Thermal conductivity of gelcast porous alumina
Larger pores, a compact matrix and smaller fraction of grain boundaries in foams resulted in less effective dissipation of heat transfer and a larger mean free-path for phonons to propagate.
Materials Literature
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Differences in the Tetragonal to Monoclinic Phase Transformation Rate in Hot Water of 3mol% Y2O3-ZrO2 Ceramics under Different Surface Conditions.
Hot-isostatic-pressed (HIP'd) tetragonal zirconia ceramic containing 3mol% Y2O3 was soaked in hot water at 95-100°C to evaluate the transformation rate from the tetragonal (T) to the monoclinic (M) phase. The transformation rate differed considerably between the polished surface and the surface cut by a diamond wheel.…
Effect of skin-pass rolling direction on magnetic properties of semiprocessed nonoriented electrical steel sheets
Effect of skin-pass rolling direction on magnetic properties and directionality in semiprocessed nonoriented electrical steel sheets produced by skin-pass rolling process was studied. Skin-pass rolling direction affects greatly magnetic properties and directionality. By the control of skin-pass rolling direction, the…
Crystallization and preliminary X-ray diffraction studies of phospholipase D fromStreptomyces antibioticus
Phospholipase D (E.C. 3.1.4.4) from Streptomyces antibioticus has been crystallized in six crystal forms using the hanging-drop vapour-diffusion method. The type III and V crystals belong to monoclinic and hexagonal systems, respectively. All of the other crystal forms, types I, II, IV and VI, belong to orthorhombic s…
A Study of Bubble Nucleation in Foam Extrusion Die.
An experimental visual observation and theoretical study were carried out to investigate the dynamic behavior of bubble nucleation and growth in a foam extrusion die. In this study, a mixture of polypropylene and isobutane was extruded through a slit die with glass windows, and gas bubbles in the flow channel were obs…
Anomalous Magnetic and Transport Properties in Ce2Fe17 and Lu2Fe17
Using single phased Ce2Fe17 and Lu2Fe17 with the rhombohedral Th2Zn17-type and Th2Ni17-type structure, respectively, we performed measurements of magnetization and resistivity under various magnetic field up to 5.5T. Ce2Fe17 exhibits a simple helical spin structure with a wave vecter of τ= 0.0372 Å-1 parallel to the c…
Harmonic balance based bifurcation analysis of three-phase ferroresonance with full scale experimental validation
The determination of ferroresonant oscillations in circuits with voltage transformers is a highly nonlinear problem due to the possible core saturation. It is achieved with an algorithm based upon the harmonic balance method in the frequency domain. Advantages over a time domain description are discussed. Branches of…
Inhibition of Mild Steel Corrosion in Formic Acid Thiourea, 2-amino[4-p-choro phenyl] thiazole and Different Derivatives of their Condensation Products
The inhibitive effect of thiourea, 2-amino [4-p-chlorophenyl] thiazole and different derivatives of their condensation products, N-2[4-pchlorophenyl] 2-thiazolyl] thiocarbamide on the corrosion of mild steel in 20% formic acid solution has been studied using weight loss and electrochemical polarisation techniques. Dif…
Effects of Co on Magnetic Properties of YFe11Ti Compounds
Structural and magnetic properties of the Y(Fe1-xCox)11Ti compounds have been investigated. Substitution of Co for Fe does not change the crystal structure, but leads to a decrease of unit-cell volume. The Cure temperatures Tc increase clearly with increasing Co content. Composition dependence of the Curie temperature…
The Effect of Grain Size on the Threshold Stress for Superplastic Flow in Aluminum Alloys
Effect of grain size on the threshold stress for high strain-rate superplastic aluminum alloys was investigated. By taking account of the grain-size effect on threshold stress with the solidus temperature, it was demonstrated that the threshold stress data for many superplastic aluminum alloys with different grain siz…
Damage structure in austenitic stainless steel 316LN irradiated at low temperature in the HFIR
An austenitic stainless steel 316LN irradiated to damage levels of about 3 dpa at irradiation temperatures of about 90°C and 2 50°C has been examined by transmission electron microscopy. The irradiation at 90°C and 250°C induced a dislocation loop density of 3.5 × 1022 m−3 and 5.2 × 1022 m−3, and a black dot density o…
Article
La DNPA a trouv de trs nombreuses applications en science des matriaux, de la mise en vidence d'volutions structurales dans des alliages industriels aux tudes fondamentales de sparation de phases. Permettant la caractrisation d'inhomognts de taille comprise entre quelques distances interatomiques et prs de 1 pm, cette…
Synthesis of silicon carbide foams from polymeric precursors and their blends
Several polysilanes with different overall functionalities have been synthesized and pyrolyzed to produce porous silicon carbide. The polysilanes and their ceramic products have been characterized using gel permeation chromatography, Fourier transform-infrared spectroscopy, thermogravimetry, X-ray diffractometry and m…
X-Ray Photoelectron Spectroscopic Analysis of Crystalline Phases of Lead Zirconate Titanate Ceramics.
The Zr3d spectrum in the XPS measurement of PZT ceramics was found to vary according to their crystalline phases. The Zr3d spectrum of the rhombohedral phase was deconvoluted to the Zr3d5/2 profile at 181.3±0.2eV (denoted as A1) and the Zr3d3/2 profile at 183.6±0.2eV (A2), corresponding to a single chemical state. In…
The Compounding of Nitrile and Polychloroprene Rubbers with Rice Bran Oil
The use of rioe bran oil as a processing aid in styrene butadiene rubber has already been Investigated in this laboratory . Based on the encouraging results obtained from this study, we thought also of trying this oil inrubbers like nitrilebutadiene(NBR) and polychloroprene (CR) . In this study an attemptis madeto see…
Hopping dynamics in random energy landscapes: An effective medium approach
An effective medium approximation is given for single-particle hopping in lattices with site energy disorder. Based on this approximation the frequency dependent diffusion coefficient is calculated for a uniform distribution of site energies and the results compared with Monte Carlo simulations. Although the approxima…
Influence of continuous thermal ageing on the properties of XLPE used in medium voltage cables
This paper covers investigation results on electrical and mechanical properties of crosslinked polyethylene (XLPE), used as electrical insulation of medium voltage power cables, under thermal ageing stress. The authors have carried out continuous accelerated thermal ageing of cables at four levels of temperatures rang…
Radiation-enhanced precipitation in FeCu(C) alloys studied by electron microscopy
This study is aimed at understanding the fundamental mechanism of the embrittlement process in low alloy, reactor pressure vessel steel in a neutron irradiation environment. It has previously been considered that the radiation environment may induce the increment of the ductile-brittle transition temperature, which is…
Silicon-modified carbohydrate surfactants VIII. Equilibrium wetting of perfluorinated solid surfaces by solutions of surfactants above and below the critical micelle concentration—surfactant distribution between liquid-vapour and solid-liquid interfaces
For selected carbohydrate-modified Silicon surfactants of the siloxane, carbosilane, polysilane and silane type, the concentration dependences of the liquid/vapour and solid/liquid interfacial tensions under equilibrium conditions have been determined. Further, the Lifshitz–van der Waals and donor–acceptor contributio…
A kinetic study of the redox behaviour of FeIII(TPPS) [TPPS = 5,10,15,20-tetrakis( p-sulfonato)porphyrinate] in the presence of peroxomonosulfate, hydrogen peroxide, and sulfite/oxygen. Direct evidence for multiple redox cycling and suggested mechanisms †
The reactions of the water soluble complex FeIII(TPPS) [TPPS = 5,10,15,20-tetrakis(p-sulfonatophenyl)porphyrinate] with peroxomonosulfate, hydrogen peroxide and sulfite/oxygen have been investigated kinetically as a function of reactant concentration and pH. The spectral changes recorded for the reactions between the…