A5047752711- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Particle Detector Development and Performance
- Microbial Natural Products and Biosynthesis
- Natural product bioactivities and synthesis
- Geomagnetism and Paleomagnetism Studies
- Ionosphere and magnetosphere dynamics
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Phytochemistry and Biological Activities
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Bioactive Compounds and Antitumor Agents
- Biological and pharmacological studies of plants
- Cancer therapeutics and mechanisms
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Spacecraft Design and Technology
- Bioactive natural compounds
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Magnetic confinement fusion research
- Fungal Biology and Applications
Japan Aerospace Exploration Agency
2004-2025
Nihon University
2016-2025
Institute of Space and Astronautical Science
2006-2025
Juntendo University Hospital
2023
Suzuki (Japan)
2023
Fukuda Denshi (Japan)
2023
Fukushima Medical University
2023
Nagoya University
2016
Panasonic (Japan)
2006-2013
Kitasato University
1991-2010
We report on the ASCA results of a featureless X-ray spectrum from RX J1713.7–3946, new shell-like SNR discovered with ROSAT all-sky survey. The northwest part J1713.7–3946 was in field Galactic Plane Survey Project, and found to exhibit structure. spectrum, however, shows neither line emission nor any signature thermal origin. Instead, power-law model photon index 2.4–2.5 gives reasonable fit suggesting non-thermal Together similarity SN 1006, we propose that is second example, after...
The X-ray emission from the central region of Galactic plane, |l| ≲ 45° and |b| 04, was studied in 0.7-10 keV energy band with a spatial resolution ∼3' Advanced Satellite for Cosmology Astrophysics (ASCA) observatory. We developed new analysis method ASCA data to resolve discrete sources extended ridge (GRXE). successfully resolved 163 an flux down 10-12.5 ergs cm-2 s-1 determined intensity variations GRXE as function longitude about 1°. longitudinal variation above 4 keV, which there is...
The Sun continuously expels a huge amount of ionized material into interplanetary space as the solar wind. Despite its influence on heliospheric environment, origin wind has yet to be well identified. In this paper, we report Hinode X-ray Telescope observations active region. At edge region, located adjacent coronal hole, pattern continuous outflow soft-x-ray-emitting plasmas was identified emanating along apparently open magnetic field lines and upper corona. Estimates temperature density...
We present observations of the magnetic landscape polar region Sun that are unprecedented in terms spatial resolution, field view, and polarimetric precision. They were carried out with Solar Optical Telescope aboard Hinode. Using a Milne-Eddington inversion, we find many vertically oriented flux tubes strengths as strong 1 kG scattered latitude between 70° 90°. all have same polarity, consistent global polarity region. The vectors observed to diverge from centers elements, view fields...
The in-orbit performance and calibration of the Gas Imaging Spectrometer (GIS), located on focal plane X-ray astronomy satellite ASCA, are described. An extensive has confirmed its basic performance, including a position resolution 0.6 mm (FWHM) an energy 7.8% (FWHM), both at 6 keV. When combined with telescope, GIS sensitivity range becomes 0.7-10 non background been to be as low (5-9) × 10−4 cs−1 cm−2 keV−1 over 1-10 keV range. long-term detector gain stable within few % for nearly 3...
The ASTRO-H mission was designed and developed through an international collaboration of JAXA, NASA, ESA, the CSA. It successfully launched on February 17, 2016, then named Hitomi. During in-orbit verification phase, on-board observational instruments functioned as expected. intricate coolant refrigeration systems for soft X-ray spectrometer (SXS, a quantum micro-calorimeter) imager (SXI, CCD) also However, March 26, operations were prematurely terminated by series abnormal events mishaps...
X-ray spectra of the Galactic ridge emission in Scutum arm region have been obtained with ASCA GIS and SIS energy range 0.7-10 keV. The observed are basically thermal from thin hot plasmas, individual K lines helium-like Mg, Si, S, Fe ions confirmed both spectra. This means that cannot be explained by a single-temperature ionization-equilibrium plasma model. It cannot, however, reproduced even if nonequilibrium ionization model is introduced; thus multiple components required. fairly well...
A new arylbenzofuran, 3',5'-dihydroxy-6-methoxy-7-prenyl-2-arylbenzofuran (1), and 25 known compounds, including moracin R (2), C (3), O (4), P (5), artoindonesianin (6), D (7), alabafuran (8), mulberrofuran L (9), Y (10), kuwanon (11), (12), T (13), morusin (14), E (15), sanggenon F (16), betulinic acid (17), uvaol (18), ursolic (19), β-sitosterol (20), oxyresveratrol 2-O-β-D-glucopyranoside (21), mulberroside (22), B (23), 5,7-dihydroxycoumarin 7-O-β-D-glucopyranoside (24),...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTotal synthesis of (+)-lactacystin, the first non-protein neurotrophic factorToshiaki Sunazuka, Tohru Nagamitsu, Keiichi Matsuzaki, Haruo Tanaka, Satoshi Omura, and Amos B. Smith IIICite this: J. Am. Chem. Soc. 1993, 115, 12, 5302Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993https://pubs.acs.org/doi/10.1021/ja00065a054https://doi.org/10.1021/ja00065a054research-articleACS...
Abstract We present Hinode/EIS raster scan observations of the plage region taken during gradual phase GOES X3.2 flare that occurred on 2006 December 13. The is located 200${}^{\prime\prime}$ east arcade. has a small transient coronal hole. hole strongly affected by an X-class flare, and upflows are observed at its boundary. Multi-wavelength spectral allow us to determine velocities from Doppler shifts different temperatures. Strong along with stationary plasma have been in Fe XV line 284.2...
New phenanthrenes, loddigesiinols A (1) and B (7), stilbenes, C (8) D (9), were isolated from 80% ethanol extract of Dendrobium loddigesii ROLFE (Orcharedceae) along with known compounds, including five three two lignans, sterols. Their structures determined by spectroscopic studies. These compounds evaluated for their inhibitory activities against nitric oxide (NO) production 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging. Phenanthrenes (1—3, 7) dihydrophenanthrenes (4—6) showed...
New benzophenone and flavonol galloyl glycosides were isolated from an 80% MeOH extract of Psidium guajava L. (Myrtaceae) together with five known quercetin glycosides. The structures the novel elucidated to be 2,4,6-trihydroxybenzophenone 4-O-(6''-O-galloyl)-beta-D: -glucopyranoside (1, guavinoside A), 2,4,6-trihydroxy-3,5-dimethylbenzophenone (2, B), 3-O-(5''-O-galloyl)-alpha-L: -arabinofuranoside (3, C) by NMR, MS, UV, IR spectroscopies. Isolated phenolic showed significant inhibitory...
During a galactic-plane survey with ASCA in 1996 September, we detected relatively bright, soft source at R.A. = 17h8m46s.6, DEC. −40°9′27″ (J2000), and discovered an 11-s X-ray pulsation from the source. This has been identified ROSAT 1RXS J170849.0−400910. From timing analysis of source, obtained barycentric pulse period P 10.99759±0.00005 s broad sinusoidal shape fraction ∼ 30%. The energy spectrum 0.8–10 keV region is very soft, can be fitted by power-law model photon index 3.5...
Abstract The velocity structures of jets in a coronal hole have been derived for the first time. Hinode observations revealed existence many bright points holes. They are loop-shaped and sometimes associated with jets. Spectra obtained Extreme-ultraviolet Imaging Spectrometer aboard were analyzed to infer Doppler loops north polar region. Elongated above found be blue-shifted by 30 km s$^{-1}$ at maximum, while foot red-shifted. Blue-shifts detected interpreted as being upflows produced...