Materials Literature
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The adoption of a field-theoretical approach to problems arising in the framework of electrical insulation is discussed with reference to six main topics, which have been addressed over the last 30 years. These include uniform field electrodes, Green's differential equation, electrode surface roughness, induced charge…
Cyclic deformation has been performed at ambient temperature on ultrafine-grained copper processed by equal channel angular pressing. Observations by electron channelling contrast in a scanning electron microscope revealed that pronounced recrystallization occurred and several distinct dislocation configurations such…
Redox disproportionation of benzyl alcohol to benzaldehyde and toluene catalysed by the Pd561phen60(OAc)180 (phen=1,10-phenanthroline) giant cluster 1 under anaerobic conditions was found, whereas in an O2 atmosphere cluster 1 catalyses the oxidation of benzyl alcohol to benzaldehyde and inhibits further oxidation of…
In the present study, we proposed a simple method to locate defect sites in individual SWNTs with an AFM technique by using a thermal oxidation strategy. After thermal oxidation of well-dispersed SWNTs on a silicon surface in air at 500 °C, almost all of the original SWNTs were fractured into short fragments. The rang…
In this work, primary, secondary and tertiary bis(amide) derivatives of DTPA have been synthesized and the residence time of the water molecule coordinated to their gadolinium complexes has been measured by variable temperature 17O NMR spectroscopy. The influence of substituent characteristics (molecular mass, hydroph…
The thermal behavior of 4 coal samples was investigated using simultaneous thermogravimetry (TG/DTG) and differential thermal analysis (DTA) methods. Upon heating the coals in an inert atmosphere up to 800 ° C, 31.44-43.82% weight loss occurs. The 2 temperature regions of increased chemical reactivity are evident in t…
A methodology to develop subcircuit models of magnetic cores with hysteresis using analog behavioral modeling (ABM) in PSpice is presented. A subcircuit equivalent to the Jiles-Atherton model is developed to model the static ferromagnetic hysteresis. The Hammerstein configuration, which includes a nonlinear static blo…
The crystal structures of three tourmaline crystals: (Na 0.49 K 0.01 Ca 0.48 ) (Mg 1.35 Fe 2+ 0.94 Fe 3+ 0.49 Ti 0.20 ) (Al 4.58 Fe 3+ 0.62 Mg 0.80 ) (Si 5.99 Al 0.01 ) O 18 (BO 3 ) 3.03 (OH) 3.18 F 0.18 O 0.64 , a = 16.017(2), c = 7.256(2) Å, V = 1612.2(4) Å 3 , R3m, Z = 3; (Na 0.64 K 0.01 Ca 0.03 ) (Mn 0.18 Fe 2+ 1.…
Surface-enhanced infrared absorption (SEIRA) has been observed by transmission spectroscopy on a vapor-deposited platinum substrate. Monolayers of p-nitrothiophenol ( p-NTP) adsorbed on thin island films of platinum were used to probe the enhancement and distortion of the absorption bands of p-NTP. The greatest enhanc…
The scattering of waves by multilayered periodic structures is formulated in three-dimensional space by using Fourier expansions for both the basic lattice and its associated reciprocal lattice. The fields in each layer are then expressed in terms of characteristic modes, and the complete solution is found rigorously…
In this paper, the results of tests on a 275 and a 400 kV capacitor voltage transformer are presented. The objective has been to determine the transfer function of the CVTs in the Scottish Power extra-high-voltage (EHV) system, which in turn can be used to compensate for the errors at harmonic frequencies. As a primar…
Single-walled carbon nanotubes (SWNTs), upon exposure to the flash from a regular 35 mm camera, were found to ignite and produce small amounts of a bright orange solid. X-ray powder diffraction analysis revealed this solid to be composed mostly of Fe 2 O 3, along with trace amounts of Fe 3 O 4, originating from the Fe…
The synthetic route for the benzoporphyrin derivatives produces two regioisomers in equimolar quantities (ring A and B isomers). A derivative of the A-ring product, BPD-MA (benzoporphyrin-derivative monoacid ring A, verteporfin), has recently been approved in North America and Europe for the treatment of age-related m…
In this article an experimental method of characterization and modeling of ferroelectric materials is presented. The reversible and irreversible contributions of polarization are separated. The measurements of these effects are performed simultaneously giving a perfect separation. Investigations on switching behavior…
The potential of freeze-dried fibrin glue (FG) in combination with growth factor (GF) and gelatin (GEL) is evaluated for use as a matrix for endothelialization of artificial vascular grafts made of polytetrafluoroethylene (PTFE, Teflon) and polyethyleneterephthalate (Dacron). Improved adhesion and proliferation of hum…
Abstract The use of sulfur compounds and particularly sulfamates for flame‐retarding cellulose and other polymers is reviewed. Recent results on flame‐retarding polyamides in this laboratory are presented. The system developed requires the use of 1.5–2.5 wt% of ammonium sulfamate (AS) or diammonium imidobisulfonate (D…
Abstract The effects of the incorporation of different kinds of fibers on the physical and mechanical properties of thermoplastics elastomers based on blends of isotactic polypropylene (iPP) and ethylene‐propylene diene rubber (EPDM) are described. For this purpose, three different compositions of PP‐EPDM blends reinf…
Accurate calculation of the value of the core hot-spot temperature at the design stage is becoming very critical in order to ensure that hydrogen generation that can be caused by oil-film degradation at core hot-spot temperatures as low as 110-120/spl deg/C is limited. Presented are two calculation methods developed f…
Abstract Physical mechanisms for foam formation in the presence of colloidal particles are poorly understood. This study is aimed at enhancing the basic understanding of the mechanisms that produce foaming in a three‐phase system, containing solid, liquid, and gas, and identifying key parameters that aggravate foaming…
Abstract In order to provide a continuous preparation method of CdSe nanocrystals, a microreactor was utilized. Particle size of a CdSe was controlled easily by a second order controlling of reaction time. The fluorescence color was also possible to be controlled by the reaction time.