Chain orientation and crystallization
Abstract
Materials Literature
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Additive Interference in Dibenzyl Disulfide Extreme Pressure Lubrication
A series of very simple radioactive chemical tests has been carried out to measure reaction of dibenzyl disulfide on steel. By comparing the results with friction experiments under the same conditions, some of the requirements of extreme pressure lubrication have been determined. Current views on the mechanism of reac…
Polyphosphazene elastomers
Abstract Poly (dichlorophosphazene) rubber was discovered eighty years ago. Its rapid hydrolysis in moist air has hitherto precluded applications. The polymer was intractable and could not conveniently be modified chemically until Allcock (1965) reported that a soluble form could be obtained by careful control of the…
The pseudo-spin model and its application to KDP-type materials
The applicability of the pseudo-spin model is discussed in relation to the existence of constituents with a restricted number of low-lying energy states. The situation certainly occurs in materials with low-lying electronic levels which undergo co-operative Jahn-Teller phase transitions. The Slater-Takagi model of KDP…
Discharge Behavior of Li∕MoO[sub 3] Cells
Abstract not Available.
Biomechanical and Biochemical Changes in the Periarticular Connective Tissue During Contracture Development in the Immobilized Rabbit Knee
The progressive rabbit knee joint stiffening resulting froin immobilization was studied using biomechanical and biochemical methods. Consistent trends of increase in joint stiffness and decrease in water and total hexosamine content in the periarticular connective tissue were seen as the time of immobilization increas…
METAL COMPLEXES OF PORPHYRINLIKE COMPOUNDS AS HETEROGENEOUS CATALYSTS
It is generally accepted nowadays that catalysis occurring at the surface of a metal compound, such as an oxide or a sulfide, can be described in terms of the properties of the. metal ions, surrounded by ligands, on the surface of the catalyst. It is one of the attractions and also the challenge of catalytic research…
Measurement of the top bottom effect in scanning transmission electron microscopy of thick amorphous specimens
Summary In Scanning Transmission Electron Microscopy (STEM) details at the top of thick specimens can be imaged with a better resolution than those at the bottom, because the scanning electron probe is broadened by multiple scattering. For quantitative measurement we used a test specimen consisting of a substrate film…
Separation and Purification Methods
Abstract not Available.
Pyrroles and related compounds. Part XXXIII. Total synthesis of deuteriated derivatives of protoporphyrin-IX for nuclear magnetic resonance studies of haemoproteins
In order to settle the precise identity of certain resonances in the paramagnetic n.m.r. spectra of low-spin haemoproteins, a variation of the MacDonald approach to porphyrins from pyrromethanes has been developed and applied to the synthesis of protoporphyrin-IX dimethyl ester (1a) and its 5,8-bis(trideuteriomethyl)-…
Metallurgical appraisal of wear mechanisms and processes on high-speed-steel cutting tools
The wear mechanisms and processes on high-speed-steel tools used to machine steels, cast iron and a nickel-based alloy under conditions encountered in practice have been investigated. Evidence is presented of five different wear processes: (a) superficial plastic deformation by shear at high temperature; (b) plastic d…
The Temperature and Compositional Dependence of the Electrical Conductivity of Nonstoichiometric CeO[sub 2−x]
The electrical conductivity of sintered specimens of nonstoichiometric was measured as a function of temperature from 1000°−300°C and composition from . These results are described in terms of a high temperature and low temperature region. In both temperature regions the conductivity for fixed values of x exhibits an…
Electrically conducting metal dithiolate-perylene complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrically conducting metal dithiolate-perylene complexesLuis Alcacer and August H. MakiCite this: J. Phys. Chem. 1974, 78, 3, 215–217Publication Date (Print):January 1, 1974Publication History Published online1 May 2002Published inissue 1 January 1974https://pubs.acs.org/…
Infra-red study of nitric oxide adsorption on magnesium oxide
An i.r. study of nitric oxide adsorption on high area MgO (previously degassed at 800°C) at room temperature is reported. The adsorption of NO onto MgO produces i.r. bands at 800–900 cm–1, 1100–1250 cm–1, and 1350–1450 cm–1. These absorption bands were assigned to several surface species: NO–2 ions with various config…
A positron annihilation study of the annealing of, and void formation in, neutron-irradiated molybdenum
Positron annihilation has been used in a study of the annealing of molybdenum irradiated at 60°C to the low dose of 1·5 × 1018 fast neutrons cm−2. On the basis of changes observed in positron lifetimes and intensities, it was possible to identify the defect mechanisms responsible for the various annealing stages. In p…
The critically branched state in a covalent synthetic system and in the reversible gelation of gelatin
The critically branched state of matter (close to a gel point) is further explored theoretically and experimentally. Fluctuations and effects due to cutting the high molecular weight tail of the distribution are examined in terms of asymptotic formulae derived from the Flory-Stockmayer distribution for random ƒ-functi…
Photoelektronenspektren und Moleküleigenschaften, XXVII. Chlor‐ und Bromäthylene — Beispiele für Änderungen in π‐ und σ‐Systemen
Abstract Die Photoelektronen (PE)‐Spektren der mono‐ und disubstituierten Chlor‐ und Bromäthylene zeigen bis zu 9 isolierte Banden. Die Zuordnung anhand qualitativer MO‐Modelle wird durch Spektrenvergleich, Perfluor‐Effekte und Schwingungsfeinstrukturen gesichert. Aus den zugeordneten Spektren lassen sich MO‐Parameter…
Metal Particle Size Determination of Supported Metal Catalysts
The variety of supported metal catalysts utilized in the operations of the petroleum and chemical industries emphasizes the importance of metal-catalyzed reactions. As a result, many scientific investigators have attempted to characterize and follow closely the changes in the crystallite size and shape of supported me…
Optical Anisotropy of Nematic Compounds
The calculation of the principal polarizabilities of nematic compounds with reference to the two approaches using either the Vuks formulae or the Neugebauer's relations is discussed. The polarizabilities and internal field constants have been calculated from the birefringence data in the nematic phase of seven compoun…
The SPE international award address—1973 the development of impact polystyrene–a review
Abstract The development of impact polystyrene and types of processes used is traced from its inception. Our accidental discovery of the process has resulted in the process being termed unique in that no other commercial polymerization has a like phenomenon that occurs in the shearing agitation step. The prior art and…