Materials Literature
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The aim of this thesis project is to design and fabricate a high efficiency on chip cooling device based on the Peltier effect. Bismuth telluride (Bi2Te3) and antimony telluride (Sb2Te3) are employed to form thermocouple for their high Seebeck coefficient and high figure of merit. The models of the devices are simulat…
以[Ni（CN）4]^2-为构筑基元,与过渡金属离子Mn^2＋通过溶液缓慢扩散法合成出二维Hofmann类氰基桥联配位聚合物Mn（H2O）2[Ni（CN）4]·4H2O（1）,并解析了其晶体结构.配位聚合物1属正交晶系,空间群Cmcm,晶胞参数a=0.73080（5）nm,b=1.21372（8）nm,c=1.40875（9）nm,α=β=γ=90°,Ni和Mn中心通过氰桥交互连接构成二维波浪形层状结构.通过混合法得到系列Hofmann类配位聚合物M（H2O）2[Ni（CN）4]·xH2O（M=Mn,Fe,Co,Ni,Cd）的粉末样品,粉末XRD结果表明,系列配位聚合物具有与1相同的晶体结构;变温粉末XRD和热重分析结果表明,系列…
The effects of normalizing treatment process on carbide morphology and mechanical properties of wear resistant white cast iron were studied by means of optical microscope, SEM and mechanical property test. The results show that normalizing treatment process can improve the carbide morphology and mechanical properties…
Based on the B3LYP density functional theory, the equilibrium geometries, electronic structures and vibration frequencies of the C80 fullerene arid its derivatives C80X12 (X=H, F, Cl, Br) were studied using 6-3lG basis set to theoretically predict the stability of C80X12. The geometry, total energy, frontier orbital e…
Novas fases estacionarias (FE) fluoradas foram preparadas a partir da imobilizacao do poli(metil-3,3,3-trifluorpropilsiloxano) (PMTFS) em particulas de silica Kromasil de 5 mm, por tratamento termico (TT) ou por radiacao micro-ondas (RM). As condicoes de imobilizacao otimizadas atraves do emprego de planejamento de ex…
In order to prepare defoamer which possesses the characteristics of both organosilicone and polyether, Si-O-C polyether modified organosilicone defoamer was prepared by reacting methyl silicone with polyether via condensation polymerization. The results manifested that the optimum reaction conditions were as follows:…
Polymer composites reinforced with fibers are of great interest in the automotive industry, with emphasis to epoxy resin reinforced with glass fibers However, these fibers exhibit abrasive behavior causing wear of equipment, making it \nsusceptible to the loss of properties due to the breakdown of fibers during proces…
Este trabalho foi desenvolvido objetivando o estudo do efeito da corrosao por meio da agua que esta associada a producao do petroleo, principalmente em pocos de campos maduros, como e o caso da UN-SEAL. Ressalta-se que esta agua e conhecida na industria do petroleo como agua produzida. A amostra da agua produzida util…
L’étude porte sur l’élaboration et la caractérisation des propriétés mécaniques de composites architecturés alumine / acier inoxydable 316L. Les matériaux obtenus sont doublement composites dans le sens où ils sont constitués d’un empilement de couches successives (architecture), chacune de ces strates étant elle-même…
Epitaxial graphene, grown on SiC(0001) surface, has been widely studied both experimentally and theoretically. It was found that first epitaxial graphene layer in such structures is a buffer layer i.e. there are no characteristic Dirac cones in the band structure associated with it. However, C. Riedl et al. (Phys. Rev…
A series of catalysts on the basis of 10 wt.% CuO/γ -Al2O3, 10 wt.% CuO + 10 wt.% Cr2O3/γ-Al2O3 and 15 wt.% MnO2/γ-Al2O3 have been prepared and modified by CeO2 with contents up to 20 wt.%. Physico-chemical properties of the catalysts were determined by the methods of BET Adsorption, XRD, and TPR. Oxidative activity o…
Objective To assess the validity of PKH26 dye for labeling the bone marrow mesenchymal stem cells (BMSCs) and the feasibility of this method for tracing the seed cells of tissue engineering nerve in vivo. Methods BMSCs isolated from Wistar rat's bone marrow were labeled with the PKH26 dye, the marked validity was obse…
Sodium titanate nanotubes were prepared hydrothermally and sodium ions were exchanged for hydrogen ions by washing with water and further treatment with HCl. No anatase or rutile was produced during the exchange. Photo-catalysts were prepared by calcination and their activity was compared in UV-A and simulated sunligh…
Thermal variation of dielectric properties of two thermotropic liquid crystalline mixtures (code names: ZLI 1221 and ZLI 1291) containing identical moieties but possessing different mesogenic ranges have been investigated. Both mixtures contain the same constituents: phenyl cyclohexane, biphenyl cyclohexane, and cyclo…
Abstract Nowadays, automotive heat exchangers are mainly made from aluminum. Over the last few decades, the development of aluminum brazing sheet has been mainly focused on the improvement of the external corrosion resistance. Recently, the interest of the heat exchanger manufacturers has also moved toward the assessm…
DEDICATÓRIA Dedico este trabalho em memória à minha madrinha Ademira, aos meus avôs Mariana e Antônio, que sempre me acompanharam em todas as etapas da minha vida.A minha irmã Cibele pelas diversas sugestões pertinentes ao meu desenvolvimento profissional.Aos meus amados pais Dirce e Ariston que nunca pouparam esforço…
Given a tiling $\mathcal{T}$ of the plane by straight edge polygons, which is invariant by two independent translations, we construct a family of embedded triply periodic minimal surfaces which desingularizes $\mathcal{T}\times\mathbb{R}$. For this purpose, inspired by the work of Martin Traizet, we open the nodes of…
Embora possam ser atribuidas ao bambu inumeras possibilidades de utilizacao, duas grandes desvantagens sao apresentadas por esse material. A primeira refere-se a baixa durabilidade natural da maioria das especies, devido a presenca de amido em suas celulas parenquimaticas. A outra desvantagem, nao menos importante, e…
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Tidal tails composed of stars should be unstable to the Jeans instability and this can cause them to look like beads on a string. The Jeans wavelength and tail diameter determine the wavelength and growth rate of the fastest growing unstable mode. Consequently the distance along the tail to the first clump and spacing…