Materials Literature
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The domain structure of ferroelectrics changes during poling has a direct influence on the macroscopic properties of the materials. The intensity variation of the different X‐ray diffraction (XRD) pattern profiles was used to identify the percentage of 90° domain reorientation in the tetragonal phase of Pb(Mg 1/3 Nb 2…
Abstract The present work deals with the synthesis of Na-A zeolite using 10 Å halloysite (collected near Grosseto, Italy) as the starting material, instead of the more expensive chemicals currently used in industry (Na aluminates and Na silicates). The process of synthesizing Na-A zeolite from 10 Å halloysite is rathe…
Abstract In this work, structural features and optical properties of CuPcF 16 films deposited by physical vapour deposition have been investigated. Thin films of two different thicknesses (22 and 198 nm) were characterized by ellipsometry, optical absorption spectroscopy and scanning electron microscopy. Film morpholo…
The antifungal activity of a crude steroidal glycoside extract from Yucca gloriosa flowers, named alexin, was investigated in vitro against a panel of human pathogenic fungi, yeasts as well as dermatophytes and filamentous species. The minimal inhibitory concentration (MIC) was determined by an agar dilution method. A…
Transcription of the hupSL genes, which encode the uptake [NiFe]hydrogenase of Rhodobacter capsulatus, is specifically activated by H(2). Three proteins are involved, namely the H(2)-sensor HupUV, the histidine kinase HupT and the transcriptional activator HupR. hupT and hupUV mutants have the same phenotype, i.e. an…
We present a model of radiation-induced segregation (RIS) at the grain boundary (GB), treating both segregation produced by interstitials and segregation due to vacancies. Predicted kinetics of RIS in austenitic steels reveal how thermodynamic properties control the formation of a transient ‘W-shaped’ profile, the osc…
Transmittance characteristics were studied as a function of cell gap for a homogeneously aligned liquid crystal (LC) cell driven by a fringe‐electric field—named fringe‐field switching (FFS) mode. The light efficiency of a conventional LC cell using in‐plane switching and twisted nematic modes, where the LC director i…
Abstract Polycrystalline LaMn 2 O 5 has been studied by neutron powder diffraction in conjunction with magnetization data. The crystal structure of this oxide contains infinite chains of edge‐sharing Mn 4+ O 6 octahedra, interconnected by Mn 3+ O 5 pyramids and LaO 8 units. Susceptibility measurements show that LaMn 2…
The objective of this work was to develop a model to describe pipeline corrosion within a disc-shaped crevice in the presence of oxygen (O2). The model results from modification of the pipeline crevice corrosion model (PCCM) previously developed for pipeline corrosion in a rectangular crevice. The present study compar…
An iron sulfate of nominal composition Fe 2 (SO 4 ) 3 (H 2 O) 5 has been synthesized and its structure determined and refined by high resolution powder diffraction using synchrotron radiation. The structure consists of corrugated slabs in which iron octahedra are linked by sulfate tetrahedra in the monoclinic space gr…
A uniform BaTiO 3 nano layer was coated on spherical Ni particles for multilayer ceramic capacitor applications via a Ti‐hydroxide coating using the controlled hydrolysis of a TiCl 4 butanol solution containing (C 2 H 5 ) 2 NH (diethylamine, DEA) and its subsequent hydrothermal reaction at various [Ba(OH) 2 ], residua…
Aniline was selectively converted into the corresponding nitrosobenzene and nitrobenzene by oxidation with 30% aqueous hydrogen peroxide. The reaction was catalyzed by various heteropolyoxometalates, at room temperature, in dichloromethane under two-phase conditions. Findings show that H3PW12O40 is the best catalyst i…
The weakening of the fatigue strength of turbine blades due to local impact damage caused by foreign objects (Foreign Object Damage ‐ FOD) represents a significant safety risk in modern civil and military aviation. It is possible to employ deep rolling to counteract such component weakening in a particularly effective…
Crack advance has been studied in an X-70 pipeline steel, using the compliance technique. The electrolyte used in the study was a very dilute brine bubbled with 10% carbon dioxide (CO2). Cracking rates were studied at a range of frequencies and R-values (R is stress ratio). The R-values simulated typical high-pressure…
ZnS thin films were prepared by spray pyrolysis technique using aqueous solutions of zinc chloride and thiourea at molar ratio of 1:1, 1:2 and 2:1. The films were characterized by XRD, FTIR, SEM and EDX. The phase composition, structure and morphology of sprayed films are controlled by both, the substrate temperature…
We report on the fabrication of ZnO:N by thermal oxidation of sputter-deposited zinc nitride. Through optimising several technological steps we achieved p-type conductivity with carrier concentration in mid 1017 cm–3 range and mobility of ∼10 cm2/Vs. PL spectra of p-type ZnO:N films show a sharp peak at 3.36 eV, most…
In this paper, we quantitatively investigated the impulse conditioning mechanism under nonuniform electric field electrodes in a vacuum. A negative standard lightning impulse voltage was applied between rod and plane electrodes whose materials were Cu-Cr, stainless steel and Cu and the gap lengths were d=5 and 10 mm,…
Lyapunov modes are periodic spatial perturbations of phase-space states of many-particle systems, which are associated with the small positive or negative Lyapunov exponents. Although familiar for hard-particle systems in one, two and three dimensions, they have been difficult to find for soft particles. We present co…
A new centric diatom genus is described from laminated freshwater sediments of Middle Eocene age near Horsefly, British Columbia, Canada. This diatom, Eoseira wilsonii gen. et sp. nov., grew in filaments that constitute dense monospecific sub-horizons within the white couplets that represent summer deposition in the v…
Reaction of NH4VO3 with sulfur dioxide affords the hexanuclear cluster (NH4)2(Et4N)[(V(IV)O)6(mu4-O)2(mu3-OH)2(mu3-SO3)4(H2O)2]Cl x H2O (1), and the decapentanuclear host-guest compound (Et4N)5{Cl subset [(VO)15(mu3-O)18(mu-O)3]} x 3 H2O (2). Sequential addition of magnesium oxide to an acidic aqueous solution of NH4V…