Materials Literature
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A time-dependent gas-phase isovolumetric desorption technique has been used to evaluate the diffusive transport parameters of hydrogen isotopes in polycrystalline tungsten in the temperatures range 673 to 1073 K and driving pressures from 1.3 104 to 105 Pa. Experiments have been run with both protium and deuterium obt…
The polymorphism and anisotropy of electrical, dielectric, and thermophysical properties of “pure” and doped LiIO3 single crystals are studied. The hexagonal a-LiIO3 phase is a 1-D ionic conductor (along the c axis). The anisotropy of the ionic conductivity of the a-phase can be reduced by doping with transitive metal…
Abstract Nonlinear growth behavior was observed in two crystallization regimes, depending on the temperature. Non-linearity may be explained by the reduction of the concentration of crystallizable ethylene sequences (CES) in the melt phase. In the two regimes, the concentration of uncrystallizable ethylene sequences (…
The inhibitive action of 3-amino-1,2,4-triazole (ATA) on 70Cu-30Zn alloy corrosion in HNO 3 0,5M was examined. Gravimetric and electrochemical tests were used. The results obtained show that the ATA reduces effectively the dissolution of 70Cu-30Zn alloy. The inhibition efficiency in aerated acid increased with increas…
Many properties of lyocell fibers are markedly different from those of other cellulosic fibers. Hence, it is necessary to study Lyocell wet processing to determine and characterize variables that have a significant influence on the properties of finished products. At the Christian-Doppler Laboratory, we are conducting…
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…