Morphological reproductive characteristics of testes and fertilization capacity of cryopreserved sperm after the Fukushima accident in raccoon ()

Komatsu, Kazuki*; Iwasaki, Tsugumi*; Murata, Kosuke*; Yamashiro, Hideaki*; Goh, V. S. T.*; Nakayama, Ryo*; Fujishima, Yohei*; Ono, Takumi*; Kino, Yasushi*; Shimizu, Yoshinaka*; et al.

Reproduction in Domestic Animals, 56(3), p.484 - 497, 2021/03

https://doi.org/10.1111/rda.13887

We have established an archive system of livestock and wild animals from the surrounding ex-evacuation zone. Wildlife within the alert zone have been exposed to low-dose-rate (LDR) radiation for a long and continuous time. In this study, we analysed the morphological characteristics of the testes and in vitro fertilization (IVF) capacity of cryopreserved sperm of raccoons from the ex-evacuation zone of the FDNPP accident. This study revealed that the chronic and LDR radiation exposure associated with the FDNPP accident had no adverse effect on the reproductive characteristics and functions of male raccoons.

Coexisting spin resonance and long-range magnetic order of Eu in EuRbFeAs

Iida, Kazuki*; Nagai, Yuki; Ishida, Shigeyuki*; Ishikado, Motoyuki*; Murai, Naoki; Christianson, A. D.*; Yoshida, Hiroyuki*; Inamura, Yasuhiro; Nakamura, Hiroki; Nakao, Akiko*; et al.

Physical Review B, 100(1), p.014506_1 - 014506_8, 2019/07

https://doi.org/10.1103/PhysRevB.100.014506

Magnetic excitations and magnetic structure of EuRbFeAs were investigated by neutron scattering measurements.

Estimation of radiocesium dietary intake from time series data of radiocesium concentrations in sewer sludge

Pratama, M. A.; Takahara, Shogo; Munakata, Masahiro; Yoneda, Minoru*

Environment International, 115, p.196 - 204, 2018/06

https://doi.org/10.1016/j.envint.2018.03.009

Northern Hemisphere forcing of climatic cycles in Antarctica over the past 360,000 years

Kawamura, Kenji*; Parrenin, F.*; Lisiecki, L.*; Uemura, Ryu*; Vimeux, F.*; Severinghaus, J. P.*; Hutterli, M. A.*; Nakazawa, Takakiyo*; Aoki, Shuji*; Jouzel, J.*; et al.

Nature, 448(7156), p.912 - 916, 2007/08

https://doi.org/10.1038/nature06015

We present a new chronology of Antarctic climate change over the past 360,000 years that is based on the ratio of oxygen to nitrogen molecules in air trapped in the Dome Fuji and Vostok ice cores. This ratio is a proxy for local summer insolation, and thus allows the chronology to be constructed by orbital tuning without the need to assume a lag between a climate record and an orbital parameter. The accuracy of the chronology allows us to examine the phase relationships between climate records from the ice cores and changes in insolation. Our results indicate that orbital-scale Antarctic climate change lags Northern Hemisphere insolation by a few millennia, and that the increases in Antarctic temperature and atmospheric carbon dioxide concentration during the last four terminations occurred within the rising phase of Northern Hemisphere summer insolation. These results support the Milankovitch theory that Northern Hemisphere summer insolation triggered the last four deglaciations.

Time-dependent behaviour analysis and identification of factors affecting radiocaesium transfer to separate sewers in Fukushima Prefecture

Pratama, M. A.; Takahara, Shogo; Munakata, Masahiro; Yoneda, Minoru*

no journal, , 

Design of LPCE column for performance tests on tritium separation with TLK facility

Sugiyama, Takahiko*; Yamanishi, Toshihiko; Munakata, Kenzo*; Asakura, Yamato*; Yamamoto, Ichiro*; Glugla, M.*

no journal, , 

We report a design of the column interior which was designed to fit into the existing facility dedicated for LPCE process characterization (under the limitation of the TLK facility). The experimental conditions such as liquid and gas flow-rates, temperature have been established during preliminary investigations carried out at Nagoya University. The column to be used in the TLK facility is stainless steel tube with 55 mm internal diameter and 2 m length. The tritium separation experiments are performed at 120 kPa, 343 K. A stage-wise model was also developed to predict separative performance of the column. This model requires the channeling coefficients. The channeling coefficient which represents axial dispersion of the packed bed is evaluated against flow rates of water by impulse response. Analytical results with the present model present effects of the catalysis quantity and the gas-liquid ratio on separative performances of the column.

Neutron scattering study on A phase and its anisotropy in EuPtSi

Kaneko, Koji; Tabata, Chihiro*; Oishi, Kazuki*; Ito, Takashi; Nakao, Hironori*; Frontzek, M. D.*; Matsuda, Masaaki*; Munakata, Koji*; Nakao, Akiko*; Ohara, Takashi; et al.

no journal, , 

no abstracts in English

Time-dependence of radiocesium concentration in separate sewer sludge; A New method to estimate the ingestion intake of cesium

Pratama, M. A.; Takahara, Shogo; Munakata, Masahiro; Homma, Toshimitsu; Yoneda, Minoru*

no journal, , 

Magnetic skyrmion lattice in Eu-based trillium lattice compound EuPtX (X=Si, Ge)

Kaneko, Koji; Tabata, Chihiro*; Takeuchi, Tetsuya*; Frontzek, M. D.*; Matsuda, Masaaki*; Oishi, Kazuki*; Ito, Takashi; Munakata, Koji*; Kiyanagi, Ryoji; Kakihana, Masashi*; et al.

no journal, , 

Magnetic skyrmion lattice in cubic -electron magnet EuPtSi

Kaneko, Koji; Tabata, Chihiro*; Takeuchi, Tetsuya*; Frontzek, M. D.*; Matsuda, Masaaki*; Oishi, Kazuki*; Ito, Takashi; Munakata, Koji*; Kiyanagi, Ryoji; Kakihana, Masashi*; et al.

no journal, ,