Materials Literature
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Abstract Complex formation of boric acid with diol functional groups is well known and many papers have been published assuming borate is the reactive species. Based on the high reactivity of boric acid towards nucleophiles, this paper assumes boric acid is the reactant. We prove this hypothesis by presenting a study…
The effects of graphite surface geometrical deformation on the dynamics of conducting electrons are investigated theoretically. The analysis is performed within the framework of a deformation-induced gauge field and corresponding deformation-induced magnetic field. It is shown that the latter gives a local energy gap…
We describe in this paper an easy route to the synthesis of a novel surface-functionalized conducting polyaniline-chitosan nanocomposite. A stable colloidal dispersion was prepared when aniline was polymerized in the presence of chitosan as the steric stabilizer. TEM study shows that these surface-functionalized polya…
Organophilic clays were prepared using a bentonite from the town of Boa Vista, state of Paraíba, Brazil, and a quaternary ammonium salt (Genamin CTAC-50). The materials obtained were characterized by X-ray diffraction and infrared spectroscopy. The results showed a good gasoline, toluene, diesel fuel and kerosene adso…
BACKGROUND: This paper provides an overview of initial research conducted in the development of pressure-sensitive foam and its application in wearable sensing. The foam sensor is composed of polypyrrole-coated polyurethane foam, which exhibits a piezo-resistive reaction when exposed to electrical current. The use of…
Solar Turbines Incorporated, under U.S. government sponsored programs, has been evaluating ceramic matrix composite combustor liners in test rigs and Solar’s Centaur® 50S gas turbine engines since 1992. The objective is to evaluate and improve the performance and durability of CMCs as high-temperature materials for ad…
Abstract. Fertilizer and manure application rate and timing are often based on the optimal nitrogen rate and not on potassium (K) requirements. This can lead to excess or shortage of K depending on the crop and rotation. In grass‐dominated agricultural production, including many organic farming systems, K has become a…
We have used confocal fluorescence microscopy with single molecule sensitivity to characterize uptake and release of fluorescent protein (mEosFP) molecules by individual spherical polyelectrolyte brush (SPB) nanoparticles that were immobilized on a glass surface. The SPB particles consisted of a solid core particle of…
Summary The research reported in the present paper focused on the behaviour of the Miocene sandstone used to build the Roman aqueduct at Zaghouan-Carthage and other Tunisian Heritage monuments, after application of water repellent and consolidating treatments as a preliminary to restoration. Commercial consolidants an…
In this paper we present a theoretical analysis of the effect of magnetostriction on quantum oscillations of elastic constants in metals under strong magnetic fields. It is shown that at low temperatures a significant softening of some acoustic modes could occur near peaks of quantum oscillations of the electron densi…
Lattice diffusion and internal local magnetic field gradients in solids are investigated by numerical simulation of nuclear mangetic resonance(NMR) spin echo experiments. The Fourier-spectrum method is employed in order to solve the Bloch-Torrey equation with arbitrary magnetic field gradients in one- and two-dimensio…
In situ EXAFS has been used to examine the hydrogen effect on the selective catalytic reduction of NOx over silver/alumina catalysts. For all SCR conditions used, with or without co-reductant (H2 or CO), the catalyst structure remained the same. Significant changes in the catalyst were only found under reducing condit…
The scope of the present work was to investigate the influence of surface properties of corrugated heat exchanger plates on calcium sulpate crystallization fouling from aqueous salt solutions. The applied surface treatment technologies for the heat exchanger plates are ion beam implantation, ion sputtering, carbo-nitr…
Abstract Composition‐tunable Zn x Cd 1– x S alloyed nanocrystals have been synthesized by a new approach consisting of thermolyzing a mixture of cadmium ethylxanthate (Cd(exan) 2 ) and zinc ethylxanthate (Zn(exan) 2 ) precursors in hot, coordinating solvents at relatively low temperatures (180–210 °C). The composition…
The mesoporous TiO(2) solid and hollow spheres have been synthesized via a controllable and simple chemical route. Structural characterization indicates that these TiO(2) mesoporous spheres after calcined at 500 degrees C have an obvious mesoporous structure with the diameters of 200-300 nm for solid spheres and 200-5…
The effects of amount of pore former used to produce porosity in the anode of an anode supported planar solid oxide fuel cell were examined. The pore‐forming material utilized was rice starch. The reduction rate of the anode material was measured by Thermogravimetric analysis to qualitatively characterize the gas tran…
Os mecanismos envolvidos no processo de reparo de tecidos estão revisados nesse trabalho. O processo de cicatrização ocorre fundamentalmente em três fases: inflamação, formação de tecido de granulação e deposição de matriz extracelular e remodelação. Os eventos celulares e tissulares de cada uma dessas fases estão des…
DNA base-gold interactions are studied theoretically at the DFT level using Au(3) and Au(4) clusters as simple catalytic models for Au particles. The bonding between DNA bases and gold clusters occurs via the anchoring of a Au atom to the N or O atoms of the bases. In the most stable planar base-Au(3) complexes, the A…
The sulfuric acid dew corrosion- resistant steels are low alloying steels for heat exchanging component. There are two kinds of sulfuric acid dew corrosion- resistant steel:(1)base alloy elements-0.2%～0.5%Cu-＞0.010S adding a small quantity P,Sn,As, Sb,Se, or Te;(2)Cu-Cr or Cu-Cr-Ni steels for corosion environ ment of…
The numerical simulation of molten steel flow field in a 40 t tundish for alloy steel billet concasting at Shijiazhuang lron and Steel has been carried out using Computational Fluid Dynanics (CFD) software PHOENICS to modify the one weir structure which influence molten steel flowing to improved one weir and one dam s…