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Search Results: 1 - 10 of 50526 matches for " Y. Koshio "
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The recent results of solar neutrino measurements in Super-Kamiokande
Y. Koshio
Physics , 2003,
Abstract: The results of solar neutrino data from the first phase of Super-Kamiokande are presented. Super-Kamiokande can measure not only the solar neutrino flux but also its energy spectrum and its time variations such as day vs night and seasonal differences. This information can severely restrict parameters of solar neutrino oscillation. From the combination of several experiments' results with those of Super-K, the Large Mixing Angle solution is uniquely allowed at the 98.1% confidence level; this global solar neutrino oscillation analysis is presented. The current status of the second phase of Super-Kamiokande is presented.
Other neutrino oscillation measurements
Koshio, Yusuke
High Energy Physics - Phenomenology , 2013,
Abstract: Neutrino oscillation results from several experiments and sources are discussed. Recent results from solar neutrino measurements by Super-Kamiokande and Borexino, atmospheric neutrino measurements from Super-Kamiokande, and accelerator neutrino measurements by MINOS and OPERA are the main topics of this document.
Other neutrino oscillation measurements
Yusuke Koshio
Physics , 2013,
Abstract: Neutrino oscillation results from several experiments and sources are discussed. Recent results from solar neutrino measurements by Super-Kamiokande and Borexino, atmospheric neutrino measurements from Super-Kamiokande, and accelerator neutrino measurements by MINOS and OPERA are the main topics of this document.
The Recent Results of the Solar Neutrino Measurement in Borexino
Yusuke Koshio,for the Borexino collaboration
Physics , 2011,
Abstract: The recent released results of 153.62 ton year exposure of solar neutrino data in Borexino are here discussed. Borexino is a multi-purpose detector with large volume liquid scintillator, located in the underground halls of the Laboratori Nazionali del Gran Sasso in Italy. The experiment is running since 2007. The first realtime 7Be solar neutrino measurement has been released in 2008. Thanks to the precise detector calibration in 2009, the 7Be flux measurement has been reached with an accuracy better than 5%. The result related to the day/night effect in the $^7$Be energy region is also discussed. These results validate the MSW-LMA model for solar neutrino oscillation.
Formation of Germanium-Carbon Core-Shell Nanowires by Laser Vaporization in High-Pressure Ar Gas without the Addition of Other Metal Catalysts  [PDF]
Kazuya Hatano, Yuuki Asano, Yuuto Kameda, Akira Koshio, Fumio Kokai
Materials Sciences and Applications (MSA) , 2017, DOI: 10.4236/msa.2017.812061
Abstract: Germanium (Ge)-carbon (C) core-shell nanowires (NWs), 15 - 80 nm thick and <1 μm long, were grown using continuous-wave laser vaporization of Ge-graphite composite targets in high pressure (0.1 - 0.9 MPa) Ar gas. The NW core was crystalline Ge and the shell was amorphous C. The fraction of the NWs in deposits was changed significantly by the Ge content in the targets and had a maximum at the Ge content of 40 atomic %. With increasing Ar pressure, thicker NWs were grown. A strong correlation was evident between the two diameters of the NW and nanoparticle (NP) attached with the tip of the NW. The growth of the NWs can be explained by the formation of Ge-C liquid-like molten NPs having a specific range of size and composition and precipitation of Ge and C followed by phase separation.
Scintillation-only Based Pulse Shape Discrimination for Nuclear and Electron Recoils in Liquid Xenon
K. Ueshima,K. Abe,K. Hiraide,S. Hirano,Y. Kishimoto,K. Kobayashi,Y. Koshio,J. Liu,K. Martens,S. Moriyama,M. Nakahata,H. Nishiie,H. Ogawa,H. Sekiya,A. Shinozaki,Y. Suzuki,A. Takeda,M. Yamashita,K. Fujii,I. Murayama,S. Nakamura,K. Otsuka,Y. Takeuchi,Y. Fukuda,K. Nishijima,D. Motoki,Y. Itow,K. Masuda,Y. Nishitani,H. Uchida,S. Tasaka,H. Ohsumi,Y. D. Kim,Y. H. Kim,K. B. Lee,M. K. Lee,J. S. Lee the XMASS Collaboration
Statistics , 2011, DOI: 10.1016/j.nima.2011.09.011
Abstract: In a dedicated test setup at the Kamioka Observatory we studied pulse shape discrimination (PSD) in liquid xenon (LXe) for dark matter searches. PSD in LXe was based on the observation that scintillation light from electron events was emitted over a longer period of time than that of nuclear recoil events, and our method used a simple ratio of early to total scintillation light emission in a single scintillation event. Requiring an efficiency of 50% for nuclear recoil retention we reduced the electron background to 7.7\pm1.1(stat)\pm1.2 0.6(sys)\times10-2 at energies between 4.8 and 7.2 keVee and to 7.7\pm2.8(stat)\pm2.5 2.8(sys)\times10-3 at energies between 9.6 and 12 keVee for a scintillation light yield of 20.9 p.e./keV. Further study was done by masking some of that light to reduce this yield to 4.6 p.e./keV, the same method results in an electron event reduction of 2.4\pm0.2(stat)\pm0.3 0.2(sys)\times10-1 for the lower of the energy regions above. We also observe that in contrast to nuclear recoils the fluctuations in our early to total ratio for electron events are larger than expected from statistical fluctuations.
Aplica??o da CLAE para determina??o do ácido 10-Hidróxi-2-decenóico (10-HDA) em geléia real pura e adicionada a mel brasileiro
Koshio, Shinnosuke;Almeida-Muradian, Ligia Bicudo de;
Química Nova , 2003, DOI: 10.1590/S0100-40422003000500009
Abstract: the aim of this paper was to determine the 10-hda in pure royal jelly and products containing royal jelly, using hplc methodology. 10-hda is the natural indicator of the presence of royal jelly in products and also gives the authenticity of pure royal jelly. the chromatographic conditions used were: isocratic system, c18-h column, auto sampler, diode array uv-vis detector (225 nm), mobile phase with methanol/water (45:55), ph= 2.5 and a-naphtol as internal standard. the results obtained using laboratory samples for pure royal jelly were 2.37%, varying from 0.15% for honey with 10% of royal jelly to 2.10% for honey with 90% of royal jelly respectivelly. for commercial products, the 10-hda content varied from no detectable to 0.026%. the recovery test presented a minumum of 100.44% the detection limit was 45.92 ng/ml and the quantification limit was 76.53 ng/ml.
Aplica o da CLAE para determina o do ácido 10-Hidróxi-2-decenóico (10-HDA) em geléia real pura e adicionada a mel brasileiro
Koshio Shinnosuke,Almeida-Muradian Ligia Bicudo de
Química Nova , 2003,
Abstract: The aim of this paper was to determine the 10-HDA in pure royal jelly and products containing royal jelly, using HPLC methodology. 10-HDA is the natural indicator of the presence of royal jelly in products and also gives the authenticity of pure royal jelly. The chromatographic conditions used were: isocratic system, C18-H column, auto sampler, diode array UV-VIS detector (225 nm), mobile phase with methanol/water (45:55), pH= 2.5 and a-naphtol as internal standard. The results obtained using laboratory samples for pure royal jelly were 2.37%, varying from 0.15% for honey with 10% of royal jelly to 2.10% for honey with 90% of royal jelly respectivelly. For commercial products, the 10-HDA content varied from no detectable to 0.026%. The recovery test presented a minumum of 100.44% The detection limit was 45.92 ng/mL and the quantification limit was 76.53 ng/mL.
Dietary Protein and Energy Requirements of Juvenile Japanese Flounder, Paralichthys olivaceus
Murat Yigit,Shunsuke Koshio,Shin-ichi Teshima,Manabu Ishikawa
Journal of Applied Sciences , 2004,
Abstract: Eight test diets of four protein (41, 44, 47 and 50%) and two energy levels (20 kJ g 1 and 19 kJ g 1) were formulated to investigate the proper dietary protein and energy levels for the growth of juvenile Japanese flounder, Paralichthys olivaceus. Squid liver oil concentration was used to adjust energy levels and brown fishmeal was used as the protein source. Weighing about 5.9 g, each duplicate group of flounder was fed test diets twice a day to apparent satiation, for 45 days. Performance of fish fed the different diets was evaluated for survival, percent weight gain, relative growth rate, feed efficiency and protein efficiency rate. Survival was over 85% for all treatments. Growth and feed efficiency of flounder increased as dietary protein increased in both energy levels of 19 kJ g 1 and 20 kJ g 1 diet, but no evidence of reaching a plateau for growth data was found. Lowest rates of cumulative ammonia nitrogen excretion as proportion of ingested nitrogen were recorded in fish fed the 50% protein-20 kJ g 1 and 50% protein-19 kJ g 1 diet (2.78 and 2.60%, respectively). The digestibility rates of the experimental diets with the high energy level (20 kJ g 1) were higher than those with the lower levels (19 kJ g 1). Digestion efficiencies in all experimental groups ranged from 89 to 92% for protein, from 60 to 85% for lipid and from 73 to 89% for energy, while those for the total digestibility ranged from 51 to 72%. The results indicate that Japanese flounder juveniles with 6 g mean weight need at least 50% dietary protein for best growth when brown fishmeal is the sole protein source. Furthermore, it can be concluded that Japanese flounder juveniles can utilize dietary energy up to 20 kJ g 1 efficiently, under the conditions applied in this study.
Self-shielding effect of a single phase liquid xenon detector for direct dark matter search
A. Minamino,K. Abe,Y. Ashie,J. Hosaka,K. Ishihara,K. Kobayashi,Y. Koshio,C. Mitsuda,S. Moriyama,M. Nakahata,Y. Nakajima,T. Namba,H. Ogawa,H. Sekiya,M. Shiozawa,Y. Suzuki,A. Takeda,Y. Takeuchi,K. Taki,K. Ueshima,Y. Ebizuka,A. Ota,S. Suzuki,H. Hagiwara,Y. Hashimoto,S. Kamada,M. Kikuchi,N. Kobayashi,T. Nagase,S. Nakamura,K. Tomita,Y. Uchida,Y. Fukuda,T. Sato,K. Nishijima,T. Maruyama,D. Motoki,Y. Itow,Y. D. Kim,J. I. Lee,S. H. Moon,K. E. Lim,J. P Cravens,M. B. Smy
Physics , 2009, DOI: 10.1016/j.astropartphys.2012.01.005
Abstract: Liquid xenon is a suitable material for a dark matter search. For future large scale experiments, single phase detectors are attractive due to their simple configuration and scalability. However, in order to reduce backgrounds, they need to fully rely on liquid xenon's self-shielding property. A prototype detector was developed at Kamioka Observatory to establish vertex and energy reconstruction methods and to demonstrate the self-shielding power against gamma rays from outside of the detector. Sufficient self-shielding power for future experiments was obtained.
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