Materials Literature
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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…
Contact angles of aluminum drops on sapphire measured under vacuum conditions from 660° to 1250°C generally fell into three ranges. Large obtuse contact angles indicating interfacial energies greater than either of the two surface energies were obtained up to about 900°C; van der Waals bonding then existed at a compou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetabolism of poly(β-hydroxybutyrate). I. Purification, composition, and properties of native poly(β-hydroxybutyrate) granules from Bacillus megateriumR. Griebel, Z. Smith, and J. M. MerrickCite this: Biochemistry 1968, 7, 10, 3676–3681Publication Date (Print):October 1, 196…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhoto- and thermochromic transients from substituted 1',3',3'-trimethylindolinobenzospiropyransJohn B. Flannery Jr.Cite this: J. Am. Chem. Soc. 1968, 90, 21, 5660–5671Publication Date (Print):October 1, 1968Publication History Published online1 May 2002Published inissue 1 Oc…
A static coating procedure for open tubular (capillary) columns in glass is described and the performance of the column is compared with that of commercially available open tubular columns. Conventional coating efficiencies of 30 to 85% of the maximum possible value are attained in glass capillary columns. This is bet…
Abstract The Rayleigh‐Gans theory of light scattering by a homogeneous cylinder has been applied to the case of scattering by a pad of fibers immersed in a liquid. The theory enables one to locate precisely the matching wavelength at which the mean refractive index of a sample of optically heterogeneous fibers coincid…
The basal-plane shear stress-strain behavior of small, highly anisotropic-annealed natural graphite single crystals was studied at room temperature. A static uniaxial-shear stress was applied directly along the basal plane with a minimum of normal force, incorporating a technique to detect translations down to ∼40 Å.…
Transition-metal oxides and sulfides can be insulators, semiconductors, or metals, or undergo metal-nonmetal transitions. The experimental situation in these materials is briefly reviewed. Pure Bloch-Wilson theory predicts that many of the insulators should be metallic, so this class cannot be explained in terms of pu…
Various anomalous optical, magnetic, and transport phenomena have been found in Eu-chalcogenide alloys. Anomalous optical properties are explained by the magnetic exciton in which a hole in the $4f$ conduction band and an electron (for optically active magnetic exciton) in the $5d$ conduction band make a bound state.…
A study of the possibility of the existence of stacking faults in b.c.c. crystals on {110} and {112} planes has been performed, representing the lattice by a central force interaction between atoms. The same study was also carried out for {111} planes in f.c.c. crystals. The results for the f.c.c. lattice are in full…
Abstract The general conformations of a system of three linked peptide units are studied, and it is found that there are three types of conformations which contain NH…O hydrogen bonding between the first and the third units. One of them is part of a 3 10 ‐helix, while the other two arc nonhelical. The two nonhelical c…
It is proposed that the dominant mechanism for electrical conduction in NiO and similar materials is by means of holes in the oxygen $2p$ band. A band-structure diagram which takes into account the primarily localized $3d$ states is suggested.
The one-exciton, one-magnon system is treated for a suitable antiferromagnetic insulator, Mn${\mathrm{F}}_{2}$. Zone-edge excitons and magnons are found to interact quite strongly. Bound states are found to exist under favorable circumstances. The line shapes of magnon sidebands of excitonic transitions are modified.…