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Journal articles on the topic 'Multi-scale limit'

Author: Grafiati

Published: 1 April 2023

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1

Khoei, A. R., and M. Jahanshahi. "Multi-scale modeling of plastic deformations in nano-scale materials; Transition to plastic limit." International Journal for Numerical Methods in Engineering 109, no. 8 (2016): 1180–216. http://dx.doi.org/10.1002/nme.5327.

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MINH, C. HA, FR BOUSSU, A. IMAD, T. KANIT, and D. CRÉPIN. "MULTI-SCALE MODEL TO PREDICT THE BALLISTIC IMPACT BEHAVIOR OF MULTI-LAYER PLAIN-WOVEN FABRICS." International Journal of Computational Methods 11, no. 03 (2014): 1343011. http://dx.doi.org/10.1142/s0219876213430111.

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This paper presents a multi-scale model that can predict the ballistic impact behavior of multi-layer plain-woven fabrics using the finite element method (FEM). Multi-layer fabrics of 30.5 × 30.5 cm, woven by high performance yarns Kevlar® 29 3000 denier, are impacted by a 0.3 fragment simulating projectile (FSP). Using a multi-scale approach, behavior of multi-layer fabrics subjected to different impact velocities is numerically analyzed. Ballistic limit of the fabric can also be predicted. The multi-scale model shows an effective gain of computation time in comparison with current mesoscopic

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Jung, M., T. F. Illenseer, and W. J. Duschl. "Multi-scale simulations of black hole accretion in barred galaxies." Astronomy & Astrophysics 614 (June 2018): A105. http://dx.doi.org/10.1051/0004-6361/201731688.

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Due to the non-axisymmetric potential of the central bar, in addition to their characteristic arms and bar, barred spiral galaxies form a variety of structures within the thin gas disk, such as nuclear rings, inner spirals, and dust lanes. These structures in the inner kiloparsec are extremely important in order to explain and understand the rate of black hole feeding. The aim of this work is to investigate the influence of stellar bars in spiral galaxies on the thin self-gravitating gas disk. We focus on the accretion of gas onto the central supermassive black hole and its time-dependent evol

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Kyoya, Takashi, Kenjiro Terada, and Toshikazu Kawamoto. "Multi-scale limit load analysis for discontinuous rock mass based on the homogenization method." International Journal for Numerical and Analytical Methods in Geomechanics 23, no. 10 (1999): 995–1019. http://dx.doi.org/10.1002/(sici)1096-9853(19990825)23:10<995::aid-nag21>3.0.co;2-b.

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Cotter, C. J., G. A. Gottwald, and D. D. Holm. "Stochastic partial differential fluid equations as a diffusive limit of deterministic Lagrangian multi-time dynamics." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 473, no. 2205 (2017): 20170388. http://dx.doi.org/10.1098/rspa.2017.0388.

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In Holm (Holm 2015 Proc. R. Soc. A 471 , 20140963. ( doi:10.1098/rspa.2014.0963 )), stochastic fluid equations were derived by employing a variational principle with an assumed stochastic Lagrangian particle dynamics. Here we show that the same stochastic Lagrangian dynamics naturally arises in a multi-scale decomposition of the deterministic Lagrangian flow map into a slow large-scale mean and a rapidly fluctuating small-scale map. We employ homogenization theory to derive effective slow stochastic particle dynamics for the resolved mean part, thereby obtaining stochastic fluid partial equati

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Sun, Xiangkun, Changwei Zhou, Mohamed Ichchou, Jean-Pierre Lainé, and Abdel-Malek Zine. "Multi-Scale Homogenization of Transversal Waves in Periodic Composite Beams." International Journal of Applied Mechanics 09, no. 03 (2017): 1750039. http://dx.doi.org/10.1142/s1758825117500399.

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This paper deals with the deduction of new homogenized models for the flexural wave in bi-periodic beams. According to the homogenization theory, the long-wave assumption is used and the valid frequency range of homogenized models is limited to the first Bragg band gap. However, the classical homogenization method, whose idea is taking the component’s mean values as effective material properties, has limitations in mimicking the dispersive behavior and the real valid frequency range is far less than the limit. Thus, enriched homogenized models, derived by the multi-scale asymptotic homogenizat

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Vulliez, Margot, Matthew A. Gleason, Aurélien Souto-Lebel, et al. "Multi-scale Curvature Analysis and Correlations with the Fatigue Limit on Steel Surfaces after Milling." Procedia CIRP 13 (2014): 308–13. http://dx.doi.org/10.1016/j.procir.2014.04.052.

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Xiao, Liang, Yan Li, Huangqing Xiao, Zheren Zhang, and Zheng Xu. "Electromechanical Transient Modeling of Line Commutated Converter-Modular Multilevel Converter-Based Hybrid Multi-Terminal High Voltage Direct Current Transmission Systems." Energies 11, no. 8 (2018): 2102. http://dx.doi.org/10.3390/en11082102.

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A method for electromechanical modeling of line commutated converter (LCC)-modular multilevel converter (MMC)-based hybrid multi-terminal High Voltage Direct Current Transmission (HVDC) systems for large-scale power system transient stability study is proposed. Firstly, the general idea of modeling the LCC-MMC hybrid multi-terminal HVDC system is presented, then the AC-side and DC-side models of the LCC/MMC are established. Different from the conventional first-order DC-side model of the MMC, an improved second-order DC-side model of the MMC is established. Besides considering the firing angle

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Yang, Mao, Yu Cui, Dawei Huang, Xin Su, and Gang Wu. "Multi-time-scale coordinated optimal scheduling of integrated energy system considering frequency out-of-limit interval." International Journal of Electrical Power & Energy Systems 141 (October 2022): 108268. http://dx.doi.org/10.1016/j.ijepes.2022.108268.

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Hart, W. S., P. K. Maini, C. A. Yates, and R. N. Thompson. "A theoretical framework for transitioning from patient-level to population-scale epidemiological dynamics: influenza A as a case study." Journal of The Royal Society Interface 17, no. 166 (2020): 20200230. http://dx.doi.org/10.1098/rsif.2020.0230.

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Multi-scale epidemic forecasting models have been used to inform population-scale predictions with within-host models and/or infection data collected in longitudinal cohort studies. However, most multi-scale models are complex and require significant modelling expertise to run. We formulate an alternative multi-scale modelling framework using a compartmental model with multiple infected stages. In the large-compartment limit, our easy-to-use framework generates identical results compared to previous more complicated approaches. We apply our framework to the case study of influenza A in humans.

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de Oliveira Gomes, André, and Pedro Catuogno. "Moderate Averaged Deviations for a Multi-Scale System with Jumps and Memory." Dynamics 3, no. 1 (2023): 171–201. http://dx.doi.org/10.3390/dynamics3010011.

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This work studies a two-time-scale functional system given by two jump diffusions under the scale separation by a small parameter ε→0. The coefficients of the equations that govern the dynamics of the system depend on the segment process of the slow variable (responsible for capturing delay effects on the slow component) and on the state of the fast variable. We derive a moderate deviation principle for the slow component of the system in the small noise limit using the weak convergence approach. The rate function is written in terms of the averaged dynamics associated with the multi-scale sys

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Engquist, B., and P. E. Souganidis. "Asymptotic and numerical homogenization." Acta Numerica 17 (April 25, 2008): 147–90. http://dx.doi.org/10.1017/s0962492906360011.

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Homogenization is an important mathematical framework for developing effective models of differential equations with oscillations. We include in the presentation techniques for deriving effective equations, a brief discussion on analysis of related limit processes and numerical methods that are based on homogenization principles. We concentrate on first- and second-order partial differential equations and present results concerning both periodic and random media for linear as well as nonlinear problems. In the numerical sections, we comment on computations of multi-scale problems in general an

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Pu, Can, Runzi Song, Radim Tylecek, Nanbo Li, and Robert Fisher. "SDF-MAN: Semi-Supervised Disparity Fusion with Multi-Scale Adversarial Networks." Remote Sensing 11, no. 5 (2019): 487. http://dx.doi.org/10.3390/rs11050487.

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Refining raw disparity maps from different algorithms to exploit their complementary advantages is still challenging. Uncertainty estimation and complex disparity relationships among pixels limit the accuracy and robustness of existing methods and there is no standard method for fusion of different kinds of depth data. In this paper, we introduce a new method to fuse disparity maps from different sources, while incorporating supplementary information (intensity, gradient, etc.) into a refiner network to better refine raw disparity inputs. A discriminator network classifies disparities at diffe

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Liu, Guangmao, Jiangtao Chen, Runrun Li, Jialin Jin, and Yuying Cheng. "Multi-agent technology based voltage grading control method for distribution network." ITM Web of Conferences 47 (2022): 03012. http://dx.doi.org/10.1051/itmconf/20224703012.

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It is one of the challenges to solve the power quality problems such as voltage fluctuation and voltage exceeding limit caused by the largescale grid connection of distributed photovoltaic (DPV). Considering the operation speed of voltage regulation control in distribution network, this paper proposes a voltage hierarchical control method based on multi-agent structure. The mathematical models of this method are divided into dualtime scale global optimization model and event-triggered voltage regional autonomy model, aiming at solving the problem of operation safety of voltage exceeding limit.

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Qin, Fang, Lele Zhang, Geng Chen, and Christoph Broeckmann. "Lower bound limit and shakedown analysis of orthotropic material." Mathematics and Mechanics of Solids 25, no. 11 (2020): 2037–49. http://dx.doi.org/10.1177/1081286520918004.

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We present in this study a new approach for predicting the plastic and shakedown limits of structures composed of orthotropic materials. In this approach, the Hill yield criterion is introduced to Melan’s theorem. By formulating the problem by means of the finite element method and solving the resulting large-scale nonlinear optimization problem we successfully predict the plastic and shakedown limits of structures having complex geometries made from multi-orthotropic materials. Several numerical examples are elaborated in this study for evaluating the accuracy, general applicability, as well

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16

Adeleke, T. B., R. O. Edokpia, M. K. Onifade, and N. B. Chime. "Development of a Multi-criteria Decision Model for Nigerian Refinery Bottlenecks." European Journal of Engineering and Technology Research 6, no. 5 (2021): 80–83. http://dx.doi.org/10.24018/ejers.2021.6.5.2492.

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Production systems are continually surrounded by bottleneck problems that limit their overall performances. The petroleum industry today faces a lot of challenges which border on production bottlenecks that tend to limit production throughput and hence output. The purpose of this study is to provide a decision support strategy for refinery operators and mangers as well as other stakeholders. The multi-criteria models used were the Analytical Hierarchy Process (AHP) and the Test of Preference by Similarity to Ideal Solution (TOPSIS). A 9-point saaty scale and 10-point linguistic scale questionn

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Adeleke, T. B., R. O. Edokpia, M. K. Onifade, and N. B. Chime. "Development of a Multi-criteria Decision Model for Nigerian Refinery Bottlenecks." European Journal of Engineering and Technology Research 6, no. 5 (2021): 80–83. http://dx.doi.org/10.24018/ejeng.2021.6.5.2492.

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Production systems are continually surrounded by bottleneck problems that limit their overall performances. The petroleum industry today faces a lot of challenges which border on production bottlenecks that tend to limit production throughput and hence output. The purpose of this study is to provide a decision support strategy for refinery operators and mangers as well as other stakeholders. The multi-criteria models used were the Analytical Hierarchy Process (AHP) and the Test of Preference by Similarity to Ideal Solution (TOPSIS). A 9-point saaty scale and 10-point linguistic scale questionn

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18

Ekanga, Trésor. "Localization in the multi-particle tight-binding Anderson model at low energy." Reviews in Mathematical Physics 32, no. 03 (2019): 2050009. http://dx.doi.org/10.1142/s0129055x20500099.

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We consider the multi-particle tight-binding Anderson model and prove that its lower spectral edge is non-random under some mild assumptions on the inter-particle interaction and the random external potential. We also adapt to the low energy regime the multi-particle multi-scale analysis initially developed by Chulaevsky and Suhov in the high disorder limit, if the marginal probability distribution of the i.i.d. random variables is log-Hölder continuous and we obtain the spectral exponential and strong dynamical localization near the bottom of the spectrum.

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Liao, Yuchen. "Multi-point distribution of discrete time periodic TASEP." Probability Theory and Related Fields 182, no. 3-4 (2022): 1053–131. http://dx.doi.org/10.1007/s00440-021-01107-8.

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AbstractWe study the one-dimensional discrete time totally asymmetric simple exclusion process with parallel update rules on a spatially periodic domain. A multi-point space-time joint distribution formula is obtained for general initial conditions. The formula involves contour integrals of Fredholm determinants with kernels acting on certain discrete spaces. For a class of initial conditions satisfying certain technical assumptions, we are able to derive large-time, large-period limit of the joint distribution, under the relaxation time scale $$t=O(L^{3/2})$$ t = O ( L 3 / 2 ) when the height

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Yano, J. I. "Mass-flux subgrid-scale parameterization in analogy with multi-component flows: a formulation towards scale independence." Geoscientific Model Development 5, no. 6 (2012): 1425–40. http://dx.doi.org/10.5194/gmd-5-1425-2012.

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Abstract. A generalized mass-flux formulation is presented, which no longer takes a limit of vanishing fractional areas for subgrid-scale components. The presented formulation is applicable to a~situation in which the scale separation is still satisfied, but fractional areas occupied by individual subgrid-scale components are no longer small. A self-consistent formulation is presented by generalizing the mass-flux formulation under the segmentally-constant approximation (SCA) to the grid–scale variabilities. The present formulation is expected to alleviate problems arising from increasing reso

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Luo, Zhao, Zhendong Zhu, Zhiyuan Zhang, et al. "Multi-Time-Scale Rolling Optimal Dispatch for Grid-Connected AC/DC Hybrid Microgrids." Processes 7, no. 12 (2019): 961. http://dx.doi.org/10.3390/pr7120961.

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In order to reduce the impact of the randomness and volatility of renewable energy on the economic operation of AC/DC hybrid microgrids, a multi-time-scale rolling optimization strategy is proposed for the grid-connected AC/DC hybrid microgrids. It considers the source-load uncertainty declined with time scale reduction, and the scheduling cooperation problem of different units on different time scales. In this paper, we propose a three-time-scale optimal strategy of the day-ahead, intraday and real-time dispatching stage and a two-level rolling optimal strategy of the intraday and real-time s

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Wang, Ling, Hongqiao Wang, and Guangyuan Fu. "Multi-Nyström Method Based on Multiple Kernel Learning for Large Scale Imbalanced Classification." Computational Intelligence and Neuroscience 2021 (June 13, 2021): 1–11. http://dx.doi.org/10.1155/2021/9911871.

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Extensions of kernel methods for the class imbalance problems have been extensively studied. Although they work well in coping with nonlinear problems, the high computation and memory costs severely limit their application to real-world imbalanced tasks. The Nyström method is an effective technique to scale kernel methods. However, the standard Nyström method needs to sample a sufficiently large number of landmark points to ensure an accurate approximation, which seriously affects its efficiency. In this study, we propose a multi-Nyström method based on mixtures of Nyström approximations to av

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23

Dai, Shibin, and Keith Promislow. "Geometric evolution of bilayers under the functionalized Cahn–Hilliard equation." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 469, no. 2153 (2013): 20120505. http://dx.doi.org/10.1098/rspa.2012.0505.

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We use a multi-scale analysis to derive a sharp interface limit for the dynamics of bilayer structures of the functionalized Cahn–Hilliard equation. In contrast to analysis based on single-layer interfaces, we show that the Stefan and Mullins–Sekerka problems derived for the evolution of single-layer interfaces for the Cahn–Hilliard equation are trivial in this context, and the sharp interface limit yields a quenched mean-curvature-driven normal velocity at O ( ε −1 ), whereas on the longer O ( ε −2 ) time scale, it leads to a total surface area preserving Willmore flow. In particular, for spa

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Pereira, Carlos Alvarez, and José M. Vega. "On the pulsating instability of two-dimensional flames." European Journal of Applied Mathematics 3, no. 1 (1992): 55–73. http://dx.doi.org/10.1017/s0956792500000681.

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We consider a well-known thermo-diffusive model for the propagation of a premixed, adiabatic flame front in the large-activation-energy limit. That model depends only on one nondimensional parameter β, the reduced Lewis number. Near the pulsating instability limit, as β↓β0= 32/3, we obtain an asymptotic model for the evolution of a quasi-planar flame front, via a multi-scale analysis. The asymptotic model consists of two complex Ginzburg–Landau equations and a real Burgers equation, coupled by non-local terms. The model is used to analyse the nonlinear stability of the flame front.

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Glazman, Roman E. "A simple theory of capillary–gravity wave turbulence." Journal of Fluid Mechanics 293 (June 25, 1995): 25–34. http://dx.doi.org/10.1017/s0022112095001613.

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Employing a recently proposed ‘multi-wave interaction’ theory (Glazman 1992), inertial spectra of capillary-gravity waves are derived. This case is characterized by a rather high degree of nonlinearity and a complicated dispersion law. The absence of scale invariance makes this and some other problems of wave turbulence (e.g. nonlinear inertia-gravity waves) intractable by small-perturbation techniques, even in the weak-turbulence limit. The analytical solution obtained in the present work for an arbitrary degree of nonlinearity is shown to be in reasonable agreement with experimental data. Th

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Jeon, Suyeon, and Yong Seok Heo. "Efficient Multi-Scale Stereo-Matching Network Using Adaptive Cost Volume Filtering." Sensors 22, no. 15 (2022): 5500. http://dx.doi.org/10.3390/s22155500.

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While recent deep learning-based stereo-matching networks have shown outstanding advances, there are still some unsolved challenges. First, most state-of-the-art stereo models employ 3D convolutions for 4D cost volume aggregation, which limit the deployment of networks for resource-limited mobile environments owing to heavy consumption of computation and memory. Although there are some efficient networks, most of them still require a heavy computational cost to incorporate them to mobile computing devices in real-time. Second, most stereo networks indirectly supervise cost volumes through disp

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Xiong, Wei, Jianfeng Wang, and Zhuang Cheng. "A Novel Multi-Scale Particle Morphology Descriptor with the Application of SPHERICAL Harmonics." Materials 13, no. 15 (2020): 3286. http://dx.doi.org/10.3390/ma13153286.

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Particle morphology is of great significance to the grain- and macro-scale behaviors of granular soils. Most existing traditional morphology descriptors have three perennial limitations, i.e., dissensus of definition, inter-scale effect, and surface roughness heterogeneity, which limit the accurate representation of particle morphology. The inter-scale effect refers to the inaccurate representation of the morphological features at the target relative length scale (RLS, i.e., length scale with respective to particle size) caused by the inclusion of additional morphological details existing at o

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Liu, Changyuan, Yunfu Yin, Yuhan Sun, and Okan K. Ersoy. "Multi-scale ResNet and BiGRU automatic sleep staging based on attention mechanism." PLOS ONE 17, no. 6 (2022): e0269500. http://dx.doi.org/10.1371/journal.pone.0269500.

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Sleep staging is the basis of sleep evaluation and a key step in the diagnosis of sleep-related diseases. Despite being useful, the existing sleep staging methods have several disadvantages, such as relying on artificial feature extraction, failing to recognize temporal sequence patterns in the long-term associated data, and reaching the accuracy upper limit of sleep staging. Hence, this paper proposes an automatic Electroencephalogram (EEG) sleep signal staging model, which based on Multi-scale Attention Residual Nets (MAResnet) and Bidirectional Gated Recurrent Unit (BiGRU). The proposed mod

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Shi, Jian, and Mingbo Tong. "Multi-Scale Nonlinear Progressive Damage and Failure Analysis for Open-Hole Composite Laminates." Aerospace 9, no. 2 (2022): 59. http://dx.doi.org/10.3390/aerospace9020059.

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In order to study the nonlinear behaviors and interactions among the constituents for the composite material structure under the tensile load, multiscale damage model using generalized method of cells (GMC) and a lamina-level progressive damage model were established, respectively, for fiber reinforced composite laminates with a central hole, which were based on the thermodynamic Schapery Theory (ST) at either the micro-level or the lamina level. Once the nonlinear progressive degradation of the matrix material reached the lower limit value for the ST method, matrix failures naturally occurred

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Luo, Tao, and Yan-Lin Wang. "Multi-scale nonlinear singular limit for thermal non-equilibrium gas flow with multiple non-equilibrium modes for analytic data in multi-dimensions with physical boundaries." Journal of Mathematical Physics 61, no. 10 (2020): 101512. http://dx.doi.org/10.1063/5.0025752.

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CHALONS, C., and F. COQUEL. "THE RIEMANN PROBLEM FOR THE MULTI-PRESSURE EULER SYSTEM." Journal of Hyperbolic Differential Equations 02, no. 03 (2005): 745–82. http://dx.doi.org/10.1142/s0219891605000610.

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We prove the existence and uniqueness of the Riemann solutions to the Euler equations closed by N independent constitutive pressure laws. This model stands as a natural asymptotic system for the multi-pressure Navier–Stokes equations in the regime of infinite Reynolds number. Due to the inherent lack of conservation form in the viscous regularization, the limit system exhibits measure-valued source terms concentrated on shock discontinuities. These non-positive bounded measures, called kinetic relations, are known to provide a suitable tool to encode the small-scale sensitivity in the singular

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Guillaumet, Alban, and Guillaume Leotard. "Annoying neighbors: Multi-scale distribution determinants of two sympatric sibling species of birds." Current Zoology 61, no. 1 (2015): 10–22. http://dx.doi.org/10.1093/czoolo/61.1.10.

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Abstract We tested the role of interspecific competition in driving species distribution at multiple spatial scales using two sibling species of Galerida larks (G. cristata and G. theklae) in Morocco (sympatry), Balearic islands (G. theklae only) and Israel (G. cristata only). We first investigated regional-scale determinants by contrasting allopatric versus sympatric patterns in five distinct habitat types. We next focused on a single habitat used by both species, the coastal sand dunes. Dune quadrats were established along the Moroccan coast and completed by a quadrat in the nearest distinct

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Siorikis, Dimitris K., Christos V. Nastos, Dimitris A. Saravanos, and Esteban Martino Gonzalez. "A Strain-rate Dependant Micromechanical Finite Element Model for High-velocity Impacts on Laminated Composite Plates." MATEC Web of Conferences 304 (2019): 01009. http://dx.doi.org/10.1051/matecconf/201930401009.

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A novel multi-scale numerical model for the simulation of high-velocity impacts on laminated composite plates is developed, which encompasses a micromechanics module for the accurate assessment of damage initiation and growth in the individual composite micromechanical constituents and for the efficient inclusion of strain rate effects into the analysis. A series of woven carbon/epoxy plate specimens impacted by steel ball impactors of high velocities and energies reaching and exceeding the ballistic limit (m=110 g, v=60-100 m/s, E=200-500 J) are also investigated. Ultimately, key impact simul

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Dimarco, Giacomo, Lorenzo Pareschi, and Vittorio Rispoli. "Implicit-Explicit Runge-Kutta Schemes for the Boltzmann-Poisson System for Semiconductors." Communications in Computational Physics 15, no. 5 (2014): 1291–319. http://dx.doi.org/10.4208/cicp.090513.151113a.

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AbstractIn this paper we develop a class of Implicit-Explicit Runge-Kutta schemes for solving the multi-scale semiconductor Boltzmann equation. The relevant scale which characterizes this kind of problems is the diffusive scaling. This means that, in the limit of zero mean free path, the system is governed by a drift-diffusion equation. Our aim is to develop a method which accurately works for the different regimes encountered in general semiconductor simulations: the kinetic, the intermediate and the diffusive one. Moreover, we want to overcome the restrictive time step conditions of standard

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Zhang, Rosa, Anamika Chowdhury, Justin C. Bui, Clayton J. Radke, and Adam Z. Weber. "Multi-Scale Modeling of Hydrogen Transport in a Porous Fuel Cell Anode." ECS Meeting Abstracts MA2022-01, no. 55 (2022): 2313. http://dx.doi.org/10.1149/ma2022-01552313mtgabs.

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Proton-exchange-membrane fuel cells (PEMFC) are a clean energy conversion alternative to traditional fossil-fuel combustion; however, transport resistances in the electrode pose a lower-limit to catalyst loading and commercialization of PEMFCs. PEMFCs consist of simultaneous hydrogen (H2) oxidation and oxygen (O2) reduction at the anode and cathode, respectively. While oxygen transport resistances in PEMFCs have been widely studied both experimentally and analytically, hydrogen transport resistances are less understood. Herein, we present a physics-based model that encompasses multi-scale tran

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Yang, Junfang, Yi Ma, Yabin Hu, et al. "Decision Fusion of Deep Learning and Shallow Learning for Marine Oil Spill Detection." Remote Sensing 14, no. 3 (2022): 666. http://dx.doi.org/10.3390/rs14030666.

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Marine oil spills are an emergency of great harm and have become a hot topic in marine environmental monitoring research. Optical remote sensing is an important means to monitor marine oil spills. Clouds, weather, and light control the amount of available data, which often limit feature characterization using a single classifier and therefore difficult to accurate monitoring of marine oil spills. In this paper, we develop a decision fusion algorithm to integrate deep learning methods and shallow learning methods based on multi-scale features for improving oil spill detection accuracy in the ca

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Tang, Chao, Xiaofan Chen, Zhimin Du, Ping Yue, and Jiabao Wei. "Numerical Simulation Study on Seepage Theory of a Multi-Section Fractured Horizontal Well in Shale Gas Reservoirs Based on Multi-Scale Flow Mechanisms." Energies 11, no. 9 (2018): 2329. http://dx.doi.org/10.3390/en11092329.

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Aimed at the multi-scale fractures for stimulated reservoir volume (SRV)-fractured horizontal wells in shale gas reservoirs, a mathematical model of unsteady seepage is established, which considers the characteristics of a dual media of matrix and natural fractures as well as flow in the large-scale hydraulic fractures, based on a discrete-fracture model. Multi-scale flow mechanisms, such as gas desorption, the Klinkenberg effect, and gas diffusion are taken into consideration. A three-dimensional numerical model based on the finite volume method is established, which includes the construction

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Jiang, Wei, Xianglian Meng, and Ji Xi. "Multilevel Attention and Multiscale Feature Fusion Network for Author Classification of Chinese Ink-Wash Paintings." Discrete Dynamics in Nature and Society 2022 (March 10, 2022): 1–10. http://dx.doi.org/10.1155/2022/9188356.

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How to effectively extract features with high representation ability has always been a research topic and a challenge for classification tasks. Most of the existing methods mainly solve the problem by using deep convolutional neural networks as feature extractors. Although a series of excellent network structures have been successful in the field of Chinese ink-wash painting classification, but most of them adopted the methods of only simple augmentation of the network structures and direct fusion of different scale features, which limit the network to further extract semantically rich and sca

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Ximenes, Arimatéa, Leandro Ponsoni, Catarina Lira, Nico Koedam, and Farid Dahdouh-Guebas. "Does Sea Surface Temperature Contribute to Determining Range Limits and Expansion of Mangroves in Eastern South America (Brazil)?" Remote Sensing 10, no. 11 (2018): 1787. http://dx.doi.org/10.3390/rs10111787.

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Low Sea Surface Temperature (SST) is a climate barrier because it may inhibit and reduce seedling growth of mangrove propagules upon dispersal through seawater. Our objective is to analyze the spatio-temporal series of daily SST data from the Multi-scale Ultra-high Resolution (MUR)-SST in order to identify the occurrence of chilling events for mangrove plants at the Eastern South America mangrove limit and beyond. We focus our study on three key sites: (i) the Rhizophora mangle L. distribution limit (Praia do Sonho: 27°53′S), (ii) the Eastern South America mangrove limit (Laguna: 28°30′S) and

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Cai, Zhi, Tao Wang, Qing Mi, Xing Su, Limin Guo, and Zhiming Ding. "Dynamic Weighted Road Network Based Multi-Vehicles Navigation and Evacuation." ISPRS International Journal of Geo-Information 12, no. 3 (2023): 127. http://dx.doi.org/10.3390/ijgi12030127.

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Many events such as large-scale activities and traffic accidents could cause an increase in vehicle density in an area, which makes the evacuation of vehicles important. However, the existing evacuation methods are not efficient limit to multi-vehicles sequences or destinations. In this paper, we introduce a novel dynamic weighted road network model for route planning. Based on the model, the route planning algorithm can obtain higher search efficiency while avoiding congested roads. For multi-vehicles evacuation, we propose a spatial diversity theory to evaluate the overlaps of routes between

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Neronov, A., D. Semikoz та Ie Vovk. "New limit on high Galactic latitude PeV γ-ray flux from Tibet ASγ data". Astronomy & Astrophysics 653 (вересень 2021): L4. http://dx.doi.org/10.1051/0004-6361/202141800.

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The Tibet ASγ collaboration has recently reported the detection of γ-rays with energies up to Peta-electronvolt from parts of the Galactic plane. We note that the analysis of γ-ray flux by the Tibet-ASγ experiment also implies an upper bound on the diffuse γ-ray flux from high Galactic latitudes (|b|> 20°) in the energy range between 100 TeV and 1 PeV. This bound is up to an order of magnitude stronger than previously derived bounds from GRAPES3, KASCADE, and CASA-MIA experiments. We discuss the new Tibet-ASγ limit on the high Galactic latitude γ-ray flux in the context of possible mechanis

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Dieker, A. B., and T. Suk. "Randomized longest-queue-first scheduling for large-scale buffered systems." Advances in Applied Probability 47, no. 4 (2015): 1015–38. http://dx.doi.org/10.1239/aap/1449859798.

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We develop diffusion approximations for parallel-queueing systems with the randomized longest-queue-first scheduling (LQF) algorithm by establishing new mean-field limit theorems as the number of buffers n → ∞. We achieve this by allowing the number of sampled buffers d = d(n) to depend on the number of buffers n, which yields an asymptotic 'decoupling' of the queue length processes. We show through simulation experiments that the resulting approximation is accurate even for moderate values of n and d(n). To the best of the authors' knowledge, this is the first derivation of diffusion approxim

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Dieker, A. B., and T. Suk. "Randomized longest-queue-first scheduling for large-scale buffered systems." Advances in Applied Probability 47, no. 04 (2015): 1015–38. http://dx.doi.org/10.1017/s0001867800048990.

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We develop diffusion approximations for parallel-queueing systems with the randomized longest-queue-first scheduling (LQF) algorithm by establishing new mean-field limit theorems as the number of buffers n → ∞. We achieve this by allowing the number of sampled buffers d = d(n) to depend on the number of buffers n, which yields an asymptotic 'decoupling' of the queue length processes. We show through simulation experiments that the resulting approximation is accurate even for moderate values of n and d(n). To the best of the authors' knowledge, this is the first derivation of diffusion approxim

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HE, DONGXIAO, JIE LIU, BO YANG, YUXIAO HUANG, DAYOU LIU, and DI JIN. "AN ANT-BASED ALGORITHM WITH LOCAL OPTIMIZATION FOR COMMUNITY DETECTION IN LARGE-SCALE NETWORKS." Advances in Complex Systems 15, no. 08 (2012): 1250036. http://dx.doi.org/10.1142/s0219525912500361.

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In this paper, we propose a multi-layer ant-based algorithm (MABA), which detects communities from networks by means of locally optimizing modularity using individual ants. The basic version of MABA, namely SABA, combines a self-avoiding label propagation technique with a simulated annealing strategy for ant diffusion in networks. Once the communities are found by SABA, this method can be reapplied to a higher level network where each obtained community is regarded as a new vertex. The aforementioned process is repeated iteratively, and this corresponds to MABA. Thanks to the intrinsic multi-l

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Yang, Chao-Tung, Wen-Jen Hu, and Kuan-Chou Lai. "On Construction of a Multi-Grid Resource Selection Strategy on Grids." International Journal of Grid and High Performance Computing 6, no. 1 (2014): 38–62. http://dx.doi.org/10.4018/ijghpc.2014010103.

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Grid computing is now in widespread use, integrating geographical computing resources across multiple virtual organizations to achieve high performance computing. A single grid does not often provide a vast resource because virtual organizations have inadequate computing resource restrictions for management on an organizational scale. This paper presents a new grid architecture named Multi-Grid, which integrates multiple computational grids from different virtual organizations. This study builds a resource broker on multiple grid environments, integrating a number of single grids from differen

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Liu, Chunyue, Hongxing Jiang, Shuqing Zhang, Chunrong Li, Yunqiu Hou, and Fawen Qian. "Multi-scale analysis to uncover habitat use of red-crowned cranes: Implications for conservation." Current Zoology 59, no. 5 (2013): 604–17. http://dx.doi.org/10.1093/czoolo/59.5.604.

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Abstract A multi-scale approach is essential to assess the factors that limit avian habitat use. Numerous studies have examined habitat use by the red-crowned crane, but integrated multi-scale habitat use information is lacking. We evaluated the effects of several habitat variables quantified across many spatial scales on crane use and abundance in two periods (2000 and 2009) at Yancheng National Nature Reserve, China. The natural wetlands decreased in area by 30,601 ha (-6.9%) from 2000 to 2009, predominantly as a result of conversion to aquaculture ponds and farmland, and the remaining was u

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Yang, F., D. La Civita, M. Vannoni, and H. Sinn. "Damage simulation due to heat load from X-ray FEL beam at European XFEL." Journal of Physics: Conference Series 2380, no. 1 (2022): 012067. http://dx.doi.org/10.1088/1742-6596/2380/1/012067.

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Abstract In the X-ray FEL beam transport system, the optic components which have direct contact with the beam, e.g. mirror, absorber and beam shutter, etc., could exceed 10 kW peak heat load on a sub-mm spot. Therefore, the thermo-mechanical performance of these components under the extreme high heat load will limit the maximum allowed pulses for the safety operation of the facility. In this contribution, a selection of multi-scale and multi-physics numerical models using finite element tools is introduced to describe the interaction of X-ray laser beam with different materials, taking into co

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Butler, CL, VL Lucieer, SJ Wotherspoon, and CR Johnson. "Multi-decadal decline in cover of giant kelp Macrocystis pyrifera at the southern limit of its Australian range." Marine Ecology Progress Series 653 (October 29, 2020): 1–18. http://dx.doi.org/10.3354/meps13510.

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Knowledge of long-term and multi-scale trends in ecological systems is a vital component in understanding their dynamics. We used Landsat satellite imagery to develop the first long-term (1986-2015) data set describing the cover of dense surface canopies of giant kelp Macrocystis pyrifera around the entire coastline of Tasmania, Australia, and assessed the extent to which potential environmental drivers explain the dynamics of surface canopies at multiple spatial and temporal scales. Broad-scale temporal patterns in canopy cover are correlated with El Niño-Southern Oscillation events, while re

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Blank, Lior, and Leon Blaustein. "A multi-scale analysis of breeding site characteristics of the endangered fire salamander (Salamandra infraimmaculata) at its extreme southern range limit." Hydrobiologia 726, no. 1 (2013): 229–44. http://dx.doi.org/10.1007/s10750-013-1770-8.

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Angioni, R., E. Ros, M. Kadler, et al. "Gamma-ray emission in radio galaxies under the VLBI scope." Astronomy & Astrophysics 627 (July 2019): A148. http://dx.doi.org/10.1051/0004-6361/201935697.

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Aims. In the framework of the multi-wavelength and very long baseline interferometry (VLBI) monitoring program TANAMI (Tracking Active Nuclei with Austral Milliarcsecond Interferometry), we study the evolution of the parsec-scale radio emission in radio galaxies in the southern hemisphere and their relationship to the γ-ray properties of the sources. Our study investigates systematically, for the first time, the relationship between the two energy regimes in radio galaxies. In this first paper, we focus on Fermi-LAT-detected sources. Methods. The TANAMI program monitors a large sample of radio

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