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Journal articles on the topic 'Propagation'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Zheng, Guoliang, Lili Wan, Tiefeng He, Qingyang Wu, and Xuhui Zhang. "The Propagation Characteristics of Circular Airy Beams with Propagational Fractional-Order Optical Vortices." Photonics 11, no. 1 (2024): 64. http://dx.doi.org/10.3390/photonics11010064.

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We investigate the propagation properties of circular Airy beams (CABs) with propagational fractional-order optical vortices (OVs). The superposition of the phase singularity and polarization singularity from a vortex vector beam (VVB) plays a significant role in creating a propagational fractional vortex beam. Propagational fractional vortex beams can be considered as a superposition of left and right circularly polarized vortex beams with different integer topological charges (TCs). We study the propagation characteristics of two kinds of propagational fractional vortex CABs, and the results

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2

Abrame, Andre, and Djamal Habet. "Handling All Unit Propagation Reasons in Exact Max-SAT Solvers." Proceedings of the International Symposium on Combinatorial Search 5, no. 1 (2021): 2–9. http://dx.doi.org/10.1609/socs.v5i1.18313.

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Unit propagation (UP) based method are widely used in Branch and Bound (BnB) Max-SAT solvers for detecting disjoint inconsistent subsets (IS) during the lower bound (LB) estimation. UP consists in assigning to true (propagating) all the literals which appear in unit clauses. The existing implementations of UP only consider the first unit clause causing the assignment of each variable, thus the propagations must be done and undone chronologically to ensure that all the unit clauses are properly exploited. Max-SAT BnB solvers transforms the formulas to ensure IS disjointness. These transformatio

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3

Wang, Bin, Guosen Chen, and Fei Liu. "Diversity of the Madden-Julian Oscillation." Science Advances 5, no. 7 (2019): eaax0220. http://dx.doi.org/10.1126/sciadv.aax0220.

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Madden-Julian Oscillation (MJO) is the dominant mode of atmospheric intraseasonal variability and the cornerstone for subseasonal prediction of extreme weather events. Climate modeling and prediction of MJO remain a big challenge, partially due to lack of understanding the MJO diversity. Here, we delineate observed MJO diversity by cluster analysis of propagation patterns of MJO events, which reveals four archetypes: standing, jumping, slow eastward propagation, and fast eastward propagation. Each type exhibits distinctive east-west asymmetric circulation and thermodynamic structures. Tight co

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Zúñiga-Segundo, A., J. A. Anaya-Contreras, and H. M. Moya-Cessa. "Free-Space Propagation: As Simple as Possible." Journal of Physics: Conference Series 2986, no. 1 (2025): 012015. https://doi.org/10.1088/1742-6596/2986/1/012015.

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Abstract A new technique has been developed for quickly propagating a beam of light through free space. The technique involves using the Fourier transform differential operator to evaluate the quantum propagator. To demonstrate this method, we calculate the effects of displacement and squeeze operators on a given function, as well as the propagation and self-healing of paraxial, Airy, and Pearcey fields.

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Toutain, P. L., P. G. Marnet, M. P. Laurentie, R. Garcia-Villar, and Y. Ruckebusch. "Direction of uterine contractions during estrus in ewes: a reevaluation." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 249, no. 4 (1985): R410—R416. http://dx.doi.org/10.1152/ajpregu.1985.249.4.r410.

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In four ewes direction of propagation of uterine contractions was evaluated using an electromyographic technique during 15 entire estrous periods; 120,101 propagations were analyzed. When horns were considered separately 89.9% of all propagations were classified into three main modes: ascending (34.3%), descending (59.85%), and divergent (5.85%). When both horns were analyzed simultaneously, horn's synchronicity was observed in most instances; on this basis, eight modes of propagation were identified of which three accounted for two-thirds of all propagation: synchronous descending (24.9%), re

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6

Cohen, David, Christopher Jefferson, and Karen Petrie. "A Theoretical Framework for Constraint Propagator Triggering." Proceedings of the International Symposium on Combinatorial Search 7, no. 1 (2021): 19–27. http://dx.doi.org/10.1609/socs.v7i1.18388.

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CSP instances are commonly solved by backtracking search combined with constraint propagation. During search, constraint solvers aim to remove any literals (variable-value pair) that can be shown not to be part of any solution. This literal removal, called propagation, is the beating heart of modern constraint solvers. A significant proportion of the runtime of propagating constraint solvers is spent running propagation algorithms. Therefore any mechanism for reducing how frequently propagators are called leads directly to significant performance improvements. One family of popular techniques

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Stovas, Alexey, Yuriy Roganov, and Vyacheslav Roganov. "Interaction between P, S1 and S2 waves in multilayered periodic monoclinic media at low frequencies." Geophysical Journal International 220, no. 3 (2019): 1947–55. http://dx.doi.org/10.1093/gji/ggz551.

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SUMMARY Application of the Floquet theorem and the matrix propagator method reduces the problem of the plane wave propagation in a periodically layered anisotropic media, to analysis of the properties of stationary envelopes of different wave modes propagating up- and downwards. We analyse the interchanging of stop- and pass-bands and their structure at low frequencies for a periodically layered medium with monoclinic symmetry. The analysis shows the effect of interaction between P,S1 and S2 wave multipliers for stop- and pass-band structure and gives insight into the wave propagation in verti

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Kohles, S. S., J. R. Bowers, A. C. Vailas, and R. Vanderby. "Ultrasonic Wave Velocity Measurement in Small Polymeric and Cortical Bone Specimens." Journal of Biomechanical Engineering 119, no. 3 (1997): 232–36. http://dx.doi.org/10.1115/1.2796085.

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A system was refined for the determination of the bulk ultrasonic wave propagation velocity in small cortical bone specimens. Longitudinal and shear wave propagations were measured using ceramic, piezoelectric 20 and 5 MHz transducers, respectively. Results of the pulse transmission technique were refined via the measurement of the system delay time. The precision and accuracy of the system were quantified using small specimens of polyoxymethylene, polystyrene-butadiene, and high-density polyethylene. These polymeric materials had known acoustic properties, similarity of propagation velocities

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9

Kim, Hyo Jin, Sang Ho Lee, and Moon Kyum Kim. "Prediction of Crack Propagation under Dynamic Loading Conditions by Using the Enhanced Point Collocation Meshfree Method." Key Engineering Materials 324-325 (November 2006): 1059–62. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.1059.

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An efficient and accurate numerical program with enhanced point collocation meshfree method is developed to simulate crack propagation under dynamic loading conditions. The enhanced meshfree method with point collocation formulation and derivative approximation in solids is presented. This study also presents the crack propagation criterion and computation of propagating direction, and the total structure of the numerical program named PCMDYC(Point Collocation Meshfree method for DYnamic Crack propagation). Several examples of crack propagation under dynamic loads are analyzed to simulate the

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Hamabata, Hiromitsu, Tomikazu Namikawa, and Kazuhiro Mori. "The effect of lower-hybrid waves on the propagation of hydromagnetic waves." Journal of Plasma Physics 40, no. 2 (1988): 337–51. http://dx.doi.org/10.1017/s0022377800013313.

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Propagation characteristics of hydromagnetic waves in a magnetic plasma are investigated using the two-plasma fluid equations including the effect of lower-hybrid waves propagating perpendicularly to the magnetic field. The effect of lower-hybrid waves on the propagation of hydromagnetic waves is analysed in terms of phase speed, growth rate, refractive index, polarization and the amplitude relation between the density perturbation and the magnetic-field perturbation for the cases when hydromagnetic waves propagate in the plane whose normal is perpendicular to both the magnetic field and the p

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11

Molas, Roman, Halina Borkowska, and Barbara Sawicka. "Wieloletnie użytkowanie ślazowca pensylwańskiego – wartościowego źródła biomasy." Agronomy Science 76, no. 1 (2021): 97–116. http://dx.doi.org/10.24326/as.2021.1.7.

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Next-generation biomass feedstocks are needed to optimize sustainability in a wide range of soils and climates. Species that has been recently noticed in Europe is Virginia fanpetals (Sida hermaphrodita L. Rusby). A critical question with research of this species is its field propagation. A long-term (2003–2012), field experiment was conducted to determine the impact of propagation method on yields and productivity this species. The hypothesis was higher yields of S. hermaphrodita biomass from vegetative propagations than from generative propagations, also over the long term. On average, from

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Idol, Travis, Adel Youkhana, and Renier Paul Santiago. "Vegetative and micropropagation of leucaena." Tropical Grasslands-Forrajes Tropicales 7, no. 2 (2019): 87–95. http://dx.doi.org/10.17138/tgft(7)87-95.

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Keynote paper presented at the International Leucaena Conference, 1‒3 November 2018, Brisbane, Queensland, Australia.To effectively utilize sterile hybrids of leucaena, efficient protocols for vegetative propagation are needed that meet different user requirements and capabilities. We developed and compared methods for propagating several sterile hybrids of leucaena and compared them with each other and with propagation via seeds for variety K636. Methods included air-layers, rooted cuttings, grafting and tissue culture (micropropagation). All methods required 14‒20 weeks from generation of ne

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Huang, Lian-Jie, and Michael C. Fehler. "Accuracy analysis of the split-step Fourier propagator: Implications for seismic modeling and migration." Bulletin of the Seismological Society of America 88, no. 1 (1998): 18–29. http://dx.doi.org/10.1785/bssa0880010018.

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Abstract The split-step Fourier propagator is a one-way wave propagation method that has been widely used to simulate primary forward and backward (reflected) deterministic/random wave propagation due to its fast computational speed and limited computer memory requirement. The method is useful for rapid modeling of seismic-wave propagation in heterogeneous media where forward scattered waveforms can be considered to be dominant or reverberations can be ignored. The method is based on a solution to the one-way wave equation that requires expanding the square root of an operator and splitting of

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14

Wang, Bin, and Sun-Seon Lee. "MJO Propagation Shaped by Zonal Asymmetric Structures: Results from 24 GCM Simulations." Journal of Climate 30, no. 19 (2017): 7933–52. http://dx.doi.org/10.1175/jcli-d-16-0873.1.

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Abstract Eastward propagation is an essential characteristic of the Madden–Julian oscillation (MJO). Yet, simulation of MJO propagation in general circulation models (GCMs) remains a major challenge and understanding the causes of propagation remains controversial. The present study explores why the GCMs have diverse performances in MJO simulation by diagnosis of 24 GCM simulations. An intrinsic linkage is found between MJO propagation and the zonal structural asymmetry with respect to the MJO convective center. The observed and realistically simulated MJO eastward propagations are characteriz

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15

Yang, Zhen Feng. "Numerical Simulations of Two Four-Petal Gaussian Beams Propagating in Strongly Nonlocal Media." Advanced Materials Research 989-994 (July 2014): 1909–12. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.1909.

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The interaction of two four-petal Gaussian beams propagating in strongly nonlocal nonlinear media is investigated. The results show that the intensity evolution of two beams during their propagation is periodical, which is similar to that of a single beam propagation. However the combined optical field of two beams during propagation is more complicated than that of a single beam. During propagation, the two beams are attracted each other, and at the superposed region of two optical fields, the interference fringes appear. The influences of different beam orders and different input powers on t

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Gong, Guangyu, Rui Duan, and Kunde Yang. "Segmented propagation model for the paths and travel times of surface duct leaky signals." Journal of the Acoustical Society of America 156, no. 3 (2024): 1476–88. http://dx.doi.org/10.1121/10.0028378.

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In the deep ocean environment with a surface duct, sound propagating within the duct leaks into the geometric shadow zone below it. However, the propagation paths and time of these leaky parts have not been fully characterized. This paper investigates the mechanism of surface duct leaky (SDL) signals based on normal mode theory. It reveals that SDL signals are caused by specific modes with grazing angles close to zero at the bottom of the surface duct. Combining the theory of diffracted sound rays, the study proposes a Segmented Propagation model (SPM) for SDL signals. The propagation paths of

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17

TUCCI, ROBERT R. "DIFFRACTION AND SQUEEZED LIGHT." International Journal of Modern Physics B 07, no. 26 (1993): 4403–37. http://dx.doi.org/10.1142/s0217979293003735.

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We discuss the effect of diffraction on squeezed light propagation. All electric fields concerned are approximated to be monochromatic and paraxial. We consider: (1)(propagation without gain) a squeezed signal propagating in free space, and (2)(propagation with gain) a squeezed signal propagating in a non-linear crystal which amplifies the signal by a process of frequency halving (degenerate parametric amplification). The pump beam required for this process is assumed to have a Gaussian amplitude profile. For propagation without gain, our expression for the final signal is exact, but for propa

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Gorbunov, Michael E., Oksana A. Koval, Victor A. Kulikov, and Alexey E. Mamontov. "Method of spherical phase screens for the modeling of propagation of diverging beams in inhomogeneous media." ITM Web of Conferences 30 (2019): 15027. http://dx.doi.org/10.1051/itmconf/20193015027.

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The phase-screen (split-step) method is widely used for the modeling of wave propagation in inhomogeneous media. Most known is the method of flat phase screens. An optimized approach based on cylindrical phase screen was introduced for the 2-D modeling of radio occultation sounding of the Earth’s atmosphere. In this paper, we propose a further generalization of this method for the 3-D problem of propagation of diverging beams. Our generalization is based on spherical phase screens. In the paraxial approximation, we derive the formula for the vacuum screen- to-screen propagator. We also derive

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19

Perviy, Bogdan. "Improving sgp4 orbit propagation." System technologies 6, no. 125 (2019): 76–81. http://dx.doi.org/10.34185/1562-9945-6-125-2019-07.

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The review reflects a comparison between several studies on improving the orbit propagataion accuracy using space objects’ TLE-elements. The study is done to identify a technique that can be applied to enhance the SGP4 model despite increasing the propagation span. The method used in this study is by comparing the techniques that have been used by other researchers for the orbit propagation model. From the review that has been done, a beta regression technique is found to be a suitable technique.

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ANDERSON, A. R. A., and B. D. SLEEMAN. "WAVE FRONT PROPAGATION AND ITS FAILURE IN COUPLED SYSTEMS OF DISCRETE BISTABLE CELLS MODELLED BY FITZHUGH-NAGUMO DYNAMICS." International Journal of Bifurcation and Chaos 05, no. 01 (1995): 63–74. http://dx.doi.org/10.1142/s0218127495000053.

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We discuss wave front propagation and its failure for the discrete FitzHugh-Nagumo system. We show, using a new comparison theorem, that wave front propagation is blocked for d, the coupling coefficient, sufficiently small and propagation must occur for d sufficiently large. Our numerical simulations confirm the analytical findings. We also give a numerical estimate for the speed of propagating waves as a function of d.

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Aoki, Y., T. Matsuyama, Yasuji Oda, Kenji Higashida, and Hiroshi Noguchi. "Effects of Hydrogen Gas Environment on Non-Propagation Phenomena of a Type 304 Austenitic Stainless Steel." Key Engineering Materials 297-300 (November 2005): 927–32. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.927.

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In order to investigate the hydrogen gas effect on non-propagation phenomena of a type 304 austenitic stainless steel, fatigue tests with in-situ observation using a Scanning Laser Microscope were performed in air, in 0.18MPa hydrogen gas and in 0.18MPa nitrogen gas. A nonpropagating crack was observed during the fatigue test in air. At almost the same stress level of non-propagating in air, non-propagating cracks were also observed in fatigue tests in hydrogen and in nitrogen. Stress level of the non-propagation is not sufficiently different in the three environments. However, the process up

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22

Su, Zhiyuan, Mingchu Li, Xinxin Fan, Xing Jin, and Zhen Wang. "Research on Trust Propagation Models in Reputation Management Systems." Mathematical Problems in Engineering 2014 (2014): 1–16. http://dx.doi.org/10.1155/2014/536717.

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Feedback based reputation systems continue to gain popularity in eCommerce and social media systems today and reputation management in large social networks needs to manage cold start and sparseness in terms of feedback. Trust propagation has been widely recognized as an effective mechanism to handle these problems. In this paper we study the characterization of trust propagation models in the context of attack resilience. We characterize trust propagation models along three dimensions: (i) uniform propagation and conditional propagation, (ii) jump strategies for breaking unwanted cliques, and

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Zhao, Wan Chun, Chen Wang, Ting Ting Wang, and Bing Guan. "Calculation Model Study on Damaging Stress of Hydraulically Created Fracture Propagation." Applied Mechanics and Materials 275-277 (January 2013): 238–41. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.238.

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In order to describe hydraulically created fracture propagation’s characteristics of rock matrix exactly, in this paper, establishing a stress field ‘s calculation model of fracturing propagation tip , obtaining numerical method of fracturing propagation’s characteristics based on damaging and describing fracturing propagation’s characteristics combined with method of finite element. Research shows that the corrigendum between stress field ‘s calculation model of fracturing propagation tip and practical engineering are 0.64 percent and 1.43 percent respectively. Compared with the traditional m

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Cheng, Yifeng, Lu Wang, and Tim Li. "Causes of Interdecadal Increase in the Intraseasonal Rainfall Variability over Southern China around the Early 1990s." Journal of Climate 33, no. 21 (2020): 9481–96. http://dx.doi.org/10.1175/jcli-d-20-0047.1.

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AbstractThe southern China (SC) summer rainfall exhibits prominent intraseasonal variability, which exhibits a significant increase in the early 1990s with the turning point at 1993. The SC intraseasonal rainfall events could be divided into three categories according to different propagations, including the southward-propagating (SP) events, the northwestward-propagating (NWP) events, and the northward-propagating (NP) events. This study explores the causes of the observed interdecadal increase in the intraseasonal rainfall variability over SC by comparing the SC intraseasonal rainfall events

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Bakker, Peter M. "A stable one-way wave propagator for VTI media." GEOPHYSICS 74, no. 5 (2009): WB3—WB17. http://dx.doi.org/10.1190/1.3196818.

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For the purpose of one-way wave-equation imaging, a pseudoscreen propagator is developed for transversely isotropic media with vertical axes of symmetry. The phase shift for propagation through a depth slice is decomposed into three terms: a Gazdag phase shift for propagation in a laterally homogeneous reference medium, a correction for lateral variability of vertical propagation, and a remaining wide-angle term for oblique directions of propagation. Based on rational function approximation for this remaining wide-angle term, a Fourier finite-difference (FFD) approach with four-way splitting i

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Jovanoski, Zlatko, and Rowland A. Sammut. "Propagation of Cylindrically Symmetric Gaussian Beams in a Higher-Order Nonlinear Medium." Journal of Nonlinear Optical Physics & Materials 06, no. 02 (1997): 209–34. http://dx.doi.org/10.1142/s0218863597000186.

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The propagation of a cylindrically symmetric Gaussian beam in a cubic-quintic nonlinear medium is analysed via a variational approach. Explicit conditions for stationary beam propagation are determined and their stability to symmetric perturbation of the spot width is established. Approximate analytical solutions are secured for the spot width modulation with propagation distance. A comparison is made with beams propagating in a medium exhibiting a two-level saturation.

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Nian, Fuzhong, Rendong Liu, and Anhui Cong. "An incentive mechanism model based on the correlation between neighbor behavior and distance." International Journal of Modern Physics C 31, no. 11 (2020): 2050161. http://dx.doi.org/10.1142/s0129183120501612.

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In this study, the incentive is defined based on feedback mechanism promoting propagation, and a novel model of behavior propagation is proposed based on feedback mechanism to investigate behavior propagation. In this model, the incentive includes the distance among individuals and the set of state and the influence of node is decided by the incentive and node degree, which explore the propagation effect under different network. The experimental results show the incentive and the propagation have positive correlation, and the propagating effect is determined by the network attribute. At the sa

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Wen, Zhiping, Shutao Peng, Jing Yang, Jun Deng, Hanqing He, and Tong Wang. "Analysis of the Propagation Characteristic of Subsynchronous Oscillation in Wind Integrated Power System." Energies 12, no. 6 (2019): 1081. http://dx.doi.org/10.3390/en12061081.

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This paper proposes oscillation propagation factors to analyze power oscillations caused by the interharmonics of doubly fed induction generators (DFIG) at different points in the power system. First, a dynamic model of the DIFG is built, including the asynchronous generator, its transmission system, converters and the control systems. Then, the state space expression is formed by deducing the input and output matrices. From this, the oscillation propagation factor is proposed and denoted to exhibit the propagation mechanism of interharmonics in the view of frequency domain, by deducing the mu

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Chen, Ge, Xiaoyan Chen, and Chuanchuan Cao. "Divergence and Dispersion of Global Eddy Propagation from Satellite Altimetry." Journal of Physical Oceanography 52, no. 4 (2022): 705–22. http://dx.doi.org/10.1175/jpo-d-21-0122.1.

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Abstract It is well understood that isolated eddies are presumed to propagate westward intrinsically at the speed of the annual baroclinic Rossby wave. This classic description, however, is known to be frequently violated in both propagation speed and its direction in the real ocean. Here, we present a systematic analysis on the divergence of eddy propagation direction (i.e., global pattern of departure from due west) and dispersion of eddy propagation speed (i.e., zonal pattern of departure from Rossby wave phase speed). Our main findings include the following: 1) A global climatological phas

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Yang, Jun Ru, Z. Q. Li, C. Z. Huang, X. F. Wang, and G. C. Wang. "Research on the Propagation of the Crack Inclined across the Interface in the Cermet Cladding Part." Materials Science Forum 697-698 (September 2011): 430–35. http://dx.doi.org/10.4028/www.scientific.net/msf.697-698.430.

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A new comparative propagation property parameter CP suitable to judge the propagation of the interface crack in the cladding part is proposed. The propagation criterion for the crack inclined across the interface is established. The theoretical research on the CPxA and CPxB of this interface crack propagating in the clad and substrate separately is carried out. The propagation law of the interface crack in the cermet cladding part is investigated with an example. The research results show that, within the ranges of the studied parameters, CPxA is bigger than CPxB, and that the crack initially

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Yang, J. R., X. F. Wang, Y. K. Zhang, Z. Q. Li, and C. Z. Huang. "Research on the Propagation of the Crack Parallel to and Lying on the Interface in the Cermet Cladding Part." Advanced Materials Research 426 (January 2012): 287–92. http://dx.doi.org/10.4028/www.scientific.net/amr.426.287.

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Taking the interface crack in the cermet cladding part as the study object, a new comparative propagation property parameter (CPPP) CP suitable to judge the interface crack propagation direction in the cladding part is proposed. The interface crack propagation criterion is established. Based on it, the theoretical research on the parameters (CP1, CP2 and CPi) for the crack parallel to and lying on the interface propagating to the clad, to the substrate, and along the interface is carried out. The interface crack propagation law is investigated with an example. The research results show that th

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Sinha, Bablu, and Brenda Topliss. "A Description of Interdecadal Time-Scale Propagating North Atlantic Sea Surface Temperature Anomalies and Their Effect on Winter European Climate, 1948–2002." Journal of Climate 19, no. 7 (2006): 1067–79. http://dx.doi.org/10.1175/jcli3646.1.

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Abstract Eastward-propagating interdecadal time-scale sea surface temperature (SST) winter anomalies have been shown to exist at the North Atlantic subpolar/subtropical gyre boundary. Heat flux and surface air temperature signatures of these anomalies are investigated using satellite- and ship-based SST observations and atmospheric reanalysis. Using bandpass filter analysis, retaining periods between 9 and 25 yr, a succession of coherent propagating SST anomalies is identified. The size, speed, propagation path, and decay characteristics of propagating anomalies detected during the period 1948

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Lin, Ailan, and Tim Li. "Energy Spectrum Characteristics of Boreal Summer Intraseasonal Oscillations: Climatology and Variations during the ENSO Developing and Decaying Phases*." Journal of Climate 21, no. 23 (2008): 6304–20. http://dx.doi.org/10.1175/2008jcli2331.1.

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Abstract The geographic-dependence characteristics of the energy spectrum of the boreal summer intraseasonal oscillation (BSISO; May–October) over the Indo–western Pacific region were analyzed using 25-yr (1979–2003) observational data. The BSISO energy spectrum distribution exhibits a distinctive regional characteristic. The stationary and eastward-propagating modes are most pronounced at the equator (5°S–5°N), while the westward-propagating modes are dominant in the off-equatorial region (10°–20°N). While the eastward intraseasonal oscillation (ISO) spectrum agglomerates on the 30–60-day per

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Buller, A. S., Yu V. Zelenetskaya, R. V. Litvinov, and N. R. Melikhova. "Modulation instability of two TE modes in a thin left-handed film on a nonlinear right-handed substrate." Quantum Electronics 51, no. 11 (2021): 1030–37. http://dx.doi.org/10.1070/qel17647.

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Abstract The intramode wave beams in a thin left-handed film on a Kerr substrate are considered at a frequency near zero mode group velocity. Four coupled (1 + 1)-dimensional nonlinear Schrödinger equations, describing the interaction of forward and backward propagating beams with positive and negative group velocities, are derived. It is shown that self- and cross-phase modulation for four simultaneously propagating modes is possible only at strictly matched perturbations of their propagation constants, which is due to the contribution of spatial parametric mixing. The modulation instability

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Hammad, F. T., B. Stephen, L. Lubbad, J. F. B. Morrison, and W. J. Lammers. "Macroscopic electrical propagation in the guinea pig urinary bladder." American Journal of Physiology-Renal Physiology 307, no. 2 (2014): F172—F182. http://dx.doi.org/10.1152/ajprenal.00215.2014.

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There is little knowledge about macroscopic electrical propagation in the wall of the urinary bladder. Recording simultaneously from a large number of extracellular electrodes is one technology that could be used to study the patterns of macroscopic electrical propagations. The urinary bladders from 14 guinea pigs were isolated and placed in an organ bath. A 16 × 4-electrode array was positioned at various sites on the serosal bladder surface, and recordings were performed at different intravesical volumes. In four experiments, carbachol (CCH; 10−6 M), nifedipine (10 mM), or tetrodotoxin (TTX;

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Jin, Hong Bin. "Numerical Simulation of Wave Propagation in Variable Cross-Section Bars." Advanced Materials Research 378-379 (October 2011): 72–76. http://dx.doi.org/10.4028/www.scientific.net/amr.378-379.72.

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A model for wave propagation in variable cross-section bars is developed. Then a numerical simulation method based on CSPM is introduced. Furthermore the wave propagations in stepped bars and conical bars are simulated. The simulation results agree well with the analytical solutions, which demonstrate that the model can describe the wave propagation in variable cross-section bars precisely.

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Mitu, Maria, Venera Giurcan, Codina Movileanu, Domnina Razus, and Dumitru Oancea. "Propagation of CH4-N2O-N2 Flames in a Closed Spherical Vessel." Processes 9, no. 5 (2021): 851. http://dx.doi.org/10.3390/pr9050851.

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Flammable fuel-N2O mixtures raise safety and environmental protection issues in areas where these mixtures are used (such as: industry, research, internal combustion engines). Therefore, it is important to know their laminar combustion velocities and propagation speeds—important safety parameters for design of active protection devices against gas explosions and corresponding safety recommendations. In this paper, the laminar combustion velocities of N2-diluted CH4-N2O flames, obtained in experiments on outwardly propagating flames, at various initial pressures (within 0.5–2.0 bar) and room te

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Evans, Colin G., Timothy Kang, and Elizabeth C. Cropper. "Selective Spike Propagation in the Central Processes of an Invertebrate Neuron." Journal of Neurophysiology 100, no. 5 (2008): 2940–47. http://dx.doi.org/10.1152/jn.90807.2008.

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Within a neuron, spike propagation can occur in a complex manner, with spikes propagating into some processes but not others. We study this phenomenon in an experimentally advantageous mechanoafferent in Aplysia, neuron B21. B21 has two processes within the CNS. One is ipsilateral to the soma and is referred to as the lateral process. The second travels into the contralateral hemiganglion and is referred to as the contralateral process. Previously we characterized spike propagation to the lateral process, which is an output region that contacts follower motor neurons. Spikes fail to actively p

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Zhu, Chang Shun, Guo Lin Wang, Ping Ping Li, and Shang Wei Chen. "Crack-Propagating Direction of Tire Bead Rubber Determined by J_max Criterion." Applied Mechanics and Materials 43 (December 2010): 628–32. http://dx.doi.org/10.4028/www.scientific.net/amm.43.628.

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Three-dimensional crack propagating path of tire bead rubber was the premise to study the crack propagation direction of bead. For this reason, Jmax Criterion was put forward. Utilized J integral maximum (Jmax) to determine the crack propagation direction of rubber. Calculated J-integral values of different preset directions by Abaqus built-in algorithm, obtained J (θ) curve which showed the Jmax and direction angle (θ) by fitting simulation data. Using Abaqus to set up two different crack model of bead rubber and simulate the crack propagation path, the results was consistent with the real cr

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Barrio, R., M. Rodríguez, A. Abad, and S. Serrano. "Uncertainty propagation or box propagation." Mathematical and Computer Modelling 54, no. 11-12 (2011): 2602–15. http://dx.doi.org/10.1016/j.mcm.2011.06.036.

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Hao, Zhoucheng, Yanan Liu, and Gang Wang. "Research on Data News Propagation Path Based on the Big Data Algorithm." International Transactions on Electrical Energy Systems 2022 (October 12, 2022): 1–13. http://dx.doi.org/10.1155/2022/5600004.

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News propagation originates from a person/location, dwelling with an event that grabs significance. News data propagation relies on telecommunication and big data for precise content distribution and mitigation of false news. Considering these factors, the event-dependent data propagation technique (EDPT) was introduced to improve the data precision. These data refer to the news information originating and propagating from digital media. The data analysis considers the external factors for fake information and precise projection medium for preventing multiviewed false circulations. In this tec

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Ambrosio, Benjamin, and Jean-Pierre Françoise. "Propagation of bursting oscillations." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 367, no. 1908 (2009): 4863–75. http://dx.doi.org/10.1098/rsta.2009.0143.

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We investigate a system of partial differential equations of reaction–diffusion type which displays propagation of bursting oscillations. This system represents the time evolution of an assembly of cells constituted by a small nucleus of bursting cells near the origin immersed in the middle of excitable cells. We show that this system displays a global attractor in an appropriated functional space. Numerical simulations show the existence in this attractor of recurrent solutions which are waves propagating from the central source. The propagation seems possible if the excitability of the neigh

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Ajayamohan, R. S., Suryachandra A. Rao, and Toshio Yamagata. "Influence of Indian Ocean Dipole on Poleward Propagation of Boreal Summer Intraseasonal Oscillations." Journal of Climate 21, no. 21 (2008): 5437–54. http://dx.doi.org/10.1175/2008jcli1758.1.

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Abstract The influence of the Indian Ocean dipole (IOD) on the poleward propagation of boreal summer intraseasonal oscillations (BSISOs) is examined using observed datasets. This study finds that coherent (incoherent) poleward propagation of precipitation anomalies from 5°S to 25°N are observed during negative (positive) IOD years. Disorganized poleward propagation of BSISO in the south equatorial Indian Ocean is observed during positive IOD years. The rationale behind such an anomaly in the poleward propagation of BSISO in contrasting IOD years is identified based on the theory of northward-p

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Kubáček, Lubomír. "Nonlinear error propagation law." Applications of Mathematics 41, no. 5 (1996): 329–45. http://dx.doi.org/10.21136/am.1996.134330.

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Aine, Sandip, and Maxim Likhachev. "Truncated Incremental Search: Faster Replanning by Exploiting Suboptimality." Proceedings of the AAAI Conference on Artificial Intelligence 27, no. 1 (2013): 16–24. http://dx.doi.org/10.1609/aaai.v27i1.8673.

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Incremental heuristic searches try to reuse their previous search efforts whenever these are available. As a result, they can often solve a sequence of similar planning problems much faster than planning from scratch. State-of-the-art incremental heuristic searches such as LPA*, D* and D* Lite all work by propagating cost changes to all the states on the search tree whose g-values (the costs of computed paths from the start) are no longer optimal. While such a complete propagation of cost changes is required to ensure optimality, the propagations can be stopped much earlier if we are looking f

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Krishnamoorthi, A., and Pabitra Kumar Ghosh. "From Seed to Succulence: Mastering Dragon Fruit Propagation Techniques." Journal of Plant Biota 3, no. 1 (2024): 8–12. http://dx.doi.org/10.51470/jpb.2024.3.1.08.

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From Seed to Succulence: Mastering Dragon Fruit Propagation Techniques delves into the intricacies of propagating dragon fruit, a fascinating tropical fruit known for its exotic appearance and nutritional benefits. This article explores various propagation methods, including seed germination, stem cuttings, and grafting, shedding light on the challenges and rewards associated with each technique. By elucidating the principles of dragon fruit propagation and offering practical tips for success, this article equips growers with the knowledge and skills to cultivate thriving dragon fruit plants f

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Carioli, S. M., and V. N. Fedorenko. "Regular and Stochastic Dynamics of Relativistic Particles in Alfvén Waves." Symposium - International Astronomical Union 140 (1990): 155–56. http://dx.doi.org/10.1017/s007418090018982x.

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We study the exact phase space dynamics of relativistic test particles propagating in static one-dimensional Alfvén waves, modelling cosmic ray propagation in the interplanetary medium and in the interstellar medium. The result shows that the conventional approach should not be considered adequate to explain important features of particle propagation in Alfvén waves.

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Gao, Tingran, Shahab Asoodeh, Yi Huang, and James Evans. "Wasserstein Soft Label Propagation on Hypergraphs: Algorithm and Generalization Error Bounds." Proceedings of the AAAI Conference on Artificial Intelligence 33 (July 17, 2019): 3630–37. http://dx.doi.org/10.1609/aaai.v33i01.33013630.

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Inspired by recent interests of developing machine learning and data mining algorithms on hypergraphs, we investigate in this paper the semi-supervised learning algorithm of propagating ”soft labels” (e.g. probability distributions, class membership scores) over hypergraphs, by means of optimal transportation. Borrowing insights from Wasserstein propagation on graphs [Solomon et al. 2014], we re-formulate the label propagation procedure as a message-passing algorithm, which renders itself naturally to a generalization applicable to hypergraphs through Wasserstein barycenters. Furthermore, in a

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Zhu, Jun, Hanhao Zhu, Jun Tang, and Guangxue Zheng. "Researches on very low frequency acoustic signal propagation characteristics in different shallow elastic wedge bottoms." MATEC Web of Conferences 283 (2019): 02003. http://dx.doi.org/10.1051/matecconf/201928302003.

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Targeted at the issue of extremely low-frequency (<100Hz) acoustic propagation in complex shallow elastic bottom environments. The influence law of different complex elastic bottoms on the acoustic signal propagation at very low frequency by acoustic energy flux has been analyzed with the simulation, which is based on the finite element method. The elastic bottoms which have been studied are the shallow horizontal elastic bottom, and the up-sloping and the down-sloping elastic bottom. The results show that the acoustic signal propagating in the up-sloping and down-sloping elastic bottom env

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ELIAS, V., T. G. STEELE, and K. TANAKA. "MASSLESS SCALAR FIELD PROPAGATOR IN A QUANTIZED SPACETIME." International Journal of Modern Physics E 16, no. 01 (2007): 51–57. http://dx.doi.org/10.1142/s0218301307004886.

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We consider in detail the analytic behaviour of the non-interacting massless scalar field two-point function in H. S. Snyder's discretized non-commuting spacetime. The propagator we find is purely real on the Euclidean side of the complex p2 plane and goes like 1/p2 as p2→0 from either the Euclidean or Minkowski side. The real part of the propagator goes smoothly to zero as p2 increases to the discretization scale 1/a2and remains zero for p2>1/a2. This behaviour is consistent with the termination of single-particle propagation on the ultraviolet side of the discretization scale. The imagina

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