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Plasma Science and Technology 2018年第8期20卷 50-57页

作者： Shuichi SATO Hiromu KAWANA Tatsushi FUJIMINE Mikio OHUCHI Department of Electronic Engineering Tokyo Denki University

We measured electron temperatures through a hollow cathode-type discharge tube using several different floating probe methods. This method detected a shift in the floating potential when an AC voltage was applied to a probe through an intermediary blocking capacitor. The shift in the floating potential is described as a function of the electron temperature and the applied AC voltage. In this study, the effects of the frequency and waveform on the electron temperatures were systematically investigated. The electron temperature measured when using the floating probe method with applied sinusoidal and triangular voltages was lower than that measured with an applied rectangular *** value in the high frequency range was close to that of the tail electron temperature.

关键词： electrostatic probe Langmuir probe floating potential electron temperature sheath

Electron Temperature Measurement by Floating Probe Method Using AC Voltage

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Plasma Science and Technology 2016年第11期18卷 1089-1094页

作者： Satoshi NODOMI Shuichi SATO Mikio OHUCHI Department of Electrical and Electronic Engineering Tokyo Denki University

This study presents a novel floating probe method to measure electron temperatures using a hollow cathode-type discharge tube. The proposed method detects a shift in the floating potential when an AC voltage is applied to a probe through an intermediary blocking capacitor. The shift in the floating potential is described as a function of the electron temperature and the applied AC voltage. The floating probe method is simpler than the Langmuir probe method because it does not require the measurement of volt-ampere characteristics. As the input AC voltage increases, the electron temperature converges. The electron temperature measured using the floating probe method with an applied sinusoidal voltage shows a value close to the first （tail） electron temperature in the range of the floating potential.

关键词： electrostatic probe Langmuir probe floating potential electron temperature sheath

Trajectory control of pneumatic servo table with air bearing

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Trajectory control of pneumatic servo table with air bearing

NUMERICAL AND EXPERIMENTAL STUDY OF LURE MOVING IN WATER

2011 International Conference on Fluid Power and Mechatronics

作者： Kenji Kawashima Toshiharu Kagawa Toshinori Fujita Mechano-Micro Engineering Department tokyo Institute of Technology Nagatsuta-cho Midori-kuYokohamaKanagawaJapan tokyo denki university kanda-nishiki-cho Chiyoda-kuTokyo 101-8457Japan

In this paper,the trajectory control design of the pneumatic servo table considering the dynamics of pipelines and servo valve is *** table is mainly composed by a pneumatic actuator,the high-performance pneumatic servo valve and *** pneumatic actuator utilizes a pneumatic cylinder with air *** servo valve,with high dynamics up to 300Hz,is connected with the pneumatic actuator by *** whole system is pneumatically driven,it has advantages like low heat generation and non-magnetic,which are suitable for precise positioning.A linear model considering the dynamics of pipelines and the servo valve is designed to simulate the *** with experimental results,it is found that with 7th order linear control model,the discrepancy between experimental and simulation results became much smaller than the 3rd order model was ***,a low dimensional model is necessary for practical *** there are two poles which are much further from imaginary axis compared with other five poles in the pole loci of the 7th order model,the model’s order can be reduced into *** comparing simulation with experimental results,we found that the 5th order model can also match with the real system *** on this result,a 5th order feed forward has been *** a curve which can derivate by five times is inputted,the experimental results show that the maximum trajectory has been minimized by 20μm.

关键词： Pneumatics Trajectory control Linear model Pneumatic servo table

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Transactions of Nanjing university of Aeronautics and Astronautics 2013年第3期30卷 257-259页

作者： Wataru Sekiguchi Naoya Takahashi Shigeho Noda Ryutaro Himeno Graduate School of Engineering Tokyo Denki University Department of Engineering Tokyo Denki University Advanced Center for Computing and Communication

The motion of a lure in water is investigated experimentally and *** lure motion in water of apassing water tank is observed,and the periodic motion is *** the Fourier analysis,it is found that the frequency with the largest amplitude in the lateral direction depends on the lip width of the *** understand the lure dynamics,a numerical simulation of the flow field around the lure is *** shape is measured using an X-ray computer tomography and converted into a voxel *** visualization,it is found that vortex sheds from its lip correspond to the vibration frequency of the lure.

关键词： fishing lure passing water channel voxel model X-ray computer tomography computational fluid dynamics(CFD)

Chaotic Dynamics of a Simple Excitable Neuron Model

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Chaotic Dynamics of a Simple Excitable Neuron Model

SIMULTANEOUS FLOW VISUALIZATION AND WALL-PRESSURE MEASUR EMENT OF THE TURBULENT SEPARATED AND REATTACHING FLOW OVER A BACKWARD-FACING STEP

IJCNN International Joint Conference on Neural Networks

作者： N.Ichinose K.Aihara K.Judd Department of Electronic Engineering Factdty of EngineeringTokyo Denki University2-2 Nishiki-chokandaChiyoda-kuTokyo 101Japan Department of Mathematics University of Western Australia.

＜正＞We study a neuron model with asynchronous excitable dynamics in this paper. This model is called the Z-model and described by a simple difference equation. We numerically analyze its response characteristics to ...

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Journal of Hydrodynamics 2007年第2期19卷 180-187页

作者： KE Feng LIU Ying-zheng CHEN Han-ping HIDE S.Koyama School of MechaniCal andPower Engineering Shanghai Jiaotong University Shanghai 200030 China Department of Mechanical Engineering Tokyo Denki University Tokyo Japan

Unsteady behaviors of the large-scale vortical structure superimposed in the turbulent separated and reattaching flow over a backward-facing step were convincingly delineated by performing simultaneous measurements of the wall pressure fluctuations and visualizations of the flow. Toward this end, a synchronized instrumentation system integrated with the microphone array and the high-speed camera was established. The smoke-wire technique was employed to visualize the unsteady events. A thorough analysis based on the wall pressure fluctuations disclosed that the large-scale vortical structure shedding at the frequency of fH/Uo = 0.064 gave a primary contribution to the wall pressure fluctuations, and consequently dominated unsteady behaviors of the turbulent shear layer. The convection velocity of the large-scale vortical structure was determined as Uc =0.55 U0. The instantaneous flow visualizations and wall pressure were compared in a straightforward manner. Below the separation bubble and the reattachment zone, the negative peak of the time-varying wall pressure was in phase with passage of the local large-scale vortical structure. In the redeveloping turbulent boundary layer, the decaying large-scale vortical structure was clearly revealed.

关键词： backward-facing step large-scale vorticalstructure visualization wall pressure fluctuations

JOINT INVESTIGATION OF ROTATING FLOW WITH VORTEX BREAKDOWN USING CFD, VISUALIZATION AND LDV

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Journal of Hydrodynamics 2005年第4期17卷 455-458页

作者： LIU Ying-zheng CHEN Han-ping KOYAMA Hide S. School of Mechanical and Power Engineering Shanghai Jiaotong University Shanghai 200030 China Department of Mechanical Engineering Tokyo Denki University Tokyo Japan

Vortex breakdown of the steady axisymmetic rotating flow in a confined cylindrical container with a rotating endwall was numerically and experimentally studied. High-quality precision-controlled turntable facilities were established at Shanghai Jiaotong university and tokyo denki university independently. Collaborative investigations of vortex breakdown were carried out using CFD, Laser Doppler Velocimetry （LDV） and streakline visualization, respectively. The characteristics of vortex breakdown were delineated in terms of comparative investigation using numerical and experimental results. SIMPLEC scheme and FMG multigrid was applied to numerical simulation. Numerical simulation was extensively compared with streakline visualization and LDV measurements, showing qualitative and quantitative agreements.

关键词： vortex breakdown CFD visualization Laser Doppler Velocimetry (LDV)

NUMERICAL EVALUATION OF TWO-FLUID MIXING IN A SWIRL MICRO-MIXER

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Journal of Hydrodynamics 2006年第5期18卷 542-546页

作者： JIN Si-yu LIU Ying-zheng WANG Wei-zhe CAO Zhao-min KOYAMA Hide S. School of Mechanical and Power Engineering Shanghai Jiaotong University Shanghai 200030 China Department of Mechanical Engineering Tokyo Denki University Tokyo Japan

A collaborative investigation of two-fluid mixing in a swirl micro-mixer was carried out by the Shanghai Jiao Tong university and the tokyo denki university. Pure water and a mixture of glycerol and water were separately injected into branch channels and they were subsequently mixed in the central chamber. The two-fluid flow pattern was numerically modeled, in which the dependence of the mixture viscosity and density on the mass fraction of glycerol in the mixing fluid was carefully taken into consideration. The mixing performance of the two fluids was evaluated by varying the Reynolds numbers and the mass fractions of glycerol in water. The mixing process was extensively analyzed using streamline maps and contour plotting distributions of pressure and glycerol concentration. The numerical results show that the acceptable uniformity of mixing at Re = 0.1 is primarily attributed to the time-consuming molecular diffusion, whereas the cost-effective mixing at Re 〉 500 was obtained because of the generation of the swirling flow. The increasing mass fraction of glycerol in water was found to attenuate the mixing performance. The preliminary microscopic visualization of the two-fluid mixing at Re=1300 demonstrated the consistence with the numerical results.

关键词： two-fluid mixing micro-mixer numerical simulation

Improving symbolic data visualization for pattern recognition and knowledge discovery

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Visual Informatics 2020年第1期4卷 23-31页

作者： Kadri Umbleja Manabu Ichino Hiroyuki Yaguchi School of Science and Engineering Tokyo Denki UniversityHatoyamaSaitama 350-0394Japan

This paper examines the visualization of symbolic data and considers the challenges rising from its complex *** data is usually aggregated from large data sets and used to hide entry specific details and to transform huge amounts of data(like big data)into analyzable *** is also used to offer an overview in places where general trends are more important than individual *** data comes in many forms like intervals,histograms,categories and modal multi-valued *** data can also be considered as a ***,the de facto visualization approach for symbolic data is zoomstars which has many *** biggest limitation is that the default distributions(histograms)are not supported in 2D as additional dimension is *** paper proposes several new improvements for zoomstars which would enable it to visualize histograms in 2D by using a quantile or an equivalent interval *** addition,several improvements for categorical and modal variables are proposed for a clearer indication of presented *** for different approaches to zoomstars are offered depending on the data type and the desired ***,an alternative approach that allows visualizing the whole data set in comprehensive table-like graph,called shape encoding,is *** visualizations and their usefulness are verified with three symbolic data sets in exploratory data mining phase to identify trends,similar objects and important features,detecting outliers and discrepancies in the data.

关键词： Data visualization Symbolic data Zoomstar Shape encoding Exploratory data analysis

An Analysis of Chaotic Neurodynamics by Deterministic Nonlinear Prediction

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An Analysis of Chaotic Neurodynamics by Deterministic Nonlin...