A5005851378- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Electrocatalysts for Energy Conversion
- Radio Astronomy Observations and Technology
- Fuel Cells and Related Materials
- Electrochemical Analysis and Applications
- Particle Detector Development and Performance
- Neutrino Physics Research
- Astrophysical Phenomena and Observations
- Advanced battery technologies research
- Silicon Nanostructures and Photoluminescence
- Force Microscopy Techniques and Applications
- Advanced Photonic Communication Systems
- Structural Behavior of Reinforced Concrete
- Optical Network Technologies
- Spectroscopy and Quantum Chemical Studies
- Pulsars and Gravitational Waves Research
- Anodic Oxide Films and Nanostructures
- Wind Energy Research and Development
- Wind and Air Flow Studies
- Structural Load-Bearing Analysis
- Geophysics and Gravity Measurements
- Solar Energy Systems and Technologies
- Nanowire Synthesis and Applications
Toyota Central Research and Development Laboratories (Japan)
2010-2021
Toyota Research Institute
2019-2020
Toyota Motor Corporation (Switzerland)
2013-2020
Osaka University
2003-2019
Kyushu University
2013-2017
Iowa State University
2007-2010
University of Chicago
2004-2009
Fermi National Accelerator Laboratory
2009
Kwansei Gakuin University
2008
Japan Science and Technology Agency
2006-2008
We report results from an intensive multiwavelength monitoring campaign on the TeV blazar Mrk 421 over period of 2003-2004. The source was observed simultaneously at energies with Whipple 10 m telescope and X-ray Rossi X-Ray Timing Explorer (RXTE) during each clear night within observing windows. Supporting observations were also frequently carried out optical radio wavelengths to provide simultaneous or contemporaneous coverages. large amount data has allowed us examine variability in...
LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very energy gamma-rays. The system was observed over several orbital cycles (between September 2006 and February 2007) with the VERITAS array imaging air-Cherenkov telescopes. A signal gamma-rays energies above 300 GeV found statistical 8.4 standard deviations. flux measured to be strongly variable; maximum during most apastron. spectrum for period emission can characterized by power law...
Designing highly active oxygen reduction reaction (ORR) catalysts is crucial to boost the fuel cell economy. Previous research has mainly focused on Pt-based alloy in which surface Pt solely site and activity improvement was challenged by discovered scaling relationship. Herein we report a new concept of utilizing dual sites for ORR demonstrate its effectiveness synthesizing SnOx/Pt–Cu–Ni heterojunctioned catalyst. A maximum 40% enhancement apparent specific activity, corresponds 10-fold...
We report a possible detection of TeV gamma-rays from the Galactic Center by Whipple 10m gamma-ray telescope. Twenty-six hours data were taken over an extended period 1995 through 2003 resulting in total significance 3.7 standard deviations. The measured excess corresponds to integral flux \Flux above energy $2.8 \mathrm{TeV}$, roughly 40% Crab Nebula at this energy. 95% confidence region has angular extent about 15 arcmin and includes position Sgr A*. is consistent with point source shows...
The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring active galactic nuclei from waves TeV γ-rays. Here we report detection γ-ray emission above 250 GeV spring 2007 with VERITAS atmospheric Cerenkov telescope array and discuss its correlation X-ray emission. is measured be pointlike an intrinsic source radius less than 4.5'. differential energy spectrum fitted well by power-law function: dΦ/dE = (7.4 ± 1.3stat...
The intermediate-frequency peaked BL Lacertae (IBL) object 3C 66A is detected during 2007 - 2008 in VHE (very high energy: E > 100 GeV) gamma-rays with the VERITAS stereoscopic array of imaging atmospheric Cherenkov telescopes. An excess 1791 events detected, corresponding to a significance 21.2 standard deviations (sigma), these observations (32.8 hours live time). observed integral flux above 200 GeV 6% Crab Nebula's and shows evidence for variability on time-scale days. measured energy...
VERITAS, an Imaging Atmospheric Cherenkov Telescope (IACT) system for gammma‐ray astronomy in the GeV‐TeV range, has recently completed its first season of observations with a full array four telescopes. A number astrophysical gamma‐ray sources have been detected, both galactic and extragalactic, including previously unknown at TeV energies. We describe status some highlight results, assess technical performance, sensitivity shower reconstruction capabilities.
Since September 2005, the Whipple 10m Gamma-ray Telescope has been operated primarily as a blazar monitor. The five Northern Hemisphere blazars that have already detected at Observatory, Markarian 421, H1426+428, 501, 1ES 1959+650 and 2344+514, are monitored routinely each night they visible. We report on 421 observations taken from November 2005 to June 2006 in gamma-ray, X-ray, optical radio bands. During this time, was found be variable all wavelengths probed. Both variability...
We report the detection of very high energy γ-ray emission from intermediate-frequency-peaked BL Lacertae object W Comae (z = 0.102) by VERITAS. The source was observed between 2008 January and April. A strong outburst measured in middle March, lasting for only 4 days. spectrum during two highest flare nights is fit a power law found to be steep, with differential photon spectral index Γ 3.81 ± 0.35stat± 0.34syst. integral flux above 200 GeV those corresponds roughly 9% Crab Nebula....
We report the first detection of very-high-energy (VHE) gamma-ray emission above 140 GeV from PKS 1424+240, a BL Lac object with an unknown redshift. The photon spectrum measured by VERITAS is well described power law index 3.8 +- 0.5_stat 0.3_syst and flux normalization at 200 (5.1 0.9_stat 0.5_syst) x 10^{-11} TeV^-1 cm^-2 s^-1, where stat syst denote statistical systematical uncertainty, respectively. VHE steady over observation period between MJD 54881 55003 (2009 February 19 to June...
We present the first strong detection of very high energy gamma-rays from close (z=0.048) X-ray selected BL Lacertae object 1ES1959+650. Observations were made with Whipple 10m telescope on Mt. Hopkins, Arizona, using atmospheric Cherenkov imaging technique. The flux between May and July 2002 was highly variable, a mean 0.64 +/- 0.03 times steady Crab Nebula reaching maximum five Crab, variability timescales as short seven hours.
The VERITAS collaboration reports the detection of very-high-energy gamma-ray emission from high-frequency-peaked BL Lac object 1ES 1218+304 located at a redshift z = 0.182. A signal was detected with statistical significance 10.4 standard deviations (10.4σ) for observations taken during first three months 2007, confirming discovery this made by MAGIC collaboration. photon spectrum between ∼160 GeV and ∼1.8 TeV is well described power law an index Γ 3.08 ± 0.34stat 0.2sys. integral flux...
We present results from an intensive VERITAS monitoring campaign of the high-frequency peaked BL Lac object 1ES 1218+304 in 2008/2009. Although was detected previously by MAGIC and at a persistent level ~6% Crab Nebula flux, new data reveal prominent flare reaching ~20% Crab. While very high energy (VHE) flares are quite common many nearby blazars, case (redshift z = 0.182) is particularly interesting since it belongs to group blazars that exhibit unusually hard VHE spectra considering their...
Wind lens is a new type of wind power system consisting simple brimmed ring structure that surrounds the rotor causing greater to pass through turbine. As consequence, turbine's efficiency capturing energy from gets dramatically increased. A turbine can generate 2–5 times an existing given at same diameter and incoming speed. This fluid dynamical effect also effective in water. We have developed 1–3 kW turbines 100 In addition enhanced output power, quiet. The technology now used offshore...
The BL Lac object H1426+428 was recently detected as a high energy gamma-ray source by the VERITAS collaboration (Horan et al. 2002). We have reanalyzed 2001 portion of data used in detection order to examine spectrum above 250 GeV. find that time-averaged agrees with power law shape dF/dE = 10^(-7.31 +- 0.15(stat) 0.16(syst)) x E^(-3.50 0.35(stat) 0.05(syst)) m^(-2)s^(-1)TeV^(-1) statistical evidence from our for emission 2.5 TeV is 2.6 sigma. With 95% c.l., integral flux larger than 3%...
The high-frequency-peaked BL Lacertae object 1ES 0806+524, at redshift z = 0.138, was observed in the very high energy (VHE) gamma-ray regime by VERITAS between 2006 November and 2008 April. These data encompass two- three-telescope commissioning phases, as well observations with full four-telescope array. 0806+524 is detected a statistical significance of 6.3 standard deviations from 245 excess events. Little or no measurable variability on monthly timescales found. photon spectrum for...
For weakly coupled mode-division multiplexed (MDM) transmission systems, we design and implement optical coherent receiver prototypes with real-time multiple-input multiple-output (MIMO) digital signal processing to equalize two degenerate linearly polarized modes dual polarization. Using field programmable gate array circuits, real-value 8 × 2 MIMO adaptive equalization externally separated phase compensators based on the least mean square algorithm, which enables not only training but also...
We present results from observations of 29 BL Lacertae objects, taken with the Whipple Observatory 10 m Gamma-Ray Telescope between 1995 and 2000. The observed objects are mostly at low redshift (z < 0.2) but z up to 0.444 also reported. Five EGRET sources two unconfirmed TeV sources. Three confirmed extragalactic gamma rays were originally as part this survey have been reported elsewhere. No significant excesses detected any other observed, on time scales days, months or years. report 99.9%...
RDE-based accelerated stress tests (ASTs) are often used for early-stage research of fuel cell catalysts, in which the electrochemical surface area (ECSA) and mass activity (MA) usually measured only at beginning end testing procedure, although their intermediate values transitional period very important to understand degradation mechanisms. This is because ECSA MA O2-free O2-saturated electrolytes, respectively, frequent gas switching introduces extra burden already lengthy AST. In this...
The blazar 1ES 1959+650 was observed in a flaring state with the Whipple 10 m Imaging Atmospheric Cherenkov Telescope during May of 2002. A spectral analysis has been carried out on data from that time period and resulting very high energy gamma-ray spectrum ($E \geq 316$ GeV) can be well fit by power-law differential index \alpha = 2.78 +/- 0.12_{stat.} 0.21_{sys.}. On June 4th 2002, source flared dramatically range without any coincident increase X-ray emission, providing first unambiguous...
We present observations of the dwarf galaxies Draco and Ursa Minor, local group M32 M33, globular cluster M15 conducted with Whipple 10m gamma-ray telescope to search for signature self-annihilating weakly interacting massive particles (WIMPs) which may constitute astrophysical dark matter (DM). review motivations selecting these sources based on their unique environments report results data analysis produced upper limits excess rate gamma rays each source. consider models DM distribution in...