Materials Literature
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Abstract Es wird ein kurzer Überblick über die Grundvorstellungen der Theorie des Parakristalls und ihre Anwendung in der Röntgen‐Feinstrukturanalyse gegeben. Weiterhin werden die Beziehungen erörtert, die zwischen der Theorie des Parakristalls und den Flüssigkeitstheorien von O RNSTEIN , Z ERNIKE und Z ERNIKE , P RIN…
The time needed to reach the glass transition temperature, at a constant cooling rate, with a small enough crystallized fraction (less than 10–4) is used as a criterion for glass-forming ability. In order to compute this cooling time, the rates of nucleation, growth and cooling have been coupled together in a kinetic…
Strain aging in 0·2C–Mn steels is eliminated by the addition of 0·02−0·03% Ti which is approximately the stoichiometric addition for steels containing 0·005−0·006%N. This critical amount of titanium also increases the Lüders strain and decreases the impact transition temperature of these reinforcing steels. It is sugg…
Abstract Condensation polymers were prepared from the pentaerythritol acetal of methyl 9(10)‐formylstearate by reaction with diamines and with ethylene glycol. The glycerol acetal was self‐condensed to a poly(ester‐acetal) and also copolymerized with caprolactam. A novel step growth, addition polymerization was carrie…
Pitting problems have been encountered in titanium tubes in heat exchangers handling hot saturated brines. These pits appear to be of two types. One type results in symmetrical holes about one-fourth inch diameter. These are associated with scratches in which iron is found to have been smeared into the titanium surfac…
Recent work on the relationships between catalytic reactions on metallic single crystals and the physical properties of the surfaces is reviewed. Striking advances have been achieved in this area of surface science with regard to structure sensitivity, adlayer effects on activity and selectivity, the collision dynamic…
Light fading of some typical sulfonated acid wool and direct cotton dyes has been assessed, visually against the blue standards, on cotton, wool, silk, and anodized aluminum, and spectrophotometrically in films of regenerated cellulose and gelatin, at various respective relative humidities of the surrounding atmospher…
Abstract
1. Two carbons, carbon-2 and one of carbons-3 to -5, of lysine seemed likely to be incorporated into one of carbon of the chromophore moiety of formycin. 2. From the results of radioisotopic studies with glutamate, gamma-amino-n-butyrate or organic acids related to tricarboxylic acid cycle, the important role of gluta…
The crystal structure of the title compound has been redetermined from three-dimensional neutron diffraction data with 511 reflections. Z= 4 in the monoclinic space group C2/c, with cell dimensions a= 1 248.3(6), b= 749.9(4), c= 720.8(3) pm, β= 91.21(2)°. The structure was refined by full-matrix least-squares in the c…
Copper-10 at% aluminum alloy single crystals with tensile axes in the [001], [112], [111], [212], [101], and [102] directions were extended in the temperature range between −195 and 800°C. Yield stresses resolved on the active slip systems were almost independent of crystal orientation below 400°C. Rotation of the ten…
Samples of tinplate passivated by a cathodic dichromate treatment have been analysed by photo-electron spectroscopy to determine the nature of the chromium on the surface. This has confirmed the presence of chromium metal which appears to be present in discrete regions rather than as a continuous film. The entire surf…
(1976). Adsorption of Mn2+, Zn2+, Cd2+ and Hg2+ from Binary Solutions by Mineral Material. Acta Agriculturae Scandinavica: Vol. 26, No. 4, pp. 243-250.
The crystal structure of celsian from Jakobsberg, Sweden, (Bao rrKo ouAl, 5Si2 ouO, a : 8.622,b: 13.078, c-- 14.4ll A,B: ll5.09,spacegro up 12/c)hasbeenrefi nedusing528.a' reflections (h-t k even, / even ) and 2'72'b' , reflections (h+ k odd, / odd) > 16. The 'b' reflections were measured at one-quarter the rate of'a'…
The need for random-numbers in simulation in nuclear physics, communications, risk theory, queue systems, industrial organization and many other related and similar topics is beyond question. Sooner or later the calculation part of these problems grows beyond human powers and a computer has to be involved. When using…
A new method for Monte Carlo electron transport calculations has previously been outlined. Briefly, the method is as follows: the quantity of interest (e.g., x-ray photoemission angular distribution) is expanded in a complete set of orthogonal functions; the individual trajectories of the Monte Carlo sample are used t…
New unstable photoisomers absorbing of short wavelengths were observed for 10,10′-dimethyl-Δ9,9′-biacridanylidene, bithioxanthenylidene, bianthrylidene, and 10.10′-dihydroxybianthrylidene. A C2v symmetry structure, considerably twisted about the four single bonds of the 9,9′-ethylene unit is suggested by a CFF–π elect…
Formation and growth of modulated structure with aging were investigated for Ni-37 at%Cu-8 at%Si and Ni-30 at%Cu-5 at%Si alloys which show a typical modulated structure, by means of transmission electron microscopy, X-ray diffraction and electrical resistivity measurements. The results obtained are as follows: (1) For…
1 Method by electric wire
The infrared, Raman and n.q.r. (14N and 35Cl) spectra of the 1:1 molecular complex of 3,5-dichloropyridine with iodine monochloride are reported. All three 14N transition frequencies were obtained at 77 K using a double resonance technique. The resulting 14N coupling constant and asymmetry parameter are 2.257 MHz and…