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Artykuły w czasopismach na temat „Contrasting diffusivity”

Autor: Grafiati

Data publikacji: 6 września 2023

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1

Lai, King C., and James W. Evans. "Complex oscillatory decrease with size in diffusivity of {100}-epitaxially supported 3D fcc metal nanoclusters." Nanoscale 11, no. 37 (2019): 17506–16. http://dx.doi.org/10.1039/c9nr05845a.

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Gaudiello, Antonio, and Ali Sili. "Homogenization of Highly Oscillating Boundaries with Strongly Contrasting Diffusivity." SIAM Journal on Mathematical Analysis 47, no. 3 (2015): 1671–92. http://dx.doi.org/10.1137/140987225.

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Sili, Ali. "Diffusion through a composite structure with a high contrasting diffusivity." Asymptotic Analysis 89, no. 1-2 (2014): 173–87. http://dx.doi.org/10.3233/asy-141241.

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Nandakumaran, A. K., and Abu Sufian. "Strong contrasting diffusivity in general oscillating domains: Homogenization of optimal control problems." Journal of Differential Equations 291 (August 2021): 57–89. http://dx.doi.org/10.1016/j.jde.2021.04.031.

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Perriot, Romain, and Blas P. Uberuaga. "Structural vs. intrinsic carriers: contrasting effects of cation chemistry and disorder on ionic conductivity in pyrochlores." Journal of Materials Chemistry A 3, no. 21 (2015): 11554–65. http://dx.doi.org/10.1039/c5ta01692d.

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Cation disorder liberates and enhances the mobility of structural carriers in pyrochlores. However, depending on the chemistry and type of defect, antisites can trap intrinsic carriers, and reduce the diffusivity.

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Sili, Ali. "Diffusion through a composite medium with a semi-periodic structure and high contrasting diffusivity." Asymptotic Analysis 98, no. 4 (2016): 309–24. http://dx.doi.org/10.3233/asy-161370.

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Sharma, Manju, and S. Yashonath. "How does contrasting dependence of impurity-atom diffusivity on the density of host disordered medium arise?" Indian Journal of Physics 83, no. 1 (2009): 31–47. http://dx.doi.org/10.1007/s12648-009-0002-6.

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Jarníková, Tereza, Elise M. Olson, Susan E. Allen, Debby Ianson, and Karyn D. Suchy. "A clustering approach to determine biophysical provinces and physical drivers of productivity dynamics in a complex coastal sea." Ocean Science 18, no. 5 (2022): 1451–75. http://dx.doi.org/10.5194/os-18-1451-2022.

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Abstract. The balance between ocean mixing and stratification influences primary productivity through light limitation and nutrient supply in the euphotic ocean. Here, we apply a hierarchical clustering algorithm (Ward's method) to four factors relating to stratification (wind energy, freshwater index, water-column-averaged vertical eddy diffusivity, and halocline depth), as well as to depth-integrated phytoplankton biomass, extracted from a biophysical ocean model of the Salish Sea. Running the clustering algorithm on 4 years of model output, we identify distinct regions of the model domain t

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9

Ma, Ke, Mathijs Janssen, Cheng Lian, and René van Roij. "Dynamic density functional theory for the charging of electric double layer capacitors." Journal of Chemical Physics 156, no. 8 (2022): 084101. http://dx.doi.org/10.1063/5.0081827.

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We consider the charging of a model capacitor comprised of two planar electrodes and an electrolyte. Upon switching on a voltage difference, electric double layers build up in this setup, which we characterize with a classical dynamic density functional theory (DDFT) that accounts for electrostatic correlations and for molecular excluded volume of finite-sized ions and solvent molecules. Our DDFT predicts the electrode charge Q( t) to form exponentially with two timescales: at early times, the system relaxes on the RC time, namely, λ D L/[ D(2 + σ/ λ D)], with λ D being the Debye length, L bei

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10

Hariri, Saeed. "Near-Surface Transport Properties and Lagrangian Statistics during Two Contrasting Years in the Adriatic Sea." Journal of Marine Science and Engineering 8, no. 9 (2020): 681. http://dx.doi.org/10.3390/jmse8090681.

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This paper describes the near-surface transport properties and Lagrangian statistics in the Adriatic semi-enclosed basin using synthetic drifters. Lagrangian transport models were used to simulate synthetic trajectories from the mean flow fields obtained by the Massachusetts Institute of Technology general circulation model (MITgcm), implemented in the Adriatic from October 2006 until December 2008. In particular, the surface circulation properties in two contrasting years (2007 had a mild winter and cold fall, while 2008 had a normal winter and hot summer) are compared here. In addition, the

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Mesarchaki, E., C. Kräuter, K. E. Krall, et al. "Measuring air–sea gas-exchange velocities in a large-scale annular wind–wave tank." Ocean Science 11, no. 1 (2015): 121–38. http://dx.doi.org/10.5194/os-11-121-2015.

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Abstract. In this study we present gas-exchange measurements conducted in a large-scale wind–wave tank. Fourteen chemical species spanning a wide range of solubility (dimensionless solubility, α = 0.4 to 5470) and diffusivity (Schmidt number in water, Scw = 594 to 1194) were examined under various turbulent (u10 = 0.73 to 13.2 m s−1) conditions. Additional experiments were performed under different surfactant modulated (two different concentration levels of Triton X-100) surface states. This paper details the complete methodology, experimental procedure and instrumentation used to derive the t

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12

Mesarchaki, E., C. Kräuter, K. E. Krall, et al. "Measuring air–sea gas exchange velocities in a large scale annular wind-wave tank." Ocean Science Discussions 11, no. 3 (2014): 1643–89. http://dx.doi.org/10.5194/osd-11-1643-2014.

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Abstract. In this study we present gas exchange measurements conducted in a large scale wind-wave tank. Fourteen chemical species spanning a wide range of solubility (dimensionless solubility, α = 0.4 to 5470) and diffusivity (Schmidt number in water, Scw = 594 to 1194) were examined under various turbulent (u10 = 0.8 to 15 m s−1 conditions. Additional experiments were performed under different surfactant modulated (two different concentration levels of Triton X-100) surface states. This paper details the complete methodology, experimental procedure and instrumentation used to derive the total

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13

Sihi, Debjani, Xiaofeng Xu, Mónica Salazar Ortiz, et al. "Representing methane emissions from wet tropical forest soils using microbial functional groups constrained by soil diffusivity." Biogeosciences 18, no. 5 (2021): 1769–86. http://dx.doi.org/10.5194/bg-18-1769-2021.

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Abstract. Tropical ecosystems contribute significantly to global emissions of methane (CH4), and landscape topography influences the rate of CH4 emissions from wet tropical forest soils. However, extreme events such as drought can alter normal topographic patterns of emissions. Here we explain the dynamics of CH4 emissions during normal and drought conditions across a catena in the Luquillo Experimental Forest, Puerto Rico. Valley soils served as the major source of CH4 emissions in a normal precipitation year (2016), but drought recovery in 2015 resulted in dramatic pulses in CH4 emissions fr

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14

Tao, Peng, and Xiao Lin Shu. "Multiple Helium Atoms Diffusion in Tungsten: A Molecular Dynamic Simulation." Materials Science Forum 789 (April 2014): 549–53. http://dx.doi.org/10.4028/www.scientific.net/msf.789.549.

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The diffusion process of multiple He atoms in W is simulated by a molecular dynamics (MD) method with the W-H-He analytic bond-order potential. The diffusivities of different number of helium (He) atoms in W are determined by the mean squared displacement (MSD) method at different temperatures. The diffusivity-temperature (D-T) relationship is fitted to the Arrhenius equation to obtain the pre-factor and the diffusion barrier. Under the temperature of 1200K He atoms diffuse together, and above 1200K they separate from each other. When the number of He atoms is greater than three, all He atoms

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15

Badin, Gualtiero, Richard G. Williams, Zhao Jing, and Lixin Wu. "Water Mass Transformations in the Southern Ocean Diagnosed from Observations: Contrasting Effects of Air–Sea Fluxes and Diapycnal Mixing." Journal of Physical Oceanography 43, no. 7 (2013): 1472–84. http://dx.doi.org/10.1175/jpo-d-12-0216.1.

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Abstract Transformation and formation rates of water masses in the Southern Ocean are estimated in a neutral-surface framework using air–sea fluxes of heat and freshwater together with in situ estimates of diapycnal mixing. The air–sea fluxes are taken from two different climatologies and a reanalysis dataset, while the diapycnal mixing is estimated from a mixing parameterization applied to five years of Argo float data. Air–sea fluxes lead to a large transformation directed toward lighter waters, typically from −45 to −63 Sv (1 Sv ≡ 106 m3 s−1) centered at γ = 27.2, while interior diapycnal m

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16

Chen, Bingzhang, and Sherwood Lan Smith. "CITRATE 1.0: Phytoplankton continuous trait-distribution model with one-dimensional physical transport applied to the North Pacific." Geoscientific Model Development 11, no. 1 (2018): 467–95. http://dx.doi.org/10.5194/gmd-11-467-2018.

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Abstract. Diversity plays critical roles in ecosystem functioning, but it remains challenging to model phytoplankton diversity in order to better understand those roles and reproduce consistently observed diversity patterns in the ocean. In contrast to the typical approach of resolving distinct species or functional groups, we present a ContInuous TRAiT-basEd phytoplankton model (CITRATE) that focuses on macroscopic system properties such as total biomass, mean trait values, and trait variance. This phytoplankton component is embedded within a nitrogen–phytoplankton-zooplankton–detritus–iron m

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17

Costa, Felipe D., Otávio C. Acevedo, Luiz E. Medeiros, et al. "Stable Boundary Layer Regimes in Single-Column Models." Journal of the Atmospheric Sciences 77, no. 6 (2020): 2039–54. http://dx.doi.org/10.1175/jas-d-19-0218.1.

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Abstract Two contrasting flow regimes exist in the stable boundary layer (SBL), as evidenced from both observational and modeling studies. In general, numerical schemes such as those used in numerical weather prediction and climate models (NWPCs) reproduce a transition between SBL regimes. However, the characteristics of such a transition depend on the turbulence parameterizations and stability functions used to represent the eddy diffusivity in the models. The main goal of the present study is to detail how the two SBL regimes occur in single-column models (SCMs) by analyzing the SBL structur

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18

Ranjitha Ruttala, Pratik Purohit, AninditaBhattacharjee, BinduKumari, and Prasun K. Roy. "MRI-DTI Imaging Reveals Specific Neuro-degeneration Signature in Precuneus Node of Awareness Processing in Brain under Alzheimer’s Disease." JOURNAL OF ADVANCED APPLIED SCIENTIFIC RESEARCH 4, no. 4 (2022): 102–11. http://dx.doi.org/10.46947/joaasr442022460.

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Introduction:Alzheimer's disease(AD) displays progressive neurodegenerative atrophy, causing neuronal lossaffecting cognitive skills and memory. As precuneus is associated with episodic memory and is the reflexive self-awareness hub node, we consider precuneus as region-of-interest(ROI) for analysing AD.Objective:The main objective is find AD-caused alteration in nerve fibres, using diffusion tensor imaging(DTI) parameters like Mean Diffusivity(MD), Fractional Anisotropy(FA), and Nerve-tract Parameters, as number, length, volume, density, and thus, analyse the effect on precuneus by AD [when c

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19

Nandakumaran, A. K., and Ali Sili. "Homogenization of a hyperbolic equation with highly contrasting diffusivity coefficients." Differential and Integral Equations 29, no. 1/2 (2016). http://dx.doi.org/10.57262/die/1448323252.

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Stewart, Andrew L., Nicole K. Neumann, and Aviv Solodoch. "“Eddy” Saturation of the Antarctic Circumpolar Current by Standing Waves." Journal of Physical Oceanography, January 23, 2023. http://dx.doi.org/10.1175/jpo-d-22-0154.1.

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Abstract It is now well established that changes in the zonal wind stress over the ACC do not lead to changes in its baroclinicity nor baroclinic transport, a phenomenon referred to as “eddy saturation”. Previous studies provide contrasting dynamical mechanisms for this phenomenon: on one extreme, changes in the winds lead to changes the efficiency with which transient eddies transfer momentum to the sea floor; on the other, structural adjustments of the ACC’s standing meanders increase the efficiency of momentum transfer. In this study the authors investigate the relative importance of these

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21

Nandakumaran, A. K., Abu Sufian, and Renjith Thazhathethil. "Homogenization with strong contrasting diffusivity in a circular oscillating domain with $$L^1$$ source term." Annali di Matematica Pura ed Applicata (1923 -), September 9, 2022. http://dx.doi.org/10.1007/s10231-022-01259-x.

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Park, Sohee, Young-Kyun Kwon, Mina Yoon та Changwon Park. "Role of Sr doping and external strain on relieving bottleneck of oxygen diffusion in La2−xSrxCuO4−δ". Scientific Reports 12, № 1 (2022). http://dx.doi.org/10.1038/s41598-022-17376-9.

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AbstractIn many complex oxides, the oxygen vacancy formation is a promising route to modify the material properties such as a superconductivity and an oxygen diffusivity. Cation substitutions and external strain have been utilized to control the concentration and diffusion of oxygen vacancies, but the mechanisms behind the controls are not fully understood. Using first-principles calculations, we find how Sr doping and external strain greatly enhances the diffusivity of oxygen vacancies in La2−xSrxCuO4−δ (LSCO) in the atomic level. In hole-doped case (2x > δ), the formation energy of an api

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23

Nelson, Mark C., Jessica Royer, Wen Da Lu, et al. "The Human Brain Connectome Weighted by the Myelin Content and Total Intra-Axonal Cross-Sectional Area of White Matter Tracts." Network Neuroscience, August 2, 2023, 1–68. http://dx.doi.org/10.1162/netn_a_00330.

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Abstract A central goal in neuroscience is the development of a comprehensive mapping between structural and functional brain features which facilitates mechanistic interpretation of brain function. However, the interpretability of structure-function brain models remains limited by a lack of biological detail. Here, we characterize human structural brain networks weighted by multiple white matter microstructural features including total intra-axonal cross-sectional area and myelin content. We report edge-weight-dependent spatial distributions, variance, small-worldness, rich club, hubs, as wel

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24

Mungoven, Tiffani J., Noemi Meylakh, Vaughan G. Macefield, Paul M. Macey, and Luke A. Henderson. "Alterations in brain structure associated with trigeminal nerve anatomy in episodic migraine." Frontiers in Pain Research 3 (July 18, 2022). http://dx.doi.org/10.3389/fpain.2022.951581.

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The pathophysiology of migraine remains to be elucidated. We have recently shown that interictal migraineurs exhibit reduced fractional anisotropy (FA) in the root entry zone of the trigeminal nerve when compared to controls, but it is not known if this altered nerve anatomy is associated with changes within the brainstem or higher cortical brain regions. Diffusion tensor imaging of the brain was used to calculate regional measures of structure, including mean diffusivity (MD), axial diffusivity (AX) and radial diffusivity (RD) in addition to voxel-based morphometry of T1-weighted anatomical i

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Dong, Dong, Koichi Hosomi, Nobuhiko Mori, et al. "White matter microstructural alterations in patients with neuropathic pain after spinal cord injury: a diffusion tensor imaging study." Frontiers in Neurology 14 (August 24, 2023). http://dx.doi.org/10.3389/fneur.2023.1241658.

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BackgroundThrough contrastive analysis, we aimed to identify the white matter brain regions that show microstructural changes in patients with neuropathic pain (NP) after spinal cord injury (SCI).MethodsWe categorized patients with SCI into NP (n = 30) and non-NP (n = 15) groups. We extracted diffusion tensor maps of fractional anisotropy (FA) and mean (MD), axial (AD), and radial (RD) diffusivity. A randomization-based method in tract-based spatial statistics was used to perform voxel-wise group comparisons among the FA, MD, AD, and RD for nonparametric permutation tests.ResultsAtlas-based an

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