Nomenclature of carotenoids (rules approved 1974)
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Materials Literature
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Carbon‐13 NMR spectra of some polychlorinated telomerisation products
Abstract The study of 28 specially selected compounds containing chlorine shows that 13 C NMR signals of the CCl 3 , CCl 3 CH 2 and CH 2 Cl groups are registered in the ranges of 93 to 105, 49 to 71 and 38 to 59 ppm (from TMS), respectively and are readily identified in 13 C NMR spectra of polychloro compounds. The we…
Magnetic susceptibility and magnetization of the ionic ferromagnets dipotassium, dirubidium, and dicaesium tetrachlorochromate(II)
High-temperature (300–80 K) susceptibility data are reported for polycrystalline samples of the ionic ferromagnets M2CrCl4(M = K, Rb, or Cs) and interpreted using the high-temperature series-expansion method for the quadratic-layer Heisenberg S= 2 ferromagnet to yield estimates of 7·0, 8·5, and 6·5 cm–1 for the neares…
Mechanism of peroxidation of solid polymers as derived from the kinetics of the induced graft copolymerization
Abstract Grafting of acrylonitrile onto various radiation peroxidized polymers was used as a technique to investigate the peroxidation mechanism. It was found that in polymers such as polypropylene, poly(vinyl chloride), and polystyrene, a chain hydroperoxidation process only occurs above the glass transition temperat…
Cluster calculations of the electronic d-states in VO2
An ab-initio cluster calculation of the electronic d-states in VO 2 has been made by using the self-consistent statistical exchange multiple scattering method. A VO8-6 octaedron was used to represent the tetragonal phase, and a V2O12-10 cluster with paired vanadium atoms was used for the monoclinic phase. Our results…
The liquidus curve in the system Al2O3-Ga2O3 as measured with a solar furnace.
[in Japanese]
Analyse radiocristallographique de la distorsion magnétostrictive dans les antiferromagnétiques KCof3, RbCof3 et TlCof3
Un cryostat à hélium liquide a été adapté sur un goniomètre à rayons X afin de permettre la mesure continue des paramètres cristallins de 4 K à 300 K. Une distorsion quadratique (c/a < 1) est mise en évidence dans plusieurs pérovskites fluorées du cobalt ; elle apparaît à 117 K dans KCoF3, 101 K dans RbCoF 3 et 94 K d…
Dynamics of s =1/2 disclinations in twisted nematics
Declination lines separating regions with opposite twist in a twisted structure of a nematic liquid crystal are studied theoretically and experimentally. A particular study is made of magnetic-field induced motions of the disclination lines. Comparison of theoretical and experimental results leads to an estimate of th…
Multiplet structure in X-ray photoelectron spectra of rare earth elements and their surface oxides
A systematic study has been made of the valence bands and core-level peaks in X-ray photoelectron spectra of the heavy rare-earth metals and their surface oxides. Multiplet structure observed in the 4d levels is reported here. This structure alters on oxidation, and in addition the 4d peaks broaden and exhibit shifts…
Electromechanical response of PZT 65/35 subjected to axial shock loading
This theoretical and experimental investigation deals with the electromechanical response of a shock−loaded ferroelectric ceramic material. Quartz gauge and voltage−mode techniques were used to characterize the mechanical and electrical responses, respectively, of PZT 65/35 to ≈80 kbar. Below ≈20 kbar the wave propaga…
Thermal decomposition of isopropanol
The pyrolysis of isopropanol has been investigated at temperatures in the range 721–801 K and pressures between 10 and 100 Torr, using a KCl-coated silica reaction vessel. Under these conditions the reactions occurring were essentially homogeneous and, for reaction times corresponding to < 30 % conversion, led to the…
Electronic structure of the oxides of lead. Part 1.—A study using X-ray and ultraviolet photoelectron spectroscopy of the oxidation of polycrystalline lead
HeI and HeII spectra of clean polycrystalline lead are reported and discussed. The oxidation of this polycrystalline lead foil by both ground-state molecular and microwave-excited oxygen has been studied using UPS and XPS techniques in combination in the same apparatus. Work function changes were also measured. The in…
Crystal transformation and orientation of Mn-Al-C hard magnetic alloy
An anisotropic polycrystalline magnet of a Mn‐Al‐C alloy with (BH) max=6 MG⋅Oe has been successfully produced by extrusion at about 700°C. During the study on this ternary alloy system, a ferromagnetic phase (τ‐phase) single crystal was obtained by annealing a high‐temperature phase (ε‐phase) single crystal containing…
Effects of mechanical grinding on the texture and structure of calcium carbonate
Continuous grinding of CaCO3 does not lead to continuous increases in the surface area, but causes it to pass through successive minima and maxima. In spite of its technological significance, this phenomenon has not yet been interpreted.The present work attempts to clarify this problem. We demonstrate that mechanical…
A wet stage modification to a scanning electron microscope
A modification to the vacuum system of a JSM2 scanning electron microscope has enabled hydrated specimens to be placed inside the specimen chamber of the instrument and to be surronded by water vapour at a pressure up to approximately I 3-kPa (10 Torr). The surface topography was observed by detecting the backscattere…
SKIN GRAFT SURVIVAL ON AVASCULAR DEFECTS
Full-thickness skin grafts placed on bare rabbit ear cartilage were revascularized, whereas split-skin grafts on the same kinds of areas failed. The contrast is most likely due to differences in the skin graft thickness and the vascular patterns in the grafts. Full-thickness rat skin grafts placed over the same sized…
The Effects of Hydrostatic Pressure on the Compressibility, Crystallization, and Melting of Polymers
Hydrostatic pressure has been known for quite some time to affect the physical and mechanical properties, to help create or synthesize new or known materials, and to enhance the formability of various metals and geological materials [1–19]. Although polymeric materials are far more susceptible to hydrostatic pressure…
Stereology: methods for quantitative light and electron microscopy.
There are available to the biologist sophisticated methods for the quantitative determination of many structural parameters of tissues; the methds are covered by the term stereology and are based on statistical sampling techniques introduced by geologists and materials scientists. Methods for determining the volume fr…
Physicochemical characterization of some fully aromatic polyamides
Abstract The characterization of eight fully aromatic polyamides are described with the procedures required to yield film‐ and fiber‐forming materials. Solutions of these aromatic polyamides in dimethylacetamide were characterized by NMR and the effects of dissolved lithium chloride on these spectra investigated. The…
Polymerization of Hexachlorocyclotriphosphazene. The Role of Phosphorus Pentachloride, Water, and Hydrogen Chloride
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of Hexachlorocyclotriphosphazene. The Role of Phosphorus Pentachloride, Water, and Hydrogen ChlorideH. R. Allcock, J. E. Gardner, and Karen M. SmeltzCite this: Macromolecules 1975, 8, 1, 36–42Publication Date (Print):January 1, 1975Publication History Publishe…