Materials Literature
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Recent years, the drug delivery systems (DDS) require multi-functionality and high functionality. In this study, we synthesized a multifunctional DDS composed of magnetite nanoparticles core and mesoporous silica shell (Fe_3O_4@mSiO_2) for magnetic resonance imaging and hyperthermia. We evaluated the magnetic characte…
Thin films of functional materials are of great importance to building future technologies. One such promising material, that is the focus of this research, is Yttrium-Iron-Oxide (YFe_2O_4). What makes this material special is its optical and electrical properties, in particular how the thin films respond to electrica…
海洋島起源の石灰石鉱床は炭酸カルシウムの純度が高いことを特徴とするが，場所によりリンが多く含まれることが知られており，そのような石灰石は鉄鋼・カーバイド用原料としては不向きである．合理的な鉱山開発のためにはリンの偏在の実態を把握することが重要と考え，秋吉帯の石炭紀–ペルム紀の海洋島起源の石灰岩について年代・堆積環境ごとにリン含有量を測定した．その結果，礁中核部ではビゼーアン期，サープコビアン期及びグゼリアン期の石灰岩に比べてバシキーリアン期及びモスコビアン期の石灰岩にリン含有量が高いものがしばしばみられること，背礁ではそれらの年代でもリン含有量が低いことが分かった．また，リン含有量は石灰岩中に二次的に沈積するとされる鉄やアルミニウ…
Although carbon fiber reinforced thermoplastic polymers (CFRTPs) for aerospace structural materials have been developed to improve the productivity with cost reduction for mass production, it is serious problem of strength deterioration during solidification process. In order to improve the resistance to pull out fibe…
Graphene-like two-dimensional layered materials such as transition metal dichalcogenides are prospective as nanoelectronic and nanophotonic materials. Among transition metal dichalcogenides, molybdenum disulfide MoS_2 is especially attractive because they are direct bandgap semiconductors; in addition to MoS_2, molybd…
Gold nanoparticles in aqueous dispersion were synthesized on a glass microfluidic device using the liquid-phase reduction method. The device with Y type microchannel, which is 200 μm in width and 80 μm in depth, was fabricated using a combination process of a micropowder blasting and a glass fusion bonding. Tetrachlor…
Using two different types of ionomers which are composed of perfluorosulfonic acid (PFSA) and hydrocarbon (HC), we constructed systems of the ionomers on Pt catalyst surface, and investigated water content dependence on oxygen permeability in the ionomers using molecular dynamics simulations. We have found that the ox…
The Molten Core Concrete Interaction (MCCI) is one of the most severe incidents in nuclear power plants. This leads to the leak of radioactive material from the power plant. On March 11^ , 2011, it was very concerned that how depth is the concrete erosion formed by the accident in the Fukushima Daiichi Nuclear Power P…
To clearify the creep crack propagation properties of gold (Au) submicron-films deposited by magnetron sputtering, creep experiments and creep crack propagation experiments for 260 nm〜400 nm-thick film specimens were conducted. In all specimens, crack growth rate decelerated at first, and then the creep crack stably p…
Carbon dioxide (CO_2) is one of the main substances linked to greenhouse effect, and its emission should be reduced. In this study, a CO_2 reduction treatment using an adsorbent and a nonthermal plasma flow is investigated. This treatment comprises a physical adsorption process and nitrogen (N_2) plasma reduction proc…
Evaluation of human thermal comfort needs to consider the thermal effect of actual clothing which has wrinkle on its surface. However, it is quite difficult to calculate the geometrical modeling of clothing shape because it requires huge number of meshes in order to simulate the complicated flow behavior on and in the…
Electro adhesive gel (EAG) shows a unique characteristic changing its surface adhesive property according to the applied electric field, which is useful for fixing devices and mechanical brakes. However, the individual difference of EAG caused by the production process has been still problems, such as instability of a…
The objective of this paper is to assess the pressure capacity of the containment in the ultimate limit state at which the structural integrity is retained. For estimating the pressure capacity of the containment structure by deterministic structural simulation with the aid of computer simulation, the static nonlinear…
For the evaluation of reactor pressure vessel (RPV) lower head rupture probably had occurred during the severe accidents in Fukushima, the thermal-hydraulics / mechanical coupling analyses are conducted in JAEA. The mechanical analyses of the RPV need to treat multi-axial deformation of the materials, and in this case…
We investigated the nature of the interactions between I1-type stacking faults (SF) and non-basal dislocations, which are suggested as the important deformation mode to improve the formability without decreasing the strength in Mg-Y alloys. The atomic models of pure Mg including the I1-SF were deformed using molecular…
In this study, we controlled tilted angle or AlN c-axis in the aim of high performance AlN-based energy harvester (VEHs). Tilt-angle of the c-axis of the AlN thin films was adjusted by changing growth temperature from 420℃ to 650℃. The results were confirm by X-ray diffractromety equipped with two dimensional detector…
The modular high temperature gas-cooled reactor could realize higher power and lower capital cost by combining multiple modular reactor system with a large capacity steam turbine unit. The HTR-PM plant based on dual-module reactors has been under construction in China. Meanwhile, another multiple module reactor system…
The decommissioning of a nuclear facility is a long term project, handling information which begins from the design, construction and operation. Moreover, the decommissioning project is likely to be extended because of the lack of the waste disposal site especially in Japan. In this situation, because the transfer of…
In this study, we investigated the relationship between microstructural change and the evolutions of two nonlinear acoustic characterizations, resonant frequency shift and other three-wave mixing, with electromagnetic acoustic resonance (EMAR) throughout the creep life in welded joint for high Cr ferritic heat resisti…
This thesis reports the synthesis and characterisation of several layered pnictides, chalcogenides, and oxychalcogenides, with an emphasis on materials that exhibit high temperature superconductivity. High and low temperature techniques have been used to synthesise new materials and modify their properties. The majori…