Materials Literature
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For development of mixed conductors, we synthesized BaIn1-xMxO3-delta (M= Ti, V, Cr, Mn, Fe, Co, Ni, or Cu) by substitution of transition metals for indium. The BaIn1-xMxO3-delta has orthorhombic, tetragonal or cubic structure depending on the kind and amount of the transition metals at room temperature. The structura…
Frequency dependences of dielectric constant (epsilon r'), electrical conductivity and weight change were investigated for the perovskite-type oxide system BaCe1-xYxO3-delta (x=0.05~0.l5), which is a typical proton conductor. The sample with x=0.15 showed the maximum values in both proton conductivity and water conten…
The thermal properties of microelectromechanical systems (MEMS) devices are governed by the structure and composition of the constituent materials as well as the geometrical design. With the continued reduction of the characteristic sizes of these devices, experimental determination of the thermal properties becomes m…
RARE EARTH ION DOPED SOLID MATERIALS. Rare earth ion doped solid state materials are the most important active media of near-infrared and visible lasers and other photonic devices. In these ions, the occurrence of Excited State Absorptions (ESA), from long lived electronic levels, is commonplace. Since ESA can deeply…
A procedure was developed for measuring the kinetic parameters of growth of carbon fibers in the catalytic pyrolysis of hydrocarbons. In this procedure, the dependence of the averaged length of grown fibers on growth time is constructed based on the measurements of fiber lengths with an optical microscope. The procedu…
Recently, a kind of titanium alloy which has outstanding properties, such as low elastic modulus, high strength, super elasticity and super plasticity has been developed by TOYOTA Central R & D, Inc. and named “gum metal”. Because of a new alloy, the mechanical properties of gum metal has not been clarified enough. In…
Diamond-like carbon (DLC) is usually classified into 4 kinds: tetrahedral amorphous carbon (sp3 rich), ta-C; amorphous carbon (sp2 rich), a-C; hydrogenated ta-C, ta-C:H; hydrogenated a-C, a-C:H. In this review paper, first, general properties of DLC, conventional preparation methods, and tutorial explanations of catho…
Millscale is an oxide layer formed during the manufacturing processes of the pipe. Standard corrosion specimen preparation as recommended by ASTM G1 includes the cleaning and removal of the millscale layer, often by abrasion or acid pickling. These cleaning techniques can act to change the mechanical surface propertie…
The incorporation of silver into the diamond-like carbon (DLC) coatings has shown excellent potential in various applications; therefore the surface and tribological properties of silver-containing DLC thin films deserve to be investigated. In this study we have deposited silver-containing hydrogenated and hydrogen-fr…
Nanofiber assemblies have been attractive materials for many engineering and medical applications because of their large surface area to volume ratio and unique porous structure. This study has demonstrated the concept that nanofiber assemblies can be used as receptor for Infrared Spectroscopy (FT-IR). In this study,…
Lead zirconate titanate (PZT) films were deposited by inductively coupled plasma (ICP)-assisted aerosol deposition (AD) method. The influence of RF power was investigated for the deposition rate and microstructure of the PZT films. With our experimental deposition system, the deposition rate of PZT film was approximat…
A comparison of data obtained by using different formulae for predicting ratios of effective attenuation lengths to inelastic mean free paths for energetic (with energies up to 15 keV) electrons, and experiments is given for the case of several elemental solids such as Si, Ni, Cu, Ge, Ag, W and Au. The results demon-…
The heat-resistant Ti alloys have been developed to replace Ni-based superalloys conventionally used for discs and blades in the compressor part of jet engines. DAT54 is a newly developed near-alpha Ti alloy in Japan, is serviceable up to 600°C. Titanium has a high solid solubility limit of oxygen and is susceptible t…
Feasibility of retrofitting seismically vulnerable buildings, designed in accordance with out-dated building codes, was studied by externally inter-connecting to an adjacent building, constructed in accordance with present building codes, at floor levels with connecting elements at floor levels, so that the use or the…
In this paper we study the Cahn-Hilliard-Gurtin system describing the phase-separation process in elastic solids. The system has been derived by Gurtin (1996) as an extension of the classical Cahn-Hilliard equation. For a version with viscosity we prove t
本報告は, 高強度コンクリートや高強度主筋を用いたRC部材が, 曲げ降伏するときの変形にっいて検討したものである。RC造建物の構造設計で一般的に用いられている曲げ降伏変形計算方法は, 普通強度の材料を用いた実験データに基づいて求められているため, 高強度材料を用いた場合には適合性が良くないことがある。そこで, 梁部材について高強度材料を用いた場合にも適用可能な曲げ降伏変形の簡便な評価式を導いた。高強度コンクリートを用いた柱部材は圧縮軸力が高く, 主筋の圧縮降伏が引張降伏に先行する傾向があり, 梁部材の曲げ降伏変形と同様に評価することは困難であり, 平面保持を仮定した断面解析に基づいた評価を試みている。
Photolithographic process is one of the eco-friendly processes for forming the pattern of the barrier ribs in PDP. Controlling the refractive index of glass is important to develop a photosensitive paste for photolithographic process. We studied the refractive index and the structural transition of these glasses by me…
Introduction M-type BaFe12O19 is ferrimagnetic below Tc = 723 K. The magnetic structure has the collinear spin configuration, where all the magnetic moments of five independent Fe sites are ordered parallel or antiparallel to c axis. The strong uniaxial anisotropy plays a supporting role as a starting material for per…
This work aims at studying of an efficient way for synthesizing nano-sized particles of lead-bismuth alloy and illustrating their fabrication mechanisms from SEM morphologies. With highly ordered nano-channels developed on the surfaces of anodic aluminum oxide (AAO) template, the lead-bismuth eutectic (Pb45Bi55) as ho…
The characteristic of worsted spinning procedures and the BP neural network modeling technology all have been summarily analyzed. Based on the nonlinear and vague relationship depend on fiberspsila performance and craft parameters, the grey superior theory and correlation analysis method are proposed to select more im…