Materials Literature
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Europium nitride (EuN), which is potentially used as an activator for nitride luminescent materials, was prepared by direct nitridation at 600 °C in a NH 3 atmosphere. X-ray powder diffraction and composition analysis of the nitrided sample were carefully conducted under an oxygen-free environment. The nitrided sample…
Abstract For the purpose of construction of the hydrogen-bonded and coordination-bonded supramolecular network, MnII complex bridged by squarate molecules was synthesized, and their structural and magnetic properties were studied. X-ray structure determination revealed that MnII complex, [MnII4(C4O4)4(C4H4N2)(H2O)8],…
Infrared-absorption spectroscopy and electron spin resonance are used to study the role of boron impurity in the activation of free charge carriers in layers of porous silicon that have been exposed to nitrogen dioxide acceptor molecules. It is found that the higher the level of doping is for the substrates used in th…
The nonpathogenic strain Arthrobacter nicotianae produces two sialidase isoenzymes, NA1 and NA2, with molecular masses of 65 kDa and 54 kDa, respectively, as determined by 10% SDS-polyacrylamide gel electrophoresis. NA1 and NA2 exhibit maximum activities at pH 4 and 5, and both show clear thermal optima at 40 degrees…
We synthesized europium-activated yttrium phosphovanadate (Y(P,V)O 4 :Eu 3+ ) red phosphor, which is expected to be applicable in plasma display panels, by spray pyrolysis. The effect of pyrolysis temperature on luminescence characteristics was clarified and the mechanism of this effect is discussed. A precursor solut…
In situ studies of ethylene oxidation on Pt(111) have been performed using a powerful combination of fluorescence yield soft X-ray methods for temperatures up to 600 K and oxygen pressures up to 0.01 Torr. Absolute carbon coverages have been determined both in steady-state and dynamic catalytic conditions on the Pt(11…
The most probable orientational distribution functions of rod-like polar molecules contained in a noncentrosymmetric uniaxial system are established using the first-rank and third-rank Legendre polynomials, (P1(cos theta)) and (P3(cos theta)) order parameters, and the maximum entropy method. Emphasis is put on the dif…
Graphite nanostructures fabricated by a simple plasma etching onto a graphite substrate provide an intense emission source of electrons. This cathode does not have the adherence problem commonly seen in carbon deposited emission layera such as carbon nanotubes and graphite nanofibers, thus making it promising for appl…
In this study the CO 2 sorption at 45 °C in PMMA nanocomposite films containing 2 wt.% of nanoclay has been measured using an in-situ gravimetric technique. The films examined were prepared by compression moulding material obtained by dry-blend and solvent co-precipitation techniques. The CO 2 diffusion coefficients w…
A previously developed theory for the temperature-dependent resonance Raman scattering is used to study the surface-enhanced Raman scattering. Two models, the displaced oscillator model and the displaced-distorted oscillator model, based on the harmonic potential energy surfaces are carried out to calculate the surfac…
Abstract A monocrystal ofFe 3 O 4 is characterized by resistance, magnetoresistance and magnetic measurements in a temperature range from 4.2 K to 350 K and magnetic field-cycling from −9 T to 9 T. The resistance measurements revealed a metal-insulator Verwey transition (VT) atT v=123.76 K with activation energy E=92.…
Mehlich 3, Mehlich 2, CAL (calcium lactate), Schachtschabel, 0.01 M CaCl2, and aqua regia were compared as soil potassium extractants. Comparison was focused on the relationships between Mehlich 3 as a Czech official soil‐testing method and the extractants used for this purpose in the past (Mehlich 2, Schachtschabel)…
Research Article| March 01, 2005 Diamonds George E. Harlow; George E. Harlow American Museum of Natural History, New York, NY 10024-5192, USA E-mail: gharlow@amnh.org Search for other works by this author on: GSW Google Scholar Rondi M. Davies Rondi M. Davies American Museum of Natural History, New York, NY 10024-5192…
A two-dimensional model is developed for the modulated internal airflow, due to walking, in the gap between clothing and skin surface in the presence of clothing apertures. The normal airflow renewing the air layer through the fabric is modeled using the Ghali et al. three-node fabric ventilation model with corrected…
A SQUID magnetometer is used to study the behavior of the magnetization of TmFeO3 single crystals along the a and c principal crystallographic axes in the Γ4–Γ24–Γ2 spin reorientation range. The temperature dependences are obtained as the moduli of the magnetization vector M and its turn angle θ in the reorientation r…
This paper presents a novel constrained foaming process to produce microcellular panels. A systematic study of various process variables is conducted using a two-stage, sliding-level design of experiment approach. The resulting microcellular sheets have thicknesses in the 5 – 15 mm range and densities reductions as lo…
: Wood polymer composites based on untreated and maleic anhydride treated banana, hemp, and sisal fibers with HDPE resin are prepared in different ratios of 55:45, 50:50, 45:55, and 40:60 (wt/wt), respectively. Young's modulus and flexural modulus decrease with increase in fiber amount in the polymer. Maleic anhydride…
Abstract When deposits obtained by physical and chemical vapor deposition, electrodeposition, and electroless-deposition are annealed, they undergo recrystallization or abnormal grain growth to reduce their energy stored during deposition. The driving force for recrystallization is mainly due to dislocations, whereas…
Granite powder-reinforced epoxy composites have been developed with varying granite powder content by weight percentage. The variation of tensile strength and impact strength has been studied and the tensile strength and impact strength were found to be at a maximum for the 50% granite powder-reinforced epoxy composit…
X-ray and UV photoelectron spectroscopy (XPS and UPS were used for studying the oxidation of Er films deposited on Ta substrate under ultra-high vacuum.Oxidation has been carried out at room temperatue with an oxygen pressure of 2x10-5 mbar.Erbium exposition to oxygen produces ; Er2O3 and a hydoxide.Subjecting the sam…