Materials Literature
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In-pile fission gas release from nearly stoichiometric sintered uranium monocarbide was measured in the temperature range from 1,650° to 2,030°C. The result was analyzed on the basis of the diffusion model, from which the diffusion coefficient of krypton in uranium monocarbide was derived as D=1.6×10−7 exp(–56,400/RT)…
Abstract Thermomagnetic transport parameters have been measured in bismuth at 80 °K and found to be strongly pressure‐dependent. Results indicate that in addition to a decrease in the energy overlap, E 0 , there is an increased participation of a light hole band increasing the mobility of holes. The Nernst effect and…
Dando seqüência ao estudo do bambu como matéria-prima para as indústrias de celulose e papel, foram determinadas as características tecnológicas de quatro espécies tropicais exóticas, com bom desenvolvimento nas condições ecológicas do Estado de São Paulo. Em cozimentos efetuados pelo processo sulfato constataram-se d…
Abstract An analytical technique based on the method of least squares has been developed to fit experimental second virial coefficients to the functional form derived from the Lennard‐Jones (6–12) potential. Both the functional form and the normal equations of the least squares fit are rigorously derived. Because of t…
Phase relations in the system NaAlSi 3 O 8 – NaAlSiO 4 – H 2 O up to ~15 Kb have been discussed from a theoretical standpoint. The discussion is based on the equilibrium compositions of invariant phases. Two new invariant points, I 5 and I 6 , have been predicted: I 5 at ~13 Kb/~500 °C where five phases, jadeite, neph…
Five anhydrogalactose-containing polysaccharides have been extracted in high yields with hot water and dilute alkali from Gloiopeltis furcata and purified by precipitation with cetylpyridinium chloride and by some chromatographic techniques. The analytical results showed that they all contained galactose, 3, 6-anhydro…
The lattice parameters of UC2 are examined as a function of carbon content and annealing: conditions on sintered carbides between UC1·5 and UC2·2 (7.0 to 10.0W/0 of carbon). The values of UC2 obtained under equilibrium state are around a 0=3.5253 Å and c 0=5.9994Å. The lattice parameter measurements were made also on…
The types of high-voltage direct-current (HVDC) system configuration and the detrmental effects that this type of transmission can have on its surroundings are summarized. Discussed in detail are the test procedures followed and camred out to determine some of the effects on a major pipeline by simulated conditions, f…
The reflection, transmission, optical activity, and extinction ratio of a series of mixtures of cholesteryl oleyl carbonate, cholesteryl nonanoate, and cholesteryl chloride of different proportions were measured. The wavelength of minimum transmission (lambda(o)), maximum rate of change of optical activity, and minimu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of a new ternary lithium silicon nitride, LiSi2N3, and the high-pressure synthesis of magnesium silicon nitride, MgSiN2E. Dow Whitney and Rossman F. Giese Jr.Cite this: Inorg. Chem. 1971, 10, 5, 1090–1092Publication Date (Print):May 1, 1971Publication History Pub…
The in-plane thermoelectric power () of single-crystal graphite in the presence of a magnetic field applied parallel to the c direction was measured at temperatures (T) from 4.2°K up to 300°K. With an increase of the field intensity (H), the sharp negative dip of the versus T diagram previously found to be (0) = −…
The electric strength of polythene has been measured using impulse voltages of differing rise times. The mean value of electric strength increases from 5·6 MV cm −1 for a voltage rise time of 60 μs to 6·6 mV cm −1 when the voltage rise time is 80 μs. The dc strength is 6·4 mV cm −1 . The change in electric strength co…
Laboratory tests were conducted to determine the degradation of dc line and station insulation strength by icing. Curves are presented which relate flashover levels to the degree of icing and the resistivity of the ice, and comparisons are made between the ice test results and fog chamber and wet test data.
Abstract Die Verbindung CaGa 4 O 7 wurde dargestellt und ihre Struktur mit Hilfe von Einkristallen röntgenographisch bestimmt. CaGa 4 O 7 kristallisiert monoklin in der Raumgruppe C C2/c mit den Gitterkonstanten a = 13,06 5 , b = 9,07 9 , c = 5,60 0 Å; β = 105,15°. Ungewöhnlich ist die Sauerstoffkoordination des Calc…
Abstract The photo‐oxidative chain scission of isotactic polystyrene films has been studied as a function of the degree of crystallinity, SO 2 , and NO 2 pressures, and temperature. The rate of chain scission increases in the presence of SO 2 with extent of crystallinity. It is assumed to be faster due to strain in an…
Abstract The rate of adsorption of fractionated polyethylenimine (PEI) from water onto regenerated cellulose fibers was studied as a function of the polymer diffusion coefficient. Differences in polymer molecular weight, salt concentration, and pH were employed to vary the diffusion coefficient which was measured inde…
The thermal diffusivities of dense polycrystalline TiB2, ZrB2, and HfB2 were measured by a laser flash method over the temperature range 200°–1300°C. An investigation of the effects of radial heat flow was performed and a special sample shape was used to comply with the assumption of one-dimensional heat flow. The val…
Abstract A pyrolysis–gas chromatographic technique for measuring the amount of hydrogen chloride released during the high temperature pyrolysis of poly(vinyl chloride) resins, plastisols, copolymers and compounds containing inert fillers has been developed. The technique, which is also applicable to the analysis of ch…
The specific heats of a series of $\ensuremath{\alpha}$-phase Cu-Al and dilute magnetic Cu-Al (Fe) alloys with iron concentrations near 0.07 at.% have been measured over the temperature range 1-14 K. The alloys had aluminum concentrations of 0, 2.5, 5, and 10 at.%. The electronic specific-heat coefficient and the Deby…
The Raman spectra of [ 64 Zn(NH 3 ) 4 ]I 2 and its 68 Zn analog have been measured in the crystalline state. The Zn–N stretching vibrations have been assigned based on the observed metal isotope shifts. These shifts have been compared with theoretical values obtained from a complete normal coordinate analysis on the […