Sample records for turbo dynamics university

  1. Designing and Mapping of a Turbo Decoder for 3G Mobile Systems Using Dynamically Reconfigurable Architecture

    E-Print Network [OSTI]

    Starzyk, Janusz A.

    Designing and Mapping of a Turbo Decoder for 3G Mobile Systems Using Dynamically Reconfigurable University, USA {imding|alsolaim|starzyk}@bobcat.ent.ohiou.edu Abstract Turbo codes enable high quality communication links by offering exceptional error correction capabilities. Turbo coding is proposed

  2. Zero State Doped Turbo Equalizer Orhan GAZI, is with Electronics and Communication Engineering Department, Cankaya University, 06530,

    E-Print Network [OSTI]

    Yýlmaz, �zgür

    1 Zero State Doped Turbo Equalizer Orhan GAZI, is with Electronics and Communication Engineering. In this article we propose zero state doped turbo equalizers (ZSDTEs) which can be processed in parallel and have to the sliding window method. Index Terms-- Turbo Codes, Turbo Equalizer, Zero State Doped Turbo Equalizer. I

  3. A Turbo Code Tutorial William E. Ryan

    E-Print Network [OSTI]

    Shea, John M.

    A Turbo Code Tutorial William E. Ryan New Mexico State University Box 30001 Dept. 3-O, Las Cruces, NM 88003 wryan@nmsu.edu Abstract| We give a tutorial exposition of turbo codes and the associated algorithms. Included are a simple derivation for the performance of turbo codes, and a straightforward

  4. The University has a number of dedicated automotive research centres, including the Powertrain and Vehicle Research Centre, the Turbo Centre and LARG (Lean and Agile

    E-Print Network [OSTI]

    Burton, Geoffrey R.

    The University has a number of dedicated automotive research centres, including the Powertrain and Vehicle Research Centre, the Turbo Centre and LARG (Lean and Agile Research Group) Automotive. The research carried out through these centres addresses the broad issues associated with the automotive

  5. REDUCED-COMPLEXITY DECODING FOR CONCATENATED CODES BASED ON RECTANGULAR PARITY-CHECK CODES AND TURBO CODES

    E-Print Network [OSTI]

    Wong, Tan F.

    AND TURBO CODES John M. Shea and Tan F. Wong University of Florida Department of Electrical and Computer-check code (RPCC) with a turbo code. These concatenated codes are referred to as RPCC+turbo codes. RPCC+turbo codes have been shown to significantly outperform turbo codes in several scenarios [1],[2]. One

  6. ENERGY-EFFICIENT TURBO DECODER Jagadeesh Kaza and Chaitali Chakrabarti

    E-Print Network [OSTI]

    Kambhampati, Subbarao

    ENERGY-EFFICIENT TURBO DECODER Jagadeesh Kaza and Chaitali Chakrabarti Department of Electrical Engineering Arizona State University, Tempe, 85287 jagadeeshk@asu.edu, chaitali@asu.edu ABSTRACT Turbo codes termination on the Bit Error Rate (BER) and energy consumption for a Turbo decoder implemented on a general

  7. Turbo Decoding as Constrained Optimization John M. Walsh

    E-Print Network [OSTI]

    Regalia, Phillip A.

    Turbo Decoding as Constrained Optimization John M. Walsh School of Elec. and Comp. Eng. Cornell. Cornell University Ithaca, NY 14850 johnson@ece.cornell.edu June 25, 2005 Abstract The turbo decoder was not originally introduced as a solution to an optimization problem. This has made explaining just why the turbo

  8. A Pipelined Turbo Decoder with Random Convolutional Interleaver Werner Henkel

    E-Print Network [OSTI]

    Henkel, Werner

    A Pipelined Turbo Decoder with Random Convolutional Interleaver Werner Henkel University of Applied: jusif, sayir¡ @ftw.at Abstract-- This paper describes a pipelined iterative decoder ("Turbo" decoder. INTRODUCTION SINCE the introduction of "Turbo" codes in 1993 [1] the coding community has put much effort

  9. Electric Turbo Compounding Technology Update

    Broader source: Energy.gov (indexed) [DOE]

    Turbo Compounding Technology Update Electric Turbo Compounding Technology Update 15 August, 2007 Carl Vuk 15 August, 2007 Carl Vuk Electric Turbo Compounding Highlights Electric...

  10. Turbo Equalization With Irregular Turbo Codes

    E-Print Network [OSTI]

    Vladimir D. Trajkovi?; Minyue Fu; Peter J. Schreier

    Abstract—We analyze a turbo equalization system that combines Maximum a Posteriori Probability (MAP) equalization with irregular turbo codes. Our goal is to approach the information capacity limit for severe Inter-Symbol Interference (ISI) channels. To this end, we optimize the degree profile of irregular turbo codes by maximizing the minimum distance between the mutual information transfer functions for the MAP equalizer and decoder. We show that turbo equalizers employing such optimized irregular turbo codes can approach the information capacity limit of some severe ISI channels within 0.75 dB. I.

  11. How to produce a turbo equalization system with complexity O(logL)?

    E-Print Network [OSTI]

    Huang, Jianwei

    How to produce a turbo equalization system with complexity O(logL)? by Professor Defeng Huang University of Hong Kong Abstract Following the great success of turbo codes in 1993, turbo equalization-symbol interference channels. However, for more than 15 years, the prohibitive complexity of turbo equalization has

  12. Advance Turbo Encoder and Turbo Decoder

    E-Print Network [OSTI]

    Manjunatha K N; Kiran B; Prasanna Kumar. C

    Abstract- This paper presents the design and development of an efficient VLSI architecture for 3GPP advanced Turbo decoder by utilizing the convolutional interleaver. The high-throughput 3GPP Advance Turbo code requires turbo decoder architecture. Interleaver is known to be the main obstacle to the decoder implementation and introduces latency, due to the collisions it introduces in accesses to memory. In this paper, we propose a low-complexity Soft Input Soft Output (SISO) turbo decoder for memory architecture to enable the Turbo decoding that achieves minimum latency. Design trade-offs in terms of area and throughput efficiency are explored to find the optimal architecture. The proposed Turbo decoder has been modeled using Simulink; various test cases are used to estimate the performances. The results are analyzed and achieved 50 % reduction in computation time along with reduced BER (e-3). The hardware of the Turbo Encoder and Turbo Decoder has been modeled in Verilog, simulated in Modelsim, synthesized using TSMC 65 nm Synopsys Design compiler and physical implementation has been carried out using IC Compiler.

  13. Dynamics of Anisotropic Universes

    E-Print Network [OSTI]

    Jerome Perez

    2006-03-30T23:59:59.000Z

    We present a general study of the dynamical properties of Anisotropic Bianchi Universes in the context of Einstein General Relativity. Integrability results using Kovalevskaya exponents are reported and connected to general knowledge about Bianchi dynamics. Finally, dynamics toward singularity in Bianchi type VIII and IX universes are showed to be equivalent in some precise sence.

  14. Unequal Error Protection Turbo Codes

    E-Print Network [OSTI]

    Henkel, Werner

    Unequal Error Protection Turbo Codes Diploma Thesis Neele von Deetzen Arbeitsbereich Nachrichtentechnik School of Engineering and Science Bremen, February 28th, 2005 #12;Unequal Error Protection Turbo Convolutional Codes / Turbo Codes 18 3.1 Structure

  15. Iterative Decoding and Turbo Equalization: The Z-Crease Phenomenon

    E-Print Network [OSTI]

    Jing Li; Kai Xie

    2013-06-03T23:59:59.000Z

    Iterative probabilistic inference, popularly dubbed the soft-iterative paradigm, has found great use in a wide range of communication applications, including turbo decoding and turbo equalization. The classic approach of analyzing the iterative approach inevitably use the statistical and information-theoretical tools that bear ensemble-average flavors. This paper consider the per-block error rate performance, and analyzes it using nonlinear dynamical theory. By modeling the iterative processor as a nonlinear dynamical system, we report a universal "Z-crease phenomenon:" the zig-zag or up-and-down fluctuation -- rather than the monotonic decrease -- of the per-block errors, as the number of iteration increases. Using the turbo decoder as an example, we also report several interesting motion phenomenons which were not previously reported, and which appear to correspond well with the notion of "pseudo codewords" and "stopping/trapping sets." We further propose a heuristic stopping criterion to control Z-crease and identify the best iteration. Our stopping criterion is most useful for controlling the worst-case per-block errors, and helps to significantly reduce the average-iteration numbers.

  16. Convergence and Complexity Analysis of Turbo Demodulation with Turbo Decoding

    E-Print Network [OSTI]

    Brest, Université de

    Convergence and Complexity Analysis of Turbo Demodulation with Turbo Decoding Salim Haddad, Amer (BICM) with different modulation orders and Turbo Codes with various code rates are frequently adopted-ID schemes was replaced by a turbo code, only a small gain of 0.1 dB was observed. This result makes BICM

  17. Robust Turbo Equalization Under Channel Uncertainties Nargiz Kalantarova, Suleyman S. Kozat and Alper T. Erdogan

    E-Print Network [OSTI]

    Erdogan, Alper Tunga

    Robust Turbo Equalization Under Channel Uncertainties Nargiz Kalantarova, Suleyman S. Kozat and Alper T. Erdogan Koc University, Istanbul, 34450, Turkey Abstract-- Robust turbo equalization over is investigated. The turbo equal- ization framework proposed in this paper contains a linear equalizer (LE

  18. Distance Spectrum Analysis of Third Generation Turbo Codes

    E-Print Network [OSTI]

    unknown authors

    Abstract: Turbo Codes are a class of powerful error correction codes that were introduced in 1993 by a group of researchers from France, which has the performance near the limit of Claude Shannon. After the introduction of turbo codes it has given raise a tremendous research work related to the new coding theory. This paper addresses the performance of Turbo codes by examining the codes ’ distance spectrum. It is well known that error floor occurs in the performance curve of turbo codes at moderate to high signal-to-noise ratio. The cause of error floor is due to the relatively low free distance of the codewords. Several techniques were proposed by researchers to lower the error floor. These techniques are assessed in this paper. To determine the free distance several algorithms were developed by different researchers. In this paper we used one of the recent algorithm to evaluate the distance spectrum of Turbo codes. We concentrate our analysis to measure and explain the distance spectrum of UMTS (Universal Mobile Telecommunication System), cdma2000 and CCSDS (Consultative Committee for Space Data Systems) standards Turbo Codes. It is shown that the distance spectrum depends on the code rate, interleaver size and the interleaver type.This distance spectrum of turbo codes can be used to estimate its performance at medium to higher SNR (signal to noise ratio). From our analysis we find out that the distance spectrum is one of the elementary issues using which one can find the optimum architecture of Turbo codes for specific application.

  19. Chaotic Turbo Codes

    E-Print Network [OSTI]

    S. Adrian Barbulescu; Andrew Guidi; Steven S. Pietrobon

    This paper describes a new class of codes, chaotic turbo codes. They were born from a symbiosis between a chaotical digital encoder and a turbo code. This paper investigates the most important properties of both chaotic digital encoders and turbo encoders in order to understand how the two complement each other. A Chaotic Turbo Encoder is then described and initial results will be presented. I. INTRODUCTION A chaotic digital encoder was defined for the first time in [1] as a non--linear digital filter with finite precision (8 bits) which behaves in a quasi--chaotic fashion, both with zero and nonzero input sequences. A simple chaotic encoder is shown in Figure 1 [1]. D Y k X k LCIRC D Figure 1: Chaotic Digital Encoder Mapper L L L L L L 1 The main features of chaotic digital encoders that are used in this paper are: # The system is digital which makes possible its integration with a turbo code. # The output of a chaotic digital encoder with arbitrary inputs has a broad...

  20. PERFORMANCE EVALUATION OF TURBO CODES

    E-Print Network [OSTI]

    Alajaji, Fady

    PERFORMANCE EVALUATION OF TURBO CODES by Guangchong Zhu A project submitted to the Department named ``Turbo codes'' which claims an extraordinary performance with reasonable decoding complexity. In this project, we begin with a study on the structure and principle of Turbo codes. We then investigate

  1. From Turbo2 to TurboWin For ages already, information about

    E-Print Network [OSTI]

    Koek, Frits

    From Turbo2 to TurboWin For ages already, information about the weather on board ships was re the operating sys- tem MsDOS and was called, suggesting a `speedy' character, Turbo2 (Turbo Transmission

  2. Van Turbo2 naar TurboWin Al eeuwen lang werden de gege-

    E-Print Network [OSTI]

    Koek, Frits

    Van Turbo2 naar TurboWin Al eeuwen lang werden de gege- vens over het weer aan boord van schepen' karakter te ge- ven, Turbo2 (Turbo Transmission of Weather Observations). Andere namen die indertijd werden

  3. Near-Capacity Turbo Equalization Using Optimized Turbo Codes

    E-Print Network [OSTI]

    Vladimir D. Trajkovi?; Minyue Fu; Peter J. Schreier

    Abstract—In this paper we analyze a turbo equalization scheme that combines Maximum a Posteriori Probability (MAP) equalization and turbo decoding. Our aim is to optimize the turbo equalizer in order to approach the information capacity limit for channels with severe Inter-Symbol Interference (ISI). For this purpose, we perform an extensive search for turbo codes that give an SNR-BER performance closest to the channel information capacity limit. Our results show that the optimized turbo equalizer can approach the information capacity limit to within 0.7 dB. We also optimize the turbo equalizer in terms of the minimum number of required turbo decoding iterations. Our results show that a turbo decoder within a turbo equalization loop requires only a small number of iterations. Finally, our analysis reveals that when there are turbo codes with similar extrinsic information transfer characteristics, the computational complexity can be reduced by choosing the code with the smallest constraint length with no loss in SNR-BER performance. I.

  4. Turbo and LDPC Codes: Implementation, Simulation,

    E-Print Network [OSTI]

    Valenti, Matthew C.

    1 Turbo and LDPC Codes: Implementation, Simulation, and Standardization June 7, 2006 Matthew/7/2006 Turbo and LDPC Codes 2/133 Tutorial Overview Channel capacity Convolutional codes ­ the MAP algorithm Turbo codes ­ Standard binary turbo codes: UMTS and cdma2000 ­ Duobinary CRSC turbo codes: DVB

  5. Performance and reliability enhancement of turbo-pump labyrinth seals

    E-Print Network [OSTI]

    Guidry, Michael James

    1991-01-01T23:59:59.000Z

    PERFORMANCE AND RELIABILITY ENHANCEMENT OF TURBO-PUMP LABYRINTH SEALS A Thesis by MICHAEL JAMES GUIDRY, JR. Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE August 1991 Major Subject: Mechanical Engineering PERFORMANCE AND RELIABILITY ENHANCEMENT OF TURBO-PUMP LABYRINTH SEALS A Thesis by Michael Ja. mes Guidry, Jr. Approved as to style and content by: D. L. Rhode (Chair...

  6. Entanglement boosts quantum turbo codes

    E-Print Network [OSTI]

    Wilde, Mark M

    2010-01-01T23:59:59.000Z

    One of the unexpected breakdowns in the existing theory of quantum serial turbo coding is that a quantum convolutional encoder cannot simultaneously be recursive and non-catastrophic. These properties are essential for a quantum turbo code to have an unbounded minimum distance and for its iterative decoding algorithm to converge, respectively. Here, we show that the entanglement-assisted paradigm gives a theoretical and practical "turbo boost" to these codes, in the sense that an entanglement-assisted quantum (EAQ) convolutional encoder can possess both of the aforementioned desirable properties, and simulation results indicate that entanglement-assisted turbo codes can operate reliably in a noise regime 5.5 dB beyond that of standard quantum turbo codes. Entanglement is the resource that enables a convolutional encoder to satisfy both properties because an encoder acting on only information qubits, classical bits, gauge qubits, and ancilla qubits cannot simultaneously satisfy them. We give several examples o...

  7. Implementation and Performance of Parallelised Turbo Decoders

    E-Print Network [OSTI]

    Yýlmaz, �zgür

    1 Implementation and Performance of Parallelised Turbo Decoders Enes Erdin TUBITAK Defense In this paper, we discuss the implementation of a low latency decoding algorithm for turbo codes and repeat. Index Terms Turbo codes, repeat accumulate codes, parallellised turbo decoding, BCJR, FPGA, metric

  8. Turbo-Charged Lighting Design

    E-Print Network [OSTI]

    Clark, W. H. II

    TURBO-CHARGED LIGHTING DESIGN William H. Clark II Design Engineer O'Connell Robertson & Assoc Austin/ Texas ABSTRACT The task of the lighting designer has become very complex, involving thousands of choices for fixture types and hundreds...

  9. Turbo-Decoding RNA Secondary Structure Turbo-Decoding of RNA Secondary Structure

    E-Print Network [OSTI]

    Sharma, Gaurav

    Background Turbo-Decoding RNA Secondary Structure References Turbo-Decoding of RNA Secondary and Computational Biology June 18, 2013 1 #12;Outline Turbo-decoding in Communications: A Quick Review #12;Outline Turbo-decoding in Communications: A Quick Review RNA Structure Analysis: Motivation and Background RNA

  10. IEEE COMMUNICATIONS LETTERS, VOL. 2, NO. 4, APRIL 1998 107 Combined Turbo Equalization and Turbo Decoding

    E-Print Network [OSTI]

    Raphaeli, Dan

    IEEE COMMUNICATIONS LETTERS, VOL. 2, NO. 4, APRIL 1998 107 Combined Turbo Equalization and Turbo Decoding Dan Raphaeli, Member, IEEE, and Yoram Zarai Abstract-- In this letter, the subject of turbo coding will be presented, which combines the channel equalization and the turbo decoding. At each iteration extrinsic

  11. Turbo Dynamics | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to:Ezfeedflag JumpID-fTri Global Energy LLC Place: Dallas, Texas Zip:HillsTucker,Tupman,Revenue

  12. Turbo Lattices: Construction and Performance Analysis

    E-Print Network [OSTI]

    Sakzad, Amin; Panario, Daniel

    2011-01-01T23:59:59.000Z

    In this paper a new class of lattices called turbo lattices is introduced and established. We use the lattice Construction $D$ to produce turbo lattices. This method needs a set of nested linear codes as its underlying structure. We benefit from turbo codes as our basis codes. Therefore, a set of nested turbo codes based on nested interleavers and nested convolutional codes is built. To this end, we employ both tail-biting and zero-tail convolutional codes. Using these codes, along with construction $D$, turbo lattices are created. Several properties of Construction $D$ lattices and fundamental characteristics of turbo lattices including the minimum distance, coding gain, kissing number and an upper bound on the probability of error under a maximum likelihood decoder over AWGN channel are investigated. Furthermore, a multi-stage turbo lattice decoding algorithm based on iterative turbo decoding algorithm is given. Finally, simulation experiments provide strong agreement with our theoretical results. More prec...

  13. Performance and Emission Characteristics of an Aircraft Turbo Diesel Engine using JET-A Fuel

    E-Print Network [OSTI]

    Underwood, Sean Christopher

    2008-05-05T23:59:59.000Z

    Performance and emission data was acquired by testing an aircraft turbo diesel engine with JET-A at the Mal Harned Propulsion Laboratory of the University of Kansas. The performance data was analyzed and compared to the presented data...

  14. Shortened Turbo Codes

    E-Print Network [OSTI]

    David J.C. MacKay

    Simple arguments suggest that shortened codes must have distance properties equal to or better than those of their parent codes, and that they should be equally practical to decode. This relationship holds true in the case of low density generator codes and low density parity check codes. We investigate the properties of shortened turbo codes. I. Motivation for Shortening In our previous work on codes based on very sparse matrices we have observed that while codes with a low density generator matrix [1] are asymptotically bad, codes with a low density parity check matrix [2] are asymptotically good [3, 4, 5]. One way of viewing the relationship between low density generator matrix codes and low density parity check matrix codes is that one obtains a low density parity check matrix by taking the M \\Theta N parity check matrix [P IM ] of a (N; K) low density generator matrix code and chopping off its right-most M columns (where M = N \\Gamma K), to yield an M \\Theta K matrix [P], which...

  15. Turbo-codes quantiques Mamdouh ABBARA

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Turbo-codes quantiques Mamdouh ABBARA Th`ese r´ealis´ee `a INRIA, Sous la direction de Jean . . . . . . . . . . . . . . . . . . . . . . . . 15 1.8 Performances de d´ecodage d'un code convolutif . . . . . . . . . . 19 1.9 Le turbo-encodage en parall`ele . . . . . . . . . . . . . . . . . . . 20 1.10 Le turbo-encodage en s

  16. CONTRACTIVITY IN TURBO ITERATIONS Phillip A. Regalia

    E-Print Network [OSTI]

    Regalia, Phillip A.

    CONTRACTIVITY IN TURBO ITERATIONS Phillip A. Regalia Department of Communications, Image Fourier 91011 Evry cedex France Phillip.Regalia@int-evry.fr ABSTRACT The turbo decoding algorithm has met with intense study over the past decade, in an attempt to harness the full power of the "turbo principle". Here

  17. Optimality and Duality of the Turbo Decoder

    E-Print Network [OSTI]

    Regalia, Phillip A.

    INVITED P A P E R Optimality and Duality of the Turbo Decoder Two optimality criteria which underlie the turbo decoder are reconciled within. By Phillip A. Regalia, Fellow IEEE, and John MacLaren Walsh, Member IEEE ABSTRACT | The near-optimal performance of the turbo decoder has been a source

  18. From Awareness to TeamRooms, GroupWeb and TurboTurtle: Eight Snapshots of Recent Work in the

    E-Print Network [OSTI]

    Greenberg, Saul

    From Awareness to TeamRooms, GroupWeb and TurboTurtle: Eight Snapshots of Recent Work in the Group. and Cockburn, A. (1995) From Awareness to TeamRooms, GroupWeb and TurboTurtle: Eight Snapshots of Recent Work in the GroupLab Project. Research Report 95/580/32, Department of Computer Science, University of Calgary

  19. Turbo Equalization Ralf Koetter, Andrew C. Singer, Michael Tuchler

    E-Print Network [OSTI]

    Koetter, Ralf

    1 Turbo Equalization Ralf Koetter, Andrew C. Singer, Michael T¨uchler Abstract-- Capitalizing on the tremendous performance gains of turbo codes and the turbo decoding algorithm, turbo equalization from intersymbol interference (ISI). In this paper, we dis- cuss the turbo equalization approach

  20. 1 Evaluation of the Intel ® Core ™ i7 Turbo Boost feature

    E-Print Network [OSTI]

    James Charles; Preet Jassi; Ananth Narayan S; Abbas Sadat; Ra Fedorova

    Abstract—The Intel ® Core ™ i7 processor code named Nehalem has a novel feature called Turbo Boost which dynamically varies the frequencies of the processor’s cores. The frequency of a core is determined by core temperature, the number of active cores, the estimated power and the estimated current consumption. We perform an extensive analysis of the Turbo Boost technology to characterize its behavior in varying workload conditions. In particular, we analyze how the activation of Turbo Boost is affected by inherent properties of applications (i.e., their rate of memory accesses) and by the overall load imposed on the processor. Furthermore, we analyze the capability of Turbo Boost to mitigate Amdahl’s law by accelerating sequential phases of parallel applications. Finally, we estimate the impact of the Turbo Boost technology on the overall energy consumption. We found that Turbo Boost can provide (on average) up to a 6% reduction in execution time but can result in an increase in energy consumption up to 16%. Our results also indicate that Turbo Boost sets the processor to operate at maximum frequency (where it has the potential to provide the maximum gain in performance) when the mapping of threads to hardware contexts is sub-optimal. I.

  1. On the Convergence Speed of Turbo Demodulation with Turbo Decoding

    E-Print Network [OSTI]

    Haddad, Salim; Jezequel, Michel

    2012-01-01T23:59:59.000Z

    Iterative processing is widely adopted nowadays in modern wireless receivers for advanced channel codes like turbo and LDPC codes. Extension of this principle with an additional iterative feedback loop to the demapping function has proven to provide substantial error performance gain. However, the adoption of iterative demodulation with turbo decoding is constrained by the additional implied implementation complexity, heavily impacting latency and power consumption. In this paper, we analyze the convergence speed of these combined two iterative processes in order to determine the exact required number of iterations at each level. Extrinsic information transfer (EXIT) charts are used for a thorough analysis at different modulation orders and code rates. An original iteration scheduling is proposed reducing two demapping iterations with reasonable performance loss of less than 0.15 dB. Analyzing and normalizing the computational and memory access complexity, which directly impact latency and power consumption, ...

  2. Supercritical Carbon Dioxide Turbo-Expander and Heat Exchangers...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Supercritical Carbon Dioxide Turbo-Expander and Heat Exchangers Supercritical Carbon Dioxide Turbo-Expander and Heat Exchangers This fact sheet describes a supercritical carbon...

  3. Project Profile: Supercritical Carbon Dioxide Turbo-Expander...

    Energy Savers [EERE]

    Supercritical Carbon Dioxide Turbo-Expander and Heat Exchangers Project Profile: Supercritical Carbon Dioxide Turbo-Expander and Heat Exchangers SWRI Logo The Southwest Research...

  4. Turbo Decoding on the Binary Erasure Channel: Finite-Length Analysis and Turbo Stopping Sets

    E-Print Network [OSTI]

    Eirik Rosnes; Øyvind Ytrehus; Senior Member

    2006-01-01T23:59:59.000Z

    This paper is devoted to the finite-length analysis of turbo decoding over the binary erasure channel (BEC). The performance of iterative belief-propagation (BP) decoding of low-density parity-check (LDPC) codes over the BEC can be characterized in terms of stopping sets. We describe turbo decoding on the BEC which is simpler than turbo decoding on other channels. We then adapt the concept of stopping sets to turbo decoding and state an exact condition for decoding failure. Apply turbo decoding until the transmitted codeword has been recovered, or the decoder fails to progress further. Then the set of erased positions that will remain when the decoder stops is equal to the unique maximum-size turbo stopping set which is also a subset of the set of erased positions. Furthermore, we present some improvements of the basic turbo decoding algorithm on the BEC. The proposed improved turbo decoding algorithm has substantially better error performance as illustrated by the given simulation results. Finally, we give an expression for the turbo stopping set size enumerating function under the uniform interleaver assumption, and an efficient enumeration algorithm of small-size turbo stopping sets for a particular interleaver. The solution is based on the algorithm proposed by Garello et al. in 2001 to compute an exhaustive list of all low-weight codewords in a turbo code.

  5. RESEARCH Open Access Multi-non-binary turbo codes

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    RESEARCH Open Access Multi-non-binary turbo codes Horia Balta1,2 , Catherine Douillard3 and Radu Lucaciu1* Abstract This paper presents a new family of turbo codes called multi-non-binary turbo codes (MNBTCs) that generalizes the concept of turbo codes to multi-non-binary (MNB) parallel concatenated

  6. Turbo Detection for Mobile MIMO Underwater Acoustic Communications

    E-Print Network [OSTI]

    Zheng, Yahong Rosa

    Turbo Detection for Mobile MIMO Underwater Acoustic Communications Jun Tao , Yahong Rosa Zheng-- Turbo detection for high data-rate single-carrier mobile multiple-input, multiple-output (MIMO signal is then sent to a MIMO turbo equalization module for detection. In the MIMO turbo equalization

  7. Figure 1. Block diagram of the turbo decoder. A Memory-Reduced Log-MAP Kernel for Turbo Decoder

    E-Print Network [OSTI]

    Hung, Shih-Hao

    Figure 1. Block diagram of the turbo decoder. A Memory-Reduced Log-MAP Kernel for Turbo Decoder--Generally, the Log-MAP kernel of the turbo decoding consume large memories in hardware implement- tation of the turbo decoder is implemented to verify the proposed memory-reduced Log- MAP kernel in 3.04Ã?3.04mm2 core

  8. A REAL-TIME EMBEDDED SOFTWARE IMPLEMENTATION OF A TURBO ENCODER AND SOFT OUTPUT VITERBI ALGORITHM BASED TURBO DECODER

    E-Print Network [OSTI]

    Evans, Brian L.

    A REAL-TIME EMBEDDED SOFTWARE IMPLEMENTATION OF A TURBO ENCODER AND SOFT OUTPUT VITERBI ALGORITHM BASED TURBO DECODER M. Farooq Sabir, Rashmi Tripathi, Brian L. Evans and Alan C. Bovik Dept,rashmi,bevans,bovik}@ece.utexas.edu ABSTRACT Turbo codes are used for error protection, esp. in wireless systems. A turbo encoder consists

  9. Quantum serial turbo-codes

    E-Print Network [OSTI]

    David Poulin; Jean-Pierre Tillich; Harold Ollivier

    2009-06-10T23:59:59.000Z

    We present a theory of quantum serial turbo-codes, describe their iterative decoding algorithm, and study their performances numerically on a depolarization channel. Our construction offers several advantages over quantum LDPC codes. First, the Tanner graph used for decoding is free of 4-cycles that deteriorate the performances of iterative decoding. Secondly, the iterative decoder makes explicit use of the code's degeneracy. Finally, there is complete freedom in the code design in terms of length, rate, memory size, and interleaver choice. We define a quantum analogue of a state diagram that provides an efficient way to verify the properties of a quantum convolutional code, and in particular its recursiveness and the presence of catastrophic error propagation. We prove that all recursive quantum convolutional encoder have catastrophic error propagation. In our constructions, the convolutional codes have thus been chosen to be non-catastrophic and non-recursive. While the resulting families of turbo-codes have bounded minimum distance, from a pragmatic point of view the effective minimum distances of the codes that we have simulated are large enough not to degrade the iterative decoding performance up to reasonable word error rates and block sizes. With well chosen constituent convolutional codes, we observe an important reduction of the word error rate as the code length increases.

  10. Aerospace & Energetics Research Program -University of Washington Plasma Dynamics Group

    E-Print Network [OSTI]

    Shumlak, Uri

    - University of Washington Plasma Dynamics Group q The Boltzmann equation is seven dimensional. qAerospace & Energetics Research Program - University of Washington Plasma Dynamics Group Plasma Research Program - University of Washington Plasma Dynamics Group Abstract Many current plasma simulation

  11. Proceedings of ASME Turbo Expo 2002

    E-Print Network [OSTI]

    Liu, Feng

    Proceedings of ASME Turbo Expo 2002 June 03, 2002, Amsterdam, , Netherlands GT-2002 has only 1 Copyright © 2002 by ASME #12;been investigated by a limited number of researchers. The un-dimensional and unsteady Navier Stokes code

  12. Proceedings of ASME TURBO EXPO 2002 International Gas Turbine & Aeroengine Congress & Exhibition

    E-Print Network [OSTI]

    Peraire, Jaime

    Proceedings of ASME TURBO EXPO 2002 International Gas Turbine & Aeroengine Congress & Exhibition dynamics code using the proper orthogonal decomposition technique. This results in a low-order model to be a signifi- 1 Copyright 2002 by ASME #12;cant factor, increasing the vibratory stress levels by 70% over

  13. Synchronization of Turbo Codes Based on Online Statistics

    E-Print Network [OSTI]

    Valenti, Matthew C.

    Synchronization of Turbo Codes Based on Online Statistics Jian Sun and Matthew C. Valenti Wireless 26506-6109 email: [jian,mvalenti]@csee.wvu.edu, phone: 304-293-0405, fax: 304-293-8602 Abstract-- Turbo. Since turbo codes are intended to be deployed in environments with very low SNR, conventional

  14. Joint Source-Channel Coding via Turbo Codes

    E-Print Network [OSTI]

    Alajaji, Fady

    Joint Source-Channel Coding via Turbo Codes by Guang-Chong Zhu A dissertation submitted coding. One of the most exciting break- throughs in channel coding is the invention of Turbo codes, whose- tigate three joint source-channel coding issues in the context of Turbo codes. In the #12;rst part

  15. Turbo Space-Time Codes with Time Varying Linear Transformations

    E-Print Network [OSTI]

    Haimovich, Alexander

    1 Turbo Space-Time Codes with Time Varying Linear Transformations Hangjun Chen and Alexander 07102 Email: {hangjun.chen; alexander.m.haimovich}@njit.edu Abstract Turbo space-time codes with symbols in this paper. It is shown that turbo codes with TVLT achieve full diversity gain and do not require exhaustive

  16. A Turbo Iteration Algorithm In 16QAM Hierarchical Modulation

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    A Turbo Iteration Algorithm In 16QAM Hierarchical Modulation Xu Zhe Electric and Information on the turbo code, OFDM modulation and 16QAM hierarchical modulation to increase the flexibility, and in the high SNR, it can also gain a high BER performance of low priority bit stream. Keywords- turbo iteration

  17. Compression of redundancy free trellis stages in Turbo-Decoder

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Compression of redundancy free trellis stages in Turbo-Decoder E. Boutillon, J. Sánchez-Rojas and C. Marchand For turbo code with coding rate close to one, the high puncturing rate induces long sequences. The computation is reduced accordingly. Introduction: Turbo codes with coding rate close to one are specified

  18. On Multiple Slice Turbo Codes(1)(2) David Gnaedig*

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    On Multiple Slice Turbo Codes(1)(2) David Gnaedig* , Emmanuel Boutillon+ , Michel Jézéquel- , Vincent C. Gaudet° and P. Glenn Gulak& * TurboConcept + LESTER. Université de Bretagne Sud - ENST Bretagne.gnaedig@univ-ubs.fr, emmanuel.boutillon@univ-ubs.fr Abstract: The main problem concerning the hardware implementation of turbo

  19. Turbo synchronization : an EM algorithm interpretation , C. Herzet

    E-Print Network [OSTI]

    Steendam, Heidi

    Turbo synchronization : an EM algorithm interpretation N. Noels* , C. Herzet , A. Dejonghe , V is devoted to turbo synchronization, that is to say the use of soft information to estimate parameters like carrier phase, frequency offset or timing within a turbo receiver. It is shown how maximum

  20. Methods for the Reconstruction of Parallel Turbo Codes

    E-Print Network [OSTI]

    Cluzeau, Mathieu; Tillich, Jean-Pierre

    2010-01-01T23:59:59.000Z

    We present two new algorithms for the reconstruction of turbo codes from a noisy intercepted bitstream. With these algorithms, we were able to reconstruct various turbo codes with realistic parameter sizes. To the best of our knowledge, these are the first algorithms able to recover the whole permutation of a turbo code in the presence of high noise levels.

  1. Variable Latency Turbo Codes for Wireless Multimedia Applications

    E-Print Network [OSTI]

    Valenti, Matthew C.

    Variable Latency Turbo Codes for Wireless Multimedia Applications Matthew C. Valenti and Brian D acceptable latency and Bit Error Rate BER or Frame Error Rate FER. In turbo coded systems a tradeo between an adaptive turbo coding strategy for wire- less multimedia communications that incor- porates a set

  2. CommunicotionTheory Improved Turbo Decoding through Belief

    E-Print Network [OSTI]

    Kim, Saejoon

    CommunicotionTheory Improved Turbo Decoding through Belief Propagation Saejoon Kim and Stephen B to obtain any insight as to the functionality of turbo decoding. Graph- based techniques do, however, lead to useful extensions and general- izations of the turbo decoding concept. In this paper we use a graph

  3. Simplified Compression of Redundancy Free Trellis Sections in Turbo Decoder

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Simplified Compression of Redundancy Free Trellis Sections in Turbo Decoder Emmanuel Boutillon that for an M state Turbo decoder, among the L compressed trellis stages, only m = 3 or even m = 2 are necessary turbo-code and/or to reduce its power consumption.1 I. INTRODUCTION The quality of an error control code

  4. A HIGHLY PARALLEL TURBO PRODUCT CODE DECODER WITHOUT INTERLEAVING RESOURCE

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    A HIGHLY PARALLEL TURBO PRODUCT CODE DECODER WITHOUT INTERLEAVING RESOURCE Camille Leroux-STICC firstname.lastname@telecom-bretagne.eu ABSTRACT This article presents an innovative Turbo Product Code (TPC of such an architecture compared with exist- ing previous solutions. Considering a 6-iteration turbo de- coder of a (32

  5. Joint Synchronization and Decoding Exploiting the Turbo Principle

    E-Print Network [OSTI]

    Regalia, Phillip A.

    Joint Synchronization and Decoding Exploiting the Turbo Principle John M. Walsh and C. Richard´el´ecommunications/GET 91011 Evry cedex France Abstract-- This paper investigates turbo methods for joint synchronization and decoding in pulse amplitude modulated (PAM) systems. We begin with a brief review of the turbo principle

  6. Differential Turbo Coded Modulation with APP Channel Estimation

    E-Print Network [OSTI]

    Howard, Sheryl

    Differential Turbo Coded Modulation with APP Channel Estimation Sheryl L. Howard and Christian, iterative decoding. I. INTRODUCTION With the advent of turbo codes [1], [2] and iterative de- coding in very high noise/low signal- to-noise ratio (SNR) environments. Turbo trellis coded modulation (TTCM

  7. AREA-EFFICIENTHIGH-THROUGHPUTVLSI ARCHITECTUREFOR MAP-BASED TURBO EQUALIZER

    E-Print Network [OSTI]

    Singer, Andrew C

    AREA-EFFICIENTHIGH-THROUGHPUTVLSI ARCHITECTUREFOR MAP-BASED TURBO EQUALIZER Seok-Jun Lee, Naresh R an area-efficient MAP-based turbo equalizer VLSI architecture by proposing a symbol-based soft-input soft-interleaved com- putation with an area savings of 25%. 1. INTRODUCTION The turbo decoding technique has found

  8. SNR Estimation in Nakagami Fading with Diversity for Turbo Decoding

    E-Print Network [OSTI]

    Chockalingam, A.

    SNR Estimation in Nakagami Fading with Diversity for Turbo Decoding A. Ramesh£, A. Chockalingam-� fading channels without di- versity combining and used this estimate in the decoding of turbo codes. Now equal gain diversity combining. We use our SNR estimates in the iterative decoding of turbo codes

  9. Fast Decodable Turbo Codes Orhan GAZI, A. Ozgur YILMAZ

    E-Print Network [OSTI]

    Yýlmaz, �zgür

    1 Fast Decodable Turbo Codes Orhan GAZI, A. ¨Ozg¨ur YILMAZ Abstract-- Decoding delay is an important consideration for the use of turbo codes in practical applications. We propose a new structure for turbo codes which is very suitable for parallel decoding. It is shown by union bound analysis

  10. A Survey on Turbo Codes and Recent Developments

    E-Print Network [OSTI]

    Parker, Matthew Geoffrey

    A Survey on Turbo Codes and Recent Developments by Halvor Utby halvor.utby@student.uib.no Thesis . . . . . . . 30 4 Turbo-codes 41 4.1 Shannon limit . . . . . . . . . . . . . . . . . . . . . . 41 4.2 Encoding . . . . . . . . . . . . . . 47 4.5.2 Soft-Output Viterbi Algorithm (SOVA) . . . . 48 5 New Research in Turbo Codes 51 5

  11. Self-Inverse Interleavers for Turbo Codes

    E-Print Network [OSTI]

    Sakzad, Amin; Panario, Daniel; Eshghi, Nasim

    2010-01-01T23:59:59.000Z

    In this work we introduce and study a set of new interleavers based on permutation polynomials and functions with known inverses over a finite field $\\mathbb{F}_q$ for using in turbo code structures. We use Monomial, Dickson, M\\"{o}bius and R\\'edei functions in order to get new interleavers. In addition we employ Skolem sequences in order to find new interleavers with known cycle structure. As a byproduct we give an exact formula for the inverse of every R\\'edei function. The cycle structure of R\\'edei functions are also investigated. Finally, self-inverse versions of permutation functions are used to construct interleavers. These interleavers are their own de-interleavers and are useful for turbo coding and turbo decoding. Experiments carried out for self-inverse interleavers constructed using these kind of permutation polynomials and functions show excellent agreement with our theoretical results.

  12. vTurbo: Accelerating Virtual Machine I/O Processing Using Designated Turbo-Sliced Core

    E-Print Network [OSTI]

    Cong Xu; Sahan Gamage; Hui Lu; Ramana Kompella; Dongyan Xu

    In a virtual machine (VM) consolidation environment, it has been observed that CPU sharing among multiple VMs will lead to I/O processing latency because of the CPU access latency experienced by each VM. In this paper, we present vTurbo, a system that accelerates I/O processing for VMs by offloading I/O processing to a designated core. More specifically, the designated core – called turbo core – runs with a much smaller time slice (e.g., 0.1ms) than the cores shared by production VMs. Most of the I/O IRQs for the production VMs will be delegated to the turbo core for more timely processing, hence accelerating the I/O processing for the production VMs. Our experiments show that vTurbo significantly improves the VMs ’ network and disk I/O throughput, which consequently translates into application-level performance improvement. 1

  13. Turbo Decoding for PR4: Parallel Versus Serial Concatenation Tom Souvignier

    E-Print Network [OSTI]

    Siegel, Paul H.

    Turbo Decoding for PR4: Parallel Versus Serial Concatenation Tom Souvignier , Arnon Friedmann Diego Quantum Corporation Seagate Technology Abstract -- Recent work on the application of turbo results comparing the parallel and serial concatenation systems will be presented. I. INTRODUCTION Turbo

  14. Irregular Turbo Codes in Block-Fading Channels

    E-Print Network [OSTI]

    Kraidy, Ghassan M; Fàbregas, Albert Guillén i

    2010-01-01T23:59:59.000Z

    We study irregular binary turbo codes over non-ergodic block-fading channels. We first propose an extension of channel multiplexers initially designed for regular turbo codes. We then show that, using these multiplexers, irregular turbo codes that exhibit a small decoding threshold over the ergodic Gaussian-noise channel perform very close to the outage probability on block-fading channels, from both density evolution and finite-length perspectives.

  15. Scaling Turbo Boost to a 1000 cores

    E-Print Network [OSTI]

    S, Ananth Narayan; Fedorova, Alexandra

    2010-01-01T23:59:59.000Z

    The Intel Core i7 processor code named Nehalem provides a feature named Turbo Boost which opportunistically varies the frequencies of the processor's cores. The frequency of a core is determined by core temperature, the number of active cores, the estimated power consumption, the estimated current consumption, and operating system frequency scaling requests. For a chip multi-processor(CMP) that has a small number of physical cores and a small set of performance states, deciding the Turbo Boost frequency to use on a given core might not be difficult. However, we do not know the complexity of this decision making process in the context of a large number of cores, scaling to the 100s, as predicted by researchers in the field.

  16. Analysis and Design of Tuned Turbo Codes

    E-Print Network [OSTI]

    Koller, Christian; Kliewer, Joerg; Vatta, Francesca; Zigangirov, Kamil S; Costello, Daniel J

    2010-01-01T23:59:59.000Z

    It has been widely observed that there exists a fundamental trade-off between the minimum distance properties and the iterative decoding convergence behavior of turbo-like codes. While capacity achieving code ensembles typically are asymptotically bad in the sense that their minimum distance does not grow linearly with block length, and they therefore exhibit an error floor at moderate-to-high signal to noise ratios, asymptotically good codes usually converge further away from channel capacity. In this paper, we introduce the concept of tuned turbo codes, a family of asymptotically good hybrid concatenated code ensembles, where minimum distance growth rates, convergence thresholds, and code rates can be traded-off using two tuning parameters, {\\lambda} and {\\mu}. By decreasing {\\lambda}, the asymptotic minimum distance growth rate is reduced for the sake of improved iterative decoding convergence behavior, while increasing {\\lambda} raises the growth rate at the expense of worse convergence behavior, and thus...

  17. ag turbo turbotech: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    decoding algorithm to converge, respectively. Here, we show that the entanglement-assisted paradigm gives a theoretical and practical "turbo boost" to these codes, in the sense...

  18. ag turbo ii: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    decoding algorithm to converge, respectively. Here, we show that the entanglement-assisted paradigm gives a theoretical and practical "turbo boost" to these codes, in the sense...

  19. High Compression Ratio Turbo Gasoline Engine Operation Using...

    Broader source: Energy.gov (indexed) [DOE]

    Compression Ratio Turbo Gasoline Engine Operation Using Alcohol Enhancement PI: John B. Heywood Sloan Automotive Laboratory Massachusetts Institute of Technology June 19, 2014...

  20. Critical Dynamics in the Early Universe

    E-Print Network [OSTI]

    B. L. Hu

    1993-02-22T23:59:59.000Z

    Methods and concepts for the study of phase transitions mediated by a time-dependent order-parameter field in curved spacetimes are discussed. A practical example is the derivation of an effective (quasi-)potential for the description of `slow-roll' inflation in the early universe. We first summarize our early results on viewing the symmetry behavior of constant background fields in curved but static spacetimes as finite size effect, and the use of derivative expansions for constructing effective actions for slowly-varying background fields. We then introduce the notion of dynamical finite size effect to explain how an exponential expansion of the scale factor imparts a finite size to the system and how the symmetry behavior in de Sitter space can be understood qualitatively in this light. We reason why the exponential inflation can be described equivalently by a scale transformation, thus rendering this special class of dynamics as effectively static. Finally we show how, in this view, one can treat the class of `slow-roll' inflation as a dynamic perturbation off the effectively static class of exponential inflation and understand it as a dynamical critical phenomenon in cosmology.

  1. 3D Duo Binary Turbo Decoder Hardware Implementation

    E-Print Network [OSTI]

    Timo Lehngik-emden; Matthias Alles; Norbert Wehn

    Abstract: Each digital communication system needs channel coding to provide a certain quality of service. With the introducation of advanced channel codes like turbo codes and LDPC codes, error correcting near theoretical shannon limit became possible. Many applications require a low error floor in addition. The classical turbo code cannot meet this demand. Increasing the number of components codes, non-binary component codes or code concatenation are solutions for this problem, but come with a large complexity increase. In 2007 a new class of turbo codes, the 3D turbo code, was introduced by Berrou. The 3D turbo code provides a very good convergence and a large minimum distance at a low complexity. To the best of our knowledge this paper presents the first hardware implementation of a 3D turbo decoder. In addition we compare the implementation complexity of the 3D turbo decoder with the 8 and 16-state duo binary turbo decoder on FPGA and in 65nm ASIC technology.

  2. Some Reflections on the Design of Bandwidth Efficient Turbo Codes

    E-Print Network [OSTI]

    Daniel J. Costello, Jr.; Adrish Banerjee; Thomas E. Fuja; Peter C. Massey

    In this paper we review several approaches to bandwidth efficient turbo coding that have appeared in the recent literature. In addition, some new designs using bit interleaved coded modulation are introduced, including asymmetric designs and low-complexity multiple turbo code designs.

  3. Hybrid Automatic Repeat Request Scheme With Turbo Codes

    E-Print Network [OSTI]

    Jozef Hamorsky; Udo Wachsmann; Johannes B. Huber; Anton Cizmar

    A novel hybrid automatic repeat request system based on turbo codes, called turbo HARQ system, is proposed. The iterative turbo decoding procedure is exploited to request retransmission of not decodable blocks without the necessity of an outer error--detecting code. It is shown that the turbo HARQ scheme with code rate R c = 1=2 and interleaver length 1024 significantly outperforms the classical turbo coding scheme --- especially for low SNR --- without essential loss in throughput. 1 INTRODUCTION Automatic repeat request (ARQ) protocols are well--known methods to achieve high reliability in digital transmission schemes. The information is protected by an error--detecting block code. If the decoder detects an erroneous transmitted block, retransmission of this block is requested via a feedback channel which is assumed to be error--free throughout this paper. Additionally, the request is assumed to be repeated until the decoder detects error--free transmission. The great advantage of s...

  4. The Quantum-Relativistic Dynamics of the Universe

    E-Print Network [OSTI]

    Skalsky, Vladimir

    2015-01-01T23:59:59.000Z

    From the analysis of the quantum and relativistic properties of the particles it results the unified quantum-relativistic dynamics of the physical reality (Universe).

  5. Frequency-Domain Turbo Equalisation in Coded SC-FDMA Systems: EXIT Chart Analysis and Performance

    E-Print Network [OSTI]

    Quartly, Graham

    Frequency-Domain Turbo Equalisation in Coded SC-FDMA Systems: EXIT Chart Analysis and Performance) turbo equalisers are considered. The first one is the turbo FD linear equaliser (LE). The second one is a parallel interference cancellation (PIC)-assisted turbo FD decision-feedback equaliser (DFE). The final one

  6. TURBO EQUALIZATIONWITH AN UNKNOWN CHANNEL SeongwookSong', Andrew C. Singer2,Koeng-MoSun?

    E-Print Network [OSTI]

    Singer, Andrew C

    TURBO EQUALIZATIONWITH AN UNKNOWN CHANNEL SeongwookSong', Andrew C. Singer2,Koeng-MoSun? l t 2Univ the method of turbo equalization originally de- veloped by Douillard, et al. [3]. In its original form, turbo and without training data. The resultingjoint channeland data estimator is shown to outperform standard turbo

  7. Space-Time Turbo Codes Youjian Liu and Michael P. Fitz

    E-Print Network [OSTI]

    Liu, Youjian "Eugene"

    Space-Time Turbo Codes Youjian Liu and Michael P. Fitz Department of Electrical Engineering. We propose a new class of scalable space{time codes based on turbo codes or turbo trellis codes 1]. They will be referred as space{time turbo codes (STT) in the sequel. The scalability implies that the code rate

  8. ENERGY EFFICIENT TURBO BASED SPACE-TIMECODER YumingZhu, Laura Li and ChaitaliChakrabarti

    E-Print Network [OSTI]

    Kambhampati, Subbarao

    ENERGY EFFICIENT TURBO BASED SPACE-TIMECODER YumingZhu, Laura Li and ChaitaliChakrabarti Department that Space-Time code is an effective approach to increasing the data rate over wireless channels. Turbo of the Turbo codes. In this paper, we compare two Turbo-based Space-Time Codes and their approximate versions

  9. Efficient SIMD technique with parallel Max-Log-MAP Algorithm for Turbo Decoders

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Efficient SIMD technique with parallel Max-Log-MAP Algorithm for Turbo Decoders David Gnaedig Turbo on a DSP a parallel Max-Log-MAP algorithm for turbo decoders. It consists in using SIMD instructions by the use of an adapted two-dimensional turbo code and its parallel interleaver structure. After a brief

  10. From Application to ASIP-based FPGA prototype: a Case Study on Turbo Decoding

    E-Print Network [OSTI]

    Muller, Olivier

    From Application to ASIP-based FPGA prototype: a Case Study on Turbo Decoding Olivier Muller, Amer turbo decoder. It introduces turbo decoding application and proposes an Application-Specific Instruction when decoding a double binary turbo code with 5 iterations. 1. Introduction Applications in the field

  11. 2090 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 57, NO. 7, JULY 2009 Turbo Receivers for

    E-Print Network [OSTI]

    Benoît, Escrig

    2090 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 57, NO. 7, JULY 2009 Turbo Receivers for Interleave turbo receivers for Interleave- Division Multiple-Access (IDMA) systems will be discussed. The multiple provides faster convergence of the turbo receiver. The discussed turbo receivers will be evaluated by means

  12. A New Stopping Criterion for Efficient Early Termination in Turbo Decoder Designs

    E-Print Network [OSTI]

    Hung, Shih-Hao

    A New Stopping Criterion for Efficient Early Termination in Turbo Decoder Designs Fan-Min Li and An, stopping criterion, early termination, Turbo codes, Turbo principle. 1. INTRODUCTION In 1993, a new class of Forward-Error-Correction (FEC) code, Turbo code, was introduced by Berrou, Glavieux and Thitimajashima [1

  13. Turbo-BLAST with Semi-Blind Co-Channel Interference Cancellation in Multicell MIMO Systems

    E-Print Network [OSTI]

    Dai, Huaiyu

    Turbo-BLAST with Semi-Blind Co-Channel Interference Cancellation in Multicell MIMO Systems Vivek to obtain in practice. In this paper we first exploit the turbo principle to enhance an effective blind detection method based on multiuser kurtosis (MUK) maximization, thus coined as turbo-MUK. In turbo

  14. AN ANALOG TURBO DECODER FOR AN (8,4) PRODUCT CODE Neiyer Correal and Joe Heck

    E-Print Network [OSTI]

    Valenti, Matthew C.

    AN ANALOG TURBO DECODER FOR AN (8,4) PRODUCT CODE Neiyer Correal and Joe Heck Florida@wvu.edu ABSTRACT This paper illustrates how analog circuitry can be used to decode turbo and turbo-like codes. INTRODUCTION Iteratively decodable codes, such as turbo [1] and low density parity check (LDPC) [2] codes

  15. Turbo Equalization of Non-Linear Satellite Channels using Soft Interference Cancellation

    E-Print Network [OSTI]

    Rontogiannis, Athanasios A.

    Turbo Equalization of Non-Linear Satellite Channels using Soft Interference Cancellation D by such channels is considered, by employing a soft interference canceller operating in a turbo equalization framework. I. INTRODUCTION Inspired by the advent of turbo codes [1], turbo equal- ization (TE) [2] has

  16. Space-Time Turbo Code Using Quantized Feedback with Two Transmit Antennas

    E-Print Network [OSTI]

    Lee, Jae Hong

    Space-Time Turbo Code Using Quantized Feedback with Two Transmit Antennas Chi Hoon Yoo and Jae Hong-time turbo code with two transmit antennas in a quasi- static Rayleigh fading channel. The performance for the space-time turbo code. To improve the perform- ance of the space-time turbo code, we propose the new

  17. CE Turbo Geothermal Facility | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to:EzfeedflagBiomassSustainable andBucoda,BurkeNebraska:CDM SustainableRelocation Permits toTurbo

  18. TurboGenix Inc | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty Edit withTianlin Baxin HydropowerTrinity ThermalTunisia-REEEP EnergyTurbo

  19. Gravitational Dynamics in an Expanding Universe

    E-Print Network [OSTI]

    T. Padmanabhan

    1995-10-05T23:59:59.000Z

    The dynamical evolution of collisionless particles in an expanding background is described. After discussing qualitatively the key features, the gravitational clustering of collisionless particles in an expanding universe is modelled using some simple physical ideas. I show that it is indeed possible to understand the nonlinear clustering in terms of three well defined regimes: (1) linear regime (2) quasilinear regime which is dominated by scale-invariant radial infall and (3) nonlinear regime dominated by nonradial motions and mergers. Modelling each of these regimes separately I show how the nonlinear two point correlation function can be related to the linear correlation function in hierarchical models. This analysis leads to results which are in good agreement with numerical simulations thereby providing an explanation for numerical results. The ideas presented here will also serve as a powerful analytical tool to investigate nonlinear clustering in different models. Several implications of the result are discussed.

  20. The Error-Pattern-Correcting Turbo Equalizer

    E-Print Network [OSTI]

    Alhussien, Hakim

    2010-01-01T23:59:59.000Z

    The error-pattern correcting code (EPCC) is incorporated in the design of a turbo equalizer (TE) with aim to correct dominant error events of the inter-symbol interference (ISI) channel at the output of its matching Viterbi detector. By targeting the low Hamming-weight interleaved errors of the outer convolutional code, which are responsible for low Euclidean-weight errors in the Viterbi trellis, the turbo equalizer with an error-pattern correcting code (TE-EPCC) exhibits a much lower bit-error rate (BER) floor compared to the conventional non-precoded TE, especially for high rate applications. A maximum-likelihood upper bound is developed on the BER floor of the TE-EPCC for a generalized two-tap ISI channel, in order to study TE-EPCC's signal-to-noise ratio (SNR) gain for various channel conditions and design parameters. In addition, the SNR gain of the TE-EPCC relative to an existing precoded TE is compared to demonstrate the present TE's superiority for short interleaver lengths and high coding rates.

  1. Performance Analyses of 38 kWe Turbo-Machine Unit for Space Reactor Power Systems

    SciTech Connect (OSTI)

    Gallo, Bruno M.; El-Genk, Mohamed S. [Institute for Space and Nuclear Power Studies and Chemical and Nuclear Engineering Department, University of New Mexico, Albuquerque, NM, 87131 (United States)

    2008-01-21T23:59:59.000Z

    This paper developed a design and investigated the performance of 38 kWe turbo-machine unit for space nuclear reactor power systems with Closed Brayton Cycle (CBC) energy conversion. The compressor and turbine of this unit are scaled versions of the NASA's BRU developed in the sixties and seventies. The performance results of turbo-machine unit are calculated for rotational speed up to 45 krpm, variable reactor thermal power and system pressure, and fixed turbine and compressor inlet temperatures of 1144 K and 400 K. The analyses used a detailed turbo-machine model developed at University of New Mexico that accounts for the various energy losses in the compressor and turbine and the effect of compressibility of the He-Xe (40 mole/g) working fluid with increased flow rate. The model also accounts for the changes in the physical and transport properties of the working fluid with temperature and pressure. Results show that a unit efficiency of 24.5% is achievable at rotation speed of 45 krpm and system pressure of 0.75 MPa, assuming shaft and electrical generator efficiencies of 86.7% and 90%. The corresponding net electric power output of the unit is 38.5 kWe, the flow rate of the working fluid is 1.667 kg/s, the pressure ratio and polytropic efficiency for the compressor are 1.60 and 83.1%, and 1.51 and 88.3% for the turbine.

  2. Coding Theorems for "Turbo-Like" Codes Dariush Divsalar, Hui Jin, and Robert J. McEliece

    E-Print Network [OSTI]

    Abu-Mostafa, Yaser S.

    Coding Theorems for "Turbo-Like" Codes Dariush Divsalar, Hui Jin, and Robert J. McEliece Jet call these systems "turbo-like" codes and they include as special cases both the classical turbo codes for turbo-like codes. 1. Introduction. The 1993 discovery of turbo codes by Berrou, Glavieux

  3. Turbo-generator control with variable valve actuation

    DOE Patents [OSTI]

    Vuk, Carl T. (Denver, IA)

    2011-02-22T23:59:59.000Z

    An internal combustion engine incorporating a turbo-generator and one or more variably activated exhaust valves. The exhaust valves are adapted to variably release exhaust gases from a combustion cylinder during a combustion cycle to an exhaust system. The turbo-generator is adapted to receive exhaust gases from the exhaust system and rotationally harness energy therefrom to produce electrical power. A controller is adapted to command the exhaust valve to variably open in response to a desired output for the turbo-generator.

  4. Aerospace & Energetics Research Program -University of Washington Plasma Dynamics Group

    E-Print Network [OSTI]

    Shumlak, Uri

    of Washington Plasma Dynamics Group q The Boltzmann equation is seven dimensional. q As a consequence plasmaAerospace & Energetics Research Program - University of Washington Plasma Dynamics Group Plasma Plasma Dynamics Group Abstract Many current plasma simulation codes are based on the magnetohydrodynamic

  5. Dynamics, Brandom-Style Bernhard Nickel Harvard University

    E-Print Network [OSTI]

    Nickel, Bernhard

    Dynamics, Brandom-Style Bernhard Nickel · Harvard University June 26, 2011 Abstract This paper understood as a special version of dynamic semantics, so that these semantics by themselves offer and motivations. Keywords static semantics · dynamic semantics · incompatibility se- mantics · brandom · norms

  6. Passionate Technologists Wanted at ASME Turbo Expo|GE Global...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Meet & Greet GE Researchers at ASME Turbo 2014 Thomas Ripplinger 2014.06.10 Do you love gas turbine research as much as I do? Then I want to meet you next week Since joining GE...

  7. COPYRIGHT 2006 by ASME Proceedings of ASME TURBO EXPO 2007

    E-Print Network [OSTI]

    Camci, Cengiz

    COPYRIGHT 2006 by ASME 1 Proceedings of ASME TURBO EXPO 2007 Power for Land, Sea, and Air May 14. [7] and Dorney and Schwab [8]. #12;COPYRIGHT 2006 by ASME 2 Due to significant energy extraction

  8. Development of Inexpensive Turbo Compressor/Expanders for Industrial Use

    E-Print Network [OSTI]

    Jacox, J. W.

    DEVELOPMENT OF INEXPENSIVE TURBO COMPRESSOR/EXPANDERS FOR INDUSTRIAL USE JOHN W. Senior Project Manager NUCON International, Columbus, ABSTRACT Use of Turbo Compressor/Expanders (TCEs) as industrial reversed Brayton Cycle Heat Pumps... offers many technical and energy saving advantages. until recently, such devices have been far too expensive in both capital cost and inefficiency mainly because the compressor and expander stages were built for forward Brayton Cycle operation...

  9. Leaking Interleavers for UEP Turbo Codes Abdul Wakeel, David Kronmueller, Werner Henkel, and Humberto Beltr~ao Neto

    E-Print Network [OSTI]

    Henkel, Werner

    Leaking Interleavers for UEP Turbo Codes Abdul Wakeel, David Kronmueller, Werner Henkel to Turbo coding's exceptional performance. An interleaver provides bit-permutation designed to ensure deterministic randomness. When applying interleavers to unequal error protecting (UEP) Turbo codes, typically

  10. Turbo Power Systems Inc formerly Turbo Genset Inc | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty Edit withTianlin Baxin HydropowerTrinity ThermalTunisia-REEEP EnergyTurbo Power

  11. Proceedings of GT2007 ASME Turbo Expo 2007: Power for Land, Sea and Air

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Proceedings of GT2007 ASME Turbo Expo 2007: Power for Land, Sea and Air May 14-17, 2007, Montreal manuscript, published in "Proceedings of GT2007, ASME Turbo Expo, Canada (2007)" #12;INTRODUCTION The current

  12. A study of Turbo Codes across Space Time Spreading Channel 1

    E-Print Network [OSTI]

    Ibrahim S. Raad; Peter Vial; Tad Wysocki

    This study looks at the use of Turbo Codes across a space time spreading (STS) channel in the absence of multi-path. For 3 and 5 iterations, turbo codes was shown to improve the BER by up to 3%.

  13. Turbo ASL: Arterial Spin Labeling With Higher SNR and Temporal Resolution

    E-Print Network [OSTI]

    Sereno, Martin

    Turbo ASL: Arterial Spin Labeling With Higher SNR and Temporal Resolution Eric C. Wong,* Wen the ASL SNR per image. We refer to this modified technique as turbo ASL. THEORY In pulsed ASL techniques

  14. Retrofit and Testing of a Pre-Turbo, Diesel Oxidation Catalyst...

    Broader source: Energy.gov (indexed) [DOE]

    Retrofit and Testing of a Pre-Turbo, Diesel Oxidation Catalyst on a Tier 0, SD60M Freight Locomotive Achieving Over 50% PM Reduction Retrofit and Testing of a Pre-Turbo, Diesel...

  15. Improved Space-time Turbo Codes with Full Spatial Diversity over Integer Ring

    E-Print Network [OSTI]

    Lee, Jae Hong

    Improved Space-time Turbo Codes with Full Spatial Diversity over Integer Ring Tae Min Kim and Jae-time turbo codes designed over integer ring for BPSK and QPSK modulation. The proposed spacetime turbo codes of 0.5 dB at FER of IO-$ over the space-time turbo codes with the iterative non-binary m a x i " D

  16. 1 Copyright 2003 by ASME Proceedings of ASME Turbo Expo 2003

    E-Print Network [OSTI]

    Roy, Subrata

    1 Copyright © 2003 by ASME Proceedings of ASME Turbo Expo 2003 Power for Land, Sea, and Air June 16

  17. Performance Analysis of 3-Dimensional Turbo Codes

    E-Print Network [OSTI]

    Rosnes, Eirik

    2011-01-01T23:59:59.000Z

    In this work, we consider the minimum distance properties and convergence thresholds of 3-dimensional turbo codes (3D-TCs), recently introduced by Berrou et al.. Here, we consider binary 3D-TCs while the original work of Berrou et al. considered double-binary codes. In the first part of the paper, the minimum distance properties are analyzed from an ensemble perspective, both in the finite-length regime and in the asymptotic case of large block lengths. In particular, we analyze the asymptotic weight distribution of 3D-TCs and show numerically that their typical minimum distance dmin may, depending on the specific parameters, asymptotically grow linearly with the block length, i.e., the 3D-TC ensemble is asymptotically good for some parameters. In the second part of the paper, we derive some useful upper bounds on the dmin when using quadratic permutation polynomial (QPP) interleavers with a quadratic inverse. Furthermore, we give examples of interleaver lengths where an upper bound appears to be tight. The b...

  18. Study of Turbo Coded OFDM over Fading Channel

    E-Print Network [OSTI]

    Suchita Chatterjee; Mangal Singh

    Abstract––The main problems of reliable data communication in the wireless environment are the distorting multipath fading channel and Additive White Gaussian Noise (AWGN) noise. These impairments can distort the transmitted signal severely and thus leading to Inter Symbol Interference (ISI). So the reception becomes erroneous and the Bit Error Rate (BER) increases. Orthogonal Frequency Division Multiplexing (OFDM) or multicarrier communication is a recent technique used to mitigate ISI introduced by the distorting frequency selective fading channel. The earlier approaches used to combat ISI are based on Equalization and Maximum Likelihood Sequence Estimation (MLSE). Though MLSE is the optimum detector, its complexity grows exponentially with the channel length. Equalization has a low complexity but is suboptimal. OFDM essentially bridges the performance gap between MLSE and Equalization at a reasonable complexity. In this paper, we attempt to study the performance of uncoded and turbo coded OFDM signal transmitted through frequency selective Rayleigh fading channels having uniform power delay profile. The channel is assumed to be static for one OFDM symbol and varies randomly from one symbol to the next. Simulation results are presented for rate 1/3 and rate 1/2 turbo code. Keywords––Turbo codes, turbo encoder, fading channel, turbo decoder, MAP algorithm, likelihood ratio. I.

  19. Optimum Frame Synchronization for Preamble-less Packet Transmission of Turbo Codes

    E-Print Network [OSTI]

    Valenti, Matthew C.

    Optimum Frame Synchronization for Preamble-less Packet Transmission of Turbo Codes Jian Sun introduces an optimum maximum a posteriori (MAP) frame synchronization method for packet- based turbo coded the received signal sequences. This method is based on the low- density parity-check properties of turbo codes

  20. Packet Transmission with Turbo Codes over Fading Bartosz Mielczarek 1 and Arne Svensson 2

    E-Print Network [OSTI]

    Packet Transmission with Turbo Codes over Fading Channels Bartosz Mielczarek 1 and Arne Svensson 2.se. Abstract This paper presents the main issues of using turbo coding schemes in wireless packet transmission it particu- larly suitable for packet transmission. 1 Introduction Turbo codes [1, 2] are one of the most

  1. Power and Area Efficient Turbo Decoder Implementation for Mobile Wireless Systems

    E-Print Network [OSTI]

    Arslan, Tughrul

    Power and Area Efficient Turbo Decoder Implementation for Mobile Wireless Systems J. H. Han1 , A. T Abstract-- The authors present a low power and area efficient turbo soft-input soft-output (SISO) decoder. Our turbo SISO decoder is based on trace back algorithm (TBA) and saves area and power by replacing

  2. The Distribution of Loop Lengths in Graphical Models for Turbo Decoding

    E-Print Network [OSTI]

    Smyth, Padhraic

    1 The Distribution of Loop Lengths in Graphical Models for Turbo Decoding Xianping Ge, David model for a K = 6, N = 12, rate 1=2 turbo code. Abstract| This paper analyzes the distribution of loop lengths in graphical models for turbo decoding. The prop- erties of such loops are of signi#12;cant

  3. Performance of Turbo Coded WCDMA with Downlink Space Time Block Coding in Correlated Fading Channels

    E-Print Network [OSTI]

    Mandayam, Narayan

    Performance of Turbo Coded WCDMA with Downlink Space Time Block Coding in Correlated Fading due to potential high data rate applications such as wireless internet access. Turbo codes. In this paper, we evaluate the performance of turbo coded WCDMA systems with downlink transmit diversity

  4. IEEE COMMUNICATIONS LETTERS, TO APPEAR 1 Soft-Decision COVQ for Turbo-Coded AWGN

    E-Print Network [OSTI]

    Linder, Tamás

    IEEE COMMUNICATIONS LETTERS, TO APPEAR 1 Soft-Decision COVQ for Turbo-Coded AWGN and Rayleigh-decision channel-optimized vec- tor quantization (COVQ) scheme for Turbo-coded additive white Gaussian noise (AWGN) and Rayleigh fading chan- nels is proposed. The log likelihood ratio (LLR) gener- ated by the Turbo decoder

  5. Unified Convolutional/Turbo Decoder Architecture Design Based on Triple-Mode MAP/VA Kernel

    E-Print Network [OSTI]

    Hung, Shih-Hao

    Unified Convolutional/Turbo Decoder Architecture Design Based on Triple-Mode MAP/VA Kernel Fan convolutional/ turbo decoder design. According to the triple-mode MAP/VA timing chart and by merging some similar modules in both the Viterbi decoder and the log-MAP turbo code decoder, we build one unified

  6. Stochastic decoding of Turbo Codes Quang Trung DONG, Matthieu ARZEL*, Christophe JEGO and Warren J. GROSS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Stochastic decoding of Turbo Codes Quang Trung DONG, Matthieu ARZEL*, Christophe JEGO and Warren the application of the stochastic decoding approach to the families of convolutional codes and turbo codes. It demonstrates that stochastic compu- tation is a promising solution to improve the data throughput of turbo

  7. 754 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 49, NO. 5, MAY 2001 Turbo-SPC Codes

    E-Print Network [OSTI]

    Ping, Li

    754 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 49, NO. 5, MAY 2001 Turbo-SPC Codes Li Ping, Member, IEEE Abstract--This letter is concerned with a family of modified turbo-type codes, referred to as turbo-SPC (single parity check) codes. A technique based on the SPC code is introduced to re- place

  8. Butterfly and Benes-Based on-Chip Communication Networks for Multiprocessor Turbo Decoding

    E-Print Network [OSTI]

    Muller, Olivier

    Butterfly and Benes-Based on-Chip Communication Networks for Multiprocessor Turbo Decoding Hazem interconnection networks as on-chip communication networks for parallel turbo decoding. Adapted Benes for all turbo code standards and constitutes a promising feature for their reuse for any similar

  9. Reed-Solomon Turbo Product Codes for Optical Communications: From Code Optimization to

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Reed-Solomon Turbo Product Codes for Optical Communications: From Code Optimization to Decoder Design Rapha¨el Le Bidan, Camille Leroux, Christophe J´ego, Patrick Adde, Ramesh Pyndiah Abstract--Turbo. In this paper, we investi- gate the use of Reed-Solomon (RS) turbo product codes for 40 Gb/s transmission over

  10. Turbo Codes for Binary Markov Sources 1 Guang-Chong Zhu and Fady Alajaji

    E-Print Network [OSTI]

    Linder, Tamás

    Turbo Codes for Binary Markov Sources 1 Guang-Chong Zhu and Fady Alajaji Dept. of Mathematics@mast.queensu.ca Abstract | The reliable transmission via Turbo codes of binary stationary ergodic Markov sources over noisy channels is investigated. The #12;rst con- stituent Turbo decoder is designed to exploit the source

  11. A Union Bound Approximation for Rapid Performance Evaluation of Punctured Turbo Codes

    E-Print Network [OSTI]

    Cambridge, University of

    A Union Bound Approximation for Rapid Performance Evaluation of Punctured Turbo Codes Ioannis a simple technique to approximate the performance union bound of a punctured turbo code. The bound to calculate the most significant terms of the transfer function of a turbo encoder. We demonstrate that

  12. Improved Upper Bounds on the ML Decoding Error Probability of Parallel and Serial Concatenated Turbo

    E-Print Network [OSTI]

    Sason, Igal

    Turbo Codes via their Ensemble Distance Spectrum Igal Sason and Shlomo Shamai (Shitz) Department The ensemble performance of parallel and serial concatenated turbo codes is considered, where the ensemble enumeration functions of the ensembles of random parallel and serial concatenated turbo codes,the tangential

  13. Bounds on the Error Probability of ML Decoding for Block and Turbo-Block Codes

    E-Print Network [OSTI]

    Sason, Igal

    Bounds on the Error Probability of ML Decoding for Block and Turbo-Block Codes Igal Sason 32000, Israel March 1999 Abstract The performance of either structured or random turbo-block codes on the other. We focus here on uniformly interleaved and parallel concatenated turbo-Hamming codes

  14. A New Technique To Determine The Upper Threshold for Finite Length Turbo Codes

    E-Print Network [OSTI]

    Chaturvedi, A K

    A New Technique To Determine The Upper Threshold for Finite Length Turbo Codes A.Rajeshand A in finite frame length turbo codes. These thresholds depend on the component encoder as well as the frame to indecisive and unequivocal fixed points respectively, for finiteframe length turbo codes. Concurrently, Gamal

  15. Layered Frequency-Domain Turbo Equalization for Single Carrier Broadband MIMO Systems

    E-Print Network [OSTI]

    Zheng, Yahong Rosa

    Layered Frequency-Domain Turbo Equalization for Single Carrier Broadband MIMO Systems Jian Zhang 72701, USA Abstract-- A new layered frequency-domain turbo equalization (LFDTE) scheme is proposed the respective advantages of layered detection and turbo equalization to further lower the bit error rate (BER

  16. Turbo Codes are Low Density Parity Check Codes David J. C. MacKay

    E-Print Network [OSTI]

    MacKay, David J.C.

    Turbo Codes are Low Density Parity Check Codes David J. C. MacKay July 8, 1998--- Draft 0.2, not for distribution! (First draft written July 5, 1998) Abstract Turbo codes and Gallager codes (also known as low note that the parity check matrix of a Turbo code can be written as low density parity check matrix

  17. IEEE COMMUNICATIONS LETTERS, VOL. 6, NO. 11, NOVEMBER 2002 503 Channel Reliability Estimation for Turbo Decoding

    E-Print Network [OSTI]

    Lee, Jae Hong

    for Turbo Decoding in Rayleigh Fading Channels With Imperfect Channel Estimates Hyundong Shin, Student scheme of the channel reliability factor for turbo decoding in Rayleigh fading channels with imperfect channel estimates. The channel re- liability factor is required for iterative MAP decoding of turbo codes

  18. High Speed Max-Log-MAP Turbo SISO Decoder Implementation Using Branch Metric Normalization

    E-Print Network [OSTI]

    Arslan, Tughrul

    High Speed Max-Log-MAP Turbo SISO Decoder Implementation Using Branch Metric Normalization J. H.Erdogan@ee.ed.ac.uk, Tughrul.Arslan@ee.ed.ac.uk Abstract The authors present a turbo soft-in soft-out (SISO) decoder based. The turbo decoder with the proposed technique has been synthesized to evaluate its power consumption

  19. CONCATENATED CODES BASED ON MULTIDIMENSIONAL PARITY-CHECK CODES AND TURBO CODES

    E-Print Network [OSTI]

    Wong, Tan F.

    CONCATENATED CODES BASED ON MULTIDIMENSIONAL PARITY-CHECK CODES AND TURBO CODES John M. Shea, Florida Abstract--Turbo-codes provide communications near capac- ity when very large interleavers (and parity-check code can be used as an outer code with a turbo code as an inner code in a serial

  20. ASIP-Based Multiprocessor SoC Design for Simple and Double Binary Turbo Decoding

    E-Print Network [OSTI]

    Muller, Olivier

    ASIP-Based Multiprocessor SoC Design for Simple and Double Binary Turbo Decoding Olivier Muller presents a new multiprocessor platform for high throughput turbo decoding. The proposed platform is based the recent shuffling technique introduced in the turbo-decoding field to reduce communication latency

  1. TDA Progress Report 42-122 August 15, 1995 Weight Distributions for Turbo Codes Using

    E-Print Network [OSTI]

    Li, Tiffany Jing

    TDA Progress Report 42-122 August 15, 1995 Weight Distributions for Turbo Codes Using Random takes a preliminary look at the weight distributions achievable for turbo codes using random, nonrandom to being foiled by higher-weight inputs. I. Introduction Turbo codes are constructed by applying two

  2. Decoding Turbo-Like Codes via Linear Programming Jon Feldman David R. Karger

    E-Print Network [OSTI]

    Decoding Turbo-Like Codes via Linear Programming Jon Feldman David R. Karger MIT Laboratory algorithm for decoding turbo-like codes based on linear programming. We prove that for the case of Repeat is the path corresponding to the original transmitted code word. 1 Introduction The introduction of turbo

  3. EXIT Chart Analysis of Turbo-BLAST Receivers in Rayleigh Fading Channels

    E-Print Network [OSTI]

    Dai, Huaiyu

    EXIT Chart Analysis of Turbo-BLAST Receivers in Rayleigh Fading Channels Wenjun Li and Huaiyu Dai: Wli5@ncsu.edu, Huaiyu Dai@ncsu.edu Abstract-- Turbo-BLAST is an advanced space-time layered with Turbo-BLAST to combat the co-channel interference (CCI) and significantly improve the performance

  4. High-Throughput Contention-Free Concurrent Interleaver Architecture for Multi-Standard Turbo Decoder

    E-Print Network [OSTI]

    Mellor-Crummey, John

    High-Throughput Contention-Free Concurrent Interleaver Architecture for Multi-Standard Turbo paral- lel turbo decoder architectures have been developed. However, the interleaver has become a major that can efficiently solve the memory conflict problem for parallel turbo decoders with very high

  5. Turbo-SMT: Accelerating Coupled Sparse Matrix-Tensor Factorizations by 200x

    E-Print Network [OSTI]

    Turbo-SMT: Accelerating Coupled Sparse Matrix-Tensor Factorizations by 200x Evangelos E maintaining good accuracy? We intro- duce Turbo-SMT, a meta-method capable of doing exactly that: it boosts, with comparable accuracy to the baseline. We apply Turbo-SMT to BrainQ, a dataset consisting of a (nouns, brain

  6. Turbo Pump Magnetic Shielding Analysis NSTX-CALC-24-04-00

    E-Print Network [OSTI]

    Princeton Plasma Physics Laboratory

    NSTX Turbo Pump Magnetic Shielding Analysis NSTX-CALC-24-04-00 March 16, 2011 Prepared By turbo pump to reduce the fringe field from NSTX coils at the pump location to below 50 gauss to be at least 12 inches longer than the pump (6 inches above the top and below the bottom of the turbo pump

  7. ITW2003, Paris, France, March 31 April 4, 2003 Punctured Turbo Code Ensembles

    E-Print Network [OSTI]

    Soljanin, Emina

    ITW2003, Paris, France, March 31 ­ April 4, 2003 Punctured Turbo Code Ensembles Ruoheng Liu the asymptotic performance of punctured turbo codes. The analysis is based on the union bound on the word error probability of maximum likelihood decoding for a punctured turbo code ensem- bles averaged over all possible

  8. IEEE VEHICULAR TECHNOLOGY CONFERENCE SPRING, 2003 1 Space-Time Block Coding applied to Turbo Coded

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    IEEE VEHICULAR TECHNOLOGY CONFERENCE SPRING, 2003 1 Space-Time Block Coding applied to Turbo Coded and a Turbo Code (TC) as channel code. MC-CDMA is likely to be one of the most promising access technique. Then, since Turbo Coded MC-CDMA was demonstrated to be very efficient for a Single Input Single Output

  9. The Augmented State Diagram and its Application to Convolutional and Turbo Codes

    E-Print Network [OSTI]

    Cambridge, University of

    1 The Augmented State Diagram and its Application to Convolutional and Turbo Codes Ioannis Abstract Convolutional block codes, which are commonly used as constituent codes in turbo code configu code. In the case of a turbo code, we can readily calculate an upper bound to its bit error rate

  10. Parallel Interleaver Architecture with New Scheduling Scheme for High Throughput Configurable Turbo Decoder

    E-Print Network [OSTI]

    Mellor-Crummey, John

    Parallel Interleaver Architecture with New Scheduling Scheme for High Throughput Configurable Turbo}@rice.edu, yuanbinguo@huawei.com Abstract--Parallel architecture is required for high throughput turbo decoder to meet also shows great flexibility and scalability compared to prior work. Index Terms--VLSI, turbo decoder

  11. Priberam: A Turbo Semantic Parser with Second Order Features Andre F. T. Martins

    E-Print Network [OSTI]

    Murphy, Robert F.

    Priberam: A Turbo Semantic Parser with Second Order Features Andr´e F. T. Martins Mariana S. C a recently pro- posed dependency parser, TurboParser (Martins et al., 2010, 2013), to be able to perform). The result is TurboSemanticParser, which we re- lease as open-source software.1 We describe here a second

  12. Highly Scalable On-the-Fly Interleaved Address Generation for UMTS/HSPA+ Parallel Turbo Decoder

    E-Print Network [OSTI]

    Mellor-Crummey, John

    Highly Scalable On-the-Fly Interleaved Address Generation for UMTS/HSPA+ Parallel Turbo Decoder@huawei.com Abstract-- High throughput parallel interleaver design is a major challenge in designing parallel turbo the silicon area and frequency is improved compared to recent related works. Keywords--Turbo decoder

  13. The Minimum Distance of Turbo-Like Codes Louay Bazzi, Mohammad Mahdian, Daniel A. Spielman

    E-Print Network [OSTI]

    Spielman, Daniel A.

    1 The Minimum Distance of Turbo-Like Codes Louay Bazzi, Mohammad Mahdian, Daniel A. Spielman Abstract--Worst-case upper bounds are derived on the minimum distance of parallel concatenated Turbo codes that parallel-concatenated Turbo codes and repeat-convolute codes with sub-linear memory are asymptotically bad

  14. 174 IEEE COMMUNICATIONS LETTERS, VOL. 8, NO. 3, MARCH 2004 Modified LMMSE Turbo Equalization

    E-Print Network [OSTI]

    Ping, Li

    174 IEEE COMMUNICATIONS LETTERS, VOL. 8, NO. 3, MARCH 2004 Modified LMMSE Turbo Equalization Sen a modified linear minimum mean square error (LMMSE) turbo equalization scheme that uses an augmented real retaining a complexity similar to that of the existing LMMSE turbo equalization scheme. Index Terms

  15. Linear Equalizers for Turbo Equalization A New Optimization Criterion for Determining the Equalizer Taps

    E-Print Network [OSTI]

    Raphaeli, Dan

    Linear Equalizers for Turbo Equalization A New Optimization Criterion for Determining the Equalizer: This paper investigates the subject of turbo equalizations in which a receiver combines the equalization for parallel-concatenated turbo code with BPSK modulation over channels that introduce severe amplitude

  16. On the higher ef ciency of parallel Reed-Solomon turbo-decoding

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    On the higher ef ciency of parallel Reed-Solomon turbo-decoding Camille LEROUX, Christophe JEGO.lastname@telecom-bretagne.eu Abstract-- In this paper, we demonstrate the higher hardware ef ciency of Reed-Solomon (RS) parallel turbo decoding compared with BCH parallel turbo decoding. Based on an innovative ar- chitecture, this is the rst

  17. SWITCHING LMS LINEAR TURBO EQUALIZATION Seok-Jun Lee, Andrew C. Singer, and Naresh R. Shanbhag

    E-Print Network [OSTI]

    Singer, Andrew C

    SWITCHING LMS LINEAR TURBO EQUALIZATION Seok-Jun Lee, Andrew C. Singer, and Naresh R. Shanbhag-Champaign 1308 West Main Street, Urbana, IL 61801 Email: [slee6,acsinger,shanbhag]@uiuc.edu ABSTRACT Turbo symbol for each iteration. In this paper, we consider a class of turbo equal- ization algorithms in which

  18. Turbo Receiver Design for Phase Noise Mitigation in OFDM Systems

    E-Print Network [OSTI]

    Sridharan, Gokul

    2010-01-01T23:59:59.000Z

    This paper addresses the issue of phase noise in OFDM systems. Phase noise (PHN) is a transceiver impairment resulting from the non-idealities of the local oscillator. We present a case for designing a turbo receiver for systems corrupted by phase noise by taking a closer look at the effects of the common phase error (CPE). Using an approximate probabilistic framework called variational inference (VI), we develop a soft-in soft-out (SISO) algorithm that generates posterior bit-level soft estimates while taking into account the effect of phase noise. The algorithm also provides an estimate of the phase noise sequence. Using this SISO algorithm, a turbo receiver is designed by passing soft information between the SISO detector and an outer forward error correcting (FEC) decoder that uses a soft decoding algorithm. It is shown that the turbo receiver achieves close to optimal performance.

  19. Low Complexity Turbo-Equalization: A Clustering Approach

    E-Print Network [OSTI]

    Kim, Kyeongyeon; Kozat, Suleyman S; Singer, Andrew C

    2012-01-01T23:59:59.000Z

    We introduce a low complexity approach to iterative equalization and decoding, or "turbo equalization", that uses clustered models to better match the nonlinear relationship that exists between likelihood information from a channel decoder and the symbol estimates that arise in soft-input channel equalization. The introduced clustered turbo equalizer uses piecewise linear models to capture the nonlinear dependency of the linear minimum mean square error (MMSE) symbol estimate on the symbol likelihoods produced by the channel decoder and maintains a computational complexity that is only linear in the channel memory. By partitioning the space of likelihood information from the decoder, based on either hard or soft clustering, and using locally-linear adaptive equalizers within each clustered region, the performance gap between the linear MMSE equalizer and low-complexity, LMS-based linear turbo equalizers can be dramatically narrowed.

  20. Soft-Decision-Driven Channel Estimation for Pipelined Turbo Receivers

    E-Print Network [OSTI]

    Yoon, Daejung

    2011-01-01T23:59:59.000Z

    We consider channel estimation specific to turbo equalization for multiple-input multiple-output (MIMO) wireless communication. We develop a soft-decision-driven sequential algorithm geared to the pipelined turbo equalizer architecture operating on orthogonal frequency division multiplexing (OFDM) symbols. One interesting feature of the pipelined turbo equalizer is that multiple soft-decisions become available at various processing stages. A tricky issue is that these multiple decisions from different pipeline stages have varying levels of reliability. This paper establishes an effective strategy for the channel estimator to track the target channel, while dealing with observation sets with different qualities. The resulting algorithm is basically a linear sequential estimation algorithm and, as such, is Kalman-based in nature. The main difference here, however, is that the proposed algorithm employs puncturing on observation samples to effectively deal with the inherent correlation among the multiple demappe...

  1. Designing Nonlinear Turbo Codes with a Target Ones Density

    E-Print Network [OSTI]

    Wang, Jiadong; Chen, Tsung-Yi; Xie, Bike; Wesel, Richard

    2011-01-01T23:59:59.000Z

    Certain binary asymmetric channels, such as Z-channels in which one of the two crossover probabilities is zero, demand optimal ones densities different from 50%. Some broadcast channels, such as broadcast binary symmetric channels (BBSC) where each component channel is a binary symmetric channel, also require a non-uniform input distribution due to the superposition coding scheme, which is known to achieve the boundary of capacity region. This paper presents a systematic technique for designing nonlinear turbo codes that are able to support ones densities different from 50%. To demonstrate the effectiveness of our design technique, we design and simulate nonlinear turbo codes for the Z-channel and the BBSC. The best nonlinear turbo code is less than 0.02 bits from capacity.

  2. 2490 IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 50, NO. 10, OCTOBER 2004 Performance Analysis of Turbo-SPC Codes

    E-Print Network [OSTI]

    Ping, Li

    of Turbo-SPC Codes Keying Wu, Student Member, IEEE, Li Ping, Member, IEEE, Xiaoling Huang, and Nam Phamdo, Senior Member, IEEE Abstract--This correspondence concerns the performance analysis of turbo used in turbo-SPC codes is discussed. It is shown that simple two- or four-state turbo-SPC codes

  3. EXIT Charts for Turbo Trellis Coded Modulation Hangjun Chen, Student Member, IEEE, and Alexander Haimovich, Senior Member, IEEE

    E-Print Network [OSTI]

    Haimovich, Alexander

    EXIT Charts for Turbo Trellis Coded Modulation Hangjun Chen, Student Member, IEEE, and Alexander information transfer charts (EXIT) method to the analysis of the convergence of turbo codes to turbo trellis can be used as a tool in the design of TTCM. Index Terms-- Turbo trellis coded modulation, convergence

  4. The minimum distance of classical and quantum turbo-codes

    E-Print Network [OSTI]

    Abbara, Mamdouh

    2011-01-01T23:59:59.000Z

    We present a theory of quantum stabilizer turbo-encoders with unbounded minimum distance. This theory is presented under a framework common to both classical and quantum turbo-encoding theory. The main conditions to have an unbounded minimum distance are that the inner seed encoder has to be recursive, and either systematic or with a totally recursive truncated decoder. This last condition has been introduced in order to obtain a theory viable in the quantum stabilizer case, since it was known that in this case the inner seed encoder could not be recursive and systematic in the same time.

  5. Precoded Turbo Equalizer for Power Line Communication Systems

    E-Print Network [OSTI]

    Xie, Kai; Li,

    2010-01-01T23:59:59.000Z

    Power line communication continues to draw increasing interest by promising a wide range of applications including cost-free last-mile communication solution. However, signal transmitted through the power lines deteriorates badly due to the presence of severe inter-symbol interference (ISI) and harsh random pulse noise. This work proposes a new precoded turbo equalization scheme specifically designed for the PLC channels. By introducing useful precoding to reshape ISI, optimizing maximum {\\it a posteriori} (MAP) detection to address the non-Gaussian pulse noise, and performing soft iterative decision refinement, the new equalizer demonstrates a gain significantly better than the existing turbo equalizers.

  6. The minimum distance of classical and quantum turbo-codes

    E-Print Network [OSTI]

    Mamdouh Abbara; Jean-Pierre Tillich

    2011-09-01T23:59:59.000Z

    We present a theory of quantum stabilizer turbo-encoders with unbounded minimum distance. This theory is presented under a framework common to both classical and quantum turbo-encoding theory. The main conditions to have an unbounded minimum distance are that the inner seed encoder has to be recursive, and either systematic or with a totally recursive truncated decoder. This last condition has been introduced in order to obtain a theory viable in the quantum stabilizer case, since it was known that in this case the inner seed encoder could not be recursive and systematic in the same time.

  7. Polymer Quantum Dynamics of the Taub Universe

    E-Print Network [OSTI]

    Marco Valerio Battisti; Orchidea Maria Lecian; Giovanni Montani

    2008-11-17T23:59:59.000Z

    Within the framework of non-standard (Weyl) representations of the canonical commutation relations, we investigate the polymer quantization of the Taub cosmological model. The Taub model is analyzed within the Arnowitt-Deser-Misner reduction of its dynamics, by which a time variable arises. While the energy variable and its conjugate momentum are treated as ordinary Heisenberg operators, the anisotropy variable and its conjugate momentum are represented by the polymer technique. The model is analyzed at both classical and quantum level. As a result, classical trajectories flatten with respect to the potential wall, and the cosmological singularity is not probabilistically removed. In fact, the dynamics of the wave packets is characterized by an interference phenomenon, which, however, is not able to stop the evolution towards the classical singularity.

  8. Universal dynamical decoupling of multiqubit states from environment

    E-Print Network [OSTI]

    Liang Jiang; Adilet Imambekov

    2011-12-29T23:59:59.000Z

    We study the dynamical decoupling of multiqubit states from environment. For a system of m qubits, the nested Uhrig dynamical decoupling (NUDD) sequence can efficiently suppress generic decoherence induced by system-environment interaction to order N using (N+1)^2m pulses. We prove that the NUDD sequence is universal, i.e., it can restore the coherence of m-qubit quantum system independent of the details of system-environment interaction. We also construct a general mapping between dynamical decoupling problems and discrete quantum walks in certain functional spaces.

  9. Power Control for Turbo Coded Symmetrical Collaborative Networks

    E-Print Network [OSTI]

    Cambridge, University of

    Power Control for Turbo Coded Symmetrical Collaborative Networks Weisi Guo1, Ioannis Chatzigeorgiou, we explore the performance of adaptive power control for decode-and-forward (DF) col- laborative. We conclude that power control can greatly benefit a DF collaborative network in a block fading

  10. Improving Turbocharged Diesel Engine Operation with Turbo Power Assist System

    E-Print Network [OSTI]

    Stefanopoulou, Anna

    Improving Turbocharged Diesel Engine Operation with Turbo Power Assist System I. Kolmanovsky A. G Engineering, UC, Santa Barbara Abstract The paper investigates improvements in the tur- bocharged diesel problem. Comparison with a conventional turbocharged diesel engine reveals the mechanism by which

  11. ALERTEES PAR LA MORT CELLULAIRE, NOS DEFENSES ANTIVIRALES METTENT LE TURBO

    E-Print Network [OSTI]

    Loewith, Robbie

    MORT CELLULAIRE, NOS DEFENSES ANTIVIRALES METTENT LE TURBO Genève, le 9 février 2012 SOUS EMBARGO JUSQU

  12. Die MAN Diesel & Turbo sucht am Standort Augsburg fr den Bereich Strategie/Unternehmensentwicklung zum frhestmglichen Eintrittstermin eine/n

    E-Print Network [OSTI]

    Stein, Oliver

    Die MAN Diesel & Turbo sucht am Standort Augsburg für den Bereich Strategie Projekte. Als Stabsfunktion berichtet die Abteilung direkt an den Vorstand von MAN Diesel & Turbo SE. Wir Diesel & Turbo ist weltweit führender Anbieter von Großdieselmotoren und Turbomaschinen für maritime und

  13. SWITCHING METHODS FOR LINEAR TURBO EQUALIZATION Seok-Jun Lee, Naresh R. Shanbhag, and Andrew C. Singer

    E-Print Network [OSTI]

    Singer, Andrew C

    SWITCHING METHODS FOR LINEAR TURBO EQUALIZATION Seok-Jun Lee, Naresh R. Shanbhag, and Andrew C,acsinger]@uiuc.edu ABSTRACT In this paper, several switching methods are presented for a class of switching turbo equalization the best bit error rate (1.5dB processing gain at 10-4 ) with low complexity. 1. INTRODUCTION The turbo

  14. Interleaver Design for Turbo Codes H. R. Sadjadpour, N. J. A. Sloane, M. Salehi, and G. Nebe

    E-Print Network [OSTI]

    Sloane, Neil J. A.

    1 Interleaver Design for Turbo Codes H. R. Sadjadpour, N. J. A. Sloane, M. Salehi, and G. Nebe H DRAFT #12; 2 Abstract The performance of a Turbo code with short block length depends critically corresponding to its parity bits. This paper describes a new interleaver design for Turbo codes with short block

  15. 2570 IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 58, NO. 5, MAY 2012 The Performance of Serial Turbo Codes

    E-Print Network [OSTI]

    Como, Giacomo

    Turbo Codes Does Not Concentrate Federica Garin, Giacomo Como, and Fabio Fagnani Abstract--Minimum distances and maximum likelihood error probabilities of serial turbo codes with uniform interleaver are an, the minimum distance of se- rial turbo codes grows as a positive power of their block-length, while

  16. Performance of Turbo Product Codes on the Multiple-Access Relay Channel with Relatively Poor Source-Relay Links

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Performance of Turbo Product Codes on the Multiple-Access Relay Channel with Relatively Poor Source.amis}@telecom-bretagne.eu Abstract--In this paper, we study a cooperative coding scheme based on turbo product codes where a number by the turbo decoder. The error performance under the degraded source-relay channel condition is shown

  17. 2212 IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 46, NO. 6, SEPTEMBER 2000 The Super-Trellis Structure of Turbo Codes

    E-Print Network [OSTI]

    Verdú, Sergio

    -Trellis Structure of Turbo Codes Marco Breiling, Student Member, IEEE, and Lajos Hanzo, Senior Member, IEEE Abstract--In this contribution we derive the super-trellis structure of turbo codes. We show that this structure and its associated decoding com- plexity depend strongly on the interleaver applied in the turbo encoder. We provide

  18. IEEE COMMUNICATIONS LETTERS, VOL. 5, NO. 6, JUNE 2001 257 Soft-Decision COVQ for Turbo-Coded AWGN and

    E-Print Network [OSTI]

    Alajaji, Fady

    IEEE COMMUNICATIONS LETTERS, VOL. 5, NO. 6, JUNE 2001 257 Soft-Decision COVQ for Turbo-Coded AWGN-decision channel-optimized vector quantization (COVQ) scheme for Turbo-coded additive white Gaussian noise (AWGN) and Rayleigh fading channels is pro- posed. The log likelihood ratio (LLR) generated by the Turbo decoder

  19. 160 IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 16, NO. 2, FEBRUARY 1998 Design and Analysis of Turbo

    E-Print Network [OSTI]

    Wilson, Stephen G.

    and Analysis of Turbo Codes on Rayleigh Fading Channels Eric K. Hall and Stephen G. Wilson, Member, IEEE Abstract--The performance and design of turbo codes using coherent BPSK signaling on the Rayleigh fading turbo coding systems. For higher signal- to-noise regions beyond simulation capabilities, an average

  20. 1932 IEEE TRANSACTIONS ON MAGNETICS, VOL. 37, NO. 4, JULY 2001 On the Performance of Turbo Product Codes over

    E-Print Network [OSTI]

    Li, Tiffany Jing

    1932 IEEE TRANSACTIONS ON MAGNETICS, VOL. 37, NO. 4, JULY 2001 On the Performance of Turbo Product. Georghiades Abstract--This paper evaluates the performance of single-parity check turbo product codes (TPC with PR4/EPR4 channels with proper precoding and with turbo equalization. Gains of 4.5 to 5 d

  1. IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 19, NO. 5, MAY 2001 831 Interleaver Design for Turbo Codes

    E-Print Network [OSTI]

    Sadjadpour, Hamid

    for Turbo Codes Hamid R. Sadjadpour, Senior Member, IEEE, Neil J. A. Sloane, Fellow, IEEE, Masoud Salehi, and Gabriele Nebe Abstract--The performance of a Turbo code with short block length depends critically corresponding to its parity bits. This paper describes a new interleaver design for Turbo codes with short block

  2. Interleaver Design for Turbo Codes H. R. Sadjadpour, N. J. A. Sloane, M. Salehi, and G. Nebe

    E-Print Network [OSTI]

    Sloane, Neil J. A.

    1 Interleaver Design for Turbo Codes H. R. Sadjadpour, N. J. A. Sloane, M. Salehi, and G. Nebe H DRAFT #12;2 Abstract The performance of a Turbo code with short block length depends critically corresponding to its parity bits. This paper describes a new interleaver design for Turbo codes with short block

  3. 5506 IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 55, NO. 11, NOVEMBER 2007 On the New Stopping Criteria of Iterative Turbo

    E-Print Network [OSTI]

    Hung, Shih-Hao

    Criteria of Iterative Turbo Decoding by Using Decoding Threshold Fan-Min Li and An-Yeu (Andy) Wu, Member--Decoding threshold, early termination (ET), extrinsic information transform (EXIT) chart, iterative decoding, turbo codes, turbo principle. I. INTRODUCTION IN 1993, a new class of forward-error-correction (FEC) code

  4. 1776 JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 18, NO. 12, DECEMBER 2000 BER Performance of Turbo-Coded PPM CDMA

    E-Print Network [OSTI]

    Kahn, Joseph M.

    1776 JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 18, NO. 12, DECEMBER 2000 BER Performance of Turbo Abstract--We obtain upper bounds on the bit error rate (BER) for turbo-coded optical code-division multiple noise, and multi-user interference using a Gaussian approximation. We compare the performance of turbo

  5. 1 Copyright 2009 by ASME Proceedings of ASME Turbo Expo 2009

    E-Print Network [OSTI]

    Thole, Karen A.

    1 Copyright © 2009 by ASME Proceedings of ASME Turbo Expo 2009: Power for Land, Sea, and Air GT2009,4,5] ingested. Proceedings of ASME Turbo Expo 2009: Power for Land, Sea and Air GT2009 June 8-12, 2009, Orlando, Florida, USA GT2009-60199 #12;2 Copyright © 2009 by ASME While there are many particle separation methods

  6. Dynamics of a magnetized Bianchi I universe with vacuum energy

    E-Print Network [OSTI]

    Emma J. King; Peter Coles

    2007-03-27T23:59:59.000Z

    We make use of a flat, axisymmetric Bianchi I metric to investigate the effects of a magnetic field upon the dynamics of the universe for the case in which the accompanying fluid is a cosmological constant and derive two exact solutions to the dynamical equations for this situation. We examine the behaviour of the scale factor perpendicular and parallel to the field lines, A(t) and W(t) respectively, and find the expected behaviour. The field has the strongest effect when A(t) is small, decelerating collapse perpendicular to the field lines, due to magnetic pressure, and accelerating collapse along the field lines, due to magnetic tension, while the vacuum energy dominates at late time, driving accelerated expansion.

  7. The dynamics of universe for exponential decaying dark energy

    E-Print Network [OSTI]

    Bostan, Nilay

    2015-01-01T23:59:59.000Z

    In this study we consider an exponential decaying form for dark energy as EoS parameter in order to discuss the dynamics of the universe. Firstly, assuming that universe is filled with an ideal fluid which consists of exponential decaying dark energy we obtain time dependent behavior of several physical quantities such as energy density, pressure and others for dark energy, dark energy-matter coupling and non-coupling cases. Secondly, using scalar field instead of an ideal fluid we obtain these physical quantities in terms of scalar potential and kinetic term for the same cases in scalar-tensor formalism. Finally we show that ideal fluid and scalar-tensor description of dark energy give mathematically equivalent results for this EoS parameter.

  8. Detection of renal ischemic lesions using Gd-DTPA enhanced turbo FLASH MRI: Experimental and clinical results

    SciTech Connect (OSTI)

    Vosshenrich, R.; Fischer, U.; Funke, M.; Kopka, L.; Grabbe, E. [Univ. of Goettingen (Germany)] [and others] [Univ. of Goettingen (Germany); and others

    1996-03-01T23:59:59.000Z

    Our goal was to investigate the role of Gd-DTPA-enhanced dynamic MRI in the evaluation of renal ischemic lesions. With a turbo FLASH sequence before and after injection of Gd-DTPA, nine foxhound dogs after 60-120 min of renal ischemia underwent MR examination. In addition, five patients with a tumor in a solitary kidney were examined before and after nephron-sparing renal surgery to evaluate renal perfusion and function. The experimental and clinical findings were correlated with conventional measurements of kidney function and with histological findings. Complete renal ischemia leads to a poor corticomedullary differentiation in Gd-DTPA-enhanced turbo FLASH MRI. The signal-intensity-versus-time plots of kidneys with significant postischemic changes show a less steep increase of signal intensity in the cortex and a steeper increase of signal intensity in the medulla than those of normal kidneys. Dynamic MRI demonstrate renal morphology and reflect the functional status of the renal vasculature. 21 refs., 8 figs., 1 tab.

  9. De Sitter Universe from Causal Dynamical Triangulations without Preferred Foliation

    E-Print Network [OSTI]

    S. Jordan; R. Loll

    2013-07-20T23:59:59.000Z

    We present a detailed analysis of a recently introduced version of Causal Dynamical Triangulations (CDT) that does not rely on a distinguished time slicing. Focussing on the case of 2+1 spacetime dimensions, we analyze its geometric and causal properties, present details of the numerical set-up and explain how to extract "volume profiles". Extensive Monte Carlo measurements of the system show the emergence of a de Sitter universe on large scales from the underlying quantum ensemble, similar to what was observed previously in standard CDT quantum gravity. This provides evidence that the distinguished time slicing of the latter is not an essential part of its kinematical set-up.

  10. Can Punctured Rate-1/2 Turbo Codes Achieve a Lower Error Floor than their Rate-1/3 Parent Codes?

    E-Print Network [OSTI]

    Cambridge, University of

    Can Punctured Rate-1/2 Turbo Codes Achieve a Lower Error Floor than their Rate-1/3 Parent Codes of punctured parallel concatenated convolutional codes (PCCCs), also known as punctured turbo codes, has also/3 turbo code results in better high-rate turbo codes, in terms of BEP performance, than puncturing only

  11. EU Energy Voith Turbo JV | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual Siteof Energy 2,AUDIT REPORTEnergy OffshoreDeveloper - Q &EnergieEPC Jump to:Turbo JV

  12. TurboTech Precision Engineering Private Limited | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere IRaghuraji Agro IndustriesTown of Ladoga, Indiana (UtilityTri-StateTucsonTurboTech Precision Engineering

  13. University of Maryland component of the Center for Multiscale Plasma Dynamics: Final Technical Report

    SciTech Connect (OSTI)

    Dorland, William [University of Maryland

    2014-11-18T23:59:59.000Z

    The Center for Multiscale Plasma Dynamics (CMPD) was a five-year Fusion Science Center. The University of Maryland (UMD) and UCLA were the host universities. This final technical report describes the physics results from the UMD CMPD.

  14. Pseudocodewords of Linear Programming Decoding of 3-Dimensional Turbo Codes

    E-Print Network [OSTI]

    Rosnes, Eirik; Amat, Alexandre Graell i

    2011-01-01T23:59:59.000Z

    In this work, we consider pseudocodewords of (relaxed) linear programming (LP) decoding of 3-dimensional turbo codes (3D-TCs), recently introduced by Berrou et al.. Here, we consider binary 3D-TCs while the original work of Berrou et al. considered double-binary codes. We present a relaxed LP decoder for 3D-TCs, which is an adaptation of the relaxed LP decoder for conventional turbo codes proposed by Feldman in his thesis. The vertices of this relaxed polytope are the pseudocodewords. We show that the support set of any pseudocodeword is a stopping set of iterative decoding of 3D-TCs using maximum a posteriori constituent decoders on the binary erasure channel. Furthermore, we present a numerical study of small block length 3D-TCs, which shows that typically the minimum pseudoweight (on the additive white Gaussian noise (AWGN) channel) is smaller than both the minimum distance and the stopping distance. In particular, we performed an exhaustive search over all interleaver pairs in the 3D-TC based on quadratic...

  15. Cooling system of an internal combustion engine having a turbo-charger

    SciTech Connect (OSTI)

    Hasegawa, M.; Fukuda, T.

    1986-09-02T23:59:59.000Z

    A cooling system of an internal combustion engine is described having a turbo-charger, comprising a cooling water circulation passageway filled with cooling water for cooling the engine including at least a cylinder head cooling portion, a cooling water circulation passageway for cooling the turbo-charger including a turbo-charger cooling portion, and means for supplying a part of the engine cooling water to the turbo-charger cooling water ciruclation passageway and returning it from there to the engine cooling water cirulation passageway, characterized in that the turbo-charger cooling portion is positioned at the same level or higher than the cylinder head cooling portion of the engine, the turbo-charger cooling water circulation passageway includes a water volume positioned at a level higher than the turbo-charger cooling portion. The volume is connected to a cooling water reservoir tank via a pressure relief valve which is opened when pressure in the volume exceeds a predetermined value to supply cooling water to the volume.

  16. Universal Dynamics of Kerr Frequency Comb Formation in Microresonators

    E-Print Network [OSTI]

    Herr, T; Wang, C; Hartinger, K; Gavartin, E; Holzwarth, R; Gorodetsky, M L; Kippenberg, T J

    2011-01-01T23:59:59.000Z

    Optical frequency combs allow for precise measurement of optical frequencies and are used in a growing number of applications beyond spectroscopy and optical frequency metrology. A class of compact microresonator based frequency comb generators has emerged recently based on (hyper)-parametric frequency conversion, mediated by the Kerr-non-linearity, of a continuous wave laser beam. Despite the rapid progress and the emergence of a wide variety of micro-resonator Kerr-comb platforms, an understanding of the dynamics of the Kerr comb formation is still lacking. In particular the question in which regime low phase noise performance can be achieved has so far not been answered but is of critical importance for future application of this technology. Here an universal, platform independent understanding of the Kerr-comb formation dynamics based on experimental observations in crystalline MgF2 and planar Si3N4 comb generators is given. This explains a wide range of hereto not understood phenomena and reveals for the...

  17. Dynamic Universal Accumulators for DDH Groups and Their Application to Attribute-Based Anonymous

    E-Print Network [OSTI]

    Dynamic Universal Accumulators for DDH Groups and Their Application to Attribute-Based Anonymous Report TR2009-643 April 19, 2009 Abstract We present the first dynamic universal accumulator that allows -- or has not -- been accumulated, where g generates G, to efficiently prove her knowledge of such x in zero

  18. Universal dynamics of a soliton after a quantum quench

    E-Print Network [OSTI]

    Fabio Franchini; Andrey Gromov; Manas Kulkarni; Andrea Trombettoni

    2014-08-15T23:59:59.000Z

    In a quantum quench, one prepares a system in an eigenstate of a given Hamiltonian, and then lets it evolve after suddenly changing a control parameter of the Hamiltonian. By observing this evolution, one aims at understanding whether and how a quantum system reaches a (thermal) equilibrium. Typically, the initial state is taken to be the ground state and/or in an extended state: we propose a different experimentally feasible protocol, in which the system is prepared in an excited state corresponding to a collective solitonic excitation. If we are interested only in the single particle density, in the hydrodynamic regime the time evolution can be reduced to a semi-classical non-linear differential equation. The study of such equation shows that the short time dynamics after the quench is universal, and simple analytical predictions can be given for the velocities and profiles. Numerical support for these results is presented using the the Calogero model and the non-linear Schrodinger equation (NLSE), relevant for the implementation of the proposed protocol with ultracold bosons. The effect of non-integrable terms (power-law non-linearity and a parabolic potential) in the NLSE is also investigated, and shown to not spoil the universality.

  19. Retrofit and Testing of a Pre-Turbo, Diesel Oxidation Catalyst...

    Broader source: Energy.gov (indexed) [DOE]

    Retrofit and Testing of a Pre-Turbo, Diesel Oxidation Catalyst on a Tier 0, SD60M Freight Locomotive Achieving Over 50% PM Reduction Don Newburry Research & Development Manager...

  20. Analysis of cubic permutation polynomials for turbo codes

    E-Print Network [OSTI]

    Trifina, Lucian

    2011-01-01T23:59:59.000Z

    Quadratic permutation polynomials (QPPs) have been widely studied and used as interleavers in turbo codes. However, less attention has been given to cubic permutation polynomials (CPPs). This paper proves a theorem which states sufficient and necessary conditions for a cubic permutation polynomial to be a null permutation polynomial. The result is used to reduce the search complexity of CPP interleavers for short lengths (multiples of 8, between 40 and 256), by improving the distance spectrum over the set of polynomials with the largest spreading factor. The comparison with QPP interleavers is made in terms of search complexity and upper bounds of the bit error rate (BER) and frame error rate (FER) for AWGN channel. Cubic permutation polynomials leading to better performance than quadratic permutation polynomials are found for some lengths.

  1. A Survey on Space-Time Turbo Codes

    E-Print Network [OSTI]

    Seshaiah, C V

    2010-01-01T23:59:59.000Z

    As wireless communication systems look intently to compose the transition from voice communication to interactive Internet data, achieving higher bit rates becomes both increasingly desirable and challenging. Space-time coding (STC) is a communications technique for wireless systems that inhabit multiple transmit antennas and single or multiple receive antennas. Space-time codes make use of advantage of both the spatial diversity provided by multiple antennas and the temporal diversity available with time-varying fading. Space-time codes can be divided into block codes and trellis codes. Space-time trellis coding merges signal processing at the receiver with coding techniques appropriate to multiple transmit antennas. The advantages of space-time codes (STC) make it extremely remarkable for high-rate wireless applications. Initial STC research efforts focused on narrowband flat-fading channels. The decoding complexity of Space-time turbo codes STTC increases exponentially as a function of the diversity level ...

  2. Copyright A. J. Millis 2013 Columbia University Dynamical Mean Field Theory

    E-Print Network [OSTI]

    Millis, Andrew

    Copyright A. J. Millis 2013 Columbia University Dynamical Mean Field Theory Antoine Georges http://phys.columbia.edu/~millis/MillisTLH.pdf #12;Copyright A. J. Millis 2013 Columbia University on interactions I #12;Copyright A. J. Millis 2013 Columbia University Example Second order term Hubbard model 1 2

  3. Performance characteristics of a turbo expander substituted for expansion valve on air-conditioner

    SciTech Connect (OSTI)

    Cho, Soo-Yong [Department of Mechanical and Aerospace Engineering (ReCAPT), Gyeongsang National University, 900 Gajoa-dong, Jinju 660-701 (Korea); Cho, Chong-Hyun [School of Mechanical and Aerospace Engineering, Gyeongsang National University, 900 Gajoa-dong, Jinju 660-701 (Korea); Kim, Chaesil [Department of Mechanical Engineering, Changwon National University, 9 Sarim-dong, Changwon 641-773 (Korea)

    2008-09-15T23:59:59.000Z

    An experimental study is conducted on a small turbo expander which could be applied to the expansion process in place of expansion valves in refrigerator or air-conditioner to improve the cycle efficiency by recovering energy from the throttling process. The operating gas is HFC134a and the maximum cooling capacity of experiment apparatus is 32.7 kW. Four different turbo expanders are tested to find the performance characteristics of the turbo expander when they operate at a low partial admission rate. The partial admission rate is 1.70% or 2.37, and expanders are operated in the supersonic flow. In the experiment, pressure and temperature are measured at 10 different locations in the experimental apparatus. In addition to these measurements, output power at the turbo expander is measured through a generator installed on a rotor shaft with the rotational speed. Performance data of the turbo expander are obtained at many part load operations by adjusting the output power of the generator. A maximum of 15.8% total-to-static efficiency is obtained when the pressure ratio and the partial admission ratio are 2.37 and 1.70%, respectively. Experimental results show that the optimal velocity ratio decreases when the pressure ratio is decreased, and peak efficiencies, which are obtained at locally maximized efficiency depending on the operating condition, vary linearly against the subcooling temperature or the pressure ratio. (author)

  4. Universal Science of Complexity: Consistent Understanding of Ecological, Living and Intelligent System Dynamics

    E-Print Network [OSTI]

    Andrei P. Kirilyuk

    2014-05-26T23:59:59.000Z

    A major challenge of interdisciplinary description of complex system behaviour is whether real systems of higher complexity levels can be understood with at least the same degree of objective, "scientific" rigour and universality as "simple" systems of classical, Newtonian science paradigm. The problem is reduced to that of arbitrary, many-body interaction (unsolved in standard theory). Here we review its causally complete solution, the ensuing concept of complexity and applications. The discovered key properties of dynamic multivaluedness and entanglement give rise to a qualitatively new kind of mathematical structure providing the exact version of real system behaviour. The extended mathematics of complexity contains the truly universal definition of dynamic complexity, randomness (chaoticity), classification of all possible dynamic regimes, and the unifying principle of any system dynamics and evolution, the universal symmetry of complexity. Every real system has a non-zero (and actually high) value of unreduced dynamic complexity determining, in particular, "mysterious" behaviour of quantum systems and relativistic effects causally explained now as unified manifestations of complex interaction dynamics. The observed differences between various systems are due to different regimes and levels of their unreduced dynamic complexity. We outline applications of universal concept of dynamic complexity emphasising cases of "truly complex" systems from higher complexity levels (ecological and living systems, brain operation, intelligence and consciousness, autonomic information and communication systems) and show that the urgently needed progress in social and intellectual structure of civilisation inevitably involves qualitative transition to unreduced complexity understanding (we call it "revolution of complexity").

  5. Dynamic model failure tests of dam structures Dalian University of Technology, Dalian 116024, China

    E-Print Network [OSTI]

    Spencer Jr., B.F.

    Dynamic model failure tests of dam structures Gao Lin Dalian University of Technology, Dalian failure tests of a number of concrete gravity dams, concrete arch dams and embankment dams have been index for the safety assessment of concrete dams and is predicted through dynamic model failure tests

  6. Theory of universal fast orientational dynamics in the isotropic phase of liquid crystals

    E-Print Network [OSTI]

    Fayer, Michael D.

    is also capable of examining the short distance scale and short time scale dynamics, and yields universal dynamical behavior in the isotropic phase of liquid crystals on ultrafast time scales and short distance scales. The theoretical development generates a temperature independent power law for the short

  7. RICE UNIVERSITY Early Time Ion Dynamics and Progress Towards Laser Cooling in an

    E-Print Network [OSTI]

    Killian, Thomas C.

    RICE UNIVERSITY Early Time Ion Dynamics and Progress Towards Laser Cooling in an Ultracold Neutral Dynamics and Progress Towards Laser Cooling in an Ultracold Neutral Plasma by Clayton Earl Simien The progress toward laser cooling an ultracold plasma is presented in this thesis. Ultracold neutral plasmas

  8. The Center for Control, Dynamical Systems, and Computation University of California at Santa Barbara

    E-Print Network [OSTI]

    Akhmedov, Azer

    for applications of dynamic systems modelling, and non-linear and adaptive control. Egardt is a Fellow of the IEEEThe Center for Control, Dynamical Systems, and Computation University of California at Santa (e.g. an ICE engine) and power from the buffer. This additional degree of freedom in the control

  9. The Center for Control, Dynamical Systems, and Computation University of California at Santa Barbara

    E-Print Network [OSTI]

    Akhmedov, Azer

    The Center for Control, Dynamical Systems, and Computation University of California at Santa, the system dynamics involve significant nonlinear forces as well as model uncertainty, leading to interesting and chaos. He has studied applications in electric power systems, mechanical and aerospace systems

  10. 1238 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 52, NO. 8, AUGUST 2004 An Improved Two-State Turbo-SPC Code for Wireless Communication Systems

    E-Print Network [OSTI]

    Ping, Li

    1238 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 52, NO. 8, AUGUST 2004 An Improved Two-State Turbo-SPC as special two-state turbo single-parity-check (SPC) codes [4]. For rates and nearly all code lengths, CT been devised in [5] based on Hadamard codes. The problem can also be treated using turbo-SPC codes [4

  11. HSPA+/LTE-A Turbo Decoder on GPU and Multicore CPU Michael Wu, Guohui Wang, Bei Yin, Christoph Studer, and Joseph R. Cavallaro

    E-Print Network [OSTI]

    Mellor-Crummey, John

    HSPA+/LTE-A Turbo Decoder on GPU and Multicore CPU Michael Wu, Guohui Wang, Bei Yin, Christoph implementations of re- configurable and high-throughput turbo decoders. The first implementation is optimized Bridge processor. Both implementations support max-log-MAP and log-MAP turbo decoding algorithms, various

  12. IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 52, NO. 4, APRIL 2006 1739 [11] S. N. Crozier, "New high-spread high-distance interleavers for turbo-

    E-Print Network [OSTI]

    No, Jong-Seon

    high-spread high-distance interleavers for turbo- codes," in Proc. 20th Bienn. Symp. Communications-memory inter- leaver banks for turbo-codes," in Proc.54th IEEE Vehicular Technology Conf. (VTC'01), Atlantic City, NJ, Oct. 2001, pp. 2394­2398. [13] D. Divsalar and F. Pollara, "Turbo codes for PCS applications

  13. Future EfficientDynamics with Heat Recovery

    Broader source: Energy.gov (indexed) [DOE]

    fuel injection * DI2 lean stratified * Piezo injectors * High precision injection * Turbo * Twin turbo * Variable twin turbo * Downsizing * Gearbox efficiency * Gearbox...

  14. The Center for Control, Dynamical Systems, and Computation University of California at Santa Barbara

    E-Print Network [OSTI]

    Akhmedov, Azer

    'Informazione of the University of Siena. His main research interests are in haptics, grasping and dexterous manipulation, controlThe Center for Control, Dynamical Systems, and Computation University of California at Santa point of contact with the object. This is mainly due to the complexity of the modeling and mechanical

  15. Dynamic synchronous/asynchronous replication ASSAF NATANZON,, EMC, Ben-Gurion University

    E-Print Network [OSTI]

    Bachmat, Eitan

    A Dynamic synchronous/asynchronous replication ASSAF NATANZON,, EMC, Ben-Gurion University EITAN remotely even if not all previous writes have been Author's addresses: A. Natanzon EMC Corp., Herzlia, Israel and department of Computer Science, Ben- Gurion University, Beer-Sheva, Israel, 84105. assaf.natanzon@emc

  16. Proceedings of ASME Turbo Expo 2010: Power for Land, Sea and Air June 14-18, 2010, Glasgow, UK

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Proceedings of ASME Turbo Expo 2010: Power for Land, Sea and Air GT2010 June 14-18, 2010, Glasgow by simula- tions with the PREMIX code using the detailed kinetic mecha- nism GRI-mech. 3.0. Numerical by ASME hal-00497963,version1-6Jul2010 Author manuscript, published in "ASME Turbo Expo 2010, United

  17. Proceedings of ASME TURBO EXPO 2010: Power for Land, Sea & Air June 14-18, 2010, Glasgow, GB

    E-Print Network [OSTI]

    Boyer, Edmond

    Proceedings of ASME TURBO EXPO 2010: Power for Land, Sea & Air GT2010 June 14-18, 2010, Glasgow, GB Author manuscript, published in "ASME TURBO EXPO 2010: Power for Land, Sea & Air (GT2010), Glasgow of the cavity h/b Re Rotational Reynolds number b2/ 1 Copyright c 2010 by ASME hal-00679123,version1-14Mar2012

  18. A Study on the Effectiveness of Turbo Equalization with FEC for Nonlinearity Compensation in Coherent WDM Transmissions

    E-Print Network [OSTI]

    Takafumi Fujimori; Toshiaki Koike-akino; Takashi Sugihara

    We evaluate the performance improvement in the presence of fiber nonlinearity obtained using a Turbo equalizer. Numerical simulation shows that Turbo equalization offers an improvement of 0.8 dB in a 100 Gb/s NZ-DSF transmission, even with only 5 taps for the MAP estimation. I.

  19. The Distribution of Loop Lengths in Graphical Models for Turbo Decoding

    E-Print Network [OSTI]

    Smyth, Padhraic

    1 The Distribution of Loop Lengths in Graphical Models for Turbo Decoding Xianping Ge, David ¢¡£ ¢¡ ¡ ¤¡¥ ¢¡¦ ¢¡§ ¤¡¨ © £ © ¡ © ¥ © ¦ © § © ¨ £ £ £ ¡ £ ¥ £ ¦ £ § £ ¨ ¦ £ ¡ ¦ £ ¡ £ ¡ ¥ § ¨ £ ££ £ ¡ ¥ § ¨ £ ££ Fig. 1 The ADG model for a K = 6, N = 12, rate 1/2 turbo code. Abstract-- This paper analyzes the distribution of loop lengths in graphical models for turbo decoding. The prop- erties of such loops

  20. Dynamical 3-Space: Supernovae and the Hubble Expansion - Older Universe and End of Dark Energy

    E-Print Network [OSTI]

    Reginald T Cahill

    2007-06-05T23:59:59.000Z

    We apply the new dynamics of 3-space to cosmology by deriving a Hubble expansion solution. This dynamics involves two constants; G and alpha - the fine structure constant. This solution gives an excellent parameter-free fit to the recent supernova and gamma-ray burst data without the need for `dark energy' or `dark matter'. The data and theory together imply an older age for the universe of some 14.7Gyrs. Various problems such as fine tuning, the event horizon problem etc are now resolved. A brief review discusses the origin of the 3-space dynamics and how that dynamics explained the bore hole anomaly, spiral galaxy flat rotation speeds, the masses of black holes in spherical galaxies, gravitational light bending and lensing, all without invoking `dark matter' or `dark energy'. These developments imply that a new understanding of the universe is now available.

  1. AN IMPROVED SOFT FEEDBACK V-BLAST DETECTION TECHNIQUE FOR TURBO-MIMO SYSTEMS

    E-Print Network [OSTI]

    Singer, Andrew C

    AN IMPROVED SOFT FEEDBACK V-BLAST DETECTION TECHNIQUE FOR TURBO-MIMO SYSTEMS Jun Won Choi*, Andrew-demapper) and the channel decoder exchange soft (extrinsic) information to iteratively improve system perfor- mance. Hence In this paper, an improved minimum mean square error (MMSE) soft feedback detector, called the soft input, soft

  2. Joint Turbo Equalization and Channel Estimation with Fixed-Lag Extended Kalman Filtering

    E-Print Network [OSTI]

    Wong, Tan F.

    Joint Turbo Equalization and Channel Estimation with Fixed-Lag Extended Kalman Filtering Xin Li. In the receiver, a fixed-lag Kalman equalizer jointly estimates the channel and equalizes the data symbols channel estimators employing least mean squares (LMS), recursive least squares (RLS) and Kalman filtering

  3. Frequency Domain Turbo Equalization for MIMO-CPSC Systems with Large Delay Spreads

    E-Print Network [OSTI]

    Chockalingam, A.

    Frequency Domain Turbo Equalization for MIMO-CPSC Systems with Large Delay Spreads Yogendra U characterized by large delay spreads. A low-complexity graph based equalization is carried out in the frequency domain. Because of the reduction in correlation among the noise samples that happens for large frame

  4. 1 Copyright 2011 by ASME Proceedings of ASME Turbo Expo Turbine Technical Conference

    E-Print Network [OSTI]

    Camci, Cengiz

    the melting point of blade material, efficient turbine cooling is most often required to ensure acceptable1 Copyright © 2011 by ASME Proceedings of ASME Turbo Expo Turbine Technical Conference GT2011 June TRANSFER INVESTIGATION AROUND A HIGH-PRESSURE GAS TURBINE ROTOR BLADE Ibrahim ERYILMAZ Tusas Engine

  5. Proceedings of ASME Turbo Expo 2004 2004 Power for Land, Sea, and Air

    E-Print Network [OSTI]

    Zha, Gecheng

    Proceedings of ASME Turbo Expo 2004 2004 Power for Land, Sea, and Air Vienna, Austria, June 14 incidence cascade. The second order accuracy is obtained with the dual time stepping technique. The code is reached. However, the flutter exists in much 1 Copyright c ¤ 2004 by ASME #12;wider Mach number region

  6. TurboCap: A Batteryless, Supercapacitor-based Power Supply for Mini-FDPM

    E-Print Network [OSTI]

    Shinozuka, Masanobu

    TurboCap: A Batteryless, Supercapacitor-based Power Supply for Mini-FDPM Chulsung Park1 , KeunsikCap, a batteryless, supercapacitor-based power supply subsystem for a handheld, laser-based breast cancer detector on the selection of supercapacitor topology for conversion efficiency and for form- factor minimization

  7. Separation phenomena in the tritium source and numerical simulations of turbo-molecular pumps

    E-Print Network [OSTI]

    Sharipov, Felix

    Separation phenomena in the tritium source and numerical simulations of turbo-molecular pumps Felix In the previous works [1, 2], the results of numerical calculations of tritium flow from the buffer vessel up to the first vacuum system were reported. Two values of the tritium source temperature were considered, i.e. 27

  8. INFLUENCES OF RAKE RECEIVER/TURBO DECODER PARAMETERS ON ENERGY CONSUMPTION AND QUALITY

    E-Print Network [OSTI]

    Al Hanbali, Ahmad

    INFLUENCES OF RAKE RECEIVER/TURBO DECODER PARAMETERS ON ENERGY CONSUMPTION AND QUALITY Lodewijk T are selected and their influences on the energy consumption and quality are investigated by means power hardware is needed to save energy consumption. Furthermore, an adequate quality of the wireless

  9. The Center for Control, Dynamical Systems, and Computation University of California at Santa Barbara

    E-Print Network [OSTI]

    Akhmedov, Azer

    is ubiquitous in modern technological systems. This talk discusses high performance digital control algorithmsThe Center for Control, Dynamical Systems, and Computation University of California at Santa on advanced digital control for mechatronic systems, where a magnetic bearing system developed by Professor

  10. The Center for Control, Dynamical Systems, and Computation University of California at Santa Barbara

    E-Print Network [OSTI]

    Akhmedov, Azer

    steering is introduced. It is then modified so that the automatic control system assists the driver and manufacturing applications, modelling and control of trains, maglev vehicles and automobiles. In the experimentsThe Center for Control, Dynamical Systems, and Computation University of California at Santa

  11. The Center for Control, Dynamical Systems, and Computation University of California at Santa Barbara

    E-Print Network [OSTI]

    Akhmedov, Azer

    by an example we will then explore the relationship between security and control systems. Finally we in the areas of systems, communications, control and signal processing at U.C. Berkeley. His research interestsThe Center for Control, Dynamical Systems, and Computation University of California at Santa

  12. The Center for Control, Dynamical Systems, and Computation University of California at Santa Barbara

    E-Print Network [OSTI]

    Akhmedov, Azer

    and control theory with applications to biological networks, power systems, communication networksThe Center for Control, Dynamical Systems, and Computation University of California at Santa with appropriate input-output properties as abstractions of their detailed models. The component - level task

  13. The Center for Control, Dynamical Systems, and Computation University of California at Santa Barbara

    E-Print Network [OSTI]

    Akhmedov, Azer

    regulation for a class of references and disturbances that can be generated by an internal model. HoweverThe Center for Control, Dynamical Systems, and Computation University of California at Santa Barbara Winter 2007 Seminar Series Presents Conditional Servo/Integral Action in Nonlinear Control Hassan

  14. Galaxy Dynamics: from the Early Universe to the Present ASP Conference Series, Vol. in press, 1999

    E-Print Network [OSTI]

    Saglia, Roberto P.

    Galaxy Dynamics: from the Early Universe to the Present ASP Conference Series, Vol. in press, 1999 be fitted well by a constant mass­to­light ratio (M/L) model but 7/10 require additional mass, and then fit to the measured oe and h 4 by a regularised least­squares algorithm, imposing non

  15. Draft Chapter from Mesoscale Dynamic Meteorology By Prof. Yu-lang Lin, North Carolina State University

    E-Print Network [OSTI]

    Droegemeier, Kelvin K.

    1 Draft Chapter from Mesoscale Dynamic Meteorology By Prof. Yu-lang Lin, North Carolina State University Chapter 1 Overview 1.1 Introduction The so-called mesometeorology or mesoscale meteorology as mesoscale phenomena by others (e.g. Orlanski 1975; Thunis and Bornstein 1996). Therefore, a more precise

  16. Proceedings of ASME Turbo Expo 2009: Power for Land, Sea and Air june 8-12, 2009, Orlando, Florida, USA

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Proceedings of ASME Turbo Expo 2009: Power for Land, Sea and Air GT2009 june 8-12, 2009, Orlando are constructed with another finite element mesh which 1 Copyright c 2009 by ASME hal-0068

  17. Covariant cosmological perturbation dynamics in the inflationary universe

    E-Print Network [OSTI]

    Winfried Zimdahl

    1998-06-09T23:59:59.000Z

    The linear cosmological perturbation theory of almost homogeneous and isotropic perfect fluid and scalar field universes is reconsidered and formally simplified. Using the existence of a covariant conserved quantity on large perturbation scales, a closed integral expression for comoving energy density perturbations is obtained for arbitrary equations of state. On this basis we establish a simple relation between fluid energy density perturbations at `reentry' into the horizon and the corresponding scalar field quantities at the first Hubble scale crossing during an early de Sitter phase of a standard inflationary scenario.

  18. doi:10.1155/2007/75757 Research Article Performance of JPEG Image Transmission Using Proposed Asymmetric Turbo Code

    E-Print Network [OSTI]

    K. Ramasamy; Mohammad Umar Siddiqi; Mohamad Yusoff Alias; Recommended Richard; J. Barton

    This paper gives the results of a simulation study on the performance of JPEG image transmission over AWGN and Rayleigh fading channels using typical and proposed asymmetric turbo codes for error control coding. The baseline JPEG algorithm is used to compress a QCIF (176 ×144) “Suzie ” image. The recursive systematic convolutional (RSC) encoder with generator polynomials (1, D 3 +D 2 +1/D 3 + D + 1), that is, (13/11) in decimal, and 3G interleaver are used for the typical WCDMA and CDMA2000 turbo codes. The proposed asymmetric turbo code uses generator polynomials (1, D 3 +D 2 +1/D 3 +D+1;D 3 +D 2 +1/D 3 +1),that is, (13/11; 13/9) in decimal, and a code-matched interleaver. The effect of interleaver in the proposed asymmetric turbo code is studied using weight distribution and simulation. The simulation results and performance bound for proposed asymmetric turbo code for the frame length N = 400, code rate r = 1/3 with Log-MAP decoder over AWGN channel are compared with the typical system. From the simulation results, it is observed that the image transmission using proposed asymmetric turbo code performs better than that with the typical system. Copyright © 2007 Hindawi Publishing Corporation. All rights reserved. 1.

  19. INCREASED FLEXIBILITY OF TURBO-COMPRESSORS IN NATURAL GAS TRANSMISSION THROUGH DIRECT SURGE CONTROL

    SciTech Connect (OSTI)

    Robert J. McKee

    2003-05-01T23:59:59.000Z

    This preliminary phase 1 report summarizes the background and the work on the ''Increased Flexibility of Turbo-Compressors in Natural Gas Transmission through Direct Surge Control'' project to date. The importance of centrifugal compressors for natural gas transmission is discussed, and the causes of surge and the consequences of current surge control approaches are explained. Previous technology development, including findings from early GMRC research, previous surge detection work, and selected publications, are presented. The project is divided into three Phases to accomplish the project objectives of verifying near surge sensing, developing a prototype surge control system (sensor and controller), and testing/demonstrating the benefits of direct surge control. Specification for the direct surge control sensor and controller developed with guidance from the industry Oversight Committee is presented in detail. Results of CFD modeling conducted to aid in interpreting the laboratory test results are shown and explained. An analysis of the system dynamics identified the data sampling and handling requirements for direct surge control. A detailed design process for surge detection probes has been developed and explained in this report and has been used to prepare drag probes for the laboratory compressor test and the first field test. The surge detection probes prepared for testing have been bench tested and flow tested to determine and calibrate their sensitivity to flow forces as shown in data presented in this report. The surge detection drag probes have been shown to perform as expected and as required to detect approaching surge. Laboratory test results of surge detection in the SwRI centrifugal compressor demonstrated functionality of the surge detection probes and a change in the impeller inlet flow pattern prior to surge. Although the recirculation cannot be detected because of the specific geometry of this compressor, there are changes that indicate the approach of surge that can be detected. Preparations for a field test had been completed at one point in the project. However, a failure of the surge probe wiring just inside the compressor case has caused a delay in the field testing. Repairs for the wiring in the compressor have been scheduled and the field test will take place shortly after the repairs.

  20. Further Results on Quadratic Permutation Polynomial-Based Interleavers for Turbo Codes

    E-Print Network [OSTI]

    Rosnes, Eirik

    2011-01-01T23:59:59.000Z

    An interleaver is a critical component for the channel coding performance of turbo codes. Algebraic constructions are of particular interest because they admit analytical designs and simple, practical hardware implementation. Also, the recently proposed quadratic permutation polynomial (QPP) based interleavers by Sun and Takeshita (IEEE Trans. Inf. Theory, Jan. 2005) provide excellent performance for short-to-medium block lengths, and have been selected for the 3GPP LTE standard. In this work, we derive some upper bounds on the best achievable minimum distance dmin of QPP-based conventional binary turbo codes (with tailbiting termination, or dual termination when the interleaver length N is sufficiently large) that are tight for larger block sizes. In particular, we show that the minimum distance is at most 2(2^{\

  1. EXIT-Chart Aided Near-Capacity Quantum Turbo Code Design

    E-Print Network [OSTI]

    Zunaira Babar; Soon Xin Ng; Lajos Hanzo

    2015-02-03T23:59:59.000Z

    The design of Quantum Turbo Codes (QTCs) typically relies on the analysis of their distance spectra, followed by Monte-Carlo simulations. By contrast, in this paper we appropriately adapt the conventional non-binary EXtrinsic Information Transfer (EXIT) charts for quantum turbo codes by exploiting the intrinsic quantum-to-classical isomorphism. The EXIT chart analysis not only allows us to dispense with the time-consuming Monte-Carlo simulations, but also facilitates the design of near-capacity codes without resorting to the analysis of their distance spectra. We have demonstrated that our EXIT chart predictions are in line with the Monte-Carlo simulations results. We have also optimized the entanglement-assisted QTC using EXIT charts, which outperforms the existing distance spectra based QTCs. More explicitly, the performance of our optimized QTC is as close as 0.3 dB to the corresponding hashing bound.

  2. DESIGN & DEVELOPMENT OF E-TURBO FOR SUV AND LIGHT TRUCK APPLICATIONS

    SciTech Connect (OSTI)

    Balis, C; Middlemass, C; Shahed, SM

    2003-08-24T23:59:59.000Z

    The purpose of the project is to develop an electronically controlled, electrically assisted turbocharging system, e-Turbo, for application to SUV and light truck class of passenger vehicles. Earlier simulation work had shown the benefits of e-Turbo system on increasing low-end torque and improving fuel economy. This paper will present further data from the literature to show that advanced turbocharging can enable diesel engine downsizing of 10-30% with 6-17% improvement in fuel economy. This is in addition to the fuel economy benefit that a turbocharged diesel engine offers over conventional gasoline engines. E-Turbo is necessary to get acceptable driving characteristics with downsized diesel engines. As a first step towards the development of this technology for SUV/light truck sized diesel engines (4-6 litre displacement), design concepts and hardware were evaluated for a smaller engine (2 litre displacement). It was felt that design and developments issues could be minimized, the concept proven progressively on the bench, on a small engine and then applied to a large Vee engine (one on each bank). After successful demonstration of the concept, large turbomachinery could be designed and built specifically for larger SUV sized diesel engines. This paper presents the results of development of e-Turbo for a 2 litre diesel engine. A detailed comparison of several electric assist technologies including permanent magnet, six-phase induction and conventional induction motor/generator technology was done. A comparison of switched reluctance motor technology was also done although detailed design was not carried out.

  3. The University of Michigan Structural Dynamics Laboratory McGill University Faculty of Engineering

    E-Print Network [OSTI]

    Barthelat, Francois

    ? · Greenhouse gas production ­ a contribution to global warming RENEWABLE and ALTERNATIVE ENERGY: Adding Professor and Canada Research Chair Department of Electrical and Computer Engineering December 5, 2007 #12;McGill University Faculty of Engineering Faculty of Engineering Total world energy and electricity

  4. Dynamic universality for Z sub 2 and Z sub 3 lattice gauge theories at finite temperature

    SciTech Connect (OSTI)

    Brower, R.C. (Physics Department and Department of Electrical, Computer and Systems Engineering, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215 (United States)); Huang, S. (Physics Department, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215 (United States) Department of Physics, FM-15, University of Washington, Seattle, Washington 98195 (United States))

    1991-12-15T23:59:59.000Z

    Swendsen-Wang random surface dynamics for {ital Z}{sub 2} and {ital Z}{sub 3} gauge theories in 2+1 dimensions is applied to the finite-temperature deconfining transition, and the static universality conjecture of Svetitsky and Yaffe is extended to the exponent {ital z} for critical dynamics. Our new dynamic universality conjecture ({ital z}{sub RS}{sup {ital d}+1}={ital z}{sub SW}{sup {ital d}}) is supported both by a qualitative argument and by numerical simulations that show that the dynamic critical exponents for (2+1)-dimensional gauge theories (logarithmic or {ital z}{sub RS}{lt}0.3{plus minus}0.1 and 0.53{plus minus}0.03 for {ital Z}{sub 2} and {ital Z}{sub 3}, respectively) are consistent with the values for the two-dimensional Ising-Potts models (logarithmic or {ital z}{sub SW}=0.20--0.27 and 0.55{plus minus}0.03 for {ital Z}{sub 2} and {ital Z}{sub 3}, respectively) at the finite-temperature transition.

  5. Universal self-similar dynamics of relativistic and nonrelativistic field theories near nonthermal fixed points

    E-Print Network [OSTI]

    Orioli, A Pineiro; Berges, J

    2015-01-01T23:59:59.000Z

    We investigate universal behavior of isolated many-body systems far from equilibrium, which is relevant for a wide range of applications from ultracold quantum gases to high-energy particle physics. The universality is based on the existence of nonthermal fixed points, which represent nonequilibrium attractor solutions with self-similar scaling behavior. The corresponding dynamic universality classes turn out to be remarkably large, encompassing both relativistic as well as nonrelativistic quantum and classical systems. For the examples of nonrelativistic (Gross-Pitaevskii) and relativistic scalar field theory with quartic self-interactions, we demonstrate that infrared scaling exponents as well as scaling functions agree. We perform two independent nonperturbative calculations, first by using classical-statistical lattice simulation techniques and second by applying a vertex-resummed kinetic theory. The latter extends kinetic descriptions to the nonperturbative regime of overoccupied modes. Our results open ...

  6. 1 Copyright 2004 by ASME Proceedings of ASME Turbo Expo 2004

    E-Print Network [OSTI]

    Müller, Norbert

    in one dynamic process. The underlying phenomena of flash evaporation, shock wave compression on a thermodynamic model was generated to evaluate the performance of R718 baseline and wave-rotor-enhanced cycles-PORT CONDENSING WAVE ROTOR Amir A. Kharazi Michigan State University Dept. of Mechanical Engineering

  7. Joint Turbo Channel Detection and RLL Decoding for (1, 7) Coded Partial Response Recording Channels Zhao Fang IBM Global Services

    E-Print Network [OSTI]

    George Mathew; B. Farhang-boroujeny

    Abstract — Runlength limited (RLL) codes are essential in recording systems for minimizing distortions and maintaining bit synchronization. In this paper, we investigate the application of turbo codes on RLL (1, 7) coded partial response equalized recording channels. We propose a ‘combined trellis ’ approach for doing ‘soft-in soft-out ’ (SISO) channel detection and RLL decoding jointly. This approach makes the implementation of turbo equalization easier since it eliminates the need for a ‘SISO RLL encoder ’ in the feedback path from turbo decoder to channel detector. Simulation studies on magnetic recording channels show that our approach provides a coding gain of about 4 dB compared to Viterbi detection at 10 ?6 bit error rate. I.

  8. 1D-8 Duo-Binary Circular Turbo Decoder Based on Border Metric Encoding for WiMAX

    E-Print Network [OSTI]

    Ji-hoon Kim; In-cheol Park

    Abstract- This paper presents a duo-binary circular turbo decoder based on border metric encoding. With the proposed method, the memory size for branch memory is reduced by half and the dummy calculation is removed at the cost of the small-sized memory which holds the encoded border metrics. Based on the proposed SISO decoder and the dedicated hardware interleaver, a duo-binary circular turbo decoder is designed for the WiMAX standard using a 0.13 ?m CMOS process, which can support 24.26 Mbps at 200MHz. I.

  9. Ber analysis of iterative turbo encoded miso wireless communication system under implementation of q-ostbc scheme

    E-Print Network [OSTI]

    Kabir, M Hasnat; Zaman, Mustari; Rashed, Md Golam

    2012-01-01T23:59:59.000Z

    In this paper, a comprehensive study has been made to evaluate the performance of a MISO wireless communication system. The 4-by-1 spatially multiplexed Turbo encoded system under investigation incorporates Quasi-orthogonal space-time block coding (Q-STBC) and ML signal detection schemes under QPSK, QAM, 16PSK and 16QAM digital modulations. The simulation results elucidate that a significant improvement of system performance is achieved in QAM modulation. The results are also indicative of noticeable system performance enhancement with increasing number of iterations in Turbo encoding/decoding scheme.

  10. Phase space dynamics of triaxial collapse: II. Universal evolution of axis ratios

    E-Print Network [OSTI]

    Nadkarni-Ghosh, Sharvari

    2015-01-01T23:59:59.000Z

    In paper I of this series, we examined triaxial collapse in terms of the dynamics of eigenvalues of three important tensors: the Hessian of the gravitational potential, the tensor of velocity derivatives and the deformation tensor. The first paper focussed on the joint gravity-velocity dynamics and here we focus on the deformation tensor, which is directly related to the axes' evolution. We examine the evolution of the minor to major and intermediate to major axes ratios ($s$ and $q$) and the triaxiality parameter $T$ as function of mass scale and redshift. We find that the ellipticity and prolateness increase with decreasing mass scale and decreasing redshift. These trends, while in agreement with previous analytic studies, contradict numerical simulations. Nevertheless, we find that a suitable transformation of $s$, motivated by the scaling used in recent analysis of the Millennium XXL simulations by Bonamigo {\\it et al} (2014), has a universal log-normal distribution function that matches their numerical r...

  11. A serially concatenated BCH-Turbo code scheme over an Additive White Gaussion Noise channel

    E-Print Network [OSTI]

    Ovalekar, Sameer V.

    1997-01-01T23:59:59.000Z

    ', ?. ) (3-1) where wr. is the weight of the k'" data word. If all the cocle-words are considered, using union bounding techniques rve get, Ps = Ps(choose any k E (I, 2, 3. . . . 2'v ? 1) ~0) (2a ? li Ps(k 0) = Z ?, . 'a(+) (3. 2) whme all non... " (Head of Department) December 1997 Major Subject: Electrical Fngineering 111 ABSTRACT A Serially Concatenated BCH-Turbo Code Scheme over an Additive White Gaussian Noise Channel. (December 1997) Sameer V. Ovalekar, I3. E. , Hniversity of Bombay...

  12. Turbo Compounding: A Technology Whose Time Has Come | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    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 DataDepartment of Energy Your Density Isn'tOriginEducationVideoStrategic|IndustrialCenterMarch 4; RSVP byof Energy Turbines in U.S.Turbo

  13. Two-Stroke Uniflow Turbo-Compound IC Engine | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    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 DataDepartment of Energy Your Density Isn'tOriginEducationVideoStrategic|IndustrialCenterMarch 4; RSVP byofUniflow Turbo-Compound IC Engine

  14. Generalized models as a universal approach to the analysis of nonlinear dynamical systems

    E-Print Network [OSTI]

    Thilo Gross; Ulrike Feudel

    2006-01-29T23:59:59.000Z

    We present a universal approach to the investigation of the dynamics in generalized models. In these models the processes that are taken into account are not restricted to specific functional forms. Therefore a single generalized models can describe a class of systems which share a similar structure. Despite this generality, the proposed approach allows us to study the dynamical properties of generalized models efficiently in the framework of local bifurcation theory. The approach is based on a normalization procedure that is used to identify natural parameters of the system. The Jacobian in a steady state is then derived as a function of these parameters. The analytical computation of local bifurcations using computer algebra reveals conditions for the local asymptotic stability of steady states and provides certain insights on the global dynamics of the system. The proposed approach yields a close connection between modelling and nonlinear dynamics. We illustrate the investigation of generalized models by considering examples from three different disciplines of science: a socio-economic model of dynastic cycles in china, a model for a coupled laser system and a general ecological food web.

  15. Screening masses in quenched (2+1)d Yang-Mills theory: universality from dynamics?

    E-Print Network [OSTI]

    Rafael B. Frigori

    2010-02-25T23:59:59.000Z

    We compute the spectrum of gluonic screening-masses in the $0^{++}$ channel of quenched 3d Yang-Mills theory near the phase-transition. Our finite-temperature lattice simulations are performed at scaling region, using state-of-art techniques for thermalization and spectroscopy, which allows for thorough data extrapolations to thermodynamic limit. Ratios among mass-excitations with the same quantum numbers on the gauge theory, 2d Ising and $\\lambda\\phi^{4}$ models are compared, resulting in a nice agreement with predictions from universality. In addition, a gauge-to-scalar mapping, previously employed to fit QCD Green's functions at deep IR, is verified to dynamically describe these universal spectroscopic patterns

  16. The viscosity radius in dilute polymer solutions: Universal behaviour from DNA rheology and Brownian dynamics simulations

    E-Print Network [OSTI]

    Sharadwata Pan; D. Ahirwal; Duc At Nguyen; T. Sridhar; P. Sunthar; J. Ravi Prakash

    2014-10-14T23:59:59.000Z

    The swelling of the viscosity radius, $\\alpha_\\eta$, and the universal viscosity ratio, $U_{\\eta R}$, have been determined experimentally for linear DNA molecules in dilute solutions with excess salt, and numerically by Brownian dynamics simulations, as a function of the solvent quality. In the latter instance, asymptotic parameter free predictions have been obtained by extrapolating simulation data for finite chains to the long chain limit. Experiments and simulations show a universal crossover for $\\alpha_\\eta$ and $U_{\\eta R}$ from $\\theta$ to good solvents in line with earlier observations on synthetic polymer-solvent systems. The significant difference between the swelling of the dynamic viscosity radius from the observed swelling of the static radius of gyration, is shown to arise from the presence of hydrodynamic interactions in the non-draining limit. Simulated values of $\\alpha_\\eta$ and $U_{\\eta R}$ are in good agreement with experimental measurements in synthetic polymer solutions reported previously, and with the measurements in linear DNA solutions reported here.

  17. Turbo Codes Based on Time-Variant Memory-1 Convolutional Codes over Fq

    E-Print Network [OSTI]

    Liva, Gianluigi; Scalise, Sandro; Chiani, Marco

    2011-01-01T23:59:59.000Z

    Two classes of turbo codes over high-order finite fields are introduced. The codes are derived from a particular protograph sub-ensemble of the (dv=2,dc=3) low-density parity-check code ensemble. A first construction is derived as a parallel concatenation of two non-binary, time-variant accumulators. The second construction is based on the serial concatenation of a non-binary, time-variant differentiator and of a non-binary, time-variant accumulator, and provides a highly-structured flexible encoding scheme for (dv=2,dc=4) ensemble codes. A cycle graph representation is provided. The proposed codes can be decoded efficiently either as low-density parity-check codes (via belief propagation decoding over the codes bipartite graph) or as turbo codes (via the forward-backward algorithm applied to the component codes trellis). The forward-backward algorithm for symbol maximum a posteriori decoding of the component codes is illustrated and simplified by means of the fast Fourier transform. The proposed codes provid...

  18. A NOVEL APPROACH FOR LOWER POWER DESIGN IN TURBO CODING SYSTEM

    E-Print Network [OSTI]

    Dr. K. Sathaya Prasad

    Abstract: Low Power is an extremely important issue for future mobile communication systems; The focus of this paper is to implementat turbo codes for low power solutions. The effect on performance due to variation in parameters like frame length, number of iterations, type of encoding scheme and type of the interleave in the presence of additive white Gaussian noise is studied with the floating point model. In order to obtain the effect of quantization and word length variation, a fixed point model of the application is also developed.. The application performance measure, namely bit-error rate (BER) is used as a design constraint while optimizing for power and area coverage. Low power Optimization is Performed on Implementation levels by the use of Voltage scaling. With those Techniques we can reduced the power 98.5%and Area(LUT) is 57 % and speed grade is Increased.This type of Power maneger is proposed and implemented based on the timing details of the turbo decoder in the VHDL model.

  19. Proceedings of ASME Turbo Expo 2014: Turbine Technical Conference and Exposition June 16-20, 2014, Dusseldorf, Germany

    E-Print Network [OSTI]

    Boyer, Edmond

    Proceedings of ASME Turbo Expo 2014: Turbine Technical Conference and Exposition GT2014 June 16 Bordes, France moustapha.mbaye@turbomeca.fr ABSTRACT The recent improvements in turbomachinery design into consideration when dealing with turbomachinery bladed disks. The predictive com- putational models are more

  20. Modeling the effects of maintenance on the degradation of a water-feeding turbo-pump of nuclear power plant

    E-Print Network [OSTI]

    Boyer, Edmond

    of the components, which derives from the particular `life' (failures, shocks, preventive maintenance actionsModeling the effects of maintenance on the degradation of a water-feeding turbo-pump of nuclear Abstract: This work addresses the modeling of the effects of maintenance on the degradation of an electric

  1. 1 Copyright 20xx by ASME Proceedings of the ASME Turbo Expo 2009: Power for Land, Sea and Air

    E-Print Network [OSTI]

    Dabiri, John O.

    1 Copyright © 20xx by ASME Proceedings of the ASME Turbo Expo 2009: Power for Land, Sea and Air on a simple 8th power velocity scaling law for jet noise generation. Thus, highly effective subsonic jet noise and author of correspondence #12;2 Copyright © 20xx by ASME the same mechanisms for which these devices have

  2. Proceedings of ASME Turbo Expo 2010: Power for Land, Sea and Air June 14-18, 2010, Glasgow, UK

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Proceedings of ASME Turbo Expo 2010: Power for Land, Sea and Air GT2010 June 14-18, 2010, Glasgow by sweeping the forcing frequency. It is then possible to conduct 1 Copyright c 2010 by ASME hal-00825511,version1-23May2013 Author manuscript, published in "Journal of Engineering for Gas Turbines and Power 133

  3. Use of Xenon Difluoride to Clean Hazardous By-Products in Ion Implanter Source Housings, Turbo Pumps, and Fore-Lines

    SciTech Connect (OSTI)

    Despres, J.; Chambers, B.; Bishop, S.; Kaim, R.; Letaj, S.; Sergi, S.; Sweeney, J.; Tang, Y.; Wilson, S.; Yedave, S. [ATMI, 7 Commerce Drive, Danbury, CT, 06810 (United States)

    2011-01-07T23:59:59.000Z

    This paper describes the use of xenon difluoride to clean deposits in the source housing, source turbo pump, and source turbo pump fore-line of ion implanters. Xenon difluoride has previously been shown to be effective in increasing the lifetime of the ion source{sup 1,2} and this paper presents an extension of the technology to other areas within the tool. Process by-products that are deposited in the source housing, turbo pump, and turbo pump fore-line can not only pose productivity issues, in the case of coatings on insulators, but can also be flammable and toxic in the case of deposits formed within the turbo pump and fore-line. The results presented in this paper detail the initial successful examples of using xenon difluoride to clean these deposits.ATMI has shown that xenon difluoride is capable of cleaning an insulator in an ion implanter. Typically during use an insulator will become increasingly coated with deposits that could lead to productivity problems. By introducing xenon difluoride into the source housing the insulator residues were effectively cleaned in-situ, thereby extending the maintenance interval and resulting in significant consumable savings.Similar deposits that form in the turbo pump and fore-line could not only lead to production problems due to turbo pump failure or fore-line build-up, but pose significant health risks during the ex-situ cleaning process. Through internal testing ATMI has shown that xenon difluoride is able to clean phosphorus and germanium deposits located within a turbo pump. Additionally, testing has demonstrated that the turbo pump fore-line can be cleaned in-situ without the need to remove these components, thereby virtually eliminating the possibility of fires. The cleaning reaction progress and by-products were monitored using FTIR spectrometry and thermocouples.In order to efficiently clean the source housing, turbo pump, and turbo pump fore-line xenon difluoride delivery must be optimized. This paper also details a hardware concept that maximizes xenon difluoride delivery and allows the clean to be done in a way that is viable for production ion implanters.

  4. 13th Winter Workshop on Nuclear Dynamics W.J. Llope Marathon Key, Florida, February 18, 1997 Rice University

    E-Print Network [OSTI]

    Llope, William J.

    test . Completed Spring, 1999 Nuclear matter under extreme conditions... Search for, and studies of, February 1­8, 1997 Rice University TPC . 24+2 outer, and 24+2 inner, sectors built & tested . gas vessel13th Winter Workshop on Nuclear Dynamics W.J. Llope Marathon Key, Florida, February 1­8, 1997 Rice

  5. Evidence of universality in the dynamical response of nanomechanical ultra-nanocrystalline diamond resonators at millikelvin temperatures

    E-Print Network [OSTI]

    independent theory. In particular, polycrystalline diamond is an exciting material for nanomechanical devicesEvidence of universality in the dynamical response of nanomechanical ultra-nanocrystalline diamond fabricated from ultra-nanocrystalline diamond. Frequency shift f/f0 and dissipa- tion Q-1 demonstrate

  6. International Journal of Electrical and Computer Engineering 3:10 2008 Optimal Power Allocation for the Proposed Asymmetric Turbo Code for 3G Systems

    E-Print Network [OSTI]

    K. Ramasamy; B. Balamuralithara; Mohammad Umar Siddiqi

    Abstract—We proposed a new class of asymmetric turbo encoder for 3G systems that performs well in both “water fall ” and “error floor ” regions in [7]. In this paper, a modified (optimal) power allocation scheme for the different bits of new class of asymmetric turbo encoder has been investigated to enhance the performance. The simulation results and performance bound for proposed asymmetric turbo code with modified Unequal Power Allocation (UPA) scheme for the frame length, N=400, code rate, r=1/3 with Log-MAP decoder over Additive White Gaussian Noise (AWGN) channel are obtained and compared with the system with typical UPA and without UPA. The performance tests are extended over AWGN channel for different frame size to verify the possibility of implementation of the modified UPA scheme for the proposed asymmetric turbo code. From the performance results, it is observed that the proposed asymmetric turbo code with modified UPA performs better than the system without UPA and with typical UPA and it provides a coding gain of 0.4 to 0.52dB. Keywords—Asymmetric turbo code, Generator polynomial, Interleaver, UPA, WCDMA, cdma2000. I.

  7. Dynamical vacuum energy in the expanding Universe confronted with observations: a dedicated study

    E-Print Network [OSTI]

    Adria Gomez-Valent; Joan Sola; Spyros Basilakos

    2014-11-27T23:59:59.000Z

    Despite the many efforts, our theoretical understanding of the ultimate nature of the dark energy component of the universe still lags well behind the astounding experimental evidence achieved from the increasingly sophisticated observational tools at our disposal. While the canonical possibility is a strict cosmological constant, or rigid vacuum energy density $\\rho_{\\Lambda}=$const., the exceeding simplicity of this possibility lies also at the root of its unconvincing theoretical status, as there is no explanation for the existence of such constant for the entire cosmic history. Herein we explore general models of the vacuum energy density slowly evolving with the Hubble function $H$ and/or its time derivative, $\\rho_{\\Lambda}(H,\\dot{H})$. Some of these models are actually well-motivated from the theoretical point of view and may provide a rich phenomenology that could be explored in future observations, whereas some others have more limitations. In this work, we put them to the test and elucidate which ones are still compatible with the present observations and which ones are already ruled out. We consider their implications on structure formation, in combination with data on type Ia supernovae, the Cosmic Microwave Background, the Baryonic Acoustic Oscillations, and the predicted redshift distribution of cluster-size collapsed structures. The relation of these vacuum models on possible evidence of dynamical dark energy recently pointed out in the literature is also briefly addressed.

  8. Balance of Plant System Analysis and Component Design of Turbo-Machinery for High Temperature Gas Reactor Systems

    SciTech Connect (OSTI)

    Ronald G. Ballinger Chunyun Wang Andrew Kadak Neil Todreas

    2004-08-30T23:59:59.000Z

    The Modular Pebble Bed Reactor system (MPBR) requires a gas turbine cycle (Brayton cycle) as the power conversion system for it to achieve economic competitiveness as a Generation IV nuclear system. The availability of controllable helium turbomachinery and compact heat exchangers are thus the critical enabling technology for the gas turbine cycle. The development of an initial reference design for an indirect helium cycle has been accomplished with the overriding constraint that this design could be built with existing technology and complies with all current codes and standards. Using the initial reference design, limiting features were identified. Finally, an optimized reference design was developed by identifying key advances in the technology that could reasonably be expected to be achieved with limited R&D. This final reference design is an indirect, intercooled and recuperated cycle consisting of a three-shaft arrangement for the turbomachinery system. A critical part of the design process involved the interaction between individual component design and overall plant performance. The helium cycle overall efficiency is significantly influenced by performance of individual components. Changes in the design of one component, a turbine for example, often required changes in other components. To allow for the optimization of the overall design with these interdependencies, a detailed steady state and transient control model was developed. The use of the steady state and transient models as a part of an iterative design process represents a key contribution of this work. A dynamic model, MPBRSim, has been developed. The model integrates the reactor core and the power conversion system simultaneously. Physical parameters such as the heat exchangers; weights and practical performance maps such as the turbine characteristics and compressor characteristics are incorporated into the model. The individual component models as well as the fully integrated model of the power conversion system have been verified with an industry-standard general thermal-fluid code Flownet. With respect to the dynamic model, bypass valve control and inventory control have been used as the primary control methods for the power conversion system. By performing simulation using the dynamic model with the designed control scheme, the combination of bypass and inventory control was optimized to assure system stability within design temperature and pressure limits. Bypass control allows for rapid control system response while inventory control allows for ultimate steady state operation at part power very near the optimum operating point for the system. Load transients simulations show that the indirect, three-shaft arrangement gas turbine power conversion system is stable and controllable. For the indirect cycle the intermediate heat exchanger (IHX) is the interface between the reactor and the turbomachinery systems. As a part of the design effort the IHX was identified as the key component in the system. Two technologies, printed circuit and compact plate-fin, were investigated that have the promise of meeting the design requirements for the system. The reference design incorporates the possibility of using either technology although the compact plate-fin design was chosen for subsequent analysis. The thermal design and parametric analysis with an IHX and recuperator using the plate-fin configuration have been performed. As a three-shaft arrangement, the turbo-shaft sets consist of a pair of turbine/compressor sets (high pressure and low pressure turbines with same-shaft compressor) and a power turbine coupled with a synchronous generator. The turbines and compressors are all axial type and the shaft configuration is horizontal. The core outlet/inlet temperatures are 900/520 C, and the optimum pressure ratio in the power conversion cycle is 2.9. The design achieves a plant net efficiency of approximately 48%.

  9. Measurement and control system for cryogenic helium gas bearing turbo-expander experimental platform based on Siemens PLC S7-300

    SciTech Connect (OSTI)

    Li, J.; Xiong, L. Y.; Peng, N.; Dong, B.; Liu, L. Q. [Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190 (China); Wang, P. [Beijing Sciample Technology Co., Ltd., Beijing, 100190 (China)

    2014-01-29T23:59:59.000Z

    An experimental platform for cryogenic Helium gas bearing turbo-expanders is established at the Technical Institute of Physics and Chemistry, Chinese Academy of Sciences. This turbo-expander experimental platform is designed for performance testing and experimental research on Helium turbo-expanders with different sizes from the liquid hydrogen temperature to the room temperature region. A measurement and control system based on Siemens PLC S7-300 for this turbo-expander experimental platform is developed. Proper sensors are selected to measure such parameters as temperature, pressure, rotation speed and air flow rate. All the collected data to be processed are transformed and transmitted to S7-300 CPU. Siemens S7-300 series PLC CPU315-2PN/DP is as master station and two sets of ET200M DP remote expand I/O is as slave station. Profibus-DP field communication is established between master station and slave stations. The upper computer Human Machine Interface (HMI) is compiled using Siemens configuration software WinCC V6.2. The upper computer communicates with PLC by means of industrial Ethernet. Centralized monitoring and distributed control is achieved. Experimental results show that this measurement and control system has fulfilled the test requirement for the turbo-expander experimental platform.

  10. UNIVERSITY OF CALIFORNIA, SAN DIEGO Dynamic Workload Characterization for Energy Efficient Computing

    E-Print Network [OSTI]

    Simunic, Tajana

    . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.2 Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.2.1 System Model . . . . . . . . . . . . . . . . . . . . . . . . . 48 3.2 DVFS for System Level Energy Savings . . . . . . . . . . 49 3.3 Evaluation Setup and Results . . . . . . . . . . . . . . . 2 1.1.1 Dynamic Power Management . . . . . . . . . . . 3 1.1.2 Dynamic Voltage Frequency Scaling

  11. Horizon Dynamics of Evaporating Black Holes in a Higher Dimensional Inflationary Universe

    E-Print Network [OSTI]

    Manasse Mbonye

    1999-08-19T23:59:59.000Z

    Spherically symmetric Black Holes of the Vaidya type are examined in an asymptotically de Sitter, higher dimensional spacetime. The various horizons are located. The structure and dynamics of such horizons are studied.

  12. Universal pensions in Mexico City : changing dynamics of citizenship and state formation in a global city

    E-Print Network [OSTI]

    Lajous-Loaeza, Andrés

    2009-01-01T23:59:59.000Z

    The main topic of this study is the enactment of a non-contributory and non-means-tested Universal Pension (Pension Alimentaria Ciudadana para Adultos Mayores) program in Mexico City directed at city residents 70 years of ...

  13. Influence of the dynamical mass generation for light scalar fields in inflationary universe

    E-Print Network [OSTI]

    Arai, Takashi

    2012-01-01T23:59:59.000Z

    The infrared effects for light (including massless) minimally coupled scalar fields with quartic self-interaction in de Sitter space is investigated by the 2PI effective action formalism. This formalism partly resums the infinite series of loop diagrams. Due to nonperturbative infrared effects the scalar field acquires the dynamically generated mass in de Sitter space. In this paper, we analyze the physical influence of this dynamical mass generation. Because of its nonperturbative nature, one needs infinite series of divergent terms as counterterms for consistent renormalization of the effective action. The phase structure and the quantum backreaction to the Einstein's field equation are calculated.

  14. Dynamic Spherical Volumetric Simplex Splines with Applications in Biomedicine Wayne State University

    E-Print Network [OSTI]

    Qin, Hong

    Dynamic Spherical Volumetric Simplex Splines with Applications in Biomedicine Yunhao Tan , Jing Hua computational framework based on dy- namic spherical volumetric simplex splines for simulation of genus- zero to reconstruct the high-fidelity digi- tal model of a real-world object with spherical volumetric simplex splines

  15. Selection of Nonequilibrium Overlimiting Currents: Universal Depletion Layer Formation Dynamics and Vortex Instability

    E-Print Network [OSTI]

    Chang, Hsueh-Chia

    and important I-V characteristic of conduct- ing ion-selective membranes, such as Nafion membranes in fuel cells Engineering, Center for Microfluidics and Medical Diagnostics, University of Notre Dame, Notre Dame, Indiana, cell membranes with ion channels, and desali- nation membranes, is that, at sufficiently high voltages

  16. The Center for Control, Dynamical Systems, and Computation University of California at Santa Barbara

    E-Print Network [OSTI]

    Akhmedov, Azer

    to an Oil Well Drilling System Ole Morten Aamo Norwegian University of Science and Technology (NTNU) Friday, September 25, 2009 3:00 - 4:00 PM HFH 1104 Abstract: A new adaptive observer (re)design is developed. The design was originally motivated by the pressure estimation problem in an oil well drilling system

  17. Dynamic

    Office of Legacy Management (LM)

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn AprilA group currentBradleyTableSelling7111AWell: Gas productionDynamic , and Static ,

  18. Investigating potential light-duty efficiency improvements through simulation of turbo-compounding and waste-heat recovery systems

    SciTech Connect (OSTI)

    Edwards, Kevin Dean [ORNL; Wagner, Robert M [ORNL; Briggs, Thomas E [ORNL

    2010-01-01T23:59:59.000Z

    Modern diesel engines used in light-duty transportation applications have peak brake thermal efficiencies in the range of 40-42% for high-load operation with substantially lower efficiencies at realistic road-load conditions. Thermodynamic energy and exergy analysis reveals that the largest losses from these engines are due to combustion irreversibility and heat loss to the coolant, through the exhaust, and by direct convection and radiation to the environment. Substantial improvement in overall engine efficiency requires reducing or recovering these losses. Unfortunately, much of the heat transfer either occurs at relatively low temperatures resulting in large entropy generation (such as in the air-charge cooler), is transferred to low-exergy flow streams (such as the oil and engine coolant), or is radiated or convected directly to the environment. While there are significant opportunities for recovery from the exhaust and EGR cooler for heavy-duty applications, achieving similar benefits for light-duty applications is complicated by transient, low-load operation at typical driving conditions and competition with the turbocharger and aftertreatment system for the limited thermal resources. We have developed an organic Rankine cycle model using GT-Suite to investigate the potential for efficiency improvement through waste-heat recovery from the exhaust and EGR cooler of a light-duty diesel engine. The model is used to examine the effects of efficiency-improvement strategies such as cylinder deactivation, use of advanced materials and improved insulation to limit ambient heat loss, and turbo-compounding on the steady-state performance of the ORC system and the availability of thermal energy for downstream aftertreatment systems. Results from transient drive-cycle simulations are also presented, and we discuss strategies to address operational difficulties associated with transient drive cycles and balancing the thermal requirements of waste-heat recovery, turbocharging or turbo-compounding, and exhaust aftertreatment.

  19. Dynamical interactions and the black-hole merger rate of the Universe

    SciTech Connect (OSTI)

    O'Leary, Ryan M.; O'Shaughnessy, Richard; Rasio, Frederic A. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States); Northwestern University, Department of Physics and Astronomy, 2132 Tech Drive, Evanston, Illinois 60208 (United States)

    2007-09-15T23:59:59.000Z

    Binary black holes can form efficiently in dense young stellar clusters, such as the progenitors of globular clusters, via a combination of gravitational segregation and cluster evaporation. We use simple analytic arguments supported by detailed N-body simulations to determine how frequently black holes born in a single stellar cluster should form binaries, be ejected from the cluster, and merge through the emission of gravitational radiation. We then convolve this 'transfer function' relating cluster formation to black-hole mergers with (i) the distribution of observed cluster masses and (ii) the star formation history of the Universe, assuming that a significant fraction g{sub cl} of star formation occurs in clusters and that a significant fraction g{sub evap} of clusters undergo this segregation and evaporation process. We predict future ground-based gravitational wave detectors could observe {approx}500(g{sub cl}/0.5)(g{sub evap}/0.1) double black-hole mergers per year, and the presently operating LIGO interferometer would have a chance (50%) at detecting a merger during its first full year of science data. More realistically, advanced LIGO and similar next-generation gravitational wave observatories provide unique opportunities to constrain otherwise inaccessible properties of clusters formed in the early Universe.

  20. The One University digital initiative embraces digital technologies to create an even more dynamic OU experience. It promotes dynamic learning experiences, enhances services to

    E-Print Network [OSTI]

    Oklahoma, University of

    initiative. A collaboration between Information Technology, Web Communications, and University Libraries, One" digital interactive word wall--a feature intended to highlight the ways One University is using technology campus technology retailer. An Apple Authorized Campus Store, One University will sell a wide range

  1. Instrumentation and Beam Dynamics Study of Advanced Electron-Photon Facility in Indiana University

    SciTech Connect (OSTI)

    Luo, Tianhuan; /Indiana U.

    2011-08-01T23:59:59.000Z

    The Advanced eLectron-PHoton fAcility (ALPHA) is a compact electron accelerator under construction and being commissioned at the Indiana University Center for Exploration of Energy and Matter (CEEM). In this thesis, we have studied the refurbished Cooler Injector Synchrotron (CIS) RF cavity using both the transmission line model and SUPERFISH simulation. Both low power and high power RF measurements have been carried out to characterize the cavity. Considering the performance limit of ferrite, we have designed a new ferrite loaded, co-axial quarter wave like cavity with similar structure but a more suitable ferrite material. We have also designed a traveling wave stripline kicker for fast extraction by POISSON and Microwave Studio. The strips geometry is trimmed to maximize the uniformity of the kicking field and match the impedance of the power cables. The time response simulation shows the kicker is fast enough for machine operation. The pulsed power supply requirement has also been specified. For the beam diagnosis in the longitudinal direction, we use a wideband Wall Gap Monitor (WGM) served in CIS. With proper shielding and amplification to get good WGM signal, we have characterized the injected and extracted beam signal in single pass commissioning, and also verified the debunching effect of the ALPHA storage ring. A modulation-demodulation signal processing method is developed to measure the current and longitudinal profile of injected beam. By scanning the dipole strength in the injection line, we have reconstructed the tomography of the longitudinal phase space of the LINAC beam. In the accumulation mode, ALPHA will be operated under a low energy and high current condition, where intra beam scattering (IBS) becomes a dominant effect on the beam emittance. A self consistent simulation, including IBS effect, gas scattering and linear coupling, has been carried out to calculate the emittance of the stored beam.

  2. Dynamics of Johari-Goldstein ? relaxation and its universal relation to ? relaxation in bulk metallic glasses by mechanical spectroscopy

    SciTech Connect (OSTI)

    Wu, Xuebang, E-mail: xbwu@issp.ac.cn; Guo, Lijun; Liu, C. S. [Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei, Anhui (China)

    2014-06-14T23:59:59.000Z

    The dynamics of the Johari–Goldstein (JG) ? relaxation and the ? relaxation in bulk metallic glasses (MGs) has been investigated by using mechanical spectroscopy combined with the Coupling Model. The ? relaxations of MGs exhibit different behaviors such as peaks, humps, and excess wings due to the different fluctuations of the chemical interactions among the constituting atoms. A universal correlation between the ? relaxation and the ? relaxation is generally found by their activation energies and relaxation times as well as the non-exponentiality parameter of the ? relaxation, which can be predicted quantitatively from the Coupling Model. Based on the quasi-point defects theory, a correlation factor ? shows a broad peak along with the ? relaxation, suggesting that the concentration and the correlation degree of the string-like configurations involved in the ? relaxation vary with increasing temperature, which challenges the previous view that the system is in an iso-configuration state below T{sub g} and may shed new light on the nature of the JG ? relaxation in metallic glasses.

  3. Dynamic Rotor Deformation and Vibration Monitoring Using a Non-Incremental Laser Doppler Distance Sensor

    SciTech Connect (OSTI)

    Pfister, Thorsten; Guenther, Philipp; Dreier, Florian; Czarske, Juergen [Technische Universitaet Dresden, Faculty of Electrical Engineering and Information Technology, Laboratory for Measurement and Testing Techniques, Helmholtzstrasse 18, D-01062 Dresden (Germany)

    2010-05-28T23:59:59.000Z

    Monitoring rotor deformations and vibrations dynamically is an important task for improving the safety and the lifetime as well as the energy efficiency of motors and turbo machines. However, due to the high rotor speed encountered in particular at turbo machines, this requires concurrently a high measurement rate and high accuracy, which can not be fulfilled by most commercially available sensors. To solve this problem, we developed a non-incremental laser Doppler distance sensor (LDDS), which is able to measure simultaneously the in-plane velocity and the out-of-plane position of moving rough solid objects with micrometer precision. In addition, this sensor concurrently offers a high temporal resolution in the microsecond range, because its position uncertainty is in principle independent of the object velocity in contrast to conventional distance sensors, which is a unique feature of the LDDS. Consequently, this novel sensor enables precise and dynamic in-process deformation and vibration measurements on rotating objects, such as turbo machine rotors, even at very high speed. In order to evidence the capability of the LDDS, measurements of rotor deformations (radial expansion), vibrations and wobbling motions are presented at up to 50,000 rpm rotor speed.

  4. Failure of maximum likelihood methods for chaotic dynamical systems School of Mathematics and Statistics, University of Western Australia, Perth, Australia

    E-Print Network [OSTI]

    Judd, Kevin

    of Mathematics and Statistics, University of Western Australia, Perth, Australia Received 23 June 2006; revised

  5. 1 Copyright 2003 by ASME Proceedings of ASME Turbo Expo 2003

    E-Print Network [OSTI]

    Thole, Karen A.

    TEMPERATURES IN A TURBINE VANE PASSAGE Andrew T. Lethander and Karen A. Thole Mechanical Engineering Department Virginia Polytechnic Institute and State University Blacksburg, VA 24060 Gary Zess and Joel Wagner Pratt increasingly important in the design of modern gas turbines due to several fundamental trends in gas turbine

  6. 13th Winter Workshop on Nuclear Dynamics W.J. Llope Marathon Key, Florida, February 1-8, 1997 Rice University

    E-Print Network [OSTI]

    Llope, William J.

    , February 1-8, 1997 Rice University TPC · 24+2 outer, and 24+2 inner, sectors built & tested · gas vessel13th Winter Workshop on Nuclear Dynamics W.J. Llope Marathon Key, Florida, February 1-8, 1997 Rice superconducting rings · Ions from A~200 to polarized-p; also p+A · Magnets look great, "Super Sunday" sextant test

  7. Hyperbolic Dynamics Todd Fisher

    E-Print Network [OSTI]

    Fisher, Todd

    Hyperbolic Dynamics Todd Fisher tfisher@math.umd.edu Department of Mathematics University of Maryland, College Park Hyperbolic Dynamics ­ p. 1/3 #12;What is a dynamical system? Phase space X, elements possible states Hyperbolic Dynamics ­ p. 2/3 #12;What is a dynamical system? Phase space X, elements

  8. Brandeis University Brown University

    E-Print Network [OSTI]

    Jiang, Huiqiang

    Institute of Technology McGill University Michigan State University New York University Northwestern University of Kansas University of Maryland, College Park University of Michigan University of MinnesotaBrandeis University Brown University California Institute of Technology Carnegie Mellon University

  9. eScholarship provides open access, scholarly publishing services to the University of California and delivers a dynamic

    E-Print Network [OSTI]

    Cavanaugh, Kyle

    Peer Reviewed Title: Synchrony in dynamics of giant kelp forests is driven by both local recruitment://www.escholarship.org/uc/item/7vw6c5gg Keywords: giant kelp, Landsat, Macrocystis pyrifera, Moran effect, population dynamics kelp (Macrocystis pyrifera) canopy biomass to examine population synchrony in southern California kelp

  10. FPGA ACCELERATION OF MOLECULAR DYNAMICS SIMULATIONS

    E-Print Network [OSTI]

    Herbordt, Martin

    ' & $ % FPGA ACCELERATION OF MOLECULAR DYNAMICS SIMULATIONS YONGFENG GU Dissertation submitted;BOSTON UNIVERSITY COLLEGE OF ENGINEERING Dissertation FPGA ACCELERATION OF MOLECULAR DYNAMICS SIMULATIONS DYNAMICS SIMULATIONS (Order No. ) YONGFENG GU Boston University, College of Engineering, 2008 Major

  11. BOSTON UNIVERSITY COLLEGE OF ENGINEERING

    E-Print Network [OSTI]

    Herbordt, Martin

    BOSTON UNIVERSITY COLLEGE OF ENGINEERING Dissertation ACCELERATING MOLECULAR DYNAMICS SIMULATIONS DYNAMICS SIMULATIONS WITH HIGH PERFORMANCE RECONFIGURABLE SYSTEMS (Order No. ) SHIHCHIN CHIU Boston..................................................................... 12 1.5.1 Acceleration of Molecular Dynamics Simulations............................ 12 1.5.2 General

  12. BOSTON UNIVERSITY COLLEGE OF ENGINEERING

    E-Print Network [OSTI]

    Herbordt, Martin

    D, Associate Professor of Electrical and Computer Engineering ABSTRACT While Molecular Dynamics Simulation (MDBOSTON UNIVERSITY COLLEGE OF ENGINEERING Dissertation SCALABLE MOLECULAR DYNAMICS SIMULATION USING #12;SCALABLE MOLECULAR DYNAMICS SIMULATION USING FPGAS AND MULTICORE PROCESSORS (Order No. ) MD

  13. FPGA Acceleration of Discrete Molecular Dynamics Simulation

    E-Print Network [OSTI]

    Herbordt, Martin

    ' & $ % FPGA Acceleration of Discrete Molecular Dynamics Simulation Joshua Model Thesis submitted UNIVERSITY COLLEGE OF ENGINEERING Thesis FPGA Acceleration of Discrete Molecular Dynamics Simulation Acceleration of Discrete Molecular Dynamics Simulation Joshua Model ABSTRACT Molecular dynamics simulation

  14. Adapted from EE363: Linear Dynamical Systems, Winter 2005-2006 Stephen Boyd -Stanford University The Kalman filter

    E-Print Network [OSTI]

    Wehenkel, Louis

    Lecture 7 The Kalman filter · Linear system driven by stochastic process · Statistical steady-state · Linear Gauss-Markov model · Kalman filter · Steady-state Kalman filter 7­1 #12;Linear system driven.e., the means propagate by the same linear dynamical system The Kalman filter 7­2 #12;now let's consider

  15. eScholarship provides open access, scholarly publishing services to the University of California and delivers a dynamic

    E-Print Network [OSTI]

    Parker, V. Thomas

    and delivers a dynamic research platform to scholars worldwide. Peer Reviewed Title: Climate Change and San://escholarship.org/uc/item/8j20685w Keywords: Salt marshes, brackish tidal wetlands, freshwater tidal wetlands, climate change, salinity, sea- level rise, Mediterranean-climate Local Identifier: jmie_sfews_11145 Abstract: Climate

  16. BMW Diesel Engines - Dynamic, Efficient and Clean

    Broader source: Energy.gov (indexed) [DOE]

    Nrburgring 2001 - DI with 2nd generation Common Rail, 1600 bar 2004 - Variable Twin Turbo - Particulate filter 2nd generation 1999 - First V8 diesel with direct injection...

  17. Real-Time Observation of Platinum Redispersion on Ceria-Based Oxide by In-situ Turbo-XAS in Fluorescence Mode

    SciTech Connect (OSTI)

    Nagai, Yasutaka; Dohmae, Kazuhiko; Tanabe, Toshitaka; Shinjoh, Hirofumi [TOYOTA Central R and D Labs., Inc., Nagakute, Aichi, 480-1192 (Japan); Takagi, Nobuyuki [TOYOTA Motor Corporation Higashi-fuji Technical Center, Shizuoka, 410-1193 (Japan); Ikeda, Yasuo [TOYOTA Motor Europe Technical Centre, Zaventem, B-1930 (Belgium); Guilera, Gemma; Pascarelli, Sakura; Newton, Mark [European Synchrotron Radiation Facility, Grenoble, F-38043 (France); Matsumoto, Shin'ichi [TOYOTA Motor Corporation, Toyota, Aichi, 471-8572 (Japan)

    2007-02-02T23:59:59.000Z

    A real-time observation of the redispersion behavior of sintered Pt on ceria-based oxide was made possible by in-situ time-resolved Turbo-XAS in fluorescence mode. 2 wt% Pt/Ce-Zr-Y mixed oxide samples were prepared, and then treated under an aging condition. The average Pt particle size measured by CO absorption method after aging was 7 nm. Redispersion treatments of the previously aged catalyst were carried out at 600 deg. C within an in-situ XAS cell in a cyclical flow of reducing/oxidizing gases. Pt L3-edge XANES spectra were collected every 1.1 second under in-situ conditions. From a change in the XANES spectra, we observed that the Pt particle size of the aged catalyst decreased from 7 to 5 nm after 60 seconds and then to 3 nm after 1000 seconds.

  18. Aachen RWTH Aarhus University Aberdeen University Adelaide University Alabama University Alberta University Amsterdam University Arizona University Auckland University Australian National University Bath University Beijing

    E-Print Network [OSTI]

    Tisdell, Chris

    Massachusetts University Massey University McGill University McMaster University Melbourne University Michigan State University Michigan University Minnesota University Monash University Montpellier UniversityAachen RWTH Aarhus University Aberdeen University Adelaide University Alabama University Alberta

  19. Social Dynamics Introduction

    E-Print Network [OSTI]

    Barrett, Jeffrey A.

    Social Dynamics Introduction Part I: Correlation and the Social Contract Introduction to part I 1: University of Utah Press. 47-69. Part II: Importance of Dynamics Introduction to part II 1. Trust, Risk Significance of Some Simple Evolutionary Models (2000) Philosophy of Science 67: 94-113. 4. Dynamics

  20. Cybersecurity Dynamics Shouhuai Xu

    E-Print Network [OSTI]

    Xu, Shouhuai

    Antonio ABSTRACT We explore the emerging field of Cybersecurity Dynamics, a candidate foundation been driving the study of security for decades -- the idea of cybersecurity dynamics emergedCybersecurity Dynamics Shouhuai Xu Department of Computer Science, University of Texas at San

  1. AUSTRALIAN NATIONAL UNIVERSITY DEPARTMENT OF NUCLEAR PHYSICS

    E-Print Network [OSTI]

    Chen, Ying

    , but was found to be a broken solder joint on the turbo 24volt relay circuit. The temperature sensor on the platform by Alistair Muirhead, found that one of the wires that provide 24v to the turbo pump relays was broken from its spark protection feed through terminal on the side of the GP3 box. The soldered

  2. An Analysis of a Turbo-Fan Used to Improve the Velocity Distribution in a Low Speed Wind-Tunnel

    E-Print Network [OSTI]

    Wells, Otis Dean

    1960-01-01T23:59:59.000Z

    , XII, (Sec. J), ed. Lanchaster, 0. E. , Princeton University Press, Princeton, New Jersey, 1959. 5. Aerod namic Theor , IV, ed. . Durand, W. F. , Durand. Reprint- ing Co. , Cal. Tech. , Cal5f. , 1945. 6. Dommasch, D. O. , Elements of Pro eller...

  3. What do University of Michigan Math Majors do? Luis Acuna has written a book on interfacing Turbo Pascal and assembly language. He teaches at the Instituto

    E-Print Network [OSTI]

    Moore, Kristen

    for Towers Perrin, a global human resources consulting firm. He is also an Associate in the Society. Erin Hendrick '00 is an Associate in the Professional Development Center for Towers Perrin, which, the research and development arm of Lucent Technologies, which produces switching and transmission equipment

  4. Princeton University has always been a dynamic institution, evolving from a two-building college in a rural town to a thriving University at the heart of a busy multifaceted community.

    E-Print Network [OSTI]

    in a rural town to a thriving University at the heart of a busy multifaceted community. The campus changed

  5. Photodissociation Dynamics Laurie J. Butler*

    E-Print Network [OSTI]

    Butler, Laurie J.

    Photodissociation Dynamics Laurie J. Butler* Department of Chemistry, UniVersity of Chicago of photodissociation dynamics over the past 30 years are reviewed. An overview of experimental techniques that have of photodissociation dynamics has grown explo- sively in the past few decades. Spearheaded by developments in laser

  6. P. J. Antsaklis, "On Dynamic Linear State Feedback," Control Systems Technical Report #55, Dept. of Electrical and Computer Engineering, University of Notre Dame, August 1987.

    E-Print Network [OSTI]

    Antsaklis, Panos

    P. J. Antsaklis, "On Dynamic Linear State Feedback," Control Systems Technical Report #55, Dept Linear State Feedback," Control Systems Technical Report #55, Dept. of Electrical and Computer Dame, August 1987. #12;P. J. Antsaklis, "On Dynamic Linear State Feedback," Control Systems Technical

  7. ‘Boundary’ an expression of the dynamic unity between man and environment Building a paradigm to unravel the mind’s fundamental kinship with the cosmos and its role as the vehicle of the universe’s unfolding meaning 

    E-Print Network [OSTI]

    Saridaki, Maria

    2012-11-28T23:59:59.000Z

    The aim of this thesis is to build a paradigm to unravel the human mind’s fundamental kinship with the cosmos and its role as the vehicle of the universe’s unfolded meaning. The concept of ‘boundary’ is presented as a ...

  8. BMW Diesel - Engine Concepts for Efficient Dynamics

    Broader source: Energy.gov (indexed) [DOE]

    "24 Hours of Nrburgring" 2001 - 2nd Gen. Common Rail (1600 bar) 2004 - Variable Twin Turbo - Diesel Particulate Filter of 2nd Gen. 1999 - First V8 Diesel Sedan in Premium...

  9. The Universal Arrow of Time V-VI: (Part V) Unpredictable dynamics (Part VI) Future of artificial intelligence - Art, not Science: Practical Application of Unpredictable Systems

    E-Print Network [OSTI]

    Oleg Kupervasser

    2013-05-23T23:59:59.000Z

    The paper consists of the two independent papers:(Part V) We see that exact equations of quantum and classical mechanics describe ideal dynamics which is reversible and leads to Poincare's returns. Real equations of physics describing observable dynamics, for example, hydrodynamic equations of viscous fluid, are irreversible and exclude Poincare's returns to the initial state. Besides, these equations describe systems in terms of macroparameters or phase distribution functions of microparameters. For many systems introduction of macroparameters that allow exhaustive describing of dynamics of the system is impossible. Their dynamics becomes unpredictable in principle, sometimes even unpredictable by the probabilistic way. We will refer to dynamics describing such system as unpredictable dynamics. Dynamics of unpredictable systems is not described and not predicted by scientific methods. Thus, the science itself puts boundaries for its applicability. But such systems can intuitively "understand itself" and "predict" the behavior "of its own" or even "communicate with each other" at intuitive level. (Part VI) Perspective of the future of artificial intellect (AI) is considered. It is shown that AI development in the future will be closer rather to art than to science. Complex dissipative systems whose behavior cannot be understood completely in principle will be the basis of AI. Nevertheless, it will not be a barrier for their practical use.

  10. Department of Physics Columbia University

    E-Print Network [OSTI]

    Millis, Andrew

    Department of Physics Columbia University Copyright A. J. Millis 2012 Dynamical Mean Field Theory: Basic ideas and cluster extensions A. J. Millis Department of Physics Columbia University Support: NSF DMR 10006282, DOE ER-046169 and ARO 056032PH #12;Department of Physics Columbia University Copyright A

  11. michigan state university college of engineering

    E-Print Network [OSTI]

    of the wave disk engine. This technology uses turbo combustion to convert liquid fuel or compressed natural gas or hydrogen into electrical power. The goal is to increase fuel efficiency for hybrid vehicles

  12. Sediment Dynamics for a Changing Future (Proceedings of the ICCE symposium held at Warsaw University of Life Sciences -SGGW, Poland, 1418 June 2010). IAHS Publ. 337, 2010.

    E-Print Network [OSTI]

    Northern British Columbia, University of

    University of Life Sciences - SGGW, Poland, 14­18 June 2010). IAHS Publ. 337, 2010. 251 Salmon at the same time imparting energy to the streambed via their spawning activity, thereby modifying

  13. Sediment Dynamics for a Changing Future (Proceedings of the ICCE symposium held at Warsaw University of Life Sciences -SGGW, Poland, 1418 June 2010). IAHS Publ. 337, 2010.

    E-Print Network [OSTI]

    Northern British Columbia, University of

    University of Life Sciences - SGGW, Poland, 14­18 June 2010). IAHS Publ. 337, 2010. 37 Impact of land use and nutrients) concentrations in the Quesnel Basin, British Columbia. The study focuses on sampling high-energy

  14. Dynamics of similar populations Geza Meszena1

    E-Print Network [OSTI]

    Meszéna, Géza

    Dynamics of similar populations G´eza Mesz´ena1 , Mats Gyllenberg2 , Frans J. Jacobs3 , Hans A. J. Metz3,4 1 E¨otv¨os Univerity, Budapest 2 University of Helsinki 3 Leiden University 4 Adaptive Dynamics by population dynamics: dni dt = ri (n1, n2, . . . , nL) ni i = 1, 2, . . . , L ni 0 for losers. Dynamics

  15. COLLOQUIUM: Controlling Quantum Dynamics | Princeton Plasma Physics...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Controlling Quantum Dynamics Professor Herschel Rabitz Princeton University Contact Information Coordinator(s): Miss Carol Ann Au caustin@pppl.gov Host(s): Dr. Elena Belova ebelova...

  16. Dependence of Turing pattern wavelength on diffusion rate Center for Nonlinear Dynamics and Department of Physics, The University of Texas at Austin, Austin,

    E-Print Network [OSTI]

    Texas at Austin. University of

    Dependence of Turing pattern wavelength on diffusion rate Qi Ouyang Center for Nonlinear Dynamics of reactants and the wavelength of Turing patterns is examined in experiments on the chlorite 0.13­ 0.28 mm varies in accord with the predicted relation for Turing patterns, D1/2 . Moreover

  17. Shock-Wave Theory for Rupture of Rubber Center for Nonlinear Dynamics and Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA

    E-Print Network [OSTI]

    Texas at Austin. University of

    Shock-Wave Theory for Rupture of Rubber M. Marder Center for Nonlinear Dynamics and Department January 2005) This Letter presents a theory for the rupture of rubber. Unlike conventional cracks, ruptures in rubber travel faster than the speed of sound and consist of two oblique shocks that meet

  18. Regenerative Heater Optimization for Steam Turbo-Generation Cycles of Generation IV Nuclear Power Plants with a Comparison of Two Concepts for the Westinghouse International Reactor Innovative and Secure (IRIS)

    SciTech Connect (OSTI)

    Williams, W.C.

    2002-08-01T23:59:59.000Z

    The intent of this study is to discuss some of the many factors involved in the development of the design and layout of a steam turbo-generation unit as part of a modular Generation IV nuclear power plant. Of the many factors involved in the design and layout, this research will cover feed water system layout and optimization issues. The research is arranged in hopes that it can be generalized to any Generation IV system which uses a steam powered turbo-generation unit. The research is done using the ORCENT-II heat balance codes and the Salisbury methodology to be reviewed herein. The Salisbury methodology is used on an original cycle design by Famiani for the Westinghouse IRIS and the effects due to parameter variation are studied. The vital parameters of the Salisbury methodology are the incremental heater surface capital cost (S) in $/ft{sup 2}, the value of incremental power (I) in $/kW, and the overall heat transfer coefficient (U) in Btu/ft{sup 2}-degrees Fahrenheit-hr. Each is varied in order to determine the effects on the cycles overall heat rate, output, as well as, the heater surface areas. The effects of each are shown. Then the methodology is then used to compare the optimized original Famiani design consisting of seven regenerative feedwater heaters with an optimized new cycle concept, INRC8, containing four regenerative heaters. The results are shown. It can be seen that a trade between the complexity of the seven stage regenerative Famiani cycle and the simplicity of the INRC8 cycle can be made. It is desired that this methodology can be used to show the ability to evaluate modularity through the value of size a complexity of the system as well as the performance. It also shows the effectiveness of the Salisbury methodology in the optimization of regenerative cycles for such an evaluation.

  19. Advanced Radar Research Center The University of Oklahoma seeks an exceptional, dynamic leader to serve as Director of its Advanced Radar Research Center

    E-Print Network [OSTI]

    Oklahoma, University of

    industry and federal agencies and carries out a vigorous program of teaching, research, and service in the world, housing twelve University of Oklahoma, state, and federal organizations with more than 650 of Electrical and Computer Engineering is housed nearby in the new Devon Energy Hall. The ARRC Director provides

  20. Shape Dynamics. An Introduction

    E-Print Network [OSTI]

    Julian Barbour

    2011-05-01T23:59:59.000Z

    Shape dynamics is a completely background-independent universal framework of dynamical theories from which all absolute elements have been eliminated. For particles, only the variables that describe the shapes of the instantaneous particle configurations are dynamical. In the case of Riemannian three-geometries, the only dynamical variables are the parts of the metric that determine angles. The local scale factor plays no role. This leads to a shape-dynamic theory of gravity in which the four-dimensional diffeomorphism invariance of general relativity is replaced by three-dimensional diffeomorphism invariance and three-dimensional conformal invariance. Despite this difference of symmetry groups, it is remarkable that the predictions of the two theories -- shape dynamics and general relativity -- agree on spacetime foliations by hypersurfaces of constant mean extrinsic curvature. However, the two theories are distinct, with shape dynamics having a much more restrictive set of solutions. There are indications that the symmetry group of shape dynamics makes it more amenable to quantization and thus to the creation of quantum gravity. This introduction presents in simple terms the arguments for shape dynamics, its implementation techniques, and a survey of existing results.

  1. Cyclic Macromolecules: Dynamics and Nonlinear Rheology, Final Report DOE Award # DE-FG02-05ER46218, Texas Tech University

    SciTech Connect (OSTI)

    Gregory B. McKenna; Robert H. Grubbs; Julia A. Kornfield

    2012-04-25T23:59:59.000Z

    The work described in the present report had the original goal to produce large, entangled, ring polymers that were uncontaminated by linear chains and to characterize by rheological methods the dynamics of these rings. While the work fell short of this specific goal, the outcomes of the research performed under support from this grant provided novel macromolecular synthesis methods, new separation methods for ring and linear chains, and novel rheological data on bottle brush polymers, wedge polymers and dendron-based ring molecules. The grant funded a total of 8 archival manuscripts and one patent, all of which are attached to the present report.

  2. Development of PUNDA (Parametric Universal Nonlinear Dynamics Approximator) Models for Self-Validating Knowledge-Guided Modelling of Nonlinear Processes in Particle Accelerators \\& Industry

    SciTech Connect (OSTI)

    Sayyar-Rodsari, Bijan; Schweiger, Carl; Hartman, Eric

    2007-10-07T23:59:59.000Z

    The difficult problems being tackled in the accelerator community are those that are nonlinear, substantially unmodeled, and vary over time. Such problems are ideal candidates for model-based optimization and control if representative models of the problem can be developed that capture the necessary mathematical relations and remain valid throughout the operation region of the system, and through variations in system dynamics. The goal of this proposal is to develop the methodology and the algorithms for building high-fidelity mathematical representations of complex nonlinear systems via constrained training of combined first-principles and neural network models.

  3. Universality class of holographic superconductors

    E-Print Network [OSTI]

    Kengo Maeda; Makoto Natsuume; Takashi Okamura

    2010-05-14T23:59:59.000Z

    We study "holographic superconductors" in various spacetime dimensions. We compute most of the static critical exponents in the linear perturbations and show that they take the standard mean-field values. We also consider the dynamic universality class for these models and show that they belong to model A with dynamic critical exponent z=2.

  4. Prof. Michael Mauel Columbia University

    E-Print Network [OSTI]

    Mauel, Michael E.

    Prof. Michael Mauel Columbia University Exploring Plasma Dynamics with Laboratory Magnetospheres, and control the high-temperature plasma trapped in three large laboratory magneto- spheres, at Columbia University, MIT, and the Uni- versity of Tokyo. With its high-field superconduct- ing magnets, the Levitated

  5. FACILITATORY NEURAL DYNAMICS FOR PREDICTIVE EXTRAPOLATION

    E-Print Network [OSTI]

    Choe, Yoonsuck

    FACILITATORY NEURAL DYNAMICS FOR PREDICTIVE EXTRAPOLATION A Dissertation by HEE JIN LIM Submitted DYNAMICS FOR PREDICTIVE EXTRAPOLATION A Dissertation by HEE JIN LIM Submitted to Texas A&M University: Computer Science #12;iii ABSTRACT Facilitatory Neural Dynamics for Predictive Extrapolation. (August 2006

  6. Volvo Super Truck Overview and Approach

    Broader source: Energy.gov (indexed) [DOE]

    State University Volvo Technology High Efficiency Combustion - Waste Heat Recovery - Turbo-Compound - Downspeeding - ... Advanced Driver Aids Rolling Resistance Reduction...

  7. Dynamic Automata in Larva John Paul Cassar

    E-Print Network [OSTI]

    Pace, Gordon J.

    Dynamic Automata in Larva John Paul Cassar Dept. of Comp. Science University of Malta jcas0021@um.edu.mt Christian Colombo Dept. of Comp. Science University of Malta christian.colombo@um.edu.mt Gordon Pace Dept. of Comp. Science University of Malta gordon.pace@um.edu.mt ABSTRACT As computer systems become larger

  8. Copyright 2000 by ASME1 ASME paper 2000-GT-0253, ASME IGTI Turbo-Expo-2000, Munich, Germany, May 8-11, 2000.

    E-Print Network [OSTI]

    Dennis, Brian

    TURBINE BLADE MATERIAL Zhen-Xue Han 1 Department of Mechanical and Aerospace Engineering The University-field and in the solid material of the structure thus automatically predicting correct magnitudes and distribution temperature of internally cooled gas turbine blade. This approach eliminates the need to specify hot surface

  9. amplitude dynamic loading: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    University February 6, 2001 Abstract We present the load-calculus, used to model dynamic loading, and prove it sound. The calculus extends the polymorphic -calculus with a...

  10. Vincennes University

    E-Print Network [OSTI]

    Julie Napier

    2015-04-22T23:59:59.000Z

    150 N. University Street. West Lafayette IN, 47907-2067 ... Highest degree from an accredited college/university ... ______ Library professional staff. ______ ...

  11. A Diffusion Model in Population Genetics with Mutation and Dynamic

    E-Print Network [OSTI]

    O'Leary, Michael

    A Diffusion Model in Population Genetics with Mutation and Dynamic Fitness Mike O'Leary Department of Mathematics Towson University May 24, 2008 Mike O'Leary (Towson University) A Diffusion Model in Genetics May Miller, Georgetown University Mike O'Leary (Towson University) A Diffusion Model in Genetics May 24, 2008

  12. NORTHWESTERN UNIVERSITY Qualification of Autonomous Crack Monitoring Systems

    E-Print Network [OSTI]

    NORTHWESTERN UNIVERSITY Qualification of Autonomous Crack Monitoring Systems A Thesis Submitted Term or Static Testing Equipment Setup.............................................29 Long Term Response.....................................................................33 Dynamic Testing Equipment

  13. Dynamics of generalized tachyon field

    E-Print Network [OSTI]

    Rong-Jia Yang; Jingzhao Qi

    2012-08-06T23:59:59.000Z

    We investigate the dynamics of generalized tachyon field in FRW spacetime. We obtain the autonomous dynamical system for the general case. Because the general autonomous dynamical system cannot be solved analytically, we discuss two cases in detail: $\\beta=1$ and $\\beta=2$. We find the critical points and study their stability. At these critical points, we also consider the stability of the generalized tachyon field, which is as important as the stability of critical points. The possible final states of the universe are discussed.

  14. VOLUME 81, NUMBER 15 P H Y S I C A L R E V I E W L E T T E R S 12 OCTOBER 1998 Universal Features in the Growth Dynamics of Complex Organizations

    E-Print Network [OSTI]

    Stanley, H. Eugene

    Meyer,1 and H. Eugene Stanley1 1 Center for Polymer Studies and Department of Physics, Boston University

  15. Brain dynamics promotes function Carlos Lourenco

    E-Print Network [OSTI]

    Lisboa, Universidade Técnica de

    Brain dynamics promotes function Carlos Louren¸co 1 Faculty of Sciences of the University of Lisbon, 1049-001 Lisboa - Portugal Abstract. Dynamical structure in the brain promotes biological func- tion. Computational scientists have new opportunities to receive 'algorithmic' inspiration from brain processes

  16. Idealized Test Cases for Dynamical Core Experiments

    E-Print Network [OSTI]

    Jablonowski, Christiane

    Idealized Test Cases for Dynamical Core Experiments Christiane Jablonowski (University of Michigan-13/2006 #12;Motivation · Test cases for 3D dynamical cores on the sphere ­ are hard to find in the literature groups ­ lack standardized & easy-to-use analysis techniques · Idea: Establish a collection of test cases

  17. Complex Dynamics

    E-Print Network [OSTI]

    Complex Dynamics Bernardo Da Costa, Koushik Ramachandran, Jingjing Qu, and I had a two semester learning seminar in complex analysis and potential ...

  18. Quintessence Scalar Field: A Dynamical Systems Study

    E-Print Network [OSTI]

    Nandan Roy; Narayan Banerjee

    2014-02-27T23:59:59.000Z

    The present work deals with a dynamical systems study of quintessence potentials leading to the present accelerated expansion of the universe. The principal interest is to check for late time attractors which give an accelerated expansion for the universe. Two examples are worked out, namely the exponential and the power-law potentials.

  19. A Diffusion Model in Population Genetics with Mutation and Dynamic Fitness

    E-Print Network [OSTI]

    O'Leary, Michael

    A Diffusion Model in Population Genetics with Mutation and Dynamic Fitness Mike O'Leary Department of Mathematics Towson University PDE Seminar Vanderbilt University November 2008 Mike O'Leary (Towson University are joint with Judith Miller, Georgetown University. Mike O'Leary (Towson University) A Diffusion Model

  20. Charles Darwin University Flinders University Griffith University James Cook University La Trobe University Murdoch University The University of Newcastle Biography for GLOVER, Professor Barney

    E-Print Network [OSTI]

    University Murdoch University The University of Newcastle Biography for GLOVER, Professor Barney Vice Chancellor, Charles Darwin University Professor Barney Glover is Vice-Chancellor of Charles Darwin University

  1. University Profile University of Canterbury

    E-Print Network [OSTI]

    Hickman, Mark

    University Profile 2007­2009 #12;University of Canterbury PROFILE 2007 - 2009 Submitted to the Tertiary Education Commission, 31 October, 2006 #12;University of Canterbury Profile 2007-2009 Page 2 of 64 #12;Contents Page Profile Purpose and Structure 4 Part A: Strategic Direction 5 Part B: Key Strategic

  2. 12University Research Priority Programs

    E-Print Network [OSTI]

    Zürich, Universität

    12University Research Priority Programs Asia and Europe Dynamics of Healthy Aging Ethics Evolution Market Regulation Social Networks Language and Space Systems Biology/Functional Genomics Translational Cancer Research Solar Light to Chemical Energy Conversion #12;Contact Dr. Cornelia Schauz Research

  3. van der Waerden's Theorem and Topological Dynamics Proof Mining

    E-Print Network [OSTI]

    Gerhardy, Philipp

    van der Waerden's Theorem and Topological Dynamics Proof Mining Proof Analysis Conclusion Proof Mining in Topological Dynamics Philipp Gerhardy Department of Mathematics University of Oslo Logic Colloquium 2008, Bern, Switzerland, July 3-8. Philipp Gerhardy Proof Mining in Topological Dynamics #12;van

  4. Beam Dynamics Challenges in High Energy Physics Accelerators!

    E-Print Network [OSTI]

    Beam Dynamics Challenges in High Energy Physics Accelerators! Alexander Valishev! University/1/2014!A. Valishev | Beam Dynamics Challenges in HEP Accelerators!2! #12;The Olympic Motto for Accelerators! 12/1/2014!A. Valishev | Beam Dynamics Challenges in HEP Accelerators!3! ENERGY INTENSITY BRIGHTNESS

  5. Dynamics of the stratospheric circulation response to climate change

    E-Print Network [OSTI]

    Dynamics of the stratospheric circulation response to climate change Michael Sigmond, University the world have employed chemistry climate models (CCMs) to predict the future stratospheric dynamical (Eyring et al., 2005). Despite the abundance of simula- tions, however, many dynamical issues remain

  6. MATH3395: Dynamical Systems Dr A.M. Rucklidge

    E-Print Network [OSTI]

    Rucklidge, Alastair

    dynamics, which arise in a variety of contexts in biology, chemistry, physics, economics and engineering example) MATH2390/2391. Basic linear algebra is required, and there will be some use of the notion An Introduction to Economic Dynamics Cambridge University Press 2001; R. Stone Economic Dynamics Cambridge

  7. Mesoscale ocean dynamics modeling

    SciTech Connect (OSTI)

    mHolm, D.; Alber, M.; Bayly, B.; Camassa, R.; Choi, W.; Cockburn, B.; Jones, D.; Lifschitz, A.; Margolin, L.; Marsden, L.; Nadiga, B.; Poje, A.; Smolarkiewicz, P. [Los Alamos National Lab., NM (United States); Levermore, D. [Arizona Univ., Tucson, AZ (United States)

    1996-05-01T23:59:59.000Z

    This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The ocean is a very complex nonlinear system that exhibits turbulence on essentially all scales, multiple equilibria, and significant intrinsic variability. Modeling the ocean`s dynamics at mesoscales is of fundamental importance for long-time-scale climate predictions. A major goal of this project has been to coordinate, strengthen, and focus the efforts of applied mathematicians, computer scientists, computational physicists and engineers (at LANL and a consortium of Universities) in a joint effort addressing the issues in mesoscale ocean dynamics. The project combines expertise in the core competencies of high performance computing and theory of complex systems in a new way that has great potential for improving ocean models now running on the Connection Machines CM-200 and CM-5 and on the Cray T3D.

  8. Dynamics of Charged Events

    SciTech Connect (OSTI)

    Bachas, Constantin [Laboratoire de Physique Theorique de l'Ecole Normale Superieure, 24 rue Lhomond, 75231 Paris cedex (France); Bunster, Claudio [Centro de Estudios Cientificos (CECS), Avenida Arturo Prat 514, Valdivia (Chile); Henneaux, Marc [Physique Theorique et Mathematique, Universite Libre de Bruxelles and International Solvay Institutes, ULB Campus Plaine C.P. 231, 1050 Bruxelles (Belgium); Centro de Estudios Cientificos (CECS), Avenida Arturo Prat 514, Valdivia (Chile)

    2009-08-28T23:59:59.000Z

    In three spacetime dimensions the world volume of a magnetic source is a single point, an event. We make the event dynamical by regarding it as the imprint of a flux-carrying particle impinging from an extra dimension. This can be generalized to higher spacetime dimensions and to extended events. We exhibit universal observable consequences of the existence of events and argue that events are as important as particles or branes. We explain how events arise on the world volume of membranes in M theory, and in a Josephson junction in superconductivity.

  9. OLD DOMINION UNIVERSITY University Policies and Procedures

    E-Print Network [OSTI]

    AND ADMINISTRATOR RECRUITMENT FUNDING PROCEDURE Statement: University Recruitment Budget (1) The university6010 - 1 OLD DOMINION UNIVERSITY University Policies and Procedures 6010 - FACULTY maintains a central budget, called the University Recruitment Budget, for the support of essential

  10. 1 Columbia University--The University Seminars COLUMBIA UNIVERSITY

    E-Print Network [OSTI]

    Champagne, Frances A.

    1 Columbia University--The University Seminars COLUMBIA UNIVERSITY T H E U N I V E R S I T Y S E M. Belknap Professor Emeritus of Russian, Columbia University, Director Emeritus of The University Seminars, Columbia University Susan Boynton Associate Professor of Music, Columbia University Ester Fuchs Professor

  11. Rotational dynamics of entangled polymers

    E-Print Network [OSTI]

    Jean-Charles Walter; Michiel Laleman; Marco Baiesi; Enrico Carlon

    2014-09-01T23:59:59.000Z

    Some recent results on the rotational dynamics of polymers are reviewed and extended. We focus here on the relaxation of a polymer, either flexible or semiflexible, initially wrapped around a rigid rod. We also study the steady polymer rotation generated by a constant torque on the rod. The interplay of frictional and entropic forces leads to a complex dynamical behavior characterized by non-trivial universal exponents. The results are based on extensive simulations of polymers undergoing Rouse dynamics and on an analytical approach using force balance and scaling arguments. The analytical results are in general in good agreement with the simulations, showing how a simplified approach can correctly capture the complex dynamical behavior of rotating polymers.

  12. PETER LEE OLSON Present Position: Professor of Geophysical Fluid Dynamics

    E-Print Network [OSTI]

    Olson, Peter L.

    Power Plant Siting Program Scientific Steering Panel, NASA GRM mission University Corporation of California, Berkeley, California M.A. Geophysics, June 1974, University of California, Berkeley, California B of California, Berkeley (1980) Assistant Professor of Geophysical Fluid Dynamics, Johns Hopkins University

  13. PETER LEE OLSON Present Position: Professor of Geophysical Fluid Dynamics

    E-Print Network [OSTI]

    Olson, Peter L.

    Union, Tectonophysics Section Scientific Advisory Board, Maryland Power Plant Siting Program Scientific Dynamics EDUCATION: Ph.D. Geophysics, June 1977, University of California, Berkeley, California M.A. Geophysics, June 1974, University of California, Berkeley, California B.A. Geology, June 1972, University

  14. Dynamical Transition and Heterogeneous Hydration Dynamics in RNA

    E-Print Network [OSTI]

    Jeseong Yoon; Jong-Chin Lin; Changbong Hyeon; D. Thirumalai

    2014-04-24T23:59:59.000Z

    Enhanced dynamical fluctuations of RNAs, facilitated by a network of water molecules with strong interactions with RNA, are suspected to be critical in their ability to respond to a variety of cellular signals. Using atomically detailed molecular dynamics simulations at various temperatures of purine (adenine)- and preQ$_1$ sensing riboswitch aptamers, we show that water molecules in the vicinity of RNAs undergo complex dynamics depending on the local structures of the RNAs. The overall lifetimes of hydrogen bonds (HBs) of surface bound waters are more than at least 1-2 orders of magnitude longer than bulk water. Slow hydration dynamics, revealed in non-Arrhenius behavior of the relaxation time, arises from high activation barriers to break water hydrogen bonds with a nucleotide and by reduced diffusion of water. The relaxation kinetics at specific locations in the two RNAs show a broad spectrum of time scales reminiscent of glass-like behavior, suggesting that the hydration dynamics is highly heterogeneous. Both RNAs undergo dynamic transition at $T = T_D \\gtrsim 200$ K as assessed by the mean square fluctuation of hydrogen atoms $\\langle x^2\\rangle$, which undergoes an abrupt harmonic-to-anharmonic transition at $T_D$. The near universal value of $T_D$ found for these RNAs and previously for tRNA is strongly correlated with changes in hydration dynamics as $T$ is altered. Hierarchical dynamics of waters associated with the RNA surface, revealed in the motions of distinct classes of water with well-separated time scales, reflects the heterogeneous local environment on the molecular surface of RNA. At low temperatures slow water dynamics predominates over structural transitions. Our study demonstrates that the complex interplay of dynamics between water and local environment in the RNA structures could be a key determinant of the functional activities of RNA.

  15. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Fernandez, Thomas

    Department of Computing Science and Mathematics University of Stirling Gen-O-Fix: An embeddable and Mathematics University of Stirling Gen-O-Fix: An embeddable framework for Dynamic Adaptive Genetic Improvement and Mathematics University of Stirling Stirling FK9 4LA, Scotland Telephone +44 1786 467 421, Facsimile +44 1786

  16. Introduction Linear Dynamics

    E-Print Network [OSTI]

    Zeghib, Abdelghani

    Introduction Results Linear Dynamics Lorentz Dynamics Actions of discrete groups on stationary Piccione) Geodeycos Meeting, Lyon, 28-30 April 2010 Abdelghani Zeghib Dynamics on Lorentz manifolds #12;Introduction Results Linear Dynamics Lorentz Dynamics Motivations and questions Examples 1 Introduction

  17. Attractors, Universality and Inflation

    E-Print Network [OSTI]

    Sean Downes; Bhaskar Dutta; Kuver Sinha

    2012-07-27T23:59:59.000Z

    Studies of the initial conditions for inflation have conflicting predictions from exponential suppression to inevitability. At the level of phase space, this conflict arises from the competing intuitions of CPT invariance and thermodynamics. After reviewing this conflict, we enlarge the ensemble beyond phase space to include scalar potential data. We show how this leads to an important contribution from inflection point inflation, enhancing the likelihood of inflation to an inverse cubic power law. In the process, we emphasize the attractor dynamics of the gravity-scalar system and the existence of universality classes from inflection point inflation. Finally, we comment on the predictivity of inflation in light of these results.

  18. DIMACS Center Rutgers University

    E-Print Network [OSTI]

    Hopkins University Andrew Patrick, NRC Canada Norman Sadeh, Carnegie Mellon University Working Group University Mark Ackerman, University of Michigan Fabian Monrose, Johns Hopkins University Andrew Patrick, NRC Canada Norman Sadeh, Carnegie Mellon University Workshop: Cryptography: Theory Meets Practice Dates

  19. ADMINISTRATIVE UNIVERSITY POLICY

    E-Print Network [OSTI]

    ADMINISTRATIVE UNIVERSITY POLICY FACULTY UNIVERSITY POLICY STUDENT UNIVERSITY POLICY Issue stakeholder list "Log-In" of Proposed University Policy with the University Compliance Committee (UCC) UCC identifies which track (i.e., Administrative, Faculty, or Student) the proposed University Policy

  20. CONSORTIUM MEMBERS EU Universities

    E-Print Network [OSTI]

    Heermann, Dieter W.

    coordinator > University of Tirana, Albania > University of Sarajevo, Bosnia & Herzegovina > South East Foundation, Belgium > University of Tuzla, Bosnia & Herzegovina > Roma Virtual Network, Israel > University

  1. University of Michigan, Ann Arbor Indiana University, Bloomington

    E-Print Network [OSTI]

    Wu, Yih-Min

    / 1 #12; 2005 4 University of Michigan, Ann Arbor Indiana University, Bloomington University of Illinois, Urbana-Champagne University of Michigan, Ann Arbor 19 Center University of Michigan, Georgetown University, University of Nebraska, University of Kansas University

  2. Dynamical Heterogeneities in Grains and Foams

    E-Print Network [OSTI]

    Olivier Dauchot; Douglas J. Durian; Martin van Hecke

    2010-10-05T23:59:59.000Z

    Dynamical heterogeneities have been introduced in the context of the glass transition of molecular liquids and the lengthscale associated with them has been argued to be at the origin of the observed quasi-universal behaviour of glassy systems. Dense amorphous packings of granular media and foams also exhibit slow dynamics, intermittency and heterogeneities. We review a number of recent experimental studies of these systems, where one has direct access to the relevant space-time dynamics, allowing for direct visualisations of the dynamical heterogeneities. On one hand these visualisations provide a unique opportunity to access the microscopic mechanisms responsible for the growth of dynamical correlations. On the other hand focussing on the differences in these heterogeneities in microscopically different systems allows to discuss the range of the analogies between molecular thermal glasses and athermal glasses such as granular media and foams. Finally this review is the opportunity to discuss various approaches to actually extract quantitatively the dynamical lengthscale from experimental data.

  3. Dynamic simulation of 10 kW Brayton cryocooler for HTS cable

    SciTech Connect (OSTI)

    Chang, Ho-Myung; Park, Chan Woo [Hong Ik University, Department of Mechanical Engineering, Seoul, 121-791 (Korea, Republic of); Yang, Hyung Suk; Hwang, Si Dole [KEPCO Research Institute, Daejeon, 305-760 (Korea, Republic of)

    2014-01-29T23:59:59.000Z

    Dynamic simulation of a Brayton cryocooler is presented as a partial effort of a Korean governmental project to develop 1?3 km HTS cable systems at transmission level in Jeju Island. Thermodynamic design of a 10 kW Brayton cryocooler was completed, and a prototype construction is underway with a basis of steady-state operation. This study is the next step to investigate the transient behavior of cryocooler for two purposes. The first is to simulate and design the cool-down process after scheduled or unscheduled stoppage. The second is to predict the transient behavior following the variation of external conditions such as cryogenic load or outdoor temperature. The detailed specifications of key components, including plate-fin heat exchangers and cryogenic turbo-expanders are incorporated into a commercial software (Aspen HYSYS) to estimate the temporal change of temperature and flow rate over the cryocooler. An initial cool-down scenario and some examples on daily variation of cryocooler are presented and discussed, aiming at stable control schemes of a long cable system.

  4. Montgomery, *University

    E-Print Network [OSTI]

    Zink+, Doug Montgomery, Jin Ho Hahm# National Institute of Standards and Technology (NIST) *University Label table Label table APIs Label routing APIs RSVP label APIs user level kernel level NIST Switch 6

  5. Proceedings of ASME TURBO EXPO 2002

    E-Print Network [OSTI]

    Thole, Karen A.

    turbulence characteristic of the flow exiting the combustor of advanced gas turbine engines. A number to increases in thermal load on high-pressure turbine blading due to high combustor exit temperatures in the combustor. The present research focuses on the effects of combustor exit 1 #12;freestream turbulence

  6. Low emission turbo compound engine system

    DOE Patents [OSTI]

    Vuk; Carl T. (Denver, IA)

    2011-05-31T23:59:59.000Z

    A diesel or HHCI engine has an air intake and an exhaust for products of combustion. A pair of turbochargers receive the products of combustion in a series relationship and an exhaust aftertreatment device receive the products of combustion from the downstream turbine. A power turbine receives the output from the exhaust aftertreatment device and an EGR system of the power turbine passes a selected portion of the output to a point upstream of the upstream turbocharger compressor. A device adds fuel to the aftertreatment device to regenerate the particulate filter and the power turbine recoups the additional energy. The power turbine may be used to drive accessories or the prime output of the engine.

  7. Advanced Turbo-Charging Research and Development

    SciTech Connect (OSTI)

    None

    2008-02-27T23:59:59.000Z

    The objective of this project is to conduct analysis, design, procurement and test of a high pressure ratio, wide flow range, and high EGR system with two stages of turbocharging. The system needs to meet the stringent 2010MY emissions regulations at 20% + better fuel economy than its nearest gasoline competitor while allowing equivalent vehicle launch characteristics and higher torque capability than its nearest gasoline competitor. The system will also need to meet light truck/ SUV life requirements, which will require validation or development of components traditionally used only in passenger car applications. The conceived system is termed 'seriessequential turbocharger' because the turbocharger system operates in series at appropriate times and also sequentially when required. This is accomplished using intelligent design and control of flow passages and valves. Components of the seriessequential system will also be applicable to parallel-sequential systems which are also expected to be in use for future light truck/SUV applications.

  8. Zero Emissions Coal Syngas Oxygen Turbo Machinery

    SciTech Connect (OSTI)

    Dennis Horazak

    2010-12-31T23:59:59.000Z

    Siemens Energy, Inc. (formerly Siemens Westinghouse Power Corporation) worked with Clean Energy Systems and Florida Turbine Technologies to demonstrate the commercial feasibility of advanced turbines for oxy-fuel based power systems that discharge negligible CO{sub 2} into the atmosphere. The approach builds upon ultra supercritical steam turbine and advanced gas turbine technology with the goal of attaining plant efficiencies above 50% in the 2015 timeframe. Conceptual designs were developed for baseline, near term, and long term oxy-fuel turbine cycles, representing commercial introductions of increasingly advanced thermal conditions and increasing exposure to steam-CO{sub 2} mixtures. An economic analysis and market demand study was performed by Science Applications International Corp. (SAIC), and indicated that long-term oxy-fuel turbine cycles start to look attractive in 2025 when the CO{sub 2} tax is assumed to reach $40/ ton, and by 2030 it has a clear advantage over both IGCC with sequestration and pulverized coal with sequestration. A separate risk analysis of the oxy-fuel combustor, HP turbine, re-heater, and IP turbine of the long-term cycle identified and categorized risks and proposed mitigation measures. In 2007 the program began to focus on a potential oxy-fuel turbine power generation demonstration project in the 2012 -13 time period while still maintaining a link to the requirements of the long-term oxy-syngas cycle. The SGT-900 turbine was identified as the best fit for modification into an intermediate pressure turbine (IPT) for this application. The base metals, bond coats, thermal barrier coatings (TBCs), and rotor materials used in the SGT-900 were tested for their ability to operate in the steam- CO{sub 2} environment of the oxy-fuel OFT-900. Test results indicated that these same materials would operate satisfactorily, and the plan, is to use SGT-900materials for the OFT-900. Follow-on programs for corrosion testing and evaluation of crack growth rates in oxy-fuel environments have been proposed to build on these results and provide quantifiable assessments of the effects of oxy-fuel environments on the service lives of turbine components.

  9. Wilson TurboPower | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty Edit withTianlinPapers Home Kyoung's picture SubmittedWielandJump to:

  10. This article was downloaded by: [Northeastern University] On: 17 October 2011, At: 10:29

    E-Print Network [OSTI]

    Buldyrev, Sergey

    , Yeshiva University, New York, New York e Institute of High Performance Computing, Singapore Available Institute of High Performance Computing Singapore A combined molecular dynamics and finite element model

  11. University Archives University of Missouri at Columbia

    E-Print Network [OSTI]

    Taylor, Jerry

    University Archives University of Missouri at Columbia 703 Lewis Hall University of Missouri-Columbia Archives of the University of Missouri at Columbia reserves the right to refuse permission to individuals agree to credit the University Archives of the University of Missouri at Columbia in accordance

  12. Fissile solution dynamics: Student research

    SciTech Connect (OSTI)

    Hetrick, D.L.

    1994-09-01T23:59:59.000Z

    There are two research projects in criticality safety at the University of Arizona: one in dynamic simulation of hypothetical criticality accidents in fissile solutions, and one in criticality benchmarks using transport theory. We have used the data from nuclear excursions in KEWB, CRAC, and SILENE to help in building models for solution excursions. An equation of state for liquids containing gas bubbles has been developed and coupled to point-reactor dynamics in an attempt to predict fission rate, yield, pressure, and kinetic energy. It appears that radiolytic gas is unimportant until after the first peak, but that it does strongly affect the shape of the subsequent power decrease and also the dynamic pressure.

  13. UNIVERSITY STANDARDS AND REGULATIONS

    E-Print Network [OSTI]

    Royer, Dana

    2014­2015 UNIVERSITY STANDARDS AND REGULATIONS #12;Wesleyan University does not discriminate STANDARDS OF CONDUCT

  14. UNIVERSITY STANDARDS AND REGULATIONS

    E-Print Network [OSTI]

    Royer, Dana

    2013­2014 UNIVERSITY STANDARDS AND REGULATIONS #12;Wesleyan University does not discriminate STANDARDS OF CONDUCT

  15. UNIVERSITY OF ABERDEEN UNIVERSITY COURT

    E-Print Network [OSTI]

    Levi, Ran

    from Talisman towards student scholarships and from a number of oil companies towards a centre to be a post-doctoral researcher. The University had been ranked as one of the top twenty institutions outside

  16. "Dark energy" as conformal dynamics of space

    E-Print Network [OSTI]

    D. Burlankov

    2006-10-23T23:59:59.000Z

    The exact solution for dynamic of conform-flat space homogeneous since dynamic equation is given. Conform mode of space metric changing in Global time theory has negative energy density. Swap of energy to this mode from another ones lead to increasing of Universe homogeneity although probability of this swap from local objects is negligibly small. Conform mode is corresponding to "dark energy" in observation astronomy.

  17. The dynamic response of heated glass

    E-Print Network [OSTI]

    Sewall, Roy Edward

    1972-01-01T23:59:59.000Z

    rates of strain. This research was prompted, in part, by NASA studies on ductile-type craters in glassy lunar rocks. The dynamic response of Apollo spacecraft windows, made of fused silica, also led to this research. The investigation consists... Response of Heated Glass. (December 1972) Roy Edward Sewall, B. S. , Texas AS? University Directed by: Dr. James L. Rand The purpose of this research is to investigate the dynamic behavior of fused silica glass subjected to high temperatures and high...

  18. A visual simulation playground for engineering dynamics

    E-Print Network [OSTI]

    Fong, Donald Brian

    2008-10-10T23:59:59.000Z

    A VISUAL SIMULATION PLAYGROUND FOR ENGINEERING DYNAMICS A Thesis by DONALD BRIAN FONG Submitted to the O ce of Graduate Studies of Texas A&M University in partial ful llment of the requirements for the degree of MASTER OF SCIENCE August 2008 Major... Subject: Visualization Sciences A VISUAL SIMULATION PLAYGROUND FOR ENGINEERING DYNAMICS A Thesis by DONALD BRIAN FONG Submitted to the O ce of Graduate Studies of Texas A&M University in partial ful llment of the requirements for the degree of MASTER...

  19. Introduction to Dynamic Distributed

    E-Print Network [OSTI]

    Roma "La Sapienza", Università di

    Introduction to Dynamic Distributed SystemsSystems #12;Outline Introduction Churn Building Applications in Dynamic Distributed Systems RegistersRegisters Eventual Leader election Connectivity in Dynamic Distributed Systems #12;Dynamic Distributed Systems: Context & Motivations Advent of Complex Distributed

  20. Flavor Dynamics

    E-Print Network [OSTI]

    Michael Murray; for the BRAHMS Collaboration

    2007-10-24T23:59:59.000Z

    The purpose of BRAHMS is to survey the dynamics of relativistic heavy ion (as well as pp and d-A) collisions over a very wide range of rapidity and transverse momentum. The sum of these data may give us a glimpse of the initial state of the system, its transverse and longitudinal evolution and how the nature of the system changes with time. Here I will concentrate on the origin and dynamics of the light flavors, i.e. the creation and transport of the up, down and strange quarks. The results presented here are certainly not the end of the story. It is my hope that in a few years new detectors will reveal the rapidity dependence of the charm and bottom quarks.

  1. Monitoring EGS Stimulation and Reservoir Dynamics with InSAR...

    Broader source: Energy.gov (indexed) [DOE]

    Monitoring EGS Stimulation and Reservoir Dynamics with InSAR and MEQ, DE-EE0005510 PI: Nicholas C. Davatzes Temple University Topic 4: Observation Tools and Data Collection System...

  2. Chemical Dynamics at Metal Surfaces: The Role of Electronic Excitation...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Chemical Dynamics at Metal Surfaces: The Role of Electronic Excitations Mar 06 2015 11:00 AM - 12:00 PM John Tully, Yale University, New Haven, Connecticut Joint Institute for...

  3. Robot Arm Control Exploiting Natural Dynamics Matthew Williamson

    E-Print Network [OSTI]

    Robot Arm Control Exploiting Natural Dynamics Matthew Williamson M.Eng, University of Oxford (1993 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Arthur C. Chairman, Departmental Committee on Graduate Students #12; Robot Arm Control Exploiting Natural

  4. Nonperturbative dynamics of reheating after inflation: A review

    E-Print Network [OSTI]

    Amin, Mustafa A.

    Our understanding of the state of the universe between the end of inflation and big bang nucleosynthesis (BBN) is incomplete. The dynamics at the end of inflation are rich and a potential source of observational signatures. ...

  5. Measuring Greenland Glacier Dynamics with Remotely Sensed Data

    E-Print Network [OSTI]

    Foga, Steve

    2013-01-15T23:59:59.000Z

    Measuring Greenland Glacier Dynamics with Remotely Sensed Data Steve Foga University of Kansas, Geography M.A. Student Photo by: Phil Pasquini The importance of studying glacier ice Study area Difference in ice velocity of Helheim Glacier...

  6. SIMULATING MARKET TRANSFORMATION DYNAMICS USING A HYBRID ENERGY ECONOMY MODEL

    E-Print Network [OSTI]

    AT THE ADOPTION OF HYDROGEN FUEL CELL VEHICLES by Jimena Eyzaguirre M.Sc. Geology, University of Western Ontario, to develop policy-relevant information about dynamics in consumer preferences for hydrogen fuel cell vehicles

  7. Optimal approach to quantum communication using dynamic programming

    E-Print Network [OSTI]

    Nehorai, Arye

    Optimal approach to quantum communication using dynamic programming Liang Jiang* , Jacob M. Taylor*§ , Navin Khaneja¶ , and Mikhail D. Lukin* *Department of Physics, ¶School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138; and §Department of Physics, Massachusetts Institute

  8. Proc. 17th Winter Workshop on Nuclear Dynamics (2001) 000000

    E-Print Network [OSTI]

    2001-01-01T23:59:59.000Z

    Proc. 17th Winter Workshop on Nuclear Dynamics (2001) 000­000 17th Winter Workshop on Nuclear Strasbourg, France 4 Institute of Nuclear Physics, Krakow, Poland 5 Jagiellonian University, Krakow, Poland 6

  9. Multiscale Modeling of Process Dynamics and Microstructure Development...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    of Process Dynamics and Microstructure Development in Laser-based Keyhole Welding and Additive Manufacturing Jun 05 2015 10:00 AM - 11:00 AM Wenda Tan, University of Utah, Salt...

  10. Building Dynamic Computing Infrastructures over Distributed Clouds Pierre Riteau

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Building Dynamic Computing Infrastructures over Distributed Clouds Pierre Riteau University--The emergence of cloud computing infrastructures brings new ways to build and manage computing systems objectives. First, leveraging virtualization and cloud computing infrastruc- tures to build distributed large

  11. Disease Ecology: Community Structure and Pathogen Dynamics [Review

    E-Print Network [OSTI]

    Peterson, A. Townsend

    2007-01-01T23:59:59.000Z

    BOOKS & MEDIA Disease Ecology: Community Structure and Pathogen Dynamics Sharon K. Collinge and Chris Ray, editors Oxford University Press, Cary, North Carolina, 2006 ISBN: 0198567073 Pages: 227; Price: US $124.50 The disciplines of community...

  12. Recycling universe

    E-Print Network [OSTI]

    Jaume Garriga; Alexander Vilenkin

    1997-07-26T23:59:59.000Z

    If the effective cosmological constant is non-zero, our observable universe may enter a stage of exponential expansion. In such case, regions of it may tunnel back to the false vacuum of an inflaton scalar field, and inflation with a high expansion rate may resume in those regions. An ``ideal'' eternal observer would then witness an infinite succession of cycles from false vacuum to true, and back. Within each cycle, the entire history of a hot universe would be replayed. If there were several minima of the inflaton potential, our ideal observer would visit each one of these minima with a frequency which depends on the shape of the potential. We generalize the formalism of stochastic inflation to analyze the global structure of the universe when this `recycling' process is taken into account.

  13. University Partnerships

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over OurThe Iron SpinPrinceton Plasma Physics Lab UniqueFeet)UniversityUniversity

  14. An efficient method for treating uncertainties in structural dynamics

    E-Print Network [OSTI]

    Wang, Bing

    1992-01-01T23:59:59.000Z

    AN EFFICIENT METHOD FOR TREATING UNCERTAINTIES IN STRUCTURAL DYNAMICS A Thesis by BING WANG Submitted to the Oflice of Graduate Studies of Texas ASSAM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE...) Alan . Pa zolo (Member) ames . . Yao (Head of D artment) December 1992 ABSTRACT An Efficient Method for Treating Uncertainties in Structural Dynamics. (December 1992) Bing Wang, B. S. , Tsinghua University Chair of Advisory Committee: Dr...

  15. Fast dynamic force computation for electrostatic and electromagnetic conductors

    E-Print Network [OSTI]

    Koteeswaran, Prabhavathi

    2005-02-17T23:59:59.000Z

    FAST DYNAMIC FORCE COMPUTATION FOR ELECTROSTATIC AND ELECTROMAGNETIC CONDUCTORS AThesis by PRABHAVATHI KOTEESWARAN 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 2004 Major Subject: Computer Engineering FAST DYNAMIC FORCE COMPUTATION FOR ELECTROSTATIC AND ELECTROMAGNETIC CONDUCTORS AThesis by PRABHAVATHI KOTEESWARAN Submitted to Texas A&M University in partial fulfillment...

  16. Dust-shell Universe in the modified gravity scenario

    E-Print Network [OSTI]

    Michael Maziashvili

    2005-04-15T23:59:59.000Z

    The dynamics of the dust-shell model of universe is exactly solved for the modified Schwarzschild solution. This solution is used to derive the cosmology corresponding to the modified gravity.

  17. Preliminary results of a dynamic system model for a closed-loop Brayton cycle coupled to a nuclear reactor.

    SciTech Connect (OSTI)

    Wright, Steven Alan

    2003-06-01T23:59:59.000Z

    This paper describes preliminary results of a dynamic system model for a closed-loop Brayton-cycle that is coupled to a nuclear reactor. The current model assumes direct coupling between the reactor and the Brayton-cycle, however only minor additions are required to couple the Brayton-cycle through a heat exchanger to either a heat pipe reactor or a liquid metal cooled reactor. Few reactors have ever been coupled to closed Brayton-cycle systems. As such their behavior under dynamically varying loads, startup and shut down conditions, and requirements for safe and autonomous operation are largely unknown. Sandia National Laboratories has developed steady-state and dynamic models for closed-loop turbo-compressor systems (for space and terrestrial applications). These models are expected to provide a basic understanding of the dynamic behavior and stability of the coupled reactor and power generation loop. The model described in this paper is a lumped parameter model of the reactor, turbine, compressor, recuperator, radiator/waste-heat-rejection system and generator. More detailed models that remove the lumped parameter simplifications are also being developed but are not presented here. The initial results of the model indicate stable operation of the reactor-driven Brayton-cycle system and its ability to load-follow. However, the model also indicates some counter-intuitive behavior for the complete coupled system. This behavior will require the use of a reactor control system to select an appropriate reactor operating temperature that will optimize the performance of the complete spacecraft system. We expect this model and subsequent versions of it to provide crucial information in developing procedures for safe start up, shut down, safe-standby, and other autonomous operating modes. Ultimately, Sandia hopes to validate these models and to perform nuclear ground tests of reactor-driven closed Brayton-cycle systems in our nuclear research facilities.

  18. University Archives University of Missouri at Columbia

    E-Print Network [OSTI]

    Taylor, Jerry

    University Archives University of Missouri at Columbia 703 Lewis Hall Columbia, Missouri 65211 of Missouri at Columbia, may be loaned out to University personnel. All items on loan will be listed below on loan from the University Archives, University of Missouri at Columbia. He/She further acknowledges full

  19. University of Maryland University Health Center

    E-Print Network [OSTI]

    Milchberg, Howard

    special care is taken, should the extracts be lost or damaged, the University Health Center cannot assumeUniversity of Maryland University Health Center ALLERGY INJECTION POLICY The University Health to effectively use our service, we require your cooperation. INSTRUCTIONS Because the University Health Center

  20. UNIVERSITY SPACE POLICY ALLOCATION OF UNIVERSITY SPACE

    E-Print Network [OSTI]

    UNIVERSITY COLLEGE DUBLIN UNIVERSITY SPACE POLICY #12;ALLOCATION OF UNIVERSITY SPACE I Purpose To provide a methodology for the allocation of space across the University II Background Due to the university's success in attracting research funding, the need for space and facilities has grown

  1. An acoustic energy framework for predicting combustion- driven acoustic instabilities in premixed gas-turbines

    E-Print Network [OSTI]

    Ibrahim, Zuhair M. A.

    2007-01-01T23:59:59.000Z

    Swirl Vane Location on Combustion Dynamics," ASME Turbo-ExpoC.E. , " Passive Control of Combustion Instability in Lean2] Williams, F. A. , " Combustion Theory," Second ed. 1985,

  2. Cosmological dynamical systems

    E-Print Network [OSTI]

    Genly Leon; Carlos R. Fadragas

    2014-12-18T23:59:59.000Z

    In this book are studied, from the perspective of the dynamical systems, several Universe models. In chapter 1 we give a bird's eye view on cosmology and cosmological problems. Chapter 2 is devoted to a brief review on some results and useful tools from the qualitative theory of dynamical systems. They provide the theoretical basis for the qualitative study of concrete cosmological models. Chapters 1 and 2 are a review of well-known results. Chapters 3, 4, 5 and 6 are devoted to our main results. In these chapters are extended and settled in a substantially different, more strict mathematical language, several results obtained by one of us in arXiv:0812.1013 [gr-qc]; arXiv:1009.0689 [gr-qc]; arXiv:0904.1577[gr-qc]; and arXiv:0909.3571 [hep-th]. In chapter 6, we provide a different approach to the subject discussed in astro-ph/0503478. Additionally, we perform a Poincar\\'e compactification process allowing to construct a global phase space containing all the cosmological information in both finite and infinite regions for all the models.

  3. The shape dynamics description of gravity

    E-Print Network [OSTI]

    Tim Koslowski

    2015-01-13T23:59:59.000Z

    Classical gravity can be described as a relational dynamical system without ever appealing to spacetime or its geometry. This description is the so-called shape dynamics description of gravity. The existence of relational first principles from which the shape dynamics description of gravity can be derived is a motivation to consider shape dynamics (rather than GR) as the fundamental description of gravity. Adopting this point of view leads to the question: What is the role of spacetime in the shape dynamics description of gravity? This question contains many aspects: Compatibility of shape dynamics with the description of gravity in terms of spacetime geometry, the role of local Minkowski space, universality of spacetime geometry and the nature of quantum particles, which can no longer be assumed to be irreducible representations of the Poincare group. In this contribution I derive effective spacetime structures by considering how matter fluctuations evolve along with shape dynamics. This evolution reveals an "experienced spacetime geometry." This leads (in an idealized approximation) to local Minkowski space and causal relations. The small scale structure of the emergent geometric picture depends on the specific probes used to experience spacetime, which limits the applicability of effective spacetime to describe shape dynamics. I conclude with discussing the nature of quantum fluctuations (particles) in shape dynamics and how local Minkowski spacetime emerges from the evolution of quantum particles.

  4. Shape Dynamics in 2+1 Dimensions

    E-Print Network [OSTI]

    Timothy Budd; Tim Koslowski

    2011-07-07T23:59:59.000Z

    Shape Dynamics is a formulation of General Relativity where refoliation invariance is traded for local spatial conformal invariance. In this paper we explicitly construct Shape Dynamics for a torus universe in 2+1 dimensions through a linking gauge theory that ensures dynamical equivalence with General Relativity. The Hamiltonian we obtain is formally a reduced phase space Hamiltonian. The construction of the Shape Dynamics Hamiltonian on higher genus surfaces is not explicitly possible, but we give an explicit expansion of the Shape Dynamics Hamiltonian for large CMC volume. The fact that all local constraints are linear in momenta allows us to quantize these explicitly, and the quantization problem for Shape Dynamics turns out to be equivalent to reduced phase space quantization. We consider the large CMC-volume asymptotics of conformal transformations of the wave function. We then use the similarity of Shape Dynamics on the 2-torus with the explicitly constructible strong gravity (BKL) Shape Dynamics Hamiltonian in higher dimensions to suggest a quantization strategy for Shape Dynamics.

  5. Courses: Organization Development (OD) Page 371Sonoma State University 2013-2014 Catalog od 533C group dynAMiCS in orgAnizAtion deVeLopMent (1-3)

    E-Print Network [OSTI]

    Ravikumar, B.

    Courses: Organization Development (OD) Page 371Sonoma State University 2013-2014 Catalog od 533C Development program. (Two semesters.) od 544A QuALitAtiVe reSeArCH in orgAnizAtionS (1-3) This course in the Organization Development Program only. od 544B QuALitAtiVe reSeArCH in orgAnizAtion (1-3) This course

  6. Achieving Energy Conservation in Poisson-Boltzmann Molecular Dynamics

    E-Print Network [OSTI]

    Zhao, Hongkai

    1 Achieving Energy Conservation in Poisson-Boltzmann Molecular Dynamics: Accuracy and Precision University, Raleigh, NC 27695 Abstract Violation of energy conservation in Poisson-Boltzmann molecular is the observed violation of energy conservation in Poisson-Boltzmann molecular dynamics, in part due to its

  7. Concept Formation, Remembering, and Understanding: Dynamic Conceptual Semantics and

    E-Print Network [OSTI]

    Amsterdam, University of

    Recherche du Temps Perdu Renate Bartsch ILLC University of Amsterdam #12;i Preface This study presents Conceptual Semantics and of the Unconscious and Conscious, which has been developed in Bartsch 1998 Dynamic and in Bartsch 2002, Consciousness Emerging: The Dynamics of Perception, Imagination, Action, Memory, Thought

  8. Fractal and Chaotic Dynamics in Nervous Systems Chris C. King

    E-Print Network [OSTI]

    King, Chris

    Fractal and Chaotic Dynamics in Nervous Systems Chris C. King Department of Mathematics & Statistics, University of Auckland. Abstract : This paper presents a review of fractal and chaotic dynamics distributed processing models and their relation to chaos and overviews reasons why chaotic and fractal

  9. Femtosecond dynamics of Cu,,CD3OD... Jack Barbera

    E-Print Network [OSTI]

    Lineberger, W. Carl

    Femtosecond dynamics of Cu,,CD3OD... Jack Barbera JILA, University of Colorado, Boulder, Colorado online 27 February 2007 We report the femtosecond nuclear dynamics of Cu CD3OD van der Waals clusters, investigated using photodetachment-photoionization spectroscopy. Photodetachment of an electron from Cu- CD3OD

  10. The Web Changes Everything: Understanding the Dynamics of Web Content

    E-Print Network [OSTI]

    Bergstrom, Carl T.

    The Web Changes Everything: Understanding the Dynamics of Web Content Eytan Adar University, USA jelsas@cs.cmu.edu ABSTRACT The Web is a dynamic, ever changing collection of information. This paper explores changes in Web content by analyzing a crawl of 55,000 Web pages, selected to represent

  11. ML Reconstruction of Dynamic PET Images from Projections and Clist

    E-Print Network [OSTI]

    Zibulevsky, Michael

    ML Reconstruction of Dynamic PET Images from Projections and Clist Michael Zibulevsky Computer Science Department FEC 313 University of New Mexico Albuquerque, NM 87131 USA email: michael and w vc are non-negative dynamic parameters. Corresponding PET data y bt represents number of counts

  12. van der Waerden's Theorem and Topological Dynamics Proof Mining

    E-Print Network [OSTI]

    Gerhardy, Philipp

    Outline van der Waerden's Theorem and Topological Dynamics Proof Mining Proof Analysis Comparison with van der Waerden's proof Proof Mining in Topological Dynamics Philipp Gerhardy Department of Mathematics University of Oslo Oberwolfach, April 6 - April 12, 2008. Philipp Gerhardy Proof Mining

  13. Proof Mining in Ergodic Theory and Topological Dynamics

    E-Print Network [OSTI]

    Gerhardy, Philipp

    Proof Mining in Ergodic Theory and Topological Dynamics Philipp Gerhardy Department of Mathematics, University of Oslo Proof Mining in Ergodic Theory and Topological Dynamics ­ p.1/10 #12;Introduction "Proof mining" is the subfield of mathematical logic concerned with extracting additional information from

  14. Robustness of chimera states in complex dynamical systems

    E-Print Network [OSTI]

    Lai, Ying-Cheng

    Robustness of chimera states in complex dynamical systems Nan Yao1,2 , Zi-Gang Huang2,3 , Ying State University, Tempe, Arizona 85287, USA. The remarkable phenomenon of chimera state in systems distinct types of dynamical behaviors, in spite of identity of the oscillators. But how robust are chimera

  15. Transition state theory and dynamical corrections in ergodic systems

    E-Print Network [OSTI]

    Van Den Eijnden, Eric

    Transition state theory and dynamical corrections in ergodic systems Fabio A. Tal and Eric Vanden, New York University, New York, USA Abstract. The results of transition state theory are derived manifold. A new perspective on how to compute the dynamical corrections to the TST transition frequency

  16. U.S. farmland price dynamics: cause-effect relationships

    E-Print Network [OSTI]

    Davlasheridze, Meri

    2009-05-15T23:59:59.000Z

    U.S. FARMLAND PRICE DYNAMICS: CAUSE-EFFECT RELATIONSHIPS A Thesis by MERI DAVLASHERIDZE 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 August 2007 Major Subject: Agricultural Economics U.S. FARMLAND PRICE DYNAMICS: CAUSE-EFFECT RELATIONSHIPS A Thesis by MERI DAVLASHERIDZE Submitted...

  17. Dynamics of Bose-Einstein Condensates Benjamin Schlein

    E-Print Network [OSTI]

    Dynamics of Bose-Einstein Condensates Benjamin Schlein Department of Mathematics, University the dynamics of Bose-Einstein condensates, ob- tained in a series of joint papers [5, 6] with L. Erdos and H Schr¨odinger equation known as the Gross-Pitaevskii equation for the time evolution of the condensate

  18. Unsteady Flow Evolution and Combustion Dynamics of Homogeneous Solid Propellant in a Rocket Motor

    E-Print Network [OSTI]

    Apte, Sourabh V.

    Unsteady Flow Evolution and Combustion Dynamics of Homogeneous Solid Propellant in a Rocket Motor University, University Park, PA 16802, USA A time-resolved numerical analysis of combustion dynamics of double-base homogenous solid propellant in a rocket motor is performed by means of a Large

  19. UNIVERSITY OF ABERDEEN UNIVERSITY COURT

    E-Print Network [OSTI]

    Levi, Ran

    of catering and residential services. Any proposals on the future direction of the company would be received that there remained a considerable number of areas within the University that depended on the future success had been scrutinised by the Audit Committee, and forwarded by the Joint Planning Finance & Estates

  20. Online Calibration for Dynamic Traffic Constantinos Antoniou

    E-Print Network [OSTI]

    Bertini, Robert L.

    On­line Calibration for Dynamic Traffic Assignment Constantinos Antoniou October 5, 2007 Seminar­line DTA framework Demand simulator Supply simulator State estimation and model calibration Network calibration approaches include subset of these models Seminar at Portland State University 3 #12;Constantinos

  1. Dynamic Behavior of Multiple Inversions Senior Thesis

    E-Print Network [OSTI]

    Popovic, Jovan

    Dynamic Behavior of Multiple Inversions Ilya Baran Senior Thesis Boston University Academy Under functions. To iterate a function means to compose it with itself multiple times. Unless stated otherwise, we a circle centered at O with radius r is a point A 0 on the ray \\Gamma! OA such that OA r = r OA 0 (see

  2. Effective Evolution Equations from Quantum Dynamics

    E-Print Network [OSTI]

    Niels Benedikter; Marcello Porta; Benjamin Schlein

    2015-02-09T23:59:59.000Z

    In these notes we review the material presented at the summer school on "Mathematical Physics, Analysis and Stochastics" held at the University of Heidelberg in July 2014. We consider the time-evolution of quantum systems and in particular the rigorous derivation of effective equations approximating the many-body Schr\\"odinger dynamics in certain physically interesting regimes.

  3. PETER LEE OLSON Present Position: Professor of Geophysical Fluid Dynamics

    E-Print Network [OSTI]

    Olson, Peter L.

    Union, Tectonophysics Section Scientific Advisory Board, Maryland Power Plant Siting Program Scientific of California, Berkeley, California M.A. Geophysics, June 1974, University of California, Berkeley, California B of California, Berkeley (1980) Assistant Professor of Geophysical Fluid Dynamics, Johns Hopkins University

  4. Open University

    ScienceCinema (OSTI)

    None

    2011-04-25T23:59:59.000Z

    Michel Pentz est née en Afrique du Sud et venu au Cern en 1957 comme physicien et président de l'associaion du personnel. Il est également fondateur du mouvement Antiapartheid de Genève et a participé à la fondation de l'Open University en Grande-Bretagne. Il nous parle des contextes pédagogiques, culturels et nationaux dans lesquels la méthode peut s'appliquer.

  5. PHYSICAL REVIEW E 87, 052808 (2013) Controlling collective dynamics in complex minority-game resource-allocation systems

    E-Print Network [OSTI]

    Lai, Ying-Cheng

    2013-01-01T23:59:59.000Z

    730000, China 2 School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe in complex dynamical systems with significant applications to social, economical, and political systems. DOI

  6. EINDHOVEN UNIVERSITY OF TECHNOLOGY Department of Mathematics and Computer Science

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    EINDHOVEN UNIVERSITY OF TECHNOLOGY Department of Mathematics and Computer Science CASA-Report 14 and Applications Department of Mathematics and Computer Science Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven, The Netherlands ISSN: 0926-4507 #12;#12;Multiscale Modeling of Colloidal Dynamics

  7. Department of Mathematics University of Oslo

    E-Print Network [OSTI]

    Løw, Erik

    is suggested to Master and PhD students in the area of Stochastic Analysis, Insurance, and Risk as well. Dynamic risk measures Readings and associated literature [EFM] "Quantitative Risk Management", Embrechts PDepartment of Mathematics University of Oslo FINANCIAL RISK MEASURES Risk measures are set

  8. The only non-contradictory model of universe

    E-Print Network [OSTI]

    V. Skalsky

    2000-10-01T23:59:59.000Z

    The Friedmann equations of universe dynamics describe the infinite number of the Friedmannian models of universe. The consistent and distinguished relativistic, classical-mechanical, quantum-mechanical and formal-logical analysis of the Friedmannian universe models leads to a surprising and unexpected conclusion: The Friedmannian model of the flat expansive homogeneous and isotropic universe with the zero gravitational force state equation is the only model of universe, which does not contradict the: 1st Einstein general theory of relativity (and its special partial solutions: the Einstein special theory of relativity and the Newton theory of gravitation); 2nd quantum mechanics; 3rd fundamental formal principles of logical thinking; and 4th observations.

  9. Dynamics of f(x) = x + x-1 via Elliptic Curves

    E-Print Network [OSTI]

    Gao, Shuhong

    Dynamics of f(x) = x + x-1 via Elliptic Curves Jang-Woo Park Department of Mathematical Sciences University, Clemson, SC 29634-0975, USA Abstract Understanding the dynamics of nonlinear maps is an important but difficult problem, and there are not many methods available. In this paper, we study the dynamics

  10. Fluid Dynamics Research 33 (2003) 333356 Leapfrogging vortex rings: Hamiltonian structure, geometric

    E-Print Network [OSTI]

    Shashikanth, Banavara N.

    2003-01-01T23:59:59.000Z

    Fluid Dynamics Research 33 (2003) 333­356 Leapfrogging vortex rings: Hamiltonian structure that if the rings are modeled as coaxial circular ÿlaments, their dynamics and Hamil- tonian structure is derivable of Mechanical Engineering, New Mexico State University, Las Cruces, NM 88003, USA b Control and Dynamical

  11. The Microscopic Linear Dynamics

    E-Print Network [OSTI]

    Penny, Will

    The Microscopic Brain Will Penny Linear Dynamics Exponentials Matrix Exponential Eigendecomposition Dynamical Modes Nodes State Space Saddles Oscillations Spirals Centres Offsets Retinal Circuit Nullclines Stability Spiking Neurons Fitzhugh-Nagumo Nonlinear Dynamics Linearization Nonlinear Oscillation Excitable

  12. Dynamic T{sub 2}-mapping during magnetic resonance guided high intensity focused ultrasound ablation of bone marrow

    SciTech Connect (OSTI)

    Waspe, Adam C.; Looi, Thomas; Mougenot, Charles; Amaral, Joao; Temple, Michael; Sivaloganathan, Siv; Drake, James M. [Centre for Image Guided Innovation and Therapeutic Intervention, The Hospital for Sick Children, Toronto, ON, M5G 1X8 (Canada); Philips Healthcare Canada, Markham, ON, L6C 2S3 (Canada); Centre for Image Guided Innovation and Therapeutic Intervention, The Hospital for Sick Children, Toronto, ON, M5G 1X8 (Canada); Department of Applied Mathematics, University of Waterloo, Waterloo, ON, N2L 3G1 (Canada); Centre for Image Guided Innovation and Therapeutic Intervention, The Hospital for Sick Children, Toronto, ON, M5G 1X8 (Canada)

    2012-11-28T23:59:59.000Z

    Focal bone tumor treatments include amputation, limb-sparing surgical excision with bone reconstruction, and high-dose external-beam radiation therapy. Magnetic resonance guided high intensity focused ultrasound (MR-HIFU) is an effective non-invasive thermotherapy for palliative management of bone metastases pain. MR thermometry (MRT) measures the proton resonance frequency shift (PRFS) of water molecules and produces accurate (<1 Degree-Sign C) and dynamic (<5s) thermal maps in soft tissues. PRFS-MRT is ineffective in fatty tissues such as yellow bone marrow and, since accurate temperature measurements are required in the bone to ensure adequate thermal dose, MR-HIFU is not indicated for primary bone tumor treatments. Magnetic relaxation times are sensitive to lipid temperature and we hypothesize that bone marrow temperature can be determined accurately by measuring changes in T{sub 2}, since T{sub 2} increases linearly in fat during heating. T{sub 2}-mapping using dual echo times during a dynamic turbo spin-echo pulse sequence enabled rapid measurement of T{sub 2}. Calibration of T{sub 2}-based thermal maps involved heating the marrow in a bovine femur and simultaneously measuring T{sub 2} and temperature with a thermocouple. A positive T{sub 2} temperature dependence in bone marrow of 20 ms/ Degree-Sign C was observed. Dynamic T{sub 2}-mapping should enable accurate temperature monitoring during MR-HIFU treatment of bone marrow and shows promise for improving the safety and reducing the invasiveness of pediatric bone tumor treatments.

  13. A Relativistic Dynamical Collapse Model

    E-Print Network [OSTI]

    Philip Pearle

    2014-12-21T23:59:59.000Z

    A model is discussed where all operators are constructed from a quantum scalar field whose energy spectrum takes on all real values. The Schr\\"odinger picture wave function depends upon space and time coordinates for each particle, as well as an inexorably increasing evolution parameter $s$ which labels a foliation of space-like hypersurfaces. The model is constructed to be manifestly Lorentz invariant in the interaction picture. Free particle states and interactions are discussed in this framework. Then, the formalism of the CSL (Continuous Spontaneous Localization) theory of dynamical collapse is applied. The collapse-generating operator is chosen to to be the particle number space-time density. Unlike previous relativistically invariant models, the vacuum state is not excited. The collapse dynamics depends upon two parameters, a parameter $\\Lambda$ which represents the collapse rate/volume and a scale factor $\\ell$. A common example of collapse dynamics, involving a clump of matter in a superposition of two locations, is analyzed. The collapse rate is shown to be identical to that of non-relativistic CSL when the GRW-CSL choice of $\\ell=a=10^{-5}$cm, is made, along with $\\Lambda=\\lambda/a^{3}$ (GRW-CSL choice $\\lambda=10^{-16}s^{-1}$). However, it is also shown that the change of mass of a nucleon over the age of the universe is then unacceptably large. The case where $\\ell$ is the size of the universe is then considered. It is shown that the collapse behavior is satisfactory and the change of mass over the age of the universe is acceptably small, when $\\Lambda= \\lambda/\\ell a^{2}$.

  14. Water Dynamics at Rough Interfaces

    E-Print Network [OSTI]

    Markus Rosenstihl; Kerstin Kämpf; Felix Klameth; Matthias Sattig; Michael Vogel

    2014-07-21T23:59:59.000Z

    We use molecular dynamics computer simulations and nuclear magnetic resonance experiments to investigate the dynamics of water at interfaces of molecular roughness and low mobility. We find that, when approaching such interfaces, the structural relaxation of water, i.e., the $\\alpha$ process, slows down even when specific attractive interactions are absent. This prominent effect is accompanied by a smooth transition from Vogel to Arrhenius temperature dependence and by a growing importance of jump events. Consistently, at protein surfaces, deviations from Arrhenius behavior are weak when free water does not exist. Furthermore, in nanoporous silica, a dynamic crossover of liquid water occurs when a fraction of solid water forms near 225 K and, hence, the liquid dynamics changes from bulk-like to interface-dominated. At sufficiently low temperatures, water exhibits a quasi-universal $\\beta$ process, which is characterized by an activation energy of $E_a\\!=\\!0.5$ eV and involves anisotropic reorientation about large angles. As a consequence of its large amplitude, the faster $\\beta$ process destroys essentially all orientational correlation, rendering observation of a possible slower $\\alpha$ process difficult in standard experiments. Nevertheless, we find indications for the existence of structural relaxation down to a glass transition of interfacial water near 185 K. Hydrated proteins show a highly restricted backbone motion with an amplitude, which decreases upon cooling and vanishes at comparable temperatures, providing evidence for a high relevance of water rearrangements in the hydration shell for secondary protein relaxations.

  15. University Profile The University of Canterbury

    E-Print Network [OSTI]

    Hickman, Mark

    05 University Profile 2005-2007 #12;The University of Canterbury Te Whare Wnanga o Waitaha PROFILE Profile 2005-2007 Page 1 of 66 #12;University of Canterbury Profile 2005-2007 Page 2 of 66 #12;University of Canterbury PROFILE 2005-2007 Part A Overview of Strategic Direction and relationship to the Tertiary

  16. University Library AMSTERDAM UNIVERSITY LIBRARY USER REGULATIONS

    E-Print Network [OSTI]

    van Rooij, Robert

    University Library AMSTERDAM UNIVERSITY LIBRARY USER REGULATIONS Regulations for the users of the libraries of the University of Amsterdam General 1. The Amsterdam University Library (from hereon: the library) is understood to mean the whole body of faculty libraries and facilities of the Library

  17. Protein Dynamics and Biocatalysis

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Protein Dynamics and Biocatalysis Protein Dynamics and Biocatalysis 1998 Annual Report Grand Challenge Projects biocatalysis.gif A model of the Michaelis complex for the TEM-1...

  18. Universality in short-time critical gluodynamics with heat-bath-inspired algorithms

    E-Print Network [OSTI]

    Rafael B. Frigori

    2010-04-14T23:59:59.000Z

    Short-time dynamics technique is used to study the relaxation process for the (2+1)-dimensional critical gluodynamics of the SU(2) lattice gauge theory. A generalized class of heat-bath-inspired updating algorithms was employed during the short-time regime of the dynamic evolution for performance comparison. The static and dynamic critical exponents of the theory were measured, serving as a dynamic benchmark for algorithmic efficiency. Our results are in agreement with predictions from universality hypothesis and suggest that there is an underlying universal dynamics shared by the analyzed algorithms.

  19. Hydrogen Molecules inside Fullerene C70: Quantum Dynamics, Energetics, Maximum Occupancy, And Comparison with C60

    E-Print Network [OSTI]

    Turro, Nicholas J.

    Hydrogen Molecules inside Fullerene C70: Quantum Dynamics, Energetics, Maximum Occupancy of Chemistry, New York UniVersity, New York, New York 10003, Department of Chemistry, Brown UniVersity, ProVidence, Rhode Island 02912, and Department of Chemistry, Columbia UniVersity, New York, New York 10027 Received

  20. Outline Phonon spectra of graphene Raman spectra of graphene Crystal lattice dynamics

    E-Print Network [OSTI]

    Seminar Heng Wang University of Konstanz July 11, 2013 Heng Wang University of Konstanz () Crystal lattice Raman spectra of graphene What is Raman scattering Applications of Raman spectroscopy of graphene Heng (2013). Heng Wang University of Konstanz () Crystal lattice dynamics July 11, 2013 3 / 19 #12;Outline

  1. A Diffusion Model in Population Genetics with Mutation and Dynamic Fitness

    E-Print Network [OSTI]

    O'Leary, Michael

    A Diffusion Model in Population Genetics with Mutation and Dynamic Fitness Mike O'Leary Department of Mathematics Towson University World Conference on Nonlinear Analysis Orlando, FL July 2008 Mike O'Leary of this work are joint with Judith Miller, Georgetown University. Mike O'Leary (Towson University) A Diffusion

  2. Proceedings of ASME TURBO EXPO 2003 2003 ASME TURBO EXPO 2003 Land, Sea and Air

    E-Print Network [OSTI]

    Kim, Sangho

    computation currently underway Combustor (LES) Turbine (RANS)Compressor (RANS) interface interface Figure 1. FLOW COMPUTATIONS IN A GAS TURBINE: COMPRES- SOR ANS TURBINE [1] WITH RANS, COMBUSTOR WITH LES [2]. SO, the combustor, or the turbine. The optimization the entire system eludes currently CFD due to the high computa

  3. Participating Colleges & Universities (2008--2010)

    E-Print Network [OSTI]

    Participating Colleges & Universities (2008--2010) Bowling Green State University Capital University Capital University (Center for Lifelong Learning) DeVry University Fairmount State University Franklin University Heidelberg University Indiana Wesleyan University Kent State University (College

  4. IGCC Dynamic Simulator and Training Center

    SciTech Connect (OSTI)

    Zitney, S.E.; Erbes, M.R. (Enginomix, LLC)

    2006-10-01T23:59:59.000Z

    Integrated Gasification Combined Cycle (IGCC) is emerging as the technology of choice for providing clean, low-cost electricity for the next generation of coal-fired power plants and will play a central role in the development of high-efficiency, zero-emissions power plants such as FutureGen. Several major utilities and developers recently announced plans to build IGCC plants and other major utilities are evaluating IGCC’s suitability for base-load capacity additions. This recent surge of attention to IGCC power generation is creating a growing demand for experience with the analysis, operation, and control of commercial-scale IGCC plants. To meet this need, the National Energy Technology Laboratory (NETL) has launched a project to develop a generic, full-scope, IGCC dynamic plant simulator for use in establishing a state-of-the-art simulator training center at West Virginia University’s (WVU) National Research Center for Coal and Energy (NRCCE). The IGCC Dynamic Simulator & Training (DS&T) Center will be established under the auspices of the Collaboratory for Process & Dynamic Systems Modeling (“Collaboratory”) organized between NETL, WVU, the University of Pittsburgh, and Carnegie Mellon University.

  5. university-logo Stability of large-amplitude viscous shock profiles

    E-Print Network [OSTI]

    Zumbrun, Kevin

    university-logo Stability of large-amplitude viscous shock profiles in gas dynamics, MHD-0801745 Paris XIII, June 2010 Zumbrun Stability of viscous shock profiles #12;university-logo I shock profiles #12;university-logo Entropy and symmetrizability Typically associated to ut + f (u

  6. Emerging universe from scale invariance

    SciTech Connect (OSTI)

    Del Campo, Sergio; Herrera, Ramón [Instituto de Física, Pontificia Universidad Católica de Valparaíso, Avenida Brasil 2950, Casilla 4059, Valparaíso (Chile); Guendelman, Eduardo I. [Physics Department, Ben Gurion University of the Negev, Beer Sheva 84105 (Israel); Labraña, Pedro, E-mail: sdelcamp@ucv.cl, E-mail: guendel@bgu.ac.il, E-mail: ramon.herrera@ucv.cl, E-mail: plabrana@ubiobio.cl [Departamento de Física, Universidad del Bío Bío, Avenida Collao 1202, Casilla 5-C, Concepción (Chile)

    2010-06-01T23:59:59.000Z

    We consider a scale invariant model which includes a R{sup 2} term in action and show that a stable ''emerging universe'' scenario is possible. The model belongs to the general class of theories, where an integration measure independent of the metric is introduced. To implement scale invariance (S.I.), a dilaton field is introduced. The integration of the equations of motion associated with the new measure gives rise to the spontaneous symmetry breaking (S.S.B) of S.I. After S.S.B. of S.I. in the model with the R{sup 2} term (and first order formalism applied), it is found that a non trivial potential for the dilaton is generated. The dynamics of the scalar field becomes non linear and these non linearities are instrumental in the stability of some of the emerging universe solutions, which exists for a parameter range of the theory.

  7. Dynamics of Motivations

    E-Print Network [OSTI]

    Knoll, Jörn

    Dynamics of Resonances GSI, 18.05.2005 Motivations Thermal Equilibrium -N- vectormesons Di-leptons Towards dynamics Conserving -functional Gradient ap- proximation Quantum Kinetic Equation Summary Dynamics. Voskresensky1,3 1GSI 2Kurchatov Inst. (Moscow) 3Moscow Ins. for Physics and Engineering #12;Dynamics

  8. Dynamics on Lorentz manifolds

    E-Print Network [OSTI]

    Zeghib, Abdelghani

    Dynamics on Lorentz manifolds Abdelghani Zeghib Introduction Motivations and questions Examples Results Results Previous results Linear Dynamics General considerations Furstenberg Lemma Lorentz Dynamics://www.umpa.ens-lyon.fr/~zeghib/ (joint work with Paolo Piccione) #12;Dynamics on Lorentz manifolds Abdelghani Zeghib Introduction

  9. Introduction Basic dynamics

    E-Print Network [OSTI]

    LaCasce, Joseph H.

    Introduction Basic dynamics The Gulf Stream The thermohaline circulation Ocean currents: some misconceptions and some dynamics Joe LaCasce Dept. Geosciences October 30, 2012 Joe LaCasce Dept. Geosciences Ocean currents: some misconceptions and some dynamics #12;Introduction Basic dynamics The Gulf Stream

  10. DIMACS Center Rutgers University

    E-Print Network [OSTI]

    , Johns Hopkins University Andrew Patrick, NRC Canada Norman Sadeh, Carnegie Mellon University Other Cranor, AT&T Mark Ackerman, University of Michigan Fabian Monrose, Johns Hopkins University Andrew Patrick, NRC Canada Norman Sadeh, Carnegie Mellon University Working Group: Usable Privacy and Security

  11. University Libraries Technology Plan

    E-Print Network [OSTI]

    Moore, Paul A.

    Libraries Bowling Green State University #12;Table of Contents Introduction ..................................................................19 Page 2 of 19 Technology Plan, 2003-2005 University Libraries Bowling Green State University #12University Libraries Technology Plan 2003-2005 Page 1 of 19 Technology Plan, 2003-2005 University

  12. Collective motion in a Hamiltonian dynamical system

    E-Print Network [OSTI]

    Hidetoshi Morita; Kunihiko Kaneko

    2005-06-11T23:59:59.000Z

    Oscillation of macroscopic variables is discovered in a metastable state in the Hamiltonian dynamical system of mean field XY model, the duration of which is divergent with the system size. This long-lasting periodic or quasiperiodic collective motion appears through Hopf bifurcation, which is a typical route in low-dimensional dissipative dynamical systems. The origin of the oscillation is explained, with self-consistent analysis of the distribution function, as the emergence of self-excited ``swings'' through the mean-field. The universality of the phenomena is also discussed.

  13. Fractal dynamics of earthquakes

    SciTech Connect (OSTI)

    Bak, P.; Chen, K. [Brookhaven National Lab., Upton, NY (United States). Dept. of Physics

    1995-05-01T23:59:59.000Z

    Many objects in nature, from mountain landscapes to electrical breakdown and turbulence, have a self-similar fractal spatial structure. It seems obvious that to understand the origin of self-similar structures, one must understand the nature of the dynamical processes that created them: temporal and spatial properties must necessarily be completely interwoven. This is particularly true for earthquakes, which have a variety of fractal aspects. The distribution of energy released during earthquakes is given by the Gutenberg-Richter power law. The distribution of epicenters appears to be fractal with dimension D {approx} 1--1.3. The number of after shocks decay as a function of time according to the Omori power law. There have been several attempts to explain the Gutenberg-Richter law by starting from a fractal distribution of faults or stresses. But this is a hen-and-egg approach: to explain the Gutenberg-Richter law, one assumes the existence of another power-law--the fractal distribution. The authors present results of a simple stick slip model of earthquakes, which evolves to a self-organized critical state. Emphasis is on demonstrating that empirical power laws for earthquakes indicate that the Earth`s crust is at the critical state, with no typical time, space, or energy scale. Of course the model is tremendously oversimplified; however in analogy with equilibrium phenomena they do not expect criticality to depend on details of the model (universality).

  14. Brunel Link 2011 | 1 The Brunel University Alumni AssociationThe Brunel University Alumni Association

    E-Print Network [OSTI]

    Martin, Ralph R.

    )1895 267775 #12;The last 12 months have been some of the most packed and most fluid that I have experienced higher education. I also believe that the situation for universities remains fluid and dynamic, so, whose study on dampening the noise of dentist's drills will help patients overcome their fear

  15. University Services Pamela Wheelock

    E-Print Network [OSTI]

    Amin, S. Massoud

    University Services Pamela Wheelock Vice President MANAGEMENT SYSTEMS University Services Human Resources Linda Bjornberg Director open position CIO OPERATIONS Auxiliary Services Laurie Scheich Berthelsen Associate VP Public Safety Gregory Hestness Assistant VP University Health & Safety Craig Moody

  16. university-logo Introduction

    E-Print Network [OSTI]

    Johnson, Raymond L.

    university-logo Introduction Spatial Prediction Bayesian Spatial Prediction: BTG Benjamin Kedem Prediction: BTG #12;university-logo Introduction Spatial Prediction Stationary isotropic Gaussian random Kriging BTG Benjamin Kedem Bayesian Spatial Prediction: BTG #12;university-logo Introduction Spatial

  17. University Partners Panel

    Broader source: Energy.gov [DOE]

    Matt Tirrell, Pritzker Director and Professor, Institute for Molecular Engineering, University of Chicago Thomas Glasmacher, Facility for Rare Isotope Beams (FRIB) Project Manager, Michigan State University

  18. Birth of the Universe from the Multiverse

    E-Print Network [OSTI]

    Laura Mersini-Houghton

    2008-09-22T23:59:59.000Z

    It is fair to say that the deepest mystery in our understanding of nature is the birth of our universe. Much of the dilemma over the last decades comes from the extraordinarily small probability that the universe started with the high energy Big Bang as compared to the chance of nucleating any other event. How can Big Bang cosmology be $10^{10^{123}}$ times less likely than nucleating the present cold universe, while accumulating such exquisite agreement with astrophysical data? Why don't we see the other nucleations that, if left to chance, seem to overwhelmingly outnumber us? Here I discuss the point of view that the selection of the initial conditions can be meaningfully addressed only within the framework of the multiverse and that the reason why Big Bang inflation was preferred over other events lies in the quantum dynamics of the landscape of the initial patches. The out-of-equilibrium dynamics selected the 'survivor' universes be born at high energies and the 'terminal' universes at low energies. I briefly review the testable predictions of this theory, in particular the giant void observed in 2007. The second part focuses on the extended framework, in particular a set of postulates needed for defining the multiverse.

  19. Viscous dark fluid universe

    SciTech Connect (OSTI)

    Hipolito-Ricaldi, W. S. [Universidade Federal do Espirito Santo, Departamento de Ciencias Matematicas e Naturais, CEUNES, Rodovia BR 101 Norte, km. 60, CEP 29932-540, Sao Mateus, Espirito Santo (Brazil); Velten, H. E. S.; Zimdahl, W. [Universidade Federal do Espirito Santo, Departamento de Fisica, Av. Fernando Ferrari, 514, Campus de Goiabeiras, CEP 29075-910, Vitoria, Espirito Santo (Brazil)

    2010-09-15T23:59:59.000Z

    We investigate the cosmological perturbation dynamics for a universe consisting of pressureless baryonic matter and a viscous fluid, the latter representing a unified model of the dark sector. In the homogeneous and isotropic background the total energy density of this mixture behaves as a generalized Chaplygin gas. The perturbations of this energy density are intrinsically nonadiabatic and source relative entropy perturbations. The resulting baryonic matter power spectrum is shown to be compatible with the 2dFGRS and SDSS (DR7) data. A joint statistical analysis, using also Hubble-function and supernovae Ia data, shows that, different from other studies, there exists a maximum in the probability distribution for a negative present value q{sub 0{approx_equal}}-0.53 of the deceleration parameter. Moreover, while previous descriptions on the basis of generalized Chaplygin-gas models were incompatible with the matter power-spectrum data since they required a much too large amount of pressureless matter, the unified model presented here favors a matter content that is of the order of the baryonic matter abundance suggested by big-bang nucleosynthesis.

  20. Quantum Statistical Processes in the Early Universe

    E-Print Network [OSTI]

    B. L. Hu

    1993-02-22T23:59:59.000Z

    We show how the concept of quantum open system and the methods in non-equilibrium statistical mechanics can be usefully applied to studies of quantum statistical processes in the early universe. We first sketch how noise, fluctuation, dissipation and decoherence processes arise in a wide range of cosmological problems. We then focus on the origin and nature of noise in quantum fields and spacetime dynamics. We introduce the concept of geometrodynamic noise and suggest a statistical mechanical definition of gravitational entropy. We end with a brief discussion of the theoretical appropriateness to view the physical universe as an open system.

  1. Tariffs with Dynamic Supply Response

    E-Print Network [OSTI]

    Karp, Larry

    1985-01-01T23:59:59.000Z

    Giannini FDN iibrary TARIFFS WITH DYNAMIC SUPPLY RESWNSEpaper studies the optimal tariff in a dynamic framework. Thesellers, the optimal tariff is dynam- ically inconsistent;

  2. ARIZONA STATE UNIVERSITY STETSON UNIVERSITY Phoenix, AZ Deland, FL

    E-Print Network [OSTI]

    Wu, Shin-Tson

    English Literature English BOWLING GREEN STATE UNIVERSITY Bowling Green, OH SYRACUSE UNIVERSITY IndustrialARIZONA STATE UNIVERSITY STETSON UNIVERSITY Phoenix, AZ Deland, FL Interdisciplinary Studies Leadership FLORIDA STATE UNIVERSITY Instructional Systems Design Tallahassee, FL Interdisciplinary Studies

  3. Dynamics of structural priming 

    E-Print Network [OSTI]

    Malhotra, Gaurav

    2009-01-01T23:59:59.000Z

    for understanding various aspects of syntactic priming. Cognitive processes are modelled as dynamical systems that can change their behaviour when they process information. We use these dynamical systems to investigate how each episode of language comprehension...

  4. Graduate Programs Auburn University

    E-Print Network [OSTI]

    Forestry Graduate Programs Auburn University Auburn University, Alabama 368495414 Programs://www.forestry.auburn.edu/graduate/ University of California, Berkeley Berkeley, California 947203114 Program: Forestry http://espm.berkeley.edu/gradprograms/grad_programs_mf.html Clemson University Clemson, South Carolina 29634 Program: Forest Resources http

  5. Columbia University Postdoctoral Officers

    E-Print Network [OSTI]

    Grishok, Alla

    Columbia University Postdoctoral Officers Handbook 2013 #12;Greetings! I am excited to welcome you to the Columbia University community of scholars and investigators. The Columbia University Office of Postdoctoral Director, Office of Postdoctoral Affairs Columbia University in the city of new york office of postdoctoral

  6. Columbia University Postdoctoral Officers

    E-Print Network [OSTI]

    Grishok, Alla

    Columbia University Postdoctoral Officers Handbook 2011 #12;Greetings! I am excited to welcome you to the Columbia University community of scholars and investigators. The Columbia University Office of Postdoctoral of Postdoctoral Affairs Columbia university in the City of new york offiCe of postdoCtoral affairs 840 Interchurch

  7. Renewing University Base Funding

    E-Print Network [OSTI]

    Renewing University Base Funding The Priority Issues 29 February 2012 e conor funding to universities as an immediate goal. It has already put in place increases worth 3.5%. 2 undergraduate or postgraduate, be funded at the same rate. #12;3 Charles Darwin University Flinders University

  8. PHILADELPHIA UNIVERSITY 1995

    E-Print Network [OSTI]

    of polycyclic aromatic hydrocarbons (PAHs) in King Talal Water Dam in Jordan) . #12;PHILADELPHIA UNIVERSITY

  9. Residential Learning University Housing

    E-Print Network [OSTI]

    Rusu, Adrian

    Residential Learning & University Housing Handbook 2008 - 2009 A Guide for Residential Living on the Campus of Rowan University #12;Welcome to Residential Learning & University Housing! The primary purpose of the Office of Residential Life & University Housing is to assist and support students in the pursuit

  10. Categorical Introduction to Dynamical Systems Symbolic Dynamical Systems

    E-Print Network [OSTI]

    Kahng, Byung-Jay

    Categorical Introduction to Dynamical Systems Symbolic Dynamical Systems Symbolic Embedding Examples Results Embeddings in Symbolic Dynamical Systems Jonathan Jaquette Swarthmore College July 22, 2009 Jonathan Jaquette Embeddings in Symbolic Dynamical Systems #12;Categorical Introduction

  11. Dynamics and instability of false vacuum bubbles

    E-Print Network [OSTI]

    Anthony Aguirre; Matthew C. Johnson

    2005-11-22T23:59:59.000Z

    This paper examines the classical dynamics of false vacuum regions embedded in surrounding regions of true vacuum, in the thin-wall limit. The dynamics of all generally relativistically allowed solutions -- most but not all of which have been previously studied -- are derived, enumerated, and interpreted. We comment on the relation of these solutions to possible mechanisms whereby inflating regions may be spawned from non-inflating ones. We then calculate the dynamics of first order deviations from spherical symmetry, finding that many solutions are unstable to such aspherical perturbations. The parameter space in which the perturbations on bound solutions inevitably become nonlinear is mapped. This instability has consequences for the Farhi-Guth-Guven mechanism for baby universe production via quantum tunneling.

  12. Dynamics and instability of false vacuum bubbles

    SciTech Connect (OSTI)

    Aguirre, Anthony; Johnson, Matthew C. [Department of Physics, University of California, Santa Cruz, California 95064 (United States)

    2005-11-15T23:59:59.000Z

    This paper examines the classical dynamics of false-vacuum regions embedded in surrounding regions of true vacuum, in the thin-wall limit. The dynamics of all generally relativistically allowed solutions--most but not all of which have been previously studied--are derived, enumerated, and interpreted. We comment on the relation of these solutions to possible mechanisms whereby inflating regions may be spawned from noninflating ones. We then calculate the dynamics of first-order deviations from spherical symmetry, finding that many solutions are unstable to such aspherical perturbations. The parameter space in which the perturbations on bound solutions inevitably become nonlinear is mapped. This instability has consequences for the Farhi-Guth-Guven mechanism for baby universe production via quantum tunneling.

  13. Dynamics of Carroll Particles

    E-Print Network [OSTI]

    Eric Bergshoeff; Joaquim Gomis; Giorgio Longhi

    2014-05-31T23:59:59.000Z

    We investigate particles whose dynamics is invariant under the Carroll group. Although a single free such Carroll particle has no non-trivial dynamics (`the Carroll particle does not move') we show that there exists non-trivial dynamics for a set of interacting Carroll particles. Furthermore, we gauge the Carroll algebra and couple the Carroll particle to these gauge fields. It turns out that for such a coupled system even a single Carroll particle can have non-trivial dynamics.

  14. Nonlinear viscoelastic characterization of thin films using dynamic mechanical analysis

    E-Print Network [OSTI]

    Payne, Debbie Flowers

    1993-01-01T23:59:59.000Z

    NONLINEAR VISCOELASTIC CHARACTERIZATION OF THIN FILMS USING DYNAMIC MECHANICAL ANALYSIS A Thesis by DEBBIE FLOWERS PAYNE 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 AUGUST 1993 Major Subject: Aerospace Engineering NONLINEAR VISCOELASTIC CHARACTERIZATION OF THIN FILMS USING DYNAMIC MECHANICAL ANALYSIS A Thesis by DEBBIE FLOWERS PAYNE Approved as to style and content by: Thomas W...

  15. Dynamics of empty homogeneous isotropic three-dimensional spaces

    E-Print Network [OSTI]

    A. V. Klimenko; V. A. Klimenko

    2012-02-28T23:59:59.000Z

    It is shown that there are seven types of solutions described in the framework of general relativity theory (GRT), the dynamics of empty homogeneous isotropic three-dimensional spaces. Solution of the equations of GRT, which describes the dynamics of a homogeneous isotropic universe, in the limiting case of vanishingly small effect of matter on the metric properties of space must go to one of them.

  16. Modified Newtonian Dynamics as an extra dimensional effect

    E-Print Network [OSTI]

    W. F. Kao

    2006-03-13T23:59:59.000Z

    Modified Newtonian dynamics can be considered as an effect derived from a squeezable extra dimension space. The third law of Newtonian dynamics can be managed to remain valid in the 5-space. The critical acceleration parameter $a_0$ appears naturally as the bulk acceleration that has to do with the expanding universe in this setup. A simple toy model is presented in this Letter to show that consistent theory can be built with the help of the extra dimensional space.

  17. Analysis of azimuthal mode dynamics of mesoscale eddies

    E-Print Network [OSTI]

    McCalpin, John David

    1984-01-01T23:59:59.000Z

    ANALYSIS OF AZIMUTHAL MODE DYNAMICS OF MESOSCALE EDDIES A Thesis by UOHN DAVID MCCALPIN Submitted to the Graduate College of Texas ASM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August 1984... Major Subject: Oceanography ANALYSIS OF AZIMUTHAL MODE DYNAMICS OF MESOSCALE EDDIES A Thesis by JOHN DAVID MCCALPIN Approved as to style and content by: rew . as ano (Chairman of Committee) o ert . ei (Member) uy . rancesc &ni (Member) Robert...

  18. Experiments concerning the dynamic filtration of drilling mud

    E-Print Network [OSTI]

    Eller, John Gary

    1989-01-01T23:59:59.000Z

    EXPERIMENTS CONCERNING THE DYNAMIC FILTRATION OF DRILLING MUD A Thesis by JOHN GARY ELLER 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 May... 1989 Major Subject: Petroleum Engineering EXPERIMENTS CONCERNING THE DYNAMIC FILTRATION OF DRILLING MUD A Thesis by JOHN GARY ELLER Approved as to style and content by: Hans C. Ju am-Wold (Chair of Committee) tephen A. Holditch (Member) Ted...

  19. Atmospheric Dynamics II Instructor

    E-Print Network [OSTI]

    AT602 Atmospheric Dynamics II 2 credits Instructor: David W. J. Thompson davet: An Introduction to Dynamic Meteorology, 5th Edition, Academic Press (recommended) · Marshall, J., and Plumb, R. A., 2008: Atmosphere, Ocean, and Climate Dynamics: An Introductory Text, Academic Press. · Vallis, G. K

  20. Intramolecular and nonlinear dynamics

    SciTech Connect (OSTI)

    Davis, M.J. [Argonne National Laboratory, IL (United States)

    1993-12-01T23:59:59.000Z

    Research in this program focuses on three interconnected areas. The first involves the study of intramolecular dynamics, particularly of highly excited systems. The second area involves the use of nonlinear dynamics as a tool for the study of molecular dynamics and complex kinetics. The third area is the study of the classical/quantum correspondence for highly excited systems, particularly systems exhibiting classical chaos.

  1. 17. METAPOPULATION DYNAMICS OF

    E-Print Network [OSTI]

    17. METAPOPULATION DYNAMICS OF INFECTIOUS DISEASES Matt J. Keeling, Ottar N. Bjørnstad, and Bryan T resonances for the dynamics of parasites. This is particularly true for microparasitic infections" growth of the parasite population. Thus, at the scale of the host popu- lation, infectious dynamics bears

  2. Slow dynamics and anomalous nonlinear fast dynamics in diverse solids

    E-Print Network [OSTI]

    Slow dynamics and anomalous nonlinear fast dynamics in diverse solids Paul Johnsona) Geophysics study of anomalous nonlinear fast dynamics and slow dynamics in a number of solids. Observations are presented from seven diverse materials showing that anomalous nonlinear fast dynamics ANFD and slow dynamics

  3. Dynamics of false-vacuum bubbles

    SciTech Connect (OSTI)

    Blau, S.K.; Guendelman, E.I.; Guth, A.H.

    1987-03-15T23:59:59.000Z

    The possibility of localized inflation is investigated by calculating the dynamics of a spherically symmetric region of false vacuum which is separated by a domain wall from an infinite region of true vacuum. For a range of initial conditions, the false-vacuum region will undergo inflation. An observer in the exterior true-vacuum region will describe the system as a black hole, while an observer in the interior will describe a closed universe which completely disconnects from the original spacetime. We suggest that this mechanism is likely to lead to an instability of Minkowski space: a region of space might undergo a quantum fluctuation into the false-vacuum state, evolving into an isolated closed universe; the black hole which remains in the original space would disappear by quantum evaporation. The formation of these isolated closed universes may also be relevant to the question of information loss in black-hole formation.

  4. Methyl jasmonate elicits rapid changes in carbon and nitrogen dynamics in tomato

    E-Print Network [OSTI]

    Orians, Colin

    Methyl jasmonate elicits rapid changes in carbon and nitrogen dynamics in tomato Sara Go´mez1 of Biological Sciences, University of Rhode Island, Kingston, RI, USA Author for correspondence: Sara Go´mez Tel

  5. Dynamic Joint Action Perception for Q-Learning Agents Nancy Fulda and Dan Ventura

    E-Print Network [OSTI]

    Martinez, Tony R.

    Dynamic Joint Action Perception for Q-Learning Agents Nancy Fulda and Dan Ventura owens@cs.byu.edu, ventura@cs.byu.edu Department of Computer Science Brigham Young University April 18, 2003 Abstract Q

  6. Dynamic Sociometry in Particle Swarm Optimization Mark Richards and Dan Ventura

    E-Print Network [OSTI]

    Martinez, Tony R.

    Dynamic Sociometry in Particle Swarm Optimization Mark Richards and Dan Ventura Computer Science Department Brigham Young University {mdr,ventura}@cs.byu.edu Abstract. The performance of Particle Swarm

  7. Complex Dynamics of Autonomous Communication Networks and the Intelligent Communication Paradigm

    E-Print Network [OSTI]

    Andrei P. Kirilyuk

    2006-03-16T23:59:59.000Z

    Dynamics of arbitrary communication system is analysed as unreduced interaction process. The applied generalised, universally nonperturbative method of effective potential reveals the phenomenon of dynamic multivaluedness of competing system configurations forced to permanently replace each other in a causally random order, which leads to universally defined dynamical chaos, complexity, fractality, self-organisation, and adaptability (physics/9806002, physics/0211071, physics/0405063). We demonstrate the origin of huge, exponentially high efficiency of the unreduced, complex network dynamics and specify the universal symmetry of complexity (physics/0404006) as the fundamental guiding principle for creation and control of such qualitatively new kind of networks and devices. The emerging intelligent communication paradigm and its practical realisation in the form of knowledge-based networks involve the features of true, unreduced intelligence and consciousness (physics/0409140) appearing in complex (multivalued) network dynamics and results.

  8. Dynamical friction in modified Newtonian dynamics

    E-Print Network [OSTI]

    C. Nipoti; L. Ciotti; J. Binney; P. Londrillo

    2008-03-31T23:59:59.000Z

    We have tested a previous analytical estimate of the dynamical friction timescale in Modified Newtonian Dynamics (MOND) with fully non-linear N-body simulations. The simulations confirm that the dynamical friction timescale is significantly shorter in MOND than in equivalent Newtonian systems, i.e. systems with the same phase-space distribution of baryons and additional dark matter. An apparent conflict between this result and the long timescales determined for bars to slow and mergers to be completed in previous N-body simulations of MOND systems is explained. The confirmation of the short dynamical-friction timescale in MOND underlines the challenge that the Fornax dwarf spheroidal poses to the viability of MOND.

  9. Carbon flow and ecosystem dynamics in the Mississippi River plume described by inverse analysis

    E-Print Network [OSTI]

    Breed, Greg Allen

    2002-01-01T23:59:59.000Z

    for the degree of MASTER OF SCIENCE December 2002 Major Subject: Oceanography CARBON FLOW AND ECOSYSTEM DYNAMICS IN THE MISSISSIPPI RIVER PLUME DESCRIBED BY INVERSE ANALYSIS A Thesis by GREG ALLEN BREED Submitted to Texas A&M University in partial... of Department) December 2002 Major Sublect: Oceanography ABSTRACT Carbon Flow and Ecosystem Dynamics in the Mississippi River Plume Described by Inverse Analysis. (December 2002) Greg Allen Breed, B. S. , University of Minnesota Chair of Advisory...

  10. Nontrivial Dynamics in the Early Stages of Inflation

    E-Print Network [OSTI]

    E. Calzetta; C. El Hasi

    1994-08-05T23:59:59.000Z

    Inflationary cosmologies, regarded as dynamical systems, have rather simple asymptotic behavior, insofar as the cosmic baldness principle holds. Nevertheless, in the early stages of an inflationary process, the dynamical behavior may be very complex. In this paper, we show how even a simple inflationary scenario, based on Linde's ``chaotic inflation'' proposal, manifests nontrivial dynamical effects such as the breakup of invariant tori, formation of cantori and Arnol'd's diffusion. The relevance of such effects is highlighted by the fact that even the occurrence or not of inflation in a given Universe is dependent upon them.

  11. Robert Blankenship Director Washington University Dewey Holten

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Washington University David Bocian, University of California, Riverside Donald Bryant, Pennsylvania State University Richard Cogdell, University of Glasgow P. Leslie...

  12. Resource Letter: Dark Energy and the Accelerating Universe

    E-Print Network [OSTI]

    Eric V. Linder

    2007-05-28T23:59:59.000Z

    This Resource Letter provides a guide to the literature on dark energy and the accelerating universe. It is intended to be of use to researchers, teachers, and students at several levels. Journal articles, books, and websites are cited for the following topics: Einstein's cosmological constant, quintessence or dynamical scalar fields, modified cosmic gravity, relations to high energy physics, cosmological probes and observations, terrestrial probes, calculational tools and parameter estimation, teaching strategies and educational resources, and the fate of the universe.

  13. Strategic change and the coevolution of industry-university relationships : evidence from the forest products industry

    E-Print Network [OSTI]

    Pertuzé Salas, Julio Alberto

    2014-01-01T23:59:59.000Z

    In this thesis we present an analysis of the dynamics of industry-university relationships tracing the origin of the relationship and its changes over time as the firm's strategies evolve. We analyze the strategic trajectories ...

  14. MEGAN E. CATTAU Columbia University, Department of Ecology, Evolution, and Environmental Biology

    E-Print Network [OSTI]

    DeFries, Ruth S.

    , and landscape configuration: Changing disturbance dynamics in the peat swamp forest Duke University, Nicholas in the context of sustainable development, including the climate system, water #12;2 resources, food production

  15. MEGAN E. CATTAU Columbia University, Department of Ecology, Evolution, and Environmental Biology

    E-Print Network [OSTI]

    DeFries, Ruth S.

    , and landscape configuration: Changing disturbance dynamics in the peat swamp forest Duke University, Nicholas the climate system, water resources, food production and nutrient cycling, and the role of biodiversity

  16. Thermodynamics of an accelerated expanding universe

    E-Print Network [OSTI]

    Bin Wang; Yungui Gong; Elcio Abdalla

    2005-11-10T23:59:59.000Z

    We investigate the laws of thermodynamics in an accelerating universe driven by dark energy with a time-dependent equation of state. In the case we consider that the physically relevant part of the Universe is that envelopped by the dynamical apparent horizon, we have shown that both the first law and second law of thermodynamics are satisfied. On the other hand, if the boundary of the Universe is considered to be the cosmological event horizon the thermodynamical description based on the definitions of boundary entropy and temperature breaks down. No parameter redefinition can rescue the thermodynamics laws from such a fate, rendering the cosmological event horizon unphysical from the point of view of the laws of thermodynamics.

  17. Cosmic No Hair for Collapsing Universes

    E-Print Network [OSTI]

    James E. Lidsey

    2006-04-11T23:59:59.000Z

    It is shown that all contracting, spatially homogeneous, orthogonal Bianchi cosmologies that are sourced by an ultra-stiff fluid with an arbitrary and, in general, varying equation of state asymptote to the spatially flat and isotropic universe in the neighbourhood of the big crunch singularity. This result is employed to investigate the asymptotic dynamics of a collapsing Bianchi type IX universe sourced by a scalar field rolling down a steep, negative exponential potential. A toroidally compactified version of M*-theory that leads to such a potential is discussed and it is shown that the isotropic attractor solution for a collapsing Bianchi type IX universe is supersymmetric when interpreted in an eleven-dimensional context.

  18. University of Nebraska-Lincoln and University of Florida (Building...

    Open Energy Info (EERE)

    Nebraska-Lincoln and University of Florida (Building Energy Efficient Homes for America) Jump to: navigation, search Name: University of Nebraska-Lincoln and University of Florida...

  19. University Housing University of South Carolina

    E-Print Network [OSTI]

    Almor, Amit

    at the University of South Carolina. It is designed to be a sustainable living and learning environment and employs a more sustainable campus and society. These programming efforts are a collaboration among University Housing, Sustainable Carolina and other campus partners. Community Features · Attending events

  20. , UNIVERSITY Brigham Young University Geology Studies

    E-Print Network [OSTI]

    Seamons, Kent E.

    , UNIVERSITY #12;Brigham Young University Geology Studies Volume 1 5 - 1968 Part 2 Studies for Students No. 1 Guide to the Geology of the Wasatch Mountain Front, Between Provo Canyon and Y Mountain, Northeast of Provo, Utah by J. Keith Rigby and Lehi F. Hintze #12;A publication of the Department of Geology