Materials Literature
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Magnetoresistance has been studied in LaFe/sub 11.2/Co/sub 0.7/Si/sub 1.1/ compound. The ferromagnetic ordering at Curie temperature T/sub C/ of 274 K was found being accompanied by a drastic negative lattice expansion due to the strong structural and magnetic interplay. Such a simultaneous magnetic and lattice change…
The CO2 reforming of CH4 was carried out over Ni catalysts supported on -Al2O3 and CeO2-promoted -Al2O3. The catalysts were characterized by means of surface area measurements, TPR, CO2 and H2 chemisorption, XRD, SEM, and TEM. The CeO2 addition promoted an increase of catalytic activity and stability. The improvement…
Polyvinyl alcohol (PVA) has been chemically modified to its carboxymethylated form and the product, designated as CPVA are cast into transparent films. It was observed that the mechanical strength of CPVA film was much higher than that of PVA. The wide angle X-ray diffraction (WAXD) pattern showed a higher molecular o…
Twenty-five silver cones were removed from teeth which had been treated endodontically from 3 months to 20 years previously. Examination by the scanning electron microscope revealed that these cones were moderately to severely corroded. The corrosion patterns were described as ranging from pitting to deep crater forma…
A quantitative statistical study was done on digitized atomic force microscope (AFM) images of La2/3Ca1/3MnO3 thin films grown on (001) oriented SrTiO3 substrates. The films were grown via sputtering technique at high oxygen pressures and at substrate temperatures of 850 �C. The films where characterized by resistivit…
We propose the simple codoping method for improving the productivity of silicon single-crystal growth by controlling axial specific resistivity distribution. Numerical simulations have been performed to study the transport phenomena of dopant impurities in conventional and proposed Bridgman silicon growth using the fi…
Summary After upgrading the Pakistan Research Reactor-1, the amount of liquid waste and its increased radioactivity content necessitated a pre-disposal treatment to bring the activity down to disposal limits. Amongst several radionuclides in the waste, 110m Ag and to some extent 124 Sb were of our concern due to their…
This article provides guidance for initiating, opening and controlling cracks during testing of an anchor for use in cracked concrete. The forming of cracks in a concrete test member can be accomplished by three different methods. All three methods apply load to the concrete member's reinforcing bars, which elongate e…
The structural and magnetic properties of Ni/sub 2/MnIn films deposited onto glass substrates were investigated. Two sets of films with distinct structural orders were prepared. The films deposited at an elevated temperature (730 K) have an ordered structure and are ferromagnetic, while those deposited at a low temper…
Over the years many investigations have been performed to choose materials suitable for radioactive waste containers and to characterise their long-term corrosion behaviour in contact with potential disposal environments (e.g. salt, clay and granite). Carbon steels, stainless steels, nickel-based alloys, titanium-base…
Five organic volatile corrosion inhibitors (VCIs) were synthesized using 2-Dec-9-enyl-2-imidazoline with various acids such as maleic acid, orthophosphoric acid, nitrobenzoic acid, phthalic acid and cinnamic acid and evaluated as corrosion inhibitors of mild steel, brass and copper by weight loss method. Eschke test m…
The thermoelectric power of silicon micro-samples grown by Czochralski method (Cz-Si) and annealed at 450 °C has been investigated at enhanced pressure up to 16 GPa. The correlation has been established between the thermoelectric power and pressure of the semiconductor-metal phase transition, on the one hand, and mech…
The main objective of this study is to investigate the air flow and effect of several parameters on weft insertion, and thus to provide a valuable guide for both air-jet weavers and researchers by establishing a better understanding of air-yam interactions in air-jet weaving machines. Air pressure and velocity are mea…
BACKGROUND: Periodontal ligament (PDL) cells, connecting root cementum with alveolar bone, are important for periodontal wound healing. In order to obtain a predictable periodontal regeneration, selective adhesion and proliferation of PDL cells are essential. The purpose of this study was to investigate the effects of…
Uniform magnetization (dc) noise is studied using numerically generated arrays of grains. The effects of packing fraction, grain size distribution, and anisotropy orientation are examined. From electron microscopy results, in this initial study, the intergranular grain boundary separation is held fixed. In general, th…
We investigate the related strength properties of 3D solid orthogonal fabric panels under conditions of low strain, then analyzes the response of these fabrics to low tensile loads. We also determine how it is possible to deduce the tensile properties of 3D solid orthogonal fabrics panels from the known properties of…
Dielectric relaxation behavior of a ferroelectric liquid crystal (Felix-15/100) showing SmC * –SmA phase transition have been reported. Thickness dependent dielectric constant measured by varying the cell thickness (∼6, 11, 18, 36, 59 and 79 µm) showed increase of dielectric constant and the ferroelectric transition (…
Ferroelectric Bi3.25La0.75Ti3O12 (BLT) thin films were fabricated by a metalorganic decomposition deposition aimed at investigating the thickness effect on ferroelectric properties. Both the grain growth behavior and ferroelectric properties (dielectric constant, remanent polarization) were found to be dependent on th…
Several prediction models for internal corrosion of oil and gas pipelines have been developed. Some of the models are based on mechanistic modelling of the different processes involved, while other models are mainly based on empirical correlations with laboratory or field data. The models have very different approache…
An energetic model is used to calculate macroscopic magnetization behavior of thin Permalloy films. Therefore it is extended by magnetocrystalline anisotropy energy and domain classes that particularly represent magnetization rotation. Some model parameters can be related to coherent rotation of domain magnetizations.…