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A time−space porosity computational model for concrete under sulfate attack

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0985-7

Abstract: This study proposes a mechanical–chemical model to simulate the spatiotemporal distribution of the porosityIn addition, the expansion strain at the macro-scale is obtained using a stress analysis model of compositeThe results demonstrate that the expansion strains calculated using the suggested model agree well withThe proposed model can forecast and assess the porosity of concrete covers and provide a credible approach

Keywords： expansion deformation     porosity     internal expansion stress     external sulfate attack     mechanical–chemicalcoupling model    

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Microdamage study of granite under thermomechanical coupling based on the particle flow code

Frontiers of Structural and Civil Engineering   Pages 1413-1427 doi: 10.1007/s11709-023-0953-2

Abstract: The thermomechanical coupling of rocks refers to the interaction between the mechanical and thermodynamicThe study of this coupling interaction is essential for understanding the mechanical and thermodynamicA series of numerical thermomechanical coupling tests are then conducted to calibrate the micro-parametersof the proposed model by considering the mechanical behavior of the rock under different thermomechanicalWith this improved model, the thermodynamic response and underlying cracking behavior of a deep-buried

Keywords： thermomechanical coupling effect     granite     improved linear parallel bond model     thermal property     particle    

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Effect of land-use management systems on coupled physical and mechanical, chemical and biological soil

Rainer HORN, Winfried E. H. BLUM

Frontiers of Agricultural Science and Engineering 2020, Volume 7, Issue 3,   Pages 243-245 doi: 10.15302/J-FASE-2020334

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Simulation of steel beam under ceiling jet based on a wind–fire–structure coupling model

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1,   Pages 78-98 doi: 10.1007/s11709-022-0936-8

Abstract: For localized fires, it is necessary to consider the thermal and mechanical responses of building elementsInstead of applying the concept of adiabatic surface temperature (AST) to achieve fluid–structure couplingFirst, to analyze the velocity and temperature distributions, the results of the numerical model andIn terms of mechanical response, the yield strength degradation in the highest-temperature region inThe mechanical response of the overall elements considering the incoming flows was essentially elastic

Keywords： CFD–FEM coupling     steel beam     wind     ceiling jet     numerical heat transfer    

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Modification of the activated sludge model for chemical dosage

Shuai MA,Siyu ZENG,Xin DONG,Jining CHEN,Gustaf OLSSON

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 4,   Pages 694-701 doi: 10.1007/s11783-014-0732-3

Abstract: Full-scale experiments have been carried out to adapt the activated sludge model ASM2d to include theCorresponding parameters in the ASM2d and the secondary settler models, included in the Benchmark Simulation Model

Keywords： chemical precipitation     benchmark simulation model     phosphorus removal     respiratory rate     sludge settling     activated sludge model    

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The Model of Water and Nitrogen Coupling in Winter Wheat Yield

Zhai Bingnian,Li Shengxiu

Strategic Study of CAE 2002, Volume 4, Issue 9,   Pages 69-74

Abstract: The results showed that the mathematical model established based on the result of experiments is significantBy analysing the mathematical model, the soil moisture, tillering and jointing stage were thought to

Keywords： winter wheat     nitrogen     soil moisture     water and nitrogen coupling     mathematical model    

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Coupling of the chemical niche and microbiome in the rhizosphere: implications from watermelon grafting

Yang SONG, Chen ZHU, Waseem RAZA, Dongsheng WANG, Qiwei HUANG, Shiwei GUO, Ning LING, Qirong SHEN

Frontiers of Agricultural Science and Engineering 2019, Volume 6, Issue 2,   Pages 206-206 doi: 10.15302/J-FASE-2018234

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Determination of mechanical parameters for elements in meso-mechanical models of concrete

Xianglin GU, Junyu JIA, Zhuolin WANG, Li HONG, Feng LIN

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 4,   Pages 391-401 doi: 10.1007/s11709-013-0225-7

Abstract: tension were calculated based on the discrete element method with the modified-rigid-body-spring concrete model, in which the mechanical parameters derived from macro-scale material tests were applied directly topredicted by the Carpinteri and Weibull size effects laws, a series of formulas to convert the macro-scale mechanical

Keywords： concrete     meso-mechanical model     discrete element method     size effect     mechanical parameter    

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Shear-flexural strength mechanical model for the design and assessment of reinforced concrete beams subjected

Antonio MARÍ,Antoni CLADERA,Jesús BAIRÁN,Eva OLLER,Carlos RIBAS

Frontiers of Structural and Civil Engineering 2014, Volume 8, Issue 4,   Pages 337-353 doi: 10.1007/s11709-014-0081-0

Abstract: A mechanical model recently developed for the shear strength of slender reinforced concrete beams withThe predictions of the model have been compared to those obtained by using the EC2, MC2010 and ACI 318

Keywords： shear strength     mechanical model     reinforced concrete     design     assessment     shear tests    

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Preparation of composite abrasives by electrostatic self assembly methodand its polishing properties in Cu chemicalmechanical polishing

Huang Yishen,Xu Xuefeng,Yao Chunyan,Hu Jiande and Peng Wei

Strategic Study of CAE 2012, Volume 14, Issue 10,   Pages 82-89

Abstract:

The absorption characteristics of cationic polyelectrolyte PDADMAC and anionic polyelectrolyte PSS on benzoguanamine formaldehyde (BGF) particles are investigated. The charging characteristics of BGF particles are changed and controlled using electrostatic self assembly method. A variety of PEi BGF/SiO2 composite abrasives are obtained. The as prepared samples are analyzed by Zeta potential analysis, transmission electron microscope (TEM) and thermogravimetric (TG) analysis. The composite abrasives slurries are prepared for copper polishing. The polishing results indicate that it is SiO2 abrasives, not only coated SiO2 abrasive on polymer particles but also free SiO2 abrasive in slurry, that offer the polishing action. The material removal rates of copper polishing are 264 nm/min, 348 nm/min and 476 nm/min using single SiO2 abrasive slurry, PE0 BGF/SiO2 mixed abrasives slurry and PE3 BGF/SiO2 composite abrasives slurry respectively. The surface roughness Ra of copper wafer (with 5 μm×5 μm district) is decreased from 0.166 μm to 3.7 nm, 2.6 nm and 1.5 nm, and the surface peak valley values Rpv are less than 20 nm, 14 nm and 10 nm using these kinds of slurries respectively.

Keywords： chemical mechanical polishing     polishing slurry     composite abrasives     polyelectrolyte     copper    

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Studying the stress-suction coupling in soils using an oedometer equipped with a high capacity tensiometer

Trung Tinh LE, Yu-Jun CUI, Juan Jorge MU?OZ, Pierre DELAGE, Anh Minh TANG, Xiang-Ling LI

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 2,   Pages 160-170 doi: 10.1007/s11709-011-0106-x

Abstract: In the context of research into deep nuclear waste disposal, various works have concerned the hydromechanical behavior of Boom clay, a stiff plastic clay extracted in the SCK-CEN Underground Research Laboratory near the Mol City (Belgium), at a depth of 223 m. Due to some amount of smectite minerals in the clay fraction, Boom clay exhibits swelling properties when hydrated under low stresses. To investigate some aspects of the hydromechanical behavior of Boom clay, oedometer compression tests were carried out on samples of Boom clay close to saturation and submitted to an initial suction. During oedometer compression, the changes in suction with increased vertical stress are monitored by means of a high capacity tensiometer installed at the bottom of the sample. Some aspects related to hydromechanical couplings are examined through the investigation of the changes in suction during oedometer compression, a somewhat delicate and poorly documented experimental approach. A comparison is also made with a completely different soil sample under suction, i.e. a statically compacted unsaturated low plasticity silt. Some technical difficulties typical of this new experimental approach are first described in detail so as to optimize the interpretation of the data obtained. The experiment allows the determination of the point at which suction is changed to positive pressure during compression. Below this point, the ratio between the vertical stress and the change in suction are determined. Above this point, the data show that positive pore pressures are dissipated in a common way. The suction/stress behavior during unloading is also described and discussed. Finally, an interpretation in terms of microstructure effects is provided for both samples. The experimental approach initiated here seems to provide interesting further application to better understand hydromechanical couplings in natural soils in relation with suction increase during stress release.

Keywords： Oedometer     tensiometer     swelling     physicochemical and mechanical effects     stress/suction coupling     soil plasticity    

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An operating state estimation model for integrated energy systems based on distributed solution

Dengji ZHOU, Shixi MA, Dawen HUANG, Huisheng ZHANG, Shilie WENG

Frontiers in Energy 2020, Volume 14, Issue 4,   Pages 801-816 doi: 10.1007/s11708-020-0687-y

Abstract: separate planning, separate design, independent operating mode, and the increasingly prominent nonlinear couplingIn this paper, the mathematical model of the electricity-gas interconnected integrated energy systemconsidering the nonlinearity between measurement equations and state variables, a performance simulation modelThen, the state consistency equations and constraints of the coupling nodes for multiple energy sub-systemsA simulation model of an electricity-gas interconnected integrated energy system verifies the efficiency

Keywords： integrated energy system     state estimation     electricity-gas coupling energy system     nonlinear coupling     distributed    

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Finite element modeling of thermo-active diaphragm walls

Yi RUI, Mei YIN

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3,   Pages 646-663 doi: 10.1007/s11709-020-0584-9

Abstract: series of detailed finite element analyses are carried out to capture the fully coupled thermo-hydro-mechanical

Keywords： thermo-active diaphragm wall     finite element analysis     thermo-hydro-mechanical coupling     ground source heat    

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Reduction kinetics of SrFeO/CaO∙MnO nanocomposite as effective oxygen carrier for chemical looping partial

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 12,   Pages 1726-1734 doi: 10.1007/s11705-022-2188-5

Abstract: Chemical looping reforming of methane is a novel and effective approach to convert methane to syngas,related to the partial oxidation is well fitted by the Avrami–Erofeyev equation with n = 3 (A3 modellaw for the partial oxidation includes a solid conversion term whose expression is given by the A3 modelrate law could well predict the reduction kinetics; thus, it may be used to design and/or analyze a chemical

Keywords： chemical looping reforming     SrFeO3−δ/CaO·MnO nanocomposite     reduction kinetics     Avrami–Erofeyevmodel     pressure-dependent term    

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Polysulfone and zirconia composite separators for alkaline water electrolysis

Li XU, Wei LI, Yan YOU, Shaoxing ZHANG, Yingchun ZHAO

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 2,   Pages 154-161 doi: 10.1007/s11705-013-1331-8

Abstract: The novel composite separators composed of polysulfone and zirconia were prepared by phase inversion precipitation technique. This technique allows pre-evaporation time and extraction temperature to be varied in order to obtain optimal performances of the separators. In order to evaluate practical applicability of those composite separators, a small-scale electrolysis experimental apparatus was used to investigate the changes of cell voltage, gas purity and separator stability. The results revealed a decreased cell voltage compared to the conventional asbestos separators, and the gas purity and separator stability met the requirements for industrial use.

Keywords： phase inversion     separator     alkaline water electrolysis     mechanical and chemical stability    

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Title Author Date Type Operation

A time−space porosity computational model for concrete under sulfate attack

Journal Article

Microdamage study of granite under thermomechanical coupling based on the particle flow code

Journal Article

Effect of land-use management systems on coupled physical and mechanical, chemical and biological soil

Rainer HORN, Winfried E. H. BLUM

Journal Article

Simulation of steel beam under ceiling jet based on a wind–fire–structure coupling model

Journal Article

Modification of the activated sludge model for chemical dosage

Shuai MA,Siyu ZENG,Xin DONG,Jining CHEN,Gustaf OLSSON

Journal Article

The Model of Water and Nitrogen Coupling in Winter Wheat Yield

Zhai Bingnian,Li Shengxiu

Journal Article

Coupling of the chemical niche and microbiome in the rhizosphere: implications from watermelon grafting

Yang SONG, Chen ZHU, Waseem RAZA, Dongsheng WANG, Qiwei HUANG, Shiwei GUO, Ning LING, Qirong SHEN

Journal Article

Determination of mechanical parameters for elements in meso-mechanical models of concrete

Xianglin GU, Junyu JIA, Zhuolin WANG, Li HONG, Feng LIN

Journal Article

Shear-flexural strength mechanical model for the design and assessment of reinforced concrete beams subjected

Antonio MARÍ,Antoni CLADERA,Jesús BAIRÁN,Eva OLLER,Carlos RIBAS

Journal Article

Preparation of composite abrasives by electrostatic self assembly methodand its polishing properties in Cu chemicalmechanical polishing

Huang Yishen,Xu Xuefeng,Yao Chunyan,Hu Jiande and Peng Wei

Journal Article

Studying the stress-suction coupling in soils using an oedometer equipped with a high capacity tensiometer

Trung Tinh LE, Yu-Jun CUI, Juan Jorge MU?OZ, Pierre DELAGE, Anh Minh TANG, Xiang-Ling LI

Journal Article

An operating state estimation model for integrated energy systems based on distributed solution

Dengji ZHOU, Shixi MA, Dawen HUANG, Huisheng ZHANG, Shilie WENG

Journal Article

Finite element modeling of thermo-active diaphragm walls

Yi RUI, Mei YIN

Journal Article

Reduction kinetics of SrFeO/CaO∙MnO nanocomposite as effective oxygen carrier for chemical looping partial

Journal Article

Polysulfone and zirconia composite separators for alkaline water electrolysis

Li XU, Wei LI, Yan YOU, Shaoxing ZHANG, Yingchun ZHAO

Journal Article