Materials Literature
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Abstract An attempt has been made to improve the quality of low grade wood through radiation induced wood plastic composite (WPC) formation in order to use these low grade woods as substitutes for high grade wood. Six kinds of local woods of Bangladesh (simul, korai, mango, jack fruit, teak, and garjon) were investiga…
Abstract Barbituric acid (BTA) was used as an initiator for the homopolymerization of bismaleimide (BMI). The reaction was controlled by the amount of barbituric acid and ended up with solvent‐soluble oligomers. The effects of varying the amounts of BTA, as well as the reaction time, on BMI's self‐polymerization react…
Abstract Two dilatometers are presented here that were developed for the use with, but not limited to, low‐shrink unsaturated polyester resins. One of the dilatometers, made from a glass syringe and two aluminum plates, was limited to lower pressures. The other dilatometer, similar in design to the first, was made fro…
Abstract Composites were made from polyethylene and an organic fiber (pecan shell and peanut hull flour) using a compression‐molding technique. Studies of variations in molding temperature (145–180°C), fiber concentration (0–40% by weight), and fiber mesh size (100, 200, and 325) were correlated to the mechanical prop…
We report x-ray diffraction measurements of residual stress in sapphire crystals implanted with Cr+ ions. Stress is determined by measuring both in-plane and out-of-plane lattice constants. Bragg peak positions are measured to determine average stress, while peak widths are measured to determine its variation. Using a…
The dense packing of polymeric spheres in latex films has been investigated by means of small-angle neutron scattering. The films were prepared by evaporation of the water out of a dispersion consisting of monodisperse charged particles (diameter 130 nm). Analysis of the Bragg peaks found in the scattering reveals tha…
Valence and conduction state distributions in a series of Al-Cu-Fe and Al-Cu-Fe-Cr alloys of different structural states and nominal compositions have been investigated by means of soft X-ray emission and photoabsorption spectroscopies. A complete description of the valence band is obtained. The DOS at E F is observed…
The alpha - beta , beta - gamma and gamma - delta transitions in Na 2 CO 3 are observed through frequency changes in the carbonate ion internal modes. The incommensurate phase shows particularly interesting behaviour, as the nu 4 mode splits into two components at the beta - gamma transition which represent edge singu…
The electron-energy distribution in a gold film was measured with \ensuremath{\sim}700 fs time-resolved photoemission spectroscopy following laser heating by a 400 fs visible laser pulse. The measured distribution can be fitted by the Fermi-Dirac function at an elevated temperature except within 800 fs of the heating…
The electronic structure for graphene monolayer tubules is predicted as a function of the diameter and helicity of the constituent graphene tubules. The calculated results show that approximately 1/3 of these tubules are a one-dimensional metal which is stable against a Peierls distortion, and the other 2/3 are one-di…
A guide to the properties and uses of the different alginate dressings available today.
Article Re-Investigation of the Gd - Co Binary System / Untersuchungen im binären System Gd —- Co was published on May 1, 1992 in the journal International Journal of Materials Research (volume 83, issue 5).
Navicula geisslerae sp. nov. is described from the river Spree on the basis of LM, TEM and SEM studies. N. geisslerae is compared with similar taxa, e.g. N. absoluta Hustedt, and its generic status in relation to the species previously placed in sub-genera of Navicula are discussed.
The effect of vanadium (0–4%) on the morphology and amount of eutectic and eutectoid carbides in high speed steels has been investigated using scanning electron microscopy and image analysis. It was found that vanadium promotes the formation of MC carbide and M2C carbide, but inhibits the formation of M6C carbide. In…
During recent years, various hydantoin based heterocyclic glycidyl amine resins have been developed. In these resins the presence of nitrogen containing heterocycle provides extensive variation in polarity, viscosity and hydrophobicity by the choice of alkyl groups. Most of these resins have low viscosity, high polari…
This paper discusses the use of Rietveld analysis to solve crystal structures of titanyl phthalocyanines. Rietveld analysis is based on whole pattern fitting in which every point in the x-ray powder diffraction pattern is used as a measure of one or more Bragg diffraction peaks. Thus the refinement of relatively compl…
It is shown that fatty acids such as the arrachidic and the lauric acids and their mixtures with cholesterol exhibit nonlinear optical properties. The effects of a 20 mW He-Ne laser (λ= 6328 Å) on such mixtures exhibiting smectogenic mesomorphism were examined and the optical activity dependence on the cholesterol per…
Heat capacities and thermodynamic properties of a number of poly(chlorotrifluoToethylene) samples subjected to various thermal treatments, to achieve crystallinities ranging from approximately 10 to 90%, have been studied from 2.5 to 370 K by automated adiabatic calorimetiy and from 250 to 620 K by differential scanni…
Abstract Three of the six possible stereoisomers of dodecahydroacenaphthylene, t,t,t ‐ufolane ( 1 ), c,c,t ‐ufolane ( 3 ), and c,c,c ‐ufolane ( 5 ), have been synthesized for the first time. The configurations have been confirmed inter alia by an X‐ray analysis of the precursors 11, 14 , and 23 and the bromine adduct…
In situ observation of the growth of isotactic polystyrene has been carried out under a transmission electron microscope. Bundles of lamellar crystals first emerge from the melt, and then a planar crystal parallel to (001) grows out from one end of each bundle. The planar crystal assumes the shape of a hexagon faceted…