Materials Literature
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Magnesium alloys are promising materials for metallic biodegradable stent manufacturing. In order to achieve enhanced coatability and an effective rate of degradation, surface finishing is required for smoothing the surface and removing burrs produced by the heat ablation of the laser-cutting operation used to produce…
Two kinds of typical perovskite catalysts La_<1-x>Sr_xMnO_3 (x=0.2, 0.4) as new catalysts for using in CH_4-NO and CH_4-N_2O reaction is proposed, and the preparation method, characterization, catalytic activity of La_<1-x>Sr_xMnO_3 was investigated. The catalysts powder via sol-gel method was successfully synthesized…
The effect of sonication on the properties of electron beam (EB) irradiated Epoxidised Natural Rubber 50/Polyvinyl Chloride/Carbon Nanotubes (ENR-50/PVC/CNTs) nanocomposites were investigated. CNTs was dissolved and dispersed in 1000 mL of Dioctyl Phthalate (DOP) by using sonication. Sonication time were varied from 1…
In recent years, the study has been attracting which is to develop the Micro Air Vehicle. The MAV is imitated the high ability of small flight insects. The authors' purpose is to develop an MAV modeled a dragonfly because they has high performances in flight. A dragonfly can flap with the flapping motion and the feath…
We propose a method to characterize an undeformed double-layer strand with excess twist moment by considering the deviation from the self-equilibrium configuration where torque is balanced without any external forces. The excess twist gives a measure of the effective torsional rigidity of the strand, determined by the…
One of the advantages of polymer quenching is that it has slower cooling characteristics than water quenching. On the other hand, in polymer quenching, unlike oil quenching and water quenching, cooling effect changes with an increase of the number of quenching times. When slow cooling performance in polymer quenching…
In the event of a severe accident, it is necessary to prevent the release of radioactive materials into the environment due to damage to a containment vessel. It is also important to mitigate the consequences of such a severe accident. If debris (core melt and molten structure) falls down from a reactor vessel onto a…
Although polymer electrolyte fuel cells (PEFCs) are commercially available, there are still many problems that need to be overcome to further improve their performance and increase their usage. The cell performance depends strongly on water management in the PEFC. In this study, two schemes for optimization are propos…
In the present paper, viscoplastic property of epoxy resin reinforced by carbon nanotube (CNT) is investigated by numerical approach based on finite element method (FEM) and homogenization theory. Homogenization theory is employed to estimate the homogenized elastic moduli of the composite material which consists of m…
Cardiovascular disease (CVD) is the leading cause of mortality worldwide and as such carries a huge economic burden.CVDs cover a range of health issues with many of these diseases affecting arteries within the body.Arteries are composed of layers of fibre-reinforced tissue whereby collagen fibres provide structural st…
In order to achieve higher thermal efficiency and decreased emissions, Advanced ultra supercritical (A-USC) steam power plant in which the main steam temperature is raised above 700℃, is developing. Ni-base superalloys have been considered as a candidate material for use in the high-temperature section of an A-USC pla…
Improving the structural and optical properties of tellurite glasses via optimized doping of rare earth ions is an outstanding issue in materials science. Tellurite glasses doped with trivalent europium (Eu3+) are successfully prepared using conventional melt quenching technique. Glasses with chemical composition of (…
Polypropylene (PP)/glass fiber (GF) and PP/GF/calcium carbonate (CaCO_3) composites were fabricated by melt-mixing process using a single screw extruder. Dumbbell shaped specimens were also fabricated from these mixture by injection molding process. Tensile tests were conducted using these specimens, and obtained resu…
The discovery of one-part geopolymers is considered a key event on the evolution of geopolymer technology because emulates one of the most important properties of Portland cement, the just add water concept. This materials are not associated with the known problems of two part geopolymers, namely the use of caustic so…
This paper deals with the analysis of the thermal stress intensity factor for small edge interfacial crack between a bonded dissimilar plates subjected to uniform change of temperature by using the crack tip stress method. In this study, the small edge interface crack problem under thermal stress is solved by superpos…
White etching area may be recoginized at the flaking part of a rolling bearing on which high contact stress of several GPa is applied repeatedly. Up to now, studies of white etching area of a ball has been less than studies of white etching area of inner and outer rings. In this study, as part of the flaking mechanism…
1．はじめに 高温超電導体が発見されてから約30年近くが過ぎた現在，困難であった線材化技術が著しく進歩を遂げ，ようやく高温超電導電力機器の実用化が見えてきた状況にある。高温超電導電力機器として最も実用化に近い機器と思われているのは超電導限流器と超電導送電線であるが，両者と
Magnetic resonance imaging (MRI) is the key technology to investigate anatomy and phyisiology by a non-destructive imaging method. The analysis of molecular structures in nano-scale plays an important role for future nanotechnology. Since the spatial resolution of conventional MRI sytsems is limited to tens of microme…
The authors had proposed a screening method of magnet without magnetization by the measurement of magnetization reversal. To increase the reliability of the screening method, we developed an experimental device. In the device, magnet(Nd-Fe-B) sintered without magnetization was magnetized in small-magnetizing force (≦…
In order to clarify the effects of vacuum on the strength and the time-dependent deformation of Ti nanocolumns, we conducted monotonically-increasing-loading and creep experiments using micro-specimens in laboratory air and vacuum environments. In the monotonically-increasing-loading experiments, critical apparent she…