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Application of Simple Adaptive Control to Water Hydraulic Servo Cylinder System

Chinese Journal of Mechanical Engineering 2012年第5期25卷 882-888页

作者： ITO Kazuhisa YAMADA Tsuyoshi IKEO Shigeru takahashi Koji College of Systems Engineering and Science Shibaura Institute of Technology Saitama 3378570 Japan Graduate School of Mechanical Engineering Tottori UniversityTottori 6808552 Japan Department of Mechanical Engineering Sophia UniversityTokyo 1028554 Japan

Although conventional model reference adaptive control （MRAC） achieves good tracking performance for cylinder control, the controller structure is much more complicated and has less robustness to disturbance in real applications. This paper discusses the use of simple adaptive control （SAC） for positioning a water hydraulic servo cylinder system. Compared with MRAC, SAC has a simpler and lower order structure, i.e., higher feasibility. The control performance of SAC is examined and evaluated on a water hydraulic servo cylinder system. With the recent increased concerns over global environmental problems, the water hydraulic technique using pure tap water as a pressure medium has become a new drive source comparable to electric, oil hydraulic, and pneumatic drive systems. This technique is also preferred because of its high power density, high safety against fire hazards in production plants, and easy availability. However, the main problems for precise control in a water hydraulic system are steady state errors and overshoot due to its large friction torque and considerable leakage flow. MRAC has been already applied to compensate for these effects, and better control performances have been obtained. However, there have been no reports on the application of SAC for water hydraulics. To make clear the merits of SAC, the tracking control performance and robustness are discussed based on experimental results. SAC is confirmed to give better tracking performance compared with PI control, and a control precision comparable to MRAC （within 10 μm of the reference position） and higher robustness to parameter change, despite the simple controller. The research results ensure a wider application of simple adaptive control in real mechanical systems.

关键词： water hydraulics servo cylinder system positioning control simple adaptive control

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Permeability differences based on three-dimensional geometrical information of void spaces

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第2期13卷 368-376页

作者： Dae-Sung Cheon Manabu takahashi Taehyun Kim Geology Division Korea Institute of Geoscience and Mineral ResourcesDaejeonSouth Korea Hydrology Research Group National Institute of Advanced Industrial Science and TechnologyTsukubaJapan Radwaste Disposal Research Division Korea Atomic Energy Research InstituteDaejeonSouth Korea

In this study,the permeabilities of Berea and Otway sandstones were measured under different confining pressures,and porosity was investigated through mercury intrusion porosimetry(MIP).The total porosities of the Berea and Otway sandstones were approximately 17.4%and 25%,*** size distributions of each sandstone were almost the same,but the pores in the Otway sandstone were slightly ***,the permeability of the Otway sandstone was smaller than that of the Berea sandstone by one order of ***-dimensional(3D)void geometry and geometrical properties of the void spaces relevant to flow were compared to obtain the relation between the permeability differences and porosities of the two *** 3D geometrical analysis using microfocus X-ray computed tomography(CT)was performed,and the pore geometries of both sandstones were compared using the 3D medial axis(3DMA)*** and throat radii,pore coordination number,tortuosity,number of connecting paths,connecting path volume,and other factors were determined using *** Otway sandstone was characterized by a small effective throat/pore radius *** on the fluid flow mechanism,the lower effective throat/pore radius ratio results in a lower permeability induced by the fluid energy loss,which means that the 3D geometrical shape of void spaces affects the permeability value.

关键词： X-ray computed tomography(CT) Porosity Permeability Geometrical information Three-dimensional medial axis(3DMA)

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Laser-assisted direct roller imprinting of large-area microstructured optical surfaces

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Microsystems & Nanoengineering 2024年第1期10卷 257-266页

作者： Keisuke Nagato Ken takahashi Yuki Yajima Masayuki Nakao Department of Mechanical Engineering Graduate School of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-8656Japan

In this study,a high-throughput fabrication method called laser-assisted direct roller imprinting(LADRI)was developed to lower the cost of nanoimprinting large-area polymer films and to address problems associated with nanoimprinting,namely,microstructural damage and precision in flatness of entire *** LADRI,the laser directly heats the microstructured surface of the roller mold,which heats and melts the surface of a polymethyl methacrylate(PMMA)film to replicate the microstructures on the mold *** this study,the effects of laser power density,scanning speed,size of the microstructures,and contact pressure on the replication speed were investigated *** replication speed increased as the power and scanning speed ***,because the film required heating until it filled the entire depth of the microstructure,an appropriate replication speed was *** result was supported by simulation of the temperature distribution inside the mold and the PMMA using transient heat conduction *** demonstrate the applications of LADRI,two different optical surfaces were replicated:an antireflection(AR)structure with conical structures sized several hundred nanometers and a lightextraction structure with a microlens array(MLA)comprising 10μm lenses,for display and illumination,*** replication degree of the MLA was governed by the contact *** flow simulation indicated that the heat conduction and flow speeds of the melted PMMA surface were comparable within several tens of *** addition,the reflectivity of the AR structure decreased from 4 to 0.5%,and the light intensity of the light-extraction structure increased by a factor of 1.47.

关键词： microstructure roller conduction

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Synthesis of Highly ordered Large Size Mesoporous Silica and Effect of Stabilization as Enzyme Supports in Organic Solvent

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Chemical Research in Chinese Universities 2002年第2期18卷 200-205页

作者： LI Bo Inagaki S Miyazaki C takahashi H Toyota Central R&D Labs. Inc.411YokomichiNagakute choAichi 4801192Japan

FSM 16, MCM 41 and SBA 15 types of hexagonal mesoporous silica with a highly ordered 2 dimensional structure were synthesized by using different silicon sources and surfactants. In the 2 dimensional silicate framework, pore size can be uniformly controlled by the combined use of the surfactants having different alkyl chain lengths and the swelling agents(triisopropyl benzene). The pore diameter of FSM 16 and MCM 41 can be expanded to be 10 nm, SBA 15 to be 15 nm. The crystal regularity was decreased with the increase of the pore diameter. In FSM 16 derived from kanemite(silicon source) and MCM 41 from water glass, their anionic characteristics on the pore wall may be stronger than those of SBA 15 derived from oligomeric tetramethoxysilane(TMOS). We have successfully used FSM 16 and MCM 41 to immobilize the enzyme having cationic residues below isoelectric point. The level of adsorption of enzymes in FSM 16 and MCM 41 was relatively high, but was low in SBA 15 support. The mechanism of enzyme to be adsorbed in mesoporous silica was suggested to be the ionic interactions. In aqueous solutions, horseradish peroxidase(HTP) was immobilized in FSM 16 with 8.9 nm mesopores and the highest loading amount(183 mg/mg FSM) was obtained, but for the FSM 16 of pore diameter 30 nm only an amount of 28 mg/mg FSM was obtained. The catalytic activity in the organic solvent was high when HRP was immobilized in FSM 16 and MCM 41, but it was low in case of SBA 15.

关键词： Mesoporous silica Surfactant Swelling agent Enzyme Activity

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Role of thermal ablation in the management of colorectal liver metastasis

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Hepatobiliary Surgery and Nutrition 2020年第1期9卷 49-58页

作者： Hideo takahashi Eren Berber Department of Surgical Oncology Roswell Park Comprehensive Cancer CenterBuffaloNYUSA Department of Endocrine Surgery Cleveland ClinicClevelandOHUSA

With a recent randomized prospective trial revealing that thermal ablative therapy as local tumor control improved overall survival (OS) in patients with unresectable colorectal cancer liver metastases (CRLM), thermal ablation continues to remain as an important treatment option in this patient population. Our aim of this article is to review the current role of the ablative therapy in the management of CRLM patients. Main indications for thermal ablation include (Ⅰ) unresectable liver lesions;(Ⅱ) in combination with hepatectomy;(Ⅲ) in patients with significant medical comorbidities or poor performance status (PS);(Ⅳ) a small (<3 cm) solitary lesion, which would otherwise necessitate a major liver resection;and (Ⅴ) patient preference. There are several approaches and modalities for ablative therapy, including open, percutaneous, and laparoscopic approaches, as well as radiofrequency ablation (RFA) and microwave ablation (MWA). Each approach and ablation modality have its own pros and cons. Percutaneous and laparoscopic approaches are preferred due to minimally invasive nature, yet laparoscopic approach has more benefits from thorough intraoperative ultrasound (US) exam as well as complete peritoneal staging with laparoscopy. Similarly, whereas high local tumor failure rate has been a major concern with RFA, MWA or microwave thermosphere ablation (MTA) have demonstrated significantly improved local tumor control due to homogenous tissue heating, ability to reach higher tissue temperatures, and less susceptible to the "heat-sink" effect. Although liver resection is the standard of care for CRLM, there have been some retrospective studies demonstrating similar oncological outcome between ablative therapy and surgical resection in very selected populations with small (<3 cm) solitary CRLM. Lastly, ablative therapy and liver resection should not be mutually exclusive, especially in the management of bilobar liver metastases. Concomitant ablative therapy with hepatectomy

关键词： Thermal ablation radiofrequency ablation (RFA) microwave ablation (MWA) colorectal cancer livermetastasis (CRLM)

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From Darkness to Light: A Student’s Journey from Illness to Her True Passion

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Chinese Medicine and Culture 2018年第1期1卷 37-39页

作者： Tiffany takahashi Augusta University GAUSA

Yin and yang are the dark-bright,polar opposites that cannot exist without each *** like Rachel Clay’s passion for Chinese language and culture wouldn’t exist if it weren’t for the pain she endured.

关键词： Illness true passion yin and yang

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Axial charges of N(1535) and N(1650) in two-flavor lattice QCD

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Chinese Physics C 2009年第12期33卷 1233-1237页

作者： Toru T. takahashi Teiji Kunihiro Yukawa Institute for Theoretical Physics Kyoto University Kyoto 606-8502 Japan Department of Physics Kyoto University Kyoto 606-8502 Japan

We show the lattice QCD results on the axial charge gAN＊-N＊ of negative parity nucleon resonances, N＊（1535） and N＊（1650）, which are key clues to the chiral structure in baryon sector. The measurements are performed with up and down dynamical quarks employing the renormalization-group improved gauge action at β=1.95 and the O（a） improved clover quark action with the hopping parameters, κ=0.1375, 0.1390 and 0.1400. In order to properly separate signals of N＊（1535） and N＊（1650）, we construct 2 × 2 correlation matrices and diagonalize them. Wraparound contributions in the correlator, which can be another source of signal contaminations, are eliminated by imposing the Dirichlet boundary condition in the temporal direction. We find that the axial charge of N＊（1535） takes small values as gAN＊N＊-O（0.1）, whereas that of N＊（1650） is about 0.5, which is found independent of quark masses and consistent with the predictions by the naive nonrelativistic quark model.

关键词： axial charge chiral symmetry negative parity nucleon

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Experimental study on the in-plane thermal conductivity of Au nanofilms

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Progress in Natural Science:Materials International 2007年第2期17卷 212-216页

作者： takahashi Koji IKUTA Tatsuya FUJII Motoo Graduate School of Engineering Kyushu UniversityFukuoka 812-8581Japan Institute for Materials Chemistry and Engineering Kyushu UniversityKasuga 816-8580Japan

The in-plane thermal conductivity of Au nanofilms with thickness of 23 nm, which are fabricated by the electron beam-physical vapor deposition method and a suspension technology, is experimentally measured at 80-300 K by a one-dimensional steady-state electrical heating method. Strong size effects are found on the measured nanofilm thermal conductivity. The Au nanofilm in-plane thermal conductivity is much less than that of the bulk material. With the increasing temperature, the nanofilm thermal conductivity increases. This is opposite to the temperature dependence of the bulk property. The Lorenz number of the Au nanofilms is about three times larger than the bulk value and decreases with the increasing temperature, which indicates the invalidity of the Wiedemann-Franz law for metallic nanofilms.

关键词： nanofilm in-plane thermal conductivity size effect Wiedemann-Franz law.

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Molecular Mechanisms Contributing to Resistance to Tyrosine Kinase-Targeted Therapy for Non-Small Cell Lung Cancer

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Clinical oncology and cancer researeh 2012年第1期9卷 18-22页

作者： Fariz Nurwidya Akiko Murakami Fumiyuki takahashi Kazuhisa takahashi Department of Respiratory Medicine Juntendo University School of Medicine

One of the most important pathways in non-small cell lung cancer(NSCLC) is the epidermal growth factor receptor(EGFR) pathway. This pathway affects several crucial processes in tumor development and progression,including tumor cell proliferation,apoptosis regulation,angiogenesis,and metastatic *** EGFR is currently being intensely *** are witnessing the development of a number of potential molecular-inhibiting treatments for application in clinical *** the last decade,the tyrosine kinase(TK) domain of the EGFR was identified in NSCLC patients,and it has responded very well with a dramatic clinical improvement to TK inhibitors such are gefitinib and ***,there were primary and/or secondary resistance to these treatments,as shown by clinical *** molecular biology studies provided some explanations for the drug resistance *** molecular mechanisms of resistance need to be *** in-depth understanding of these targeted-therapy resistance may help us explore new strategies for overcoming or reversing the resistance to these inhibitors for the future of NSCLC treatment.

关键词： carcinoma non-small-cell lung mutation drug resistance

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Fluid-induced high-temperature metasomatism at Rundv?gshetta in the Lützow-Holm Complex, East Antarctica: Implications for the role of brine during granulite formation

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Geoscience Frontiers 2018年第5期9卷 1309-1323页

作者： Kazuki takahashi Toshiaki Tsunogae Emmanuel Nwachukwu Ugwuonah Graduate School of Life and Environmental Sciences University of TsukubaIbaraki 305-8572Japan Department of Geology University of JohannesburgAuckland Park 2006South Africa Department of Geology Chukwuemeka Odumegwu Ojukwu UniversityUliNigeria

We report new petrological, phase equilibria modeling, and fluid inclusion data for pelitic and mafic granulites from Rundv?gshetta in the highest-grade region of the Neoproterozoic Lützow-Holm Complex(LHC),East Antarctica, and provide unequivocal evidence for fluid-rock interaction and high-temperature metasomatism in the presence of brine fluid. The studied locality is composed dominantly of well-foliated pelitic granulite(K-feldspar+quartz+sillimanite+garnet+ilmenite) with foliation-parallel bands and/or layers of mafic granulite(plagioclase+orthopyroxene+garnet+ilmenite+quartz+biotite). The boundary between the two lithologies is defined by thin(about 1 -20 cm in thick) garnet-rich layers with a common mineral assemblage of garnet+plagioclase+quartz+ilmenite+biotite ? orthopyroxene. Systematic increase of grossular and decrease of pyrope contents in garnet as well as decreasing Mg/(Fe+Mg) ratio of biotite from the pelitic granulite to garnet-rich rock and mafic granulite suggest that the garnet-rich layer was formed by metasomatic interaction between the two granulite lithologies. Phase equilibria modeling in the system NCKFMASHTO demonstrates that the metasomatism took place at 850 -860℃, which is slightly lower than the peak metamorphism of this region, and the modal abundance of garnet is the highest along the metapeliteemetabasite boundary(up to 40%), which is consistent with the field and thin section observations. The occurrence of brine(7.0 -10.9 wt.% Na Cleqfor ice melting or 25.1 -25.5 wt.% NaC leqfor hydrohalite melting) fluid inclusions as a primary phase trapped within plagioclase in the garnet-rich layer and the occurrence of Cl-rich biotite(Cl = 0.22 -0.60 wt.%) in the metasomatic rock compared to that in pelitic(0.15 -0.24 wt.%) and mafic(0.06-0.13 wt.%) granulites suggest infiltration of brine fluid could have given rise to the high-temperature metasomatism. The fluid might have been derived from external sources possibly related to the formation

关键词： High-temperature metasomatism Brine Phase equilibrium modeling Fluid inclusion Gondwana Lützow-Holm Complex

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