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Microstructure,hardening and deuterium retention in CVD tungsten irradiated with neutrons at temperatures of defect recovery stagesⅡandⅢ

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Tungsten 2022年第3期4卷 248-260页

作者： Xiao-Ou Yi Tatsuya Kuwabara Vladimir KhAlimov Yu-Feng Du Wen-Tuo Han Ping-Ping Liu Bin-You Yan Jiu-Peng Song Kenta Yoshida Takeshi Toyama Fa-Rong Wan Somei Ohnuki Yuji Hatano Yasuyoshi Nagai School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China Graduate School of Engineering Nagoya UniversityFuro-choChikusa-kuNagoya464-8063Japan Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of SciencesMoscow119071Russia Institute for Materials Research Tohoku UniversityNarita-cho 2145-2OaraiIbaraki311-1313Japan Xiamen Tungsten Co.Ltd. Xiamen361021China School of Materials Science and Engineering Xihua UniversityChengdu610039China Hydrogen Isotope Research Center University of ToyamaToyama930-8555Japan

Samples of ultra-high-purity tungsten prepared using chemical vapour deposition(CVD)technique were irradiated with neutrons at temperatures T_(irr)=373-483 K(stage Ⅱ of defect recovery)and T_(irr)=573-673 K(stage Ⅲ)up to 0.15 displacements per atom(dpa)in the Belgian reactor(BR2).The study of the microstructure of neutron-damaged samples using transmission electron microscopy(TEM)revealed visible defects with a predominance of dislocation loops.With an increase in the neutron irradiation temperature,the spatial distribution of the loops acquired pronounced inhomogeneity,and their average size moderately increased.Cavities and voids were not observed.Irradiation-induced hardening was found and a linear correlation was obtained between Vickers microhardness and nanohardness for undamaged and neutron-irradiated CVD-W samples.Irradiation of tungsten with neutrons led to a significant increase in the retention of deuterium,which accumulated mainly in vacancy-type traps.Furthermore,the influence of the columnar grain structure in low-dose neutron-irradiated tungsten seemed to be non-trivial upon deuterium retention.

关键词： CVD-W Neutron irradiation Microstructure Hardening Deuterium retention

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Nitrous oxide fluxes from upland soils in central Hokkaido,Japan

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Journal of Environmental Sciences 2008年第11期20卷 1312-1322页

作者： Sonoko D.KIMURA Yo TOMA Ryusuke hatano Graduate School of Agriculture Tokyo University of Agriculture and TechnologyTokyo 183-8509Japan Graduate School of Agriculture Hokkaido UniversitySapporo 060-8589Japan

Nitrous oxide (N2O) fluxes from soils were measured using the closed chamber method during the snow-free seasons (middle April to early November),for three years,in a total of 11 upland crop fields in central Hokkaido,Japan.The annual mean N2O fluxes ranged from 2.95 to 164.17 μgN/(m2·h),with the lowest observed in a grassland and the highest in an onion field.The instantaneous N2O fluxes showed a large temporal variation with peak emissions generally occurring following fertilization and heavy rainfall eve...

关键词： mineral N pool N2O flux soil upland cropping system

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Study on Performance and Flow Field of an Undershot Cross-Flow Water Turbine Comprising Different Number of Blades

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Journal of Thermal Science 2017年第5期26卷 413-430页

作者： Yasuyuki Nishi Kentaro hatano Terumi Inagaki Department of Mechanical Engineering Ibaraki University 4-12-1 Nakanarusawa-cho Hitachi-shi Ibaraki 316-8511JAPAN Graduate School of Science and Engineering Ibaraki University 4-12-1 Nakanarusawa-cho Hitachi-shi Ibaraki316-8511 JAPAN

Recently, small hydroelectric generators have gained attention as a further development in water turbine technology for ultra low head drops in open channels. The authors have evaluated the application of cross-flow water turbines in open channels as an undershot type after removing the casings and guide vanes to substantially simplify these water turbines. However, because undershot cross-flow water turbines are designed on the basis of cross-flow water turbine runners used in typical pipelines, it remains unclear whether the number of blades has an effect on the performance or flow fields. Thus, in this research, experiments and numerical analyses are employed to study the performance and flow fields of undershot cross-flow water turbines with varying number of blades. The findings show that the turbine output and torque are lower, the fluctuation is significantly higher, and the turbine efficiency is higher for runners with 8 blades as opposed to those with 24 blades.

关键词：水轮机技术导流叶片性能流场小型水轮发电机水轮机转轮同数贯流式水轮机

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Diffusivity Models and Greenhouse Gases Fluxes from a Forest,Pasture,Grassland and Corn Field in Northern Hokkaido,Japan

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Pedosphere 2010年第6期20卷 747-760页

作者： N.V.NKONGOLO R.hatano V.KAKEMBO Harvard Forest Faculty of Arts and SciencesHarvard University Laboratory of Science Division of Environmental ResourcesGraduate School of Agriculture Hokkaido University Department of Geosciences School of Environmental SciencesFaculty of ScienceNelson Mandela Metropolitan University

Information on the most influential factors determining gas flux from soils is needed in predictive models for greenhouse gases emissions.We conducted an intensive soil and air sampling along a 2 000 m transect extending from a forest,pasture,grassland and corn field in Shizunai,Hokkaido (Japan),measured CO 2 ,CH 4 ,N 2 O and NO fluxes and calculated soil bulk density (ρ b ),air-filled porosity (f a ) and total porosity (Φ).Using diffusivity models based on either f a alone or on a combination of f a and Φ,we predicted two pore space indices: the relative gas diffusion coefficient (D s /D o ) and the pore tortuosity factor (τ).The relationships between pore space indices (D s /D o and τ) and CO 2 ,CH 4 ,N 2 O and NO fluxes were also studied.Results showed that the grassland had the highest ρ b while f a and Φ were the highest in the forest.CO 2 ,CH 4 ,N 2 O and NO fluxes were the highest in the grassland while N 2 O dominated in the corn field.Few correlations existed between f a ,Φ,ρ b and gases fluxes while all models predicted that D s /D o and τ significantly correlated with CO 2 and CH 4 with correlation coefficient (r) ranging from 0.20 to 0.80.Overall,diffusivity models based on f a alone gave higher D s /D o ,lower τ,and higher R 2 and better explained the relationship between pore space indices (D s /D o and τ) and gases fluxes.Inclusion of D s /D o and τ in predictive models will improve our understanding of the dynamics of greenhouse gas fluxes from soils.D s /D o and τ can be easily obtained by measurements of soil air and water and existing diffusivity models.

关键词：温室气体排放量扩散系数预测模型北海道玉米田通量森林草地

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日本京都府立医科大学疼痛与姑息医学科应用内脏神经阻滞术治疗上腹部癌痛的现状

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实用疼痛学杂志 2018年第1期14卷 9-13页

作者： Kiyohiko hatano Toyoshi Hosokawa Keita Fukazawa 姚军日本国京都府立医科大学疼痛与姑息治疗学科河北大学附属医院疼痛科保定市071000

目的本文报告在锥束CT下接受内脏神经阻滞术(SNB)治疗的上腹部恶性肿瘤疼痛患者24例的疼痛缓解效果,并讨论CT成像在两例患者中的应用.方法癌症相关的上腹部疼痛患者24例,从2015年6月起6个月内接受SNB治疗.分别对他们在治疗前和治疗后... 详细信息

目的本文报告在锥束CT下接受内脏神经阻滞术(SNB)治疗的上腹部恶性肿瘤疼痛患者24例的疼痛缓解效果,并讨论CT成像在两例患者中的应用.方法癌症相关的上腹部疼痛患者24例,从2015年6月起6个月内接受SNB治疗.分别对他们在治疗前和治疗后1周的疼痛数字评分量表(NRS)变化、阿片类药物使用剂量变化(等效剂量吗啡转换)及治疗引起的并发症发生率进行回顾性研究.SNB经T12～L1或L1-2椎间盘入路进行,应用阻力消失法将造影剂注入膈脚后间隙,并使用锥束CT以及透视法确认造影剂的扩散.神经阻滞剂使用99.5％脱水乙醇10～20 ml.结果受试者24例,男15例,女9例,平均年龄63.8岁.NRS从治疗前的5/10下降至治疗后1周的0.86/10(P＜0.01),阿片类药物使用剂量(等效剂量吗啡转换)从治疗前86.6 mg/d降至治疗后1周的58 mg/d(P＜0.01).仅观察到以下轻度不良反应:一过性低血压(8例)、恶心(5例)和腹泻(3例),未观察到严重不良反应.结论 SNB是治疗癌症诱发的腹部疼痛的有效方法,联合应用锥束CT可提高疼痛缓解效果.

关键词：内脏神经阻滞(SNB) 锥束CT (cone-beam CT)

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Advanced diffusion magnetic resonance imaging in patients with Alzheimer’s and Parkinson’s diseases

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Neural Regeneration Research 2020年第9期15卷 1590-1600页

作者： Koji Kamagata Christina Andica Taku hatano Takashi Ogawa Haruka Takeshige-Amano Kotaro Ogaki Toshiaki Akashi Akifumi Hagiwara Shohei Fujita Shigeki Aoki Department of Radiology Juntendo University Graduate School of MedicineTokyoJapan Department of Neurology Juntendo University School of MedicineTokyoJapan

The prevalence of neurodegenerative diseases is increasing as human longevity increases. The objective biomarkers that enable the staging and early diagnosis of neurodegenerative diseases are eagerly anticipated. It has recently become possible to determine pathological changes in the brain without autopsy with the advancement of diffusion magnetic resonance imaging techniques. Diffusion magnetic resonance imaging is a robust tool used to evaluate brain microstructural complexity and integrity, axonal order, density, and myelination via the micron-scale displacement of water molecules diffusing in tissues. Diffusion tensor imaging, a type of diffusion magnetic resonance imaging technique is widely utilized in clinical and research settings;however, it has several limitations. To overcome these limitations, cutting-edge diffusion magnetic resonance imaging techniques, such as diffusional kurtosis imaging, neurite orientation dispersion and density imaging, and free water imaging, have been recently proposed and applied to evaluate the pathology of neurodegenerative diseases. This review focused on the main applications, findings, and future directions of advanced diffusion magnetic resonance imaging techniques in patients with Alzheimer's and Parkinson's diseases, the first and second most common neurodegenerative diseases, respectively.

关键词： Alzheimer's disease biomarkers diffusional kurtosis imaging disease progression early diagnosis free-water imaging neurites neurite orientation dispersion and density imaging Parkinson's disease

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Structures of Tannins and Related Polyphenols in Medicinal Plants and Their Biological and Pharmacological Effects

Structures of Tannins and Related Polyphenols in Medicinal P...

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第八届全国药用植物及植物药学术研讨会

作者： Tsutomu hatano Okayama University Graduate School of Medicine Dentistry and Pharmaceutical SciencesTsushimaOkayama 700-8530 Japan

Structural studies on the condensed tannins(proanthocyanidins) have been mainly conducted by D.G Roux, D.Ferreira,and their co-workers in South Africa,and also by E.Haslam‘s group in England.On the other hand, studies by O.Th.Schmidt,W.Mayer,and their co-workers revealed structures of some types of hydrolyzable tannins and their constituting acyl groups.In spite of their extensive works,tannins in many medicinal plants

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Nitrogen Flow in the Rural Ecosystem of Mikasa City in Hokkaido, Japan

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Pedosphere 2006年第2期16卷 264-272页

作者： L. LIANG T. NAGUMO R. hatano Graduate School of Agriculture Hokkaido University Sapporo 060-8589 （Japan）. Center for Education and Research of Field Sciences Shizuoka University Fujieda 426-0001 （Japan） Field Science Center for Northern Biosphere Hokkaido University Sapporo 060-8589 （Japan）

This study of Mikasa City in 2001, which analyzed N flow between N production and N load in seven agricultural and settlement subsystems, i.e., paddy, onion, wheat, vegetable, dairy, chicken, and citizen subsystems, aimed to compare N flow in each subsystem, to determine the main sources of the N load, and to evaluate the influence of agricultural production and food consumption on N cycling in a rural area. The results showed that in Mikasa city, 38.5% of the N load came from point sources and the remainder from non-point sources with intensive vegetable farming imparting a serious N load. Because of the internal N cycling in the dairy subsystem, chemical fertilizer application was reduced by 70.2%, and 23.72 Mg manure N was recycled to the field; therefore, the N utilization efficiency was raised from 18.1% to 35.1%. If all the manure N in the chicken subsystem was recycled, chemical fertilizer application would be reduced by 8.1% from the present level, and the point sources of N pollution would be reduced by 20.8%.

关键词：化学肥料生态系统生态环境氮承载量

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Millimeter-Wave Concurrent Beamforming:A Multi-Player Multi-Armed Bandit Approach

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Computers, Materials & Continua 2020年第12期65卷 1987-2007页

作者： Ehab Mahmoud Mohamed Sherief Hashima Kohei hatano Hani Kasban Mohamed Rihan Electrical Engineering Department College of EngineeringPrince Sattam Bin Abdulaziz UniversityWadi Addwasir11991Saudi Arabia Electrical Engineering Department Faculty of EngineeringAswan UniversityAswan81542Egypt Computational Learning Theory Team RIKEN-Advanced Intelligent ProjectFukuoka819-0395Japan Engineering Department Nuclear Research CenterEgyptian Atomic Energy AuthorityCairo13759Egypt Faculty of Arts and Science Kyushu UniversityFukuok819-0395Japan Electronics and Electrical Communication Engineering Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt

The communication in the Millimeter-wave(mmWave)band,i.e.,30~300 GHz,is characterized by short-range transmissions and the use of antenna beamforming(BF).Thus,multiple mmWave access points(APs)should be installed to fully cover a target environment with gigabits per second(Gbps)connectivity.However,inter-beam interference prevents maximizing the sum rates of the established concurrent links.In this paper,a reinforcement learning(RL)approach is proposed for enabling mmWave concurrent transmissions by finding out beam directions that maximize the long-term average sum rates of the concurrent links.Specifically,the problem is formulated as a multiplayer multiarmed bandit(MAB),where mmWave APs act as the players aiming to maximize their achievable rewards,i.e.,data rates,and the arms to play are the available beam directions.In this setup,a selfish concurrent multiplayer MAB strategy is advocated.Four different MAB algorithms,namely,ϵ-greedy,upper confidence bound(UCB),Thompson sampling(TS),and exponential weight algorithm for exploration and exploitation(EXP3)are examined by employing them in each AP to selfishly enhance its beam selection based only on its previous observations.After a few rounds of interactions,mmWave APs learn how to select concurrent beams that enhance the overall system performance.The proposed MAB based mmWave concurrent BF shows comparable performance to the optimal solution.

关键词： Millimeter wave(mmWave) concurrent transmissions reinforcement learning multiarmed bandit(MAB)

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High-density circulating fluidized bed gasifier for advanced IGCC/IGFC-Advantages and challenges

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Particuology 2010年第6期8卷 602-606页

作者： Guoqing Guan Chihiro Fushimi Atsushi Tsutsumi Masanori Ishizuka Satoru Matsuda Hiroyuki hatano Yoshizo Suzuki Collaborative Research Center for Energy Engineering Deportment of Mechanical and Biolhnctional Systems Institute of Industrial Science The University of Tokyo 4-6-1 Komaba Meguoro-ku Tokyo 153-8505Japan Clean Gas Group National Institute of Advanced Industrial Science and Technology 16- 1 Onogawa Tsukuba Iboraki 305-8569Japan

Coal-fired Integrated Gasification Combined Cycle （IGCC） and Integrated coal Gasification Fuel-cell Com- bined cycle （IGFC） are being developed as high-efficiency electric power generation technology. However, the highest theoretical gross thermal efficiency of the conventional IGCC]IGFC is still below 52~. In order to obtain higher power generation efficiency, an advanced IGCC （A-IGCC） or advanced IGFC （A-IGFC） sys- tem making use of the exergy recuperation concept by recycling waste heat from gas turbine or fuel cells for steam gasification of coal and biomass was proposed in our laboratory, Corresponding to this system, a novel high-density triple-bed combined circulating fluidized bed （TBCFB） gasifier, composed of a downer pyrolyzer, a bubbling fluidized bed char gasifier, and a riser combustor, was proposed to replace traditional gasifiers such as the entrained flow bed gasifier. The new system is expected to more effectively utilize the waste heat from gas turbines or fuel cells and the heat produced by the combustion of the unreacted char in the riser combustor for pyrolysis and gasification of coal and biomass. In this short review, the advantages and future challenges in the development of high-density TBCFB gasifier are presented and discussed.

关键词： IGCC/IGFC High-density circulating fluidized bed Gasifier Riser Downer Bubbling fluidized bed Exergy recuperation Biomass Coal

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