A5080075443- Rheology and Fluid Dynamics Studies
- Microstructure and Mechanical Properties of Steels
- Hydrogen embrittlement and corrosion behaviors in metals
- Surfactants and Colloidal Systems
- Fluid Dynamics and Turbulent Flows
- Fluid Dynamics and Vibration Analysis
- Heat Transfer Mechanisms
- Non-Destructive Testing Techniques
- Phase Change Materials Research
- Welding Techniques and Residual Stresses
- Nuclear Materials and Properties
- Hydrogen Storage and Materials
- Nuclear Physics and Applications
- Heat Transfer and Optimization
- Adsorption and Cooling Systems
- Granular flow and fluidized beds
- Coal Combustion and Slurry Processing
- Corrosion Behavior and Inhibition
- Fluid Dynamics and Mixing
- Metal and Thin Film Mechanics
- Engineering Applied Research
- Superconducting Materials and Applications
- Fatigue and fracture mechanics
- Microfluidic and Capillary Electrophoresis Applications
- Advanced Surface Polishing Techniques
Kobe University
2015-2024
Kyoto University
1988-2022
Japan Atomic Energy Agency
2012-2021
University of California, Berkeley
2021
Sophia University
2010-2019
Kanazawa University
1996-2018
Advanced Science Research Center
2004-2018
Tokyo Gas (Japan)
2016
Network Group (Czechia)
2015
Mitsubishi Heavy Industries (Japan)
2012
Hydrogen behavior and hydrogen-enhanced lattice defect formation under elastic stress of tempered martensitic steel were clarified with respect to dislocations vacancies by thermal desorption analysis (TDA) using hydrogen as a probe defects positron microanalyzer (PPMA). The relationship between embrittlement associated was also investigated. amount increased gradually increasing time applied during charging. specimen fractured in the presence macroscopically showed brittle fracture without...
It is uncertain which β4-galactosyltransferase (β4GalT; gene name, B4galt), β4GalT-5 and/or β4GalT-6, responsible for the production of lactosylceramide (LacCer) synthase, functions in initial step ganglioside biosynthesis. Here, we generated conditional B4galt5 knockout (B4galt5 cKO) mice, using Nestin-Cre and crossed these with B4galt6 KO mice to generate 6 double (DKO) central nervous system (CNS). LacCer synthase activity major brain gangliosides were completely absent homogenates from...
A conventional strain rate technique (CSRT) to evaluate the delayed fracture characteristics of high strength steels has been proposed. The critical "maximum stress—diffusible hydrogen concentration" at initiation point near notch tip is thought be a material constant, which was originally demonstrated using SSRT (slow technique) test method. method takes hours complete and uses special machine, causes difficulty complication. Therefore, simple technique, CSRT for investigated. crosshead...
Hydrogen gas is generated by the electrolysis of liquid ammonia which has high hydrogen capacity 17.8 mass%. The metal amides are used as supporting electrolytes to dissolve amide ion in ammonia. results presented here indicate that promising an energy medium for storage and generation.
This study experimentally observes the flow regimes of polyethylene oxide solutions in continuous, abrupt contraction–expansion microchannels. In dilute (0.5 × 10−3–1.5 10−3 wt. %), effects rate, concentration, and cavity length on characteristics contraction expansion parts each are analyzed, including quantified calculations normalized vortex lengths extension rates. The results indicate that polymer memory scission affect transitions. Memory enhance growth weakens flow, these occur...
The hydrogen desorption behavior of pure iron with a body-centered-cubic (BCC) lattice and Inconel 625 face-centered-cubic (FCC) was examined during tensile deformation using quadrupole mass spectrometer in vacuum chamber integrated testing machine. Hydrogen water continuously detected simultaneously under the application load strain to specimens. promoted by can be found deducting both fragment dissociated from H2O H2 desorbed unloading total amount hydrogen-charged specimens deformation....
In this paper, a solar water heater using supercritical carbon dioxide as working fluid is proposed and experimentally studied. For dioxide, small change in temperature or pressure can result large density, especially the state close to critical point. Thus, natural convective flow of be easily induced by heating cooling. Such absorbs transports heat collector tubes. Motivated above idea, an experimental setup was designed, tested. The obtained results show that well induced, 1900 Reynolds...
This paper presents the correlation between difference of dispersion state particles such as LiCoO2 and acetylene black in slurries electrochemical behavior. Three different preparation processes were applied to achieve slurries, thus obtained are characterized by rheological measurement. It is found that process with highly loaded slurry or under high shear flow reduces elastic moduli their combination achieved most dispersed among investigated. X-ray computed tomography unveiled electrodes...
The characteristics of a new piezoelectric linear step locomotive mechanism for an in-pipe micro inspection machine are described. machine, with diameter 5.5 mm and weight 1 g, moves in not only straight but curved pipes. is composed mainly four units; shell-body which made thin plated metal 60 /spl mu/m thickness, two eddy current sensors detect the cracks wall, radiator. three parts; clamping members elastically contact pipe wall to hold one stacked PZT actuator mass block. walking speed...
The delayed fracture characteristics of V-bearing steel were evaluated using conventional strain rate test (CSRT) and the hydrogen absorption desorption behaviors studied with specimens hydrogen-charged then exposed to air 30°C for up 2.5 months. CSRT was carried out at two sites, nearly same resistance obtained steel. appearance changed from quasicleavage intergranular increasing content. content boundary between appearances approximately 4 mass ppm. introduced into composed a diffusible...
In this study, the effects of polymer flexibility and entanglement on elastic instability were investigated by observing sodium hyaluronate (hyaluronic acid salt, Na-HA) solution in planar abrupt contraction-expansion microchannels. As rigidity Na-HA depends ionic strength a solvent, was dissolved water phosphate buffered saline with concentrations from 0.15 wt. % to 0.45 %. The rheological properties measured analyzed detect overlap concentrations. flow regimes solutions several channels...
The effects of the crosshead speed, hydrogen content and temperature on fracture strength surface morphology were investigated using a tempered martensitic steel containing 1.67 mass% Si (H-Si) one 0.21 (L-Si). When L-Si specimens charged with small amount hydrogen, surfaces showed transition from quasi-cleavage (QC) to intergranular-like (IG-like) intergranular (IG) at room temperature. In contrast, when H-Si QC IG-like This in can be explained by magnitude relationship between...
Detecting the flow regimes of Newtonian turbulence (NT), elasto-inertial filament (EIF), (EIT), and maximum drag reduction (MDR) polymer solution their transition has been a hot topic in last decade. We attempted to detect NT, EIF, EIT, MDR by visualizing vortex shedding downstream an array cylinders that was inserted perpendicular polymer-doped two-dimensional (2D) flow. Since polymers are stretched at cylinders, consequent is affected viscoelasticity. The characterized based on Weissenberg...