Materials Literature
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No município de Formosa da Serra Negra, sul do Maranhão, às margens da rodovia MA006, encontram-se afloramentos de basaltos intemperizados da Formação Mosquito, apresentando textura bastante argilosa e potencial de ser um material bentonítico. Neste trabalho, esse material que vem sendo considerado uma nova ocorrência…
The results of numerical simulation of radiation-thermal forming for bearing shells of reflectors for reactors BN-600 and BN-800, made of various austenitic steels, with the help of parameters of models for radiation swelling, radiation creep, and plasticity, are presented. Based on an analysis of the results, we show…
Amorphous carbon (a-C) coatings can reliably be produced with a maximum secondary electron yield (SEY) close to 1 at room temperature. Measurements at low temperature (LHe) are in progress. Analysis by X-ray Photoemission Spectroscopy (XPS) shows a correlation between the lineshape of C1s spectrum in XPS and the maxim…
JUSTIFICATIVA E OBJETIVOS: O ângulo de abordagem peridural é um dos fatores determinantes da profundidade de inserção da agulha para se atingir o espaço peridural. A margem de segurança contra punção acidental da dura-máter deve ser afetada pelo ângulo de abordagem porque o espaço disponível para o movimento da ponta…
ISHS XXVIII International Horticultural Congress on Science and Horticulture for People (IHC2010): III International Symposium on Plant Genetic Resources CRYOPRESERVATION OF PEACH SHOOT TIPS BY ENCAPSULATION DEHYDRATION
With the rapid development of nanotechnology, nanometer material is used more and more widely. The contact of human beings, animals, plants and nanometer materials has become inevitable. This paper summarizes the progress of biologic security research of a variety of typical carbon nanometer material metals and oxide…
Abstract Nontronite is a significant component of commercially important nickel laterite ores. Its behavior during high-pressure acid leaching of such ores may have an impact upon the efficiency of the process. The present study was conducted in order to further investigate the response of this material during high-pr…
The quantity and quality of heat transfer to food are important factors in cookware. They depend on temperature degree and Temperature Distribution (TD) on top surface of pan that is exposed to food. The heat is not uniformly spread over the pan so is appeared hot spots on the cooking surface. Using Multi-Layer Plate…
The weathering of hemp fiber influences their appearance and mechanical properties. The aim of this study is to better understand the mechanism of aging of hemp fiber exposed to different conditions (moisture, heat and UV aging). A xenon aging test machine was used to simulate and accelerate the natural ageing. The in…
In this work, we studied the fabrication of 12-nm-size nanodot pattern by self-assembly technique using high-etching-selectivity poly (styrene)-poly (dimethyl-siloxane) (PS-PDMS) block copolymers. The necessary etching duration for removing the very thin top PDMS layer is unexpectedly longer when the used molecular we…
Abstract Polyhedral oligomeric azido‐octaphenylsilsesquioxane (N3‐OPS) was synthesized from octaaminophenylsilsesquioxane (OAPS) via its diazonium salt. The synthesis included nitration of octaphenylsilsesquioxane (OPS) to octanitrophenylsilsesquioxane (ONPS), conversion of ONPS into octaaminophenylsilsesquioxane (OAP…
The reaction kinetics of methane combustion over La 1-x Ca x FeO 3 perovskites (x=0.0, 0.2, 0.4) was studied. The results show that the catalytic activity is higher in the calcium-doped perovskites. It is found that this higher catalytic activity is related to a lower activation energy. The value of the activation ene…
Bent-core mesogens are attracting great attention because of their potentially biaxial and polar nematic phase. In this paper, we review the results of our recent X-ray diffraction studies on the nematic phase of oxadiazole-based mesogens. The evolution of the small-angle diffraction signal with temperature points to…
It is established that charge carrier (hole) transport in the Al-Se95As5〈EuF3〉-Te structure is effected by unipolar injection currents limited by space charges with the involvement of two capture trap groups. Shallow traps corresponding to charged intrinsic defects C 1 − are related to broken selenium bonds. Deep trap…
Abstract Bipedal thiol, whose end is modified with iodoarene, is synthesized and introduced onto the surface of gold nanoparticles. The obtained nanoparticles allow the Suzuki–Miyaura and Sonogashira cross-coupling reactions to form the carbon–carbon bond on the surface of the nanoparticle without serious aggregation…
For the purpose of recycling waste polycarbonate (PC) products, PC hollow microspheres were prepared using waste PC products via a microencapsulation method. In the microencapsulation process, dichloromethane was the suitable organic solvent of the oil phase, and the optimal adding amount of gelatin was 1.7 g in 70 g…
The results of the modification of AG-OV-1 activated carbon under various conditions (by atmospheric oxygen at elevated temperatures and by hydrogen peroxide or ozone) are given. The effect of the used modifier on changes in the porosity, surface state, and adsorption capacity of activated carbon is evaluated.
This study aims to evaluate the effects of colchicine on metabolic and structural changes in Bacillus megaterium ACBT03, enduring colchicine bioconversion. Electron microscopy examination of cells adapted to different concentrations of colchicine for its bioconversion to pharmacologically active 3-demethylated colchic…
Abstract Waterborne siloxane-containing polyurethanes (WSPU) were prepared by polyaddition reaction using poly(tetramethylene oxide)glycol (PTMG), polyethylene glycol (PEG), and α,ω-aminopropyl polydimethylsiloxane (APDMS) as mixing soft segments; 2,2-di(hydroxymethyl)propionic acid, as a hydrophilic chain extender; 1…
In this paper electrode miniaturization with prospective use in electro-catalysis or as sensors is proposed. To this purpose it was postulated that dispersion of metal particles in a polymer matrix increases the effective area, on the same geometric area. In addition, the catalytic effect would significantly improve t…