Materials Literature
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A method has been developed for calculating the interaction pressure between a half-space consisting of a uniform material and a half-space with a spatially periodic material distribution based on the Lennard-Jones potential. The periodic material distribution is two dimensional in the x- and y-directions. The periodi…
If a Loss-of-Coolant-Accident (LOCA) inside the reactor building were to occur, it could generate debris. Debris that could accumulate on the sump screens would increase head loss across the resulting debris bed and sump screen. Furthermore, materials within containment could dissolve or corrode, and result in precipi…
Hydrogen generated during postulated severe accidents in a sodium-cooled fast reactor may be released to the air inside a reactor containment building, resulting in the hydrogen combustion when a specified hydrogen concentration is exceeded. It is important to evaluate the pressure and temperature response of this phe…
The effect of CO_2 reactivity on CH_4 oxidation in fuel-rich O_2/CO_2 combustion where the concentrations of reactants were high was studied by using the reactive molecular dynamics (ReaxFF-MD) simulation. The results showed that the reaction rate of CH_4 in fuel-rich O_2/CO_2 combustion compared to that in air combus…
Ejecta size of a LPSO-type magnesium alloy were examined when aluminum alloy projectiles struck in hypervelocity. The size of ejecta collected from the test chamber was measured. We compared with the difference in ejecta size distribution by changing impact velocity. The results of LPSO-type magnesium alloy were compa…
In the sodium-cooled fast reactors (SFRs), the hypothetical energetic core disruptive accident (HCDA) is one of the major concerns for the safety of the SFRs. If the molten fuel is not fragmented and dispersed, there would be a possibility of recriticality of significant energetic reaction. This means that it is neces…
The crystallization behaviour of Poly(3-hydroxybutyrate) (PHB) induced by two kinds of nucleating agents which are Boron Nitride (BN) and Halloysite nanotubes (HNT) was investigated using Differential Scanning Calorimetry (DSC). PHB composites with 2, 4, 6, 8 wt% of BN and HNT were prepared by melt mixing. Presence of…
While global environment problems are getting more and more serious, hydrogen is regarded as next-generation clean energy, being the key to solve them. One of the barriers for utilizing hydrogen energy is hydrogen embrittlement that frequently takes place in high-strength steels. SUS316L, a stable austenitic stainless…
We investigated spatial distribution of spontaneous polarization in ferroelectric PbTiO_3 nanosprings with helicity using a real-space phase-field modeling based on Landau-Ginzburg theory. Without external loading, polarizations are aligned along the line of nanospring due to dominating depolarizing field. On the othe…
Fatigue crack initiation behavior of shot-peened magnesium alloy AZ31 was investigated. Fatigue tests were conducted using a rotary bending fatigue testing machine. The fatigue specimens were machined from two directions. Their loading directions are parallel and perpendicular to rolling direction. In the finite life…
This paper describes development and/or improvement of analysis method (computer codes) to be used for safety analysis of light water reactors especially on the reactor accident analysis, by referring the contents of AESJ Thermal-Hydraulics Safety Evaluation Fundamental Technology Enhancement Strategy Roadmap that was…
Tato diplomová práce se zabývá syntézou a charakteristikou nových fotochromních spiropyranových barviv. Teoretická část se zabývá obecným popisem, vlastnostmi a trendy v použití spiropyranových barviv. Experimentální část popisuje syntézu série spiropyranových barviv, některé z nich nejsou popsány v literatuře. Strukt…
Long-term reactivity control consists of the compensation of fuel reactivity loss due to the fission products build up in the nuclear fuel. This reactivity loss is balanced by the reactivity gain caused by the burnable absorber (BA) depletion. Introduction of burnable absorber leads to flattening of reactivity during…
This study investigate that the influence of shape of WC on solid particle erosive wear of cast-in insertion cast irons. Shape and size of WC were φ5 × 50, φ8 × 50 and □ 8 × 50mm. The area raid of WC of test surface is 50% at maximum. The test specimens for erosive test were mechanically machined to be sized 50×50×14m…
Visco-elastic property of filled rubber is analyzed by large scale numerical simulations. Combining Coarse Grained Molecular Dynamics and large scale Finite Element Method, molecular scale interphase properties and nano-scale filler structure are considered in the analyses. Effect of filler-matrix interaction and fill…
Mechanical properties of the spheroidal graphite cast iron are dependent on the spheroidized graphite. In the field of casting, rare earth (RE) is used in a spherical shape of the graphite. However, domestic production of RE is small, I rely on imports. Therefore, reduction of the RE elements is an issue. In this expe…
This study was carried out to establish the electron beam welding process for a nuclear fuel plate assembly fabrication. A preliminary investigation for plate fuel fabrication was conducted with a consideration of weld performance using AA6061-T6 aluminum alloy made by the EBW (Electron Beam Welding) process. The opti…
In this research work, we investigated the dielectric constant of pure and carbonated polymers using the impedance method. In carrying out the research, low density polyethylene (LDPE) and metallocene polyethylene (MPE) were used as the polymers. The main difference between LDPE and MPE is that low density polyethylen…
In order to improve thermal efficiency of land-based gas turbine, increase of turbine inlet temperature is known to be very effective. Thus, thermal barrier coatings (TBCs) are key technology to protect the blade metal. It is important to develop damage assessment technology for TBC maintenance, in addition to develop…
When a single bubble goes up in liquid, a bubble moves three-dimensionally and meanderingly. Its trajectory changes from straight to straight by zigzag and spiral as the diameter of bubble increases. But the detail of bubble's behavior has not been clear yet because a bubble shape shows a very complex change. It was s…