A Low Temperature, High Yield Synthesis of Carbon Selenide Sulfide
On peut preparer CSSe en 2 ou 3 etapes a partir de chlorure de N,N-dimethylthiocarbamoyle avec un rendement de 54 a 58% et une purete de 99,5%
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Coupling of Sliding and Migration in Coincidence Boundaries of Zn and Al Bicrystals and their DSC Dislocation Models
Grain boundary sliding behavior was investigated in coincidence boundaries of Zn and Al bicrystal specimens, in order to demonstrate the applicability of the DSC dislocation model. Two coincidence boundaries, viz. a 〈10\bar10〉 symmetric tilt boundary with a {1\bar216} boundary plane in Zn and a 〈1\bar10〉 symmetric til…
Ion Bombardment Damage in a Modified Fe-9Cr-1Mo Steel
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…
LABORATORY EVALUATION OF FOUR RAPID-SETTING CONCRETE PATCHING MATERIALS
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…
Analysis of high frequency magnetic properties of compressed iron powder cores.
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…
Thermodynamics of vaporization of fission products and materials under severe reactor accident conditions
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).
Electron microscopy and diffraction of modulated structures
Abstract
Actinocyclus ingens Rattray: Reinvestigation of a Polymorphic Species
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 chemical reactions of hydrogen in silica glass optical fibers
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…
Symmetries in texture analysis
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.
Chemical Reaction Dynamics in Solution
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, Pb10Bi3As3S19, une nouvelle espèce minérale homologue de la jordanite
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, a new mineral from the Tanohata mine, Iwate Prefecture, Japan.
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…
Considerations for Thermal Stability of Oil Impregnated EHV Condenser Bushings
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…
The crystal structure of synthetic natrotantite
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…
Effects of Strain Rate on the Tensile Behavior of Stainless Steels, Copper, and an Aluminium Alloy at Cryogenic Temperatures
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…
Stickstoffhaltige siliciumorganische Verbindungen. CXIX. Synthese der cyclischen siliciumorganischen Ester von Diethanolaminen
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…
Roles of H 2 S in behaviour of engineering alloys
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…
Some evidence for the existence of the liquid‐liquid transition: Melt rheology studies
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°…
Role of chromia in copper catalysts for dehydrogenation of ethanol
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…