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Study of micro-plastics separation from sea water with electro-magnetic force
Naoki Nomura,Fumihito Mishima,Shigehiro Nishijima 한국초전도저온공학회 2021 초전도와 저온공학 Vol.23 No.3
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 5 mm or less is defined as micro-plastic 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. Lorentz force was generated downward and the reaction force to the plastics was upward. The plastic used in the experiment was polystyrene with a diameter of 6 mm, and the density was 1.07 g/cm3. The polystyrene sphere levitated at the current density of 0.83 A/cm2 and the external field of 0.87T. The particle trajectory calculation was also made to design separation system using superconducting magnet.
Study of micro-plastics separation from sea water with electro-magnetic force
Nomura, Naoki,Mishima, Fumihito,Nishijima, Shigehiro The Korean Society of Superconductivity and Cryoge 2021 한국초전도저온공학회논문지 Vol.23 No.3
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 5 mm or less is defined as micro-plastic 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. Lorentz force was generated downward and the reaction force to the plastics was upward. The plastic used in the experiment was polystyrene with a diameter of 6 mm, and the density was 1.07 g/cm<sup>3</sup>. The polystyrene sphere levitated at the current density of 0.83 A/cm<sup>2</sup> and the external field of 0.87T. The particle trajectory calculation was also made to design separation system using superconducting magnet.
Development of novel magnetic filter for paramagnetic particles in high gradient magnetic separation
Nishijima, Shigehiro,Nomura, Naoki The Korean Society of Superconductivity and Cryoge 2022 한국초전도저온공학회논문지 Vol.24 No.3
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 × 3 mm) with a triangular cross section was sintered with a high void ratio (~ 70%) and the magnetic filter (20 mm × 2 mm) was created. When this magnetic filter was used to perform magnetic separation of hematite (particle size 50 ㎛) under a maximum magnetic flux density of 1.49 T, high separation rates were obtained.
Research and development of new magnetic filter for high gradient magnetic separation
Shigehiro Nishijima,Naoki Nomura,Fumihito Mishima 한국초전도저온학회 2023 한국초전도저온공학회논문지 Vol.25 No.3
We have been developing a new magnetic filter so that small sized paramagnetic substances can be separated even in a low magnetic field (lower than 2T). The developed filter is a packed ferromagnetic filament with a triangular cross section. The filament has a diameter of 120 μm and a length of 3 mm, and is mechanically packed with a volume ratio of 17.6%. Using this filter, a magnetic separation experiment of hematite was carried out using a superconducting magnet at the field of 2T. Similarly, magnetic separation was performed using a conventional magnetic filter. It became clear that the separation efficiency of newly developed filter is high as that of conventional mesh filter. The smaller sized hematite (<3μm) could be separated though conventional mesh filter could not separate.
Development of volume reduction method of cesium contaminated soil with magnetic separation
Yukumatsu, Kazuki,Nomura, Naoki,Mishima, Fumihito,Akiyama, Yoko,Nishijima, Shigehiro The Korea Institute of Applied Superconductivity a 2016 한국초전도저온공학회논문지 Vol.18 No.1
In this study, we developed a new volume reduction technique for cesium contaminated soil by magnetic separation. Cs in soil is mainly adsorbed on clay which is the smallest particle constituent in the soil, especially on paramagnetic 2:1 type clay minerals which strongly adsorb and fix Cs. Thus selective separation of 2:1 type clay with a superconducting magnet could enable to reduce the volume of Cs contaminated soil. The 2:1 type clay particles exist in various particle sizes in the soil, which leads that magnetic force and Cs adsorption quantity depend on their particle size. Accordingly, we examined magnetic separation conditions for efficient separation of 2:1 type clay considering their particle size distribution. First, the separation rate of 2:1 type clay for each particle size was calculated by particle trajectory simulation, because magnetic separation rate largely depends on the objective size. According to the calculation, 73 and 89 % of 2:1 type clay could be separated at 2 and 7 T, respectively. Moreover we calculated dose reduction rate on the basis of the result of particle trajectory simulation. It was indicated that 17 and 51 % of dose reduction would be possible at 2 and 7 T, respectively. The difference of dose reduction rate at 2 T and 7 T was found to be separated a fine particle. It was shown that magnetic separation considering particle size distribution would contribute to the volume reduction of contaminated soil.
IS THE EFFECT OF LUXURY ADVERTISING ON CONSUMER EVALUATIONS OF FASHION BRANDS POSITIVE OR NEGATIVE?
Akinori Ono,Yuka Eguro,Taichi Narisawa,Naoki Nomura,Takaya Sato,Yuna Sato,Yuta Shibamoto,Soichiro Yoshida 글로벌지식마케팅경영학회 2017 Global Fashion Management Conference Vol.2017 No.07
Some clothing manufacturers and retailers use attractive endorsers on their advertising. However, according to recent research, consumers with low body esteem evaluate the clothing items more negatively when they try them on in the fitting room and find that they are inferior to the attractive advertising endorser wearing the same items (Dahl, Argo, & Morales, 2012). Is it always true? Should clothing companies not use attractive endorsers? When Dahl, et al. (2012) emphasized the negative impact of an attractive endorser and discussed body esteem, they implicitly assumed body-related consumption, in which consumers wear clothing items to enrich their physical appearance. However, other research on fashion has suggested that consumers often wear clothing items for self-expression (e.g., Piacentiti & Malier, 2004). Luxury fashion brands have been particularly regarded as symbols of wealth, so consumers wear luxury fashion clothing items to show off their high status (Shavitt, 1989; Wilcox, Kim & Sen, 2009). Thus, status-related consumption should be considered in addition to body-related consumption. Considering status-related consumption, this research introduces another kind of self-esteem, i.e., status esteem, which refers to how confident consumers are in their status. Assuming that there are two types of self-esteem, body esteem (or external esteem) and status esteem (or internal esteem), both of which are related to clothing, we hypothesize that consumers low in status esteem will evaluate a status-related product more positively than consumers high in status esteem when their consumption aligns (vs. when it does not align) with an attractive endorser even though they are low in body esteem. To test the hypothesis, we conducted three laboratory experiments. The result of multiple regression analysis showed that our hypothesis was supported. By suggesting that even consumers with low body and status esteem can evaluate status-related product positively, when finding that they are inferior to the advertising endorser in terms of body, this research expands our understanding on how attractive advertising endorsers affect consumer evaluation of clothing items focusing on two kinds of selfesteem, body and status esteem.