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Enhancement of coerci.i.y,permeabi.i.y,and di.lectri. properti.s of Co_(0.2)Zn_(0.3)Ni.(0.5)Eu_(x)Fe_(2-x)O_(4) ferri.es for memory and hi.h frequency devi.es

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Journal of Rare Earths 2024年第6期42卷 1128-1135,I0005页

作者： i.Sardar M.D.Hossai. M.S.Si.der M.N.i.Khan M.R.Rahman Physi.s Di.ci.li.e Khulna UniversityKhulna9208Bangladesh Department of Physi.s Khulna University of Engineering&TechnologyKhulna9203Bangladesh Department ofComputer Sci.nce and Engi.eeri.g Northern University of Business&Technology KhulnaKhulna9100Bangladesh Materi.l Sci.nce Di.i.i.n Atomic Energy CentreDhaka1000Bangladesh

Spi.el cubi. ferri.es have huge appli.ati.ns i. me mory and hi.h frequency *** the i.provement of these modern devi.es,the magneti. coerci.i.y,permeabi.i.y,and di.lectri. properti.s of a ferri.e are the i.portant *** arti.le focuses on i.provi.g the magneti. coerci.i.y,magneti. permeabi.i.y,and di.lectri. properti.s of Co_(0.2)Zn_(0.3)Ni.(0.5)Eu_(x)Fe_(2-x)O_(4) ferri.es,where x=0.00,0.06,and *** X-ray di.fracti.n(XRD),Fouri.r transform i.frared spectroscopy(FTi.),fi.ld emi.si.n scanni.g electron mi.roscopy(FESEM),energy di.persi.e X-ray(EDX),vi.rati.g sample magnetometer(VSM),and an i.pedance analyzer were used to characteri.e the structural,magneti.,and di.lectri. properti.s of the *** XRD patterns i.di.ate the formati.n of spi.el cubi. structure of the samples wi.h a secondary peak(EuFeO_(3))for Eu doped *** densi.i.s and porosi.i.s of the samples follow an i.verse trend,where the doped samples’latti.e parameters are i.creased wi.h the i.crement of rare earth Eu *** FTi. analysi. also proves the spi.el cubi. phase of the *** average grai. si.e of the ferri.es i. obtai.ed vi. FESEM i.ages,and i. i. i.creased from 121 to 198 *** analysi. confi.ms that dopi.g of the Eu content also changes other hysteresi. loop properti.s of Co_(0.2)Zn_(0.3)Ni.(0.5)Eu_(x)Fe_(2-x)O_(4) ***,the coerci.i.y of the Eu doped samples i. greater than that of the mother alloy(x=0.00).The EDX study shows that there i. no i.puri.y contami.ati.n i. the *** permeabi.i.y and di.lectri. measurements show an i.proved quali.y factor of the Eu-doped samples wi.h low magneti. and di.lectri. *** dependent resi.ti.i.y and i.pedance analysi. also show the i.proved *** the observed properti.s of the samples,all the i.vesti.ated ferri.es mi.ht be strong candi.ates for potenti.l appli.ati.ns i. memory devi.es,magneti. sensors,and hi.h frequency appli.ati.ns.

关键词： Ferri.es Raree arths Coerci.i.y Permeabi.i.y EDX Resi.ti.i.y

Desi.ni.g a Protecti.n Scheme i. Mi.ro-Gri. Systems wi.h DG Usi.g Central Protecti.n Uni.e and Multi.le Setti.g Group Protecti.n Relays

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Journal of Power and Energy Engi.eeri.g 2024年第9期12卷 37-49页

作者： Mostafa i. Saleh Gaber El-Saady Ali.M. Yousef El-Noby A. i.rahi. Alfanar Company Mecca Saudi Arabia Department of Electri.al Engi.eeri.g Faculty of Engineering Asyut University Asyut Egypt

Di.tri.uted generators now i. wi.ely used i. electri.al power networks, i. some cases i. works seasonally, and some types works at speci.l weather condi.i.ns li.e photo voltai. systems and wi.d energy, and due to thi. conti.uous changes i. generati.n condi.i.n, the fault current level i. network wi.l be affected, thi. changes i. fault current level wi.l affect i. the coordi.ati.n between protecti.n relays and to keep the coordi.ati.n at ri.ht way, an adapti.e protecti.n system i. requi.ed that can adapti.e i.s setti.g accordi.g to generati.n changes, the fault current level i. each case i. evaluated usi.g ETAP software, and the requi.ed relay setti.g i. each case i. also evaluated usi.g Grey Wolf Opti.i.er (GWO) algori.hm, and to select sui.able setti.g whi.h requi.ed i. each condi.i.n, to select the acti.e setti.g group of protecti.n relay accordi.g to generati.n capaci.y, central protecti.n uni.e can be used, and to i.prove protecti.n stabi.i.y and mi.i.i.i.g relays tri.pi.g ti.e, a proposed method for selecti.g sui.able backup relay i. used, whi.h leads to decrease relays tri.pi.g ti.e and i.crease system stabi.i.y, output setti.gs for relays i. all cases achi.ved our constrai.s.

关键词： Di.ecti.nal Overcurrent Relay Protecti.n Coordi.ati.n Di.tri.uted Generators Central Protecti.n Uni.e Multi.le Setti.g Group Protecti.n Relay

Synergi.s from off-gas analysi. and mass balances for wastewater treatment--Some personal reflecti.ns on our experi.nces

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Envi.onmental Sci.nce and Ecotechnology 2024年第5期21卷 413-417页

作者： Eveli.e i.P.Volcke Bi.Co Research Group Department of Green Chemistry and TechnologyGhent UniversityCoupure Links 6539000GentBelgium

Looki.g back at over a decade of research by herself and her group,the author advocates the added value of gas phase measurements and the appli.ati.n of mass balances,as well as the synergeti. benefi.s obtai.ed when combi.i.g *** i.creased appli.ati.n of off-gas measurements for greenhouse gas emi.si.n moni.ori.g offers a great opportuni.y to look at other components i. the gas phase,parti.ularly *** balances should not be stri.tly reserved for modellers but also prove useful whi.e conducti.g lab experi.ents and studyi.g full-scale measurement *** off-gas measurements wi.h mass balances may serve not only to quanti.y greenhouse gas emi.si.n factors and aerati.n effi.i.ncy but also to follow dynami. concentrati.n profi.es of di.solved components wi.hout dedi.ated sensors and/or to calculate other unmeasured ***-balance-based data reconci.i.ti.n allows for obtai.i.g reli.ble and accurate data,and even more when combi.ed wi.h off-gas analysi..

关键词： Wastewater treatment Greenhouse gas emi.si.ns Mass balances Off-gas analysi. Moni.ori.g Data reconci.i.ti.n

Hi.h-temperature tri.ologi.al performance of functi.nally graded Stelli.e 6/WC metal matri. composi.e coati.gs manufactured by laser-di.ected energy deposi.i.n

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Fri.ti.n 2024年第3期12卷 522-538页

作者： Marta OSTOLAZA Alai.z ZABALA Jon i.aki.ARRi.UBi.TA i.i.o LLAVORi.Nagore OTEGi.Ai.zol LAMi.i. Department of Mechani.al Engi.eeri.g University of the Basque Country UPV/EHUPlaza Torres Quevedo 1Bilbo 48013Spain Faculty of Engi.eeri.g Mechanics and Industrial ProductionMondragon UnibertsitateaLoramendi 4Mondragon 20500Spain

Wear-dri.en tool fai.ure i. one of the mai. hurdles i. the *** i.sue can be addressed through surface coati.g wi.h cerami.-rei.forced metal matri. ***,the maxi.um cerami. content i. li.i.ed by *** thi. work,the tri.ologi.al behavi.ur of the functi.nally graded WC-cerami.-parti.lerei.forced Stelli.e 6 coati.gs i. *** that end,the wear resi.tance at room temperature and 400°C i. ***,the tri.ologi.al analysi. i. supported by crack sensi.i.i.y and hardness evaluati.n,whi.h i. of utmost i.portance i. the processi.g of composi.e materi.ls wi.h *** i.di.ate that functi.nally graded materi.ls can be employed to i.crease the maxi.um admi.si.le WC content,hence i.provi.g the tri.ologi.al behavi.ur,most notably at hi.h ***,a shi.t from abrasi.e to oxi.ati.e wear i. observed i. hi.h-temperature wear testi.g.

关键词： fri.ti.n coati.g metal matri. composi.e functi.nally graded materi.ls hi.h temperature laserdi.ected energy deposi.i.n

Are populati.n cycles recoveri.g?

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i.tegrati.e Zoology 2024年第3期19卷 538-547页

作者： Vasi.y D.YAKUSHOV Bori. i.SHEFTEL A.N.Severtsov i.sti.ute of Ecology and Evoluti.n of the Russi.n Academy of Sci.nces MoscowRussia

The dynami.s of populati.ns of small mammals of Central Si.eri. was *** studi.s were carri.d out at the Yeni.ei.ecologi.al stati.n“Mi.noye”of the *** i.sti.ute of Ecology and Evoluti.n,Russi.n Academy of *** ti.e seri.s analysi. was performed by the wavelet transform usi.g the stati.ti.al data processi.g language *** the 20th century,the dynami.s of the populati.n of the communi.y and some of i.s consti.uent speci.s(Sorex araneus;***;***;***;***;Craseomys rufocanus;Clethri.nomys ruti.us;Mi.rotus oeconomus;***)were characteri.ed by a 4-year *** type of dynami.s changed to noncycli. by the ni.eti.s,but by 2022,four speci.s(***,***,***,and ***)and the communi.y as a whole showed a tendency toward recovery of populati.n *** remai.i.g speci.s were characteri.ed by consi.tently low numbers wi.h i.regular low ampli.ude fluctuati.ns.

关键词： populati.n cycles small mammals ti.e-seri.s analysi. wavelet transform

Quantum algori.hms for matri. operati.ns and li.ear systems of equati.ns

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Communi.ati.ns i. Theoreti.al Physi.s 2024年第3期76卷 100-112页

作者： Wentao Qi.Alexandr i.Zenchuk Asutosh Kumar Junde Wu School of Mathemati.al Sci.nces Zhejiang UniversityHangzhou 310027China Federal Research Center of Problems of Chemi.al Physi.s and Medi.i.al Chemi.try RAS ChernogolovkaRussia P.G.Department of Physi.s Gaya CollegeMagadh UniversityRampurGaya 823001India Hari.h-Chandra Research i.sti.ute HBNIChhatnag RoadJhunsiPrayagraj 211019India Vai.i. and Modern Physi.s Research Centre Bhagal BhimBhinmalJalore 343029India

Fundamental matri. operati.ns and solvi.g li.ear systems of equati.ns are ubi.ui.ous i. sci.nti.i. *** the‘sender-recei.er’model,we propose quantum algori.hms for matri. operati.ns such as matri.-vector product,matri.-matri. product,the sum of two matri.es,and the calculati.n of determi.ant and i.verse *** encode the matri. entri.s i.to the probabi.i.y ampli.udes of the pure i.i.i.l states of *** applyi.g proper uni.ary transformati.n to the complete quantum system,the desi.ed result can be found i. certai. blocks of the recei.er’s densi.y *** quantum protocols can be used as subrouti.es i. other quantum ***,we present an alternati.e quantum algori.hm for solvi.g li.ear systems of equati.ns.

关键词： matri. operati.n systems of li.ear equati.ns ‘sender-recei.er’quantum computati.n model quantum algori.hm

Superexchange and charge transfer i. the ni.kelate superconductor La_(3)Ni.(2)O_(7) under pressure

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Sci.nce Chi.a(Physi.s,Mechani.s & Astronomy) 2024年第11期67卷 1-8页

作者： Wéi.Wú Zhi.ui.Luo Dao-Xi. Yao Meng Wang Center for Neutron Sci.nce and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesSchool of PhysicsSun Yat-sen UniversityGuangzhou 510275China

Recently, a bulk ni.kelate superconductor La_(3)Ni.(2)O_(7) i. di.covered at pressures wi.h a remarkable hi.h transi.i.n temperature T_(c)~ 80 K. Here, we study a Hubbard model wi.h ti.ht-bi.di.g parameters deri.ed from ab i.i.i. calculati.ns of La_(3)Ni.(2)O_(7),by employi.g large scale determi.ant quantum Monte Carlo and cellular dynami.al mean-fi.ld theory. Our result suggests that the superexchange coupli.gs i. thi. system are comparable to that of cuprates. The system i. a charge transfer i.sulator as the hole concentrati.n becomes four per si.e at large Hubbard U. Upon hole dopi.g, two low-energy spi.-si.glet bands emerge i. the system exhi.i.i.g di.ti.ct correlati.n properti.s: whi.e the one composed of the out-of-plane Ni.d_(3z^(2)-r^(2)) and O-p_(z) orbi.als demonstrates strong anti.erromagneti. correlati.ns and narrow effecti.e bandwi.th, the i.-plane si.glet band consi.ti.g of the Ni.d_(x^(2)-y^(2)) and O-p_(x)/p_(y) orbi.als i. i. general more i.i.erant. Over a broad range of hole dopi.g, the doped holes occupy pri.ari.y the d_(x^(2)-y^(2)) and p_(x)/p_(y) orbi.als, whereas the d_(3z^(2)-r^(2)) and p_(z) orbi.als retai. underdoped. We propose an effecti.e t-J model to capture the relevant physi.s and di.cuss the i.pli.ati.ns of our result for comprehendi.g the La_(3)Ni.(2)O_(7) superconducti.i.y.

关键词： superconducti.i.y ni.kelate superconductors Hubbard model superexchange charge transfer i.sulator quantum Monte Carlo

Near resonance vi.rati.n i.olati.n on a levered-dual response(LEDAR)Coulomb-damped system by di.ferenti.l preloads/offsets i. li.ear spri.gs

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Appli.d Mathemati.s and Mechani.s(Engli.h Edi.i.n) 2024年第6期45卷 1033-1050页

作者： T.i.TOLUWALOJU C.K.THEi. D.HALi. Department of Mechani.al Materials and Manufacturing EngineeringUniversity of Nottingham Ningbo ChinaNingbo 315100Zhejiang ProvinceChina Notti.gham Ni.gbo Chi.a Beacons of Excellence Research and i.novati.n i.sti.ute University of Nottingham Ningbo ChinaNingbo 315048Zhejiang ProvinceChina

The levered-dual response(LEDAR)Coulomb-damped system attai.s near resonant vi.rati.n i.olati.n by di.ferenti.l preloads/offsets i. li.ear *** takes the advantages of both the preloads/offsets i. li.ear spri.gs and the gui.erai. fri.ti.n for reali.i.g di.ferent levels of vi.rati.n *** i.olati.n capaci.i.s are i.vesti.ated on the strategi.s wi.h both the hori.ontal and verti.al gui.erai.s,wi.h the hori.ontal rai. only,and wi.hout *** compressi.e preloads generally result i. the consumpti.n of most of the i.i.i.l exci.ati.n energy so as to overcome the potenti.l *** i.olati.n onsets at the frequency rati. of 1∓0.095 on the left-hand si.e(LHS)and the ri.ht-hand si.e(RHS)of the lever are relati.e to the load plate *** observed near resonant i.olati.n thus makes the LEDAR system a candi.ate for the i.olati.n of the mechani.al systems about resonance whi.e openi.g a path for si.ultaneous harvesteri.olati.n functi.ns and passi.e functi.ns at extreme frequenci.s.

关键词： lever rati. Coulomb dampi.g preload tensi.n/compressi.n i.olati.n band/depth offset potenti.l

Opti.i.i.g Grey Wolf Opti.i.ati.n: A Novel Agents’ Posi.i.ns Updati.g Techni.ue for Enhanced Effi.i.ncy and Performance

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Open Journal of Opti.i.ati.n 2024年第1期13卷 21-30页

作者： Mahmoud Khatab Mohamed El-Gamel Ahmed i. Saleh Asmaa H. Rabi. Atallah El-Shenawy Department of Mathemati.s and Engi.eeri.g Physi.s Faculty of Engineering Mansoura University Mansoura Egypt Department of Computers and Control Faculty of Engineering Mansoura University Mansoura Egypt Department of Mathemati.s Faculty of Science New Mansoura University Mansoura Egypt

Grey Wolf Opti.i.ati.n (GWO) i. a nature-i.spi.ed metaheuri.ti. algori.hm that has gai.ed populari.y for solvi.g opti.i.ati.n problems. i. GWO, the success of the algori.hm heavi.y reli.s on the effi.i.nt updati.g of the agents’ posi.i.ns relati.e to the leader wolves. i. thi. paper, we provi.e a bri.f overvi.w of the Grey Wolf Opti.i.ati.n techni.ue and i.s si.ni.i.ance i. solvi.g complex opti.i.ati.n problems. Bui.di.g upon the foundati.n of GWO, we i.troduce a novel techni.ue for updati.g agents’ posi.i.ns, whi.h ai.s to enhance the algori.hm’s effecti.eness and effi.i.ncy. To evaluate the performance of our proposed approach, we conduct comprehensi.e experi.ents and compare the results wi.h the ori.i.al Grey Wolf Opti.i.ati.n techni.ue. Our comparati.e analysi. demonstrates that the proposed techni.ue achi.ves superi.r opti.i.ati.n outcomes. These fi.di.gs underscore the potenti.l of our approach i. addressi.g opti.i.ati.n challenges effecti.ely and effi.i.ntly, maki.g i. a valuable contri.uti.n to the fi.ld of opti.i.ati.n algori.hms.

关键词： Grey Wolf Opti.i.ati.n (GWO) Metaheuri.ti. Algori.hm Opti.i.ati.n Problems Agents’ Posi.i.ns Leader Wolves Opti.al Fi.ness Values Opti.i.ati.n Challenges