Materials Literature
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A novel electron beam (EB) spot size measurement method is proposed. In this method, EB spot size is obtained from the relationship between the width of the trenches in the reference sample and the intensity profile of backscattered electrons. Selective chemical etching of a GaAlAs/GaAs superlattice produces an ideal…
The authors provide a detailed loss computation of a sheet wound transformer. The aim is to develop a simplified two-dimensional model in which 3-D effects due are introduced by correction factors. The present solution is based on analytical computation of extra losses in bus bars, numerical determination of bus bar s…
The potential use of POWERCORE strip for the fabrication of low-loss stacked cores was investigated. Two three-phase transformer cores having different joint configurations were assembled and tested (core A: 90 degrees butt and lap T and corner joints; core B: 45-90 degrees T-joints and 45 degrees mitred corner joints…
Rhomboedrisch verzerrt aufgrund der Form der organischen Ionen ist die Antiperowskitstruktur aller vier ternären Salze 1 , die durch Elektrokristallisation der Komponenten Tetrathiafulvalen (TTF), Tetrabutylammoniumhalogenohexamolybdat und Tetrabutylammoniumhalogenid erhalten wurden. Die verbleibende dreizählige Symme…
Abstract The dielectric spectrum is measured up to 72 GHz of solutions of polyvinylpyrrolidone (PVP) in tetramethylurea (TMU), dimethylethylene urea and dimethylpropylene urea. Concentrations are up to a monomole fraction of 0.65 (PVP 1200) or 0.5 (PVP 40 000). Measuring temperatures are 20CC for all systems and addit…
Ions in the mass range from H to Xe have been used at energies from a few keV to more than a GeV to cause atomic rearrangement and consequent formation of conducting grains of carbonized material in several polymers. Generally, the conductivity increases dramatically-- by several orders of magnitude--until finally dem…
Synthesis and characterization of thermally stable polycyanurate is being reported here. The polycyanurate is a copolymer obtained by interfacial polycondensation of bisphenol-A, bisphenol-F and 2-methoxy-4, 6-dichloro-s-triazine. The copolymer obtained is characterized by various means. Spectroscopic characterization…
$^{15}\mathrm{N}$ nuclear-magnetic-resonance (NMR) measurements are reported on solid $^{15}\mathrm{NNO}$. Because of the anisotropic chemical shift and intramolecular dipole coupling, molecular reorientation results in a change in the nuclear-precession frequency. The rate of combined-translation-rotation jumps in th…
When undoped Yttrium Stabilized Zirconia is exposed either to reducing atmospheres or to electrical currents it becomes coloured. In this paper we present the results of a systematic study applying optical and EPR techniques to zirconia single crystals stabilized by calcium or yttrium, in which defects were produced b…
Two peaks at 355 and 525K appear in the thermoluminescence spectrum of polycrystalline spinel X-irradiated at room temperature. They are due to thermally released electrons which recombine at several impurity centres as well as at V-centres. The influence of defects arising from the structural disorder and the non-sto…
We present results from both, calorimetric and dilatometric studies of the isothermal ordering process taking place in a Cu-Zn-A1 shape memory alloy after quenches from T, temperatures ranging from 350 K to 1200 K. The dissipated energy and the length variations of the system are obtained during the process. The chang…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of poly(ethylene oxide) crystallization from solution: concentration dependenceNi Ding and Eric J. AmisCite this: Macromolecules 1991, 24, 24, 6464–6469Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 Novembe…
Lithium phosphate glasses with different iron oxide contents were prepared using a rapid quenching technique and their glass transition temperatures (Tg), densities (d) and refractive indexes (n) were measured.X-ray photoelectron spectroscopy(XPS), infrared spectroscopy(IR) and Mossbauer spectroscopy have been used to…
ABSTRACT Our previous report on separating low fat flesh from fatty fish by cryo‐shattering indicated that at appropriate temperatures, fat content in particles increased with particle size. The effect was temperature dependent; that effect of low temperature on fracture stress and elastic modulus of model fish flesh…
An experimental study has been conducted to estimate volumetric heat transfer coefficients between product volatiles and the .solid matrix within the tortuous pore network of decomposing glass-filled polymer composites. Two such composite materials, denoted as Haveg H41N and Fiberite MXBE-350, have been studied in thi…
Abstract This paper reports an investigation of the influence of fabric softener on fiber transfer, using a relatively new fiber transfer abrasion tester. Nine medium-weight apparel fabrics were evaluated with and without fabric softener. Fiber transfer from these fabrics was evaluated in terms of the total number of…
A new method for the examination of molds that involves the use of a device that dispenses a thin layer of a transparent adhesive material over the surface of a coverslip is described. The advantages of this method over previous methods used for the microscopic examination of molds are delineated.
In this paper, the acid-base interaction is shown to consist of at least two major components: the electrostatic (or ionic) and charge transfer (or covalent). To complement existing acid-base theories, we further demonstrate the relevance of the density-functional theory to surface interactions and solid adhesion. On…
Direct writing of metal features narrower than 100 nm is accomplished by scanning a focused ion beam over a substrate covered with a thin solid metalorganic film. A metalorganic cluster coordination compound [Ir4(CO)11Br][N(C2H5)4] is spun on an oxidized silicon wafer from acetone solution and the resulting layer is i…
The authors present test results on preparing a set of Co-substituted Ni ferrites Ni/sub 1-x/Co/sub x/Fe/sub 2/O/sub 4/ (x=0.04 to 0.25) as a material which absorbs electromagnetic wave energy at the X band. A novel method of determining the dependence of the microwave complex permeability on the frequency is describe…