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Hayabusa2’s superior solar conjunction mission operations: Planning and post-operation results

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Astrodynamics 2020年第4期4卷 265-288页

作者： Stefania Soldini Hiroshi Takeuchi Sho Taniguchi Shota Kikuchi Yuto Takei Go Ono Masaya Nakano Takafumi Ohnishi Takanao Saiki Yuichi Tsuda Fuyuto Terui Naoko OgawaYuya MimasuTadateru Takahashi Atsushi Fujii Satoru NakazawaKent Yoshikawa Yusuke Oki Chikako Hirose hirotaka sawada Tomohiro Yamaguchi Makoto Yoshikawa Department of Mechanical Materials and Aerospace EngineeringUniversity of LiverpoolLiverpool L693BXUK Institute of Space and Astronautical Science Japan Aerospace Exploration AgencySagamihara 252-5210Japan Fujitsu Limited Tokyo 105-7123Japan Mitsubishi Electric Corporation Tokyo 100-8310Japan

In late 2018,the asteroid Ryugu was in the Sun's shadow during the superior solar conjunction *** the Sun-Earth-Ryugu angle decreased to below 3°,the Hayabusa2 spacecraft experienced 21 days of planned blackout in the Earth-probe communication *** was the first time a spacecraft had experienced solar conjunction while hovering around a minor *** the safety of the spacecraft,a low energy transfer trajectory named Ayu was designed in the Hill reference frame to increase its altitude from 20 to 110 *** trajectory was planned with the newly developed optNEAR tool and validated with real time *** article shows the results of the conjunction operation,from planning to fight data.

关键词： superior solar conjunction Hayabusa2 Ryugu hovering satellite mission operations

Motion reconstruction of the small carry-on impactor aboard Hayabusa2

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Astrodynamics 2020年第4期4卷 289-308页

作者： Takanao Saiki Yuya Mimasu Yuto Takei Manabu Yamada hirotaka sawada K azunori Ogawa Naoko Ogawa Hiroshi Takeuchi Akira Miura Yuri Shimaki Koji Wada Rie Honda Yasuhiro Yokota Kei Shirai Naruhisa Sano Hirohito Ohtsuka Go Ono Kent Yoshikawa Shota Kikuchi Chikako Hirose Yukio Yamamoto Takahiro Iwata Masahiko Arakawa Seiji Sugita Satoshi Tanaka Fuyuto Terui Makoto Yoshikawa Satoru Nakazawa Sei-ichiro Watanabe Yuichi Tsuda Japan Aerospace Exploration Agency Sagamihara 252-5210Japan Chiba Institute of Technology Narashino 275-0016Japan Kobe University K obe 657-8501Japan The Graduate University for Aduanced Studies Sagamihara 252-5210Japan Kochi University Kochi 780-8520Japan IHI Aerospace Co. LtdTomioka 370-2398Japan The University of Tokyo Tokyo 113-0033Japan Nagoya University Nagoya 464-8601Japan

Subsurface exploration is one of the most ambitious scientific objectives of the Hayabusa2 mission.A small device called small carry-on impactor(SCI)was developed to create an artificial crater on the surface of asteroid *** enables us to sample subsurface materials,which will provide a window to the *** physical properties of the resulting crater are also useful for understanding the internal structure of *** understanding of the crater and ejecta properties,including the depth of excavation of subsurface materials,requires accurate information on impact *** particular,the impact angle is a critical factor because it greatly influences the size and shape of the *** April 5,2019,the Hayabusa2 spacecraft deployed the SCI at 500 m of altitude above the asteroid *** SCI gradually reduced its altitude,and it shot a 2 kg copper projectile into the asteroid 40 min after *** the position of the released SCI is essential for determining the impact *** study describes the motion reconstruction of the SCI based on the actual operation *** results indicate that the SCI was released with high accuracy.

关键词： small body exploration Hayabusa2 kinetic impact artificial crater motion reconstruction

High-grade pancreatic intraepithelial neoplasia diagnosed based on changes in magnetic resonance cholangiopancreatography findings:A case report

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World Journal of Clinical Cases 2024年第8期12卷 1487-1496页

作者： Nao Furuya Atsushi Yamaguchi Naohiro Kato Syuhei Sugata Takuro Hamada Takeshi Mizumoto Yuzuru Tamaru Ryusaku Kusunoki Toshio Kuwai hirotaka Kouno Kazuya Kuraoka Yoshiyuki Shibata Sho Tazuma Takeshi Sudo Hiroshi Kohno Shiro Oka Department of Gastroenterology National Hospital Organization Kure Medical Center and Chugoku Cancer CenterKure 737-0023HiroshimaJapan Department of Gastroenterology Hiroshima University HospitalHiroshima 734-8551HiroshimaJapan Department of Pathology National Hospital Organization Kure Medical Center and Chugoku Cancer CenterKure 737-0023HiroshimaJapan Department of Surgery National Hospital Organization Kure Medical Center and Chugoku Cancer CenterKure 737-0023HiroshimaJapan

BACKGROUND High-grade pancreatic intraepithelial neoplasia(PanIN)exhibits no mass and is not detected by any examination ***,it can be diagnosed by pancreatic juice cytology from indirect *** previous cases were diagnosed based on findings of a focal stricture of the main pancreatic duct(MPD)and caudal MPD dilatation and subsequent pancreatic juice cytology using endoscopic retrograde cholangiopancreatography(ERCP).We experienced a case of high-grade PanIN with an unclear MPD over a 20-mm range,but without caudal MPD dilatation on magnetic resonance cholangiopancreatography(MRCP).CASE SUMMARY A 60-year-old female patient underwent computed tomography for a follow-up of uterine cancer post-excision,which revealed pancreatic *** revealed an unclear MPD of the pancreatic body at a 20-mm length without caudal MPD ***,course observation was *** 24 mo,MRCP revealed an increased caudal MPD caliber and a larger pancreatic *** performed ERCP and detected atypical cells suspected of adenocarcinoma by serial pancreatic juice aspiration cytology *** performed a distal pancreatectomy and obtained a histopathological diagnosis of high-grade *** parenchyma invasion was not observed,and curative resection was *** High-grade Pan-IN may cause MPD narrowing in a long range without caudal MPD dilatation.

关键词： Pancreatic cancer Pancreatic intraepithelial neoplasm High-grade pancreatic intraepithelial neoplasm Magnetic resonance cholangiopancreatography Carcinoma in situ Case report

Hayabusa2’s station-keeping operation in the proximity of the asteroid Ryugu

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Astrodynamics 2020年第4期4卷 349-375页

作者： Yuto Takei Takanao Saiki Yukio Yamamoto Yuya Mimasu Hiroshi Takeuchi Hitoshi Ikeda Naoko Ogawa Fuyuto Terui Go Ono Kent Yoshikawa Tadateru Takahashi hirotaka sawada Chikako Hirose Shota Kikuchi Atsushi Fuji Takahiro Iwata Satoru Nakazawa Masahiko Hayakawa Ryudo Tsukizaki Satoshi Tanaka Masanori Matsushita Osamu Mori Daiki Koda Takanobu Shimada Masanobu Ozaki Masanao Abe Satoshi Hosoda Tatsuaki Okada Hajime Yano Takaaki Kato Seiji Yasuda Kota Matsushima Tetsuya Masuda Makoto Yoshikawa Yuichi Tsuda Japan Aerospace Exploration Agency Sagarmihara 252-5210Japan The Graduate University for Advanced Studies Sagarmihara 252-5210Japan NEC Aerospace Systems LtdFruchu 183-8502Japan NEC Corporation Puchu 183-8501Japan

The Japanese interplanetary probe Hayabusa2 was launched on December 3,2014 and the probe arrived at the vicinity of asteroid 162173 Ryugu on June 27,*** its 1.4 years of asteroid proximity phase,the probe successfully accomplished numbers of record-breaking achievements including two touchdowns and one artificial cratering experiment,which are highly expected to have secured surface and subsurface samples from the asteroid inside its sample container for the first time in *** Hayabusa2 spacecraft was designed not to orbit but to hover above the asteroid along the sub Earth *** orbital and geometrical configuration allows the spacecraft to utilize its high-gain antennas for telecommunication with the ground station on Earth while pointing its scientific observation and navigation sensors at the *** paper focuses on the regular station-keeping operation of Hayabusa2,which is called“home position”(HP)-keeping ***,together with the spacecraft design,an operation scheme called HP navigation(HPNAV),which includes a daily trajectory control and scientific observations as regular activities,is *** the description on the guidance,navigation,and control design as well as the framework of optical and radiometric navigation,the results of the HP-keeping operation including trajectory estimation and delta-V planning during the entire asteroid proximity phase are summarized and evaluated as a first ***,this paper states that the *** operation in the framework of HPNAV had succeeded without critical incidents,and the number of trajectory control delta-V was planned fficiently throughout the period.

关键词： small body mission station-keeping guidance,navigation,and control(GNC) optical and radiometric navigation

Synthesis strategies of covalent organic frameworks: An overview from nonconventional heating methods and reaction media

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Green Energy & Environment 2023年第6期8卷 1596-1618页

作者： Jing Xiao Jia Chen Juewen Liu hirotaka Ihara Hongdeng Qiu CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Department of Chemistry Waterloo Institute for NanotechnologyUniversity of WaterlooWaterlooOntario N2L 3G1Canada Department of Applied Chemistry and Biochemistry Kumamoto University2-39-1 KurokamiChuo-ku Kumamoto 860-8555Japan College of Chemistry Zhengzhou UniversityZhengzhou 450001China

Covalent organic frameworks(COFs), as an emerging class of porous crystalline materials constructed by covalent links between the building monomers, have gained tremendous attention. Over the past 15 years, COFs have made rapid progress and substantial development in the chemistry and materials fields. However, the synthesis of COFs has been dominated by solvothermal methods for a long time and it usually involves high temperature, high pressure and toxic organic solvents, which created many challenges for environmental considerations. Recently,the exploration of new approaches for facile fabrication of COFs has aroused extensive interest. Hence, in this review, we comprehensively describe the synthetic strategies of COFs from the aspects of nonconventional heating methods and reaction media. In addition, the advantages,limitations and properties of the preparation methods are compared. Finally, we outline the main challenges and development prospects of the synthesis of COFs in the future and propose some possible solutions.

关键词： Covalent organic frameworks Heating methods Reaction media Synthesis strategy Formation mechanism

An Unusual Acceleration of Amination Reactivity by the Proximal Ester Groups in Catechol Diesters: An Efficient Way for Peptide Synthesis

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Precision Chemistry 2023年第2期1卷 100-106页

作者： An Wu hirotaka Ikeda Hisashi Yamamoto Peptide Research Center Chubu UniversityKasugaiAichi 487-8501Japan Materials Science Department MOLSIS Inc.Chuo-kuTokyo 104-0032Japan

Peptide bond formation has drawn more and more attention due to its importance in medicinal chemistry and drug *** active esters to construct peptide bonds is an indispensable strategy in this *** herein report a fast and efficient amination reaction to synthesize peptides from catechol *** monoesters are good active esters in peptide synthesis due to the anchimeric assistance *** previously reported work,the amination reaction was inactivated if the 2-hydroxyl group in the catechol esters was ***,we found an unusual acceleration of the amination reactivity when the 2-hydroxyl group was functionalized as an ester *** reaction can be complete in 2−3 min in some *** acceleration was found through experimental studies to not result from the anchimeric assistance *** proposed aπ*−π*interaction pathway between the two proximal ester *** computational studies were made to support this assumption.

关键词： catechol diesters peptide synthesis amination π*−π*interaction proximal ester groups

Integration of body-mounted ultrasoft organic solar cell on cyborg insects with intact mobility

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npj Flexible Electronics 2022年第1期6卷 726-734页

作者： Yujiro Kakei Shumpei Katayama Shinyoung Lee Masahito Takakuwa Kazuya Furusawa Shinjiro Umezu hirotaka Sato Kenjiro Fukuda Takao Someya Center for Emergent Matter Science RIKEN2-1 HirosawaWakoSaitama 351-0198Japan Department of Integrative Bioscience and Biomedical Engineering Center for Advanced Biomedical SciencesTWIns Waseda Univerisity2-2 Wakamatsu-choShinjuku-kuTokyo 162-8480Japan Department of Modern Mechanical Engineering Waseda University3-4-1 OkuboShinjuku-kuTokyo 169-8555Japan Department of Applied Chemistry and Food Science Faculty of Environmental and Information SciencesFukui University of Technology3-6-1 GakuenFukui 910-8505Japan School of Mechanical and Aerospace Engineering Nanyang Technological UniversityN3.2-01-2065 Nanyang DriveSingapore 637460Singapore Thin-Film Device Laboratory RIKEN2-1 HirosawaWakoSaitama 351-0198Japan Electrical and Electronic Engineering and Information Systems The University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-8656Japan

Cyborg insects have been proposed for applications such as urban search and ***-mounted energy-harvesting devices are critical for expanding the range of activity and functionality of cyborg ***,their power outputs are limited to less than 1 mW,which is considerably lower than those required for wireless locomotion *** area and load of the energy harvesting device considerably impair the mobility of tiny ***,we describe the integration of an ultrasoft organic solar cell module on cyborg insects that preserves their motion *** quantified system design strategy,developed using a combination of ultrathin film electronics and an adhesive-nonadhesive interleaving structure to perform basic insect motion,successfully achieved the fundamental locomotion of traversing and *** body-mounted ultrathin organic solar cell module achieves a power output of 17.2 *** demonstrate its feasibility by displaying the recharging wireless locomotion control of cyborg insects.

关键词： mounted harvesting considerably

Alloyed nanostructures integrated metal-phenolic nanoplatform for synergistic wound disinfection and revascularization

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Bioactive Materials 2022年第10期7卷 95-106页

作者： Yi Xie Shengqiu Chen Xu Peng Xiaoling Wang Zhiwei Wei Joseph J.Richardson Kang Liang hirotaka Ejima Junling Guo Changsheng Zhao College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengduSichuan610065China BMI Center for Biomass Materials and Nanointerfaces College of Biomass Science and EngineeringSichuan UniverisityChengduSichuan610065China Laboratory Animal Center Sichuan UniversityChengduSichuan610065China School of Chemical Engineering Graduate School of Biomedical Engineeringand Australian Centre for NanoMedicineUniversity of New South WalesSydneyNSW2052Australia Department of Materials Engineering School of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo113􀀀8656Japan Bioproducts Institute Departments of Chemical and Biological EngineeringThe University of British ColumbiaVancouverBCV6T 1Z4Canada School of Chemical Engineering Sichuan UniversityChengduSichuan610065China

New materials for combating bacteria-caused infection and promoting the formation of microvascular networks during wound healing are of vital *** antibiotics can be used to prevent infection,treatments that can disinfect and accelerate wound healing are ***,we engineer a coating that is both highly compatible with current wound dressing substrates and capable of simultaneously disinfecting and revascularizing wounds using a metal-phenolic nanoplatform containing an alloyed nanostructured architecture(Ag@Cu-MPNNC).The alloyed nanostructure is formed by the spontaneous co-reduction and catalytic disproportionation reaction of multiple metal ions on a foundation metal-phenolic supramolecular *** synergistic presence of metals greatly improves the antibacterial activity against both Gram-negative and Gram-positive pathogenic bacteria,while demonstrating negligible cytotoxicity to normal *** infected rat models,the Ag@Cu-MPNNC could kill bacteria efficiently,promoting revascularization and accelerate wound closure with no adverse side effects in infected in vivo *** other words,this material acts as a combination therapy by inhibiting bacterial invasion and modulating bio-nano interactions in the wound.

关键词： Metal-phenolic network Wound healing Antibacterial activity Revascularization

Structural Health Monitoring by Using Fiber-Optic Distributed Strain Sensors With High Spatial Resolution

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Photonic Sensors 2013年第4期3卷 355-376页

作者： Hideaki MURAYAMA Daichi WADA hirotaka IGAWA School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Japan Aerospace Exploration Agency 6-13-10hsawa Mitaka Tokyo 181-0015 Japan

In this paper, we review our researches on the topics of the structural health monitoring (SHM) with the fiber-optic distributed strain sensor. Highly-dense information on strains in a structure can be useful to identify some kind of existing damages or applied loads in implementation of SHM. The fiber-optic distributed sensors developed by the authors have been applied to the damage detection of a single-lap joint and load identification of a beam simply supported. We confirmed that the applicability of the distributed sensor to SHM could be improved as making the spatial resolution higher. In addition, we showed that the simulation technique considering both structural and optical effects seamlessly in strain measurement could be powerful tools to evaluate the performance of a sensing system and design it for SHM. Finally, the technique for simultaneous distributed strain and temperature measurement using the PANDA-fiber Bragg grating (FBG) is shown in this paper, because problems caused by the cross-sensitivity toward strain and temperature would be always inevitable in strain measurement for SHM.

关键词：结构健康监测光纤应变传感高空间分辨率光纤分布式分布式光纤传感器光纤布拉格光栅器具分布式传感器