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Journal articles on the topic 'Coherency interval'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Gülerce, Mustafa, and Gazanfer Ünal. "Electricity price forecasting using multiple wavelet coherence method: Comparison of ARMA versus VARMA." International Journal of Financial Engineering 05, no. 01 (2018): 1850004. http://dx.doi.org/10.1142/s2424786318500044.

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The aim of this paper is to bring out a new perspective for Electricity price forecasting. Numerous studies have focused on forecasting the day-ahead or long-term price forecasting of electricity, rather than examine the relationship between energy commodities, by using various methods. Therefore, this study proposes a model-free approach for electricity price forcasting (EPF). The proposed approach is based on Partial Wavelet Coherency (PWC) and Multiple Wavelet Coherency (MWC) method. These methods are capable of uncovering the coherent time intervals simultaneously for time and frequency do

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2

Khoirunnisa, Hanah, Ulung Jantama Wisha, and Muhammad Zainuddin Lubis. "The Coherency and Correlation between Sea Surface Temperature and Wind Velocity in Malacca Strait: Cross Wavelet Transform and Wavelet Coherency Application." Journal of Geoscience, Engineering, Environment, and Technology 2, no. 3 (2017): 210. http://dx.doi.org/10.24273/jgeet.2017.2.3.590.

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This study tried to observe the correlation and coherency between sea surface temperature (SST) and wind velocity in the Malacca Strait at the year of 2015. The SST and wind velocity data with 6 hours interval step have been used in this study. S-Transform, the Cross Wavelet Transform, and the Wavelet Coherency were applied to observe the influence of the variation of sea surface temperature to the wind velocity in Malacca Strait. These methods could produce the phase lag and the time of occurrence between them. S-Transform was used to show the spectrum energy of the sea surface temperature va

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Agrez, Dusan. "Estimation of the signal component from random equivalent and non-coherent sampling measurements." ACTA IMEKO 6, no. 4 (2017): 54. http://dx.doi.org/10.21014/acta_imeko.v6i4.474.

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Estimations of the signal component parameters in the case of random equivalent time sampling and under non-coherent sampling condition comprise two main error contributions: spectral leakage effect due to non-coherency and additional noise due to the randomization of sampling intervals. In the estimation procedure the non-parametric interpolated DFT approach has to be used first to estimate the component frequency and, after that, an iterative 4-parametric sine-fit algorithm should be used for other component parameters (amplitude and phase). Their estimations are possible when the duty ratio

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Hou, D. H., S. M. Liang, Rong Shi Chen, En Hou Han, and C. Dong. "Thermal Analysis during Solidification of Mg-4%.wtAl Alloy during Lost Foam Casting Process." Materials Science Forum 686 (June 2011): 371–77. http://dx.doi.org/10.4028/www.scientific.net/msf.686.371.

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The lost foam casting (LFC) process utilizes the expanded polystyrene (EPS) foam pattern for the production of metallic components. The thermal degradation of the foam pattern has a significant effect on microstructure of the component. Dendrite coherency is important for the determination of the formation of the solidification structure and cast ability of alloys. The effects of the dendrite coherency on grain size in Mg-4Al alloy have been studied using the two-thermocouple thermal analysis technique in the solidified sample. The results also indicate that the grain size increases with the t

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5

Baxter, Laurence A. "Continuum structures. II." Mathematical Proceedings of the Cambridge Philosophical Society 99, no. 2 (1986): 331–38. http://dx.doi.org/10.1017/s0305004100064240.

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AbstractA continuum structure function is a nondecreasing mapping from the unit hypercube to the unit interval. This paper continues the author's work on the subject, extending Griffith's definitions of coherency to such functions and studying the analytic properties of a continuum structure function based on Natvig's ‘second suggestion’.

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Sapra, S. K. "Coherency Conditions in a Simultaneous Equations Model with an Interval-Censored Endogenous Variable." Econometric Theory 13, no. 4 (1997): 605. http://dx.doi.org/10.1017/s0266466600006046.

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Timotius, Hagayudha, and Yulinar Firdaus. "QUALITY IMPROVEMENT OF SEISMIC IMAGE FROM 2D PSDM (PRE STACK DEPTH MIGRATION) USING TOMOGRAPHY FOR INTERVAL VELOCITY MODEL REFINEMENT." BULLETIN OF THE MARINE GEOLOGY 28, no. 2 (2016): 43. http://dx.doi.org/10.32693/bomg.28.2.2013.59.

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The main goal of seismic exploration is to get an accurate image of subsurface section so it can be easily interpreted. Pre Stack Depth Migration (PSDM) is such a powerful imaging tool especially for complex area such an area where strong lateral velocity variations exist. The main challenge of PSDM is the need of accurate interval velocity model.In this research, Dix Transformation, coherency inversion, and tomography are used for initial interval velocity model, and then tomography is used for interval velocity model refinement. We compare also between seismic image resulted from PSDM and PS

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Jarvis, M. R., and P. P. Mitra. "Sampling Properties of the Spectrum and Coherency of Sequences of Action Potentials." Neural Computation 13, no. 4 (2001): 717–49. http://dx.doi.org/10.1162/089976601300014312.

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The spectrum and coherency are useful quantities for characterizing the temporal correlations and functional relations within and between point processes. This article begins with a review of these quantities, their interpretation, and how they may be estimated. A discussion of how to assess the statistical significance of features in these measures is included. In addition, new work is presented that builds on the framework established in the review section. This work investigates how the estimates and their error bars are modified by finite sample sizes. Finite sample corrections are derived

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Lin, Zhenzhi, Yuxuan Zhao, Shengyuan Liu, et al. "A New Indicator of Transient Stability for Controlled Islanding of Power Systems: Critical Islanding Time." Energies 11, no. 11 (2018): 2975. http://dx.doi.org/10.3390/en11112975.

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Transient stability after islanding is of crucial importance because a controlled islanding strategy is not feasible if transient stability cannot be maintained in the islands created. A new indicator of transient stability for controlled islanding strategies, defined as the critical islanding time (CIT), is presented for slow coherency-based controlled islanding strategies to determine whether all the islands created are transiently stable. Then, the stable islanding interval (SII) is also defined to determine the appropriate time frame for stable islanding. Simulations were conducted on the

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Biondi, Biondo. "Velocity estimation by beam stack." GEOPHYSICS 57, no. 8 (1992): 1034–47. http://dx.doi.org/10.1190/1.1443315.

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Imaging seismic data requires detailed knowledge of the propagation velocity of compressional waves in the subsurface. In conventional seismic processing, the interval velocity model is usually derived from stacking velocities. Stacking velocities are determined by measuring the coherency of the reflections along hyperbolic moveout trajectories in offset. This conventional method becomes inaccurate in geologically complex areas because the conversion of stacking velocities to interval velocities assumes a horizontally stratified medium and mild lateral variations in velocity. The tomographic v

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Kebaili, Ahmed, and Douglas R. Schmitt. "Velocity anisotropy observed in wellbore seismic arrivals: Combined effects of intrinsic properties and layering." GEOPHYSICS 61, no. 1 (1996): 12–20. http://dx.doi.org/10.1190/1.1443932.

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A method of estimating velocity anisotropy by the τ-p inversion of seismic traveltimes observed in a multi‐depth and offset VSP experiment is developed. In the method, a set of seismic traces observed at a fixed depth in the wellbore are transformed to the τ-p domain. Incidence‐angle‐dependent interval velocities are extracted from the resulting curves using coherency measures after accounting for the effects of the overlaying layers. To test the method, we obtained seismic records from a shallow borehole drilled through a flat lying sedimentary sequence. One depth interval that consists of a

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12

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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Thore, Pierre D., Eric de Bazelaire, and Marisha P. Rays. "The three‐parameter equation: An efficient tool to enhance the stack." GEOPHYSICS 59, no. 2 (1994): 297–308. http://dx.doi.org/10.1190/1.1443592.

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We compare the three‐term equation to the normal moveout (NMO) equation for several synthetic data sets to analyze whether or not it is worth making the additional computational effort in the stacking process within various exploration contexts. In our evaluation we have selected two criteria: 1)The quality of the stacked image. 2) The reliability of the stacking parameters and their usefulness for further computation such as interval velocity estimation. We have simulated the stacking process very precisely, despite using only the traveltimes and not the full waveform data. The procedure sear

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Lee, Doo Sung, Spyros K. Lazaratos, Gregory N. Fitzgerald, and Takashi Imayoshi. "High‐resolution crosswell seismic experiment with a large interwell spacing in a west Texas carbonate field." GEOPHYSICS 60, no. 3 (1995): 727–34. http://dx.doi.org/10.1190/1.1443811.

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A high‐frequency crosswell seismic dataset acquired in a west Texas carbonate field has demonstrated the feasibility of the technique with a large interwell spacing. Two crosswell profiles were acquired with a well spacing of 1500 ft (460 m) and over a depth interval from 7700 ft (2350 m) to 9600 ft (2930 m) using a piezoelectric bender source. The data quality is profile and depth dependent, with the ambient noise level at the receiver position being the most important factor. Noise levels and noise characteristics among three wells were significantly different. Tube waves and gas‐ and fluid‐

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Abbad, Brahim, Bjørn Ursin, and Didier Rappin. "Automatic nonhyperbolic velocity analysis." GEOPHYSICS 74, no. 2 (2009): U1—U12. http://dx.doi.org/10.1190/1.3075144.

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The stacking of long-offset seismic data requires a nonhyperbolic traveltime function that depends on two-way traveltime, normal moveout (NMO) velocity and effective anellipticity. Based on a standard fractional approximation, a new parameterization in slowness-squared parameters provides optimal sampling of the NMO velocity and anellipticity. The automatic nonhyperbolic velocity analysis is performed with a normalized bootstrapped differential semblance (BDS) coherency estimator that leads to enhanced resolution in velocity spectra compared to differential semblance. Reflection wavelet center

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Özgül, Ercan, Hasan Dinçer, and Serhat Yüksel. "HoQ-based evaluation of UHC competencies using an extension of interval-valued spherical fuzzy and hesitant 2-tuple linguistic term sets." Journal of Intelligent & Fuzzy Systems 40, no. 6 (2021): 11671–89. http://dx.doi.org/10.3233/jifs-202818.

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Healthy life is recognized as one of the most fundamental human rights. However, even today, millions of people around the world are forced to choose between their basic needs and fundamental rights. Half of the world’s population does not have access to the healthcare they need. Universal Health Coverage (UHC) aims to ensure that all individuals receive the quality health services they need without incurring a financial burden, and to protect them from risk factors that threaten their health. The aim of this study is to identify the significant factors to improve UHC in the countries. For thi

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Imran, Qazi Sohail, Numair A. Siddiqui, Abdul Halim Abdul Latiff, et al. "Automated Fault Detection and Extraction under Gas Chimneys Using Hybrid Discontinuity Attributes." Applied Sciences 11, no. 16 (2021): 7218. http://dx.doi.org/10.3390/app11167218.

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3D-seismic data have increasingly shifted seismic interpretation work from a horizons-based to a volume-based focus over the past decade. The size of the identification and mapping work has therefore become difficult and requires faster and better tools. Faults, for instance, are one of the most significant features of subsurface geology interpreted from seismic data. Detailed fault interpretation is very important in reservoir characterization and modeling. The conventional manual fault picking is a time-consuming and inefficient process. It becomes more challenging and error-prone when deali

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Lellouch, Ariel, Siyuan Yuan, William L. Ellsworth, and Biondo Biondi. "Velocity‐Based Earthquake Detection Using Downhole Distributed Acoustic Sensing—Examples from the San Andreas Fault Observatory at Depth." Bulletin of the Seismological Society of America 109, no. 6 (2019): 2491–500. http://dx.doi.org/10.1785/0120190176.

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Abstract Conventional seismographic networks sparsely sample the wavefields excited by earthquakes. Thus, standard event detection is conducted by analyzing separate stations and merging their results. Emerging distributed acoustic sensing recording technologies allow for unbiased spatial sampling of the wavefield and, as a result, array‐based processing of the recorded signals. Using a cemented fiber in the San Andreas Fault Observatory at Depth main hole, 800 virtual receivers are sampled at a 1 m interval from the surface to 800 m depth. Recorded earthquakes are approximated as plane waves

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Pokorný, Jan, Jiří Pokorný, and Jan Vrba. "Generation of Electromagnetic Field by Microtubules." International Journal of Molecular Sciences 22, no. 15 (2021): 8215. http://dx.doi.org/10.3390/ijms22158215.

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The general mechanism of controlling, information and organization in biological systems is based on the internal coherent electromagnetic field. The electromagnetic field is supposed to be generated by microtubules composed of identical tubulin heterodimers with periodic organization and containing electric dipoles. We used a classical dipole theory of generation of the electromagnetic field to analyze the space–time coherence. The structure of microtubules with the helical and axial periodicity enables the interaction of the field in time shifted by one or more periods of oscillation and gen

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Pickering, Andy, Matthew Alford, Jonathan Nash, et al. "Structure and Variability of Internal Tides in Luzon Strait." Journal of Physical Oceanography 45, no. 6 (2015): 1574–94. http://dx.doi.org/10.1175/jpo-d-14-0250.1.

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AbstractThe Luzon Strait is the generation region for strong internal tides that radiate westward into the South China Sea and eastward into the western Pacific. Intrusions of the Kuroshio and strong mesoscale variability in the Luzon Strait can influence their generation and propagation. Here, the authors use eight moorings and two numerical models to investigate these relationships by quantifying the coherence of the diurnal and semidiurnal internal tides in the Luzon Strait. This study finds that the level of coherence of internal tide generation, energy, and energy flux is quite variable,

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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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Van den Aardweg, J. G., R. P. van Steenwijk, and J. M. Karemaker. "A chemoreflex model of relation between blood pressure and heart rate in sleep apnea syndrome." American Journal of Physiology-Heart and Circulatory Physiology 268, no. 5 (1995): H2145—H2156. http://dx.doi.org/10.1152/ajpheart.1995.268.5.h2145.

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In obstructive sleep apnea syndrome (OSAS), pronounced low-frequency (LF) oscillations of blood pressure and interbeat interval (I) occur during recurrent apneas. We investigated the time relations between LF oscillations of diastolic pressure (D) and I in 12 patients with OSAS by means of spectral analysis. A high coherency between I and D was found, allowing a description of the relation by gain and phase. Oscillations in I and D were almost in counterphase in the LF range. Simple physiological models were implemented to interpret the observed features of LF oscillations. Model 1 describes t

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Zaitsu, Shin-ichi, Takumi Tanabe, Kota Oshima, and Hiroyuki Hirata. "Theoretical Analysis of a Molecular Optical Modulator for a Continuous-Wave Laser Based on a Hollow-Core Photonic Crystal Fiber." Applied Sciences 8, no. 10 (2018): 1895. http://dx.doi.org/10.3390/app8101895.

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A THz optical modulator for a continuous-wave laser using a hollow-core photonic crystal fiber (HC-PCF) was proposed and theoretically analyzed. Lightwaves traveling through the HC-PCF is modulated by interactions with coherently driven Raman-active molecules in the core. The coherent molecular motion is excited by a pulse train having an interval between successive pulses shorter than the molecular dephasing time. In principle, a rotational transition of molecular hydrogen (S 0 (1)) at a pressure of 1 atm has a long enough dephasing time to maintain molecular coherence during a 1 GHz commerci

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Pevzner, Roman, Boris Gurevich, and Milovan Urosevic. "Estimation of azimuthal anisotropy from VSP data using multicomponent S-wave velocity analysis." GEOPHYSICS 76, no. 5 (2011): D1—D9. http://dx.doi.org/10.1190/geo2010-0290.1.

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Observation of azimuthal shear wave anisotropy can be useful for characterization of fractures or stress fields. Shear wave anisotropy is often estimated by measuring splitting of individual shear wave events in vertical seismic profile (VSP) data. However, this method may become unreliable for zero-offset (marine) VSP where the seismogram often contains no strong individual shear events, such as direct downgoing shear wave, but often contains many low-amplitude PS mode converted waves. We have developed a new approach for estimation of the fast and slow shear wave velocities and orientation o

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SHUAI, J. W., S. ZENG, and P. JUNG. "COHERENCE RESONANCE: ON THE USE AND ABUSE OF THE FANO FACTOR." Fluctuation and Noise Letters 02, no. 03 (2002): L139—L146. http://dx.doi.org/10.1142/s0219477502000749.

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Coherence resonance describes a phenomenon in excitable systems in which a suitable dose of noise generates excitation-events that maximizes its periodicity or coherence. The Fano-factor, defined as the ratio of the standard deviation of the time-intervals between successive events and the average time interval, exhibits a minimum at this optimal noise level. It is shown here that a decreasing Fano factor is a necessary but not a sufficient criterion to indicate enhanced coherence of a signal.

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RANDALL, SUMMER LOCKERBIE, ANATOL M. BRODSKY, and LLOYD W. BURGESS. "MANIFESTATION OF MIE RESONANCES IN COHERENT LIGHT BACKSCATTERING FROM RANDOM MEDIA." Modern Physics Letters B 19, no. 04 (2005): 181–88. http://dx.doi.org/10.1142/s0217984905008190.

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Utilization of Optical Low Coherence Reflectometry (OLCR) for measurement of coherent backscattering of light from media with randomly-distributed spherical particles shows the influence of Mie resonances over the parameter interval where particle radii are comparable to the wavelength of light. Results advance the understanding of the theoretically and practically important problem of wave propagation in multiscattering random media.

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Zhao, Qiang, Qizhen Du, Xufei Gong, Xiangyang Li, Liyun Fu, and Yangkang Chen. "Normalized shaping regularization for robust separation of blended data." GEOPHYSICS 84, no. 5 (2019): V281—V293. http://dx.doi.org/10.1190/geo2018-0557.1.

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Simultaneous source acquisition has attracted more and more attention from geophysicists because of its cost savings, whereas it also brings some challenges that have never been addressed before. Deblending of simultaneous source data is usually considered as an underdetermined inverse problem, which can be effectively solved with a least-squares (LS) iterative procedure between data consistency ([Formula: see text]-norm) and regularization ([Formula: see text]-norm or [Formula: see text]-norm). However, when it comes to abnormal noise that follows non-Gaussian distribution and possesses high-

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Stępień, Adam. "Internal Contradictions and External Anxieties: One ‘Coherent’ Arctic Policy for the European Union?" Yearbook of Polar Law Online 7, no. 1 (2015): 249–89. http://dx.doi.org/10.1163/2211-6427_011.

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The European Union’s overarching policy towards the Arctic is an umbrella policy of complementary and coordination nature composed of internal, external and foreign policy elements. This article examines the policy framework from the perspective of ‘coherence’. What could a coherent and integrated EU Arctic policy entail – as called for by the Council and the European Parliament? I problematise the notion of coherence and offer an understanding of coherence deemed workable in the context of a regionfocused policy-making. Different dimensions of coherence are discussed: internal (lack of contra

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Volvach, A., and G. Kurbasova. "MODEL OF INSOLATION OF THE EARTH SURFACE IN THE KARA-DAG LOCALITY ACCORDING TO SSE DATA." Visnyk of Taras Shevchenko National University of Kyiv. Geology, no. 2 (85) (2019): 51–58. http://dx.doi.org/10.17721/1728-2713.85.07.

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Anomalous enhancement of solar insolation of the earth's surface in the presence of foci of excitation in its depths can cause a response at local sites. Such foci include, first of all, recent and past (retro) volcanoes, such as the ancient volcano on the territory of Kara-Dag in the Crimea. The authors of this article have found increased, in comparison with other localities of the Crimea, general insolation according to SSE. According to the 22-year linear trend, the rate of insolation growth falling on the earth's surface at Kara-Dag has been calculated, which is 2,69 kWh/m2 per century, b

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Gülerce, Mustafa, and Gazanfer Ünal. "Using wavelet analysis to uncover the co-movement behavior of multiple energy commodity prices." International Journal of Wavelets, Multiresolution and Information Processing 14, no. 06 (2016): 1650047. http://dx.doi.org/10.1142/s0219691316500478.

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This study aims to investigate the dynamic correlations (co-movement) in between energy commodities such as WTI Crude Oil (WOIL), Brent Crude Oil (BOIL), Heating Oil and Electricity prices. To achieve this goal, we employed partial wavelet coherence (PWC) and multiple wavelet coherence (MWC). Wavelet analysis constitutes the core of these methodologies and MWC is essential to determine the dynamic correlation (co-movement) of time intervals and scales between the time series. We have developed a software program to compute PWC and MWC for quadruple data set. Coherent time intervals of the time

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Musthafa, M., G. Singh, and U. Khati. "DETECTION OF FOREST DISTURBANCE USING TANDEM-X POL-INSAR COHERENCE." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-5 (November 19, 2018): 295–97. http://dx.doi.org/10.5194/isprs-archives-xlii-5-295-2018.

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<p><strong>Abstract.</strong> This current study shows the potential of TanDEM-X pol-InSAR coherence to identify progressive selective logging of Teak plantation in Uttarakhand, India. Pol-InSAR data were acquired over four months with 11 days interval with perpendicular baseline varying from 111 to 689<span class="thinspace"></span>m. Progressive selective logging of mature teak plantation from January to February was analyzed using time-series pol-InSAR coherences. The results shows the baseline selection critical for forest change studies. TanDEM-X derived pol-

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Kocsis, B., G. L. Gebber, S. M. Barman, and M. J. Kenney. "Relationships between activity of sympathetic nerve pairs: phase and coherence." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 259, no. 3 (1990): R549—R560. http://dx.doi.org/10.1152/ajpregu.1990.259.3.r549.

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The coherence function and phase spectrum were used to study the relationships between the discharges of sets of two postganglionic or preganglionic sympathetic nerves in baroreceptor-denervated cats anesthetized with either 5,5-diallylbarbiturate-urethan or alpha-chloralose. Most of the power in sympathetic nerve discharge was contained between 2 and 6 Hz. The coherence values relating the activity of two nerves were significantly different from zero within this frequency band. The phase spectrum was either linear or complex (i.e., showed changes in slope) within the coherent frequency band.

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Kim, Seong-Hu, and Yong-Hwa Park. "Interaural Coherence Estimation for Speech Processing in Reverberant Environment." Applied Sciences 10, no. 3 (2020): 769. http://dx.doi.org/10.3390/app10030769.

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Interaural coherence is used to quantify the effects of reverberation on speech, and previous studies applied the conventional method using all previous time data in the form of an infinite impulse response filter to estimate interaural coherence. To consider a characteristic of speech that continuously changes over time, this paper proposes a new method of estimating interaural coherence using time data within a finite length of speech, which is called the quasi-steady interval. The length of the quasi-steady interval is determined with various frequency bands, reverberation times, and short-

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Kelly, Samuel M., Nicole L. Jones, Gregory N. Ivey, and Ryan J. Lowe. "Internal-Tide Spectroscopy and Prediction in the Timor Sea." Journal of Physical Oceanography 45, no. 1 (2015): 64–83. http://dx.doi.org/10.1175/jpo-d-14-0007.1.

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AbstractSpectral analyses of two 3.5-yr mooring records from the Timor Sea quantified the coherence of mode-0 (surface) and mode-1 (internal) tides with the astronomical tidal potential. The noncoherent tides had well-defined variance and were most accurately quantified for tidal species (as opposed to constituents) in long records (>6 months). On the continental slope (465 m), the semidiurnal mode-0 and mode-1 velocity and mode-1 pressure variance were 95%, 68%, and 56% coherent, respectively. On the continental shelf (145 m), the semidiurnal mode-0 and mode-1 velocity and mode-1 pressure

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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 (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 incr

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Mancia, Giuseppe, Gianfranco Parati, Paolo Castiglioni, and Marco di Rienzo. "Effect of sinoaortic denervation on frequency-domain estimates of baroreflex sensitivity in conscious cats." American Journal of Physiology-Heart and Circulatory Physiology 276, no. 6 (1999): H1987—H1993. http://dx.doi.org/10.1152/ajpheart.1999.276.6.h1987.

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In animals and humans, baroreceptor modulation of the sinus node in daily life can be studied by identification of the number of sequences in which systolic blood pressure (SBP) and pulse interval (PI) linearly decrease or increase for several beats. It is also studied by power spectral analysis of SBP and PI in regions where their powers are coherent, although, in contrast to the sequence method, whether this frequency-domain method specifically reflects the baroreceptor-heart rate reflex has not been adequately tested. We recorded intra-arterial BP for ∼3.5 h in eight conscious cats, first i

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Mastorakos, Ioannis N., Firas E. Akasheh, and Hussein M. Zbib. "Treating internal surfaces and interfaces in discrete dislocation dynamics." Journal of the Mechanical Behaviour of Materials 20, no. 1-3 (2011): 13–20. http://dx.doi.org/10.1515/jmbm.2011.002.

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AbstractThe treatment of coherent interfaces and cracks is discussed in the framework of dislocation dynamics (DD). In the case of interfaces, we use DD to study dislocation interactions in nanoscale bimetallic laminates, and to predict their structure after relaxation and during loading. In agreement with experimental observations, our discrete dynamics simulations show that dislocation structure develops only at the interface between coherent layers leaving layers’ interior dislocation-free. The main dislocation mechanism at this length scale is Oworan bowing of threading dislocations confin

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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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Boyashov, Anatoly. "Coherence of European Union Actions at the UN Human Rights Council and the Council of Europe." MGIMO Review of International Relations, no. 3(66) (July 28, 2019): 159–75. http://dx.doi.org/10.24833/2071-8160-2019-3-66-159-175.

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The current methodological debates on the EU external actions at international organisations raise the issue of the EU coherence. The scholarship tends to focus on EU vertical and horizontal coherence in various policies, making the EU internal coordination central in the analysis. Neither horizontal nor vertical EU coherence leads to understanding why the EU is accused of “double standards”. Little research explores the external contestation as a pivotal matter of the EU effectiveness, performance, actorness. It appears promising to make the EU action coherent over various multilateral bodies

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Vigeesh, G., and M. Roth. "Synthetic observations of internal gravity waves in the solar atmosphere." Astronomy & Astrophysics 633 (January 2020): A140. http://dx.doi.org/10.1051/0004-6361/201936846.

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Aims. We study the properties of internal gravity waves (IGWs) detected in synthetic observations that are obtained from realistic numerical simulation of the solar atmosphere. Methods. We used four different simulations of the solar magneto-convection performed using the CO5BOLD code. A magnetic-field-free model and three magnetic models were simulated. The latter three models start with an initial vertical, homogeneous field of 10, 50, and 100 G magnetic flux density, representing different regions of the quiet solar surface. We used the NICOLE code to compute synthetic spectral maps from al

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Abernathey, Ryan, and George Haller. "Transport by Lagrangian Vortices in the Eastern Pacific." Journal of Physical Oceanography 48, no. 3 (2018): 667–85. http://dx.doi.org/10.1175/jpo-d-17-0102.1.

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AbstractRotationally coherent Lagrangian vortices (RCLVs) are identified from satellite-derived surface geostrophic velocities in the eastern Pacific (180°–130°W) using the objective (frame invariant) finite-time Lagrangian coherent structure detection method of Haller et al. based on the Lagrangian-averaged vorticity deviation. RCLVs are identified for 30-, 90-, and 270-day intervals over the entire satellite dataset, beginning in 1993. In contrast to structures identified using Eulerian eddy-tracking methods, the RCLVs maintain material coherence over the specified time intervals, making the

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Lunden, Anya. "Syllable weight and duration: A rhyme/intervals comparison." Proceedings of the Linguistic Society of America 2 (June 12, 2017): 33. http://dx.doi.org/10.3765/plsa.v2i0.4084.

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Steriade (2012) proposed intervals as a more appropriate syllable weight domain than rhymes. This study explores how interval weight cashes out as duration across word positions and compares this to a rhyme-based account. The data reported on in Lunden (2013), from native speakers of Norwegian (a language in which (C)VC syllables are heavy only non-finally) is reanalyzed with intervals. Lunden found that syllable rhymes in all three positions, if taken as a percentage of the average V rhyme in that word position, fell into a coherent pattern for weight. It is shown that interval durations allo

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Zhao, Zhongxiang, Matthew H. Alford, James B. Girton, Luc Rainville, and Harper L. Simmons. "Global Observations of Open-Ocean Mode-1 M2 Internal Tides." Journal of Physical Oceanography 46, no. 6 (2016): 1657–84. http://dx.doi.org/10.1175/jpo-d-15-0105.1.

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AbstractA global map of open-ocean mode-1 M2 internal tides is constructed using sea surface height (SSH) measurements from multiple satellite altimeters during 1992–2012, representing a 20-yr coherent internal tide field. A two-dimensional plane wave fit method is employed to 1) suppress mesoscale contamination by extracting internal tides with both spatial and temporal coherence and 2) separately resolve multiple internal tidal waves. Global maps of amplitude, phase, energy, and flux of mode-1 M2 internal tides are presented. The M2 internal tides are mainly generated over topographic featur

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Schlueter-Kuck, Kristy L., and John O. Dabiri. "Coherent structure colouring: identification of coherent structures from sparse data using graph theory." Journal of Fluid Mechanics 811 (December 13, 2016): 468–86. http://dx.doi.org/10.1017/jfm.2016.755.

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We present a frame-invariant method for detecting coherent structures from Lagrangian flow trajectories that can be sparse in number, as is the case in many fluid mechanics applications of practical interest. The method, based on principles used in graph colouring and spectral graph drawing algorithms, examines a measure of the kinematic dissimilarity of all pairs of fluid trajectories, measured either experimentally, e.g. using particle tracking velocimetry, or numerically, by advecting fluid particles in the Eulerian velocity field. Coherence is assigned to groups of particles whose kinemati

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Wages, Nolan A., Alexia Iasonos, John O'Quigley, and Mark R. Conaway. "Coherence principles in interval‐based dose finding." Pharmaceutical Statistics 19, no. 2 (2019): 137–44. http://dx.doi.org/10.1002/pst.1974.

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Magny, M., N. Combourieu Nebout, J. L. de Beaulieu, et al. "North–south palaeohydrological contrasts in the central Mediterranean during the Holocene: tentative synthesis and working hypotheses." Climate of the Past Discussions 9, no. 2 (2013): 1901–67. http://dx.doi.org/10.5194/cpd-9-1901-2013.

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Abstract. On the basis of a multi-proxy approach and a strategy combining lacustrine and marine records along a north–south transect, data collected in the Central Mediterranean within the framework of a collaborative project have led to reconstruction of high-resolution and well-dated palaeohydrological records and to assessment of their spatial and temporal coherency. Contrasting patterns of palaeohydrological changes have been evidenced in the Central Mediterranean: south (north) of around 40° N of latitude, the middle part of the Holocene was characterised by lake-level maxima (minima), du

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Fouts, Avery. "Divine Self-Limitation in Swinburne's Doctrine of Omniscience." Religious Studies 29, no. 1 (1993): 21–26. http://dx.doi.org/10.1017/s0034412500022010.

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In his book, The Coherence of Theism, Richard Swinburne seeks to construct a coherent doctrine of God. As a part of this endeavour he examines the idea of omniscience in chapter 10. One of Swinburne's conclusions is that God as an omniscient being must engage in cognitive self-limitation in order to preserve the freedom of both divine and human future actions. In this paper, I want to look at his argument as it is presented in this chapter. I will conclude that Swinburne's position on divine cognitive self-limitation results in an internal contradiction.

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Badra, Leslie J., William H. Cooke, Jeffrey B. Hoag, et al. "Respiratory modulation of human autonomic rhythms." American Journal of Physiology-Heart and Circulatory Physiology 280, no. 6 (2001): H2674—H2688. http://dx.doi.org/10.1152/ajpheart.2001.280.6.h2674.

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We studied the influence of three types of breathing [spontaneous, frequency controlled (0.25 Hz), and hyperventilation with 100% oxygen] and apnea on R-R interval, photoplethysmographic arterial pressure, and muscle sympathetic rhythms in nine healthy young adults. We integrated fast Fourier transform power spectra over low (0.05–0.15 Hz) and respiratory (0.15–0.3 Hz) frequencies; estimated vagal baroreceptor-cardiac reflex gain at low frequencies with cross-spectral techniques; and used partial coherence analysis to remove the influence of breathing from the R-R interval, systolic pressure,

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Kibble, Rodger. "Generating Coherence Relations via Internal Argumentation." Journal of Logic, Language and Information 16, no. 4 (2007): 387–402. http://dx.doi.org/10.1007/s10849-007-9045-2.

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Bondur, V. G., L. N. Zakharova, A. I. Zakharov, T. N. Chimitdorzhiev, A. V. Dmitriev, and P. N. Dagurov. "Monitoring of landslide processes by means of l-band radar interferometric observations: Bureya river bank caving case." Исследования Земли из Космоса, no. 5 (November 5, 2019): 3–14. http://dx.doi.org/10.31857/s0205-9614201953-14.

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The potential of PALSAR-1 (ALOS-1 sat.) and PALSAR-2 (ALOS-2 sat.) L-band radars interferometric observations of the landslide processes is analyzed in this paper with reference to Bureya riverbank landfall occurred in December 2018 when more than 18.5 million m3 of soils crashed into the riverbed. The displacements of the landslide surface were detected and total amplitudes of displacements even on the 2-years time intervals were estimated. Summer images were less informative because of abrupt loss of coherence in the case of heavy precipitations happened during the radar observation. Winter

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