Materials Literature
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The star μ Orionis is a spectroscopic visual quadruple system in which each visual component is a short-period spectroscopic binary. The visual orbit has a period of 18.644 yr, a high eccentricity of 0.7426, and a high inclination of 96 2. The visual primary consists of an Am star and probably a G or early K dwarf tha…
Recently, no-load losses P and noise n of transformer cores have been reduced by replacing the former single-step-lap (SSL) joints by multistep-lap (MSL) joints. On the other hand, the application of MSL in model cores was found not only to decrease P and n, but in some cases they increase. The aim of this paper is th…
Abstract The natural aging of rigid poly(vinyl chloride) (PVC) used in building and construction areas has been studied. Bars of PVC exposed in Algiers, where the concentrations of atmospheric pollutants (NO x , O 3 , hydrocarbons) are known, show a small drop in strain at break and stress at break, whereas hardness r…
The present paper reports a comparative analysis of sigma 3 (in the coincidence site lattice notation) grain boundary types, in two grain boundary engineered brass specimens, by use of electron backscatter diffraction (EBSD) data coupled to the measurement of boundary traces in a single section. Although most of the d…
Czochralski grown (Sr 0.50 Ba 0.50 )Nb 2 O 6 single crystals have been studied by the method of precision X-ray diffraction analysis. The structural characteristics of (Sr x Ba 1 − x )Nb 2 O 6 compounds with x = 0.33, 0.50, 0.61, and 0.75 were analyzed. The distributions of the Sr and Ba atoms over the crystallographi…
ZnGa 2 Te 4 was found to crystallize in a defect tetrahedral structure with possible space group I 4 (82) with Z =2. Complete X-ray powder diffraction data were obtained and the unit cell parameters a and c and X-ray density were calculated. These were a =0.5930(1) nm, c =1.1859(3) nm, and D x =5.7×10 3 kg/m 3 .
In order to develop a reactor design model for the secondary reformer in the industrial ammonia plant, the effectiveness factor and convection heat transfer coefficient between gas and catalyst surface have been studied. The temperature and composition of inlet gas to the catalyst bed are predicted using the kinetic e…
An experimental procedure intended for crevice corrosion studies on Ni–Cr–Mo alloys is demonstrated. In this procedure a potentiostatic control of crevice corrosion specimens is applied to an immersible crevice cell design that uses a fluoroelastomer gasket crevice former. The procedure is demonstrated for a crevice s…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPd/C-Catalyzed Release of Organonitrogen Compounds from Bituminous CoalsXian-Yong Wei, Zhong-Hai Ni, Yu-Chun Xiong, Zhi-Min Zong, Xiao-Hua Wang, Cheng-Wei Cai, Ya-Fei Ji, and Ke-Chang XieView Author Information School of Chemical Engineering, China University of Mining…
Abstract The interlayer structures in one- and two-layer hydrates of Na-vermiculite are described by presenting the positional parameters of their constituent atoms, including protons. The revision of these structures has been accomplished by: (1) determining accurate water contents of the two hydrates by thermoanalys…
The aim of this paper is to study the interactions between packaging and food. For that purpose, additives were first characterized. Kinetic studies of their specific migrations have been carried out by using different analytical methods such as gas chromatography, Fourier transform infrared spectroscopy, atomic absor…
Rubber ferrite composites have the unique advantage of mouldability, which is not easily obtainable using ceramic magnetic materials. The incorporation of mixed ferrites in appropriate weight ratios into the rubber matrix not only modifies the dielectric properties of the composite but also imparts magnetic properties…
A year-long research on the Mugil cephalus and M. curema diet was conducted. The food content in the cardiac portion of 192 stomachs revealed a great similarity in both species leading to two conclusions: sediments are their basic food and high levels of benthic diatoms are dominant. A total of 130 taxa were found (Ni…
Optical absorption, fluorescence, excitation and time-resolved spectra, and fluorescence dynamics were studied in Eu2+- and Eu3+-codoped aluminosilicate glasses. The results indicated that the energy transfer occurred between Eu2+ and Eu3+ ions, in which the energy corresponding to the 4f65d to S87/2 transition of Eu2…
The application of high resolution electron backscatter diffraction (EBSD) in a field emission gun scanning electron microscope to the characterization of a deformed aluminium alloy is discussed and the results are compared with those obtained by transmission electron microscopy. It is shown that the adequate spatial…
Using photoelectron spectroscopy, the electronic structures of the CMR (colossal magneto-resistance) manganites of Pr1-xSrxMnO3 (PSMO; x = 1/3, 1/2, 2/3), La0.7Ca0.3Mn0.95T0.05O3 (LCMTO; T = Fe, Co. Ni). and La0.7Ce0.3MnO3 (LCeMO) have been-investigated. Mn 2p spectra of PSMO and LCMTO are found to be very similar for…
Edited by D M Brunette, P Tengvall, M Textor and P Thomsen, Springer Verlag: 2001. Cost £147.00 (ISBN 3-540-66936-1) My first response just looking at the flyer for this book was that it was expensive. However, I began to realise the reason for this cost when I picked the book up: it is large, heavy (1.58kg) and extre…
Structural phase transitions in Ca2SiO4 and Sr2SiO4 are investigated by molecular dynamics simulations. The simulations are based on the potentials calculated from the Gordon–Kim modified electron gas formalism extended to molecular ions. We successfully reproduced the transition γ−αH′−α and β−αL′−αH′−α in Ca2SiO4, an…
The stability towards acidolysis of intermediates used in the preparation of core-modified porphyrinic macrocycles was examined. Experiments were performed using analogs of 5-phenyldipyrromethane in which one of the two pyrrole rings was modified (XPM). The XPMs utilized in these studies had X = 2-furyl (OPM), 2-thien…
Low-amplitude constant plastic cyclic deformation of copper single crystals oriented for single slip [123] was carried out at room temperature in air. The plastic shear strain amplitude was 1 × 10−3. The observation of dislocation structure evolution in the early stages of fatigue and the investigation of the formatio…