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春琴抄

Orbit insertion strategy of Hayabusa2’s rover with large release uncertainty around the asteroid Ryugu

2018年

作者：谷崎润一郎(junichiro Tanizaki)

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Astrodynamics 2020年第4期4卷 309-329页

作者： Yusuke Oki Kent Yoshikawa Hiroshi Takeuchi Shota Kikuchi Hitosi Ikeda Daniel JScheeres Jay WMcMahon junichiro Kawaguchi Yuto Takei Yuya Mimasu Naoko Ogawa Go Ono Fuyuto Terui Manabu Yamada Toru Kouyama Shingo K ameda Kazuya Yoshida Kenji Nagaoka Tetsuo Yoshimitsu Takanao Saiki Yuichi Tsuda Japan A erospace Exploration Agency T'sukuba 305-8505Japan Japan Aerospace Exploration Agency Sagamihara 252-5210Japan University of Colorado BoulderCO 80309USA Planetary Exploration Research Center Chiba Institute of TechnologyNarashino 275-0016Japan National Institute of Aduanced Industrial Science and Technology Koto-ku 135-0064Japan Rikkyo University Toshima-ku 171-8501Japan Department of A erospace Engineering Tohoku UniversitySendai 980-8579Japan Kyushu Institute of Technology Kitakyusyu 804-8550Japan

This paper describes the orbit design of the deployable payload Rover 2 of MINERVA-II,installed on the Hayabusa2 *** Rover 2 did not have surface exploration capabilities,the operation team decided to experiment with a new strategy for its deployment to the *** rover was ejected at a high altitude and made a semi-hard landing on the surface of the asteroid Ryugu after several *** on the orbital analysis around Ryugu,the expected collision speed was tolerable for the rover to function *** the rover could not control its position,its motion was entirely governed by the initial ***,the largest challenge was to insert the rover into a stable orbit(despite its large release uncertainty),and avoid its escape from Ryugu due to an environment strongly perturbed by solar radiation pressure and gravitational *** study investigates the solution space of the orbit around Ryugu and evaluates the orbit’s robustness by utilizing Monte Carlo simulations to determine the orbit insertion *** analyzing the flight data of the rover operation,we verified that the rover orbited Ryugu for more than one period and established the possibility of a novel method for estimating the gravity of an asteroid.

关键词： solar radiation pressure augmented elliptic Hill three-body problem gravitational irregularity

Electrical Stimulation in Addition to Passive Exercise Has a Small Effect on Spasticity and Range of Motion in Bedridden Elderly Patients: A Pilot Randomized Crossover Study

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Health 2019年第8期11卷 1072-1086页

作者： Hideki Kataoka Shunpei Nakashima Hideki Aoki Kyo Goto junichiro Yamashita Yuichiro Honda Yasutaka Kondo Tatsuya Hirase Junya Sakamoto Minoru Okita Department of Rehabilitation Nagasaki Memorial Hospital Nagasaki Japan Department of Physical Therapy Science Nagasaki University Graduate School of Biomedical Sciences Nagasaki Japan Department of Rehabilitation Nagasaki University Hospital Nagasaki Japan Department of Rehabilitation Nagasaki Genbaku Hospital Nagasaki Japan Institute of Biomedical Sciences Nagasaki University Nagasaki Japan

Purpose: Belt electrode skeletal muscle electrical stimulation (B-SES) can stimulate large portions of muscles including deep sites without localisation of the stimulation area. The purpose of this study is to investigate both immediate treatment effects of B-SES and long-term treatment effects of B-SES with passive exercise on range of motion (ROM) and muscle tone of lower extremities in bedridden elderly patients. Methods: Outcome measures before and after B-SES treatment alone (4 Hz, 20 min, both lower extremities) were examined for the immediate effect. Outcome measures were: ROM and Modified Ashworth scale (MAS) of hip flexion and adduction;knee flexion and extension;and knee joint distance at position of flexion abduction in hip (distance of knee). A randomized crossover trial was conducted to examine the long-term effect of adding B-SES to passive exercise on ROM and MAS. Results and Discussion: The immediate effect study had 18 patients. ROM and MAS of 4 joint angles in 2 joints and distance of knee significantly improved after B-SES treatment. The long-term effect study had 11 patients. Friedman test revealed ROM and MAS of 4 joint angles in 2 joints and distance of knee significantly improved during B-SES intervention but not control intervention. B-SES in addition to passive stretch has a more statistically significant effect on contracture and spasticity in large portions of the lower extremities of bedridden elderly patients than passive stretching alone. Conclusions: We consider B-SES a useful tool to improve the ROM in lower extremities of bedridden patients.

关键词： Bedridden Patients Belt Electrode Skeletal Muscle Electrical Stimulation Lower Extremity Muscle Tone Restriction of Range of Joint Motion

Terahertz spin dynamics in rare-earth orthoferrites

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Photonics Insights 2022年第2期1卷 1-56页

作者： Xinwei Li Dasom Kim Yincheng Liu junichiro Kono Department of Physics California Institute of TechnologyPasadenaUSA Department of Electrical and Computer Engineering Rice UniversityHoustonUSA Applied Physics Graduate Program Smalley-Curl InstituteRice UniversityHoustonUSA Department of Physics and Astronomy Rice UniversityHoustonUSA Department of Materials Science and NanoEngineering Rice UniversityHoustonUSA

Recent interest in developing fast spintronic devices and laser-controllable magnetic solids has sparked tremendous experimental and theoretical efforts to understand and manipulate ultrafast dynamics in *** of spin dynamics in the terahertz(THz)frequency range are particularly important for elucidating microscopic pathways toward novel device ***,we review THz phenomena related to spin dynamics in rare-earth orthoferrites,a class of materials promising for antiferromagnetic *** expand this topic into a description of four key elements.(1)We start by describing THz spectroscopy of spin excitations for probing magnetic phase transitions in thermal *** acoustic magnons are useful indicators of spin reorientation transitions,electromagnons that arise from dynamic magnetoelectric couplings serve as a signature of inversion-symmetry-breaking phases at low temperatures.(2)We then review the strong laser driving scenario,where the system is excited far from equilibrium and thereby subject to modifications to the free-energy *** pathways for ultrafast laser manipulation of magnetic order are discussed.(3)Furthermore,we review a variety of protocols to manipulate coherent THz magnons in time and space,which are useful capabilities for antiferromagnetic spintronic applications.(4)Finally,new insights into the connection between dynamic magnetic coupling in condensed matter and the Dicke superradiant phase transition in quantum optics are *** presenting a review on an array of THz spin phenomena occurring in a single class of materials,we hope to trigger interdisciplinary efforts that actively seek connections between subfields of spintronics,which will facilitate the invention of new protocols of active spin control and quantum phase engineering.

关键词： terahertz spin dynamics magnetism orthoferrite ultrafast spectroscopy magneto-optics

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考虑箍筋效应的PP-ECC梁抗剪试验研究

中国公路学报 2017年第12期30卷 234-241,249页

作者：张锐孟庆利何畏二羽淳一郎西南交通大学土木工程学院四川成都610031 西南科技大学土木工程与建筑学院四川绵阳621010 东京工业大学东京152-8552

为了研究钢筋加强工程水泥基复合材料(ECC)梁中的箍筋抗剪加强效应,针对发生剪切破坏的普通钢筋混凝土(RC)构件,考虑箍筋率的影响,分别进行RC与ECC梁的四点加载试验研究。首先开展ECC材料试验,采用直接拉伸的加载方式,对聚丙烯纤维工程... 详细信息

为了研究钢筋加强工程水泥基复合材料(ECC)梁中的箍筋抗剪加强效应,针对发生剪切破坏的普通钢筋混凝土(RC)构件,考虑箍筋率的影响,分别进行RC与ECC梁的四点加载试验研究。首先开展ECC材料试验,采用直接拉伸的加载方式,对聚丙烯纤维工程水泥基复合材料(PP-ECC)的拉伸力学性能进行试验研究。在材料试验结果的基础上,通过考虑箍筋效应,分别设计5根不同箍筋率的钢筋增强PP-ECC梁和2根普通钢筋混凝土梁试件,对7根梁进行四点加载试验,并在加载过程中对5根PP-ECC梁的斜裂缝进行观测,分析箍筋率对ECC梁斜裂缝开展行为的影响。通过修正桁架模型,分析箍筋率对ECC梁抗剪承载力的影响。试验结果表明:PP-ECC具有拟应变硬化和微裂缝的多缝开裂特征,其屈服拉伸强度和拉伸极限强度分别不小于2,3MPa,极限拉应变大于2.5%;PP-ECC梁有较好的剪切延性,随着箍筋率的增长,PP-ECC梁的抗剪承载力也逐渐加大;在相同箍筋率下PP-ECC梁的抗剪承载力大于RC梁,而无箍筋PP-ECC梁的抗剪承载力2倍于无箍筋RC梁;由于箍筋限制了R/ECC梁斜裂缝的开展,加剧了斜裂缝的剪切滑移,从而削弱了斜裂缝间的纤维桥接作用,导致PP-ECC承担的剪力随着箍筋率的增大而减小;现有规范未考虑斜裂缝的剪切滑移对PP-ECC抗剪承载力的削弱作用,使得计算剪切承载力过大而导致偏危险。

关键词：桥梁工程钢筋PP-ECC梁四点加载剪切滑移箍筋效应

Antithrombotic Effects of Different Strains of Lactic Acid Bacteria

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Health 2014年第18期6卷 2433-2443页

作者： Hiromasa Ooe Masaru Kato Kanae Hyodo Keiko Nakashima Hiroshi Ashigai Kyoko Kato Toshinori Sasaki Yuko Fukushima John C. Giddings junichiro Yamamoto Research Laboratories for Health Science and Food Technologies Kirin Company Limited Yokohama Japan Research Laboratories for Brewing Technologies Kirin Company Limited Yokohama Japan Laboratory of Physiology Faculty of Nutrition Kobe Gakuin University Kobe Japan Central Laboratories for Key Technologies Kirin Company Limited Yokohama Japan Formerly Department of Haematology School of Medicine Cardiff University UK

Objective: The aim of the present study was to assess the antithrombotic properties of different strains of orally available antithrombotic lactic acid bacteria (LAB). Research Methods & Procedures: Antithrombotic activity, antiplatelet reactivity and/or thrombolytic activity, were measured in seven strains of LAB and LAB cell-free-extracts (LAB filtrates) using the shear-induced platelet reactivity/thrombolytic activity, The Global Thrombosis Test (GTT), with non-anticoagulated rat blood in vitro. Subsequently, the most potent antithrombotic strains identified in vitro were assessed in vivo after oral administration in mouse carotid arteries using a helium-neon laser-induced thrombosis model. Result: Five strains out of seven LAB (Lactobacillus paracasei KW 3100, Lactobacillus fermentum NBRC 3961, Lactobacillus pentosus JCM 8333, Leuconostoc oeni Elios 1, Pediococcus pentosaceus NK-2) promoted significant endogenous thrombolysis in vitro. In addition, one strain (Lactobacillus fermentum NBRC 3961) significantly inhibited shear-induced platelet re-activity. Three antithrombotic strains, Lactobacillus fermentum NBRC 3961, Leuconostoc oeni Elios 1, and Lactobacillus pentosus JCM 8333, were further assessed in vivo. The results demonstrated that filtrates, and the cells per se of these LAB, modulated antiplatelet activity and/or thrombolytic activity, and that the antithrombotic mechanisms were mainly influenced by protein content (60% - 70% of dry matter). Conclusion: The findings suggested that some strains of lactic acid bacteria could usefully provide the basis for the production of oral antithrombotic probiotics.

关键词： Antithrombotic Lactic Acid Bacteria Shear-Induced Thrombosis Global Thrombosis Test (GTT) Laser-Induced Thrombosis Endogenous Thrombolysis

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焦炭过滤床在线分离电炉粉尘中氧化锌的研究

钢铁 2008年第4期43卷 89-92页

作者：孟繁明王文忠八木顺一郎东北大学材料与冶金学院辽宁沈阳110004 东北大学多元物质科学研究所日本仙台980-8577

采用电炉粉尘与焦炭粉的混合试样,对利用焦炭过滤床在线回收电炉粉尘,在CO/CO2混合气体中氧化锌的还原分离工艺进行了模拟研究。热力学分析表明,在所设焦炭过滤床的温度及气氛条件下,固-固还原和气-固还原反应都可以发生,氧化锌的还原... 详细信息

采用电炉粉尘与焦炭粉的混合试样,对利用焦炭过滤床在线回收电炉粉尘,在CO/CO2混合气体中氧化锌的还原分离工艺进行了模拟研究。热力学分析表明,在所设焦炭过滤床的温度及气氛条件下,固-固还原和气-固还原反应都可以发生,氧化锌的还原分离是可以实现的。实验结果表明,与单独被固体碳或CO还原时相比较,混合试样在固体碳和CO同时存在时的初期减重率变化最快,最终还原率最高。在粉尘颗粒表面,被还原的金属铁生成及聚积长大后,将对还原气体向颗粒内部进一步扩散起到阻碍作用,对颗粒内部残存的微量ZnO的还原产生不利影响。如何加快氧化锌的还原分离而抑制氧化铁的还原及聚集长大将成为提高氧化锌回收率的关键。

关键词：电炉粉尘氧化锌分离在线回收焦炭过滤床

微卫星DNA多态性在近交系长爪沙鼠遗传检测中的应用

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浙江省医学科学院学报 2007年第4期18卷 10-14页

作者：丁贤明钱宝珍 junichiro Matsuda Koura Minako 浙江省医学科学院生物工程研究所杭州310013 日本国家实验动物中心

目的监测近交系长爪沙鼠的遗传质量状况，验证微卫星标记技术在近交系长爪沙鼠遗传检测中应用的可靠性。方法选取长爪沙鼠17个微卫星位点，应用PCR技术对日本国家实验动物中心（NIBIO）培育而成的3个近交系长爪沙鼠品系：MGB（白毛品系... 详细信息

目的监测近交系长爪沙鼠的遗传质量状况，验证微卫星标记技术在近交系长爪沙鼠遗传检测中应用的可靠性。方法选取长爪沙鼠17个微卫星位点，应用PCR技术对日本国家实验动物中心（NIBIO）培育而成的3个近交系长爪沙鼠品系：MGB（白毛品系）、MGW（黑毛品系）、MGR（毛色为棕色），进行遗传质量分析。结果在所选的17个微卫星位点中，共有8个位点获得稳定的扩增结果，其中AF200941、AF200945、AF200946、D11Mit128和SCN五个位点在群体内表现为单态纯合，片段大小在140～215bp之间；AF200942、AF200946和AF200947三个位点在群体内表现为单态杂合，片段大小在203～241bp之间，所有位点在群体内和群体间均呈单态性。结论这3个长爪沙鼠品系基本符合近交系的要求，微卫星标记技术适用于近交系长爪沙鼠的遗传检测。

关键词：微卫星DNA 长爪沙鼠近交系遗传检测

A unique case of a calcifying cystic odontogenic tumor

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Open Journal of Stomatology 2013年第6期3卷 314-317页

作者： Shoko Gamoh Yukako Nakashima Hironori Akiyama Kimishige Shimizutani Takuro Sanuki junichiro Kotani Koji Yamada Shosuke Morita Kazuya Tominaga Masahiro Wato Akio Tanaka Department of Anesthesiology Osaka Dental University Osaka Japan Department of Oral and Maxillofacial Surgery Osaka Dental University Osaka Japan Department of Oral Pathology Osaka Dental University Osaka Japan Department of Oral Radiology Osaka Dental University Osaka Japan

The calcifying odontogenic cyst was first reported by Gorlin et al. in 1962. At that time, it was classified as a cyst related to the odontogenic apparatus, although it was later renamed as a calcifying cystic odontogenic tumor by the WHO calcification in 2005 due to its histological complexity, morphological diversity and aggressive proliferation [2]. Here, we describe a case of a calcifying cystic odontogenic tumor in a 4- year-old boy. The lesion was surgically removed, and the histopathological examination revealed it to be a cystic tumor with ghost cells, a stellate reticulum and small amount of dentinoid tissue in the cystic wall.

关键词： Calcifying Cystic Odontogenic Tumor Diagnostic Imaging Computed Tomography