Search Results 1-20 of 628

  • Urbanization toward a New Century : The Appearance of the 9th Arrondissement of Paris  [in Japanese]

    久末 弥生

    現代社会における都市のイメージは、19世紀に始まる都市化の時代を牽引したフランスの首都パリ、とりわけ19世紀後半から急速な都市化を実現したパリ第9区に、その原点を見いだすことができる。19世紀のパリにおける猛烈な人口増加を背景に、金融、不動産取引、商業、娯楽といった近代都市に不可欠な領域と、文化、芸術というフランスのアイデンティティーを支える領域のいずれにおいても、世界の中心地として繁栄したパリ第 …

    都市経営研究 (1), 1-19, 2021-03

    IR 

  • Superstrata

    Shigemori Masaki

    We give a survey of the present status of the microstate geometries called superstrata. Superstrata are smooth, horizonless solutions of six-dimensional supergravity that represent some of the microst …

    General Relativity and Gravitation 52(5), 51, 2020-05-25

    IR 

  • Influence of Number of Blades on Performance and Flow Field of a Gravitation Vortex Type Water Turbine with a Volute Tank  [in Japanese]

    ANDO Ryota , NISHI Yasuyuki , SUKEMORI Daichi , INAGAKI Terumi

    … <p>A gravitation vortex type water turbine is a water turbine that guides water into a tank and generates power by the gravitational vortex generated in the tank. …

    The Proceedings of the Fluids engineering conference 2020(0), OS07-14, 2020

    J-STAGE 

  • Influence of Flow Rate on Performance and Flow Field of a Gravitation Vortex Type Water Turbine with a Volute Tank  [in Japanese]

    ANDO Ryota , NISHI Yasuyuki , SUKEMORI Daichi , INAGAKI Terumi

    … <p>A gravitation vortex type water turbine is a water turbine which generates power by the gravitational vortex. … We researched effect of flow rate on performance and hydraulic loss of a gravitation vortex type water turbine having a circular tank using loss analysis. … However, effect of flow rate on performance, flow field and hydraulic loss of a gravitation vortex type water turbine having a volute tank has not been elucidated. …

    The Proceedings of Mechanical Engineering Congress, Japan 2020(0), J05126, 2020

    J-STAGE 

  • Unpowered Walking Assistance Device by Using Ingeniously a Gravitational Field  [in Japanese]

    Sano Akihito

    <p></p>

    Journal of the Robotics Society of Japan 38(2), 139-142, 2020

    J-STAGE 

  • A Retrofit Passive Foldable Snow Shoe for A Legged Robot to Walk on Snowfield

    HAKAMADA Go , MIKAMI Sadayoshi

    … To overcome these problems, this paper proposes an automatic retraction and expansion mechanism of wide snow-contacting framings which are passively operated by gravitation. …

    International Journal of Mechanical Engineering and Robotics Research 8(6), 867-872, 2019-11

    IR 

  • Weakly bound molecules as sensors of new gravitylike forces

    Borkowski Mateusz , Buchachenko Alexei A. , Ciuryło Roman , Julienne Paul S. , Yamada Hirotaka , Kikuchi Yuu , Takasu Yosuke , Takahashi Yoshiro

    … Several extensions to the Standard Model of particle physics, including light dark matter candidates and unification theories predict deviations from Newton's law of gravitation. … For macroscopic distances, the inverse-square law of gravitation is well confirmed by astrophysical observations and laboratory experiments. …

    Scientific Reports 9(1), 2019-10-15

    IR 

  • First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole

    The Event Horizon Telescope Collaboration , Sasada Mahito

    We present measurements of the properties of the central radio source in M87 using Event Horizon Telescope data obtained during the 2017 campaign. We develop and fit geometric crescent models (asymmet …

    The Astrophysical Journal Letters 875(1), L6, 2019-04-10

    IR 

  • First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole

    The Event Horizon Telescope Collaboration , Sasada Mahito

    When surrounded by a transparent emission region, black holes are expected to reveal a dark shadow caused by gravitational light bending and photon capture at the event horizon. To image and study thi …

    The Astrophysical Journal Letters 875(1), L1, 2019-04-10

    IR 

  • Influence of Tank Shape on Performance and Flow Field of a Gravitation Vortex Type Water Turbine  [in Japanese]

    SUKEMORI Daichi , NISHI Yasuyuki , INAGAKI Terumi

    … <p>A gravitation vortex type water turbine can generate power with a low head and a small flow rate. …

    The Proceedings of Conference of Kanto Branch 2019.25(0), 19H09, 2019

    J-STAGE 

  • Loss Analysis of Gravitation Vortex Type Water Turbine  [in Japanese]

    SUKEMORI Daichi , NISHI Yasuyuki , SUZUO Ryouta , INAGAKI Terumi

    … A gravitation vortex type water turbine is a water turbine which generates power by the gravitational vortex. … In this study, we analyze the free surface flow of the gravitation vortex type water turbine and propose a loss analysis method based on the analysis result. … By the loss analysis method, the dominant loss of the gravitation vortex type water turbine was found to be the loss in the tank and the loss at the tank outlet. …

    The Proceedings of Ibaraki District Conference 2018.26(0), 318, 2018

    J-STAGE 

  • Instructional Design Based on an Analysis of Learners' Feelings in High School Physics Education  [in Japanese]

    NAKANO Sumiaki

    <p>本研究では, 高等学校における万有引力分野の指導の中で, 生徒が感じている当該分野に対する否定的な印象(ネガティブ感情)を収集・分析し, その結果を踏まえた授業を設計・実践して効果を調べた。授業実践前の意識調査では, 対象集団の約1/4が当該分野に興味を持てていない実態が明らかとなった。また, 当該分野への興味有無に関わらず, 「状態や運動をイメージしにくい」というネガティブ感情 …

    Journal of Research in Science Education 59(1), 139-146, 2018

    J-STAGE 

  • GUP parameter from quantum corrections to the Newtonian potential

    Scardigli Fabio , Lambiase Gaetano , Vagenas Elias C.

    … We just assume General Relativity as theory of Gravitation, and the thermal nature of the GUP corrections to the Hawking spectrum. …

    Physics Letters B (767), 242-246, 2017-04

    IR 

  • Probability of boundary conditions in quantum cosmology

    Suenobu Hiroshi , Nambu Yasusada

    One of the main interest in quantum cosmology is to determine boundary conditions for the wave function of the universe which can predict observational data of our universe. For this purpose, we solve …

    General Relativity and Gravitation (49), 19-19, 2017-02

    IR 

  • EXISTENCE OF UNBOUNDED SOLUTIONS TO A ONE DIMENSIONAL ISENTROPIC PERIODIC FLOW OF A COMPRESSIBLE VISCOUS FLUID WITH SELF-GRAVITATION

    Sawada Masahiro , Yamamoto Yoshitaka

    … We consider a one dimensional isentropic periodic flow of a compressibleviscous fluid driven by a self-gravitation of the fluid. …

    Scientiae Mathematicae Japonicae 80(3), 247-268, 2017

    J-STAGE 

  • Effect of Number of Blades on Performance of a Gravitation Vortex Type Water Turbine  [in Japanese]

    SUZUO Ryouta , NISHI Yasuyuki , INAGAKI Terumi

    … A gravitation vortex type water turbine is a water turbine which generates power by the gravitational vortex. …

    The Proceedings of Ibaraki District Conference 2017.25(0), 302, 2017

    J-STAGE 

  • Disruptive Effect of Simulated Microgravity on Circadian Activity Rhythm of Rats and Intensity-Dependent Counter Effect of Intermittent Centrifugation  [in Japanese]

    Tajino Junichi , Aoyama Tomoki , Kuroki Hiroshi , Ito Akira , Nagai Momoko , Yamaguchi Shoki , Hirotaka Iijima , Kiyan Wataru , Nakahata Akihiro , Zhang Jue , Wang Tianshu

    … The purpose of this study was to examine whether and to what extent the intermittent gravitation attenuates the disruption of circadian activities.</p><p></p><p>【Methods】</p><p></p><p>Eight-week old male Wistar rats were hind-limb unloaded by their tail for 2 weeks(unloading period)followed by another 2-week free rearing(recovery period). …

    Congress of the Japanese Physical Therapy Association 2016(0), 0423, 2017

    J-STAGE 

  • Information for Regional Vitalization for City Hierarchies  [in Japanese]

    武市 三智子

    ICTの発展により、情報発信費用とネットワーク形成費用は低下した。したがって情報によって地域コミュニティが形成されやすくなった。 学生に対するアンケート調査によれば、学生たちは見知らぬ他人が発信した情報でも、興味を引かれれば拡散する。したがって、地域活性化を図るためには、拡散させたい情報と、学生たちが拡散したくなる情報の一致を目指すことになるのだが、その情報は、都市の階層性によって異なるのではない …

    現代社会研究 (15), 33-40, 2017

    IR 

  • Constraint on ghost-free bigravity from gravitational Cherenkov radiation

    Kimura Rampei , Tanaka Takahiro , Yamamoto Kazuhiro , Yamashita Yasuho

    We investigate gravitational Cherenkov radiation in a healthy branch of background solutions in the ghost-free bigravity model. In this model, because of the modification of dispersion relations, each …

    Physical Review D - Particles, Fields, Gravitation, and Cosmology 94(6), 2016-09-21

    IR 

Page Top