Materials Literature
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Biodeterioration/biocorrosion of concrete pipeline coating material by sulphate reducing bacteria (SRB) and Iron oxidizing bacteria was tested in the laboratory. The sulphate reducing bacteria and the Iron oxidizing bacteria were isolated from water samples collected from a swamp at a depth of 30 cm. The water samples…
Redox polymerization of acrylonitrile (AN) with methyl acrylate and fumaronitrile as comonomer and termonomer respectively, were carried out by using sodium bisulfite (SBS) and potassium persulphate (KPS) as initiator at 40° C. The effect of methyl acrylate (MA) and fumaronitrile (FN) on the glass transition temperatu…
The effect of the planar defects on the electrical transport properties was investigated in the non-stoichiometric titanium oxide; TiO2-x. TiO2-x with rutile structure is known to have a semiconductor property and planar periodic structure with lattice defects of oxygen vacancies. TiO2-x with point defects and planar…
アンダーポテンシャル析出（UPD）とは，水溶液中の金属イオンMz＋が金属Mとして析出する平衡電位よりも貴な電位領域で異種金属M'上に析出する現象である．UPDの一般的特徴について述べ，UPDが起きる電位領域の幅はM'とMの仕事関数の差に比例することを強調した．また，酸素還元反応，水素発生反応および金属腐食反応に及ぼすUPDの影響について述べ，反応機構に及ぼすUPD金属の役割を説明した．特にNi 基合金の微量Pbによる応力腐食割れに関連して，PbのUPDがNiの腐食に及ぼす影響について詳しく紹介した．さらに，UPD層の吸着構造から表面合金構造への変化やUPD金属と電解質アニオンの共吸着構造についても触れ，反応機構に及ぼすUPD金属の…
Abstract. In the character table of a finite group there is a tendency either for the character degree to divide the conjugacy class size or the character value to vanish. There is also a partial divisibility where the determinant of the character is not 1. There are versions of these depending on a subgroup, based on…
The ultrasonic velocity, density and viscosity of the mixtures namely, methylmethacrylate with methanol, p-dioxane and cyclohexane at 303K have been measured. From the measured data, some of the acoustical parameters such as adiabatic compressibility ( a ) , free length (L f ), free volume (V f ) , internal pressure (…
For a Fuchsian system $$ \frac{dY}{dx}=\Bigl(\sum_{j=1}^p\frac{A_j}{x-t_j}\Bigr)Y, \tag*{(F)} $$ $t_1,t_2,\dots,t_p$ being distinct points in $\mathbb{C}$ and $A_1,A_2,\dots,A_p\in{\rm M}(n\times n;\mathbb{C})$, the number $\alpha$ of accessory parameter
AbstractIn this paper, an intelligent technique for detecting the turn fault and supply voltage unbalances in an induction machine is proposed under varying load conditions. The proposed probabilistic neural network (PNN) technique is based on well-established statistical principles rather than heuristic approaches th…
The nanocomposite material based on polyamide-imide was not able to prevent nano-particles from aggregating up to now, therefore the development of this material was extremely difficult. However we prevented aggregation of nano-particles by developing the hygroscopicity solvent and copolyamide-imide, and commercialize…
We discuss the application of diamond machining to the fabrication of freeform infrared optical components and structures. Fabrication approaches, challenges, and experimental results are presented for several novel optical designs.
Pure Al baseplates integrated with AlN substrates for power modules were tried to produce by joining-casting process, and applicability of the directional solidification technique using chills was investigated. Although no fetal casting defects were observed in obtained integrated baseplates, string-like surface defec…
In this research, concentrations of hydrogen peroxide and dissolved ozone generated by direct current plasma within oxygen bubbles in water were measured. The current magnitude and water conductivity were changed from 1 to 7mA, and from 1 to 100 μS/cm, respectively. The highest efficiency of hydrogen peroxide generati…
A B S T R A C T The purpose of the study was to evaluate the water quality of urban streams in Santa Cruz do Sul, in the Brazilian state of Rio Grande do Sul, using physical, chemical and microbiological parameters. Eight sampling sites were distributed over the upper and lower reaches of four streams. Four sampling c…
LiSiON:Eu 2+ , Eu 2+ /Mn 2+ phosphors with compositions of Li 1-2 x- 2 y Eu x Mn y SiON ( x = 0−0.006, y = 0−0.006) were successfully fabricated using Li 4-2 x- 2 y SiO 4 : x Eu 2+ , y Mn 2+ and Si 3 N 4 as starting materials. The crystal and electronic structures, as well as the luminescence properties of Li 1-2 x- 2…
1 mol/dm3ペルオキソ二硫酸アンモニウムを用いた銅のエッチングレートに結晶構造が及ぼす影響を，Scanning Probe Microscope（SPM）とElectron Back Scatter Diffraction Patterns（EBSD），腐食電位測定により解析した。低指数面である(001)面や(101)面，(111)面のエッチングレートは低く，高指数面である(327)面や(425)面のエッチングレートは高いことが明らかになった。多結晶体の銅においても低指数面に優先配向している銅のエッチングレートは，高指数面に配向している銅のエッチングレートに比べて低く，約半分であった。また，エッチングレートが高い多結晶体の銅…
Dissimilar material joining is a key process in manufacturing multimaterial products. The objectives of this research is to produce and evaluate dissimilar metal joints of SPCD low carbon steel and A5052 aluminium alloy with sandwiching polyethylene terephthalate (PET) plastic for both joint strength and galvanic corr…
以乙酰丙酮铜、醋酸锌、二氯亚锡、油胺和硫粉为前驱体, 采用one-pot 法合成出了单分散的Cu2ZnSnS4 (CZTS)纳米晶. 所得样品采用X 射线粉末衍射仪(XRD), 能量色散谱仪(EDS), 透射电子显微镜(TEM), 高分辨透射电子显微镜(HRTEM), 光电子能谱仪(XPS), 紫外-可见光谱仪(UV-vis)和Z-扫描(Z-scan)技术对其结构组成、形貌、性能等进行了表征. 结果表明: 所获得的产物为四方相结构的六边形CZTS 纳米颗粒, 直径约为10 nm. 计算出尺寸大小为10 nm,13 nm 的纳米晶的三阶非线性光学折射率γ (-1.08×10-15, -9.08×10-17 m2·W-1), 三阶非线…
In order to analyze the combustion synthesis reactions of Co-Al intermetallic compounds, Co/Al premixed compacts were quenched during the combustion synthesis. Additionally, Co wires were dipped into molten Al, and the compound formation reactions between Co and molten Al were investigated.From microstructure observat…
It was clarified that the promotion of the crystallization of rare earth monophosphide during welding solidification by increasing Nd content was effective to decrease the solidification cracking susceptibility of fully austenitic weld metal with a large amount of Phosphorus. The decrease of solidification cracking su…
The efficiency of thermoelectric device is determined by the material's thermoelectric figure of merit ZT=S2σT/κ. Therefore, low thermal conductivity κ is essential to achieve high ZT value. Here we show the high-temperature thermoelectric properties of α-Ag9GaTe6. Polycrystalline high-density bulk samples of α-Ag9GaT…