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124. Effect of gamma irradiation on Schottky-contacted vertically aligned ZnO nanorod-based hydrogen sensorSapana Ranwa, Surendra Singh Barala, Mattia Fanetti, Mahesh Kumar, 2016, original scientific article Abstract: We report the impact of gamma irradiation on the performance of a gold Schottky-contacted ZnO nanorod-based hydrogen sensor. RF-sputtered vertically aligned highly c-axis-oriented ZnO NRs were grown on Si(100) substrate. X-ray diffraction shows no significant change in crystal structure at low gamma doses from 1 to 5 kGy. As gamma irradiation doses increase to 10 kGy, the single crystalline ZnO structure converts to polycrystalline. The photoluminescence spectra also shows suppression of the near-band emission peak and the huge wide-band spectrum indicates the generation of structural defects at high gamma doses. At 1 kGy, the hydrogen sensor response was enhanced from 67% to 77% for 1% hydrogen in pure argon at a 150 °C operating temperature. However, at 10 kGy, the relative response decreases to 33.5%. High gamma irradiation causes displacement damage and defects in ZnO NRs, and as a result, degrades the sensor's performance as a result. Low gamma irradiation doses activate the ZnO NR surface through ionization, which enhances the sensor performance. The relative response of the hydrogen sensor was enhanced by ∼14.9% with respect to pristine ZnO using 1 kGy gamma ray treatment. © 2016 IOP Publishing Ltd.
Keywords: ZnO, nanorods, gamma irradiation, sensor
Published in RUNG: 12.01.2017; Views: 5347; Downloads: 0
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125. High Energy Emission from Gamma Ray BurstsLili Yang, invited lecture at foreign university Abstract: Gamma Ray Bursts (GRBs) are the most energetic explosions in the universe, and they have been proposed as the most promising candidate sources of ultra-high energy cosmic rays (UHECRs). As a result of interactions of UHECR within the host environment and during their propagation towards Earth, high energy neutrinos and photons are also expected from both prompt and afterglow emission. In this talk, I will review the standard theory of particle acceleration and production in a GRB fireball, and multi-wavelength and multi-messeger observations of GRB emission. I will present the prediction of PeV — EeV neutrino production and evidence of GeV gamma ray radiation, and the expected detection in IceCube, Pierre Auger Observatory and CTA (the next generation of Imaging Atmospheric Cherenkov Telescopes). The investigation of high-energy particles will provide insight into the nature and complicated mechanisms of GRBs.
Keywords: Gamma-Ray Bursts, high-energy emission, blastwave afterglow
Published in RUNG: 06.12.2016; Views: 5800; Downloads: 0
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126. Performance of the Mechanical Structure of the SST-2M GCT proposed for the Cherenkov Telescope ArrayJean-Laurent Dournaux, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, published scientific conference contribution Keywords: Cherenkov Telescope Array, small-size telescope (SST) design for CTA, dual-mirror (2M) Schwarzschild-Couder optical design, Gamma Cherenkov Telescope (GCT): SST-2M telescope design, mechanical structure
Published in RUNG: 21.11.2016; Views: 5491; Downloads: 246
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127. The first GCT camera for the Cherenkov Telescope ArrayA. De Franco, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, published scientific conference contribution Keywords: Cherenkov Telescope Array (CTA), small-size telescope (SST) design for CTA, dual-mirror (2M) Schwarzschild-Couder design, Gamma Cherenkov Telescope (GCT): SST-2M telescope design for CTA, imaging camera
Published in RUNG: 21.11.2016; Views: 5346; Downloads: 118
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128. TARGET: toward a solution for the readout electronics of the Cherenkov Telescope ArrayL. Tibaldo, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, published scientific conference contribution Keywords: very-high energy (VHE) gamma-ray astronomy, air Cherenkov imaging detection technique, Cherenkov Telescope Array (CTA), TARGET readout electronics for CTA cameras
Published in RUNG: 18.11.2016; Views: 6372; Downloads: 260
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129. The SST-1M camera for the Cherenkov Telescope ArrayE. J. Schioppa, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, published scientific conference contribution Keywords: very-high energy (VHE) gamma-ray astronomy, Cherenkov Telescope Array (CTA), small-size telescopes (SST) for CTA, Davies-Cotton design, imaging camera
Published in RUNG: 09.11.2016; Views: 5267; Downloads: 225
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130. Performance of the SST-1M telescope of the Cherenkov Telescope Array observatoryRafal Maderski, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, published scientific conference contribution Keywords: very-high energy (VHE) gamma-ray astronomy, Cherenkov Telescope Array (CTA), small-size telescopes (SST) for CTA, Davies-Cotton design
Published in RUNG: 08.11.2016; Views: 5499; Downloads: 247
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