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Failure-tolerant control for small agile satellites using single-gimbal control moment gyros and magnetic torquers

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Acta Mechanica Sinica 2012年第2期28卷 551-558页

作者： Tao Meng saburo Matunaga School of aeronautics and astronautics Zhejiang University310027 HangzhouChina Dept.of Mechanical and Aerospace Engineering Tokyo Institute of TechnologyJapan.Fellow-AIAA.

This paper focuses on the attitude control prob- lem of small agile satellites using single-gimbal control mo- ment gyros （CMG） and magnetic torquers （MTQ）. CMGs are regarded as effective torque generators for agile satel- lites because of their torque amplification capability. How- ever, they are vulnerable to failure due to their complex inner mechanism. In this paper, different failure cases of CMGs are analyzed. A flexible failure-tolerant control strategy is developed by automatically redistributing the required con- trol torque among the operating CMGs and MTQs, with a variable limiter to accommodate the actuator dynamics changes introduced by CMG failures. The performances of maneuvers about different directions under different failure cases are also discussed and examined. Numerical simula- tions demonstrate that the proposed strategy maintains cer- tain agility in the cases of one or two CMGs failing. More- over, a survival strategy with only one CMG left is also ver- ified. Both sun-pointing stabilization and earth-pointing sta- bilization can be achieved in this case, which fulfill some basic mission requirements.

关键词： Attitude control Failure-tolerant. Mixed steer- ing logic CMG. MTQ

Super-High Heat Flux Removal Using Sintered Metal Porous Media

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Journal of Thermal Science 2005年第3期14卷 272-280页

作者： Kazuhisa YUKI Jun ABEI Hidetoshi HASHIZUME saburo TODA Dept. of Quantum Sci. and Energy Eng. Tohoku University Aramaki-Aoba Aoba Sendai 980-8579 Japan DENSO Corporation 1-1 Showa-cho Kariya Aichi 448-8661 JAPANDept. of Quantum Sci. and Energy Eng. Tohoku University Aramaki-Aoba Aoba Sendai 980-8579 JapanTohoku Radiological Science Center 1-1-30 Ichibancho Aoba Sendai 980-1811 Japan

Heat transfer experiments using various porous materials are performed to verify the possibility of extremely high heat flux removal （several dozens of MW/m^2）. The porous media introduced in this experiment are bronze particle-sintered ones and copper fibers-sintered ones that have high thermal conductivity, each of which can enhance the thermal diffusion in the porous material. From the heat transfer experiments using a non-transferred type of plasma arcjet as a high heat flux source, the steady heat removal of 66.0 MV~/m2 is proved by using the bronze porous medium whose pore size and porosity are 100 μm and 0.38, respectively. Furthermore, as the result of evaluating the heat removal performance for various copper fiber porous media with the porosity from 0.5 to 0.7 and the fiber diameter from 30 to 90 μm, it is clarified that the maximum cooling performance exceeds 70.0 MW/m^2 at the porosity of 0.7 and the fiber diameter of 90μm, and that using the lower porosity material is useful for improving an evaporation rate in the porous media.

关键词： heat transfer porous media

An Emergent Framework of Disaster Risk Governance towards Innovating Coping Capability for Reducing Disaster Risks in Local Communities

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International Journal of Disaster Risk Science 2011年第2期2卷 1-9页

作者： saburo Ikeda Toshinari Nagasaka Professor Emeritus University of TsukubaTsukuba 305-8577Japan National Institute for Earth Science and Disaster Prevention Tsukuba 305-0006Japan

An emergent framework of disaster risk governance is presented as an implementation strategy for integrated risk management that incorporates innovative local coping capabilities that reduce disaster vulnerability. This framework calls for enhancement of self-support and mutualassistance through strengthening informal or social networking efforts in local communities, rather than depending on formal or institutional governmental-assistance. The framework is supported by a societal platform of disaster risk information, called DRIP, which the NIED(National Research Institute for Earth Science and Disaster Prevention, Japan) has developed since 2006 as a tool that promotes improved disaster risk governance. With the help of DRIP, residents, communities, and other stakeholders, linked horizontally or vertically with social networks, can(1) improve their awareness of disaster risks and management issues by sharing risk information as scientific expertise, experiential knowledge, and local/folk wisdom;(2) customize risk communication through analytic deliberation of risk information by employing risk-scenarios developed by residents themselves;(3) develo p collaborative activities for informed decision-making that can fully utilize local resources to reorganize coping capability against disaster risks;and(4) disseminate the generated risk scenarios with action plans to other residents who have not participated in the risk communication process.

关键词： disaster utilize mutual

TOWARD THE ESTABLISHMENT OF HERBS AND CROPS ON THE LOESS PLATEAU IN CHINA

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干旱区资源与环境 1993年第Z1期7卷 349-352页

作者： saburo Tamura The University of Tokyo

1. Introduction. The Loess Plateau is covered by the largest (580,000 km^2) and thickest (50-100m)loess deposit on earth. Before the dawn of history, abundant vegetation grew on theplateau. Traditionally, the Loess Plateau is said to be the cradle of the Chinese culture andagriculture. However, due to human impact, especially irrational activities of

关键词： The Loess Plateau Introduction

Study on Targeting and in vitro Anti-oxidation of Baicalin Solid Lipid Nanoparticles

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Chinese Herbal Medicines 2012年第4期4卷 335-339页

作者： MIYAMURA Mitsuhiko YOKOTA Junko YOSHIOKA saburo Department of Pharmacy Kochi Medical School Kochi 783-8505 Japan783850

Objective To prepare liver-targeted baicalin solid lipid nanoparticles(BSLNs) and to study their in vitro anti-oxidative *** BSLNs were prepared by emulsification ultrasonic dispersion method and characterized by transmission electron microscopy and laser particle size distribution;The tissue in vivo distribution was detected by pharmacokinetics;In vitro anti-superoxide dismutase(SOD) activity and reduction capacity of BSLNs were determined;The ability of removing hydroxyl radical was determined by phenanthroline-Fe2+ *** The best prescription was baicalin-soybean lecithin-glyceryl monostearate-poloxamer 188(1:5:15:30);The encapsulation efficiency and drug loading were 84.7% and 5.65%,respectively,mean size of particles was(68.6 ± 8) nm,Zeta potential was 22.13 mV;The in vitro anti-oxidant results showed that BSLNs had a significant inhibitory effect on SOD and a strong reducing capacity as well as a removing hydroxide radical *** targeting rate of BSLNs was 6.931 for *** The results demonstrate that BSLNs could enhance the liver targeting ability and in vitro anti-oxidative activity significantly.

关键词： baicalin in vitro anti-oxidative activity liver-targeted solid lipid nanoparticals tissue distribution

Synthesis of c-Myb Protein(38-89)-NH_2 Using a Partially Protected Peptide Thioester

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Science China Chemistry 1994年第8期37卷 932-939页

作者：张若蘅徐筱杰唐有祺 Hironobo Hojo saburo Aimoto Department of Chemistry Peking UniversityBeijing 100871PRC Institute for Protein Research Osaka University3-2 YamadaokaSuitaOsaka 565Japan

The method of selective modification of eysteine SH group with 4-methylbenzylchloride is developed,c-Myb protein (38-89)-NH_2 is synthesized by using a partially protected peptide *** 4-methylbenzyl (MeBzl) protecting group of cysteine in the building block is stable during the segment cou- *** method can be used in the chemical synthesis of some protein containing cysteine.

关键词： synthesis thioester c-Myb protein

Metallic Contaminant Detection using a High-Temperature Superconducting Quantum Interference Devices Gradiometer

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Chinese Physics Letters 2010年第8期27卷 253-255页

作者： saburo Tanaka Tomohiro Akai Makoto Takemoto Yoshimi Hatsukade Takeyoshi Ohtani Yoshio Ikeda Shuichi Suzuki Toyohashi University of Technology 1-1 Hibarigaoka Tempaku-cho Toyohashi Aichi 441-8580 Japan Advance Food Technology Co. Ltd. Toyohashi Aichi 441-8113 Japan

We develop magnetic metallic contaminant detectors using high-temperature superconducting quantum interference devices （HTS-SQUIDs） for industrial products. Finding ultra-small metallic contaminants is an important issue for manufacturers producing commercial products such as lithium ion batteries. If such contaminants cause damages, the manufacturer of the product suffers a big financial loss due to having to recall the faulty products. Previously, we described a system for finding such ultra-smafi particles in food. In this study, we describe further developments of the system, for the reduction of the effect of the remnant field of the products, and we test the parallel magnetization of the products to generate the remnant field only at both ends of the products. In addition, we use an SQUID gradiometer in place of the magnetometer to reduce the edge effect by measuring the magnetic field gradient. We test the performances of the system and find that tiny iron particles as small as 50 × 50 μm^2 on the electrode of a lithium ion battery could be clearly detected. This detection level is difficult to achieve when using other methods.

关键词： HIGH temperature superconductors SUPERCONDUCTING quantum interference devices PHYSICAL measurements INDUSTRIAL goods LITHIUM-ion batteries MAGNETIZATION PERFORMANCE evaluation

Influence of thin-film device with curvature on natural frequency of rectangle membrane under uniaxial tension

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Astrodynamics 2019年第3期3卷 257-272页

作者： Masanori Matsushita Nobukatsu Okuizumi Yasutaka Satou Osamu Mori Takashi Iwasa saburo Matunaga Institute of Space and Astronautical Science Japan Aerospace Exploration AgencySagamihara252-5210Japan Department of Mechanical and Aerospace Engineering Tottori UniversityTottori680-8552Japan Department of Mechanical Engineering School of EngineeringTokyo Institute of TechnologyTokyo152-8552Japan

A solar power sail demonstrator“IKAROS”demonstrated solar sailing technology in *** membrane of the spinning solar sail IKAROS is estimated to be deformed toward the *** deformation was kept even under low *** studies suggest that curvature of thin-film solar cells on the membrane increases the out-of-plane stiffness by finite element ***,out-of-plane stiffness,and natural frequency of membranes have to be predicted for solar sails with thin-film devices,such as thin-film solar cells,dust counters,and reflectivity control devices in order to reduce the margins of sail size and propellant mass against disturbance solar pressure torque acting on the *** this paper,the effect of a curved thin-film device on the natural frequency of a rectangle membrane under uniaxial tension was *** types of membranes were evaluated:a membrane with a curved thin-film device,a membrane with a flat thin-film device,and a plane *** nonlinear finite element analysis and eigenvalue analysis were conducted to investigate the natural frequencies under varying *** simulations were verified by vibration *** was found that under low tension,the natural frequency of the membrane with the curved thin-film device is significantly higher than that of the others and that under high tension,the natural frequency of the membrane with the thin-film device is slightly lower than that of the plane *** addition,parametric analysis on the curvature of the thin-film device shows that natural frequency at low tension is sensitive to the *** eigenvalue analysis of a whole solar sail with the curved thin-film devices also suggests that the curvature remarkably affects the vibration *** conclusion,curved thin-film devices have a significant impact on the out-of-plane stiffness of a membrane under low tension.

关键词： membrane structures thin-film device vibration eigenvalue analysis experiment

Recent Progress of Thioester Method

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Chemical Research in Chinese Universities 2006年第2期22卷 253-257页

作者： saburo Aimoto Kenta Teruya Koki Hasegawa Takeshi Sato Kenichi Akaji Toru Kawakami Institute for Protein Research Osaka University Suita Osaka 565-0871 Japan

Introduction The availability of site-specifically modified peptides is of vital importance for biochemical and biophysical studies. Biological methods, such as expression using bacteria, are useful. They are, however, not always applicable to the synthesis of peptides with sitespecific modifications. Chemical methods can be viable alternatives to those biological approaches. Peptides obtained by chemical and biological means,

关键词： Thioester method Thiol linker Peptide