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Journal articles on the topic 'Fast mesoscopic model'

Author: Grafiati

Published: 13 April 2024

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1

Sakout, Sofia, Daniel Weisz-Patrault, and Alain Ehrlacher. "Energetic upscaling strategy for grain growth. i: Fast mesoscopic model based on dissipation." Acta Materialia 196 (September 2020): 261–79. http://dx.doi.org/10.1016/j.actamat.2020.06.032.

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Zhou, Xuesong, Jeffrey Taylor, and Filippo Pratico. "DTALite: A queue-based mesoscopic traffic simulator for fast model evaluation and calibration." Cogent Engineering 1, no. 1 (2014): 961345. http://dx.doi.org/10.1080/23311916.2014.961345.

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3

Wang, Enjiang, José M. Carcione, and Jing Ba. "Wave simulation in double-porosity media based on the Biot-Rayleigh theory." GEOPHYSICS 84, no. 4 (2019): WA11—WA21. http://dx.doi.org/10.1190/geo2018-0575.1.

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We have developed a numerical algorithm for simulation of wave propagation in double-porosity media, where the pore space is saturated with a single fluid. Spherical inclusions embedded in a background medium oscillate to yield attenuation by mode conversion from fast P-wave energy to slow P-wave energy (mesoscopic or wave-induced fluid-flow loss). The theory is based on the Biot theory of poroelasticity and the Rayleigh model of bubble oscillations. The differential equation of the Biot-Rayleigh variable is approximated with the Zener mechanical model, which results in a memory-variable visco

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Needell, Zachary A., and Jessika E. Trancik. "Efficiently Simulating Personal Vehicle Energy Consumption in Mesoscopic Transport Models." Transportation Research Record: Journal of the Transportation Research Board 2672, no. 25 (2018): 163–73. http://dx.doi.org/10.1177/0361198118798244.

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Mesoscopic transport models can efficiently simulate complex travel behavior and traffic patterns over large networks, but simulating energy consumption in these models is difficult with traditional methods. As mesoscopic transport models rely on a simplified handling of traffic flow, they cannot provide the second-by-second measurement of vehicle speeds and accelerations that are required for accurately estimating energy consumption. Here we present extensions to the TripEnergy model that fill in the gaps of low-resolution trajectories with realistic, contextual driving behavior. TripEnergy a

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Li, Zilong, and Yang Tang. "Mesoscopic Simulation Method for Uniaxial Compression Test of RCC Dam Material Based on DEM." Mathematical Problems in Engineering 2020 (December 17, 2020): 1–13. http://dx.doi.org/10.1155/2020/6686609.

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The roller compacted concrete (RCC) dam has become one of the most competitive dam types due to its fast construction speed, low cost, and strong adaptability. However, the macroscale compaction test can hardly reflect the mesoscopic structure on the RCC’s rolling characteristics. According to the characteristics of RCC dam materials, a numerical discrete element method (DEM) is proposed in this paper, which is used to simulate the irregular shape and proportion of RCC aggregates. Moreover, a mesoscopic parameter inversion method based on the adaptive differential evolution (ADE) algorithm is

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Biscarini, Chiara, Silvia Di Francesco, Fernando Nardi, and Piergiorgio Manciola. "Detailed Simulation of Complex Hydraulic Problems with Macroscopic and Mesoscopic Mathematical Methods." Mathematical Problems in Engineering 2013 (2013): 1–14. http://dx.doi.org/10.1155/2013/928309.

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The numerical simulation of fast-moving fronts originating from dam or levee breaches is a challenging task for small scale engineering projects. In this work, the use of fully three-dimensional Navier-Stokes (NS) equations and lattice Boltzmann method (LBM) is proposed for testing the validity of, respectively, macroscopic and mesoscopic mathematical models. Macroscopic simulations are performed employing an open-source computational fluid dynamics (CFD) code that solves the NS combined with the volume of fluid (VOF) multiphase method to represent free-surface flows. The mesoscopic model is a

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Zhao, Liang, Chang-Hua Li, Fa-Ning Dang, Chu-Jun Li, and Zhong-Xing Duan. "Concrete CT Image Quick Three-Dimensional Reconstruction Research." International Journal of Pattern Recognition and Artificial Intelligence 31, no. 10 (2017): 1757005. http://dx.doi.org/10.1142/s0218001417570051.

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The research of the mechanical properties of concrete, a kind of heterogeneous composite material, was previously established on basis of the mathematical model of random aggregate, which is used to study and analyze the mesoscopic damage mechanism of concrete. Although the shape and distribution of aggregate in the model built by this method are closer to the real structure of concrete, there is still a big difference between them and the real concrete specimen. In order to solve the problem of large amount of redundant computation in the CT reconstruction of full size cube space, a fast reco

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Koltcov, Sergei, Vera Ignatenko, and Sergei Pashakhin. "Fast Tuning of Topic Models: An Application of Rényi Entropy and Renormalization Theory." Proceedings 46, no. 1 (2019): 5. http://dx.doi.org/10.3390/ecea-5-06674.

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In practice, the critical step in building machine learning models of big data (BD) is costly in terms of time and the computing resources procedure of parameter tuning with a grid search. Due to the size, BD are comparable to mesoscopic physical systems. Hence, methods of statistical physics could be applied to BD. The paper shows that topic modeling demonstrates self-similar behavior under the condition of a varying number of clusters. Such behavior allows using a renormalization technique. The combination of a renormalization procedure with the Rényi entropy approach allows for fast searchi

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Guo, Yutai, Jialong He, Hui Jiang, Yuande Zhou, Feng Jin, and Chongmin Song. "A Simple Approach for Generating Random Aggregate Model of Concrete Based on Laguerre Tessellation and Its Application Analyses." Materials 13, no. 17 (2020): 3896. http://dx.doi.org/10.3390/ma13173896.

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Generating random aggregate models (RAMs) plays a key role in the mesoscopic modelling of concrete-like composite materials. The arbitrary geometry, wide gradation, and high volume ratio of aggregates pose a great challenge for fast and efficient numerical construction of concrete meso-structures. This paper presents a simple strategy for generating RAMs of concrete based on Laguerre tessellation, which mainly consists of three steps: tessellation, geometric smoothing, and scaling. The computer-assisted design (CAD) file of RAMs obtained by the proposed approach can be directly adopted for the

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Köksal Ersöz, Elif, Julien Modolo, Fabrice Bartolomei, and Fabrice Wendling. "Neural mass modeling of slow-fast dynamics of seizure initiation and abortion." PLOS Computational Biology 16, no. 11 (2020): e1008430. http://dx.doi.org/10.1371/journal.pcbi.1008430.

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Epilepsy is a dynamic and complex neurological disease affecting about 1% of the worldwide population, among which 30% of the patients are drug-resistant. Epilepsy is characterized by recurrent episodes of paroxysmal neural discharges (the so-called seizures), which manifest themselves through a large-amplitude rhythmic activity observed in depth-EEG recordings, in particular in local field potentials (LFPs). The signature characterizing the transition to seizures involves complex oscillatory patterns, which could serve as a marker to prevent seizure initiation by triggering appropriate therap

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11

Zhu, Shi Sha, Tao Tang, Xin Zi Tang, Jin Gang Liu, Xue Peng Qian, and Hao He. "Dynamic Modeling and Numerical Simulation of Electrorheological Fluids Based on Lattice Boltzmann Method." Applied Mechanics and Materials 487 (January 2014): 494–99. http://dx.doi.org/10.4028/www.scientific.net/amm.487.494.

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Since the fast response of the internal structure of the Electrorheological (ER) suspension fluids occurs in the controlled space (electrode distance is generally 1-2 mm) of the applied electric field, where the main feature of the ER suspension fluids in the certain time and spatial scales is low shear rate but high flow resistance, which means the Mach number and the Reynolds number are generally small, it can be researched as micro-scale flow. According to this characteristic, the author proposed a discrete-particle-motion model of the ER suspension flows based on the Lattice Boltzmann meth

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12

Zhu, Wen, and Zehua Zhang. "Calibration Method of Normal Critical Damping Ratio in Particle Discrete Element Rock Model." Advances in Engineering Technology Research 1, no. 2 (2022): 514. http://dx.doi.org/10.56028/aetr.1.2.514.

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The calibration of dynamic mesoscopic parameters such as the normal critical damping ratio will directly affect the simulation results when wave velocity dynamic analysis is carried out on the particle discrete element rock model. This paper presents a fast calibration method for the normal critical damping ratio in the particle discrete element model. Firstly, the relationship between the normal critical damping ratio and the model energy attenuation rate is quantitatively analyzed based on the fundamental theory of discrete particle elements and energy conservation law. Then, based on the ro

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Zhu, Wen, and Zehua Zhang. "Calibration Method of Normal Critical Damping Ratio in Particle Discrete Element Rock Model." Advances in Engineering Technology Research 2, no. 1 (2022): 514. http://dx.doi.org/10.56028/aetr.2.1.514.

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The calibration of dynamic mesoscopic parameters such as the normal critical damping ratio will directly affect the simulation results when wave velocity dynamic analysis is carried out on the particle discrete element rock model. This paper presents a fast calibration method for the normal critical damping ratio in the particle discrete element model. Firstly, the relationship between the normal critical damping ratio and the model energy attenuation rate is quantitatively analyzed based on the fundamental theory of discrete particle elements and energy conservation law. Then, based on the ro

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Picotti, Stefano, José M. Carcione, and Mauro Pavan. "Seismic attenuation in Antarctic firn." Cryosphere 18, no. 1 (2024): 169–86. http://dx.doi.org/10.5194/tc-18-169-2024.

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Abstract. We estimate the seismic attenuation of P and S waves in the polar firn and underlying ice by spectral analysis of diving, refracted, and reflected waves from active-source three-component seismic signals obtained in 2010 on the Whillans Ice Stream (WIS), a fast-flowing ice stream in West Antarctica. The resulting quality factors are then successfully modeled using a rock-physics theory of wave propagation that combines White's mesoscopic attenuation theory of interlayer flow with that of Biot/squirt flow. The first theory describes an equivalent viscoelastic medium consisting of a st

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Saroji, Sudarmaji, Budi Eka Nurcahya, and Nivan Ramadhan Sugiantoro. "Vertical to Horizontal Spectral Ratio (VHSR) Response of Seismic Wave Propagation in a Homogeneous Elastic – Poroelastic Medium Using The Spectral Finite Element Method." INDONESIAN JOURNAL OF APPLIED PHYSICS 11, no. 1 (2021): 95. http://dx.doi.org/10.13057/ijap.v11i1.45969.

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<p>Numerical modeling of 2D seismic wave propagation using spectral finite element method to estimate the response of seismic waves passing through the poroelastic medium from a hydrocarbon reservoir has been carried out. A hybrid simple model of the elastic - poroelastic - elastic with a mesoscopic scale element size of about 50cm was created. Seismic waves which was in the form of the ricker function are generated on the first elastic medium, propagated into the poroelastic medium and then transmitted to the second elastic medium. Pororoelastic medium is bearing hydrocarbon fluid in th

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16

Aqil, Marco, Selen Atasoy, Morten L. Kringelbach, and Rikkert Hindriks. "Graph neural fields: A framework for spatiotemporal dynamical models on the human connectome." PLOS Computational Biology 17, no. 1 (2021): e1008310. http://dx.doi.org/10.1371/journal.pcbi.1008310.

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Tools from the field of graph signal processing, in particular the graph Laplacian operator, have recently been successfully applied to the investigation of structure-function relationships in the human brain. The eigenvectors of the human connectome graph Laplacian, dubbed “connectome harmonics”, have been shown to relate to the functionally relevant resting-state networks. Whole-brain modelling of brain activity combines structural connectivity with local dynamical models to provide insight into the large-scale functional organization of the human brain. In this study, we employ the graph La

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Picotti, Stefano, José M. Carcione, and Jing Ba. "Rock-physics templates based on seismic Q." GEOPHYSICS 84, no. 1 (2019): MR13—MR23. http://dx.doi.org/10.1190/geo2018-0017.1.

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We build rock-physics templates (RPTs) for reservoir rocks based on seismic quality factors. In these templates, the effects of partial saturation, porosity, and permeability on the seismic properties are described by generalizing the Johnson mesoscopic-loss model to a distribution of gas-patch sizes in brine- and oil-saturated rocks. This model addresses the wave-induced fluid flow attenuation mechanism, by which part of the energy of the fast P-wave is converted into the slow P (Biot) diffusive mode. We consider patch sizes, whose probability density function is defined by a normal (Gaussian

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18

Fritsch, Anatol W., Andrés F. Diaz-Delgadillo, Omar Adame-Arana, et al. "Local thermodynamics govern formation and dissolution of Caenorhabditis elegans P granule condensates." Proceedings of the National Academy of Sciences 118, no. 37 (2021): e2102772118. http://dx.doi.org/10.1073/pnas.2102772118.

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Membraneless compartments, also known as condensates, provide chemically distinct environments and thus spatially organize the cell. A well-studied example of condensates is P granules in the roundworm Caenorhabditis elegans that play an important role in the development of the germline. P granules are RNA-rich protein condensates that share the key properties of liquid droplets such as a spherical shape, the ability to fuse, and fast diffusion of their molecular components. An outstanding question is to what extent phase separation at thermodynamic equilibrium is appropriate to describe the f

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Cramer, Samuel, Laurentiu Popa, Samuel Haley, et al. "PATH-02. CHARACTERIZATION OF FUNCTIONAL NETWORK EFFECTS IN THE CEREBRAL CORTEX DURING BRAIN TUMORIGENESIS IN THE MOUSE." Neuro-Oncology 22, Supplement_2 (2020): ii164. http://dx.doi.org/10.1093/neuonc/noaa215.684.

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Abstract INTRODUCTION Neuro-cognitive decline is near universal in glioblastoma patients and negatively impacts the quality of life for afflicted patients. Yet, there is little information on longitudinal effects of brain tumor growth on cerebral cortical function and network connectivity. OBJECTIVE To address this knowledge gap, we examined in vivo Ca2+ flux imaging in a transgenic murine glioblastoma model. METHODS Mesoscopic Ca2+ imaging was performed after implant of GL261 glioblastoma cells into a transgenic mice strain (Thy1-GCaMP6f) that expresses the fast calcium indicator GCaMP6f in L

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Cramer, Samuel, Laurentiu Popa, Samuel Haley, et al. "TMOD-10. EFFECT OF BRAIN TUMORIGENESIS ON CEREBRAL CORTICAL FUNCTIONAL CONNECTIVITY IN THE MOUSE." Neuro-Oncology 22, Supplement_2 (2020): ii229—ii230. http://dx.doi.org/10.1093/neuonc/noaa215.961.

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Abstract INTRODUCTION Neuro-cognitive decline is near universal in glioblastoma patients and negatively impacts the quality of life for afflicted patients. Yet, there is little information on longitudinal effects of brain tumor growth on cerebral cortical function and network connectivity. OBJECTIVE To address this knowledge gap, we examined in vivo Ca2+ imaging in a transgenic murine glioblastoma model. METHODS Mesoscopic Ca2+ imaging was performed after implant of GL261 glioblastoma cells into a transgenic mice strain (Thy1-GCaMP6f) that expresses the fast calcium indicator GCaMP6f in Layer

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SUÑE, JORDI, DAVID JIMENEZ, and ENRIQUE MIRANDA. "BREAKDOWN MODES AND BREAKDOWN STATISTICS OF ULTRATHIN SiO2 GATE OXIDES." International Journal of High Speed Electronics and Systems 11, no. 03 (2001): 789–848. http://dx.doi.org/10.1142/s0129156401001003.

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The dielectric breakdown of ultra-thin silicon dioxide films used as gate insulator in MOSFETs is one of the most important reliability issues in CMOS technology. In this paper, two main aspects of oxide breakdown are considered: the modeling of the breakdown statistics and the properties of the two main breakdown modes, namely Soft Breakdown and Hard Breakdown. The most invoked models for the breakdown statistics that relate defect generation and breakdown are reviewed. Particular attention is paid to the percolation models and to a recent cell-based analytic picture. The scaling of the break

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22

Miller, RJ Dwayne. "2000 John C. Polanyi Award LectureMother Nature and the molecular Big Bang." Canadian Journal of Chemistry 80, no. 1 (2002): 1–24. http://dx.doi.org/10.1139/v01-199.

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Biological molecules are mesoscopic systems that bridge the quantum and classical worlds. At the single molecule level, there are often more than 1 × 104 degrees of freedom that are involved in protein-mediated processes. These molecules are sufficiently large that the bath coordinate convolved to the reaction at an active site is defined by the surrounding protein tertiary structure. In this context, the very interatomic forces that determine the active protein structures create a strongly associated system. Thus, the bath fluctuations leading to reactive crossings involve highly hindered mot

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Paulsson, Johan, and Måns Ehrenberg. "Noise in a minimal regulatory network: plasmid copy number control." Quarterly Reviews of Biophysics 34, no. 1 (2001): 1–59. http://dx.doi.org/10.1017/s0033583501003663.

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1. Introduction 22. Plasmid biology 32.1 What are plasmids? 32.2 Evolution of CNC: cost and benefit 42.3 Plasmids are semi-complete regulatory networks 62.4 The molecular mechanisms of CNC for plasmids ColE1 and R1 62.4.1 ColE1 72.4.2 R1 72.5 General simplifying assumptions and values of rate constants 93. Macroscopic analysis 113.1 Regulatory logic of inhibitor-dilution CNC 113.2 Sensitivity amplification 123.3 Plasmid control curves 133.4 Multistep control of plasmid ColE1: exponential control curves 143.5 Multistep control of plasmid R1: hyperbolic control curves 163.6 Time-delays, oscillat

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Riera, Jorge J., Takeshi Ogawa, Takakuni Goto, et al. "Pitfalls in the dipolar model for the neocortical EEG sources." Journal of Neurophysiology 108, no. 4 (2012): 956–75. http://dx.doi.org/10.1152/jn.00098.2011.

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For about six decades, primary current sources of the electroencephalogram (EEG) have been assumed dipolar in nature. In this study, we used electrophysiological recordings from anesthetized Wistar rats undergoing repeated whisker deflections to revise the biophysical foundations of the EEG dipolar model. In a first experiment, we performed three-dimensional recordings of extracellular potentials from a large portion of the barrel field to estimate intracortical multipolar moments generated either by single spiking neurons (i.e., pyramidal cells, PC; spiny stellate cells, SS) or by populations

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Qiu, Yongrong, and Guoxin Zhang. "Stress and damage in concrete induced by pipe cooling at mesoscopic scale." Advances in Mechanical Engineering 9, no. 2 (2017): 168781401769050. http://dx.doi.org/10.1177/1687814017690509.

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Pipe cooling is one of the most important measures of mass concrete temperature control, but pipe cooling has its advantages and disadvantages. Inappropriate pipe-cooling water temperature may result in excessive stress and crack. Considering the fact that concrete is a type of three-phase composite material and the sizes of cooling pipe and aggregate are basically on the same scale, the mesoscopic heterogeneity of concrete may have a great effect on the stress field surrounding the pipe. This article computes the pipe cooling–induced stress and damage and analyzes the differences between the

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Bianciardi, Camilla, Alessia Allevi, and Maria Bondani. "Experimental Validation of the Statistical Properties of Speckled-Speckle Fields in the Mesoscopic Intensity Regime." Applied Sciences 13, no. 7 (2023): 4490. http://dx.doi.org/10.3390/app13074490.

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Several imaging techniques, such as ghost imaging, are based on the use of classical and quantum correlated light states. This fact has encouraged the search for new strategies to produce light states more correlated than the thermal states that are typically used. In this work, we produce and characterize classical states of light with “more than thermal” statistics. Such states are obtained by means of a sequence of two rotating ground-glass disks and by appropriately selecting the speckle field produced at the output of each disk. The experimental results are in excellent agreement with the

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Beltz, Glenn E., and Don M. Lipkin. "A Dislocation Model for the Directional Anisotropy of Grain-Boundary Fracture." MRS Bulletin 25, no. 5 (2000): 21–26. http://dx.doi.org/10.1557/mrs2000.69.

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That fracture is governed by processes occurring over a wide range of length scales has been recognized since the earliest developments of modern fracture mechanics. Griffitha's study of the strength of cracked solids 1,2 is perhaps the earliest example of such multiscale thinking, predating by several decades the first attempts to apply atomistically grounded traction-separation laws to fracture (e.g., the Orowan-Gilman model3,4). Griffith recognized the critical condition for crack extension to be a statement of thermodynamic equilibrium of a cracked solid, representing a balance between the

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Schmickl, Thomas. "Strong Emergence Arising from Weak Emergence." Complexity 2022 (November 25, 2022): 1–17. http://dx.doi.org/10.1155/2022/9956885.

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Predictions of emergent phenomena, appearing on the macroscopic layer of a complex system, can fail if they are made by a microscopic model. This study demonstrates and analyses this claim on a well-known complex system, Conway’s Game of Life. Straightforward macroscopic mean-field models are easily capable of predicting such emergent properties after they have been fitted to simulation data in an after-the-fact way. Thus, these predictions are macro-to-macro only. However, a micro-to-macro model significantly fails to predict correctly, as does the obvious mesoscopic modeling approach. This s

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Penna, Vittorio, Alessandra Contestabile, and Andrea Richaud. "Ground-State Properties and Phase Separation of Binary Mixtures in Mesoscopic Ring Lattices." Entropy 23, no. 7 (2021): 821. http://dx.doi.org/10.3390/e23070821.

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We investigated the spatial phase separation of the two components forming a bosonic mixture distributed in a four-well lattice with a ring geometry. We studied the ground state of this system, described by means of a binary Bose–Hubbard Hamiltonian, by implementing a well-known coherent-state picture which allowed us to find the semi-classical equations determining the distribution of boson components in the ring lattice. Their fully analytic solutions, in the limit of large boson numbers, provide the boson populations at each well as a function of the interspecies interaction and of other si

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Oh, Simon, Ravi Seshadri, Carlos Lima Azevedo, and Moshe E. Ben-Akiva. "Demand Calibration of Multimodal Microscopic Traffic Simulation using Weighted Discrete SPSA." Transportation Research Record: Journal of the Transportation Research Board 2673, no. 5 (2019): 503–14. http://dx.doi.org/10.1177/0361198119842107.

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This paper presents a stochastic approximation framework to solve a generalized problem of off-line calibration of demand for a multimodal microscopic (or mesoscopic) network simulation using aggregated sensor data. A key feature of this problem is that demand, although typically treated as a continuous variable is in fact discrete, particularly in the context of agent-based simulation. To address this, we first use a discrete version of the weighted simultaneous perturbation stochastic approximation (W-DSPSA) algorithm for minimizing a generalized least squares (GLS) objective (that measures

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Philippi, Paulo C., Keijo K. Mattila, Diogo N. Siebert, Luís O. E. dos Santos, Luiz A. Hegele Júnior, and Rodrigo Surmas. "Lattice-Boltzmann equations for describing segregation in non-ideal mixtures." Journal of Fluid Mechanics 713 (October 26, 2012): 564–87. http://dx.doi.org/10.1017/jfm.2012.473.

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AbstractIn fluid mechanics, multicomponent fluid systems are generally treated either as homogeneous solutions or as completely immiscible parts of a multiphasic system. In immiscible systems, the main task in numerical simulations is to find the location of the interface evolving over time, driven by normal and tangential surface forces. The lattice-Boltzmann method (LBM), on the other hand, is based on a mesoscopic description of the multicomponent fluid systems, and appears to be a promising framework that can lead to realistic predictions of segregation in non-ideal mixtures of partially m

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Gorshkov, Vyacheslav N., Mykola O. Stretovych, Valerii F. Semeniuk, et al. "Hierarchical Structuring of Black Silicon Wafers by Ion-Flow-Stimulated Roughening Transition: Fundamentals and Applications for Photovoltaics." Nanomaterials 13, no. 19 (2023): 2715. http://dx.doi.org/10.3390/nano13192715.

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Ion-flow-stimulated roughening transition is a phenomenon that may prove useful in the hierarchical structuring of nanostructures. In this work, we have investigated theoretically and experimentally the surface texturing of single-crystal and multi-crystalline silicon wafers irradiated using ion-beam flows. In contrast to previous studies, ions had relatively low energies, whereas flow densities were high enough to induce a quasi-liquid state in the upper silicon layers. The resulting surface modifications reduced the wafer light reflectance to values characteristic of black silicon, widely us

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Barbosa, Hélder M. C., Marta M. D. Ramos, and Helena M. G. Correia. "Computational Study of the Influence of Polymer/Polymer Interface Formation on Bilayer-LED Functioning." Materials Science Forum 636-637 (January 2010): 325–31. http://dx.doi.org/10.4028/www.scientific.net/msf.636-637.325.

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The actual interest on polymer light emitting diodes (PLEDs) is based on the fact that they are easy to process, which reduces the cost of fabrication and thus opening a new branch in the electronic market – the low-cost electronics. However, these devices present a limited efficiency compared to their inorganic counterparts mainly due to the unbalanced charge injection, which reduces the fluorescence emission. One of the first strategies to improve PLEDs efficiency was using a bilayer structure composed by two polymers to improve charge injection and transport, and at the same time tune charg

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Verga, F. M., G. Giglio, F. Masserano, and L. Ruvo. "Validation of Near-Wellbore Fracture-Network Models With MDT." SPE Reservoir Evaluation & Engineering 5, no. 02 (2002): 116–25. http://dx.doi.org/10.2118/77298-pa.

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Summary A new approach was attempted to validate the reconstructed internal geometry of a fractured reservoir by reproducing the reservoir dynamic behavior monitored during modular dynamic tests (MDTs). The description of the reservoir fracture network was achieved by integrating relevant data that could be collected from wireline logs, conventional cores, small drilling-mud-loss analysis, and field-scale observations from outcrop analog inspection. Fracture types, properties, and distributions were thus defined, and a static model of the fractured reservoir was generated stochastically. The d

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Shi Zhi-Qi, He Xiao, Liu Lin, and Chen De-Hua. "Wavefield simulation and analysis with finite difference method in partially saturated double-porosity media." Acta Physica Sinica, 2024, 0. http://dx.doi.org/10.7498/aps.73.20240227.

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Double-porosity poroelastic models, which account for the effect of mesoscopic flow in heterogeneous rocks on wave dispersion and attenuation, are useful for quantitative seismic interpretation. Wavefield simulation based on double-porosity models not only helps visualize the propagation characteristics of the elastic waves but also lays the foundation for seismic imaging. In this paper, we perform wavefield simulation and analysis based on the Santos-Rayleigh model which incorporates mesoscopic and global flow in partially-saturated double-porosity media. Specifically, the mesoscopic flow mec

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HATZOGLOU, Constantinos, Benjamin Klaes, Fabien Delaroche, et al. "A mesoscopic modelling of field evaporation on atom probe tomography." Journal of Physics D: Applied Physics, May 17, 2023. http://dx.doi.org/10.1088/1361-6463/acd649.

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Abstract Reconstructions in Atom Probe Tomography (APT) are biased by image distortions arising from dynamic changes of the specimen geometry that controls image projection. Despite the strong efforts to build realistic models for understanding and reproducing image artefacts, current models are too slow or not adapted to be routinely used in image correction approaches. To understand the APT imaging process for real size samples submitted to realistic experimental conditions of electric field and temperature, we propose an alternative simulation tool based on a coarse-grained model of the sam

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Corbin, Gregor, Axel Klar, Christina Surulescu, et al. "Modeling glioma invasion with anisotropy- and hypoxia-triggered motility enhancement: From subcellular dynamics to macroscopic PDEs with multiple taxis." Mathematical Models and Methods in Applied Sciences, December 28, 2020, 1–46. http://dx.doi.org/10.1142/s0218202521500056.

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We deduce a model for glioma invasion that accounts for the dynamics of brain tissue being actively degraded by tumor cells via excessive acidity production, but also according to the local orientation of tissue fibers. Our approach has a multiscale character: we start with a microscopic description of single cell dynamics including biochemical and/or biophysical effects of the tumor microenvironment, translated on the one hand into cell stress and corresponding forces and on the other hand into receptor binding dynamics. These lead on the mesoscopic level to kinetic equations involving transp

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Venkadesh, Siva, Asmir Shaikh, Heman Shakeri, Ernest Barreto, and John Darrell Van Horn. "Biophysical modulation and robustness of itinerant complexity in neuronal networks." Frontiers in Network Physiology 4 (March 7, 2024). http://dx.doi.org/10.3389/fnetp.2024.1302499.

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Transient synchronization of bursting activity in neuronal networks, which occurs in patterns of metastable itinerant phase relationships between neurons, is a notable feature of network dynamics observed in vivo. However, the mechanisms that contribute to this dynamical complexity in neuronal circuits are not well understood. Local circuits in cortical regions consist of populations of neurons with diverse intrinsic oscillatory features. In this study, we numerically show that the phenomenon of transient synchronization, also referred to as metastability, can emerge in an inhibitory neuronal

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Wagner, Manfred H., Esmaeil Narimissa, and Yuichi Masubuchi. "Elongational viscosity of poly(propylene carbonate) melts: tube-based modelling and primitive chain network simulations." Rheologica Acta, November 12, 2022. http://dx.doi.org/10.1007/s00397-022-01373-w.

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Abstract In fast elongational flows, linear polymer melts exhibit a monotonic decrease of the viscosity with increasing strain rate, even beyond the contraction rate of the polymer defined by the Rouse time. We consider two possible explanations of this phenomenon: (a) the reduction of monomeric friction and (b) the reduction of the tube diameter with increasing deformation leading to an Enhanced Relaxation of Stretch (ERS) on smaller length scales. (Masubuchi et al. (2022) reported Primitive Chain Network (PCN) simulations using an empirical friction reduction model depending on segmental ori

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Rohwerder, M., E. Hornung, and Xing-Wen Yu. "Delamination of Poylmer Coatings from Metal Substrates: Submicroscopic and Molecular Aspects." MRS Proceedings 734 (2002). http://dx.doi.org/10.1557/proc-734-b2.8.

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Delamination of organic coatings from metal surfaces can occur in a number of different ways, e.g. as pure cathodic delamination, as Filiform corrosion or a mixture of these. In fact, in most technical systems the pure cases are the exception and, of course, delamination is usually very slow. It has been shown that in fast delaminating systems the length scales may range between several 100 μm and several millimetres, while in systems which show slow delamination the reaction zones can be confined to submicroscopic distances [1]. This underlines the importance of investigation methods with sub

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Francis, Robert J., Gillian Robb, Lee McCann, et al. "Three-dimensional in situ morphometrics of Mycobacterium tuberculosis infection within lesions by optical mesoscopy and novel acid-fast staining." Scientific Reports 10, no. 1 (2020). http://dx.doi.org/10.1038/s41598-020-78640-4.

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AbstractTuberculosis (TB) preclinical testing relies on in vivo models including the mouse aerosol challenge model. The only method of determining colony morphometrics of TB infection in a tissue in situ is two-dimensional (2D) histopathology. 2D measurements consider heterogeneity within a single observable section but not above and below, which could contain critical information. Here we describe a novel approach, using optical clearing and a novel staining procedure with confocal microscopy and mesoscopy, for three-dimensional (3D) measurement of TB infection within lesions at sub-cellular

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Wang, Enjiang, Lin Zhang, José M. Carcione, and Jing Ba. "Effect of mesoscopic-flow loss on seismic reflections in media with penny-shaped inclusions." Geophysical Journal International, July 8, 2022. http://dx.doi.org/10.1093/gji/ggac261.

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Summary We obtain the amplitude and energy reflection coefficients of seismic waves in porous media with penny-shaped inclusions, based on the generalized Biot-Rayleigh model that takes into account the attenuation due to mesoscopic local fluid flow (LFF). We consider two cases, including a contact between two porous media having either different fluids (gas-water contact) or crack density/aspect ratio, as well as a water half-space overlying a porous medium, and study the frequency-dependent reflection-transmission (scattering) coefficients for open- and sealed-pore boundary conditions. Our e

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Chung, Brandon, Adam Schwartz, Bartley Ebbinghaus та ін. "Spectroscopic Signature of Aging in δ-Pu(Ga)". MRS Proceedings 893 (2005). http://dx.doi.org/10.1557/proc-0893-jj03-04.

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AbstractPlutonium, because of its radioactive nature, ages from the “inside out” by means of self-irradiation damage and thus produces nanoscale internal defects. The self-irradiation induced defects come in the form of Frenkel-type defects (vacancies and self-interstitial atoms), helium in-growth, and defect clusters. At present there are neither experimental nor theoretical models describing the changes in the electronic structure caused by the aging in Pu. This fact appears to be associated primarily with the absence of reasonably convincing spectroscopic evidence of the changes. This paper

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Abdul-Latif, A., and M. Chadli. "Determinist-Probabilistic Concept in Modeling Fatigue Damage Through a Micromechanical Approach." Journal of Engineering Materials and Technology 132, no. 1 (2009). http://dx.doi.org/10.1115/1.3184029.

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Motivated by a micromechanical determinist-probabilistic model coupled with damage recently developed by the authors, a new generalization is proposed to describe the nonlinear elasto-inelastic cyclic strain-stress behavior of polycrystals notably under biaxial cyclic loading paths. In this context, this generalization considers a compressible and linear anisotropic granular elastic strain behavior coupled with damage. The model is expressed in the framework of the time dependent plasticity for a small strain assumption. It is assumed that a damage variable initiates at the mesoscopic (granula

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Bai Jian-Nan, Han Song, Chen Jian-Di, Han Hai-Yan, and Yan Dong. "Correlated collective excitation and quantum entanglement between two Rydberg superatoms in the steady state." Acta Physica Sinica, 2023, 0. http://dx.doi.org/10.7498/aps.72.20222030.

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Owing to the unique physical characteristics of Rydberg atoms, which play an important role in quantum information and quantum computation, the theoretical and applied research of Rydberg atoms have become one of the hot spots of scientific research in recent years. Thanks to the large polarizability of Rydberg atoms, even a small electric field could cause a considerable electric dipole moment, resulting in a strong dipole-dipole interaction between Rydberg atoms. The multiple excitations of the Rydberg states are strongly inhibited because of the strong dipole interaction between atoms withi

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Ogurtani, Tarik Omer. "Mesoscopic irreversible thermodynamics of aging kinetics of alpha polypeptides [DNA] under various constraints: Special reference to the simple spring mechanics." AIP Advances 14, no. 2 (2024). http://dx.doi.org/10.1063/5.0183144.

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The mesoscopic irreversible thermodynamic treatment of α-polypeptides and the helical polynucleotides (DNA) furnishes two sets of analytical expressions, which allow us not only to analyze the reversible force–extension experiments performed by atomic force microscopy (AFM) but also to predict the irreversible “aging” kinetics of the single-stranded and double-stranded polynucleotides (ssDNA and dsDNA) helical conformations exposed to aqueous solutions and applied static stress systems under the various constraints. The present physicochemical cage model emphasizes the fact that the global Hel

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Ovečka, Miroslav, Jiří Sojka, Michaela Tichá, et al. "Imaging plant cells and organs with light-sheet and super-resolution microscopy." Plant Physiology, August 26, 2021. http://dx.doi.org/10.1093/plphys/kiab349.

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Abstract The documentation of plant growth and development requires integrative and scalable approaches to investigate and spatiotemporally resolve various dynamic processes at different levels of plant body organization. The present update deals with vigorous developments in mesoscopy, microscopy and nanoscopy methods that have been translated to imaging of plant subcellular compartments, cells, tissues and organs over the past 3 years with the aim to report recent applications and reasonable expectations from current light-sheet fluorescence microscopy (LSFM) and super-resolution microscopy

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