Materials Literature
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The objective of this study was to relate potentially mineralizable soil nitrogen (N) obtained by means of long-term aerobic incubations (No), with nitrogen mineralizated using more rapid and simple methods such as KCl digestion (Nq) and short-term anaerobic incubations at 40 oC (Na). A preliminar experience, carried…
Certification tests in accordance with the requirements of the recent IEC 61259 standard for switching of bus-charging current by disconnecters of a (three-phase enclosed) 145 kV gas insulated switchgear (GIS) are described. These tests are primarily aimed at verifying that the discharge between the disconnector conta…
Replication of surface relief microstructures into COC (cyclic olefin copolymers) plastics using a hot embossing technique is considered. The replication accuracy has been investigated by optical characterization and scanning electron microscopy (SEM) of the replicated surface profile, which is a diffractive anti-refl…
Crystals of Gly·H3PO3 with various degree of deuteration were grown and their physical properties were investigated. Anomalies of permittivity related to para- ferroelectric phase transition were observed in the whole range of deuterium content. Ferroelectric character of the observed phase transitions was confirmed f…
The parent bis[1,2]dithiolo[1,4]thiazine-3,5-dione 8, -3,5-dithione 11, the unsymmetrical 3-oxo-5-thione 10 and the bis[1,2]dithiolopyrrole-3,5-dione 9 are synthesised by acid catalysed cleavage of their various N-benzyl, ethyl, ethoxycarbonylethyl and propanoic acid derivatives. These N-alkyl compounds are prepared i…
The elastic, piezoelectric, and dielectric characteristics of α-GeO 2 crystals are studied at room temperature. The measurements were performed by the resonance method on crystals grown on α-quartz seeds from solutions in the recirculating mode. In germanium dioxide crystals, the piezoelectric moduli have high values.…
This series of papers is based on an anthropometric survey conducted on 618 female Kenyan children aged from two to six years. Part I discusses the procedures in which correlation coefficients of 33 parameters were analysed, resulting in a centilong system based on height, outside leg, chest, and hip as key dimensions…
The effect of z value on the high temperature performance of Sm(Co/sub 0.795/Fe/sub 0.09/Cu/sub 0.09/Zr/sub 0.025/)/sub z/ with effective z=7.14-8.10 was studied up to 600/spl deg/C. It was observed that the intrinsic coercivity (/sub M/H/sub c/) was very sensitive to the z value, especially when the temperature was l…
Fatigue tests at 600°C in air were performed on U-notch specimens of wrought IN718, using l-l-l-l and 1-20-l-l trapezoidal cycles. SEM examination and acetate replication was used to study crack initiation andgrowth. In support of the fatigue tests, thermal exposure experiments were performed on unstressed specimens t…
Single stroke hot deformation process was introduced for the first time in this study. A high performance anisotropic NdFeB magnet was fabricated by this new method from MQPA ribbon powder. Principal factors that influenced hard magnetic properties, temperature and deformation percentage, were investigated. Under opti…
Data relating to the ZnO/ZnCl2-accelerated vulcanization of chlorinated poly(isoprene-coisobutylene) (CIIR or chloro-butyl) is examined. ZnCl2 and conjugated diene butyl units on the polymer chain are both precursors to crosslinking, and a revised cationic mechanism is proposed to account for crosslinking, taking into…
The catalytic oxidation of both CH4 and C3H8 over combustion synthesized nanosize Pt, Pd, Ag and Au particles supported on α-Al2O3 was investigated using the temperature programmed reaction technique in a packed-bed tubular reactor. Complete CH4 oxidation occurs over 1% Pd/Al2O3 and 1% Pt/Al2O3 at 350 and 425 °C, resp…
A molecular dynamics (MD) study of the lithium ultraphosphate glass series, xLi2O·(1−x)P2O5 (0⩽x⩽0.5) was used to investigate the changes in the Li environment with increasing modifier concentration. The results from the MD simulations indicate that only gradual structural variations in the Li coordination environment…
For the separation of volatile organic compounds (VOCs) from water by pervaporation, three polysiloxaneimide (PSI) membranes were prepared by polycondensation of three aromatic dianhydrides of 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA), and pyro…
The corrosion inhibition of nitrogen, oxygen and sulphur containing compounds in acidic chloride solutions was studied by chemical and electrochemical techniques.The percentage inhibition efficiency was calculated from both methods is in good agreement.The corrosion rate was found to be a function of the nature, conce…
New rosin-based photoactive polyamideimides (PAI-a and PAI-b) with a large second-order nonlinear optical coefficient and photoinduced birefringence were synthesized by the polycondensation of rosin–maleic anhydride adduct (RMA) with azo-dye diamines, 2-(2-{ethyl-[4-(4-nitrophenylazo)phenyl]aminoethoxy)benzene-1,4-dia…
Seven anisotropic diimines and their corresponding dinuclear complexes of rhenium(I) have been synthesized. The crystal and molecular structures of one of the dimines and two of the complexes were determined. In common with related imine ligands which have been synthesized previously, the new diimines were mesomorphic…
The effects of “training” and ausforming on the morphology of stress-induced martensite and its reversion behavior to austenite in Fe–14Mn–6Si–9Cr–5Ni and Fe–28Mn–6Si–5Cr (mass%) alloys have been studied using atomic force microscopy (AFM), with the aim of clarifying the mechanism of the improvement of the shape memor…
This paper presents a method based on both artificial neural networks (ANNs) and on a multidimensional optimization procedure in order to significantly reduce the time taken and to improve the accuracy in evaluating parameters of the Jiles-Atherton model of magnetic hysteresis. The main steps of the method are (1) dat…
Bioimmobilization with sol-gel method is a complicate system, involving many parameters that can affect sol-gel structure and immobilized biomolecules activity. In this study, trypsin, a model enzyme, was entrapped into sol-gel glasses produced from tetraethoxysilane (TEOS) and water to study the relationships between…