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Spiral spin structures and origin of the magnetoelectric coupling inYMn2O5
Kim, J.-H.,Lee, S.-H.,Park, S. I.,Kenzelmann, M.,Harris, A. B.,Schefer, J.,Chung, J.-H.,Majkrzak, C. F.,Takeda, M.,Wakimoto, S.,Park, S. Y.,Cheong, S-W.,Matsuda, M.,Kimura, H.,Noda, Y.,Kakurai, K. American Physical Society 2008 Physical review. B, Condensed matter and materials Vol.78 No.24
XMASS Collaboration,Takiya, H.,Abe, K.,Hiraide, K.,Ichimura, K.,Kishimoto, Y.,Kobayashi, K.,Kobayashi, M.,Moriyama, S.,Nakahata, M.,Norita, T.,Ogawa, H.,Sekiya, H.,Takachio, O.,Takeda, A.,Tasaka, S.,Y North-Holland 2016 Nuclear Instruments & Methods in Physics Research. Vol.834 No.-
We report the measurement of the emission time profile of scintillation from gamma-ray induced events in the XMASS-I 832kg liquid xenon scintillation detector. Decay time constant was derived from a comparison of scintillation photon timing distributions between the observed data and simulated samples in order to take into account optical processes such as absorption and scattering in liquid xenon. Calibration data of radioactive sources, <SUP>55</SUP>Fe, <SUP>241</SUP>Am, and <SUP>57</SUP>Co were used to obtain the decay time constant. Assuming two decay components, τ<SUB>1</SUB> and τ<SUB>2</SUB>, the decay time constant τ<SUB>2</SUB> increased from 27.9ns to 37.0ns as the gamma-ray energy increased from 5.9keV to 122keV. The accuracy of the measurement was better than 1.5ns at all energy levels. A fast decay component with τ<SUB>1</SUB>~2ns was necessary to reproduce data. Energy dependencies of τ<SUB>2</SUB> and the fraction of the fast decay component were studied as a function of the kinetic energy of electrons induced by gamma-rays. The obtained data almost reproduced previously reported results and extended them to the lower energy region relevant to direct dark matter searches.
Isolation of Polyacrylamide-degrading Microorganisms from Soil
H. Matsuoka,F. Ishimura,T. Takeda,M. Hikuma 한국생물공학회 2002 Biotechnology and Bioprocess Engineering Vol.7 No.5
Two polyacrylamide-degrading bacterial strains, No. 2 and No. 11, were isolated from soil,and identified as Bacillus sphaericus No.2 and Acinetobacter sp. No. 11, respectively. Both strains grew on medium containing polyacrylamide as sole carbon and nitrogen sources. B. sphaericus No. 2 and A. sp. No. 11 reduced by 16% and 19% of the initial polyacrylamide concentration, respectively. Optimal pH and temperature in growth of Acinetobacter sp. No. 11 were 8.0 and 37C, respectively. After 14-day cultivation of A. sp. No. 11, the average molecular weight of polyacrylamide has been shifted from 2.3 106to 0.5 106.
Isolation of Polyacrylamide-degrading Microorganisms from Soil
Matsuoka, H.,Ishimura, F.,Takeda, T.,Hikuma, M. The Korean Society for Biotechnology and Bioengine 2002 Biotechnology and Bioprocess Engineering Vol.7 No.5
Two polyacrylamide degrading bacterial strains, No. 2 and No. 11, were isolated from soil, and identified as Bacillus sphaericus No.2 and Acinetobacter sp. No. 11, respectively. Both strains grew on medium containing polyacrylamide as sole carbon and nitrogen sources. B. sphaericus No. 2 and A. sp. No. 11 reduced by 16% and 19%of the initial polyacrylamide concentration, respectively. Optimal pH and temperature in growth of Acinetobacter sp. No. 11 were 8.0 and $37^{\circ}C$, respectively. After 14-day cultivation of A. sp. No. 11, the average molecular weight of polyacrylamide has been shifted from $2.3{\times}10^6\;to\;0.5{\time}106$.
Groundwater supply under land subsidence constrains in the Nobi Plain
Adrian H. Gallardo,Atsunao Marui,Shinji Takeda,Fumio Okuda 한국지질과학협의회 2009 Geosciences Journal Vol.13 No.2
Groundwater overdraft resulted in land subsidence throughout the Nobi Plain, central Japan. To cope with the growing water demand in the region, a numerical model was used to determine the maximum withdrawal capacity of two confined aquifers without causing undesirable consequences. Results were validated against field data and by analytical solutions. The analysis focused in Aburashima, a site expected to experience a rapid development in the forthcoming years. Calculations showed the water availability in the upper aquifer is limited. Moreover, seasonal fluctuations in heads reduce its extraction capacity up to 44%. In contrast, storage is substantially higher in the deep aquifer. Larger quantities and lower extraction costs make this layer a more reliable source for water supply. Findings from this study will be used by authorities to update the current legislation on groundwater abstraction. Nevertheless, it is argued that to achieve a long-term sustainability, policies should not limit solely to control regulations but also to economical strategies and the expansion of the infrastructure system.