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Journal Articles

Spin Seebeck mechanical force

Harii, Kazuya; Seo, Y.-J.*; Tsutsumi, Yasumasa*; Chudo, Hiroyuki; Oyanagi, Koichi*; Matsuo, Mamoru; Shiomi, Yuki*; Ono, Takahito*; Maekawa, Sadamichi; Saito, Eiji

Nature Communications (Internet), 10(1), p.2616_1 - 2616_5, 2019/06

 Times Cited Count:14 Percentile:83.38(Multidisciplinary Sciences)

Journal Articles

Fabrication and magnetic control of Y$$_3$$Fe$$_5$$O$$_{12}$$ cantilevers

Seo, Y.-J.*; Harii, Kazuya; Takahashi, Ryo*; Chudo, Hiroyuki; Oyanagi, Koichi*; Qiu, Z.*; Ono, Takahito*; Shiomi, Yuki*; Saito, Eiji

Applied Physics Letters, 110(13), p.132409_1 - 132409_4, 2017/03

 Times Cited Count:12 Percentile:63.51(Physics, Applied)

We have fabricated ferrite cantilevers in which their vibrational properties can be controlled by external magnetic fields. Submicron-scale cantilever structures were made from Y$$_3$$Fe$$_5$$O$$_{12}$$ films by physical etching combined with the use of a focused ion beam milling technique. We found that the cantilevers exhibit two resonance modes which correspond to horizontal and vertical vibrations. Under external magnetic fields, the resonance frequency of the horizontal mode increases, while that of the vertical mode decreases, quantitatively consistent with our numerical simulation for magnetic forces. The changes in resonance frequencies with magnetic fields reach a few percent, showing that an efficient magnetic control of resonance frequencies was achieved.

Journal Articles

Performance test of automatic analysis system of strontium-90 in environmental sample

Fujita, Hiroki; Nojima, Takehiro; Nagaoka, Mika; Osawa, Takahito; Yokoyama, Hiroya; Ono, Hironobu*

KEK Proceedings 2016-8, p.168 - 172, 2016/10

An automatic analysis system was developed to analyze Strontium-90 ($$^{90}$$Sr) radioactivity in environmental sample for 2013-2015. Various kinds of ashed environmental samples were used in performance tests of the automatic system. These tests were successful without any system trouble. However, $$^{90}$$Sr concentration had not been measured using the samples analyzed by the system. In this research, $$^{90}$$Sr concentration in seaweed sample was compared by between the system's analysis and worker's one. Moreover, the system was improved in each analysis process.

Journal Articles

Development of automatic analysis system of Strontium-90 in environmental sample

Nojima, Takehiro; Fujita, Hiroki; Nagaoka, Mika; Osawa, Takahito; Yokoyama, Hiroya; Ono, Hironobu*

KEK Proceedings 2015-4, p.111 - 115, 2015/11

Automatic strontium-90 analysis system was developed for environmental sample in this research. The system was successful to do wet ashing, chemical separation and ion exchange processes using robot, automatic heating system and so on. Hand-made control program can operate the system by itself.

Journal Articles

Development of special rotor for centrifugal separation of isotopes in solid pure metals

Ono, Masao; Sueyoshi, Masanori*; Okayasu, Satoru; Hao, T.; Esaka, Fumitaka; Osawa, Takahito; Iguchi, Yusuke*; Mashimo, Tsutomu

Review of Scientific Instruments, 80(8), p.083908_1 - 083908_6, 2009/08

 Times Cited Count:3 Percentile:18.97(Instruments & Instrumentation)

A prototype rotor with 2 grooves for the multi-stage centrifugal isotope separation in solid state was developed to test a new idea. This idea is based on the sedimentation of constitutional atoms in solid. In the performance test using indium specimen, it is verified that the developed rotor can receive all injected molten-indium droplets from an automatic raw-material feeding system even at the high rotational speed of 97,000 r.p.m. without the loss of rotational stability, and the received indium specimens can be transferred in/between 2 grooves through the plastic flow under the influence of strong centrifugal force even in the solid state. The isotope ratio of centrifuged indium specimens was analyzed employing the Secondary Ion Mass Spectrometry (SIMS), and it is confirmed that intended isotope separation by the centrifugation is realized in the solid state.

Journal Articles

Isotope fractionation due to sedimentation of atoms in centrifuged indium-lead alloy

Ono, Masao; Iguchi, Yusuke*; Okayasu, Satoru; Esaka, Fumitaka; Kobayashi, Katsura*; Hao, T.; Bagum, R.*; Osawa, Takahito; Fujii, Kimio; Nakamura, Eizo*; et al.

Defect and Diffusion Forum, 289-292, p.63 - 68, 2009/04

The atomic-scale graded structure of In-Pb alloy was formed by an ultracentrifuge experiment under conditions that a gravitational field of 0.81$$times$$10$$^{6}$$ G for 100 hours at 150 $$^{circ}$$C in solid state in our previous study. The isotope ratio measurements were performed on the centrifuged sample with secondary ion mass spectrometer (SIMS). $$^{206}$$Pb/$$^{208}$$Pb and $$^{207}$$Pb/$$^{208}$$Pb isotope ratio changed with negative gradient in the direction of centrifugal force approximately 1.5% and 0.8%, respectively. And three-isotope diagram of $$^{206}$$Pb/$$^{208}$$Pb versus $$^{207}$$Pb/$$^{208}$$Pb proved that the isotope fluctuation depends on isotopic mass difference. These results showed that the strong gravitational field not only affected on the inter-diffusion but also on self-diffusion in this alloy as causing isotope fractionation effect, and the isotope fractionation was dependent on mass-difference.

Journal Articles

Mass-dependent isotopic fractionation of a solid tin under a strong gravitational field

Osawa, Takahito; Ono, Masao; Esaka, Fumitaka; Okayasu, Satoru; Iguchi, Yusuke*; Hao, T.; Magara, Masaaki; Mashimo, Tsutomu

EPL; A Letters Journal Exploring the Frontiers of Physics, 85(6), p.64001_1 - 64001_5, 2009/03

 Times Cited Count:5 Percentile:39(Physics, Multidisciplinary)

Pure tin metals were centrifuged at 1$$times$$$$10^6$$ $$g$$ and at 220 $$^{circ}$$C for 100 hours, 0.40$$times$$$$10^6$$ $$g$$ at 220-230 $$^{circ}$$C for 24 hours, and 0.25$$times$$$$10^6$$ $$g$$ at 220 $$^{circ}$$C for 24 hours. Their isotopic compositions were measured by a secondary ion mass spectrometer (SIMS). $$^{116}$$Sn/$$^{120}$$Sn and $$^{124}$$Sn/$$^{120}$$Sn ratios of the 1.02$$times$$$$10^6$$ $$g$$ sample were considerably different than the initial compositions, and the magnitude of isotopic fractionation reached 2.6%. A three-isotope diagram of $$^{116}$$Sn/$$^{120}$$Sn versus $$^{124}$$Sn/$$^{120}$$Sn shows conclusively that isotopic fractionation caused by a gravitational field depended only on isotopic mass.

Journal Articles

Isotope fluctuation in indium-lead alloy induced by solid centrifugation

Ono, Masao; Iguchi, Yusuke*; Okayasu, Satoru; Esaka, Fumitaka; Kobayashi, Katsura*; Hao, T.; Bagum, R.*; Osawa, Takahito; Fujii, Kimio; Nakamura, Eizo*; et al.

Journal of Nuclear Science and Technology, 45(Suppl.6), p.108 - 110, 2008/09

 Times Cited Count:1 Percentile:10.92(Nuclear Science & Technology)

The atomic-scale graded structure of In-Pb alloy was formed by an ultracentrifuge experiment under conditions that a gravitational field of 810,000 G for 100 hours at 150$$^{circ}$$C (solid state) in our previous study. The isotope fluctuation on this sample was measured using secondary ion mass spectrometer (SIMS). The ratio both $$^{208}$$Pb/$$^{206}$$Pb and $$^{115}$$In/$$^{113}$$In changed with positive gradient in the direction of centrifugal force approximately 1.2%. These isotope fluctuations were larger than that of starting state of natural state (In$$<$$0.2%, Pb$$<$$0.1%). These show that the sedimentation of isotopes occurred by solid centrifugation in this alloy, although achieved concentration gradients were small.

Oral presentation

Isotope fractionation due to sedimentation of atoms in centrifuged indium-lead alloy

Ono, Masao; Iguchi, Yusuke*; Okayasu, Satoru; Esaka, Fumitaka; Kobayashi, Katsura*; Hao, T.; Bagum, R.*; Osawa, Takahito; Fujii, Kimio; Nakamura, Eizo*; et al.

no journal, , 

The atomic-scale graded structure of In-Pb alloy was formed by an ultracentrifuge experiment under conditions that a gravitational field of 0.81$$times$$10$$^{6}$$G for 100 hours at 150 $$^{circ}$$C in solid state in our previous study. The isotope ratio measurements were performed on the centrifuged sample with secondary ion mass spectrometer (SIMS, CAMECA IMS-6f). Both $$^{115}$$In/$$^{113}$$In and $$^{208}$$Pb/$$^{206}$$ isotope ratio changed with negative gradient in the direction of centrifugal force approximately 1.2% showing the tendency that the heavy $$^{115}$$In isotope ($$^{208}$$Pb isotope) abundance increased and light $$^{113}$$In isotope ($$^{206}$$Pb isotope) abundance decreased in the direction of centrifugal force. This showed that the isotope fractionation effect due to sedimentation of atoms occurred in this alloy by ultracentrifuge experiment.

Oral presentation

Isotopic fractionation of tin under extremely strong centrifugal force field

Osawa, Takahito; Ono, Masao; Esaka, Fumitaka; Okayasu, Satoru; Iguchi, Yusuke*; Hao, T.; Mashimo, Tsutomu

no journal, , 

Pure tin metals were centrifuged at 1,0200,000G and at 220$$^{circ}$$C for 100 hours, 400,000 G at 220-230$$^{circ}$$C for 24 hours, and 250,000G at 220$$^{circ}$$C for 24 hours. Their isotopic compositions were measured by a secondary ion mass spectrometer (SIMS). 116Sn/120Sn and 124Sn/120Sn ratios of the 1,0200,000G sample were considerably different than the initial compositions, and the magnitude of isotopic fractionation reached 2.6%. A three-isotope diagram of 116Sn/120Sn versus 124Sn/120Sn shows conclusively that isotopic fractionation caused by a gravitational field depended on isotopic mass.

Oral presentation

Centrifugal isotope separation in solid or liquid

Ono, Masao; Hao, T.; Okayasu, Satoru; Esaka, Fumitaka; Osawa, Takahito; Iguchi, Yusuke*; Mashimo, Tsutomu

no journal, , 

no abstracts in English

Oral presentation

Isotopic fractionation of a solid tin under a ultra-strong centrifugal force field

Osawa, Takahito; Ono, Masao; Esaka, Fumitaka; Okayasu, Satoru; Mashimo, Tsutomu*

no journal, , 

no abstracts in English

Oral presentation

Separation of noble gas carrier in primitive meteorites using ultra centrifugation

Osawa, Takahito; Nagao, Keisuke*; Ono, Masao

no journal, , 

Primordial trapped noble gas component in primitive chondrites is concentrated in phase Q. We tried to separate phase Q from a carbonaceous chondrite using ultra-centrifugation. Noble gases are concentrated in a heavy fraction, showing that phase Q may be heavy carbonaceous materials or heavy particles attached to carbonaceous materials.

Oral presentation

Progress in design study of ITER poloidal polarimeter

Kawano, Yasunori; Imazawa, Ryota; Ono, Takehiro; Ishikawa, Masao; Hayashi, Toshimitsu; Sato, Kazuyoshi; Kusama, Yoshinori; Ebisawa, Katsuyuki*; Wakabayashi, Kuniaki*; Katsumata, Takahito*

no journal, , 

no abstracts in English

Oral presentation

Isotopic fractionation of a solid tin under a ultra-strong centrifugal force field

Osawa, Takahito; Ono, Masao; Esaka, Fumitaka; Okayasu, Satoru; Mashimo, Tsutomu*

no journal, , 

no abstracts in English

Oral presentation

Development of automatic analysis system of Strontium-90 in environmental sample

Nojima, Takehiro; Fujita, Hiroki; Nagaoka, Mika; Osawa, Takahito; Yokoyama, Hiroya; Ono, Hironobu*

no journal, , 

An automatic analysis system was developed to analyze radioactive strontium ($$^{90}$$Sr) radioactivity in environmental sample. The analysis method was followed to the manual compiled by the MEXT, to determine low level of $$^{90}$$Sr radioactivity concentration in environmental sample. In this research, the procedure of the Sr analysis before milking procedure of $$^{90}$$Y was automated except for a part of the analysis. The systems were controlled by an original program under the LabVIEW. Various kinds of ashed environmental samples were used in performance tests of the automatic system. These tests were successful without system trouble. Finally, Sr recovery was about 40-70% to whitebait analysis.

Oral presentation

Isotope fractionation in AgI super-ionic conductor by centrifugation

Ono, Masao; Okayasu, Satoru; Iguchi, Yusuke*; Esaka, Fumitaka; Ishitsuka, Etsuo; Osawa, Takahito; Ogata, Yudai; Mashimo, Tsutomu*

no journal, , 

Oral presentation

Application of automatic analysis system of Strontium-90 to analysis of environmental sample

Fujita, Hiroki; Nojima, Takehiro*; Nagaoka, Mika; Osawa, Takahito; Ono, Hironobu*

no journal, , 

no abstracts in English

Oral presentation

Detection of spin wave spin currents by using a ferrimagnetic cantilever

Harii, Kazuya; Seo, Y.-J.*; Tsutsumi, Yasumasa*; Chudo, Hiroyuki; Oyanagi, Koichi*; Matsuo, Mamoru*; Shiomi, Yuki*; Ono, Takahito*; Maekawa, Sadamichi; Saito, Eiji

no journal, , 

no abstracts in English

Oral presentation

Transport and accumulation of particulate $$^{137}$$Cs on the continental shelf off Fukushima

Otosaka, Shigeyoshi*; Misono, Toshiharu; Dohi, Terumi; Tsuruta, Tadahiko; Takahashi, Yoshio*; Sugihara, Naoko*; Obata, Hajime*; Ikenoue, Takahito*; Jimi, Naoto*; Hookabe, Natsumi*

no journal, , 

no abstracts in English

20 (Records 1-20 displayed on this page)
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