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reference Design of ICrF Antenna for EAST

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Plasma Science and Technology 2006年第3期8卷 358-362页

作者：秦成明赵燕平 Hiroyuki OKADA 张新军毛玉周 T.WATArI r.kumazawa T.SEKI Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China National Institute for Fusion Science Furo-cho Chikusa-ku Nagoya 464-01 Japan Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China

An antenna array suitable for plasma heating and current drive has been designed for the ion cyclotron resonance frequency range （ICrF） heating on the EAST superconducting tokamak. The ICrF heating is planned to operate in a frequency range of 30 MHz to 80 MHz and hence the antenna geometry is optimized for 55 MHz. The design is based on the conventional strap antenna element. The coupling properties of the antenna are calculated with a slab model of the plasma for the antenna simulation. The coupling code is extended for the analysis of the toroidal antenna array separated by septa.

关键词： ICrF antenna design input impedance plasma coupling

Design of High Power DC Break For ICrH Of EAST

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Plasma Science and Technology 2005年第2期7卷 2727-2730页

作者：李国超赵燕平毛玉周丁家义薛迪冶秦成明 T.Watari r.kumazawa Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031China National Institute for Fusion Science Furo-cho Nagoya 464-01 Japan

1.5MW Ion Cyclotron Wave Heating system was developed, the transmitter and the antenna both have their ground loops, which will severely perturb the system’s normal operation. To avoid perturbation, a DC break was designed. The S parameter and the VSWr (voltage standing wave ratio) of incident port were calculated; the thermal effect caused by conductor loss and dielectric loss was analyzed.

关键词： DC break ion cyclotron wave heating (ICrH) coaxial line loss

High Power rF Transmitters for ICrF Applications on EAST

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Plasma Science and Technology 2013年第3期15卷 261-265页

作者：毛玉周袁帅赵燕平张新军陈根 r.kumazawa 程艳王磊琚松青邓旭秦成明杨磊 Institute of Plasma Physics Chinese Academy of Sciences National Institute for Fusion Science

An Ion Cyclotron range of Frequency （ICrF） system with a radio frequency （rF） power of 4×1.5 MW was developed for the Experimental Advanced Superconducting Tokamak （EAST）. High rF power transmitters were designed as a part of the research and development （r^D） for an ICrF system with long pulse operation at megawatt levels in a frequency range of 25 MHz to 70 MHz. Studies presented in this paper cover the following parts of the high power transmitter： the three staged high power amplifier, which is composed of a 5 kW wide- band solid state amplifier, a 100 kW tetrode drive stage amplifier and a 1.5 MW tetrode final stage amplifier, and the DC high voltage power supply （HVPS）. Based on engineering design and static examinations, the rF transmitters were tested using a matched dummy load where an rF output power of 1.5 MW was achieved. The transmitters provide 6 MW rF power in primary phase and will reach a level up to 12 MW after a later upgrade. The transmitters performed successfully in stable operations in EAST and HT-7 devices. Up to 1.8 MW of rF power was injected into plasmas in EAST ICrF heating experiments during the 2010 autumn campaign and plasma performance was greatly improved.

关键词： power amplifier rF transmitter ICrF system EAST

Design and realization of Liquid Stub Tuner Control System

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Plasma Science and Technology 2004年第6期6卷 2531-2534页

作者：潘亚平王磊赵燕平秦成明薛迪冶邓旭毛玉周丁家义 T.Watari r.kumazawa T.Seki Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China National Institute for Fusion Science Furo-cho Chikusa-ku Nagoya 464-01 Japan

In microwave circuit and aerial system, impedance matching is very important. Liquid stub tuner is a new type of impedance matching device. In the HT-7 Tokamak Ion Cyclotron resonance Heating ( ICrH ) system, we have already adopted liquid stub tuner to replace the conventional stub tuner. It is urgent to develop a control system of the liquid stub tuner. This paper mainly introduces the design and realization of the liquid stub tuner control system , and briefly introduces its three controlling functions: local control, remote control and computer control.

关键词： ICrH liquid stub tuner impedance matching control system

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EAST离子回旋系统液态相移器的理论设计

原子能科学技术 2005年第1期39卷 88-92页

作者：王鹏赵燕平毛玉周秦成明潘亚平 T.Watavi r.kumazawa T.Mutoh T.Seki 中国科学院等离子体物理研究所安徽合肥230031 National Institute for Fusion Science

对EAST离子回旋系统液态相移器的原理进行了理论分析和计算,结果表明:利用液态相移器可产生相位差,从而可用离子回旋波进行电流驱动。另外,液态相移器也可与单支节液态调配器结合使用,构成传输线阻抗匹配系统。

关键词：离子回旋电流驱动液态相移器支节调配器阻抗匹配核聚变超导托卡马克装置

Blind Spot Obstacle Detection from Monocular Camera Images with Depth Cues Extracted by CNN

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Automotive Innovation 2018年第4期1卷 362-373页

作者： Yuxiang Guo Itsuo kumazawa Chuyo Kaku Department of Information and Communication Engineering Tokyo Institute of TechnologyTokyo 152-8550Japan research and Development Center LBN Corporation Ltd.Shanghai 200233China

The images from a monocular camera can be processed to detect depth information regarding obstacles in the blind spot area captured by the side-view camera of a *** depth information is given as a classification result“near”or“far”when two blocks in the image are compared with respect to their distances and the depth information can be used for the purpose of blind spot area *** this paper,the proposed depth information is inferred from a combination of blur cues and texture *** depth information is estimated by comparing the features of two image blocks selected within a single image.A preliminary experiment demonstrates that a convolutional neural network(CNN)model trained by deep learning with a set of relatively ideal images achieves good *** same CNN model is applied to distinguish near and far obstacles according to a specified threshold in the vehicle blind spot area,and the promising results are *** proposed method uses a standard blind spot camera and can improve safety without other additional sensing ***,the proposed approach has the potential to be applied in vehicular applications for the detection of objects in the driver’s blind spot.

关键词： Coarse-to-fine analysis Convolutional neural network Blind spot detection Principal component analysis Discrete cosine transformation

Effect of casting speed on microstructure,corrosion behaviour and in vivo bone reaction of Mg-rare earth alloys

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Science China(Technological Sciences) 2021年第2期64卷 213-222页

作者： WANG HaiJian WANG HaiWei kumazawa Takashi JU DongYing CAO JianTing Department of Electronic Engineering Graduate School of EngineeringSaitama Institute of TechnologyFukaya 369-0293Japan Institute of Metal research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China Ningbo Haizhi Institute of Materials Industry Innovation Ningbo 315000China

In this study,two casting speeds of 10 and 30 r/min were used in vertical twin-roll casting(TrC)to obtain Mg-rare earth(Mg-rE)alloys,and their microstructures,corrosion behaviours and in vivo bone reactions were investigated in *** results indicated that the roll-castings of TrC-30 r/min exhibited a finer grain size and higher volume fraction of non-crystallization than those in castings of TrC-10 r/***,the results of electrochemical impedance spectroscopy(EIS)and potentiodynamic polarization indicated that the castings of TrC-30 r/min displayed a higher corrosion resistance compared with those in the castings of TrC-10 r/*** tests showed that a higher degree of newly formed bone tissues was achieved by implants of TrC-30 r/***,in vivo tests displayed that degradation properties of the TrC-30-r/min implants were better than those of the TrC-10-r/min implants;furthermore,the degradation layer was a two-layer structure,and P and Ca were enriched in the outer degradation *** summary,these findings elucidated that casting speed has a substantial effect on the microstructure and degradation property of Mg-based implants,and the degradation property performs better with increased casting speed.

关键词： Mg-rE alloys microstructure corrosion resistance in vivo

Scale variant vehicle object recognition by CNN module of multipooling- PCA process

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Journal of Intelligent and Connected Vehicles

Journal of Intelligent and Connected Vehicles 2023年第4期6卷 227-236页

作者： Yuxiang Guo Itsuo kumazawa Chuyo Kaku Department of Information and Communications Engineering Tokyo Institute of TechnologyTokyo 152-8550Japan research and Development Center Jiangsu Chaoli Electric Manufacture Co.Ltd.Shanghai 212321China

The moving vehicles present different scales in the image due to the perspective effect of different viewpoint *** premise of advanced driver assistance system(ADAS)system for safety surveillance and safe driving is early identification of vehicle targets in front of the ego *** recognition of the same vehicle at different scales requires feature learning with scale *** existing feature vector methods,the normalized PCA eigenvalues calculated from feature maps are used to extract scale-invariant *** study proposed a convolutional neural network(CNN)structure embedded with the module of multi-pooling-PCA for scale variant object *** validation of the proposed network structure is verified by scale variant vehicle image *** with scale invariant network algorithms of Scale-invariant feature transform(SIFT)and FSAF as well as miscellaneous networks,the proposed network can achieve the best recognition accuracy tested by the vehicle scale variant *** testify the practicality of this modified network,the testing of public dataset ImageNet is done and the comparable results proved its effectiveness in general purpose of applications.

关键词： object detection scale invariance spatial pyramid pooling multi-pooling convolutional neural network(CNN)

Analysis of antioxidant prenylflavonoids in different parts of Macaranga tanarius,the plant origin of Okinawan propolis

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Asian Pacific Journal of Tropical Medicine 2014年第1期7卷 16-20页

作者： Shigenori kumazawa Masayo Murase Noboru Momose Syuichi Fukumoto Department of Food and Nutritional Sciences University of Shizuoka52-1 YadaSuruga-kuShizuoka 422-8526.Japan Pokka Sapporo Food and Beverage 45-2 JuunisoKumanoshouKitanagoya-cityAichi 481-8515Japan

Objective:To analyze the antioxidant prenylilavonoids in different parts of Macaranga tanarius(***)(Euphorbiaceae)including the leaf,petiole,stem,leaflet,flower and fruit(only in female plant),and to evaluate their antioxidant ***:Methanol extracts of each part of *** were prepared and five prenylilavonoids in them were quantitatively analyzed using *** fruits from female plant were further separated into seed,pericarp,and glandular *** the quantitative analyses of prenylflavonoids in each part of ***,antioxidant activity of the extracts was evaluated by 2,2-diphenyl-l-picryI-hydrazyl(DPPH)radical scavenging ***:The leaf of *** contained two prenylflavonoids as main components in both male and female *** flowers(male and female)contained five kinds of *** the petiole,stem and leaflet of both male and female plants,the prenylflavonoids were not delected or their amounts were very *** kinds of prenylflavonoids were detected in the seed,pericarp and glandular trichome of female *** particular,the glandular trichome had the highest level of total prenylflavonoids(235 mg/g of fresh plant).DPPH radical scavenging activity of all parts was more than 30%.Conclusions:We found that different parts of *** contained antioxidant *** particular,not only the glandular trichome but also the leaf contained prenylflavonoids,which indicated that *** may be developed as a functional plant,because the leaves of this plant can be easily collected.

关键词： Macaranga tanarius Antioxidant Prenylflavonoid Propolis Plant origin Okinawa