Materials Literature
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Abstract A series of segmented polyurethanes based on a hydroxyl terminated polybutadiene soft segment (HTPBD) have been prepared with varying hard segment content between 20 and 60 weight percent. These materials are linear and amorphous and have no potential for hydrogen bonding between the “hard” and “soft” segment…
Scanning electron microscopy and electron probe micro‐analysis were used to investigate the microstructure of both slow‐cooled and quenched polycrystalline BaTiO 3 specimens with a small excess of TiO 2 (Ba/Ti=0.995 to 0.999) or of BaO (Ba/Ti=1.002 and 1.005). The electron micrographs of polished and etched TiO 2 ‐exc…
Abstract Two closely related series of polyesters that contain mesogenic units interconnected by flexible spacers along the main chain were prepared and characterized for their liquid crystal properties. All of these polymers showed theotropic behavior, which was examined by DSC, hot‐stage microscopy on a polarizing m…
Abstract Die Kristallstruktur von CuGaInO 4 wurde bestimmt. Die Substanz kristallisiert in der Raumgruppe R 3 m mit den hexagonalen Gitterkonstanten a = 335,4(3) und c = 2481(5) pm (Z = 3). Die Anionen bilden eine 12 L‐Struktur mit der Stapelfolge (31) 3 . Indium liegt zwischen kubisch gestapelten Sauerstoffschichten…
The layered transition metal dichalcogenides of TiS 2 , ZrSe 2 and VSe 2 were found to react reversibly with lithium in electrochemical cells. The energy densities of these cathode materials were determined to be 500, 240 and 250 W·h/kg for one lithium intercalation per unit cell, respectively and 420 W·h/kg for two l…
Abstract Benzoato-pyridine-iodine(I) and phthalato-bis(pyridine-iodine(I)) crystallize in the monoclinic spacegroup P2 1 /c. In both cases iodine(I) shows an almost linear coordination towards the pyridine-N and one carboxylate-O donor atom. The I -N distances range from 228 to 232 pm, the I - O distances from 213 to…
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…