Search

第54回流体力学講演会/第40回航空宇宙数値シミュレーション技術シンポジウム (2022年6月29日-7月1日. いわて県民情報交流センター(アイーナ)), 盛岡市, 岩手, The 54th Fluid Dynamics Conference / the 40th Aerospace Numerical Simulation Symposium (June 29 - July 1, 2022. Iwate Citizen Information Exchange Center (Aiina)), Morioka, Iwate, Japan, Japan Aerospace Exploration Agency has been investigating scramjet engines in Kakuda Space Center using RamJet Engine Test Facility and others. The engine tested at the flight condition of Mach 6 showed very steep fuel distribution. The fuel injected from the vertical injector on the side wall stays near the side wall and the top wall along the engine. The steep fuel distribution is an obstacle for the engine performance completion. In order to solve the problem, the authors are focusing the influence of cowl and strut shock waves on the fuel distribution. In this paper the authors describe the effect of cowl shock wave on the fluid transport and on the OH product in the strut wake. It is found that the steep fuel distribution can be reduced by means of strut tail part design and that the OH product is more obtained in the boat-tail strut configuration., 形態: 図版あり, Physical characteristics: Original contains illustrations, 資料番号: AA2230023022, レポート番号: JAXA-SP-22-007

第53回流体力学講演会/第39回航空宇宙数値シミュレーション技術シンポジウム (2021年6月30日-7月2日. 日本航空宇宙学会 : 宇宙航空研究開発機構(JAXA)オンライン会議), The 53rd Fluid Dynamics Conference / the 39th Aerospace Numerical Simulation Symposium (June 30 - July 2, 2021. The Japan Society for Aeronautical and Space Sciences : Japan Aerospace Exploration Agency (JAXA), Online meeting), Japan Aerospace Exploration Agency has been investigating scramjet engines in Kakuda Space Center using RamJet Engine Test Facility and others. The engine tested at the flight condition of Mach 6 showed very steep fuel distribution. The fuel injected from the vertical injector on the side wall stays near the side wall and the top wall along the engine. The steep fuel distribution is an obstacle for the engine performance completion. In order to solve the problem, the authors are focusing the influence of cowl and strut shock waves on the fuel distribution. In this paper the authors describe results of combustion calculation to compare with the test result. It is found that a flow separation occurs in the corner of internal flow, and that the separation causes inclined shock wave to promote the combustion., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA2130027017, レポート番号: JAXA-SP-21-008

To investigate the prevalence, associated factors, and inter-eye differences of myopia and astigmatism in an adult Japanese population-based cohort. A total of 4282 participants from the Tohoku Medical Megabank Organization Eye Study (ToMMo Eye Study) underwent comprehensive ocular examinations as well as extensive physiological tests and a lifestyle questionnaire. The spherical equivalent (SE) and cylinder power were obtained as refractive parameters. The age- and gender-stratified prevalences of high myopia (SE < −5D), myopia (SE < −0.5D), hyperopia (SE > 0.5D), astigmatism (cylinder power < −0.5D), and anisometropia (SE difference >1D) were calculated. Multivariable analyses were performed to identify associated factors for refractive error (RE). Distribution and associated factors of the inter-eye difference in RE were also investigated. The age-adjusted prevalence of high myopia, myopia, hyperopia, astigmatism, and anisometropia was 15.9%, 63.5%, 14.7%, 51.1%, and 14.7%, respectively. Both myopia and high myopia were more prevalent in the younger age group, while astigmatism was more prevalent in the older age group. Age, education, blood pressure, intraocular pressure, and corneal thickness are significantly associated with myopic refraction. Age, gender, intraocular pressure, and corneal thickness are correlated with astigmatism. Older age was associated with against-the-rule astigmatism. Older age, myopia, and longer education showed a significant correlation with large inter-eye differences in SERE. This study demonstrated the high prevalence of myopia in young Japanese, which may be caused by a generational shift. This study also confirmed the influence of age and education on both the prevalence and inter-eye differences of RE.

流体力学講演会/航空宇宙数値シミュレーション技術シンポジウム2020オンライン (2020年9月28日-30日. 日本航空宇宙学会 : 宇宙航空研究開発機構(JAXA)オンライン会議), Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2020 Online (September 28-30, 2020. The Japan Society for Aeronautical and Space Sciences : Japan Aerospace Exploration Agency (JAXA), Online meeting), Japan Aerospace Exploration Agency has been investigating scramjet engines in Kakuda Space Center using RamJet Engine Test Facility and another facility. The engine tested at the flight condition of Mach 6 showed very steep fuel distribution. The fuel injected from the vertical injector on the side wall stays near the side wall and the tap wall along the engine. The steep fuel distribution is an obstacle for the engine performance completion. In order to solve the problem, the authors are focusing on the cowl shock wave influence having on the fuel distribution. In this paper the authors describe results of fuel distribution derived from combustion calculation to compare with the test result. Some disagreement is found and considered to be caused by capturing flow separation in the calculation, though the separation promotes fuel mixing and combustion. The mixing process is shown., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA2030013016, レポート番号: JAXA-SP-20-008

In this study, we conducted a questionnaire survey and an interview survey of 17 nurses in order to clarify the work improvement effect and burden of caregivers who use the silhouette watching sensor, which is a nursing robot. As a result, it has become possible to visit the room efficiently by visualizing the medical treatment situation. And It was suggested that there was a work improvement effect such as being able to provide relationships with non-restrained patients, and that the burden of nursing care for nurses was reduced by converting to effective fall prevention measures.

第51回流体力学講演会/第37回航空宇宙数値シミュレーション技術シンポジウム (2019年7月1日-3日. 早稲田大学早稲田キャンパス国際会議場), 新宿区, 東京, 51st Fluid Dynamics Conference / the 37th Aerospace Numerical Simulation Symposium (July 1-3, 2019. International Conference Center, Waseda University), Shinjuku-ku, Tokyo, Japan, Japan Aerospace Exploration Agency has been investigating scramjet engines in Kakuda Space Center using RamJet Engine Test Facility et al. The engine tested at the flight condition of Mach 6 showed very steep fuel distribution. The fuel injected from the vertical injector on the side wall stays near the side wall and the tap wall along the engine. The steep fuel distribution is an obstacle for the engine performance completion. In order to solve the problem, the authors are focusing the influence of cowl shock wave and strut shock wave on the engine flow field to search the engine flow field detail by using CFD. In this paper the authors describe results of consideration on the cause of fuel distribution difference between the calculation and the engine test., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA1930011005, レポート番号: JAXA-SP-19-007