Materials Literature
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Visually smooth and adherent deposits of molybdenum have been obtained electrolytically on a copper, a nickel, a stainless steel and a molvbdenum substrate in a KF–B2O3–Na2MoO4 fused salt at temperatures of 1023–l173 K and current densities of 110–1880 A/m2 with a molybdenum and a graphite anode.
The research imperatives in composites containing natural fibres, such as sisal and sunhemp, and certain agro-wastes like rice husk, corn and peanut shell, are discussed. These materials are classified into two categories: (i) particulate, and (ii) fibrous types of fillers. This paper highlights the economics of using…
It is an important and fundamental study in paleoecology to examine accurately the distribution and ecology of living assemblages. In the case of diatoms, however, living assemblages have been unalbe to be selected from the total assemblages including dead cells.Hematoxylin and Eosin stain which is in general use to o…
Silicon crystals have been grown under axial magnetic fields of up to 0.2 T. At 0.05 T the field starts to interact with the melt and dopant incorporation becomes erratic. As the field is increased to 0.2 T the interaction becomes more controlled and it is seen that the effective distribution coefficient (keff) moves…
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%
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…
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…