Materials Literature
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Promoted ignition-combustion is a term which has been used to describe a situation where a substance with poor oxygen compatibility ignites and supports the combustion of a more resistant material. Previous papers on the subject in recent years have reported on the investigation of this phenomenon as it relates to alu…
An attempt is carried out to produce some tangling and opening parts in multi-filament yarn without conventional interlacers; a truck on which the yarn is fastened at its both ends passes through twice under an air jet nozzle to expose two parts of the yarn to an air jet. The effects of the following factors such as t…
An attempt has been carried out to make tangling and opening parts in a yarn without a conventional interlaces, by running a truck which carries the yarn fastened at its both ends and then by exposing the yarn to an air jet in an instant. The action of the air jet on the yarn has been discussed. Moreover, the effect o…
In this study, short bar fracture toughness samples were used to determine the effects of radiation and hydrogen on the resistance to fracture of vitreous silica and four commercial borosilicate glasses. The results showed that neither exposure to 10 10 rads of γ‐radiation nor saturation to a room‐temperature‐equivale…
Abstract The crystal structure of the complexes of some rare‐earths (RE = La, Nd, Pr and Er) with bis‐ and mono‐(2‐ethylhexyl)phosphoric acids were studied by using the X‐ray powder diffraction. The results show that for all RE investigated, the complexes of the diester crystrallize in orthorombic symmetry and cell pa…
New water-soluble porphyrins having fluorine groups [i.e., 5,10,15,20-tetrakis(2-fluorosulfophenyl)porphine, 5,10,15,20-tetrakis(2,6-difluorosulfophenyl)porphine and 5,10,15,20-tetrakis(2,3,5,6,-tetrafluorosulfophenyl)porphine (TF4SP)] have been synthesised and characterized. Moreover, the spectrophotometric determina…
A closed system hot filament chemical vapor deposition (CVD) reactor has been used to deposit diamond films on silicon substrates. A fixed charge of hydrogen gas is fed into the deposition system until the desired deposition pressure level is reached. A solid graphite cylindrical rod held above the tungsten filament w…
Dans ce travail nous présentons une étude spectroélectrochimique "in-situ" par diffusion Raman de la polyaniline en milieu aqueux acidifié ou non. Ce choix de solvant a permis d'obtenir la forme totalement oxydée (pernigraniline) et de caractériser, en absence d'acide, le dopage par simple oxydation de la leucoémérald…
A sol-gel method is employed to coat an insulating layer of magnesium oxide on a Co-based amorphous alloy ribbon and the effects of surface coating are investigated on the core loss and other magnetic properties of the ribbon. The core loss is found to be reduced significantly by the surface coating, the loss reductio…
The catalytic effect of the oxides V2O5, Fe2O3 and PbO on the air oxidation of graphite has been investigated. Graphite surfaces were contaminated with the oxides by soaking in standard solutions of the metal ions. The oxidation reaction was monitored kinetically, by differential thermal oxidation, and chemically, usi…
Abstract Deoxycholic acid is an important physiological bile acid. The binding of bile salts with metal ions has received more attention due to its clinical significance. In this study, a series of copper and zinc deoxycholate complexes were synthesized. EXAFS and FTIR spectroscopic techniques were used for characteri…
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Grain-oriented KSr2Nb5O15 solid solutions were prepared by hot-pressing. The compositions examined were 0.333 KNbO3-0.667 SrNb2O6 (stoichiometric KSr2Nb5O15, abbreviated as KSN 33/67) and 0.420 KNbO3-0.580 SrNb2O6 (abbreviated as KSN 42/58). The maximum degree of orientation for KSN 33/67 was 0.21 as measured by the L…
This study concerns some aspects of the electrochemical design and characterization of zinc porphyries and anthraquinone-based polymers. The electro-formation of the films on the electrode surface has been achieved by cyclic voltammetry in organic solvents such as dichloromethane and acetonitrile. It is based on the e…
AbstractA literature survey on the corrosion of copper in aqueous solutions, with particular relevance to potable water, is presented. Coverage is of inorganic and physicochemical aspects of copper corrosion, namely those dealing with the thermodynamics of copper corrosion reactions, oxygen reduction at copper surface…
Abstract Erbium pentaphosphate crystals have been characterized and the structure of the orthorhombic polymorph (type III) determined by X‐rays. It has been found that the orthorhombic samples of ErP 5 O 14 , space group Pnma, crystallize mainly at higher temperatures and usually are much larger than monoclinic crysta…
Reduction of an alumina-supported copper catalyst under the conditions used as standard for the reduction of the Cu/ZnO/Al2O3 methanol-synthesis catalysts produces multilayers of hydrogen in the copper. This absorption of the hydrogen results in a reconstruction of the copper with the effect that only the surface hydr…
Recent interest in reducing the environmental impact of materials is leading to the development of newer agricultural based materials that can reduce the stress to the environment. Several billion pounds of fillers and reinforcements are used annually in the plastics industry and their use is likely to increase, to re…
The same fundamental approach that has previously been found reasonably accurate in predicting the tensile behaviour of bulky singles yarns at small extensions of up to 10% is used here to model yarn torsion. The theoretical analysis is based on discrete-fibre-modelling principles, an energy method, and a ‘shortest-pa…
Etherification of both phenolic hydroxyl groups of fluorescein locks the molecule into its non-fluorescent lactone form. Here fluorescein has been unsymmetrically alkylated with a 2-nitrobenzyl ether and one of three variously functionalised alkyl ethers to give compounds 4, 5 and 6. The 2-nitrobenzyl group can be rem…