Materials Literature
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The development of new methods for obtaining materials with predetermined operational properties that ensure the durability and the wear resistance of friction units is an urgent problem in modern material science. The article considers the effect of ultrasonic pressing modes with simultaneously superimposed low-frequ…
The problem of determining the drive waveform that produces a desired output from a hysteretic, saturating material is considered both theoretically and experimentally. The specific problem of interest is the production of a high-amplitude, but monofrequency, sinusoidal polarization response. (The techniques presented…
Poly(butylene terephthalate)/polyarylate (PBT/PAr) blends of various compositions were subjected to a series of thermal and mechanical treatments. The evolution of the structure together with the static mechanical properties of produced fibers were investigated. It was found that zone drawing-zone annealing at 140 and…
Das Verhalten verschiedener Halbzeugformen aus sechs austenitischen Sonderedelstählen und Nickelbasislegierungen im Lieferzustand wurde in einigen Standardkorrosionstests geprüft. Dabei wurde die Beständigkeit gegenüber interkristalliner Korrosion an den Halbzeugformen Blech, Band, nahtloses und Längsnaht-geschweißtes…
Protein Science, the flagship journal of The Protein Society, serves an international forum for publishing original reports on all scientific aspects of protein molecules. The Journal publishes papers by leading scientists from all over the world that report on advances in the understanding of proteins in the broadest…
We have investigated the deposition conditions for a SiO 2 insulation layer, such as the substrate-target length, Ar pressure and applied RF power density, using both RF magnetron facing target sputtering and the conventional RF sputtering techniques. We have fabricated an SiO 2 layer having with a good surface smooth…
The application of thermal barrier coatings (TBC) is increasing in aeroengines. Surface temperatures up to 1450°C require the application of ceramic TBCs because the temperature capability of metallic substrate materials is not high enough. The service life of turbine components could be improved by the use of yttria…
In India, many vegetable fibres, having good potentiality, are not being properly exploited. If these fibres are put to proper use, the rural economy of the country cou Id be improved significantly. One of these is the wildly grown fibre crop(Leptadenia pyrotechnic), belonging to the family 'Asclepiadaceae' and is pop…
A new class of biodegradable polyampholytes, poly[(aspartic acid)-co-lysine], were synthesized by thermal polycondensation of aspartic acid and lysine under reduced pressure and subsequent hydrolysis. Polymerization conditions were optimized to yield maximal water-soluble poly(succinimide-co-lysine) with high molecula…
Tin oxide films were grown by Chemical Vapor Deposition (CVD) on glass and Si substrates at atmospheric pressure (AP) and temperatures varying between 430 and 580 degreesC in a cold wall orizontal reactor, radiatevelly heated, by oxidation of SnCl4 vapors with O-2. The structure of SnO2 thin films has been studied by…
Physical properties, i.e. phase transition temperatures, response times, Ps values, tilt angles, helical twisting powers and helical twisting senses of a series of novel ferroelectric liquid crystalline compounds with non-substituted and halogen-substituted dispiro[2.0.2.1]heptyl moieties in their side chains have bee…
Polynaphtylmethacrylates (PNMA) are considered as a new class of liquid crystal (LC) photoaligning polymers. The films of PNMA irradiated with polarized UV light provide high quality LC alignment with the easy axis oriented perpendicularly to polarization direction of the exciting light. A maximal value of the azimuth…
The temperature behavior of the low-frequency Raman spectra of vitreous and supercooled liquid benzophenones is investigated experimentally. The structural phase transformations are studied by differential scanning calorimetry. The results obtained suggest that the structure of glasses involves nanometer-sized fragmen…
A two-level factorial design was employed to analyze the influence of agitation, contact time, amount of algae and type of pretreatment on heavy metal removal by Arribadas algae, in a batch system consisting of a synthetic solution simulating a typical effluent from battery manufacturing processes. Dried, ground and s…
Photo-induced magnetic phase transitions observed in Co—Fe Prussian blue analogues are discussed from a theoretical point of view. In this material a magnetization is induced by visible light, and the induced magnetization can be completely diminished not only by thermal annealing but also by irradiation of infra red…
We have synthesised a new class of compounds incorporating a trifluoromethyl group in the terminal alkoxy or alkenyloxy chain. Compounds containing several aromatic rings were synthesised with a view to producing compounds of high birefringence. This also included the synthesis of compounds containing a carbon-carbon…
In this work, a methodology is proposed to predict the fracture behaviour of multilayer ceramic systems subjected to thermal shock conditions. The statistical variability exhibited by the fracture behaviour of three-layer structures used in solid oxide fuel cells under transient thermal stresses is determined. The dom…
Abstract The NO x species formed after NO adsorption and NO + O 2 co‐adsorption on Co‐ZSM‐5, CoY, Co/SiO 2 (high cobalt dispersion) and Co/SiO 2 (low cobalt dispersion) were studied by means of IR spectroscopy. It was found that NO adsorption on all samples leads to the formation of Co 2+ (NO) 2 species, which are sta…
We have measured the absorption spectra and the dispersion of refractive index for porous silicon samples with different porosities in the energy range 1.5–3.5 eV at room temperatures. The experimental data are compared with the dependences calculated by using Bruggeman’s theory for the dielectric constant of a multic…
Epitaxial thin films of a half-metallic ferromagnet Sr 2 FeMoO 6 have been grown on (001) SrTiO 3 , and MgO substrates by magnetron sputtering in Ar+H 2 mixture gas. Their structural, magnetic, magneto-optical and transport properties at room temperature were investigated and compared. Large difference has been observ…