Materials Literature
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A total number of (32) marl samples of Fat'ha Formation (Middle Miocene) was collected from four selected localities in northern Iraq. Geochemical study included the analysis of (13) major and minor oxides by x-ray fluorescence and wet chemical methods and (7) trace elements by (XRF). The study shows that the oxides (…
New modified alkyd resin compositions containing Egyptian bentonite ore (high grades) are evaluated as anticorrosive coating compositions for steel protection. The results indicated substantial corrosion inhibiting properties.
Abstract The synthesis and potential applications of functional, branched polyethers prepared by cationic ring-opening polymerization is reviewed, mainly on the base of the work from the author’s laboratory. Polymerization of cyclic monomers of ABx type, including highly strained 3- and 4-membered as well as weakly st…
Abstract Structure refinement of a water quenched alloy of Al 72 Ni 20 Co 8 , which is known as a highly ordered decagonal quasicrystal, has been carried out by quantitative comparison of experimental and simulated intensities of convergent-beam electron diffraction (CBED) patterns. In the present study, higher-order…
A review is presented of the application of the Mssbauer spectroscopy to the study of quasicrystals. The usefulness of the Mssbauer spectroscopy to solving the atomic structure of a complex icosahedral system is illustrated. The role of the Mssbauer spectroscopy in studies of magnetism of quasicrystals is discussed. T…
Pink light emission has been demonstrated from the hybrid CdSe/ZnS quantum dot-InGaN/GaN quantum well light-emitting diodes (LEDs). The QDs in toluene are blended in the resin matrix to become the nanophosphor. For the fabricated hybrid LED, it is found the light output power is greatly reduced due to the poor quantum…
SiAlON-cubic boron nitride (cBN) composite was prepared by spark plasma sintering (SPS) using -SiAlON and cBN powders as starting materials, and the effect of holding time on densification, phase transformation and hardness of the composite was investigated. The SiAlON-cBN composite containing 20 vol% cBN sintered…
X-ray powder diffraction data for two ionic salts containing imidazole (Him) complexes of the magnesium(II) ion, [Mg(Him) 4 (H 2 O) 2 ]Cl 2 and [Mg(Him) 6 ](NO 3 ) 2 , are reported. Their crystal and molecular structures were determined by simulated annealing and full-profile Rietveld refinement methods. [Mg(Him) 4 (H…
Abstract Neben Zuverlässigkeit und Qualität sind vor allem Fahrzeugsicherheit und Wirtschaftlichkeit entscheidende Kriterien für den Automobilhersteller. Der Korrosionsschutz spielt dabei eine herausragende Rolle, da hierdurch die Lebens‐ und Gebrauchsdauer erhöht wird. Mit der Bereitstellung höchstfester Stahlqualitä…
Dois tipos de aços inoxidáveis com diferentes proporções de austenita e ferrita foram deformados em torção em temperaturas variando de 900 a 1250°C. O aço A (25,5Cr - 4,9Ni - 1,6Mo) tem Cr eq/Ni eq = 4,8 e o aço B (22,2Cr - 5,6Ni - 3Mo) tem Cr eq/Ni eq = 3,5. Os resultados mostraram que a forma da curva de escoamento…
Abstract The Avrami equation has been extensively used to describe the polymer crystallization kinetics. Evaluation of kinetic parameters of this equation is quite troublesome, calling for properly predetermining induction time. To avoid this problem, an analytical approach in terms of differential scanning calorimetr…
Abstract Depolymerization of poly(ethylene-terephthalate) (PET) in PET/HDPE blends, obtained from virgin polymers during mechanical recycling was studied. Extrusion of PET/HDPE blends was simulation of the first cycle of recycling and extrusion of the blends with EPDM/HDPE (E-M) masterbatch and HDPE/EPDM (PEM) masterb…
The necessity for creating a separate abstract journal on the physics of nanoobjects and nanotechnology, which is a new rapidly developing interdisciplinary knowledge field, is substantiated. The first successes in nanotechnology promise a new scientific-technical revolution. Physics is one of the fundamental bases of…
In this work, polycrystalline Cu(Ag) bulk alloy (1 wt.% Ag) and Ag/Cu(100) surface alloy (0.9 ML Ag) have been characterized by x-ray photoelectron spectroscopy (XPS) employing Al Kα and Mg Kα radiation. XPS spectra of the principal core levels (Cu, Ag) are presented together with XAES (x-ray induced Auger electron sp…
The influence of diamond-like carbon coatings on the corrosion resistance of zirconium is investigated. Zirconium films with a thickness of 20 nm and different thicknesses of carbon protective films are examined. The chemical state of atoms on the surface is characterized using the measured photoelectron, electron ene…
Abstract In order to model macrosegregation, one must consider convection and the partitioning of the segregating elements at the dendritic length scale. This article describes microsegregation with diffusion in the solid. It presents a continuum model of macrosegregation and illustrates the simulation of macrosegrega…
The reliability of the power system mainly depends on the environmental and weather conditions which cause flashover on polluted insulators leading to system outages. It is generally recognized that the main causes leading to the contamination of insulators are marine pollution found in the immediate neighborhood of t…
Abstract Zur Eigenschaftsoptimierung thermisch gespritzter Schichten stehen verschiedene Nachbehandlungsverfahren zur Verfügung. In dieser Arbeit wird die plasmaelektrolytische Oxidation lichtbogengespritzter Aluminiumschichten auf Aluminiumsubstraten vorgestellt. Der Verschleißwiderstand der oxidierten Schichten wird…
The issue of nanodielectrics has recently become an important field of interest. The term describes nanometric dielectrics, i. e. dielectric materials with structural dimensions typically smaller than 100 run. In contrast to the behaviour of a bulk material the nanodielectrics can behave completely different. With shr…
About 150 accessory minerals have been identified in the rare-metal-rare earth pegmatites, including 36 OH-, F- and H 2 O-bearing silicates, 27 volatile-free silicates, 31 complex oxides, and 17 carbonates. Most accessories contain Y and Ce, and a few, certain other REEs. This diversity is a result of multistage postm…