Materials Literature
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A critical study of the performance of several digital filters for rejecting discrete spectral interference (DSI) in partial-discharge (PD) testing is reported. The filters are evaluated with particular reference to distortion introduced on successive PD pulses. A digital filtering method based on a cascaded second-or…
With the development of fast, and low-cost analog-digital converters (ADCs) and new mathematical procedures for waveform description, e.g., time encoded signal processing and recognition (TESPAR), novel approaches to detect and locate internal defects in the insulation of power transformers become feasible if the foll…
A simple method for simulating magnetizing inrush currents in power transformers using real-time measurements is proposed. The method is based on a simplified model for representing the inrush current under different loading conditions. A digital simulation method using a PC-AT microcomputer is also proposed. Transfor…
The Cahn-Hilliard equation is a fourth-order parabolic partial differential equation that is one of the leading models for the study of phase separation in isothermal, isotropic, binary mixtures, such as molten alloys. When a spatially homogeneous alloy is rapidly quenched in a physical experiment, a fine-grained deco…
Objective measurements of fabric mechanical properties have great potential for quality control of clothing materials. However, access to the requisite instruments still remains a problem for many potential users due to their high cost. Therefore, a scheme for measuring all the relevant property parameters on an Instr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal studies of the zero-field splitting and magnetic exchange interactions in the magnetic susceptibility calibrant mercury cobalt-thiocyanate (HgCo(NCS)4)David Nelson and Leonard W. Ter HaarCite this: Inorg. Chem. 1993, 32, 2, 182–188Publication Date (Print):Janu…
For droplets of hydrocarbon oil dispersed in surfactant solution to be effective in reducing foam stability it is necessary for the droplets to be capble of entering the air/solution interfaces of the lamellae within the foam. If entry is possible, then soap film rupture (hence foam destruction) can, in principle, occ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoisomerization and thermal isomerization behavior of azobenzene derivatives in liquid-crystalline polymer matrixesTakeo Sasaki, Tomiki Ikeda, and Kunihiro IchimuraCite this: Macromolecules 1993, 26, 1, 151–154Publication Date (Print):January 1, 1993Publication History Pu…
Rapid-solidification experiments on metallic alloys in the last decade have provided widespread observations of a novel ``banded structure.'' We report the results of numerical and analytical studies of the interface dynamics underlying the formation of this structure in a model of directional solidification which inc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of toluene hydrogenation on a supported nickel catalystLars Peter Lindfors and Tapio SalmiCite this: Ind. Eng. Chem. Res. 1993, 32, 1, 34–42Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published inissue 1 January 1993https://…
Bright colors have been observed when a metal island film is deposited on top of a silver mirror with a separating quartz layer. For spacer layer thicknesses that are varied from 0 to 140 nm, the visual appearance changes from blue/black to a series of brilliant spectrumlike colors. The sequence is repeated similarly…
The origin, biological function, biochemical properties and cosmetic significance of the silk protein, sericin, are reviewed
Abstract Kaolin is an important industrial mineral and geological indicator. It occurs in hydrothermal, residual and sedimentary deposits. The first two are classed as primary occurrences and the third as secondary. The physical and chemical conditions under which kaolins form are at relatively low temperatures and pr…
The synthesis of 18 new macrocyclic complexing agents incorporating phosphinic acid (and carboxylic acid) groups is reported, based on the 1,4,7,10-tetraazacyclododecane ring. Through selective functionalisation of one ring nitrogen or by changing the nature of the P-substituent, anionic, neutral and cationic complexe…
Three new homologous series of mesogens containing three rings in the main structure and a lateral aromatic branch have been synthesized. When the lateral aromatic branch is attached to the middle ring, monotropic phases are observed, and there is a strong tendency to form the smectic C phase. When the lateral aromati…
The use of lattice energy minimization techniques to generate the structures of titanium dioxide polymorphs is demonstrated, given cell dimensions and contents without symmetry or geometry assumptions. The method yields the structures of rutile, anatase and brookite and, additionally, the TiO2(II) structure. Combined…
Solid solutions of the formula, A2–xLa2Ti3–xNbxO10(A = K, Rb), exist for the range 0⩽x⩽1.0, bridging n= 3 members of the Ruddlesden–Popper series (A2La2Ti3O10) and the Dion–Jacobson series (ALa2Ti2NbO10). For 0⩽x⩽0.75, the phases possess body-centred structures characteristic of the Ruddlesden–Popper phases, while the…
An adequate mathematical model of a three-phase power transformer is one of the important elements in the programs for the computer analysis of power system transients. Featured in this paper is the simulation model of a three-phase, three-limb core-type power transformer. Nonlinear effects of saturation, hysteresis a…
The EM plane-wave shielding properties of anisotropic laminated composites are analyzed, based on a model that treats each lamina as a homogeneous and anisotropic sheet and then uses a method that cascades the wave-transmission matrices in the computation, Numerical results are presented for graphite/epoxy laminates.…
A major light-harvesting complex (LHC) has been obtained from thylakoids of Amphidinium carterae solubilized with digitonin or decylmaltoside and separated by sucrose-gradient centrifugation. The digitonin-LHC forms a dark brown band at approximately 17% sucrose and the decylmaltoside LHC one at approximately 7% sucro…