Effects of Oxygen Concentration and ｐH on Corrosion Behavior of Iron and Steel in Oxygen Dissolved Solution of Potassium Chloride
(ReivedJune181970
Materials Literature
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Uranium-233-Bearing Salt Preparation for the Molten Salt Reactor Experiment
The Molten Salt Reactor Experiment has been refueled with an enriching salt concentrate, 7LiFUF4 (73 to 27 mole%). Sixty-three kilograms of this was prepared in a shielded cell in the Thorium-Uranium Recycle Facility at Oak Ridge National Laboratory. The preparation process involved reducing 233UO3 to UO2 by treatment…
Cerotungstite, a cerian analogue to yttrotungstite, from Uganda
This paper describes the mineral cerotungstite found as a secondary crystallization in some tungsten deposits in northern Rwanda and in the Kigezi District of south-western Uganda. Cerotungstite represents a cerian analogue to yttrotungstite known from the Kramat Pulai tin deposit in Malaysia. Therefore, some new data…
Direct observation of dislocations in natural barite (BaSO4)
Dislocation structures of (001) sections of natural crystals of barite have been studied by x-ray diffraction topography. Pure edge dislocations along [100] with Burgers vector b = b [010], and pure screw dislocations with Burgers vector b = (a + b) [l10] were found. Mixed dislocations which were either predominantly…
Photoluminescence of Cr-Doped CaTiO3
At 4 and 77 K, photoluminescence from nominally undoped and 0.0025% Cr-doped CaTi${\mathrm{O}}_{3}$ shows identical spectra in the infrared with an intensity ratio of 1:2. The emission is attributed to the $^{2}E\ensuremath{\rightarrow}^{4}A_{2}$ transition of the ${\mathrm{Cr}}^{3+}$ ion at a ${\mathrm{Ti}}^{4+}$ sit…
Flavin-photosensitized reactions of retinal and stilbene
1. Retinol and stilbene are both isomerized when they are illuminated anaerobically in the presence of flavins. 2. Triplet quenchers (e.g. oxygen, potassium iodide and paramagnetic ions) inhibit the reaction more efficiently than they quench flavin fluorescence. At 77 degrees C in a diethyl ether-isopentane-ethanol (5…
Thermal Expansion of Polycrystalline Graphite
Thermal expansion characteristics of a group of polycrystalline graphites have been measured to 2400°C by a method which permits acquisition of meaningful expansion data without resorting to reference standards. Direct measurements on specimens while in the furnace were accomplished by using two 8-in. focal length Gae…
THE ROLE OF AMOEBOCYTES IN THE REGENERATION OF SHELL IN THE LAND PULMONATE,EUPLECTA INDICA(PFIEFFER)
An hour after the damage of the shell in Euplecta indica (Pfieffer) a thin, structureless, basophilic regeneration membrane appears. Thereafter, a large number of amoebocytes precipitate on this membrane. Soon these break up and contribute their cytoplasmic contents to the regenerate. This is positive for glycoprotein…
The Influence of Aluminum-Containing Lewis Acids on Polyisobutylene, Isobutylene-lsoprene Copolymers (Butyl Rubber), and Chlorinated Isobutylene-lsoprene Copolymer (Chlorobutyl)
The influence of aluminum-containing Lewis acids, e.g., AlCl3, AlEtCl2, AlEt2Cl, AlEt3, and AliBu3, on polyisobutylene, isobutylene-isoprene copolymer (butyl rubber), and chlorinated butyl rubber has been investigated in nonpolar and polar solvents at various Lewis acid concentrations in the temperature range -10 to -…
Bremsstrahlung Cross Sections for Al and Au for Incident-Electron Energies of 0.05 and 0.20 MeV
Comparisons of theoretical electron-bremsstrahlung cross sections for Al and Au from the work of Brysk, Zerby, and Penny are made with new experimental values at incident-electron energies of 0.05 and 0.20 MeV. Photon energies of 10, 20, 30, and 40 keV are considered in the angular region from 10 to 120 deg at 0.050-M…
Ballistic limit determination in impacts on multimaterial laminated targets
Two-dimensional numerical analyses have been performed of projectile impacts at 15,00020,000 fps into finite laminated targets consisting of plastic layers backed by aluminum substrates. These analyses used the SHAPE code, with a hydrodynamic-elastic-plastic distortional model. Three solutions are discussed. The first…
The Dimensional Properties of Knitted Wool Fabrics
Tumble-drying from the wet fabric state is shown to be a reasonable means of fully-relaxing rib structures. By this technique, an approximate discrimination can be made between dimensional changes due to relaxation and felting of all- wool rib structures. Upon washing from the fully-relaxed state, untreated fabrics fe…
Errors in x-ray analysis of carbonates due to solid-solution variation in composition of component minerals
Abstract Determination by X-ray diffraction of the relative proportions of component minerals in sediments and rocks involves comparison of the integrated intensity of selected reflections from component minerals in the unknown mixture to standard calibration curves. Although the analysis may be rapid and precise, a n…
The lattice parameter of the α copper–titanium solid solution
The lattice parameter of the α copper-titanium solid solution was measured as a function of titanium concentration. The value of aO increased non-linearly from 3.6150 Å for pure copper to 3.6421 Å for an alloy containing 7.6 at.% titanium. The rate of change of the parameter increased up to 3 at.% titanium and decreas…
The Formation of Stable Sols from Laponite, A Synthetic Hectorite-Like Clay
Abstract The effects of simultaneous additions of electrolyte and peptiser to dispersions of the synthetic hectorite-like clay, Laponite, have been studied. It has been unexpectedly discovered that whereas many cations cause gelling and flocculation of the dispersions as expected by colloid chemical theory, some catio…
Refinement of the crystal structure of cubanite and polymorphism of CuFe2S3
Article Refinement of the crystal structure of cubanite and polymorphism of CuFe2S3 was published on December 1, 1970 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 132, issue 1-6).
The temperature dependence of ordering in magnesium ferrite
Cation ordering in magnesium and nickel ferrites was studied by X-ray diffraction measurements carried out at the temperature of equilibration and also on quenched specimens. The order parameters on quenched specimens agreed with results previously reported by others but not with values measured at temperature. Previo…
Depolarization of linearly polarized light by a polycrystalline specimen
One of the methods in use for measuring the kinetics of isothermal crystallization of polymers is the recording of the depolarization of plane-polarized light by a microscope specimen. A relation between this depolarization and the volume fraction crystallized has been derived taking into account the polycrystalline n…
Variable Corrosion Resistance of 18Cr-8Ni Stainless Steels: Influence of Environmental and Metallurgical Factors
In this study, previously derived relationships between critical anodic current density and chemical composition of Type 304 stainless steel were used to develop a new series of 18Cr-8Ni alloys with improved passivating properties. Electrochemical and corrosion tests confirm that these special Type 304 alloys have sup…
Some observations on the ageing of sodium chloride compacts
Abstract The diametrical crushing strength of an ideal system of compacted particulate material, and the relation between strength and mean compaction pressure depend on the time at which the strength is determined. Strength increases of over 100% during the first hour after compression are attributed to stress relief…