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IEEE Conference on Control Technology and Applications (CCTA)

作者： E.M. Berkouk G. Manesse Laboratoire d'electronique de puissance et commande DER Genie Electrive et Informatique-ENPAlger Algiers Algeria

This paper studies the control of the multilevel PWM rectifier-multilevel inverter permanent magnet synchronous machine (PMSM) cascade. We present the field oriented speed control of the PMSM, and develop the control model of the three-level inverters by using the generating functions. We propose a new calculated strategy of the inverter which uses its control model. We show the problem of the middle point of the inverter input DC voltage source. A solution to this problem is to control this input DC voltage and then the potential of its middle point by a feedback control of the three-level PWM rectifier. Thus, we present a control loop of these three-level PWM rectifiers in order to control the input DC voltage of the inverters and the current in the network. This drive system finds applications in high power and high speed drive fields such as the electric traction.

关键词： Pulse width modulation inverters Rectifiers Velocity control Voltage control Pulse width modulation Power system modeling Permanent magnets Feedback control Torque control density estimation robust algorithm

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Performance analysis of orthogonal multicarrier M-ary/SSMA systems

Performance analysis of orthogonal multicarrier M-ary/SSMA s...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： T. Arai H. Habuchi Department of Information Sciences Faculty of Engineering Ibaraki University Hitachi Ibaraki Japan

The performance of orthogonal multicarrier M-ary spread spectrum multiple access (M-ary/SSMA) systems are analyzed under frequency selective fading and partial-band interference. Orthogonal multicarrier M-ary/SSMA systems are the M-ary spread spectrum (M-ary/SSMA) systems utilizing orthogonal multicarrier transmission scheme. In this paper, the bit error rate (BER) performance, the effect of time diversity techniques and the influence of partial-band interference are investigated. As a result, the BER performance of the orthogonal multicarrier M-ary/SSMA system is superior to the conventional multicarrier M-ary/SSMA system without time diversity scheme. Also, the time diversity scheme improves the BER performance against partial-band interference.

关键词： Performance analysis Fading Bit error rate Ambient intelligence density estimation robust algorithm Local area networks Gaussian processes AWGN Degradation Frequency

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Automatic interpretation of contour lines by using external data

Automatic interpretation of contour lines by using external ...

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IEEE Workshop on Applications of Computer Vision (WACV)

作者： F. Dupont M.P. Deseilligny M. Gondran IGN/DT/MATIS Saint Mande France EDF/DER Clamart France

A project on topographic maps interpretation is being driven at I.G.N. (Institut Geographique National, France). The aim of this project is to provide a totally automatic interpretation with a call to operator on the only suspicious cases detected by the program. This paper presents an automatic system for the creation of a Digital Terrain Model (DTM) out of a scanned map. Our proposed method is based on the use of external elevation information and on a combined local/global strategy for quoting the portions of curve present on the map. To reduce the combinatory of the problem, and to accelerate the convergence, all the "trivial cases" of interruption are pretreated. After having quoted the portions of curve, a DTM is created by a classical interpolation method.

关键词： Humans Digital elevation models Acceleration Convergence Interpolation Data mining Roads density estimation robust algorithm Morphology Rails

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Resonant van der Waals repulsion between free excited atom and dielectric surface: an experimental signature

Resonant van der Waals repulsion between free excited atom a...

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International Conference on Quantum Electronics (IQEC)

作者： H. Failache M. Fichlet S. Saltiel D. Bloch M. Ducloy Universite Paris 13 Villetaneuse ÃŽle-de-France FR

Summary form only given. The heated Cs vapor is excited by a pump beam tuned to the D/sub 1/ resonance at 894 nm and by a weak (frequency modulated) probe beam at 876 nm. The pump beam itself is sent off axis, has a large emission linewidth, and is often slightly detuned from the D/sub 1/ line, to populate the intermediate level in a broad velocity band. Experiments have been performed on several Cs vapor cells, with different input windows.

关键词： Resonance density estimation robust algorithm Dielectrics Laser excitation Strontium Pulse generation Delay Gratings Atomic beams Laser theory

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MV active filters for utilities applications

MV active filters for utilities applications

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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： P. Michalak H. Pouliquen N. Vidon S. Puren P. De Larminat J.F. Tissier J.P. Huet M. Gogce EDF/DER Clamart France I. P. Si. S. Cesson-Sevigne France ZI de Chasseneuil Schlumberger Chasseneuil-du-Poitou France

The circulation of harmonic currents on power distribution networks causes an increase in harmonic voltages. This paper presents a comparative study of two filters for MV distribution networks and the manufacture of a... 详细信息

关键词： Active filters Power harmonic filters Substations Power system harmonics Voltage control Pollution Impedance density estimation robust algorithm Power systems Pulp manufacturing

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Total and partial decay widths in vibrational predissociation of the HeI2 van der Waals complex for lower initial vibrational excitations

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INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY 1997年第1期62卷 89-96页

作者： Guan, D Zhao, X Deng, CH Zhang, JZH NYU DEPT CHEMNEW YORKNY 10003

We presented a calculation of the total and partial decay widths of vibrational predissociation (VP) of the HeI2 molecule for low initial vibrational excitations from the lowest van der Waals (vdW) state with total angular momentum J = 0. A time-dependent golden rule wave-packet method was employed in our numerical calculations for the decay widths. The computed total decay widths, lifetimes, and rates of VP are in fairly good agreement with those extrapolated from the experimental data available. Predicted total decay widths as a function of initial vibrational levels exhibit a highly nonlinear behavior. These results demonstrate that a quantum mechanical decay mode for low vibrational excitation remains as well. The total propagation time needed in the time-dependent golden rule wave-packet calculations is much shorter than is the lifetime of the predissociation of HeI2. It is shown that the final-state interaction between the fragments is important for determining the final rotational-state distribution (partial decay width). We find that the major peak position in the final rotational-state distribution shifts to lower rotational energy levels with increase of the initial vibrational quantum number, which is evidently different from that for higher vibrational levels. This fact can be clearly explained by the dependence of the amount of kinetic energy released to the product degrees of freedom on the initial vibrational state. (C) 1997 John Wiley a Sons, Inc.

关键词： Golden-rule treatment Wave packet Fragmentation Dynamics Mechanics Hecl2 Hel2 vibration excitation dynamics mechanic golden rule density estimation robust algorithm Vibrational predissociation LOWER Predissociation Wave packets Mechanics transmission time Partial

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On bifurcations of periodic orbits in the van der Pol-Duffing equation

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INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS 1997年第2期7卷 459-462页

作者： Belyakova, GV Belyakov, LA RES INST APPL MATH & CYBERNET DEPT DIFFERENTIAL EQUATNIZHNII NOVGOROD 603005RUSSIA

Various routes to chaos are demonstrated on an example of the periodically forced van der Pol-Duffing equation.

关键词： BIFURCATION PERIODIC ORBITS density estimation robust algorithm Duffing equation chaos

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Brent Wilson, Ed., Constructivist Learning Environments: Case Studies In Instructional Design. Englewood Cliffs, Nj: Educational Technology Pub., 1996, 252 pp. With Index. [Book Review]

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IEEE Transactions on Professional Communication 1997年第4期40卷 310-312页

作者： H. Van Der Meij Department of Instructional Technology University of Twente Enschede Netherlands

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A theoretical model for crisp and fuzzy time

A theoretical model for crisp and fuzzy time

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Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： B. Van Der Cruyssen R. De Caluwe G. De Tre D. Vandycke Department of Telecommunications and Information Processing Computer Science Laboratory University of Ghent Belgium

Based on the way time is expressed in natural language, as was studied in the linguistic part of our research, it is observed that time indications usually are rather approximative and situated within the context of the traditional hierarchical time unit system, thereby choosing the most appropriate level of detail. In this paper we present a model for temporal data which aims at being both as flexible and as general as possible. Flexibility is obtained by the use of fuzzy set theory and of granularities which brings the model very close to its natural language counterpart. Generality is achieved by the dynamic aspect of the granularity structure and by the support of spans, time points and intervals, absolute and relative time, aperiodic as well as periodic time elements.

关键词： Natural languages Object oriented databases Fuzzy set theory density estimation robust algorithm Computer science Laboratories Information processing Fuzzy sets Periodic structures Database systems

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Spatio-temporal dynamics in an array of time delayed Van der Pol oscillators

Spatio-temporal dynamics in an array of time delayed Van der...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： N. Miyabayashi S. Moro S. Mori IDepi . of Electrical Engineering Keio University Yokohama Japan

The spatio-temporal phenomena in coupled map lattices (CML) are investigated. We propose time delayed Van der Pol oscillator as a unit lattice of CML, which is described with discrete time. This is the first attempt to construct CML with realizable circuits, as far as we know. Clusterization and the ways of collapse of clusters to spatio-temporal chaos are observed in this system.

关键词： Delay effects density estimation robust algorithm Oscillators Chaos Coupling circuits Distributed parameter circuits Spatiotemporal phenomena Differential equations Biological system modeling Power system modeling

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