Materials Literature
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A normalized-and-tempered Fe-9Cr-1Mo steel, modified with small quantities of niobium and vanadium, was bombarded with 4 MeV iron ions to a nominal displacement level of 100 displacements per atom (dpa) at temperatures of 400, 450, 500, 550, and 600°C. The major microstructural damage feature created in the lathlike α…
Many proprietary patching products are available for the repair of portland cement concrete (PCC) pavement. These materials must cure rapidly to minimize delay and limit safety hazard exposure to both the traveling public and maintenance personnel. However, long-term strength and durability are equally important, alth…
In order to clarify the factors determining the high frequency magnetic properties of compressed iron powder cores, complex permeability was calculated and compared with measured values.Permeability at lower frequencies depends on the intrinsic permeability, effective demagnetization coefficient and packing fraction o…
Article Thermodynamics of vaporization of fission products and materials under severe reactor accident conditions was published on January 1, 1985 in the journal Pure and Applied Chemistry (volume 57, issue 1).
Abstract
Rattray described the marine fossil diatom Actinocyclus ingens as having an undulating valve with a concentric elevation around a central depression. Two other valve types are also observed in this species: a flat valve and a different undulate form that has a convex center. Apparently, these valve types may be arrang…
Loss increases due to the chemical reactions of hydrogen are investigated for GeO2-doped, GeO2. F-doped, and pure silica core fibers. Dissolved hydrogen gas causes the hydroxyl loss increase as well as the short-wavelength loss increase in the first two fiber types at high temperatures. The short-wavelength loss incre…
It is shown that a comprehensive symmetry description in polycrystalline bodies needs black-white point groups rather than the usual (one-colour) groups that are sufficient for single crystals.
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
La kirkiite a été découverte dans le gisement à Pb-Zn de Saint-Philippe, près de Kirki (Thrace, Grèce). Elle est associée à la cosalite, la bismuthinite, la jordanite bismuthifère, la galène et la séligmannite, dans un mélange de sphalérite et pyrite. L'analyse à la microsonde donne : Pb = 59,4 ; Sb = 0,5 ; Bi = 15,2…
Natronambulite, (Na, Li)(Mn, Ca)4Si5O14OH(Na > Li; Mn > Ca) is triclinic, P1 or P-1, a = 7.620, b = 11.762, c = 6.737Å, α = 92.81°, β = 94.55°, γ = 106.87°, Z = 2. The electron microporbe and wet chemical analyses gave SiO2 50.39, TiO2 0.03, FeO 0.31, MnO 38.94, MgO 1.24, CaO 3.66, Na2O 3.55, Li2O 0.43, H2O+ 1.46, H2O…
The equilibrium of dielectric losses and I2R losses with temperature are an important consideration for EHV bushings. A predictive equation is developed on the assumption of radial heat flow which defines critical voltages for thermal stability. Analysis indicates that thermal stability tests should be performed with…
Ideal natrotantite has the composition Na2Ta4O11, space group R-3c, a = 6.2092(1), c = 36.619(1) Å, Z = 6. The structure of synthetic natrotantite has been refined by the Rietveld method to Rp = 8.67, Rwp = 9.24, RB = 2.33 % using X-ray powder diffractometer data. The structure consists of layers of (l) edge-sharing N…
By inserting small thermocouples inside the tensile specimen, temperature rise during straining and its relation to stress-strain behavior have been investigated for SUS304L and 310S stainless steels at various strain rates between 3.3×10-2s-1 and 3.3×10-5s-1, at 4K and 77K. OFHC copper and 2024 duralumin having quite…
Abstract Es wird über Darstellung und charakteristische Merkmale von 41 neuen cyclischen siliciumorganischen Estern von Diethanolaminen — 1, 3‐Dioxa‐6‐aza‐2‐silacyclooctanen — berichtet. Neun verschiedene Verfahren zu ihrer Gewinnung wurden untersucht, darunter auch die in dieser Arbeit zum ersten Mal beschriebenen. E…
Hydrogen sulphide has long been associated with causing weight-loss corrosion, blistering, and sulphide stress cracking in low-alloy steels used in oil and gas production. In recent years, new stainless and nickel alloys have been proposed for use in many oilfield applications where corrosion in production environment…
Abstract In 1963 Boyer proposed the existence of a liquid‐liquid transition, T ll , in polystyrene above the glass transition T g . Since that time there has been considerable discussion and disagreement on the existence of this transition. Detailed shear modulus data as a function of temperature in the range 165–215°…
Abstract During direct vapour phase dehydrogenation of ethanol, a copper‐on‐silica catalyst lost much of its activity in 100 h. Analysis with X‐ray diffraction, scanning electron microscopy and X‐ray photoemission showed that both sintering and carbon deposition accompanied the drop in activity. In catalysts in which…
An investigation has been carried out into the development and maintenance of wear-protective oxide on iron-12 per cent chromium-base alloys during sliding in air at 20–600°C, with particular reference to the effects of temperature, of intermittent changes in temperature, and of sliding speed. It has been established…
Abstract The behaviour of a polypyrrole‐modified electrode in an aqueous 0.5 M HCl solution at high anodic potentials was studied. Electrochemical experiments and 13 C‐NMR analysis showed a decrease in conductivity, due to the formation of CCl bonds in the pyrrole ring structure.