Materials Literature
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Phase equilibria in the Ni-rich region of the Ni–Cr–Hf system have been investigated at 1473 and 1273 K using electron microprobe and X-ray diffraction analysis. The phases involved are: Ni-rich solid solution (γ), Cr-rich solid solution (α), Ni5Hf, Ni7Hf2, and Ni3Hf. Ni7Hf2 shows a considerable solubility for Cr at 1…
Various diene polymers have been modified at room temperature via the ene reaction with 4-substituted-1,2,4-triazoline-3,5-diones. The resulting modified polymers were characterized by means of IR spectroscopy, nuclear magnetic resonance, differential scanning calorimetry, and solubility tests. Physical properties mea…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
Abstract Die Verbindungen Sr 2 Sr 1/4 B □ 1/4 WO 6 ≙Sr 8 SrB □W 4 O 24 gehören zur Gruppe der Perowskite mit oktaedrischen Kationenfehlstellen (Kationen/Fehlstellenverhältnis pro Oktaederplatz = 7:1). Für die größeren B III ‐Ionen (La, Pr, Nd, Sm–Dy) werden unterschiedliche Ordnungseffekte beobachtet. Die Perowskite m…
The behavior of sodium ions in the SiO 2 layer of MOS structures was analyzed using a new numerical method. The method is based on ionic hopping, and drift in the space charge field and diffusion were also taken into account. The computed results were applied to interpret the properties of a thermally stimulated curre…
Scanning electron microscopy was employed to observe the physical interactions between Cristispira spp. and the crystalline style of the Chesapeake Bay oyster (Crassostrea virginica Gmelin 1791). Cristispira organisms were found associated with both the inner and outer layers of the posterior two-thirds of the style.…
Twinned particles of magnesium prepared using the gas evaporation technique were studied using electron microscopy. Particles with (10.1), (10.3), (11.1) and (11.2) twin planes were found in the smoke outer zone. Their external faces were the same as those of single crystal particles, i.e. {10.0} and (00.1). The growt…
This study examines the behavior of twenty-two different protective fabrics, including aluminized and nonaluminized fabrics, in resisting heat transfer and thermal disintegration on impact with molten iron. Maximum heat transferred through the fabrics is measured, and damage is evaluated in a controlled splash test. T…
The absorption of electrons by a polycrystalline gold target depends on the energy, the angle of incidence, and the spin polarization of the primary electrons. The latter dependence is due to the spin-orbit coupling of electrons in elastic scattering. The anisotropy in the diffuse scattering determines the gross featu…
Abstract Polarized Raman and IR spectra of a single KY(MoO 4 ) 2 crystal were measured in the 10–4000 cm −1 region and discussed in relation to the molecular and crystal structures. Spectroscopic data enabled us to reveal additional intermolecular interactions due to pair coupling of the molybdate tetrahedra verifying…
The variation with heat flow geometry of minimum heat source temperature which causes smolder initiation in cellulosic insulation has been examined for eight configurations. These configurations range from a wire-like source, to a flat planar source, to a corner formed by planar sources; they simulate such heat source…
Different values are reported in the literature for the intrinsic birefringence of the crystalline (Δn) and the amorphous (Δn) phases in nylon 6. Mostly, these values have either been determined by extrapolation (and then it is assumed that Δn = Δn) or calculated theoretically. In this study, intrinsic birefringence v…
Delayed failure tests, in which the samples were cathodically charged with hydrogen while under sustained tensile loads, were conducted upon two medium carbon alloy steels which had been quenched, tempered, and cold drawn to very high strength levels. The results were correlated with the microstructure and fractograph…
Several bioclastic and oolitic carbonates have been studied with the transmission electron microscope. Aragonite has been distinguished from calcite on the basis of the SAD patterns and the morphology. The aragonite occurred either as microscopic crystals varying in length from 0.3 to I mm, or as larger masses twinned…
An example of the possible uses of the newly obtained, surprisingly stable title compound (1) is in the synthesis of the unsymmetric siloxane (2). At ca. 240°C (!) (1) forms the new, sterically very crowded cyclotrisiloxane (tBu2SiO)3.
A new technique has been developed to study the surface energy characteristics of small diameter fibres. This method is tensiometric and based on wetting properties in a two phase liquid system. Two types of carbon fibre have been investigated under both static and dynamic conditions in immersion and emersion. The hig…
Abstract The glass transition, rubbery modulus, and tensile behavior of poly(n‐butyl acrylate)/polystyrene interpenetrating polymer networks (IPN's), semi‐1 IPN's, and their corresponding random copolymer networks were studied as a function of both composition ratio and crosslink density. Two temperatures were selecte…
Abstract The sand and silt fractions of soils derived from Tertiary basalt in northeastern Ireland exhibit unusually high cation-exchange capacities. Smectite was identified by X-ray powder diffraction in all size fractions and was selectively dissolved by treatment with 1 N HCl and 0.5 N NaOH. Structural formulae, ba…
The influence of boundary conditions on the smectic A-C * phase transition has been studied. From a consideration of the free energy under the anchoring condition with planar orientation of moelcules on two boundaries, it is shown that the phase transition temperature from the smectic-A to smectic-C phases decreases w…
The siliceous valve of Hantzschia is briefly described, preparatory to following its morphogenesis. While Hantzschia is morphologically very different to Pinnularia, there are several subtle but important similarities in detail. Bundles of microfilaments, significant in generating the gliding motion of these cells, li…