Materials Literature
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We theoretically study the stability conditions of the ferroelectric ice of the Cmc21 structure, which has been considered, for decades, one of the most promising candidates of the low temperature proton-ordered phase of pure ice Ih. It turned out that the Cmc21 structure is stable only with a certain amount of dopant…
زمينه و هدف: ماده پلاستيکی CR-39 با فرمول شيميايی C10H18O7 علاوه بر کاربردهای مختلف علمی و تحقيقاتی ، بهترين گزينه برای عدسیهای پزشکی میباشد. رنگ CR-39 در اثر تابش ليزر و فوتونهای پر انرژی تغيير میکند. CR-39 به تابشهای آلفا نيز بسيار حساس است. در اثر توقف ذرات آلفا ردپاهايی در آن ايجاد میشود. در طول مسير هر ردپا…
Author: Klein, M.-C. G. et al.; Genre: Journal Article; Issued: 2010-07-10; Keywords: MPI für Metallforschung; Abt. Arzt; ; Title: Material properties of the skin of the Kenyan sand boa Gongylophis colubrinus (Squamata, Boidae)
The effect of support calcination temperature on the benzene selective hydrogenation performance of the Ru-Fe-B/ZrO2 catalysts was investigated. It was found that with increasing calcination temperature, the surface area decreased, the pore size and the amount of monoclinic phase increased. With increasing support cac…
The ceramic method was used to produce Aurivillius phase materials, B i \\(_3\\)NbTiO\\(_9\\) and Bi\\(_4\\)Ti\\(_3\\)O\\(_1\\)\\(_2\\). Unit cell structures have been determined to be of A2\\(_1\\)am and Fmmm symmetry, respectively. In addition, the fractional co-ordinates of the constituent atoms has been calculated…
This thesis concerns the characterization of rare earth doped fluoride glasses and glass ceramics. The interest of such materials and systems to achieve ultra-transparent with low losses and also with low phonon frequency avoiding the normal processes that limit the performance of laser emission. The study is based on…
浆细胞瘤源于骨髓,并以浆细胞异常增生为特征.临床上以多发性浆细胞骨髓瘤多见,而发生于脊柱的孤立性骨浆细胞瘤(solitary plasmaeytoma of bone,SPB)较为少见,文献对该病的影像表现报道较少.笔者搜集11例经病理证实的发生在脊柱的孤立性浆细胞瘤,总结其CT和MRI表现。
We consider self-affine tiling substitutions in Euclidean space and the corresponding tiling dynamical systems. It is well-known that in the primitive case the dynamical system is uniquely ergodic. We investigate invariant measures when the substitution is not primitive, and the tiling dynamical system is non-minimal.…
A complex of samrium perchlorate with L-alpha-Valine acid, [Sm-2(L-alpha-Val)(4)(H2O)(8)](ClO4)(6), was synthesized by the reaction of samarium perchlorate and L-alpha-Valine acid in distilled water. The title complex was characterized by chemical analysis, elemental analysis, FTIR and TG/DTG. Low-temperature heat cap…
The synergistic inhibition effect of rare earth Ce(superscript 4+) and vanillin (4-hydroxy-3-methoxy-benzaldehyde) on the corrosion of cold rolled steel (CRS) in 3.0 mol/L H3PO4 solution was studied by mass loss, potentiodynamic polarization and UV-Vis spectrophotometry (UV-Vis). The present study reveals that vanilli…
The electrospinning ployacrylonitrile nanofibers membrane (PANNFM) is hydrolyzed to prepare the hydrolyzed polyacrylonitrile nanofibers membrane (HPANNFM), and it is used as an adsorbent to remove and recovery copper ions from the aqueous solution. The samples before and after hydrolysis are characterized with FE-SEM…
O açaí é fruto do açaizeiro, uma palmeira natural da Amazônia brasileira, encontrada próximo dos igarapés. Na região Norte existe um grande consumo da polpa do fruto do açaí, com um acúmulo de resíduo sem manejo adequado. Este resíduo provoca malefícios para a saúde pública e transtornos ambientais. No presente trabal…
Learning electromagnetic field theory through abstract mathematical equations alone is a challenging task to most students. They look upon the subject as a difficult, abstract, and highly mathematical matter. The author has thus developed a modeling and simulation tool with special features designed for teaching elect…
A carbon nanotube (CNT) Schottky diode based on coaxial geometry is presented. We show that coaxially gated CNT field effect transistors (FETs) with a p-type semiconducting single-walled carbon nanotube (s-SWNT) and asymmetric contacts can provide good diode characteristics. The effect of different physical and electr…
X-ray powder diffraction (XRD) along with differential thermal analysis (DTA) carried out on the as-quenched samples in the 3BaO-3TiO2-B2O3 system confirmed their amorphous and glassy nature, respectively. The dielectric constants in the 1 kHz-1 MHz frequency range were measured as a function of temperature (323-748 K…
"n "n "nBackgrounds and Objectives: Carcinogenic and mutagenic potential of some azo dyes as a category of common dyes in different types of industries has been reported. The degradation of one commercially available dyestuff [C.I. Reactive Red 198 (RR 198)] by means of ultraviolet radiation (UV), ultrasonic irradiati…
Este trabalho esta relacionado a pesquisa sobre principios de hidraulica para aplicacao no dimensionamento de sistema de hidrantes prediais. Procura-se demonstrar a importância do estudo da hidraulica para o dimensionamento de sistema de hidrantes, bem como para o desenvolvimento de normas e especificacoes relativas a…
The frequency and temperature dependence of the dielectric constant, electric modulus and electrical conductivity of the transparent glasses in the composition 0.5Li2O-0.5Na2O-2B2O3 (LNBO) were investigated in the 100 Hz - 10 MHz frequency range. The dielectric data have been analyzed using Cole-Cole equation with an…
We analyze the heat capacity CP for low and high-density amorphous ice below the transition temperature (TC ≈ 140 K ) using a power-law formula. The renormalized critical exponent αR is extracted from the observed CP data, which describes similar critical behavior for both low and high-density amorphous ice below TC.…
Friction Stir Welding (FSW) is a suitable technology for aerospace structure development and is a possible replacement for mechanical fastening. To achieve the application of FSW, pre and post-weld treatments are required. A pre-weld treatment of surface preparation was required to ensure a weld with good mechanical p…