Materials Literature
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We solve the complete tensor fluctuation problem of a long and straight nematic disclination line with a general winding number in the one elastic constant approximation. Focusing on the eigenmodes growing in time, we show that the disclination with strength higher than 1/2 is unstable with respect to the splitting an…
A new method for preparing a novel antistatic polyacrylonitrile (PAN) fiber modified by nano-antimony-doped tin oxide (ATO) particles is proposed. Nano-ATO particles are first dispersed in water by the dispersant polyethyleneimine PEI, then the nano-ATo suspension is applied in a pre-heating bath during spinning of PA…
In this fourth paper of a series on the effective elastic properties of alumina-zirconia composite ceramics the influence of porosity on the effective tensile modulus of alumina and zirconia ceramics is discussed. The examples investigated are alumina and zirconia ceramics prepared from submicron powders by starch con…
In the study of Plastic Surgery, cell culture may be used at experimental level in researches concerning biosynthesis functions of skin cells such as fibroblasts, keratinocytes, adipocytes, chondrocytes and osteocytes. The present study reports an experimental model for estimation of collagen in cell cultures using ch…
Este trabalho teve como objetivo avaliar o comportamento da madeira de Grevillea robusta na produção de painéis de madeira aglomerada. Os painéis foram produzidos em densidades de 0,60 e 0,80 g/cm³ e conteúdo de resina de 6 e 8%. Os resultados de propriedades físicas e mecânicas dos painéis fabricados com densidade de…
Abstract The dinuclear iron( II ) complex {[Fe(CH 3 bipy)(NCS) 2 ] 2 bpym} has been synthesised and its crystal structure determined at 293 K. The magnetic properties display intramolecular antiferromagnetic coupling at 1 bar ( J = −4.2 cm −1 ), and the onset of a pressure‐induced spin conversion is observed at 11 kba…
Abstract Palaeozoic to early Mesozoic rocks of both autochthonous and allochthonous units of the Eastern Tauride Belt have different textural and mineralogical features related to their varying deposition regimes and thermal histories. The Devonian and Carboniferous formations in the allocthonous units have anchizonal…
Understanding how a gas is able to strongly insulate electric devices is certainly of great importance to the electrical engineering community. More precisely, modeling how a dielectric gas stops an electric current requires to understand what makes a gas a good dielectric, or in other words, what makes a gas presenti…
A digital image processing technique using the Fourier transformation in the spatial domain and the Wiener filter has been developed. This method is applied to the measurement of the accumulated charge on the opposite sides of a planar insulator using an electrostatic probe. In the spatial frequency domain, the relati…
Abstract Synthetic and room temperature single crystal X-ray structural characterizations are recorded for adducts of copper(I) cyanide formed by crystallization of copper(I) cyanide from (unidentate) pyridine (‘py’) bases L, of 1:2 (L = py; new phase), 1:1.5 (L = 2-methylpyridine, ‘2mp’) and 1:1 (L = quinoline, ‘quin…
The need to deliver fast-in-market and right-first-time design for ultra-low-emission vehicles at a reasonable cost is driving the automotive industries to invest significant manpower in computer-aided design and optimization of exhaust after-treatment systems. To serve the above goals, an already developed engineerin…
Broccoli is a vegetable of important economic value as well as a source of vitamin C and anticarcinogenic property substances. Although it can be minimally processed, this vegetable presents fast senescence, characterized by yellowing, loss of turgescence, development of off-odors, increase in enzymatic activity and r…
Abstract The transformation of a powder diffraction profile into a set of correlated integrated intensities allows crystallographic calculations to be performed without modelling raw diffractometer counts. By carrying out this transformation it is possible to preserve the information about peak overlap without needing…
Abstract Moisture and temperature effects were investigated on silica/(triethoxysilylpropyl) disulfide (TESPD)/carbon black (CB)/S‐SBR compounds with respect to processability, vulcanization characteristics, physical properties, and alcohol residues. The moisture‐treated compounds exhibited lower rates of viscous heat…
The thermal degradation of wood treated with basic nitrogen compounds and phosphoric acid was studied in air and nitrogen by differential thermal analysis and thermogravimetry from ambient temperature to 650°C. From the resulting data, kinetic parameters for different stages of thermal degradation were obtained follow…
Random parallel nanostructures (ridges and channels) were created by scratching gold thin films deposited on glass slides. Atomic force microscope (AFM) images showed that the width of the substructures within the scratches were of the order of a few hundred nanometers. These nanometric gold features can then support…
The paper present the synthesis of a series of nylons as constituent polymers of parts obtained by rotational molding via activated anionic copolymerization of caprolactam with laurolactam. The initial mold temperature (initial polymerization temperature) was kept constant at 160° for all experiments. The initial laur…
Abstract Fe-rich smectites from lateritic weathering profiles have previously been studied by XRD, ICP-AES, SEM-EDX and TEM-EDX analyses (Gaudin et al ., 2004). These smectites exhibit intermediate chemistries between five end-members: Al-Fe beidellites, Al-Fe montmorillonites and Mg+Ni-saponite. The spectroscopic stu…
Two novel homoleptic diazaporphyrinato lanthanide sandwich com-plexes M(2)(DAP)(3) [M = Ce (1), Eu (2); DAP= 2,8,12,18-tetra-ethyl-3,7,13,17-tetramethyl-5,15-diazaporphyrinate] were synthesized by a one-pot reaction of the corresponding M(acac)(3).nH(2)O (acac = acetylacetonate) with metal-free D(2)(h) type diazaporph…
Abstract The crystallographic nature of modular structures is analysed and discussed in terms of their symmetry and structure building operations. The modular crystal structures we discuss in this paper are homogeneous edifices, built by one or more types of modules related by a point-space operation, and the whole st…