Materials Literature
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Two systems were studied on high-resolution neutron time-of-flight powder diffraction (HRDP), a totally B-site disordered ceramic disk of Pb2ScNbO6, and a partially ordered ceramic block of Pb2ScTaO6. We found Pb2ScNbO6 to be fully disordered, space group Pm3m with lattice constant 4.08153(1)Å, whereas Pb2ScTaO6 was f…
Novel graphitic spheres with a shell structure of curved graphene layers were discovered as a side product of fullerene synthesis. The Raman spectra of these carbon spheres with typical sizes of 20–500 μm have been found to be similar to that of micro-crystalline graphite. The silent low-frequency B1g(1) phonon of gra…
This paper provides the failure analysis of a three-phase, dry-type, silicone resin vacuum-pressure encapsulated, 750/1000 kVA, AA/FA, 34.5 kV-480 Y/277-V, delta-wye power transformer. Transient overvoltage switching surge propagation through the transformer winding and protection margin is discussed. An arbitrary sen…
Chitosan's linear structure, cationic charge and high molecular weight can help it improve dermatological compatibility and feel of formulations, give limited antimicrobial properties. and offer advantages over synthetic haircare polymers.
In a previous work (Trchounian et al., Biol. Membrany 16:416-428 (1999) (in Russian)) we reported the interrelations between production of H2 and H+-K+ exchange in fermenting Escherichia coli grown under anaerobic conditions at pH 7.5. The ion fluxes had stable stoichiometry 2H+/K+ and were N,N'-dicyclohexylcarbodiimi…
The crystal structure of (OMTTF)2[Ni(tdas)2] (OMTTF = octamethylenetetrathiafulvalene and tdas = 1,2,5-thiadiazole-3,4-dithiolate) was solved as the second example of an M(tdas)2 (M = transition metal) complex with TTF derivatives. The structure consists of a dimer of the radical cation of the OMTTF molecules and the…
The copper coordination geometry in the blue copper proteins plastocyanin, nitrite reductase, cucumber basic protein, and azurin has been studied by combined density functional (B3LYP) and molecular mechanical methods.Compared to quantum chemical vacuum calculations, a significant improvement of the geometry is seen (…
Using the maleic anhydride as the anti-crinkle agent and nano-silica as the catalyzator, suitable amounts of emulsifier and osmosis agent were added to the solution for the anti-crinkle treatment of silk. The effect of the concentration of nano-silica and drying time were examined. Taking the restoring angle of the cr…
plantat -Inkubation Zur Abschätzung der in-vivo-Stabilität von plasmagespritzten Hydroxylapatit-Beschichtungen auf Knochenimplantaten wurden Langzeitversuche (bis 56 Tage) in proteinfreier simulierter Körperflüssigkeit nach Kokubo durchgeführt. Sowohl reine als auch Mangan-dotierte Hydroxylapatit-Schichten wurden durc…
Preferential precipitation on dislocations has been discussed by considering interaction energy between transformation strains to change the crystal structure and stress fields around dislocations. For quantitative calculation, precipitation of the hcp α phase from the bcc β matrix in a Ti alloy is analyzed. A previou…
The conventional strawboard technology employing MDI binders has shown technical and economical disadvantages, specifically, high resin costs and additional costs related to release agents required to avoid sticking of panels to press plates. The adhesion of urea formaldehyde (UF) resin to the straw fiber has been dem…
Neural Network (NN) and actual frequency transplantation (AFT) are combined for prediction of dynamic hysteresis when the exciting field, H(t), is highly polluted by harmonics. The NN forecasts the Fourier Series for flux density for well-known H(t) waveforms (i.e., triangular, square wave fields etc.). The task of AF…
The effect of Xe+ bombardment on the surface morphology of four different polymers, polystyrene (PS), poly(phenylene oxide), polyisobutylene, and polydimethylsiloxane, was investigated in ion energy and fluence ranges of interest for secondary ion mass spectrometry depth-profiling analysis. Atomic force microscopy (AF…
The type specimens of Perenniporia contraria and of its presumed taxonomic synonym, Fomes subannosus, have been revisited. In addition, some recent collections identified as P. contraria have been re-examined, demonstrating that the present concept of the latter taxon is confused. The species is illustrated and its co…
Some Keggin-structural (hetero)polyoxotungstates with a lacunary hole, such as undecatungstosilicate ([SiW11O39]8-, SiW11), greatly sensitize methicillin-resistant Staphylococcus aureus (MRSA) to beta-lactams. In this study, the effects of lacunary-substituted derivatives of SiW11 were tested to determine if the lacun…
Na- or K-substituted PrMnO3 and NdMnO3 phases have been prepared using neutral NaCl or KCl fluxes at a relatively low temperature of 900 °C. These flux syntheses not only promote the reaction at low temperatures but also act as a source of the alkali metal in the final product. The structures of these oxides have been…
The effect of a pi-electron-donating macrocyclic molecule on the photochromic behavior of viologen derivatives was investigated in a thin polymer film. The intermolecular interactions between the viologens and the macrocyclic molecule were investigated in a solution before photoirradiation. In acetone, benzylviologens…
The thermoelectric properties of dense Fe1-xMnxSi2 (0.00≤x≤0.10) fabricated by spark plasma sintering have been characterized in the temperature range between 300 and 1150K. Fe1-xMnxSi2 is p-type over the measured temperature range. The electrical resistivity (ρ), Seebeck coefficient (S) are strongly affected by the M…
This paper discusses the application of confocal laser scanning microscopy for the investigation of corrosion processes on aluminum alloy AA2024-T3 occurring beneath a transparent organic coating. The ability of the microscope to monitor the topography of both the alloy surface under the coating and the surface of the…
The objective of the current study was to investigate the relationship between polymer adhesion and post-coating thermal treatment. A novel adhesion technique was used to quantify the adhesive properties of applied acrylic films. Differential scanning calorimetry was used to determine the glass transition temperature…