Materials Literature
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The spectroscopic properties of Ni(2+)- doped nanocrystalline glass-ceramic fibers are reported. The cerammed fibers show strong fluorescence with peak wavelength at 1250 nm, 3-dB bandwidth at ~250nm, measured lifetimes at >1ms, and low-fluorescence saturation powers (~35mW) for 980-nm diode pumping. Current diode-pum…
Porous ZrO 2 ceramics were fabricated by compacting a fine ZrO 2 powder, followed by pressureless sintering. Two unidirectional pressures of 30 and 75 MPa were used to prepare the green compacts. The strength and the fracture toughness of porous ZrO 2 specimens sintered from the compacts prepared by 75 MPa were substa…
Abstract The aim of this work is to characterize the oxidation behaviour of different nickel‐base alloys exposed to high‐temperature and high‐pressure water for short oxidation times. The behaviour of Alloy 600 (74% Ni, 16% Cr, 9% Fe), Alloy 690 (60% Ni, 30% Cr, 9% Fe) and Alloy 800 (47% Fe, 32% Ni, 21% Cr) exposed to…
We demonstrate that an organic conductor α-(BEDT-TTF) 2 I 3 exhibits various types of transport phenomena when compressed along some crystal axes. When the sample is strained along the a -axis, the low-temperature electronic state changes from a charge-ordered insulating state under small strains to a narrow gap semic…
The use of ionic liquids as novel solvents for the synthesis of condensation polymers was investigated. A series of ionic liquids including new ones was synthesized and purified. 1,3-Dialkylimidazolium-based ionic liquids seem to be suitable reaction and activating media for the synthesis of high-molecular-weight arom…
Dendrimer-encapsulated Pd(0) nanoparticles inside poly(propylene imine) (PPI) dendrimers functionalized with triethoxybenzamide groups have been prepared by extraction of Pd 2+ and subsequent chemical reduction. The resulting dendrimer−Pd nanocomposites are unique catalysts for substrate-specific hydrogenation of pola…
The surface part of the oxygen incorporation reaction into the model material Fe-doped SrTiO3 is investigated by in situ optical spectroscopy. Experiments close to and far from equilibrium (small and large pO2 changes) and the effect of UV irradiation on the reaction rate allow us to draw the following conclusions wit…
The capacitive coupler, acoustic emission (AE) sensor and radio frequency current transducer (RFCT) have been used to detect partial discharge (PD) activity within a 132 kV prefabricated cable joint containing a known defect. Although each of the three methods has been applied individually under different situations,…
Abstract Ultraviolet weathering performance of polyvinyl chloride (PVC) filled with different concentrations of wood flour was studied. Extruded PVC/wood‐flour composite samples were subjected to cyclic ultraviolet lamps/condensation exposures and assessed over a total of 400 and 2600 hours. Each assessment consisted…
A selective heteromeric supramolecular assembly process is devised to create functional single channels of altered ion conductance, charge selectivity, and rectification. The hollow transmembrane tubular structure produced spontaneously from the self-assembly of cyclic-d,l-alpha-peptides in lipid bilayers is modified…
We extend the ideas of the perfect lens recently proposed [J.B. Pendry, Phys. Rev. Lett. 85, 3966 (2000)] to an alternative structure. We show that a slab of a medium with negative refractive index bounded by media of different positive refractive index also amplifies evanescent waves and can act as a near-perfect len…
This paper describes the progress that has been made in the past decade in the investigation of the peculiar dynamic properties of vitreous silica (v-SiO 2 ) and related glasses in the terahertz (THz) frequency range. The reason why we focus our attention on v-SiO 2 is that it is one of the principal network glasses a…
Regulation of expression of the phasin PhaP, which is the major protein at the surface of polyhydroxyalkanoate (PHA) granules in Ralstonia eutropha H16, was studied and analysed at the molecular level. The regulation of PhaP expression is achieved by an autoregulated repressor, which is encoded by phaR in R. eutropha.…
Article The Structural Features of Glass Fibre Reinforced Polyester Matrix Composites was published on August 1, 2002 in the journal Science and Engineering of Composite Materials (volume 10, issue 4).
The rheological behaviour of hydrated maize starch is investigated by means of a Haake internal mixer equipped with a sealed chamber. Results were obtained at temperatures between 89 and 115°C with water content between 25 and 30%. Through a proper calibration torque measurements and rotation speeds are converted to s…