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Tribology property in oil-impregnated porous carbon materials made from rice hull

International Journal of the Society of Material engineering for Resources 2018年第1期23卷 59-63页

作者： Honma, Kento Masuyama, Tomoya Takahashi, Takeshi Iizuka, Hiroshi Shishido, Michiaki Dept. of Mechanical and Control Engineering National Institute of Technology Tsuruoka College 104 Sawada-Inooka Tsuruoka Yamagata997-8511 Japan Department of Creative Engineering National Institute of Technology Tsuruoka College Japan Sanwa Yushi Co. Ltd Tendo994-0044 Japan Department of Mechanical System Engineering Faculty of Engineering Yamagata University 4-3-16 Jonan Yonezawa Yamagata992-8510 Japan

Rice hull, which is one of the agricultural waste in Japan, has been required for reuse from the viewpoint of environment protection. Rice hull has the porous structure that originates from plants. Rice hull silica carbon (RHSC) material is manufactured by mixing and impregnating the rice hull with a phenol resin, and then carbonizing it in a nitrogen gas atmosphere at high temperatures. RHSC has core competencies such as low friction coefficient and water resistance, and it is expected to be applied to linear guide elements and sliding bearing. Moreover, an improvement in friction property is expected by keeping the lubricating oil in the natural porous structure. In this study, the friction and wear mechanisms of RHSC are discussed from the tribology properties obtained by block-on-ring test and the worn surfaces observed with a laser microscope. © 2018 Society of Materials engineering for Resources of Japan. All rights reserved.

关键词： Carbon

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Current-limiting droop controller with fault-ride-through capability for grid-tied inverters

Current-limiting droop controller with fault-ride-through ca...

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IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe)

作者： A. G. Paspatis G. C. Konstantopoulos M. Mayfield V. C. Nikolaidis Dept. Automatic Control and Systems Engineering The University of Sheffield Sheffield UK Dept. Civil and Structural Engineering The University of Sheffield Sheffield UK Dept. Electrical and Computer Engineering Democritus University of Thrace Xanthi Greece

In this paper, the recently proposed current-limiting droop (CLD) controller for grid-connected inverters is enhanced in order to comply with the Fault-Ride-Through (FRT) requirements set by the Grid Code under grid voltage sags. The proposed version of the CLD extends the operation of the original CLD by fully utilizing the power capacity of the inverter under grid faults. It is analytically proven that during a grid fault, the inverter current increases but never violates a given maximum value. Based on this property, an FRT algorithm is proposed and embedded into the proposed control design to support the voltage of the grid. In contrast to the existing FRT algorithms that change the desired values of both the real and reactive power, the proposed method maximizes only the reactive power to support the grid voltage and the real power automatically drops due to the inherent current-limiting property. Extensive simulations are presented to compare the proposed control approach with the original CLD under a faulty grid.

关键词： Inverters Circuit faults Reactive power Voltage control Power quality Guidelines control design

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A new object recognition framework based on PCA, LDA, and K-NN 11

A new object recognition framework based on PCA, LDA, and K-...

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11th International Conference on Computer engineering and systems, ICCES 2016

作者： Hagar, Asmaa A.M. Alshewimy, Mahmoud A.M. Saidahmed, Mohamed T. Faheem Computers and Automatic Control Dept. Faculty of Engineering Tanta University Egypt

ISBN: (纸本)9781509032679

In this paper, a new object recognition framework is presented. The framework includes a variety of object recognition approaches based on Principal Component Analysis (PCA), Linear Discriminant Analysis (LDA), and the K-nearest neighbor (K-NN). A color image vector representation model is also introduced. Based on the representation model, color Eigenspace is constructed using PCA and LDA for feature extraction. The K-NN is adopted as a mechanism for classification. The object recognition framework approaches were tested on Columbia Object Image Library (COIL-100) and Amsterdam Library of Object Images (ALOI) color object databases. Experimental results on these databases evinced the effectiveness of the proposed work with high recognition rates in comparison with the results of previous works in the literature. The recognition rate has reached in some cases 100%. © 2016 IEEE.

关键词： Feature extraction

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Co-operative Estimation for Source Localisation using Binary Sensors

Co-operative Estimation for Source Localisation using Binary...

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IEEE Annual Conference on Decision and control

作者： Daniel D. Selvaratnam Iman Shames Dimos V. Dimarogonas Jonathan H. Manton Branko Ristic Dept. Electrical and Electronic Engineering University of Melbourne Automatic Control School of Electrical Engineering KTH Royal Institute of Technology. Electronics and Telecommunications Engineering RMIT University

This paper considers the problem of localising a signal source using a team of mobile agents that can only detect the presence or absence of the signal. A background false detection rate and missed detection probability are incorporated into the assumptions. An estimation algorithm is proposed that discretizes the search environment into cells, and uses Bayesian techniques to approximate the posterior probability of each cell containing the source. Analytical results are presented for a range of specific cases, and simulations are used to investigate more complex scenarios.

关键词： Estimation Convergence Bayes methods Indexes Sensors Atmospheric measurements Monte Carlo methods

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USMED and Surgery Assist: IMAGO MOL Cluster Biomedical Solutions to Improve Patient Imaging Availability and Noninvasive Diagnosis

USMED and Surgery Assist: IMAGO MOL Cluster Biomedical Solut...

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E-Health and Bioengineering Conference (EHB)

作者： Vlad Ghizdovat Lucian Nita Paul Herghelegiu Simona Caraiman Alina Capitanu Carmeni Mihai Cati Stolniceanu Jalloul Wael Delia Ciobanu Lidia Ionescu Irena-Cristina Grierosu Cipriana Stefanescu Biophysics Dept. “Grigore T. Popa” University of Medicine and Pharmacy Iaşi Romania SC ROMSOFT SRL Iasi Romania Faculty of Automatic Control and Computer Engineering “Gheorghe Asachi” Technical University of Iasi Iasi Romania North East RDA Piatra Neamt Romania Imago-Mol Cluster Iaşi Romania “Sf. Spiridon” Emergency County Hospital Nuclear Medicine Laboratory Iasi Romania Department of Pathology “Grigore T. Popa” University of Medicine and Pharmacy Iaşi Romania 3rd Surgery Department “Sf. Spiridon” Emergency County Hospital Iasi Romania Imago Mol Cluster “Grigore T. Popa” University of Medicine and Pharmacy Iaşi Romania

For patient well-being and also for cost efficiency, constantly improving the medical act is essential. All patients undergo a set of medical tests before going into surgery. In some cases, these tests have to be repeated in different hospitals due to the lack of a system that facilitates presenting and sharing patient's data. We present two e-Health solutions for hospitals and clinics in the medical data field. Our aim was to design and implement a unique system for medical data management. This system allows easy data transfer between medical facilities. It also improves the medical diagnostic and treatment process and it increases the quality of medical care. Also, it improves the communication between patients and physicians, decreases the duration and costs of hospitalization and improves the patient's quality of life. The second medical solution presented in this paper present the results of the medical tests directly to a screen in the operating room, further reducing the time a patient has to wait before going into surgery and also improving the medical act. Both medical solutions were tested in real-world scenarios with promising results.

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Smart meter privacy via the trapdoor channel

arXiv

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arXiv 2017年

作者： Arrieta, Miguel Esnaola, Iñaki Dept. of Automatic Control and Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom Dept. of Electrical Engineering Princeton University PrincetonNJ08544 United States

A battery charging policy that provides privacy guarantees for smart meter systems with finite capacity battery is proposed. For this policy an upper bound on the information leakage rate is provided. The upper bound applies for general random processes modelling the energy consumption of the user. It is shown that the average energy consumption of the user determines the information leakage rate to the utility provider. The upper bound is shown to be tight by deriving the probability law of a random process achieving the bound. Copyright © 2017, The Authors. All rights reserved.

关键词： Smart meters

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Test wrapper algorithm for scan chain balance based on entropy increase hybrid differential evolution

Test wrapper algorithm for scan chain balance based on entro...

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International Conference on Electronic Measurement and Instruments, ICEMI

作者： Deng Libao Zhang Baoquan Wang Sha Qiao Liyan School of Information and Electrical Engineering Harbin Institute of Technology at Weihai Weihai China Dept. of Automatic Test and Control Harbin Institute of Technology Harbin China

A well cores reused-based wrapper design is an important approach to minimize SOC test application time and test costs. The combinatorial optimization problem of core wrapper design has been proven to be a NP-hard problem. In this paper, a wrapper scan chain balance algorithm with entropy increase hybrid discrete differential evolution (EIHDE) is proposed to solve the core wrapper problem, which is inspired by thermodynamic system principle of entropy increase and outstanding global searching ability of Differential Evolution (DE). The proposed approach develops a cooperative mutation strategy based on entropy increase for the problem to preserving its interesting search mechanism for discrete domains. In the proposed model, two cooperative encode modes of individuals are introduced for standard differential mutation and the cooperative entropy increase mutation: integer encode mode and binary encode mode. EIHDE controls the search space by differential mutation, and search for superior individual in local space by entropy increase mutation. The combination of two kinds of mutation operations promotes the optimization ability considerably and achieves a better tradeoff between exploitation and exploration. The experimental results of the ITC'02 SOC test benchmarks show that EIHDE can achieve more balanced results compared with other algorithms.

关键词： IP networks Algorithm design and analysis Entropy Optimization Sociology Statistics Binary codes

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A serial structure for digital microfluidic biochips online testing

A serial structure for digital microfluidic biochips online ...

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International Conference on Electronic Measurement and Instruments, ICEMI

作者： Deng Libao Sun Ning Ren Tao Fu Ning School of Information and Electrical Engineering Harbin Institute of Technology at Weihai Weihai China Dept. of Automatic Test and Control Harbin Institute of Technology Harbin China

Digital microfluidic biochips are revolutionizing the field of biochemistry experiment. Due to the rapidity and accuracy acquirement of the operation in its applications, the comprehensive online testing is necessary in order to enhance the reliability of the system. However, the existing testing methods which focus on the quality of droplets have the disadvantages of consuming a lot of time and resources, and the re-executed operations cannot be performed in pin-constrained biochips, leading to the expansion of chip scale and the increase of fabricating costs. This paper proposes an optimal structure design for testability, targeting for the real-time voltage sequences of electrode array as the feedback signals for online testing. By integrating shift register circuits into the original chip, the scheme can transmit feedback data to the microcontroller serially through minimum number of control pins to dynamically reconfigure the biochip. Furthermore, we propose a heuristic approach for large scale electrode array, further enhancing the efficiency of online testing. Experiments validate the effectiveness of the proposed scheme by real-life biochemical applications.

关键词： Electrodes Testing Clocks Microfluidics Shift registers Pins Sensors

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Synchronized Cell-Balancing Charging of Supercapacitors

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IFAC-PapersOnLine 2017年第1期50卷 3338-3343页

作者： Li H. Peng J. He J. Huang Z. Pan J. School of Information Science and Engineering Central South University Changsha 410087 China Department of Computer Science University of Victoria Victoria V8P5C2 Canada Dept. of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Shanghai 200240 China

As a classical cell balancing solution in low-power supercapacitor applications, the switched resistor circuit is vulnerable to resistance deviation effects with existing cell balancing methods. In this paper, we propose a synchronized cell balancing method for switched resistor circuits based on the consensus theory and a cyber-physical approach, with the aim of synchronizing cell voltages before they are fully charged. It is shown that the proposed cell-balancing algorithm is robust to resistance deviation effects. Extensive simulations are provided to show the effectiveness of the proposed method. © 2017

关键词： Cell balancing Charging Consensus Cyber-physical systems Supercapacitors

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Evolving pulsation of the slowly rotating magnetic β Cep star ξ1 CMa

arXiv

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arXiv 2019年

作者： Wade, G.A. Pigulski, A. Begy, S. Shultz, M. Handler, G. Sikora, J. Neilson, H. Cugier, H. Erba, C. Moffat, A.F.J. Pablo, B. Popowicz, A. Weiss, W. Zwintz, K. Dept. of Physics & Space Science Royal Military College of Canada PO Box 17000 Station Forces KingstonONK7K 0C6 Canada Instytut Astronomiczny Uniwersytet Wroclawski Kopernika 11 Wroclaw51-622 Poland Dept. of Physics and Astronomy University of Delaware 217 Sharp Lab NewarkDE19716 United States Nicolaus Copernicus Astronomical Center Bartycka 18 Warszawa00-716 Poland Dept. of Physics Engineering Physics and Astronomy Queen's University 99 University Avenue KingstonONK7L 3N6 Canada Dept. of Astronomy & Astrophysics University of Toronto 50 St. George Street TorontoONM5S 3H4 Canada Université de Montréal C.P. 6128 Succ. Centre-Ville MontréalQCH3C 3J7 Canada American Association of Variable Star Observers 49 Bay State Road CambridgeMA02138 United States Silesian University of Technology Institute of Automatic Control Akademicka 16 Gliwice Poland Institut für Astrophysik Universität Wien Türkenschanzstrasse 17 WienA-1180 Austria Institut für Astro- und Teilchenphysik Universität Innsbruck Technikerstrasse 25/8 InnsbruckA-6020 Austria

Recent BRITE-Constellation space photometry of the slowly rotating, magnetic β Cep pulsator ξ1 CMa permits a new analysis of its pulsation properties. Analysis of the two-colour BRITE data reveals the well-known single pulsation period of 0.209 d, along with its first and second harmonics. A similar analysis of SMEI and TESS observations yields compatible results, with the higher precision TESS observations also revealing several low-amplitude modes with frequencies below 5 d−1;some of these are likely g modes. The phase lag between photometric and radial velocity maxima - equal to 0.334 cycles - is significantly larger than the typical value of 1/4 observed in other large-amplitude β Cep stars. The phase lag, as well as the strong dependence of phase of maximum light on wavelength, can be reconciled with seismic models only if the dominant mode is the fundamental radial mode. We employ all published photometric and radial velocity measurements, spanning over a century, to evaluate the stability of the pulsation period. The O−C diagram exhibits a clear parabolic shape consistent with a mean rate of period change PÛ = 0.34±0.02 s/cen. The residuals from the best-fit parabola exhibit scatter that is substantially larger than the uncertainties. In particular, dense sampling obtained during the past ∼20 years suggests more complex and rapid period variations. Those data cannot be coherently phased with the mean rate of period change, and instead require PÛ ∼ 0.9 s/cen. We examine the potential contributions of binarity, stellar evolution, and stellar rotation and magnetism to understand the apparent period evolution. Copyright © 2019, The Authors. All rights reserved.

关键词： Photometry

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