Shin-ichiro Sakai
A5049581704- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Superconducting and THz Device Technology
- Pulsars and Gravitational Waves Research
- Alkaloids: synthesis and pharmacology
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Planetary Science and Exploration
- Inertial Sensor and Navigation
- Solar and Space Plasma Dynamics
- Space Satellite Systems and Control
- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Stellar, planetary, and galactic studies
- Marine Sponges and Natural Products
- Vehicle Dynamics and Control Systems
- Berberine and alkaloids research
- Spacecraft Dynamics and Control
- Oxidative Organic Chemistry Reactions
- Astronomy and Astrophysical Research
- Chemical synthesis and alkaloids
- Adaptive optics and wavefront sensing
- GNSS positioning and interference
- Astrophysical Phenomena and Observations
- Atmospheric Ozone and Climate
Hokkaido University
2024
International Society of Automation
2024
Japan Aerospace Exploration Agency
2008-2021
Institute of Space and Astronautical Science
2007-2021
The University of Tokyo
1999-2000
Chiba University
1989-1995
Abstract The Deci-hertz Interferometer Gravitational Wave Observatory (DECIGO) is a future Japanese space mission with frequency band of 0.1 Hz to 10 Hz. DECIGO aims at the detection primordial gravitational waves, which could have been produced during inflationary period right after birth Universe. There are many other scientific objectives DECIGO, including direct measurement acceleration expansion Universe, and reliable accurate predictions timing locations neutron star/black hole binary...
DECIGO (DECi-hertz Interferometer Gravitational wave Observatory) is the planned Japanese space gravitational antenna, aiming to detect waves from astrophysically and cosmologically significant sources mainly between 0.1 Hz 10 thus open a new window for astronomy universe. will consists of three drag-free spacecraft arranged in an equilateral triangle with 1000 km arm lengths whose relative displacements are measured by differential Fabry-Perot interferometer, four units triangular...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLyngbyatoxins B and C, Two New Irritants from Lyngbya majusculaNorio Aimi, Hideo Odaka, Shin-ichiro Sakai, Hirota Fujiki, Masami Suganuma, Richard E. Moore, Gergory M. L PattersonCite this: J. Nat. Prod. 1990, 53, 6, 1593–1596Publication Date (Print):November 1, 1990Publication History Published online1 July 2004Published inissue 1 November 1990https://pubs.acs.org/doi/10.1021/np50072a035https://doi.org/10.1021/np50072a035research-articleACS...
LiteBIRD [Lite (Light) satellite for the studies of B-mode polarization and Inflation from cosmic background Radiation Detection] is a small to map microwave (CMB) radiation over full sky at large angular scales with unprecedented precision. Cosmological inflation, which leading hypothesis resolve problems in Big Bang theory, predicts that primordial gravitational waves were created during inflationary era. Measurements CMB are known as best probe detect waves. The working group authorized...
HISAKI (SPRINT-A) satellite is an earth-orbiting Extreme UltraViolet (EUV) spectroscopic mission and launched on 14 Sep. 2013 by the launch vehicle Epsilon-1. ultraviolet spectroscope (EXCEED) onboard will investigate plasma dynamics in Jupiter’s inner magnetosphere atmospheric escape from Venus Mars. EUV spectroscopy useful to measure electron density temperature ion composition environment. EXCEED also has advantage spatial distribution of plasmas around planets. To radial Jovian emissions...
A space gravitational-wave antenna, DECIGO (DECI-hertz interferometer Gravitational wave Observatory), will provide fruitful insights into the universe, particularly on formation mechanism of supermassive black holes, dark energy and inflation universe. In current pre-conceptual design, be comprising four units; each unit formed by three drag-free spacecraft with 1000 km separation. Since an extremely challenging mission high-precision flight long baseline, it is important to increase...
LiteBIRD is a next generation satellite aiming for the detection of Cosmic Microwave Background (CMB) B-mode polarization imprinted by primordial gravitational waves generated in era inflationary universe. The science goal to measure tensor-to-scaler ratio r with precision δr < 10<sup>-3</sup>♦, offering us crucial test major large-single-field slow-roll inflation models. planned conduct an all sky survey at sun-earth second Lagrange point (L2) angular resolution about 0.5...
AbstractElectric vehicles (EVs) are driven by motor, which is an excellent actuator for motion control compared to combustion engines or hydraulic braking systems. One essential advantage motor its fast and precise torque response. Thus, EVs, fast, feedback can be applied in EVs. In this paper such with anti skid control, Some experimental results show the effect of controller attempts increase equivalent wheel inertia. Then influence actuator's response delay evaluated, resulting that...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThiadiazole Derivatives: Highly Potent and Specific HIV-1 Reverse Transcriptase InhibitorsYasuaki Hanasaki, Hiroyuki Watanabe, Kimio Katsuura, Hiromitsu Takayama, Seiichiro Shirakawa, Kentaro Yamaguchi, Shin-ichiro Sakai, Katsushi Ijichi, Masatoshi Fujiwara, Cite this: J. Med. Chem. 1995, 38, 12, 2038–2040Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June...
A method for in-orbit estimation of time-varying residual magnetic moment (RMM) is presented. By use a simple approach, the covariance Kalman filter adapted to get better tracking in case unexpected abrupt changes RMM without sacrificing accuracy. The proposed does not need priori information about magnitude change and assures both accurate good performance with different magnitudes.
We present the mission design of LiteBIRD, a next generation satellite for study B-mode polarization and inflation from cosmic microwave background radiation (CMB) detection. The science goal LiteBIRD is to measure CMB with sensitivity δr = 0:001, this allows testing major single-field slow-roll models experimentally. instrumental purely driven achieve goal. At earlier stage design, several key specifications, e.g. observing band, optical system, scan strategy, orbit, need be defined in...
It is essential to achieve fine pointing stability in a space mission aiming for high resolutional observations. In future Japanese solar SOLAR-C, which successor of the HINODE (SOLAR-B) mission, we set targets angular resolution better than 0.1 arcsec visible light and 0.2 - 0.5 EUV X-rays. These resolutions are twice five times those corresponding instruments onboard HINODE. To identify critical items requirements assessed in-flight performance that achieved highest missions. We realized...
In this paper, we propose the optimal slip ratio estimation method based on Fuzzy Inference. One of remarkable advantages electric vehicle (EV) is quick and precise torque response motor, which realizes a novel traction control system (TCS). To prevent wheel skid phenomena, has been successfully developed. It maintains to value gives maximum driving force. The remaining problem how generate command controller. First, indicate that effective difficult for simple gradient method, one...
Abstract In den beiden Arbeiten werden Strukturen von Inhaltsstoffen aus Gardneria multi= flora bestimmt, z.B. Gardmultin (I) sowie Basen wie (II).