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Schisanhenol ameliorates non-alcoholic fatty liver disease via inhibiting mir-802 activation of AmPK-mediated modulation of hepatic lipid metabolism

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Acta Pharmaceutica Sinica B 2024年第9期14卷 3949-3963页

作者： li B. xiao Q. zhao h. zhang j. yang c. zou y. zhang B. liu j. Sun h. liu h. State Key laboratory of Bioactive Substance and function of Natural medicines Institute of Medicinal Plant Development Chinese Academy of Medical Sciences Peking Union Medical College Beijing 100193 China Institute of Basic medical Sciences Chinese Academy of Medical Sciences Department of Pathophysiology Peking Union Medical College Beijing 100005 China

Non-alcoholic fatty liver disease (NAflD), characterized by hepatic steatosis, is a common metabolic liver disease worldwide. currently, satisfactory drugs for NAflD treatment remain lacking. obesity and diabetes are the leading causes of NAflD, and compounds with anti-obesity and anti-diabetic activities are considered suitable candidates for treating NAflD. In this study, biochemical and histological assays revealed that a natural lignan schisanhenol (SAl) effectively decreased lipid accumulation and improved hepatic steatosis in free fatty acid (ffA)-treated hepG2 cells and high-fat diet (hfD)-induced NAflD mice. further, molecular analyses, microrNA (mirNA)-seq, and bioinformatics analyses revealed that SAl may improve NAflD by targeting the mir-802/adenosine monophosphate-activated protein kinase (AmPK) pathway. liver-specific overexpression of mir-802 in NAflD mice significantly impaired SAl-mediated liver protection and decreased the protein levels of phosphorylated (p)-AmPK and PrKAB1. Dual-luciferase assay analysis further confirmed that mir-802 inhibits hepatic AmPK expression by binding to the 3' untranslated region of mouse Prkab1 or human PrKAA1. Additionally, genetic silencing of PrKAA1 blocked SAl-induced AmPK pathway activation in ffA-treated hepG2 cells. The results demonstrate that SAl is an effective drug candidate for treating NAflD through regulating mir-802/AmPK-mediated lipid metabolism. © 2024 The Authors

关键词： AmPK hepatic steatosis lipid metabolism mir-802 Non-alcoholic fatty liver disease PPArα Schisanhenol SrEBP-1c

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lhAASo观测发现w51区域粒子能量加速至PeV的证据（英文）

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Science Bulletin 2024年第18期 2833-2841页

作者： zhen cao f.Aharonian Axikegu y.x.Bai y.w.Bao D.Bastieri x.j.Bi y.j.Bi w.Bian A.V.Bukevich Q.cao w.y.cao zhe cao j.chang j.f.chang A.m.chen E.S.chen h.x.chen liang chen lin chen long chen m.j.chen m.l.chen Q.h.chen S.chen S.h.chen S.z.chen T.l.chen y.chen N.cheng y.D.cheng m.y.cui S.w.cui x.h.cui y.D.cui B.z.Dai h.l.Dai z.G.Dai Danzengluobu x.Q.Dong K.K.Duan j.h.fan y.z.fan j.fang j.h.fang Kun fang c.f.feng h.feng l.feng S.h.feng x.T.feng y.feng y.l.feng S.Gabici B.Gao c.D.Gao Q.Gao w.Gao w.K.Gao m.m.Ge l.S.Geng G.Giacinti G.h.Gong Q.B.Gou m.h.Gu f.l.Guo x.l.Guo y.Q.Guo y.y.Guo y.A.han m.hasan h.h.he h.N.he j.y.he y.he y.K.hor B.w.hou c.hou x.hou h.B.hu Q.hu S.c.hu D.h.huang T.Q.huang w.j.huang x.T.huang x.y.huang y.huang x.l.ji h.y.jia K.jia K.jiang x.w.jiang z.j.jiang m.jin m.m.Kang I.Karpikov D.Kuleshov K.Kurinov B.B.li c.m.li cheng li cong li D.li f.li h.B.li h.c.li jian li jie li K.li S.D.li w.l.li w.l.li x.r.li xin li y.z.li zhe li zhuo li E.w.liang y.f.liang S.j.lin B.liu cheng liu D.liu D.B.liu h.liu h.D.liu j.liu j.l.liu m.y.liu r.y.liu S.m.liu w.liu y.liu y.N.liu Q.luo y.luo h.K.lv B.Q.ma l.l.ma x.h.ma j.r.mao z.min w.mitthumsiri h.j.mu y.c.Nan A.Neronov l.j.ou P.Pattarakijwanich z.y.Pei j.c.Qi m.y.Qi B.Q.Qiao j.j.Qin A.raza D.ruffolo A.Sáz m.Saeed D.Semikoz l.Shao o.Shchegolev x.D.Sheng f.w.Shu h.c.Song yu.V.Stenkin V.Stepanov y.Su D.x.Sun Q.N.Sun x.N.Sun z.B.Sun j.Takata P.h.T.Tam Q.w.Tang r.Tang z.B.Tang w.w.Tian c.wang c.B.wang G.w.wang h.G.wang h.h.wang j.c.wang Kai wang Kai wang l.P.wang l.y.wang P.h.wang r.wang w.wang x.G.wang x.y.wang y.wang y.D.wang y.j.wang z.h.wang z.x.wang zhen wang zheng wang D.m.wei j.j.wei y.j.wei T.wen c.y.wu h.r.wu Q.w.wu S.wu x.f.wu y.S.wu S.Q.xi j.xia G.m.xiang D.x.xiao G.xiao y.l.xin y.xing D.r.xiong z.xiong D.l.xu r.f.xu r.x.xu w.l.xu l.xue D.h.yan j.z.yan T.yan c.w.y.ng.c.y.y.ng.f.y.ng.f.f.y.ng.l.l.y.ng.m.j.y.ng.r.z.y.ng.w.x.y.ng.y.h.y.o z.G.yao l.Q.yin N.yin x.h.you z.y.you y.h.yu Q.yuan h.yue h.D.zeng T.x.zeng w.zeng m.zha B.B.zhang f.zhang h.zhang h.m.zhang h.y.z lhAASo合作组 Key laboratory of Particle Astrophysics & Experimental Physics Division & computing center Institute of high Energy Physics chinese Academy of Sciences University of chinese Academy of Sciences TIANfU cosmic ray research center Dublin Institute for Advanced Studies max-Planck-Institut for Nuclear Physics School of Physical Science and Technology & School of Information Science and Technology Southwest jiaotong University School of Astronomy and Space Science Nanjing University center for Astrophysics Guangzhou University Tsung-Dao lee Institute & School of Physics and Astronomy Shanghai jiao Tong University Institute for Nuclear research of russian Academy of Sciences hebei Normal University University of Science and Technology of china State Key laboratory of Particle Detection and Electronics china Key laboratory of Dark matter and Space Astronomy & Key laboratory of radio Astronomy Purple mountain observatory chinese Academy of Sciences research center for Astronomical computing zhejiang laboratory Key laboratory for research in Galaxies and cosmology Shanghai Astronomical observatory chinese Academy of Sciences School of Physics and Astronomy yunnan University Key laboratory of cosmic rays (Tibet University) ministry of Education National Astronomical observatories chinese Academy of Sciences School of Physics and Astronomy (zhuhai) & School of Physics(Guangzhou) & Sino-french Institute of Nuclear Engineering and Technology (zhuhai) Sun yat-sen University Institute of frontier and Interdisciplinary Science Shandong University APc UniversitéParis cité cNrS/IN2P3 cEA/IrfU observatoire de Paris Department of Engineering Physics Tsinghua University School of Physics and microelectronics zhengzhou University yunnan observatories chinese Academy of Sciences china center of Advanced Science and Technology college of Physics Sichuan University School of Physics Peking University Guangxi Key laboratory for relativistic Astrophysics School of Physical Science and Technology Guangxi University Department of Ph

The γ-ray emission from the w51 complex is widely acknowledged to be attributed to the interaction between the cosmic rays （crs） accelerated by the shock of supernova remnant （SNr） w51c and the dense molecular clouds in the adjacent star-forming region,***,the maximum acceleration capability of w51c for crs remains *** on observations conducted with the large high Altitude Air Shower observatory （lhAASo）,we report a significant detection of γ rays emanating from the w51 complex,with energies from 2 to 200 *** lhAASo measurements,for the first time,extend the γ-ray emission from the w51 complex beyond 100 TeV and reveal a significant spectrum bending at tens of *** combining the"π0-decay bump"featured data from fermi-lAT,the broadband γ-ray spectrum of the w51 region can be well-characterized by a simple pp-collision *** observed spectral bending feature suggests an exponential cutoff at～400 TeV or a power-law break at～200 TeV in the cr proton spectrum,most likely providing the first evidence of SNrs serving as cr accelerators approaching the PeV ***,two young star clusters within w51B could also be theoretically viable to produce the most energetic γ rays observed by *** findings strongly support the presence of extreme cr accelerators within the w51 complex and provide new insights into the origin of Galactic crs.

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Ab initio valence-space in-medium similarity renormalization group calculations for neutron-rich P,cl,and K isotopes

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chinese Physics c 2024年第7期48卷 181-190页

作者：谢萌冉沈留媛李健国李红蕙袁琪左维 Institute of modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

Neutron-rich P,cl,and K isotopes,particularly those with neutron numbers of approximately N=28,have attracted extensive experimental and theoretical *** utilize the ab initio valence-space in-medium similarity renormalization group approach,based on chiral nucleon-nucleon and three-nucleon forces,to investigate the exotic properties of these *** calculations of the low-lying spectra are performed.A key finding is the level inversion between 3/2_(1)^(+)and 1/2_(1)^(+)states in odd-A isotopes,attributed to the inversion ofπ0xod_(3/2) andπls_(1/2) single-particle *** ab initio calculations,which incorporate the three-nucleon forces,correlate closely with existing experimental *** calculations of effective proton single-particle energies provide deeper insights into the shell evolution for z=14 and 16 *** results indicate that the three-body force plays important roles in the shell evolution for z=14 and 16 sub-shells with neutron numbers ranging from 20 to ***,systematic ab initio calculations are conducted for the low-lying spectra of odd-odd *** results correspond with experimental data and provide new insights for future research into these isotopes up to and beyond the drip line.

关键词： ab initio calculations shell evolution low-lying spectra

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Development of Extraction and Detection method for a chemotherapeutic Drug with Phenytoin in Biological Samples

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Advances in Biological chemistry 2024年第4期14卷 103-110页

作者： michael Arnot Nicolas Brice Adan Garcia Victor lomeli my Phuong Vu Karno ng Department of chemistry & Biochemistry California State University San Marcos San Marcos CA U.S.A.

Dexamethasone is classified as a corticosteroid and is commonly used among cancer patients to decrease the amount of swelling around the tumor. Among patients with cancer, in particular brain tumors, seizures can become a daily routine in their everyday lives. To counteract the seizures, an antiepileptic drug such as phenytoin is administered to act as an anticonvulsant. Phenytoin and dexamethasone are frequently administrated concurrently to brain cancer patients. A previous study has shown that phenytoin serum concentration decreases when administrated concurrently with dexamethasone. Thus, it is important to monitor the concentration of these two drugs in biological samples to ensure that the proper dosages are administrated to the patients. This study aims to develop an effective extraction and detection method for dexamethasone and phenytoin. A reverse-phase high-performance liquid chromatography (hPlc) method with UV/Vis detection has been developed to separate phenytoin and dexamethasone at 219 nm and 241 nm respectively from urine samples. The mobile phase consists of a mixture of 0.01 m Kh2Po4, acetonitrile, and methanol adjusted to ph 5.6 (48:32:20) and is pumped at a flow rate of 1.0 ml/min. calibration curves were prepared for phenytoin and dexamethasone (r2 > 0.99). An efficient solid-phase extraction (SPE) method for the extraction of dexamethasone and phenytoin from urine samples was developed with the use of c-18 cartridges. The percent recovery for phenytoin and dexamethasone is 95.4% (rSD = 1.15%) and 81.1% (rSD = 3.56%) respectively.

关键词： Dexamethasone Phenytoin cancer Drug Interaction Solid Phase Extraction

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The Soft x-ray Imager(SxI)on the SmIlE mission

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Earth and Planetary Physics 2024年第1期8卷 5-14页

作者： S.Sembay A.l.Alme D.Agnolon T.Arnold A.Beardmore A.Belén Balado margeli c.Bicknell c.Bouldin G.Branduardi-raymont T.crawford j.P.Breuer T.Buggey G.Butcher r.canchal j.A.carter A.cheney y.collado-Vega h.connor T.crawford N.Eaton c.feldman c.forsyth T.frantzen G.Galgóczi j.Garcia G.y.Genov c.Gordillo h-P.Gröbelbauer m.Guedel y.Guo m.hailey D.hall r.hampson j.hasiba o.hetherington A.holland S-y.hsieh m.w.j.hubbard h.jeszenszky m.jones T.Kennedy K.Koch-mehrin S.Kögl S.Krucker K.D.Kuntz c.lakin G.laky o.lylund A.martindale j.miguel mas hesse r.Nakamura K.oksavik N.Østgaard h.ottacher r.ottensamer c.Pagani S.Parsons P.Patel j.Pearson G.Peikert f.S.Porter T.Pouliantis B.h.Qureshi w.raab G.randal A.m.read N.m.m.roque m.E.rostad c.runciman S.Sachdev A.Samsonov m.Soman D.Sibeck S.Smit j.Søndergaard r.Speight S.Stavland m.Steller Tianran Sun j.Thornhill w.Thomas K.Ullaland B.walsh D.walton c.wang S.yang School of Physics and Astronomy University of LeicesterLeicesterLE17RHUK Space Park leicester University of LeicesterLeicesterLE17RHUK mullard Space Science laboratory University College LondonDorkingRH56NTUK centre for Electronic Imaging Open UniversityMilton KeynesMK76 AAUK Birkeland centre for Space Science Department of Physics and TechnologyUniv.of BergenN-5007 BergenNorway University of Vienna A-1010 ViennaAustria Space research Institute Austrian Academy of SciencesA-8042 GrazAustria National Institute of Aerospace Technology MadridSpain ESTEc European Space Agency2201 AZ NoordwijkNetherlands State Key laboratory of Space weather National Space Science CentreBeijing 100190China University of Applied Sciences and Arts Northwestern Switzerland CH-5210 WindischSwitzerland Koegl Space Gmbh CH-8157 DielsdorfSwitzerland Space Acoustics Gmbh CH-8157 DielsdorfSwitzerland zurich University of Applied Sciences 8400 WinterhurSwitzerland Genov Solutions N-5172 LoddefjordNorway STm Engineering N-5165 LaksevagNorway john hopkins University Applied Physics laboratory MD 20723USA NASA/Goddard Space flight centre MD 20771USA center for Space Physics Boston UniversityBostonMA 02215USA Department of Theoretical Physics and Astrophysics Masaryk University60177 BrnoCzech Republic Institute of Physics E¨otvo¨s Lor´and University1053 BudapestHungary Aerospace Information research Institute Chinese Academy of SciencesBeijing 100045China centro de Astrobiologia(cAB) CSIC-INTAMadridSpain

The Soft x-ray Imager(SxI)is part of the scientific payload of the Solar wind magnetosphere Ionosphere link Explorer(SmIlE)*** is a joint science mission between the European Space Agency(ESA)and the chinese Academy of Sciences(cAS)and is due for launch in *** is a compact x-ray telescope with a wide field-of-view(foV)capable of encompassing large portions of Earth’s magnetosphere from the vantage point of the SmIlE *** is sensitive to the soft x-rays produced by the Solar wind charge exchange(Swcx)process produced when heavy ions of solar wind origin interact with neutral particles in Earth’s *** provides a mechanism for boundary detection within the magnetosphere,such as the position of Earth’s magnetopause,because the solar wind heavy ions have a very low density in regions of closed magnetic field *** sensitivity of the SxI is such that it can potentially track movements of the magnetopause on timescales of a few minutes and the orbit of SmIlE will enable such movements to be tracked for segments lasting many *** is led by the University of leicester in the United Kingdom(UK)with collaborating organisations on hardware,software and science support within the UK,Europe,china and the United States.

关键词： Soft x-ray Imaging micropore optics large area ccD

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Synthesis,Structures,and chiroptical Properties of NBN-Doped helicenes with Boron Atoms in the Inner rims

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Precision chemistry 2024年第1期2卷 28-39页

作者： weiwen zhuang yujian liu ziqi Deng yu Guo Philip c.y.chow David lee Phillips wei jiang zhaohui wang junzhi liu State Key laboratory of Synthetic chemistry HKU-CAS Joint Laboratory on New Materials and Department of ChemistryThe University of Hong KongPokfulamHong KongChina Key laboratory of organic optoelectronics and molecular Engineering Department of ChemistryTsinghua UniversityBeijing 100084China Department of mechanical Engineering The University of Hong KongPokfulamHong KongChina

The precise synthesis of helicenes with topologically defined length and specific heteroatomic perturbation in the screw-like conjugated skeletons plays an emerging role in the manipulation of chiral ***,selective,and programmable routes to helicenes or heterohelicenes are highly desirable yet challenging for structure-chiroptical property relationship ***,we report the synthesis and characterization of NBN-doped helicenes with boron atoms in the inner rims,enabled by the highly regioselective one-pot borylation of rationally designed precursors with,namely,fold-in or pan-out *** incorporation of nonbonded boron and nitrogen atoms resulted in narrow-band emission and improved optical properties for the single-stranded carbon *** addition,numbers and arrangement modes of fused six-membered rings have distinct effects on configurational stability and chiroptical properties,revealing that BN-[6]h with strong circular dichroism is a promising candidate for chiral *** combination of experimental and theoretical studies on these helical structures might provide insights into the design of helically chiral small-molecule-based sensors or emitters.

关键词： Nitrogen-boron helicenes Borylation chiroptical properties Narrow-band emission

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Ground-based and additional science support for SmIlE

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Earth and Planetary Physics 2024年第1期8卷 275-298页

作者： j.A.carter m.Dunlop c.forsyth K.oksavik E.Donovon A.Kavanagh S.E.milan T.Sergienko r.c.fear D.G.Sibeck m.connors T.yeoman x.Tan m.G.G.T.Taylor K.mcwilliams j.Gjerloev r.Barnes D.D.Billet G.chisham A.Dimmock m.P.freeman D.-S.han m.D.hartinger S.-y.w.hsieh z.-j.hu m.K.james l.juusola K.Kauristie E.A.Kronberg m.lester j.manuel j.matzka I.mccrea y.miyoshi j.rae l.ren f.Sigernes E.Spanswick K.Sterne A.Steuwer T.Sun m.-T.walach B.walsh c.wang j.weygand j.wild j.yan j.zhang Q.-h.zhang Planetary Sciences Group School of Physics and AstronomyUniversity of LeicesterUniversity RoadLeicesterLE17RHUK rutherford Appleton laboratory Space Science Technology Facilities CouncilOxfordshireUK School of Space and Environment Beihang UniversityBeijing 100191China Key laboratory of Space Environment monitoring and Information Processing Ministry of Industry and Information TechnologyBeijing 100017China Department of Space and climate Physics UCLMullard Space Science LaboratoryHolmbury St.MaryDorkingSurreyRH56NTUK Birkeland centre for Space Science Department of Physics and Technology.University of BergenBergenNorway Department of Physics and Astronomy University of Calgary2500 University DriveCalgaryAlbertaCanada T2N 1N4 British Antarctic Survey CambridgeUK Swedish Institute of Space Physics KirunaSweden west highfield campus University of SouthamptonUniversity RoadSO171BJUK Goddard Space flight center NASAGreenbeltMarylandUSA Athabasca University AthabascaCanada ESTEc European Space AgencyNetherlands University of Saskatchewan SaskatoonCanada The johns hopkins University Applied Physics laboratory LaurelMarylandUSA Swedish Institude of Space Physics UppsalaSE 75121Sweden Tongji University Shanghai 200092China center for Space Plasma Physics Space Science Institute4765 Walnut Street Suite BBoulderColorado80301USA Polar research Institute of china Shanghai 200136China finnish meteorological Institute(fmI) Finland Department of Earth and Environmental Sciences(Geophysics) Ludwig Maximilian University of Munich(LMU)MunichTheresienstr.41MunichD-80333Germany canadian Space Agency MontrealCanada Gfz German research centre for Geosciences PotsdamGermany Nagoya University Institute for Space Earth Environment ResearchCenter for Integrated Data ScienceNagoyaAichiJP 464-8601 Northumbria University Newcastle upon TyneTyne and WearUK NE18ST National Space Science center Chinese Academy SciencesBeijing 100190China Arctic Geophysics University Centre in Svalbard

The joint European Space Agency and chinese Academy of Sciences Solar wind magnetosphere Ionosphere link Explorer(SmIlE)mission will explore global dynamics of the magnetosphere under varying solar wind and interplanetary magnetic field conditions,and simultaneously monitor the auroral response of the Northern hemisphere *** these large-scale responses with medium and fine-scale measurements at a variety of cadences by additional ground-based and space-based instruments will enable a much greater scientific impact beyond the original goals of the SmIlE ***,we describe current community efforts to prepare for SmIlE,and the benefits and context various experiments that have explicitly expressed support for SmIlE can offer.A dedicated group of international scientists representing many different experiment types and geographical locations,the Ground-based and Additional Science working Group,is facilitating these *** include constructing an online SmIlE Data fusion facility,the discussion of particular or special modes for experiments such as coherent and incoherent scatter radar,and the consideration of particular observing strategies and spacecraft *** anticipate growing interest and community engagement with the SmIlE mission,and we welcome novel ideas and insights from the solar-terrestrial community.

关键词： magnetosphere ionosphere magnetosphere-ionosphere coupling ground-based experimentation SmIlE conjunctions missions

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Simple and high-yield Synthesis of a Thinner layer of Graphenic carbon from coconut Shells

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journal of renewable materials 2024年第5期12卷 969-979页

作者： retno Asih haniffudin Nurdiansah mochamad zainuri Deni S.Khaerudini Angelinus T.Setiawan A.y.Dias Pudji Untoro Ahmad Sholihand Darminto Department of Physics Institut Teknologi Sepuluh NopemberSurabaya60111Indonesia Department of material and metallurgical Engineering Institut Teknologi Sepuluh NopemberSurabaya60111Indonesia research centre for Advanced materials National Research and Innovation Agency(BRIN)Tangerang Selatan15314Indonesia PT.Graphene Nanomaterial consulting Malang65141Indonesia Department of Physical Engineering Surya UniversityBanten15143Indonesia

Biomass has become of recent interest as a raw material for‘green’graphenic carbon(Gc)since it promotes an environmentally friendly ***,we investigate a single pyrolysis route to synthesize Gc from coconut shells which provides a simple method and can produce a high yield,thus being convenient for large-scale *** pyrolysis involves a stepped holding process at 350℃ for 1 h and at 650℃ or 900℃ for 3 *** Gc sample resulted at the 900℃ pyrolysis has a thinner sheet,a less porous structure,a higher c/o ratio,and an enhanced electrical conductivity than those pyrolyzed at 650℃.The addition of Na3Po4 catalyst has no signiﬁ-cant effects on the Gc structures obtained by this *** single pyrolysis route generates thinner Gc sheets compared to the two-step heat treatment followed by the liquid phase exfoliation(lPE)***,the latter method offers a formation of clean samples with a porous or holey feature which has potential for advanced energy-storage applications.

关键词： Graphenic carbon biomass coconut shells pyrolysis synthesis route

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zinc-oxide/PDmS-clad tapered fiber saturable absorber for passively mode-locked erbium-doped fiber laser

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chinese Physics B 2021年第5期30卷 384-389页

作者： f D muhammad S A S husin E K ng K y lau c A c Abdullah m A mahdi Department of Physics Faculty of ScienceUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia wireless and Photonics Networks research centre Faculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Electronics and Nanoengineering Tietotie 3Aalto University02150 EspooFinland

we propose and demonstrate a passively mode-locked erbium-doped fiber laser(EDfl)based on zinc-oxide/polydimethylsiloxane(zno/PDmS)saturable absorber(SA)that evanescently interacts with the light on a tapered *** zno/PDmS composite is coated on the whole surface of the tapered fiber to guarantee the maximum efficiency of the SA device,with a measured insertion loss of 0.87 dB and a modulation depth of 6.4%.The proposed laser can generate soliton mode-locking operation at a threshold power of 33.07 *** generated output pulse yields a repetition rate and pulse width of 9.77 mhz and 1.03 ps,*** results indicate that the proposed zno/PDmS-clad tapered fiber could be useful as an efficient,compatible,and low-cost SA device for ultrafast laser applications.

关键词： zinc-oxide saturable absorber tapered fiber mode-locked fiber laser

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co-substitution of zirconium and neodymium on hyperfine interactions and Ac susceptibility of Srfe12o19 nanohexaferrites

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journal of rare Earths 2020年第3期38卷 265-273页

作者： m.A.Almessere y.Slimani h.Güngünes A.Baykal Department of Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 198231441DammamSaudi Arabia Department of Biophysics Institute for Research&Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441DammamSaudi Arabia Department of Physics Hitit University19030Cevre Yolu Bulvan-CorumTurkey Department of Nano-medicine research Institute for Research&Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441DammamSaudi Arabia

This study presents the influence of zn and Nd co-substitution on structure,morphology,Ac susceptibility and zfc-fc magnetizations of Sr nanohexaferrites(Nhfs),Srfe12-x(zn,Nd)xo19(0.0≤x≤1.0),which was produced by sol-gel *** powder patterns,scanning electron microscopy(SEm) and high-resolution transmission electron spectroscopy(hr-TEm) approve the synthesis of Sr m-type *** spectra show that zn^2+ions occupy 2 b and 4f1 sites while Nd3+ions locate at 2 a,4f2 and 12 k *** magnetic properties of the produced Sr-Nhfs were investigated also by zfc-fc magnetizations and Ac *** to the mfc-mzfc results(between 2 and 400 K),no blocking temperature was detected which indicates the ferromagnetic(fm) behavior of *** lower temperatures,a super-spin glass like behavior is *** Ac susceptibility indicates that the magnetic interactions are improved due to the inclusion of low content(x=0.1) of Nd^3+and zn^2+ions into the ***,with further increasing the Nd^3+and zn^2+contents(x=0.9),the magnetic interactions are weakened.

关键词： Sr hexaferrites rare earths mossbauer spectroscopy Ac susceptibility zfc-fc

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