Materials Literature
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The terms "euhedral," "subhedral," and "anhedral" have limited value as an expression of crystal morphology relating to conditions of crystal formation and rock-forming processes. The basis of this traditional nomenclature is the presence or absence of crystal faces, implying that if a crystal has faces its overall sh…
Abstract “Two dimensional” talc was prepared by the hydrothermal reaction of various silicas with magnesium hydroxide. The precipitated and activated silicas were especially available as starting materials. The powder X-ray diffraction data indicated that the resulting talc consisted of no-stratified and random layere…
Abstract It would be advantageous to determine the causes of changes in rheological behavior of a compound during mixing, so that mixing times and conditions could be optimized to give the desired processing behavior and properties of the final product. The causes of changes in viscosity during mixing of a compound co…
Abstract The effect of crosslink structures on the fatigue crack growth (FCG) behavior of unfilled and HAF-filled vulcanizates with conventional (Conv), semi-efficient (Semi-EV) and efficient (EV) cure systems, all with similar levels of total crosslink densities, was investigated before and after aging at 100°C in ai…
Abstract Einkristalle der neuen Silicate CsKNaLi 9 {Li[SiO 4 ]} 4 , CsKNa 2 Li 8 {Li[SiO 4 ]} 4 , RbNa 3 Li 8 {Li[SiO 4 ]} 4 und RbNaLi 4 {Li[SiO 4 ]} 2 , sowie Pulver der Rb‐haltigen Verbindungen wurden dargstellt. Die Proben entstanden durch Tempern inniger Gemenge binärer Oxide in geschlossenen Ni‐ bzw. Ag‐Bömbchen…
The properties of poly(vinyl acetate) compositions prepared as potential wood adhesives were investigated. The paper presents the results of the influence of various kinds of inorganic fillers based on calcium carbonate and alumino-silicate and an organic filler, starch, on the adhesive composition properties. The com…
The acid-induced reversible unfolding of several forms of the mitochondrial isoenzyme of mammalian aspartate aminotransferase, including its precursor form, has been characterized under equilibrium conditions. A minimum of two transitions can be detected for the holoenzyme (pyridoxal form). One transition takes place…
Abstract A systematic spectrophotometric study on the complexation of chromium (III) ion with sodium carboxymethyl cellulose (CMC) was carried out. The effects of the degree of substitution (DS) of the polymer, the concentrations of Cr(III) and CMC solutions, the pH and temperature on the complex formation were studie…
Laboratory-scale batch experiments (semicontinuously fed) were conducted using a two-level factorial experimental design to investigate principal factors and interactions affecting microbiologically influenced corrosion (MIC) of carbon (C) steel. Factors considered included the C source as chemical oxygen demand (COD)…
Severe reactor accident scenarios involving air ingression into the reactor coolant system are described. Evidence from modem reactor accident analyses and from the accident at Three Mile Island show residual fuel will be present in the core region when air ingression is possible. This residual fuel can interact with…
Detailed thermal activation analysis has been carried out on experimental data for the plasticity of polycrystalline titanium containing 0·06–1·6 at.% O in the temperature range 4·2–600 K. The analysis of the dislocation-impurity interaction parameters took into consideration the variations in the shear modulus and in…
In spite of extensive optimizations of transformer core designs, investigations of full sized cores showed distinct inhomogeneities of flux density B. Limbs showed discontinuous variations of B in peripheral packages and minima of B in thick central ones. The latter are not caused by global eddy currents but rather by…
Two-dimensional negative-temperature systems described by means of analytical solutions of the Poisson–Boltzmann equation are investigated. It is shown that two kinds of doubly periodic self-consistent structures can exist. The structures obtained confirm the prediction of equilibrium statistical mechanics that no spa…
A major control strategy for dilute waste streams of volatile organic compounds (VOCs) in air is incineration. However, no single incineration technology will likely serve as the optimal solution for all applications. In addition, with increasing VOC regulation, more variations of incineration or oxidation systems are…
Abstract It has been suggested that interlayer water in halloysite is due to the presence of hydrated cations that balance the negative layer charge produced by Al for Si substitution. To find evidence of 4-coordinate Al (Al(IV)), we investigated six halloysites and two kaolinites using ‘high-field’ and ‘medium-field’…
Structural, optical, dielectric, and pyroelectric properties of crystals and ceramics of BaAl2O4 have been investigated. A refinement of the atomic positions has been carried out from X-ray powder diffraction data. BaAl2O4 is ferroelectric with TC=396K. The thermal behavior of Ps shows a broad maximum close to 220K wi…
Specific patterns of attacks of cotton, bacterial cellulose and bacterial microcrystalline cellulose (BMCC) by recombinant cellulases of Cellulomonas fimi were investigated. Molecular-size distributions of the celluloses were determined by high-performance size-exclusion chromatography. Chromatography of cotton and ba…
In the range of high strain rates, the mechanical behaviour of materials is characterized by an increased strain rate sensitivity, by increasing effects of mass inertia forces and by the adiabatic character of the deformation process. For the relation between stress, strain and strain rate, empirical formulae are now…
In this work, the possibilities of splitting tests (Brazilian tests) to determine the mechanical properties of ceramic materials at high strain rates are analyzed. The study is based on the mechanical characterization of cylindrical specimens in the Hopkinson bar and the use of a high speed camera to observe the failu…
Immunoscreening and DNA hybridization were used to isolate a 1.72-kilobase pair cDNA encoding cytosolic NADP(+)-dependent isocitrate dehydrogenase from a rat liver, lambda gt11 cDNA library. The identity of the cDNA was confirmed by comparison of the deduced amino acid sequence with sequences of peptides obtained from…