Materials Literature
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The crystal structure of shcherbakovite from Mount Rasvumchorr, Khibina massif, Kola Peninsula, Russia, ideally K2 Na Ti 4+ 2 O (OH) (Si4O12), a 8.1538(4), b 10.5569(5), c 13.9882(6) A, V 1204.1(2) A 3 , space group Imma, Z = 4, Dcalc 3.194 g/cm 3 , has been refined to R1 = 3.2% for 960 unique (Fo > 4� F) reflections…
PREPARED BY SPIN AND DIP-COATING. The conditions for the preparation of luminescent materials, consisting of Eu 3+ ions entrapped in a titanium matrix, in the forma of a thin film, using the sol-gel process, are described. The films were obtained from sols prepared with TEOS and TEOT, in the presence of acetylacetone…
The reactions of N -dichlorophosphoryl- P -trichlorophosphazene, Cl 3 P=N--P(O)Cl 2 with the sodium salts of cyclopentanol, cyclohexanol, 4-methylcyclohexanol, 3-methylcyclohexanol, 3-methylcyclopentanol are discussed. Pentacycloalkoxy-substituted phosphazenes were obtained from cyclopentanol, 4-methylcyclohexanol, 3-…
We present a theoretical study of macrotwins arising in cubic to tetragonal martensitic transformations. The results help to explain some features of such macrotwins observed in Ni 65 Al 35 .
Nanocrystalline yttrium aluminum garnet (YAG, Y 3 Al 5 O 12 ) was synthesized by pyrolysis of complex compounds of aluminum and yttrium with triethanolamine [(HOCH 2 CH 2 ) 3 N, (TEA)]. Loose and porous precursor was obtained on complete dehydration of the metal ion–triethanolamine complexes. Pure YAG powder was obtai…
Abstract New aromatic polyimides and polyamide‐imides with phenylquinoxaline rings and dimethylsilane units have been synthesized by solution polycondensation reaction of aromatic diamines containing phenylquinoxaline units with bis(3,4‐dicarboxyphenyl)‐dimethylsilane dianhydride, or with a diacid chloride resulting f…
New niobium beryllide Nb 3 Be with A15 structure and lattice parameter a =0.5187±0.0007 nm, coexisting (3–5%) with a tetragonal phase, presumably, of an ordered solid solution with parameters a =0.5414±0.0008 nm and c =0.6378±0.0009 nm, was synthesized by thermal treatment (875–110°C) of amorphous film coatings contai…
Abstract A solution to environmental pollution by polymer plastic wastes can be their chemical modification in to useful products. Such a new solution is the obtaining of effective flocculants for sewage treatment from chemically modified phenol‐formaldehyde resin production wastes (SE and NS novolak) and expanded pol…
In recent years nanostructured materials have been the subjects of intensive research due to their superior physical and mechanical properties. The present study is a review of our own works on the processing and investigation of nanostructured TiNi-based shape memory alloys. Various methods of production have been de…
Austenitic stainless steels (SS) are known to be susceptible to caustic stress corrosion cracking (SCC) at temperatures higher than ~121°C. However, when sulfides are present in caustic solutions the SCC of austenitic SS has been reported to occur at lower temperatures. Hot sulfide-containing caustic solutions are of…
Poucos trabalhos relacionam a reserva de K em solos desenvolvidos sob clima tropical úmido com os minerais presentes na fração argila. Com esse propósito, coletaram-se amostras de 19 solos no Triângulo Mineiro, originados de diferentes materiais de origem e estádios de desenvolvimento. Dada a significativa ocorrência,…
In this study, redesigning for equal functional properties and rapid prototyping of hot forged automotive parts based on commercially available wrought magnesium alloys (AZ80) and composites (AZ80/SiC/12p) were performed. To achieve the same functional properties in a forged automotive component irrespective of the st…
In this paper we study the bubble dynamics driven by an aspherical acoustic field, based on the theory of hydrodynamics. Evolution equations for an aspherical bubble are derived under the aspherical acoustic driving. The numerical calculations show that the aspherical bubble can oscillate stably and periodically under…
This paper describes the practical application of the ultra-high-frequency (UHF) partial discharge (PD) detection method which VA TECH Reyrolle has routinely applied to high-voltage onsite commissioning tests on gas-insulated substations (GISs) for more than 10 yr. The location of the PD sensors has a significant effe…
In an effort to progress in our understanding of the ageing mechanisms of high voltage cables submitted to electrical and thermal stresses, we present a quantitative study of voids, the defects which are considered to be partly responsible for cable failure. We propose a method based on large data sets of transmission…
Abstract In this work, a new methacrylate phosphonate monomer synthesis was described according to two routes: firstly, by condensation of methacrylic acid with a phosphonate epoxide and secondly by an esterification between methacryloyl chloride and a phosphonate diol. The photoinduced polymerization of this new mono…
Willem Norde Marcel Dekker (2003), 448 pp. ISBN: 0-8247-0996-9 $150 / $94 / €133
Several types of microfiltration membranes — polypropylene, cellulose diacetate (nominal pore size=0.2 μm) and polycarbonate (pore size=0.4 μm) — were tested for their microorganism retention ability. Suspensions of Pseudomonas diminuta and bovine red blood cells (RBC) were used for experimental purposes as representa…
Anisotropy is important to the structure and application of nonwoven fabrics. The arrange ment of the fibers and their orientation distribution are related to the mechanical structure of the web. In this study, we used a doffer of the roller card accompanied by a random roller to produce nonwoven fabrics. Partial rand…
The purpose of HV after-laying tests on cable systems on-site is to check the quality of installation. The test on extruded MV cable systems is usually a voltage test. However, in order to enhance the quality of after installation many researchers have proposed performance of diagnosis tests such as detection, locatio…