Materials Literature
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One of the candidate materials for turbine blade is proposed as continuous fiber reinforced self-healing ceramic composites (shFRC). The shFRCs consist of three components, which are oxide fiber bundle, oxide matrix and self-healing agent interlayer. As the self-healing is generated at only the interlayer, it is neces…
According to a guideline by the regulatory body, materials, which irradiated by neutron less than 6.25μSv/h, can be treated as "Non-Radioactive Waste (NR)" (Advisory Committee 2007). And we call a boundary of radioactive waste and Non-radioactive waste "NR Boundary". We improved an estimation procedure of NR boundary.…
We proposed new evaluation method for crack tip fracture toughness in ceramic materials by a combination of Vickers indentation and finite element method. We paid attention to the smallest applied load of the radial crack which occurs to material surface by a Vickers indentation. The crack tip fracture toughness was d…
We describe the result of the electrical conductivity measurement of single crystalline aluminum nanowires. These nanowires are fabricated by simply heating the Al samples in air. The growth mechanism is stress-induced migration. Four electrodes were patterned on nanowires by the photolithographic technique and we obt…
Room temperature ionic liquids are molten salts at ambient temperature. This thesis is concerned with the structure of room temperature ionic liquids both in the bulk and in confinement. A particular theme is the rich statistical physics of such systems, which is primarily due to strong Coulomb correlations. We begin…
This paper describes NO_X reduction for a diesel engine using exhaust gas component recirculation (EGCR). EGCR is the aftertreatment technology for NO_X reduction by intake of NO_X extracted from exhaust gas to diesel engine. In this experiment, NO_X aftertreatment system equipped with heat exchanger and absorbent by…
We examined the stress concentration that would occur at grain boundary triple lines during deformation in two copper tricrystals with [011] tilt boundaries; one was a symmetrical tricrystal with respect to the loading axis and the other was an anti-symmetrical one. In principle, the finite element method can provide…
Previous research on experimental ferritic steel with high Mo content showed that Mo increases the resistance to naphthenic corrosion and sulfur complexes. However, Mo content above 5 wt% favored the formation of deleterious phases and reduced the toughness of the steel. To improve the toughness of these alloys and ke…
This paper describes that strengthening of fiber-reinforced self-healing ceramics (shFRC) is achieved by decreasing the defect size in fiber bundle and employing high strength interlayer. The shFRC was proposed as one of the candidate materials for turbine blade and consists of three components, which are oxide fiber…
石炭焚きボイラでのバイオマス混焼排ガスに対する，V2O5-WO3/TiO2系脱硝触媒の劣化機構を明らかにするために，バイオマス燃焼灰およびKCl，CaCl2を用いて強制劣化試験を行った。バイオマス燃焼灰の水スラリーによる触媒の湿式含浸試験の結果，スラリー中の灰の濃度の増加に伴い脱硝性能の低下が大きくなった。液体の水が共存する環境下では，バイオマス燃焼灰からアルカリ金属成分が触媒へ移動することで，活性点を被毒し化学的劣化を生じる。KCl エアロゾル曝露試験の場合，K 成分は触媒表面から内部に拡散しながら，化学的劣化を経時的に生じる。SO2共存下でのCaCl2エアロゾル曝露試験では，CaSO4が触媒表面近傍で生成し，触媒表面の細孔を閉…
To develop precision mechanical systems, a molecular level understanding of nanometer-thick polar liquid lubricant films under confined shear between two solid surfaces is essential. To obtain such an understanding, we first developed a coarse-grained (CG) molecular model of polar perfluoropolyether (PFPE). This model…
As the important lessons learned from Fukushima-nuclear power plant accident, countermeasures and management became essential against severe accident and excessive earthquake conditions. To estimate adequate scenario of accidents, failure modes of nuclear components under severe accidents and earthquakes were investig…
The aim of this study is to evaluate structure changes due to creep damage of mod. 9Cr-1Mo steels by incremental permeability method. For the purpose, magnetic incremental permeability is measured in thermal aging specimens in which precipitations change and creep specimens in which both precipitations and dislocation…
Japan has the special feature that there are a lot of natural disasters compared with other country. The volcanic explosion at Mt. Fuji has been paid attention recently. If aerosol-like volcanic ash is inhaled from the air intake in those land-based gas turbines, all generators would be stopped and then a blackout wou…
The activity of cytoplasmic malate dehydrogenase (cMDH)is perturbed by solution crowding. Since specific movements of a surface loop in the region of the enzyme's active site have been implicated in the activity of this enzyme, it seems likely that flexibility of this and other portions of cMDH are important for kinet…
System analysis of bubble oscillations in an elastic tube is important for medical applications using nano/microbubbles such as ultrasonic contrast agents and high intensity focused ultrasound. In order to investigate inuences of the bubble-bubble interaction on the natural frequencies of two bubbles, a simple bubble…
Results of theoretical investigations are presented, forming of class structure of electromechanics transformers of energy is shown, the generation of the field models on the basis of principles of the object-oriented analysis is considered.
Hypervelocity impact experiments were performed on polycarbonate plates to investigate the penetrating dynamics of hypervelocity objects. The penetration behavior was observed using an ultra-high-speed video camera. The penetrating motion of projectile is analyzed by various penetration models. The penetration behavio…
Dendrimers are a class of polymers with a highly branched, three-dimensional architecture comprised of an initiator core, several interior layers of repeating units, and multiple active surface terminal groups. Dendrimers have been recognized as the most versatile compositionally and structurally controlled nanoscale…
Ubiquitous light elements (ULEs) like oxygen (O) and nitrogen (N) are the promising additive elements to achieve the high specific strength and cost-effectiveness of powder metallurgy (PM) titanium (Ti) materials. The ULEs are employed as useful reinforcements instead of the conventional alloying elements of expensive…