New aspects of the chemistry of nonbenzenoid polycyclic conjugated π-electron systems
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Clay mineralogy of weathering rinds and possible implications concerning the sources of clay minerals in soils
Research Article| July 01, 1982 Clay mineralogy of weathering rinds and possible implications concerning the sources of clay minerals in soils Steven M. Colman Steven M. Colman 1U.S. Geological Survey, Denver Federal Center, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar Geology (1…
Melting temperatures of refractory oxides: Part I
Published Online: 2009-01-01 Published in Print: 1982-01-01 © 2013 Walter de Gruyter GmbH, Berlin/Boston
Hydrolysis of Elemental Sulphur in Water and its Effect on the Corrosion of Mild Steel
The acidity developed by elemental sulphur when mixed with neutral water has been studied by measurements of the variaiion of pH with changes in the ratio of the solid sulphur to water and the effect of the presenece of metallic iron. The results obtained have been shown to extend the data reported at high temperature…
The derivative structure of silicate garnets in grandite
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Irreversibility of cyclic slip in persistent slip bands of fatigued pure f.c.c. metals
Parallel screw dislocations performing cyclic slip are considered. Plastic resolved-shear-strain amplitudes γpl below a certain limit γpl,s can be accomplished by a static dislocation density, i.e. by the reversible to-and-fro motion of the screw dislocations. If γpl ≥ γpl,s, steady-state cyclic deformation requires t…
Combination rules for intermolecular potential parameters. I. Rules based on approximations for the long-range dispersion energy
Combination rules for intermolecular potential parameters based on different approximations for the long-range dispersion energy are derived and applied to the Lennard-Jones (12–6) and Kihara potential functions. The resulting group of rules is given by the expressions σ12 = <σ≳j, and ε12 = <εσ6γ≳i/‖&…
Raman spectroscopic identification of the S4N- and S3- ions in blue solutions of sulfur in liquid ammonia
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectroscopic identification of the S4N- and S3- ions in blue solutions of sulfur in liquid ammoniaT. Chivers and C. LauCite this: Inorg. Chem. 1982, 21, 1, 453–455Publication Date (Print):January 1, 1982Publication History Published online1 May 2002Published inissue 1…
Accumulation of poly-beta-hydroxybutyrate in Spirulina platensis.
Poly-beta-hydroxybutyrate has been identified in the cyanobacterium Spirulina platensis. The addition of reduced carbon compounds to the growth medium was not required for poly-beta-hydroxybutyrate accumulation. Poly-beta-hydroxybutyrate accumulated during exponential growth to 6% of the total dry weight and then decr…
Phase separation in perfluorosulfonate ionomer membranes
Abstract The extent of phase separation in Nafion® perfluorosulfonate ionomer membranes has been studied by small‐angle neutron scattering (SANS). These polymers, which consist of a perfluorocarbon main chain and a sulfonate‐containing side group, can absorb up to 30% by weight of water. Previous studies have shown th…
Converging SCF calculations on excited states
Abstract A practical scheme for the calculation of excited states of the same symmetry as a given reference state is outlined in the context of the Hartree‐Fock method. In order to prevent the excited state from “collapsing” into a lower‐lying state, the prediagonalized Fock matrix is diagonalized in a restricted subs…
Flexoelectrically controlled twist of texture in a nematic liquid crystal
We describe a new flexoelectric volume effect in homogeneous electric field, in the nematic phase of MBBA. An initial splay-bend texture is created by strong antagonistic planar and homeotropic anchoring on two glass plates. This results in a volume flexoelectric polarization. A transverse DC electric field creates a…
Mixed-ligand complexes of trivalent lanthanide ions with .beta.-diketones and heterocyclic amines
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixed-ligand complexes of trivalent lanthanide ions with .beta.-diketones and heterocyclic aminesK. Iftikhar, M. Sayeed, and N. AhmadCite this: Inorg. Chem. 1982, 21, 1, 80–84Publication Date (Print):January 1, 1982Publication History Published online1 May 2002Published inis…
Thermoplastics, materials engineering
Basic principles of polymer science. Thermoplastics materials. Additives, blends and composites. Deformation behaviour of thermoplastics in relation to product design. Engineering interpretations of mechanical failures. Complementary engineering properties. Rheological behaviour of thermoplastics in relation to proces…
Kinetics of the decomposition of hydrogen peroxide in alkaline solutions
Hydrogen peroxide decomposition in 1–5 mol dm–3 KOH and 1–2 mol dm–3 NaOH solutions is a first-order reaction with respect to undissociated hydrogen peroxide. The decomposition is catalysed by compounds of heavy metals (Fe, Cu) present as trace impurities in these solutions and is first order with respect to them. The…
Abrasive Wear Mechanisms in Steels
Abrasive wear tests have been carried out on three steels and a number of pure metals using a pin-on-drum instrument. Each steel was tested at several different hardness levels attained by varying the heat treatment and while the results show a relationship between abrasion resistance and hardness, this was not the li…
An Apparatus and Technique for the Forcible Silking of Spiders
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Bonding in a binuclear metal carbonyl: experimental charge density in Mn2(CO)10
X-ray diffraction data (Ag Ka and Mo Net radiation) have been collected at 74 K on dimanganese decacarbonyl Mn2(CO)I 0, and the crystal structure was refined. The atomic positional and thermal parameters were determined from high-angle AgKa data to avoid systematic errors due to bonding effects. The molecular geometry…
Review on Metal-Filled Plastics. Part1. Electrical Conductivity
Plastic composites are members of both the oldest and the newest of materials. The first reinforced polymeric-based materials are recorded in Genesis and Exodus in the Bible as being used by the people of Babylonia and Mesopotamia around 4000–2000 B.C. These materials consisted of bitumen-based pitch for building prod…
Mixed discretization procedure for accurate modelling of plastic collapse
Abstract Collapse loads are overestimated by finite‐element or finite‐difference procedures when the material discretization does not allow locally incompressible plastic flow: for example, constant‐strain triangles or tetrahedra give unacceptable results. The use of different discretizations for the isotropic and dev…