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Journal articles on the topic 'VFCW modelling'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Petitjean, A., A. Wanko, N. Forquet, R. Mosé, F. Lawniczak, and Antoine Sadowski. "Diphasic transfer of oxygen in vertical flow filters: a modelling approach." Water Science and Technology 64, no. 1 (2011): 109–16. http://dx.doi.org/10.2166/wst.2011.618.

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Oxygen renewal, as a prominent phenomenon for aerobic bacterial activity, deeply impacts vertical flow constructed wetland (VFCW) treatment efficiency. The authors introduce a multiphase model able to simulate oxygen transfer in VFCWs. It is based on a two-phase flow module, and a transport module. The transport module is able to deal with convection/diffusion phenomena, inter-phase (air–water) mass exchange, and first-order kinetics. The first results displayed for the air phase allow us to draw the following ideas on the design of vertical filters. The ponding phenomenon is more efficient fo

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2

Alejandro, Rincón, Yaneth Florez Gloria, and E. Hoyos Velasco Fredy. "Unsteady state series CSTR modeling of removal of ammonia nitrogen from domestic wastewater treated in a vertical flow constructed wetland." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 1 (2020): 868–80. https://doi.org/10.11591/ijece.v10i1.pp868-880.

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This work shows simulation results for subsurface vertical flow constructed wetland (VFCW) using a series CSTR model. The VFCW considered received the outflow from a domestic wastewater treatment plant. In addition, it was planted with Cyperus sp. and filter media was unsaturated. The model was based on an unsteady state mass balance for ammonia, nitrites, and nitrates, using one to three series CSTRs. Nitrogen transformation mechanisms considered were ammonification, nitrification, plant uptake and denitrification. The following effects were evaluated: the number of reacting CSTRs from one to

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3

Forquet, N., A. Wanko, P. Molle, R. Mosé, and A. G. Sadowski. "Two-phase flow modelling for oxygen renewal estimation in vertical flow filter: luxury or necessity?" Water Science and Technology 59, no. 12 (2009): 2311–19. http://dx.doi.org/10.2166/wst.2009.311.

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Scientists and practitioners exhibit an increasing interest on effluent transfer and degradation modelling in Vertical Flow Sand Filters (VFSF) and Vertical Flow Constructed Wetland (VFCW). Modelling software used to this purpose is mainly monophasic: in the unsaturated zone, only water flow is taken into account and air phase influence is assumed to be negligible. In hydrology, many studies have point out the limitations of this assumption in order to quantify air phase movement but little has been done in the modelling of vertical flow filter. Despite its complexity, two-phase flow modelling

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4

Vasyliv, K. M. "Method of dynamic parameters for mathematical modelling of switching processes of valves closing of semiconductor converters." Electrical Engineering & Electromechanics, no. 3 (May 30, 2022): 28–38. http://dx.doi.org/10.20998/2074-272x.2022.3.05.

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A method has been developed for mathematical modeling of valve frequency converters (VFC) based on an analysis of the nature of the occurrence and patterns of the flow of inverse current of valves when they are locked using the dynamic parameters of valves, which are series-connected inductance and active resistance, changing in accordance with the pattern of concentration dynamics charges in semiconductor structures (bases, emitters and p-n junctions. Taking into account the presence of the inverse current of semiconductor valves significantly increases the level of adequacy of mathematical m

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5

K., M. Vasyliv. "Method of dynamic parameters for mathematical modelling of switching processes of valves closing of semiconductor converters." Electrical Engineering & Electromechanics, no. 3 (May 30, 2022): 28–38. https://doi.org/10.20998/2074-272X.2022.3.05.

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<em>A method has been developed for mathematical modeling of valve frequency converters (VFC) based on an analysis of the nature of the occurrence and patterns of the flow of inverse current of valves when they are locked using the dynamic parameters of valves, which are series-connected inductance and active resistance, changing in accordance with the pattern of concentration dynamics charges in semiconductor structures (bases, emitters and p-n junctions. Taking into account the presence of the inverse current of semiconductor valves significantly increases the level of adequacy of mathematic

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6

Anderson, Gillian H., Paul J. Jenkins, David A. McDonald, et al. "Cost comparison of orthopaedic fracture pathways using discrete event simulation in a Glasgow hospital." BMJ Open 7, no. 9 (2017): e014509. http://dx.doi.org/10.1136/bmjopen-2016-014509.

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ObjectiveHealthcare faces the continual challenge of improving outcome while aiming to reduce cost. The aim of this study was to determine the micro cost differences of the Glasgow non-operative trauma virtual pathway in comparison to a traditional pathway.DesignDiscrete event simulation was used to model and analyse cost and resource utilisation with an activity-based costing approach. Data for a full comparison before the process change was unavailable so we used a modelling approach, comparing a virtual fracture clinic (VFC) with a simulated traditional fracture clinic (TFC).SettingThe orth

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7

Schlotfeldt, Paul, Jacob Nikl, and Jonathon Sutton. "Calculating Bias-Free Volumetric Fracture Counts (VFCs) in Underground Works and Their Use in Estimating Rock Mass Strength and Deformability Parameters." Applied Sciences 12, no. 18 (2022): 9025. http://dx.doi.org/10.3390/app12189025.

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This paper initially provides a practical example on how to estimate a bias-free volumetric fracture count (VFC—fractures/m3) in a tunnel and incorporate it into a new and unified volumetric-based Geological Strength Index (V-GSI) chart. The quantified V-GSI chart and the methods shown in the practical example were used extensively as tools to assess rock mass conditions and assist in support determinations on the WestConnex M8 Motorway tunnel project in Sydney, Australia. The reliability of the strength and deformability estimates obtained using the V-GSI ratings while tunneling within the Ha

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8

Schlotfeldt, Paul, Jose (Joe) Carvalho, and Brad Panton. "Scale Considerations and the Quantification of the Degree of Fracturing for Geological Strength Index (GSI) Assessments." Applied Sciences 15, no. 15 (2025): 8219. https://doi.org/10.3390/app15158219.

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This paper provides research that shows that the scale and quantification of the degree of fracturing in a rock mass should and can be considered when estimating geological strength index (GSI) ratings for rock mass strength and deformability estimates. In support of this notion, a brief review is provided to demonstrate why it is imperative that scale is considered when using GSI in engineering design. The impact of scale and scale effects on the engineering response of a rock mass typically requires a definition of fracture intensity relative to the volume or size of rock mass under consider

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9

Boora, Shakuntla, S. K. Agarwal, and K. S. Sandhu. "Traditional PI and FPIL Based VFCU for an Isolated Induction Generator (IIG)." International Journal of Intelligent Systems and Applications 9, no. 12 (2017): 10–19. http://dx.doi.org/10.5815/ijisa.2017.12.02.

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10

Shobairi, Seyed Omidreza, and Mingyang Li. "Dynamic Modelling of VFC from 2000 to 2010 Using NDVI and DMSP/OLS Time Series: A Study in Guangdong Province, China." Journal of Geographic Information System 08, no. 02 (2016): 205–23. http://dx.doi.org/10.4236/jgis.2016.82019.

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11

Ju, Xueli, Linjian Wu, Mingwei Liu, Han Jiang, and Wenxiao Zhang. "Modelling of Chloride Concentration Profiles in Concrete by the Consideration of Concrete Material Factors under Marine Tidal Environment." Journal of Marine Science and Engineering 10, no. 7 (2022): 917. http://dx.doi.org/10.3390/jmse10070917.

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The corrosion of reinforcement induced by chloride ions is one of the most significant causes of durability deterioration for reinforced concrete (RC) buildings. The concrete material factors, including the water-to-cement ratio (w/c) of concrete, as well as the content, shape, particle grading, and random distribution of coarse aggregate embedded in mortar, have a marked effect on chloride transport performance within concrete. However, comprehensive consideration for the effects of both w/c and coarse aggregate performances on chloride diffusion characteristics in concrete is scarce, especia

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12

Luo, Xiang, Liang Liang, Zhixiao Liu, et al. "Habitat Suitability Evaluation of the Chinese Horseshoe Bat (R. sinicus) in the Wuling Mountain Area Based on MAXENT Modelling." Polish Journal of Environmental Studies 29, no. 2 (2020): 1263–73. https://doi.org/10.5281/zenodo.13447891.

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(Uploaded by Plazi for the Bat Literature Project) The modelling of habitat suitability and the prediction of the spatial distribution of species are important for the conservation of endangered species. In this paper, the evaluation of habitat suitability of the Chinese horseshoe bat (Rhinolophus sinicus) in the Wuling Mountains was studied. The global positioning system (GPS), remote sensing (RS) and geographic information system (GIS) were used to obtain ground survey data and analyse the habitat factors driving the distribution of R. sinicus. The binary logistic regression model and the Ma

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13

Luo, Xiang, Liang Liang, Zhixiao Liu, et al. "Habitat Suitability Evaluation of the Chinese Horseshoe Bat (R. sinicus) in the Wuling Mountain Area Based on MAXENT Modelling." Polish Journal of Environmental Studies 29, no. 2 (2020): 1263–73. https://doi.org/10.5281/zenodo.13447891.

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Abstract:

(Uploaded by Plazi for the Bat Literature Project) The modelling of habitat suitability and the prediction of the spatial distribution of species are important for the conservation of endangered species. In this paper, the evaluation of habitat suitability of the Chinese horseshoe bat (Rhinolophus sinicus) in the Wuling Mountains was studied. The global positioning system (GPS), remote sensing (RS) and geographic information system (GIS) were used to obtain ground survey data and analyse the habitat factors driving the distribution of R. sinicus. The binary logistic regression model and the Ma

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14

Luo, Xiang, Liang Liang, Zhixiao Liu, et al. "Habitat Suitability Evaluation of the Chinese Horseshoe Bat (R. sinicus) in the Wuling Mountain Area Based on MAXENT Modelling." Polish Journal of Environmental Studies 29, no. 2 (2020): 1263–73. https://doi.org/10.5281/zenodo.13447891.

Full text

Abstract:

(Uploaded by Plazi for the Bat Literature Project) The modelling of habitat suitability and the prediction of the spatial distribution of species are important for the conservation of endangered species. In this paper, the evaluation of habitat suitability of the Chinese horseshoe bat (Rhinolophus sinicus) in the Wuling Mountains was studied. The global positioning system (GPS), remote sensing (RS) and geographic information system (GIS) were used to obtain ground survey data and analyse the habitat factors driving the distribution of R. sinicus. The binary logistic regression model and the Ma

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15

Luo, Xiang, Liang Liang, Zhixiao Liu, et al. "Habitat Suitability Evaluation of the Chinese Horseshoe Bat (R. sinicus) in the Wuling Mountain Area Based on MAXENT Modelling." Polish Journal of Environmental Studies 29, no. 2 (2020): 1263–73. https://doi.org/10.5281/zenodo.13447891.

Full text

Abstract:

(Uploaded by Plazi for the Bat Literature Project) The modelling of habitat suitability and the prediction of the spatial distribution of species are important for the conservation of endangered species. In this paper, the evaluation of habitat suitability of the Chinese horseshoe bat (Rhinolophus sinicus) in the Wuling Mountains was studied. The global positioning system (GPS), remote sensing (RS) and geographic information system (GIS) were used to obtain ground survey data and analyse the habitat factors driving the distribution of R. sinicus. The binary logistic regression model and the Ma

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16

Luo, Xiang, Liang Liang, Zhixiao Liu, et al. "Habitat Suitability Evaluation of the Chinese Horseshoe Bat (R. sinicus) in the Wuling Mountain Area Based on MAXENT Modelling." Polish Journal of Environmental Studies 29, no. 2 (2020): 1263–73. https://doi.org/10.5281/zenodo.13447891.

Full text

Abstract:

(Uploaded by Plazi for the Bat Literature Project) The modelling of habitat suitability and the prediction of the spatial distribution of species are important for the conservation of endangered species. In this paper, the evaluation of habitat suitability of the Chinese horseshoe bat (Rhinolophus sinicus) in the Wuling Mountains was studied. The global positioning system (GPS), remote sensing (RS) and geographic information system (GIS) were used to obtain ground survey data and analyse the habitat factors driving the distribution of R. sinicus. The binary logistic regression model and the Ma

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17

Brych, Bogdan. "INTERNATIONAL EXPERIENCE OF FUNCTIONING OF THE ENERGY SERVICE MARKET." Economic discourse, no. 4 (December 2019): 94–101. http://dx.doi.org/10.36742/2410-0919-2019-4-10.

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Introduction. The market for energy services has virtually taken shape. However, today, due to the difficult economic situation, it, like other directions of the national economy, is experiencing an unfavourable period. The issue of studying and implementing international experience in Ukrainian realities is an urgent one, which will make it possible to unlock the potential of energy service development in Ukraine. Methods. The study used materials of professional publications, normative and legal acts on the formation of energy services market. The systematic approach, analytical method, meth

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18

Sofi, Muhammad Hafizuddin, Noor Hafiza Harun, Anis Haryati Mansor, Zaki Yamani Zakaria, and Mazura Jusoh. "Progressive Freeze Concentration Performance Prediction based on Polynomial Curve Model for Star Fruit Juice Concentration." Malaysian Journal of Fundamental and Applied Sciences 18, no. 2 (2022): 245–56. http://dx.doi.org/10.11113/mjfas.v18n2.2386.

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Progressive freeze concentration (PFC) is a simpler freeze concentration process of removing water content in fruit juice through ice crystal formation in order to concentrate a solution. Vertical finned crystallizer (VFC) was used in the PFC system as the ice crystallizer in this study. A mathematical model is highly needed to be developed so that theories can be validated and to understand the system developed better with minimal risk and cost. Mathematical modelling is also essential to analyze the performance of the system. In this work, the use of mathematical model was explored based on

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