Materials Literature
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The results of investigation of phase composition and elements of morphology of nano-sized Ni-Cu powders obtained by reduction from aqua salts solutions are presented. The methods of investigation are: X-ray diffraction and small-angle X-ray scattering. The influence of the nano-sise factor on reciprocal solution of m…
This paper describes some general methodological aspects of the assessment of the damage to human life and health caused by a hypothetical nuclear accident at the nuclear power plant (NPP). Probability estimation of death (due to cancer and non-cancer effects of radiation injury), disability and incapacity of individu…
Aerodynamic pressure pulsation generated by rotating fan blades was measured using a basic experimental device consisting of fan blades, a motor, and pressure gauges. The motor was installed on a high-stiffness block via load cells and the motor reaction forces were measured by load cells. On the other hand the aerody…
Plastic film is often passed through roll-to-roll manufacturing processes such as coating, printing and slitting to convert to industrial products. The film is made into wound roll on the final stage of the process to ease handling and storage. And then it is usually transported and heat-treated under the various temp…
This paper investigated the influence of chemical damage of polymer electrolyte membrane (Nafion^[○!R]) on fracture strength in Polymer Electrolyte Fuel Cell. Nafion^[○!R] NR211 was damaged for 24 h by using a Fenton's accelerated aging experiment. The fracture strength of Nafion^[○!R] was evaluated by essential work…
In this research we use uncoupled analysis to evaluate the impact resistance of multi-layer coatings. We conduct high strain-rate simulation by ANSYS. Then the results of stress and strain are in put to damage analysis program which employs the elasto-viscoplastic damage constitutive equation based on continuum damage…
Dielectric elastomers (DEs) are a new and promising transducer technology and are often referred to as ‘artificial muscles’, due to their ability to undergo large deformations when stimulated by electric fields. DEs consist of a soft and thin elastomeric film sandwiched between compliant electrodes, thereby forming a…
FRPs are widely used in many engineering fields due to their high specific stiffness and specific strength. Nanofibers have 1-1000 nm in diameter and their lengths are 100 times more than the fiber diameters. The nanofibers have superior properties such as a high specific surface area, a nano sized effect and a supram…
Gegenstand der dargestellten Arbeit war die Entwicklung eines neuen Beschichtungswerkstoffs für den Verschleiß- und Korrosionsschutz von Stahlkomponenten insbesondere für Anwendungen in der Ölbohrtechnik. Die Arbeit konzentrierte sich hierbei auf eine kostengünstige Beschichtungslösung für großvolumige Komponenten, mi…
Reactor Boron and Water Makeup System (REA) is one of the most important auxiliary systems of PWR nuclear power plant, whose normal operating modes involve auto-filling, manual-filling, rapid dilution, slow-footed dilution and boronization. The realtime simulation on REA fluid network with high accuracy can be used to…
We studied a melting phenomenon of a paraffin plate and a flow into a hole in an acryl block during a model rilling groove process. Changes of temperature and geometry of the paraffin plate were experimentally measured for three heating methods: heating the bottom surface of the acryl block with a hotplate, heating th…
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…