg. Chem. 1976, 15, 10, 2490–2494Publication Date (Print)…
The use of triazole, benzotriazole, and naphthotriazole as corrosion inhibitors for brass is briefly reviewed. The corrosion of 70/30 brass immersed in a wide range of solutions is reported both with and without the inhibitors. The inhibitor efficiency of benzotriazole is given as a function of the solution pH and the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered and disordered phases in mixed dodecylammonium and hexadecylammonium tetrachloromanganate(II)Vincenzo Salerno, Andrea Grieco, and Michele VacatelloCite this: J. Phys. Chem. 1976, 80, 22, 2444–2448Publication Date (Print):October 1, 1976Publication History Published o…
An analysis of stress distributions within circumferential clasp arms with various tapers, was undertaken in an effort to (1) determine the area of maximum stress concentration in both tapered and non-tapered clasps, and (2) to compare this point of maximum stress concentration with the area of frequent clasp breakage…
Electron-paramagnetic-resonance conversion-rate measurements combined with optical-absorption data in Ni-doped ${\mathrm{SrTiO}}_{3}$ have been carried out. From these experiments in oxidized and reduced crystals, assignment of the photochromic bands in the visible could be made and the trapping mechanism identified.…
New materials for optical thin films are presented. Zirconium oxide, titanium oxide, cerie oxide, and hafnium oxide in the form of black tablets or cones of various sizes for the electron beam evaporation technique were developed. These materials are oxygen depleted and give an uniform melt during the evaporation to g…
An investigation to determine the number of proteins comprising the keratin of the chick down feather was carried out using anion‐exchange chromatography of the carboxymethylated derivatives of reduced feather proteins, followed by examination of discrete protein fractions by polyacrylamide gel electrophoresis at pH 9…
Abstract The low‐temperature heat capacity of collagen (in the hydrated and dehydrated states) and the large entropy of collagen in the coiled state relative to the same protein in the helical state were investigated. The heat capacity for collagen in the solid state in the temperature range 4°–50° K changes proportio…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Monoclinic unit-cell parameters for LnPO4 (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb and Dy) have been redetermined from Guinier photographs, and are plotted against effective ionic radii of the lanthanides. Full powder-diffraction data are given for LaPO4 and GdPO4.