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Free vibration and buckling analysis of polymeric composite beams reinforced by functionally graded bamboo fbers

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Applied math.matics and mech.nics(English.edition) 2024年第3期45卷 543-562页

作者： h.m.FEIZABAD m.h.YAS Department of mech.nical Engineering Razi UniversityKermanshah ***Iran

Natural fibers h.ve been extensively research.0} as reinforcement materials in polymers on account of th.ir environmental and economic advantages in comparison with.synth.tic fibers in th. recent *** fibers are renowned for th.ir good mech.nical properties,abundance,and sh.rt cycle *** beams are one of th. fundamental structural components and are susceptible to mech.nical loads in engineering applications,th.s paper performs a study on th. free vibration and buckling responses of bamboo fiber reinforced composite(BFRC)beams on th. elastic *** different functionally graded(FG)layouts and a uniform one are th. considered distributions for unidirectional long bamboo fibers across th. *** elastic properties of th. composite are determined with.th. law of *** hamilton’s principle,th. governing equations of motion are *** generalized differential quadrature meth.d(GDQm)is th.n applied to th. equations to obtain th. *** ach.eved outcomes exh.bit th.t th. natural frequency and buckling load values vary as th. fiber volume fractions and distributions,elastic foundation stiffness values,and boundary conditions(BCs)and slenderness ratio of th. beam ***,a comparative study is conducted between th. derived analysis outcomes for BFRC and h.mogenous polymer beams to examine th. effectiveness of bamboo fibers as reinforcement materials,demonstrating th. significant enh.ncements in both.vibration and buckling responses,with.th. exception of natural frequencies for cantilever beams on th. Pasternak foundation with.th. FG-◇fiber ***,th. obtained analysis results of BFRC beams are also compared with.th.se for carbon nanotube reinforced composite(CNTRC)beams found in th. literature,indicating th.t th. buckling loads and natural frequencies of BFRC beams are lower th.n th.se of CNTRC beams.

关键词： bamboo fiber free vibration buckling analysis functionally graded(FG)beam elastic foundation generalized differential quadrature meth.d(GDQm)

Classification and tech.ical target of water electrolysis for h.drogen production

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Journal of Energy Ch.mistry 2024年第8期95卷 554-576,I0012页

作者： Kah.un ham Sooan Bae Jaeyoung Lee Ertl Center for Electroch.mistry and Catalysis Gwangju Institute of Science and Technology(GIST)123 Cheomdangwagi-RoBuk-guGwangju 61005South Korea Department of h.terogeneous Reactions Max Planck Institute for Chemical Energy ConversionStiftstr.34-36Mülheim an der RuhrGermany Sch.ol of Earth.Sciences and Environmental Engineering GIST123 CheomdangwagiroBuk-guGwangju 61005South Korea International Future Research.Center of Ch.mical Energy Storage and Conversion Processes GIST123 CheomdangwagiroBuk-guGwangju 61005South Korea eSuS Co. Ltd.#408S6 BuildingSchool of Environment and Energy EngineeringGIST123 CheomdangwagiroBuk-guGwangju 61005South Korea

Continuous efforts are underway to reduce carbon emissions worldwide in response to global climate *** electrolysis tech.ology,in conjunction with.renewable energy,is considered th. most feasible h.drogen production tech.ology based on th. viable possibility of large-scale h.drogen production and th. zero-carbon-emission nature of th. ***,for h.drogen produced via water electrolysis systems to be utilized in various fields in practice,th. unit cost of h.drogen production must be reduced to$1/kg h.(2).To ach.eve th.s unit cost,tech.ical targets for water electrolysis h.ve been suggested regarding components in th. *** th.s paper,th. types of water electrolysis systems and th. limitations of water electrolysis system components are *** suggest guideline with.recent trend for ach.eving th.s tech.ical target and insigh.s for th. potential utilization of water electrolysis tech.ology.

关键词： Water electrolysis h.drogen production Tech.ical target Electroch.mistry

Influence of erbium on structural,and ch.rged particles,ph.tons,and neutrons sh.elding properties of Ba_(1-x)Er_(x)SnO_(3) perovskite ceramics

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Journal of Rare Earth. 2024年第4期42卷 724-732页

作者： m.K.h.hamad Nidal Dwaikat m.h.A.mh.reb m.I.Sayyed R.m.hamad Y.S.m.Alajerami m.A.Almessiere Gameel Saleh.Ah.ad h.ssein Alomari K.A.Ziq Department of Basic Sciences School of Social and Basics SciencesAl Hussein Technical UniversityKing Abdullah II St 242Amman11831Jordan Department of Ph.sics College of Engineering and PhysicsInterdisciplinary Research Center for Advanced MaterialsKing Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Department of Ph.sics College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia Basic and Applied Scientific Research.Center Imam Abdulrahman Bin Faisal UniversityP0.Box 1982Dammam31441Saudi Arabia Department of Ph.sics Faculty of ScienceIsra UniversityAmman11622Jordan Department of Nuclear medicine Research Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPo.Box 1982Dammam31441Saudi Arabia medical Imaging Department Applied Medical Sciences FacultyAl Azhar University-Gaza CityPo.Box 1277Palestine Department of Bioph.sics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPo.Box1982Dammam 31441Saudi Arabia Department of Biomedical Engineering College of EngineeringImam Abdulrahman Bin Faisal UniversityPo.Box 1982Dammam31441Saudi Energy&minerals Regulatory Commission Amman11821Jordan

Five perovskite ceramics samples of Ba_(1-x)Er_(x)SnO_(3) with.x=0.00,0.05,0.10,0.15,and 0.20 were synth.sized using th. conventional solid-state reaction *** prepared samples were ch.racterized by X-ray diffraction(XRD),Fourier transforms infrared(FTIR),and UV-Vis *** sh.elding properties against ionizing radiation were also *** XRD analysis sh.ws th. perovskite cubic structure as th. major ph.se in all *** FTIR reveals a distinctive band around 614-620 cm^(-1) ascribed to th. antisymmetric O-Sn-O ***-Vis spectroscopy was used to determine th. bandgap according to diffuse reflectance,and th. results display a fixed enh.ncement in th. bandgap from 3.2 to 3.3 eV for all ***-ray sh.elding properties of th. synth.sized samples were experimentally measured and compared with.XCOm computational *** relative differences(Δ,%)between experimental and th.o retical values are low and fall with.n th. 0.446%-7.10%*** addition of Er leads to th. enh.nced density,neutron,and gamma sh.elding *** contrast,ch.rged particles’sh.elding parameters gradually reduce with.rising Er *** results suggest th.t Ba_(1-x)Er_(x)SnO_(3) samples can be used in different radiation sh.elding applications.

关键词： Perovskite Ceramics Gamma ray sh.elding mass stopping power Rare earth.

Impact of carbimazole combined with.vitamin E on testicular injury induced by experimental h.perth.roidism in adult albino rats:oxidative/inflammatory/apoptotic path.ays

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Asian Journal of Andrology 2024年第4期26卷 396-401页

作者： Ramadan S h.ssein moustafa m Eyada Rash.d m mostafa Samah.m Elaidy Sh.reen h.Elsayed h.ny m Saad Department of Dermatology College of Medicine Prince Sattam Bin Abdulaziz UniversityAl-Kharj 16242Saudi Arabia Department of Dermatology Andrology and STDsAssiut Police HospitalAssiut 71525Egypt Department of Dermatology Venereology and AndrologyFaculty of MedicineSuez Canal UniversityIsmailia 41522Egypt Department of Andrology and Sexology Faculty of MedicineSuez Canal UniversityIsmailia 41511Egypt Department of Clinical Ph.rmacology Faculty of MedicineSuez Canal UniversityIsmailia 41511Egypt Department of Reh.bilitation Sciences Faculty of Health and Rehabilitation SciencesPrincess Nourah bint Abdulrahman UniversityRiyadh 12271Saudi Arabia.

Th.roid h.rmones play essential roles in spermatogenesis,but th.ir effects on infertile males remain poorly *** study aimed to evaluate th. impact of combining carbimazole(CBZ)with.vitamin E(VE)on testicular injury induced by experimental h.perth.roidism in adult albino rats,focusing on oxidative,inflammatory,and apoptotic *** th.s experimental study,64 adult male albino Wistar rats were divided into eigh. groups:Group I(control-untreated),Group II(CBZ-control),Group III(VE-control),Group IV(CBZ+VE-control),Group V(levoth.roxine-induced testicular injury),Group VI(levoth.roxine+CBZ-treated),Group VII(levoth.roxine+VE-treated),and Group VIII(levoth.roxine+CBZ+VE-treated).Th. study was conducted in th. Faculty of medicine,Suez Canal University(Ismailia,Egypt).After cervical decapitation,both.testes and epididymis were examined h.stopath.logically and *** differences were observed among groups concerning malondialdeh.de(mDA),glutath.one(GSh.,superoxide dismutase(SOD),and catalase(CAT;all Pmerase ch.in reaction analysis sh.wed significant differences in tumor necrosis factor-α(TNF-α),interleukin-10(IL-10),Bcl-2-associated X protein(BAX),B-cell lymph.ma 2 protein(Bcl2),p53,Caspase-3,Caspase-8,Caspase-9,and nuclear factor-kappa B(NF-κB)mRNA levels(all Ph.perth.roid group treated with.CBZ alone(Group VI)exh.bited testicular side effects,affecting seminiferous tubules and ***,th. Group VIII sh.wed improved spermatogenesis and a decrease in testicular side *** addition of VE to th. treatment of h.perth.roid rats with.CBZ reduced testicular side effects and seminiferous tubular affection wh.n potentially improving *** research.is needed to elucidate th. underlying mech.nisms fully.

关键词： antith.roid drugs testicular injury th.roid gland vitamin E

Novel synth.sis of stabilized Bi_(1-x-y)Gd_xDy_yO_(1.5) solid electrolytes with.enh.nced conductivity for intermediate temperature solid oxide fuel cells(SOFCs)

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Journal of Rare Earth. 2024年第10期42卷 1903-1911页

作者： Ah.ed h.Ibrah.m Yeh.a m.Abbas h.A.Ayoub marwa h.Ali mustafa Aldoori materials Science Laboratory Physics DepartmentFaculty of ScienceSuez Canal University41522IsmailiaEgypt ministry of h.gh.r education and Scientific Research Aliraqia University10011BaghdadIraq

h.rein,we report th. synth.sis of a Dy-Gd co-doped cubic ph.se-stabilized Bi_(2)O_(3) solid electrolyte system via solid-state processing under atmosph.ric *** with.Dy^(3+) and Gd^(3+) h.s been observed to significantly enh.nce th. densification process during sintering for stabilization purposes,th.reby improving th. electrical properties of δ-Bi_2O_(3)-type *** synth.sized ceramics were ch.racterized using X-ray diffraction(XRD),field emission scanning electron microscopy-energy dispersive X-ray spectroscopy(FESEm-edX),th.rmal gravimetry/differential th.rmal analysis(TG/DTA),and th. four-point probe tech.ique(4PPT).XRD analysis reveals th.t th. samples Bi_(1-x-y)Gd_(x)Dy_(y)O_(1.5)(y=0.05/x=0.05,0.10,0,15,and 0.20,and x=0.05/y=0.10,0.15,and 0.20) exh.bit a stable face-centered cubic δ-ph.se and a mixed-ph.se crystallograph.c *** XRD analysis of th. stabilized δ-ph.se suggests th.t th. prepared oxides sh.w a face-centered cubic(FCC) structure with.a space group of *** micrograph. reveal th.t th. composition Bi_(0.90)Gd_(0.05)Dy_(0.05)O_(1.5) h.s no significant ***,an evident increase in th. pore formation is observed as th. amount of Gd_(2O_(3) increases until it reach.s 20%.Th.s finding suggests th.t dense pellets are formed during th. sintering process at 900-1000℃.Th. DTA analyses were performed to verify th. ph.se stability,wh.ch.agrees with.th. XRD *** electroch.mical performance of th. synth.sized Dy-Gd co-doped Bi_2O_(3)solid electrolyte system was evaluated and analyzed in detail by using th. electroch.mical impedance spectroscopy(EIS) tech.ique,Based on EIS and conductivity measurements,Bi_(0.75)Gd_(0.20)Dy_(0.05)O_(1.5) exh.bits th. lowest activation energy of 0.519 eV and th. h.gh.st conductivity value of 0.398 S/cm at 627℃compared to th. oth.r samples;th.s composition can be used as a solid electrolyte for intermediatetemperature solid oxide fuel cells(SOFCs).

关键词： Solid oxide fuel cells(SOFCs) Rare earth. Solid-state processing Rietveld Fast Fourier transform(FFT) Electroch.mical impedance spectroscopy(EIS)

Common coupled fixed point th.orem for two pairs compatible and sub-sequentially continuous mapping

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Journal of Ocean Engineering and Science 2024年第4期9卷 401-407页

作者： h.m.Abu-Donia mona S.Bakry h.A.Atia Omnia m.A.Kh.ter Ragh.a A.m.Attia Department of math.matics Faculty of ScienceZagazig UniversityZagazigEgypt Department of math.matics Faculty of ScienceTanta UniversityTantaEgypt Department of Basic Science Zagazig Higher Institute of Engineering and TechnologyZagazigEgypt Department of Basic Science Higher Technological Institute 10th of Ramadan CityEl Sharqia 44634Egypt

Th.s study establish.s a common coupled fixed point for two pairs of compatible and sequentially continuous mappings in th. intuitionistic fuzzy metric space th.t satisfy th.φ-contractive *** basic definitions and th.orems h.ve been used from some recent scientific papers about th. binary operator,t-norm,t-conorm,intuitionistic fuzzy metric space,and compatible mapping for reach.ng to th. paper’s purpose.

关键词： Intuitionistic fuzzy metric space φ-contractive mapping Compatible mappings Couple fixed point

Th. multi-impurity system in CdSe nanoplatelets:electronic structure and th.rmodynamic properties

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Communications in Th.oretical Ph.sics 2024年第3期76卷 165-173页

作者： D A Bagh.asaryan V A h.rutynyan E m Kazaryan h.A Sarkisyan Russian-Armenian University H Emin 1230051YerevanArmenia Institute of Applied Problems of Ph.sics 25 Nersisyan St0014YerevanArmenia

Th.s paper th.oretically studies th. impurity states and th. effects of impurity concentration and configuration on th. optical,electrical,and statistical properties of CdSe nanoplatelets(NPLs).An image ch.rge-based model of electron-impurity interaction is *** ch.rge-carrier energy spectra and corresponding wave functions depending on th. impurity number and configuration are *** electron binding energies are calculated for different NPL *** is sh.wn th.t th. image ch.rge-based interaction potential th.t arises due to th. dielectric constants mismatch.is much.stronger th.n th. interaction potential th.t does not take such.a mismatch.into ***,it is demonstrated th.t th. binding energies are increasing with.th. number of *** calculate th. canonical partition function using th. energy levels of th. electron,wh.ch.in turn is used to obtain th. mean energy,h.at capacity,and entropy of th. non-interacting electron *** th.rmodynamic properties of th. non-interacting electron gas th.t depend on th. geometric parameters of th. NPL,impurity number,configuration,and temperature are studied.

关键词： nanoplateletes th.rmodynamic properties impurity states

magnesium oxide(mgO)nanoadsorbents in wastewater treatment:A compreh.nsive review

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Journal of magnesium and Alloys 2024年第5期12卷 1709-1773页

作者： h.C.S.Perera V.Gurunanth.nan Anoop Singh.m.m.m.G.P.G.mantilaka G.Das Sandeep Arya Department of Ph.sics Khalifa UniversityAbu Dhabi12788United Arab Emirates Postgraduate Institute of Science University of PeradeniyaPeradeniyaSri Lanka Department of h.manities and Sciences Guru Nanak Institutions Technical CampusIbrahimpatnamHyderabad501506India Centre for Global h.alth.Research Saveetha Medical College and HospitalsSaveetha Institute of Medical and Technical SciencesChennai602105Tamil NaduIndia Department of Ph.sics University of JammuJammu and Kashmir180006India

Wastewater contamination by h.avy metals and synth.tic dyes presents a significant environmental ch.llenge,necessitating effective and sustainable separation *** review article provides a detailed examination of magnesium oxide(mgO)nanoparticles as an innovative nanoadsorbent for wastewater treatment,with.a specific focus on h.avy metal and dye *** review compreh.nsively explores various aspects of mgO nanoparticles,including th.ir structural ch.racteristics and synth.sis *** article delves into th. morph.logy and crystallograph.c arrangement of mgO nanoparticles,offering insigh.s into th.ir structural *** th. complexity of adsorption processes,th. review identifies and analyzes parameters influencing th. adsorption efficiency of mgO nanoparticles,such.as temperature,ph.contact time,initial concentration,and co-existing *** interplay between th.se parameters and th. adsorption capability of mgO nanoparticles emph.sizes th. importance of optimizing operational ***,th. review assesses various synth.sis meth.ds for mgO nanoparticles,including sol-gel,h.droth.rmal,precipitation,green synth.sis,solvoth.rmal,and template-assisted *** discusses th. advantages,limitations,and resulting nanoparticle ch.racteristics of each.meth.d,enabling readers to grasp th. implications of synth.sis processes on adsorption *** compreh.nsive review consolidates current insigh.s into th. effectiveness of mgO nanoparticles as a potent nanoadsorbent for removing h.avy metals and dyes from wastewater covering a wide spectrum of aspects related to mgO ***,th.re is a need to investigate th. use of mgO in th. treatment of actual wastewater or river water,in order to leverage its cost-effectiveness and h.gh.efficiency for practical water treatment applications in real-time.

关键词： mgO nanoparticles Nanoadsorbent Wastewater treatment h.avy metals Dye separation Adsorption Synth.sis meth.ds

Assessment of plant diversity of endemic species of th. Sah.ro-Arabian region in Egypt

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Journal of Arid Land 2024年第7期16卷 1000-1021,I0002-I0044页

作者： Asmaa S ABO h.TAB Yassin m AL-SODANY Kamal h.Sh.LTOUT Soliman A h.ROUN mohamed m EL-Kh.LAFY Botany and microbiology Department Faculty of ScienceKafrelsheikh UniversityKafrelsheikh 33511Egypt Botany Department Faculty of ScienceTanta UniversityTanta 31527Egypt

Savanna, semi-deserts, and h.t deserts ch.racterize th. Sah.ro-Arabian region, wh.ch.includes morocco, mauretania, Algeria, Tunisia, Libya, Egypt, Palestine, Kuwait, Saudi Arabia, Qatar, Bah.ain, th. United Arab Emirates, Oman, Yemen, south.rn Jordan, Syria, Iraq, Iran, Afgh.nistan, Pakistan, and north.rn India. Its neigh.oring regions, th. Sudano-Zambezian region belonging to th. Paleotropical Kingdom and th. mediterranean and Irano-Turanian regions included in th. h.larctic Kingdom, sh.re a large portion of th.ir flora with.th. Sah.ro-Arabian region. Despite th. widespread acknowledgment of th. region's global importance for plant diversity, an up to date list of th. Sah.ro-Arabian endemics is still unavailable. Th. available data are frequently insufficient or out of date at both.th. wh.le global and th. national scales. Th.refore, th. present study aims at screening and verifying th. Sah.ro-Arabian endemic plants and determining th. ph.togeograph.cal distribution of th.se taxa in th. Egyptian flora. h.nce, a preliminary list of 429 Sah.ro-Arabian endemic plants in Egypt was compiled from th. available literature. Indeed, by excluding th. species th.t were recorded in any countries or regions outside th. Sah.ro-Arabian region based on different literature, database reviews, and websites, th. present study h.s reduced th.s number to 126 taxa belonging to 87 genera and 37 families. Regarding th. national geograph.c distribution, South.Sinai is th. rich.st region with.83 endemic species compared with.oth.r eigh. ph.togeograph.c regions in Egypt, followed by th. Isth.ic Desert(th. middle of Sinai Peninsula, 53 taxa). Sah.ra regional subzone(SS1) distributes all th. 126 endemic species, Arabian regional subzone(SS2) owns 79 taxa, and Nubo-Sindian subzone(SS3) distributes only 14 endemics. Seven groups were recognized at th. fourth.level of classification as a result of th. application of th. two-way indicator species analysis(TWINSPAN) to th. Sah.ro-Arabian endemic sp

关键词： endemism ph.togeograph.cal regions Sah.ro-Arabian floristic region Egyptian flora plant diversity two-way indicator species analysis(TWINSPAN)