Materials Literature
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An analysis of the various mechanisms involved in carpet wear has provided the general form of a relationship between carpet thickness and the number of treads on the carpet. The possible applications of this approach in wear testing are discussed.
The classical theory of high speed jet and long rod penetration assumes incompressibility of both projectile and target. We extend here previous analyses of the implications of finite compressibility by including the effect of stationary shocks. For uniform projectile velocities V≲6×103 ms−1, depending on the type of…
We have investigated the behavior of and electrodes in a sodium cell at temperatures between 230° and 280°C using the solid electrolyte β''‐alumina. The electrochemical reaction of with sodium was found to be reversible, while was found to decompose.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of tetrakis(trifluoroacetato)bis(dimethyl sulfone)dirhodium(II). A compound with axially coordinated sulfone ligandsF. Albert Cotton and Timothy R. FelthouseCite this: Inorg. Chem. 1981, 20, 8, 2703–2708Publication Date (Print):August 1, 1981P…
Abstract The effects of different hydrogen bonding configurations upon the Raman spectrum of α‐(COOH) 2 ·2H 2 O, α‐(COOD) 2 ·2D 2 O, β‐(COOD) 2 ·2D 2 O and (COOK) 2 ·H 2 O and the temperature stability of β‐ (COOD) 2 ·2D 2 O are reported. The OH stretch frequencies correlate well to the changes in the hydrogen bond l…
This paper describes a power cable insulation with a tree growth inhibiting additive that is nowommer commercially available for use by the electric utilities. The new insulating resin inhibits the growth of both electrical and water trees. A major cause of insulation failure is the progressive ive degradation process…
Intracellular transport and secretion of fibroin in the posterior silk gland cells of the silkworm, Bombyx mori, were investigated in relation to the radial microtubule and circular microtubule-microfilament systems of the cells. The silk glands were pulse-labelled for 3 min with [3H]glycine in vitro and then chased i…
Isomorphous replacement methods have been revolutionary in macromolecular structure research. This has been most clearly demonstrated in protein crystallography. Specific binding of heavy atoms to protein molecules in the crystalline state provides the necessary reference for the phase determination of each Bragg refl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural, EPR and magnetic studies of a nonplanar copper(II) maleonitriledithiolate complexD. Snaathorst, H. M. Doesburg, J. A. A. J. Perenboom, and C. P. KeijzersCite this: Inorg. Chem. 1981, 20, 8, 2526–2532Publication Date (Print):August 1, 1981Publication History Publi…
Feeding methods are described for 12 Florida ascoglossans. Relationships between size and shape of radular teethand dimensions of food algae are analysed. Feeding in a diatom-eating species (Eylsia evelinae) is described for the first time. The suctorial feeding of Ascobulla ulla and the structure of its radula and al…
The author takes an overview of the concept of activation energy, emphasizing that it is really a series of related concepts, with different numerical values associated with each different "activation energy", which often makes the subject confusing to students.
Abstract First, theoretical calculations of electron mobility and thermoelectric power in n‐type InSb are reported at liquid nitrogen and room temperatures. All the scattering mechanisms of importance in InSb are taken into account. The calculations based upon a variational solution of the Boltzmann equation are compa…
A rate type model for the description of the corona effect is proposed. It includes the relaxation properties of an electric line due to the presence of the corona effect. Any perturbation propagates with a constant speed-a characteristic of the line. The constants of the model may be determined from the experimental…
Abstract The solution viscosity of aqueous poly(acrylamide‐co‐sodiumacrylate)s decreases with time in the scale of weeks. This unusual viscosity loss has been investigated by viscometry and by light scattering on high purity copolymer samples with different ratios of the components. — No viscosity loss can be observed…
Abstract Dielectric data were taken on nylon 66 at several moisture levels at frequencies from 10 to 10 5 Hz and temperatures from −70°C to room temperature. Moisture increases the frequency and the peak height for the β relaxation and reduces its activation energy. The peak height of the γ relaxation is reduced by mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of bis(hexafluoroacetylacetonato)(2,2,6,6,-tetramethylpiperidinyl-1-oxy)copper(II), a copper(II)-nitroxyl radical complex with substantial magnetic couplingMichael H. Dickman and Robert J. DoedensCite this: Inorg. Chem. 1981, 20, 8, 2677–2681Publication Date (Print…
Abstract Intercalation compounds of styrene and quaternary ammonium montmorillonite were prepared by immersion of the clay in styrene monomer. The intercalation of stearyltrimethylammonium (CH 3 (CH 2 ) 17 N(CH 3 ) 3 + )-montmorillonite and styrene showed an expansion of the basal spacing to a constant value of ∼32 Å…
The crystal structures of nylon 11 in the form of lamellar single crystal obtained by crystallization from solution was studied and three crystal modifications were found. Lamellar crystals of form I, which were obtained from solution in diols, have a triclinic unit cell and are similar to the α form of nylon 66 and 6…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination chemistry of methylmercury(II). Synthesis, hydrogen-1 NMR, and crystallographic studies of cationic complexes of MeHg(II) with ambidentate and polydentate ligands containing pyridyl and N-substituted imidazolyl donors and involving unusual coordination geometrie…
The polarization characteristics of mild steel were studied under microaerobic conditions in four media, including a synthetic medium and the produced water from an oil field. In all the media, anodic depolarization was always observed when a ferric iron reducing bacterium (Pseudomonas sp.) was present. In produced wa…