論文 - 野村　直希

Investigation on high gradient magnetic separation for CRUD material in nuclear reactor 査読

S. Nishijima, N. Nomura, F. Mishima, T. Sekine

Progress in Superconductivity and Cryogenics   26 ( 3 )   8 - 11   2024年9月

Research and development of new magnetic filter for high gradient magnetic separation 査読

S. Nishijima, F. Mishima, N. Nomura

Progress in Superconductivity and Cryogenics   25 ( 3 )   1 - 6   2023年9月

Study on multi-stage magnetic separation device for paramagnetic materials operated in low magnetic fields 査読

F. Mishima, A. Nagahama, N. Nomura, S. Nishijima

Progress in Superconductivity and Cryogenics   25 ( 3 )   13 - 17   2023年9月

Separation of micro-plastics from sea water using electromagnetic archimedes force 査読

N. Nomura, F. Mishima, S. Nishijima

Progress in Superconductivity and Cryogenics   25 ( 3 )   13 - 17   2023年9月

Development of novel magnetic filter for paramagnetic particles in high gradient magnetic 査読

S.Nishijima, N.Nomura

Progress in Superconductivity and Cryogenics   24 ( 3 )   2022年9月

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We are conducting research and development of magnetic filters for magnetic separation targeting paramagnetic materials. In order to develop a new magnetic filter with a large magnetic gradient, stainless fiber (SUS430, 120 mm x 3 mm) with a triangular cross section was sintered with a high void ratio (～70%) and the magnetic filter (20 mm x 2 mm) was created. When this magnetic filter was used to perform magnetic separation of hematite (particle size 50 μm) under a maximum magnetic flux density of 1.49 T, high separation rates were obtained.

Magnetic separation device for paramagnetic materials operated in a low magnetic field 査読 国際誌

F.Mishima, N.Nomura, S.Nishijima

Progress in Superconductivity and Cryogenics   24 ( 3 )   2022年9月

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We have been developing a magnetic separation device that can be used in low magnetic fields for paramagnetic materials. Magnetic separation of paramagnetic particles with a small particle size is desired for volume reduction of contaminated soil in Fukushima or separation of iron scale from water supply system in power plants. However, the implementation of the system has been difficult due to the needed magnetic fields is high for paramagnetic materials. This is because there was a problem in installing such a magnet in the site. Therefore, we have developed a magnetic separation system that combines a selection tube and magnetic separation that can separate small sized paramagnetic particles in a low magnetic field. The selection tube is a technique for classifying the suspended particles by utilizing the phenomenon that the suspended particles come to rest when the gravity acting on the particles and the drag force are balanced when the suspension is flowed upward. In the balanced condition, they can be captured with even small magnetic forces. In this study, we calculated the particle size of paramagnetic particles trapped in a selection tube in a high gradient magnetic field. As a result, the combination of the selection tube and HGMS (High Gradient Magnetic Separation-system) can separate small sized paramagnetic particles under low magnetic field with high efficiency, and this paper shows its potential application.

Development of novel magnetic separation for paramagnetic particles using the selection tube 査読 国際誌

N.Nomura, F.Mishima, S.Nishijima

IEEE Transactions on Applied Superconductivity   32 ( 6 )   2022年9月

Study of microp-plastics separation from sea water with electro-magnetic force 査読 国際誌

N.Nomura, F.Mishima, S.Nishijima

IEEE Transaction on Applied Superconductivity   32 ( 6 )   2022年9月

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The method of removing micro-plastics from sea water has been developed using electro-magnetic force. Plastics are difficult to decompose and put a great load on the marine environment. Especially a plastic with a size of 5mm or less is defined as micro-plastics and are carried by ocean currents over long distances, causing global pollution. These are not easily decomposed in the natural environment. The Lorentz force was generated in simulated sea water and its reaction force was applied to the micro-plastic to control their motion. The basic principle of this separation method has already been confirmed by basic experiments. In this study, the magnetic field and current density required to treat seawater containing micro-plastics using a superconducting magnet with a bore diameter of 5cm were investigated by simulation. Plastic particles with a diameter of more than 200 μm were targeted for separation, and various conditions for separation were investigated by simulation. As a result, it was shown that good separation efficiency was obtained under the following conditions: flow velocity of 0.2m/s, electrode size of 150mm, current density of 0.93A/cm2, and applied magnetic field of 3T.

ローレンツ力を用いた海水中マイクロプラスチックの分離

野村 直希 三島 史人 西嶋 茂宏

2022年1月11日金属・セラミックス/超電導機器合同研究会   2022年1月

Review of engagement activities to promote awareness of radiation and its associated risk amongst the Japanese public before and after the Fukushima Daiichi Nuclear Power Plant accident 査読

Akihiro Sakoda1,∗, Naoki Nomura2, Yujiro Kuroda3,4, Takahiko Kono5, Wataru Naito6 and Hiroko Yoshida7

Journal of Radiological Protection   41   1258 - 1287   2021年11月

Study of micro-plastics separation from sea water with electro-magnetic force 査読

Naoki Nomura*, Fumihito Mishima, and Shigehiro Nishijima

Progress in Superconductivity and Cryogenics   23 ( 3 )   10 - 13   2021年9月

超電導高勾配磁気分離のセシウム汚染土壌減容への適用可能性 招待 査読

秋山 庸子, 野村 直希, 三島 史人, 西嶋 茂宏

低温工学   55 ( 3 )   172 - 178   2020年5月

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福島汚染土壌の減容化に超電導高勾配磁気分離システムが応用可能であることを解説した。

化学的動態制御と物理的処理を組み合わせた有害物質 除去に関する研究

野村直希

2017年3月

Csの物理的・化学的移行による土壌の減容化に関する研究 査読

野村 直希 関谷一輝　三島 史人 秋山庸子　西嶋 茂宏

環境放射能除染学会誌   4 ( 4 )   337 - 346   2016年

Study on Decontamination of Contaminated Soils by Magnetic Separation”, IEEE Transactions on Applied Superconductivity 査読

Kazuki Sekiya , Hiroki Kuwahara , Yuki Yoshida , Susumu Igarashi , Naoki Nomura , Fumihito Mishima , Yoko Akiyama , Shigehiro Nishijima

IEEE Transactions on Applied Superconductivity   2014年

Fundamental Study on Removal of Arsenic by Magnetic Separation 査読

Naoki Nomura ; Fumihito Mishima ; Yoko Akiyama ; Shigehiro Nishijima

IEEE Transactions on Applied Superconductivity   2012年