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Comparison of the performance of traditional advection-dispersion equation and mobile-immobile model

Haizhu HU,Xiaomin MAO

Frontiers of Agricultural Science and Engineering 2016, Volume 3, Issue 3,   Pages 241-248 doi: 10.15302/J-FASE-2016108

Abstract: The traditional advection-dispersion equation (ADE) and the mobile-immobile model (MIM) are widely useddegradable solutes through a 1 m heterogeneous soil column under steady flow condition was simulated by ADEsimulated by MIM are less sensitive to the retardation factor compared with the results simulated by ADEThe breakthrough curves of degradable solute obtained by MIM and ADE nearly overlap with a high degradationshould be carefully considered when MIM is applied to simulate the degradable solute transport and/or ADE

Keywords： solute transport     advection dispersion equation (ADE)     mobile-immobile model (MIM)     conservative solute    

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Analytical solutions of three-dimensional contaminant transport in uniform flow field in porous media: A library

Hongtao WANG, Huayong WU

Frontiers of Environmental Science & Engineering 2009, Volume 3, Issue 1,   Pages 112-128 doi: 10.1007/s11783-008-0067-z

Abstract: The purpose of this study is to present a library of analytical solutions for the three-dimensional contaminant transport in uniform flow field in porous media with the first-order decay, linear sorption, and zero-order production. The library is constructed using Green's function method (GFM) in combination with available solutions. The library covers a wide range of solutions for various conditions. The aquifer can be vertically finite, semi-infinitive or infinitive, and laterally semi-infinitive or infinitive. The geometry of the sources can be of point, line, plane or volumetric body; and the source release can be continuous, instantaneous, or by following a given function over time. Dimensionless forms of the solutions are also proposed. A computer code FlowCAS is developed to calculate the solutions. Calculated results demonstrate the correctness of the presented solutions. The library is widely applicable to solve contaminant transport problems of one- or multiple- dimensions in uniform flow fields.

Keywords： solution library     contaminant transport     analytical solution     dispersion and advection     porous media     type    

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Heating energy savings potential from retrofitting old apartments with an advanced double-skin façade

Yeo Beom YOON, Byeongmo SEO, Brian Baewon KOH, Soolyeon CHO

Frontiers in Energy 2020, Volume 14, Issue 2,   Pages 224-240 doi: 10.1007/s11708-020-0801-1

Abstract: This paper proposes an advanced double-skin façade (DSF) system to replace existing balcony windows in

Keywords： double-skin façade     retrofitting     high-rise apartment     heating energy     building simulation    

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Modeling of Ce(IV) transport through a dispersion flat combined liquid membrane with carrier P507

Liang PEI,Liming WANG,Zhanying MA

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 4,   Pages 503-509 doi: 10.1007/s11783-013-0540-1

Abstract: A mathematical model for the transport of Ce(IV) from hydrochloric acid solutions through dispersion

Keywords： Dispersion flat combined liquid membrane (DFCLM)     dispersion phase     feed phase     2-ethyl hexyl phosphonic    

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Development of oxide dispersion strengthened ferritic steels with and without aluminum

Jae Hoon LEE

Frontiers in Energy 2012, Volume 6, Issue 1,   Pages 29-34 doi: 10.1007/s11708-012-0178-x

Abstract: The dispersed oxide particles were identified to be titania+ yttria for Al-free oxide dispersion strengthened

Keywords： oxide dispersion strengthened (ODS) steel     milling     extrusion     aluminum     yttria    

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Structural performance of a façade precast concrete sandwich panel enabled by a bar-type basalt fiber-reinforced

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1,   Pages 122-137 doi: 10.1007/s11709-022-0894-1

Abstract: After the test on the individual performance of the connector, five façade PCSP specimens with the bar-typeconsiderably influenced the out-of-plane flexural performance and composite action of the investigated façade

Keywords： precast concrete sandwich panel     basalt fiber reinforced polymer     pull-out performance     shear performance     out-of-plane flexural performance    

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TiO@palygorskite composite for the efficient remediation of oil spills via a dispersion-photodegradation

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 4, doi: 10.1007/s11783-020-1365-3

Abstract:

• A novel and multi-functional clay-based oil spill remediation system was constructed.

Keywords： Palygorskite     TiO2     Pickering emulsion     Oil spill     Dispersion     Photodegradation    

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Fabrication of bimetallic Cu–Zn adsorbents with high dispersion by using confined space for gas adsorptive

Frontiers of Chemical Science and Engineering   Pages 1623-1631 doi: 10.1007/s11705-022-2202-y

Abstract: The number of active components and their dispersion degree are two key factors affecting the performancein the AS and the strong interactions caused by the abundant hydroxyl groups are responsible for the dispersion

Keywords： bimetallic adsorbents     confined space     mesoporous silica     propene/propane separation    

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AMMONIA DISPERSION FROM MULTI-FLOOR VERSUS STANDARD SINGLE-FLOOR PIG PRODUCTION FACILITIES BASED ON COMPUTATIONAL

Frontiers of Agricultural Science and Engineering 2023, Volume 10, Issue 3,   Pages 374-389 doi: 10.15302/J-FASE-2023501

Abstract:

● NH3 dispersion from a multi-floor pig building was compared

Keywords： pig building     computational fluid dynamics     ammonia     dispersion    

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Composition, dispersion, and health risks of bioaerosols in wastewater treatment plants: A review

Yunping Han, Lin Li, Ying Wang, Jiawei Ma, Pengyu Li, Chao Han, Junxin Liu

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 3, doi: 10.1007/s11783-020-1330-1

Abstract: Abstract • Bioaerosols are produced in the process of wastewater biological treatment. • The concentration of bioaerosol indoor is higher than outdoor. • Bioaerosols contain large amounts of potentially pathogenic biomass and chemicals. • Inhalation is the main route of exposure of bioaerosol. • Both the workers and the surrounding residents will be affected by the bioaerosol. Bioaerosols are defined as airborne particles (0.05–100 mm in size) of biological origin. They are considered potentially harmful to human health as they can contain pathogens such as bacteria, fungi, and viruses. This review summarizes the most recent research on the health risks of bioaerosols emitted from wastewater treatment plants (WWTPs) in order to improve the control of such bioaerosols. The concentration and size distribution of WWTP bioaerosols; their major emission sources, composition, and health risks; and considerations for future research are discussed. The major themes and findings in the literature are as follows: the major emission sources of WWTP bioaerosols include screen rooms, sludge-dewatering rooms, and aeration tanks; the bioaerosol concentrations in screen and sludge-dewatering rooms are higher than those outdoors. WWTP bioaerosols contain a variety of potentially pathogenic bacteria, fungi, antibiotic resistance genes, viruses, endotoxins, and toxic metal(loid)s. These potentially pathogenic substances spread with the bioaerosols, thereby posing health risks to workers and residents in and around the WWTP. Inhalation has been identified as the main exposure route, and children are at a higher risk of this than adults. Future studies should identify emerging contaminants, establish health risk assessments, and develop prevention and control systems.

Keywords： Wastewater treatment plant     Bioaerosols     Pathogen     Dispersion     Risk assessment    

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Dispersion of a novel phenolic rigid organic filler in isotactic polypropylene matrix by solution-mixing

Dongming QI, Xiaoli ZHAO, Zhijie CHEN, Peng HUANG, Jun CAO

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 4,   Pages 395-402 doi: 10.1007/s11705-012-1269-2

Abstract: Influences of MAPP and mixing methods on the filler dispersion were studied using polaried optical microscopeprepared by incorporating MAPP to reduce the interfacial tension and surface free energy between the dispersion

Keywords： dispersion     rigid organic filler     isotactic polypropylene     mixing    

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On the monolayer dispersion behavior of Co3O4 on HZSM-5 support: designing applicable

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 11,   Pages 1741-1754 doi: 10.1007/s11705-023-2332-x

Abstract: Based on monolayer dispersion theory, Co3O4/ZSM-5 catalysts with different loadingsCo3O4 can spontaneously disperse on HZSM-5 support with a monolayer dispersionBelow the monolayer dispersion threshold, Co3O4 is finely dispersed as sub-monolayersthe reaction performance. 4% Co3O4/ZSM-5, the catalyst close to the monolayer dispersion

Keywords： Co3O4/ZSM-5     NOx-SCR by NH3     monolayer dispersion    

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Enhanced CuCl dispersion by regulating acidity of MCM-41 for catalytic oxycarbonylation of ethanol to

Pengzhen CHEN, Shouying HUANG, Jijie ZHANG, Shengping WANG, Xinbin MA

Frontiers of Chemical Science and Engineering 2015, Volume 9, Issue 2,   Pages 224-231 doi: 10.1007/s11705-014-1447-5

Abstract: The incorporation of Al components resulted in the high dispersion of Cu species and the increase of

Keywords： MCM-41     acidity     oxidative carbonylation     diethyl carbonate    

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Optimal design of extractive dividing-wall column using an efficient equation-oriented approach

Yingjie Ma, Nan Zhang, Jie Li, Cuiwen Cao

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 1,   Pages 72-89 doi: 10.1007/s11705-020-1977-y

Abstract: The extractive dividing-wall column (EDWC) is one of the most efficient technologies for separation of azeotropic or close boiling-point mixtures, but its design is fairly challenging. In this paper we extend the hybrid feasible path optimisation algorithm (Ma Y, McLaughlan M, Zhang N, Li J. Computers & Chemical Engineering, 2020, 143: 107058) for such optimal design. The tolerances-relaxation integration method is refined to allow for long enough integration time that can ensure the solution of the pseudo-transient continuation simulation close to the steady state before the required tolerance is used. To ensure the gradient and Jacobian information available for optimisation, we allow a relaxed tolerance for the simulation in the sensitivity analysis mode when the simulation diverges under small tolerance. In addition, valid lower bounds on purity of the recycled entrainer and the vapour flow rate in column sections are imposed to improve computational efficiency. The computational results demonstrate that the extended hybrid algorithm can achieve better design of the EDWC compared to those in literature. The energy consumption can be reduced by more than 20% compared with existing literature report. In addition, the optimal design of the heat pump assisted EDWC is achieved using the improved hybrid algorithm for the first time.

Keywords： design     extractive dividing-wall column     equation-oriented optimisation     pseudo-transient continuation model    

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Performance enhancement of partially shaded solar PV array using novel shade dispersion technique

Namani RAKESH,T. Venkata MADHAVARAM

Frontiers in Energy 2016, Volume 10, Issue 2,   Pages 227-239 doi: 10.1007/s11708-016-0405-y

Abstract: Solar photo voltaic array (SPVA) generates a smaller amount of power than the standard rating of the panel due to the partial shading effect. Since the modules of the arrays receive different solar irradiations, the P-V characteristics of photovoltaic (PV) arrays contain multiple peaks or local peaks. This paper presents an innovative method (magic square) in order to increase the generated power by configuring the modules of a shaded photovoltaic array. In this approach, the physical location of the modules in the total cross tied (TCT) connected in the solar PV array is rearranged based on the magic square arrangement pattern. This connection is done without altering any electrical configurations of the modules in the PV array. This method can distribute the shading effect over the entire PV array, without concentrating on any row of modules and can achieve global peaks. For different types of shading patterns, the output power of the solar PV array with the proposed magic square configuration is compared with the traditional configurations and the performance is calculated. This paper presents a new reconfiguration technique for solar PV arrays, which increases the PV power under different shading conditions. The proposed technique facilitates the distribution of the effect of shading over the entire array, thereby, reducing the mismatch losses caused by partial shading. The theoretical calculations are tested through simulations in Matlab/Simulink to validate the results. A comparison of power loss for different types of topologies under different types of shading patterns for a 4 × 4 array is also explained.

Keywords： photovoltaic cells     mismatch loss     shading patterns     partial shading     magic square     power enhancement     global peaks and total cross tied (TCT)    

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Title Author Date Type Operation

Comparison of the performance of traditional advection-dispersion equation and mobile-immobile model

Haizhu HU,Xiaomin MAO

Journal Article

Analytical solutions of three-dimensional contaminant transport in uniform flow field in porous media: A library

Hongtao WANG, Huayong WU

Journal Article

Heating energy savings potential from retrofitting old apartments with an advanced double-skin façade

Yeo Beom YOON, Byeongmo SEO, Brian Baewon KOH, Soolyeon CHO

Journal Article

Modeling of Ce(IV) transport through a dispersion flat combined liquid membrane with carrier P507

Liang PEI,Liming WANG,Zhanying MA

Journal Article

Development of oxide dispersion strengthened ferritic steels with and without aluminum

Jae Hoon LEE

Journal Article

Structural performance of a façade precast concrete sandwich panel enabled by a bar-type basalt fiber-reinforced

Journal Article

TiO@palygorskite composite for the efficient remediation of oil spills via a dispersion-photodegradation

Journal Article

Fabrication of bimetallic Cu–Zn adsorbents with high dispersion by using confined space for gas adsorptive

Journal Article

AMMONIA DISPERSION FROM MULTI-FLOOR VERSUS STANDARD SINGLE-FLOOR PIG PRODUCTION FACILITIES BASED ON COMPUTATIONAL

Journal Article

Composition, dispersion, and health risks of bioaerosols in wastewater treatment plants: A review

Yunping Han, Lin Li, Ying Wang, Jiawei Ma, Pengyu Li, Chao Han, Junxin Liu

Journal Article

Dispersion of a novel phenolic rigid organic filler in isotactic polypropylene matrix by solution-mixing

Dongming QI, Xiaoli ZHAO, Zhijie CHEN, Peng HUANG, Jun CAO

Journal Article

On the monolayer dispersion behavior of Co3O4 on HZSM-5 support: designing applicable

Journal Article

Enhanced CuCl dispersion by regulating acidity of MCM-41 for catalytic oxycarbonylation of ethanol to

Pengzhen CHEN, Shouying HUANG, Jijie ZHANG, Shengping WANG, Xinbin MA

Journal Article

Optimal design of extractive dividing-wall column using an efficient equation-oriented approach

Yingjie Ma, Nan Zhang, Jie Li, Cuiwen Cao

Journal Article

Performance enhancement of partially shaded solar PV array using novel shade dispersion technique

Namani RAKESH,T. Venkata MADHAVARAM

Journal Article