Materials Literature
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The present study, on the optimisation of the scale-up of a Friedel−Crafts acylation, joins together experimental calorimetric techniques and simulation techniques. The adopted methodology involved the execution of isothermal tests at different temperatures, using the reaction calorimeter RC1, to obtain the heat flow…
Continuing a series of modeling studies of the influence of reshuffling of polymer segments on the polydispersity index (PDI), the additional effect of cyclization was analyzed by means of Monte Carlo simulations. It was shown that the contribution of cyclization in overall reshuffling process can be important only in…
A number of preharvest and postharvest factors alter textile quality, including cotton variety, growth environment, harvest method, lint cleaning, and combing. In this work, the impact of three planting dates in 1997 and 1999 on fiber properties, mote, neps, and white specks is monitored. Cotton is hand picked, ginned…
Abstract Ferromagnet/semiconductor DyN/GaN superlattice structures were grown on SiC substrate by radio frequency molecular beam epitaxy. Formation of DyN was confirmed by X‐ray diffraction measurements. The temperature dependence of the photoluminescence (PL) spectra for the DyN/GaN superlattice and GaDyN samples was…
Abstract With the reduction of critical dimensions (CD) of physical gate lines, standard methods for evaluating bottom CD from the scanning electron microscope (SEM) signal become inaccurate. The two peaks, originating from the line edges, merge into a single peak, and the correct position of the topographical top and…
Image analysis of the living, marine planktonic diatom, Neodenticula seminae (Simonsen et Kanaya) Akiba et Yanagisawa, collected during summers of 1996–99 off northeast Japan, the Kurile Islands and in the Bering Sea revealed significant intraspecific morphological variability. SEM observations showed the internal val…
The kinetics of crystallization limit the rate in which crystal growth can occur without in-corporation of undesired impurity. If the rate of heat transfer exceeds the mass transfer rate of the inpurity, the impurity can solidify, contaminating the product. One would like to specify a rate of crystallization and deter…
Thermodynamical, optical-texture and dielectric studies have been performed to study the phase diagram of the binary system of 5-cholesten-3β-ol-octanoate and 4-n-nonyloxybenzoic acid. It is observed that low concentrations of 5-cholesten-3β-ol-octanoate (2–30 mol %) in 4-n-nonyloxybenzoic acid induce a mean-field pha…
An AISI 430 (UNS S43000) stainless steel sheet was cold-rolled and then annealed at 1,073 K, to derive three different grain sizes. Through Devanathan hydrogen permeation tests at 303 K and a mathematical analysis for diffusion in laminate structures, the grain boundary diffusion coefficient (Dg = 1.14 × 10−15 cm2/s)…
The products from the reaction of octahydrosilsesquioxane (T 8 -H) with different molar ratios of phenol and undec-1-ene or methyl 3,3-dimethylpent-4-enoate (MDP) in the presence of chloroplatinic acid have been analysed by 29 Si NMR spectroscopy. The distribution of the two different pendant groups leads to tetrad pa…
The paper presents a numerical model of image transfer in screen-printing that is supported by experimental data. The model focuses on a roller squeegee system. It combines thin film hydrodynamic behaviour with roller squeegee deformation and flow through a porous screen. The work within this investigation has, for th…
Abstract The rubber from commercially obtained high-ammonia latex (commercial HA-latex) increased in gel content significantly after long preservation of the latex with 1.0% w/v tetramethylthiuram disulfide (TMTD) and zinc oxide (ZnO). Deproteinization of the HA-latex did not decrease the gel content. The gel fraction…
Abstract A substituted porphyrinatoplatinum(II), meso-tetrakis(4-t-butylphenyl)porphyrinatoplatinum(II), has been spectroscopically and structurally characterized. The 1H NMR signal from the β-protons of the pyrrole ring is observed as a singlet with a full-width at half maximum of 1.6 Hz, contrary to the reported qua…
A method of studying the quenching of luminescence of cyclometalated ethylenediamine complexes of Pt(II) by molecular oxygen is developed. The bimolecular rate constants of quenching are determined.
An intercrosslinked network of varying percentage of vinyl ester oligomer (VEO) modified unsaturated polyester matrices has been developed. Vinyl ester oligomer was prepared by reacting commercially available epoxy resins GY 250 (Ciba-Geigy) and acrylic acid and was used as toughening agent for unsaturated polyester (…
Crystals of NaBaBO 3 were grown by spontaneous crystallization on a platinum loop from the BaO-B 2 O 3 -Na 2 O system using the flux technique. The crystals have a highly disordered block structure. X-ray diffraction study λMo K α, 518 independent reflections, R = 0.0272) demonstrated that the structure of these cryst…
Coagulation-flocculation of the colloids particles present in the cuttlefish effluents was investigated using a coagulation step with aluminium sulphate (SA), followed by a flocculation step with starch, SiO2 or MgO and then poly dimethyl ammonium chloride (PDMAC), in order to reduce the turbidity and chemical oxygen…
Variable polarization compensation has been demonstrated at 100 GHz. The device consists of two interlocking V-groove artificial dielectric gratings that produce a birefringence that varies with the separation distance. A maximum retardance of 74/spl deg/ has been obtained experimentally in a silicon device, in good a…
Abstract A series of ceramer coatings were formulated using blown soybean oil as the organic phase, and sol‐gel precursors [titanium( IV ) isopropoxide, titanium( IV ) diisopropoxide bisacetoacetonate, and zirconium propoxide] as the inorganic phase. The corrosion resistance of the ceramer coatings was evaluated using…
The effect of functionalization of random styrene-butadiene copolymers (SBR) and type of functional group on the interaction with fillers like carbon black and silica was analysed. The SBR were functionalized using tin (R3SnCl) and organosilane (RSi(OR′)3) compounds. The polymers, functionalized and non-functionalized…