A5018169932- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Workplace Health and Well-being
- Pulsars and Gravitational Waves Research
- Occupational Health and Safety Research
- Osteoarthritis Treatment and Mechanisms
- CCD and CMOS Imaging Sensors
- Fluid Dynamics and Mixing
- Advanced X-ray Imaging Techniques
- COVID-19 and Mental Health
- Employment and Welfare Studies
- Coronary Interventions and Diagnostics
- Solar and Space Plasma Dynamics
- Heat Transfer and Boiling Studies
- Advanced X-ray and CT Imaging
- Peripheral Artery Disease Management
- Risk and Safety Analysis
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Radioactive contamination and transfer
- Stellar, planetary, and galactic studies
- Radiation Detection and Scintillator Technologies
- Disaster Response and Management
University of Occupational and Environmental Health Japan
2016-2025
University of Miyazaki
2016-2025
Saga University
2025
Yamaguchi University
2015-2024
Institute of Space and Astronautical Science
2008-2024
Japan Aerospace Exploration Agency
2010-2024
Komatsu (Japan)
2024
ORCID
2023
Kyushu Institute of Technology
2011-2023
DMG Mori (Japan)
2017-2022
High-sensitivity wide-band X-ray spectroscopy is the key feature of Suzaku observatory, launched on 2005 July 10. This paper summarizes spacecraft, in-orbit performance, operations, and data processing that are related to observations. The scientific instruments, high-throughput telescopes, CCD cameras, non-imaging hard detector also described.
Objective: This study aimed to examine a detailed breakdown of costs (absenteeism, presenteeism, and medical/pharmaceutical expenses), the employees in four pharmaceutical companies Japan. Methods: is cross-sectional study. Absenteeism presenteeism were measured by self-administered questionnaire for workers, their estimated using human capital approach. Presenteeism was evaluated degree affected quality quantity work. Medical expenses obtained insurance claims. Results: The monetary value...
We report the results of coordinated Hubble Space Telescope and Chandra observations Crab synchrotron nebula. Similar dynamical structures, including equatorial wisps moving outward at ~0.5c, are seen in both passbands. The inner X-ray ring is a variable, irregular structure from which diffuse emission emerge. X-ray/visible jet to southeast pulsar true jet. data support interpretation that highly feature base unstable quasi-stationary shocks "cold" wind polar pulsar.
The <i>Swift</i> X-ray Telescope (XRT) is designed to make astrometric, spectroscopic, and photometric observations of emission from Gamma-ray Bursts their afterglows in the energy band 0.2-10 keV. In order provide rapid-response, automated these randomly occurring objects without ground intervention, XRT must be able observe covering some seven orders magnitude flux, extracting maximum possible science each one. This requires a variety readout modes optimise information collected response...
The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions initiated by Institute Space and Astronautical Science (ISAS). will investigate physics high-energy universe performing high-resolution, high-throughput spectroscopy with moderate angular resolution. covers very wide energy range from 0.3 keV to 600 keV. allows combination band (5-80 keV) provided multilayer coating, focusing hard mirrors imaging detectors, high energy-resolution soft (0.3-12...
Sphingosine 1-phosphate (S1P) induces diverse biological responses in various tissues by activating specific G protein-coupled receptors (S1P<sub>1</sub>–S1P<sub>5</sub> receptors). The signaling regulated S1P<sub>3</sub> receptor has not been fully elucidated because of the lack an receptor-specific antagonist or agonist. We developed a novel antagonist, 1-(4-chlorophenylhydrazono)-1-(4-chlorophenylamino)-3,3-dimethyl- 2-butanone (TY-52156), and show here that S1P-induced decrease coronary...
We present results obtained from a series of observations the supernova remnant RX J1713.7-3946 by Suzaku satellite. The cover about two-thirds surface. successfully detected hard X-rays up to ~ 40 keV each pointing. X-ray spectra are described power-law functions with photon indices 3.0, which larger than those in energy region below 10 keV. Connection spatially-integrated XIS and HXD clearly reveals spectral cutoff 0.4--40 spectrum. This is interpreted correspond maximum acceleration...
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...
Musculoskeletal symptoms such as neck and shoulder pain/stiffness low back pain are common health problems in the working population. They leading causes of presenteeism (employees being physically present at work but unable to be fully engaged). Recently, digital interventions have begun used manage their effectiveness has not yet been verified, adherence programs is always a problem.This study aimed evaluate improvements musculoskeletal workers with neck/shoulder stiffness/pain after use...
Objective: The present study was designed to examine the effects of active rest by workplace units on not only workers' individual vigor but also and presenteeism. Methods: A total 130 workers performed our (short-time exercise) program for 10 minutes per day during their lunch breaks, three four times week 8 weeks. Subjects from a unit were randomly allocated intervention (n = 66) or control 64) groups. participants' work engagement Work Functioning Impairment Scale (WFun) examined at...
The birth properties of neutron stars yield important information on the still debated physical processes that trigger explosion and intrinsic neutron-star physics. These include high space velocities young with average values several 100 km/s, whose underlying "kick" mechanism is not finally clarified. There are two competing possibilities could accelerate NSs during their birth: anisotropic ejection either stellar debris or neutrinos. We here present new evidence from X-ray measurements...
The X-Ray Imaging and Spectroscopy Mission (XRISM) is the successor to 2016 Hitomi mission that ended prematurely. Like Hitomi, primary science goals are examine astrophysical problems with precise highresolution X-ray spectroscopy. XRISM promises discover new horizons in astronomy. carries a 6 x pixelized micro-calorimeter on focal plane of an mirror assembly co-aligned CCD camera covers same energy band over large field view. utilizes heritage, but all designs were reviewed. attitude orbit...
The charge transfer inefficiency (CTI) of the X-ray CCDs aboard Suzaku satellite (X-ray Imaging Spectrometers: XIS) has increased since launch due to radiation damage, and energy resolution been degraded. To improve CTI, we have applied a spaced-row injection (SCI) technique XIS in orbit; by injecting charges into CCD rows periodically, CTI is actively decreased. SCI mode depends on distance between signal preceding injected row, pulse height shows periodic positional variations. Using...
We present X-ray proper-motion measurements of the forward shock and reverse-shocked ejecta in Tycho's supernova remnant, based on three sets archival Chandra data taken 2000, 2003, 2007. find that proper motion edge remnant (i.e., protruding knots) varies from 0".20 yr^{-1} (expansion index m=0.33, where R = t^m) to 0".40 (m=0.65) with azimuthal angle 2000-2007 measurements, 0".14 (m=0.26) 2003-2007 measurements. The variation average expansion ~0.5 are consistent those derived radio...
Abstract Objectives Little is known about workplace measures against coronavirus disease 2019 (COVID-19) in Japan during the winter of 2020, especially micro-, small-, and medium-sized enterprises (MSMEs). This study aimed to provide an overview current situation anti-COVID-19 Japanese winter, considering company size. Methods was Internet-based nationwide cross-sectional study. Individuals who were registered as full-time workers invited participate survey. Data collected using online...
The behavior of concrete-filled circular and square steel tubular (CFT) beam columns with a variety material strengths was investigated experimentally. main test parameters are strength (400, 590, 780 MPa), diameter- (width-) to-thickness ratio tube, concrete (40 90 MPa). interior beam-column models were tested under constant axial compression cyclic horizontal load incrementally increasing lateral deformation to clarify the effects on behavior. exterior laterally loaded variable load,...
We present spectral analysis of the Crab Nebula obtained with {\it Chandra} X-ray observatory. The spectrum is characterized by a power-law whose index varies across nebula. variation can be discussed in terms particle injection from pulsar two different directions: equatorial plane containing torus and symmetry axis along jet. In plane, spectra within are hardest, photon $α\approx 1.9$, almost independent surface brightness. At periphery torus, gradually softens outer, lower brightness...
Various X-ray satellites have used the Crab as a standard candle to perform their calibrations in past. The calibration of XMM-Newton, however, is independent nebula, because this object has not been adjust spectral issues. In 2004 number special observations were performed measure parameters and absolute flux with XMM-Newton's EPIC-pn CCD camera. We describe results campaign detail compare them data four current missions (Integral, Swift, Chandra, RXTE) numerous previous (ROSAT, EXOSAT,...
X-ray spectroscopic measurements of the Cygnus Loop supernova remnant indicate that metal abundances throughout most remnant's rim are depleted to ∼0.2 times solar value. However, recent studies have revealed in some narrow regions along outermost anomalously "enhanced" (up ∼1 solar). The reason for these anomalous is not understood. Here, we examine spectra annular sectors covering nearly entire using Suzaku (21 pointings) and XMM-Newton (1 pointing). We find abundance commonly show a...
We report the first detection of thermal X-ray line emission from supernova remnant (SNR) RX J1713.7-3946, prototype small class synchrotron-dominated SNRs. A softness-ratio map generated using XMM-Newton data shows that faint interior regions are softer than bright shell regions. Using Suzaku and deep observations, we have extracted spectra softest area, finding clear features at 1 ∼1.35 keV. These lines can be best explained as Ne Lyα Mg Heα a component. Since abundance ratios metals to Fe...
Abstract Objectives The health effects of telework, which was introduced extensively in the immediate context COVID-19 pandemic crisis Japan, on teleworkers, their families, and non-teleworkers, are unknown. Accordingly, we developed a rapid impact assessment (HIA) to evaluate positive negative telework these groups recommended easily implementable countermeasures. Methods Immediately after an emergency declared implemented rapid, five-step HIA. We screened categorized for three...
Abstract Supernova (SN) 1987A is one of the best candidates to exploit capabilities freshly launched XRISM satellite. This celestial object offers unique opportunity study evolution an SN into a young supernova remnant. To date, X-ray emission has been dominated by shocked circumstellar medium, with no ejecta firmly detected. However, recent studies provide compelling evidence that in forthcoming years, from will increasingly stem ejecta. Our aim assess proficiency XRISM-Resolve...