Sensitivity and uncertainty analysis for flexoelectric nanostructures

Hamdia, Khader M.; Ghasemi, Hamid; Zhuang, Xiaoying; Alajlan, Naif; Rabczuk, Timon

doi:10.1016/j.cma.2018.03.016

Cited by 177 publications

(46 citation statements)

References 49 publications

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“…There is an urgent need to conduct further research into multifunctional testing device for direct measurement of material parameters. An uncertainty analysis as done in [36][37][38] might be helpful. From the above analysis it is notable that when cluster is adopted, lower values for rolling friction coefficient µ r and surface energy k are required to obtain a good match between the experiment and DEM simulation.…”

Section: Discussionmentioning

confidence: 99%

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The Construction of Equivalent Particle Element Models for Conditioned Sandy Pebble

et al. 2019

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When a shield tunneling machine based on earth pressure balance (EPB) bores through the sandy pebble stratum, the conditioned sandy pebble inside the soil cabin of shield machine is an aggregation of numerous granules with pebble grains as skeleton. It is essential to construct a reasonable particle element model of the conditioned sandy pebble before carrying out discrete element simulation of the soil cabin system. Sandy pebble belongs to a kind of frictional material, the friction behavior of which is highly sensitive to the angularity of the grains. In order to take the shape effect into account, two particle element models—single sphere with rolling resistance and cluster of particles—were attempted in this paper. The undetermined contact parameters in two models were calibrated by virtue of least squares support vector regression machine (LS-SVR). With the purpose of making both the flow behavior and mechanical properties of the modeled soil consistent with reality, the calibration targets the result of laboratory test of slump test and large-scale triaxial test as goals. The presented comparative analysis indicates that the two established particle models both can well describe the strength property and fluidity of the actual soil due to properly calibrated parameters. So, the rolling resistance and cluster models are two effective ways to incorporate the shape effect. Besides, because of the angularity of the nonspherical grains, there exists strong interlocking between clusters. So, in the cluster model, relatively smaller rolling friction coefficient and surface energy are required. It is also concluded that the single sphere model is more computationally efficient than the cluster model.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The Construction of Equivalent Particle Element Models for Conditioned Sandy Pebble

et al. 2019

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“…), are normally used as sensitivity indices in the Morris method, where µ represents the degree of parameter sensitivity and σ represents the level of interaction between the factor and other factors. Further details can be found in Saltelli et al [45] and [46][47][48][49][50][51].…”

Section: Morris Methodsmentioning

confidence: 99%

Multi-Objective Calibration of a Distributed Hydrological Model in a Highly Glacierized Watershed in Central Asia

Fang

Jian

Chen

2019

Water

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Understanding glacio-hydrological processes is crucial to water resources management, especially under increasing global warming. However, data scarcity makes it challenging to quantify the contribution of glacial melt to streamflow in highly glacierized catchments such as those in the Tienshan Mountains. This study aims to investigate the glacio-hydrological processes in the SaryDjaz-Kumaric River (SDKR) basin in Central Asia by integrating a degree-day glacier melt algorithm into the macro-scale hydrological Soil and Water Assessment Tool (SWAT) model. To deal with data scarcity in the alpine area, a multi-objective sensitivity analysis and a multi-objective calibration procedure were used to take advantage of all aspects of streamflow. Three objective functions, i.e., the Nash–Sutcliffe efficiency coefficient of logarithms (LogNS), the water balance index (WBI), and the mean absolute relative difference (MARD), were considered. Results show that glacier and snow melt-related parameters are generally sensitive to all three objective functions. Compared to the original SWAT model, simulations with a glacier module match fairly well to the observed streamflow, with the Nash–Sutcliffe efficiency coefficient (NS) and R2 approaching 0.82 and an absolute percentage bias less than 1%. Glacier melt contribution to runoff is 30–48% during the simulation period. The approach of combining multi-objective sensitivity analysis and optimization is an efficient way to identify important hydrological processes and recharge characteristics in highly glacierized catchments.

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“…dynamiek en vele interacties tussen biotische en abiotische factoren, herbergt het gebied een unieke diversiteit aan planten-en diersoorten, waarvan sommige sterk gebonden zijn aan het specifieke waddenhabitat. De Waddenzee is daarom beschermd onder verschillende internationale verdragen (Common Wadden Sea Secretariat, 2016;Ministerie van Infrastructuur en Milieu and Rijkswaterstaat Noord-Nederland, 2016;Ramsar Convention, 2013;Salverda and Chardon, 2006). Een van de bijzonder habitats van de Waddenzee wordt gevormd door het clusteren van de gewone mossel (Mytilus edulis).…”

Section: Mosselbanken In De Waddenzeeunclassified

Percepties van een Rijke Waddenzee : Van dynamisch en productief tot soortenrijk en ongerept

Koning¹,

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Steins³

et al. 2019

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Wageningen Marine Research aanvaardt geen aansprakelijkheid voor gevolgschade, noch voor schade welke voortvloeit uit toepassingen van de resultaten van werkzaamheden of andere gegevens verkregen van Wageningen Marine Research opdrachtgever vrijwaart Wageningen Marine Research van aanspraken van derden in verband met deze toepassing. Alle rechten voorbehouden. Niets uit deze uitgave mag weergegeven en/of gepubliceerd worden, gefotokopieerd of op enige andere manier gebruikt worden zonder schriftelijke toestemming van de uitgever of auteur.

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Sensitivity and uncertainty analysis for flexoelectric nanostructures

Cited by 177 publications

References 49 publications

The Construction of Equivalent Particle Element Models for Conditioned Sandy Pebble

The Construction of Equivalent Particle Element Models for Conditioned Sandy Pebble

Multi-Objective Calibration of a Distributed Hydrological Model in a Highly Glacierized Watershed in Central Asia

Percepties van een Rijke Waddenzee : Van dynamisch en productief tot soortenrijk en ongerept

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