Materials Literature
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The possibility of using the iodide method and the method of bleaching of 4-nitroso-N, N'-dimethylaniline, developed originally for homogeneous aqueous medium for the determination of singlet oxygen production, was tested for water-insoluble nonpolar senzitizers adsorbed on the silica gel support. Sensitizers of the p…
This paper briefly describes the signal processing to determine the space charge and electric stress distributions using the newly developed pulsed electro-acoustic (PEA) system for use on power cables. Due to the coaxial geometry and the thick walled insulation, factors such as divergence, attenuation and dispersion…
In order to decrease frost on an air conditioner's fins, super water-repellent aluminum is required. Two requirements for the super water-repellent surface are reported, i.e., (1) roughness surface (large surface area) and (2) water-repellent functional group on the surface. Using both electrolytic etching and anodic…
The dynamic rheological behavior of a liquid crystalline polymer (LCP), Vectra™ A, and nylons was investigated. The viscosities of nylon 66 and nylon 6 decrease slowly with an increase in temperature, while the viscosity of Vectra A drops dramatically at 280 °C, but remains slightly changed above 300 °C. At constant f…
This paper deals with the study of PD ageing in a flat cavity at different thermal conditions. Actually, we deem that mastering the aging of insulating materials under their real working conditions is of great importance for a good dimensioning of the insulating parts of power electrical equipment, such as components…
The formation of germanate phases with the mullite structure [Ga6Ge2O13, Al6Ge2O13 and (Ga,Al)6Ge2O13] from oxide mixtures and hybrid sol–gel precursors was studied by thermal analysis, XRD, IR spectroscopy and multinuclear MAS NMR. The course of the thermal reactions in all the Ga-containing oxide mixtures, irrespect…
The effect of conformation (E/Z isomerism), nature (donor/acceptor) of substituents, and endgroups (indandione, pyrazolone, pyrazoledione) on the molecular hyperpolarizability βvec of dicyanomethylene (hetero)aromatic dyes is investigated by means of semiempirical (AM1, ZINDO) molecular orbital calculations. Unless Z…
A neutron diffuse scattering experiment on the relaxor ferroelectric PZN(PbZn1/3Nb2/3O3) has been carried out. The diffuse scatterings show strongly anisotropic distributions around the reciprocal lattice points, whose patterns change drastically depending on the index of the reciprocal lattice point. These experiment…
—An examination was made of the adhesion of nylon-6 resin to treated metals such as phosphor bronze, brass plates, and electronickel platings during injection molding. No adhesion to any of these metals was noted to occur under ordinary injection molding conditions and an aqueous solution of 1,3,5-triazine-2,4,6-trith…
The rigid pendant-arm macrocyclic ligand 1,4,7-tris(2-aminophenyl)-1,4,7-triazacyclononane (L1) has been synthesized. It reacts with divalent first row transition metal perchlorate salts to yield complexes of general formula [MII(L1)][ClO4]2 (M = FeII, NiII, CuII or ZnII). Single crystal X-ray crystallography indicate…
The Raman spectra of cadmium tris(thiourea) sulphate (CTS) single crystals were studied in the wavenumber range from 400 to 650 cm−1 for temperatures between 10 and 300 K. Two phase transitions occurring at 55 ± 2 and 134 ± 2 K were observed and characterized. Based on the evolutions of the spectral parameters (wavenu…
In designing EHV transmission systems, specific knowledge about the creepage distance of the insulator, which is subjected to adverse environmental contamination, is important. Various system components' configurations can be properly coordinated through the appropriate application of the relationship between insulato…
A novel in situ spectroelectrochemical cell has been constructed for the simultaneous measurement of fluorescence and current-voltage characteristics during redox cycling. This involves the use of a detachable rotating disc electrode (RDE), which allows the characterisation of luminescent redox active films produced e…
Ornamentation of the cell wall with special reference to granule density was evaluated as a taxonomic criterion for separating seven infraspecific taxa of Pediastrum boryanum (Turpin) Meneghini (Sphaeropleales, Chlorophyta). Twenty-two isolates from Danish lakes and three isolates from the culture collection in Göttin…
The high-speed melt spinning of sheath/core type bicomponent fibers was performed and the change of fiber structure with increasing take-up velocity was investigated in comparison with the results of our previous study. Two kinds of polyethylene, high density and linear low density (HDPE, LLDPE) with melt flow rates (…
The crystallisation, crystal structures, and crystal packing of [Mn(phen)3]I7 and [Fe(phen)3]I7 are reported. The crystal lattices are isomorphous, but there are informative small differences between the two structures. The [M(phen)3]2+ complexes occur as parallel (P4AE)∞ chains, forming two parallel fourfold aryl emb…
A new sublimation method of material purification in a vacuum based on the crystal-vapor-crystal phase transformation is outlined. A basic design of growth reactor and the main parameters of CdTe fine purification are given. With the use of low-temperature photoluminescence (PL), the purification dynamics are revealed…
We derive the equations of motion for N spherical and massless bubbles in an incompressible and irrotational liquid. The bubbles’ motion is assumed to be at high Reynolds, low Weber number and collisionless. External acoustic driving and viscous dissipation are included. In particular, we focus on the interplay of the…
Exponential polynomials are the building bricks of spectral synthesis. In some cases it happens that exponential polynomials should be extended from subgroups to whole groups. To achieve this aim we prove an extension theorem for exponential polynomials which is based on a classical theorem on the extension of homomor…
All articles of this category A "3 + 1" methodology has been developed for the synthesis of novel porphyrin analogues with carbon rings in place of one or more of the usual pyrrole units. This approach involves the acid catalyzed condensation of a tripyrrolic intermediate (tripyrrane) with dialdehydes, followed by oxi…