Materials Literature
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Polycrystalline ceramics of SmBi 3 Ti 3 O 12 were prepared by the solid state reaction method. Extensive impedance studies were carried out on these samples. From the measurements, it was observed, that low concentrations of a rare earth substituent for the bismuth site showed broad dielectric and impedance peaks. Fer…
Recent applications of infrared and Raman spectroscopy in the study of the metamict (or "amorphized") state, high-temperature recrystallization and radiation-induced OH species in natural zircon (ZrSiO4) and titanite (CaTiSiO5) are reviewed.
The thermal conductivity of a range of materials has been measured by a transient needle probe technique. These include graphite, Perspex, AFS testing sand, and silica microspheres. Particular attention is paid to measurement on powders, for which packing density is important. This work forms part of an NPL project to…
Two cladding methods for NdFeB powders, i.e., the modified organic silicon (MOS) cladding and the dichromate passivation reducing (DPR) cladding are exploited respectively for the preparation of polymer-bonded magnet and metal-bonded magnet. The effects of their cladding conditions and coating compositions, together w…
Mesoporous Ta oxide with a pore size of ca. 22 Å and a BET surface area of 486 m2 g−1 was reduced by bis(toluene)Ti in the presence of dinitrogen and the product characterized by XPS, XRD, elemental analysis, nitrogen absorption, and variable temperature conductivity measurements. The XPS spectrum shows three differen…
The aqueous phase interaction of divalent Sr with silicate-containing solutions was studied over a range of pH values, dissolved silica, and Sr concentrations, and extending to basic solution (0.2 M NaOH) at room temperature (22-23°C). Formation of an amorphous Sr silicate phase of variable composition was observed, b…
THE BEHAVIOR OF POLY-VINYLIDENE FLUORIDE (PVDF) UNDER BOMBARDMENT OF DIFFERENT KINDS OF RADIATION IS OF INTEREST DUE TO THE POLYMER'S UNIQUE PIEZO-ELECTRIC PROPERTIES AND VARIOUS CRYSTALLINE FORMS. IN THIS WORK, PVDF FILM SAMPLES OF 0.3 MM THICKNESS AND DENSITY 1.76 G/CM3 WERE IRRADIATED WITH 4 MEV PROTONS FROM THE IN…
Se estudió el efecto del quitosano aplicado como recubrimiento sobre la calidad postcosecha de la mandarina ‘Fortune’. Las mandarinas fueron enceradas con una solución acuosa de quitosano al 0,6 ó 1,25% y almacenadas a 20ºC durante 15 días simulando la comercialización. Como control se utilizó una cera comercial de po…
Proceedings of the 11th International Symposium, 7-9 October 2002, Columbus, Ohio. This proceedings volume includes papers covering a broad selection of topics related to advanced materials processing and fabrication. Contents: Superconducting, magnetic, and other functional materials; Hydrogen storage materials; Inte…
The photoluminescence spectra of silica xerogel samples synthesized with ethanol as solvent and xerogel where the ethanol was exchanged by water before drying are reported. In addition, the photoluminescence spectrum of a silica cryogel synthesized with tert-butanol as solvent was investigated. The samples were modifi…
This work experimentally studies the fundamental mechanism by which the ultrasonic vibration enhances natural convection and pool boiling heat transfer. A thin platinum wire is used as both a heat source and a temperature sensor. A high speed video imaging system is employed to observe the behavior of cavitation and t…
According to the historical experiences of the large-scale pollution flashover in China power systems,this paper presents the suggestionstoadjustthecurrentexternalinsulationdesignstandardsandcleaningrules.Itisemphasizedthattheeffectiveanti-pollutionflashover design should not depend on cleaning and the values of pollu…
The physicochemical properties and functional activities of chitooligosaccharides are more superior than chitin and chitosan, so chitooligosaccharides becomes a new developing kind of functional oligosaccharides worldwide in recent years. Research development of the physiological activities of chitooligosaccharides su…
Three point bending (rectangular bar) specimen was made from sintered Al2O3/SiC composite and commercial Al2O3. A semi-elliptical surface crack 100μm in diameter (aspect ratio≈0.9) was introduced on the sample by indentation method. The sample was subjected to the following crack-healing treatment; Al2O3/SiC composite…
Lotus-type porous brass has been fabricated by utilizing solid-state diffusion of zinc into porous copper which has been made by unidirectional solidification in pressurized hydrogen gas. The Zn diffusion has been carried out by thermal annealing of the porous copper. Zn was deposited by electroplating or vapor deposi…
Epoxy resin systems with different amounts of hardener were prepared. Bisphenol A type epoxy resin prepolymer was used and the hardener was m-xylylenediamine. Specimens were immersed in water, 10wt% sulfuric acid solution and 10wt% sodium hydroxide solution at 80°C. The epoxy resins showed high corrosion resistance to…
Development of a Novel Electrochemical Method to Deposit High Corrosion Resistant Silicate Layers on Metal Substrates , Veeraraghavan, Basker, Haran, Bala, Slavkov, Dragan, Prabhu, Swaminatha, Popov, Branko, Heimann, Bob
This paper demonstrates howthe rotational foam molding process can be employed for the manufacture of plastic articles that have a distinct layer of nonfoamed skin surrounding a foamed core or layer. It is focused on the singlestep processing principle, the main feature of which is the simultaneous introduction of bot…
The outcome of high-energy collisions of tetrathiafulvalene radical cations, TTF˙+, strongly depends on the nature of the collision gas. Thus, bond cleavage of the central fulvalene bond is promoted by an inert gas, such as helium, whereas oxidation to the dication is a significant reaction channel when molecular oxyg…
Two types of diffusion couples, U–23 mol%Zr with U–23 mol%Zr–1.3 mol%Ce and U–95 mol%Zr with U–23 mol%Zr–1.3 mol%Ce, were annealed isothermally at 1123 K and 1023 K in order to provide basic data on Ce diffusion in U–Zr alloys, which are the fuel forms for advanced nuclear reactors. Because the Ce solubility in the U–…