Relevant bibliographies by topics / Coherent structures dynamics

Academic literature on the topic 'Coherent structures dynamics'

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Published: 11 March 2023

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Journal articles on the topic "Coherent structures dynamics"

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Sirovich, Lawrence. "Turbulence and the dynamics of coherent structures. I. Coherent structures." Quarterly of Applied Mathematics 45, no. 3 (October 1, 1987): 561–71. http://dx.doi.org/10.1090/qam/910462.

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Sirovich, L. "Chaotic dynamics of coherent structures." Physica D: Nonlinear Phenomena 37, no. 1-3 (July 1989): 126–45. http://dx.doi.org/10.1016/0167-2789(89)90123-1.

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Belotserkovskii, O. M., N. N. Fimin, and V. M. Chechetkin. "Coherent hydrodynamic structures and vortex dynamics." Mathematical Models and Computer Simulations 8, no. 2 (March 2016): 135–48. http://dx.doi.org/10.1134/s2070048216020034.

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Colocci, M., F. Bogani, S. Ceccherini, and M. Gurioli. "Coherent Exciton Dynamics in GaAs-Based Semiconductor Structures." Journal of Nonlinear Optical Physics & Materials 07, no. 02 (June 1998): 215–26. http://dx.doi.org/10.1142/s0218863598000181.

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We show that a very powerful tool in the investigation of the coherent exciton dynamics in semiconductors is provided by the study of the emitted light after resonant excitation from pairs of phase-locked femtosecond pulses. Under these conditions, not only the full dynamics of the coherent transients (dephasing times, quantum beat periods, etc.) can be obtained from linear experiments, but it can also be obtained a straightforward discrimination between the coherent or incoherent character of the emission by means of spectral filtering.
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Belotserkovskii, O. M., N. N. Fimin, and V. M. Chechetkin. "Coherent structures in fluid dynamics and kinetic equations." Computational Mathematics and Mathematical Physics 50, no. 9 (September 2010): 1536–45. http://dx.doi.org/10.1134/s096554251009006x.

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Qian, Yuehong, Hudong Chen, and Da-Hsuan Feng. "Diffusive Lorenz dynamics: Coherent structures and spatiotemporal chaos." Communications in Nonlinear Science and Numerical Simulation 5, no. 2 (June 2000): 49–57. http://dx.doi.org/10.1016/s1007-5704(00)90001-7.

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Abdurakipov, Sergey, Vladimir Dulin, and Dmitriy Markovich. "Experimental Investigation of Coherent Structure Dynamics in a Submerged Forced Jet." Siberian Journal of Physics 8, no. 1 (March 1, 2013): 56–64. http://dx.doi.org/10.54362/1818-7919-2013-8-1-56-64.

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The present work investigates the dynamics of coherent structures, including their scales and intensity, in an initial region of a submerged round forced jet by a Particle Image Velocimetry (PIV) technique for measurements of instantaneous velocity fields and statistical analysis tool Dynamic Mode Decomposition (DMD). The PIV measurements were carried out with 1,1 kHz acquisition rate. Application of DMD to the measured set of the velocity fields provided information about dominant frequencies, contained in DMD spectrum, of velocity fluctuations in different flow regions and about scales of the corresponding spatial coherent structures, contained in DMD modes. Additional calculations of time-spectra from turbulent fluctuations showed good agreement between frequencies of the main harmonics and characteristic frequencies of the dominant dynamic modes. Superposition of relevant DMD modes approximately described nonlinear interaction of coherent structures: vortex formation, their quasi-periodic pairing with modulation amplitude of generated harmonics
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Loiseau, Jean-Christophe, Bernd R. Noack, and Steven L. Brunton. "Sparse reduced-order modelling: sensor-based dynamics to full-state estimation." Journal of Fluid Mechanics 844 (April 6, 2018): 459–90. http://dx.doi.org/10.1017/jfm.2018.147.

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We propose a general dynamic reduced-order modelling framework for typical experimental data: time-resolved sensor data and optional non-time-resolved particle image velocimetry (PIV) snapshots. This framework can be decomposed into four building blocks. First, the sensor signals are lifted to a dynamic feature space without false neighbours. Second, we identify a sparse human-interpretable nonlinear dynamical system for the feature state based on the sparse identification of nonlinear dynamics (SINDy). Third, if PIV snapshots are available, a local linear mapping from the feature state to the velocity field is performed to reconstruct the full state of the system. Fourth, a generalized feature-based modal decomposition identifies coherent structures that are most dynamically correlated with the linear and nonlinear interaction terms in the sparse model, adding interpretability. Steps 1 and 2 define a black-box model. Optional steps 3 and 4 lift the black-box dynamics to a grey-box model in terms of the identified coherent structures, if non-time-resolved full-state data are available. This grey-box modelling strategy is successfully applied to the transient and post-transient laminar cylinder wake, and compares favourably with a proper orthogonal decomposition model. We foresee numerous applications of this highly flexible modelling strategy, including estimation, prediction and control. Moreover, the feature space may be based on intrinsic coordinates, which are unaffected by a key challenge of modal expansion: the slow change of low-dimensional coherent structures with changing geometry and varying parameters.
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Sirovich, Lawrence. "Turbulence and the dynamics of coherent structures. III. Dynamics and scaling." Quarterly of Applied Mathematics 45, no. 3 (October 1, 1987): 583–90. http://dx.doi.org/10.1090/qam/910464.

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Sánchez-Martín, P., J. J. Masdemont, and M. Romero-Gómez. "From manifolds to Lagrangian coherent structures in galactic bar models." Astronomy & Astrophysics 618 (October 2018): A72. http://dx.doi.org/10.1051/0004-6361/201833451.

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We study the dynamics near the unstable Lagrangian points in galactic bar models using dynamical system tools in order to determine the global morphology of a barred galaxy. We aim at the case of non-autonomous models, in particular with secular evolution, by allowing the bar pattern speed to decrease with time. We have extended the concept of manifolds widely used in the autonomous problem to the Lagrangian coherent structures (LCS), widely used in fluid dynamics, which behave similar to the invariant manifolds driving the motion. After adapting the LCS computation code to the galactic dynamics problem, we apply it to both the autonomous and non-autonomous problems, relating the results with the manifolds and identifying the objects that best describe the motion in the non-autonomous case. We see that the strainlines coincide with the first intersection of the stable manifold when applied to the autonomous case, while, when the secular model is used, the strainlines still show the regions of maximal repulsion associated to both the corresponding stable manifolds and regions with a steep change of energy. The global morphology of the galaxy predicted by the autonomous problem remains unchanged.
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Dissertations / Theses on the topic "Coherent structures dynamics"

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Petviachvili, Nikolai. "Coherent structures in nonlinear plasma dynamics /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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Davis, J. A. "Ultrafast coherent dynamics in semiconductor nano-structures." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598402.

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This thesis reports on the work done in studying coherent dynamics of excitons in quantum wells and exciton spins in quantum dots. Four-wave-mixing experiments were performed in a magnetic field on GaAs/AlGaAs single quantum wells known to contain spatially large monolayer islands. The properties of the dynamics of the signals are discussed, and compared to previous values. Beating was observed between the monolayer islands, and the variation of the phase of these beats was examined in an attempt to determine the mechanism for coupling between them. The majority of the data suggests the monolayer islands are not coherently coupled, however, the behaviour under some conditions brought this into question and required further modelling. Models for a three-level system and two on-interacting two-level systems including the effects of a local field are presented. Neither model was able to reproduce the experimental data on its own, however, a combination of the two was successful. On the basis of the modelling, it was shown that the contribution to the signal from coherently coupled transitions decreases as a function of magnetic field. This gives some insight into the possible coupling mechanisms, and these are discussed. Pump-probe experiments are performed on InGaAs/GaAs quantum dots in an attempt to obtain details of the coherent exciton-spin dynamics in such systems. Decoherence of the exciton spin is observed in sufficiently high magnetic fields, and the dependence of the dephasing time on field strength and temperature are studied. To my knowledge, these are the first reported experimental results showing decoherence of exciton spin. Comparisons of the observed behaviour with existing predictions are made in an attempt to determine the mechanism for loss of exciton spin coherence in quantum dots. None of the predicted mechanisms were able to fit my experimental data adequately, suggesting the presence of some other more efficient mechanism.
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劉國強 and Kwok-keung Lau. "Interactions of coherent structures in annular jets." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31232632.

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周健強 and Kin-keung Chow. "Acceleration of coherent structures in free shear layer." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31240069.

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Harter, Braxton Nicholas. "Lagrangian Coherent Structures in Vortex Ring Formation." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1565828293505214.

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Loewen, Stuart Reid. "Statistics and dynamics of coherent structures on turbulent grid-flow." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27437.

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This thesis examines the statistics and dynamics of turbulent flow structures generated by towing a grid through a tank of water. The structures were made visible by recording the paths of aluminum tracers moving with the water surface. Flow patterns recorded using a time-exposure method were manually analyzed to extract information on the structure statistics. This two-dimensional flow field was found to be composed of closed rotating 'surface eddies', open and largely translational 'river' motion and stagnant regions. Energy distributions of the eddies and rivers were obtained and characterized by Boltzmann type distributions. A newly developed computer-automated structure identification and flow field analysis system was used to study the structure dynamics. The system analyzes digital images obtained from video recordings of the tracer motion. The predominant evolution processes of initial vortex production, eddy pairing, viscous decay and the omega decay were examined. Flow Reynolds numbers, based on bar spacing, of about 10,000 were examined. The structure statistics and dynamics study was performed in order to examine the validity and viability of a new model for turbulence. The model predicts the evolution of a population of structures using rate equations where the rate coefficients are determined by the individual structure dynamics. A summary of the model is presented and contrasted with models based the the Reynolds stresses as well as computational models.
Science, Faculty of
Physics and Astronomy, Department of
Graduate
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Sundkvist, David. "Space Plasma Dynamics : Instabilities, Coherent Vortices and Covariant Parametrization." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6051.

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Budanur, Nazmi Burak. "Exact coherent structures in spatiotemporal chaos: From qualitative description to quantitative predictions." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54445.

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The term spatiotemporal chaos refers to physical phenomena that exhibit irregular oscillations in both space and time. Examples of such phenomena range from cardiac dynamics to fluid turbulence, where the motion is described by nonlinear partial differential equations. It is well known from the studies of low dimensional chaotic systems that the state space, the space of solutions to the governing dynamical equations, is shaped by the invariant sets such as equilibria, periodic orbits, and invariant tori. State space of partial differential equations is infinite dimensional, nevertheless, recent computational advancements allow us to find their invariant solutions (exact coherent structures) numerically. In this thesis, we try to elucidate the chaotic dynamics of nonlinear partial differential equations by studying their exact coherent structures and invariant manifolds. Specifically, we investigate the Kuramoto-Sivashinsky equation, which describes the velocity of a flame front, and the Navier-Stokes equation for an incompressible fluid in a circular pipe. We argue with examples that this approach can lead to a theory of turbulence with predictive power.
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Eickemeyer, Felix. "Ultrafast dynamics of coherent intersubband polarizations in quantum wells and quantum cascade laser structures." Doctoral thesis, [S.l.] : [s.n.], 2002. http://dochost.rz.hu-berlin.de/dissertationen/eickemeyer-felix-2002-07-03.

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Higgins, David. "Dynamics and statistical features of coherent plasma structures in the SOL of a tokamak." Thesis, University of Warwick, 2012. http://wrap.warwick.ac.uk/57731/.

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Understanding surface erosion in tokamaks due to contact with hot plasma is critical in designing new high power devices. The propagation of the plasma through the scrape off layer (SOL) ultimately defines the spatio-temporal characteristics of this erosion, hence modelling of this region is an important area of research. Transport in the SOL is attributed to advective motions of plasma blobs, for which the advective velocity is estimated in the literature. A new paradigm for comparing the theory of plasma blobs with experimental data is developed, which treats density and velocity data as sets of coherent structures via a peak detection algorithm. The phase difference of plasma density and radial velocity peaks take values depending on the dominating physics of the blob motion. Values of this phase difference are predicted in the interchange and drift wave cases for a strongly nonlinear plasma. Analysis of MAST data reveals interchange activity in the edge and SOL, and a phase structure typical of sheath limited models in the SOL. A further application of the paradigm examines the blob velocity-density scaling v ∝ nα. A new sheath limited model for blob advection with divertor density nt constant gives α = 1. Predictions in the zero parallel current case depend on the blob nonlinearity; we examine the dependency of α on the nonlinearity by solving the time independent equation of blob motion for a range of density profiles, finding α ∼ 0.3 for MAST nonlinearity strength. The α parameter is estimated statistically from MAST data, and it found to peak at α ∼ 1 near the last closed flux surface (LCFS) and fall to zero further from the plasma. The scaling behaviour is further examined using the TOKER code. A numerical model, hTOKER, is developed. A subgrid model is employed that terminates the plasma at a chosen scale with defined spectral properties, which allows a physically accurate way to reduce resolution and computational burden. We examine sheath potential drop (SPD) and finite ion temperature (FTI) effects on SOL transport in the cases of constant (CTI) and flute (SI) nt boundary conditions. For the advection of individual blobs, SPD effects that are stable in the SI case are found to be unstable in the CTI case, and FTI effects are found to be stabilising in all cases. SOL plasma simulations are used to examine the differences in particleenergy flux and peak phase difference using floating or plasma potential. Floating potential overestimates flux by a factor 2, and shifts phase differences from 0◦ to ∼ −30◦. FTI effects are without cancellation from the gyro-viscous counterparts.
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Books on the topic "Coherent structures dynamics"

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Bahsoun, Wael, Christopher Bose, and Gary Froyland, eds. Ergodic Theory, Open Dynamics, and Coherent Structures. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-0419-8.

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Peter, Sørensen Mads, and Christiansen Peter L. 1937-, eds. Nonlinear science: Emergence and dynamics of coherent structures. Oxford: Oxford University Press, 1999.

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Nonlinear science: Emergence and dynamics of coherent structures. 2nd ed. Oxford: Oxford University Press, 2003.

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Bakunin, Oleg G. Chaotic Flows: Correlation effects and coherent structures. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2011.

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Derks, Gerardina Lamberta Adriana. Coherent structures in the dynamics of perturbed Hamiltonian systems. Enschede: Faculty of Applied Math., Univ. of Twente, 1992.

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KIDA, SHIGEO, ed. IUTAM Symposium on Elementary Vortices and Coherent Structures: Significance in Turbulence Dynamics. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-4181-0.

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O, Métais, Lesieur Marcel, and Turbulence 89: Organized Structures and Turbulence in Fluid Mechanics (1989: Grenoble, France), eds. Turbulence and coherent structures: Selected papers from "Turbulence 89: Organized Structures and Turbulence in Fluid Mechanics", Grenoble, 18-21 September 1989. Dordrecht: Kluwer Academic Publishers, 1991.

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Metais, O. Turbulence and Coherent Structures: Selected Papers from "Turbulence 89: Organized Structures and Turbulence in Fluid Mechanics", Grenoble, 18-21 September 1989. Dordrecht: Springer Netherlands, 1991.

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IUTAM Symposium on Elementary Vortices and Coherent Structures: Significance in Turbulence Dynamics (2004 Kyoto, Japan). IUTAM Symposium on Elementary Vortices and Coherent Structures: Significance in Turbulence Dynamics : proceedings of the IUTAM Symposium held at Kyoto International Community House, Kyoto, Japan, 26-28 October 2004. Dordrecht: Springer, 2006.

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Manipulating quantum structures using laser pulses. Cambridge, UK: Cambridge University Press, 2011.

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Book chapters on the topic "Coherent structures dynamics"

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Abraham, Farid F. "Dynamics of Fracture." In Coherent Structures in Complex Systems, 436–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44698-2_27.

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Gazendam, Henk W. M. "Models as coherent sign structures." In Dynamics and Change in Organizations, 183–213. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0161-8_10.

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Brändas, E. "Relaxation Processes and Coherent Dissipative Structures." In Dynamics During Spectroscopic Transitions, 148–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79407-0_6.

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LaCombe, Jeffrey C., Matthew B. Koss, Cindie Giummarra, Julie E. Frei, Afina O. Lupulescu, and Martin E. Glicksman. "Evidence for Eigenfrequencies in Dendritic Growth Dynamics." In Coherent Structures in Complex Systems, 283–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44698-2_18.

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Kida, Shigeo. "Description and Dynamics of Vortical Structures of Turbulence." In Coherent Structures in Complex Systems, 3–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44698-2_1.

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Ensslin, K., and R. Schuster. "Antidot Superlattices: Classical Trajectories and Phase Coherent Electrons." In Quantum Dynamics of Submicron Structures, 247–61. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0019-9_20.

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Fajans, Joel, and Daniel Durkin. "Inviscid Two-Dimensional Fluid Dynamics Experiments with Magnetized Electron Columns." In Coherent Structures in Complex Systems, 319–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44698-2_20.

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Joulin, Guy, Gaël Boury, Pierre Cambray, Yves D’Angelo, and Karl Joulain. "Nonlinear Dynamics of Wrinkled Premixed Flames and Related Statistical Problems." In Coherent Structures in Complex Systems, 127–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44698-2_9.

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Rosensteel, G. "Galactic Dynamics in the Siegel Half-Plane." In Quantization, Coherent States, and Complex Structures, 271–79. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1060-8_31.

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Grauer, R., and Y. S. Kivshar. "Dynamics of Parametrically Driven Sine-Gordon Breathers." In Nonlinear Coherent Structures in Physics and Biology, 381–84. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-1343-2_59.

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Conference papers on the topic "Coherent structures dynamics"

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SCHADOW, K., E. GUTMARK, T. PARR, D. PARR, and K. WILSON. "Large-scale coherent structures as drivers of combustion instability." In 19th AIAA, Fluid Dynamics, Plasma Dynamics, and Lasers Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1987. http://dx.doi.org/10.2514/6.1987-1326.

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Paschereit, Christian, Wolfgang Weisenstein, and Ephraim Gutmark. "Role of coherent structures in acoustic combustion control." In 29th AIAA, Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1998. http://dx.doi.org/10.2514/6.1998-2433.

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Lambert, Andrew R., Thomas M. Kirk, and Serhiy Yarusevych. "Poster: Coherent Structures in Separation Bubbles." In 67th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2014. http://dx.doi.org/10.1103/aps.dfd.2014.gfm.p0074.

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Paeres, David, Christian Lagares, Jean Santiago, Alan Craig, Kenneth Jansen, and Guillermo Araya. "Video: Turbulent Coherent Structures via VR/AR." In 73th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2020. http://dx.doi.org/10.1103/aps.dfd.2020.gfm.v0045.

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Lagares, Christian, and Guillermo Araya. "Video: High-Resolution 4D Lagrangian Coherent Structures." In 75th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2022. http://dx.doi.org/10.1103/aps.dfd.2022.gfm.v0025.

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HSIAO, FEI-BIN. "Subharmonic evolution of coherent structures in an excited plane jet." In 1st National Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1988. http://dx.doi.org/10.2514/6.1988-3609.

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FUKUNISHI, YU, HIROSHI SATO, and OSAMU INOUE. "Study of developing process of coherent structures in the turbulent boundary layer." In 19th AIAA, Fluid Dynamics, Plasma Dynamics, and Lasers Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1987. http://dx.doi.org/10.2514/6.1987-1253.

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Byrne, Greg, Christopher Marcotte, and Roman Grigoriev. "Exact coherent structures and dynamics of cardiac tissue." In 2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO). IEEE, 2014. http://dx.doi.org/10.1109/esgco.2014.6847523.

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Lee, Jin, and Tamer Zaki. "Video: Coherent energetic structures in turbulent boundary layers." In 70th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2017. http://dx.doi.org/10.1103/aps.dfd.2017.gfm.v0083.

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Sen, Abhijit, A. Sen, S. Sharma, and P. N. Guzdar. "Collective Dynamics of Strongly Coupled Dusty Plasmas." In INTERNATIONAL SYMPOSIUM ON WAVES, COHERENT STRUCTURES AND TURBULENCE IN PLASMAS. AIP, 2010. http://dx.doi.org/10.1063/1.3526156.

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Reports on the topic "Coherent structures dynamics"

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Zabusky, N. J. Vortex Dynamics of Coherent and Chaotic Structures (Including Algorithms for Computer Simulations and Diagnosis). Fort Belvoir, VA: Defense Technical Information Center, December 1987. http://dx.doi.org/10.21236/ada193580.

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Hwa, Yue-Yi, Sharon Kanthy Lumbanraja, Usha Adelina Riyanto, and Dewi Susanti. The Role of Coherence in Strengthening CommunityAccountability for Remote Schools in Indonesia. Research on Improving Systems of Education (RISE), February 2022. http://dx.doi.org/10.35489/bsg-rise-wp_2022/090.

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Incoherence in accountability relationships can hamper the quality of education. Such incoherence can be a particular challenge in resource-constrained, remote villages where teachers tend to have higher educational capital and social status than the parents and communities that they serve. We analyze quantitative and qualitative data from a randomized controlled trial of a social accountability mechanism (SAM) for schools in remote Indonesian villages. The intervention had three treatment arms, all of which included the SAM, which engaged village-level stakeholders in a consensus-building process that led to joint service agreements for supporting the learning process. Prior analyses have found that all three treatment arms significantly improved student learning, but the treatment arm combining the SAM with performance pay based on camera-monitored teacher attendance led to much larger gains than the SAM-only treatment or the treatment arm combining the SAM with teacher performance pay based on a community-evaluated scorecard. Drawing on a range of quantitative data sources across all treatment schools (process monitoring, survey, and service agreement indicators) and qualitative data from nine case study schools (interviews and focus group discussions), we show firstly that the student learning gains across all three treatment arms were accompanied by increases in the coherence of the accountability relationships between village-level stakeholders, and in the degree to which these relationships were oriented toward the purpose of cultivating learning. We further show that the treatment combining SAM with camera-monitored teacher performance pay led to greater improvements in the coherence of accountability relationships than the other treatment arms, because the cameras improved both the technical capacity and the social legitimacy of community members to hold teachers accountable. This coherence-focused, relational explanation for the relative effectiveness of the treatment arms has more explanatory power than alternative explanations that focus narrowly on information quality or incentive structure. Our analysis reinforces arguments for ensuring that accountability structures are coherent with the local context, including local social structures and power dynamics.
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Narayanan, Vinod, and Benn Eilers. Identification of Coherent Structure Dynamics in Wall-Bounded Sprays using Proper Orthogonal Decomposition. Fort Belvoir, VA: Defense Technical Information Center, August 2010. http://dx.doi.org/10.21236/ada532067.

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Dzebo, Adis, and Kevin M. Adams. The coffee supply chain illustrates transboundary climate risks: Insights on governance pathways. Stockholm Environment Institute, April 2022. http://dx.doi.org/10.51414/sei2022.002.

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The interconnections between countries in a globalizing world continue to deepen and are central to the modern international economy. Yet, governance efforts to build resilience to the adverse risks and impacts of climate change are highly fragmented and have not sufficiently focused on these international dimensions. Relationships between people, ecosystems and economies across borders change the scope and nature of the climate adaptation challenge and generate climate risks that are transboundary (Challinor et al., 2017). Climate impacts in one country can create risks and opportunities – and therefore may require adaptation – in other countries, due to cross-border connectivity within regions and globally (Hedlund et al., 2018). These Transboundary Climate Risks (TCRs) may develop in one location remote from the location of their origin. This dynamic necessitates examining the governance structures for managing climate change adaptation. For example, with regard to trade and international supply chains, climate change impacts in one location can disrupt local economies and vulnerable people’s livelihoods, while also affecting the price, quality and availability of goods and services on international markets (Benzie et al., 2018). Coffee is one of the most traded commodities in the world with an immensely globalized supply chain. The global coffee sector involves more than 100 million people in over 80 countries. Coffee production and the livelihoods of smallholder coffee farmers around the world are at risk due to climate change, threatening to disrupt one of the world’s largest agricultural supply chains. The coffee supply chain represents an important arena for public and private actors to negotiate how resource flows should be governed and climate risks should be managed. Currently, neither governments nor private sector actors are sufficiently addressing TCRs (Benzie & Harris, 2020) and no clear mandates exist for actors to take ownership of this issue. Furthermore, the United Nations Framework Convention on Climate Change (UNFCCC), the main body for climate change policy and governance, does not provide any coherent recommendations on how to manage TCRs. This governance gap raises questions about what methods are likely to effectively reduce climate risk and be taken seriously by coffee market stakeholders. This policy brief explores different ways to govern TCRs, and how public and private actors view their effectiveness and legitimacy. Focusing on the Brazilian-German coffee supply chain, the brief presents a deductive framework of five governance pathways through which TCRs could be managed. It is based on 41 semi-structured interviews with 65 Brazilian and German public and private experts, including roasters, traders, cooperatives, associations and certification schemes, as well as government ministries, international development agencies, international organizations and civil society representatives.
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