Materials Literature
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An ensemble averaging technique is used to obtain both macroscopic equations of transport phenomena in a two-phase region and new models of permeability and thermal conductivity of the columnar mushy zone through the analysis of most likely configurations of the local microstructure. The obtained formulae are incorpor…
Thin-film thermoelectrics (TECs) are potential candidates for cooling microprocessors due to their large cooling power density and ability to integrate with packages. In addition, there are no moving parts or noise generated during their operation. In particular, thin-film TECs offer the ability to cool localized regi…
Processes of crystallization of calcium oxalate from aqueous solutions are investigated. Main regularities of the nucleation and crystal growth of calcium oxalate during mass crystallization without admixtures and in the presence of amino acids are established. The inhibiting action of the aspartic and glutamic amino…
An experimental research work was carried out to produce microcellular foam in an injection molding process. Microcellular foams are identified by a porous structure containing cells on the order of 10 μm in size. In this work, a conventional molding system was modified and a gas injection module was devised and integ…
A numerical model aimed at simulating the segregations during the columnar solidification of a binary alloy is used to investigate the effects of a forced convection. Our objective is to study how the segregation characteristics in the mushy zone are influenced by laminar flows driven both by buoyancy and by AC fields…
Abstract Summary: This article gives a review on self‐assembled nanofibrillar aggregates such as helical, twisted ribbon‐like and tubular forms, those are produced in aqueous bilayer membrane and organogel systems. Two common features necessary for the chemical structure that yields special morphology are a chiral car…
The purpose of this work is to study the effect of bulk point defects on the electronic structure of rutile TiO2. The paper is focused on the effect of oxygen nonstoichiometry in the form of oxygen vacancies, Ti interstitials and Ti vacancies and related defect disorder on the band gap width and on the local energy le…
Abstract Reaction of the /i-bis(tridentate) ligand H 3 L' (L' = 1,3-bis[N-(5-cliloro-2-hydroxybenzylidene)- 2-ainiiioetliylene]-2-(5-cliloro-2-hydroxy!phenyl)iniidazoliduie) with eopper(II) chlonde diliydrate gives the chair-piperazine bridged complex [Cu 2 (μ-L)Cl 2 ]. The halves of the binuclear complex are related…
Blendas de polipropileno e elastômeros termoplásticos (TPEs), estireno-b-butadieno-b-estireno (SBS) e estireno-b-etileno-co-butileno-b-estireno(SEBS) foram preparadas com o objetivo de avaliar a influência do tipo e da concentração do elastômero nas propriedades mecânicas e na morfologia das blendas. Foram utilizados…
Pure Ta 2 O 5 has been investigated as a possible environmental barrier coating (EBC) material for silicon nitride‐based ceramics, but was found to be inadequate because of localized buckling and the formation of microcracks. To address these issues, alloying additions were explored to improve some of the properties o…
A theoretical model for the calculation of the optical gain coefficient of indirect-band-gap semiconductors is presented. An explicit formula for the calculation is derived from the second-order time-dependent perturbation theory of quantum mechanics, which incorporates all the eight possible processes of photon/phono…
Dissipative particle dynamics is a model of multi-phase fluid flows described by a system of stochastic differential equations. We consider the problem of N particles evolving on the one-dimensional periodic domain of length L and, if the density of particles is large, prove geometric convergence to a unique invariant…
A manufacturable, broadband, broad-angle antireflection (AR) coating for the visible (13 designs submitted) and a minimum-shift immersed short-pass filter (12 designs submitted) were the subjects of the design contest held in conjunction with the 2004 Optical Interference Coatings topical meeting of the Optical Societ…
Purpose To examine a simple testing method of measuring the force to pull a fabric through a series of parallel pins to determine the fabric softness property. Design/methodology/approach A testing system was setup for fabric pulling force measurements and the testing parameters were experimentally determined. The spe…
Glasses with the nominal compositions SrFe 12 O 19 + n Na 2 Sr 2 B 4 O 9 ( n = 4, 6, 8, 10) and SrFe 12 O 19 + 6Na 2 Sr 3 B 4 O 10 were prepared via rapid quenching of oxide melts and were then heat-treated between 500 and 800°C in order to produce glass-ceramics containing fine SrFe 12 O 19 particles. The materials w…
A single phase hexagonal close packed Zircaloy 2 was cold deformed to different reductions by laboratory rolling. Systematic characterisations of the structural developments were carried out. Bulk texture developments were gradual, strongest developments being noticed at the highest strain. Although formation of well…
PALINOLOGY OF LOWER PERMIAN AT THE DCLS-24 WELL (SAN GREGORIO FORMATION), CERRO LARGO DEPARTMENT, URUGUAY. PART 1: SPORES, ALGAE, PRASYNOPHYCEAE, AND ACRITARCHS. The palynological con- tents of four samples of the borehole DCLS24 (made by DINAMIGE) are analysed. Their lithology con- sists of black laminated clay forme…
Abstract The regional distribution, mineralogy, petrology and chemistry of the detrital and authigenic clay minerals associated with the Permo-Triassic strata (excluding the Rotliegend: see Ziegler, 2006; this volume), of the onshore and offshore regions of the British Isles are reviewed within their stratigraphical f…
Abstract Persulfurierte Arene sind zwar schon seit etwa 50 Jahren bekannt, ihre Chemie ist aber trotz der einfachen und effizienten Synthesen unter milden Bedingungen nur unzureichend untersucht. Ihre Eigenschaften (Redoxpotentiale, UV/Vis‐Absorption, Leitfähigkeit, nichtlineare optische Eigenschaften) sind einerseits…
Four kinds of Li and Co codoped ZnO (LCZO) thin films have been prepared by a sol-gel process technique. X-ray diffraction results revealed that the LCZO thin films possess single ZnO wurtzite structure and c-axis preferred orientation, and Li and Co ions substitute for the Zn sites without changing the wurtzite struc…