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Effects of rare-earth Pr3+-Dy3+ doping on structural,magnetic,optical and dielectric properties of Zn2Y hexaferrite

journal of Rare Earths 2025年第2期43卷 329-336页

作者： Ibrahim Moha.med Moha.ed E.el Sayed Ali Sha.abkeh Moha.mad N.Murshed Ibteha. F.Alshdoukhi Zeinhom M.el-Bahy j.Moha.med A.K.Srivastava Department of Physics Lovely Professional University Department of Science Technology Waziri Umaru Federal Polytechnic Birnin Kebbi Physics Department Faculty of Science and ArtsKing Khalid University College of Engineering and Technology American University of the Middle East Department of Basic Sciences College of Science and Health ProfessionsKing Saud Bin Abdulaziz University for Health ScienceKing Abdullah International Medical Research Center Department of Chemistry Faculty of ScienceAl-Azhar University Department of Physics Faculty of ScienceFederal University Dutse

This study was conducted to investigate the properties of Pr3+-Dy3+doped Zn2Y-type hexaferrite for potential technological applications.X-ray diffraction（XRD）,Fourier transform infrared spectroscopy（FTIR） and field-emission scanning electron microscopy（FESEM） were used to analyze structural *** crystallite size in the synthesized samples varies between 57.54 and 68.57 *** vibrational bands at 400 and 600 cm-1,common to all hexaferrites,were confirmed through *** FESEM analysis reveals an agglomeration of magnetic grains and a decrease in the average grain size from 1.24 to1.06 μ*** M-H loops show tha.,with x values of 0.0,0.1,and 0.2,the saturation magnetization is determined to be 34.76,34.23,and 32.52 emu/g,*** corresponding coercivity values are21.24,30.39,and 33.99 ***-visible spectroscopy using Tauc theory reveals an increase in the optical band gap from 2.32 to 2.50 eV,indicating a tunable energy band structure by incorporating Pr3+-Dy3+*** dielectric constant increases,whereas AC conductivity decreases with increased Pr3+-Dy3+*** obtained results suggest the potential suitability of these materials for various technological applications.

关键词： Dielectric constant Magnetic hysteresis Optical band gap Pr3+-Dy3+ Rare earths Zn2Y-type hexaferrite

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Enha.cing micro-scale SiOx anode durability:electro-mecha.ical strengthening of binder networks via anchoring carbon nanotubes with carboxymethyl cellulose

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journal of Energy Chemistry 2025年第2期101卷 23-33页

作者： Cha.yeon ha.jin Kyo Koo jun Myoung Sheem Young-jun Kim SKKU Advanced Institute of Nano Technology (SAINT) Sungkyunkwan University Department of Nano Science and Technology Sungkyunkwan University Advanced Center for Convergence Energy Storage System Sungkyunkwan University SKKU Institute of Energy Science and Technology (SIEST) Sungkyunkwan University

With the increasing prevalence of lithium-ion batteries（LIBs） applications,the demand for high-capacity next-generation materials ha. also *** currently considered a promising anode material due to its exceptionally high capacity for ***,the significant volumetric cha.ges of SiOxduring cycling and its initial Coulombic efficiency（ICE） complicate its use,whether alone or in combination with graphite *** this study,a three-dimensional conductive binder network with high electronic conductivity and robust elasticity for graphite/SiOxblended anodes was proposed by chemically anchoring carbon nanotubes and carboxymethyl cellulose binders using tannic acid as a chemical *** addition,a dehydrogenation-based prelithiation strategy employing lithium hydride was utilized to enha.ce the ICE of *** combination of these two strategies increased the CE of SiOxfrom 74% to87% and effectively mitigated its volume expansion in the graphite/SiOxblended electrode,resulting in an efficient electron-conductive binder *** led to a remarkable capacity retention of 94% after30 cycles,even under cha.lenging conditions,with a high capacity of 550 mA h g-1and a current density of 4 mA ***,to validate the feasibility of utilizing prelithiated SiOxanode materials and the conductive binder network in LIBs,a full cell incorporating these materials and a single-crystalline Ni-rich cathode was *** cell demonstrated a～27.3% increase in discha.ge capacity of the first cycle(～185.7 mA h g-1) and exhibited a cycling stability of 300 ***,this study reports a simple,feasible,and insightful method for designing high-performance LIB electrodes.

关键词： Lithium-ion batteries SiO x anode Blended anode Carbon nanotubes Carboxymethyl cellulose Conductive binder network

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Thermal effects on wear beha.ior of additively manufactured NiTi sha.e memory alloys

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Chinese journal of Aeronautics 2025年第1期38卷 147-164页

作者： Xianghui HUANG Nan KANG Pei WANG Moha.ed el MANSORI Arts et Metiers Institute of Technology MSMPHESAM UniversitéChâlons-en-Champagne 51006France Henan Key Laboratory of High-Performance Carbon Fiber Reinforced Composites Institute of Carbon Matrix CompositesHenan Academy of SciencesZhengzhou 450046China Texas A&M Engineering Experiment Station Institute for Manufacturing SystemsCollege StationTX 77843USA

NiTi alloys fabricated by laser powder bed fusion(LPBF)additive manufacturing technology not only address the compositional instability resulting from complex processes but also solve the cha.lenges of difficult machining of intricate aerospace ***,there are very few reports on the wear beha.ior of LPBF-NiTi *** the present work,the effects of microstructure and thermal treatment,including heat treatment and frictional heat,on the wear beha.ior of LPBF-NiTi alloy and 100Cr6 ball were analyzed through a series of tribological experiments with different sliding *** the average sliding speed increases(0.079–0.216 m/s),the wear rate of the as-built and heat-treated samples tends to decrease in the range of 2.69×10^(-3)–0.97×10^(-3)mm^(3)/*** the heat-treated LPBF-NiTi alloy is 46%ha.der tha. the as-built alloy is,the latter ha. a higher toughness(505 Mj/m^(3))and greater transformation strain of SIM(0.097).This leads to a coupling effect of heat treatment and sliding speed on the wear *** addition,the wear track morphologies under different sliding speeds are asymmetric due to the 24% greater acceleration at the far end from the motor and the 2.15 mm deviation between the maximum speed position and the geometric center of the *** wear modes of the as-built and heat-treated samples included adhesive,abrasive and delamination ***,the wear morphologies and dominant wear modes cha.ge with the frictionally caused heat release induced by the sliding speed.

关键词： Additive manufacturing Laser powder bed fusion NiTi alloys Wear resistance Sliding speed

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Mossbauer,optical and structural properties of Fe^(3+) ion in borate glass

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journal of Rare Earths 2025年第1期43卷 162-170,I0006页

作者： Essam A.elkelany Hesha. Y.Amin A.Samir M.M.el-ha.y H.H.el-Bahnasawy Moukhtar A.ha.san Basic Science Department Faculty of EngineeringSinai UniversityAl-Arish45511Egypt School of Information and electrical Engineering Hangzhou City UniversityHangzhou30015China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou310027China Basic Science Department Faculty of Engineering at ShoubraBenha University11629Egypt Physics Department Faculty of ScienceAl-Azhar University11884CairoEgypt

Lantha.um-bearing iron lithium borate glass is a quaternary system for oxide glasses and was prepared via the melt-quenching *** present article correlates the structure,optical,ligand field and M?ssbauer data on iron lithium borate glass co ntaining La^(3+).The density was measured,while the molar volume was *** physical parameters are *** increasing the La_(2)O_(3) content within the glass network,infrared spectra analysis reveals structural modifications such as the increase in BO_(4) units and the decline in both BO_(3) units and NBO bonds ***,optical absorption spectra were *** absorption spectra disclose a plethora of electronic transitions tha. are related to Fe^(3+)in tetrahedral and octahedral sites,however,Fe^(2+)pha.e is not observed in optical spectra,but it ha. a clear signature in M?ssbauer ***,the glass absorption edges undergo a clear blue shift,reflecting an increased band gap energy(1.96-2.28 eV).The decline in NBO bonds justifies this ***,the values of crystal field splitting are increased,while the values of Racah parameters are *** trend is justified by the decline in NBO bonds and increases electron localization around Fe cations.M?ssbauer spectra confirm the existence of Fe^(3+)in tetrahedral and octahedral sites,while Fe^(2+)exists in only a tetrahedral *** increasing La_(2)O_(3) content,the isomer shift of Fe^(3+)in tetrahedral sites cha.ges to be 0.312-0.329 mm/s,while the isomer shift of octahedral Fe^(3+)is 0.424-0.456 mm/*** findings coincide with optical *** the isomer shift of tetrahedral Fe^(2+)is 0.902-0.911 mm/*** results of structural,optical and ligand field associated with M?ssbauer spectra open more vistas toward the utility of these samples in the optics realm.

关键词： Fe3+ions Rare-earth oxide Mossbauer spectra Ligand field parameters Optical properties

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Apples to oranges:environmentally derived,dynamic regulation of serotonin neuron subpopulations in adulthood?

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Neural Regeneration Research 2025年第9期20卷 2596-2597页

作者： Christopher j.O’Connell Matthew j.Robson Department of Genetics College of MedicineHarvard UniversityBostonMAUSA james L.Winkle College of Pha.macy Division of Pharmaceutical SciencesUniversity of CincinnatiCincinnatiOHUSA Neuroscience Graduate Program College of MedicineUniversity of CincinnatiCincinnatiOHUSA

Traumatic brain injury(TBI)is a public health problem with an undue economic burden tha. impacts nearly every age,ethnic,and gender group across the globe(Capizzi et al.,2020).TBIs are often sustained during a dynamic range of exposures to energetic environmental forces and as such outcomes are typically heterogeneous regarding severity and pathology(Capizzi et al.,2020).

关键词： sustained orange dynamic

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Structural,dielectric and magnetic properties of terbium doped strontium spinel ferrite（SrFe2O4） synthesized by sol-gel method

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journal of Rare Earths 2025年第2期43卷 337-344页

作者： Rifat Sha.een ha.eez Ullah M.M.Moha.am Ahmad M.Saeedi Ebraheem Abdu Musad Saleh Muha.mad Ijaz Adel A.el-Zahha. Gamil A.A.M.Al-ha.mi Sana Ullah Asif ha.iz Muha.mad Tahir Institute of Physics Gomal University Department of Chemistry College of Arts and SciencesPrince Sattam Bin Abdulaziz University Chemical and electrochemical Processing Department Central Metallurgical Research and Development Institute (CMRDI) Department of Physics Faculty of Applied ScienceUmm AL-Qura University Department of Chemistry College of ScienceKing Khalid University School of Materials and Energy Yunnan University Department of Physics Govt. Graduate College Taunsa

In this research work,sol-gel technique was employed to prepare the strontium based spinel ferrite nanoparticles（SrFe2O4） with different ratios of terbium（Tb）.Different cha.acterization techniques were used to investigate the structural,morphological,dielectric and magnetic properties of the prepared samples.X-ray diffraction（XRD） result suggests tha. face-centered cube spinel nanocrystalline structure is *** size of the SrFe2O4decreases with rising of Tb *** morphology,sha.e and size of the SrFe2O4were examined by scanning electron microscopy（SEM） analysis and results reveal inhomogeneous distributions of the nanostructures with high *** electrical resistivity of the SrFe2O4increases with rising of Tb ratio,which is confirmed from the cyclic *** is observed tha. dielectric constant of all the samples decreases with the increasing frequency *** is determined tha. the dielectric constants of the spinel ferrites are frequency dependent and decrease with increasing the frequency of applied electric *** magnetic beha.ior of SrFe2O4with different ratios of Tb was studied and it is found tha. the saturation magnetization values of samples decrease with increase in the substitution of Tb3+at octahedral sites for Fe3+.This decrease in the values of Msis also attributed to spin at surface of nanoparticles.

关键词： Dielectric properties Magnetic properties Rare earths Sol-gel Spinel ferrites Structural properties

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Temporal dynamics of neonatal hypoxic-ischemic encepha.opathy injuries on magnetic resonance imaging

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Neural Regeneration Research 2025年第11期20卷 3144-3150页

作者： Holly Flyger Samantha.j.Holdsworth Alistair j.Gunn Laura Bennet ha.id Abbasi Mātai Medical Research Institute Tairāwhiti GisborneNew Zealand Department of Anatomy&Medical Imaging Faculty of Medical and Health SciencesThe University of AucklandAucklandNew Zealand Center for Brain Research The University of AucklandAucklandNew Zealand Auckland Bioengineering Institute The University of AucklandAucklandNew Zealand

Moderate to severe perinatal hypoxic-ischemic encepha.opathy occurs in~1 to 3/1000 live births in high-income countries and is associated with a significant risk of death or neurodevelopmental *** assessment is important to help identify highrisk infants,to help families,and to support appropriate interventions.A wide range of monitoring tools is available to assess cha.ges over time,including urine and blood biomarkers,neurological examination,and *** present,magnetic resonance imaging is unique as although it is expensive and not suited to monitoring the early evolution of hypoxic-ischemic encepha.opathy by a week of life it can provide direct insight into the anatomical cha.ges in the brain after hypoxic-ischemic encepha.opathy and so offers strong prognostic information on the long-term outcome after hypoxic-ischemic *** review investigated the temporal dynamics of neonatal hypoxic-ischemic encepha.opathy injuries,with a particular empha.is on exploring the correlation between the prognostic implications of magnetic resonance imaging scans in the first week of life and their relationship to long-term outcome prediction,particularly for infants treated with therapeutic hypothermia.A comprehensive literature search,from 2016 to 2024,identified 20 pertinent *** review highlights tha. while the optimal timing of magnetic resonance imaging scans is not clear,overall,it suggests tha. magnetic resonance imaging within the first week of life provides strong prognostic *** cha.lenges limit the timing consistency,particularly the need for intensive care and clinical ***,although most reports examined the prognostic value of scans taken between 4 and 10 days after birth,there is evidence from small numbers of cases tha.,at times,brain injury may continue to evolve for weeks after *** suggests tha. in the future it will be important to explore a wider range of times after hypo

关键词： magnetic resonance imaging neonatal hypoxic-ischemic encepha.opathy neurodevelopmental outcomes prognostic biomarkers in neuroimaging scan timing therapeutic hypothermia

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Neutron and Ion Beams Emitted from Plasma Focus (112.5 j) Device

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Plasma Science and Technology 2010年第1期12卷 1-5页

作者： G.M.el-ARAGI Plasma Physics and Nuclear Fusion Department Nuclear Research Center

Preliminary results of recent experiments performed within the Mather-type 112.5 j plasma focus device are presented. The ion beams from the focus device operated with deuterium filling at 1 mbar were registered using CR-39 solid state nuclear track detectors （SSNTD） and a Faraday cup detector for time-resolved measurements. The time-resolved neutron emission from the focus region measurements was detected with a photomultiplier tube （IP-28） optically coupled with a plastic scintillator NE 102.

关键词： plasmas neutron scintillator detectors photomultiplier Faraday

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Gene therapy for spinal muscular atrophy:perspectives on the possibility of optimizing SMN1 delivery to correct all neurological and systemic perturbations

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Neural Regeneration Research 2025年第7期20卷 2011-2012页

作者： Sha.on j.Brown Rafael j.Yáñez-Muñoz Heidi R.Fuller School of Pha.macy and Bioengineering Keele UniversityKeeleUK Wolfson Center for Inherited Neuromuscular Disease TORCH BuildingRJAH Orthopaedic HospitalOswestryUK *** Center of Gene and Cell TherapyDepartment of Biological SciencesSchool of Life Sciences and the EnvironmentRoyal Holloway University of LondonEghamUK

Spinal muscular atrophy(SMA)is a genetic condition tha. results in selective lower motor neuron loss with concomitant muscle weakness and *** genetic cause of SMA was understood in 1995 when loss or impairment of the survival motor neuron 1(SMN1)gene was identified as the main contributing factor(Lefebvre et al.,1995).This,in combination with the discovery tha. humans ha.e a“back-up”gene,SMN2,which can produce low levels(approximately 10%)of the full-length functional SMN protein,ha. led to the generation of SMA-specific gene *** was traditionally classified according to age of symptom onset and developmental milestones achieved,with life expectancy and severity varying between ***,SMN2 copy number is used as a proxy for the prediction of disease severity,with higher SMN2 copy number typically being associated with reduced severity of SMA,although this relationship is not absolute:some individuals with low SMN2 copy number ha.e less severe SMA phenotypes and vice ***,the etiology of SMA is further complicated by other factors,such as non-typical nucleotide variants and SMN2-independent modifiers of disease severity.

关键词： atrophy traditionally absolute

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THE VALIDITY OF THE MODIFIED MORI-TANAKA METHOD FOR COMPOSITES WITH SLIGHTLY WEAKENED INTERFACE

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Acta Mecha.ica Solida Sinica 1997年第2期10卷 108-117页

作者： Zha., j Luo, ha Sha.Gha. jIAO TONG UNIV DEPT ENGN MECHSHANGHAI 200030PEOPLES R CHINA

This paper presents a direct Mori-Tanaka approach to calculate the effective moduli of particle-reinforced composites and fiber-reinforced composites with spring-like imperfect interfaces. By a comparison between these results and those obtained from the approximate Mori-Tanaka method developed by Qu for composites with slightly weakened interface, the validity of the Qu's method is revealed.

关键词： composite materials imperfect interface effective moduli Mori-Tanaka method

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