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Trajectory optimization with constraints for alpine skiers based on multi-phase nonlinear optimal control

Cong-ying Cai, Xiao-lan Yao,yaoxiaolan@bit.edu.cn

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 10, Pages 1413-1534 doi: 10.1631/FITEE.1900586

Abstract: The original problem is converted into a multi-phase nonlinear problem solved with a , and the trajectory

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Application of a weakly compressible smoothed particle hydrodynamics multi-phase model to non-cohesive

Rasoul MEMARZADEH, Gholamabbas BARANI, Mahnaz GHAEINI-HESSAROEYEH

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 3, Pages 412-424 doi: 10.1007/s11709-017-0432-8

Abstract: application of mesh free Lagrangian two-dimensional non-cohesive sediment transport model applied to a two-phasemovement of sediment particles, the model considers a powerful two-part technique; when the sediment phase

Keywords： WCSPH method non-cohesive sediment transport rheological model two-part technique two-phase dam break

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Fundamental influences of particles on stirred and unstirred venting processes of foaming systems

Henrik LEIMEISTER,Jörg STEINBACH

Frontiers of Chemical Science and Engineering 2014, Volume 8, Issue 2, Pages 141-148 doi: 10.1007/s11705-014-1423-0

Abstract: and should have been accounted for did ignore their presence; the scenarios were treated like a two-phase

Keywords： venting multi-phase

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Maximum entropy based finite element analysis of porous media

Emad NOROUZI, Hesam MOSLEMZADEH, Soheil MOHAMMADI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2, Pages 364-379 doi: 10.1007/s11709-018-0470-x

Abstract: The maximum entropy theory has been used in a wide variety of physical, mathematical and engineering applications in the past few years. However, its application in numerical methods, especially in developing new shape functions, has attracted much interest in recent years. These shape functions possess the potential for performing better than the conventional basis functions in problems with randomly generated coarse meshes. In this paper, the maximum entropy theory is adopted to spatially discretize the deformation variable of the governing coupled equations of porous media. This is in line with the well-known fact that higher-order shape functions can provide more stable solutions in porous problems. Some of the benchmark problems in deformable porous media are solved with the developed approach and the results are compared with available references.

Keywords： maximum entropy FEM fully coupled multi-phase system porous media

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Transport in Nanoporous Media

Weiyao Zhu,Bin Pan,Zhen Chen,Wengang Bu,Qipeng Ma,Kai Liu,Ming Yue

Engineering 2024, Volume 32, Issue 1, Pages 139-152 doi: 10.1016/j.eng.2023.05.014

Abstract: Therefore herein, we systematically review experimental, theoretical and simulation works on single- and multi

Keywords： Transport in nanoporous media Multi-phase fluid dynamics Nonlinear flow mechanisms Nonlinear flow conservation

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Hydromechanical model for hydraulic fractures using XFEM

Bo HE

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1, Pages 240-249 doi: 10.1007/s11709-018-0490-6

Abstract: In this study, a hydromechanical model for fluid flow in fractured porous media is presented. We assume viscous fluids and the coupling equations are derived from the mass and momentum balance equations for saturated porous media. The fluid flow through discrete cracks will be modelled by the extended finite element method and an implicit time integration scheme. We also present a consistent linearization of the underlying non-linear discrete equations. They are solved by the Newton-Raphson iteration procedure in combination with a line search. Furthermore, the model is extended to includes crack propagation. Finally, examples are presented to demonstrate the versatility and efficiency of this two-scale hydromechanical model. The results suggest that the presence of the fracture in a deforming, porous media has great impact on the fluid flow and deformation patterns.

Keywords： multi-phase medium porous fracture multi-scale method

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Coupled solid-fluid FE-analysis of an embankment dam

Michael PERTL, Matthias HOFMANN, Guenter HOFSTETTER

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 1, Pages 53-62 doi: 10.1007/s11709-010-0084-4

Abstract: coupled solid-fluid FE-model for partially saturated soils, characterized by modeling the soil as a three-phase

Keywords： multi-phase model unsaturated soil model Barcelona Basic model (BBM) return mapping algorithm embankment

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Microfluidic production of liposomes through liquid–liquid phase separation in ternary droplets

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 6, Pages 1017-1022 doi: 10.1007/s11705-021-2118-y

Abstract: For demonstration, we used butyl acetate-water-ethanol ternary mixtures as inner phase and an aqueoussolution of surfactants as outer phase to make oil-in-water droplets, which can evolve into water-in-oil-in-waterdouble emulsion droplets by liquid–liquid phase separation of ternary mixtures.

Keywords： microfluidics liposomes ternary droplets phase separation

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Advances and perspectives in catalysts for liquid-phase oxidation of cyclohexane

Hui LI, Yuanbin SHE, Tao WANG

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 3, Pages 356-368 doi: 10.1007/s11705-012-0903-3

Abstract: The latest progress and developments in catalysts for the oxidation of cyclohexane are reviewed. Catalytic systems for the oxidation of cyclohexane including metal supported, metal oxides, molecular sieves, metal substituted polyoxometalates, photocatalysts, organocatalysts, Gif systems, metal-organic catalysts and metalloporphyrins are discussed with a particular emphasis on metalloporphyrin catalytic systems. The advantages and disadvantages of these methods are summarized and analyzed. Finally, the development trends in the oxidation technology of cyclohexane are examined.

Keywords： cyclohexane liquid-phase oxidation catalysis

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Simulation of heterogeneous two-phase media using random fields and level sets

George STEFANOU

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 2, Pages 114-120 doi: 10.1007/s11709-014-0267-5

Abstract: This paper provides a critical examination of existing random field models of heterogeneous two-phase

Keywords： microstructure random fields level sets shape recovery two-phase media

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Phase transition regulation and caloric effect

Frontiers in Energy 2023, Volume 17, Issue 4, Pages 463-477 doi: 10.1007/s11708-023-0860-1

Abstract: Solid state refrigeration based on caloric effect is regarded as a potential candidate for replacing vapor-compression refrigeration. Numerous methods have been proposed to optimize the refrigeration properties of caloric materials, of which single field tuning as a relatively simple way has been systemically studied. However, single field tuning with few tunable parameters usually obtains an excellent performance in one specific aspect at the cost of worsening the performance in other aspects, like attaining a large caloric effect with narrowing the transition temperature range and introducing hysteresis. Because of the shortcomings of the caloric effect driven by a single field, multifield tuning on multicaloric materials that have a coupling between different ferro-orders came into view. This review mainly focuses on recent studies that apply this method to improve the cooling performance of materials, consisting of enlarging caloric effects, reducing hysteresis losses, adjusting transition temperatures, and widening transition temperature spans, which indicate that further progress can be made in the application of this method. Furthermore, research on the sign of lattice and spin contributions to the magnetocaloric effect found new phonon evolution mechanisms, calling for more attention on multicaloric effects. Other progress including improving cyclability of FeRh alloys by introducing second phases and realizing a large reversible barocaloric effect by hybridizing carbon chains and inorganic groups is described in brief.

Keywords： phase transition regulation caloric effect solid state refrigeration

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Effect of graphene and its derivatives on thermo-mechanical properties of phase change materials and

Frontiers in Energy 2022, Volume 16, Issue 2, Pages 150-186 doi: 10.1007/s11708-021-0795-3

Abstract: Phase change materials (PCMs) play a leading role in overcoming the growing need of advanced thermal

Keywords： phase change materials (PCMs) graphene thermal conductivity characterization

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Distributed energy management for networked microgrids in a three-phase unbalanced distribution network

Frontiers in Energy 2023, Volume 17, Issue 3, Pages 446-446 doi: 10.1007/s11708-022-0851-7

Abstract: Owing to increased penetration of three-phase and single-phase microgrids, distributed energy resources(DERs), and responsive loads, the maintenance of a three-phase balance by distribution networks is aTo solve this issue, this study sought to propose distributed energy management based on a three-phaseVarious three-phase or single-phase microgrids, utility-owned DERs, and responsive loads were coordinatedConsidering a three-phase unbalanced distribution network, the price signals were determined per phase

Keywords： distributed optimization energy management networked microgrids three-phase distribution network

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Analysis of the radiation heat transfer process of phase change for a liquid droplet radiator in space

Jinying YIN, Linhua LIU

Frontiers in Energy 2011, Volume 5, Issue 2, Pages 166-173 doi: 10.1007/s11708-010-0105-y

Abstract: Radiation heat transfer in a two-dimensional bed of phase-change particle is modeled by solving the radiativeMultiple factors affect heat flux in the LDR, such as size distribution, flow velocity, phase change

Keywords： radiation heat transfer particle polydispersion liquid droplet radiator phase change

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Heat transfer of phase change materials (PCMs) in porous materials

C Y ZHAO, D ZHOU, Z G WU

Frontiers in Energy 2011, Volume 5, Issue 2, Pages 174-180 doi: 10.1007/s11708-011-0140-3

Abstract: In this paper, the feasibility of using metal foams to enhance the heat transfer capability of phaseHeat transfer in solid/liquid phase change of porous materials (metal foams and expanded graphite) at

Keywords： heat transfer thermal energy storage phase change materials natural convection porous media