Photoelectrochemical Response of Some Layered Chalcogenophosphate Compounds ( MPX 3 )
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Crystal structure of fluoro(2,3,7,8,12,13,17,18-octaethylporphyrinato)-oxoniobium; demonstration of the presence of six-co-ordinated niobium
When HF is bubbled through a solution of [Nb2L2O3](L = porphyrinate), porphyrinatoniobium oxide fluoride complexes are formed. The structures of some of these complexes have been studied from analytical and spectroscopic data. The title compound has been determined by X-ray diffraction methods. Crystals are monoclinic…
Ordering Process in CuPd Alloys during Continuous Heating
The ordering process during continuous heating in Cu-Pd alloys containing 34.74∼44.80 at%Pd was investigated by means of electrical resistivity measurements, X-ray diffraction, hardness test and transmission electron microscopy.In all alloys, the electrical resistivity increased slightly in the early stage of ordering…
Electron transfer in solids. Temperature dependence of dielectric relaxation and conductivity in mixed-valence potassium manganate–permanganate
The site-transfer conductivity expression σ=ne2a2ν/6 kT has been further tested for K3(MnO4)2 by observations of the d.c. conductivity, σ, and of the electron-transfer frequency, ν, from dielectric relaxometry, over a temperature range, providing good agreement both individually and in activation energies E: ν/ν0= exp…
Direct agglomeration of sodium theophylline crystals produced by salting out in liquid.
Sodium theophylline monohydrate was precipitated from ethylene diamine solution of theophylline by adding aqueous sodium chloride solution to the system with or without ethanol. The dried precipitates were redispersed in the filtrate without ethanol and were agglomerated with water liberated from the system by adding…
The Crystal and Molecular Structure of Diaqua(tetraphenylporphinato)cobalt(III) Perchlorate
Abstract The crystal structure of diaqua(meso-tetraphenylporphinato)cobalt(III) perchlorate, [CoIII(tpp)(H2O)2]ClO4, has been determined by the X-ray method. The compound crystallizes in the monoclinic space group P21/c with four molecules in a unit cell of dimensions, a=13.93(4) Å, b=23.46(2) Å, c=17.35(6) Å, and β=1…
The Swelling of Solution Annealed 316 Cladding in Rapsodie and Phenix
It is intended to describe the swelling characteristics of fissile pins clad with solution annealed 316 and irradiated in the fast reactors RAPSODIE and PHENIX. On these materials the effects of the irradiation parameters (damage rate, time and temperature) and of the chemical composition of the steel before irradiati…
An Experimental Study of the Deformation of Zircaloy PWR Fuel Rod Cladding Under Mainly Convective Cooling
In a loss-of-coolant accident (LOCA) the temperature of the cladding of some fuel rods may rise to levels [650 to 810°C (1202 to 1490°F)] where the ductility of Zircaloy is high (∼80 percent). The net outward pressure which will obtain if the coolant pressure falls to a small fraction of its normal working value produ…
Préparation de catalyseurs au molybdène par greffage du pentachlorure de molybdène sur silice en milieu organique
La présente étude concerne l’amélioration de la technique de préparation de catalyseurs molybdène-silice, réalisée par greffage, c’est-à-dire par condensation de pentachlorure de molybdène sur les groupes silanols du support, dans divers solvants organiques.
Migration of Small Pores in Potassium Chloride Due to a Temperature Gradient
Pore migration in KCl crystals subjected to a temperature gradient occurs by a vaporization‐condensation mechanism. The behavior of small (<100 μm) pores was observed using hot‐stage microscopy. A size‐dependent probability of pore motion was noted in which the fraction of mobile pores in a given size range steadily i…
Microstructure and Mechanical Properties of Nonequilibrium Austenite in Fe-C-(Mo, W) Systems Rapidly Quenched from Melts
By melt-quenching technique, nonequilibrium austenitic alloys possessing high strength and hardness combined with good ductility have been found in Fe-C-Mo and Fe-C-W ternary systems. This formation region is limited to about 1.0 to 2.4wt% C and 3 to 22wt% Mo for Fe-C-Mo system and 1.0 to 2.4wt% C and 3 to 24wt% W for…
High-Strength, Creep-Resistant Excel Pressure Tubes
Pressure tubes for CANada Deuterium Uranium Pressurized Heavy Water reactors are made from Zr-2.5Nb by extruding preheated hollow billets into tubes that are cold-worked 30 percent to size. The fabrication process produces fine elongated α-grains with a high dislocation density which makes a large contribution to the…
Preliminary results on dosimetric properties op MgB4O7:Dy
The thermoluminescent properties of magnesium borate, a new tissue equivalent material, have been stu died.
Statics and dynamics near the nematic-columnar phase transition in liquid crystals
A Landau-Ginzburg Hamiltonian describing a liquid crystal in the nematic phase near the nematic-columnar phase transition is used to find the renormalized nematic elastic constants and viscosities. The elastic constants, with the exception of the bend elastic constant, are found to be enhanced by order parameter fluct…
Intermediates in thermal decomposition of nickel(II) complexes: The crystal structures of Ni(SCN)2(NH3)2and Ni(SCN)2
Ni(SCN) 2 (NH 3 ) 2 and Ni(SCN) 2 are stable intermediates in the course of the thermal decomposition reaction Ni(SCN) 2 (NH 3 ) 4 → NiS 2 . Ni(SCN) 2 (NH 3 ) 2 crystallizes in the monoclinic space group C 2/ m with a = 8.698(5), b = 7.991(4), c = 5.619(3) Å, β = 105.91(9)°, Z = 2, D x = 1.85g cm −3 . The crystal data…
Texture Control of Zircaloy Tubing During Tube Reduction
Seven batches of Zircaloy-2 tubing with widely different textures were processed from tube shells of the same size, by different reduction routes using pilger and 3-roll mills. Based on the texture data of these tubes, the texture control of Zircaloy tubing, the texture gradient across the wall, and the texture change…
Development and Application of the Rolling Contact Fatigue Test Rig
The rolling contact (RC) fatigue test rig was developed specifically for rapid and inexpensive evaluation of materials and processes for rolling element bearing applications. The simple geometry of the test specimen, a cylindrical bar, makes it ideal for evaluating new materials where only limited quantities of the ma…
Unusual Michael reaction of acyclic 1,3-dicarbonyl compounds with nitre-olefins. A novel pyrrole synthesis
Acetoacetic esters and pentane-2,4-dione undergo unusual Michael reactions with β-nitrostyrene in methanolsodium methoxide to formthe (2R,3R,2′S,3′S)-bis-(4-acy1-2,3-dihydro-5-methyl-3-phenyl-2)-furylhydroxylamines (5) in high yields. The normal adducts (6) are intermediates in these reactions. Acetylation of compound…
Influence of Temperature on Corrosion Product Film Formation on CuNi10Fe in the Low Temperature Range: I. Corrosion rate as a function of temperature in well aerated sea water
It was found that the corrosion rate of CuNi10Fel·4 in aerated sea water at 40 and 50°c was lower than that at the lower sea water temperatures of 10–30°c. This was mainly due to the quick formation of a protective layer of corrosion products at the higher temperatures. Moreover, the protectiveness of these layers app…
Partial Discharge Testing under Direct Voltage Conditions
DC partial discharge (PD) (corona) testing is performed using a multichannel analyzer for pulse storing, and data is collected during increase of voltage and at quiescent voltage levels. Thus high voltage ceramic disk capacitors were evaluated by obtaining PD data interspersed during an accelarated life test. Increase…