Robust Timing Synchronization for AC-OFDM Based Optical Wireless Communications
Ranjha, Bilal A; Kavehrad, Mohsen; Deng, Peng
2015-01-01T23:59:59.000Z
Visible light communications (VLC) have recently attracted a growing interest and can be a potential solution to realize indoor wireless communication with high bandwidth capacity for RF-restricted environments such as airplanes and hospitals. Optical based orthogonal frequency division multiplexing (OFDM) systems have been proposed in the literature to combat multipath distortion and intersymbol interference (ISI) caused by multipath signal propagation. In this paper, we present a robust timing synchronization scheme suitable for asymmetrically clipped (AC) OFDM based optical intensity modulated direct detection (IM/DD) wireless systems. Our proposed method works perfectly for ACO-OFDM, Pulse amplitude modulated discrete multitone (PAM-DMT) and discrete Hartley transform (DHT) based optical OFDM systems. In contrast to existing OFDM timing synchronization methods which are either not suitable for AC OFDM techniques due to unipolar nature of output signal or perform poorly, our proposed method is suitable for...
Li, Charles
Dynamic magnetization states of a spin valve in the presence of dc and ac currents: Synchronization and numerical calculations of dynamic magnetization states of a spin valve in the presence of dc and ac currents are expected to appear. In this paper, we consider a simple spin valve as a model system to study the problem
Synchronicity from synchronized chaos
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Duane, Gregory [Univ. of Colorado, Boulder, CO (United States); Macedonia Academy of Sciences and Arts, Skopje (Macedonia); Univ. of Bergen, Bergen (Norway)
2015-04-01T23:59:59.000Z
The synchronization of loosely-coupled chaotic oscillators, a phenomenon investigated intensively for the last two decades, may realize the philosophical concept of “synchronicity”—the commonplace notion that related events mysteriously occur at the same time. When extended to continuous media and/or large discrete arrays, and when general (non-identical) correspondences are considered between states, intermittent synchronous relationships indeed become ubiquitous. Meaningful synchronicity follows naturally if meaningful events are identified with coherent structures, defined by internal synchronization between remote degrees of freedom; a condition that has been posited as necessary for synchronizability with an external system. The important case of synchronization between mind and matter is realized if mind is analogized to a computer model, synchronizing with a sporadically observed system, as in meteorological data assimilation. Evidence for the ubiquity of synchronization is reviewed along with recent proposals that: (1) synchronization of different models of the same objective process may be an expeditious route to improved computational modeling and may also describe the functioning of conscious brains; and (2) the nonlocality in quantum phenomena implied by Bell’s theorem may be explained in a variety of deterministic (hidden variable) interpretations if the quantum world resides on a generalized synchronization “manifold”.
Synchronicity from synchronized chaos
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Duane, Gregory
2015-04-01T23:59:59.000Z
The synchronization of loosely-coupled chaotic oscillators, a phenomenon investigated intensively for the last two decades, may realize the philosophical concept of “synchronicity”—the commonplace notion that related events mysteriously occur at the same time. When extended to continuous media and/or large discrete arrays, and when general (non-identical) correspondences are considered between states, intermittent synchronous relationships indeed become ubiquitous. Meaningful synchronicity follows naturally if meaningful events are identified with coherent structures, defined by internal synchronization between remote degrees of freedom; a condition that has been posited as necessary for synchronizability with an external system. The important case of synchronization between mind andmore »matter is realized if mind is analogized to a computer model, synchronizing with a sporadically observed system, as in meteorological data assimilation. Evidence for the ubiquity of synchronization is reviewed along with recent proposals that: (1) synchronization of different models of the same objective process may be an expeditious route to improved computational modeling and may also describe the functioning of conscious brains; and (2) the nonlocality in quantum phenomena implied by Bell’s theorem may be explained in a variety of deterministic (hidden variable) interpretations if the quantum world resides on a generalized synchronization “manifold”.« less
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41clothThe Bonneville PowerTariff Pages default Sign InCenter3.82Mapping theMarsScienceSecurity8MatthewMauro GregorioMax
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirtA Journey Inside the Complex andFOUR Los Alamos innovationsMKoepf Postdoctoral Fellow SubtaskMax
Disrupted Neural Synchronization in Toddlers with Autism
Behrmann, Marlene
Neuron Report Disrupted Neural Synchronization in Toddlers with Autism Ilan Dinstein,1,4,* KarenAutism Center of Excellence 2Department of Psychiatry 3Department of Neurosciences University 15213, USA *Correspondence: ilan.dinstein@weizmann.ac.il DOI 10.1016/j.neuron.2011.04.018 SUMMARY Autism
Fault tolerant pulse synchronization
Deconda, Keerthi
2009-05-15T23:59:59.000Z
Pulse synchronization is the evolution of spontaneous firing action across a network of sensor nodes. In the pulse synchronization model all nodes across a network produce a pulse, or "fire", at regular intervals even without access to a shared...
Synchronous Reactive Systems Stephen Edwards
-state machines 5 #12;STEPHEN EDWARDS SYNCHRONOUS REACTIVE SYSTEMS The Synchronous Model of Time SynchronousSynchronous Reactive Systems Stephen Edwards http://www.eecs.berkeley.edu/~sedwards/ University of California, Berkeley #12;STEPHEN EDWARDS SYNCHRONOUS REACTIVE SYSTEMS Outline Synchronous Reactive Systems
"apsched: request exceeds max nodes, alloc"
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
"apsched: request exceeds max nodes, alloc" runtime error message: "apsched: request exceeds max nodes, alloc" September 12, 2014 (0 Comments) Symptom: User jobs with single or...
Methods, systems and apparatus for synchronous current regulation of a five-phase machine
Gallegos-Lopez, Gabriel; Perisic, Milun
2012-10-09T23:59:59.000Z
Methods, systems and apparatus are provided for controlling operation of and regulating current provided to a five-phase machine when one or more phases has experienced a fault or has failed. In one implementation, the disclosed embodiments can be used to synchronously regulate current in a vector controlled motor drive system that includes a five-phase AC machine, a five-phase inverter module coupled to the five-phase AC machine, and a synchronous current regulator.
Efficient Barrier Synchronization Mechanism for the BSP Model on Message-Passing Architectures
Ha, Soonhoi
Efficient Barrier Synchronization Mechanism for the BSP Model on Message-Passing Architectures Jin-742, KOREA jinsoo, sha, csjhonÂˇ @comp.snu.ac.kr Abstract The Bulk Synchronous Parallel (BSP) model of computa- tion can be used to develop efficient and portable programs for a range of machines
Transient Uncoupling Induces Synchronization
Malte Schröder; Manu Mannattil; Debabrata Dutta; Sagar Chakraborty; Marc Timme
2015-08-26T23:59:59.000Z
Finding conditions that support synchronization is a fertile and active area of research with applications across multiple disciplines. Here we present and analyze a scheme for synchronizing chaotic dynamical systems by transiently uncoupling them. Specifically, systems coupled only in a fraction of their state space may synchronize even if fully coupled they do not. Although, for many standard systems, coupling strengths need to be bounded to ensure synchrony, transient uncoupling removes this bound and thus enables synchronization in an infinite range of effective coupling strengths. The presented coupling scheme thus opens up the possibility to induce synchrony in (biological or technical) systems whose parameters are fixed and cannot be modified continuously.
Tolmach, Andrew
Cloud Security Survey by Max Garvey #12;Cloudy Cloud is Cloudy What is the cloud? On Demand Service Network access Resource pooling Elasticity of Resources Measured Service #12;Cloud Types/Variants Iaa Cloud Public Cloud Hybrid Cloud combination. Private cloud with overflow going to public cloud. #12
Alvarez-Cohen, Lisa
· anthropology 2AC · american studies 10AC · gender and womens studies 50AC · music 26AC · spanish 135AC 50AC · music 26AC · spanish 135AC · sociology 190AC · public policy 117AC · peace and conflict studies 10AC · gender and womens studies 50AC · music 26AC · spanish 135AC · sociology 190AC · public
Max-Planck-Institut fr biologische Kybernetik Max Planck Institute for Biological Cybernetics
Engineering (Aeronautics) The Max Planck Institute for Biological Cybernetics in Tübingen, Germany launches
Synchronization in complex networks
Arenas, A.; Diaz-Guilera, A.; Moreno, Y.; Zhou, C.; Kurths, J.
2007-12-12T23:59:59.000Z
Synchronization processes in populations of locally interacting elements are in the focus of intense research in physical, biological, chemical, technological and social systems. The many efforts devoted to understand synchronization phenomena in natural systems take now advantage of the recent theory of complex networks. In this review, we report the advances in the comprehension of synchronization phenomena when oscillating elements are constrained to interact in a complex network topology. We also overview the new emergent features coming out from the interplay between the structure and the function of the underlying pattern of connections. Extensive numerical work as well as analytical approaches to the problem are presented. Finally, we review several applications of synchronization in complex networks to different disciplines: biological systems and neuroscience, engineering and computer science, and economy and social sciences.
Power Supply Synchronization without Communication
Hespanha, Joăo Pedro
1 Power Supply Synchronization without Communication Leonardo A. B. T^orres, Jo~ao P. Hespanha, Jeff Moehlis Abstract--We consider the synchronization of power supplies in an isolated grid with multiple small-to-medium power sources. We show how to achieve a coordinated or synchronized behavior
Advanced synchronous luminescence system
Vo-Dinh, T.
1997-02-04T23:59:59.000Z
A method and apparatus are disclosed for determining the condition of tissue or otherwise making chemical identifications includes exposing the sample to a light source, and using a synchronous luminescence system to produce a spectrum that can be analyzed for tissue condition. 14 figs.
Min-max and min-max regret versions of some combinatorial optimization problems : a survey
Boyer, Edmond
, such as deterministic or stochastic approaches, will fail to protect against exceptional high-impact events (earthquakes-clefs : Min-max, min-max regret, optimisation combinatoire, complexité, ap- proximation, analyse de robustesse in order to max- imize the level of protection. Quantifying the protection level using the expected impact
Synchronization and Power Sharing for Droop-Controlled Inverters in Islanded Microgrids
Bullo, Francesco
Synchronization and Power Sharing for Droop-Controlled Inverters in Islanded Microgrids John W in an inductive microgrid. We show that a network of loads and DC/AC inverters equipped with power-frequency droop the additional property that it preserves the power sharing properties of the primary droop controller. Our
Max Tech and Beyond Design Competition
Broader source: Energy.gov [DOE]
The Max Tech and Beyond Design Competition is an annual competition run by the Department of Energy (DOE) and the Lawrence Berkeley National Laboratory (LBNL) that challenges students to design...
Communication using Synchronized Chaotic Systems
Anlage, Steven
Communication using Synchronized Chaotic Systems Rachel Kramer Adam Cohen Bhargava Ravoori Thomas E the adaptive strategy implemented. communications · Such systems are sensitive to perturbations · Communications systems are sensitive to perturbations in the communication channel · An adaptive strategy has
Optimal synchronization of complex networks
Per Sebastian Skardal; Dane Taylor; Jie Sun
2014-10-17T23:59:59.000Z
We study optimal synchronization in networks of heterogeneous phase oscillators. Our main result is the derivation of a synchrony alignment function that encodes the interplay between network structure and oscillators' frequencies and can be readily optimized. We highlight its utility in two general problems: constrained frequency allocation and network design. In general, we find that synchronization is promoted by strong alignments between frequencies and the dominant Laplacian eigenvectors, as well as a matching between the heterogeneity of frequencies and network structure.
Introduction to Graduate Research Max J. Egenhofer
Egenhofer, Max J.
a graduate degree A researcher's credentials (CV, publication list) Types of research Literature search SpeedSIE 501 Introduction to Graduate Research Max J. Egenhofer #12;Pragmatics 1-credit course · First;Topics Covered Measures of research success Goals of academic research Research life cycle How to get
Max-Planck-Institut f ur Mathematik
physics are conÂ sistent with the Moyal product of noncommutative field theory. An exampleÂWitten noncommutative gauge theories by Friedemann Brandt, Carmelo P. Martin, and Fernando Ruiz Ruiz Preprint no.: 70ÂWitten noncommutative gauge theories Friedemann Brandt MaxÂPlanckÂInstitute for Mathematics in the Sciences, InselstraĂ?e
Max-Planck-Institut fur Mathematik
18 1 Introduction Noncommutative quantum field theories (NCQFT) enjoy wide popularity among theoret. Quantum field theory on a noncommutative Minkowski spacetime was rigorously realised in [8]. The quantumJun2012 Wedge-Local Quantum Fields on a Nonconstant Noncommutative Spacetime A. Much Max
Max-Planck-Institut fur Mathematik
Max-Planck-Institut f¨ur Mathematik in den Naturwissenschaften Leipzig Local Thermal Equilibrium;#12;Local Thermal Equilibrium States in Relativistic Quantum Field Theory Michael Gransee Abstract. It is well-known that thermal equilibrium states in quan- tum statistical mechanics and quantum field theory
Max-Planck-Institut fur Mathematik
Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012) Corresponding author Dimensions $ L. Banjaia,1 , M. Kachanovskab, aDepartment of Mathematics, Heriot-Watt University, Edinburgh, EH14 4AS,UK bMax Planck Institute for Mathematics in the Sciences, Inselstr. 22, 04103 Leipzig
Morash, R.T. [Precise Power Corp., Bradenton, FL (United States)
1998-12-31T23:59:59.000Z
A new synchronous motor is a high-efficiency AC machine that has a low starting current. It may be used for conventional loads and also to start high inertia loads, delivering a constant torque during starting. Acceleration to synchronous speed can be allowed to take several minutes, if necessary, because the low starting current precludes excessive heating in the motor. Some of these motors are constructed with integral high inertia rotors that act as flywheels. These synchronous motors can ride through power sags and interruptions up to 30 seconds or more while still delivering useful load to pumps, fans, blowers, and compressors. The motors also restart instantly and resynchronize when utility power recovers. The motor can be useful in many heating, ventilating, and air-conditioning (HVAC) applications including those where machines and processes might otherwise be forced to shut down during momentary power interruptions.
Straube, Arthur V.
of synchronization in driven colloids Michael P.N. Juniper1, Arthur V. Straube2, Rut Besseling3, Dirk G.A.L. Aarts1 for materials should be addressed to R.P.A.D. (email: roel.dullens@chem.ox.ac.uk). NATURE COMMUNICATIONS | 6. All rights reserved. #12;I n the natural world, little exists in a state of true equilibrium; in fact
Max-Planck-Institut f ur Mathematik
by the equations: (1.1) (# t +D)u = 0, u(x; 0) = #, and Bu = 0. The specific heat # is a section to the dual bundle V # . Let #(#, #, D, B)(t) := # M u# be the total heat energy content. As t # 0, there is a completeMax-Planck-Institut fË? ur Mathematik in den Naturwissenschaften Leipzig Heat content asymptotics
. DC AC ) .( . ,, 'Spice .Spice . : 0 0 E1 PWR(V(%IN+, %IN . )2.3( Etable " . . : 00 V1 0Vdc E2 Pwr(V(%IN+, %IN-),2) ETABLE TABLE = (5
Objects and Synchronous Programming Charles ANDR1
AndrĂ©, Charles
gener- ated by a synchronous language compiler, the user must provide an execution machine [AND 93]. OurÂ 1 Â Objects and Synchronous Programming Charles ANDRĂ?1 , FrĂ©dĂ©ric BOULANGER2 , Marie logical correctness, is the essence of the synchronous paradigm. This paper proposes to combine these two
Synchronous Machine Modeling 1.0 Introduction
McCalley, James D.
Synchronous Machine Modeling 1.0 Introduction Our motivation at this point is to put you in a position to understand synchronous machine modeling for power system dynamic analysis. If you take EE 457 to synchronous machine models. But I hope to improve on this with these notes. Please read both. One last comment
Targeting engineering synchronization in chaotic systems
Sourav K. Bhowmick; Dibakar Ghosh
2015-06-14T23:59:59.000Z
A method of targeting engineering synchronization states in two identical and mismatch chaotic systems is explained in details. The method is proposed using linear feedback controller coupling for engineering synchronization such as mixed synchronization, linear and nonlinear generalized synchronization and targeting fixed point. The general form of coupling design to target any desire synchronization state under unidirectional coupling with the help of Lyapunov function stability theory is derived analytically. A scaling factor is introduced in the coupling definition to smooth control without any loss of synchrony. Numerical results are done on two mismatch Lorenz systems and two identical Sprott oscillators.
Neurton Damage and MAX Phase Ternary Compounds
Barsoum, Michael; Hoffman, Elizabeth; Sindelar, Robert; Garcua-Duaz, Brenda; Kohse, Gordon
2014-06-17T23:59:59.000Z
The Demands of Gen IV nuclear power plants for long service life under neutron radiation at high temperature are severe. Advanced materials that would withstand high temperatures (up to 1000+ C) to high doses in a neutron field would be ideal for reactor internal structures and would add to the long service life and reliability of the reactors. The objective of this work is to investigate the resonse of a new class of machinable, conductive, layered, ternary transition metal carbides and nitrides - the so-called MAX phases - to low and moderate neutron dose levels.
Max-Planck-Institut fr biologische Kybernetik Max Planck Institute for Biological Cybernetics
and analysis of human psychophysical experiments. · Good understanding of the English language in speaking Position in Human Motion Simulation The Max Planck Institute for Biological Cybernetics in Tübingen laws of perception will be implemented into the control framework of motion-based simulators. Human
Digital-data receiver synchronization
Smith, Stephen F.; Turner, Gary W.
2005-08-02T23:59:59.000Z
Digital-data receiver synchronization is provided with composite phase-frequency detectors, mutually cross-connected comparison feedback or both to provide robust reception of digital data signals. A single master clock can be used to provide frequency signals. Advantages can include fast lock-up time in moderately to severely noisy conditions, greater tolerance to noise and jitter when locked, and improved tolerance to clock asymmetries.
AVTA: 2013 Ford C-MAX HEV Testing Results
Broader source: Energy.gov [DOE]
VTO's National Laboratories have tested and collected both dynamometer and fleet data for the Ford C-MAX HEV (a hybrid electric vehicle).
Tensor products of AC charges and AC Radon measures are not always AC charges
Buczolich, Zoltán
Tensor products of AC #3; charges and AC Radon measures are not always AC #3; charges Zolt#19;an and an absolutely continuous Radon measure #22; on R such that F #22; is not an AC#3; charge on R 2 . 1 Introduction In [1] the tensor problem was stated for the tensor product of AC #3; charges and the Lebesgue
Synchronous Message Passing V. V. Murty and V. K. Garg
Garg, Vijay
Synchronous Message Passing V. V. Murty and V. K. Garg TR ECE-PDS-93-01 October 1993 Parallel, Texas 78712 THEUNI VERSITY O FTEXAS AT AUSTIN D ISCIPLINA PRAESIDIUM CIVITATIS #12;Synchronous Message of synchronous ordering of messages. Synchronous ordering of messages de nes synchronous communication based
Max-Planck-Institut f ur Mathematik
, Cambridge, CB3 OWA eÂmail: D.M.A.Stuart@damtp.cam.ac.uk Abstract The longÂtime asymptotics is analyzed for finite energy solutions of the 1D SchrË?odinger equation coupled to a nonlinear oscillator. The coupled to the free SchrË?odinger equation. The proofs use the strategy of BuslaevÂPerelman [3, 4]: the linerization
Mechanisms Behind the Generalized Synchronization Conditions
A. A. Koronovskii; O. I. Moskalenko; A. E. Hramov
2006-02-25T23:59:59.000Z
A universal mechanism underlying generalized synchronization conditions in unidirectionally coupled stochastic oscillators is considered. The consideration is carried out in the framework of a modified system with additional dissipation. The approach developed is illustrated with model examples. The conclusion is reached that two types of the behavior of nonlinear dynamic systems known as generalized synchronization and noise-induced synchronization, which are viewed as different phenomena, actually represent a unique type of the synchronous behavior of stochastic oscillators and are caused by the same mechanism.
Collection of Mutually Synchronized Chaotic Systems
A. I. Lerescu; S. Oancea; I. Grosu
2006-03-17T23:59:59.000Z
A general explicit coupling for mutual synchronization of two arbitrary identical continuous systems is proposed. The synchronization is proved analytically. The coupling is given for all 19 systems from Sprott's collection. For one of the systems the numerical results are shown in detail. The method could be adopted for the teaching of the topic.
Isochronal synchronization of delay-coupled systems
Ira B. Schwartz; Leah B. Shaw
2007-02-25T23:59:59.000Z
We consider small network models for mutually delay-coupled systems which typically do not exhibit stable isochronally synchronized solutions. We show that for certain coupling architectures which involve delayed self feedback to the nodes, the oscillators become isochronally synchronized. Applications are shown for both incoherent pump coupled lasers and spatio-temporal coupled fiber ring lasers.
Binarization of Synchronous Context-Free Grammars
Binarization of Synchronous Context-Free Grammars Liang Huang USC/Information Science Institute Hao Systems based on synchronous grammars and tree transducers promise to improve the quality of statistical machine translation output, but are often very computationally intensive. The complexity is exponential
Scalable Synchronous Queues William N. Scherer III
Scott, Michael L.
Scalable Synchronous Queues William N. Scherer III University of Rochester scherer@cs.rochester.edu Abstract We present two new nonblocking and contention-free implementa- tions of synchronous queues. We present performance results on 16-processor SPARC and 4- processor Opteron machines. We compare
On synchronous robotic networks - Part I: Models, tasks, and complexity
Frazzoli, Emilio; Bullo, Francesco; Cortes, Jorge; Martinez, Sonia
2007-01-01T23:59:59.000Z
E. Frazzoli, “On synchronous robotic networks Part II: Timeto control design for mobile robotic networks. Application2007 On Synchronous Robotic Networks—Part I: Models, Tasks,
Tensor products of AC* charges and AC Radon measures are not always AC* charges
Buczolich, Zoltán
Tensor products of AC* charges and AC Radon measures are not always AC* charges] the tensor problem was stated for the tensor product of AC* charges and the Lebesgue measure. Later W: non-absolute integrals, variational measure, tensor product. 1
Princeton, Max Planck Society launch new research center for...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Planck Society President Peter Gruss, and Consul General of the Federal Republic of Germany in New York Busso von Alvensleben meet to sign an agreement launching the new Max...
Centerfor Genome Bas Max Planck Institute for Molecular Genetics
Spang, Rainer
Be rlin Centerfor Genome Bas ed Bioinform a tics Max Planck Institute for Molecular Genetics109/209 and 01GR0455 of the German Federal Ministry of Education and Research. In addition X
Centerfor Genome Bas Max Planck Institute for Molecular Genetics
Spang, Rainer
Be rlin Centerfor Genome Bas ed Bioinform a tics Max Planck Institute for Molecular Genetics of Education. 2 #12;Chapter 2 Implemented functions 2.1 twilight.pval: Testing effect sizes twilight
Phase Synchronization between Two Superradiant Lasers
Joshua M. Weiner; Kevin C. Cox; Justin G. Bohnet; James K. Thompson
2015-03-22T23:59:59.000Z
We experimentally demonstrate synchronization between two distinct ensembles of cold atoms undergoing steady state superradiance within a single longitudinal and transverse mode of the same optical cavity. The synchronization process is studied first in terms of the time dynamics of re-synchronization when the phase alignment of the two oscillators is abruptly broken. We also observe the steady state behavior of the lasers as their relative frequency is continuously varied. This system has the potential to realize a non-equilibrium quantum phase transition and could inform future implementations of milliHertz linewidth lasers.
Synchronization System for Next Generation Light Sources
Zavriyev, Anton
2014-03-27T23:59:59.000Z
An alternative synchronization technique – one that would allow explicit control of the pulse train including its repetition rate and delay is clearly desired. We propose such a scheme. Our method is based on optical interferometry and permits synchronization of the pulse trains generated by two independent mode-locked lasers. As the next generation x-ray sources will be driven by a clock signal derived from a mode-locked optical source, our technique will provide a way to synchronize x-ray probe with the optical pump pulses.
Synthesis for Logical Initializability of Synchronous Finite State Machines \\Lambda
Synthesis for Logical Initializability of Synchronous Finite State Machines \\Lambda Montek Singh is introduced for the synthesis for logical initializability of synchronous state machines. The goal that initializes the state machine is called its synchronizing sequence or initialization sequence. A synchronizing
LINEAR-PROGRAMMING DESIGN AND ANALYSIS OF FAST ALGORITHMS FOR MAX 2-CSP
Scott, Alexander Alexander
LINEAR-PROGRAMMING DESIGN AND ANALYSIS OF FAST ALGORITHMS FOR MAX 2-CSP ALEXANDER D. SCOTT AND GREGORY B. SORKIN Abstract. The class Max (r, 2)-CSP (or simply Max 2-CSP) consists of constraint(G) (13/75 + o(1))m, which gives a faster Max 2-CSP algorithm that uses exponential space: running in time
Design and analysis of modern three-phase AC/AC power converters for AC drives and utility interface
Kwak, Sangshin
2005-08-29T23:59:59.000Z
Significant advances in modern ac/ac power converter technologies and demands of industries have reached beyond standard ac/ac power converters with voltage-source inverters fed from diode rectifiers. Power electronics converters have been matured...
Clock synchronization for mobile ad hoc networks
Chandra, Rajan
2013-02-22T23:59:59.000Z
As mobile networking advances, there is a need for services such as clock synchronization that improve performance and support the development of higher-level applications. This can be achieved by adapting existing algorithms (such as the Network...
Improved Gene Targeting through Cell Cycle Synchronization
Tsakraklides, Vasiliki
Gene targeting is a challenge in organisms where non-homologous end-joining is the predominant form of recombination. We show that cell division cycle synchronization can be applied to significantly increase the rate of ...
Protection and Synchronization in Actor Systems
Hewitt, Carl
This paper presents a unified method [called ENCASING] for dealing with the closely related issues of synchronization and protection in actor systems [Hewitt et al. 1973a, 1973b, 1974a; Greif and Hewitt 1975]. Actors are ...
Opportunistic, collaborative and synchronized, proximal device ecology
Toledano, Eyal
2013-01-01T23:59:59.000Z
CoSync is an on-device software framework for coordinating proximal consumer electronic devices in order to create a synchronized, opportunistic and collaborative device ecology. The CoSync device ecology combines multiple ...
Robust Clock Synchronization in Wireless Sensor Networks
Saibua, Sawin
2010-10-12T23:59:59.000Z
Clock synchronization between any two nodes in a Wireless Sensor Network (WSNs) is generally accomplished through exchanging messages and adjusting clock offset and skew parameters of each node’s clock. To cope with unknown network message delays...
A microfluidic “baby machine” for cell synchronization
Shaw, Josephine
Common techniques used to synchronize eukaryotic cells in the cell cycle often impose metabolic stress on the cells or physically select for size rather than age. To address these deficiencies, a minimally perturbing method ...
Robust Clock Synchronization in Wireless Sensor Networks
Saibua, Sawin
2010-10-12T23:59:59.000Z
Clock synchronization between any two nodes in a Wireless Sensor Network (WSNs) is generally accomplished through exchanging messages and adjusting clock offset and skew parameters of each node’s clock. To cope with unknown network message delays...
Adaptive synchronization of coupled chaotic oscillators
Bhargava Ravoori; Adam B. Cohen; Anurag V. Setty; Francesco Sorrentino; Thomas E. Murphy; Edward Ott; Rajarshi Roy
2009-10-05T23:59:59.000Z
We experimentally demonstrate and numerically simulate a new adaptive method to maintain synchronization between coupled nonlinear chaotic oscillators, when the coupling between the systems is unknown and time-varying (e.g., due to environmental parameter drift). The technique is applied to optoelectronic feedback loops exhibiting high dimensional chaotic dynamics. In addition to keeping the two systems isochronally synchronized in the presence of a priori unknown time-varying coupling strength, the technique provides an estimate of the time-varying coupling.
Synchronization in a semiclassical Kuramoto model
Ignacio Hermoso de Mendoza; Leonardo A. Pachón; Jesús Gómez-Gardeńes; David Zueco
2014-11-10T23:59:59.000Z
Synchronization is a ubiquitous phenomenon occurring in social, biological, and technological systems when the internal rhythms of their constituents are adapted to be in unison as a result of their coupling. This natural tendency towards dynamical consensus has spurred a large body of theoretical and experimental research in recent decades. The Kuramoto model constitutes the most studied and paradigmatic framework in which to study synchronization. In particular, it shows how synchronization appears as a phase transition from a dynamically disordered state at some critical value for the coupling strength between the interacting units. The critical properties of the synchronization transition of this model have been widely studied and many variants of its formulations have been considered to address different physical realizations. However, the Kuramoto model has been studied only within the domain of classical dynamics, thus neglecting its applications for the study of quantum synchronization phenomena. Based on a system-bath approach and within the Feynman path-integral formalism, we derive equations for the Kuramoto model by taking into account the first quantum fluctuations. We also analyze its critical properties, the main result being the derivation of the value for the synchronization onset. This critical coupling increases its value as quantumness increases, as a consequence of the possibility of tunneling that quantum fluctuations provide.
Max-Plus Stochastic Control and Risk-Sensitivity
Fleming, Wendell H., E-mail: whf@dam.brown.ed [Brown University, Division of Applied Mathematics and Lefschetz Center for Dynamical Systems (United States); Kaise, Hidehiro, E-mail: kaise@is.nagoya-u.ac.j [Nagoya University, Graduate School of Information Science (Japan); Sheu, Shuenn-Jyi, E-mail: sheusj@math.sinica.edu.t [Academia Sinica, Institute of Mathematics (China)
2010-08-15T23:59:59.000Z
In the Maslov idempotent probability calculus, expectations of random variables are defined so as to be linear with respect to max-plus addition and scalar multiplication. This paper considers control problems in which the objective is to minimize the max-plus expectation of some max-plus additive running cost. Such problems arise naturally as limits of some types of risk sensitive stochastic control problems. The value function is a viscosity solution to a quasivariational inequality (QVI) of dynamic programming. Equivalence of this QVI to a nonlinear parabolic PDE with discontinuous Hamiltonian is used to prove a comparison theorem for viscosity sub- and super-solutions. An example from mathematical finance is given, and an application in nonlinear H-infinity control is sketched.
Synchronized vehicle motion recording and playback
-Rec: Battery and hard disk 25/06/2014 (c) 2014 - Max Planck Institute for Biological Cybernetics 10 · Large battery: Longex 12LC-150 12V 160Ah ~4-5 hours operation · Small battery: VARTA LAD85 12V 85-Rec: Data flow INS Video Audio RAW INS files RAW Video files start/stop/reset warnings/errors RECORDING
Anomalous synchronization threshold in coupled logistic maps
C. Anteneodo; A. M. Batista; R. L. Viana
2005-04-05T23:59:59.000Z
We consider regular lattices of coupled chaotic maps. Depending on lattice size, there may exist a window in parameter space where complete synchronization is eventually attained after a transient regime. Close outside this window, an intermittent transition to synchronization occurs. While asymptotic transversal Lyapunov exponents allow to determine the synchronization threshold, the distribution of finite-time Lyapunov exponents, in the vicinity of the critical frontier, is expected to provide relevant information on phenomena such as intermittency. In this work we scrutinize the distribution of finite-time exponents when the local dynamics is ruled by the logistic map $x \\mapsto 4x(1-x)$. We obtain a theoretical estimate for the distribution of finite-time exponents, that is markedly non-Gaussian. The existence of correlations, that spoil the central limit approximation, is shown to modify the typical intermittent bursting behavior. The present scenario could apply to a wider class of systems with different local dynamics and coupling schemes.
Synchronous Characterization of Semiconductor Microcavity Laser Beam
Wang, Tao
2015-01-01T23:59:59.000Z
We report on a high-resolution double-channel imaging method used to synchronously map the intensity- and optical-frequency-distribution of a laser beam in the plane orthogonal to the propagation direction. The synchronous measurement allows us to show that the laser frequency is an inhomogeneous distribution below threshold, but that it becomes homogeneous across the fundamental Gaussian mode above threshold. The beam's tails deviations from the Gaussian shape, however, are accompanied by sizeable fluctuations in the laser wavelength, possibly deriving from manufacturing details and from the influence of spontaneous emission in the very low intensity wings. In addition to the synchronous spatial characterization, a temporal analysis at any given point in the beam cross-section is carried out. Using this method, the beam homogeneity and spatial shape, energy density, energy center and the defects-related spectrum can also be extracted from these high-resolution pictures.
The Scheme of Beam Synchronization in MEIC
Zhang, Yuhong; Derbenev, Yaroslav S.; Hutton, Andrew M.
2013-06-01T23:59:59.000Z
Synchronizing colliding beams at single or multiple collision points is a critical R&D issue in the design of a medium energy electron-ion collider (MEIC) at Jefferson Lab. The path-length variation due to changes in the ion energy, which varies over 20 to 100 GeV, could be more than several times the bunch spacing. The scheme adopted in the present MEIC baseline is centered on varying the number of bunches (i.e., harmonic number) stored in the collider ring. This could provide a set of discrete energies for proton or ions such that the beam synchronization condition is satisfied. To cover the ion energy between these synchronized values, we further propose to vary simultaneously the electron ring circumference and the frequency of the RF systems in both collider rings. We also present in this paper the requirement of frequency tunability of SRF cavities to support the scheme.
A reply to "Quantum Clock Synchronization"
Eric Burt; Chris Ekstrom; Tom Swanson
2000-07-11T23:59:59.000Z
Recently a protocol for Quantum Clock Synchronization (QCS) of remote clocks using quantum entanglement was proposed by Jozsa et al. This method has the goal of eliminating the random noise present in classical synchronization techniques. However, as stated QCS depends on the two members of each entangled pair undergoing the same unitary evolution even while being transported to different locations. This is essentially equivalent to a perfect Eddington Slow Clock Transfer protocol and thus, not an improvement over classical techniques. We will discuss this and suggest ways in which QCS may still be used.
Efficient dynamic synchronous machine simulation with harmonics
Haskew, T.A.; Stern, H.P.; Chen, Z. [Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Electrical Engineering] [Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Electrical Engineering
1996-06-01T23:59:59.000Z
Within this paper, an efficient procedure for the dynamic simulation of faulted synchronous machines operating in the presence of harmonics is presented. The algorithm employs steady-state frequency domain techniques for simulation of the transmission system sequence networks and time domain methods for the synchronous machines represented in the odq frame of reference. The procedure affords greater accuracy than conventional fault analysis techniques based strictly on steady-state methods, yet requires far less computational time than full system dynamic simulations such as those using the EMTP.
On the Synchronization of Networks with Prescribed Degree Distributions
Jost, Jürgen
On the Synchronization of Networks with Prescribed Degree Distributions Fatihcan M. Atay T for building non-synchronizing networks having a prescribed degree distribution. Index Terms distribution, which converges to a Poisson distribution for large network sizes. The degree distribution
Complete chaotic synchronization in mutually coupled time-delay systems
Alexandra S. Landsman; Ira B. Schwartz
2007-10-25T23:59:59.000Z
Complete chaotic synchronization of end lasers has been observed in a line of mutually coupled, time-delayed system of three lasers, with no direct communication between the end lasers. The present paper uses ideas from generalized synchronization to explain the complete synchronization in the presence of long coupling delays, applied to a model of mutually coupled semiconductor lasers in a line. These ideas significantly simplify the analysis by casting the stability in terms of the local dynamics of each laser. The variational equations near the synchronization manifold are analyzed, and used to derive the synchronization condition that is a function of the parameters. The results explain and predict the dependence of synchronization on various parameters, such as time-delays, strength of coupling and dissipation. The ideas can be applied to understand complete synchronization in other chaotic systems with coupling delays and no direct communication between synchronized sub-systems.
Self-stabilizing clock phase synchronization in a distributed ring
Pancholi, Alok
1994-01-01T23:59:59.000Z
case synchronization time of the algortihm is [ ] pulses, where n is the size of the ring. Finally, this tecnique is extended to achieve synchronization of 2i-phase clocks or events....
New approach to the fault location problem using synchronized sampling
Mrkic, Jasna
1994-01-01T23:59:59.000Z
This thesis presents a new approach to solving the problem of fault location on a transmission line using synchronized data from both ends of the line. The synchronized phase voltage and current samples taken during the fault transient are used...
Synchronous Machine Modeling Notes2 1.0 Inductances
McCalley, James D.
Synchronous Machine Modeling Notes2 1.0 Inductances Recall the relation between flux linkages. Rather, for each coil and coil pair in the synchronous machine, we are going to see if any of the terms
Modular Composition of Synchronous Programs: Applications to Traffic Signal Control
Zennaro, Marco; Sengupta, Raja
2006-01-01T23:59:59.000Z
Synchronous Programs Figure 9: The model used to estimate the overhead 512 Mb ram machines.machines. Hence, we argue that we can distribute a Simulink-like synchronous
Quantum Algorithms for Evaluating MIN-MAX Trees
Richard Cleve; Dmitry Gavinsky; David L. Yeung
2007-10-31T23:59:59.000Z
We present a bounded-error quantum algorithm for evaluating Min-Max trees. For a tree of size N our algorithm makes N^{1/2+o(1)} comparison queries, which is close to the optimal complexity for this problem.
Curriculum Vitae Arne Max Erich Winguth, Ph.D.
Winguth, Arne
in an earth system model", two months summer salary, 2005. [9] Visiting Scientist, Max Planck Institute for Meteorology, Germany, "Development of marine carbon cycle in an earth system model", two months summer salary of marine carbon cycle in an earth system model", two months summer salary, 2003. [12] University
Guidelines for Residential Commissioning Craig Wray, Iain Walker, Max Sherman
LBNL-48767 Guidelines for Residential Commissioning Craig Wray, Iain Walker, Max Sherman Berkeley, CA 94720 January 2003 This report describes work supported by the California Energy Commission-76SF00098. This report was prepared as a result of work sponsored by the California Energy Commission
Water Quality for Livestock Max Irsik DVM, MAB
Watson, Craig A.
Water Quality for Livestock Max Irsik DVM, MAB Beef Cattle Extension Veterinarian University of Florida College of Veterinary Medicine Water is an essential nutrient for humans and livestock and drinking water is the primary source of water for most cattle. The most important aspect of water
Paradigmes objets et synchrones dans les systmes temps-rel
AndrĂ©, Charles
les objets synchrones de F. Boulanger et les machines d'exĂ©cution pour langages synchrones. Les SyncParadigmes objets et synchrones dans les systĂ¨mes temps-rĂ©el Charles ANDRĂ? Laboratoire I3S'Ă©quipe SPORTS (Synchronous Programming Of Real-Time Systems) s'intĂ©resse Ă la conception de systĂ¨mes rĂ©actifs
Regulation and controlled synchronization for complex dynamical systems
Eindhoven, Technische Universiteit
Regulation and controlled synchronization for complex dynamical systems H.J.C. Huijberts #3; H of controlled synchronization as a regulator problem. In controlled synchronization one is given autonomous of the problem where the standard solvability assumptions for the regulator problem are not met turn out to have
Synthesis for Logical Initializability of Synchronous Finite State Machines
Synthesis for Logical Initializability of Synchronous Finite State Machines Montek Singh Steven M for the synthesis for logical initializability of synchronous state machines. The goal is to synthesize a gate to physically reset machines if they get out of synchronism. Furthermore, a form of initializability called
Software Synthesis from Synchronous Specifications Using Logic Simulation Techniques
Brayton, Robert K.
a synchronous state machine specification for em- bedded control systems. The framework is generic enoughSoftware Synthesis from Synchronous Specifications Using Logic Simulation Techniques Yunjian Jiang variables. This model has been studied for system design and verification. High-level synchronous languages
EXECUTION MACHINE FOR SYNCHRONOUS LANGUAGES Charles ANDR Hdi BOUFAED
AndrĂ©, Charles
EXECUTION MACHINE FOR SYNCHRONOUS LANGUAGES Charles ANDRĂ? HĂ©di BOUFAĂŹED Laboratoire I3S, UniversitĂ© on a the synchronous paradigm, and explains the role and the architecture of the execution machine. Keywords: synchronous programming, execution machine, control, implementation. NOMENCLATURE We use Courier as the font
Identification and Tracking of Parameters for a Large Synchronous Generator
was to describe a method to identify synchronous machine parame- ters from on-line measurements and to develop of Contents Section Page 1 Introduction 1 2 Modeling synchronous machines 2 3 State estimation and the MooreIdentification and Tracking of Parameters for a Large Synchronous Generator Final Project Report
Synchronized bursts following instability of synchronous spiking in chaotic neuronal networks
Mikhail V. Ivanchenko; Grigory V. Osipov; Vladimir D. Shalfeev; Jurgen Kurths
2006-01-11T23:59:59.000Z
We report on the origin of synchronized bursting dynamics in various networks of neural spiking oscillators, when a certain threshold in coupling strength is exceeded. These ensembles synchronize at relatively low coupling strength and lose synchronization at stronger coupling via spatio-temporal intermittency. The latter transition triggers multiple-timescale dynamics, which results in synchronized bursting with a fractal-like spatio-temporal pattern of spiking. Implementation of an appropriate technique of separating oscillations on different time-scales allows for quantitative analysis of this phenomenon. We show, that this phenomenon is generic for various network topologies from regular to small-world and scale-free ones and for different types of coupling.
Collective Almost Synchronization in Complex Networks
M. S. Baptista; Hai-Peng Ren; J. C. M. Swarts; R. Carareto; H. Nijmeijer; C. Grebogi
2012-04-09T23:59:59.000Z
This work introduces the phenomenon of Collective Almost Synchronization (CAS), which describes a universal way of how patterns can appear in complex networks even for small coupling strengths. The CAS phenomenon appears due to the existence of an approximately constant local mean field and is characterized by having nodes with trajectories evolving around periodic stable orbits. Common notion based on statistical knowledge would lead one to interpret the appearance of a local constant mean field as a consequence of the fact that the behavior of each node is not correlated to the behaviors of the others. Contrary to this common notion, we show that various well known weaker forms of synchronization (almost, time-lag, phase synchronization, and generalized synchronization) appear as a result of the onset of an almost constant local mean field. If the memory is formed in a brain by minimising the coupling strength among neurons and maximising the number of possible patterns, then the CAS phenomenon is a plausible explanation for it.
Title of dissertation: SYNCHRONIZATION IN CHAOTIC SYSTEMS
Anlage, Steven
ABSTRACT Title of dissertation: SYNCHRONIZATION IN CHAOTIC SYSTEMS: COUPLING OF CHAOTIC MAPS, DATA ASSIMILATION, AND WEATHER FORECASTING Seung-Jong Baek, Doctor of Philosophy, 2007 Dissertation directed by ASSIMILATION, AND WEATHER FORECASTING by Seung-Jong Baek Dissertation submitted to the Faculty of the Graduate
Clock synchronization for mobile ad hoc networks
Chandra, Rajan
2013-02-22T23:59:59.000Z
Time Protocol) used in wired networks (e.g. Internet) to Mobile Ad Hoc Networks (MANets). It may also be achieved by developing other algorithms that achieve clock synchronization and may be suitable for MANets. Using the Network Time Protocol (NTP...
Synchronous Machines 1.0 Introduction
McCalley, James D.
% of the MW in most power systems; · Provide frequency regulation and load following; · Are the main source of energy (steam, water, wind) into mechanical energy, as illustrated in Fig. 1 [1]. Fig. 1 [1] PDF created the induced voltage in the armature (stator) windings is synchronized with (has same frequency as) the network
Generation and Synchronous TreeAdjoining Grammars
Shieber, Stuart
Generation and Synchronous TreeAdjoining Grammars Stuart M. Shieber Yves Schabes Aiken Computation) have been proposed as a formal ism for generation based on the intuition that the extended domain serving as an aid to generation from semantic representations. We demonstrate that this intuition can
Synchronous Machine Modeling 1.0 Introduction
McCalley, James D.
windings There are 5 physical windings on a synchronous generator. · The 3 stator (phase) windings, denoted and all rotor winding circuits are symmetrical with respect to the polar and inter-polar (between a, b, c. · The main field winding, denoted F. · So-called "amortessuer" (dead) windings exist
Synchronization and entrainment of coupled circadian oscillators
Toral, Raúl
Synchronization and entrainment of coupled circadian oscillators N. Komin, A. C. Murza, E. Herna- ciently entrained by the 24 h lightdark cycle. Most of the studies carried out so far emphasize oscillators being more entrainable by the external forcing than the self-oscillating neurons with different
The Wireless Synchronization Problem Shlomi Dolev
Lynch, Nancy
The Wireless Synchronization Problem Shlomi Dolev Ben-Gurion University Beer-Sheva, Israel dolev Newport MIT CSAIL Cambridge, MA, USA cnewport@csail.mit.edu ABSTRACT In this paper, we study the wireless-1-60558-396-9/09/08 ...$10.00. Categories and Subject Descriptors C.2.1 [Network Architecture and Design]: Wireless Net
Electronic circuit implementation of chaos synchronization
Ravi Ranjan; Shivshankar Mishra; Suneel Madhekar
2012-07-20T23:59:59.000Z
In this paper, an electronic circuit implementation of a robustly chaotic two-dimensional map is presented. Two such electronic circuits are realized. One of the circuits is configured as the driver and the other circuit is configured as the driven system. Synchronization of chaos between the driver and the driven system is demonstrated.
Synchronous Machines 1.0 Introduction
McCalley, James D.
of energy (steam, water, wind) into mechanical energy, as illustrated in Fig. 1 [1]. Fig. 1 [1] PDF created is the most important component in the power system, since synchronous generators · Are the source of 99% of the MW in most power systems; · Provide frequency regulation and load following; · Are the main source
Iron loss calculation for synchronous reluctance machines
Leonardi, F.; Matsuo, T.; Lipo, T.A. [Univ. of Wisconsin, Madison, WI (United States)
1995-12-31T23:59:59.000Z
A numerical method for iron loss calculation is presented in this paper. The method is suitable for any synchronous and most dc machines, especially if the current waveforms are known a priori . This technique will be principally useful for high speed machines and in particular for the synchronous reluctance machines and in particular for the synchronous reluctance machine, where the iron losses are often an important issue. The calculation is based on Finite Element Analysis, which provides the flux density waveforms in the iron, and on the Fourier Analysis of these waveforms. Several Finite Element Simulations are necessary to obtain the induced voltage versus time waveforms. To reduce the post-processing time the majority of the elements of the model are grouped together to create super elements. Also the periodicity of the motor can be used to reduce the number of required simulations. The method is applied to the calculation of the iron losses of a synchronous reluctance generator, and a number of interesting results are discussed in the paper.
Simulation of Synchronous Machines This chapter covers
McCalley, James D.
1 Simulation of Synchronous Machines This chapter covers: (A) Sections 5.25.7: Determination of initial conditions (B) Section 5.8: Determination of machine parameters from manufacturers' data.3: Machine connected to an infinite bus through a line · Section 5.4: Machine connected
Gradient Clock Synchronization in Wireless Sensor Networks
Gradient Clock Synchronization in Wireless Sensor Networks Philipp Sommer Computer Engineering- olution. Without doubt, time is a first-class citizen in wireless sensor networks. Without accurate time if the nodes in the wireless sensor network manage to have an adequate agreement of time. Indeed
System-level Max Power (SYMPO) -A Systematic Approach for Escalating System-level Power Consumption
John, Lizy Kurian
System-level Max Power (SYMPO) - A Systematic Approach for Escalating System-level Power a computer system for the worst case power consumption scenario, system architects often use hand-crafted max SYMPO, an automatic SYstem level Max POwer virus generation framework, which maximizes the power
Sugar++: A SAT-Based MAX-CSP/COP Solver Tomoya Tanjo1
Banbara, Mutsunori
Sugar++: A SAT-Based MAX-CSP/COP Solver Tomoya Tanjo1 , Naoyuki Tamura2 , and Mutsunori Banbara2 1 describes some features of Sugar++, a SAT-based MAX- CSP/COP solver entering the Third International CSP Solver Competition. In our approach, a MAX-CSP is translated into a Constraint Optimization Problem (COP
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a gHigh4-FD-a < RAPIDâ€Žcommunication facilities |AAON Jump to: navigation,ACORE Jump to:ACS Jump
Broader source: Energy.gov [DOE]
7AC Technologies, based in Woburn, Massachusetts, is developing Liquid Desiccant HVAC systems for Commercial and Industrial buildings using technology from the National Renewable Energy Laboratory. These Liquid Desiccant HVAC systems deliver a 50 to 75 percent reduction in energy usage over conventional HVAC units. The system consists of a membrane conditioner responsible for drying and cooling the air and a heat-driven regenerator. The liquid desiccant design allows for the utilization of solar or waste heat sources, paving the way for net-zero energy retrofits to existing buildings with costs comparable to conventional HVAC.
System and method for time synchronization in a wireless network
Gonia, Patrick S. (Maplewood, MN); Kolavennu, Soumitri N. (Blaine, MN); Mahasenan, Arun V. (Kerala, IN); Budampati, Ramakrishna S. (Maple Grove, MN)
2010-03-30T23:59:59.000Z
A system includes multiple wireless nodes forming a cluster in a wireless network, where each wireless node is configured to communicate and exchange data wirelessly based on a clock. One of the wireless nodes is configured to operate as a cluster master. Each of the other wireless nodes is configured to (i) receive time synchronization information from a parent node, (ii) adjust its clock based on the received time synchronization information, and (iii) broadcast time synchronization information based on the time synchronization information received by that wireless node. The time synchronization information received by each of the other wireless nodes is based on time synchronization information provided by the cluster master so that the other wireless nodes substantially synchronize their clocks with the clock of the cluster master.
AC Resistance measuring instrument
Hof, Peter J. (Richland, WA)
1983-01-01T23:59:59.000Z
An auto-ranging AC resistance measuring instrument for remote measurement of the resistance of an electrical device or circuit connected to the instrument includes a signal generator which generates an AC excitation signal for application to a load, including the device and the transmission line, a monitoring circuit which provides a digitally encoded signal representing the voltage across the load, and a microprocessor which operates under program control to provide an auto-ranging function by which range resistance is connected in circuit with the load to limit the load voltage to an acceptable range for the instrument, and an auto-compensating function by which compensating capacitance is connected in shunt with the range resistance to compensate for the effects of line capacitance. After the auto-ranging and auto-compensation functions are complete, the microprocessor calculates the resistance of the load from the selected range resistance, the excitation signal, and the load voltage signal, and displays of the measured resistance on a digital display of the instrument.
AC resistance measuring instrument
Hof, P.J.
1983-10-04T23:59:59.000Z
An auto-ranging AC resistance measuring instrument for remote measurement of the resistance of an electrical device or circuit connected to the instrument includes a signal generator which generates an AC excitation signal for application to a load, including the device and the transmission line, a monitoring circuit which provides a digitally encoded signal representing the voltage across the load, and a microprocessor which operates under program control to provide an auto-ranging function by which range resistance is connected in circuit with the load to limit the load voltage to an acceptable range for the instrument, and an auto-compensating function by which compensating capacitance is connected in shunt with the range resistance to compensate for the effects of line capacitance. After the auto-ranging and auto-compensation functions are complete, the microprocessor calculates the resistance of the load from the selected range resistance, the excitation signal, and the load voltage signal, and displays of the measured resistance on a digital display of the instrument. 8 figs.
Ryu, S.K.; Kim, Y.K.; Kim, M.K.; Won, S.H. [School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742 (Korea); Chung, S.H. [Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal (Saudi Arabia)
2010-01-15T23:59:59.000Z
The oscillation behavior of laminar lifted flames under the influence of low-frequency AC has been investigated experimentally in coflow jets. Various oscillation modes were existed depending on jet velocity and the voltage and frequency of AC, especially when the AC frequency was typically smaller than 30 Hz. Three different oscillation modes were observed: (1) large-scale oscillation with the oscillation frequency of about 0.1 Hz, which was independent of the applied AC frequency, (2) small-scale oscillation synchronized to the applied AC frequency, and (3) doubly-periodic oscillation with small-scale oscillation embedded in large-scale oscillation. As the AC frequency decreased from 30 Hz, the oscillation modes were in the order of the large-scale oscillation, doubly-periodic oscillation, and small-scale oscillation. The onset of the oscillation for the AC frequency smaller than 30 Hz was in close agreement with the delay time scale for the ionic wind effect to occur, that is, the collision response time. Frequency-doubling behavior for the small-scale oscillation has also been observed. Possible mechanisms for the large-scale oscillation and the frequency-doubling behavior have been discussed, although the detailed understanding of the underlying mechanisms will be a future study. (author)
Synchronous and Cogged Fan Belt Performance Assessment
Cutler, D.; Dean, J.; Acosta, J.
2014-02-01T23:59:59.000Z
The GSA Regional GPG Team commissioned the National Renewable Energy Laboratory (NREL) to perform monitoring of cogged V-belts and synchronous belts on both a constant volume and a variable air volume fan at the Byron G. Rodgers Federal Building and U.S. Courthouse in Denver, Colorado. These motor/fan combinations were tested with their original, standard V-belts (appropriately tensioned by an operation and maintenance professional) to obtain a baseline for standard operation. They were then switched to the cogged V-belts, and finally to synchronous belts. The power consumption by the motor was normalized for both fan speed and air density changes. This was necessary to ensure that the power readings were not influenced by a change in rotational fan speed or by the power required to push denser air. Finally, energy savings and operation and maintenance savings were compiled into an economic life-cycle cost analysis of the different belt options.
Pursuit and Synchronization in Hydrodynamic Dipoles
Kanso, Eva
2015-01-01T23:59:59.000Z
We study theoretically the behavior of a class of hydrodynamic dipoles. This study is motivated by recent experiments on synthetic and biological swimmers in microfluidic \\textit{Hele-Shaw} type geometries. Under such confinement, a swimmer's hydrodynamic signature is that of a potential source dipole, and the long-range interactions among swimmers are obtained from the superposition of dipole singularities. Here, we recall the equations governing the positions and orientations of interacting asymmetric swimmers in doubly-periodic domains, and focus on the dynamics of swimmer pairs. We obtain two families of `relative equilibria'-type solutions that correspond to pursuit and synchronization of the two swimmers, respectively. Interestingly, the pursuit mode is stable for large tail swimmers whereas the synchronization mode is stable for large head swimmers. These results have profound implications on the collective behavior reported in several recent studies on populations of confined microswimmers.
Phase synchronization of instrumental music signals
Sayan Mukherjee; Sanjay Kumar Palit; Santo Banerjee; MRK Ariffin; D. K. Bhattacharya
2014-09-04T23:59:59.000Z
Signal analysis is one of the finest scientific techniques in communication theory. Some quantitative and qualitative measures describe the pattern of a music signal, vary from one to another. Same musical recital, when played by different instrumentalists, generates different types of music patterns. The reason behind various patterns is the psychoacoustic measures - Dynamics, Timber, Tonality and Rhythm, varies in each time. However, the psycho-acoustic study of the music signals does not reveal any idea about the similarity between the signals. For such cases, study of synchronization of long-term nonlinear dynamics may provide effective results. In this context, phase synchronization (PS) is one of the measures to show synchronization between two non-identical signals. In fact, it is very critical to investigate any other kind of synchronization for experimental condition, because those are completely non identical signals. Also, there exists equivalence between the phases and the distances of the diagonal line in Recurrence plot (RP) of the signals, which is quantifiable by the recurrence quantification measure tau-recurrence rate. This paper considers two nonlinear music signals based on same raga played by two eminent sitar instrumentalists as two non-identical sources. The psycho-acoustic study shows how the Dynamics, Timber, Tonality and Rhythm vary for the two music signals. Then, long term analysis in the form of phase space reconstruction is performed, which reveals the chaotic phase spaces for both the signals. From the RP of both the phase spaces, tau-recurrence rate is calculated. Finally by the correlation of normalized tau-recurrence rate of their 3D phase spaces and the PS of the two music signals has been established. The numerical results well support the analysis.
Clock Auto-synchronizing Method for BES III ETOF Upgrade
Si-Yu, Wang; Shu-Bin, Liu; Qi, An
2015-01-01T23:59:59.000Z
An automatic clock synchronizing method implemented in field programmable gate array (FPGA) is proposed in this paper. It is developed for the clock system which will be applied in the end-cap time of flight (ETOF) upgrade of the Beijing Spectrometer (BESIII). In this design, an FPGA is used to automatically monitor the synchronization circuit and deal with signals coming from external clock synchronization circuit. By testing different delay time of the detection signal and analyzing state signals returned, the synchronization windows will be found automatically in FPGA. The new clock system not only retains low clock jitter which is less than 20ps root mean square (RMS), but also demonstrates automatic synchronization to the beam bunches. So far, the clock auto-synchronizing function has been working successfully under a series of tests. It will greatly simplify the system initialization and maintenance in the future.
Clock Auto-synchronizing Method for BES III ETOF Upgrade
Wang Si-Yu; Cao Ping; Liu Shu-Bin; An Qi
2015-03-09T23:59:59.000Z
An automatic clock synchronizing method implemented in field programmable gate array (FPGA) is proposed in this paper. It is developed for the clock system which will be applied in the end-cap time of flight (ETOF) upgrade of the Beijing Spectrometer (BESIII). In this design, an FPGA is used to automatically monitor the synchronization circuit and deal with signals coming from external clock synchronization circuit. By testing different delay time of the detection signal and analyzing state signals returned, the synchronization windows will be found automatically in FPGA. The new clock system not only retains low clock jitter which is less than 20ps root mean square (RMS), but also demonstrates automatic synchronization to the beam bunches. So far, the clock auto-synchronizing function has been working successfully under a series of tests. It will greatly simplify the system initialization and maintenance in the future.
Efficient synchronization of structurally adaptive coupled Hindmarsh-Rose neurons
A. Moujahid; A. d'Anjou; F. J. Torrealdea
2012-03-05T23:59:59.000Z
The use of spikes to carry information between brain areas implies complete or partial synchronization of the neurons involved. The degree of synchronization reached by two coupled systems and the energy cost of maintaining their synchronized behaviour is highly dependent on the nature of the systems. For non-identical systems the maintenance of a synchronized regime is energetically a costly process. In this work, we study conditions under which two non-identical electrically coupled neurons can reach an efficient regime of synchronization at low energy cost. We show that the energy consumption required to keep the synchronized regime can be spontaneously reduced if the receiving neuron has adaptive mechanisms able to bring its biological parameters closer in value to the corresponding ones in the sending neuron.
Generalized chaotic synchronization in coupled Ginzburg-Landau equations
Koronovskii, A. A., E-mail: alkor@nonlin.sgu.ru; Popov, P. V., E-mail: popovpv@nonlin.sgu.ru; Hramov, A. E. [Saratov State University (Russian Federation)], E-mail: aeh@nonlin.sgu.ru
2006-10-15T23:59:59.000Z
Generalized synchronization is analyzed in unidirectionally coupled oscillatory systems exhibiting spatiotemporal chaotic behavior described by Ginzburg-Landau equations. Several types of coupling between the systems are analyzed. The largest spatial Lyapunov exponent is proposed as a new characteristic of the state of a distributed system, and its calculation is described for a distributed oscillatory system. Partial generalized synchronization is introduced as a new type of chaotic synchronization in spatially nonuniform distributed systems. The physical mechanisms responsible for the onset of generalized chaotic synchronization in spatially distributed oscillatory systems are elucidated. It is shown that the onset of generalized chaotic synchronization is described by a modified Ginzburg-Landau equation with additional dissipation irrespective of the type of coupling. The effect of noise on the onset of a generalized synchronization regime in coupled distributed systems is analyzed.
Chaos synchronization in long-range coupled map lattices
C. Anteneodo; A. M. Batista; R. L. Viana
2004-01-22T23:59:59.000Z
We investigate the synchronization phenomenon in coupled chaotic map lattices where the couplings decay with distance following a power-law. Depending on the lattice size, the coupling strength and the range of the interactions, complete chaos synchronization may be attained. The synchronization domain in parameter space can be analytically delimited by means of the condition of negativity of the largest transversal Lyapunov exponent. Here we analyze in detail the role of all the system parameters in the ability of the lattice to achieve complete synchronization, testing analytical results with the outcomes of numerical experiments.
Design and control of noise-induced synchronization patterns
Wataru Kurebayashi; Tsubasa Ishii; Mikio Hasegawa; Hiroya Nakao
2015-02-17T23:59:59.000Z
We propose a method for controlling synchronization patterns of limit-cycle oscillators by common noisy inputs, i.e., by utilizing noise-induced synchronization. Various synchronization patterns, including fully synchronized and clustered states, can be realized by using linear filters that generate appropriate common noisy signals from given noise. The optimal linear filter can be determined from the linear phase response property of the oscillators and the power spectrum of the given noise. The validity of the proposed method is confirmed by numerical simulations.
Design and control of noise-induced synchronization patterns
Kurebayashi, Wataru; Hasegawa, Mikio; Nakao, Hiroya
2015-01-01T23:59:59.000Z
We propose a method for controlling synchronization patterns of limit-cycle oscillators by common noisy inputs, i.e., by utilizing noise-induced synchronization. Various synchronization patterns, including fully synchronized and clustered states, can be realized by using linear filters that generate appropriate common noisy signals from given noise. The optimal linear filter can be determined from the linear phase response property of the oscillators and the power spectrum of the given noise. The validity of the proposed method is confirmed by numerical simulations.
Symmetric Clock Synchronization in Sensor Networks Philipp Sommer
Symmetric Clock Synchronization in Sensor Networks Philipp Sommer Computer Engineering and Networks Laboratory ETH Zurich 8092 Zurich, Switzerland sommer@tik.ee.ethz.ch Roger Wattenhofer Computer Engineering
Cluster Explosive Synchronization in a Power Grid model
Ji, Peng; Menck, Peter J; Rodrigues, Francisco A; Kurths, Jürgen
2013-01-01T23:59:59.000Z
The emergence of explosive synchronization has been reported as an abrupt transition in complex networks of first-order Kuramoto oscillators. In this Letter, we demonstrate that the nodes in a power grid model, equivalent to a second-order Kuramoto model, perform a cascade of transitions toward a synchronous macroscopic state, a novel phenomenon that we call cluster explosive synchronization. We provide a rigorous analytical treatment using a mean-field analysis in uncorrelated networks. Our findings are in good agreement with numerical simulations and fundamentally deepen the understanding of microscopic mechanisms toward synchronization.
Hybrid function projective synchronization in complex dynamical networks
Wei, Qiang; Wang, Xing-yuan, E-mail: wangxy@dlut.edu.cn; Hu, Xiao-peng [Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian, 116024 (China)] [Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian, 116024 (China)
2014-02-15T23:59:59.000Z
This paper investigates hybrid function projective synchronization in complex dynamical networks. When the complex dynamical networks could be synchronized up to an equilibrium or periodic orbit, a hybrid feedback controller is designed to realize the different component of vector of node could be synchronized up to different desired scaling function in complex dynamical networks with time delay. Hybrid function projective synchronization (HFPS) in complex dynamical networks with constant delay and HFPS in complex dynamical networks with time-varying coupling delay are researched, respectively. Finally, the numerical simulations show the effectiveness of theoretical analysis.
SolarMax Technology Inc | Open Energy Information
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a g eWorks -09-0018-CXNuonYucheng Xinyuan Heat PowerSimploCells JumpSolar TrackerSolarEnergiaSolarMax
A multichannel, synchronous laser signal processing system
Hulse, William Colbern
1974-01-01T23:59:59.000Z
to the members of the Lidar Program staff, John Schell, Andrew Blanchard, and Homayoun Malek, and to the other members of the committee, Dr. V. T. Rhyne and Professor J. T. Kent for their help along the way. The author wishes to thank the typists, Mrs.... The Preliminary Specification Noise Considerations. Design Trade-Offs Final Design, Configuration and Operation ~Pa e 111 V1 V11 X1 XV 13 14 15 15 20 20 21 22 31 37 ~Ch t* The Synchronous Demodulator Introduction. A Preliminary...
Permanent-magnet-less synchronous reluctance system
Hsu, John S
2012-09-11T23:59:59.000Z
A permanent magnet-less synchronous system includes a stator that generates a magnetic revolving field when sourced by an alternating current. An uncluttered rotor is disposed within the magnetic revolving field and spaced apart from the stator to form an air gap relative to an axis of rotation. The rotor includes a plurality of rotor pole stacks having an inner periphery biased by single polarity of a north-pole field and a south-pole field, respectively. The outer periphery of each of the rotor pole stacks are biased by an alternating polarity.
On synchronous robotic networks - Part II: Time complexity of rendezvous and deployment algorithms
Frazzoli, Emilio; Bullo, Francesco; Cortes, Jorge; Martinez, Sonia
2007-01-01T23:59:59.000Z
et al. : SYNCHRONOUS ROBOTIC NETWORKS—PART II control andFrazzoli, “On synchronous robotic networks—Part I: Models,et al. : SYNCHRONOUS ROBOTIC NETWORKS—PART II links. ) We
Analytical Method of Torque Calculation for Interior Permanent Magnet Synchronous Machines
Tolbert, Leon M.
Analytical Method of Torque Calculation for Interior Permanent Magnet Synchronous Machines Seong (FEA). Also, this method can be applied to any type of synchronous machine. Index Terms-- equivalent circuit, inductance, permanent magnet machine, synchronous motors, torque. I. NOMENCLATURE BFE brushless
The Flooding Time Synchronization Protocol Mikls Marti Branislav Kusy Gyula Simon kos Ldeczi
Maróti, Miklós
The Flooding Time Synchronization Protocol Miklós Maróti Branislav Kusy Gyula Simon Ákos Lédeczi the Flooding Time Synchronization Protocol (FTSP), especially tailored for applications requiring stringent by utilizing periodic flooding of synchronization messages, and implicit dynamic topology update. The unique
a min-max regret robust optimization approach for large scale full ...
admin
2007-07-20T23:59:59.000Z
the full-factorial scenario design of data uncertainty. The proposed algorithm is shown to be efficient for solving large-scale min-max regret robust optimization ...
AVTA: Aerovironment AC Level 2 Charging System Testing Results...
Broader source: Energy.gov (indexed) [DOE]
Aerovironment AC Level 2 - February 2012 More Documents & Publications AVTA: Clipper Creek AC Level 2 Charging System Testing Results AVTA: Eaton AC Level 2 Charging System...
Min-max redundancy resolution for a mobile manipulator
Reister, D.B.
1996-02-01T23:59:59.000Z
We have considered the problem of determining the values of the joint variables of a mobile manipulator with many redundant degrees of freedom that will minimize an objective function when the position and orientation of the end of the manipulator are given. The objective function is the weighted sum of three components: distance, torque, and reach. Each of the three components is a max or min. We have converted the min-max optimization problem into a nonlinear programming problem and used the Kuhn-Tucker conditions to derive necessary conditions for the optimum solutions. The necessary conditions require that one or more of each of the three sets (distance, torque, and reach) of nonnegative Lagrange multipliers must be positive. If one of the Lagrange multipliers is positive, the corresponding slack variable must be zero. When two or more of the Lagrange multipliers from a single set are positive, the slack variables place constraints on the joint variables. Specification of the Cartesian position and orientation of the end of the arm also places constraints on the joint variables. If the mobile manipulator has N degrees of freedom and the total number of constraints is M, the constraints define a manifold of dimensions N - M. When N = M, the dimension of the manifold is zero (it consists of isolated points). When N > M, a search of the manifold may yield a submanifold that maximizes the Lagrangian function. We discuss examples where the number of slack variable constraints (M) is two or more.
Blasting the way to synchronous communications
Charbonnet, P. Jr.; Smith, G.
1984-01-18T23:59:59.000Z
Minicomputer and microcomputer users now have several new options in data communications software. Most of these packages fall into the rapidly growing category of file-transfer utilities-that is, programs that exchange computers. The key factor in the development of these products is that most micros and minis have only asynchronous communications capability. They cannot use mainframe data communications protocols. All of the asynchronous protocols that have emerged use the standard synchronous technique for error detection: the data stream is divided into blocks, and the integrity of each block is monitored by appending a check-sum that is recomputed and compared with the original check-sum when the block is received. Full-duplex protocols such as blocked asynchronous transmission (blast) transmit a continuous stream of data blocks while using the other half of the communications channel to receive block acknowledgements simultaneously. This structure is combined with the use of sliding window or pipelining techniques as employed by sophisticated synchronous protocols such as SNA/SDLC and x.25/HDLC. The end result is that full-duplex asynchronous protocols can endure significant propagation delay without losing efficiency. They are suitable for use in a variety of communications environments.
Intelligent Predictive Control Methods for Synchronous Power System
Rizvi, Syed Z.
Intelligent Predictive Control Methods for Synchronous Power System Muhammad S. Yousuf Electrical with the control of the system in case of perturbations. Optimal control theory for stabilizing SMIB power systems@kfupm.edu.sa Abstract--In this paper, an intelligent Model Predictive Con- troller (MPC) for a Synchronous Power Machine
Synchronization in Cooperative Networks: Estimation of Multiple Carrier Frequency Offsets
Blostein, Steven D.
and reliability when assuming perfect synchronization [2]. Moreover, even though many coop- erative space coding synchronization is key to future deployments of cooperative networks. Multiple-input-single-output (MISO) systems methods for MISO systems include [5][7]. In [5], a maximum-likelihood estimator (MLE) for CFO estimation
Processus communicants Communication synchrone CSP/CCS/-calcul
Grigoras, .Romulus
Processus communicants Communication synchrone CSP/CCS/-calcul Rendez-vous étendu Ada Huitičme partie Processus communicants CSP/Ada Systčmes concurrents 2 / 44 #12;Processus communicants Communication synchrone CSP/CCS/-calcul Rendez-vous étendu Ada Principes Synchronisation Désignation
On precision of wavelet phase synchronization of chaotic systems
Postnikov, E. B. [Kursk State University (Russian Federation)], E-mail: postnicov@mail.ru
2007-10-15T23:59:59.000Z
It is shown that time-scale synchronization of chaotic systems with ill-defined conventional phase is achieved by using wavelet transforms with center frequencies above a certain threshold value. It is found that the possibility of synchronization detection by introducing a wavelet phase is related to diffusion averaging of the analyzed signals.
Profile synchronization guide for Microsoft SharePoint Server 2010
Hunt, Galen
Profile synchronization guide for Microsoft SharePoint Server 2010 Microsoft Corporation Published describes how to plan and configure profile synchronization in Microsoft SharePoint Server 2010. Also included is technical reference information about profile properties, data types, and permissions
Synchronous Binarization for Machine Translation Computer Science Department
Gildea, Daniel
Synchronous Binarization for Machine Translation Hao Zhang Computer Science Department University Systems based on synchronous grammars and tree transducers promise to improve the quality of statistical machine transla- tion output, but are often very computa- tionally intensive. The complexity is ex
Equisolvability of Series vs. Controller's Topology in Synchronous Language Equations
Brayton, Robert K.
Equisolvability of Series vs. Controller's Topology in Synchronous Language Equations Nina operators for abstract languages: synchronous composition, #15;, and parallel composition, #5;, and we studied the solutions of the equations defined over finite state machines (FSMs) of the type MA #15; MX
Symmetric Clock Synchronization in Sensor Networks Philipp Sommer
Efficiency 1 Introduction Clock synchronization is a major building block in wire- less sensor networks, and maybe even more importantly, clock synchronization plays a major role in energy efficiency. State-of-the art energy-efficient sen- sor network protocols, e.g. [2], have advanced duty cycling schemes. Nodes
Cross-layered Synchronization Protocol for Wireless Sensor Networks
Paris-Sud XI, Université de
Cross-layered Synchronization Protocol for Wireless Sensor Networks Thomas Beluch, Daniela. Advances in wireless sensor network performances and improvement of attainable bit rates allow research on such measurement systems using Wireless Sensor Networks (WSNs). However, current WSN synchronization protocols do
Controlling synchronization in large laser networks using number theory
Micha Nixon; Moti Fridman; Eitan Ronen; Asher A. Friesem; Nir Davidson; Ido Kanter
2011-12-18T23:59:59.000Z
Synchronization in networks with delayed coupling are ubiquitous in nature and play a key role in almost all fields of science including physics, biology, ecology, climatology and sociology. In general, the published works on network synchronization are based on data analysis and simulations, with little experimental verification. Here we develop and experimentally demonstrate various multi-cluster phase synchronization scenarios within coupled laser networks. Synchronization is controlled by the network connectivity in accordance to number theory, whereby the number of synchronized clusters equals the greatest common divisor of network loops. This dependence enables remote switching mechanisms to control the optical phase coherence among distant lasers by local network connectivity adjustments. Our results serve as a benchmark for a broad range of coupled oscillators in science and technology, and offer feasible routes to achieve multi-user secure protocols in communication networks and parallel distribution of versatile complex combinatorial tasks in optical computers.
Arabshahi, Payman
of the synchronization sequence. NASA's Jet Propulsion Laboratory, Pasadena, California An algorithm for rapid a prescribed sequence of pulses -- the synchronization sequence or word -- into the transmitted data stream starting points for a sequence of received pulses detected in the presence of noise. It is assumed
The use and misuse of Vc,max in Earth System Models Alistair Rogers
Ohta, Shigemi
REVIEW The use and misuse of Vc,max in Earth System Models Alistair Rogers Received: 18 November Dordrecht (outside the USA) 2013 Abstract Earth System Models (ESMs) aim to project global change. Central Á Vc,max Á Leaf nitrogen Á Earth System Models Introduction The primary goal of Earth System Models
Living and working in Germany A guide for international scientists at Max Planck Institutes
Living and working in Germany A guide for international scientists at Max Planck Institutes #12 and the hospitality in your town. You will quickly find that Germany is a country of many facets a country Planck Society is Germany's most successful scientific or- ganisation in basic research. Max Planck
The Max Planck Society At home in Germany -present throughout the world
1 The Max Planck Society At home in Germany - present throughout the world Internationalisation the Max Planck Society's role in safeguarding Germany's future Cooperation across national borders is one the internationalisation of science, both on its own behalf and also on behalf of Germany as a research location. To do
07. September 2007 Julia Ducke 1 Max-Planck-Institut fr
07. September 2007 Julia Ducke 1 Max-Planck-Institut für Mikrostrukturphysik HalleWeb 2.0-Workshop Wiki Erfahrungen mit Web 2.0 Erfahrungsbericht aus der Bibliothek des MPI für Mikrostrukturphysik #12;07. September 2007 Julia Ducke 2 Max-Planck-Institut für Mikrostrukturphysik HalleWeb 2.0-Workshop #12
Andreas Sundelf, Valerio Bartolino, Max Cardinale Aqua reports 2013:15
Andreas Sundelöf, Valerio Bartolino, Max Cardinale Aqua reports 2013:15 Waking the Deads Final report #12;Waking the Deads Final report Andreas Sundelöf, Valerio Bartolino, Max Cardinale Address SLU 2013 SLU, Department of Aquatic Resources Aqua reports 2013:15 ISBN: 978-91-576-9177-4 (elektronisk
IEEE TRANSACTIONS ON AUTOMATIC CONTROL 1 Max-Plus Control Design for Temporal Constraints
Paris-Sud XI, Université de
constraints, timed event graph (TEG). I. INTRODUCTION Many manufacturing systems are subject to tight time with Timed Event Graphs (TEG), that permit to take time constraints explicitely into account. The problem). As is well-known from [5], TEG give rise to Max-Plus algebraic models, which are linear over the dioid max
Stability trends of MAX phases from first principles
Dahlqvist, M.; Alling, B.; Rosen, J. [Department of Physics, Chemistry, and Biology, IFM, Linkoeping University, SE-581 83 Linkoeping (Sweden)
2010-06-01T23:59:59.000Z
We have developed a systematic method to investigate the phase stability of M{sub n+1}AX{sub n} phases, here applied for M=Sc, Ti, V, Cr, or Mn, A=Al, and X=C or N. Through a linear optimization procedure including all known competing phases, we identify the set of most competitive phases for n=1-3 in each system. Our calculations completely reproduce experimental occurrences of stable MAX phases. We also identify and suggest an explanation for the trend in stability as the transition metal is changed across the 3d series for both carbon- and nitrogen-based systems. Based on our results, the method can be used to predict stability of potentially existing undiscovered phases.
ACS SYMPOSIUM SERIES 966 Rational Environmental
Hammock, Bruce D.
ACS SYMPOSIUM SERIES 966 Rational Environmental Management of Agrochemicals Risk Assessment-Bayo, Editor Chiha University Sponsored by the ACS Division of Agrochemicals American Chemical Society of agrochemicals : risk assessment, monitoring, and remedial action / Ivan R. Kennedy, editor. ..[et al
Solid State AC Motor Drives - Conservation Perspectives
Mohan, N.; Ferraro, R. J.
1982-01-01T23:59:59.000Z
Variable Frequency Solid-State Inverters: can control the speed of ac motors by producing adjustable frequency ac voltage, with an enormous potential for energy conservation in pumps and air handling systems. 3. Other Variable Frequency Drives: include...
Umans, Stephen D; Nisley, Donald L; Melfi, Michael J
2014-10-28T23:59:59.000Z
A line-start synchronous motor has a housing, a rotor shaft, and an output shaft. A soft-start coupling portion is operatively coupled to the output shaft and the rotor shaft. The soft-start coupling portion is configurable to enable the synchronous motor to obtain synchronous operation and to drive, at least near synchronous speed during normal steady state operation of the motor, a load having characteristics sufficient to prevent obtaining normal synchronous operation of the motor when the motor is operatively connected to the load in the absence of the soft-start coupling. The synchronous motor is sufficiently rated to obtain synchronous operation and to drive, at least near synchronous speed during normal steady state operation of the motor, a load having characteristics sufficient to prevent obtaining normal synchronous operation of the motor when the motor is operatively connected to the load in the absence of the soft-start coupling.
Summary Report on Synchronization, Diagnostics and Instrumentation
Arne Freyberger
2005-03-19T23:59:59.000Z
The proceedings of Working Group 4 of the 2005 Energy Recovery Linac (ERL) workshop are summarized. Working Group 4 dealt with the challenging topic of beam diagnostics for ERL machines. Energy Recovery Linacs represent a challenge for beam diagnostics from several perspectives; invasive versus non-invasive diagnostics, longitudinal and transverse beam diagnostics, overall machine timing/synchronization and machine protection. Beam diagnostics for an ERL can benefit strongly from the experience at third generation light sources, recirculating linacs and presently operating ERLs. During the workshop there were presentations from all these communities, representing a large range operation experience in beam diagnostics. A brief summary Working Group 4 discussion is presented in this paper.
Web services synchronization health care application
Limam, Hela
2011-01-01T23:59:59.000Z
With the advance of Web Services technologies and the emergence of Web Services into the information space, tremendous opportunities for empowering users and organizations appear in various application domains including electronic commerce, travel, intelligence information gathering and analysis, health care, digital government, etc. In fact, Web services appear to be s solution for integrating distributed, autonomous and heterogeneous information sources. However, as Web services evolve in a dynamic environment which is the Internet many changes can occur and affect them. A Web service is affected when one or more of its associated information sources is affected by schema changes. Changes can alter the information sources contents but also their schemas which may render Web services partially or totally undefined. In this paper, we propose a solution for integrating information sources into Web services. Then we tackle the Web service synchronization problem by substituting the affected information sources....
Some aspects of the synchronization in coupled maps
Sandro E. de Souza Pinto; José T. Lunardi; Abdala M. Saleh; Antonio M. Batista
2005-04-06T23:59:59.000Z
Through numerical simulations we analyze the synchronization time and the Lyapunov dimension of a coupled map lattice consisting of a chain of chaotic logistic maps exhibiting power law interactions. From the observed behaviors we find a lower bound for the size $N$ of the lattice, independent of the range and strength of the interaction, which imposes a practical lower bound in numerical simulations for the system to be considered in the thermodynamic limit. We also observe the existence of a strong correlation between the averaged synchronization time and the Lyapunov dimension. This is an interesting result because it allows an analytical estimation of the synchronization time, which otherwise requires numerical simulations.
Synchronization of networks of oscillators with distributed delay coupling
Y. N. Kyrychko; K. B. Blyuss; E. Schoell
2014-10-27T23:59:59.000Z
This paper studies the stability of synchronized states in networks where couplings between nodes are characterized by some distributed time delay, and develops a generalized master stability function approach. Using a generic example of Stuart-Landau oscillators, it is shown how the stability of synchronized solutions in networks with distributed delay coupling can be determined through a semi-analytic computation of Floquet exponents. The analysis of stability of fully synchronized and of cluster or splay states is illustrated for several practically important choices of delay distributions and network topologies.
Cluster synchronization in networks of neurons with chemical synapses
Juang, Jonq, E-mail: jjuang@math.nctu.edu.tw [Department of Applied Mathematics, and Center of Mathematics Modeling and Scientific Computing, National Chiao Tung University, Hsinchu, Taiwan and National Center for Theoretical Sciences, Hsinchu, Taiwan (China)] [Department of Applied Mathematics, and Center of Mathematics Modeling and Scientific Computing, National Chiao Tung University, Hsinchu, Taiwan and National Center for Theoretical Sciences, Hsinchu, Taiwan (China); Liang, Yu-Hao, E-mail: moonsea.am96g@g2.nctu.edu.tw [Department of Mathematics, National Tsing Hua University, Hsinchu, Taiwan (China)] [Department of Mathematics, National Tsing Hua University, Hsinchu, Taiwan (China)
2014-03-15T23:59:59.000Z
In this work, we study the cluster synchronization of chemically coupled and generally formulated networks which are allowed to be nonidentical. The sufficient condition for the existence of stably synchronous clusters is derived. Specifically, we only need to check the stability of the origins of m decoupled linear systems. Here, m is the number of subpopulations. Examples of nonidentical networks such as Hindmarsh-Rose (HR) neurons with various choices of parameters in different subpopulations, or HR neurons in one subpopulation and FitzHugh-Nagumo neurons in the other subpopulation are provided. Explicit threshold for the coupling strength that guarantees the stably cluster synchronization can be obtained.
A Greedy Distributed Time Synchronization Algorithm for Wireless Sensor Networks
Tam, Vincent W. L.
synchronizations performed. I. INTRODUCTION With the advance in various enabling technologies like Micro-Electro-Mechanical System (MEMS), signal process- ing and wireless communication, wireless sensor networks (WSNs) have drawn
Synchronized Collective Behavior via Low-cost Communication
Hai-Tao Zhang; Michael ZhiQiang Chen; Tao Zhou
2007-07-23T23:59:59.000Z
An important natural phenomenon surfaces that satisfactory synchronization of self-driven particles can be achieved via sharply reduced communication cost, especially for high density particle groups with low external noise. Statistical numerical evidence illustrates that a highly efficient manner is to distribute the communication messages as evenly as possible along the whole dynamic process, since it minimizes the communication redundancy. More surprisingly, it is discovered that there exist some abnormal regions where moderately decreasing the communication cost can even improve the synchronization performance. A phase diagram on the noise-density parameter space is given, where the dynamical behaviors can be divided into three qualitatively different phases: normal phase where better synchronization corresponds to higher communication cost, abnormal phase where moderately decreasing communication cost could even improve the synchronization, and the disordered phase where no coherence among individuals is observed.
Performance analysis of synchronous machines under dynamic eccentricity
Al-Nuaim, Nabil Abdulaziz
1996-01-01T23:59:59.000Z
The performance of salient pole synchronous machines under eccentric rotors is studied. Relationships between stator and rotor current induced harmonics and dynamic eccentricity are investigated. The winding function theory has been modified...
Permanent magnet assisted synchronous reluctance motor, design and performance improvement
Niazi, Peyman
2006-04-12T23:59:59.000Z
Recently, permanent magnet assisted (PMa)-synchronous reluctance motors (SynRM) have been considered as a possible alternative motor drive for high performance applications. In order to have an efficient motor drive, ...
Robust Clock Synchronization Methods for Wireless Sensor Networks
Lee, Jae Han
2011-10-21T23:59:59.000Z
in general with energy-limited sensors capable of collecting, processing and transmitting information across short distances. Clock synchronization plays an important role in designing, implementing, and operating wireless sensor networks, and it is essential...
Compiling Synchronous Kahn Networks to Efficient Reconfigurable Hardware
Vuillemin, Jean
Compiling Synchronous Kahn Networks to Efficient Reconfigurable Hardware Jean Vuillemin , Jean research on automatically compiling efficient reconfigurable hardware from high level software stream. Commercial systems exist to generate hardware (say VHDL) from high-level (say C) code [6]. Yet
Experimental Comparison of Synchronous-Clock Cooperative Acoustic Navigation Algorithms
Eustice, Ryan
growth as subsea vehicles do not typically have access to an absolute position reference. Synchronous absolute position reference. Subsea and topside nodes are color coded by blue and green, respectively
Performance analysis of synchronous machines under dynamic eccentricity
Al-Nuaim, Nabil Abdulaziz
1996-01-01T23:59:59.000Z
The performance of salient pole synchronous machines under eccentric rotors is studied. Relationships between stator and rotor current induced harmonics and dynamic eccentricity are investigated. The winding function theory has been modified...
A convex parameterization for solving constrained min-max problems with a quadratic cost
Cambridge, University of
.ac.uk Departamento de Ingenieria de Sistemas y Automatica, Universidad de Sevilla, Camino de los Descumbrimientos s
Max Tech and Beyond: Maximizing Appliance and Equipment Efficiency by Design
Desroches, Louis-Benoit
2012-01-01T23:59:59.000Z
features/20100611_ac.html [8] Nautica Dehumidifiers. http://claims of up to 50%). Nautica Dehumidifiers offers such
A synchronized cell suspension method for growing virus
Zuloaga Guillermo Gerardo
1970-01-01T23:59:59.000Z
: g (Hs bar j An@net L9~p'0 ABSTRACT A Synchronized Cell Suspension Method. for Growing Virus. (August 1970) Guillermo Gerardo Zuloaga, Licentiate, Buenos Aires, Argentina; M. S. , Texas ARM University Directed. by: Dr. Stewart Mc...Connell The purpose of this study was to develop tech- niques for growing viruses in a synchronized. suspen- sion cell culture system. Virus replication in such a system should potentially yield a greater quantity of high quality antigen essential for vaccine...
Projective synchronization in fractional order chaotic systems and its control
Chunguang Li
2006-04-24T23:59:59.000Z
The chaotic dynamics of fractional (non-integer) order systems have begun to attract much attention in recent years. In this paper, we study the projective synchronization in two coupled fractional order chaotic oscillators. It is shown that projective synchronization can also exist in coupled fractional order chaotic systems. A simple feedback control method for controlling the scaling factor onto a desired value is also presented.
Sari, Ilkay
2009-06-02T23:59:59.000Z
Every individual node in a network has its own clock. The clock consists of hardware and software parts. The hardware part includes an oscillator and a counter. The counter is incremented in accordance with the zero-crossings or the edges of the periodic... in time-synchronization protocols is a rather simple process, one node tells the other one its time in a controlled manner just like saying \\it?s ten past flve according to my clock". There are two main methods to exchange time-stamps. The flrst method...
Low latency memory access and synchronization
Blumrich, Matthias A. (Ridgefield, CT); Chen, Dong (Croton On Hudson, NY); Coteus, Paul W. (Yorktown Heights, NY); Gara, Alan G. (Mount Kisco, NY); Giampapa, Mark E. (Irvington, NY); Heidelberger, Philip (Cortlandt Manor, NY); Hoenicke, Dirk (Ossining, NY); Ohmacht, Martin (Brewster, NY); Steinmacher-Burow, Burkhard D. (Mount Kisco, NY); Takken, Todd E. (Mount Kisco, NY), Vranas; Pavlos M. (Bedford Hills, NY)
2010-10-19T23:59:59.000Z
A low latency memory system access is provided in association with a weakly-ordered multiprocessor system. Bach processor in the multiprocessor shares resources, and each shared resource has an associated lock within a locking device that provides support for synchronization between the multiple processors in the multiprocessor and the orderly sharing of the resources. A processor only has permission to access a resource when it owns the lock associated with that resource, and an attempt by a processor to own a lock requires only a single load operation, rather than a traditional atomic load followed by store, such that the processor only performs a read operation and the hardware locking device performs a subsequent write operation rather than the processor. A simple prefetching for non-contiguous data structures is also disclosed. A memory line is redefined so that in addition to the normal physical memory data, every line includes a pointer that is large enough to point to any other line in the memory, wherein the pointers to determine which memory line to prefetch rather than some other predictive algorithm. This enables hardware to effectively prefetch memory access patterns that are non-contiguous, but repetitive.
Low latency memory access and synchronization
Blumrich, Matthias A. (Ridgefield, CT); Chen, Dong (Croton On Hudson, NY); Coteus, Paul W. (Yorktown Heights, NY); Gara, Alan G. (Mount Kisco, NY); Giampapa, Mark E. (Irvington, NY); Heidelberger, Philip (Cortlandt Manor, NY); Hoenicke, Dirk (Ossining, NY); Ohmacht, Martin (Brewster, NY); Steinmacher-Burow, Burkhard D. (Mount Kisco, NY); Takken, Todd E. (Mount Kisco, NY); Vranas, Pavlos M. (Bedford Hills, NY)
2007-02-06T23:59:59.000Z
A low latency memory system access is provided in association with a weakly-ordered multiprocessor system. Each processor in the multiprocessor shares resources, and each shared resource has an associated lock within a locking device that provides support for synchronization between the multiple processors in the multiprocessor and the orderly sharing of the resources. A processor only has permission to access a resource when it owns the lock associated with that resource, and an attempt by a processor to own a lock requires only a single load operation, rather than a traditional atomic load followed by store, such that the processor only performs a read operation and the hardware locking device performs a subsequent write operation rather than the processor. A simple prefetching for non-contiguous data structures is also disclosed. A memory line is redefined so that in addition to the normal physical memory data, every line includes a pointer that is large enough to point to any other line in the memory, wherein the pointers to determine which memory line to prefetch rather than some other predictive algorithm. This enables hardware to effectively prefetch memory access patterns that are non-contiguous, but repetitive.
Analysis and design of a direct AC to AC matrix converter topology
Choi, Sewan
1992-01-01T23:59:59.000Z
- eration. With the advent of the thyristor and more recent devices such as the Metal oxided semiconductor field effect transistor(MOSI'ET), the Insulated gate bipolar transistor(IGBT) and the MOS controlled thyristor(MCT), it has become increas- ingly... commutated devices such as OTO's, IGBT's, IVIOSFET's and MCT's. The principle of forced commutation is used in clirect ac to ac matrix converter which is described in the next section. B. Direct AC to AC Matrix Converter Direct ac to ac matrix converters...
A Connectionist model of Planning via Back-chaining Search Max Garagnani
Shastri, Lokendra
A Connectionist model of Planning via Back-chaining Search Max Garagnani Department of Computing+1 World state ObservableEpisodic Memory ECALL Figure 1: A block diagram showing the basic compo
Max-Min characterization of the mountain pass energy level for a class of variational problems
Jacopo Bellazzini; Nicola Visciglia
2009-09-01T23:59:59.000Z
We provide a max-min characterization of the mountain pass energy level for a family of variational problems. As a consequence we deduce the mountain pass structure of solutions to suitable PDEs, whose existence follows from classical minimization argument.
Keynote speakers Susan E. Trumbore -Max-Planck-Institute for Biogeochemistry Jena, Germany
Daniel, Rosenfeld
Keynote speakers Susan E. Trumbore - Max-Planck-Institute for Biogeochemistry Jena, Germany http for Landscape Biogeochemistry, Germany http://www.arthur-gessler.de/ PhillippeTortell, University of British
A Sensor-Based Interactive Digital Installation System for Virtual Painting Using MAX/MSP/Jitter
Arenas, Anna G.
2010-01-16T23:59:59.000Z
A SENSOR-BASED INTERACTIVE DIGITAL INSTALLATION SYSTEM FOR VIRTUAL PAINTING USING MAX/MSP/JITTER A Thesis by ANNA GRACIELA ARENAS Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE December 2008 Major Subject: Visualization Sciences A SENSOR-BASED INTERACTIVE DIGITAL INSTALLATION SYSTEM FOR VIRTUAL PAINTING USING MAX/MSP/JITTER A Thesis by ANNA GRACIELA ARENAS...
Synchronization in node of complex networks consist of complex chaotic system
Wei, Qiang, E-mail: qiangweibeihua@163.com [Beihua University computer and technology College, BeiHua University, Jilin, 132021, Jilin (China); Digital Images Processing Institute of Beihua University, BeiHua University, Jilin, 132011, Jilin (China); Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian, 116024 (China); Xie, Cheng-jun [Beihua University computer and technology College, BeiHua University, Jilin, 132021, Jilin (China); Digital Images Processing Institute of Beihua University, BeiHua University, Jilin, 132011, Jilin (China); Liu, Hong-jun [School of Information Engineering, Weifang Vocational College, Weifang, 261041 (China); Li, Yan-hui [The Library, Weifang Vocational College, Weifang, 261041 (China)
2014-07-15T23:59:59.000Z
A new synchronization method is investigated for node of complex networks consists of complex chaotic system. When complex networks realize synchronization, different component of complex state variable synchronize up to different scaling complex function by a designed complex feedback controller. This paper change synchronization scaling function from real field to complex field for synchronization in node of complex networks with complex chaotic system. Synchronization in constant delay and time-varying coupling delay complex networks are investigated, respectively. Numerical simulations are provided to show the effectiveness of the proposed method.
Synchronization in Complex Oscillator Networks and Smart Grids
Dorfler, Florian [Los Alamos National Laboratory; Chertkov, Michael [Los Alamos National Laboratory; Bullo, Francesco [Center for Control, Dynamical Systems and Computation, University of California at Santa Babara, Santa Barbara CA
2012-07-24T23:59:59.000Z
The emergence of synchronization in a network of coupled oscillators is a fascinating topic in various scientific disciplines. A coupled oscillator network is characterized by a population of heterogeneous oscillators and a graph describing the interaction among them. It is known that a strongly coupled and sufficiently homogeneous network synchronizes, but the exact threshold from incoherence to synchrony is unknown. Here we present a novel, concise, and closed-form condition for synchronization of the fully nonlinear, non-equilibrium, and dynamic network. Our synchronization condition can be stated elegantly in terms of the network topology and parameters, or equivalently in terms of an intuitive, linear, and static auxiliary system. Our results significantly improve upon the existing conditions advocated thus far, they are provably exact for various interesting network topologies and parameters, they are statistically correct for almost all networks, and they can be applied equally to synchronization phenomena arising in physics and biology as well as in engineered oscillator networks such as electric power networks. We illustrate the validity, the accuracy, and the practical applicability of our results in complex networks scenarios and in smart grid applications.
Synchronization in Complex Oscillator Networks and Smart Grids
Florian Dörfler; Michael Chertkov; Francesco Bullo
2012-07-31T23:59:59.000Z
The emergence of synchronization in a network of coupled oscillators is a fascinating topic in various scientific disciplines. A coupled oscillator network is characterized by a population of heterogeneous oscillators and a graph describing the interaction among them. It is known that a strongly coupled and sufficiently homogeneous network synchronizes, but the exact threshold from incoherence to synchrony is unknown. Here we present a novel, concise, and closed-form condition for synchronization of the fully nonlinear, non-equilibrium, and dynamic network. Our synchronization condition can be stated elegantly in terms of the network topology and parameters, or equivalently in terms of an intuitive, linear, and static auxiliary system. Our results significantly improve upon the existing conditions advocated thus far, they are provably exact for various interesting network topologies and parameters, they are statistically correct for almost all networks, and they can be applied equally to synchronization phenomena arising in physics and biology as well as in engineered oscillator networks such as electric power networks. We illustrate the validity, the accuracy, and the practical applicability of our results in complex networks scenarios and in smart grid applications.
High frequency AC power converter for low voltage circuits
Salazar, Nathaniel Jay Tobias
2012-01-01T23:59:59.000Z
This thesis presents a novel AC power delivery architecture that is suitable for VHF frequency (50-100MHz) polyphase AC/DC power conversion in low voltage integrated circuits. A complete AC power delivery architecture was ...
Complete synchronization in coupled Type-I neurons
Malik, Nishant; Balakrishnan, J
2010-01-01T23:59:59.000Z
For a system of type-I neurons bidirectionally coupled through a nonlinear feedback mechanism, we discuss the issue of noise-induced complete synchronization (CS). For the inputs to the neurons, we point out that the rate of change of instantaneous frequency with the instantaneous phase of the stochastic inputs to each neuron matches exactly with that for the other in the event of CS of their outputs. Our observation can be exploited in practical situations to produce completely synchronized outputs in artificial devices. For excitatory-excitatory synaptic coupling, a functional dependence for the synchronization error on coupling and noise strengths is obtained. Finally we report an observation of noise-induced CS between non-identical neurons coupled bidirectionally through random non-zero couplings in an all-to- all way in a large neuronal ensemble.
Magnetic levitation configuration incorporating levitation, guidance and linear synchronous motor
Coffey, Howard T. (Darien, IL)
1993-01-01T23:59:59.000Z
A propulsion and suspension system for an inductive repulsion type magnetically levitated vehicle which is propelled and suspended by a system which includes propulsion windings which form a linear synchronous motor and conductive guideways, adjacent to the propulsion windings, where both combine to partially encircling the vehicle-borne superconducting magnets. A three phase power source is used with the linear synchronous motor to produce a traveling magnetic wave which in conjunction with the magnets propel the vehicle. The conductive guideway combines with the superconducting magnets to provide for vehicle leviation.
Global synchronization of bursting neurons in clustered networks
C. A. S. Batista; R. V. Nunes; A. M. Batista; R. L. Viana; S. R. Lopes; T. Pereira
2010-12-20T23:59:59.000Z
We investigate the collective dynamics of bursting neurons on clustered network. The clustered network is composed of subnetworks each presenting a small-world property, and in a given subnetwork each neuron has a probability to be connected to the other subnetworks. We give bounds for the critical coupling strength to obtain global burst synchronization in terms of the network structure, i.e., intracluster and intercluster probabilities connections. As the heterogeneity in the network is reduced the network global synchronization is improved. We show that the transitions to global synchrony may be abrupt or smooth depending on the intercluster probability.
Time Synchronization in Hierarchical TESLA Wireless Sensor Networks
Jason L. Wright; Milos Manic
2009-08-01T23:59:59.000Z
Time synchronization and event time correlation are important in wireless sensor networks. In particular, time is used to create a sequence events or time line to answer questions of cause and effect. Time is also used as a basis for determining the freshness of received packets and the validity of cryptographic certificates. This paper presents secure method of time synchronization and event time correlation for TESLA-based hierarchical wireless sensor networks. The method demonstrates that events in a TESLA network can be accurately timestamped by adding only a few pieces of data to the existing protocol.
Synchronization of multimedia streams over packet-switched networks
Brewer, Jason M.
1995-01-01T23:59:59.000Z
65 66 66 68 REFERENCES APPENDIX A 71 74 VITA 75 vm LIST OF TABLES TABLE Page I Compression options for VAT II Compression options for NeVoT LIST OF FIGURES FIGURE Page Density and PDF of NV encoding delay at 5 fps. 10 32-bit Cell code... of synchronized H. 261 video. 59 31 Playout offset along with audio delay. Playout off'set of unsynchronized NV video. 60 33 Playout off'set of synchronized NV video. 60 34 End-to-end delay with coding change in middle of sequence. 61 Tracking a change...
Magnetic levitation configuration incorporating levitation, guidance and linear synchronous motor
Coffey, H.T.
1993-10-19T23:59:59.000Z
A propulsion and suspension system for an inductive repulsion type magnetically levitated vehicle which is propelled and suspended by a system which includes propulsion windings which form a linear synchronous motor and conductive guideways, adjacent to the propulsion windings, where both combine to partially encircling the vehicle-borne superconducting magnets. A three phase power source is used with the linear synchronous motor to produce a traveling magnetic wave which in conjunction with the magnets propel the vehicle. The conductive guideway combines with the superconducting magnets to provide for vehicle levitation. 3 figures.
Chung, Soon-Jo, 1976-
2007-01-01T23:59:59.000Z
This dissertation focuses on the synchronization of multiple dynamical systems using contraction theory, with applications to cooperative control of multi-agent systems and synchronization of interconnected dynamics such ...
Analysis of electrical signatures in synchronous generators characterized by bearing faults
Choi, Jae-Won
2009-05-15T23:59:59.000Z
Synchronous generators play a vital role in power systems. One of the major mechanical faults in synchronous generators is related to bearings. The popular vibration analysis method has been utilized to detect bearing faults for years. However...
Modeling, Simulation, and Practice of Floor Control for Synchronous and Ubiquitous
: Floor control, Ubiquitous collaboration, Synchronous collaboration, Mobile devices, Human-computer dispersed virtual place. Mobile computing paradigm [34] made ubiquitous access possible with the integration1 Modeling, Simulation, and Practice of Floor Control for Synchronous and Ubiquitous Collaboration
Co-coupled synchronization of fractional-order unified chaotic systems
Kehui Sun; Jian Ren; Shuisheng Qiu
2009-09-13T23:59:59.000Z
Synchronization of fractional-order chaotic systems is a hot topic in the field of nonlinear study. The co-coupled synchronization between two fractional-order chaotic systems with different initial conditions is investigated in this paper. Based on Lyapunov stability principle and Gerschgorin theorem, the co-coupled synchronization theorem of fractional-order chaotic systems is deduced, and the range of coupling coefficients is confirmed for synchronization of fractional-order unified chaotic systems. By building up the synchronization simulation model on Simulink, the co-coupled synchronization between two fractional-order unified chaotic systems with different initial value is carried out, and the synchronization performances are analyzed, and the simulation results show that this synchronization method is effective.
strath.ac.uk/naome Naval Architecture,
Strathclyde, University of
strath.ac.uk/naome Naval Architecture, Ocean and Marine Engineering Postgraduate course information #12;Naval Architecture, Ocean and Marine Engineering strath.ac.uk/naomeContents02 03 Glasgow 04 and Opportunities 16 Success Stories 18 Course Overview 20 Sustainable Engineering 22 Marine Engineering 24
www.accommodation.salford.ac.uk Accommodation
Romano, Daniela
sets out the main elements of good management practice. It covers health and safety, maintenancewww.accommodation.salford.ac.uk Accommodation Guide to University and University partner accommodation #12;32 www.accommodation.salford.ac.ukA guide to University and Partner accommodation Welcome
Solar Electric Grid Integration - Advanced Concepts (SEGIS-AC...
Solar Electric Grid Integration - Advanced Concepts (SEGIS-AC) Funding Opportunity Solar Electric Grid Integration - Advanced Concepts (SEGIS-AC) Funding Opportunity Through the...
AVTA: Clipper Creek AC Level 2 Charging System Testing Results...
Broader source: Energy.gov (indexed) [DOE]
electric vehicles. This research was conducted by Idaho National Laboratory. Clipper Creek AC Level 2 - February 2012 More Documents & Publications AVTA: Aerovironment AC Level...
AXIAL-FIELD SYNCHRONOUS MACHINE WITH HOMOPOLAR FLUX IN THE AIRGAP FOR A FLYWHEEL ACCUMULATOR
Paris-Sud XI, Université de
AXIAL-FIELD SYNCHRONOUS MACHINE WITH HOMOPOLAR FLUX IN THE AIRGAP FOR A FLYWHEEL ACCUMULATOR@bretagne.ens-cachan.fr Abstract: A new axial-field synchronous machine designed for a flywheel accumulator is presented herein with experimental results. Keywords: flywheel accumulator, axial-field synchronous machine, double-face printed
14th World Congress of IFACON ADAPTIVE OBSERVER-BASED SYNCHRONIZATION FOR COM... Copyright 1999 IFAC
14th World Congress of IFACON ADAPTIVE OBSERVER-BASED SYNCHRONIZATION FOR COM... Copyright © 1999 ···· Synchronization ···· Communications ISBN: 0 08 043248 4Copyright 1999 IFAC #12;14th World Congress of IFACON ADAPTIVE OBSERVER-BASED SYNCHRONIZATION FOR COM... ISBN: 0 08 043248 4Copyright 1999 IFAC #12;14th World
Szabados, Barna
Permanent Magnet Synchronous Machines Abstract: An experimental investigation is conducted to determine the behaviour of brushless PM synchronous machine parameters in the high speed flux weakening operating range synchronous machines. Special computer assisted measuring techniques are employed using an experimental vector
Language Support for Synchronous Parallel Critical Sections Christoph W. Keler Helmut Seidl
Kessler, Christoph
elegant and effiÂ cient programs for synchronous shared memory MIMD machines (also known as PRAM's). PRAMLanguage Support for Synchronous Parallel Critical Sections Christoph W. KeĂ?ler Helmut Seidl@psi.uniÂtrier.de Abstract We introduce a new parallel programming paradigm, namely synchronous parallel critical sections
Language Support for Synchronous Parallel Critical Sections Christoph W. Ke ler Helmut Seidl
Kessler, Christoph
and e - cient programs for synchronous shared memory MIMD machines (also known as PRAM's). PRAMLanguage Support for Synchronous Parallel Critical Sections Christoph W. Ke ler Helmut Seidl@psi.uni-trier.de Abstract We introduce a new parallel programming paradigm, namely synchronous parallel critical sections
The Synchronous Boltzmann Machine for learning and hard-combinatoric search
Jones, Antonia J.
The Synchronous Boltzmann Machine for learning and hard-combinatoric search Ursula X. IturrarĂˇn. Learning with synchronous Boltzmann machines provides an attractive alternative provided that one can offer a suitable theoretical framework. The dynamics of the synchronous Boltzmann machine were first studied by W
RESTRICTING THE WEAK-GENERATIVE CAPACITY OF SYNCHRONOUS TREE-ADJOINING GRAMMARS
Shieber, Stuart
: Synchronous tree-adjoining grammars, weak-generative ca- pacity, machine translation, naturalRESTRICTING THE WEAK-GENERATIVE CAPACITY OF SYNCHRONOUS TREE-ADJOINING GRAMMARS STUART M. SHIEBER Abstract. The formalism of synchronous tree-adjoining grammars, a variant of standard tree
Szabados, Barna
Synchronous Machines B. Szabados and U. Schaible McMaster University 1280 Main St. W., Hamilton, Ontario PM synchronous machine parameters in the high speed operating range. The theory and real interior PM synchronous machine at up to 8000 rpm. Results are presented which show a significant variation
Title of dissertation: SYNCHRONIZATION IN NETWORKS OF COUPLED OSCILLATORS
Anlage, Steven
ABSTRACT Title of dissertation: SYNCHRONIZATION IN NETWORKS OF COUPLED OSCILLATORS Juan Gabriel Restrepo, Doctor of Philosophy, 2005 Dissertation directed by: Professors Edward Ott and Brian Hunt with small degree and find that they cause the critical coupling strength to increase. #12;Dissertation
Emergence of nonuniform V-states by synchronization L. Friedland
Friedland, Lazar
Emergence of nonuniform V-states by synchronization L. Friedland Racah Institute of Physics, Hebrew nonuniform V-states can emerge in both free and bounded space by subjecting an axisymmetric vortex azimuthal symmetry. The cap- ture is followed by adiabatic deformation of the vortex boundary and emergence
Determination of Rotor Temperature for an Interior Permanent Magnet Synchronous
Noé, Reinhold
of the magnet material monitoring its temperature also helps to increase the accuracy of the estimated torque [1Determination of Rotor Temperature for an Interior Permanent Magnet Synchronous Machine Using@lea.upb.de, boecker@lea.upb.de Abstract--In this paper an enhanced method to de- termine the rotor temperature
Communication using Synchronization of Chaos in Semiconductor Lasers with optoelectronic
Illing, Lucas
Communication using Synchronization of Chaos in Semiconductor Lasers with optoelectronic feedback S Science, University of California, San Diego, La Jolla, CA 93093-0402, USA Abstract. A communication of GHz chaotic signals. We then test a proposed communication scheme by successfully transmitting
Clock distribution and synchronization in large digital systems
Hung, Tzu-Chien
1991-01-01T23:59:59.000Z
of this thesis is to present the analysis and the design of a new clock disl, ribution and synchronization networks for large digital systems. B. State of Current Research With the advance of the VLSI era, there has been a growing interest in exploring...
Position sensor for linear synchronous motors employing halbach arrays
Post, Richard Freeman
2014-12-23T23:59:59.000Z
A position sensor suitable for use in linear synchronous motor (LSM) drive systems employing Halbach arrays to create their magnetic fields is described. The system has several advantages over previously employed ones, especially in its simplicity and its freedom from being affected by weather conditions, accumulated dirt, or electrical interference from the LSM system itself.
Time Synchronization between SOKUIKI Sensor and Host Computer using Timestamps
Ohya, Akihisa
Time Synchronization between SOKUIKI Sensor and Host Computer using Timestamps Alexander Carballo, Yoshitaka Hara, Hirohiko Kawata, Tomoaki Yoshida, Akihisa Ohya and Shin'ichi Yuta Abstract-- Time is crucial of sensor readings. The SOKUIKI scanning laser range finder allows acquiring time values by timestamping
Time-synchronized Clustering of Gene Expression Trajectories
MĂĽller, Hans-Georg
Time-synchronized Clustering of Gene Expression Trajectories RONG TANG Division of Biostatistics, USA ABSTRACT Current clustering methods are routinely applied to gene expression time course data at different rates, successful clustering in this context requires dealing with varying time and shape patterns
Permanent magnet assisted synchronous reluctance motor, design and performance improvement
Niazi, Peyman
2006-04-12T23:59:59.000Z
with the design optimization of the Permanent Magnet Assisted Synchronous Reluctance Motor (PMa-SynRM). Various key points in the rotor design of a low cost PMa-SynRM are introduced and their effects are studied. Finite element approach has been utilized to show...
Formal Verification of Unreliable Failure Detectors in Partially Synchronous Systems
Mousavi, Mohammad
Formal Verification of Unreliable Failure Detectors in Partially Synchronous Systems M. Atif TU/Eindhoven Dept. of Computer Science P.O. Box 513, 5600 MB Eindhoven, The Netherlands m.atif@tue.nl M.R. Mousavi TU/Eindhoven Dept. of Computer Science P.O. Box 513, 5600 MB Eindhoven, The Netherlands m
Synchronous Programs Testing Language Mouna TKA Mnad1
Boyer, Edmond
approach, model-based testing, automatic test data generation. MOTS-CLÉS : tests de logiciels, approche (Jahier et al., 2006), Gatel (Marre, Blanc, 2005) and Lutess (Halbwachs et al., 1991) have been designed is to design a testing language that must be usable by non technical users. This "Synchronous Programs Testing
Synchronization in Multimedia Languages for Distributed Systems A. Guercio1
Bansal, Arvind K.
Synchronization in Multimedia Languages for Distributed Systems A. Guercio1 , A. Bansal2 , T. Arndt Introduction The rising popularity of multimedia content on the web has led to the development of special-purpose languages for multimedia authoring and presentations. Examples of such languages include SMIL [1], VRML [2
Wireless spread-spectrum telesensor chip with synchronous digital architecture
Smith, Stephen F.; Turner, Gary W.; Wintenberg, Alan L.; Emery, Michael Steven
2005-03-08T23:59:59.000Z
A fully integrated wireless spread-spectrum sensor incorporating all elements of an "intelligent" sensor on a single circuit chip is capable of telemetering data to a receiver. Synchronous control of all elements of the chip provides low-cost, low-noise, and highly robust data transmission, in turn enabling the use of low-cost monolithic receivers.
A Synchronization and Aggregate Communication Library for PAPERS Clusters
Dietz, Henry G. "Hank"
, the overriding concern in design and implementation of a public domain PAPERS support library has been to provide and the associated increases in latency. For this reason, the PAPERS library is based on the functionality of a veryA Synchronization and Aggregate Communication Library for PAPERS Clusters H. G. Dietz, T. M. Chung
Using Stoppable Clocks to Safely Interface Asynchronous and Synchronous Subsystems
Moore, Simon
of pipeline and often require a clock which is rarely stopped. This is in contrast to circuits which clock a single synchronous pipeline stage each time there is new input stimuli [2] which are simple extensions is to stretch the clock when there is a risk of metastability [1, 8, 10]. Since the clock has to be pausable, we
Zero-Safe Nets: Modeling Transactions via Transition Synchronization
Bruni, Roberto
Zero-Safe Nets: Modeling Transactions via Transition Synchronization Roberto Bruni and Ugo of the same zero-safe net. Zero-safe nets (ZS nets) have been introduced in [BM97] to provide a basic called stable places), ZS nets include a set of zero places. These are idealized resources that remain in
Semantic Synchronization in a Persistent Object System Library
Wolf, Alexander L.
constraints on a database, and the database management system (DBMS) synchronizes concurrent transactions transactions. Most commonly, a DBMS uses a two-phase locking protocol to enforce serializability. Each transaction requests locks according to the protocol, and the DBMS evaluates each request for con ict
Cryptanalyzing a discrete-time chaos synchronization secure communication system
Gonzalo Alvarez; Fausto Montoya; Miguel Romera; Gerardo Pastor
2003-11-21T23:59:59.000Z
This paper describes the security weakness of a recently proposed secure communication method based on discrete-time chaos synchronization. We show that the security is compromised even without precise knowledge of the chaotic system used. We also make many suggestions to improve its security in future versions.
Optimal Design of Synchronous Circuits Using Software Pipelining Techniques
Boyer, Michel
Computer Society Press, Los Alamitos, Calif., pp. 62-67. Author's addresses: F. R. Boyer, E. M. AboulhamidOptimal Design of Synchronous Circuits Using Software Pipelining Techniques FRANC¸OIS R. BOYER´eal and MICHEL BOYER Universit´e de Montr´eal We present a method to optimize clocked circuits by relocating
Nonlinear Electrical Simulation of High-Power Synchronous Generator System
Wu, Thomas
power density, the generator operates in nonlinear region of the magnetic circuit. Magnetic Finite for motor simulation [I]. Fardoun simulated permanent-magnet machine drive system using SPlCE [2]. NatarajanNonlinear Electrical Simulation of High-Power Synchronous Generator System Jie Chen and Thomas Wu
Hydrodynamic Flow Patterns and Synchronization of Beating Cilia Andrej Vilfan*
Jülicher, Frank
Hydrodynamic Flow Patterns and Synchronization of Beating Cilia Andrej Vilfan* J. Stefan Institute 2006) We calculate the hydrodynamic flow field generated far from a cilium which is attached to a surface and beats periodically. In the case of two beating cilia, hydrodynamic interactions can lead
Music Synchronization, Audio Matching, Pattern Detection, and User Interfaces
Clausen, Michael
Library System Dissertation zur Erlangung des Doktorgrades (Dr. rer. nat.) der Mathematisch Synchronization, Audio Matching, Pattern Detection, and User Interfaces for a Digital Music Library System Verena scale. For music documents these trends are observable as well, and by now several digital music
Ultra-Low Power Time Synchronization Using Passive Radio Receivers
Amir, Yair
Ultra-Low Power Time Synchronization Using Passive Radio Receivers Yin Chen Qiang Wang Marcus Chang. In this pa- per, we present an inexpensive and ultra-low power ( of elapsed seconds. The universal time sig- nal receiver combines an off-the-shelf radio chip with an ultra-low
The Complexity of Synchronous Notions of Information Flow Security
Paris-Sud XI, Université de
The Complexity of Synchronous Notions of Information Flow Security Franck Cassez1, , Ron van der flow security is concerned with the ability for agents in a system to deduce information about an information flow security policy has proved to be a subtle matter. A substantial literature has developed
A. Moujahid; A. D'Anjou; F. J. Torrealdea; C. Sarasola
2012-04-17T23:59:59.000Z
Many biological processes involve synchronization between nonequivalent systems, i.e, systems where the difference is limited to a rather small parameter mismatch. The maintenance of the synchronized regime in this cases is energetically costly \\cite{1}. This work studies the energy implications of synchronization phenomena in a pair of structurally flexible coupled neurons that interact through electrical coupling. We show that the forced synchronization between two nonidentical neurons creates appropriate conditions for an efficient actuation of adaptive laws able to make the neurons structurally approach their behaviours in order to decrease the flow of energy required to maintain the synchronization regime.
Moujahid, A; Torrealdea, F J; Sarasola, C; 10.1007/978-3-642-12433-4_77
2012-01-01T23:59:59.000Z
Many biological processes involve synchronization between nonequivalent systems, i.e, systems where the difference is limited to a rather small parameter mismatch. The maintenance of the synchronized regime in this cases is energetically costly \\cite{1}. This work studies the energy implications of synchronization phenomena in a pair of structurally flexible coupled neurons that interact through electrical coupling. We show that the forced synchronization between two nonidentical neurons creates appropriate conditions for an efficient actuation of adaptive laws able to make the neurons structurally approach their behaviours in order to decrease the flow of energy required to maintain the synchronization regime.
www.mmu.ac.uk/careers Careers & Employability Service
.mmu.ac.uk/careers Identifying courses · www.prospects.ac.uk/search_courses.htm · www.jobs.ac.uk · www.Findamasters.com · www.mmu.ac.uk/careers PG Professional/Vocational courses: Courses to allow you to enter certain professions Courses involve lectures for the first two terms then a research project for the final term (often finishing after
EESA: 802.11ac MU-MIMO spatial stream
Bahk, Saewoong
@snu.ac.kr EESA: Energy efficient spatial stream allocation technique in 802.11ac network Heo Jeong Ryun, Bahk Sae (1), (2) (1) . . spatial stream . 1 3. EESA(Energy Efficient 2014 EESA: 802.11ac MU-MIMO spatial stream , * jrheo@netlab.snu.ac.kr, sbahk
industrial robots, early synchronized control algorithms dealt with coordinating internal signals from
Andrew, Lachlan
MaxNet: Faster Flow Control Convergence Bartek P. Wydrowski, Lachlan L. H. Andrew, Iven M. Y of Melbourne, Vic, 3010, Australia Ph. +61 3 8344 3816 Fax. +61 3 8344 6678 Abstract. MaxNet is a distributed generates the congestion signal that controls the source rate. This is unlike SumNet networks
Shatani, Max Parker, Tyson Costa An Investigation into the AMS Sustainability Food Truck APSC 262 April 09 Investigation into the AMS Sustainability Food Truck Kenya Shatani Derek Schaper Tyson Costa Max Parker April 9 operations. The AMS at UBC wishes to design, build, and operate a fully sustainable food truck both on campus
Airborne MAX-DOAS measurements over California: Testing the NASA OMI tropospheric NO2 product
Airborne MAX-DOAS measurements over California: Testing the NASA OMI tropospheric NO2 product Hilke] Airborne Multi-AXis Differential Optical Absorption Spectroscopy (AMAX-DOAS) measurements of NO2 are compared to the NASA Ozone Monitoring Instrument (OMI) tropospheric vertical columns (data product v2
A Variable Leaky LMS Adaptive Algorithm Max Kamenetsky and Bernard Widrow
Widrow, Bernard
A Variable Leaky LMS Adaptive Algorithm Max Kamenetsky and Bernard Widrow ISL, Department (650) 723-4769 fax: +1 (650) 723-8473 Abstract--The LMS algorithm has found wide application in many ar- eas of adaptive signal processing and control. We introduce a variable leaky LMS algorithm, designed
Salmonella and tomatoes: Q & A for consumers1 Max Teplitski, Keith Schneider and Michelle Danyluk2
Burns, Jacqueline K.
SL263 Salmonella and tomatoes: Q & A for consumers1 Max Teplitski, Keith Schneider and Michelle sick. Typically, at least several thousand cells of Salmonella are required to cause salmonellosis in healthy adults (although one outbreak of salmonellosis resulted from consuming as few as four Salmonella
Large-Scale Patent Classification with Min-Max Modular Support Vector Machines
Lu, Bao-Liang
Large-Scale Patent Classification with Min-Max Modular Support Vector Machines Xiao-Lei Chu, Chao Ma, Jing Li, Bao-Liang Lu Senior Member, IEEE, Masao Utiyama, and Hitoshi Isahara Abstract-- Patent-world patent classification typically exceeds one million, and this number increases every year. An effective
Max-Weight Scheduling in Queueing Networks With Heavy-Tailed Traffic
Markakis, Mihalis G.
We consider the problem of scheduling in a single-hop switched network with a mix of heavy-tailed and light-tailed traffic and analyze the impact of heavy-tailed traffic on the performance of Max-Weight scheduling. As a ...
Efficient Cross-Layer Negotiation Max Planck Institute for Software Systems
Ford, Bryan
Efficient Cross-Layer Negotiation Bryan Ford Max Planck Institute for Software Systems baford toward a more evolvable Internet. 1. INTRODUCTION The Internet's power and generality rests on its archi-studied [4, 5, 16]. Layering connection-oriented protocols can also increase connection setup delay, however
Schwartz, Eric M.
A Centralized Associative Behavioral Robotic System Rolando Panez Max Makeev A. Antonio Arroyo Eric Laboratory University of Florida Abstract The implementation of swarm robotics is still in early stages of simplified swarm intelligence, between robots using the master/slave concept. This paper will give a brief
Beef Cow Management Survey USDA NAHMS 2007-2008 Max Irsik DVM, MAB
Watson, Craig A.
identification survey results (USDA NAHMS 2007-2008) Beef cow management practices Percent of Operations by typeBeef Cow Management Survey USDA NAHMS 2007-2008 Max Irsik DVM, MAB Beef Cattle Extension-calf operations. The Beef 2007-08 study focused on health and management practices on U.S. beef operations from 24
Phosphatidic acid activates a wound-activated MAPK in Glycine max
Hirt, Heribert
the alfalfa MAPK, SIMK. When PA production is inhibited with n-butanol, an inhibitor of phospholipase DPhosphatidic acid activates a wound-activated MAPK in Glycine max Sumin Lee1 , Heribert Hirt2 a systemic increase in phosphatidic acid (PA) levels after being wounded (Lee et al., 1997). To understand
MinMax Control of LQ Systems under the H1 Norm Constraint
Ito, Satoshi
** Abstract: Satisfactory optimal control of linear systems under the existence of disturÂ bance is studiedMinÂMax Control of LQ Systems under the H1 Norm Constraint Kiyotaka Shimizu* and Satoshi Ito. The satisfactory optimal control minimizes a quadratic maximalÂvalued objective functional subject to the H1 norm
Advanced Android Motion Detection App Number of teams you can accommodate: max 6
Reed, Nancy E.
Advanced Android Motion Detection App Number of teams you can accommodate: max 6 Number of students per team: 3-4 Industry Challenge Background The rapid rise of Android and iOS devices has made mobile to grow, many in the defense industry have started viewing Android-based devices as viable low
Computing Reliability Distributions of Windowed Max-log-map (MLM) Detectors : ISI Channels
Kavcic, Aleksandar
Computing Reliability Distributions of Windowed Max-log-map (MLM) Detectors : ISI Channels Fabian-log-map (MLM) detector has well-known appli- cations to the intersymbol interefence (ISI) channel [1, Â· Â· Â· , is trans- mitted across the ISI channel. Let the following random This work was performed when F. Lim
A Power-Law Formulation of Laminar Flow in Short Pipes Max Sherman
A Power-Law Formulation of Laminar Flow in Short Pipes Max Sherman Indoor Environment Program ABSTRACT This report develops a theoretical description of the hydrodynamic relationship based on a power pipes can be described with a simple power law dependence on pressure, but that the exponent
Improved Approximation Algorithms for the Min-max Tree Cover and Bounded Tree Cover Problems
Salavatipour, Mohammad R.
). In this paper we consider Min-Max k-Tree Cover Problem (MMkTC) and Bounded Tree Cover Problem (BTC) defined of the largest tree in the cover is minimized. In the Bounded Tree Cover problem (BTC), we are given the weight G
http://www.ecc.u-tokyo.ac.jp/doc/announce/newuser.html http://utroam.nc.u-tokyo.ac.jp/ [
Goda, Keisuke
OPAC TREEMyOPAC MyOPAC ()10 2 ECCS ECCS http://www.ecc.u-tokyo.ac.jp/doc/announce/newuser.html LAN LANutroam utroamECCS http://utroam.nc.u-tokyo.ac.jp/ [] ECCS http://www.dl.itc.u-tokyo.ac.jp/gacos/faq/gakugai.html http://www.dl.itc.u-tokyo.ac.jp/gacos/ http://www.dl.itc.u-tokyo.ac.jp/gacos/training.html https
Complex Dynamics and Synchronization of Delayed-Feedback Nonlinear Oscillators
Thomas E. Murphy; Adam B. Cohen; Bhargava Ravoori; Karl R. B. Schmitt; Anurag V. Setty; Francesco Sorrentino; Caitlin R. S. Williams; Edward Ott; Rajarshi Roy
2009-09-22T23:59:59.000Z
We describe a flexible and modular delayed-feedback nonlinear oscillator that is capable of generating a wide range of dynamical behaviours, from periodic oscillations to high-dimensional chaos. The oscillator uses electrooptic modulation and fibre-optic transmission, with feedback and filtering implemented through real-time digital-signal processing. We consider two such oscillators that are coupled to one another, and we identify the conditions under which they will synchronize. By examining the rates of divergence or convergence between two coupled oscillators, we quantify the maximum Lyapunov exponents or transverse Lyapunov exponents of the system, and we present an experimental method to determine these rates that does not require a mathematical model of the system. Finally, we demonstrate a new adaptive control method that keeps two oscillators synchronized even when the coupling between them is changing unpredictably.
Comparative analysis of existing models for power-grid synchronization
Nishikawa, Takashi
2015-01-01T23:59:59.000Z
The dynamics of power-grid networks is becoming an increasingly active area of research within the physics and network science communities. The results from such studies are typically insightful and illustrative, but are often based on simplifying assumptions that can be either difficult to assess or not fully justified for realistic applications. Here we perform a comprehensive comparative analysis of three leading models recently used to study synchronization dynamics in power-grid networks -- a fundamental problem of practical significance given that frequency synchronization of all power generators in the same interconnection is a necessary condition for a power grid to operate. We show that each of these models can be derived from first principles within a common framework based on the classical model of a generator, thereby clarifying all assumptions involved. This framework allows us to view power grids as complex networks of coupled second-order phase oscillators with both forcing and damping terms. U...
Optical synchronization system for femtosecond X-ray sources
Wilcox, Russell B. (El Cerrito, CA); Holzwarth, Ronald (Munich, DE)
2011-12-13T23:59:59.000Z
Femtosecond pump/probe experiments using short X-Ray and optical pulses require precise synchronization between 100 meter-10 km separated lasers in a various experiments. For stabilization in the hundred femtosecond range a CW laser is amplitude modulated at 1-10 GHz, the signal retroreflected from the far end, and the relative phase used to correct the transit time with various implementations. For the sub-10 fsec range the laser frequency itself is upshifted 55 MHz with an acousto-optical modulator, retroreflected, upshifted again and phase compared at the sending end to a 110 MHz reference. Initial experiments indicate less than 1 fsec timing jitter. To lock lasers in the sub-10 fs range two single-frequency lasers separated by several teraHertz will be lock to a master modelocked fiber laser, transmit the two frequencies over fiber, and lock two comb lines of a slave laser to these frequencies, thus synchronizing the two modelocked laser envelopes.
High-speed synchronous reluctance machine with minimized rotor losses
Hofmann, H.; Sanders, S.R.
2000-04-01T23:59:59.000Z
This paper presents a refined design of a high-speed synchronous reluctance machine with minimized eddy-current losses in the rotor. Design criteria are the ability of the rotor to withstand high speeds, ability to operate in vacuum, negligible zero-torque spinning losses, high reliability, high efficiency, and low manufacturing cost. The rotor of the synchronous reluctance machine consists of bonded sections of ferromagnetic and non-magnetic steels. Finite-element code, incorporating rotor rotation, has been developed in MATLAB that calculates steady-state eddy currents (and losses) in the rotor. A stator iron and stator winding have been designed to minimize rotor losses, and two such prototype machines have been fabricated. Experimental results show an efficiency of 91% at a 10-kW 10,000-r/min operating point, and rotor losses less than 0.5% of input power.
Apparatus, system, and method for synchronizing a timer key
Condit, Reston A; Daniels, Michael A; Clemens, Gregory P; Tomberlin, Eric S; Johnson, Joel A
2014-04-22T23:59:59.000Z
A timer key relating to monitoring a countdown time of a countdown routine of an electronic device is disclosed. The timer key comprises a processor configured to respond to a countdown time associated with operation of the electronic device, a display operably coupled with the processor, and a housing configured to house at least the processor. The housing has an associated structure configured to engage with the electronic device to share the countdown time between the electronic device and the timer key. The processor is configured to begin a countdown routine based at least in part on the countdown time, wherein the countdown routine is at least substantially synchronized with a countdown routine of the electronic device when the timer key is removed from the electronic device. A system and method for synchronizing countdown routines of a timer key and an electronic device are also disclosed.
Synchronization of Networked Jahn-Teller Systems in Circuit QED
Yusuf Gul
2014-12-29T23:59:59.000Z
We consider the nonlinear e?ects in Jahn-Teller system of two coupled resonators interacting simultaneously with ux qubit using Circuit QED. Two frequency description of Jahn Teller system that inherits the networked structure of both nonlinear Josephson Junctions and harmonic oscillators is employed to describe the synchronous structures in multifrequency scheme. Emergence of dominating mode is investigated to analyze frequency locking by eigenvalue spectrum. Rabi Supersplitting and asymmetry of side peaks in power spectrum is tuned for coupled and uncoupled synchronous con?gurations in terms of frequency entrainment switched by coupling strength between resonators. Second order coherence functions are employed to investigate self-sustained oscillations in resonator mode and qubit dephasing. Snychronous structure between correlations of priviledged mode and qubit is obtained in localization-delocalization and photon blockade regime controlled by the population imbalance.
Spontaneous synchronization driven by energy transport in interconnected networks
Vincenzo Nicosia; Per Sebastian Skardal; Vito Latora; Alex Arenas
2015-02-26T23:59:59.000Z
Understanding dynamical processes on networks is an important area of research in complex systems, with far reaching implications and applications in many real-world cases. Here we introduce and study a model of intertwined dynamics on interconnected networks, inspired by the human brain, which consists of bidirectionally coupled synchronization and energy transport processes. Remarkably, the proposed model allows the emergence of spontaneous switch-like synchronization transitions driven by the energy transport dynamics, which qualitatively mirror the transitions observed in human brain dynamics between resting-state and cognitive activity. We provide a steady-state analytical explanation for the observed behavior and show that the switch-like transition is robust over a wide range of model parameters and network topologies. Finally, we suggest that the complexity inherent in other interconnected dynamical processes might be responsible for various other emergent behaviors observed in natural systems.
Digital-data receiver synchronization method and apparatus
Smith, Stephen F.; Turner, Gary W.
2005-12-06T23:59:59.000Z
Digital-data receiver synchronization is provided with composite phase-frequency detectors, mutually cross-connected comparison feedback or both to provide robust reception of digital data signals. A single master clock may be used to provide frequency signals. Advantages can include fast lock-up time in moderately to severely noisy conditions, greater tolerance to noise and jitter when locked, and improved tolerance to clock asymmetries.
Digital-data receiver synchronization method and apparatus
Smith, Stephen F. (Loudon, TN) [Loudon, TN; Turner, Gary W. (Clinton, TN) [Clinton, TN
2009-09-08T23:59:59.000Z
Digital data receiver synchronization is provided with composite phase-frequency detectors, mutually cross-connected comparison feedback or both to provide robust reception of digital data signals. A single master clock can be used to provide frequency signals. Advantages can include fast lock-up time in moderately to severely noisy conditions, greater tolerance to noise and jitter when locked, and improved tolerance to clock asymmetries.
On chip clock synchronization for large digital systems
Brueske, Daniel
1994-01-01T23:59:59.000Z
the Substrate to the Metal Lines. . . 54 . . 55 . . 58 Figure 34. Substrate Noise. Figure 35. Noise Coupling into System. 59 , 60 Figure 36. Magnitude Frequency Response of Transfer Function H(f). Figure 37. Jitter Caused by Control Voltage Noise... at 61 Different Frequencies. Figure 38. Stabilized CSIDC . . 64 Figure 39. CSI Delay Cell and Stabilizing Capacitor Comparison. Figure 40. Synchronization with Noise Using CSIDC. Figure 41. Jitter Plots from HSPICE Data. Figure 42. Power Supply...
Laser synchronized high-speed shutter for spectroscopic application
Miles, Paul C. (Tracy, CA); Porter, Eldon L. (Tracy, CA); Prast, Thomas L. (Livermore, CA); Sunnarborg, Duane A. (Livermore, CA)
2002-01-01T23:59:59.000Z
A fast mechanical shutter, based on rotating chopper wheels, has been designed and implemented to shutter the entrance slit of a spectrograph. This device enables an exposure time of 9 .mu.s to be achieved for a 0.8 mm wide spectrograph entrance slit, achieves 100% transmission in the open state, and an essentially infinite extinction ratio. The device further incorporates chopper wheel position sensing electronics to permit the synchronous triggering of a laser source.
Complex network synchronization of chaotic systems with delay coupling
Theesar, S. Jeeva Sathya, E-mail: sjstheesar@gmail.com; Ratnavelu, K., E-mail: sjstheesar@gmail.com [Network Science Research Group, Institute of Mathematical Sciences, University of Malaya, 50603, Kuala Lumpur (Malaysia)
2014-03-05T23:59:59.000Z
The study of complex networks enables us to understand the collective behavior of the interconnected elements and provides vast real time applications from biology to laser dynamics. In this paper, synchronization of complex network of chaotic systems has been studied. Every identical node in the complex network is assumed to be in Lur’e system form. In particular, delayed coupling has been assumed along with identical sector bounded nonlinear systems which are interconnected over network topology.
LONG-TERM STABLE EQUILIBRIA FOR SYNCHRONOUS BINARY ASTEROIDS
Jacobson, Seth A. [Department of Astrophysical and Planetary Sciences, University of Colorado at Boulder, Boulder, CO 80309 (United States); Scheeres, Daniel J. [Department of Aerospace Engineering Sciences, University of Colorado at Boulder, Boulder, CO 80309 (United States)
2011-07-20T23:59:59.000Z
Synchronous binary asteroids may exist in a long-term stable equilibrium, where the opposing torques from mutual body tides and the binary YORP (BYORP) effect cancel. Interior of this equilibrium, mutual body tides are stronger than the BYORP effect and the mutual orbit semimajor axis expands to the equilibrium; outside of the equilibrium, the BYORP effect dominates the evolution and the system semimajor axis will contract to the equilibrium. If the observed population of small (0.1-10 km diameter) synchronous binaries are in static configurations that are no longer evolving, then this would be confirmed by a null result in the observational tests for the BYORP effect. The confirmed existence of this equilibrium combined with a shape model of the secondary of the system enables the direct study of asteroid geophysics through the tidal theory. The observed synchronous asteroid population cannot exist in this equilibrium if described by the canonical 'monolithic' geophysical model. The 'rubble pile' geophysical model proposed by Goldreich and Sari is sufficient, however it predicts a tidal Love number directly proportional to the radius of the asteroid, while the best fit to the data predicts a tidal Love number inversely proportional to the radius. This deviation from the canonical and Goldreich and Sari models motivates future study of asteroid geophysics. Ongoing BYORP detection campaigns will determine whether these systems are in an equilibrium, and future determination of secondary shapes will allow direct determination of asteroid geophysical parameters.
Experimental determination of equivalent circuit parameters for PM synchronous motors
Consoli, A.; Raciti, A. (Dept. Elettrico Elettronico e Sistemistico, Univ. di Catania, 95125 Catania (IT))
1992-01-01T23:59:59.000Z
The growing interest in energy savings, especially in industrial applications, has led to explore in more details the potential of unconventional excitation systems for electric machines. The wide spread use of Permanent Magnet materials in dc as well as in synchronous machines, to substitute the excitation circuit, is one of the ways followed to reach this objective. Significative work has been done in order to minimize the volume of the use permanent magnet material, to eliminate the motor behavior limitations due to the fixed value of excitation, to find the best geometries easy to manufacture and also reliable according to the dynamic stresses. A full procedure is presented in this paper to provide a straightforward tool useful for parameter determination of Permanent Magnet Synchronous Motors. Classical tests, that are well established to measure the parameters of synchronous machines with conventional field excitation, are reviewed to confirm or not their applicability. A novel test performed during particular transient conditions allows us to evaluate one of the concerned motor time constants. The motor behavior is simulated by means of a simulation language (ACSL) on a digital computer and several runs in different transient conditions are performed. Comparison of the simulated and experimental waveforms of speeds and currents shows good agreement and confirms the validity of the proposed procedure.
IEEE 802.11 PSM happy1024@cs.yonsei.ac.kr, kimthun@cs.yonsei.ac.kr, yang@cs.yonsei.ac.kr
Yang, Sung-Bong
2 P2P IEEE 802.11 PSM O, , happy1024@cs.yonsei.ac.kr, kimthun@cs.yonsei.ac.kr, yang@cs.yonsei.ac.kr An Effective Power Saving Mechanism for IEEE 802.11 PSM In Double-layered Mobile P2P Systems JuHee Lee, Taek IEEE 802.11 (PSM) . PSM Beacon Interval Sleep . , Sleep
Cell body rocking is a dominant mechanism for flagellar synchronization in a swimming algae
Geyer, Veikko; Howard, Jonathon; Friedrich, Benjamin M
2013-01-01T23:59:59.000Z
The unicellular green algae Chlamydomonas swims with two flagella, which can synchronize their beat. Synchronized beating is required to swim both fast and straight. A long-standing hypothesis proposes that synchronization of flagella results from hydrodynamic coupling, but the details are not understood. Here, we present realistic hydrodynamic computations and high-speed tracking experiments of swimming cells that show how a perturbation from the synchronized state causes rotational motion of the cell body. This rotation feeds back on the flagellar dynamics via hydrodynamic friction forces and rapidly restores the synchronized state in our theory. We calculate that this `cell body rocking' provides the dominant contribution to synchronization in swimming cells, whereas direct hydrodynamic interactions between the flagella contribute negligibly. We experimentally confirmed the coupling between flagellar beating and cell body rocking predicted by our theory. We propose that the interplay of flagellar beating a...
Validity of numerical trajectories in the synchronization transition of complex systems
R. L. Viana; C. Grebogi; S. E. de S. Pinto; S. R. Lopes; A. M. Batista; J. Kurths
2003-10-07T23:59:59.000Z
We investigate the relationship between the loss of synchronization and the onset of shadowing breakdown {\\it via} unstable dimension variability in complex systems. In the neighborhood of the critical transition to strongly non-hyperbolic behavior, the system undergoes on-off intermittency with respect to the synchronization state. There are potentially severe consequences of these facts on the validity of the computer-generated trajectories obtained from dynamical systems whose synchronization manifolds share the same non-hyperbolic properties.
Trade-offs and Issues in Traffic Synchronization Claus Gwiggner, Masato Fujita,
Gwiggner, Claus Peter
The International Civil Aviation Organization (ICAO) pro- poses several components of a modern ATM system is called `Traffic Synchronization'. It is described as the `tactical establishment and maintenance
Zero Lag Synchronization of Mutually Coupled Lasers in the Presence of Delays
Alexandra S. Landsman; Leah B. Shaw; Ira B. Schwartz
2007-11-05T23:59:59.000Z
We consider a line of three mutually coupled lasers with time delays and study chaotic synchronization of the outer lasers. Two different systems are presented: optoelectronically coupled semiconductor lasers and optically coupled fiber lasers. While the dynamics of the two systems are very different, robust synchronization of end lasers is obtained in both cases over a range of parameters. Here, we present analysis and numerical simulation to explain some of the observed synchronization phenomena. First, we introduce the system of three coupled semiconductor lasers and discuss the onset of oscillations that occurs via a bifurcation as the coupling strength increases. Next, we analyze the synchronization of the end lasers by examining the dynamics transverse to synchronized state. We prove that chaotic synchronization of the outer semiconductor lasers will occur for sufficiently long delays, and we make a comparison to generalized synchronization in driven dissipative systems. It is shown that the stability of synchronous state (as indicated by negative Lyupunov exponents transverse to the synchronization manifold) depends on the internal dissipation of the outer lasers. We next present numerical simulations for three coupled fiber lasers, highlighting some of the differences between the semiconductor and fiber laser systems. Due to the large number of coupled modes in fiber lasers, this is a good system for investigating spatio-temporal chaos. Stochastic noise is included in the fiber laser model, and synchrony of the outer lasers is observed even at very small coupling strengths.
Friedland, Lazar
Emergence and control of breather and plasma oscillations by synchronizing perturbations L frequency standing wave, while emergence of autoresonant breather oscillations requires driving
Isochronal synchronization of delay-coupled systems Ira B. Schwartz and Leah B. Shaw
Shaw, Leah B.
isochronally synchronized. Applications are shown for both incoherent pump-coupled lasers and spatiotemporal is found in coupled semiconductor lasers 10 . Cross- correlation statistics between the two intensities
SĂˇnchez, CĂ©sar
LOLA: Runtime Monitoring of Synchronous Systems Ben D'Angelo # Sriram Sankaranarayanan # Câ??esar S Department, Stanford University, Stanford, CA 94305 {bdangelo,srirams
SĂˇnchez, CĂ©sar
LOLA: Runtime Monitoring of Synchronous Systems Ben D'Angelo Sriram Sankaranarayanan CÂ´esar S, Stanford University, Stanford, CA 94305 {bdangelo,srirams
The Sunyaev-Zeldovich Signal of the maxBCG SDSS Galaxy Clusters in WMAP
Draper, Patrick [Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Dodelson, Scott [Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Hao, Jiangang [Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Rozo, Eduardo [Univ. of Chicago, Chicago, IL (United States)
2012-01-01T23:59:59.000Z
The Planck Collaboration measured the Sunyaev-Zel'dovich (SZ) decrement of optically selected clusters from the Sloan Digital Sky Survey, finding that it falls significantly below expectations based on existing mass calibration of the maxBCG galaxy clusters. Resolving this tension requires either the data to go up, or the theoretical expectations to come down. Here, we use data from the Wilkinson Microwave Anisotropy Probe (WMAP) to perform an independent estimate of the SZ decrement of maxBCG clusters. The recovered signal is consistent with that obtained using Planck, though with larger error bars due to WMAP's larger beam size and smaller frequency range. Nevertheless, this detection serves as an independent confirmation of the magnitude of the effect, and demonstrates that the observed discrepancy must be theoretical in origin.
Property:OpenEI/UtilityRate/EnergyRateStructure/Tier6Max | Open Energy
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaPLawrence County,1980) |NumberOfMeasuringStationsEnergyInformation Tier6Max Jump to: navigation,
Jagannathan
We investigate the asymptotic behavior of the steady-state queue length distribution under generalized max-weight scheduling in the presence of heavy-tailed traffic. We consider a system consisting of two parallel queues, ...
Using Synchronization for Prediction of High-Dimensional Chaotic Dynamics
Adam B. Cohen; Bhargava Ravoori; Thomas E. Murphy; Rajarshi Roy
2008-09-22T23:59:59.000Z
We experimentally observe the nonlinear dynamics of an optoelectronic time-delayed feedback loop designed for chaotic communication using commercial fiber optic links, and we simulate the system using delay differential equations. We show that synchronization of a numerical model to experimental measurements provides a new way to assimilate data and forecast the future of this time-delayed high-dimensional system. For this system, which has a feedback time delay of 22 ns, we show that one can predict the time series for up to several delay periods, when the dynamics is about 15 dimensional.
Synchronization and Collective Dynamics in a Carpet of Microfluidic Rotors
Nariya Uchida; Ramin Golestanian
2010-04-28T23:59:59.000Z
We study synchronization of an array of rotors on a substrate that are coupled by hydrodynamic interaction. The rotors that are modeled by an effective rigid body, are driven by an internal torque and exerts an active force on the surrounding fluid. The long-ranged nature of the hydrodynamic interaction between the rotors causes a rich pattern of dynamical behaviors including phase ordering and turbulent spiral waves. The model provides a novel example of coupled oscillators with long-range interaction. Our results suggest strategies for designing controllable microfluidic mixers using the emergent behavior of hydrodynamically coupled active components.
Synchronization of spin torque nano-oscillators through dipolar interactions
Chen, Hao-Hsuan, E-mail: d95222014@ntu.edu.tw; Wu, Jong-Ching, E-mail: phjcwu@cc.ncue.edu.tw; Horng, Lance [Department of Physics, National Changhua University of Education, Changhua 500, Taiwan (China); Lee, Ching-Ming [Graduate School of Materials Science, National Yunlin University of Science and Technology, Douliou, 64002, Taiwan (China); Chang, Ching-Ray, E-mail: crchang@phys.ntu.edu.tw; Chang, Jui-Hang [Department of Physics and Center for Quantum Sciences and Engineering, National Taiwan University, Taipei 10617, Taiwan (China)
2014-04-07T23:59:59.000Z
In an array of spin-torque nano-oscillators (STNOs) that combine a perpendicular polarized fixed layer with strong in-plane anisotropy in the free layers, magnetic dipolar interactions can effectively phase-lock the array, thus further enhancing the power of the output microwave signals. We perform a qualitative analysis of the synchronization of an array based on the Landau-Lifshitz-Gilbert equation, with a spin-transfer torque that assumes strong in-plane anisotropy. Finally, we present the numerical results for four coupled STNOs to provide further evidence for the proposed theory.
Fast and rewritable colloidal assembly via field synchronized particle swapping
Pietro Tierno; Tom H. Johansen; Thomas M. Fischer
2015-07-07T23:59:59.000Z
We report a technique to realize reconfigurable colloidal crystals by using the controlled motion of particle defects above an externally modulated magnetic substrate. The transport of particles is induced by applying a uniform rotating magnetic field to a ferrite garnet film characterized by a periodic lattice of magnetic bubbles. For filling factor larger than one colloid per bubble domain, the particle current arises from propagating defects where particles synchronously exchange their position when passing from one occupied domain to the next. The amplitude of an applied alternating magnetic field can be used to displace the excess particles via a swapping mechanism, or to mobilize the entire colloidal system at a predefined speed.
Global synchronization of parallel processors using clock pulse width modulation
Chen, Dong; Ellavsky, Matthew R.; Franke, Ross L.; Gara, Alan; Gooding, Thomas M.; Haring, Rudolf A.; Jeanson, Mark J.; Kopcsay, Gerard V.; Liebsch, Thomas A.; Littrell, Daniel; Ohmacht, Martin; Reed, Don D.; Schenck, Brandon E.; Swetz, Richard A.
2013-04-02T23:59:59.000Z
A circuit generates a global clock signal with a pulse width modification to synchronize processors in a parallel computing system. The circuit may include a hardware module and a clock splitter. The hardware module may generate a clock signal and performs a pulse width modification on the clock signal. The pulse width modification changes a pulse width within a clock period in the clock signal. The clock splitter may distribute the pulse width modified clock signal to a plurality of processors in the parallel computing system.
When tensor products of AC charges and Radon
Buczolich, Zoltán
When tensor products of AC #3; charges and Radon measures are AC #3; charges Zolt#19;an Buczolich and Radon measures. We show that if F is a charge in R m which is AC#3; in a locally BV set E and #22; is an absolutely continuous Radon measure on R n with locally bounded Radon-Nikodym derivative then the charge F
STATE OF CALIFORNIA DISTRIBUTED ENERGY STORAGE DX AC SYSTEMES ACCEPTANCE
STATE OF CALIFORNIA DISTRIBUTED ENERGY STORAGE DX AC SYSTEMES ACCEPTANCE CEC-MECH-14A (Revised 08/09) CALIFORNIA ENERGY COMMISSION CERTIFICATE OF ACCEPTANCE MECH-14A NA7.5.13 Distributed Energy Storage DX AC DISTRIBUTED ENERGY STORAGE DX AC SYSTEMES ACCEPTANCE CEC-MECH-14A (Revised 08/09) CALIFORNIA ENERGY COMMISSION
EXPERIMENTAL STUDY OF ELECTROLYTE DEPENDENCE OF AC ELECTROOSMOTIC PUMPS
Bazant, Martin Z.
EXPERIMENTAL STUDY OF ELECTROLYTE DEPENDENCE OF AC ELECTROOSMOTIC PUMPS Kapil Subramanian1 , John Abstract: Recent studies indicate increased efficiency of microfluidic ac electro-osmotic pumps of ac electroosmosis in microchannels on solution chemistry for the new fast aceo stepped pumps
Kumar, Punith V., E-mail: drvldayal@gmail.com; Manju, M. R., E-mail: drvldayal@gmail.com; Dayal, Vijaylakshmi, E-mail: drvldayal@gmail.com [Department of Physics, Maharaja Institute of Technology, Mysore-571438, Karnataka (India)
2014-04-24T23:59:59.000Z
We present a comprehensive study on origin of Spin Glass (SG) property in polycrystalline La{sub 0.5}Bi{sub 0.5}MnO{sub 3} perovskite oxide using linear and higher order ac susceptibility (?) measurements. The third order harmonic susceptibility (?{sub 3}) vs. temperature (K) with varying magnetic fields from 0.95 to 9.45 Oe and the divergence in their ?{sub 3} (max) allows us to infer the SG behavior occurring in the sample possibly due to co-operative freezing of the spins.
Using min-max of torque to resolve redundancy for a mobile manipulator
Reister, D.B.
1993-11-01T23:59:59.000Z
We have considered the problem of determining the time trajectories of the joint variables of a mobile manipulator with many redundant degrees of freedom that will minimize the maximum value of the torque during a large scale motion by the manipulator. To create a well defined problem, we will divide the problem into two components: path planner and surveyor. The path planner will choose a path (between two points in Cartesian space) that will minimize the maximum value of the torque along the path. The input to the path planner is a network of path segments with the maximum value of the torque on each segment. The surveyor will find the points in joint space that are local minimums for the maximum value of the torque at each Cartesian position and define the network of path segments. In this paper, our focus will be on the surveyor and not on the path planner. Our min-max problem has an extra constraint on the joint variables. We seek a min-max at each Cartesian position rather than a global min-max. We have used the Kuhn-Tucker conditions to derive necessary conditions for the solution of our min-max problem. We find that the necessary conditions require that at one or more of the joints the magnitude of the normalized torques will be equal to the min-max value. We have explored the torque surfaces for two mobile manipulators: a planar manipulator and the CESARm. The CESARm is a manipulator with three joint angles controlling the height of the arm. The paths with three equal torques have low values for the torque but they only cover part of the workspace and do not join together. Paths with two equal torques cover the workspace and bridge between the disjoint path segments. We have evaluated the necessary conditions for both the paths with three equal torques and the paths with two equal torques. In most cases, the paths satisfy the necessary conditions.
Distinctly Ambitious www.hw.ac.uk
Painter, Kevin
, Duncan Hand at the James Watt Institute for High Value Manufacturing led a team to apply laser-based manufacturing processes to the production of dental products. The project led to the development of a laserDistinctly Ambitious www.hw.ac.uk Laser Machining #12;Cutting-edge engineering technology for laser
Distinctly Ambitious www.hw.ac.uk
Painter, Kevin
, as energy is traded freely and consumption trends and technologies spread. The work helps BP and other largeDistinctly Ambitious www.hw.ac.uk BP - Global Energy Use: Statistical Review #12;Key personnel Prof of BP's Energy Outlook 2030, there is an ongoing need for a Statistical Review of global energy use
Four-Channel Differential AC Amplifier
Kleinfeld, David
to amplify cellular neurophysiological signals in applications requiring high gain, high input impedance, low://www.a-msystems.com General Description Instrument Features The Four-Channel Differential AC Amplifier Model 1700 is designed noise, high common-mode rejection, and powerline interference rejection. Typical applications include
AC Losses of Prototype HTS Transmission Cables
Demko, J.A.; Dresner, L.; Hughey, R.L.; Lue, J.W.; Olsen, S.K.; Sinha, U.; Tolbert, J.C.
1998-09-13T23:59:59.000Z
Since 1995 Southwire Company and Oak Ridge National Laboratory (ORNL) have jointly designed, built, and tested nine, l-m long, high temperature superconducting (HTS) transmission cable prototypes. This paper summarizes the AC loss measurements of five of the cables not reported elsewhere, and compares the losses with each other and with theory developed by Dresner. Losses were measured with both a calorimetric and an electrical technique. Because of the broad resistive transition of the HTS tapes, the cables can be operated stably beyond their critical currents. The AC losses were measured in this region as well as below critical currents. Dresner's theory takes into account the broad resistive transition of the HTS tapes and calculates the AC losses both below and above the critical current. The two sets of AC 10SS data agree with each other and with the theory quite welL In particular, at low currents of incomplete penetration, the loss data agree with the theoretical prediction of hysteresis loss based on only the outer two Iayers carrying the total current.
Collective Atomic Recoil Laser as a synchronization transition
J. Javaloyes; M. Perrin; A. Politi
2007-12-11T23:59:59.000Z
We consider here a model previously introduced to describe the collective behavior of an ensemble of cold atoms interacting with a coherent electromagnetic field. The atomic motion along the self-generated spatially-periodic force field can be interpreted as the rotation of a phase oscillator. This suggests a relationship with synchronization transitions occurring in globally coupled rotators. In fact, we show that whenever the field dynamics can be adiabatically eliminated, the model reduces to a self-consistent equation for the probability distribution of the atomic "phases". In this limit, there exists a formal equivalence with the Kuramoto model, though with important differences in the self-consistency conditions. Depending on the field-cavity detuning, we show that the onset of synchronized behavior may occur through either a first- or second-order phase transition. Furthermore, we find a secondary threshold, above which a periodic self-pulsing regime sets in, that is immediately followed by the unlocking of the forward-field frequency. At yet higher, but still experimentally meaningful, input intensities, irregular, chaotic oscillations may eventually appear. Finally, we derive a simpler model, involving only five scalar variables, which is able to reproduce the entire phenomenology exhibited by the original model.
Intermittent synchronization in a network of bursting neurons
Choongseok Park; Leonid L. Rubchinsky
2011-09-12T23:59:59.000Z
Synchronized oscillations in networks of inhibitory and excitatory coupled bursting neurons are common in a variety of neural systems from central pattern generators to human brain circuits. One example of the latter is the subcortical network of the basal ganglia, formed by excitatory and inhibitory bursters of the subthalamic nucleus and globus pallidus, involved in motor control and affected in Parkinson's disease. Recent experiments have demonstrated the intermittent nature of the phase-locking of neural activity in this network. Here we explore one potential mechanism to explain the intermittent phase-locking in a network. We simplify the network to obtain a model of two inhibitory coupled elements and explore its dynamics. We used geometric analysis and singular perturbation methods for dynamical systems to reduce the full model to a simpler set of equations. Mathematical analysis was completed using three slow variables with two different time scales. Intermittently synchronous oscillations are generated by overlapped spiking which crucially depends on the geometry of the slow phase plane and the interplay between slow variables as well as the strength of synapses. Two slow variables are responsible for the generation of activity patterns with overlapped spiking and the other slower variable enhances the robustness of an irregular and intermittent activity pattern. While the analyzed network and the explored mechanism of intermittent synchrony appear to be quite generic, the results of this analysis can be used to trace particular values of biophysical parameters (synaptic strength and parameters of calcium dynamics), which are known to be impacted in Parkinson's disease.
Boyer, Edmond
A Comparative Study of State Saving Mechanisms for Time Warp Synchronized Parallel Discrete Event of Technology SWEDEN Abstract The state saving mechanism constitutes an essential part of any system in which Synchronization mechanism. In this type of systems the state saving and restoration mechanism is essential
Fundamental Limits on Secure Clock Synchronization and Man-In-The-Middle Detection
be built, including routing protocols and more sophisticated heavyweight protocols. I. INTRODUCTION to conserve power. If synchronization is lost or tampered with in such systems, nodes may waste power waking up and transmitting at times when other nodes are asleep. Thus, secure clock synchronization
Boyer, Edmond
Trade Integration and Business Cycle Synchronization in the EMU: the Negative Eect of New Trade : 10.1007/s11079-014-9318-8 #12;Abstract This paper questions the impact of trade integration on business cycle synchronization in the EMU by distinguishing increase of existing trade flows (the intensive
Lai, Ying-Cheng
Phase clustering and transition to phase synchronization in a large number of coupled nonlinear received 22 November 2000; published 9 April 2001 The transition to phase synchronization in systems of average frequency marks the disappearance of one phase cluster 7 . In this Rapid Com- munication, we
Balanced optical-microwave phase detector for sub-femtosecond optical-RF synchronization
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Peng, Michael Y.; Kalaydzhyan, Aram; Kärtner, Franz X.
2014-10-23T23:59:59.000Z
We demonstrate that balanced optical-microwave phase detectors (BOMPD) are capable of optical-RF synchronization with sub-femtosecond residual timing jitter for large-scale timing distribution systems. RF-to-optical synchronization is achieved with a long-term stability of more »suppression ratio with potential improvement via DC offset adjustment.« less
Emergence and Control of Multiphase Nonlinear Waves by Synchronization L. Friedland1
Friedland, Lazar
Emergence and Control of Multiphase Nonlinear Waves by Synchronization L. Friedland1 and A. G 2003) Large amplitude multiphase solutions of the periodic Kortewegde Vries equation are excited multiphase self-locking of the system with eikonal-type perturbations. The synchronization of each phase
Passivity-based control of a wound-rotor synchronous Arnau D`oria-Cerezoa
Batlle, Carles
of using a WRSM in front of the permanent magnet synchronous motor (PMSM), is the ability to compensate rotor synchronous machine (WRSM) is used for generation and also for drive ap- plications [1]. In the generation case the field voltage is used to regulate the stator voltage, while for motor applications
Synchronous Dependency Insertion Grammars A Grammar Formalism for Syntax Based Statistical MT
Synchronous Dependency Insertion Grammars A Grammar Formalism for Syntax Based Statistical MT Yuan formalism specifically designed for syntax-based sta- tistical machine translation. The synchro- nous between lan- guages, which many other synchronous grammars are unable to model. A Depend- ency Insertion
Optimum Control for Interior Permanent Magnet Synchronous Motors (IPMSM) in Constant
Noé, Reinhold
Optimum Control for Interior Permanent Magnet Synchronous Motors (IPMSM) in Constant Torque and Electrical Drives, Paderborn, Germany Abstract--Interior Permanent Magnet Synchronous Motors (IPMSM) gain-power speed area. A widespread electrical machine used for this purpose is the Interior Permanent Magnet
AN ONLINE SYSTEM FOR SYNCHRONIZED PROCESSING OF VIDEO AND AUDIO SIGNALS
Amer, Aishy
AN ONLINE SYSTEM FOR SYNCHRONIZED PROCESSING OF VIDEO AND AUDIO SIGNALS Mary Mikhail Giovanni and processed sepa- rately. The signals are buffered and integrated and synchro- nized using a time processing, audio processing, signals integration, synchronized audio and video signals; time- stamping. 1
Real-Time Synchronization on Multiprocessors: To Block or Not to Block, to Suspend or Spin?
Anderson, James
of several multiprocessor real-time synchronization options; this study is directed at previously- proposed knowledge, the real-time synchronization options considered herein have never been empirically compared before on an actual testbed. Before continuing, let us examine the options available for real
Xiaofeng Wu; Guanrong Chen; Jianping Cai
2008-07-14T23:59:59.000Z
This paper provides a unified method for analyzing chaos synchronization of the generalized Lorenz systems. The considered synchronization scheme consists of identical master and slave generalized Lorenz systems coupled by linear state error variables. A sufficient synchronization criterion for a general linear state error feedback controller is rigorously proven by means of linearization and Lyapunov's direct methods. When a simple linear controller is used in the scheme, some easily implemented algebraic synchronization conditions are derived based on the upper and lower bounds of the master chaotic system. These criteria are further optimized to improve their sharpness. The optimized criteria are then applied to four typical generalized Lorenz systems, i.e. the classical Lorenz system, the Chen system, the Lv system and a unified chaotic system, obtaining precise corresponding synchronization conditions. The advantages of the new criteria are revealed by analytically and numerically comparing their sharpness with that of the known criteria existing in the literature.
Yong Xu; Hua Wang
2013-09-04T23:59:59.000Z
This paper is devoted to the problem of synchronization between fractional-order chaotic systems with Gaussian fluctuation by the method of fractional-order sliding mode control. A fractional integral (FI) sliding surface is proposed for synchronizing the uncertain fractional-order system, and then the sliding mode control technique is carried out to realize the synchronization of the given systems. One theorem about sliding mode controller is presented to prove the proposed controller can make the system synchronize. As a case study, the presented method is applied to the fractional-order Chen-L\\"u system as the drive-response dynamical system. Simulation results show a good performance of the proposed control approach in synchronizing the chaotic systems in presence of Gaussian noise.
Tolbert, Leon M.
machine, synchronous motors, torque. I. NOMENCLATURE BFE brushless field excitation IPMSM interiorAnalysis of Slanted Air-gap Structure of Interior Permanent Magnet Synchronous Motor with Brushless permanent magnet synchronous motor (IPMSM) for application in a hybrid electric vehicle. This unique slanted
Tolbert, Leon M.
OF IPMSM Below is the well-known electromagnetic torque equation for all synchronous machines: dqqd iip Permanent Magnet Synchronous Motor with Brushless Field Excitation Seong Taek Lee1,2 , Timothy A. Burress1 permanent magnet synchronous motor (IPMSM). The conventional two-axis IPMSM model is modified to include
Tolbert, Leon M.
magnet machine, synchronous motors, torque. I. NOMENCLATURE BFE brushless field excitation IPMSM interiorStudy of Various Slanted Air-gap Structures of Interior Permanent Magnet Synchronous Motor of the slanted air-gap structure of an interior permanent magnet synchronous motor with brushless field
Venkatasubramanian, Mani V.
. The approximation follows from an analysis of the fundamental equations describing synchronous machine models models. Index Terms--Synchronous machine models, power system dynamics, power system models, power system of the dynamic state variables of a synchronous machine connected to an arbitrary external network. The technique
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (MillionStructural Basis of5,:,, , ., ...,Zeller, UPitt workshop 12/06/12 1 Status33 -5
Endocytosis in soybean protoplasts and synchronous suspension cultures of soybean cells
Sui, Xiaomei
1994-01-01T23:59:59.000Z
The double phosphate starvation method for inducing cell division synchrony in suspension cultures was applied to a rapidly growing suspension culture of soybean (Glycine max (L.) Merr.) cells. The synchrony of the culture was confirmed by changes...
Max Tech and Beyond: Maximizing Appliance and Equipment Efficiency by Design
Desroches, Louis-Benoit; Garbesi, Karina
2011-07-20T23:59:59.000Z
It is well established that energy efficiency is most often the lowest cost approach to reducing national energy use and minimizing carbon emissions. National investments in energy efficiency to date have been highly cost-effective. The cumulative impacts (out to 2050) of residential energy efficiency standards are expected to have a benefit-to-cost ratio of 2.71:1. This project examined energy end-uses in the residential, commercial, and in some cases the industrial sectors. The scope is limited to appliances and equipment, and does not include building materials, building envelopes, and system designs. This scope is consistent with the scope of DOE's appliance standards program, although many products considered here are not currently subject to energy efficiency standards. How much energy could the United States save if the most efficient design options currently feasible were adopted universally? What design features could produce those savings? How would the savings from various technologies compare? With an eye toward identifying promising candidates and strategies for potential energy efficiency standards, the Max Tech and Beyond project aims to answer these questions. The analysis attempts to consolidate, in one document, the energy savings potential and design characteristics of best-on-market products, best-engineered products (i.e., hypothetical products produced using best-on-market components and technologies), and emerging technologies in research & development. As defined here, emerging technologies are fundamentally new and are as yet unproven in the market, although laboratory studies and/or emerging niche applications offer persuasive evidence of major energy-savings potential. The term 'max tech' is used to describe both best-engineered and emerging technologies (whichever appears to offer larger savings). Few best-on-market products currently qualify as max tech, since few apply all available best practices and components. The three primary analyses presented in this report are: Nevertheless, it is important to analyze best-on-market products, since data on truly max tech technologies are limited. (1) an analysis of the cross-cutting strategies most promising for reducing appliance and equipment energy use in the U.S.; (2) a macro-analysis of the U.S. energy-saving potential inherent in promising ultra-efficient appliance technologies; and (3) a product-level analysis of the energy-saving potential.
Index of /datasets/files/41/pub/PUBID8_0001/MaxTech
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP aCentrothermDepew,Independent Energy Solutions Jump to: navigation, search Name:Sim_1/MaxTech [ICO]
Min-max control design for large angle maneuvers of flexible spacecraft
Kim, Cheolho
1991-01-01T23:59:59.000Z
usiug the ICF approxiusation method is [M]J = (4. 7) Define the A[M] is 6[M] = e([i1~I] ? [M] J) 0 M, ] (4. 8) where e is the scaling factor to control the magnitude of A[M]. In this case, the state space fornr is z=Az+Bu (4. 9) where 0 I ? M... ( ber) gP Shankar P. Bhattacharyy (Member) Srinivas R. Vadali (Member) /Ye~- gc'g Walter E. Haisler (Head of Department) December 1991 ABSTRACT Min-Max Control Design for Large Angle Maneuvers of Flexible Spacecraft(December 1991) Cheolho I...
An Expectation-Maximization Method for Calibrating Synchronous Machine Models
Meng, Da; Zhou, Ning; Lu, Shuai; Lin, Guang
2013-07-21T23:59:59.000Z
The accuracy of a power system dynamic model is essential to its secure and efficient operation. Lower confidence in model accuracy usually leads to conservative operation and lowers asset usage. To improve model accuracy, this paper proposes an expectation-maximization (EM) method to calibrate the synchronous machine model using phasor measurement unit (PMU) data. First, an extended Kalman filter (EKF) is applied to estimate the dynamic states using measurement data. Then, the parameters are calculated based on the estimated states using maximum likelihood estimation (MLE) method. The EM method iterates over the preceding two steps to improve estimation accuracy. The proposed EM method’s performance is evaluated using a single-machine infinite bus system and compared with a method where both state and parameters are estimated using an EKF method. Sensitivity studies of the parameter calibration using EM method are also presented to show the robustness of the proposed method for different levels of measurement noise and initial parameter uncertainty.
Non-synchronous control of self-oscillating resonant converters
Glaser, John Stanley (Niskayuna, NY); Zane, Regan Andrew (Scotia, NY)
2002-01-01T23:59:59.000Z
A self-oscillating switching power converter has a controllable reactance including an active device connected to a reactive element, wherein the effective reactance of the reactance and the active device is controlled such that the control waveform for the active device is binary digital and is not synchronized with the switching converter output frequency. The active device is turned completely on and off at a frequency that is substantially greater than the maximum frequency imposed on the output terminals of the active device. The effect is to vary the average resistance across the active device output terminals, and thus the effective output reactance, thereby providing converter output control, while maintaining the response speed of the converter.
Synchronizing compute node time bases in a parallel computer
Chen, Dong; Faraj, Daniel A; Gooding, Thomas M; Heidelberger, Philip
2014-12-30T23:59:59.000Z
Synchronizing time bases in a parallel computer that includes compute nodes organized for data communications in a tree network, where one compute node is designated as a root, and, for each compute node: calculating data transmission latency from the root to the compute node; configuring a thread as a pulse waiter; initializing a wakeup unit; and performing a local barrier operation; upon each node completing the local barrier operation, entering, by all compute nodes, a global barrier operation; upon all nodes entering the global barrier operation, sending, to all the compute nodes, a pulse signal; and for each compute node upon receiving the pulse signal: waking, by the wakeup unit, the pulse waiter; setting a time base for the compute node equal to the data transmission latency between the root node and the compute node; and exiting the global barrier operation.
Deadlock Detection in Basic Models of MPI Synchronization Communication Programs
Liao, Ming-xue
2007-01-01T23:59:59.000Z
A model of MPI synchronization communication programs is presented and its three basic simplified models are also defined. A series of theorems and methods for deciding whether deadlocks will occur among the three models are given and proved strictly. These theories and methods for simple models' deadlock detection are the necessary base for real MPI program deadlock detection. The methods are based on a static analysis through programs and with runtime detection in necessary cases and they are able to determine before compiling whether it will be deadlocked for two of the three basic models. For another model, some deadlock cases can be found before compiling and others at runtime. Our theorems can be used to prove the correctness of currently popular MPI program deadlock detection algorithms. Our methods may decrease codes that those algorithms need to change to MPI source or profiling interface and may detects deadlocks ahead of program execution, thus the overheads can be reduced greatly.
Advanced synchronous luminescence imaging for chemical and medical diagnostics
Vo-Dinh, Tuan
2006-09-05T23:59:59.000Z
A diagnostic method and associated system includes the steps of exposing at least one sample location with excitation radiation through a single optical waveguide or a single optical waveguide bundle, wherein the sample emits emission radiation in response to the excitation radiation. The same single optical waveguide or the single optical waveguide bundle receives at least a portion of the emission radiation from the sample, thus providing co-registration of the excitation radiation and the emission radiation. The wavelength of the excitation radiation and emission radiation is synchronously scanned to produce a spectrum upon which an image can be formed. An increased emission signal is generated by the enhanced overlap of the excitation and emission focal volumes provided by co-registration of the excitation and emission signals thus increasing the sensitivity as well as decreasing the exposure time necessary to obtain an image.
ac-driven atomic quantum motor
A. V. Ponomarev; S. Denisov; P. Hanggi
2009-06-09T23:59:59.000Z
We invent an ac-driven quantum motor consisting of two different, interacting ultracold atoms placed into a ring-shaped optical lattice and submerged in a pulsating magnetic field. While the first atom carries a current, the second one serves as a quantum starter. For fixed zero-momentum initial conditions the asymptotic carrier velocity converges to a unique non-zero value. We also demonstrate that this quantum motor performs work against a constant load.
Abnormal Synchronizing Path of Delay-coupled Chaotic Oscillators on the Edge of Stability
Zhuo, Zhao; Fu, Zhong-Qian
2015-01-01T23:59:59.000Z
In this paper, the transition of synchronizing path of delay-coupled chaotic oscillators in a scale-free network is highlighted. Mainly, through the critical transmission delay makes chaotic oscillators be coupled on the edge of stability, we find that the transition of synchronizing path is \\emph{abnormal}, which is characterized by the following evidences: (a) synchronization process starts with low-degree rather than high-degree ones; (b) the high-degree nodes don't undertake the role of hub; (c) the synchronized subnetworks show a poor small-world property as a result of hubs absence; (d) the clustering synchronization behavior emerges even community structure is absent in the scale-free network. This abnormal synchronizing path suggests that the diverse synchronization behaviors occur in the same topology, which implies that the relationship between dynamics and structure of network is much more complicated than the common sense that the structure is the foundation of dynamics. Moreover, it also reveals ...
Synchronization and time shifts of dynamical patterns for mutually delay-coupled fiber ring lasers
L. B. Shaw; I. B. Schwartz; E. A. Rogers; R. Roy
2006-03-27T23:59:59.000Z
A pair of coupled erbium doped fiber ring lasers is used to explore the dynamics of coupled spatiotemporal systems. The lasers are mutually coupled with a coupling delay less than the cavity round-trip time. We study synchronization between the two lasers in the experiment and in a delay differential equation model of the system. Because the lasers are internally perturbed by spontaneous emission, we include a noise source in the model to obtain stochastic realizations of the deterministic equations. Both amplitude synchronization and phase synchronization are considered. We use the Hilbert transform to define the phase variable and compute phase synchronization. We find that synchronization increases with coupling strength in the experiment and the model. When the time series from two lasers are time-shifted in either direction by the delay time, approximately equal synchronization is frequently observed, so that a clear leader and follower cannot be identified. We define an algorithm to determine which laser leads the other when the synchronization is sufficiently different with one direction of time shift, and statistics of switches in leader and follower are studied. The frequency of switching between leader and follower increases with coupling strength, as might be expected since the lasers mutually influence each other more effectively with stronger coupling.
Bashir, Rashid
to such methods because it is a noncontact method of heating using microwave energy that is delivered directly000 ARTICLE pubs.acs.org/ac Silicon Field Effect Transistors as Dual-Use Sensor-Heater Hybrids Bobby Reddy, Jr demonstrate the temperature mediated applications of a previously proposed novel localized dielectric heating
Ohmacht, Martin
2014-09-09T23:59:59.000Z
In a multiprocessor system, a central memory synchronization module coordinates memory synchronization requests responsive to memory access requests in flight, a generation counter, and a reclaim pointer. The central module communicates via point-to-point communication. The module includes a global OR reduce tree for each memory access requesting device, for detecting memory access requests in flight. An interface unit is implemented associated with each processor requesting synchronization. The interface unit includes multiple generation completion detectors. The generation count and reclaim pointer do not pass one another.
Synchronization and an application of a novel fractional order King Cobra chaotic system
Muthukumar, P., E-mail: muthukumardgl@gmail.com; Balasubramaniam, P., E-mail: balugru@gmail.com [Department of Mathematics, Gandhigram Rural Institute?Deemed University, Gandhigram 624 302, Tamilnadu (India); Ratnavelu, K., E-mail: kuru052001@gmail.com [Faculty of Science, Institute of Mathematical Sciences, University of Malaya, 50603 Kuala Lumpur (Malaysia)
2014-09-01T23:59:59.000Z
In this paper, we design a new three dimensional King Cobra face shaped fractional order chaotic system. The multi-scale synchronization scheme of two fractional order chaotic systems is described. The necessary conditions for the multi-scale synchronization of two identical fractional order King Cobra chaotic systems are derived through feedback control. A new cryptosystem is proposed for an image encryption and decryption by using synchronized fractional order King Cobra chaotic systems with the supports of multiple cryptographic assumptions. The security of the proposed cryptosystem is analyzed by the well known algebraic attacks. Numerical simulations are given to show the effectiveness of the proposed theoretical results.
Multiple birth induction with FSH-LH in synchronized beef cattle
Burguera, Mario Heberto
1973-01-01T23:59:59.000Z
-synchronized group (FSH). The synchronization treatments, using a 3 x 18 mm pellet of 1&- acetoxy 11/ - methyl 19 ? norprogesterone, implanted in the ear of the animals, started either at day 12 of the cycle (Syn 12) or at day 16 (Syn 16). The implants were held.... Ulberg and Lindley (1960), looking for improvements on synchronization and fertility also reported on the effects of injecting various levels of estradiol benzoate 96 hours after the last injection of the 14 day period of daily progesterone treatment...
Guitton, A.; Joulain, A.; Thilly, L., E-mail: ludovic.thilly@univ-poitiers.fr [Institut Pprime, CNRS-University of Poitiers-ENSMA, SP2MI, 86962 Futuroscope (France); Van Petegem, S.; Tromas, C.; Van Swygenhoven, H. [Materials Science and Simulations, NUM/ASQ, CH5232 Villigen PSI (Switzerland)
2014-06-16T23:59:59.000Z
In situ compression tests combined with neutron diffraction were performed on Ti{sub 2}AlN MAX polycrystals with lamellar anisotropic microstructure: the diffraction peak evolution (position and profile) with applied stress reveals that lamellar grains parallel to compression axis remain elastic while lamellar grains perpendicular to compression plastify, both families being subjected to strong variations of heterogeneous strains (types II and III). We demonstrate that this behavior originates from the complex response of the very anisotropic lamellar microstructure and explains the observation of reversible hysteretic loops when cycling MAX polycrystals even in the elastic regime.
AUV {gslee, sbahk}@netlab.snu.ac.kr
Bahk, Saewoong
AUV , {gslee, sbahk}@netlab.snu.ac.kr Transmission Power Control in Cluster AUV (CH) AUV . 1 . 1. 2. 3 . AUV CH (Buoy
University Policy No.: AC1145 Classification: Academic and Students
Victoria, University of
University Policy No.: AC1145 Classification: Academic and Students Approving Authority, interdisciplinary programs, divisions, and the library) will undergo a review every five to seven years
University Policy No.: AC1150 Classification: Academic and Students
Victoria, University of
University Policy No.: AC1150 Classification: Academic and Students TEACHING, portfolios, references, library resources, laboratories and equipment) related to the subject matter
Asynchronous Bypass Channels Improving Performance for Multi-synchronous Network-on-chips
Jain, Tushar Naveen Kumar
2011-10-21T23:59:59.000Z
microarchitecture which offers superior performance versus typical synchroniz- ing router designs. Our approach features Asynchronous Bypass Channels (ABCs) at intermediate nodes thus avoiding synchronization delay. We also propose a new network topology and routing...
Deshpande, Yateendra Balkrishna
2014-12-15T23:59:59.000Z
A rotating synchronous electric machine design can be described to its entirety by a combination of 17 to 24 discrete and continuous parameters pertaining the geometry, material selection, and electrical loading. Determining ...
Joint sequence estimation and synchronization using wavelet pulses in a communication system
Wannasakwong, Marisa
1994-01-01T23:59:59.000Z
A new kind of baseband pulse is introduced in a receiver using nonsynchronized uniform samples. The pulse is an orthonormal wavelet generated by a discrete filter. Its performance is examined by applying a sequence estimation and synchronization...
Sensorless Speed Control of Permanent Magnet-Assisted Synchronous Reluctance Motor (PMa-SynRM)
Chakali, Anil K.
2011-02-22T23:59:59.000Z
magnet motor. Also due to its synchronous operation, sensorless rotational control is possible along with higher power factor and better efficiency compared to the induction motor (IM). Therefore, this thesis first deals with the implementation of a...
A real-time DSP GMSK modem with all-digital symbol synchronization
Lambert, Richard Paul
1998-01-01T23:59:59.000Z
In communication systems, a requirement of the receiver is to estimate symbol timing so that symbol decisions may be made at the instant of smallest intersymbol interference. Though there exist various analog techniques for synchronization...
Sensorless Speed Control of Permanent Magnet-Assisted Synchronous Reluctance Motor (PMa-SynRM)
Chakali, Anil K.
2011-02-22T23:59:59.000Z
magnet motor. Also due to its synchronous operation, sensorless rotational control is possible along with higher power factor and better efficiency compared to the induction motor (IM). Therefore, this thesis first deals with the implementation of a...
A New, Iterative, Synchronous-Response Algorithm for Analyzing the Morton Effect
Saha, Rohit
2012-02-14T23:59:59.000Z
the former instability. SISRA predicts both the synchronous response for the speed range of concern plus the speed where the response becomes divergent. SISRA is implemented in a Timochenko-beam-based finite-element rotordynamics software suite. SISRA...
A Comparison of Software and Hardware Synchronization Mechanisms for Distributed Shared Memory of traditional multiprocessors have included hardware support only for simple operations such as compare primitives in hardware. In particular, as part of maintaining data consistency, these architectures maintain
Chaudhari, Qasim Mahmood
2009-05-15T23:59:59.000Z
. This dissertation focuses on deriving e±cient estimators for the clock parameters of the network nodes for synchronization with the reference node and the estimators variance thresholds are obtained to lower bound the maximum achievable performance. For any general...
Cluster synchronization induced by one-node clusters in networks with asymmetric negative couplings
Zhang, Jianbao [School of Science, Hangzhou Dianzi University, Hangzhou 310018 (China)] [School of Science, Hangzhou Dianzi University, Hangzhou 310018 (China); Ma, Zhongjun, E-mail: mzj1234402@163.com [School of Mathematics and Computing Science, Guilin University of Electronic Technology, Guilin 541004 (China)] [School of Mathematics and Computing Science, Guilin University of Electronic Technology, Guilin 541004 (China); Zhang, Gang [College of Mathematics and Information Science, Hebei Normal University, Shijiazhuang 050024 (China)] [College of Mathematics and Information Science, Hebei Normal University, Shijiazhuang 050024 (China)
2013-12-15T23:59:59.000Z
This paper deals with the problem of cluster synchronization in networks with asymmetric negative couplings. By decomposing the coupling matrix into three matrices, and employing Lyapunov function method, sufficient conditions are derived for cluster synchronization. The conditions show that the couplings of multi-node clusters from one-node clusters have beneficial effects on cluster synchronization. Based on the effects of the one-node clusters, an effective and universal control scheme is put forward for the first time. The obtained results may help us better understand the relation between cluster synchronization and cluster structures of the networks. The validity of the control scheme is confirmed through two numerical simulations, in a network with no cluster structure and in a scale-free network.
Optical phase dynamics in mutually coupled diode laser systems exhibiting power synchronization
Vishwa Pal; Awadhesh Prasad; R Ghosh
2011-11-10T23:59:59.000Z
We probe the physical mechanism behind the known phenomenon of power synchronization of two diode lasers that are mutually coupled via their delayed optical fields. In a diode laser, the amplitude and the phase of the optical field are coupled by the so-called linewidth enhancement factor, $\\alpha$. In this work, we explore the role of optical phases of the electric fields in amplitude (and hence power) synchronization through $\\alpha$ in such mutually delay-coupled diode laser systems. Our numerical results show that the synchronization of optical phases drives the powers of lasers to synchronized death regimes. We also find that as $\\alpha$ varies for different diode lasers, the system goes through a sequence of in-phase amplitude-death states. Within the windows between successive amplitude-death regions, the cross-correlation between the field amplitudes exhibits a universal power-law behaviour with respect to $\\alpha$.
New advances in designing energy efficient time synchronization schemes for wireless sensor networks
Noh, Kyoung Lae
2009-05-15T23:59:59.000Z
Time synchronization in wireless sensor networks (WSNs) is essential and significant for maintaining data consistency, coordination, and performing other fundamental operations, such as power management, security, and localization. Energy efficiency...
Deshpande, Yateendra Balkrishna
2014-12-15T23:59:59.000Z
A rotating synchronous electric machine design can be described to its entirety by a combination of 17 to 24 discrete and continuous parameters pertaining the geometry, material selection, and electrical loading. Determining the performance...
Channel Modeling and Time Delay Estimation for Clock Synchronization Among Seaweb Nodes
Gagnon, P; Rice, J; Clark, G A
2012-07-08T23:59:59.000Z
From simulations, tracking of the impulse response is feasible. Potential to benefit other functions such as ranging between two nodes. Potential to combine the features of different protocols to create a new and more realistic clock-synchronization protocol.
Glutamate Receptors Mediate TTX-Resistant Synchronous Activity in the Rat Hippocampus
Strowbridge, Ben
. Strowbridge Department of Neurosciences, Case Western Reserve University, Cleveland, Ohio 44106 receptors Synchronized discharges, the hallmark of human epilepsy, can be induced readily in vitro; Schwartzkroin and Prince, 1978; Johnston and Brown, 1981; Wong and Traub, 1983). Experimental and theoretical
Noise reduction control strategy of a permanent magnet synchronous machine for vehicle applications
Doolittle, Randy Gene
2009-05-15T23:59:59.000Z
The purpose of this work was to investigate a permanent magnet synchronous machine which will be produced by an industry partner of the Institut für Stromrichtertechnik und Elektrische Antriebe (ISEA) an institute of the Rheinisch Westfälisch...
Transcriptome and Proteome Dynamics of a Light-Dark Synchronized Bacterial Cell Cycle
Chisholm, Sallie (Penny)
Growth of the ocean's most abundant primary producer, the cyanobacterium Prochlorococcus, is tightly synchronized to the natural 24-hour light-dark cycle. We sought to quantify the relationship between transcriptome and ...
Richards, James E., S.M. Massachusetts Institute of Technology
2010-01-01T23:59:59.000Z
The Army's Geospatial Enterprise (AGE) has an emerging identity and value proposition arising from the need to synchronize geospatial information activities across the Army in order to deliver value to military decision ...
New advances in designing energy efficient time synchronization schemes for wireless sensor networks
Noh, Kyoung Lae
2009-05-15T23:59:59.000Z
Time synchronization in wireless sensor networks (WSNs) is essential and significant for maintaining data consistency, coordination, and performing other fundamental operations, such as power management, security, and localization. Energy efficiency...
Joint sequence estimation and synchronization using wavelet pulses in a communication system
Wannasakwong, Marisa
1994-01-01T23:59:59.000Z
A new kind of baseband pulse is introduced in a receiver using nonsynchronized uniform samples. The pulse is an orthonormal wavelet generated by a discrete filter. Its performance is examined by applying a sequence estimation and synchronization...
Control and Synchronization of Chaotic Fractional-Order Coullet System via Active Controller
M. Shahiri T.; A. Ranjbar N.; R. Ghaderi; S. H. Hosseinnia; S. Momani
2012-06-12T23:59:59.000Z
In this paper, fractional order Coullet system is studied. An active control technique is applied to control this chaotic system. This type of controller is also applied to synchronize chaotic fractional-order systems in master-slave structure. The synchronization procedure is shown via simulation. The boundary of stability is obtained by both of theoretical analysis and simulation result. The numerical simulations show the effectiveness of the proposed controller.
G. Alvarez; L. Hernandez; J. Munoz; F. Montoya; Shujun Li
2005-06-27T23:59:59.000Z
This work analyzes the security weakness of a recently proposed communication method based on chaotic modulation and masking using synchronization of two chaotic systems with different orders. It is shown that its application to secure communication is unsafe, because it can be broken in two different ways, by high-pass filtering and by reduced order system synchronization, without knowing neither the system parameter values nor the system key.
Synchronizing carrier frequencies of co-channel amplitude-modulated broadcast
Smith, Stephen F. (London, TN); Moore, James A. (Powell, TN)
2007-05-15T23:59:59.000Z
Systems and methods are described for carrier-frequency synchronization for improved AM and TV broadcast reception. A method includes synchronizing a carrier frequency of a broadcast signal with a remote reference frequency. An apparatus includes a reference signal receiver; a phase comparator coupled to the reference signal receiver; a voltage controlled oscillator coupled to the phase comparator; and a radio frequency output coupled to the voltage controlled oscillator.
Smith, Stephen F.; Moore, James A.
2003-05-13T23:59:59.000Z
Systems and methods are described for carrier-frequency synchronization for improved AM and TV broadcast reception. A method includes synchronizing a carrier frequency of a broadcast signal with a remote reference frequency. An apparatus includes a reference signal receiver; a phase comparator coupled to the reference signal receiver; a voltage controlled oscillator coupled to the phase comparator; and a radio frequency output coupled to the voltage controlled oscillator.
AC power | Princeton Plasma Physics Lab
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) | SciTech Connect Journal Article:Technologies | BlandineDecember 2012 Tue,2015theLaboratoryPPPL inABINITiiAC power
Fast Sparsely Synchronized Brain Rhythms in A Scale-Free Neural Network
Kim, Sang-Yoon
2015-01-01T23:59:59.000Z
We consider a directed Barab\\'{a}si-Albert scale-free network model with symmetric preferential attachment with the same in- and out-degrees, and study emergence of sparsely synchronized rhythms for a fixed attachment degree in an inhibitory population of fast spiking Izhikevich interneurons. For a study on the fast sparsely synchronized rhythms, we fix $J$ (synaptic inhibition strength) at a sufficiently large value, and investigate the population states by increasing $D$ (noise intensity). For small $D$, full synchronization with the same population-rhythm frequency $f_p$ and mean firing rate (MFR) $f_i$ of individual neurons occurs, while for sufficiently large $D$ partial synchronization with $f_p > {\\langle f_i \\rangle}$ ($\\langle f_i \\rangle$: ensemble-averaged MFR) appears due to intermittent discharge of individual neurons; particularly, the case of $f_p > 4 {\\langle f_i \\rangle}$ is referred to as sparse synchronization. Only for the partial and sparse synchronization, MFRs and contributions of indiv...
California Profilograph - Bonus paid for less than 5" per mile. Max bonus is 103.5% for 2.9" PI or less and lift) - Bonus paid for 50 IRI or less, Max Bonus is $180 per 0.1 mile per lane for 35 or less IRI. 2
Min-max control design for large angle maneuvers of flexible spacecraft
Kim, Cheolho
1991-01-01T23:59:59.000Z
( ber) gP Shankar P. Bhattacharyy (Member) Srinivas R. Vadali (Member) /Ye~- gc'g Walter E. Haisler (Head of Department) December 1991 ABSTRACT Min-Max Control Design for Large Angle Maneuvers of Flexible Spacecraft(December 1991) Cheolho I...] ? S] C2 6, (2, 1. 10) 03 C]S2C3 + S3S] C]S2S] + C3S] C]C2 63 where C, = cos8, and S, = sin8, . Hence, o] = d];6, = (C2C3)61+ ( ? C2S3)62+ (S3)63 (2, 1. 11) For the convenience of notation, the permutation symbol e03 is used. 1 e;ic = 0 ? 1...
FNAL Booster intensity, extraction, and synchronization control for collider operation
Ducar, R.J.; Lackey, J.R.; Tawzer, S.R.
1987-03-01T23:59:59.000Z
Booster operation for collider physics is considerably different than for fixed target operation. Various scenarios for collider physics, machine studies, and P-Bar targeting may require that the intensity vary from 5E10 PPP to 3E12 PPP at a 15 Hertz machine cycle rate. In addition to the normal Booster single turn extraction mode, collider operations require that the Booster inject into the Main Ring a small number of beam bunches for coalescing into a single high intensity bunch. These bunches must be synchronized such that the center bunch arrives in the RF bucket which corresponds to the zero phase of the coalescing cavity. The system implemented has the ability to deliver a precise fraction of the available 84 Booster beam bunches to Main Ring or to the P-Bar Debuncher via the newly installed AP-4 beam line for tune-up and studies. It is required that all of the various intensity and extraction scenarios be accommodated with minimal operator intervention.
Non-linear power spectra in the synchronous gauge
Jai-chan Hwang; Hyerim Noh; Donghui Jeong; Jinn-Ouk Gong; Sang Gyu Biern
2014-08-20T23:59:59.000Z
We study the non-linear corrections to the matter and velocity power spectra in the synchronous gauge (SG). We consider the perturbations up to third order in a zero-pressure fluid in flat cosmological background, which is relevant for the non-linear growth of cosmic structure. As a result, we point out that the SG is an inappropriate coordinate choice when handling the non-linear growth of the large-scale structure. Although the equations in the SG happen to coincide with those in the comoving gauge (CG) to linear order, they differ from second order. In particular, the second order hydrodynamic equations in the the SG are apparently in the Lagrangian form, whereas those in the CG are in the Eulerian form. Thus, the non-linear power spectra naively presented in the original SG show strange behavior quite different from the result of the Newtonian theory even on sub-horizon scales. The power spectra in the SG show regularized behaviors only after we introduce convective terms in the second order so that the equations in two gauges coincide to the second order.
In-Depth Look at Ground Source Heat Pumps and Other Electric Loads in Two GreenMax Homes
Puttagunta, S.; Shapiro, C.
2012-04-01T23:59:59.000Z
CARB partnered with WPPI Energy to answer key research questions on in-field performance of ground-source heat pumps and LAMELs through extensive field monitoring at two WPPI GreenMax demonstration homes in Wisconsin. These two test home evaluations provided valuable data on the true in-field performance of various building mechanical systems and lighting, appliances, and miscellaneous loads (LAMELs).
Max Planck Institute for Biological Cybernetics, Tübingen, Germany VSS 2002, #18.3 ID501 Spatial: What are vestibular cues good for? MPI for Biological Cybernetics, Germany 2 "Voluntary" vs Cybernetics, Germany 3 Methods - Setup · Vestibular stimuli: 6 dof Motion Platform · Visual stimuli: LCD video
On the design of a 55 GHz Si/SiGe HBT frequency doubler operating close to f max
On the design of a 55 GHz Si/SiGe HBT frequency doubler operating close to f max S. Bruce, M. Kim. Abstract In this paper we present for the first time experimental results on a frequency doubler using a Si/SiGe GHz, for the Si/SiGe HBT, the conversion efficiency in a not completely optimised circuit was found
DETECTION OF HAIRLINE MANDIBULAR FRACTURE USING MAX-FLOW MIN-CUT AND KOLMOGOROV-SMIRNOV DISTANCE
Bhandarkar, Suchendra "Suchi" M.
DETECTION OF HAIRLINE MANDIBULAR FRACTURE USING MAX-FLOW MIN-CUT AND KOLMOGOROV-SMIRNOV DISTANCE. ABSTRACT The paper addresses a clinically challenging problem of hairline mandibular fracture detection from Computed Tomography (CT) images. A hairline fracture that has critical clinical importance, can
Dobler, Wolfgang
INTEGRAL EQUATIONS FOR KINEMATIC DYNAMO MODELS W. Dobler Max-Planck-Institut fÂ¨ur Aeronomie of the induction equation and boundary conditions at infinity into an integral equation. We show that the integral of integration by parts and shows that an arbitrary gradient can be added to or subtracted from j(x) 1 Address
Schniter, Philip
5782 IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 55, NO. 12, DECEMBER 2007 Max-SINR ISI-symbol/inter-car- rier interference (ISI/ICI) subject to orthogonal or biorthogonal constraints. In doubly dispersive channels, however, complete sup- pression of ISI/ICI is impossible, and the ISI/ICI pattern gener- ated
www.mmu.ac.uk/careers Careers & Employability Service
;www.mmu.ac.uk/careers Identifying courses · www.prospects.ac.uk/search_courses.htm · www: Courses to allow you to enter certain professions Courses that build your skills in a new area Examples · MRes (taught prep for further research) These usually involve lectures for the first two terms
www.swansea.ac.uk/artsandhumanities Arts and Humanities
Martin, Ralph R.
dissertation or design a research project of their own (with 10,000 word report) which draws on issues Email: rhys.jones@swansea.ac.uk www.swansea.ac.uk/mediastudies/admissions - The Potter Guide to Higher relations, humanities, social science, computer science or related background. Professionals interested
www.le.ac.uk/physics UNDERGRADUATE COURSES IN
Banaji,. Murad
www.le.ac.uk/physics UNDERGRADUATE COURSES IN Physics and Astronomy Department of Physics and Astronomy #12;www.le.ac.uk/physics-ug "The Leicester Department of Physics and Astronomy offers superb courses. Students get a broader exposure to different areas of physics and astronomy than is possible
Modeling, analysis and simulation of "AC inductor" based converters
for current sourcing applications, such as battery chargers, where differences between the average input.g. 2-8]. II. LARGE SIGNAL ANALYSIS OF THE "AC INDUCTOR" BASED CHARGERS To describe the behavior of AC inductor topologies, we first consider the non-isolated charger shown in Fig. 1. Isolation can be obtained
AC susceptibility studies of high-[Tc] superconductors
Lee, Chang-Young.
1993-01-01T23:59:59.000Z
In this thesis, the authors studied physical properties of various high-T[sub c] superconductors by means of the ac susceptibility technique. They present the physics of ac susceptibility from first principles without relying on any specific models. From this, they can explain some fundamental but interesting features of experimental results such as symmetry properties of the ac susceptibility and its harmonics with respect to dc magnetic field. By measuring ac hysteresis they were able to obtain lower critical fields which were compared with some theoretical predictions. They found that the results were consistent with the BCS theory with modified gap parameter. By measuring ac hysteresis of granular samples at ultra low magnetic fields, they revealed the Meissner state and obtained Josephson lower critical fields, which was also found to be in consistence with the BCS theory. They studied the critical state models in detail and obtained some useful equations which were used in analyzing magnetic field dependence of ac susceptibility. By comparing the equations with experimental results, they were able to perform quantitative analysis of some important physical parameters such as critical current density. From numerical calculations of ac susceptibility with the parameter values obtained by this procedure, they confirmed good agreement of theory with experimental data. They incorporated the theory of flux creep into the equation governing the steady state flux motion, from which they were able to explain the shift of ac susceptibility with operating frequency toward high temperatures. Through this study, quantitative results on the activation energy were obtained.
Soft switched high frequency ac-link converter
Balakrishnan, Anand Kumar
2009-05-15T23:59:59.000Z
of the load current, and consequently, the inverter operates in the six-step mode. 10 m Phase Controlled Rectifier Thyristor Based CSI Ldc Fig. 5. Six step current fed converter C. Ac-link converters High frequency ac-link converters havebeen suggested...
Bond graph models of electromechanical systems. The AC generator case
Batlle, Carles
to an AC generator, and the case of permanent magnets is also considered. The corresponding bond graphs in Section III, and Section IV discusses the permanent magnet case. Finally, Section V, statesBond graph models of electromechanical systems. The AC generator case Carles Batlle Department
Personal Web Archive: E-mail: waka@iplab.cs.tsukuba.ac.jp, {shizuki,jiro}@cs.tsukuba.ac.jp
Tanaka, Jiro
Personal Web Archive: Web E-mail: waka@iplab.cs.tsukuba.ac.jp, {shizuki,jiro}@cs.tsukuba.ac.jp Web Web Web Web Web Web Personal Web Archive Personal Web Archive: Support System for Browsing the Versions of Web Page Ryota WAKAMATSU Buntarou SHIZUKI Jiro TANAKA Graduate School of Systems
Safe-commutation principle for direct single-phase AC-AC converters for use in audio power
and G, expressed as very low total harmonic distortion + noise (THD+N) levels and supplemented. SIngle Conversion stage AMplifier (SICAM) is the next im- portant evolutionary step in designing-stage AC-AC audio power amplifiers. As compared with the bridge commutation with load current or source
B. Subash; V. K. Chandrasekar; M. Lakshmanan
2014-12-23T23:59:59.000Z
We demonstrate that the synchronization of an array of electrically coupled spin torque nano-oscillators (STNO) modelled by Landau-Lifshitz-Gilbert-Slonczewski (LLGS) equation can be enhanced appreciably in the presence of a common external microwave magnetic field. The applied microwave magnetic field stabilizes and enhances the regions of synchronization in the parameter space of our analysis, where the oscillators are exhibiting synchronized oscillations thereby emitting improved microwave power. To characterize the synchronized oscillations we have calculated the locking range in the domain of external source frequency.
Thomas Jüngling; Hartmut Benner; Hiroyuki Shirahama; Kazuhiro Fukushima
2011-06-22T23:59:59.000Z
Two identical chaotic oscillators that are mutually coupled via time delayed signals show very complex patterns of completely synchronized dynamics including stationary states and periodic as well as chaotic oscillations. We have experimentally observed these synchronized states in delay-coupled electronic circuits and have analyzed their stability by numerical simulations and analytical calculations. We found that the conditions for longitudinal and transversal stability largely exclude each other and prevent e.g. the synchronization of Pyragas-controlled orbits. Most striking is the observation of complete chaotic synchronization for large delay times, which should not be allowed in the given coupling scheme on the background of the actual paradigm.
Ye, Z.
2006-03-01T23:59:59.000Z
This report summarizes the study and development of new active anti-islanding control schemes for synchronous machine-based distributed generators, including engine generators and gas turbines.
Breuer, G D; Chow, J H; Lindh, C B; Miller, N W; Numrich, F H; Price, W W; Turner, A E; Whitney, R R
1982-09-01T23:59:59.000Z
Improved methods are needed to characterize ac system harmonic behavior for ac filter design for HVDC systems. The purpose of this General Electric Company RP1138 research is to evaluate the present filter design practice and to investigate methods for calculating system harmonic impedances. An overview of ac filter design for HVDC systems and a survey of literature related to filter design have been performed. Two methods for calculating system harmonic impedances have been investigated. In the measurement method, an instrumentation system for measuring system voltage and current has been assembled. Different schemes of using the measurements to calculate system harmonic impedances have been studied. In the analytical method, a procedure to include various operating conditions has been proposed. Computer programs for both methods have been prepared, and the results of the measurement and analytical methods analyzed. A conclusion of the project is that the measurement and analytical methods both provided reasonable results. There are correlations between the measured and analytical results for most harmonics, although there are discrepancies between the assumptions used in the two methods. A sensitivity approach has been proposed to further correlate the results. From the results of the analysis, it is recommended that both methods should be tested further. For the measurement method, more testing should be done to cover different system operating conditions. In the analytical method, more detailed models for representing system components should be studied. In addition, alternative statistical and sensitivity approaches should be attempted.
A new measure of phase synchronization for a pair of time series and seizure focus localization
Kaushik Majumdar
2006-12-22T23:59:59.000Z
Defining and measuring phase synchronization in a pair of nonlinear time series are highly nontrivial. This can be done with the help of Fourier transform, when it exists, for a pair of stored (hence stationary) signals. In a time series instantaneous phase is often defined with the help of Hilbert transform. In this paper phase of a time series has been defined with the help of Fourier transform. This gives rise to a deterministic method to detect phase synchronization in its most general form between a pair of time series. Since this is a stricter method than the statistical methods based on instantaneous phase, this can be used for lateralization and source localization of epileptic seizures with greater accuracy. Based on this method a novel measure of phase synchronization, called syn function, has been defined, which is capable of quantifying neural phase synchronization and asynchronization as important parameters of epileptic seizure dynamics. It has been shown that such a strict measure of phase synchronization has potential application in seizure focus localization from scalp electroencephalogram (EEG) data, without any knowledge of electrical conductivity of the head.
Control of synchronization in coupled neural systems by time-delayed feedback
Philipp Hoevel; Markus A. Dahlem; Eckehard Schoell
2008-09-04T23:59:59.000Z
We discuss the synchronization of coupled neurons which are modelled as FitzHugh-Nagumo systems. As smallest entity in a larger network, we focus on two diffusively coupled subsystems, which can be interpreted as two mutually interacting neural populations. Each system is prepared in the excitable regime and subject to independent random fluctuations. In order to modify their cooperative dynamics, we apply a local external stimulus in form of an extended time-delayed feedback loop that involves multiple delays weighted by a memory parameter and investigate if local control applied to a subsystem can allow one to steer the global cooperative dynamics. Depending on the choice of this new control parameter, we investigate different measures to quantify the influence on synchronization: ratio of interspike intervals, power spectrum, interspike interval distribution, and phase synchronization intervals. We show that the control method is more robust for increasing memory parameter.
The role of intermediaries in the synchronization of pulse-coupled oscillators
Rodrigo A. García; Nicolás Rubido; Arturo C. Marti; Cecilia Cabeza
2014-09-03T23:59:59.000Z
The role of intermediaries in the synchronization of small groups of light controlled oscillators (LCO) is addressed. A single LCO is a two-time-scale phase oscillator. When pulse-coupling two LCOs, the synchronization time decreases monotonously as the coupling strength increases, independent of the initial conditions and frequency detuning. In this work we study numerically the effects that a third LCO induces to the collective behavior of the system. We analyze the new system by dealing with directed heterogeneous couplings among the units. We report a novel and robust phenomenon, absent when coupling two LCOs, which consists of a discontinuous relationship between the synchronization time and coupling strength or initial conditions. The mechanism responsible for the appearance of such discontinuities is discussed.
Femtosecond all-optical synchronization of an X-ray free-electron laser
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Schulz, S.; Grguraš, I.; Behrens, C.; Bromberger, H.; Costello, J. T.; Czwalinna, M. K.; Felber, M.; Hoffmann, M. C.; Ilchen, M.; Liu, H. Y.; et al
2015-01-20T23:59:59.000Z
Many advanced applications of X-ray free-electron lasers require pulse durations and time resolutions of only a few femtoseconds. To generate these pulses and to apply them in time-resolved experiments, synchronization techniques that can simultaneously lock all independent components, including all accelerator modules and all external optical lasers, to better than the delivered free-electron laser pulse duration, are needed. Here we achieve all-optical synchronization at the soft X-ray free-electron laser FLASH and demonstrate facility-wide timing to better than 30 fs r.m.s. for 90 fs X-ray photon pulses. Crucially, our analysis indicates that the performance of this optical synchronization is limited primarilymore »by the free-electron laser pulse duration, and should naturally scale to the sub-10 femtosecond level with shorter X-ray pulses.« less
Emergence of zero-lag synchronization in generic mutually coupled chaotic systems
Meital Zigzag; Maria Butkovski; Anja Englert; Wolfgang Kinzel; Ido Kanter
2008-11-25T23:59:59.000Z
Zero-lag synchronization (ZLS) is achieved in a very restricted mutually coupled chaotic systems, where the delays of the self-coupling and the mutual coupling are identical or fulfil some restricted ratios. Using a set of multiple self-feedbacks we demonstrate both analytically and numerically that ZLS is achieved for a wide range of mutual delays. It indicates that ZLS can be achieved without the knowledge of the mutual distance between the communicating partners and has an important implication in the possible use of ZLS in communications networks as well as in the understanding of the emergence of such synchronization in the neuronal activities.
Wen Yu; Kevin B. Wood
2015-03-19T23:59:59.000Z
We study the dynamics of phase synchronization in growing populations of discrete phase oscillatory systems when the division process is coupled to the distribution of oscillator phases. Using mean field theory, linear stability analysis, and numerical simulations, we demonstrate that coupling between population growth and synchrony can lead to a wide range of dynamical behavior, including extinction of synchronized oscillations, the emergence of asynchronous states with unequal state (phase) distributions, bistability between oscillatory and asynchronous states or between two asynchronous states, a switch between continuous (supercritical) and discontinuous (subcritical) transitions, and modulation of the frequency of bulk oscillations.
Time Synchronization Attack in Smart Grid-Part I: Impact and Analysis
Zhang, Zhenghao; Dimitrovski, Aleksandar D; Li, Husheng
2012-01-01T23:59:59.000Z
Many operations in power grids, such as fault detection and event location estimation, depend on precise timing information. In this paper, a novel Time Synchronization Attack (TSA) is proposed to attack the timing information in smart grid. Since many applications in smart grid utilize synchronous measurements and most of the measurement devices are equipped with global positioning system (GPS) for precise timing, it is highly probable to attack the measurement system by spoofing the GPS. The effectiveness of TSA is demonstrated for three applications of phasor measurement unit (PMU) in smart grid, namely transmission line fault detection, voltage stability monitoring and event locationing. The validity of TSA is demonstrated by numerical simulations.
An integral manifold approach to reduced order dynamic modeling of synchronous machines
Sauer, P.W.; Ahmed-Zaid, S.; Kokotovic, P.V.
1988-02-01T23:59:59.000Z
The concept of integral manifolds is used to systematically create improved reduced order models of synchronous machines. The approach is illustrated through a detailed example of a single machine connected to an infinite bus. The example shows the advantages of the manifold approach and also clarifies several issues about reduced order models of synchronous machines. The basic objective of the method is to include the effects of more complex models without actually including the additional differential equations. This is illustrated by including the effects of stator transients and damper windings on the swing equation without including the differential equations.
A new method for determining the armature leakage reactance of synchronous machines
El-Serafi, A.M.; Wu, J. (Power Systems Research Group, Dept. of Electrical Engineering, Univ. of Saskatchewan, Saskatoon (CA))
1991-03-01T23:59:59.000Z
This paper presents a new method for determining the armature leakage reactance of synchronous machines. In this method, the terminal voltage/armature current characteristic with the machine unloaded and unexcited is needed together with the open-circuit characteristic of the machine. The armature leakage reactance is derived from these two curves using iterative technique. The armature leakage reactances of five synchronous machines of different designs are obtained using the proposed method. Their values are compared with those of the Potier reactance of these machines measured at various terminal voltages.
Synchronization efficiency in coupled stochastic oscillators: The role of connection topology
G. Reenaroy Devi; R. K. Brojen Singh; Ram Ramaswamy
2015-04-02T23:59:59.000Z
We study the efficiency of synchronization in ensembles of identical coupled stochastic oscillator systems. By deriving a chemical Langevin equation, we measure the rate at which the systems synchronize. The rate at which the difference in the Hilbert phases of the systems evolve provides a suitable order parameter, and a 2--dimensional recurrence plot further facilitates the analysis of stochastic synchrony. We find that a global mean--field coupling effects the most rapid approach to global synchrony, and that when the number of "information carrying" molecular species increases, the rate of synchrony increases. The Langevin analysis is complemented by numerical simulations.
Smith, Stephen F. (Loudon, TN) [Loudon, TN; Moore, James A. (Powell, TN) [Powell, TN
2009-09-08T23:59:59.000Z
Systems and methods are described for carrier phase synchronization for improved AM and TV broadcast reception. A method includes synchronizing the phase of a carrier frequency of a broadcast signal with the phase of a remote reference frequency. An apparatus includes a receiver to detect the phase of a reference signal; a phase comparator coupled to the reference signal-phase receiver; a voltage controlled oscillator coupled to the phase comparator; and a phase-controlled radio frequency output coupled to the voltage controlled oscillator.
Smith, Stephen F. (Loudon, TN); Moore, James A. (Powell, TN)
2011-02-01T23:59:59.000Z
Systems and methods are described for carrier phase synchronization for improved AM and TV broadcast reception. A method includes synchronizing the phase of a carrier frequency of a broadcast signal with the phase of a remote reference frequency. An apparatus includes a receiver to detect the phase of a reference signal; a phase comparator coupled to the reference signal-phase receiver; a voltage controlled oscillator coupled to the phase comparator; and a phase-controlled radio frequency output coupled to the voltage controlled oscillator.
An In-Depth Look at Ground Source Heat Pumps and Other Electric Loads in Two GreenMax Homes
Puttagunta, Srikanth [Consortium for Advanced Residential Buildings (CARB), Norwalk, CT (United States); Shapiro, Carl [Consortium for Advanced Residential Buildings (CARB), Norwalk, CT (United States)
2012-04-01T23:59:59.000Z
Building America research team Consortium for Advanced Residential Buildings (CARB) partnered with WPPI Energy to answer key research questions on in-field performance of ground-source heat pumps and lighting, appliance, and miscellaneous loads (LAMELs) through extensive field monitoring at two WPPI GreenMax demonstration homes in Wisconsin. These two test home evaluations provided valuable data on the true in-field performance of various building mechanical systems and LAMELs.
Jianping Cai; Mihua Ma; Xiaofeng Wu
2009-08-22T23:59:59.000Z
In this paper we investigate a master-slave synchronization scheme of two n-dimensional non-autonomous chaotic systems coupled by sinusoidal state error feedback control, where parameter mismatch exists between the external harmonic excitation of master system and that of slave one. A concept of synchronization with error bound is introduced due to parameter mismatch, and then the bounds of synchronization error are estimated analytically. Some synchronization criteria are firstly obtained in the form of matrix inequalities by the Lyapunov direct method, and then simplified into some algebraic inequalities by the Gerschgorin disc theorem. The relationship between the estimated synchronization error bound and system parameters reveals that the synchronization error can be controlled as small as possible by increasing the coupling strength or decreasing the magnitude of mismatch. A three-dimensional gyrostat system is chosen as an example to verify the effectiveness of these criteria, and the estimated synchronization error bounds are compared with the numerical error bounds. Both the theoretical and numerical results show that the present sinusoidal state error feedback control is effective for the synchronization. Numerical examples verify that the present control is robust against amplitude or phase mismatch.
M. Daniel Sweetlin; G. Sivaganesh
2015-05-05T23:59:59.000Z
In this paper we present numerical and analytical studies on the complete synchronization phenomena exhibited by unidirectionally coupled two variant of Murali-Lakshmanan-Chua circuits. The transition of the coupled system from an unsynchronized state to a state of complete synchronization under the influence of the coupling parameter is observed through phase portraits obtained numerically and analytically.
Fujimoto, Hiroshi
-magnet synchronous motor (PMSM), which is applied to a supercharger of an automotive engine. Although the motor restricts the motor terminal voltages and the fundamental operating frequency is as high as 2500 Hz, it is significant to pursue further reduction of the synchronous impedance in the motor, paying attention to its
Pota, Himanshu Roy
Comparative study on fault responses of synchronous generators and wind turbine generators using voltage sag and the slip on fault responses with the TSI between synchronous generators and wind turbine with the second order classical model of the generator and constant impedance load model. Under the structure
CS61C L23 Synchronous Digital Systems (1)! Garcia, Fall 2011 UCB! ! !Lecturer SOE Dan Garcia!
California at Irvine, University of
!! CS61C L23 Synchronous Digital Systems (2)! Garcia, Fall 2011 Â© UCB! New-School Machine StructuresCS61C L23 Synchronous Digital Systems (1)! Garcia, Fall 2011 Â© UCB! ! !Lecturer SOE Dan Garcia! ! !www.cs.berkeley.edu/~ddgarcia inst.eecs.berkeley.edu/~cs61c CS61C : Machine Structures Lecture 23
CS61C L23 Synchronous Digital Systems (1)! Garcia, Fall 2011 UCB! ! !Lecturer SOE Dan Garcia!
California at Irvine, University of
!! #12;CS61C L23 Synchronous Digital Systems (2)! Garcia, Fall 2011 Â© UCB! New-School MachineCS61C L23 Synchronous Digital Systems (1)! Garcia, Fall 2011 Â© UCB! ! !Lecturer SOE Dan Garcia! ! !www.cs.berkeley.edu/~ddgarcia inst.eecs.berkeley.edu/~cs61c CS61C : Machine Structures Lecture 23
Microfluidics {sjauh, btzhang}@bi.snu.ac.kr
Microfluidics {sjauh, btzhang}@bi.snu.ac.kr Solving Shortest Path Problems Using Microfluidics Sahng-Joon Auh and Byoung-Tak Zhang Biointelligence Lab, School of Computer Science and Engineering Seoul National University . microfluidics MEMS
Strongly nonlinear dynamics of electrolytes in large ac voltages
Hojgaard Olesen, Laurits
We study the response of a model microelectrochemical cell to a large ac voltage of frequency comparable to the inverse cell relaxation time. To bring out the basic physics, we consider the simplest possible model of a ...
November 2013 www.kent.ac.uk/library
Banaji,. Murad
November 2013 www.kent.ac.uk/library Information Services Templeman Library SCONUL Access scheme) to the Templeman Library. I am a registered member of the Sconul Access scheme and hold a valid card. If given ............................... ................................................................................................................ Home library
A Distributed Generation Control Architecture for Islanded AC Microgrids
Dominguez-Garcia, Alejandro
1 A Distributed Generation Control Architecture for Islanded AC Microgrids Stanton T. Cady, Student architecture for generation control in islanded microgrids, and illustrate the performance Member, IEEE Abstract In this paper, we propose a distributed architecture for generation control
Alameda-Contra Costa Transit District (AC Transit) Fuel Cell...
Broader source: Energy.gov (indexed) [DOE]
provides an evaluation of three prototype fuel cell-powered transit buses operating at AC Transit in Oakland, California, and six baseline diesel buses similar in design to the...
AEP (Central and SWEPCO)- Coolsaver A/C Tune Up
Broader source: Energy.gov [DOE]
Participating customers are eligible to receive a $75 coupon for use toward A/C and heat pump efficiency services performed as a result of the program’s tune-up analysis. Residential and small...
Sustainable Developmentwww.st-andrews.ac.uk/sasi
Brierley, Andrew
108 Sustainable Developmentwww.st-andrews.ac.uk/sasi Sustainable Development Degree options MSc (One Year) Coursework & 15,000-word Dissertation Sustainable Development MSc (Two Years) Coursework Sustainable Development Postgraduate Certificate (One Semester) Coursework Sustainable Development MRes (One
Cognitive Radio Network {swjang, sbahk}@netlab.snu.ac.kr
Bahk, Saewoong
2010 Cognitive Radio Network , , {swjang, sbahk}@netlab.snu.ac.kr Analysis of Average Opportunities in Cognitive Radio Networks Seowoo Jang, Saewoong Bahk INMC, EECS, Seoul National University Cognitive Radio Network . Primary user
Contract Number: DE-AC05-76RL01830 Modification M705
#12;#12;Contract Number: DE-AC05-76RL01830 Modification M705 #12;Contract Number: DE-AC05-76RL01830 Modification M705 #12;Contract Number: DE-AC05-76RL01830 Modification M705 #12;Contract Number: DE-AC05-76RL01830 Modification M705 #12;Contract Number: DE-AC05-76RL01830 Modification M705 #12;Contract Number: DE
Development of an AC Module System: Final Technical Report
Suparna Kadam; Miles Russell
2012-06-15T23:59:59.000Z
The GreenRay Inc. program focused on simplifying solar electricity and making it affordable and accessible to the mainstream population. This was accomplished by integrating a solar module, micro-inverter, mounting and monitoring into a reliable, 'plug and play' AC system for residential rooftops, offering the following advantages: (1) Reduced Cost: Reduction in installation labor with fewer components, faster mounting, faster wiring. (2) Maximized Energy Production: Each AC Module operates at its maximum, reducing overall losses from shading, mismatch, or module downtime. (3) Increased Safety. Electrical and fire safety experts agree that AC Modules have significant benefits, with no energized wiring or live connections during installation, maintenance or emergency conditions. (4) Simplified PV for a Broader Group of Installers. Dramatic simplification of design and installation of a solar power system, enabling faster and more efficient delivery of the product into the market through well-established, mainstream channels. This makes solar more accessible to the public. (5) Broadened the Rooftop Market: AC Modules enable solar for many homes that have shading, split roofs, or obstructions. In addition, due to the smaller building block size of 200W vs. 1000W, homeowners with budget limitations can start small and add to their systems over time. Through this DOE program GreenRay developed the all-in-one AC Module system with an integrated PV Module and microinverter, custom residential mounting and performance monitoring. Development efforts took the product from its initial concept, through prototypes, to a commercial product sold and deployed in the residential market. This pilot deployment has demonstrated the technical effectiveness of the AC Module system in meeting the needs and solving the problems of the residential market. While more expensive than the traditional central inverter systems at the pilot scale, the economics of AC Modules become more and more favorable as the product matures and is made in high volumes. GreenRay's early customers have been highly enthusiastic about the AC Module system benefits.
Kim, Sang-Yoon
2015-01-01T23:59:59.000Z
We consider a clustered network with small-world sub-networks of inhibitory fast spiking interneurons, and investigate the effect of inter-modular connection on emergence of fast sparsely synchronized rhythms by varying both the inter-modular coupling strength $J_{inter}$ and the average number of inter-modular links per interneuron $M_{syn}^{(inter)}$. In contrast to the case of non-clustered networks, two kinds of sparsely synchronized states such as modular and global synchronization are found. For the case of modular sparse synchronization, the population behavior reveals the modular structure, because the intra-modular dynamics of sub-networks make some mismatching. On the other hand, in the case of global sparse synchronization, the population behavior is globally identical, independently of the cluster structure, because the intra-modular dynamics of sub-networks make perfect matching. We introduce a realistic cross-correlation modularity measure, representing the matching-degree between the instantane...
Bahk, Saewoong
@netlab.snu.ac.kr Detection of Alien Piconet using Preamble Information Changwon Nam*, Jinyong Chung+, Yongsuk Kim+, Saewoong
http://www-cr.scphys.kyoto-u.ac.jp/gakubu/P6.html http://www-cr.scphys.kyoto-u.ac.jp/gakubu/P6.html
2011 P6 http://www-cr.scphys.kyoto-u.ac.jp/gakubu/P6.html web #12;http://www-cr.scphys.kyoto-u.ac.jp/gakubu/P6.html () ( #12;http://www-cr.scphys.kyoto-u.ac.jp/gakubu/P6.html X MeV X Astro-H 2013 TeV10m) #12;http://www-cr.scphys.kyoto-u.ac.jp/gakubu/P6.html 2010 ASTRO-H CCD X (2) () (2) (2
Sanders, Seth
-Speed Synchronous Reluctance Machine with Minimized Rotor Losses Heath Hofmann, Member, IEEE, and Seth R. Sanders reliability, high efficiency, and low manufacturing cost. The rotor of the synchronous reluctance machine must be taken to ensure low rotor losses. Because the machine is synchronous, the rotor ideally sees dc
Mi, Chunting "Chris"
salient pole synchronous machines with damping windings on the rotor surface, or induction motors Performance of Large Solid-Pole Synchronous Motors Using Equivalent Circuit Approach Chunting Chris Mi1 present a method of modeling the starting performance of large solid pole synchronous motors based
Phase synchronization and chaotic dynamics in Hebbian learned artificial recurrent neural networks
Molter, Colin
Phase synchronization and chaotic dynamics in Hebbian learned artificial recurrent neural networks: increasing the storing capacity of recurrent neural networks as much as possible and observing and studying Colin Molter, Utku Salihoglu and Hugues Bersini Laboratory of artificial intelligence IRIDIA cp194
Robust Transient Stabilization Problem for a Synchronous Generator in a Power Network
Paris-Sud XI, Université de
disturbance attenuation, large-scale systems, power systems control. 1 Introduction Power networks are among control algorithm is designed on the basis of a third order model of the synchronous machine: only two of dynamical models of increasing complexity). They have continuously increased in size, power and number
The Hamiltonian Mean Field model: effect of network structure on synchronization dynamics
Yogesh S. Virkar; Juan G. Restrepo; James D. Meiss
2015-03-16T23:59:59.000Z
The Hamiltonian Mean Field (HMF) model of coupled inertial, Hamiltonian rotors is a prototype for conservative dynamics in systems with long-range interactions. We consider the case where the interactions between the rotors are governed by a network described by a weighted adjacency matrix. By studying the linear stability of the incoherent state, we find that the transition to synchrony occurs at a coupling constant $K$ inversely proportional to the largest eigenvalue of the adjacency matrix. We derive a closed system of equations for a set of local order parameters and use these equations to study the effect of network heterogeneity on the synchronization of the rotors. We find that for values of $K$ just beyond the transition to synchronization the degree of synchronization is highly dependent on the network's heterogeneity, but that for large values of $K$ the degree of synchronization is robust to changes in the heterogeneity of the network's degree distribution. Our results are illustrated with numerical simulations on Erd\\"os-Renyi networks and networks with power-law degree distributions.
Damping Inter-Area Oscillations Using Static Synchronous Series Compensator (SSSC)
Chen, Zhe
. This paper analyses the influence of SSSC on power system small signal stability. A SSSC damping controller signal stability is the ability of the power system to maintain synchronism among generators under small System Stabilizers (PSS). However, in modern power systems, due to the connection of power grids in vast
Title of dissertation: DYNAMICS AND SYNCHRONIZATION OF NONLINEAR OSCILLATORS WITH TIME
Anlage, Steven
ABSTRACT Title of dissertation: DYNAMICS AND SYNCHRONIZATION OF NONLINEAR OSCILLATORS WITH TIME DELAYS: A STUDY WITH FIBER LASERS Anthony Lawrence Franz Doctor of Philosophy, 2007 Dissertation directed Dissertation submitted to the Faculty of the Graduate School of the University of Maryland, College Park
Synchronous Ultra-Wide Band Wireless Sensors Networks for oil and gas exploration
Savazzi, Stefano
Synchronous Ultra-Wide Band Wireless Sensors Networks for oil and gas exploration Stefano Savazzi1 of new oil and gas reservoir. Seismic exploration requires a large number (500 ÷ 2000 nodes, MAC and network layer to develop wireless sensors networks tailored for oil (and gas) exploration
Combining Retiming and Recycling to Optimize the Performance of Synchronous Circuits
Carloni, Luca
Combining Retiming and Recycling to Optimize the Performance of Synchronous Circuits Luca P, CA 94720-1772 Abstract Recycling was recently proposed as a system-level design tech- nique to facilitate the building of complex System-on-Chips (SOC) by assembling pre-designed components. Recycling
Hardware Implementation of a High Speed Self-Synchronizing Cipher Mode
Heys, Howard
in a communication channel. The mechanism of SCFB mode resembles output feedback (OFB) mode and cipher feedback (CFB) mode. However it has self synchronization that OFB mode does not and has higher efficiency than CFB@mun.ca cipher work as a stream cipher. Output Feedback (OFB) mode, Cipher Feedback (CFB) mode and Counter (CTR
Scheuermann, Peter
Clock synchronization for wireless sensor networks: a survey Bharath Sundararaman, Ugo Buy *, Ajay 2005; accepted 18 January 2005 Abstract Recent advances in micro-electromechanical (MEMS) technology have led to the development of small, low-cost, and low-power sensors. Wireless sensor networks (WSNs
The Synchronic Frame of Photospheric Magnetic Flux: The Improved Synoptic Frame
Zhao, Xuepu
of the middle panel). Because of the differential rotation of magnetic elements, the solar surface distribution: SYNCHRONIC FRAMES #12;2 Abstract. An iteration algorithm is developed to accurately invert Carrington from a synoptic chart do not cover the whole solar surface at any time within the period of one solar
Ventilation-Synchronous Magnetic Resonance Microscopy of Pulmonary Structure and Ventilation in
Ventilation-Synchronous Magnetic Resonance Microscopy of Pulmonary Structure and Ventilation helium (3 He) gas to acquire images that dem- onstrate pulmonary vasculature and ventilated airways of these structures relative to the less vascular surrounding tissues. A constant- flow ventilator was developed
Enderlein, Jörg
Dead-time optimized time-correlated photon counting instrument with synchronized, independent timing channels Michael Wahla and Hans-Jürgen Rahn PicoQuant GmbH, Rudower Chaussee 29, D-12489 Berlin December 2006; accepted 19 February 2007; published online 23 March 2007 Time-correlated single photon
Ohya, Akihisa
Time Synchronization between SOKUIKI Sensor and Host Computer using Timestamps Alexander CARBALLO Institute of Technology Abstract: Time is crucial in applications such as sensor data fusion, autonomous.0 protocol of SOKUIKI sensor allows acquiring time values by timestamping range readings. Our work consists
SAME 2001, November 15th A combinatorial logic block of a synchronous
Huss, Sorin A.
together with the generation of a request signal derived from a clock of the synchronous system are assumed to be stable during their respective setup- and hold-times, their outputs are assumed to be stable vector of static signals applied to a SRCMOS gate will result in either an increased power consumption
SAME 2001, November 15 th 2001 1 A combinatorial logic block of a synchronous
Huss, Sorin A.
data waves [5][6]. The control path is modelled with conjunction to the data path according to its together with the generation of a request signal derived from a clock of the synchronous system 2 are assumed to be stable during their respective setup and holdtimes, their outputs are assumed
Method and apparatus to debug an integrated circuit chip via synchronous clock stop and scan
Bellofatto, Ralph E. (Ridgefield, CT); Ellavsky, Matthew R. (Rochester, MN); Gara, Alan G. (Mount Kisco, NY); Giampapa, Mark E. (Irvington, NY); Gooding, Thomas M. (Rochester, MN); Haring, Rudolf A. (Cortlandt Manor, NY); Hehenberger, Lance G. (Leander, TX); Ohmacht, Martin (Yorktown Heights, NY)
2012-03-20T23:59:59.000Z
An apparatus and method for evaluating a state of an electronic or integrated circuit (IC), each IC including one or more processor elements for controlling operations of IC sub-units, and each the IC supporting multiple frequency clock domains. The method comprises: generating a synchronized set of enable signals in correspondence with one or more IC sub-units for starting operation of one or more IC sub-units according to a determined timing configuration; counting, in response to one signal of the synchronized set of enable signals, a number of main processor IC clock cycles; and, upon attaining a desired clock cycle number, generating a stop signal for each unique frequency clock domain to synchronously stop a functional clock for each respective frequency clock domain; and, upon synchronously stopping all on-chip functional clocks on all frequency clock domains in a deterministic fashion, scanning out data values at a desired IC chip state. The apparatus and methodology enables construction of a cycle-by-cycle view of any part of the state of a running IC chip, using a combination of on-chip circuitry and software.
Cancellation of TorqueRipple Due to Nonidealitiesof PermanentMagnet SynchronousMachine Drives
Chapman, Patrick
-magnet synchronous machines for canceling torque which could conceivablvreduce the cost. ripple and minimizing stator rectangular waveforms, accuracy of the torque equation. However, the results show due to stator inductance access to all motor torque [2.81, mis approach has been shown winding connections. These motors represent
Zhao Zhuo; Shimin Cai; Jie Zhang; Zhongqian Fu
2011-10-25T23:59:59.000Z
In the past decade, synchronization on complex networks has attracted increasing attentions from various research disciplines. Most previous works, however, focus only on the dynamic behaviors of synchronization process in the stable region, i.e., global synchronization. In this letter, we demonstrate that synchronization process on complex networks can efficiently reveal the substructures of networks when the coupling strength of chaotic oscillators is under the lower boundary of stable region. Both analytic and numerical results show that the nodes belonging to the same component in the hierarchical network are tightly clustered according to the Euclidean distances between the state vectors of the corresponding oscillators, and different levels of hierarchy can be systematically unfolded by gradually tuning the coupling strength. When the coupling strengths exceed the upper boundary of stable region, the hierarchy of the network cannot be recognized by this approach. Extensive simulations suggest that our method may provide a powerful tool to detect the hierarchical community structure of complex systems and deep insight into the relationship between structure and dynamics of complex systems.
Guo, Yi
coupling between the lasers [1][4]. General coupling topology has not been explored. The dynamics of each]. In the case of global coupling, the process of synchronization shows analogy to the process found tools in- spired by recent cooperative control advances. Examining the dynamic model of coupled
Synchronization and propagation of bursts in networks of coupled map neurons
Rey Juan Carlos, Universidad
Synchronization and propagation of bursts in networks of coupled map neurons Gouhei Tanakaa Institute of Physics. DOI: 10.1063/1.2148387 Some kinds of neurons are known to exhibit irregular bursting oscillations in response to a constant input cur- rent. Network behavior of such bursting neurons has been
Chung, Soon-Jo
, thereby yielding a smaller synchronization error than an uncoupled control law in the presence of bounded motions of multiple spacecraft in Earth's gravitational field. However, the elliptical trajec- tories with time delays. Fax & Murray6 considered a decentralized control law for networked vehicles, constructed
Sherwood, Tim
Addressing the Challenges of Synchronization/Communication and Debugging Support in Hardware component of ESL tools to simulate the hardware designs and software models concurrently. It helps of RTL memory from a software perspective. While cosimulation is fast compared to a complete hardware
How Yeast Cells Synchronize their Glycolytic Oscillations: A Perturbation Analytic Treatment
Bier, Martin
product. Some models pointed to product stimulation of the third enzyme in the pathwayHow Yeast Cells Synchronize their Glycolytic Oscillations: A Perturbation Analytic Treatment Martin at in terms of NADH fluorescence (Richard et al., 1993), heat production (Teusink et al., 1996a
A Nyquist criterion for synchronization in networks of heterogeneous linear systems
Como, Giacomo
@math.kth.se). Abstract: We study the synchronization of a set of SISO subsystems interconnected via a time not intersect a certain region defined by the spectrum of the interconnection matrix. The result is applied Communitys Seventh Framework Programme under agreement n. FP7-ICT-223866-FeedNetBack. possible for a set
Paris-Sud XI, Université de
updates for the mod- els inputs. An internal combustion engine, based on FMI for model exchange, is usedContext-based polynomial extrapolation and slackened synchronization for fast multi-core simulation by multi-core chips, calls for the parallelization of simulation. Simu- lation speed-ups are expected from
Synchronization and portfolio performance of threatened salmon Jonathan W. Moore1
LETTER Synchronization and portfolio performance of threatened salmon Jonathan W. Moore1 , Michelle Marine Fisheries Service, Seattle, WA 98110, USA 2 School of Aquatic and Fishery Sciences, University salmon decreased risk-adjusted portfolio performance (the ratio of port- folio productivity to variance
Antsaklis, Panos
Output Synchronization of Multi-Agent Systems with Event-Driven Communication: Communication Delay-Agent Systems with Event-Driven Communication: Communication Delay and Signal Quantization Han Yu, Student is an important extension of applying event-driven communication to control of multi-agent systems, especially
Breaking a secure communication scheme based on the phase synchronization of chaotic systems
G. Alvarez; F. Montoya; G. Pastor; M. Romera
2003-11-20T23:59:59.000Z
A security analysis of a recently proposed secure communication scheme based on the phase synchronization of chaotic systems is presented. It is shown that the system parameters directly determine the ciphertext waveform, hence it can be readily broken by parameter estimation of the ciphertext signal.
Synchronization and Communication with Chaotic Time-Delay Electronic Circuit Systems
Anlage, Steven
Synchronization and Communication with Chaotic Time-Delay Electronic Circuit Systems David T simulation. Circuit implementation of Mackey- Glass delayed system. #12;)( )(1 )()( tbx tx tax dt tdx n - -+ - = 2.0=a 1.0=b 10=n The Mackey-Glass System The Mackey-Glass mathematical model1: a delay differential
SYNCHRONIZATION AND TRANSIENT STABILITY IN POWER NETWORKS AND NON-UNIFORM KURAMOTO OSCILLATORS
Bullo, Francesco
between the power network model and a first-order model of coupled oscillators. Assuming overdamped will rely increasingly on renewables such as wind and solar power. Since these renewable power sourcesSYNCHRONIZATION AND TRANSIENT STABILITY IN POWER NETWORKS AND NON-UNIFORM KURAMOTO OSCILLATORS
Synchronization and Transient Stability in Power Networks and Non-Uniform Kuramoto Oscillators
Bullo, Francesco
between the power network model and a first-order model of coupled oscillators. Assuming overdamped increasingly on renewable energy sources, such as wind and solar power, which cause stochastic disturbancesSynchronization and Transient Stability in Power Networks and Non-Uniform Kuramoto Oscillators
Zha, Gecheng
INVESTIGATION OF A COMPRESSOR ROTOR NON-SYNCHRONOUS VIBRATION WITH AND WITHOUT FLUID) of a high speed multistage axial compressor using rigid blade and vibrating blade with fluid blades of a high-speed compressor showing the frequency lock-in near the 1st torsional mode (1T) during
Zha, Gecheng
Investigation of Non-synchronous Vibration Mechanism for a High Speed Axial Compressor Using compressor. DDES is a hybrid model for turbulence simulation, which uses RANS model within the wall boundary of the compressor occurs due to the rotating flow instability in the vicinity of the rotor tip at a stable operation
Noé, Reinhold
Control Realization for an Interior Permanent Magnet Synchronous Motor (IPMSM) in Automotive Drive, the Maximal Torque Per Current (MTPC) method provides appropriate results. The requested torque is generated higher drive efficiency. The requested torque is generated with a minimum of total losses, which
A new model of saturated synchronous machines for power system transient stability simulations
Tamura, J.; Takeda, I. [Kitami Inst. of Tech., Hokkaido (Japan)] [Kitami Inst. of Tech., Hokkaido (Japan)
1995-06-01T23:59:59.000Z
This paper presents a new method to express the main flux saturation in synchronous machines. In the new method, the saturation is expressed by auxiliary currents and unsaturated magnetizing inductances instead of the saturated inductances. The new model using the currents contains only constant coefficients defined in terms of the unsaturated magnetizing inductances.
Lemmon, Michael
a part of microgrids, are incorporated to improve power quality and reliability when disruptions happen of microgrids [13], together with oth- er generation, storage and load units. These microgrid- s are installedVoltage Stability and Frequency Synchronization of Weak Power Distribution Networks with Inverter
Synchronization Algorithms for Co-Simulation of Power Grid and Communication Networks
Ciraci, Selim; Daily, Jeffrey A.; Agarwal, Khushbu; Fuller, Jason C.; Marinovici, Laurentiu D.; Fisher, Andrew R.
2014-09-11T23:59:59.000Z
The ongoing modernization of power grids consists of integrating them with communication networks in order to achieve robust and resilient control of grid operations. To understand the operation of the new smart grid, one approach is to use simulation software. Unfortunately, current power grid simulators at best utilize inadequate approximations to simulate communication networks, if at all. Cooperative simulation of specialized power grid and communication network simulators promises to more accurately reproduce the interactions of real smart grid deployments. However, co-simulation is a challenging problem. A co-simulation must manage the exchange of informa- tion, including the synchronization of simulator clocks, between all simulators while maintaining adequate computational perfor- mance. This paper describes two new conservative algorithms for reducing the overhead of time synchronization, namely Active Set Conservative and Reactive Conservative. We provide a detailed analysis of their performance characteristics with respect to the current state of the art including both conservative and optimistic synchronization algorithms. In addition, we provide guidelines for selecting the appropriate synchronization algorithm based on the requirements of the co-simulation. The newly proposed algorithms are shown to achieve as much as 14% and 63% im- provement, respectively, over the existing conservative algorithm.
Synchronizing a sea-level jump, final Lake Agassiz drainage, and abrupt cooling 8200 years ago
Törnqvist, Torbjörn E.
Synchronizing a sea-level jump, final Lake Agassiz drainage, and abrupt cooling 8200 years ago Yong cooling that can be directly linked to a well-documented freshwater source with a temporal resolution has received extensive interest for a wide range of reasons, including its potential role in a future
A New, Iterative, Synchronous-Response Algorithm for Analyzing the Morton Effect
Saha, Rohit
2012-02-14T23:59:59.000Z
and backward orbit....................................................................................................28 Table 3 Bearing parameter variation with operating speed [11] ......................................37 Table 4 Tilting pad bearing... Effect can be found in De Jongh [8]. Experiments on Morton Effect De Jongh and Morton [9] experimentally verified divergent synchronous vibration motion in a centrifugal compressor due to differential temperature across the journal in tilting-pad...
System and method for determining stator winding resistance in an AC motor using motor drives
Lu, Bin; Habetler, Thomas G; Zhang, Pinjia
2013-02-26T23:59:59.000Z
A system and method for determining the stator winding resistance of AC motors is provided. The system includes an AC motor drive having an input connectable to an AC source and an output connectable to an input terminal of an AC motor, a pulse width modulation (PWM) converter having switches therein to control current flow and terminal voltages in the AC motor, and a control system connected to the PWM converter. The control system generates a command signal to cause the PWM converter to control an output of the AC motor drive corresponding to an input to the AC motor, selectively generates a modified command signal to cause the PWM converter to inject a DC signal into the output of the AC motor drive, and determines a stator winding resistance of the AC motor based on the DC signal of at least one of the voltage and current.
AC Loss Measurements on a 2G YBCO Coil
Rey, Christopher M [ORNL] [ORNL; Duckworth, Robert C [ORNL] [ORNL; Schwenterly, S W [ORNL] [ORNL
2011-01-01T23:59:59.000Z
The Oak Ridge National Laboratory (ORNL) is collaborating with Waukesha Electric Systems (WES) to continue development of HTS power transformers. For compatibility with the existing power grid, a commercially viable HTS transformer will have to operate at high voltages in the range of 138 kV and above, and will have to withstand 550-kV impulse voltages as well. Second-generation (2G) YBCO coated conductors will be required for an economically-competitive design. In order to adequately size the refrigeration system for these transformers, the ac loss of these HTS coils must be characterized. Electrical AC loss measurements were conducted on a prototype high voltage (HV) coil with co-wound stainless steel at 60 Hz in a liquid nitrogen bath using a lock-in amplifier technique. The prototype HV coil consisted of 26 continuous (without splice) single pancake coils concentrically centered on a stainless steel former. For ac loss measurement purposes, voltage tap pairs were soldered across each set of two single pancake coils so that a total of 13 separate voltage measurements could be made across the entire length of the coil. AC loss measurements were taken as a function of ac excitation current. Results show that the loss is primarily concentrated at the ends of the coil where the operating fraction of critical current is the highest and show a distinct difference in current scaling of the losses between low current and high current regimes.
Superconducting shielded core reactor with reduced AC losses
Cha, Yung S.; Hull, John R.
2006-04-04T23:59:59.000Z
A superconducting shielded core reactor (SSCR) operates as a passive device for limiting excessive AC current in a circuit operating at a high power level under a fault condition such as shorting. The SSCR includes a ferromagnetic core which may be either closed or open (with an air gap) and extends into and through a superconducting tube or superconducting rings arranged in a stacked array. First and second series connected copper coils each disposed about a portion of the iron core are connected to the circuit to be protected and are respectively wound inside and outside of the superconducting tube or rings. A large impedance is inserted into the circuit by the core when the shielding capability of the superconducting arrangement is exceeded by the applied magnetic field generated by the two coils under a fault condition to limit the AC current in the circuit. The proposed SSCR also affords reduced AC loss compared to conventional SSCRs under continuous normal operation.
List of Participants Brian Baptie British Geological Survey bbap@bgs.ac.uk
.ac.uk Nicola D'Agostino Istituto Nazionale Geofisica Vulcanologia dagostin@ingv.it Serena Davies 360 Production@bgs.ac.uk Guilio Selvaggi Istituto Nazionale Geofisica Vulcanologia selvaggi@ingv.it Alistair Sloan Earth Sciences
Docket No. EERE-2011-BT-NOA-0067 and RIN Number 1904-AC52 Ex...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
1-BT-NOA-0067 and RIN Number 1904-AC52 Ex parte Communication Docket No. EERE-2011-BT-NOA-0067 and RIN Number 1904-AC52 Ex parte Communication This memorandum for the record...
VOLTAGE COLLAPSE AND TRANSIENT ENERGY FUNCTION ANALYSES OF AC/DC SYSTEMS
Cańizares, Claudio A.
) transmission, classic ac generator dynamics with reactive flows, and volt- age and frequency dependent load are compared and used for calculating bus voltage profiles ("nose" curves) and collapse points on ac/dc systems
AVTA: GE Energy WattStation AC Level 2 Charging System Testing...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Energy WattStation AC Level 2 Charging System Testing Results AVTA: GE Energy WattStation AC Level 2 Charging System Testing Results The Vehicle Technologies Office's Advanced...
Phillips, Bren Andrew
2014-01-01T23:59:59.000Z
Subcooled flow boiling of water was experimentally investigated using high-speed video (HSV), infrared (IR) thermography, and particle image velocimetry (PIV) to generate a unique database of synchronized data. HSV allowed ...
Law, Justice and Regulation at UEA law-justice-regulation@uea.ac.uk
Everest, Graham R
.dewing@uea.ac.uk Ivan Diaz-Rainey (NBS) Regulation of energy and environmental markets http://www.uea.ac.uk/nbs/people/People/Academic/Ivan+Diaz- Rainey i.diaz-rainey@uea.ac.uk Catherine Wad- dams (NBS/CCP) Economic regulation, competition, energy1 Network on Law, Justice and Regulation at UEA law-justice-regulation@uea.ac.uk 21 October 2010
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connect@rhul.ac.uk Tuesday11 Royal Holloway Balkan Ensemble An energetic performance of Balkan music
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Nakamura, Iku
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Goda, Keisuke
://www.adm.u-tokyo.ac.jp/gakunai/office/anzenei sei/org/taisei.html [ HP] 2. UTCRIS 18 3 UTCRIS #12;https-1 HP http://www.esc.u-tokyo.ac.jp/haisui/index.html [HP] 5. 3-3 2 3 3 2 2 1,1- HP http://www.adm.u-tokyo.ac.jp/office/anzeneisei/admin/tokutei_kagaku.html [ HP] 6. 6 HP http://www.esc.u-tokyo.ac.jp/seihai/seihai.html
Seasonal change in the effect of field-aligned currents at synchronous orbit
McPherron, R.L.; Barfield, J.N.
1980-12-01T23:59:59.000Z
The expected signature of substorm field-aligned currents is described for synchronous satellites near 10 /sup 0/ magnetic latitudes. The main effect is a positive D perturbation premidnight and a negative D perturbation post-midnight. This behavior is illustrated for two substorms near the fall equinox. A second pair of substorms taken from winter solstice do not show the expected behavior. The absence of this effect in winter observations is verified statistically by superposed epoch analysis. A simple explanation of this behavior based on the geometry of the plane of magnetic symmetry is presented. During disturbed times at winter solstice a synchronous satellite nominally at 10 /sup 0/ magnetic latitude is effectively at the magnetic equator. This distortion of the magnetic equator must be considered in future models of the distrubed magnetospheric magnetic field.
Shunt-capacitor-assisted synchronization of oscillations in intrinsic Josephson junctions stack.
Martin, I.; Halasz, G. B.; Bulaevskii, L. N.; Koshelev, A. E.; Materials Science Division; LANL
2010-08-06T23:59:59.000Z
We show that a shunt capacitor, by coupling each Josephson junction to all the other junctions, stabilizes synchronized oscillations in an intrinsic Josephson junction stack biased by a dc current. This synchronization mechanism is similar to the previously discussed radiative coupling between junctions, however, it is not defined by the geometry of the stack. It is particularly important in crystals with smaller numbers of junctions (where the radiation coupling is weak), and is comparable with the effect of strong super-radiation in crystals with many junctions. The shunt also helps to enter the phase-locked regime in the beginning of the oscillations, after switching on the bias current. Furthermore, it may be used to tune radiation power, which drops as the shunt capacitance increases.
Phase synchronization of coupled bursting neurons and the generalized Kuramoto model
Fabiano A. S. Ferrari; Ricardo L. Viana; Sérgio R. Lopes; Ruedi Stoop
2015-02-13T23:59:59.000Z
Bursting neurons fire rapid sequences of action potential spikes followed by a quiescent period. The basic dynamical mechanism of bursting is the slow currents that modulate a fast spiking activity caused by rapid ionic currents. Minimal models of bursting neurons must include both effects. We considered one of these models and its relation with a generalized Kuramoto model, thanks to the definition of a geometrical phase for bursting and a corresponding frequency. We considered neuronal networks with different connection topologies and investigated the transition from a non-synchronized to a partially phase-synchronized state as the coupling strength is varied. The numerically determined critical coupling strength value for this transition to occur is compared with theoretical results valid for the generalized Kuramoto model.
Limited spatial region for synchronous beam-wave interactions in rotating mode resonators
Velazco, J.E. (Microwave Research Laboratory, Department of Electric and Computer Engineering, George Mason University, Fairfax, Virginia 22030 (United States)); Mako, F.M. (FM Technologies, Inc., Fairfax, Virginia 22032 (United States))
1993-11-29T23:59:59.000Z
An electron beam passing along an axisymmetric static magnetic field under the presence of circularly polarized electromagnetic fields, launched in a suitable rotating mode resonator, can propagate as a growing helix. This helix rotates temporally with an angular velocity equal to that of the cavity's rotating mode. When the axial magnetic field is adjusted to obtain matching between the electrons gyrofrequency and fields rotating frequency, the electrons maintain phase coherence with the wave during the interaction. Synchronous beam-wave interactions will be shown to be limited to a spatial region near the resonator axis. This limited synchronous region results from the rotating-wave phase velocity exceeding the velocity of the particle beam.
Reliable clock estimation using linear weighted fusion based on pairwise broadcast synchronization
Shi, Xin, E-mail: xinshih86029@gmail.com; Zhao, Xiangmo, E-mail: xinshih86029@gmail.com; Hui, Fei, E-mail: xinshih86029@gmail.com; Ma, Junyan, E-mail: xinshih86029@gmail.com; Yang, Lan, E-mail: xinshih86029@gmail.com [School of Information Engineering, Chang'an University, Xi'an City (China)
2014-10-06T23:59:59.000Z
Clock synchronization in wireless sensor networks (WSNs) has been studied extensively in recent years and many protocols are put forward based on the point of statistical signal processing, which is an effective way to optimize accuracy. However, the accuracy derived from the statistical data can be improved mainly by sufficient packets exchange, which will consume the limited power resources greatly. In this paper, a reliable clock estimation using linear weighted fusion based on pairwise broadcast synchronization is proposed to optimize sync accuracy without expending additional sync packets. As a contribution, a linear weighted fusion scheme for multiple clock deviations is constructed with the collaborative sensing of clock timestamp. And the fusion weight is defined by the covariance of sync errors for different clock deviations. Extensive simulation results show that the proposed approach can achieve better performance in terms of sync overhead and sync accuracy.
Sinkule, B.J.
1994-03-01T23:59:59.000Z
The Three Synchronizations Policy requires that the design, construction, and operation of a new factory, or an existing factory that expands or changes production processes, be synchronized with the design, construction and operation of appropriate waste treatment facilities. Under this policy, when a new factory is designed, wastewater treatment facilities must be included as part of the overall factory design: when the factory is constructed, the wastewater treatment facilities must be constructed along with construction of the production facilities; and finally, when the factory begins to operate, the waste treatment facilities must begin operation as well. This research includes case studies of wastewater treatment measures at sixteen factories in the Pearl River Delta Region of China. Implementation of the Three Synchronizations Policy is examined in detail for two of the factories: Fengfu Weaving and Dyeing Plant and Zhongguan Printing and Dyeing Plant. The results of this research suggest that the Three Synchronizations Policy has been an effective means of forcing new and renovated factories to comply with wastewater discharge standards, mainly because the Three Synchronizations Policy gives environmental protection bureaus authority to regulate at each step of a new industrial facility`s development. In practice, this authority has been exercised through formalizing the {open_quotes}synchronizations{close_quotes} into a management system with specific regulatory requirements, each of which requires EPB approval. EPBs ran stall operation by withholding its approval of certification of a factory`s wastewater treatment facilities; EPBs also use fines and limited time treatment orders to enforce the Three Synchronizations Policy. The research results demonstrate that the Three Synchronizations Policy was more important than the Pollutant Discharge Fee Program in motivating existing factories to build wastewater treatment facilities.
Yan Wang; Gerhard Heinzel; Karsten Danzmann
2014-09-10T23:59:59.000Z
In this paper, we describe a hybrid-extended Kalman filter algorithm to synchronize the clocks and to precisely determine the inter-spacecraft distances for space-based gravitational wave detectors, such as (e)LISA. According to the simulation, the algorithm has significantly improved the ranging accuracy and synchronized the clocks, making the phase-meter raw measurements qualified for time- delay interferometry algorithms.
Effect of High-Voltage Heterojunction Bipolar Transistor Collector Design on f(T) and f(MAX)
Ashby, C.I.H.; Baca, A.G.; Chang, P.C.; Hietala, V.M.
1999-03-02T23:59:59.000Z
High-speed InGaP/GaAs heterojunction bipolar transistors (HBTs) for high-voltage circuit applications have been investigated. In order to obtain ideal IV characteristics, a lightly doped (N{sub DC} = 7.5 x 10{sup 15} cm{sup {minus}3}) thick (W{sub C} = 3.5 {micro}m) layer of GaAs was used as the collector layer. The devices fabricated have shown breakdown voltage exceeding 65 V. Device operated at up to a 60V bias, which is the highest operating voltage reported up to date for single heterojunction HBTs. Peak {line_integral}{sub T} and {line_integral}{sub MAX} values of 18 GHz and 29 GHz, respectively, have been achieved on a device with emitter area of 4x 12.5 {micro}m{sup 2}. Both {line_integral}{sub T} and {line_integral}{sub Max} degrades with higher bias, which is related to the elongation of the collector depletion width.
Womac, Alisa Diane
2012-10-19T23:59:59.000Z
responses of SCN astrocytes to ATP and led to a dampening of clock gene expression rhythms as determined by PER2::LUC bioluminescence reporting in SCN astrocytes. v These data demonstrate that astrocytes of the mammalian SCN rhythmically release ATP... transmitter involved in local communication among astrocytes and between astrocytes and neurons, and its potential contribution in SCN cellular communication and synchrony was investigated. The data presented here implicate ATP as a synchronizing agent...
Broken Bar Detection in Synchronous Machines Based Wind Energy Conversion System
Rahimian, Mina Mashhadi
2012-10-19T23:59:59.000Z
-stationary conditions, the conventional signal processing methods such as FFT in Motor Current Signature Analysis (MCSA) do not work well. Under such conditions, the stator current can be analyzed by means of STFT and Gabor Spectrogram for detecting the bearing... on the magnetic field theory and the unbalanced multiphase circuits. It is found that due to the asymmetrical structure of damper winding, the left sideband component in the stator current spectrum of the synchronous machine during steady state asynchronous...
Analytical modeling of a new disc permanent magnet linear synchronous machine for electric vehicles
Liu, C.T.; Chen, J.W.; Su, K.S.
1999-09-01T23:59:59.000Z
This paper develops an analytical approach based on a qd0 reference frame model to analyze dynamic and steady state characteristics of disc permanent magnet linear synchronous machines (DPMLSMs). The established compact mathematical model can be more easily employed to analyze the system behavior and to design the controller. Superiority in operational electromagnetic characteristics of the proposed DPMLSM for electric vehicle (EV) applications is verified by both numerical simulations and experimental investigations.
Optimal current control strategies for surface-mounted permanent-magnet synchronous machine drives
Chapman, P.L.; Sudhoff, S.D.; Whitcomb, C.A.
1999-12-01T23:59:59.000Z
The current waveforms for optimal excitation of surface-mounted permanent-magnet synchronous machines are set forth. Four different modes are considered, involving varying degrees of minimization of rms current and torque ripple. The optimized waveforms are markedly different than the traditional sinusoidal or rectangular excitation schemes. Inclusion of cogging torque and arbitrary degree of torque ripple minimization generalize this work over that of previous authors. An experimental drive and a detailed computer simulation verify the proposed control schemes.
Endogeneity analysis of output synchronization in the current and prospective EMU
Arestis, Philip; Phelps, Peter
2015-01-01T23:59:59.000Z
that countries should consider carefully the costs and benefits of joining a currency area (Mundell, 1961). To the extent that it conveys information about the symmetry and transmission of shocks, business cycle synchronization remains a key indicator... groups of countries and not others, those with inadequate adjustment mechanisms may be pre-exposed to additional risks of rapid deterioration of fiscal and financial balance following large negative macroeconomic and financial shocks (Vieira and Vieira...
Method and system for controlling a synchronous machine over full operating range
Walters, James E. (Carmel, IN); Gunawan, Fani S. (Westfield, IN); Xue, Yanhong (Westfield, IN)
2002-01-01T23:59:59.000Z
System and method for controlling a synchronous machine are provided. The method allows for calculating a stator voltage index. The method further allows for relating the magnitude of the stator voltage index against a threshold voltage value. An offset signal is generated based on the results of the relating step. A respective state of operation of the machine is determined. The offset signal is processed based on the respective state of the machine.
http://www.up.ac.za/academic/fabi/tpcp/pamphlets/phytophthora.htm PHYTOPHTHORA ROOT AND COLLAR
http://www.up.ac.za/academic/fabi/tpcp/pamphlets/phytophthora.htm PHYTOPHTHORA ROOT AND COLLAR ROT cold weather the fungus survives as oospores, chlamydospores http://www.up.ac.za/academic/fabi/tpcp/pamphlets/phytophthora.htm (1 of 4) [2002/02/26 01:54:52] #12;http://www.up.ac.za/academic/fabi/tpcp/pamphlets
http://www.up.ac.za/academic/fabi/tpcp/pamphlets/dothistroma.htm DOTHISTROMA NEEDLE BLIGHT
http://www.up.ac.za/academic/fabi/tpcp/pamphlets/dothistroma.htm DOTHISTROMA NEEDLE BLIGHT is necessary and routinely applied. At present, the disease is not http://www.up.ac.za/academic/fabi/tpcp/pamphlets/dothistroma.htm (1 of 2) [2002/02/26 01:53:43] #12;http://www.up.ac.za/academic/fabi/tpcp/pamphlets
http://www.up.ac.za/academic/fabi/tpcp/pamphlets/mycosphaerella.htm MYCOSPHAERELLA
http://www.up.ac.za/academic/fabi/tpcp/pamphlets/mycosphaerella.htm MYCOSPHAERELLA LEAF DISEASES leaf blotch develop adult leaves rapidly and are not seriously http://www.up.ac.za/academic/fabi/tpcp/pamphlets/mycosphaerella.htm (1 of 3) [2002/02/26 01:54:11] #12;http://www.up.ac.za/academic/fabi/tpcp/pamphlets
http://www.up.ac.za/academic/fabi/tpcp/pamphlets/coniothyrium.htm CONIOTHYRIUM CANKER OF
http://www.up.ac.za/academic/fabi/tpcp/pamphlets/coniothyrium.htm CONIOTHYRIUM CANKER OF EUCALYPTUS risk areas. Coniothyrium canker and spores of the fungus. http://www.up.ac.za/academic/fabi/tpcp/pamphlets/coniothyrium.htm (1 of 2) [2002/02/26 01:49:46] #12;http://www.up.ac.za/academic/fabi/tpcp/pamphlets
AC Losses in the MICE Channel Magnets -- Is This a Curse or aBlessing?
Green, M.A.; Wu, H.; Wang, L.; Kai, L.L.; Jia, L.X.; Yang, S.Q.
2008-01-31T23:59:59.000Z
This report discusses the AC losses in the MICE channelmagnets during magnet charging and discharging. This report talks aboutthe three types of AC losses in the MICE magnets; the hysteretic AC lossin the superconductor, the coupling AC loss in the superconductor and theeddy current AC loss in the magnet mandrel and support structure. AClosses increase the heat load at 4 K. The added heat load increases thetemperature of the second stage of the cooler. In addition, AC losscontributes to the temperature rise between the second stage cold headand the high field point of the magnet, which is usually close to themagnet hot spot. These are the curses of AC loss in the MICE magnet thatcan limit the rate at which the magnet can be charge or discharged. Ifone is willing to allow some of the helium that is around the magnet toboil away during a magnet charge or discharge, AC losses can become ablessing. The boil off helium from the AC losses can be used to cool theupper end of the HTS leads and the surrounding shield. The AC losses arepresented for all three types of MICE magnets. The AC loss temperaturedrops within the coupling magnet are presented as an example of how boththe curse and blessing of the AC losses can be combined.
STFC Feb. 2015SCAPA dino@phys.strath.ac.uk Scottish Universities Physics Alliance
STFC Feb. 2015SCAPA dino@phys.strath.ac.uk Scottish Universities Physics Alliance MEDICAL dino@phys.strath.ac.uk Scottish Universities Physics Alliance Laser beam driven plasma accelerators X dose maps #12;STFC Feb. 2015SCAPA dino@phys.strath.ac.uk Scottish Universities Physics Alliance
R. L. Viana; A. M. Batista; C. A. S. Batista; J. C. A. de Pontes; F. A. dos S. Silva; S. R. Lopes
2011-09-15T23:59:59.000Z
Many networks of physical and biological interest are characterized by a long-range coupling mediated by a chemical which diffuses through a medium in which oscillators are embedded. We considered a one-dimensional model for this effect for which the diffusion is fast enough so as to be implemented through a coupling whose intensity decays exponentially with the lattice distance. In particular, we analyzed the bursting synchronization of neurons described by two timescales (spiking and bursting activity), and coupled through such a long-range interaction network. One of the advantages of the model is that one can pass from a local (Laplacian) type of coupling to a global (all-to-all) one by varying a single parameter in the interaction term. We characterized bursting synchronization using an order parameter which undergoes a transition as the coupling parameters are changed through a critical value. We also investigated the role of an external time-periodic signal on the bursting synchronization properties of the network. We show potential applications in the control of pathological rhythms in biological neural networks.
Hopkins, David James (Livermore, CA)
2008-05-13T23:59:59.000Z
A control system and method for actively reducing vibration in a spindle housing caused by unbalance forces on a rotating spindle, by measuring the force-induced spindle-housing motion, determining control signals based on synchronous demodulation, and provide compensation for the measured displacement to cancel or otherwise reduce or attenuate the vibration. In particular, the synchronous demodulation technique is performed to recover a measured spindle housing displacement signal related only to the rotation of a machine tool spindle, and consequently rejects measured displacement not related to spindle motion or synchronous to a cycle of revolution. Furthermore, the controller actuates at least one voice-coil (VC) motor, to cancel the original force-induced motion, and adapts the magnitude of voice coil signal until this measured displacement signal is brought to a null. In order to adjust the signal to a null, it must have the correct phase relative to the spindle angle. The feedback phase signal is used to adjust a common (to both outputs) commutation offset register (offset relative to spindle encoder angle) to force the feedback phase signal output to a null. Once both of these feedback signals are null, the system is compensating properly for the spindle-induced motion.
G. Ambika; R. E. Amritkar
2010-07-01T23:59:59.000Z
We have introduced a mechanism for synchronizing chaotic systems by one way coupling with a variable delay that is reset at finite intervals. Here we extend this method to time delay systems and suggest a new cryptosystem based on this. We present the stability analysis as applied to time delay systems and supplement this by numerical simulations in a standard time delay system like Mackey Glass system. We extend the theory to multi- delay systems and propose a bi channel scheme for the implementation of the scheme for communication with enhanced security. We show that since the synchronizing channel carries information from transmitter only at intervals of reset time, it is not susceptible to reconstruction. The message channel being separate can be made complex by linear combination of transmitter variable at different delay times using mutiple delay systems. This method has the additional advantage that it can be adjusted to be delay or anticipatory in synchronization and these provide two additional basic keys that are independent of system delay.
Reactive Power Laboratory: Synchronous Condenser Testing&Modeling Results - Interim Report
Henry, SD
2005-09-27T23:59:59.000Z
The subject report documents the work carried out by Oak Ridge National Laboratory (ORNL) during months 5-7 (May-July 2005) of a multi-year research project. The project has the overall goal of developing methods of incorporating distributed energy (DE) that can produce reactive power locally and for injecting into the distribution system. The objective for this new type of DE is to be able to provide voltage regulation and dynamic reactive power reserves without the use of extensive communication and control systems. The work performed over this three-month period focused on four aspects of the overall objective: (1) characterization of a 250HP (about 300KVAr) synchronous condenser (SC) via test runs at the ORNL Reactive Power Laboratory; (2) development of a data acquisition scheme for collecting the necessary voltage, current and power readings at the synchronous condenser and on the distribution system; (3) development of algorithms for analyzing raw test data from the various test runs; and (4) validation of a steady-state model for the synchronous condenser via the use of a commercial software package to study its effects on the ORNL 13.8/2.4kV distribution network.
No. 426 June 2013 newsletter.lms.ac.uk
Abrahams, I. David
No. 426 June 2013 1 NEWSLETTER ONLINE: newsletter.lms.ac.uk NEWSLETTER LONDON MATHEMATICAL SOCIETY Society Meetings and Events 2013 10-14 June LMS Invited Lectures, Edinburgh page 16 Tuesday 11 June Midlands Regional Meeting, Leicester page 11 Tuesday 25 June LMS Popular Lectures, London page 17 Friday 5
No. 427 July 2013 newsletter.lms.ac.uk
Abrahams, I. David
1 No. 427 July 2013 NEWSLETTER ONLINE: newsletter.lms.ac.uk NEWSLETTER LONDON MATHEMATICAL SOCIETY September LMS Popular Lectures, Birmingham page 4 Friday 15 November LMS AGM, London Monday 16 December SW, France and 2010 LMS Whitehead Prize winner has demonstrated the solution to a 271-year-old problem
www.eprg.group.cam.ac.uk EPRGWORKINGPAPER
Aickelin, Uwe
. Pollitt Economic drivers, technologies and demand side management are keys in understanding the long-economic context of energy demand, and the tension between technically possible energy savings one one sidewww.eprg.group.cam.ac.uk EPRGWORKINGPAPER Abstract The Economics of Energy (and Electricity) Demand
http://stir.ac.uk/4l Why study Management?
Little, Tony
http://stir.ac.uk/4l BSc(Hons) Management #12;Why study Management? Management essentially combines the flow of patients through hospital departments. Other modules include: Business Strategy, Project Management Case Studies and Energy Supply Case Study. Did you know? Excellent Management practice is required
Beaming into matter and life www.cockcroft.ac.uk
Crowther, Paul
Beaming into matter and life www.cockcroft.ac.uk COCKCROFT STRATEGY MAP 2014-2020 Vision Continue and train the next generation of scientists and engineers, address societal challenges in energy Â· Globally Unique Skills Base Â· Societal Impact: Energy, Environment, Health, Security Strategic Enablers
contents | print | close www.glasgow.ac.uk
Guo, Zaoyang
1 contents | print | close www.glasgow.ac.uk Gilmorehill Campus Development Framework June 2014 : Topic 4 107 Approach to Historic Assets: Sub Topics 108 · A Campus-wide Conservation Strategy 108 · Introduction 134 · Relevant Consultation Themes : Topic 7 135 Uses & Adaptability : Sub Topics 136 · Energy
contents | print | close www.glasgow.ac.uk
Guo, Zaoyang
1 contents | print | close www.glasgow.ac.uk Gilmorehill Campus Development Framework FINAL : Topic 4 107 Approach to Historic Assets: Sub Topics 108 · A Campus-wide Conservation Strategy 108 · Introduction 134 · Relevant Consultation Themes : Topic 7 135 Uses & Adaptability : Sub Topics 136 · Energy
Physics and www.manchester.ac.uk/physicsUNDERGRADUATEBROCHURE2014
Physics and Astronomy www.manchester.ac.uk/physicsUNDERGRADUATEBROCHURE2014 #12;One of Britain's largest and most respected schools of Physics and Astronomy, with top ratings for teaching and research, and two Nobel Prize winners in 2010 Recent Ł70 million extension and refurbishment of the Physics