Materials Literature
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The influence of loading direction on cyclic deformation behavior of rolled AZ31 magnesium alloy (average grain size: approximately 40μm) was investigated. Cyclic tensile and compressive loading-unloading tests were carried out using cylindrical smooth specimens. Pseudoelastic behaviors were observed in tensile and co…
We propose a distorted optical waveguide around a microsphere to mimic curved spacetimes caused by the “gravitational fields”. Gravitational lensing effects analogues are experimentally demonstrated and this can be used to prospective light harvesting.
This study focuses on the self-crack-healing process of Al_2O_3/30 vol.% SiC composites. Specimens with cracks were subjected to thermal treatment at 1000℃ and 1200℃, their strengths were measured by a three-point bending test, and nano/micro structural analysis of crack-healed zone was performed using scanning electr…
A flame combustion method enables the synthesis of diamond using acetylene-oxygen in ambient atmosphere. It has various advantages over other methods. In this method, during cooling, most diamond films delaminate as a result of thermal stress. We previously synthesized diamond films on a Mo substrate surface by the fl…
Thermoelectric generation units have been produced using cascade modules of oxide and Bi_2Te_3 devices. Power density of the cascade module is as high as 7.8 kW/m^2 at 1000℃of the heat source temperature and higher than that of Bi_2Te_3 and oxide single modules at temperatures higher than 800℃. A thermoelectric unit c…
In order to clarify the mechanism of core meltdown which occurred in the Fukushima Dai-ichi nuclear power plant, the details of the melting behavior of fuel elements, such as fuel rods and control rods, must be clarified. However, it is not easy to obtain these data experimentally. Then, to clarify the melting behavio…
Macro- and micro-structure and hardness of hardened layer of induction hardened SUJ2 and SCM435 steel gears were measured, and profiles of hardened layers and effective hardened depths were obtained. Bending fatigue tests of induction hardened SUJ2 and SCM435 steel gears were carried out and S-N curves and bending fat…
Identify of vibration damping mechanisms of
Effect of surface profile processed by micro slurry -jet erosion
Effect of aging on activity of twinning in magnesium alloy AZ91 was investigated. The experimental results showed that stress-strain curves during reversed loadings were different between tension after compression and compression after compression. The difference in stress-strain behavior decreased with the increase i…
Shape Memory Gel (SMG) is one of the most interesting unique soft and wet materials. Its shape memory function is due to the crystalline feature of alkyl side chain integrated into main polymer chain. The side chain switches its state between amorphous phase and crystalline phase depending on temperature. The elastic…
Cerium phosphate was synthesized by co-precipitation method ÂÂ the base salt. This base salt was doped with zinc having different molarities. Their structure and morphologywere characterized byX- ray diffraction (XRD), Fourier transform infra red spectroscopy (FTIR), scanning electron microscopy (SEM) and transmissio…
The wear performance between Partially Stabilized Zirconia (PSZ) plate and silicon nitride ball under dry conditions was investigated. The wear durability of PSZ with shot peening was higher than that of PSZ without shot peening in the sliding wear test under low Hertzian contact pressure. Due to shot peening, the tra…
Metal nanoparticles decorated carbon nanotubes (CNTs) have been thoroughly investigated as electrode of fuel cells and chemical and biological sensors. In these applications, the size and the density of nanoparticles are very important, because the catalyst activation depends on the particle size and the density. Rece…
以固态氧化物为原料,采用固态合成工艺制备Pb（Zn1/3 Nb2/3）O3-Pb（Ni1/3 Nb2/3）O3-Pb （ZrTi）O3（PZN-PNN-PZT）压电陶瓷,并研究了锆钛比（r（Zr） /r（Ti））、Ba2＋的A位取代及Ba2＋、La3＋的A位复合取代对压电陶瓷电性能的影响.结果表明,PZN-PNN-PZT压电陶瓷在r（Zr）/r（Ti）=1.03下,进行Ba2＋,La3＋的A位复合取代后,即式子在Pb0.92Ba0.04La0.04 （Ni1/3 Nb2/3）y（Zn1/3Nb2/3）zZrm TinO3时压电性能最佳,其介电常数eT33/e0=5 657,压电常数d33=709 pC/N,机电耦合系数kp=0.6…
We have developed a novel magnetic micropillar substrate made of poly(dimethylsiloxane) to apply the mechanical stimulation to individual cell adhesion sites of cells, and to measure associated internal tension of cells. We have successfully embedded enough amount of iron particles into the micropillars and controlled…
磁気ビーズ法(Magnetic Beads Method:MBM)による誘導磁場解析精度の向上を目的として、新たなグリーン関数を提案する。MBMはメッシュレスの動磁場解析手法であるから、機構との連成解析が可能となった。本論文では、新たに発見したゲージ変換からグリーン関数を導出し、誘導磁場解析精度の向上を達成した。また、計算量の低減を期待して、ビーズの誘導磁場解法を陽解法へ改良し、4.09倍の計算高速化を実現した。導体球の誘導磁場解析を実施した結果、導体表面の磁界振幅の最も大きい位置において、厳密解との振幅誤差は3.33[%]、位相誤差は1.65[%]となった。
Agglomerated and clushed TiO_2 powders were sprayed by cold spray equipment on an Aluminum (JIS A-1100) substrate. DYMET 412k manufactured by OSPC was used as cold spray equipment and the process gas was compressed air. Sprayed specimen were observed and analyzed by FE-EPMA. Gas decomposition test was carried out usin…
The evaluation of magnetic properties of fatigue-damaged and fatigue-cracked electromagnetic steel sheets were investigated. In fatigue tests, plastic deformation area around notch or crack tip was observed. In macro-magnetic measurement using B-H analyzer, magnetic properties of fatigue-damaged specimens were deterio…
Fundamental understanding of atmospheric corrosion mechanisms requires an in-depth understanding on the dynamic interaction between corrosive constituents and metal/alloy surfaces. This doctoral study comprises field and laboratory investigations that assess atmospheric corrosion and metal release processes for two di…