Relevant bibliographies by topics / Noise induced coherence

Academic literature on the topic 'Noise induced coherence'

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Published: 11 March 2023

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Journal articles on the topic "Noise induced coherence"

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Cao, Chun Yan, Shui Dong Xiong, Zheng Liang Hu, and Yong Ming Hu. "Suppression of Double Rayleigh Scattering Induced Coherent Noise in a Remote Fiber Sensor System Using PGC Technique." Advanced Materials Research 571 (September 2012): 185–89. http://dx.doi.org/10.4028/www.scientific.net/amr.571.185.

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Double Rayleigh scattering (DRS) induces coherent noises in remotely interrogated optical fiber sensor systems especially when high coherence laser sources are used. Phase generation carried (PGC) technique has been used in optical fiber sensors to overcome bias induced signal fading and eliminated incoherent noises at low frequency. In this paper we demonstrated that PGC technique can also suppress DRS induced coherent noises. In an experimental setup with total 50-km input and output lead fibers, we achieved maximum 7dB of intensity noise suppression and maximum 10dB of phase noise suppression. With PGC technique, DRS induced phase noise has been suppressed to the sensor self-noise level.
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LIM, WOOCHANG, and SANG-YOON KIM. "COUPLING-INDUCED SPIKING COHERENCE IN COUPLED SUBTHRESHOLD NEURONS." International Journal of Modern Physics B 23, no. 09 (April 10, 2009): 2149–57. http://dx.doi.org/10.1142/s0217979209052431.

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We consider a large ensemble of globally coupled subthreshold Morris–Lecar neurons. We numerically investigate collective coherence of noise-induced spikings by varying the coupling strength J. As J passes a lower threshold, a transition to collective spiking coherence, which is described in terms of an order parameter, occurs because the coupling stimulates coherence between noise-induced spikings. However, when passing a higher threshold, the coupling induces oscillator death (i.e., quenching of noise-induced spikings) because each neuron is attracted to a noisy equilibrium state. Through competition of these two different roles of coupling, coupling-induced spiking coherence is found to occur in a large range of intermediate coupling strength. The degree of spiking coherence is well-characterized in terms of a coherence measure reflecting the degree of "resemblance" of the global potential to the local potential.
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SHERSTNEV, V. V., A. KRIER, A. G. BALANOV, N. B. JANSON, A. N. SILCHENKO, and P. V. E. McCLINTOCK. "MID-INFRARED LASING INDUCED BY NOISE." Fluctuation and Noise Letters 03, no. 01 (March 2003): L91—L95. http://dx.doi.org/10.1142/s0219477503001129.

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We demonstrate that external noise can play a constructive role in a laser diode, inducing coherent mid-infrared radiation. Depending on noise intensity, the induced lasing can be either unimode or mulitimode. The coherence of the radiation in each mode reaches its maximum at an optimal noise intensity that differs depending on the mode. The phenomenon can therefore be classified as a multiple coherence resonance.
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LIM, WOOCHANG, and SANG-YOON KIM. "STOCHASTIC SPIKING COHERENCE IN COUPLED SUBTHRESHOLD MORRIS-LECAR NEURONS." International Journal of Modern Physics B 23, no. 05 (February 20, 2009): 703–10. http://dx.doi.org/10.1142/s0217979209049991.

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We consider a large population of globally coupled subthreshold Morris-Lecar neurons. By varying the noise intensity D, we numerically investigate stochastic spiking coherence (i.e., collective coherence between noise-induced neural spikings). As D passes a lower threshold, a transition from an incoherent to a coherent state occurs because of a constructive role of noise to stimulate coherence between noise-induced spikings. However, when passing a higher threshold of D, another transition from a coherent to an incoherent state takes place due to a destructive role of noise to spoil the spiking coherence. Such an incoherence-coherence-incoherence transition is well-described in terms of the order parameter which is just the mean square deviation of the global potential. In the coherent regime, we also characterize the degree of stochastic spiking coherence by using a coherence measure which reflects the degree of "resemblance" of the global potential to the local potential. Thus, stochastic spiking coherence with large coherence measure is found to occur over a large range of intermediate noise intensity.
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Dodin, Amro, and Paul Brumer. "Noise-induced coherence in molecular processes." Journal of Physics B: Atomic, Molecular and Optical Physics 54, no. 22 (November 17, 2021): 223001. http://dx.doi.org/10.1088/1361-6455/ac3e77.

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Abstract Excitation of molecules by incident incoherent electromagnetic radiation, such as sunlight, is described in detail and contrasted with the effect of coherent (e.g. laser) light. The nature of the quantum coherences induced by the former, relevant to transport processes in nature and in technology, is emphasized. Both equilibrium and steady state scenarios are discussed, three examples: simple models, calcium excitation in polarized light, and the isomerization of retinal in rhodopsin are used to expose the underlying qualitative nature of the established coherences.
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Wu, Kaijun, Huan Zheng, and Tao Li. "Coherence Resonance Behavior of FitzHugh-Nagumo Neurons Induced by Electromagnetic Field Driven by Phase Noise." Discrete Dynamics in Nature and Society 2022 (January 27, 2022): 1–18. http://dx.doi.org/10.1155/2022/8384444.

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Noise exists widely in the nervous system, and plays a crucial role in the nervous system information processing. Noise can not only enhance but also weaken the ability of the nervous system to process information. Neurons are in a complex and variable electromagnetic field. Electromagnetic induction plays an important role in regulating the changes of neuronal membrane potential. Therefore, this paper simulates the electromagnetic field environment of the nervous system with a memristor and analyses the rich coherence resonance behavior of FitzHugh-Nagumo (FHN) neuron system under the drive of phase noise. By taking the amplitude, period and noise intensity of phase noise as the main parameters and the parameters of memristor as auxiliary parameters, the two-parameter changes are made from the angle of the amplitude and period of phase noise, the amplitude and intensity of phase noise, and the noise intensity and period of phase noise, respectively. The dynamic behaviors of coherent resonance of FHN neuron system are analyzed from the amplitude and period, amplitude and intensity as well as intensity and period of phase noise, respectively. When the amplitude and period of the phase noise and the intensity and period of the phase noise are used as independent variables for the two-parameter analysis, the FHN neuron system shows rich dynamic behaviors such as coherence mono-resonance, coherence bi-resonance and coherence multi-resonance. Especially when the amplitude and period of phase noise change as two-parameter, the system presents a coherence resonance of discharge pattern with period-adding cluster discharge at the valley. When the amplitude and intensity of phase noise are taken as independent variables for two-parameter analysis, FHN neuronal system presents single or dual coherence resonance at any value of noise intensity with the change of phase noise amplitude. The simulated results show that the FHN neuron system demonstrates rich coherence resonance behaviors under the drive of phase noise when the effect of electromagnetic induction in the nervous system is simulated by memristor.
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Rappel, Wouter-Jan, and Alain Karma. "Noise-Induced Coherence in Neural Networks." Physical Review Letters 77, no. 15 (October 7, 1996): 3256–59. http://dx.doi.org/10.1103/physrevlett.77.3256.

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Carter, Jerry A., Noel Barstow, Paul W. Pomeroy, Eric P. Chael, and Patrick J. Leahy. "High-frequency seismic noise as a function of depth." Bulletin of the Seismological Society of America 81, no. 4 (August 1, 1991): 1101–14. http://dx.doi.org/10.1785/bssa0810041101.

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Abstract Evidence is presented supporting the view that high-frequency seismic noise decreases with increased depth. Noise amplitudes are higher near the free surface where surface-wave noise, cultural noise, and natural (wind-induced) noise predominate. Data were gathered at a hard-rock site in the northwestern Adirondack lowlands of northern New York. Between 15- and 40-Hz noise levels at this site are more than 10 dB less at 945-m depth than they are at the surface, and from 40 to 100 Hz the difference is more than 20 dB. In addition, time variability of the spectra is shown to be greater at the surface than at either 335- or 945-m depths. Part of the difference between the surface and subsurface noise variability may be related to wind-induced noise. Coherency measurements between orthogonal components of motion show high-frequency seismic noise is more highly organized at the surface than it is at depth. Coherency measurements between the same component of motion at different vertical offsets show a strong low-frequency coherence at least up to 945-m vertical offsets. As the vertical offset decreases, the frequency band of high coherence increases.
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Xie, Huijuan, and Yubing Gong. "Temporal Coherence Transitions Induced by Channel Noise in Scale-Free Neuronal Networks with Time Delay." Fluctuation and Noise Letters 16, no. 04 (November 21, 2017): 1750031. http://dx.doi.org/10.1142/s0219477517500316.

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In this paper, we study the effect of channel noise on the temporal coherence of scale-free Hodgkin–Huxley neuronal networks with time delay. It is found that the temporal coherence of the neuronal networks changes as channel noise intensity is varied in different ways depending on the range of channel noise intensity. The temporal coherence monotonically decreases with the increase of channel noise intensity for too small or too big channel noise intensity. However, for intermediate channel noise intensity it intermittently and rapidly becomes high and low as channel noise intensity is varied, exhibiting temporal coherence transitions. Moreover, this phenomenon is dependent on coupling strength and network average degree and becomes strongest when they are optimal. This result shows that channel noise has a regulation effect on the temporal coherence of the delayed neuronal networks by inducing temporal coherence transitions. This provides a new insight into channel noise for the information processing and transmission in neural systems.
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Ginzburg, Saul L., and Mark A. Pustovoit. "Bursting Dynamics of a Model Neuron Induced by Intrinsic Channel Noise." Fluctuation and Noise Letters 03, no. 03 (September 2003): L265—L274. http://dx.doi.org/10.1142/s0219477503001361.

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Irregular switching of ion channels is an inherent source of noise in real neurons. Taking into account the stochastic nature of calcium and fast potassium channel currents in the Plant model of a bursting neuron, we found noise-induced coherent bursting even in the case when the deterministic neuron is silent. The bursts keep their regularity in a wide range of membrane sizes. The measure of this coherence, the coefficient of variation of interspike intervals, passes through a minimum at the membrane area near 150 μ m 2. The degree of coherence obtained from power spectra of spike trains increases monotonously with decrease of membrane size.
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Dissertations / Theses on the topic "Noise induced coherence"

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Anderloni, Sebastiano. "Noisy effects in ultracold atomic gases." Doctoral thesis, Università degli studi di Trieste, 2009. http://hdl.handle.net/10077/3062.

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2007/2008
The experimental realization of Bose Einstein Condensates opened the path for a wide range of investigations in physics of ultracold atoms; the peculiar characteristics of these systems and the recent advances in optical confinement technology make them preferred candidates for the implementation of quantum communication and information protocols based on many-body coherent states. In this framework, the dissertation focuses on some consequences that the presence of a weakly coupled external environment has on a system of cold atoms in an optical trap. Typically, the presence of an environment leads to noise and dissipation; whereas the thesis investigates the capability of the environment of mediating an induced interaction between otherwise isolated atoms, making possible the rising of coherence between atoms localized in different sites of the confining potential. The effects of this coherence can be interpreted in terms of an atomic current flowing across the system. Standard open quantum systems methods, mainly related to the weak coupling limit, have been used in order to describe the dissipative dynamics by means of a memoryless master equation. Except for some special cases, this master equation cannot be analitically integrated; therefore, suitable techniques have been used to describe the coherence behaviour at small times, which are of the order of the characteristic times of the dissipative phenomena in the thesis. In detail, the weak coupling limit has been reviewed in the general formalism of open quantum systems; then, after a brief introduction about the physycs of ultracold atoms, the master equation ruling the dissipative dynamics in the presence of a weakly coupled environment, typically a heat bath or a stochastic classical field, has been derived. Two different kinds of coupling have been considered, mainly differing in the conservation of the total number of particles. Having obtained the master equation, which depends on typical phenomenological parameters relative to the environment, the cases in which a dissipative induced current arises as a consequence of the coupling with the environment, have been examined. The effects of this current have been shown to be, in principle, experimentally accessible by looking at absorption images of the freely expanding atomic cloud once the trapping potential has been switched off. From these images it is possible to extract a spatial density profile after the free expansion; the presence of interference fringes in this density profile denotes the presence of coherence in the trapped system. This experimental procedure has been described in the general framework of the quantum measurement theory: from actual experimental evidence, it has been shown that a consistent use of the wave packet reduction principle leads to theoretical predictions for the expected density profile, which are slightly different from the ones commonly used in the literature. These differences have been briefly discussed both theoretically and for their possible experimental relevance.
La realizzazione sperimentale di condensati di Bose-Einstein ha inaugurato un ampio settore di studi nell'ambito della fisica dei gas di atomi ultrafreddi anche dal punto di vista teorico; le loro particolari caratteristiche, unite allo sviluppo delle tecnologie di confinamento di molti atomi in reticoli ottici, ne fanno degli ottimi candidati per l'applicazione di alcuni protocolli di comunicazione ed informazione quantistica basati sulla costruzione di stati coerenti a molti corpi. Il lavoro di tesi parte da questo contesto e si concentra su alcune conseguenze della presenza di un ambiente esterno in interazione con un sistema di atomi freddi confinati in potenziali ottici. Tipicamente, la presenza di un ambiente da' luogo ad effetti di rumore e dissipazione; la tesi studia invece la possibilita' che esso medi un'interazione tra atomi altrimenti isolati, rendendo in alcuni casi possibile la generazione di coerenza tra atomi localizzati nei siti costituenti il potenziale confinante, coerenza che si manifesta in maniera sperimentalmente rilevabile per mezzo di una corrente di materia. Le tecniche utilizzate si rifanno alla teoria dei sistemi quantistici aperti, ed in particolare al limite di accoppiamento debole, grazie al quale e' possibile descrivere la dinamica dissipativa tramite un'equazione master priva di effetti di memoria. Tranne che in casi molto particolari, non e' possibile integrare analiticamente l'equazione master; sono percio' state utilizzate delle tecniche in grado di rivelare il comportamento della coerenza per tempi sufficientemente brevi, quali quelli tipici dei fenomeni dissipativi studiati in questa tesi. In dettaglio, nella tesi e' stata introdotta dapprima la teoria del limite di accoppiamento debole nell'opportuno formalismo dei sistemi quantistici aperti; quindi, dopo una breve introduzione della fisica degli atomi freddi confinati in potenziali ottici, e' stata ricavata l'equazione master che ne determina l'evoluzione dissipativa quando questi sono debolmente accoppiati ad un ambiente esterno, tipicamente un bagno termico oppure un campo stocastico classico. Sono stati considerati due possibili esempi di accoppiamento, i quali differiscono tra loro per la conservazione e non del numero totale di atomi. Una volta ricavata l'equazione master, caratterizzata da specifici parametri fenomenologici relativi all'ambiente, sono stati studiati i casi in cui a questi corrisponde una corrente quantistica tra i siti del potenziale ottico confinante. Gli effetti di tale corrente sono stati dimostrati essere in linea di principio sperimentalmente accessibili tramite immagini di assorbimento ottenute illuminando le nuvole atomiche liberate dal confinamento.Da queste si ottengono misure di densita' spaziale che evidenziano, tramite frange di interferenza, l'eventuale presenza di coerenza di fase. Queste procedure sperimentali sono state descritte per mezzo della teoria quantistica della misura: in base alle evidenze sperimentali finora acquisite, e' stato mostrato che un utilizzo consistente delle tecniche relative alla riduzione del pacchetto d'onda porta ad una predizione teorica per il profilo di densita' spaziale formalmente diversa da quella comunemente utilizzata in letteratura. Questa differenza e' stata brevemente discussa sia per quanto riguarda il suo aspetto teorico che per la sua possibile rilevanza sperimentale.
XXI Ciclo
1981
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Mousa, Pasandi Mohammad. "Adaptive decision-directed channel equalization and laser phase noise induced inter-carrier-inteference mitigation for coherent optical orthogonal frequency division multiplexing transport systems." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114464.

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The explosive growth of global Internet traffic has placed tremendous strain on both op-tical networks and optical transmission systems, underscoring the need for not only high-capacity transmission links but also for flexible, reconfigurable, and adaptive networks. Re-cent progress in complementary metal–oxide–semiconductor (CMOS) technology has fa-cilitated the use of digital signal processing (DSP) in optical communication systems. Blessed with the revival of coherent optical transmission systems, over the past few years, DSP-enabled, software-defined optical transmission (SDOT) systems have led the funda-mental paradigm shift from inflexible optical networks to robust, reconfigurable, plug-and-play optical networks.Recently, coherent optical orthogonal frequency division multiplexing (CO-OFDM) has been intensively investigated as a promising modulation format for realizing coherent transmission systems. Although CO-OFDM has attracted significant interest in the research community, it has yet to leave a tangible impact on the commercial front due to implemen-tation shortcomings, such as excessive overhead, and susceptibility to fibre nonlinearities and frequency/phase noise.This thesis explores DSP-based solutions for CO-OFDM transmission systems, including two key original contributions. The first contribution is a novel adaptive decision-directed channel equalizer (ADDCE) that aims to reduce the required overhead in CO-OFDM transmission systems. ADDCE retrieves an estimation of the phase noise value after an initial decision making stage, by extracting and averaging the phase drift of all OFDM sub-channels, demonstrating zero-overhead phase noise compensation. Moreover, it updates the channel transfer matrix on a symbol-by-symbol basis, thus enabling a reduction in the associated overhead with pilot symbols. The second original contribution of this thesis focuses on the mitigation of the effect of the laser phase noise induced inter-carrier interfer-ence (ICI) in CO-OFDM systems. This interpolation-based ICI compensator estimates the time-domain phase noise samples using linear interpolation between the common-phase-error (CPE) estimates of consecutive OFDM symbols.The performances of the aforementioned DSP equalization schemes are numerically and experimentally studied in reduced-guard-interval dual-polarization CO-OFDM (RGI-DP-CO-OFDM) transmission systems, and are found to demonstrate superior performance over conventional equalizers (CEs). In addition, a computational complexity analysis of the pro-posed equalizers is provided, which confirms a low implementation complexity.
La croissance explosive du trafic globale sur Internet a crée une pression importante sur les réseaux optiques et les systèmes de transmission optiques; ce qui suggère le besoin de liens de transmission de haute capacité ainsi que de réseaux adaptables, reconfigurables et flexible. Les récents progrès dans les technologies de semiconducteurs métal-oxyde com-plémentaire (CMOS) ont facilité l'usage des traitements de signaux numériques (DSP) dans les systèmes de transmission optique. Grâce au retour en force du système de transmission optique cohérent ces dernières années, les systèmes de transmission optique régis par logiciel et supportés par les traitements de signaux numériques ont mené la transition fondamentale des réseaux optique inflexible vers des réseaux optique robuste, reconfigurable, prêt à brancher et utiliser.Depuis peu, le format de modulation par multiplexage fréquentiel orthogonale en optique cohérente (CO-OFDM) est profondément étudier comme format de modulation particu-lièrement prometteur pour réaliser des systèmes de transmission cohérents. Malgré le fait que les CO-OFDM aient réussi à susciter un grand intérêt dans la communauté de recherche, ils leur restent encore à avoir un impact plus tangible dans le secteur commercial. Ce non-déploiement commercial est attribué aux difficultés d'implémentations, notamment à l'information superflue excessive nécessaire et à la susceptibilité accrue aux nonlinéarités de la fibre optique et aux bruits de fréquence et de phase.Cette thèse explore certaines idées de DSP pour des systèmes de transmission CO-OFDM, incluant deux contributions originales. La première étant un égalisateur de canaux à adaptation dirigée par décision (ADDCE) qui vise à réduire l'information superflue nécessaire aux systèmes de transmission CO-OFDM. ADDCE récupère une estimation de la valeur du bruit de phase après un stage initiale de décision en extrayant et en moyennant la dérive de phase de tout les sous-canaux OFDM, ce qui démontre une compensation du bruit de phase sans information superflue. De plus, cela ajourne la matrice de transfère du canal optique symbole par symbole, offrant une réduction de l'information excédante associés avec les symboles pilotes. La seconde contribution de cette thèse se concentre sur la mitiga-tion de l'interférence inter-canaux (ICI) induite par le bruit de phase du laser dans les systèmes CO-OFDM. Ce compensateur de ICI basé sur l'interpolation estime le bruit de phase des échantillons dans le temps en utilisant une interpolation linéaire entre les estimations d'erreur de phase commune (CPE) de symboles OFDM consécutifs. Les performances des algorithmes d'égalisations appliqués en DSP mentionnés ci-haut sont étudiées en simulations et expérimentalement dans un système de transmission en CO-OFDM sur double polarisation à intervalle de garde réduite (RGI-DP-CO-OFDM), ce qui démontre une performance supérieure vis-à-vis de l'égalisateur conventionnel (CEs). Plus encore, l'analyse de la complexité des algorithmes d'égalisateurs proposées sera fournit; confirmant une implémentation à faible complexité.
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森, 正和. "反射戻り光が動的単一モード半導体レーザのモード分配特性に及ぼす影響の研究." 1993. http://hdl.handle.net/2237/12987.

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Book chapters on the topic "Noise induced coherence"

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Freund, Jan A., Alexander Neiman, and Lutz Schimansky-Geier. "Stochastic resonance and noise-induced phase coherence." In Stochastic Climate Models, 309–23. Basel: Birkhäuser Basel, 2001. http://dx.doi.org/10.1007/978-3-0348-8287-3_14.

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Borchgrevink, H. M. "Concept — Reference Coherence in Speech Perception: Consequences for Native and Second Language Speech Comprehension in Noise." In Basic and Applied Aspects of Noise-Induced Hearing Loss, 357–67. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4684-5176-4_26.

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Jia, Yanbing, and Huaguang Gu. "Phase Noise-Induced Transition from Single Coherence Resonance to Double Coherence Resonances in a Neuronal Model." In Advances in Cognitive Neurodynamics (V), 867–72. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0207-6_117.

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Gong, Shichao, Bo Peng, Daijun Chen, Yongqiang Tang, and Pengfei Wang. "Diagnosis of Road-Induced Drumming Noise of Passenger Car Based on Multiple Coherence Method." In Lecture Notes in Electrical Engineering, 737–48. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9718-9_57.

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Mullins, J. M., T. A. Litovitz, and C. J. Montrose. "The Role of Coherence in Electromagnetic Field-Induced Bioeffects: The Signal-to-Noise Dilemma." In Electromagnetic Fields, 319–38. Washington, DC: American Chemical Society, 1995. http://dx.doi.org/10.1021/ba-1995-0250.ch018.

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LeBerre, Martine, Elisabeth Ressayre, and Andrée Tallet. "Delayed Feedback Acting as Noise to Induce Phase Transitions." In Coherence and Quantum Optics VI, 653–57. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0847-8_120.

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O'Callaghan, Casey. "Processes." In A Multisensory Philosophy of Perception, 19–52. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198833703.003.0002.

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Crossmodal perceptual illusions such as ventriloquism, the McGurk effect, the rubber hand, and the sound-induced flash demonstrate that one sense can causally impact perceptual processing and experience that is associated with another sense. This chapter argues that such causal interactions between senses are not merely accidental. Interactions between senses are part of typical perceptual functioning. Unlike synesthesia, they reveal principled perceptual strategies for dealing with noisy, fallible sensory stimulation from multiple sources. Recalibrations resolve conflicts between senses and weight in deference to the more reliable modality. Coordination between senses thus improves the coherence and the reliability of human perceptual capacities. Therefore, some perceptual processes of the sort relevant to empirical psychology are multisensory.
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Conference papers on the topic "Noise induced coherence"

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Saurabh, Aditya, Lipika Kabiraj, Richard Steinert, and Christian Oliver Paschereit. "Noise-Induced Dynamics in the Subthreshold Region in Thermoacoustic Systems." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57442.

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This article is a report of experiments conducted in order to investigate the role of noise on thermoacoustic systems. In contrast to most studies in this direction, in the present work, the role of noise in the subthreshold region, prior to the (subcritical) Hopf bifurcation and the associated saddle-node bifurcation is considered. Although, in this regime, a thermoacoustic system is stable and does not undergo transition to self-excited thermoacoustic oscillations, the system can feature dynamics that arise due to the proximity of the system to the approaching Hopf bifurcation in response to noise. Experiments were performed on a model thermoacoustic system featuring a laminar flat flame. Noise was introduced in a controlled manner and the effect of increasing levels of noise intensity was studied. Results presented here show that noise addition induces coherent oscillations. The induced coherence can be quite significant, and is dependent on the noise amplitude and proximity to the Hopf bifurcation. Furthermore, this noise-induced behavior is characterized by a well-defined ‘resonance-like’ response of the system: An optimum level of coherence is induced for an intermediate level of noise. For practical thermoacoustic systems (e.g. combustors), which are inherently noisy due to factors such as flow turbulence and combustion noise, these results can have important implications.
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Luo, Zeju, and Lihong Song. "Coherence Resonance in Noise-Induced Excitable Systems." In 2008 Fourth International Conference on Natural Computation. IEEE, 2008. http://dx.doi.org/10.1109/icnc.2008.922.

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Nikoghosyan, Gor, Michael Fleischhauer, Matthew D. Eisaman, and Mikhail D. Lukin. "Quantum Noise of Single-Photon Sources Based on Electromagnetically Induced Transparency." In Conference on Coherence and Quantum Optics. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/cqo.2007.cmi24.

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Meucci, R. "Evidence of Noise Induced Synchronization and Coherence Resonance in Homoclinic Chaos." In EXPERIMENTAL CHAOS: 7th Experimental Chaos Conference. AIP, 2003. http://dx.doi.org/10.1063/1.1612198.

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Hui, Guohua. "Noise-Induced Double Coherence Resonance in Leaky Integrate-and-Fire Neuron Array." In 2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE 2010). IEEE, 2010. http://dx.doi.org/10.1109/icbbe.2010.5515503.

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Li, Hua, Jun Ye, and John G. McInerney. "Influence of noise on deterministic chaos in a coherence-collapsed semiconductor laser." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.fe5.

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Semiconductor injection lasers are frequently operated in external cavities for spectral narrowing and mode stabilization. However, the external cavity laser can exhibit coherence collapse, a catastrophic broadening of the spectral linewidth to tens of gigahertz under moderate external feedback.1 For fundamental and practical reasons, one needs to know whether this behavior is stochastic (noise-driven) or deterministic. Here we describe experimental and theoretical studies of the coherence-collapsed semiconductor laser. Our experiments have used GaAs/GaAlAs index-guided lasers (Hitachi HLP-1400), operated from 1.1–1.5 times threshold and coupled to long (10–60 cm), weakly coupled (~10-3–10-4 in intensity) linear external cavities. The theoretical analyses of these experiments are based on rate equations for the carrier density and complex optical field; phase-amplitude coupling, gain saturation and coherent feedback terms are included. These equations are integrated for the free-running laser and the coherence-collapsed laser with and without noise terms: the time series, return map, autocorrelation function, power spectrum and correlation dimension are calculated in each case. The results show that the coherence-collapsed state is chaotic, with a correlation dimension of ~2.5, and the most likely explanation is mixing between external cavity mode partition fluctuations and feedback induced relaxation oscillations. The addition of noise tends to obscure the finer features of the chaotic attractor and makes the correlation dimension more difficult to determine.
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7

El-Samad, Hana, and Mustafa Khammash. "Coherence Resonance: A Mechanism for Noise Induced Stable Oscillations in Gene Regulatory Networks." In Proceedings of the 45th IEEE Conference on Decision and Control. IEEE, 2006. http://dx.doi.org/10.1109/cdc.2006.377181.

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8

Smithey, D. T., M. Belsley, K. Wedding, and M. G. Raymer. "Near quantum-limited phase memory in an optical amplifier." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.thr3.

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Probing the quantum noise level with respect to a coherent input has recently received much attention. Several researchers have probed this question by examining the level of external optical input needed to influence the output field of a quantum noise amplifier. For example, it has been found that it takes, on average, about one photon per (temporal) mode to control the phase of the output field of a Raman amplifier.1 A similar result has been seen in optical parametric amplification.2 In contrast to using light to seed the amplification, we have investigated the level of initial molecular coherence needed to control the phase of the output field of a Raman amplifier. Two laser pulses, separated in time, were used to pump a common set of hydrogen molecules producing two Stokes pulses via stimulated Raman scattering. The relative phase of the two Stokes pulses was measured interferometrically. The variance of this relative phase is a direct measure of the memory of the molecular coherence that was induced by the first scattering process. Correlations between the two Stokes phases were observed even after nine molecular dephasing times, when the level of coherence had decayed by a factor of e−9. We show that this extraordinarily long-lived phase memory comes about because a molecular coherence corresponding to order ten vibrational photons per mode is sufficient to influence the phase of the output field.
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Privman, Vladimir, and Dmitry Solenov. "Coherence and entanglement in two-qubit dynamics: interplay of the induced exchange interaction and quantum noise due to thermal bosonic environment." In Defense and Security Symposium, edited by Eric J. Donkor, Andrew R. Pirich, and Howard E. Brandt. SPIE, 2007. http://dx.doi.org/10.1117/12.717685.

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Hamakawa, Hiromitsu, Yuji Kouno, and Eiichi Nishida. "Effect of Fins on Vortex Shedding Noise Generated From a Circular Cylinder in Cross Flow." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30290.

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In the present paper, the effect of twist-serrated fins around a bare tube on the Aeolian tone was experimentally investigated. These fins were mounted spirally around a bare tube and had the same geometry as those actually used in boiler tubes. We measured the intensity of velocity fluctuation, spectrum of velocity fluctuation, coherence of Karman vortex in the spanwise direction, dynamic lift force, and sound pressure level of the aerodynamic noise generated from finned tubes with various fin pitches. An Aeolian tone induced by Karman vortex shedding was observed in the case of a finned tube, although the complicated fin was mounted around a bare tube. A decrease in the pitch of the fin effectively caused an increase in the equivalent diameter, which acted as the characteristic length of a cylinder with fins. The equivalent diameter depended on the Reynolds number. We modified a relation to calculate the characteristic diameter of the finned tube, which in turn was used to calculate the Strouhal number. The coherent scales in the spanwise direction for the cases with various fin pitches were slightly larger than that of a simple circular cylinder. It is known that the sound pressure level of the Aeolian tone depends on the coherent scale of the Karman vortex in the spanwise direction. However, when the pitch of the fins decreased, the peak level of the sound pressure spectrum decreased. A correlation analysis between the flow field and Aeolian tone was carried out.
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