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Optical Nonlinearity in a Novel Optical Signal Regeneration System Based on Cross-Gain Modulation Using Cascaded Semiconductor Optical Amplifiers

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光学学报 2003年第S1期23卷 544-545页

作者： hidekazu Takeda Hiroyuki Uenohara Microsystem Research Center P&I Lab. Tokyo Tech. 4259 Nagatsuta Midori-ku Yokohama 226-8503 JapanMicrosystem Research Center P&I Lab. Tokyo Tech. 4259 Nagatsuta Midori-ku Yokohama 226-8503 Japan

We propose a novel optical signal regeneration system based on wavelength converters by use of cross gain modulation in cascaded semiconductor optical amplifiers. The nonlinearity in optical input/output characteristi... 详细信息

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An optimal management strategy for stochastic population dynamics of released Plecoglossus altivelis in rivers

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International Journal of Modeling, Simulation, and Scientific Computing 2017年第2期8卷 204-219页

作者： Yuta Yaegashi hidekazu Yoshioka Koichi Unami Masayuki Fujihara Graduate School of Agriculture Kyoto University Kitashirakawa Oiwake-choSakyo-kuKyoto City Kyoto Prefecture606-8502Japan Faculty of Life and Environmental Science Shimane University Nishikawatsu-cho 1060 Matsue CityShimane Prefecture690-8504Japan Graduate School of Agriculture Kyoto UniversityKitashirakawa Oiwake-cho Sakyo-kuKyoto CityKyoto Prefecture606-8502Japan

Excessive predation pressure from the waterfowl Phalacrocorax carbo(Great Cormorant)on Plecoglossus altivelis(Ayu)has recently been a severe problem of river environment in *** fishery cooperatives are currently suffering from economic difficulties due to decrease of the fish catch of *** fishery cooperatives and municipalities have been enthusiastically trying to develop countermeasures that can effectively reduce the predation pressure;however,their effectiveness and efficiency have not been systematically quantified *** aim can be achieved with the help of an appropriate mathematical *** this paper,based on a pure death process,a practical stochastic control model for population dynamics of released *** in river environment under predation pressure from ***,harvesting by human,and environmental fluctuations is *** an optimal management strategy ultimately reduces to solving a 2D Hamilton–Jacobi–Bellman equation,which is performed with a finite element *** application to a Japanese river environment successfully computes the optimal management strategy that is consistent with the *** sensitivity analysis of the presented mathematical model is also performed for comprehension of dependence of the optimal strategy on the model parameters.

关键词： Optimal fishery resources management inland fishery resources waterfowl Hamilton-Jacobi-Bellman equation finite element approximation.

One-step phenol production from a water–toluene mixture using radio frequency in-liquid plasma

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Plasma Science and Technology 2017年第5期19卷 60-67页

作者： Muhammad AGUNG Shinfuku NOMURA Shinobu MUKASA Hiromichi TOYOTA Otsuka KAZUHIKO hidekazu GOTO Graduate School of Science and Engineering Ehime University Matsuyama 790-8577 Japan Faculty of Engineering Makassar State University Makassar 90-222 Indonesia Graduate School of Engineering Osaka University Suita 565-0871 Japan Author to whom any correspondence should be addressed.

The objectives of this research were to understand the process of converting toluene into phenol in a one-step process directly from a water–toluene mixture using the plasma in-liquid *** were conducted using 27.12 MHz radio frequency（RF） in-liquid plasma to decompose a solution of 30% toluene. Based on the experimental results as evaluated using gas chromatography–mass spectrometry（GC–MS）, along with additional analysis by the Gaussian calculation, density functional theory（DFT） hybrid exchange–correlational functional（B3LYP）and 6-311 G basis, the phenol generated from toluene was quantified including any *** the experiment, it was found that OH radicals from water molecules produced using RF inliquid plasma play a significant role in the chemical reaction with toluene. The experimental results suggest that phenol can be directly produced from a water–toluene mixture. The maximum phenol yields were 0.0013% and 0.0038% for irradiation times of 30s and 60s,respectively, at 120 W.

关键词： phenol toluene radio frequency in-liquid plasma Gaussian calculation

Azacitidine decreases reactive oxygen species production in peripheral white blood cells:A case report

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World Journal of Clinical Cases 2020年第22期8卷 5657-5662页

作者： hidekazu Hasunuma Naomi Shimizu Hiromitsu Yokota Ichiro Tatsuno Department of Blood Transfusion Toho University Medical Center Sakura HospitalSakura 2858741Japan Department of Hematology Toho University Medical Center Sakura HospitalSakura 2858741Japan Clinical Laboratory Program Education Development CenterFaculty of Science Toho UniversityFunabashi 2748510Japan Center for Diabetes Metabolism and EndocrinologyToho University Medical Center Sakura HospitalSakura 2858741Japan

BACKGROUND In myelodysplastic syndrome(MDS),oxidative stress is closely related to iron overload and DNA damage.A recent study suggested the possibility that increased oxidative stress causes not only iron overload but also disease progression of MDS with DNA *** present a case of MDS with decreased reactive oxygen species(ROS)production in peripheral white blood cells(WBCs)and decreased diacron-reactive oxygen metabolites(d-ROMs)in serum after azacitidine *** SUMMARY A 74-year-old man presented to the hematological department with the chief complaint of *** vital signs were within normal limits at admission with a heart rate of 80 bpm and blood pressure of 135/60 *** tests indicated pancytopenia,a WBC count of 2190 cells/μL,a hemoglobin level of 6.2 g/dL and a platelet count of 7.4×104/μ*** patient was diagnosed with MDS with fibrosis after a bone marrow *** case showed decreased ROS production in WBCs,d-ROMs in serum and Wilms’tumor 1 after azacitidine therapy,after which his hematopoiesis *** Azacitidine therapy can improve hematopoiesis and decrease ROS and d-ROM production.

关键词： Myelodysplastic syndrome Reactive oxygen species Diacron-reactive oxygen metabolites Ferritin Azacitidine Case report

Analyzing gaze behavior for text-embellished narrative visualizations under different task scenarios

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Visual Informatics 2020年第3期4卷 41-50页

作者： Chris Bryan Aditi Mishra hidekazu Shidara Kwan-Liu Ma School of Computing Informaticsand Decision Systems EngineeringArizona State UniversityUnited States Department of Computer Science University of CaliforniaDavisUnited States

We conduct an eye tracking study to investigate perception text-embellished narrative visualizations under different task *** stimuli are data visualizations embellished with text-based elements:annotations,captions,labels,and descriptive *** consider three common viewing tasks that occur when these types of graphics are viewed:(1)simple observation,(2)active search to answer a query,and(3)information memorization for later *** overarching goal is to understand,at a perceptual level,if and how task affects how these visualizations are interacted *** analyzing collected gaze data and conducting advanced semantic scanpath analysis,we find,at a high level,diverse patterns of gaze behavior:simple observation and information memorization lead to similar optical viewing strategies,while active search significantly diverges,both in regards to which areas of the visualization are focused upon and how often embellishments are interacted *** discuss study outcomes in the context of embellishing visualizations with text for various usage scenarios.

关键词： Eye tracking Perception User study

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铝合金薄板固有变形逆解析方法的研究与开发

中国有色金属学报 2015年第11期25卷 3011-3018页

作者：梁伟邓德安 MURAKAWA hidekazu 重庆交通大学机电与汽车工程学院重庆400074 哈尔滨工业大学先进焊接与连接国家重点实验室哈尔滨100051 重庆大学材料科学与工程学院重庆400044 Joining and Welding Research Institute Osaka University

为了获得可靠的铝合金焊接接头上固有变形,开发一种将实验与基于固有应变的有限元法(FEM)融为一体的新方法来获得接头的固有变形。为了澄清铝合金薄板焊接固有变形的分布特征,先采用热-弹-塑性有限元计算铝合金TIG重熔接头的焊接变形,... 详细信息

为了获得可靠的铝合金焊接接头上固有变形,开发一种将实验与基于固有应变的有限元法(FEM)融为一体的新方法来获得接头的固有变形。为了澄清铝合金薄板焊接固有变形的分布特征,先采用热-弹-塑性有限元计算铝合金TIG重熔接头的焊接变形,并建立固有变形在接头上的简化分布模型。其次,以该模型为基础,提出一种通过测量焊接接头上少数位置上焊前和焊后三维坐标来逆向求解固有变形的计算方法。最后,将利用该算法获得的铝合金薄板接头固有变形代入到基于固有应变理论的弹性有限元分析中,计算得到的焊接变形能较好地再现热-弹-塑性有限元方法计算得到的结果和实验结果。结果表明:采用提出的逆解析方法来获得铝合金接头的固有变形是有效可行的。

关键词：铝合金逆解析方法固有应变法热-弹-塑性有限元法薄板

Effects of a Perimeter on the Post-failure Behavior of Fiber-reinforced Polymer Composite Lattices

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第2期2卷 19-24页

作者： Naruki Ichihara Masahito Ueda Akira todoroki Department of Mechanical Engineering College of Science and TechnologyNihon UniversityTokyo101-8308Japan Department of Mechanical Engineering Tokyo Institute of TechnologyTokyo152-8550Japan

The post-failure behavior of a fiber-reinforced polymer composite lattice was experimentally studied using a beam *** topology optimization was conducted to maximize the structural stiffness and partial latticing to improve ***,an infill structure was generated from the optimized results using a phase field *** perimeter of the two-dimensional beam structure was generated from a binary solution of the optimized *** composite lattice structures were obtained using three-dimensional ***-point bending tests demonstrated that the perimeter enhanced the toughness of the composite *** perimeter prevented shear band failure and improved the load-carrying capability,even after maximum loading.

关键词： Additive manufacturing Polymer-matrix composites Topology optimization Toughness

Synthesis of core-shell structured Au@Bi2S3 nanorod and its application as DNA immobilization matrix for electrochemical biosensor construction

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Chinese Chemical Letters 2020年第1期31卷 181-184页

作者： Feng Gao Juan Song Bin Zhang hidekazu Tanaka Fei Gao Weiwei Qiu Qingxiang Wang Department of Chemistry and Environment Science Minnan Normal UniversityZhangzhou 363000China Department of Chemistry Graduate School of Science and EngineeringShimane UniversityMatsueShimane 690-8504Japan Key Laboratory of Sensor Analysis of Tumor Marker Ministry of Education College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China

The core-shell structured Au@Bi2S3 nanorods have been prepared through direct in-situ growth of Bi2S3 at the surface of pre-synthesized gold *** product was characterized by X-ray diffraction,transmission electron microscopy and energy-dispersive X-ray *** the obtained Au@Bi2S3 nanorods were coated onto glassy carbon electrode to act as a scaffold for fabrication of electrochemical DNA biosensor on the basis of the coordination of-NH2 modified on 5’-end of probe DNA and Au@*** characterization assays demonstrate that the Au@Bi2S3 nanorods behave as an excellent electronic transport channel to promote the electron transfer kinetics and increase the effective surface area by their nanosize *** hybridization experiments reveal that the Au@Bi2S3 matrix-based DNA biosensor is capable of recognizing complementary DNA over a wide concentration ranging from 10 fmol/L to 1 nmol/*** limit of detection was estimated to be 2 fmol/L(S/N=3).The biosensor also presents remarkable selectivity to distinguish fully complementa ry sequences from basemismatched and non-complementary ones,showing great promising in practical application.

关键词： DNA biosensor Au@Bi2S3 nanorods Electrochemical impedance spectroscopy Core-shell structure Bi^3+-N bond Probe immobilization

Sedimentary processes in Zenisu deep-sea channel revealed by side-scan imagery

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Chinese Journal of Oceanology and Limnology 2005年第4期23卷 368-375页

作者：吴时国郭军华 TOKUYAMA hidekazu Institute of Oceanology Chinese Academy of SciencesQingdao 266071 China Institute of Oceanology Chinese Academy of SciencesQingdao 266071 China Graduate School of the Chinese Academy of SciencesBeijing 100049 China Ocean Research Institute University of Tokyo Tokyo 2370061 Japan

Side-scan sonar data collected by Cruises 99-09 Leg 2 and 00-06 Leg l of R/V Yokosuka were used to reveal the sedimentary processes in Zenisu deep-sea channel. The middle and lower segments of the channel are rich in turbidite and other debrite deposits. By high-resolution imaging, three sedimentary processes were distinguished with distinct acoustic features. 1. Slumps and slides occur with contrasting backscatter, rough surface textures, blockings, and acoustic shadows at headwalls. They are very extensive and often in lobate form downslope. 2. Debris flow has uniform, general medium backscatter, sometimes showing marbling/lineation in lobate form. 3. Turbidity current is characterized by low backscatter confined to the channel as acoustic signal is attenuated. Regional tectonics must be the dominating factor that controls deposition pattern in this area.

关键词： side-scan sonar image sedimentary processes deep-sea channel Nankai Trough