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Exploring the impact of stratification on the dynamics of bioconvective thixotropic fluid conveying tiny particles and Cattaneo-Christov model:Thermal storage system application

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Propulsion and Power Research 2024年第3期13卷 416-432页

作者： T.Oreyeni m.d.Shamshuddin A.m.Obalalu A.Saeed Nehad Ali Shah department of Physical Sciences Mathematics Programme UnitPrecious Cornerstone UniversityIbadanNigeria department of Computer Science and Artificial Intelligence(mathematics) SR UniversityWarangalTelangana State 506371India department of mathematics Augustine University Ilara EpeLagosNigeria Center of Excellence in Theoretical and Computational Science(TaCS-CoE) Faculty of ScienceKing Mongkut’s University of Technology Thonburi(KMUTT)126 Pracha Uthit Rd.BangModThung KhruBangkok 10140Thailand department of mathematics and Statistics College of ScienceImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh 11623Saudi Arabia

Stratified thermal storage promotes energy sustainability by storing excess energy during times of low demand for later use making it possible to integrate renewable energy sources like solar and *** communication discusses the significance of triple stratifica-tion using the Cattaneo-Christov model in the bioconvectiveflow of thixotropicfluid coexisting with nanoparticles and gyrotactic *** Cattaneo-Christov heat and massflux is incorporated into thefluid model allowing more accurate prediction of heat and mass phenomena in thefluid *** governing partial differential equations that describefluidflow are parametrized to yield an ordinary differential equation system by adopting suitable *** series solutions are obtained by applying the homotopy analysis method(ham).The effects of relevant parameters on the various profiles are revealed and accurately *** is observed that amplified thermal stratification lowers the temperature of ***,Brownian motion is used to illustrate the random movement of small particles suspended in liquids,and it is envisioned that the concentration distribution is significantly influenced by the Brownian motion of nanoparticles.

关键词： Cattaneo-Christov model Stratification Bioconvection Nanofluid

An Iterative Relaxation Approach to the Solution of the hamilton-Jacobi-Bellman-Isaacs Equation in Nonlinear Optimal Control

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IEEE/CAA Journal of Automatica Sinica 2018年第1期5卷 360-366页

作者： m.d.S.Aliyu department of Electrical Engineering King Faisal University Al-Ahsa 31982 Saudi Arabia IEEE

In this paper, we propose an iterative relaxation method for solving the hamilton-Jacobi-Bellman-Isaacs equation(HJBIE) arising in deterministic optimal control of affine nonlinear systems. Local convergence of the method is established under fairly mild assumptions, and examples are solved to demonstrate the effectiveness of the method. An extension of the approach to Lyapunov equations is also discussed. The preliminary results presented are promising, and it is hoped that the approach will ultimately develop into an efficient computational tool for solving the HJBIEs.

关键词： Affine nonlinear system bounded continuous function convergence hamilton-Jacobi-Bellman-Isaacs equation Lyapunov equation relaxation method Riccati equation

multi-redox phenazine/non-oxidized graphene/cellulose nanohybrids as ultrathick cathodes for high-energy organic batteries

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Nano Research 2021年第5期14卷 1382-1389页

作者： Youngjin ham Vitalii Ri Jin Kim Yeoheung Yoon Jinho Lee Kisuk Kang Ki-Seok An Chunjoong Kim Seokwoo Jeon department of materials Science and Engineering Advanced Battery CenterKorea Advanced Institute of Science and Technology(KAIST)Daejeon34141Republic of Korea department of materials Science and Engineering Chungnam National UniversityDaejeon34134Republic of Korea Thin Film materials Research Center Korea Research Institute of Chemical Technology(KRICT)Daejeon34114Republic of Korea department of materials Science and Engineering Seoul National UniversitySeoul08826Republic of Korea

Various redox-active organic molecules can serve as ideal electrode materials to realize sustainable energy storage systems. Yet, to be more appropriate for practical use, considerable architectural engineering of an ultrathick, high-loaded organic electrode with reliable electrochemical performance is of crucial importance. Here, by utilizing the synergetic effect of the non-covalent functionalization of highly conductive non-oxidized graphene flakes (NOGFs) and introduction of mechanically robust cellulose nanofiber (CNF)-intermingled structure, a very thick (≈ 1 mm), freestanding organic nanohybrid electrode which ensures the superiority in cycle stability and areal capacity is reported. The well-developed ion/electron pathways throughout the entire thickness and the enhanced kinetics of electrochemical reactions in the ultrathick 5,10-dihydro-5,10-dimethylphenazine/NOGF/CNF (dmPZ-NC) cathodes lead to the high areal energy of 9.4 mWh·cm−2 (= 864 Wh·kg−1 at 158 W·kg−1). This novel ultrathick electrode architecture provides a general platform for the development of the high-performance organic battery electrodes.

关键词： energy storage organic electrodes batteries graphene cellulose nanofibers

Fundamental principles and development of proximity-field nanopatterning toward advanced 3d nanofabrication

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Nano Research 2021年第9期14卷 2965-2980页

作者： Sang-Hyeon Nam Gayea Hyun donghwi Cho Seonggon Han Gwangmin Bae Haomin Chen Kisun Kim Youngjin ham Junyong Park Seokwoo Jeon department of materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea department of mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina School of materials Science and Engineering Kumoh National Institute of TechnologyGumiGyeongbuk 39177Republic of Korea department of Energy Engineering Convergence Kumoh National Institute of TechnologyGumiGyeongbuk 39177Republic of Korea KAIST Institute for NanoCentury(KINC) KAISTDaejeon 34141Republic of Korea

Three-dimensional(3d)nanoarchitectures have offered unprecedented material performances in diverse applications like energy storages,catalysts,electronic,mechanical,and photonic *** outstanding performances are attributed to unusual material properties at the nanoscale,enormous surface areas,a geometrical uniqueness,and comparable feature sizes with optical *** the practical use of the unusual nanoscale properties,there have been developments for macroscale fabrications of the 3d nanoarchitectures with process areas over centimeter *** the many fabrication methods for 3d structures at the nanoscale,proximity-field nanopatterning(PnP)is one of the promising techniques that generates 3d optical holographic images and transforms them into material structures through a lithographic *** conformal and transparent phase masks as a key factor,the PnP process has advantages in terms of stability,uniformity,and reproducibility for 3d nanostructures with periods from 300 nm to several *** merits of realizing precise 3d features with sub-100 nm and rapid processes are attributed to the interference of coherent light diffracted by phase *** this review,to report the overall progress of PnP from 2003,we present a comprehensive understanding of PnP,including its brief history,the fundamental principles,symmetry control of 3d nanoarchitectures,material issues for the phase masks,and the process area expansion to the wafer-scale for the target ***,technical challenges and prospects are discussed for further development and practical applications of the PnP technique.

关键词： proximity-field nanopatterning three-dimensional(3d)nanostructures phase mask interference lithography

Iterative computational approach to the solution of the hamilton-Jacobi-Bellman-lsaacs equation in nonlinear optimal control

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Control Theory and Technology 2018年第1期16卷 38-48页

作者： m. d. S. ALIYU department of Electrical Engineering King Faisal University AI-Ahsa 31982 Saudi Arabia

In this paper, iterative or successive approximation methods for the hamilton-Jacobi-Bellman-lsaacs equations （HJBIEs） arising in both deterministic and stochastic optimal control for affine nonlinear systems are developed. Convergence of the methods are established under fairly mild assumptions, and examples are solved to demonstrate the effectiveness of the methods. However, the results presented in the paper are preliminary, and do not yet imply in anyway that the solutions computed will be stabilizing. more improvements and experimentation will be required before a satisfactory algorithm is developed.

关键词： hamilton-Jacobi-Bellman-lsaac equation vector identity fixed-point theory successive approximation method,bounded continuous functions convergence Riccati equation

deep learning acceleration of multiscale superresolution localization photoacoustic imaging

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Light(Science & Applications) 2022年第6期11卷 1166-1177页

作者： Jongbeom Kim Gyuwon Kim Lei Li Pengfei Zhang Jin Young Kim Yeonggeun Kim Hyung ham Kkim Lihong V.Wang Seungchul Lee Chulhong Kim departments of Electrical Engineering Mechanical EngineeringConvergence IT Engineeringand Interdisciplinary Bioscience and BioengineeringGraduate School of Artificial IntelligenceMedical Device Innovation CenterPohang University of Science and Technology(POSTECH)77 Cheongam-roNam-guPohangGyeongbuk 37673Republic of Korea Caltech Optical Imaging Laboratory Andrew and Peggy Cherng Department of Medical EngineeringDepartment of Electrical EngineeringCalifornia Institute of Technology1200 E.California Blvd.MC 138-78PasadenaCA 91125USA School of Precision Instruments and Optoelectronics Engineering Tianjin University92 Weijin RoadNankai DistrictTianjin 300072China Opticho 532CHANGeUP GROUND87 Cheongam-roNam-guPohangGyeongsangbuk 37673Republic of Korea

A superresolution imaging approach that localizes very small targets,such as red blood cells or droplets of injected photoacoustic dye,has significantly improved spatial resolution in various biological and medical imaging ***,this superior spatial resolution is achieved by sacrificing temporal resolution because many raw image frames,each containing the localization target,must be superimposed to form a sufficiently sampled high-density superresolution ***,we demonstrate a computational strategy based on deep neural networks(dNNs)to reconstruct high-density superresolution images from far fewer raw image *** localization strategy can be applied for both 3d label-free localization optical-resolution photoacoustic microscopy(OR-PAm)and 2d labeled localization photoacoustic computed tomography(PACT).For the former,the required number of raw volumetric frames is reduced from tens to fewer than *** the latter,the required number of raw 2d frames is reduced by 12 ***,our proposed method has simultaneously improved temporal(via the dNN)and spatial(via the localization method)resolutions in both label-free microscopy and labeled ***-learning powered localization PA imaging can potentially provide a practical tool in preclinical and clinical studies requiring fast temporal and fine spatial resolutions.

关键词： deep frames networks

Assessing Levels and Health Risks of Fluoride and Heavy metal Contamination in drinking Water

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Journal of Geoscience and Environment Protection 2022年第11期10卷 15-34页

作者： Ali Sanou Namory méité Amadou kouyaté Elisephane Irankunda Alfred Niamien Kouamé Aka Eric Koffi Koffi Jean-Paul Bohoussou Lébé Prisca m.-S. Kouakou Institut National Polytechnique Félix Houphouë t-Boigny (INP-HB) Laboratoire des Procédés Industriels de Synthèses de l’Environnement et des Energies Nouvelles (LAPISEN) Yamoussoukro C&#244 te d’Ivoire Institut National Polytechnique Félix Houphouë t-Boigny (INP-HB) Laboratoire de Thermodynamique Traitement et Sciences des Surfaces et Interfaces Ingénierie et Physicochimie des Procédés et de Mécanique des Matériaux (L2-TSIPM) Yamoussoukro C&#244 te d’Ivoire Ecole Normale Supérieure (ENS) Laboratoire des Sciences Physiques Fondamentales et Appliquées (LSPFA) Abidjan C&#244 te d’Ivoire Université Félix Houphouë t-Boigny (UFHB) UFR SSMT Laboratoire de Constitution et Réaction de la Matière (LCRM) Abidjan C&#244 te d’Ivoire Université Félix Houphouë t-Boigny (UFHB) UFR SSMT Laboratoire de Constitution et Réaction de la Matière (LCRM) Abidjan C&#244te d’Ivoire Laboratoire des Sciences et Technologies de l’Environnement UFR Environnement Université Jean Lorougnon Guédé Daloa C&#244 te d’Ivoire School of Computer Science and Information Technology The East African University Kajiado Kenya

A systematic study was carried out to assess the level of contamination with fluorides and heavy metals in the drinking water of the city of daloa as well as the risks to the health of consumers. The waters of 11.11% of the sites sampled exceeded the fluoride limit for drinking water with a contamination index (CI) greater than 0. All the waters recorded concentrations of cadmium (Cd), copper (Cu), iron (Fe), manganese (mn) and lead (Pb) above the recommended values with CI > 0. However, 22.22% of the sites recorded concentrations below the standard for zinc (Zn) with IC ment of adverse effects on human health showed that the chronic daily intake (CdI) of fluorine and metals was less than 1 (CdI dults and children except for Zn where the CdI > 1 for children in 22.22% of drinking water studied. HQs have an average of less than 1 for fluorine and greater than 1 for all metals. moreover, the danger indices have values greater than 1. The incremental lifetime cancer risk (ILCR) and the total ILCR are above the recommended values. These results showed that the drinking water sampled is of poor quality due to higher levels of heavy metals, which can constitute a danger to human health. Long-term use of one of these poor quality waters can lead to cancer in consumers. It is therefore necessary to treat this water in order to eliminate the metals before using it for drinking. This study can help decision-makers and competent authorities in charge of water management.

关键词： Physico-Chemical Parameters Fluoride Heavy metals drinking Water Sanitary Risks

On the mHd squeeze flow between two parallel disks with suction or injection via ham and HPm

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Frontiers of mechanical Engineering 2014年第3期9卷 270-280页

作者： d. d. GANJI m. ABBASI J. RAHImI m. GHOLAmI I. RAHImIPETROUdI department of mechanical Engineering Babol University of Technology Babol Iran department of mechanical Engineering Sari Branch Islamic AzadUniversity Sari Iran department of Electrical and Computer Engineering Babol Universityof Technology Babol Iran department of mechanical Engineering College of Mechanic TehranScience and Research Branch Islamic Azad University Darnavand Iran

An analysis has been performed to study the problem of magneto-hydrodynamic （mHd） squeeze flow of an electrically conducting fluid between two infinite, parallel disks. The analytical methods called Homotopy Analysis method （ham） and Homotopy Perturbation method （HPm） have been used to solve nonlinear differential equations. It has been attempted to show the capabilities and wide-range applications of the proposed methods in comparison with a type of numerical analysis as Boundary Value Problem （BVP） in solving this problem. Also, the velocity fields have been computed and shown graphically for various values of physical parameters. The objective of the present work is to investigate the effect of squeeze Reynolds number, Hartmann number and the suction/injection parameter on the velocity field. Furthermore, the results reveal that ham and HPm are very effective and convenient.

关键词： Homotopy Analysis method Homotopy Perturbation method incompressible flow magneto-hydrodynamic flow parallel disks

Unsteady time-dependent incompressible Newtonian fluid flow between two parallel plates by homotopy analysis method(ham),homotopy perturbation method(HPm)and collocation method(Cm)

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Propulsion and Power Research 2018年第3期7卷 247-256页

作者： m.R.Shirkhani H.A.Hoshyar I.Rahimipetroudi H.Akhavan d.d.Ganji department of mechanical Engineering Sari BranchIslamic Azad UniversitySariIran Young Researchers Club Sari BranchIslamic Azad UniversitySariIran department of mechanical Engineering Ghaemshahr BranchIslamic Azad UniversityGhaemshahrIran

Analytical and numerical analyses have performed to study the problem of the flow of incompressible Newtonian fluid between two parallel plates approaching or receding from each other *** Navier–Stokes equations have been transformed into an ordinary differential equation using a similarity *** powerful analytical methods called collocation method(Cm),the homotopy perturbation method(HPm),and the homotopy analysis method(ham)have been used to solve nonlinear differential *** has been attempted to show the capabilities and wide-range applications of the proposed methods in comparison with a type of numerical analysis as fourth-order Runge–Kutta numerical method in solving this ***,velocity fields have been computed and shown graphically for various values of physical *** objective of the present work is to investigate the effect of Reynolds number and suction or injection characteristic parameter on the velocity field.

关键词： Homotopy analysis method(ham) Collocation method(Cm) Homotopy perturbation method(HPm) Parallel porous plates Unsteady flow