Materials Literature
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Manganese- and iron-oxidizing bacteria (MFOB) are widely implicated in microbially influenced corrosion, often in association with sulfate-reducing bacteria (SRB). Traditionally MFOB have been assigned a passive role in the corrosion process, promoting differential aeration cells, and providing oxygen depleted conditi…
We report the measurement of nondipolar asymmetry parameters for the angular distributions of argon 1s, krypton 2s, and krypton 2p photoemission within 2--3 keV above their respective thresholds. Pronounced asymmetries with respect to the direction of photon propagation are present even at low electron kinetic energie…
Abstract A series of reduced-charge montmorillonites (RCM), prepared from the same parent Li-montmorillonite (Jelšový Potok, Slovakia) by heating at various temperatures (105–210°C) for 24 h, was treated with 6 m HCl at 95°C for periods up to 30 h. Reaction solutions obtained were analysed for Al, Fe, Mg and Li and th…
IR and UV-VIS optical spectroscopy have been used to study the transformations of the properties of diamondlike carbon films following isothermal anneals from Ta=300 to 650 °C. Several processes due to the annealing have been observed: (1) the increase of the absorption due to vibrations of unsaturated bonds of C(sp2)…
Lattice expansion, phase stability, and dimensional stability of doped lanthanum chromites have been examined over a wide range of temperatures and oxygen partial pressures. Reduction of doped lanthanum chromite resulted in a linear expansion of the sample that was dependent on the acceptor (Sr, Ca) concentration, tem…
Luminescent nanometer-sized silicon particles are fabricated by laser ablation of a silicon target in helium gas. The formation of products is found to be governed by the dynamics of the laser-ablated silicon particles in the gas. The products deposited on silicon substrates exhibit light emission with a peak at 1.6 e…
We present an improved calculation of higher-order corrections to the one-loop self-energy of 2P states in hydrogenlike systems with small nuclear charge Z. The method is based on a division of the integration with respect to the photon energy into a high- and a low-energy part. The high-energy part is calculated by a…
Abstract The synthesis of carbohydratecontaining dendrimers has been achieved by a convergent growth approach. The synthetic strategy involves: 1) the synthesis of the triglucosylated derivative of tris(hydroxymethyl)methylamine (TRIS), 2) the introduction of a glycine‐derived spacer and 3,3′‐iminodipropionic acid der…
The effect of sintering temperature on the microstructure and crystal phases of the intergranular praseodymium oxides in ZnO varistor ceramics was investigated using transmission electron microscopy and high‐resolution electron microscopy. The ZnO grains were three‐dimensionally separated from the intergranular praseo…
Ferroelectric properties, crystal structure and microstructures were examined for various Sr/Bi/Ta atomic ratio strontium bismuth tantalate (SBT) films prepared by metalorganic decomposition at 700 and 800° C. The 20% Sr-deficient and 10% Bi-excess (0.8/2.2/2) composition showed maximum remanent polarization ( P r ) v…
Abstract Some new heterocyclic liquid‐crystalline compounds incorporating a 1,3‐disubstituted allene unit were synthesised. These axial‐chiral compounds were investigated by polarisation microscopy and differential scanning calorimetry. One of them was also synthesised in enantiomerically enriched form by enantioselec…
The United States generates the largest amount of solid waste per person in the world. The old practice of direct landfilling and storage is receiving greater public resistance and is attributing to the search for alternative disposal methods. The evergrowing problem of solid wastes requires environmentally benign and…
Abstract This paper is a contribution to development of electron beam profilography based on the so called “shape from shading” technique. A new formula of signal processing in a two detector system has been proposed. The formula en be applied to all the signals showing Lambert's angular distribution. The signal proce…
Abstract We have discovered that the impact strength of polystyrene is increased by the addition of rigid particles several microns in diameter and at concentrations of 0.01 ∼ 1 wt%. As examples, we used barium sulfate particles and crosslinked polystyrene beads. From the observation of real‐time deformation of polyst…
Abstract This paper demonstrates how ultrafine talc can be used in a rigid PVC formulation to design a compound with increased stiffness and high impact strength. The talc's shape and particle size, combined with the affects of increased levels of impact modifier, produce a PVC material with an outstanding impact stif…
The structure and properties of a polypropylene microporous film prepared by biaxial stretching of non-porous polypropylene film of high β-crystal content were investigated. The porosity of these films can be as high as 30–40%, and the average pore size was around 0.05 μm. The films were found to have the structure of…
Nanocrystalline element selenium (nc-Se) samples were synthesized by completely crystallizing a meltquenched amorphous selenium ($a$-Se). Heat capacities (${C}_{p}$) of the nc-Se (with a mean crystallite size of 10 nm), a fully relaxed $a$-Se, and a coarse-grained polycrystalline Se were experimentally determined in a…
Wool and nylon 6 fibres treated with oxygen low‐temperature plasma were dyed with acid and basic dyes. Despite the increase of electronegativity of the fibre surface caused by the plasma treatment, the rate of dyeing of wool was increased with both dyes, while that of nylon 6 was decreased with the acid dye and increa…
Thin films of Cs2Te have been produced and analyzed by Auger depth profiling and x-ray photoemission spectroscopy (XPS). The formation of the photoemissive material passes through different phases, each of them has been characterized by XPS and by its total yield in the spectral region 3.5–5 eV. Copper and molybdenum…
The tetragonal form of hen egg-white lysozyme is the most investigated protein crystal for growth studies, but the relationship between its surface morphology and internal structure is still not well understood. One method of determining this relationship for inorganic crystals is by employing the periodic bond chain…