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Imamura, Hiroshi,Hasegawa, Yutaka,Murata, Junsuke,Chihara, Sho,Takezaki, Daisuke,Kamiya, Naotsugu Korean Society for Fluid machinery 2009 International journal of fluid machinery and syste Vol.2 No.3
Since large-scale commercial wind turbine generator systems such as MW-class wind turbines are becoming widely operated, the vibration and distortion of the blade are becoming larger and larger. Therefore the soft structure design instead of the solid-design is one of the important concepts to reduce the structural load and the cost of the wind turbine rotors. The objectives of the study are development of the fluid-structure coupled analysis code and evaluation of soft rotor-blade design to reduce the unsteady structural blade load. In this paper, fluid-structure coupled analysis for the HAWT rotor blade is performed by free wake panel method coupled with hinge-spring blade model for the flapwise blade motion. In the model, the continuous deflection of the rotor blade is represented by flapping angle of the hinge with one degree of freedom. The calculation results are evaluated by comparison with the database of the NREL unsteady aerodynamic experiment. In the analysis the unsteady flapwise moments in yawed inflow conditions are compared for the blades with different flapwise eigen frequencies.
Spin Torque Assisted Magnetization Switching in Thermally Activated Region
Tomohiro Taniguchi,Hiroshi Imamura 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The spin torque assisted magnetization switching in the thermally activated region was theoreticallystudied based on the rate equation. We found the dependence of the switching current on thecurrent pulse duration time to be linear for b = 1 and nonlinear for b = 2. Here, b is the exponentof the current term in the switching rate formula, which has been assumed to be unity while atheory with b = 2 was proposed recently. A comparison of the calculated results with the recentexperiments of Heindl et al. [J. Appl. Phys. 109, 073910 (2011)] indicates b 6= 1.
The Use of Transabdominal Ultrasound in Inflammatory Bowel Disease
Hata Jiro,Imamura Hiroshi 대한영상의학회 2022 Korean Journal of Radiology Vol.23 No.3
Transabdominal ultrasound (TAUS) is useful in all aspects of lesion screening, monitoring activity, or treating/diagnosing any related complications of inflammatory bowel disease. Its ability to screen or diagnose complications is almost the same as that of other methods, such as CT or MRI. Moreover, its noninvasiveness makes it a first-line examination method. A TAUS image depicting ulcerative colitis will show large intestinal wall thickening that is continuous from the rectum, which is mainly due to mucosal layer thickening, while for Crohn’s disease, a TAUS image is characterized by a diversity in the areas affected, distribution, and layer structure. Indicators of activity monitoring include wall thickness, wall structure, and vascular tests that use Doppler ultrasound or contrast agents. While all of these have been reported to be useful, at this time, no single parameter has been established as superior to others; therefore, a comprehensive evaluation of these parameters is justified. In addition, evaluating the elasticity of lesions using elastography is particularly useful for distinguishing between fibrous and inflammatory stenoses. However, the lack of objectivity is the biggest drawback of using ultrasound. Standardizing and popularizing the ultrasound process will be necessary, including scanning methods, equipment settings, and image analysis.
Fundamental Study on Electrostatic Atomization of Biofuel/Water Emulsion
( Chien-hua Fu ),( Osamu Imamura ),( Kazuhiro Akihama ),( Hiroshi Yamasaki ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
This paper reports the experimental investigation of electrostatic atomization of BDF/water emulsion. Biofuel, such as Bio Diesel Fuel (BDF), is expected as the alternate fuel because of its carbon-neutral characteristics. In the process of making the biofuels, biofuels include water and the separation energy cost is relatively high. From this viewpoint, it is expected that the water in the biofuel is utilized in a positive manner. Biofuel and water mixture usually have large electric conductivity in comparison with hydrocarbons and it is possible to control of atomization using the electrostatic energy. In addition, if the droplets and spray are charged, the spray shape and flame pattern could be controlled to enhance the combustion and to reduce the heat loss to the wall. From this background, the paper mainly is focused on the electrostatic atomization of the BDF/water mixture. For the comparison, n-hexadecane is used as a reference fuel. The mixture fraction of water is the parameter of the fuel. To keep the stable mixture, surface active agent was added in the tested fuels. The viscosity of some tested fuel was high and the characteristics of non-Newtonian viscosity were researched prior to atomization experiments. The thin capillary to inject the fuel and wire netting over the capillary are used as electrodes and direct current voltages are applied to the electrodes. The fuel is pushed by the pressurized nitrogen and injected to the air through the capillary. As the results, fraction of water affects the onset of mode change, such as dripping, spindle, cone-jet etc. Droplets diameters and droplets velocity were measured from the video images and the electric charge distribution was discussed to understand the electrostatic atomization.