Materials Literature
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SYNOPSIS The combination of finite time thermodynamics and non-equilibrium thermodynamics is applied to analyse and optimise the performance of a thermoelectric generator, which is composed of multi-elements. For the fixed total heat transfer surface area of two heat exchangers, the ratio of heat transfer surface area…
During irradiation in a LWR, helium is produced in nuclear oxide fuels, particularly in MOX fuels, but also to a lesser extent in UO{sub 2} fuels. In a context of increasing discharge burnup for the fuel rods and use of higher linear heating rates, the impact of He on the behavior of the fuel rod is required. A three-…
Abstract © 2007 Wiley Periodicals, Inc. Heteroatom Chem 18:557–567, 2007; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/hc.20334
In the present paper the problem of the reproduction of volt-time characteristics of MV insulators under standard and a short tail lightning impulses is considered. For this purpose models based on the disruptive effect, as proposed by Kind and modified by Chowdhuri, are applied. Aim of the paper is the optimal select…
The design and performance test of a cholesteric liquid crystal depolarizer (CLCD) is presented. This new depolarizer is a wedge-shaped cell filled with cholesteric liquid crystal material. By placing a CLCD in its path, the incident light beam is divided into a great number of micro beams in space, and each micro lig…
Railway wheel failure occurs when metal spalls from the tread to produce flat or out-of-round wheels that cause high dynamic forces. Spalls initiate in brittle martensite formed by the frictional heat produced during wheel slide. The current paper calculates the temperatures developed in the sliding wheel and discusse…
The influence of gamma irradiation on low-density polyethylene (LDPE) has been studied through space charge measurement and dielectric spectroscopy. Commercial LDPE film with a thickness of 100μm was irradiated with γ-rays at a dose rate of approximately 10kGy/h to different doses up to 100kGy in an atmosphere of air,…
This article presents a comprehensive bibliographic survey pertaining to multistress and field aging of polymeric insulators.
Epitaxial magnetite (Fe3O4) thin films were deposited on (001) SrTiO3 substrates by molecular beam epitaxy using molecular oxygen and characterized by transmission electron microscopy and magneto-optic Kerr effect measurements. The films are epitaxial with (001)f‖(001)s and [110]f‖[110]s and the film∕substrate interfa…
We investigate the stresses in thin films with sub-millimeter lateral spatial resolution using a dense array of prefabricated cantilever beams prepared by microelectromechanical-system techniques. Stress induced deflection of the cantilever is interrogated by an optical (laser/position sensitive detector) measurement…
A conducting polymer polythiophene (PT) film incorporated with copper phthalocyanine (CuPc), which was a highly functional molecule, was synthesized and characterized by Fourier transform infrared (FTIR) spectroscopy and x-ray photoemission spectroscopy (XPS). Electrochemical and casting processes were developed as a…
Temperature-dependent photoluminescence excitation (PLE) spectroscopy is used to study nominally undoped and indium-doped ZnO nanorods grown by thermal evaporation method. Clear differences in PLE features between the two samples are observed. We demonstrate that the first derivative of the PLE spectra can be used to…
The aim of the current paper is to develop analytical theories for industry to predict the relations between the punch stroke, flaring ratio, tube thickness, and flaring forming limit in the tube flaring process. The volume incompressible condition, Levy-Mises equation, and explicit die profile description are combine…
Nano-SiOx and micro-SiO2 particles were homogeneously dispersed in low-density polyethylene with double-solution method. The dc breakdown strength of the composite containing various contents of nano-SiOx was experimentally investigated, as well as the composite containing micro-SiO2. The breakdown strength of the nan…
The five metalloporphyrins ( T (p- Cl ) PPM , M = Fe , Mn , Co , Cu , Zn ) with different metal nuclei were synthesized, and their catalytic aerobic liquid-phase oxidations of p-xylene into p-toluic acid, p-toluic aldehyde and terephthalic acid using a low concentration of acetic acid as solvent without any halide add…
Abstract In thin film magnetic recording media, the carbon protective layer and the outermost lubricant layer have a significant influence on the tribological properties. It is thought that the functional groups on the surface of the carbon influence the adsorption of the lubricant. The present study describes the ide…
The corrosion products formed on carbon steel exposed to the Qinghai Salt Lake atmosphere for 12 months was studied using scanning electron microscopy (SEM), electron probe micro-analysis (EPMA), x-ray diffraction (XRD), infrared transmission spectroscopy (IRS), and electrochemical techniques. The rust was mainly comp…
Destructive methods were used for the burnup determination of a PWR nuclear fuel irradiated to a high burnup in power reactors, and of a dry processed fuel fabricated from a spent PWR fuel and irradiated in the Hanaro research reactor. The total burnup was determined from a measurement of the Nd and Cs isotope burnup…
The ZnO films in which the crystallite c -axis is unidirectionally aligned in the substrate plane [(11 0) textured ZnO films] enable the realization of shear mode devices in the ultra high frequency (UHF) range. In this study, we have investigated the (11 0) textured ZnO film, focusing on the effect of total gas press…
In this study, a Rosen-type Pb(Mg(1/3)Nb(2/3))O(3)-PbTiO(3) single crystal piezoelectric transformer is presented. First, we simulate the operation of this transformer using the finite element method and ANSYS. By adjusting the dimensions of the piezoelectric transformer, a maximum voltage step-up ratio of 138 can be…