Materials Literature
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Among many attractive effects on physicochemical processes; one of the most promising applications of power ultrasound concerns crystallization. This paper is a review of the previous work on sonocrystallization. Ultrasound has been used in crystallization to initiate primary nucleation by narrowing the metastable zon…
One of the parameters used to characterize the partial discharge (PD) behavior is its inception voltage. The partial discharge inception voltage (PDIV) should always be higher than the operating voltage to ensure that PD does not occur at or near operating voltage. Under these circumstances, other PD parameters such a…
Sets of pressurized tubes constructed from a combination of three lots of HT9 and two heat-treatments were examined after irradiation in FFTF-MOTA at four different temperatures between 400 and 600°C. Diametral measurements indicated that small amounts of swelling occurred at 400°C, with the magnitude of the swelling…
Five new glycosides of 14,15-seco- and 13,14:15-diseco-type pregnanes, including a new pregnane, 2 alpha-hydroxyhirundigenin, were isolated, in addition to one known glycoside, cynatratoside B, from the roots of Tylophora tanakae Maxim. Their structures were elucidated by spectral and chemical means.
The basic loss and recovery mechanisms of composite insulator hydrophobicity are described. Two typical silicone systems, room temperature vulcanizing silicone rubber (RTV) and liquid silicone rubber (LSR) used for high voltage sheds are analysed concerning their LMW contents and quality. The hydrophobicity transfer o…
This is the first of a series of research papers featuring structure-property relationships in UK-grown natural cellulosic fibres, a renewable resource which may be extracted from the stems of plant fibres. They are composed of cellulose, hemicellulose, and lignin, together with other constituents, and, unlike seed ha…
The effect of blending tricalcium phosphate (TCP) on hydrolytic degradation of a new type of poly(L-lactic acid)/poly(ethylene:hexamethylene/sebacate) block polyester (60: 40 wt%) was studied. 100- and 250-microm film specimens blended with 0, 10, and 30 wt% TCP were immersed in phosphate buffered saline (pH 7.4) at 3…
Spectra and temperature dependent decay rates of emission from [Mn(15-crown-5)(H2O)2]2+ ions anchored by a network of O–H‥Br‥H–O bonds in two- and one-dimensional supramolecular arrays of {[Mn(15-crown-5)(H2O)2][TlBr5]}n 1 and {[Mn(15-crown-5)(H2O)2]Br2}n 2 demonstrate the potential efficacy of manganese(II) ions as l…
The 13C-{1H}NMR spectra of two monofluorinated nematic liquid crystals, I35 and I52, have been obtained and analysed to yield sets of dipolar couplings, DiF, from each carbon in the molecule to the fluorine nucleus. The couplings involving carbons in the fluorinated biphenyl group are used, together with a mean field…
meso-Functionalised porphyrin-α-diones have been prepared as the basic building blocks for bis-porphyrin arrays. meso-Halophenyl porphyrins 4 and 7 were prepared by condensation of 3,5-di-tert-butylbenzaldehyde with dipyrromethanes 1, 2, and 3. Conversion of 4 and 7 to the corresponding meso-halophenylporphyrin-α-dion…
The Sc 2 (WO 4 ) 3 type structure has been used in order to create new trivalent cation conducting solid electrolytes by forming solid solutions of the type (Sc 2 (WO 4 ) 3 ) 1– x (M 2 (MoO 4 ) 3 ) x (M=Nd, Sm, Gd, Lu). In these compounds, the anionic part of the structure is partly replaced by molybdate (WO 4 →MoO 4…
Aluminium thin films grown with different thickness on silicon substrates were analyzed by atomic force microscopy and grazing incidence x-ray techniques. Stress on surface film was found to be greater as the thickness increases because of the substrate history. Roughness measurements made on the AFM images shown a li…
In this work, the effect of mimosa tannin (MT) on corrosion processes on steel in sulfuric acid solutions of pH 1 to 3 was investigated using potentiodynamic polarization and mass loss methods. The nature of complexes formed by the used commercial MT product with ferric ions was investigated by specrophotometric metho…
Backscattered electron (BSE) imaging is most commonly performed by applying accelerating voltages of 10kV and above to the specimen. For imaging of surface detail, the application of a lower accelerating voltage results in less beam penetration, spread and overall specimen damage. A field emission scanning electron mi…
This paper presents a composite insulation technology for a new compact 72/84 kV C-GIS-cubicle type gas insulated switchgear. The dielectric characteristics of a composite insulation structure composed of low-pressure SF/sub 6/ and epoxy are shown. It is clarified that this structure is effective in increasing withsta…
The formation of real-time holographic gratings was investigated in an azobenzene polymer liquid crystal (PLC) possessing a siloxane spacer in the side chain. Irradiation of thin films of the PLCs created a phase grating which is ascribed to periodic induction of the nematic-to-isotropic (N–I) phase transition due to…
2-Aminothiophene derivatives are the key intermediates for the present synthesis. It is known that the synthesis of 2-aminothiophene is troublesome although it is a rather simple heterocycle. In this work, an early report was newly developed as a basis for the efficient synthesis of thiophene-ring-containing chromopho…
The dielectric and piezoelectric response of ferroelectric thin films and ceramics was investigated as a function of the driving field amplitude. Detailed analysis of the amplitude and phase angle of the third harmonic of the dielectric displacement and piezoelectrically induced charge shows that the usual phenomenolo…
The structural changes occurring during the thermal decomposition of ammonium tetrathiotungstate to form amorphous WS 3 and poorly crystalline WS 2 have been studied in situ using combined extended X-ray absorption fine structure (EXAFS) spectroscopy at the tungsten L III -edge and X-ray diffraction. Data collected du…
29 Si and 13C MAS NMR spectroscopy, DTA–TG and elemental analysis were used to study the evolution of metastable oxycarbide phases starting from thin gel sheets derived from methyltriethoxysilane (MTEOS), tetraethoxysilane (TEOS) and a colloidal silica containing sol, up to 1450 °C under a nitrogen atmosphere. The sto…