Materials Literature
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Abstract This article examines the high-temperature oxidation of silica-forming ceramics under constant temperature and cyclic conditions. The effects of water vapor, impurities, and molten salts are discussed. The article describes the oxidation and corrosion of silica-forming composites, oxide ceramics, non-silica f…
Abstract The effect of the acidity of the environment on the topography and photophysics of sensitizer molecules in homogeneous solutions, and when embedded in a lipid microenvironment, was studied. Four hematoporphyrin (HP) analogs were studied, which have chemical “spacers” of varying lengths between the chromophori…
The data base on the corrosion behavior of Zr alloy materials under BWR conditions was evaluated with respect to the burnup target of 70 MWd/kgU. At high bumups, corrosion rate and the rate of hydrogen pickup (HPU) may increase. This onset of increase obviously depends on the material, but also seems to be significant…
The structure and properties of Cu-Cr-Zr alloy were studied after rapidly solidified aging and solid solution aging.At the early stage of aging (500℃ for 15 min), the hardness and the conductivity of the alloy rapidly solidified are 143 HV and 72% IACS, respectively. Under the same aging condition, the hardness and el…
The sol-gel-derived materials can be exploited for the number of applications, including biomaterials and measuring techniques. One of the most important applications involves production of sol-gel coatings. In this study, silica based sol-gel materials were prepared by way of acid hydrolysis with alcohol as a solvent…
Numerical analyses of birdstrike were performed on aircraft light structures made up in metallic, composite and polymeric materials, using the ESI/Pam-Crash solver code. The finite element models were developed calibrating the material models to take into account the different inelastic behaviours and failure modes. T…
Abstract: The aim of the present paper is to propose a method of laboratory tests to determine non-linear elastic properties of coated Panama fabric. The material parameters are specified on the basis of uniaxial tensile tests in the warp and weft directions. Techniques based on the least squares’ methods are used in…
The long-term stability of anode supported solid oxide fuel cells (SOFCs) was investigated as a function of operating temperature and current density. The largest degradation rate was observed at the lower operating temperature and higher current density of 750°C and 0.75 A/cm 2 , respectively. Detailed characterizati…
The physical and thermal properties of P2O5-Al2O3-BaO-La2O3 glasses were investigated. The effects of glass compositions on the transition temperature, thermal expansion coefficient, density, hardness and refractive index of glasses were studied. The highest hardness of the glasses is 4143.891 MPa and the lowest therm…
The first part of a corrosion inhibitor model has been developed to be used in a specific Mexican Power Plant. The model takes into account the main operational conditions found in the cooling water, such as major corrosive chemical species, a wide pH range, the performance of a commercial corrosion inhibitor (based o…
relatively hydrophilic polyols. This polymer was prepared from polycaprolactone diol (Capa 225), toluene diisocyanate (TDI), 1,4-butane diol (BDO) as chain extender, and dibutyltin dilaurate catalyst. Grafted polyurethane was prepared with chlorinated poly(ethylene glycol monomethyl ether) (PEGMME) in the presence of…
Abstract. We describe two epithermal telluride-selenide bearing Au-Ag deposits: Prasolovskoe and Ozernovskoe, both located within the Kuril-Kamchatka volcano-plutonic belt. Several rare and unknown Te and Se minerals were found at both deposits. At the Prasolovskoe deposit, various Te-Se minerals, including an unnamed…
Six corn starch-LDPE film blends containing starch in the range 5-40 % by weight, oleic acid as a Lewis catalyst with concentration of either 5 % or 10 %, maleic anhydride as a coupling agent with concentration of either 2 % or 10 % and benzoyl peroxide as free radical initiator with concentration of either 0.1 % or 0…
A commercial Al-Mg-Si alloy (Al 6082) was deformed by Equal-Channel Angular Pressing (ECAP) to produce bulk ultrafine-grained microstructure. The crystallite size distribution and the characteristic parameters of the dislocation structure were investigated by X-ray diffraction profile analysis. It was found that the c…
A natural rubber degrading candidate was isolated from a soil sample from Aswan, Egypt. The strain was able to grow on natural rubber as a sole source for carbon and energy. According to its degradation behavior, it grew adhesively and in direct contact with the rubber substrate and led to disintegration of the materi…
Hydroxy and methoxy perylene quinones are synthesized in an attempt to isolate the essential spectroscopic and biological features of light-induced antiviral agents such as hypericin and hypocrellin. Unlike their naturally occurring counterparts, these synthetic quinones bear the carbonyl, hydroxyl, and methoxy groups…
The present paper describes the grain size refinements of an Al–7.8 mass%Mg alloy by hydrogen heat-treatment of so-called Hydrogenation–Disproportionation–Desorption–Recombination (HDDR) process. Upon hydrogenation of the alloys, a disproportionation reaction occurred in forming of MgH2 embedded in Al matrix phases. I…
Nanorods consisting of a polystyrene core and a poly(4-vinylpyridine) shell produced the self-assembly route of comb-shaped supramolecules exhibit very poor mechanical properties. Adding a sufficient amount of poly(2,6-dimethyl-1,4-diphenyl oxide) introduces entanglements to the PS-core resulting in nanorods with much…
Electrochromic polymer films, employed as display elements, smart windows, and the base material for electrochemical electronic devices, can be addressed solely through ionic transport via an electrolyte, without direct electronic connection as typically employed in the above examples. We present a demonstration of in…
Due to the depletion of the ozone layer, shorter but high energy UV-B rays and longer energy UV-A rays causing known skin aging and recently the formation of skin malignant neoplasm are reaching the surface of earth. The paper deals with the influence of different fabric construction on ultraviolet skin protection exp…