Yasutaka Konno

Learn More
We evaluated a flat-panel detector (FPD) (scintillator screen and a-Si photo-sensor array) for use in a cone-beam computed tomography (CT) detector and compared it with an image-intensifier detector (IID). The FPD cone-beam CT system has a higher spatial resolution than the IID system. At equal pixel sizes, the standard deviation of noise intensity of the(More)
The relationship between the muscle relaxant action and intramuscular concentration of unchanged dantrolene sodium [1-[5-(p-natrophenyl) furfurylidene amino] hydantoin sodium hemiheptahydrate, dantrolene] by intravenous administration of dantrolene was examined in rats. The mechanism of the muscle relaxant action of dantrolene was also examined. Dantrolene,(More)
The high-frequency-peaked BL Lac (HBL) 1ES 0806+524 (z = 0.138) was discovered in VHE γ rays in 2008. Until now, the broad-band spectrum of 1ES 0806+524 has been only poorly characterized, in particular at high energies. We analysed multiwavelength observations from γ rays to radio performed from 2011 January to March, which were triggered by the high(More)
Aims. We aim to characterize the broadband emission from 2FGL J2001.1+4352, which has been associated with the unknown-redshift blazar MG4 J200112+4352. Based on its gamma-ray spectral properties, it was identified as a potential very high energy (VHE; E > 100 GeV) gamma-ray emitter. We investigate whether this object is a VHE emitter, characterize its(More)
Context. PKS 1510–089 is one of only a few flat spectrum radio quasars detected in the VHE (very-high-energy, > 100 GeV) gamma-ray band. Aims. We study the broadband spectral and temporal properties of the PKS 1510–089 emission during a high gamma-ray state. Methods. We performed VHE gamma-ray observations of PKS 1510–089 with the MAGIC telescopes during a(More)
Indications of a GeV component in the emission from GRBs are known since the EGRET observations during the 1990’s and they have been confirmed by the data of the Fermi satellite. These results have, however, shown that our understanding of GRB physics is still unsatisfactory. The new generation of Cherenkov observatories and in particular the MAGIC(More)
We present coordinated multiwavelength observations of the bright, nearby BLLac object Mrk 421 taken in 2013 January-March, involving GASP-WEBT, Swift, NuSTAR, Fermi -LAT, MAGIC, VERITAS, and other collaborations and instruments, providing data from radio to very-high-energy (VHE) γ-ray bands. NuSTAR yielded previously unattainable sensitivity in the 3–79(More)
Supermassive black holes with masses of millions to billions of solar masses are commonly found in the centers of galaxies. Astronomers seek to image jet formation using radio interferometry but still suffer from insufficient angular resolution. An alternative method to resolve small structures is to measure the time variability of their emission. Here we(More)
  • 1