Current Status of the Suzaku Wide-band All-sky Monitor (WAM)

2009 ◽  
Author(s):  
Kazutaka Yamaoka ◽  
Satoshi Sugita ◽  
Makoto Tashiro ◽  
Yukikatsu Terada ◽  
Yuji Urata ◽  
...  
Keyword(s):  
Wide Band ◽  
Current Status ◽  
Sky Monitor

Development of the HXD-II wide-band all-sky monitor onboard Astro-E2

2005 ◽  
Vol 52 (6) ◽  
pp. 2765-2772 ◽  
Author(s):  
K. Yamaoka ◽  
M. Ohno ◽  
Y. Terada ◽  
S. Hong ◽  
J. Kotoku ◽  
...  
Keyword(s):  
Wide Band ◽  
Sky Monitor

scholarly journals Development and Application of Resistance Strain Force Sensors

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5826
Author(s):  
Yinming Zhao ◽  
Yang Liu ◽  
Yongqian Li ◽  
Qun Hao
Keyword(s):  
Stress Transfer ◽  
Wide Band ◽  
Resistance Strain ◽  
Current Status ◽  
Force Sensors ◽  
Technical Requirements ◽  
Creep Effect ◽  
Wide Range ◽  
Sustained Loads ◽  
Recent Developments

Resistance strain force sensors have been applied to monitor the strains in various parts and structures for industrial use. Here, we review the working principles, structural forms, and fabrication processes for resistance strain gauges. In particular, we focus on recent developments in resistance stress transfer for resistance strain force sensors and the creep effect due to sustained loads and/or temperature variations. Various error compensation methods to reduce the creep effect are analyzed to develop a metrology standard for resistance strain force sensors. Additionally, the current status of carbon nanotubes (CNTs), silicon carbide (SiC), gallium nitride (GaN), and other wide band gap semiconductors for a wide range of strain sensors are reviewed. The technical requirements and key issues of resistance strain force sensors for future applications are presented.

scholarly journals Design and In-Orbit Performance of the Suzaku Wide-Band All-Sky Monitor

2009 ◽  
Vol 61 (sp1) ◽  
pp. S35-S53 ◽  
Author(s):  
Kazutaka Yamaoka ◽  
Akira Endo ◽  
Teruaki Enoto ◽  
Yasushi Fukazawa ◽  
Ryuji Hara ◽  
...  
Keyword(s):  
Wide Band ◽  
Sky Monitor

scholarly journals Sub-MeV band observation of a hard burst from AXP 1E 1547.0−5408 with the Suzaku Wide-band All-sky Monitor

2015 ◽  
Vol 67 (3) ◽  
pp. 41 ◽  
Author(s):  
Tetsuya Yasuda ◽  
Wataru B. Iwakiri ◽  
Makoto S. Tashiro ◽  
Yukikatsu Terada ◽  
Tomomi Kouzu ◽  
...  
Keyword(s):  
Wide Band ◽  
Sky Monitor

scholarly journals Spectral properties of gamma-ray bursts observed by the Suzaku wide-band all-sky monitor

2019 ◽  
Vol 71 (4) ◽  
Author(s):  
Norisuke Ohmori ◽  
Kazutaka Yamaoka ◽  
Makoto Yamauchi ◽  
Yuji Urata ◽  
Masanori Ohno ◽  
...  
Keyword(s):  
Short Duration ◽  
Power Law ◽  
Spectral Properties ◽  
Gamma Ray ◽  
Wide Band ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Sky Monitor ◽  
S Peak ◽  
Single Power

Abstract We have systematically studied the spectral properties of 302 localized gamma-ray bursts (GRBs) observed by the Suzaku wide-band all-sky monitor (WAM) from 2005 August to 2010 December. The energy spectra in the 100–5000 keV range integrated over the entire emission and the 1 s peak were fitted by three models: a single power law, a power law with an exponential cutoff (CPL), and the GRB Band function (GRB). Most of the burst spectra were well fitted by a single power law. The average photon index α was −2.11 and −1.73 for long and short bursts, respectively. For the CPL and GRB models, the low-energy and high-energy photon indices (α and β) for the entire emission spectra were consistent with previous measurements. The averages of the α and β were −0.90 and −2.65 for long-duration GRBs, while the average α was −0.55 and the β was not well constrained for short-duration GRBs. However, the average peak energy Epeak was 645 and 1286 keV for long- and short-duration GRBs respectively, which are higher than previous Fermi/GBM measurements (285 keV and 736 keV). The α and Epeak of the 1 s peak spectra were larger, i.e., the spectra were harder, than the total fluence spectra. Spectral simulations based on Fermi-GBM results suggest that the higher Epeaks measured by the Suzaku WAM could be due to detector selection bias, mainly caused by the limited energy range above 100 keV.

Timing Analysis of Unusual GRB 090709A Observed by Suzaku Wide-band All sky Monitor

2010 ◽  
Author(s):  
W. Iwakiri ◽  
M. Ohno ◽  
T. Kamae ◽  
Y. E. Nakagawa ◽  
Y. Terada ◽  
...  
Keyword(s):  
Timing Analysis ◽  
Wide Band ◽  
Sky Monitor

Optoelectronic matrix switching

1989 ◽  
Vol 67 (4) ◽  
pp. 389-393 ◽  
Author(s):  
R. I. MacDonald
Keyword(s):  
Cross Talk ◽  
Electromagnetic Coupling ◽  
Integrated Control ◽  
Forward Bias ◽  
Wide Band ◽  
Optical Signal ◽  
Current Status ◽  
Design Matrix ◽  
Hybrid Technique ◽  
Zero Bias

Because cross talk from electromagnetic coupling increases with frequency, it is difficult to design matrix switches for high-frequency electronic signals. Signals on optical carriers are easier to isolate but more difficult to switch. A hybrid technique exploiting passive optical-signal distribution and switching by optoelectronic effects shows good promise for high isolation matrices to handle signals in the dc to 10 GHz range. The key elements for such optoelectronic switches are optical detectors that have switchable sensitivity.Initial efforts in optoelectronic switching used silicon diode detectors and forward bias to establish the off-state. Recent work has turned primarily to photoconductors fabricated in GaAs or other compound semiconductors. Such photoconductors can have very wide response bandwidths and have the advantage of a zero-bias off-state. Efforts have also been made to develop bipolar detectors that do not need forward bias for the off-state.Experimental work has progressed to the demonstration of complete matrices capable of switching up to eight incoming signals to as many outgoing lines, at bandwidths up to 500 MHz and cross-talk levels below 50 dB. Results for individual switching devices give promise of matrices for many tens of lines and bandwidths to several gigahertz. Monolithic integration of GaAs photoconductor switch arrays has been demonstrated, and work progresses to include integrated control devices and amplifiers.Matrix switches of large dimension and very large bandwidth are expected to have significant applications in areas other than communications switching. In particular, such matrices can be used to set up patterns of delay and signal recombination, using fibre delay lines, to provide rapidly selectable wide-band delay for phasing and other applications, or for wide-band tapped delay-line filters that can be reconfigured rapidly.A review of the current status in optoelectronic matrix switching is given.

scholarly journals Suzaku Wide-band All-sky Monitor (WAM) observations of GRBs and SGRs

2017 ◽  
Vol 69 (3) ◽  
Author(s):  
Kazutaka Yamaoka ◽  
Masanori Ohno ◽  
Makoto S. Tashiro ◽  
Kevin Hurley ◽  
Hans A. Krimm ◽  
...  
Keyword(s):  
Wide Band ◽  
Sky Monitor

scholarly journals Suzaku Wide-band All-sky Monitor – 10 Years history

2019 ◽  
Author(s):  
Masanori Ohno ◽  
Yasushi Fukazawa ◽  
Takafumi Kawano ◽  
Kazutaka Yamaoka ◽  
Makoto S. Tashiro ◽  
...  
Keyword(s):  
Wide Band ◽  
Sky Monitor

scholarly journals Spectral Evolutions Study of Gamma-Ray Burst Exponential Decays with Suzaku-WAM

2011 ◽  
Vol 7 (S279) ◽  
pp. 411-412
Author(s):  
Makoto S. Tashiro ◽  
Kaori Onda ◽  
Kazutaka Yamaoka ◽  
Masahiro Ohno ◽  
Satoshi Sugita ◽  
...  
Keyword(s):  
Exponential Decay ◽  
Gamma Ray ◽  
Thermal Emission ◽  
Wide Band ◽  
Light Curves ◽  
Emission Model ◽  
Spectral Evolution ◽  
Time Resolved ◽  
Gamma Ray Burst ◽  
Sky Monitor

AbstractAn observational study is presented of the spectral evolution of gamma-ray burst (GRB) prompt emissions with the Suzaku Wide-band All-sky Monitor (WAM). We selected 6 bright GRBs exhibiting 7 well-separated fast-rise-exponential-decay (FRED) shaped light curves to investigate spectral changes by evaluating exponential decay time constants of the energy-resolved light curves. In addition, we carried out time-resolved spectroscopy of two of them which were located with accuracy sufficient to evaluate the time-resolved spectra with precise energy response matrices. The two imply different emission mechanisms; the one is well reproduced with a cooling blackbody radiation model with a power-law component, while the other prefers non-thermal emission model with a decaying turn over energy.

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