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  • Open Access

    ARTICLE

    Experimental Study and Numerical Simulation of Polymer Flooding

    Lei Bai1,2, Kai Li1,2,*, Ke Zhou3, Qingshan Wan1,2, Pengchao Sun1,2, Gaoming Yu3, Xiankang Xin3

    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1815-1826, 2022, DOI:10.32604/fdmp.2022.020271

    Abstract The numerical simulation of polymer flooding is a complex task as this process involves complex physical and chemical reactions, and multiple sets of characteristic parameters are required to properly set the simulation. At present, such characteristic parameters are mainly obtained by empirical methods, which typically result in relatively large errors. By analyzing experimentally polymer adsorption, permeability decline, inaccessible pore volume, viscosity-concentration relationship, and rheology, in this study, a conversion equation is provided to convert the experimental data into the parameters needed for the numerical simulation. Some examples are provided to demonstrate the reliability of the More > Graphic Abstract

    Experimental Study and Numerical Simulation of Polymer Flooding

  • Open Access

    ARTICLE

    Experimental Study on the Effect of the Inclination Angle on the Scouring Efficiency of Submerged Water Jets

    Zhibin Zhang1,2, Yongjun Gong1,*, Liping Zhang3, Min Xv2, Gaofeng Shang4

    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.5, pp. 1363-1371, 2022, DOI:10.32604/fdmp.2022.019746

    Abstract The effects of oblique submerged scouring jets on sand beds with various particle sizes have been studied experimentally. In particular, a total of 25 experiments have been carried out to explore the influences of the jet angle and application time on the considered submerged sand beds. Test results conducted with a specially-designed device have shown that the scouring efficiency attains a maximum when the inclination angle is in the range between 15° and 20° and then it decreases when the inclination angle becomes higher. More >

  • Open Access

    ARTICLE

    Dust Deposition’s Effect on Solar Photovoltaic Module Performance: An Experimental Study in India’s Tropical Region

    K. R. Chairma Lakshmi*, Geetha Ramadas

    Journal of Renewable Materials, Vol.10, No.8, pp. 2133-2153, 2022, DOI:10.32604/jrm.2022.019649

    Abstract A solar PV panel works with maximum efficiency only when it is operated around its optimum operating point or maximum power point. Unfortunately, the performance of the solar cell is affected by several factors like sun direction, solar irradiance, dust accumulation, module temperature, as well as the load on the system. Dust deposition is one of the most prominent factors that influence the performance of solar panels. Because the solar panel is exposed to the atmosphere, dust will accumulate on its surface, reducing the quantity of sunlight reaching the solar cell and diminishing output. In… More >

  • Open Access

    ARTICLE

    An integrated bioinformatics analysis and experimental study identified key biomarkers CD300A or CXCL1, pathways and immune infiltration in diabetic nephropathy mice

    WEI LIANG1,2,*, QIANG LUO1,2,#, ZONGWEI ZHANG1,2,#, KEJU YANG1,2,3, ANKANG YANG1,2, QINGJIA CHI4, HUAN HU5

    BIOCELL, Vol.46, No.8, pp. 1989-2002, 2022, DOI:10.32604/biocell.2022.019300

    Abstract Diabetic nephropathy (DN) is a common microvascular complication that easily leads to end-stage renal disease. It is important to explore the key biomarkers and molecular mechanisms relevant to diabetic nephropathy (DN). We used highthroughput RNA sequencing to obtain the genes related to DN glomerular tissues and healthy glomerular tissues of mice. Then we used LIMMA to analyze differentially expressed genes (DEGs) between DN and non-diabetic glomerular samples. And we performed KEGG, gene ontology functional (GO) enrichment, and gene set enrichment analysis to reveal the signaling pathway of the disease. The CIBERSORT algorithm based on support… More >

  • Open Access

    ARTICLE

    Modeling and Experimental Study for Automotive Dry Clutch Sliding Noise

    Jiali Yu, Zhili Xiang, Defeng Zhang, Yubing Gong*

    CMES-Computer Modeling in Engineering & Sciences, Vol.131, No.3, pp. 1653-1667, 2022, DOI:10.32604/cmes.2022.019280

    Abstract Automotive dry clutches have been found to produce a low frequency sliding noise in many applications, which challenges the ride comfort of vehicles. In order to study this clutch sliding noise, a detailed finite element model including both a pressure plate assembly and a driven plate assembly was developed. Based on this model, a complex eigenvalue analysis is performed in this research. The effect of several major factors on the clutch sliding noise, such as the coefficient of friction, the clamping force, the geometric imperfection of the friction plate, and the thermal deformation of the… More >

  • Open Access

    ARTICLE

    COVID-19 Lockdown in India: An Experimental Study on Promoting Mental Wellness Using a Chatbot during the Coronavirus

    V. P. Harshini Raji*, P. Uma Maheswari

    International Journal of Mental Health Promotion, Vol.24, No.2, pp. 189-205, 2022, DOI:10.32604/ijmhp.2022.011865

    Abstract India imposed the largest lockdown in the world in response to fight the spread of the Novel Coronavirus disease (COVID-19) from 19 March till 31 May 2020. The onset of the pandemic left the general public feeling psychosocially distressed, helpless, and anxious. The researcher developed a Messenger supported Chatbot, based on the broaden and build model, to cater to the healthy general public to promote positivity and mental well-being. 31 participants between 22 and 45 years old consensually took a pre-test, Chatbot intervention, and post-test. The Chatbot provided guided activities out of which positive affirmations, More >

  • Open Access

    ARTICLE

    Experimental Study on Improvement Effects of Completely Weathered Phyllite Using Red Clay and Cement for High-Speed Railway Embankments

    Xiushao Zhao1, Jianglong Rao1, Qijing Yang1,2,*, Yu Rong3, Zhitao Fu1, Zhiyao Wang1, Zixi Chen1

    Journal of Renewable Materials, Vol.10, No.5, pp. 1287-1305, 2022, DOI:10.32604/jrm.2022.017473

    Abstract Completely weathered phyllite (CWP) has the characteristics of difficult compaction, low shear strength after compaction and large settlement after construction. The traditional improvement method using a single agent of red clay or cement for CWP satisfies the subgrade requirements for ordinary railway, but cannot meet the requirements of immediate strength and long-term post-construction settlement of high-speed railway at the same time. A series of experimental investigations were undertaken for the blended CWP soils, with three additives used. The first additive was red clay, the second was cement and the third was a combination of both… More > Graphic Abstract

    Experimental Study on Improvement Effects of Completely Weathered Phyllite Using Red Clay and Cement for High-Speed Railway Embankments

  • Open Access

    ARTICLE

    Experimental Study on the Erosion of Pipelines under Different Load Conditions

    Xuewen Cao1, Ni Xiong1, Jian Li2, Zhenqiang Xie1, Xuerui Zang1, Jiang Bian1,*

    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.2, pp. 233-241, 2022, DOI:10.32604/fdmp.2022.018505

    Abstract The influence of the material stress state induced by internal and external forces on the erosion rate of pipelines has rarely been investigated in the literature. In order to fill this gap, using a tensile tester machine, a two–phase gas–solid particles jet erosion test was carried out considering a 316L stainless steel under different tensile stresses and different erosion angles. The results show that: 1) In the elastic range, with the increase of stress, the erosion rate manifests a rising trend; 2) In the metal plastic range, the increase of stress leads to a decrease More >

  • Open Access

    ARTICLE

    Experimental Study on the Performance of an Onboard Hollow-Fiber-Membrane Air Separation Module

    Yi Tu1, Yu Zeng2,*

    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.2, pp. 355-370, 2022, DOI:10.32604/fdmp.2022.018423

    Abstract Onboard air separation devices, based on hollow fiber membranes, are traditionally used for the optimization of aircraft fuel tank inerting systems. In the present study, a set of tests have been designed and executed to assess the air separation performances of these systems for different air inlet temperatures (70°C∼110°C), inlet pressures (0.1∼0.4 MPa), volume flow rates of nitrogen-enriched air (NEA) (30∼120 L/min) and flight altitudes (1.5∼18 km). In particular, the temperature, pressure, volume flow rate, and oxygen concentration of air, NEA and oxygen-enriched air (OEA) have been measured. The experimental results show that the oxygen concentration of More >

  • Open Access

    ARTICLE

    Experimental Study on Seepage Characteristics of a Soil-Rock Mixture in a Fault Zone

    Pengfei Wang1,2, Xiangyang Zhang1,*

    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.2, pp. 271-283, 2022, DOI:10.32604/fdmp.2022.017882

    Abstract A mixture of fault gouge and rubble taken out from a fault zone is used to prepare a S-RM (Soil-Rock Mixture) sample with rock block proportions of 20%, 30%, 40%, 50%, 60% and 70%, respectively. A GDS triaxial test system is used accordingly to measure the seepage characteristics of such samples under different loading and unloading confining pressures in order to determine the variation law of the permeability coefficient. The test results show that: (1) The permeability coefficient of the S-RM samples decreases as the pressure increases, and the decrease rate of this coefficient in… More >

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