Materials Literature
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Island-shaped self-assembled monolayer (SAM) of octadecyl-trichlorosilane was repeatedly slid by using the atomic force microscope (AFM) as a model for localized adsorption films in practical boundary friction conditions. In order to clarify the deformation and fracture behaviors of them, the shape profile and frictio…
Residual seismic performance has to be evaluated in tall buildings and important structures, such as nuclear power plant, after striking earthquakes. Because of lowering brittleness of structural materials, added plastic deformation is important material characteristic to be measured, although most non-destructive tes…
The purpose of the absorber is to reduce the energy propagated to the object when an impact occurs. However, the optimal size and material of the absorber depends on impact condition. In addition, research is not enough for the case that the deformation of the absorber is in huge strain rate. Impacting the fragment to…
Metal oxides are commonly used as oxidation catalysts. The present work investigates the effects of treatment with 0.5 and 1.0 N H 2 SO 4 on the surface characteristics of three oxides, CoO, MnO 2 and ZnO. The materials along with the parent oxides were characterized by powder XRD, FT-IR and SEM measurements. BET surf…
Stent placement for stenosis has possibility of restenosis by intimal excessive proliferation with denudation of intima by stent placement. The goal of stent treatment is to cover the layer of endothelial cells (EC) on and around the stent. Intimal excessive proliferation is not occurred in the area with ECs. So, cell…
Ignition and combustion characteristics vary depending on the combination of fuels in dual fuel HCCI. In this study, the chemical interactions of two fuels with different reactivity were investigated. Experiments were performed on a single cylinder research engine fueled with different fuel combinations of methane, to…
Many pipes branch off from a main pipe in industrial plants. Hot water penetrates into the branch pipe with a cavity flow induced by the main flow when fluid temperature in the main pipe is higher than that in the branch pipe. The penetration causes thermal stratification in the branch pipe. The cavity flow causes a s…
The present paper describes failure modes of injection molded PEEK gear. PEEK has good material properties such as high strength, high wear and heat resistance. And PEEK is expected to be applied to gear. Therefore, in order to estimate load capacity of PEEK gears, operating tests were performed under 1000, 3000, 5000…
Characteristics of oil stain removal from a pipe inner wall by micro-bubble flows were experimentally investigated. Silicone oil was used as the stain material which was adhered to the pipe inner wall. Fluorescent dye was added to the silicone oil in order to measure the oil removal process by fluorescence method. The…
Molecular dynamics (MD) study on copper sulfide (Cu_2S) crystal which is subjected to sliding condition is performed. The hexagonal crystal structure of Cu_2S is determined by first-principle calculation, first. Values on the optimized structure are adopted to the construction the potential function which includes thr…
In this study, high-speed tensile testing for notched specimen is conducted to investigate the impact property of Polydimethylsiloxane copolymerized Polycarbonate (PDMS-PC) compared with Polycarbonate (PC). Depending on the test temperature and tensile speed, brittle or ductile fractures are observed for PC. However,…
An experimental study has been conducted to obtain thermal characteristics of the rotational type magnetic heat pump with two different layouts of magnetocaloric materials. These layouts are arranged with two different materials. Gd and Gd_<0.89>Dy_<0.11> which show large temperature change comparatively through low t…
The paper presents numerical and experimental research on hydroelastic and elastic shell vibrations. It suggests methods for calculating natural vibration frequencies of constructions placed in the vacuum as well as their vibration frequencies while interacting with water. Testing a cylinder reservoir and a conical sh…
In the present work, a passive decay heat removal system for light water reactors (LWRs) based on a new concept is studied referring to an air cooling system (ACS) of the fast breeder reactor Monju. The present study will contribute to the reduction of severe accident risks of nuclear power plants. In this system, a b…
Plasma electrolytic oxidation (PEO) is a surface treatment technology using anodic oxidation. Recently, PEO coatings have been developed industrially, mainly for application to surface treatment of light metals. This study was conducted to elucidate the effects of metal oxyacid salts such as AlO2−, SiO32− and [Zr(CO3)…
In recent years, clean energy is desired because of environmental issues such as global warming and depletion of fossil fuels. As a way to solve these problems, fuel cell vehicles have attracted attention because the fuel of the fuel cell vehicle is hydrogen that is one of the clean energy. Currently, the 6061 aluminu…
Raman scattering spectroscopy is one of the method to detect vibrational modes of molecules. These detected modes are applied to determine the chemical bonds and crystal orientations. For over years, surface enhanced Raman scattering (SERS) spectroscopy with strong electromagnetic enhancement has been studied to incre…
Crystal chemistry of molybdates and titanates is of special interest due to the appearance of these compounds in the nuclear fuel cycle. In the present study, several synthetic and natural molybdates and titanates were investigated by means of X-ray diff raction singlecrystal structure analysis. Five novel alkali moly…
The elasto-viscoplastic constitutive equation based on the concept of continuum damage mechanics was formulated for the niobium alloy (C103) which was used as a thruster chamber material in a satellite. Fatigue life analysis based on damage mechanics was conducted to simulate the experimental data obtained by the stra…
Hobbing is an efficient method to manufacture high quality gear. It is difficult to understand the hobbing mechanism. So there were some researches of hob cutter wear using a flytool. However in these researches, V shape grove were produced which is not an actual gear shape. In this study, new experimental method is p…