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Two-dimensional finite element model to study the effect of water flux on the nitrate dynamics in the rhizosphere of a maize root

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International Journal of Biomathematics 2017年第4期10卷 333-351页

作者： Ratnamala Badge Neeru Adlakha Department of Mathematics Maulana Azad National Institute of Technology Bhopal Madhya Pradesh 462003 India Department of MathematicsSardar Vallabhai National Institute of Technology Surat Gujarat India

The growth of plants and the quality and quantity of crop production depend on the uptake dynamics of water and mineral salts by the roots from the rhizosphere. This water and nutrient dynamics in the rhizosphere is still not well understood. In view of above a mathematical model is proposed to study the effect of water flux on the nitrate dynamics in the rhizosphere of a single maize root. The model incorporates the important mechanisms like diffusion and mass flow of solutes in the rhizosphere. The parameters like soil porosity, soil buffer power, radius of the root have incorporated in the model. Appropriate boundary and initial conditions have been framed based on the physical conditions of the problem. Coaxial circular sector elements have been employed to discretize the circular cross-section of the root. Galerkin finite element method has been employed to obtain the solution. The numerical results have been computed and used to study the effect of water flux on nitrate dynamics at the surface of the root and in the rhizosphere. The change percentage in nitrate concentration at the surface of the root in the rhizosphere of maize root due to change in water flux 1 0 − 7 – 1 0 − 6 cm s − 1 , 1 0 − 6 – 1 0 − 5 cm s − 1 and 1 0 − 7 – 1 0 − 5 cm s − 1 is observed to be 0.28–1.21%, 2.91–13.73% and 3.20–15.11% in μ mol cm − 3 respectively which is quite significant.

关键词： water flux nitrate finite element method

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Artificial Neural Network Model for Predicting of MF Membrane water flux

Artificial Neural Network Model for Predicting of MF Membran...

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The 12th Asian Pacific Confederation of Chemical Engineering Congress

作者： Ming Tan Gaohong He~* Yuanfa Liu Xudong Liu Wei Zhao State Key Laboratory of Fine Chemicals R&D Center of Membrane Science and Technology Dalian University of Technology 158 Zhongshan Road Dalian PC 116012 China

＜正＞water flux of membrane,one of the most important parameters of membrane performance,is closely related to membrane *** electronic microscope（SEM）image observa- tion is an effective and widely used method to ch... 详细信息

关键词： moment invariant neural network SEM membrane water flux

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A Computational Model of water Migration flux in Freezing Soil in a Closed System

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Journal of Shanghai University(English Edition) 2005年第2期9卷 124-126页

作者：裘春晗 School of Statistics and Calculation Zhejiang Gongshang University Hangzhou 31 0035 P.R. China

A computational model of water migration flux of fine porous soil in frost heave was investigated in a closed system. The model was established with the heat-m ass conservation law and from some previous experimental results. Through defini ng an auxiliary function an empirical function in the water migration flux, whic h is difficult to get, was replaced. The data needed are about the water conte nt along the soil column after test with enough long time. We adopt the test dat a of sample soil columns in [1] to verify the model. The result shows it can reflect the real situation on the whole.

关键词： water flux frost heave mathematical model.

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Preparation of reverse osmosis membrane with high permselectivity and anti-biofouling properties for desalination

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Frontiers of Environmental Science & Engineering 2022年第7期16卷 73-86页

作者： Xinxia Tian Hui Yu Jun Yang Xiaotai Zhang Man Zhao Yang Yang Wei Sun Yangyang Wei Yin Zhang Jian Wang Zhun Ma The Institute of Seawater Desalination and Multipurpose Utilization MNR(Tianjin)Tianjin300192China Tianjin Huanke Environment Consulting CO. LTDTianjin300191China College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao266590China

High performance is essential for the polyamide(PA)reverse osmosis(RO)membranes during the desalination ***,RO membranes with high permselectivity and anti-biofouling properties were fabricated by nanoparticles incorporation and anti-biofouling ***(HT)incorporation was performed with a dual role,enhancing water flux and acting as grafting *** HT incorporation increased the water flux without sacrificing the salt rejection,compensating for the loss caused by the following grafting *** exposed surface of HT acted as grafting sites for anti-biofouling agent dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride(DMOTPAC).The combination of HT incorporation and DMOTPAC grafting endowed RO membranes with high permselectivity and anti-biofouling *** water flux of the modified membrane PA-HT-0.06 was 49.8 L/m^(2)·h,which was 16.4%higher than that of the pristine *** salt rejection of PA-HT-0.06 was 99.1%,which was comparable to that of the pristine *** to the fouling of negatively charged lysozyme,the modified membrane’s water flux recovery was superior to that of the pristine membrane(e.g.86.8%of PA-HT-0.06 compared to 78.2%of PA-pristine).The sterilization rates of PA-HT-0.06 for *** and *** were 97.3%and 98.7%,much higher than those of the pristine membrane(24.0%for *** and 26.7%for ***).

关键词： Anti-biofouling grafting Nanoparticle incorporation Sterilization rates water flux water flux recovery

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Predicting of Membranes water fluxes using Artificial Neural Network

Predicting of Membranes Water Fluxes using Artificial Neural...

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The 12th Asian Pacific Confederation of Chemical Engineering Congress

＜正＞water flux of membrane,one of the most important parameters of membrane performance, usually measured by flux experiment,is closely related to membrane microstructure. Artificial neural network were successfully used to predict rejection and flux of solutes from concentration of solutes,solution viscosity and operating parameters,and therefore we attempt to

关键词： moment invariant neural network SEM membrane water flux

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Photo-Grafting Copolymerization of PP Nonwoven Fabric and Its Application for Acidic Dye Adsorption and Filtration

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Journal of Donghua University(English Edition) 2014年第3期31卷 354-361页

作者：石小丽刘颖宋欢万恒朱新生潘志娟 College of Textile and Clothing Engineering Soochow University College of Chemistry Chemical Engineering and Materials ScienceSoochow University Suzhou Institute for Advanced Study University of Science and Technology of China National Engineering Laboratory for the Modern Silk( Suzhou)

The monomer methacrylamido propyl trimethy ammonium chloride( MAPTAC) was copolymerized onto the fiber surface of polypropylene( PP) nonwoven fabric under ultroviole radiation. The weak acid red GN dye adsorption and adsorptive filtration performance of the resulted PP fabrics were *** results showed that the grafting copolymerization preferred to happen in the inner layer of the fabrics. The water flux of the grafted fabrics decreases with the increase of grafting yield. The collapse of the grafted polymer chains causes the flux increase in acidic condition,or vice versa at alkaline version. The coiling of the polyelectrolyte chains upon the dye adsorption seems to violate the routine assumption of the rigid substrate, and this gets the adsorption energy constant negative. The static adsorption process follows the Lagergren's pseudo-second order kinetic equation. The removals of circa( ca.) 100% of the total permeation volume3 500 mL simulated dye wastewater was reached during *** dye adsorbed fabrics were regenerated by the mixed media of the cationic surfactant / ethanol /water. The grafted fabric assumes stable fabric integrity and stability during permeation,and presents excellent dye adsorption capacity,easy desorption, and repeatable utilization.

关键词： polypropylene(PP) nonwoven fabric UV irradiation grafting copolymerization water flux dye adsorption filtration

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INFLUENCE OF AIR HUMIDITY ON THE SUPPRESSION OF FUGITIVE DUST BY USING A water-SPRAYING SYSTEM

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China Particuology 2006年第5期4卷 229-233页

作者： Peter Werner Grundnig Wilhelm Hoeflinger Gerd Mauschitz Zechang Liu Guiqin Zhang Zhiqiang Wang Institute of Chemical Engineering Vienna University of Technology A-1060 Vienna Austria Shandong University of Science and Technology Jinan Shandong P.R. China

One of the main origins of fugitive dust emission arises from bulk handling in quarries or mines, in particular, from bulk materials falling from a hopper or a conveyor belt. water-spraying systems, using two-phase nozzles, are one of the methods to suppress such dust emission. In this work we tried to develop a mathematical model to correlate air humidity, water flux through the nozzle and the dust （in particular PM10） emission, in order to improve the application and efficiency of these systems. Sand from the Yellow River in China was dropped from a conveyor belt into a dust chamber at 1 kg·min^-1, wherefrom the emitted dust was sucked off and quantified via a cascade impactor. A two-phase nozzle was installed in the dust chamber with a water flux through the nozzle of 1.2 to 3 L·h^-1, whereas the relative air humidity changed between 55 and 73%. Dust emission was found to be linearly dependent on relative air humidity. Furthermore model equations were developed to describe the dependence of PM10 emission on water flux and relative air humidity.

关键词： dust suppression spraying system air humidity water flux bulk solids fugitive dust emission

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