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Observation of Edge Plasma Fluctuations with a Fast Camera in heliotron J

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Plasma Science and Technology 2013年第3期15卷 213-216页

作者：臧临阁 M.TAKEUChI N.NIShINO T.MIZUUChI S.OhShIMA K.KASAJIMA M.ShA K.MUKAI h.Y.LEE K.NAGASAKI h.okada T.MINAMI S.KOBAYAShI S.YAMAMOTO K.hANATANI Y.NAKAMURA S.KONOShIMA F.SANO Graduate School of Energy Science Kyoto University Naka Fusion Institute Japanese Atomic Energy Agency Graduate School of Engineering Hiroshima University Institute of Advanced Energy Kyoto University

A fast video camera is verified to be a powerful t0ol for observation of filaments/blobs near the last closed flux surface （LCFS）. In order to extract the fluctuation component from the raw data of the fast camera, a pre-processing technique, sliding time window averaging subtraction （STWAS） has been developed to remove the background of slowly varying emission from the bulk plasma. By using this pre-processing technique, the fast camera data are analyzed. A method to identify the filaments in the pre-processed image is also discussed.

关键词： edge plasma fluctuation fast camera heliotron J

Plasma Confinement Characteristics in heliotron J——Spontaneous Change of Plasma Confinement State

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Plasma Science and Technology 2004年第4期6卷 2371-2376页

作者： T.Mizuuchi h.okada K.Nagasaki S.Kobayashi S.Yamamoto F.Sano K.Kondo K.hanatani M.Nakasuga Y.Nakamura Y.Suzuki Y.Manabe h.Shidara h.Kawazome M.Kaneko Y.Nishioka Y.Ohno T.Takamiya h.Yukimoto Y.Fukagawa Y.Morita S.Nakazawa S.Nishio K.Takahashi S.Tuboi M.Yamada K.Ohashi Y.Ijiri T.Senju K.Yaguchi K.Sakamoto K.Tohshi M.Shibano T.Obiki Institute of Advanced Energy Kyoto UniversityUji 611-0011Japan Graduate School of Energy Science Kyoto UniversityUji 611-0011Japan

Spontaneous transition of the plasma confinement mode was observed in thehelical-axis heliotron device 'heliotron J' for three different plasma heating schemes, ***-only, NBI-only and the combination of ECh and NBI. The transition seems to occur above a certaincritical density. In addition to the confinement transition, a spontaneous shift of the hittingposition of the divertor plasma flux on the wall was observed. This shift could be related with thechange of the edge field topology caused by non-inductive toroidal currents.

关键词： heliotron J plasma confinement transition phenomena

Mechanism of reduction-diffusion reaction in Sm-Fe binary system at low temperature using molten salts

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Journal of Rare Earths 2024年第10期42卷 1889-1894页

作者： Jungryang Kim Shusuke okada Kenta Takagi Kimihiro Ozaki Innovative Functional Materials Research Institute National Institute of Advanced Industrial Science and Technology (AIST)

In this study,the mechanism of the reduction-diffusion reaction in a Sm-Fe binary system at low temperature was studied to investigate the possibility of synthesis of a Fe-rich TbCu7-type SmFex（x>9）by the low-temperature diffusion-reduction（LTRD） process using LiCl-KCl eutectic molten ***,the Sm-Fe phase transformation depending on the Sm-Fe composition,the LTRD temperature,and time was investigated,and it is found that the obtained metastable phase is only TbCu7-type SmFe～8.5,which is not a Fe-rich *** Fe content does not change even after an expended LTRD process,and the metastable TbCu7-type SmFe～8.5tends to transform to the stable *** addition,it is found that the Sm-Fe phase starts to synthesize from the Sm-rich phase in the order of SmFe2,SmFe3,and SmFe8.5as the LTRD temperature increases（when the time was 10 h） or the LTRD time increases（when the temperature was 550℃）.Core-shell-like particles are observed in the case of a short LTRD time,and the core and the shell are Fe and the Sm-rich Sm-Fe phase,respectively,indicating that the Sm-rich phase begins to produce on the surface of the Fe *** is difficult to synthesize a Fe-rich TbCu7-type SmFex（x>9） phase with the Sm-Fe binary system,suggesting that a different approach,such as addition of other elements,will be necessary.

关键词： Low-temperature synthesis Molten salts Rare earths Reduction-diffusion process Sm–Fe compounds Synthesis mechanism

Estimating the effective reproduction number of COVID-19 from population-wide wastewater data:An application in Kagawa,Japan

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Infectious Disease Modelling 2024年第3期9卷 645-656页

作者： Yuta okada hiroshi Nishiura Kyoto University School of Public health Yoshida-KonoeSakyoKyoto606-8601Japan

Although epidemiological surveillance of COVID-19 has been gradually downgraded globally,the transmission of COVID-19 *** is critical to quantify the transmission dynamics of COVID-19 using multiple datasets including wastewater virus concentration ***,we propose a comprehensive method for estimating the effective reproduction number using wastewater *** wastewater virus concentration data,which were collected twice a week,were analyzed using daily COVID-19 incidence data obtained from Takamatsu,Japan between January 2022 and September *** estimated the shedding load distribution(SLD)as a function of time since the date of infection,using a model employing the delay distribution,which is assumed to follow a gamma distribution,multiplied by a scaling *** also examined models that accounted for the temporal smoothness of viral load measurement *** model that smoothed temporal patterns of viral load was the best fit model(WAIC=2795.8),which yielded a mean estimated distribution of SLD of 3.46 days(95%CrI:3.01–3.95 days).Using this SLD,we reconstructed the daily incidence,which enabled computation of the effective reproduction *** the best fit posterior draws of parameters directly,or as a prior distribution for subsequent analyses,we first used a model that assumed temporal smoothness of viral load concentrations in wastewater,as well as infection counts by date of *** the subsequent approach,we examined models that also incorporated weekly reported case counts as a proxy for weekly incidence *** approaches enabled estimations of the epidemic curve as well as the effective reproduction number from twice-weekly wastewater viral load *** weekly case count data reduced the uncertainty of the effective reproduction *** conclude that wastewater data are still a valuable source of information for inferring the transmission dynamics of COVID-19,and that inferential performance is enhanced when tho

关键词： Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2) Wastewater-based epidemiology Shedding load distribution'Mathematical model

Epidemiological impact of revoking mask-wearing recommendation on COVID-19 transmission in Tokyo,Japan

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Infectious Disease Modelling 2024年第4期9卷 1289-1300页

作者： Mayu Nagata Yuta okada hiroshi Nishiura Kyoto University School of Public health Yoshida-KonoeSakyoKyoto606-8601Japan

Despite the global implementation of COVID-19 mitigation measures,the disease continues to maintain *** mask wearing became one of the key measures for preventing the transmission of COVID-19 early in the pandemic period,many countries have relaxed the mandatory or recommended wearing of *** objective of the present study was to estimate the epidemiological impact of removing the mask-wearing recommendation in *** developed a model to assess the consequences of declining mask-wearing coverage after the government revoked its recommendation in February *** declining mask-wearing coverage was estimated using serial cross-sectional data,and a mathematical model was devised to determine the age-specific incidence of COVID-19 using the observed case count in Tokyo from week of October 3,2022 to October 30,*** explored model-based counterfactual scenarios to measure hypothetical situations in which the mask-wearing coverage decreases or increases relative to the observed *** results show that mask-wearing coverage declined from 97%to 69%by the week of October 30,2023,and that if the mask-wearing recommendation had continued,427 lives could have been saved in *** the mask-wearing coverage had declined to 25%of the observed level,the model suggests there might have been 1587 additional ***,revoking the mask-wearing recommendation had a substantial epidemiological *** future pandemics,our proposed approach could provide a realtime quantification of the effects of relaxing countermeasures.

关键词： COVID-19 Mask wearing recommendation health policy Counterfactual Mathematical model

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射精后前列腺周围带和精囊T2值的显著改变

国际医学放射学杂志 2018年第3期 362-362页

作者： T.Shin Y.Kaji T.Shukuya M.Nozaki S.Soh h.okada 刘磊 Department of Radiology Dokkyo Medical University

摘要目的应用MRI分析射精后前列腺和精囊(SV)的定量改变。方法招募10名健康的年轻男性受试者,并在2次连续的射精前后进行T2WI和Tmapping MRI检查。分别

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耕作和施肥对日本大豆田线虫种群结构的影响

大豆科技 2011年第1期 37-37页

作者： h.okada h．harada 潘凤娟（摘译）

免耕体系（NT）下土壤生物区系多样，真菌的降解速度慢。然而有时候通过分析线虫种群结构不能发现免耕土壤的这一特征，主要是由于以往研究的试验处理或是取样时期太短或是没有代表性。土壤线虫的分布因地理位置和土壤类型而异，这对利... 详细信息

免耕体系（NT）下土壤生物区系多样，真菌的降解速度慢。然而有时候通过分析线虫种群结构不能发现免耕土壤的这一特征，主要是由于以往研究的试验处理或是取样时期太短或是没有代表性。土壤线虫的分布因地理位置和土壤类型而异，这对利用线虫种群结构分析评价土壤生物多样性产生一定的影响。

关键词：密度多样性肥料线虫结构指数土壤性质耕作

In Search of the Cretaceous-Tertiary Boundary in heilongjiang River Area of China

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Global Geology 2002年第2期7卷 105-113页

作者： Sun G. M.Akhmetiev Dong Z.M. A.R.Ashraf Sun Y.W. E.Bugdaeva D.L.Dilcher L.Golovneva I.harding K.Johnson T.Kezina T.Kodrul LU J.S. V.Markevich h.Nishida h.okada Park S.O. Sun C.L. Xiong X.Z. Xing Y.L. Zhou Z.L. Research Center of Paleontology&Stratigraphy Jilin UniversityChangchun130026China Geological Institute of Russian Academy of Sciences(RAS) Moscow109017Russia Institute of Geology&Paleontology Tuebingen UniversityTuebingenD-72076Germany Institute of Biology&Pedology FEBRASVladivostok690022Russia Florida Museum of Natural history University of FloridaGainesville FL32611-7800USA Botanical Institute of RAS St.-Petersburg197376Russia School of Ocean&Geosciences University of SouthamptonSouthamptonSO143ZH UK Denver Museum of Nature&Sciences Denver CO80205USA Amur Research Integrated Institute FEBRASBlagoveschesk675000Russia Chuo University Tokyo112-8551Japan Oyo Corporation Fukuoka811-1302Japan Dept.Of Geology Kyungpook National UniversityDaegu702-201Korea Geological Museum of heilongjiang Harbin150036China

A new geological section recognized in Baishantou of Jiayin,heilongjiang Province,China,was studied preliminarily in searching for the K/T *** early Paleocene florule characrerized by abundant Tiliaephyllum tsagajanicum leaves and its associated plants,was collected from the Baishantou Member(new member representing the lower part of the Paleocene Wuyun Formation)overlying the possible K/T boundary.A tuff bed was found from the upper part of the Furao Formation(uppermost Cretaceous)in this *** new findings imply that the K/T boundary is probable lying in the interval between the base of the Baishantou Member and the tuff bed,based on the correlation of the present strata with the stratotype of the Tsagajan Group spanning the K/T boundary in"Belaya Gara"of the Bureya Basin,*** early Paleocene florule from the Baishantou Member and the early-middle Maastrichtian dinosaurs found from the Yuliangzi Formation underlying the Furao Formation suggest that the Baishantou section is more promising for searching for the K/T boundary in this *** studies of the section is needed,integrating paleontological,biostratigraphic,geochemical,paleomagnetic,and sedimentary research would benefit our understanding the mass extinction event and biotic recovery in the heilongjiang River area,China,and even all of northeast Asia during the K/T boundary interval.

关键词： K/T boundary Early Paleocene Baishantou Member Jiayin heilongjiang River

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黑龙江嘉荫地区白垩纪—第三纪界线初步观察

世界地质 2003年第1期22卷 8-14页

作者：孙革孙春林董枝明孙跃武吕建生熊宪政周忠立余福林邢玉玲全成 M.A.Akhmetiev A.R.Ashraf E.Bugdaeva D.L.Dilcher L.Golovneva K.Johnson T.Kezina T.Kodrul h.okada 吉林大学古生物学与地层学研究中心长春130026 黑龙江省地质博物馆哈尔滨150036 俄罗斯科学院地质所莫斯科109017 德国图宾根大学地质古生物学院图宾根d72076 俄罗斯科学院远东生物土壤研究所符拉迪沃斯托克690022 美国佛罗里达大学自然史博物馆根思维尔326117800 俄罗斯科学院植物所圣彼得堡197376 美国丹佛自然科学博物馆丹佛co80205 俄罗斯科学院阿穆尔综合研究所布拉戈维申斯克675000 日本Oyo公司九州分部

本文报道了黑龙江嘉荫白山头地区一条新的地层剖面及其K/T界线的初步研究。新命名的“白山头段”代表乌云组下部的早古新世地层 ,含以Tiliaephyllumtsagajanicum等为代表的达宁早期植物化石。在白山头剖面上 ,作者发现可能为白垩纪末期... 详细信息

本文报道了黑龙江嘉荫白山头地区一条新的地层剖面及其K/T界线的初步研究。新命名的“白山头段”代表乌云组下部的早古新世地层 ,含以Tiliaephyllumtsagajanicum等为代表的达宁早期植物化石。在白山头剖面上 ,作者发现可能为白垩纪末期的凝灰岩。结合与俄罗斯布列亚盆地含K/T界线的查加扬群标准剖面的对比。

关键词： K/T界线早古新世白山头段黑龙江嘉荫