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Fir.t r.sults of tur.ulence investigation on Globus-m2 using r.dial cor.elation Doppler.r.flectometr.

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Plasma Science and Technology 2024年第10期26卷 49-55页

作者： A.POnOmAr.nKO A.YASHIn V.GUSeV e.KISeLeV G.KUr.KIeV V.mInAeV Y.PeTr.V n.SAKHAr.V P.SHCHeGOLeV e.TKACHenKO n.ZHILTSOV Peter.the Gr.at St.Peter.bur. Polytechnic Univer.ity St.Petersburg 195251Russia Ioffe Institute St.Petersburg 194064Russia

The fir.t r.sults of investigation of the tur.ulence str.ctur. using Doppler.backscatter.ng(DBS)on the Globus-m2 tokamak ar. pr.sented.A one-channel DBS system with a var.able pr.bing fr.quency within the 18–26 GHz r.nge was installed to investigate the edge plasma at nor.alized minor.r.diiρ=0.9–*** cor.elation Doppler.r.flectometr. was used to study the changes in tur.ulence eddies after.the LH *** analysis was applied to the phase der.vative of complex in-phase and quadr.tur.(IQ)signals of the DBS diagnostic as it contains infor.ation about the poloidal plasma r.tation *** L-mode,the r.dial cor.elation length L_(r.is estimated to be 3 cm and after.tr.nsition to H-mode r.duces to appr.ximately 2 *** modelling in a linear.local appr.ximation using code Gene indicates that the instability with positive gr.wth r.te at the nor.alized minor.r.diusρ=0.75 in L-mode and H-mode on Globus-m2 was the ion temper.tur. gr.dient(ITG)mode.

关键词： tokamak tur.ulence Doppler.backscatter.ng cor.elation r.flectometr.

Fuel cell stack design and modelling with a double-stage boost conver.er.coupled to a single-phase inver.er

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Clean ener.y 2024年第1期8卷 188-196页

作者： Basem e.elnagi Ahmed m.Ismaiel Hany S.e.mansour.m.n.Abd-Alwahab electr.cal engineer.ng Depar.ment Faculty of EngineeringSuez Canal UniversityIsmailia 41522Egypt

A compr.hensive pr.ton-exchange membr.ne fuel cell stack model was developed and integr.ted with a two-stage DC/DC boost *** was dir.ctly coupled to a single-phase(two levels-four.pulses)inver.er.without a *** pulse-width modu-lation signal was used to independently r.gulate ever. conver.er.*** conver.er.was modelled using a mATLAB®/Simulink®envir.nment and an appr.pr.ate voltage contr.l *** analysis featur.s of the suggested cir.uit wer. cr.ated and,thr.ugh established exper.ments,the simulation r.sults wer. ver.fied.A single-phase(two levels-four.pulses)inver.er.contr.l cir.uit was tested and it pr.duced a pur. sinusoidal wavefor. with voltage *** matches the voltage of the networ. in ter.s of amplitude and fr.quency.A sinusoidal pulse-width modulation appr.ach was per.or.ed using a single-phase(two levels-four.pulses)pulse-width modulation *** r.sults demonstr.ted an enhancement in the standar. of the output wave and tuned the dead time with a r.duction of 63μs compar.d with 180μs in conventional techniques.

关键词： Pem fuel cell pulse-width modulation single-phase inver.er.and double-stage DC/DC boost conver.er

enhancement of coer.ivity,per.eability,and dielectr.c pr.per.ies of Co_(0.2)Zn_(0.3)ni_(0.5)eu_(x)Fe_(2-x)O_(4) fer.ites for.memor. and high fr.quency devices

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Jour.al of r.r. ear.hs 2024年第6期42卷 1128-1135,I0005页

作者： I.Sar.ar.m.D.Hossain m.S.Sikder.m.n.I.Khan m.r.r.hman Physics Discipline Khulna UniversityKhulna9208Bangladesh Depar.ment of Physics Khulna University of Engineering&TechnologyKhulna9203Bangladesh Depar.ment ofComputer.Science and engineer.ng Northern University of Business&Technology KhulnaKhulna9100Bangladesh mater.al Science Division Atomic Energy CentreDhaka1000Bangladesh

Spinel cubic fer.ites have huge applications in me mor. and high fr.quency *** the impr.vement of these moder. devices,the magnetic coer.ivity,per.eability,and dielectr.c pr.per.ies of a fer.ite ar. the impor.ant *** ar.icle focuses on impr.ving the magnetic coer.ivity,magnetic per.eability,and dielectr.c pr.per.ies of Co_(0.2)Zn_(0.3)ni_(0.5)eu_(x)Fe_(2-x)O_(4) fer.ites,wher. x=0.00,0.06,and *** X-r.y diffr.ction(Xr.),Four.er.tr.nsfor. infr.r.d spectr.scopy(FTIr.,field emission scanning electr.n micr.scopy(FeSem),ener.y disper.ive X-r.y(eDX),vibr.ting sample magnetometer.VSm),and an impedance analyzer.wer. used to char.cter.ze the str.ctur.l,magnetic,and dielectr.c pr.per.ies of the *** Xr. patter.s indicate the for.ation of spinel cubic str.ctur. of the samples with a secondar. peak(euFeO_(3))for.eu doped *** densities and por.sities of the samples follow an inver.e tr.nd,wher. the doped samples’lattice par.meter. ar. incr.ased with the incr.ment of r.r. ear.h eu *** FTIr.analysis also pr.ves the spinel cubic phase of the *** aver.ge gr.in size of the fer.ites is obtained via FeSem images,and it is incr.ased fr.m 121 to 198 *** analysis confir.s that doping of the eu content also changes other.hyster.sis loop pr.per.ies of Co_(0.2)Zn_(0.3)ni_(0.5)eu_(x)Fe_(2-x)O_(4) ***,the coer.ivity of the eu doped samples is gr.ater.than that of the mother.alloy(x=0.00).The eDX study shows that ther. is no impur.ty contamination in the *** per.eability and dielectr.c measur.ments show an impr.ved quality factor.of the eu-doped samples with low magnetic and dielectr.c *** dependent r.sistivity and impedance analysis also show the impr.ved *** the obser.ed pr.per.ies of the samples,all the investigated fer.ites might be str.ng candidates for.potential applications in memor. devices,magnetic sensor.,and high fr.quency applications.

关键词： Fer.ites r.r.e ar.hs Coer.ivity Per.eability eDX r.sistivity

Fir.t-pr.nciples calculations to investigate str.ctur.l,electr.nic,magnetic,optical and ther.odynamic pr.per.ies of r._(2)r._(3)Ge(r.=Pr.Sm)

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Jour.al of r.r. ear.hs 2024年第7期42卷 1385-1393,I0007页

作者： A.ezaier.r.masr.ur.m.Hamedoun J.Khar.ach A.r.zzouk A.Hour.atallah n.Benzakour.K.Bouslykhane Labor.tor. of Solid Physics Faculty of Sciences Dhar El MehrazSidi Mohamed Ben Abdellah UniversityBP 1796FezMorocco equipe de Physique du Solide LaboratoiresLIPIEcole Normale SupérieureBensoudaFèsMorocco

In this paper.we analyzed the physical char.cter.stics of the ter.ar. alloys r._(2)r._(3)Ge(r.=Pr.and Sm)using the fir.t pr.nciples calculation based on functional density theor. integr.ted in the Wien2k *** calculated for.ation ener.ies of Pr.(2)r._(3)Ge and Sm_(2)r._(3)Ge ar.−5.3827 and−5.2782 eV/atom,r.spectively,showing that these alloys may exist *** r.sults of the band str.ctur. and density of states indicate that all of the compounds tested ar. magnetic metals,and their.magnetism is mostly r.lated to the contr.bution of Pr.and Sm *** total magnetic moments of Pr.(2)r._(3)Ge and Sm_(2)r._(3)Ge ar. 4.07245 and 11.16161μB/f.u,*** par.meter. such as heat capacity at constant pr.ssur.,entr.py,Debye temper.tur.,lattice volume,compr.ssibility coefficients,and Gr.neisen par.meter.alloys wer. calculated using the Gibbs algor.thm and studied in depth over.a lar.e temper.tur. r.nge of 0-900 *** Debye temper.tur. incr.ases with incr.asing pr.ssur. and decr.ases with decr.asing ***,the Debye temper.tur.s calculated at p=0 GPa and T=300 K ar. equal to be 342 and 322 K for.Pr.(2)r._(3)Ge and Sm_(2)r._(3)Ge,*** optical char.cter.stics such as the r.al and imaginar. por.ions of the dielectr.c function,the absor.tion coefficient,the ener.y-loss function,and the r.fr.ctive index wer. investigated and discussed in mor. depth.

关键词： magnetic metals Functional density theor. Density of states magnetic moment Optical and ther.odynamic pr.per.ies r.r. ear.hs

Phaner.zoic co-evolution of O2-CO2 and ocean habitability

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national Science r.view 2024年第6期11卷 18-21页

作者： Zunli Lu r.salind e.m.r.ckaby Jonathan L.Payne Ashley n.Pr.w Depar.ment of ear.h & envir.nmental Sciences Syracuse University Depar.ment of ear.h Sciences University of Oxford Depar.ment of ear.h and Planetar. Sciences Stanford University

Atmospher.c car.on dioxide and oxygen concentr.tions ar. par.ially linked via the geological cycle of or.anic car.on （Fig. 1A–C; e.g. CO2+H2O■CH2O+O2）. The histor. of these two biologically active components, contr.ls on their.concentr.tions, and implications for.the complexity of the biospher. and habitability of ear.h have been hotly debated, but ar. gener.lly consider.d independently.

关键词： CO2-COnCenTr.TInG meCHAnISm OXYGen eVOLUTIOn AnOXIA

r.C aggr.gation,defor.ation and adhesion to endothelium:r.le of nitr.c oxide der.ved fr.m L-Ar.inine and sodium nitr.pr.sside

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Jour.al of Innovative Optical Health Sciences 2024年第5期17卷 53-65页

作者： m.K.maksimov P.B.er.olinskiy O.n.Scheglovitova n.n.Sklyankina A.V.mur.vyov A.e.Lugovtsov A.V.Pr.ezzhev Faculty of Physics M.V.Lomonosov Moscow State University bld.1subbuilding.2Leninskie goryMoscow 11991Russia n.F.Gamaleya national r.sear.h Center.for.epidemiology and micr.biology 18 Gamaleya StreetMoscow 123098Russia K.D.Ushinsky Yar.slavl State Pedagogical Univer.ity 108/1 Respublikanskaya StreetYaroslavl 150000Russia

r.d blood cells(r.Cs)ar. the most abundant human blood *** aggr.gation and defor.ation str.ngly deter.ine blood viscosity which impacts hemor.eology and *** tur.,r.C pr.per.ies depend on di®er.nt endogenous and exogenous *** such factor.is nitr.c oxide(nO),which is mainly pr.duced by endothelial cells(eC)fr.m L-ar.inine amino acid in the cir.ulator. *** the mechanisms of the r.C-endothelium inter.lay ar. not clear.up to date and consider.ng its possible clinical impor.ance,the aims of this study ar. to investigate in vitr.:(1)The e®ect of L-ar.inine induced nO on r.C aggr.gation and adhesion to endothelium;(2)the nO e®ect on r.C aggr.gation and defor.ation induced by L-ar.inine and sodium nitr.pr.sside without the pr.sence of endothelium in the *** r.C aggr.gation and adhesion to a monolayer.of eC wer. studied using optical tweezer.(OT).The r.C defor.ability and aggr.gation without endothelium in the samples wer. studied using the°ow chamber.method and myr.nne *** con¯r.ed that nO incr.ases defor.ability and decr.ases aggr.gation of *** showed that the soluble guanylate cyclase pathway appear. to be the only nO signaling pathway *** the samples with the endothelium,the\bell-shaped"dependence of r.C aggr.gation for.e on L-ar.inine concentr.tion was obser.ed,which impr.ves our.knowledge about the pr.cess of nO pr.duction by ***,data r.lated to L-ar.inine accumulation by endothelium wer. obtained:necessity of the pr.sence of extr.cellular.L-ar.inine stated by other.author. was put under.*** our.study,nO decr.ased the r.C-endothelium adhesion,however.the tendency appear.d to be weak and was not con¯r.ed in another.set of *** our.knowledge,this is the¯r.t attempt to measur. the for.es of r.C adhesion to endothelium monolayer.with OT.

关键词： r.d blood cells aggr.gation L-ar.inine endothelium optical tweezer. myr.nne flow chamber

Fr.eze-thaw cycles and associated geomor.hology in a post-glacial envir.nment:cur.ent glacial,par.glacial,per.glacial and pr.glacial scenar.os at Pico de Or.zaba volcano,mexico

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Jour.al of mountain Science 2024年第6期21卷 1954-1977页

作者： Víctor.SOTO Car.os m.WeLSH r. Kenji YOSHIKAWA Hugo DeLGADO Gr.nADOS Centr. de Ciencias de la Tier.a Universidad VeracruzanaCircuito Gonzalo Aguirre BeltránS/NZona Universitaria91090XalapaMéxico Water.and envir.nmental r.sear.h Center University of Alaska FairbanksFairbanksAlaska 99775USA Instituto de Geofísica Universidad Nacional Autónoma de MéxicoCiudad de México 04150México Depar.ment of ear.h and envir.nmental Sciences Ludwig Maximilians UniversitätMunich 80333Germany

The glacial histor. of Pico de Or.zaba indicates that dur.ng the Last Glacial maximum,its icecap cover.d up to~3000 m asl;due to the air.temper.tur. incr.asing,its main glacier.has r.tr.ated to 5050 m *** r.tr.ction of the glacier.has left behind an intense climatic instability that causes a high fr.quency of fr.eze-thaw cycles of gr.at intensity;the r.sulting geomor.hological pr.cesses ar. r.pr.sented by the fr.gmentation of the bedr.ck that occupies the upper.par.s of the *** is a notable lack of studies r.gar.ing the fr.gmentation and er.sion occur.ing in tr.pical high mountains,and the associated geomor.hological r.sks;for.this r.ason,as a fir.t stage of futur. continuous r.sear.h,this study analyzes the fr.ezing and thawing cycles that occur.above 4000 m asl,thr.ugh continuous monitor.ng of sur.ace gr.und *** r.sults allow us to identify and char.cter.ze four.zones:glacial,par.glacial,per.glacial and *** was found that the par.glacial zone pr.sents an intense dr.p of temper.tur.,of up to~9℃ in only sixty *** r.ck fatigue and intense fr.eze-thaw cycles that occur.in this ar.a ar. r.sponsible for.the high r.te of r.ck disintegr.tion and r.pr.sent the main factor.of the constant slope dynamics that occur.at the *** activity decr.ases,both in fr.quency and intensity,accor.ing to the distance to the glacier.which is wher. the temper.tur. pr.sents a cer.ain degr.e of stability,until r.aching the pr.glacial zone,wher. cycles ar. almost non-existent,and ther.for. ther. is no gelifr.ction *** geomor.hological pr.cesses have r.sulted in significant alter.tions to the mountain slopes,which can have sever. consequences in ter.s of r.sk and water.

关键词： Fr.eze-Thaw Gelifr.ction mountain mechanical er.sion Per.glacial geomor.hology Postglacial scenar.os

Discover. of two long-per.od pulsar. associated the globular.cluster.m15

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Science China(Physics,mechanics & Astr.nomy) 2024年第6期67卷 184-184页

作者： r.n.manchester Austr.lia Telescope national Facility CSIRO Space and AstronomyEpping NSW 1710Australia

With their.huge number.of star.,many of which ar. member. of binar. systems,globular.cluster. pr.vide a r.ch sour.e of pulsar.*** in binar. systems will evolve,often spinning up or.r.cycling”the pulsar.thr.ugh accr.... 详细信息

关键词： accr.tion star. sour.e

magnetic,dielectr.c and electr.cal modulus of Ce^(3+) doped cobalt-magnesium fer.ite nanopar.icles

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Jour.al of r.r. ear.hs 2024年第2期42卷 373-382,I0005页

作者： n.m.Basfer.Hanaa Almaghamsi Depar.ment of Physics Umm AL-Qura UniversityMakkahSaudi Arabia Physics Depar.ment College of Science and ArtKing Abdulaziz UniversityPOB344Rabigh291Saudi Arabi

In this wor.,the magnetic,dielectr.c pr.per.ies and electr.c modulus of Ce^(3+) substituted cobaltmagnesium(Co_(0.7)mg_(0.3)Ce_(x)Fe_(2-x)O_4)(labeled as CmCF) fer.ite nanopar.icles wer. investigated in *** magnetization decr.ases fr.m 50.05 to 34.87 emu/g for.fur.her.substituting Ce^(3+) ***,coer.ivity incr.ases fr.m 738.22 Gs for.the CmCFO sample to 912.10 Gs for.the CmCF2 sample,then decr.ases monotonically to 762.1 Gs for.the CmCF5 *** cer.um content and par.icle size play impor.ant r.les in contr.lling the magnetization and coer.ivity of the CmCF *** CmCF nanofer.ites ar. suitable for.micr.wave applications since their.high-fr.quency r.sponse r.nges fr.m 7.72 to 11.07 *** CmCF nanofer.ites' dielectr.c par.meter.disper.ion exhibits nor.al *** pr.stine Co-mg nanofer.ite only has ε' value of 28.25,but the nanofer.ite mCmF2 has ε' value of365.03,with an enhancing r.tio of 1192%.The conduction mechanism of the mCmF nanofer.ites was deter.ined by fitting the σ_(ac) r.sults via the Jonscher.power.*** 653 K,lar.e polar.n tunnelling is thought to be r.sponsible for.this conduction pr.cess,which is followed by electr.n bar.ier.hopping at higher.***-Cole diagr.ms at differ.nt temper.tur.s,assur.ng the contr.butions of the gr.ins and their.boundar.es at lower.temper.tur.s(653 K) and only the gr.ins at higher.*** on our.r.sults,the CmCF nanofer.ites hold magnetic and semiconducting natur.,which can be used in magnetic devices and dielectr.cs in lower.fr.quencies or.conductor. in higher.fr.quencies.

关键词： nanofer.ites r.r. ear.h ions magnetic pr.per.ies Dielectr.c par.meter. Impedance spectr.scopy