著者
板岡 健之 木村 誠一郎 広瀬 雄彦 吉田 謙太郎
出版者
一般社団法人 エネルギー・資源学会
雑誌
エネルギー・資源学会論文誌 (ISSN:24330531)
巻号頁・発行日
vol.40, no.6, pp.242-249, 2019 (Released:2019-11-11)
参考文献数
10

In response to the introduction of fuel cell vehicles (FCVs) to the commercial market hydrogen station deployment needs to be progressed. Since resources allocated for deployment are limited for either private companies who wish to install stations and governments who provide subsidies, efficient station allocation should be cognizant of the service of potential customers. Based on a literature review, the results of a social survey and data analysis, p-median is chosen to find optimum locations for hydrogen stations. Location and the amount on potential demand for FCV’s in the early stage of deployment is estimated by a regression model. The result of GIS analysis for short mid-term perspective using p-median implies the importance of covering regional hub cities (such as prefectural capital cities) as well as metropolises and the result of GIS analysis for long-term perspective implies the ultimate necessary deployment of hydrogen stations. The locations suggested by the analysis were examined through coverage analysis on existing gasoline stations. The geographical tendency of station locations allocated by the developed methodology provides guidance for hydrogen station location practice.
著者
吉田 剛 大城 敬人 鷹合 孝之 谷口 正輝 鷲尾 隆
出版者
一般社団法人 人工知能学会
雑誌
人工知能学会全国大会論文集 第31回全国大会(2017)
巻号頁・発行日
pp.2I3OS10a3, 2017 (Released:2018-07-30)

一分子計測技術に期待が高まっている.ただし計測には常にノイズ混入という問題がつきまとい,これはナノスケールにおいて非常に顕著となる.我々はPU Classificationを用いてノイズのみデータを学習することで,実測データからノイズのみを除去し試料データを適切に取得することを試みた.特に研究開発中の一分子DNAシーケンサに応用した.このノイズ除去効果の有無による識別精度の差異について報告する.
著者
中島 涼輔 吉田 茂生
雑誌
JpGU-AGU Joint Meeting 2020
巻号頁・発行日
2020-03-13

Magnetohydrodynamic (MHD) shallow water linear waves are investigated over a rotating sphere with an imposed equatorially antisymmetric toroidal magnetic field: B0Φ=B0sinθcosθ, where B0 is a constant, θ is the colatitude and Φ is the azimuth. This system can imitatively represent the dynamics of a liquid metal within a stably stratified layer at the top of the Earth's core, which was detected through seismological surveys (e.g. Helffrich & Kaneshima, 2010[1]) and also has been deduced from geophysical and geochemical knowledge (e.g. Buffett & Seagle, 2010[2]; Pozzo et al., 2012[3]; Gubbins & Davies, 2013[4]; Brodholt & Badro, 2017[5]). Because slowly propagating waves in the liquid core can result in geomagnetic secular variations, comparison between exhaustive studies of MHD waves in a rotating stratified fluid and observations of geomagnetic fluctuations should provide constraints on the obscure stratified layer in the outermost core (e.g. Braginsky, 1993[6]; Buffett, 2014[7]).The adopted configuration of the background field complicates solving the eigenvalue problem of linear waves due to the emergence of an Alfvén continuum and critical latitudes unless dissipation effects are taken into account. These result from non-dissipative Alfvén resonance, which occurs only when B0Φ/sinθ depends on θ, that is, regular singular points appear in the differential equation of linear problems. The solutions of the continuum are required to express the transient evolution of an arbitrary initial disturbance (e.g. Case, 1960[8]; Goedbloed & Poedts, 2004[9]). We can confirm numerically and analytically that introducing magnetic diffusion eliminates these Alfvén continuous modes and their singular structures around critical latitudes (Nakashima, Ph.D. thesis, 2020[10]).For the Earth's core-like parameter (B0≃0.5—5mT and magnetic diffusivity η≃1m2/s), westward polar trapped modes are obtained as eigenmodes, which have a period of around from several to 1000 years. We may be able to observe these modes as geomagnetic secular variations in high latitude regions, if the strength of stratification in the stratified layer is close to the estimate of Buffett (2014)[7]. The analyses of recent geomagnetic models and paleomagnetic data in terms of such waves could confirm the robustness of previous estimates of the properties of the layer.[ Reference ][1] Helffrich, G., Kaneshima, S. (2010) Nature, 468, 807. doi: 10.1038/nature09636[2] Buffett, B. A., Seagle, C. T. (2010) J. Geophys. Res., 115, B04407. doi: 10.1029/2009JB006751[3] Pozzo, M., Davies, C., Gubbins, D., Alfè, D. (2012) Nature, 485, 355. doi: 10.1038/nature11031[4] Gubbins, D., Davies, C. J. (2013) Phys. Earth Planet. Inter., 215, 21. doi: 10.1016/j.pepi.2012.11.001[5] Brodholt, J., Badro, J. (2017) Geophys. Res. Lett., 44, 8303. doi: 10.1002/2017GL074261[6] Braginsky, S. I. (1993) J. Geomag. Geoelectr., 45, 1517. doi: 10.5636/jgg.45.1517[7] Buffett, B. (2014) Nature, 507, 484. doi: 10.1038/nature13122[8] Case, K. M. (1960) Phys. Fluids, 3, 143. doi: 10.1063/1.1706010[9] Goedbloed, J. P., Poedts, S. (2004) Principles of magnetohydrodynamics: with applications to laboratory and astrophysical plasmas, Cambridge Univ. Press, Cambridge.[10] Nakashima, R. (2020) Ph.D. thesis, Kyushu University. http://dyna.geo.kyushu-u.ac.jp/HomePage/nakashima/pdf/doctoral_thesis.pdf
著者
中島 涼輔 吉田 茂生
雑誌
JpGU-AGU Joint Meeting 2020
巻号頁・発行日
2020-03-13

Magnetohydrodynamic (MHD) shallow water linear waves are examined on a rotating sphere with a background toroidal magnetic field expressed as B0Φ=B0sinθ, where B0 is constant, θ is the colatitude and Φ is the azimuth. The MHD shallow water equations are often used in studying the dynamics of the solar tachocline (e.g. Gilman & Dikpati, 2002[1]; Márquez-Artavia et al., 2017[2]) and sometimes the outermost Earth's core (Márquez-Artavia et al., 2017[2]; Nakashima, Ph.D. thesis, 2020[3]) and exoplanetary atmosphere (e.g. Heng & Workman, 2014[4]). In this poster, we especially focus on the propagation mechanisms and the force balances of polar trapped waves and unstable modes (Márquez-Artavia et al., 2017[2]; Nakashima, Ph.D. thesis, 2020[3]).Comprehensive searches for eigenmodes yield two polar trapped modes when the main magnetic field is weak (the Lehnert number α=VA/2ΩR2<0.5, where VA is the Alfvén wave velocity, Ω is the rotation rate and R is the sphere radius). One is the slow magnetic Rossby waves, which propagate eastward for zonal wave number m≧2 (Márquez-Artavia et al., 2017[2]). As the Lamb's parameter ε=4Ω2R2/gh→0 (where g is the gravity acceleration and h is the equivalent depth), these branches asymptotically approach the eigenvalues of two-dimensional slow magnetic Rossby waves. Another is newly discovered westward polar trapped modes (Nakashima, Ph.D. thesis, 2020[3]).In the case when α>0.5 (the background field is strong), these novel westward modes merge with the westward-propagating fast magnetic Rossby waves. In addition, only when m=1, polar trapped unstable modes appear due to the interaction between these fast magnetic Rossby waves and westward-propagating slow magnetic Rossby waves. These growth modes are believed to be the polar kink (Tayler) instability (Márquez-Artavia et al., 2017[2]).In order to easily understand the propagation mechanisms and the force balances of polar trapped modes, we investigate a cylindrical model around a pole with an artificial boundary condition. This model provides the approximate dispersion relations and eigenfunctions of polar trapped modes, and indicates that stable polar trapped modes are governed by magnetostrophic balance and that the metric magnetic tension force causes the difference between the slow magnetic Rossby waves and the novel westward modes. For m=1 and α>0.5, the balance between Coriolis and Lorentz forces is disrupted and the part of magnetic tension with which Coriolis force can not compete induces kink instability.[ Reference ][1] Gilman, P. A., Dikpati, M. (2002) Astrophys. J., 576, 1031. doi: 10.1086/341799[2] Márquez-Artavia, X., Jones, C. A., Tobias, S. M. (2017) Geophys. Astrophys. Fluid Dyn., 111, 282. doi: 10.1080/03091929.2017.1301937[3] Nakashima, R. (2020) Ph.D. thesis, Kyushu University. http://dyna.geo.kyushu-u.ac.jp/HomePage/nakashima/pdf/doctoral_thesis.pdf[4] Heng, K., Workman, J. (2014) Astrophys. J. Sup., 213, 27. doi: 10.1088/0067-0049/213/2/27
著者
吉田 俊一
出版者
日本水産増殖学会
雑誌
水産増殖 (ISSN:03714217)
巻号頁・発行日
vol.20, no.1, pp.27-35, 1972-04-30 (Released:2010-03-09)
参考文献数
11

以上の諸実験から飼育上の条件を要約すると1.飼育水はできるだけ高塩分のものを用いるのがよい。2.飼料はウナギ用のようににおいの強い, 粉末もしくは粒状の魚粉を主体としたものがよい。3.投餌は少量づつ, 回数多く与え, 投餌後しばらくは止水, そのほかは極少量の流水とする。4.全期間を通じて干出による支障はないが, 酸素補給面から通気は不可欠である。
著者
久保田 健市 吉田 富二雄
出版者
日本社会心理学会
雑誌
社会心理学研究 (ISSN:09161503)
巻号頁・発行日
vol.11, no.2, pp.116-124, 1995

Two studies using the minimal group paradigm were conducted to investigate the intergroup discrimination in an experimentally created minority and majority groups. In both studies, subjects were divided into the minority and the majority group by drawing lots, and asked to allocate points between other ingroup members and outgroup members. In the first study, it was found that the minority group showed significant ingroup favouritism whereas the majority group did not. The minority group was more aware of their membership in the group than their counterpart. In the second study, subjects were led to believe that the minority group and the majority group had either similar or different social attitude. On the whole, both the minority and the majority group favoured a similar group and discriminated against a dissimilar group. The effects of attitudinal similarity in minimal groups were discussed.
著者
吉田 康一 吉田 隆一 伊東 智美 殿内 利夫 斎藤 達哉 瀧谷 佳晃 河野 哲 吉田 隆一
出版者
特定非営利活動法人 日本歯科保存学会
雑誌
日本歯科保存学雑誌 (ISSN:03872343)
巻号頁・発行日
vol.58, no.6, pp.456-473, 2015 (Released:2016-01-06)
参考文献数
37

目的 : 強酸性水中の塩素酸や次亜塩素酸は大気に触れると反応し分解する. 水が凝固する際は食塩等溶解物を析出し純水に近い形で凍結するが, 電解機能水を氷結して固体で保存すれば対流はなく酸素との接触面は固定化され, 内部成分を保護でき, 殺菌力を維持した長期保存が可能になると考えた. 装置での機能水生成条件を変えて獲得した, さまざまな強酸性電解水と強アルカリ性電解水を氷結し, 保存条件を変えて解凍液の諸性質の変化を調べ, 最適な使用条件を求めた.  材料と方法 : 可変電圧 (0~90V), 直流電流 (0~10A, 整流), 貯留式の二室型機能水製造装置を試作した. 装置は生成される機能水の性状を大幅に変えることができる. 食塩水の電解により得られた酸性水とアルカリ性水を氷結前に10ml採取し, pHとORP値 (mV), 残留塩素濃度 (ppm) の測定を行った. 両水溶液は容器 (80ml) に各60mlを注入し, −17°Cの冷凍庫にて氷結した. 24, 168時間後に容器を取り出し, 室温 (23°C) で約2時間放置して解凍し, 性状を再度計測した. 分析は, 食塩添加率 (要因A) ; 3水準 (0.3, 0.6, 0.9wt%), 電解電流 (B) ; 2水準 (2, 4A), 保存方法 (C) ; 2水準 (容器の密閉の有無), 氷結時間 (D) ; 2水準として, ランダムに繰り返し3回行い, 測定値を項目別に四元配置分散分析した. さらに, 氷結保存の方法と期間が水溶液に与える影響のみを, 同データからWelchのt-testによって検定した. 機能水生成直後の諸性質の測定値に対して, 同一液で氷結解凍後に得られた値を直線方程式にて回帰分析した.  成績 : 分析から酸性電解水では, pHは解凍液でも2.2以内の酸性度を維持した. ORP値は容器の密閉を行う短期間保存で高い値を維持したが, いずれの条件でも解凍液は1,100mV以上だった. 塩素濃度 (ppm) は氷結保存の前後で263ppmから経時的に減少したが, 食塩添加率と電解電流値を高くし, 容器の密閉でこれを抑制できた. 密閉保存, 168時間氷結の解凍液でy=0.5251x−36.212 (r=0.919**) であった. 開栓でも多種の生成・保存条件の解凍液で, 薬事法上の殺菌料としての強・弱酸性次亜塩素酸水に近似した性状を獲得した. アルカリ性水では, pHは生成時の電解電流が高ければ解凍液でもわずかにアルカリ側に傾いた. ORP値は−849.2から解凍後に+224.94~301mVに転じたが, 容器の密閉によって上昇を抑制できた.  結論 : 生成・保存条件の調節により, 容器を開栓し168時間の氷結保存で解凍した酸性電解水でも十分な殺菌能が維持されており, 密閉保存すればこれが向上した. 解凍アルカリ性電解水では, 市販清掃用アルカリ性水に近似した性状であった. 氷結保存法により解凍後も殺菌能をもつ機能水を獲得でき, 人体への臨床応用の可能性が示唆された.
著者
吉田 孝夫 吉田 孝夫
出版者
奈良女子大学文学部 欧米言語文化学会
雑誌
欧米言語文化研究 (ISSN:21880727)
巻号頁・発行日
no.5, pp.164(15)-140(39), 2017-12-30

本論文はJSPS科研費17K02619「近世ドイツの文学・伝承・図像資料におけるHeilbad(湯治場)表象の研究」(基盤研究C、平成29-32年度 研究代表者:吉田孝夫)の助成を受けて執筆された。