Materials Literature
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Three-dimensional simulations of bidisperse bubble swarms rising in a liquid have been carried out. This article describes the microstructure of a swarm of mostly spherical bubbles representing 6% void fraction. The swarm consists of an equal number of large and small bubbles with volume ratio 2. While the behavior of…
Electron spin resonance (ESR) studies show that electron irradiation of an f -TeO 2 single crystal followed by 330-nm UV illumination at ∼10 v K generates a new spin-1/2 paramagnetic center having C 2 symmetry, like the Te lattice sites, that is attributed to a self-trapped charge on a Te. Identification is facilitate…
The crystal structure and the dielectric properties of (1 m x )Pb(Yb 1/2 Nb 1/2 )O 3 m x Pb(Sc 1/2 Nb 1/2 )O 3 (PYN 1 m x PSN x ) (0 h x h 0.50) solid solution have been studied. According to our XRD study, the room temperatures crystal structure of PYN 1 m x PSN x becomes pseudocubic from the PYN's orthothombic with…
The number of materials systems used to make magnets on an industrial scale is limited. They are, in chronological order of appearance, AlNiCo (late 1930s), hard ferrites (1950s), the family of Sm-Co magnets which gave rise to two different magnet groups, SmCo5 (late 1960s) and Sm(CoFeCuZr)7–8, often referred to as th…
The pulsed electroacoustic (PEA) method has been used to measure space charge distributions in insulating materials. A high-resolution PEA measurement system and signal procedure have been reported in previous papers. Since the signal procedure is necessary for high-resolution measurement, the system must include a co…
Magnetic properties and structures of TiN-, TiCN- and TiC-coated silicon steel sheets were investigated. The tensile stress in these ceramic coated silicon steel sheets and adhesion were also determined by measuring the angle curvature after coating one side with ceramic and by observation after 180° bend-forming, res…
Epitaxial (Ni-Zn)Fe2O4 thin film was prepared on Si(001) substrates using (MgO-Al2O3)/CeO2/YSZ triple buffer layer. In this work, to increase remanent magnetization (Mr) and decrease coercive field (Hc), for epitaxial (Ni-Zn)Fe2O4 thin film, the effect of substrate temperature, oxygen pressure and composition on the m…
La corrosion induite par les micro-organismes, le plus souvent appelée biocorrosion, implique tous les phénomènes de corrosion où les micro-organismes agissent directement soit par l’intermédiaire de leur métabolisme (production d’acides, de sulfures, ...) en jouant un rôle primordial, en accélérant un processus déjà…
カーボンブラック (CB) 充てんポリプロピレン (PP) /ポリエチレン (HDPE) ポリマーブレンドの電気抵抗率に及ぼすCB粒子の局在化の影響について検討した. まず, CB粒子をPPと混合した. 引続きCB/PP複合材料とHDPEとを混合して, 逐次混練複合材料を作製した. 最初PP相中に分散していたCB粒子は, 逐次混練試料中ではPP相からHDPE相へ移動しようとする. その結果, CB粒子はPP/HDPE界面に局在化する. PP相およびHDPE相がともに連続相であるとき, PP/HDPE界面に局在化したCB粒子はブレンド中で導電性ネットワークを形成することが期待される. 逐次混練試料は同時混練試料よりも低い常温電気抵抗…
We describe a strategy for the design of noncentrosymmetric organic thin films with thermodynamically stable polar order. We report the thermal and optical properties of a group of hydrogen bonding liquid crystalline (LC) monomers. The self-assembly of these LC materials could lead to improved polar stability and proc…
The title compound, La14V6CuO36.5, was prepared from a stoichiometric mixture of La2O3, V2O5, and CuO at 1050–1080 °C. The compound forms transparent, pale green crystals and was characterized by wavelength dispersive spectroscopy and single crystal X-ray diffraction. The structure contains isolated VO43− tetrahedra a…
Thermal diffusivity of synthetic forsterite was measured in the temperature range from 350 to 1500 K at 0 and 6 GPa. Reciprocal thermal diffusivity cannot be regarded as a linear function of absolute temperature. Thermal diffusivity of forsterite increases by ca. 40% over 6 GPa.
Crystal structures of CVD diamond particles were observed in detail by transmission electron microscopy. The particles were deposited on silicon substrates under various conditions and had different levels of adhesion. An interlayer of SiC was found along the interface obtained with low methane concentration in the so…
Four-point bending tests were conducted with smooth specimens of poled and non-poled lead zirconate titanate (PZT) ceramics with a tetragonal structure. The specimens poled in the longitudinal, transverse and shorttransverse directions were called PL, PT and PS specimens, respectively. The non-poled specimens were cal…
The aim of this work was to get a better understanding of the O 1s binding energies Eb(O1s) in complex glasses of interest in nuclear waste storage in relationship with the mean charge on the oxygen atoms, relevant to acidic/basic properties of the glass. Three different glasses were considered: an aluminum borosilica…
Nanostructured spinel NiZn ferrites were prepared by the sol-gel method from metal nitrate raw materials. Analyses by X-ray diffraction and scanning electron microscopy showed the average particle size of NiZn ferrite was under 50 nm. The single phase of NiZn ferrites was obtained by firing at 250℃, resulting in nanop…
In the last thirty years, ongoing and fast developments of numerical techniques for the particular questions concerning electrical machinery can be noticed. This development can be seen in parallel with the efforts and success of the softand hardware computer industry in producing powerful tools. Computers as well as…
The electrochemical polymerization of catechol on platinum has been carried out using repeated potential cyclingbetween -0.2 and 1.1 V (versus SCE). The electrolytic solution consisted of 0.2 mol dm-3 catechol, 0.5 mol dm-3 NaCl and0.1 mol dm-3 Na2HPO4 with pH 8.72. Catechol can not be polymerized at pH ≥ 10.12. Polyc…
Influence of carboxymethyl cellulose (CMC) on the inhibition efficiency of 1-hydroxyethanole-1,1-diphosphonic acid (HEDP)- Zn2+ system in controlling corrosion of mild steel immersed in a neutral aqueous environment containing 60 ppm Cl- has been evaluated by weight loss study. The formulation consisting of 10 ppm Zn2…
Ferrites with the spinel structure have a wide field of technological applications. In the present study, various ferrite (Fe, Co and Ni-Zn) nanoparticles were synthesized by mechanochemical reaction in aqueous solution of various chlorides (FeCl3, CoCl2 and NiCl2/ZnCl2) and NaOH in a horizontal ball mill. Structures,…