Materials Literature
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El ensamble perifitico es un componente poco conocido en los ecosistemas tropicales, por lo que se estudio su variacion respecto al pulso de inundacion en un lago de plano inundable (cienaga). Se realizaron cinco muestreos en el ciclo hidrologico entre mayo de 2006 y 2007. Se encontraron 114 taxones diferentes siendo…
Bauxite mainly consists of the major minerals gibbsite, boehmite, diaspore, kaolinite, quartz, goethite and hematite. Large quantities of bauxite often occur in the form of small balls (pisolites). Mineralogical analyses of ores can be complicated, especially when minerals of very similar elemental composition are pre…
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Luminescence spectra in liquid crystalline (LC) solvents were measured for stilbene, p-terphenyl, o-POPOP, 2-(1-naphtyl)-5-phenyloxazole and other compounds commonly used as luminophores or scintillators. The choice of substances was prompted by the ability of their molecules to assume different predominant conformati…
The goal of this work is to analyse the influence of hydrothermal degradation on wear behaviour on samples of tetragonal polycrystals doped with 3% molar of yttria in air under dry sliding conditions on samples artificially aged at 0, 10 and 60 hours in autoclave at 131°C. The samples were prepared by conventional com…
A methodology for analyzing problems of static and dynamic deformation of pipeline systems on supports with nonlinear characteristics is introduced. The solution of the problems is sought in the form of decomposition according to the types of static deformation and self-oscillation. The decomposition coefficients act…
Effect of Microstructural Parameters on the Wear Properties of High Volume Ceramic Reinforced Metal Matrix Composites
The uniform surface mechanical-chemical corrosion of a linear-elastic thick-walled pipe loaded by a longitudinal force and the pressure of aggressive media of various temperatures is analyzed. The corrosion rate is assumed to depend linearly on the maximum principal stress and exponentially on the time and temperature…
The effect of hydrogen exposure on high strength steel SCM435 with a sharp notched specimen was investigated. Tensile tests were carried out in hydrogen gas and in helium gas environments. In hydrogen gas environment, the specimen which was not exposed to hydrogen gas and the specimen which was exposed to hydrogen gas…
with the peak power loads on divertor targets will be unacceptable high for the given choice of plasma facing materials, namely Be and W. The JET first wall and divertor plasma facing components, currently made of carbon fibre-composite, will be substituted by similar plasma facing components made of beryllium and tun…
Objective To investigate the effect of penetration enhancers on the percutaneous absorption of artesunate,and provide a reference for the development of artesunate transdermal delivery systems.Methods Penetration enhancers(in different concentrations) were incorporated into a 25% w/w artesunate matrix patch formulatio…
Reaction of aqueousmetal (Ni(II),Co(II), Cd(II), Zn(II), Cu(II) andMn(II)) nitrate/ acetate solution with an aqueous solution mixture of hydrazine and 2-hydroxy - 1- naphthoic acid yielded the complexes with formula, (N2H5)2[M{C10H6(COO)(O)}2(H2O)2] whereM(II) = Ni, Co, Cd, Zn, Cu and Mn in the pHrange of 4-7 and [M(N…
The paper approaches the environment issue in the context of welding fabrication processes.The introduction presents, synthetically, the place and dimension of welding in the manufacturing industry.Negative aspects regarding the image of welding due to the impact on the environment are identified.The driving factors a…
Vrste konstrukcijskih polimernih materijala. rednosti, nedostaci i karakteristicna svojstva. Specificnosti konstruiranja s polimernim materijalima. Primjeri konstrukcijskih primjena.
This paper discusses the formation of complex geometry electrode structures on piezoelectric ceramic substrates using nanosecond pulsed laser ablation. Optical microscopy, scanning electron microscopy and surface profiling are used to examine the impact of the laser ablation process onto the substrate material. The in…
The synergistic combination of polymers and inorganic compounds via sol-gel process has attracted great attention, by manipulating structure at molecular level, for developing new materials with desired properties.These new hybrid materials could have a controllable combination of the benefits of polymers (flexibility…
Welding residual stress is occurred after welding process. Tensile residual stress is one factor of PWSCC. Repair welding usually happened during the manufacturing welding process. Repair welds cause strong tensile residual stress. In PWR, Repair weldments made by Alloy 82/182 is susceptible to PWSCC caused by tensile…
CalciummodifiedBaTiO3 (BT) ferroelectric systemwas synthesized by partial precipitation route. For single perovskite phase and dense grain morphology formation 9000Cand 13000C temperatureswere optimized as calcination and sintering temperatures, respectively. Dense packing of grains with average grain size i¾13.3i…
A water-emulsified terpinene-maleic ester type epoxy resin (TME) was prepared by phase-inversion emulsification,and a self-designed emulsifier prepared by TME modified with PEG was used as reactive emulsifier in this emulsion. The relationship between conductivity and micro-morphology in the emulsifying process was an…
The present tendency of the mining industry to design and evolve their production systems to minimise the use of water has resulted in the need for an assessment of efficient paste and thickened tailings disposal sites. This paper proposes a dimensionless variable and a length model for slow laminar Bingham flows. Res…