Materials Literature
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The crystal structure of the intermediate phase (3MgO·2CO2) of synthetic nesquehonite (MgO·3H2O) following heat treatment was solved by Monte Carlo simulation using powder X-ray diffraction data and was confirmed by Rietveld refinement. The phase is cubic with space group I4¯3m and cell constants of a = 8.516(13) Å. T…
Mathematical models of electrostatic actuation have been developed since the 1960s, beginning with the work of Taylor, and are of great utility in a number of engineering systems. They are of particular use in the field of micro- and nanoelectromechanical systems, where models have typically dealt with planar geometri…
This paper presents a methodology for tile image reconstruction. This methodology is integrated in a computer tool that allows automatic image analysis. Both, the reconstruction and analysis techniques are based on vectorial tools, the application of the theory of symmetry groups and perceptual psychology. Image analy…
In this paper, vapor-grown carbon fiver (VGCF), which is a kind of carbon nanotubes (CNT), is used for the composite materials with aluminum matrix. It is found out that the thermal conductivity of the composites is about 2.5 times higher than that of the pure aluminum of the matrix if the direction of VGCF is aligned…
Dans des echantillons recoltes entre les mois d'avril 2004 et aout 2006 dans des reservoirs et lacs peu profonds du Sud de l'Espagne nous avons trouve plusieurs algues vertes planctoniques interessantes de la famille des Botryococcaceae (Trebouxiophyceae, Chlorophyta). Une espece est decrite comme nouvelle, Lobocystis…
In this work the gelling time of silica alkoxide obtained by sol-gel process has been investigated. The Investigations are made with three variable parameters: water to TEOS molar ratios (1.4, 2, and 10), different pH values and reaction temperatures (25, 40 and 55 ◦ C). The study shows that, the reaction temperatures…
Recently, there is much interest in the antimicrobial activity of silver since silver has known to be safe and effective as a disinfectant or an antimicrobial agent against a broad spectrum of microorganisms. Although silver has been applied to various kinds of products due to the effective antimicrobial activity, the…
Organic nanotubes are hollow fibers formed through the self-assembly of amphiphilic molecules in a solvent. Because nanoparticles and proteins can be included within their hollow interiors, such nanotubes can be applied to a wide range of fields. To promote the practical use of organic nanotube, we have developed a st…
トロポノイドの構造的な特徴を活かした機能物質として, トロポノイドジチオクラウンエーテル, トロポノイドアザマクロサイクル, トロポノイド液晶並びにオイルゲル化剤を合成した。トロポノイドジチオクラウンエーテルは高い水銀 (II) イオン親和性を示し, 液膜輸送における優れた水銀 (II) イオンキャリアとして利用できた。トロポノイドアザマクロサイクルは特定のゲストカチオン存在下で, その色調が変化することから, アミノトロポン構造はクロモフォアとして利用できることを見出した。これらトロポノイドを基盤にした機能物質 (水銀イオン液膜輸送キャリア, クロモイオノフォア, 液晶, オイルゲル化剤) の機能や機能発現機構を解明した。
An air-drawing model of the polylactic acid (PLA) spunbonding process is presented and solved by introducing numerical computation results of the air jet flow field of an aerody namic device. At the same time, the model is also verified by experimental results obtained with our university’s equipment. The influence of…
We investigated effect of annealing after rubbing by grazing incidence X-ray diffraction, since annealing process is performed in the actual process of liquid crystal display (LCD) fabrication. It was found that rubbed surface polymers were highly crystallized by annealing at 250°C after rubbing, and that the crystall…
Se obtuvo una gama de polioles a partir del aceite de ricino modificado por transesterificación con pentaeritriol y glicerina. Los productos resultantes fueron caracterizados físico-químicamente. Se sintetizaron elastómeros de poliuretano a partir de los polioles derivados del aceite de ricino modificado. La densidad…
We compare the threshold voltage and subthreshold-slope characteristics as measures of short-channel effects (SCEs) for graphene-channel field-effect transistors (GFETs) with wide bilayer armchair-graphene film with those for ultrathin-body silicon-on-insulator (UTB-SOI) MOSFETs using a drift-diffusion-based device si…
Insulation defect detection in time ensures higher operational reliability of power system assets. Power transformers are the most critical unit of power systems both from economical and operational front. Hence it becomes necessary to have knowledge of the actual insulation condition of transformer to increase depend…
In this paper, we propose an improved method to analyze the scattering problem by dielectric gratings with dielectric rectangular cylinders sandwiched between two multilayers, by combining an improved Fourier series expansion method and multilayer method for both TM and TE waves.Numerical results are given for the inf…
鉄鋼材料の水素脆化挙動とその機構を環境因子ならびに材料因子の観点から検討した．水素侵入およびその水素脆化への影響を，大気環境および高圧水素ガス環境において調査した．大気環境における水素透過試験により，温度，湿度，鋼表面の付着塩分などの環境因子が水素侵入と高強度鋼の遅れ破壊に大きく影響することが明らかになった．また，高圧水素ガス環境および陰極チャージ下での低ひずみ速度引張試験により，水素脆化感受性が表面水素濃度で整理できることが確認された．高強度低合金鋼の水素脆化機構と水素脆化防止法を鋼中の析出物 (第二相) に着目し検討した．ナノサイズの炭化物は水素トラップ量を増加させた．粒界に沿って析出した炭化物は粒界破断型の水素割れを促進した…
Ni-based superalloy single crystals were grown by different methods (gradient method and Bridgman technique with spontaneous nucleation and with seed). In all crystal growth experiments using the Bridgman technique, the temperature gradient along the vertical furnace axes was constant (G = 33.5 ?C/cm). The obtained si…
Single phase cubic spinel nanocrytalline particles of Al doped Ni0.2Cd0.3Fe2.5O4 has been synthesised by sol-gel method with an average crystallite size of ∼5 nm. The dielectric constant (ε′) and ac conductivity (σac) shows normal behaviour with frequency. The dielectric properties and ac conductivity in the samples h…
Calorimetric measurements have been performed in glassy Se75Te15M10 (M=Sb, Sn) alloys to study the effect of Sb and Sn additives on the kinetics of glass transition and crystallisation in glassy Se85Te15 alloy. Activation energy of glass transition (E g) and the activation energy of crystallisation (E c) have been det…
An anionic, "naked" copper sulfide cluster, [Cu(16)S(10)](4-), was synthesized by treating multi-copper starting materials with the hydrosulfide salt, (nBu(4)N)SH. The sixteen copper atoms in [Cu(16)S(10)](4-) are arranged in a square gyrobicupola with eight mu(3)- and two mu(4)-sulfido ligands.