Materials Literature
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Rubber ceramic composite, negative temperature coefficient of conductivity (NTCC) thermistors, are widely used in industry because of the high dependence of their electrical conductivity on temperature. The effect of iron oxide (Fe3O4) on the vulcanization process, DC conductivity, thermoelectric power, dielectric con…
The notion of a paracrystal is particularly well adapted to the calculation of the scattering interference function of distorted crystallographic lattices in which the long-range order does not exist. However, classical paracrystal modelling cannot be used directly for hexagonal lattices because it does not respect th…
The two title compounds are isostructural with pairs of diselenadiazolyl radicals associating in an unprecedented manner via an orthogonal interaction between singly occupied molecular orbitals which renders them essentially diamagnetic in the solid state.
Melt self-condensation of 1-(2-hydroxyethoxy)-3,5-bis(methoxymethyl)-2,4,6-trimethylbenzene in the presence of an acid catalyst via a transetherification process yielded a soluble high molecular weight hyperbranched polyether, whose structure was established by NMR spectroscopy.
The growth kinetics of surface films of propyltrimethoxysilane (PTMS) deposited on aluminium and iron oxide surfaces exhibit oscillatory adsorption. This phenomenon involves non-linear oscillations in surface coverage of the adsorbate, as measured by x-ray photoelectron spectroscopy (XPS), as a function of exposure ti…
A photobleaching method has been used to observe the reorientation of tetracene and rubrene in polystyrene during physical aging. Rotation times change more than an order of magnitude during isothermal aging after a temperature quench from above Tg. Down- and up-jumps of the temperature show the expected asymmetry due…
We report the formation of a compound, ${\mathrm{Gd}}_{2}{\mathrm{CuGe}}_{3},$ in a ${\mathrm{AlB}}_{2}$-derived crystal structure and its temperature- (T) dependent magnetic susceptibility, heat-capacity, electrical-resistivity $(\ensuremath{\rho}),$ and magnetoresistance behavior. The results suggest that this compo…
This paper presents a wavelet denoising method for partial discharge (PD) signal extraction from the electromagnetic interference (EMI) existing in electrical machines such as high frequency sinusoidal noise, pulse-shaped noise and stochastic noise. The proposed denoising method is performed through multiresolution si…
We report miscibility behavior for synthetic biodegradable aliphatic polyester (BDP) and poly(vinyl acetate) (PVAc) blends by investigating their thermal, rheological, and mechanical properties. Two separate glass transition temperature peaks for the BDP/PVAc blends proved that these blend systems are immiscible. From…
Competitive particle growth (CPG) theory and linear stability analysis are combined to study the potential patterning trends of two-salt Liesegang systems. The pattern formation is treated as a post-nucleation phenomenon. Experimental investigations show that some systems mainly give patterns where the bands of the tw…
The Rietveld method, extended by a Fourier analysis of line profiles on the basis of the Warren–Averbach method, has been used for analysing the powder X-ray diffraction (PXRD) pattern of a [Zn–Al–Cl] layered double hydroxide, in order to separate size and strain effects. Assuming a given size distribution (Cauchy) an…
The incorporation of poly(1,4-butylene adipate) (PBA) and its crystallization behavior within poly(vinylidenefluoride) (PVF2) spherulites in miscible PVF2/PBA blends have been further studied with small-angle X-ray synchrotron scattering (SAXS). The incorporation of PBA into the PVF2 interlamellar region was found to…
The surface modification of poly(ethylene terephthalate) (PET) and UV-cured tripropyleneglycol diacrylate (acrylic) films induced by remote N2 and Ar microwave plasmas (2.45 GHz) was compared by in-situ XPS measurements. Both N2 and Ar plasma treatments led to destruction of the initial oxygen-containing groups. The d…
The crystalline structure and physico-mechanical properties of polypropylene (PP) blended with ethylene–propylene copolymer (EPM) were investigated. WAXS diffractograms showed that the addition of EPM did not affect the crystalline structure of PP. DSC curves revealed the presence of two Tg peaks indicating the amorph…
The Nagel-scaling and the modified scaling procedure proposed recently by Dendzik et al. have been applied to broadband dielectric data on two glass- forming liquids (glycerol and propylene carbonate) and three plastic crystals (ortho-carborane, meta-carborane, and 1-cyano-adamantane). Our data extend the upper limit…
CURRENT SCIENCE, VOL. 79, NO. 7, 10 OCTOBER 2000 1007 6. Seeber, L. and Gornitz, V., Tectonophysics , 1983, 92 , 335 –367 . 7. Jackson, M. and Bilham R., J. Geophys. Res. 1994, 99 , 13897–13912. 8. Bilham, et al., Nature , 1998, 386 , 61 –64. 9. Chugh, R. S., in International Symposium on Recent Crustal Movements, 197…
The crosslinking processes of aqueous poly(vinyl alcohol) (PVA) by γ-ray irradiation were studied by viscometry, dynamic and static light scattering (DLS and SLS), as well as size exclusion chromatography (SEC). Increases in the intrinsic viscosity ([η]), molecular weight (Mw), hydrodynamic radius (Rh), and radius of…
Bisdipyrrin 1 reacts with Ru3(CO)12 to yield the pentanuclear cluster 2; the X-ray structure of 2 sheds new light on the metalation processes of oligopyrrolic ligands.
We have previously shown with X‐ray photoelectron spectroscopy that acetone remaining on the surface of a copper strip after degreasing, can react slowly with water vapor under ambient light to form acetic acid and cause severe corrosion. The reaction was completely inhibited in darkness. This suggested that copper re…
Field studies have been performed in residential areas to determine the load restoration process after a disturbance. Similar measurements were also performed for individual houses with different heating supplies. Load aggregation for the different houses during the same outdoor conditions have been made for various d…