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Analysis of Errors in a High Accuracy Sampled-data Stabilising System Operating with a Wide Range of PWM

IFAC Proceedings Volumes 2014年第3期47卷 9241-9246页

作者： Ruslan Zarovskyi Roustiam Chakirov Yuriy Vagapov Department of Industrial Electronics Chernihiv State Technological University 95 Shevchenko Street Chernihiv 14027 Ukraine Department of Electrical and Mechanical Engineering Bonn-Rhein-Sieg University of Applied Science 20 Grantham-Allee Sankt Augustin D-53757 Germany Department of Engineering and Applied Physics Glyndwr University Plas Coch Mold Road Wrexham LL11 2AW UK

This paper presents a new method of analysing the error of a sampled-data velocity stabilising system with a wide range of pulse width modulation. The analysis is based on multi-channel model obtained as a result of approximation of pulse-modulated signal at the output of a PWM converter. Approximation of piecewise-linear modulation characteristics of each channel has been obtained as a series expansion of Hermite polynomials where the expansion comprises two polynomials of the first and third orders. The transfer function of every channel and a closed-loop system has been obtained using multidimensional Z-transform. The analytical expression of an error under impact of a step input has been derived using a transfer function of the closed-loop system. A dc electric drive has been used as an example of high accuracy sample-data stabilising system to verify and demonstrate the proposed method.

关键词： Nonlinear sampled-data system Pulse-width modulation Volterra-Wiener series Multidimensional Z-transforms dc electric drive

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Combined Measurement of the Higgs Boson Mass in pp Collisions at s=7 and 8 TeV with the ATLAS and CMS Experiments

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Physical Review Letters 2015年第19期114卷 191803-191803页

作者： G. Aad B. Abbott J. Abdallah O. Abdinov R. Aben M. Abolins O. S. AbouZeid H. Abramowicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya L. Adamczyk D. L. Adams J. Adelman S. Adomeit T. Adye A. A. Affolder T. Agatonovic-Jovin J. A. Aguilar-Saavedra S. P. Ahlen F. Ahmadov G. Aielli H. Akerstedt T. P. A. Åkesson G. Akimoto A. V. Akimov G. L. Alberghi J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander T. Alexopoulos M. Alhroob G. Alimonti L. Alio J. Alison S. P. Alkire B. M. M. Allbrooke P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheimer B. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi B. T. Amadio K. Amako Y. Amaral Coutinho C. Amelung D. Amidei S. P. Amor Dos Santos A. Amorim S. Amoroso N. Amram G. Amundsen C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders G. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei S. Angelidakis I. Angelozzi P. Anger A. Angerami F. Anghinolfi A. V. Anisenkov N. Anjos A. Annovi M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki L. Aperio Bella G. Arabidze Y. Arai J. P. Araque A. T. H. Arce F. A. Arduh J-F. Arguin S. Argyropoulos M. Arik A. J. Armbruster O. Arnaez V. Arnal H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Asai N. Asbah A. Ashkenazi B. Åsman L. Asquith K. Assamagan R. Astalos M. Atkinson N. B. Atlay B. Auerbach K. Augsten M. Aurousseau G. Avolio B. Axen M. K. Ayoub G. Azuelos M. A. Baak A. E. Baas C. Bacci H. Bachacou K. Bachas M. Backes M. Backhaus E. Badescu P. Bagiacchi P. Bagnaia Y. Bai T. Bain J. T. Baines O. K. Baker P. Balek T. Balestri F. Balli E. Banas Sw. Banerjee A. A. E. Bannoura H. S. Bansil L. Barak S. P. Baranov E. L. Barberio D. Barberis M. Barbero T. Barillari M. Barisonzi T. Barklow N. Barlow S. L. Barnes B. M. Barnett R. M. Barnett Z. Barnovska A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa R. Bartoldus A. E. Barton P. Bartos A. Bassalat A. Basye R. L. Bates S. J. Batista J. R. Batley M. Battaglia M. Bauce F. Bauer H. S. Bawa J. B. Beach CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Academia Sinica Taipei Taiwan Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands Department of Physics and Astronomy Michigan State University East Lansing Michigan USA Department of Physics University of Toronto Toronto Ontario Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion: Israel Institute of Technology Haifa Israel CERN Geneva Switzerland Department of Physics Stockholm University Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Institute of Physics University of Belgrade Belgrade Serbia Laboratorio de Instrumentacao e Fisica Experimental de Particulas-LIP Lisboa Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada (Spain) Portugal Department of Physics Boston University Boston Massachusetts USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Roma Italy Dipartimento di Fisica Università di Roma Tor Vergata Roma Italy Fysiska institutionen Lunds universitet Lund Sweden International Center for Elementary Particle Physics and Depart

A measurement of the Higgs boson mass is presented based on the combined data samples of the ATLAS and CMS experiments at the CERN LHC in the H→γγ and H→ZZ→4ℓ decay channels. The results are obtained from a simultaneous fit to the reconstructed invariant mass peaks in the two channels and for the two experiments. The measured masses from the individual channels and the two experiments are found to be consistent among themselves. The combined measured mass of the Higgs boson is mH=125.09±0.21 (stat)±0.11 (syst) GeV.

关键词： HIGGS bosons RESEARCH COLLISIONS (Nuclear physics) ATLAS (Computer program language) REST mass (Relativity) BOSONS

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Metastable States and Wetting Transition of Submerged Superhydrophobic Structures

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Physical Review Letters 2014年第19期112卷 196101-196101页

作者： Pengyu Lv Yahui Xue Yipeng Shi Hao Lin Huiling Duan State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering Science College of Engineering Peking University Beijing 100871 China Key Laboratory of High Energy Density Physics Simulation Center for Applied Physics and Technology Peking University Beijing 100871 China Mechanical and Aerospace Engineering Rutgers The State University of New Jersey 98 Brett Road Piscataway New Jersey 08854 USA

Superhydrophobicity on structured surfaces is frequently achieved via the maintenance of liquid-air interfaces adjacent to the trapped air pockets. These interfaces, however, are subject to instabilities due to the Cassie-Baxter-to-Wenzel transition and total wetting. The current work examines in situ liquid-air interfaces on a submerged surface patterned with cylindrical micropores using confocal microscopy. Both the pinned Cassie-Baxter and depinned metastable states are directly observed and measured. The metastable state dynamically evolves, leading to a transition to the Wenzel state. This process is extensively quantified under different ambient pressure conditions, and the data are in good agreement with a diffusion-based model prediction. A similarity law along with a characteristic time scale is derived which governs the lifetime of the air pockets and which can be used to predict the longevity of underwater superhydrophobicity.

关键词： HYDROPHOBIC surfaces RESEARCH METASTABLE states WETTING LIQUID air physics research

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Reconfigurable Nanostructures-New Designs for Medicine

Reconfigurable Nanostructures-New Designs for Medicine

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中国微米纳米技术学会纳米科学技术分会第三届年会暨2014全国纳米生物与医学学术会议

作者： Haiqing Dong Yongyong Li Dong Qian Donglu Shi Shanghai East Hospital Institute for biomedical engineering & Nano science School of MedicineTongji UniversityShanghai 200092 Dept. of Mechanical Engineering the University of Texas at DallasRichardsonTX 75080 The Materials Science and Engineering Program Department of Mechanical and Materials EngineeringCollege of Engineering and Applied ScienceUniversity of CincinnatiCincinnatiOH 45221USA

A key challenge in nanomaterials development is the control and manipulation of the structure at the *** are able to meet this challenge through reconfigurable arrays configured on graphene nano-sheets(GNS).Our approach is a new paradigm in materials *** synthesis relies on identification of thermodynamically stable phases and synthesis via chemical *** conventional approach targets a specific functionality,which is fixed once synthesis is *** seek to circumvent the restrictions of conventional synthesis through reconfigurable nanostructural assembly.

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Nanostructure investigations of nonlinear differential conductance in NdNiO3 thin films

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Physical Review B 2014年第20期90卷 205117-205117页

作者： Will J. Hardy Heng Ji Evgeny Mikheev Susanne Stemmer Douglas Natelson Applied Physics Program Rice Quantum Institute Rice University Houston Texas 77005 USA Department of Physics and Astronomy Rice University Houston Texas 77005 USA Materials Department University of California Santa Barbara California USA Department of Electrical and Computer Engineering and Department of Materials Science and Nanoengineering Rice University Houston Texas 77005 USA

Transport measurements on thin films of NdNiO3 reveal a crossover to a regime of pronounced nonlinear conduction below the well-known metal-insulator transition temperature. The evolution of the transport properties at temperatures well below this transition appears consistent with a gradual formation of a gap in the holelike Fermi surface of this strongly correlated system. As T is decreased below the nominal transition temperature, transport becomes increasingly non-Ohmic, with a model of Landau-Zener breakdown becoming most suited for describing I(V) characteristics as the temperature approaches 2 K.

关键词： ELLIPSOMETRY THIN films NANOSTRUCTURED materials SOLID state electronics MAGNETRON sputtering

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Inhibition Causes Ceaseless Dynamics in Networks of Excitable Nodes

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Physical Review Letters 2014年第13期112卷 138103-138103页

作者： Daniel B. Larremore Woodrow L. Shew Edward Ott Francesco Sorrentino Juan G. Restrepo Department of Epidemiology Harvard School of Public Health Boston Massachusetts 02115 USA Center for Communicable Disease Dynamics Harvard School of Public Health Boston Massachusetts 02115 USA Department of Physics University of Arkansas Fayetteville Arkansas 72701 USA Institute for Research in Electronics and Applied Physics University of Maryland College Park Maryland 20742 USA Department of Mechanical Engineering University of New Mexico Albuquerque New Mexico 87106 USA Department of Applied Mathematics University of Colorado Boulder Colorado 80309 USA

The collective dynamics of a network of excitable nodes changes dramatically when inhibitory nodes are introduced. We consider inhibitory nodes which may be activated just like excitatory nodes but, upon activating, decrease the probability of activation of network neighbors. We show that, although the direct effect of inhibitory nodes is to decrease activity, the collective dynamics becomes self-sustaining. We explain this counterintuitive result by defining and analyzing a “branching function” which may be thought of as an activity-dependent branching ratio. The shape of the branching function implies that, for a range of global coupling parameters, dynamics are self-sustaining. Within the self-sustaining region of parameter space lies a critical line along which dynamics take the form of avalanches with universal scaling of size and duration, embedded in a ceaseless time series of activity. Our analyses, confirmed by numerical simulation, suggest that inhibition may play a counterintuitive role in excitable networks.

关键词： INHIBITION (Chemistry) EXCITABLE membranes PROBABILITY theory COMPUTER simulation DISTRIBUTION (Probability theory)

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Probabilistically Controlled Teleportation of an Arbitrary Two-Qubit State via Positive Operator-Valued Measure

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Communications in Theoretical physics 2013年第5期59卷 554-558页

作者：许海峰韩莲芳 School of Mechanical and Electronical Engineering Suzhou College School of Physics and Material Science Anhui University Department of Applied Physics School of Life ScienceAnhui Medical University

We propose a tripartite scheme for probabilistically teleporting an arbitrary two-qubit state with a fourqubit cluster-class state and a Bell-class state as the quantum channels. In the scheme, the sender and the controller make Bell-state measurements (BSMs) on their respective qubit pairs. With their measurement results, the receiver can reconstruct the original state probabilistically by introducing two auxiliary particles and making appropriate unitary operations and positive operator-valued measure (POVM) instead of usual projective measurement. Moreover, the total success probability and classical communication cost of the present protocol are also worked out.

关键词： controlled teleportation pure entangled quantum channels positive operator-valued measure success probability classical communication cost

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Conduction at a Ferroelectric Interface

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Physical Review applied 2014年第5期2卷 051001-051001页

作者： Matthew S. J. Marshall Andrei Malashevich Ankit S. Disa Myung-Geun Han Hanghui Chen Yimei Zhu Sohrab Ismail-Beigi Frederick J. Walker Charles H. Ahn Center for Research on Interface Structures and Phenomena (CRISP) Yale University New Haven Connecticut 06520 USA Department of Applied Physics Yale University New Haven Connecticut 06520 USA Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Upton New York 11973 USA Department of Mechanical Engineering and Materials Science Yale University New Haven Connecticut 06520 USA

Typical logic elements utilizing the field effect rely on the change in carrier concentration due to the field in the channel region of the device. Ferroelectric-field-effect devices provide a nonvolatile version of this effect due to the stable polarization order parameter in the ferroelectric. In this work, we describe an oxide/oxide ferroelectric heterostructure device based on (001)-oriented PbZr0.2Ti0.8O3−LaNiO3 where the dominant change in conductivity is a result of a significant mobility change in the interfacial channel region. The effect is confined to a few atomic layers at the interface and is reversible by switching the ferroelectric polarization. More interestingly, in one polarization state, the field effect induces a 1.7-eV shift of the interfacial bands to create a new conducting channel in the interfacial PbO layer of the ferroelectric.

关键词： Lead oxide

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Synthesis and transport properties of superconducting thin films of K0.33WO3: Tc reduction due to disorder

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Physical Review B 2014年第18期89卷 184501-184501页

作者： Phillip M. Wu Chris Hart Katherine Luna Ko Munakata Akio Tsukada Subhash H. Risbud T. H. Geballe M. R. Beasley Department of Applied Physics Stanford University Stanford California 94305 USA and Geballe Laboratory for Advanced Materials Stanford University Stanford California 94305 USA Materials Science and Engineering Program University of California Davis California 95616 USA

Via a two-step deposition and post-annealing procedure, K-doped WO3 thin films with reproducible transport properties are obtained. We observe a larger critical field Hc2 along the c axis, consistent with the picture of the Fermi surface containing one-dimensional bands along this direction. Reducing the film thickness results in a superconductor to insulator transition. Scanning electron microscopy (SEM) images show that KWO3 crystallites become less connected as the deposition time is reduced, providing a microscopic explanation for the transport behavior. In the superconducting films, a resistive anomaly is observed similar to bulk crystals, with a characteristic temperature that shifts lower with decreasing film thickness. The competing electronic effects manifest as a suppression of the density of states at the Fermi level, observed using point contact tunneling spectroscopy, demonstrating that disorder-induced increased Coulomb interactions are present. Using the theory of Belitz for the reduction of Tc due to disorder, we can infer that the film with the highest observed Tc has a relatively large disorder dependent electron-phonon interaction parameter ∼1.2. Understanding microscopically why certain films display higher Tc will aid in the search for the trace high-Tc superconducting anomalies observed in lightly surface doped bronzes.

关键词： ANNEALING of semiconductors SUPERCONDUCTING thin films SCANNING electron microscopy CRYSTAL structure SPECTRUM analysis

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A new neural networks-based model of hysteresis

A new neural networks-based model of hysteresis

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World Congress on Intelligent Control and Automation (WCICA)

作者： Lianwei Ma Yu Shen Jinrong Li Xinlong Zhao School of Automation and Electrical Engineering Zhejiang University of Science and Technology Hangzhou China Department of Applied Physics Zhejiang University of Science and Technology Hangzhou China College of Mechanical Engineering and Automation Zhejiang Sci-Tech University Hangzhou China

A new approach to constructing hysteretic operator is proposed in this paper. Based on the hysteretic operator, the input space of neural networks is expanded from 1-dimension to 2-dimension and the multi-value mapping of hysteresis is transformed into one-to-one mapping. Based on the expanded input space, a neural network is employed to approximate hysteresis. The result of an experimental example suggests the proposed approach is effective.

关键词： Hysteresis Biological neural networks Data models Neurons Predictive models Artificial neural networks

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