Materials Literature
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Mutual diffusion at PS/PVME (polystyrene/polyvinyl methyl ether) interface both below and above the glass transition temperature, Tg, of polystyrene was probed by Attenuated total reflection (ATR) and rheometry techniques. The results were analyzed with a simple three layer model and a combination of Fickian and Case-…
A computer program KAMUI has been developed to simulate multi-dimensional thermal-hydraulic behaviors of the coolant and disrupted fuels in a subassembly under hypothetical accident conditions of a Liquid-Metal Fast Reactor (LMFR) where the strong momentum and thermal coupling of the coolant flow dominates the materia…
When modelling the fracture toughness of the investigated AISI M2 high-speed steel, the stress-modified critical strain criterion was used. The very important influence of microstructural parameters such as the volume fraction of undissolved eutectic carbides, their mean diameter, and the mean distance between the car…
The oxidation kinetics and the fraction of aluminum that is oxidized via solid–gas reaction in reaction‐bonded aluminum oxide (RBAO) compacts are shown to be strongly dependent on the oxidation temperature and the characteristics (size and green density) of the RBAO compact. Based on the Biot number, the oxidation pro…
We report the observation of two kinds of octagonal-cubic transition to either the \ensuremath{\beta}-Mn-type structure or the ${\mathrm{Mn}}_{3}\mathrm{Si}$ crystal following annealing Mn-Si-Al octagonal quasicrystal at different heating speeds. A theoretical analysis has been given and the simulated diffraction patt…
Two species of large extension feeding barnacles are abundant on exposed tropical rocky shores of northern Australia. The cirri of many specimens carry varying numbers of a commensal diatom in some cases with as many as 2000 individuals on a single cirrus. The araphid diatom resembles the genus, Lichmophora within the…
Applications of Genetic Algorithms for optimisation of atomic clusters are reported. It is shown that the genetic algorithms are very useful tools for determining the minimum energy structures of clusters of atoms described by interatomic potential functions containing up to a few hundred atoms. The algorithm generall…
Various microorganisms were screened for their ability to degrade poly(tetramethylene succinate)-co-(tetramethylene adipate) (PBSA). Strain BS-3, which was newly isolated from a soil sample, was selected as the best strain. From taxonomical studies, the strain was tentatively ascribed to belong to the genus Acidovorax…
Abstract The crystal structure of boleite, K Pb26 Ag9 Cu24 Cl62 (OH)48, a 15.288(2) Å, V 3574(1) Å3, Pm 3̅m, Z = 1, has been refined to an R-index of 2.2% based on 884 observed (5σ) reflections collected with MoKα X-radiation. A new site was resolved, and site-scattering refinement showed it to be occupied by a scat…
Single crystals of rubidium hydrogen (+)-tartrate [RbH(C4H4O6)] (RbHT) were grown by slow evaporation of an aqueous solution at room temperature. The crystals have been studied by Raman scattering; infrared transmittance at room temperature was measured on powder samples. Tentative assignments have been made for both…
The biodegradability of poly(vinyl alcohol) (PVA) was investigated under different conditions by respirometric determinations, iodometric analysis, and molecular weight evaluation. Microbial inocula derived from the sewage sludge of municipal and paper mill wastewater treatment plants were used. A rather active PVA-de…
Novel chitosan-based polymeric networks were synthesized and characterized by FTIR, UV and C13 NMR. A naturally occurring crosslinking reagent—genipin, which has been used in herbal medicine and in the fabrication of food dyes, was used to prepare crosslinked chitosan hydrogel. The heterocyclic compound of genipin cro…
If a stress σ is applied to a polycrystal of grain size L, the mode of creep deformation depends on the answers to the following questions: (I) Does σ exceed the Peierls stress σp; (II) Does L exceed the dislocation spacing in a Taylor lattice stabilized by σp; (III) Does Lσ exceed the value required for a Frank-Read…
Methylene chloride is used as softening agent for guttapercha and as adhesion promotor for polymethylmethacrylate (PMMA). However, methylene chloride has been found to be carcinogenic. It was the aim of the present work to search for harmless substitutes for methylene chloride in these situations. A number of possible…
The structure particular to layer aluminumsilicates is discussed permitting the intercalation of polymers. This process ultimately leads to nanocomposites that exhibit interesting properties. It will be shown that many improvements of physical properties can be achieved by polymer-clay nanocomposites.
Dendritic macromolecules are hyperbranched polymers that emanate from a central core, have a defined number of generations and functional end groups, and are synthesized in a stepwise process by a repetitive reaction sequence. This hyperbranched topology results in a unique series of physical and chemical properties e…
Die Kombination rasterkraftmikroskopischer (AFM) und elektrochemischer Untersuchungen ermöglicht die in situ Beobachtung lokaler Korrosionserscheinungen, wie beispielsweise der interkristallinen Korrosion (IK) austenitischer Chrom-Nickel-Stähle. Für austenitische Stähle besteht ein eindeutiger Zusammenhang zwischen de…
Ercitite, ideally Na Mn 3+ (PO 4 ) (OH) (H 2 O) 2 , is a new mineral species from the Tanco pegmatite, southeastern Manitoba. Ercitite forms 200–400 μm irregular aggregates of lath-like crystals in fan-like divergent sprays. The mineral occurs in a 5-cm nodule embedded in a quartz + spodumene pseudomorph after petalit…
The effectiveness of fireproof intumescent coatings based on water glass can be considerably increased if the coagulated sodium water glass is used as an intumescent component. When heated, the coagulated sodium water glass creates a steam-gas cloud above the protected surface which together with foam formation decrea…
Sodium p-nitrophenolate dihydrate single crystals possess excellent nonlinear optical properties such that they can be used for optical second-harmonic generation. It belongs to the orthorhombic system with the space group $\mathrm{Ima}2.$ Slow evaporation or slow cooling techniques can be used to grow good optical qu…