Materials Literature
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In order to safeguard the silicon vertex tracker in the BABAR detector from excessive radiation damage, cumulative dose and instantaneous dose rates are continuously monitored. As an upgrade to the current radiation monitoring system, which uses silicon p-i-n diodes, we are examining the possible use of single-crystal…
Abstract Preparation of conducting polymers incorporated within porous materials, that is, zeolites and mesoporous materials, is an attractive methodology to obtain composite materials where the organic polymer may exhibit an increased mechanical and chemical performance compared to the pure polymer. For any applicati…
Gd 2 O 3 :Eu phosphor particles of spherical shape, filled morphology, and high brightness were prepared by large-scale spray pyrolysis. The morphology control of Gd 2 O 3 :Eu particles was attempted by adding organic precursors in a spray solution. The influence of chain length of organic additives and introduction o…
Hydrothermally synthesized barium titanate, BaTiO 3 (commercially available), has internal pores in small particles. The three‐dimensional structures of the pores were successfully observed using transmission electron microscopy (TEM) and reconstructed by a tomography system. The behavior of the internal pore is obser…
Abstract By means of the combined use of XPS and scanning electron microscopy + energy dispersive spectrometry (SEM + EDS) the study of the surface microchemical structure of two archaeological Roman mirrors is carried out in order to obtain useful information to identify the ancient production technology, the degrada…
Nous avons determine le comportement structural d'un compose synthetique derive de la sodalite, et ayant la composition Ca 8 [Al 1 2 O 2 4 ](CrO 4 ) 2 , a pression ambiante et au cours d'un chauffage entre 463 a 982°C, en utilisant la diffraction X in situ sur poudre, avec rayonnement synchrotron [λ = 0.91997(4) A] et…
We have discovered surface-enhanced infrared absorption (SEIRA) on a planar silver halide surface, the first time this effect has been observed on a non metallic substrate . The enhancement is not due to the presence of metallic silver on the surface as ruled out by X-ray photoelectron spectroscopy (XPS). In addition,…
Studies were made of the adsorption and acidic properties, the coordination state of the Co ion in Co 2 +, Co 3 +-containing ZSM-5 zeolite systems and the catalytic activity of these zeolites in CO oxidation. A correlation was established between the catalytic activity of these Co-containing zeolites and the number of…
The crystal structure of arapovite, ideally U4+ (Ca,Na)2 (K1– x □ x ) [Si8 O20], x ≈ 0.5, tetragonal, a 7.5505(4), c 14.7104(9) A, V 838.6(1) A3, space group P 4 /mcc , Z = 2, D calc. 3.365 g/cm3, was refined to an R 1 index of 2.9% based on 528 observed [ F o > 4σ F ] unique reflections measured with Mo K α radiation…
This research centres on surface initiated damage on back-up rolls whereby rolling contact fatigue cracks can propagate into the rolls potentially reaching the internal stress fields and leading to catastrophic failure and has sought to establish design criteria for avoiding such failures. The project objectives have…
Abstract Thin films of zirconium titanate ZrTiO 4 (ZT) were prepared by the MOCVD technique. ZT layers were deposited in air on silicon substrates by using a non‐conventional MOCVD system. The chemical composition of these films was investigated by XPS. More information on the thin film structure was obtained from the…
Terbium-and (Ce, Tb)-containing glasses prepared using the direct sol-gel-glass transition are studied. It is shown that glasses doped with one activator contain two main types of optical centers, namely, isolated and complex centers, which are characterized by weak and strong cross-relaxation quenching of luminescenc…
Tight requirements posed by the increasingly stringent legislation complicate the design procedure for exhaust aftertreatment devices and systems. Since design optimization relies heavily on experiments and tests, emissions test data acquisition should comply with strict quality standards. Time-varying exhaust emissio…
In Part I of this series, air pressure and air velocity are measured on an air-jet filling insertion simulator with tube and profiled reed. In this second part, the filling yarn insertion time is measured on the air-jet filling insertion simulator with the profiled reed, and yarn velocity is calculated. The effects of…
Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.
Nickel alloy steam generator tubes of pressurized water reactors (PWR) are sensitive to stress corrosion cracking (SCC) and the possibility of predicting SCC from electrochemical measurements is of considerable interest for nuclear industry. The electrochemical properties of several nickel-based alloys were studied at…
The effect of 4th generation poly(amidoamine) dendrimer (4G PAMAM) present in an anionic phospholipid composition, consisting of hydrogenated soyphosphatidylcholine (HSPC), cholesterol (CH), dicetyl phosphate (DCP), and poly(ethylene glycol) (Mw approximately 2000) derivatized phosphatidylethanolamine (PEG2000-PE), on…
Em uma indústria de móveis estofados, localizada em Piracicaba, SP, foram coletados aleatoriamente corpos-de-prova de painéis compensados e OSB para determinação das propriedades de resistência (MOR) e rigidez (MOE) à flexão estática, com as finalidades de compará-las e avaliar a possibilidade de substituição direta d…
This paper presents measured results of the two-dimensional vector magnetic properties in electrical steel sheets under high frequency excitation conditions. The relationship among the maximum flux density, the magnetizing direction, the exciting frequency, the axis ratio of the rotating flux density(the ratio of the…
The molecular dynamics (MD) calculation was performed for minor actinide (MA: Np and Am) dioxides in the temperature range from 300 to 2,500K to evaluate the thermophysical properties viz., the lattice parameter, thermal expansion coefficient, compressibility, heat capacity, and thermal conductivity. The Morse-type po…