Materials Literature
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We have investigated the energy band structure of single crystals of n-type Bi 2- x Sb x Se 3 (0.2 ≤ x ≤ 0.52), p-type In x Bi 2- x Te 3 (0 ≤ x ≤ 0.1) and p-type Sb 2 Te 1.2 Se 1.8 by cyclotron resonance in high magnetic fields up to 150 T. In n-type Bi 2- x Sb x Se 3 , two resonance peaks were observed corresponding…
Co-Phthalocyanine complex was immobilized on 3-n-propylimidazole groups grafted on a porous SiO2 surface (specific surface area S BET = 500 m² g-1) and efficiently electrocatalyzed the oxalic acid oxidation on a carbon paste electrode surface made of this material. Intermolecular interactions of the complex species wh…
Reports the effects of composition and curing temperature on the film properties of three water reducible enamels prepared from palm stearin alkyds. The properties studied were hardness, flexibility, and adhesion. While all the formulations exhibit excellent adhesion, generally increasing the melamine content and curi…
Over recent years, attention has been focused on the development of ferritically hot rolled steels, despite the inherently low drawability attributed to the formation of a (110) texture just below the strip surface. This texture, which cannot be removed by further processing, prevents the formation of the (222) compre…
The high sinter activity of alumina nanoparticles was used to bond coarse-grained corundum ceramics. The employed nanopowder was generated by the evaporation of solid corundum rods using the radiation of a Nd : YAG-laser followed by condensation of the vapour in a controlled atmosphere. Some nanopowder was sandwiched…
Protease inhibitor 1 (α1-antitrypsin; AT) is the main serum inhibitor of proteolytic enzymes. In AT deficiency, enzymes such as neutrophil elastase can damage the lung tissues, leading to pulmonary emphysema. More than 90 different alleles have been identified to date for the protease inhibitor 1 gene (PI). The three…
Khmaralite, Ca 0.04 Mg 5.46 Fe 3+ 0.12 Fe 2+ 1.87 Al 14.26 Be 1 . 43 B 0.02 Si 4.80 O 40 , is a new mineral closely related to sapphirine from Khmara Bay, Enderby Land, Antarctica. It occurs in a pegmatite metamorphosed at T ≥ 820 ℃, P ≥ 10 kbar. The minerals surinamite, musgravite, and sillimanite associated with khm…
A study of solidification phenomena performed under industrial conditions is presented. The solidification structure of high carbon, medium carbon and microalloyed steel grades was observed and correlated to casting parameters such as superheat and secondary cooling. Experimental data of dendrite morphology are relate…
In this paper, the numerical simulation for the in situ degradation of toxic water pollutants in the presence of semiconductor catalyst particles is considered. The computer simulation is in search of an efficient photocatalytic reactor design to achieve better fluid-catalyst contacting to minimize mass transfer limit…
Abstract A series of blends consisting of polylactic acid (PLA) and aliphatic succinate polyester (Bionolle#3000) have been prepared. The results of the mechanical property investigation have shown that using more than 20 wt % Bionolle#3000 can significantly increase the toughness of the PLA, increase the elongation a…
Interdiffusion in Sc‐doped and Ta‐doped BaTiO 3 ‐BaZrO 3 perovskites was examined, both theoretically and experimentally. Analytical expressions for the lattice velocity, v , and the interdiffusion coefficient, D̃ , were obtained. The v and the D̃ were numerically evaluated as a function of dopant type (trivalent‐acce…
The Mode I fracture toughness ( K I C ) of a small‐grained Si 3 N 4 was determined as a function of hot‐pressing orientation, temperature, testing atmosphere, and crack length using the single‐edge precracked beam method. The diameter of the Si 3 N 4 grains was <0.4 µm, with aspect ratios of 2–8. K I C at 25°C was…
The dynamical electrooptic (EO) response of mesogenic side-chain polymer-stabilized ferroelectric liquid crystal cells has been investigated based on the continuum theory. From numerical calculations, the transition from the bistable EO response to the monostable EO response for pulse-applied voltages is clearly demon…
Many of the cultivated soils of sub‐Saharan Africa typically have a surface horizon low in clay and with a low cation exchange capacity (CEC). In these soils, CEC is largely due to the soil organic matter (SOM). Measurements made on long‐term trials show that changes in CEC and SOM are positively correlated to one ano…
The effects of amino acid substitutions in the N-terminus of bovine recombinant alpha-lactalbumin (including enzymatic removal of the N-terminal methionine and deletion of Glu-1) were studied by intrinsic fluorescence, circular dichroism (CD), and differential scanning microcalorimetry (DSC). Wild-type recombinant alp…
Abstract Flexible plastic foams using soy protein isolate (SPI), soy protein concentrate (SPC), and defatted soy flour (DFS) were produced by interacting proteins with glycerol‐propylene oxide polyether triol (polyol), surfactant, triethanolamine (crosslinking agents), tertiary amine (catalyst), and water (blowing age…
ABA type block copolymers with poly[3(S)-isobutylmorpholine-2,5-dione] (PIBMD, A) and poly(ethylene oxide) (Mn = 6 000, PEO, B) blocks, PIBMD-b-PEO-b-PIBMD, were synthesized via ring-opening polymerization of 3(S)-isobutylmorpholine-2,5-dione in the presence of hydroxytelechelic poly-(ethylene oxide) with stannous oct…
Two cardiotonic glycosides were isolated from Calotropois procera; one of them (1) is a new natural product. Their structures were elucidated by extensive application of one- and two-dimensional 1H and 13C NMR spectroscopy. Copyright © 1999 John Wiley & Sons, Ltd.
The effect of transparency and finite thickness of the sample on the peak profile in powder diffractometry with Bragg–Brentano geometry is treated as a convolution with an asymmetric aberration function. The formula of the aberration function and a practical method for numerical calculation of the convolution are prop…
Random fluctuations in current and voltage under free corroding conditions have been measured on austenitic steel 304 in sodium chloride solutions with different aggressiveness. The evolution of these fluctuations in time and frequency domains is analysed and related to the corrosion process on the surface electrode.…