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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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Binary Optics Used in High Power Laser Shaping

Jin Guopan,Tan Qiaofeng,Yan Yingbai,Wu Minxian

Strategic Study of CAE 2000, Volume 2, Issue 6, Pages 27-32

Abstract: On the basis of the analysis of GS and YG algorithms, three algorithms are developed for phase designof the Binary Optical Element (BOE), including Global/local united searching algorithm (GLUSA), hybridThe simulated results show that fine phase structure and good characters of the focused spot are realizedA continuous phase plate is manufactured with a rotating hollowed-out mask.

Keywords： beam shaping binary optics phase element optimization algorithm

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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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Acoustic analysis of lightweight auto-body based on finite element method and boundary element method

LIANG Xinhua, ZHU Ping, LIN Zhongqin, ZHANG Yan

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1, Pages 99-103 doi: 10.1007/s11465-007-0017-7

Abstract: of 1 150 Hz, the frequency response function (FRF) of the body structure is calculated by a finite elementThe pressure response of the interior acoustic domain is solved by a boundary element method (BEM).

Keywords： harshness automotive prototype structural optimization vibration efficient

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Thermal buckling behavior of laminated composite plates: a finite-element study

Houdayfa OUNIS,Abdelouahab TATI,Adel BENCHABANE

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 1, Pages 41-49 doi: 10.1007/s11465-014-0284-z

Abstract: A finite element of four nodes and 32 degrees of freedom (DOF), previously developed for the bendingBased upon the classical plate theory, the present finite element is a combination of a linear isoparametricmembrane element and a high precision rectangular Hermitian element.results with results obtained from the literature: 1) with element of the same order, 2) the first orderIt was found that the obtained results were very close to the reference results and the proposed element

Keywords： thermal buckling laminated composite plates anisotropy critical buckling temperature finite-element method high precision rectangular Hermitian element

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Special Column on Multiscale Stochastic Finite Element Method

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 2, Pages 105-106 doi: 10.1007/s11709-015-0297-7

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Comparison of indirect boundary element and finite element methods A case study: Shiraz-Esfahan railway

Amin MANOUCHEHRIAN, Mohammad Fatehi MARJI, Mohsen MOHEBBI

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 4, Pages 385-392 doi: 10.1007/s11709-012-0173-7

Abstract: Recently, various numerical methods such as finite element method (FEM), discrete element method (DEM), finite difference method (FDM) and boundary element method (BEM) have been used extremely in geosciencesThis paper suggests the implementation of the indirect boundary element method (IBEM) as a formulation

Keywords： indirect boundary element method finite element method displacement tunnel case study

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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

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A FEniCS implementation of the phase field method for quasi-static brittle fracture

HIRSHIKESH, Sundararajan NATARAJAN, Ratna Kumar ANNABATTULA

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2, Pages 380-396 doi: 10.1007/s11709-018-0471-9

Abstract: In the recent years, the phase field method for simulating fracture problems has received considerableis due to the salient features of the method: 1) it can be incorporated into any conventional finite elementThe present work discusses the implementation of the phase field method for brittle fracture within theopen-source finite element software, FEniCS.

Keywords： phase field method FEniCS brittle fracture crack propagation variational theory of fracture