Materials Literature
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Abstract— Ultraviolet irradiation of 14 C‐uracil in aqueous solution results in the formation of hydrate and dimer photoproducts. The rate of dimerization increases with increasing uracil concentration, and decreases with increasing concentration of oxygen in solution. The kinetics are in agreement with a model previo…
Abstract The spherulitic growth rate of isotactic polystyrene has been measured in a wide range of temperature by means of a polarizing microscope provided with a hot stage. It was possible to fit the experimental data to theory by choosing a value of 75 for the constant C 2 of the WLF equation. The growth rate parame…
The presence of a stationary crystal in a rotating liquid gives rise to a stationary liquid cell beneath the crystal as predicted from the Taylor-Proudman theorem. Outside this cell, the liquid rotates as an almost solid body, while inside the cell it is shown that a predictable inner flow must arise. The effects of c…
Various anomalous magneto-optic and magnetic properties of Eu 1- x Gd x Se are explained on the magnetic exciton and the magnetic impurity state model. It is shown that the optically active magnetic exciton with the lowest energy is of the type of (5 d –5 d ), that is, 5 d character on the central Eu 3+ and also 5 d o…
Abstract In Bacillus subtilis a series of four enzymes is responsible for the degradation of l-histidine to ammonia, formamide, and l-glutamic acid. The third enzyme of the series was not investigated; the other three enzymes, histidase, urocanase, and formiminoglutamate hydrolase, are induced by l-histidine and repre…
The spectra emitted from N2-doped rare-gas solids at low temperatures, irradiated with x rays, have been investigated in detail. The molecular N2 emission seen in the spectral range 2300–5000 Å consists of the Vegard–Kaplan (VK) A 3Σu+ → X1 Σg+ and the second positive C 3Πu → B 3Πg band systems. The latter is observed…
Abstract A method was developed for the study of starch retrogradation by differential thermal analysis. The kinetics of the crystallisation process were studied using the expression θ8 = exp (‐ kt n ), where θ = the fraction of crystallisable starch remaining uncrystallised at time t. The values for the Avrami expone…
The absolute Seebeck coefficient, electrical resistivity, and thermoelectric figure of merit have simultaneously measured on Bi 97 Sb 3 and Bi 90 Sb 10 alloy single crystals of various orientations between 77°K and 300°K. Under the assumption of independent three valley bands for both the valence and conduction bands,…
A high-temperature x-ray study of pure iron has shown that a small, but easily detectable, lattice parameter anomaly, representing a decrease in the mean linear thermal expansion coefficient, occurs over a narrow range of temperature (similar 35 degc) about the Curie point. The total volume change associated with the…
The eutectic and solidus temperatures of the PbTiO 3 ‐KF binary system were investigated by DTA for four compositions. Optical studies of crystal habit as a function of crystallization conditions were used to determine favorable conditions for growing PbTiO 3 crystals from a KF flux. Results of X‐ray studies of these…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelation between the photochemical reactivity and the nature of excited states of acetophenone and substituted acetophenonesN. C. Yang and Ruth L. DusenberyCite this: J. Am. Chem. Soc. 1968, 90, 21, 5899–5900Publication Date (Print):October 1, 1968Publication History Publ…
Measurements of the diffusion of 64Cu in pure and impure α and γ iron show a large discontinuity in the Arrhenius plot of the lattice diffusion coefficient at the α-γ transformation, contrary to the data of Anand and Agarwala [J. Appl. Phys. 37, 4248 (1965)]. Grain-boundary diffusion predominates at T≤815°C in the α p…
The assignment of the 71 cm−1 band in the infrared spectrum of polyethylene to the B1u translational lattice vibration has been confirmed by dichroism studies on an a-axis oriented sample. This permits confident use of the Tasumi-Krimm calculations for the dependence of this frequency of unit-cell parameters. The resu…
A P, v, T equation of state is theoretically constructed for polyethylene of arbitrary crystallinity. This is done by constructing, separately, equations of state for purely crystalline and purely amorphous polyethylene and then combining the two according to the degree of crystallinity. Very little experimental data…
Proceedings of the Fourteenth National Conference, 1966, 447 pp. Price, $20.00 Also Proceedings of the Fifteenth National Conference, 1967. 489 pp. Price $21.50
Progress of Theoretical Physics Vol. 41 No. 3 (1969) pp. 705-722 Interaction between Clusters and Pauli Principle Sakae Saito Progress of Theoretical Physics Vol. 42 No. 3 (1969) pp. 555-580 Alpha-Cluster plus 16O-Core Model for 20Ne and Neighboring Nuclei Jun Hiura, Yasuhisa Abe, Sakae Saitō and Osamu Endō Progress o…
Recent electrical resistivity measurements have shown that the hexagonal form of stoichiometric NiS exhibits an abrupt metal-to-semiconductor transition at 264\ifmmode^\circ\else\textdegree\fi{}K. Neutron diffraction studies have shown that a first-order paramagnetic-to-antiferromagnetic transition also occurs at 264\…
Abstract The dehydration of alcohols on γ‐aluminum oxide, which yields water, olefins, and/or ethers, was studied with the aid of kinetic methods and IR spectroscopy. The unimolecular olefin formation probably proceeds via a surface compound, in which an alcohol molecule is joined by two angular H‐bonds to an OH group…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTADSORPTIVE BUBBLE SEPARATION METHODS—Foam Fractionation and Allied TechniquesRobert. LemlichCite this: Ind. Eng. Chem. 1968, 60, 10, 16–29Publication Date (Print):October 1, 1968Publication History Published online1 May 2002Published inissue 1 October 1968https://pubs.acs.or…
Samples of very low molecular-weight fractions of isotactic polypropylene have been crystallized by means of a solvent-evaporation technique as well as by melt recrystallization. The crystalline entities obtained by these methods have been examined in terms of their internal structure and associated morphology. The pa…