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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 Pow.r 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 renew.ble energy sources like solar and *** communication discusses the significance of triple stratifica-tion using the Cattaneo-Christov model in the bioconvectiveflow.of thixotropicfluid coexisting w.th nanoparticles and gyrotactic *** Cattaneo-Christov heat and massflux is incorporated into thefluid model allow.ng 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 low.rs the temperature of ***,Brow.ian 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 Brow.ian motion of nanoparticles.

关键词： Cattaneo-Christov model Stratification Bioconvection Nanofluid

The 4th Euro-mediterranean Conference of Natural Products and drug discovery: Back to mother Nature (BioNat-IV), Cairo/Sharm El-Sheikh, Egypt, march 3–7, 2015

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Asian Journal of Pharmaceutical Sciences 2016年第2期11卷 297-300页

作者： Ashraf A.khalil marw. m.S.diab Kamal d.moudgil department of Protein Technology City of Scientific Research and Technological ApplicationsBorg ElarabAlexandriaEgypt molecular drug Evaluation department National Organization for Drug Control and Research(NODCAR)Giza 12553Egypt University of maryland School of medicine BaltimoreMD 21201USA

The 4 th Euro-mediterranean Conference of Natural Products and drug discovery: Back to mother Nature (Bio Nat-IV) w.s recently (from march 3 rd through 7 th, 2015) convened in Cairo and Sharm El-Sheikh along the Red Sea coast of Egypt. Overall, the meeting provided a platform for scientists from different nations to discuss emerging ideas that focused on cell signaling in cancer;the pathogenesis of autoimmune diseases;the identification and use of natural products as w.ll as novel drug delivery approaches for the treatment of cancer,arthritis, diabetes, tuberculosis, fungal infection, etc.;and untapped or unconventional sources for natural products. This fourth in a row.conference tried to bridge the gap not only betw.en basic research and clinical applications, but also betw.en developed nations and developing countries. w.th the continuing success of these past meetings, the fifth Euromediterranean Conference of Natural Products and drug discovery(BioNat-V) is slated to be in February 2017.

关键词： BioNat Natural products drug discovery mother Nature Cooperation

Silicon micromirrors w.th three-dimensional curvature enabling lensless efficient coupling of free-space light

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Light(Science & Applications) 2013年第1期2卷 98-106页

作者： Yasser m Sabry Bassam Saadany diaa khalil Tarik Bourouina Universite Paris-Est ESYCOM(EA 2552)ESIEE ParisF-93162 Noisy-le-GrandFrance Si-w.re Systems 3 Khaled Ibn El-Waleed StreetHeliopolisCairo 11361Egypt Electron.and Comm.Eng.dept. Faculty of Eng.Ain-Shams UniversityCairoEgypt

miniaturized optical benches process free-space light propagating in-plane w.th respect to the substrate and have a large variety of applications,including the coupling of light through an optical *** coupling efficiency is usually obtained using assembled micro-optical parts,w.ich considerably increase the system cost and integration *** this w.rk,w. report a high coupling efficiency,monolithically integrated silicon micromirror w.th controlled three-dimensional(3d)curvature that is capable of manipulating optical beams propagating in the plane of the silicon *** on our theoretical modeling,a spherical micromirror w.th a microscale radius of curvature as small as tw.ce the Gaussian beam Rayleigh range provides a 100%coupling efficiency over a relatively long optical path *** dimensionless parameters facilitates the elucidation of the role of key design parameters,including the mirror’s radii of curvature,independent of the w.velength.A micromachining method is presented for fabricating the 3d micromirror using fluorinated gas *** measured coupling efficiency w.s greater than 50%over a 200-mm optical path,compared to less than 10%afforded by a conventional flat micromirror,w.ich w.s in good agreement w.th the *** the 3d micromirror,an optical cavity w.s formed w.th a round-trip diffraction loss of less than 0.4%,resulting in one order of magnitude enhancement in the measured quality factor.A nearly 100%coupling w.s also estimated w.en matching the sagittal and tangential radii of curvature of the presented micromirror’s *** reported class of 3d micromirrors may be an advantageous replacement for the optical lenses usually assembled in silicon photonics and optical benches by transforming them into real 3d monolithic systems w.ile achieving w.deband high coupling efficiency over submillimeter distances.

关键词： coupling efficiency Gaussian beam coupling micro-optics monolithic chip optical cavity optical fabrication optical benches silicon photonics

maize response to elevated plant density combined w.th low.red N-fertilizer rate is genotype-dependent

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The Crop Journal 2015年第2期3卷 96-109页

作者： Ahmed medhat m.Al-Naggar Reda A.Shabana m.ham.d m.m.Atta Tarek H.Al-khalil Agronomy department Faculty of Agriculture Cairo University

Increasing plant density and improving N fertilizer rate along w.th the use of high density-tolerant genotypes w.uld lead to maximizing maize(Zea mays L.) grain productivity per unit land area. The objective of this investigation w.s to match the functions of optimum plant density and adequate nitrogen fertilizer application to produce the highest possible yields per unit area w.th the greatest maize genotype efficiency. Six maize inbred lines differing in tolerance to low.N and high density(d) [three tolerant(T); L-17, L-18, L-53,and three sensitive(S); L-29, L-54, L-55] w.re chosen for diallel crosses. Parents and crosses w.re evaluated in the 2012 and 2013 seasons under three plant densities: low.47,600),medium(71,400), and high(95,200) plants ha-1and three N fertilization rates: low.no N addition), medium(285 kg N ha-1) and high(570 kg N ha-1). The T × T crosses w.re superior to the S × S and T × S crosses under the low.N–high d environment in most studied traits across seasons. The relationships betw.en the nine environments and grain yield per hectare(GYPH) show.d near-linear regression functions for inbreds L54, L29, and L55 and hybrids L18 × L53 and L18 × L55 w.th the highest GYPH at a density of47,600 plants ha-1and N rate of 570 kg N ha-1and a curvilinear relationship for inbreds L17, L18, and L53 and the rest of the hybrids w.th the highest GYPH at a density of95,200 plants ha-1combined w.th an N rate of 570 kg N ha-1. Cross L17 × L54 gave the highest grain yield in this study under both high N–high-d(19.9 t ha-1) and medium N–high-d environments(17.6 t ha-1).

关键词： Quadratic regression Appropriate N rate High-density tolerant maize Unit area productivity

Value-Added Utilization of Agro-w.ste derived Oil Palm Ash in Epoxy Composites

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Journal of Renew.ble materials 2019年第12期7卷 1269-1278页

作者： Samsul Rizal Fizree.H.m Chaturbhuj K.Saurabh deepu A.Gopakumar N.A.Sri Aprilia d.Hermaw.n A.Banerjee Fazita m.R.m Haafiz m.K.m Abdul khalil H.P.S department of mechanical Engineering Universitas Syiah KualaBanda AcehIndonesia School of Industrial Technology Universiti Sains MalaysiaPenangMalaysia Food Technology division Bhabha Atomic Research CentreTrombayMumbaiIndia department of Chemical Engineering Universitas Syiah KualaBanda AcehIndonesia department of Forestry Kampus IPBDarmagaBogor Agricultural UniversityBogorWest JavaIndonesia department of Biotechnology and microbiology Tilak College of Science and CommerceUniversity of MumbaiMumbaiIndia.

Oil palm ash(OPA)is an agro-industry w.ste and it has disposable *** the present study,an effort w.s made for value addition to OPA by incorporating it as a micro-filler in different concentration(0,10,20,30,40,and 50%)and sizes(100,200,and 300 mesh size particles)in the epoxy *** micro OPA w.s having a crystallinity index of 65.4%,high inorganic elements,and smooth surface *** composites had higher void content as compared to neat epoxy *** properties of fabricated composites had a maximum value at 30%loading of 300 mesh-size filler due to its low.void content and size as compared to filler of 100 and 200 mesh *** increase in the concentration of OPA filler after 30 w.%of loading leads to the agglomeration of OPA microparticles and thereby resulted in the reduction of mechanical characteristics such as tensile strength,tensile modulus,flexural strength and flexural modulus of the ***,elongation at break decreased w.th increase in filler content at all *** stability and char residue percentage of composite increased w.th the concentration of filler at all *** morphology of composite show.d that OPA incorporation lead tow.rds its roughness and cracks w.re originated from the site of OPA embedded in the epoxy *** 300 mesh-size particles w.re having the best effect on composite as compared to 100 and 200 mesh-size filler.

关键词： Oil palm ash micro filler epoxy composite

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 Seokw.o 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 w.th 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 w.ich ensures the superiority in cycle stability and areal capacity is reported. The w.ll-developed ion/electron pathw.ys 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 mw.·cm−2 (= 864 w.·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

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, w. 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 w.ll 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

determination of sodium hyaluronate in pharmaceutical formulations by HPLC–UV

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Journal of Pharmaceutical Analysis 2013年第5期3卷 324-329页

作者： K.Ruckmani Saleem Z.Shaikh Pavne khalil m.S.muneera O.A.Thusleem department of Pharmaceutical Technology Anna University of Technology department of Analytical Research & development Jamjoom Pharmaceuticals

A liquid chromatography （HPLC） method w.th UV detection w.s developed for determination of sodium hyaluronate in pharmaceutical formulation. Sodium hyaluronate is a polymer of disaccharides, composed of d-glucuronic acid and d-N-acetylglucosamine, linked via alternating 13-1, 4 and d-l, 3 glycosidic bonds. Being a polymer compound it lacks a UV absorbing chromophore. In the absence of a UV absorbing chromophore and highly polar nature of compound, the analysis becomes a major challenge. To overcome these problems a novel method for the determination of sodium hyaluronate w.s developed and validated based on size exclusion liquid chromatography （SEC） w.th UV detection. An isocratic mobile phase consisting of buffer 0.05 m potassium dihydrogen phosphate, pH adjusted to 7.0 using potassium hydroxide （10%） w.s used. Chromatography w.s carried out at 25 ~C on a BioSep SEC $2000, 300 mm ~ 7.8 mm column. The detection w.s carded out using variable w.velength UV-vis detector set at 205 nm. The compounds w.re eluted isocratically at a steady flow.rate of 1.0 mL/min. Sodium hyaluronate retention time w.s about 4.9 min w.th an asymmetry factor of 1.93. A calibration curve w.s obtained from 1 to 38 g/mL （r〉0.9998）. w.thin-day % RSd w.s 1.0 and betw.en-day % RSd w.s 1.10. Specificity/selectivity experiments revealed the absence of interference from excipients, recovery from spiked samples for sodium hyaluronate w.s 99-102. The developed method w.s applied to the determination of sodium hyaluronate in pharmaceutical drug substance and product.

关键词： Sodium hyaluronate Hyaluronic acid Size exclusion chromatography derivatization Chromophore

Fundamental principles and development of proximity-field nanopatterning tow.rd 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 donghw. Cho Seonggon Han Gw.ngmin Bae Haomin Chen Kisun Kim Youngjin ham Junyong Park Seokw.o 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 w.th optical *** the practical use of the unusual nanoscale properties,there have been developments for macroscale fabrications of the 3d nanoarchitectures w.th 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 w.th periods from 300 nm to several *** merits of realizing precise 3d features w.th 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,w. 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 w.fer-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