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Journal articles on the topic 'Coherence time'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Le, Thai-Hoa, and Dong-Anh Nguyen. "TEMPORO-SPECTRAL COHERENT STRUCTURE OF TURBULENCE AND PRESSURE USING FOURIER AND WAVELET TRANSFORMS." ASEAN Journal on Science and Technology for Development 25, no. 2 (2017): 405–17. http://dx.doi.org/10.29037/ajstd.271.

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Studying the spatial distribution in coherent fields such as turbulent and turbulent-induced force ones is important to model and evaluate turbulent-induced forces and response of structures on the turbulent flows. Turbulent field-based coherent function is commonly used for the spatial distribution characteristic of induced forces in the frequency domain. This paper will focus to study spectral coherent structure of turbulence and forces in not only the frequency domain using conventional Fourier transform-based coherence, but also temporo-spectral coherent one in the time-frequency plane tha

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2

Kobayashi, Yuki, and Stephen R. Leone. "Characterizing coherences in chemical dynamics with attosecond time-resolved x-ray absorption spectroscopy." Journal of Chemical Physics 157, no. 18 (2022): 180901. http://dx.doi.org/10.1063/5.0119942.

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Coherence can drive wave-like motion of electrons and nuclei in photoexcited systems, which can yield fast and efficient ways to exert materials’ functionalities beyond the thermodynamic limit. The search for coherent phenomena has been a central topic in chemical physics although their direct characterization is often elusive. Here, we highlight recent advances in time-resolved x-ray absorption spectroscopy (tr-XAS) to investigate coherent phenomena, especially those that utilize the eminent light source of isolated attosecond pulses. The unparalleled time and state sensitivities of tr-XAS in

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GÜLERCE, MUSTAFA, and GAZANFER ÜNAL. "FORECASTING OF OIL AND AGRICULTURAL COMMODITY PRICES: VARMA VERSUS ARMA." Annals of Financial Economics 12, no. 03 (2017): 1750012. http://dx.doi.org/10.1142/s2010495217500129.

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The aim of this paper is to show that the estimates made with vector autoregressive–moving-average (ARMA) models based on the coherent time intervals of the multiple time series give more precise results than the univariate case. The previous literature on dynamic correlations (co-movement) in between food and energy prices has mixed results and mainly based on parametric approaches. Therefore, partial wavelet coherence (PWC) and multiple wavelet coherence (MWC) methods are used, respectively, to uncover the coherency simultaneously for time and frequency domains. In our study; world oil, corn

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Ma, Tian, and Erik M. Bollt. "Shape Coherence and Finite-Time Curvature Evolution." International Journal of Bifurcation and Chaos 25, no. 05 (2015): 1550076. http://dx.doi.org/10.1142/s0218127415500765.

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We introduce a definition of finite-time curvature evolution along with our recent study on shape coherence in nonautonomous dynamical systems. Comparing to slow evolving curvature preserving the shape, large curvature growth points reveal the dramatic change on shape such as the folding behaviors in a system. Closed trough curves of low finite-time curvature (FTC) evolution field indicate the existence of shape coherent sets, and troughs in the field indicate the most significant shape coherence. Here, we will demonstrate these properties of the FTC, as well as contrast to the popular Finite-

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Villarroya-Carpio, Arturo, and Juan M. Lopez-Sanchez. "Multi-Annual Evaluation of Time Series of Sentinel-1 Interferometric Coherence as a Tool for Crop Monitoring." Sensors 23, no. 4 (2023): 1833. http://dx.doi.org/10.3390/s23041833.

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Interferometric coherence from SAR data is a tool used in a variety of Earth observation applications. In the context of crop monitoring, vegetation indices are commonly used to describe crop dynamics. The most frequently used vegetation indices based on radar data are constructed using the backscattered intensity at different polarimetric channels. As coherence is sensitive to the changes in the scene caused by vegetation and its evolution, it may potentially be used as an alternative tool in this context. The objective of this work is to evaluate the potential of using Sentinel-1 interferome

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Schwickert, David, Marco Ruberti, Přemysl Kolorenč, et al. "Charge-induced chemical dynamics in glycine probed with time-resolved Auger electron spectroscopy." Structural Dynamics 9, no. 6 (2022): 064301. http://dx.doi.org/10.1063/4.0000165.

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In the present contribution, we use x-rays to monitor charge-induced chemical dynamics in the photoionized amino acid glycine with femtosecond time resolution. The outgoing photoelectron leaves behind the cation in a coherent superposition of quantum mechanical eigenstates. Delayed x-ray pulses track the induced coherence through resonant x-ray absorption that induces Auger decay. Temporal modulation of the Auger electron signal correlated with specific ions is observed, which is governed by the initial electronic coherence and subsequent vibronic coupling to nuclear degrees of freedom. In the

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7

Kohles, N., P. Aechtner, and A. Laubereau. "The “coherence peak” in time-resolved coherent Raman scattering." Optics Communications 65, no. 5 (1988): 391–96. http://dx.doi.org/10.1016/0030-4018(88)90110-1.

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Naik, Dinesh N., Takahiro Ezawa, Yoko Miyamoto, and Mitsuo Takeda. "Real-time coherence holography." Optics Express 18, no. 13 (2010): 13782. http://dx.doi.org/10.1364/oe.18.013782.

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Wang, L. J., X. Y. Zou, and L. Mandel. "Time-varying induced coherence." Journal of the Optical Society of America B 9, no. 4 (1992): 605. http://dx.doi.org/10.1364/josab.9.000605.

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10

Xiang, Wei, Rui Zhang, Guoxiang Liu, et al. "Saline-Soil Deformation Extraction Based on an Improved Time-Series InSAR Approach." ISPRS International Journal of Geo-Information 10, no. 3 (2021): 112. http://dx.doi.org/10.3390/ijgi10030112.

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Significant seasonal fluctuations could occur in the regional scattering characteristics and surface deformation of saline soil, and cause decorrelation, which limits the application of the conventional time-series InSAR (TS-InSAR). For extending the saline-soil deformation monitoring capability, this paper presents an improved TS-InSAR approach, based on the interferometric coherence statistics and high-coherence interferogram refinement. By constructing a network of the refined interferograms, high-accuracy ground deformation can be extracted through the weighted least square estimation and

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11

Zhang, Xuan, Yahong Chen, Fei Wang, and Yangjian Cai. "Scattering of Partially Coherent Vector Beams by a Deterministic Medium Having Parity-Time Symmetry." Photonics 9, no. 3 (2022): 140. http://dx.doi.org/10.3390/photonics9030140.

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We study the scattering properties of the partially coherent vector beams with the deterministic media having the classic symmetric and parity-time (PT) symmetric scattering potential functions. The closed-form expressions for the intensity and polarization matrix of the far-zone scattered field are obtained, under first-order Born approximation, when the partially coherent vector beams are taken to be radially polarized and the deterministic media are assumed as the four-point scatterers. We demonstrate both analytically and numerically that the far-zone scattered field becomes noncentrosymme

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12

Privalsky, V. "On studying relations between time series in climatology." Earth System Dynamics 6, no. 1 (2015): 389–97. http://dx.doi.org/10.5194/esd-6-389-2015.

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Abstract. Relationships between time series are often studied on the basis of cross-correlation coefficients and regression equations. This approach is generally incorrect for time series, irrespective of the cross-correlation coefficient value, because relations between time series are frequency-dependent. Multivariate time series should be analyzed in both time and frequency domains, including fitting a parametric (preferably, autoregressive) stochastic difference equation to the time series and then calculating functions of frequency such as spectra and coherent spectra, coherences, and fre

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Privalsky, V. "On studying relations between time series in climatology." Earth System Dynamics Discussions 6, no. 1 (2015): 699–718. http://dx.doi.org/10.5194/esdd-6-699-2015.

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Abstract. In climatology, relationships between time series are often studied on the basis of crosscorrelation coefficients and regression equations. This approach is generally incorrect for time series irrespective of the crosscorrelation coefficient value because relations between time series are frequency-dependent. Multivariate time series should be analyzed in both time and frequency domains, including fitting a parametric (preferably, autoregressive) stochastic difference equation to the time series and then calculating functions of frequency such as spectra and coherent spectra, coheren

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Shen, Peng, Changcheng Wang, and Jun Hu. "A Polarization Stacking Method for Optimizing Time-Series Interferometric Phases of Distributed Scatterers." Remote Sensing 14, no. 17 (2022): 4168. http://dx.doi.org/10.3390/rs14174168.

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For time-series interferometric phases optimization of distributed scatterers (DSs), the SqueeSAR technology used the phase linking (PL) to extract the equivalent single-master (ESM) interferometric phases from the multilooking time-series coherence matrix. The Cramer–Rao lower bound (CRLB) for the PL describes the highest achievable estimation accuracy of the ESM phases, which depends on the number of looks and the time-series coherence magnitude matrix. With the abundance of time-series polarimetric SAR data, many scholars have studied the coherence magnitude-based polarimetric optimization

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Simmons, James A., Kelsey N. Hom, and Andrea Megela Simmons. "Temporal coherence of harmonic frequencies affects echo detection in the big brown bat, Eptesicus fuscus." Journal of the Acoustical Society of America 154, no. 5 (2023): 3321–27. http://dx.doi.org/10.1121/10.0022444.

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Echolocating big brown bats (Eptesicus fuscus) broadcast frequency modulated (FM) ultrasonic pulses containing two prominent harmonic sweeps (FM1, FM2). Both harmonics typically return as echoes at the same absolute time delay following the broadcast, making them coherent. Electronically splitting FM1 and FM2 allows their time delays to be controlled separately, making them non-coherent. Earlier work shows that big brown bats discriminate coherent from split harmonic, non-coherent echoes and that disruptions of harmonic coherence produce blurry acoustic images. A psychophysical experiment on t

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Chen, Ziyang, Xudong Chen, Jixiong Pu, and Sabino Chávez-Cerda. "Generation of partially coherent beams with controllable time-dependent coherence." Optical Engineering 56, no. 12 (2017): 1. http://dx.doi.org/10.1117/1.oe.56.12.124110.

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17

Cohen, M. I., A. D. Miller, R. Barnhardt, and C. F. Shaw. "Weakness of short-term synchronization among respiratory nerve activities during fictive vomiting." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 263, no. 2 (1992): R339—R347. http://dx.doi.org/10.1152/ajpregu.1992.263.2.r339.

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In decerebrate, paralyzed cats, phrenic (PHR) and lumbar abdominal (ABD) nerve discharges during both neural respiration and fictive vomiting (FV) were subjected to spectral and coherence analyses. During respiration, PHR discharge exhibited high-frequency oscillation (HFO), manifested as a narrow spectral peak (range 57-90 Hz) in autospectra and left-right coherence spectra. During FV, the following occurred: 1) the HFO peak disappeared and was replaced by a broad peak with higher modal frequency (range 84-120 Hz), indicating elimination of inputs from the medullary inspiratory pattern genera

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18

YAKOVLEV, D. R., A. GREILICH, M. BAYER, and I. A. YUGOVA. "ELECTRON SPIN COHERENCE IN SINGLY CHARGED QUANTUM DOTS." International Journal of Modern Physics B 23, no. 12n13 (2009): 2813–25. http://dx.doi.org/10.1142/s0217979209062396.

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Electron spin coherence is examined experimentally and theoretically in singly charged ( In , Ga ) As / GaAs quantum dots. Time-resolved pump-probe Faraday rotation technique is used to examine fine structure and Zeeman splitting of excitons and resident electrons. Spin dephasing and spin coherence times of resident electrons have been measured in the regime of mode-locking of spin coherency.

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19

Jaeger, Gary. "Building Practical Coherence over Time." Southwest Philosophy Review 27, no. 1 (2011): 111–17. http://dx.doi.org/10.5840/swphilreview201127112.

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20

Carter, G. C. "Coherence and time delay estimation." Proceedings of the IEEE 75, no. 2 (1987): 236–55. http://dx.doi.org/10.1109/proc.1987.13723.

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21

Vidybida, A. K. "Neuron as time coherence discriminator." Biological Cybernetics 74, no. 6 (1996): 537–42. http://dx.doi.org/10.1007/bf00209424.

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Vidybida, A. K. "Neuron as time coherence discriminator." Biological Cybernetics 74, no. 6 (1996): 537–42. http://dx.doi.org/10.1007/s004220050264.

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23

Zhao, Xiaowei, Shangxu Wang, Sanyi Yuan, Cuiyun Xu, and Tieyi Wang. "An efficient and robust scheme for the implementation of eigenstructure-based coherency algorithms." GEOPHYSICS 85, no. 5 (2020): O97—O108. http://dx.doi.org/10.1190/geo2019-0623.1.

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The coherence attribute has been widely used to detect faults and channels as well as other structural and stratigraphic discontinuities since its introduction. Currently, the most commonly used algorithm for coherence computation is the eigenstructure-based coherence method (C3). When seismic data are of a low signal-to-noise ratio, more traces should be involved in coherence computation to improve the robustness to noise; thus, a larger analysis window shall be used. However, this will lead to increased time costs and blurred coherence images. To address these issues, we have adopted a modif

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24

Li, Shuang, Jia-Dong Shi, Wen-Yang Sun, Dong Wang, and Liu Ye. "Coherence of two-level atoms within cavity QED." Modern Physics Letters B 31, no. 35 (2017): 1750330. http://dx.doi.org/10.1142/s0217984917503304.

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In this work, we investigate the dynamics of the coherence of two atoms trapped in one cavity with resonance and large detuned characters, respectively. By means of tracing over the freedom of the cavity, the evolution coherent state can be obtained. Subsequently, the coherence within the two different scenarios is discussed. Remarkably, an interesting result is obtained as the coherence can be enhanced to a large extent in the framework of large detuning. Besides, we find that there exists a distinctive phenomenon of recovery of the coherence with the interaction time of atom–cavity.

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25

Katz, Or, Roy Shaham, and Ofer Firstenberg. "Coupling light to a nuclear spin gas with a two-photon linewidth of five millihertz." Science Advances 7, no. 14 (2021): eabe9164. http://dx.doi.org/10.1126/sciadv.abe9164.

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Nuclear spins of noble gases feature extremely long coherence times but are inaccessible to optical photons. Here, we realize a coherent interface between light and noble-gas spins that is mediated by alkali atoms. We demonstrate the optical excitation of the noble-gas spins and observe the coherent back action on the light in the form of high-contrast two-photon spectra. We report on a record two-photon linewidth of 5 ± 0.7 mHz above room temperature, corresponding to a 1-min coherence time. This experiment provides a demonstration of coherent bidirectional coupling between light and noble-ga

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26

Dare, Tyler, and Sean Collier. "Interpretation and use of coherence in multi-channel measurements." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 269, no. 1 (2024): 1373–82. http://dx.doi.org/10.3397/nc_2024_0181.

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The coherence function can be a powerful tool when analyzing data from multi-channel measurements. Often, coherence is used to describe the amount of incoherent noise in an output signal, though more generally the coherence between two signals is a representation of the linearity of the relationship between the signals as a function of frequency. Such degradation in the coherence then can be understood to not only be caused by potential incoherent noise, but also by moving sensors or a changing acoustic environment. Aside from its use as a diagnostic tool, coherence can also be used to conditi

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Vanaken, Lauranne, Patricia Bijttebier, Robyn Fivush, and Dirk Hermans. "An investigation of the concurrent and longitudinal associations between narrative coherence and mental health mediated by social support." Journal of Experimental Psychopathology 13, no. 1 (2022): 204380872110682. http://dx.doi.org/10.1177/20438087211068215.

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The coherence of autobiographical narratives is thought to be reflective of individuals’ psychological adjustment. However, results are not always replicable, the longitudinal nature of the relation has remained largely unaddressed, and there is limited research on mechanisms that may explain the relation between coherence and mental health. Therefore, in a large longitudinal study, we investigated the concurrent and prospective associations of narrative coherence with mental health, as well as mediational effects of perceived social support. Concurrently, correlations showed that total narrat

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Smith, Sarah R., Erin Driscoll, and Mark Bocko. "Understanding the coherence properties of musical vibrato signals." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A288. http://dx.doi.org/10.1121/10.0023550.

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In the field of optics, coherence theory is used to characterize the relative correlation of optical fields at different points in space and time. While this framework has found fewer applications in acoustics outside of an imaging context, recent work has explored the possibility of characterizing rooms and other acoustical systems based on the coherence properties of naturally occurring reverberant sounds. Additionally, the cross-correlation functions used in coherence theory also underly many auditory perceptual models which leverage interaural correlations to estimate interaural time diffe

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PUSEP, Y. A., M. B. RIBEIRO, H. ARAKAKI, C. A. DE SOUZA, S. MALZER, and G. H. DÖHLER. "DISORDER INDUCED COHERENCE-INCOHERENCE CROSSOVER IN RANDOM GaAs/AlGaAs SUPERLATTICES." International Journal of Modern Physics B 18, no. 27n29 (2004): 3629–32. http://dx.doi.org/10.1142/s0217979204027165.

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The coherence of electrons was studied in intentionally disordered GaAs / AlGaAs superlattices as a function of the vertical interlayer coupling. Depending on the relation of the disorder energy and the Fermi energy the coherent and incoherent diffusive transport regimes were distinguished. New features of weakly coupled layered electron systems such as the vertical coupling energy and the in-plane phase-breaking time were observed by magnetoresistance measurements in the coherent and incoherent regimes respectively. Both of them were found to decrease with increasing disorder strength. This d

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Porter, Tim, and Jim Stasheff. "Homotopy Coherent Representations." Symmetry 14, no. 3 (2022): 553. http://dx.doi.org/10.3390/sym14030553.

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Homotopy coherence has a considerable history, albeit also by other names. For this volume highlighting symmetries, the appropriate use is homotopy coherence of representations, at one time known as representations up to homotopy/homotopy coherent representations. We present a brief semi-historical survey, providing some links that may not be common knowledge.

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Chaouachi, Nizar, and Sihem Jaziri. "Possibility of observation quantum beat coherent exciton states with time-resolved photoemission." Journal of Applied Physics 131, no. 15 (2022): 155704. http://dx.doi.org/10.1063/5.0086440.

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We develop a theoretical study to evaluate the dynamic of the time-resolved photoemission spectrum arising from the dissociation of exciton steady-states 1s, 2s in a monolayer transition metal dichlacogenides. We discuss the dielectric environment effect on the exciton binding energies. Quantum beat signatures in photoemission intensity demonstrate coherent coupling between 1s and 2s excitons. The beating contribution due to excitonic coherence is also discussed. The periodic oscillations arising from coherent superposition states and quantum beats enable exploration of novel coherent phenomen

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Neupane, Sujaya, Daniel Guitton, and Christopher C. Pack. "Coherent alpha oscillations link current and future receptive fields during saccades." Proceedings of the National Academy of Sciences 114, no. 29 (2017): E5979—E5985. http://dx.doi.org/10.1073/pnas.1701672114.

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Oscillations are ubiquitous in the brain, and they can powerfully influence neural coding. In particular, when oscillations at distinct sites are coherent, they provide a means of gating the flow of neural signals between different cortical regions. Coherent oscillations also occur within individual brain regions, although the purpose of this coherence is not well understood. Here, we report that within a single brain region, coherent alpha oscillations link stimulus representations as they change in space and time. Specifically, in primate cortical area V4, alpha coherence links sites that en

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Graf, Robert N., and Adam Wax. "Temporal coherence and time-frequency distributions in spectroscopic optical coherence tomography." Journal of the Optical Society of America A 24, no. 8 (2007): 2186. http://dx.doi.org/10.1364/josaa.24.002186.

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Palato, Samuel, Hélène Seiler, Parmeet Nijjar, Oleg Prezhdo, and Patanjali Kambhampati. "Atomic fluctuations in electronic materials revealed by dephasing." Proceedings of the National Academy of Sciences 117, no. 22 (2020): 11940–46. http://dx.doi.org/10.1073/pnas.1916792117.

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The microscopic origin and timescale of the fluctuations of the energies of electronic states has a significant impact on the properties of interest of electronic materials, with implication in fields ranging from photovoltaic devices to quantum information processing. Spectroscopic investigations of coherent dynamics provide a direct measurement of electronic fluctuations. Modern multidimensional spectroscopy techniques allow the mapping of coherent processes along multiple time or frequency axes and thus allow unprecedented discrimination between different sources of electronic dephasing. Ex

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Кулаковский, В. Д., та А. А. Деменев. "Динамика когерентности экситон-поляритонной системы в GaAs-микрорезонаторах при импульсном резонансном фотовозбуждении". Физика и техника полупроводников 53, № 10 (2019): 1343. http://dx.doi.org/10.21883/ftp.2019.10.48287.33.

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AbstractIt is found that exciton-polariton systems resonantly excited in GaAs semiconductor microcavities by coherent picosecond laser pulses inherit the high coherence of the laser beam and retain it for their lifetime (>100 ps), while the coherence-formation time in polariton systems resonantly excited by incoherent pulses without excitation of the exciton reservoir exceeds 200 ps.

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Kay, Leslie M., and Philip Lazzara. "How Global Are Olfactory Bulb Oscillations?" Journal of Neurophysiology 104, no. 3 (2010): 1768–73. http://dx.doi.org/10.1152/jn.00478.2010.

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Previous studies in waking animals have shown that the frequency structure of olfactory bulb (OB) local field potential oscillations is very similar across the OB, but large low-impedance surface electrodes may have favored highly coherent events, averaging out local inhomogeneities. We tested the hypothesis that OB oscillations represent spatially homogeneous phenomena at all scales. We used pairs of concentric electrodes (200 μm outer shaft surrounding an inner 2–3 μm recording site) beginning on the dorsal OB at anterior and medial locations in urethane-anesthetized rats and measured local

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Li, Qing, Kris Vasudevan, and Frederick A. Cook. "3-D coherency filtering." GEOPHYSICS 62, no. 4 (1997): 1310–14. http://dx.doi.org/10.1190/1.1444232.

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Coherency filtering is a tool used commonly in 2-D seismic processing to isolate desired events from noisy data. It assumes that phase‐coherent signal can be separated from background incoherent noise on the basis of coherency estimates, and coherent noise from coherent signal on the basis of different dips. It is achieved by searching for the maximum coherence direction for each data point of a seismic event and enhancing the event along this direction through stacking; it suppresses the incoherent events along other directions. Foundations for a 2-D coherency filtering algorithm were laid ou

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Yeo, Chang-Yeon, Mun-Hwan Choi, Byoung-Jin Kim, and Sung-Hyun Choi. "Coherence Time Estimation for Performance Improvement of IEEE 802.11n Link Adaptation." Journal of Korean Institute of Communications and Information Sciences 36, no. 3A (2011): 232–39. http://dx.doi.org/10.7840/kics.2011.36a.3.232.

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DOLAN, KEVIN T. "SURROGATE ANALYSIS OF MULTICHANNEL DATA WITH FREQUENCY DEPENDANT TIME LAG." Fluctuation and Noise Letters 04, no. 01 (2004): L75—L81. http://dx.doi.org/10.1142/s0219477504001677.

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Recently a new technique for generating linear surrogates of multichannel data was introduced. This technique, referred to as the coherent digitally filtered surrogate method, preserves both the individual power spectra, and the coherence function, of the original data. This method is somewhat limited in that it can only be applied to multichannel data in which the cross-spectrum is real. We present here an alteration to this algorithm that can be used to test any linear-correlation model, with arbitrary complex cross-spectra. This is of particular interest for experiments in which two channel

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Yang, Xiao-Song, and Tiantian Wu. "A Note on Phase Coherence of Chaotic Sets." International Journal of Bifurcation and Chaos 26, no. 14 (2016): 1650243. http://dx.doi.org/10.1142/s0218127416502436.

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The phase coherence phenomenon of chaotic motion is unique to continuous time dynamical systems and of significance in many disciplines such as nonlinear physics and biology. In this paper, we present a geometric description of phase coherence of chaotic motion and show that chaotic sets near a homoclinic orbit or heteroclinic cycle are phase coherent in this geometric setting under a mild condition.

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Matsuya, Ryosuke, Junichi Ushiyama та Junichi Ushiba. "Prolonged reaction time during episodes of elevated β-band corticomuscular coupling and associated oscillatory muscle activity". Journal of Applied Physiology 114, № 7 (2013): 896–904. http://dx.doi.org/10.1152/japplphysiol.00942.2012.

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Oscillatory activity in the sensorimotor cortex is coherent with 15–35 Hz band (β-band) muscle activity during tonic isometric voluntary contractions. In human subjects with higher corticomuscular coherence, prominent grouped discharge associated with a significant silent period was observed in electromyographic (EMG) signals. We examined the potential effects of β-band corticomuscular coupling on new ballistic movement as assessed by reaction time (RT). First, we quantified the coherence between electroencephalographic (EEG) signals over the sensorimotor cortex and rectified EMG signals from

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Mustafa, Armin, and Adrian Hilton. "Semantically Coherent 4D Scene Flow of Dynamic Scenes." International Journal of Computer Vision 128, no. 2 (2019): 319–35. http://dx.doi.org/10.1007/s11263-019-01241-w.

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Abstract Simultaneous semantically coherent object-based long-term 4D scene flow estimation, co-segmentation and reconstruction is proposed exploiting the coherence in semantic class labels both spatially, between views at a single time instant, and temporally, between widely spaced time instants of dynamic objects with similar shape and appearance. In this paper we propose a framework for spatially and temporally coherent semantic 4D scene flow of general dynamic scenes from multiple view videos captured with a network of static or moving cameras. Semantic coherence results in improved 4D sce

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Lin, Mengying, Yimei Luo, Xuefen Zhu, Gangyi Tu, and Zhengpeng Lu. "Optimal GPS Acquisition Algorithm in Severe Ionospheric Scintillation Scene." Electronics 12, no. 6 (2023): 1343. http://dx.doi.org/10.3390/electronics12061343.

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The Global Positioning System (GPS) plays an important role in navigation and positioning services. When GPS signals propagate through a complex space environment, they are susceptible to interference of ionospheric scintillation. As one of the biggest interference sources on GPS navigation and positioning, ionospheric scintillation will lead to signal intensity decline and carrier phase fluctuation, making signal acquisition of the GPS receiver challenging. Thus, an acquisition algorithm based on differential coherent integration combining accumulation correlation and bit sign transition esti

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Zhu, Chenyang, Sai Geetha Seri, Hamed Mohebbi-Kalkhoran, and Purnima Ratilal. "Long-Range Automatic Detection, Acoustic Signature Characterization and Bearing-Time Estimation of Multiple Ships with Coherent Hydrophone Array." Remote Sensing 12, no. 22 (2020): 3731. http://dx.doi.org/10.3390/rs12223731.

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Three approaches for instantaneous wide-area analysis of ship-radiated underwater sound, each focusing on a different aspect of that sound, received on a large-aperture densely-sampled coherent hydrophone array have been developed. (i) Ship’s narrowband machinery tonal sound is analyzed via temporal coherence using Mean Magnitude-Squared Coherence (MMSC) calculations. (ii) Ship’s broadband amplitude-modulated cavitation noise is examined using Cyclic Spectral Coherence (CSC) analysis that provides estimates for propeller blade pass rotation frequency, shaft rotation frequency, and hence the nu

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Stajic, Jelena. "Extending the coherence time of molecules." Science 357, no. 6349 (2017): 366.10–368. http://dx.doi.org/10.1126/science.357.6349.366-j.

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Davis, John, and William Tango. "Measurement of the Atmospheric Coherence Time." Publications of the Astronomical Society of the Pacific 108 (May 1996): 456. http://dx.doi.org/10.1086/133747.

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Wang, Xiu-qing. "The coherence time of polar slab." Canadian Journal of Physics 96, no. 2 (2018): 213–15. http://dx.doi.org/10.1139/cjp-2017-0272.

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The relationship among the coherence time τ, variation frequency λ, slab thickness d, energy separation ΔE, and coupling constant α in polar slab was investigated using Pekar-type variational method. The results indicated that the τ is positively proportional to the λ, but the ΔE, d and α are negatively correlated with the τ. When ΔE is more than 10 eV, and d is less than 5 nm, τ decreases sharply.

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Dong, Yao, Ai-Ling Ji, and Guo-Feng Zhang. "Evolution of quantum coherence of qutrit-qutrit system under correlated depolarizing channels." Acta Physica Sinica 71, no. 7 (2022): 070303. http://dx.doi.org/10.7498/aps.71.20212067.

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In order to study the decoherence process of quantum system and find the ways to delay it, in this paper we investigate the decoherence process under correlated depolarizing channels by calculating the evolution of norm coherence, relative entropy coherence and basis-independent coherence of the three initial states: special initial state, maximum coherent state and isotropic state. From the analytic results, numerical results and evolution images, it can be found that 1) completely correlated channels can suppress decoherence to a greatest extent,. 2) the time point at which maximum decoheren

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Zhou, Fan, Chen Pan, Lintao Ma, et al. "SLOTH: Structured Learning and Task-Based Optimization for Time Series Forecasting on Hierarchies." Proceedings of the AAAI Conference on Artificial Intelligence 37, no. 9 (2023): 11417–25. http://dx.doi.org/10.1609/aaai.v37i9.26350.

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Multivariate time series forecasting with hierarchical structure is widely used in real-world applications, e.g., sales predictions for the geographical hierarchy formed by cities, states, and countries. The hierarchical time series (HTS) forecasting includes two sub-tasks, i.e., forecasting and reconciliation. In the previous works, hierarchical information is only integrated in the reconciliation step to maintain coherency, but not in forecasting step for accuracy improvement. In this paper, we propose two novel tree-based feature integration mechanisms, i.e., top-down convolution and bottom

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Akeju, Oluwaseun, M. Brandon Westover, Kara J. Pavone, et al. "Effects of Sevoflurane and Propofol on Frontal Electroencephalogram Power and Coherence." Anesthesiology 121, no. 5 (2014): 990–98. http://dx.doi.org/10.1097/aln.0000000000000436.

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Abstract Background: The neural mechanisms of anesthetic vapors have not been studied in depth. However, modeling and experimental studies on the intravenous anesthetic propofol indicate that potentiation of γ-aminobutyric acid receptors leads to a state of thalamocortical synchrony, observed as coherent frontal alpha oscillations, associated with unconsciousness. Sevoflurane, an ether derivative, also potentiates γ-aminobutyric acid receptors. However, in humans, sevoflurane-induced coherent frontal alpha oscillations have not been well detailed. Methods: To study the electroencephalogram dyn

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