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Gold nanoparticles have been conformally coated with amorphous silica (using a sol-gel method) and then an organic polymer (via surface-grafted, atom transfer radical polymerization) to form spherical colloids with a core-double-shell structure. The thickness of silica and polymer shells could be conveniently controlled in the range of tens to several(More)
Anisotropy in the arrival directions of cosmic rays with energies above 10 17 eV is studied using data from the Akeno 20 km 2 array and the Akeno Giant Air Shower Array (AGASA), using a total of about 114,000 showers observed over 11 years. In the first harmonic analysis, we have found strong anisotropy of ∼ 4% around 10 18 eV, corresponding to a chance(More)
We report a rst result on the cosmic ray energy spectrum above 3 10 18 eV measured by the Akeno Giant Air Shower Array (AGASA) from July 1990 to February 1994. The analysis method and the energy resolution of the AGASA experiment are described in some detail. The attening of the spectrum around 10 19 eV (ankle) is observed with a signicance of 2.9. If we(More)
A very energetic cosmic ray of energy about (1.72.6)10 20 eV was observed by the Akeno Giant Air Shower Array (AGASA) on December 3, 1993 from the direction of galactic longitude l=131 and galactic latitude b=-41 within an error circle of 1.0 radius. Shower characteristics such as lateral distribution and arrival time spread of charged particles, and(More)
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