Materials Literature
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It is known that the LuAG:Ce single crystals usually contain various unwanted structural defects (mainly antisite defects) which can result in nonradiative recombination and in delayed luminescence decay (afterglow). The concentration of these defects decreases with the decreasing temperature of the crystal growth. Th…
This study deals with the influence of Ti addition on softening behavior of the martensite structure and precipitation behavior for 2 1/4Cr-1Mo-V steel. The fine MX type (Mo, V) C and (Mo, V, Ti ) C precipitate with heat treatment at from 600 to 700 deg. C after cooling from 1350 deg. C. These fine carbides coarse wit…
In order to examine the deformation behavior of a silicon nano-helix grown by the glancing angle deposition technique, tensile experiment was conducted with in-situ scanning electron microscope observation. An isolated nano-helix was prepared by removing neighboring nano-helices using a removable probe, and the top en…
Environment problems are calling more and more attentions, so magnesium is a candidate due to its advantages such as light weight and high strength. However, it is difficult to deal with magnesium at a room temperature because of its poor ductility and heating device is need. So friction stir incremental forming proce…
Flow blockage is difficult to analyze in reactor accidents. The multi-layer annular fuel assembly, consisted by annular-type fuel plates, has a good heat transfer performance, but multi-layer-type channels in it are of complex geometries, which are easily blocked. It is necessary to study the flow and heat transfer be…
In this study, a finite element analysis based on a dislocation-based crystal plasticity model considering a size dependence of a critical resolved shear stress (CRSS) is performed to reproduce a size dependence of yield stress in a micropillar composed of single crystal of Mg-based LPSO phase. The CRSS model in which…
A finite element model is used to study the transient thermo-elastic-plastic contact between a thermal asperity sensor and a thermal asperity. The temperature change of the thermal asperity sensor is determined during contact with an asperity. The results show that sensor temperature is a function of the operational t…
Heat treatment is ordinarily conducted to reduce residual stress caused by plastic work. Also to improve physical properties of steel, such as tensile strength, heat treatment is conducted. For example, an appropriate way of quenching leads to compressive stress to improve of fatigue strength. To obtain an optical con…
To estimate the strain energy caused by the macroscopic strain gradient, the relationship between strain gradient and its work conjugate higher order stress is formulated. Strain energy required for the macroscopic strain gradient of two-phase composite material was estimated by the Taylor, homogenization, extended Ta…
2011年春、夏、秋季对扎龙国家级自然保护区内的硅藻群落结构进行研究.通过鉴定,共发现硅藻门植物112个分类单位,包括96种16变种,隶属于2纲6目9科32属.通过对硅藻植物的种类组成、聚类分析等方法,对扎龙国家级自然保护区内的硅藻植物分布情况进行初步研究,结果表明,扎龙国家级自然保护区内硅藻植物种类较为丰富,保护区内水体普遍为受轻污染或中度污染状态,个别水域存在富营养化情况,春、夏、秋季节中,秋季的富营养情况较为严重.结合水体的理化指标,通过对扎龙国家级自然保护区水体中硅藻的优势种、指示种的分析,发现该水域喜碱性、半咸水种类及中污带的种类较多,说明保护区水体受到轻微的污染,个别水域出现富营养状态.扎龙国家级自然保护区水体呈中-弱…
Vapor grown carbon nano fiber (VGCF) dispersed Aluminum (Al) composites was prepared by two method; one is obtained by sintering after rolling of the mixed powders of aluminum particles and VGCF, and another is by rolling after sintering of the mixed powders. Relative density, fiber direction and the shape of aluminum…
PDMS (polydimethylsiloxane) can be generated from cyclic oligomers such as D4, cyclotetra(dimethylsiloxane), by the ring opening polymerization process. The reaction is reversible and is catalyzed by a proton or an alkaline ion in either direction. The catalyst ions may remain trapped in the product polymer. Thus on w…
Aerosol deposition method (ADM) is a candidate for nanostructured ceramic coatings and films for advanced applications. Al_2O_3 powder was used as coating material. The deposition of Al_2O_3 powders onto the mullite substrate were carried out using ADM at room temperature. The thickness of the film coated was approxim…
The combination of high-resolution NMR spectroscopy with pressure perturbation, known as variable-pressure NMR spectroscopy or simply high-pressure NMR spectroscopy, is a relatively recent accomplishment, but is now a technique expanding rapidly with high promise in future. The importance of the method is that it allo…
色素増感太陽電池は，酸化チタンナノ粒子の焼結膜を光電極として用いる有機系太陽電池である。電極部材を大気下での印刷で製膜できることが特長であるが，現在，バインダーフリーの水系高粘度ペーストを用いて，常温での塗布と乾燥のみで，良好な半導体膜を製膜することが可能となっている。増感剤として，従来のルテニウム錯体色素や有機色素にかえて，ハロゲン化鉛系ペロブスカイト化合物に置き換えることで，高効率の有機系軽量・薄型太陽電池を，ロール・ツー・ロール印刷で実現するための研究を進めている。
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Behavior of small crack propagation during creep was studied by means of a hollow specimen with a simulated cooling notch, on the basis of non-linear fracture mechanics approach. Through the work special attention is paid to understand (i) microstructural aspects on the propagation behavior of the small creep crack in…
The bending fatigue tests were performed using the micro-cantilever-shaped specimens of AZ31 magnesium alloy fabricated by the focused ion beam (FIB) processing to investigate the effects of the scale and the grain orientation on the fatigue behavior. The configuration of specimen was the rectangular cross section of…
The generalized stacking fault energy (GSFE) curves of the basal and second-pyramidal slips in Magnesium are investigated by first-principles calculations. For the basal slip, the unstable and I_2-type stacking fault energies are decreased with increasing the normal strain perpendicular to the slip plane. In Mg-Y, the…
In order to evaluate the influence of nano-wires formed at interface on delamination strength of SiC films, the nano-wires were formed on high-speed steel substrates by a plasma discharging method, and the SiC film was deposited on the substrate using a sputtering apparatus. The delamination strength was evaluated usi…