Clay and Clay Minerals
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
Materials Literature
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Effect of Pauli Principle in Scattering of Two Clusters
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…
Metal-to-Semiconductor Transition in Hexagonal NiS
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\…
Dehydration of Alcohols on Aluminum Oxide
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…
ADSORPTIVE BUBBLE SEPARATION METHODS—Foam Fractionation and Allied Techniques
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…
Crystallization of Low-Molecular-Weight Polypropylene Fractions
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…
Effect of Nature of Surfaces on Wetting of Sapphire by Liquid Aluminum
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…
Metabolism of poly(β-hydroxybutyrate). I. Purification, composition, and properties of native poly(β-hydroxybutyrate) granules from Bacillus megaterium
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…
Photo- and thermochromic transients from substituted 1',3',3'-trimethylindolinobenzospiropyrans
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 Glass Capillary Columns
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…
Birefringence of native cellulosic fibers. I. Untreated cotton and ramie
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…
Direct Basal-Plane Shear in Single-Crystal Graphite
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.…
Mechanisms for Metal-Nonmental Transitions in Transition-Metal Oxides and Sulfides
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…
Anomalous Transport Phenomena in Eu-Chalcogenide Alloys
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.…
Intrinsic stacking faults in body-centred cubic crystals
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…
Stereochemical criteria for polypeptides and proteins. V. Conformation of a system of three linked peptide units
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…
Band Structure and Electrical Conductivity of NiO
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.
Exciton-Magnon Interaction in Magnetic Insulators
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.…
Evidence of Coupling Between One- and Two-Phonon Excitations in Quartz
We have extended earlier work on the Raman spectrum of quartz to both higher and lower temperatures (6-900\ifmmode^\circ\else\textdegree\fi{}K), and find evidence for the assignment of features in the 130- to ${200\ensuremath{-}\mathrm{c}\mathrm{m}}^{\ensuremath{-}1}$ region as second order. Anomalies in the temperatu…
Effect of Pressure on the Metal-Nonmetal Transition and Conductivity ofFe3O4
It was recently suggested that the metal-nonmetal transition which occurs in ${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$ at \ensuremath{\simeq}120\ifmmode^\circ\else\textdegree\fi{}K may be of the Mott-Wigner type. Present results on the effects of pressure on the transition temperature and the conductivity of the low-tempe…