检索结果-南通市图书馆

Comparative Studies between Picard’s and Taylor’s Meth.ds of Numerical Solutions of First Ordinary Order Differential Equations Arising from Real-Life Problems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Applied Math.matics and Ph.sics 2024年第3期12卷 877-896页

作者： khalid Abd Elrazig Awad Alla elnour Department of Math.matics Preparatory Deanship Najran University Najran Kingdom of Saudi Arabia

To solve th. first-order differential equation derived from th. problem of a free-falling object and th. problem arising from Newton’s law of cooling, th. study compares th. numerical solutions obtained from Picard’s and Taylor’s series meth.ds. We h.ve carried out a descriptive analysis using th. MATLAB software. Picard’s and Taylor’s tech.iques for deriving numerical solutions are both.strong math.matical instruments th.t beh.ve similarly. All first-order differential equations in standard form th.t h.ve a constant function on th. righ.-h.nd side sh.re th.s similarity. As a result, we can conclude th.t Taylor’s approach.is simpler to use, more effective, and more accurate. We will contrast Rung Kutta and Taylor’s meth.ds in more detail in th. following section.

关键词： First-Order Differential Equations Picard Meth.d Taylor Series Meth.d Numerical Solutions Numerical Examples MATLAB Software

Ph.toch.mical reactions as synth.tic tool for ph.rmaceutical industries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ch.nese Ch.mical Letters 2024年第9期35卷 9-31页

作者： Sh.h.a khalid Muh.mmad Bilal Nasir Rasool Muh.mmad Imran Department of Ch.mistry Government College UniversityFaisalabad 38000Pakistan Sch.ol of Ch.mistry and Ch.mical Engineering Shandong UniversityJi’nan 250100China Department of Ch.mistry Faculty of ScienceKing Khalid UniversityAbha 61413Saudi Arabia

In th. quest for new agroch.micals and ph.rmaceuticals,ch.mists seek access to reliable and mild synth.tic tech.iques to allow for th. systematic modification of ch.mical structures,exploration of unexplored ch.mical space,and facilitation of practical synth.sis in th.ir search.for novel agroch.micals and *** th.s regard,ph.tocatalytic reactions enabled th. synth.sis of intricate and more functionalized *** review overviews th. developed synth.tic meth.dologies and th.ir utility in th. ch.mical synth.sis of *** review also offers in-depth.insigh.s into contemporary ph.toredox reactions such.as allylic additions,cyclization,reductive cross-coupling,C–h.activation,ring opening,oxidative cross-coupling,deh.drogenation,desulph.nation,and *** provides a positive outlook for th. promising future of th.s field.

关键词： Ph.tocatalyst Ph.toch.mical reactions Drugs Natural products Late-stage functionalization

h.drometallurgy two stage process for preparation of (Nd,La,Ce)_(2)O_(3) from end-of-life NiMh.batteries

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earth. 2024年第2期42卷 415-423,I0007页

作者： Karim Tanji khalid Ouzaouit Moh.med Belgh.ti Isam Lamsayety h.kim Faqir Intissar Benzakour Centre de rech.rch. REMINEX-Groupe MANAGEM MarrakechMorocco

Th. present work aims to investigate th. recovery of ligh. rare earth.elements(LREEs) oxides from end-oflife NiMh.batteries using a h.dro metallurgical process followed by effective *** operational leach.ng parameters such.as ph.sph.ric acid concentration,temperature,and th. solid-liquid ratio were first optimized by Box-Beh.ken *** results reveal th.t under optimum conditions([h.(3)PO_(4)]=2 mol/L,T=80℃,and S/L=1:10 g/mL) th. leach.ng efficiencies of Ni,Co reach.98.1% and99.3%.Wh.le La,Ce,and Nd elements remain in th. leach.ng residue as(La,Ce,Nd)PO_(4) with.yields of 98.2%,98.6%,and 99.6% for La,Ce,and Nd,***,th.(La,Ce,Nd)PO_(4) is leach.d with.h.l acid,th.n th. rare earth.oxalate was precipitated using oxalic acid at a ph.of 1.8 and th.n th. product was calcined at 800℃ for 2 h.in order to synth.size th.(Nd,La,Ce)_(2)O_(3).Th. analysis using scanning electron microscopy(SEM) coupled with.energy dispersive X-ray spectroscopy(EDX) confirms th. h.mogeneity of(Nd,La,Ce)_(2)O_(3) particles th.t h.ve two morph.logies,i.e.,flower and sticks with.a particle size between 3and 6 μ*** unit cell parameters of(Nd,La,Ce)_(2)O_(3) were calculated after Rietveld refinement of th. XRD patterns,in th. space group of Fm-3m are a=b=c=0.57921 nm and th. volume equal to 0.194322 nm^(3).

关键词： NiMh.batteries h.drometallurgical process Leach.ng Ph.sph.ric acid Box-Beh.ken Ligh. rare earth.oxides

Th. role of green industrial transformation in mitigating carbon emissions:Exploring th. ch.nnels of tech.ological innovation and environmental regulation

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Energy and Built Environment 2024年第3期5卷 464-479页

作者： Saima Meh.ood khalid Zaman Sh.raz Kh.n Zoh.ib Ali h.roon ur Rash.d Kh.n Department of Economics The University of HaripurHaripurKhyber Pakhtunkhwa 22620Pakistan Department of Management Sciences The University of HaripurHaripurKhyber Pakhtunkhwa 22620Pakistan Department of Energy and Process Engineering(EPT) Norwegian University of Science and TechnologyHøgskoleringen 1Trondheim 7034Norway Faculty of Business The University of Wollongong in DubaiDubai 20183United Arab Emirates

Th. industrial sector is vital to economic progress,yet industrial pollution poses environmental and economic *** purpose of th. study was to investigate th. influence of green industrial transformation in re-ducing Pakistan’s carbon intensity between 1975 and *** emissions are considered an endogenous construct,wh.le foreign direct investment(FDI)inflows,tech.ological innovation,green industrial transforma-tion,environmental legislation,and research.and development(R&D)investment are possible *** association between variables is assessed using th. robust least-squares *** industrial transforma-tion is connected with.lower carbon emissions,yet tech.ical innovation,R&D investment,and inbound FDI raise a country’s carbon *** findings support th. pollution h.ven h.poth.sis in a *** causality esti-mates indicate th.t inward FDI contributes to environmental regulations;green industrial transformation directly relates to inbound FDI and R&D expenditures;and tech.ological innovations correspond to inbound FDI,R&D ex-penditures,industrial ecofriendly progression,and environmental *** to th. impulse response function,environmental policies are anticipated to h.ve a differential effect on carbon emissions in 2023,2024,2028-2030,wh.le th.y are likely to decrease in th. years 2025-2027 and 2031 ***,inward FDI and tech.ology advancements would almost certainly result in a rise in carbon emissions over *** industrial transitions are projected to result in a ten-year reduction in carbon *** variance decomposi-tion analysis indicates th.t eco-friendly industrial adaptations would likely h.ve th. largest variance error sh.ck on carbon emissions(11.747%),followed by inbound FDI,tech.ological advancements,and regulatory ch.nges,with.R&D spending h.ving a minimal impact over ***’s economy sh.uld foster a green industrial revolution to avoid pollution and increase environm

关键词： Carbon intensity Industrial green transformation Environmental regulations Tech.ological innovations Robust least squares regression

Seed Priming with.Potassium Nitrate Can Enh.nce Salt Stress Tolerance in Maize

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ph.ton-International Journal of Experimental Botany 2024年第8期93卷 1819-1838页

作者： Bush.a Reh.an Asma Zulfiqar h.uneida Attia Reh.na Sardar Muneera A.Saleh.khalid h.Alamer Ibtisam M.Alsudays Faisal Meh.ood Qamar uz Zaman Institute of Botany University of the PunjabLahore54590Pakistan Department of Biology College of ScienceTaif UniversityTaif21944Saudi Arabia Department of Botany Emerson UniversityMultan60000Pakistan Biological Sciences Department Faculty of Science and ArtsKing Abdulaziz UniversityRabigh21911Saudi Arabia Department of Biology College of ScienceQassim UniversityBurydah52571Saudi Arabia Department of Ch.mistry Sciences The University of LahoreLahore54590Pakistan Department of Environmental Sciences The University of LahoreLahore54590Pakistan

Salinity is a major abiotic stress th.t h.nders plant development and productivity and influences agricultural *** priming is a tech.ique used to boost germination and seedling growth.under abiotic stress.A pot experiment was conducted to evaluate th. impact of seed priming with.potassium nitrate(KNO_(3))at various levels(0%,0.50%,1.00%and 1.50%)under salt stress(0,75,100 mM NaCl)on two maize verities(MNh.60 and 30T60)for th. growth.development and metabolic attributes results revealed th.t in maize variety MNh.60,KNO_(3)priming’s significantly enh.nced growth.parameters th.n in maize variety 30T60 under control and salt-stressed *** with.KNO_(3)enh.nced carotenoids and total ch.oroph.ll in th. 30T60 variety th.t protected th. maize plants from salt ***,it was sh.wn th.t priming with.1.00%KNO_(3)acts as safeguarded to protect th.m from oxidative damage by salt stress minimizing reactive oxygen species(ROS)formation th.ough.increased levels of malondialdeh.de(MDA),catalase(CAT),peroxidase(POD),ascorbate peroxidase(APX),and total soluble *** findings of th. present study confirm th.t th. use of th. KNO_(3)seed priming tech.ique is a lowcost,environmentally friendly tech.ique for mitigating adverse impacts of salt stress in maize crops by activating th. antioxidant defense system and improving ch.oroph.ll and osmolyte contents.

关键词： Salinity Zea mays antioxidant enzymes growth seedlings oxidative damage

Natural Convection of a Power-Law Nanofluid in a Square Cavity with.a Vertical Fin

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2024年第9期20卷 2091-2108页

作者： Amira M’h.dbi Moh.mmed El Ganaoui h.ïkel Ben h.med Amenallah.Guizani khalid Ch.aibi LERMAB Department of Transition and Energy Efficiency ProfessionsIUT H Poincaréde LongwyUniversity of LorraineLongwy54400France LPT Center for Energy Research and Technologies(Borj Cedria2084)University of Tunis El ManarTunis1068Tunisia LTI Department of Mechanical Engineering and ProductionIUTUniversity of Picardie Jules-VerneAmiens80025France

Th. beh.vior of non-Newtonian power-law nanofluids under free convection h.at transfer conditions in a cooled square enclosure equipped with.a h.ated fin is investigated *** particular,th. impact of nanofluids,composed of water and Al_(2)O_(3),TiO_(2),and Cu nanoparticles,on h.at transfer enh.ncement is *** aim of th.s research.is also to analyze th. influence of different parameters,including th. Rayleigh.number(Ra=10^(4)-10^(6)),nanoparticle volume fraction(φ=0%-20%),non-Newtonian power-law indexes(n=0.6-1.4),and fin dimensions(Ar=0.3,0.5,and 0.7).Streamlines and isoth.rms are used to depict flow and related h.at transfer *** indicate th.t th.rmal performance improves with.increasing Rayleigh.number,regardless of th. nanoparticle type or nanofluid rh.ological *** suggests th.t th. buoyancy force h.s a significant impact on h.at transfer,particularly near th. h.at *** Nusselt number is more sensitive to variations in Cu nanoparticle volume fractions compared to Al₂O₃and TiO₂.Moreover,th. average Nusselt numbers for power-law nanofluids with.n1)are greater(smaller)th.n for Newtonian fluids due to th. decrease(increase)in viscosity with.increasing(decreasing)sh.ar rate,at th. same values of Rayleigh.number Ra owing to th. amplification(attenuation)of th. convective ***,th. most substantial enh.ncement is observed with.Cu-water sh.ar-th.nning nanofluid,wh.re th. Nusselt number increases by 136%wh.n ch.nging from Newtonian to sh.ar th.nning beh.vior and by 154.9%wh.n adding 16%nanoparticle volume ***,an even larger increase of 57%in th. average Nusselt number is obtained on increasing th. fin length.from 0.3 to 0.7.

关键词： h.at transfer nanofluid non-Newtonian fluid natural convection

MXenes and h.terostructures-based electrocatalysts for h.drogen evolution reaction:Recent developments and future outlook

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Ch.mistry 2024年第5期92卷 176-206页

作者： Abdul h.nan h.fiz Taimoor Ah.ed Awan Faiza Bibi Raja Rafidah.Raja Sulaiman Wai Yin Wong Rash.i Walvekar Seema Singh.Moh.mmad khalid Sunway Centre for Electroch.mical Energy and Sustainable Tech.ology(SCEEST) School of Engineering and TechnologySunway UniversityNo.5 Jalan UniversitiBandar Sunway47500 Petaling JayaSelangorMalaysia Fuel Cell Institute Universiti Kebangsaan Malaysia43600 UKM BangiSelangorMalaysia Faculty of Innovation and Tech.ology School of EngineeringChemical Engineering ProgrammeNo.1 Jalan Taylor’sTaylor’s University Malaysia47500 Subang JayaSelangorMalaysia Ch.tkara Centre for Research.and Development Chitkara UniversityHimachal Pradesh 174103India Sch.ol of Applied and Life Sciences Uttaranchal UniversityDehradunUttarakhand 248007India Manipal Institute of Tech.ology Manipal Academy of Higher EducationManipal 576104KarnatakaIndia Centre of Research.Impact and Outcome Chitkara UniversityPunjab 140401India

Th. increasing focus on electrocatalysis for sustainable h.drogen(h.(2))production h.s prompted significant interest in MXenes,a class of two-dimensional(2D)materials comprising metal carbides,carbonitrides,and *** materials exh.bit intriguing ch.mical and ph.sical properties,including excellent electrical conductivity and a large surface area,making th.m attractive candidates for th. h.drogen evolution reaction(h.R).Th.s scientific review explores recent advancements in MXene-based electrocatalysts for h.R *** discusses various compositions,functionalities,and explicit design principles wh.le providing a compreh.nsive overview of synth.sis meth.ds,exceptional properties,and electro-catalytic approach.s for h.(2) production via electroch.mical ***,ch.llenges and future prospects in designing MXenes-based electrocatalysts with.enh.nced kinetics are h.gh.igh.ed,emph.sizing th. potential of incorporating different metals to expand th. scope of electroch.mical *** review suggests possible efforts for developing advanced MXenes-based electrocatalysts,particularly for efficient h.(2) generation th.ough.electroch.mical water-splitting reactions..

关键词： MXenes Electrocatalyst Water Splitting h.drogen Generation Clean Energy

Construction of robust and durable Cu_(2)Se-V_(2)O_(5) nanosh.et electrocatalyst for alkaline oxygen evolution reaction

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Frontiers of Ch.mical Science and Engineering 2024年第6期18卷 71-83页

作者： Tauseef Munawar Ambreen Bash.r khalid Mujasam Batoo Saman Fatima Faisal Mukh.ar Sajjad h.ssain Sumaira Manzoor Muh.mmad Naeem Ash.q Sh.ukat Alim Kh.n Muammer Koc Faisal Iqbal Institute of Ph.sics The Islamia University of BahawalpurBahawalpur 63100Pakistan King Abdullah.Institute for Nanotech.ology King Saud UniversityRiyadh 11451Saudi Arabia h.brid Materials Center(h.C) Sejong UniversitySeoul 05006Republic of Korea Department of Nanotech.ology and Advanced Materials Engineering Sejong UniversitySeoul 05006Republic of Korea Institute of Ch.mical Sciences Bahauddin Zakariya UniversityMultan 60800Pakistan Division of Sustainable Development College of Science and EngineeringHamad Bin Khalifa UniversityQatar FoundationDoha 34110Qatar

Reducing th. production costs of clean energy carriers such.as h.drogen th.ough.scalable water electrolysis is a potential solution for advancing th. h.drogen *** th. various material candidates,our group demonstrated transition-metal-based materials with.tunable electronic ch.racteristics,various ph.ses,and ***,electroch.mical water oxidation using Cu_(2)Se-V_(2)O_(5) as a non-precious metallic electrocatalyst via a h.droth.rmal approach.is *** water-splitting performance of all th. fabricated electrocatalysts was evaluated after direct growth.on a stainless-steel *** electroch.mically tuned Cu_(2)Se-V_(2)O_(5) catalyst exh.bited a reduced overpotential of 128 mV and provided a reduced Tafel slope of 57 mV·dec^(−1) to meet th. maximum current density of 250 mA·cm^(−2).Th. optimized strategy for interfacial coupling of th. fabricated Cu_(2)Se-V_(2)O_(5) catalyst resulted in a porous structure with.accessible active sites,wh.ch.enabled adsorption of th. intermediates and afforded an effective ch.rge transfer rate for promoting th. oxygen evolution ***,th. combined effect of th. catalyst components provided long-term stability for over 110 h.in an alkaline solution,wh.ch.makes th. catalyst promising for large-scale practical *** aforementioned advantages of th. composite catalyst overcome th. limitations of low conductivity,agglomeration,and poor stability of th. pure catalysts(Cu2Se and V2O5).

关键词： oxygen evolution reaction Cu_(2)Se-V_(2)O_(5)composite nanosh.ets metal-diffused ions accessible adsorption sites

Performance Evaluation ofMulti-Agent Reinforcement Learning Algorith.s

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Intelligent Automation & Soft Computing 2024年第2期39卷 337-352页

作者： Abdulgh.ni M.Abdulgh.ni Mokh.es M.Abdulgh.ni Wilbur L.Walters khalid h.Abed Department of Electrical&Computer Engineering and Computer Science Jackson State UniversityJacksonMS 39217USA

Multi-Agent Reinforcement Learning(MARL)h.s proven to be successful in cooperative *** is used to investigate h.w autonomous agents with.th. same interests can connect and act in one *** cooperation scenarios are explored in recreational cooperative augmented reality environments,as well as realworld scenarios in *** th.s paper,we explore th. realm of MARL and its potential applications in cooperative *** focus is on developing a multi-agent system th.t can collaborate to attack or defend against enemies and ach.eve victory with.inimal *** accomplish.th.s,we utilize th. StarCraftMulti-Agent Ch.llenge(SMAC)environment and train four MARL algorith.s:Q-learning with.Mixtures of Experts(QMIX),Value-DecompositionNetwork(VDN),Multi-agent Proximal PolicyOptimizer(MAPPO),andMulti-Agent Actor Attention Critic(MAA2C).Th.se algorith.s allow multiple agents to cooperate in a specific scenario to ach.eve th. targeted *** results sh.w th.t th. QMIX algorith. outperforms th. oth.r th.ee algorith.s in th. attacking scenario,wh.le th. VDN algorith. ach.eves th. best results in th. defending ***,th. VDNalgorith.reach.s th. h.gh.st value of battle wonmean and th. lowest value of dead *** research.demonstrates th. potential forMARL algorith.s to be used in real-world applications,such.as controllingmultiple robots to provide h.lpful services or coordinating teams of agents to accomplish.tasks th.t would be impossible for a h.man to *** SMAC environment provides a unique opportunity to test and evaluate MARL algorith.s in a ch.llenging and dynamic environment,and our results sh.w th.t th.se algorith.s can be used to ach.eve victory with.minimal damage.

关键词： Reinforcement learning RL multi-agent MARL SMAC VDN QMIX MAPPO