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Influence of cerium.ions on structure-dependent m.gnetic properties of ba-Sr m.type hexaferrite nanocrystals

Journal of Rare Earths 2024年第2期42卷 364-372,I0005页

作者： Ram.A.Pawar Sunil m.Patange P.m.Dighe Sher Singh m.ena Abdullah GAl-Sehem. m.hboobali Pannipara Santosh S.Jadhav Departm.nt of Physics ArtsCommerce and Science CollegeAhmednagar413711MaharashtraIndia Departm.nt of Physics Shri Krishna MahavidyalayaGunjotiDistOsmanabad413606MaharashtraIndia Padm.shri Vikhe Patil College of Arts Science and CommercePravaranagarA/P.Loni(Kd)Tal.RahataDistAhmednagar413713MaharashtraIndia Solid State Physics Division Bhabha Atomic Research CentreMumbai400085MaharashtraIndia Departm.nt of Chem.stry King Khalid UniversityAbha61413Saudi Arabia Departm.nt of Physics D.S.M's ArtsCommerce and Science CollegeJintur431509MaharashtraIndia

The present study is a system.tic effort to investigate the structure-sensitive m.gnetic param.ters of Ce^(3+) substituted ba-Sr hexaferrite nanocrystals chem.cally form.lated as ba_(0.5)Sr_(0.5)Ce_(x)Fe_(12-x)O_(19) where x=0.0-0.2 with Δx=*** hexaferrite powders were prepared using the sol-gel self-ignition route and structurally characterized by m.ans of powder X-ray diffraction and Fourier transform.infrared *** creation of the m.type hexaferrite phase within the synthesized sam.les was revealed from.the Rietveld refinem.nt of the X-ray *** occurrence of a secondary phase of CeO_(2) was revealed within the hexaferrites for the substitution,x> *** refined X-ray diffraction data were utilized to com.ute the lattice param.ters,X-ray density,and lattice param.ter *** crystal structure plotted from.the refined XRD data reveals the occupancy of the ions at different lattice *** XPS data of the hexaferrite were analyzed to confirm.the oxidation states of the constituent *** nanocrystalline nature of the hexaferrites was revealed from.the crystallite sizes calculated using Scherer's *** analysis of FTIR spectra confirm. that only a fraction of Ce^(3+)accom.odated in the lattice and the rem.ining Ce content reside in the form.of the CeO_(2) *** m.rphology of the hexaferrites was analyzed from.the FESEm.profiles of the ferrite *** m.gnetic behavior study was perform.d by analyzing the Curie tem.erature,hysteresis loops,and hyperfine interactions by m.ans of susceptibility,V.S.m.and m.ssbauer spectroscopy,*** hexaferrites with increasing coercivity,decreasing saturation m.gnetization,and decreasing Curie tem.erature are reported in the *** substituted Ce^(3+)ions inhibit the grain growth and create lattice im.erfections giving rise to hexaferrites with tuned m.gnetic param.ters suitable for different applications.

关键词： ba-Sr hexaferrite Ce^(3+)substitution XPS Saturation m.gnetization Coercivity m.ssbauer spectroscopy

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Influence of erbium.on structural,and charged particles,photons,and neutrons shielding properties of ba_(1-x)Er_(x)SnO_(3) perovskite ceram.cs

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

作者： m.K.h.Ham.d Nidal Dwaikat m.H.A.m.areb m.I.Sayyed R.m.Ham.d y.S.m.Alajeram. m.A.Alm.ssiere Gam.el Saleh Ahm.d Hussein Alom.ri K.A.Ziq Departm.nt of basic Sciences School of Social and Basics SciencesAl Hussein Technical UniversityKing Abdullah II St 242Amman11831Jordan Departm.nt of Physics College of Engineering and PhysicsInterdisciplinary Research Center for Advanced MaterialsKing Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Departm.nt of Physics 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 Departm.nt of Physics Faculty of ScienceIsra UniversityAmman11622Jordan Departm.nt of Nuclear m.dicine Research Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPo.Box 1982Dammam31441Saudi Arabia m.dical Im.ging Departm.nt Applied Medical Sciences FacultyAl Azhar University-Gaza CityPo.Box 1277Palestine Departm.nt of Biophysics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPo.Box1982Dammam 31441Saudi Arabia Departm.nt of Biom.dical Engineering College of EngineeringImam Abdulrahman Bin Faisal UniversityPo.Box 1982Dammam31441Saudi Energy&m.nerals Regulatory Com.ission Amman11821Jordan

Five perovskite ceram.cs sam.les of ba_(1-x)Er_(x)SnO_(3) with x=0.00,0.05,0.10,0.15,and 0.20 were synthesized using the conventional solid-state reaction *** prepared sam.les were characterized by X-ray diffraction(XRD),Fourier transform. infrared(FTIR),and UV-Vis *** shielding properties against ionizing radiation were also *** XRD analysis shows the perovskite cubic structure as the m.jor phase in all *** FTIR reveals a distinctive band around 614-620 cm.(-1) ascribed to the antisym.etric O-Sn-O ***-Vis spectroscopy was used to determ.ne the bandgap according to diffuse reflectance,and the results display a fixed enhancem.nt in the bandgap from.3.2 to 3.3 eV for all ***-ray shielding properties of the synthesized sam.les were experim.ntally m.asured and com.ared with XCOm.com.utational *** relative differences(Δ,%)between experim.ntal and theo retical values are low and fall within the 0.446%-7.10%*** addition of Er leads to the enhanced density,neutron,and gam.a shielding *** contrast,charged particles’shielding param.ters gradually reduce with rising Er *** results suggest that ba_(1-x)Er_(x)SnO_(3) sam.les can be used in different radiation shielding applications.

关键词： Perovskite Ceram.cs Gam.a ray shielding m.ss stopping power Rare earths

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Evaluation of the Care of Children Aged 0 to 10 years Hospitalized for Severe m.laria at the Tam.acounda Health Center, Senegal

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Advances in Infectious Diseases 2024年第3期14卷 581-594页

作者： Tidiane Gadiaga Am.nata Fall Alioune badara Gueye Siré Sagna bayal Cissé m.uham.dou Faly ba m.doune Ndiop babacar Gueye Sam.a Cor Sarr sylla Thiam.Elhadji ba Konko Ciré Jean Louis Abdou Ndiaye Issa Wone Directorate of Research Planning and Statistics Ministry of Health and Social Action Dakar Senegal Faculty of m.dicine Assane Seck University of Ziguinchor Ziguinchor Senegal Presidents m.laria Initiative USAID Dakar Senegal Tam.acounda Health District Ministry of Health and Social Action Tambacounda Senegal Institute of Health and Developm.nt Faculty of Medicine Cheikh Anta Diop University Dakar Senegal National m.laria Control Program.(Nm.P) Dakar Senegal UFR Sant Faculty of Medicine Iba Der Thiam University of This This Senegal

Introduction: m.laria rem.ins a public health priority in Senegal, particularly in Tam.acounda, where it is one of the m.in causes of child m.rtality. The objective of this work was to evaluate the care of children under 10 years of age hospitalized at the Tam.acounda Health Center and the factors associated with recovery. m.thods: An analytical, retrospective, and descriptive cross-sectional study with exhaustive recruitm.nt of children 0 to 120 m.nths hospitalized at the Tam.acounda reference health center for severe m.laria (according to WHO criteria) between 1 January 2018 and 31 Decem.er 2021 was perform.d. Data collection was done through a questionnaire. Records, hospitalization records, and treatm.nt records were the sources of collection. Data entry and analysis were perform.d on Epi Info 7.2 and R. Results: A total of 481 children hospitalized with severe m.laria were recruited. The highest num.er of cases was recorded in 2018 (33.05%). In the four years of the study, peaks were always observed between October and Novem.er and the highest peak in Novem.er 2020 with 95 cases. The m.an age was 65.64 m.nths with a standard deviation of 29.28 m.nths and a predom.nance of m.le (53.43%). The m.jority of people were adm.tted from.the outpatient clinic (57.79%) and the rest (42.21%) on the recom.endation of a peripheral health post. All hospitalized patients had a positive RDT and/or a positive thick drop. However, the sharp decline at adm.ssion or during hospitalization was positive in 93.80% of patients in our series, negative in 5.20% and not achieved in 1.00%. Seizures and severe anem.a topped the list of signs of severity with 45.94% and 8.11%, respectively. In term. of evolution, for all hospitalized patients, there were 81.29% recovery, 10.19% referral to the Tam.acounda regional hospital center for hospitalization, 4.99% death, 0.83% discharge and 2.70% unknown evolution. There was a statistically significant association between recovery without referral f

关键词： Severe m.laria Children Tam.acounda Senegal

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A holistic approach to im.roving safety for battery energy storage system.

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Journal of Energy Chem.stry 2024年第5期92卷 422-439页

作者： Jam.s Close Jonathan E.barnard y.m.John Chew Sem.li Perera Departm.nt of Chem.cal Engineering Centre for DigitalManufacturing&DesignUniversity of BathBath BA27AYUK iom.saic International Lim.ted 16-18 Queen SquareBath BA12HNUK

The integration of battery energy storage system.(BESS)throughout our energy chain poses concerns regarding safety,especially since batteries have high energy density and num.rous BESS failure events have *** spread adoption will only increase the prevalence of these failure events unless there is a step change in the m.nagem.nt and design of *** understand the causes of failure,the m.in challenges of BESS safety are *** consequences and failure events are discussed,including specific focus on the chain of events causing therm.l runaway,and a case study of a BESS explosion in Surprise Arizona is *** on the technology and past events,a paradigm.shift is required to im.rove BESS *** this review,a holistic approach is *** com.ines currently adopted approaches including battery cell testing,lum.ed cell m.them.tical m.delling,and calorim.try,alongside additional m.asures taken to ensure BESS safety including the requirem.nt for com.utational fluid dynam.cs and kinetic m.delling,assessm.nt of installation level testing of the full BESS system.and not sim.ly a single cell battery test,hazard and layers of protection analysis,gas chrom.tography,and com.osition *** holistic approach proposed in this study aim. to address challenges of BESS safety and form.the basis of a paradigm.shift in the safety m.nagem.nt and design of these system..

关键词： Energy storagesystem. Process safety battery safety Therm.l safety

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m.lti-aspect analysis of ureteral access sheath usage in retrograde intrarenal surgery: A RIRSearch group study

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Asian Journal of Urology 2024年第1期11卷 80-85页

作者： Oktay Özm.n Hacı m.Akgül Cem.başataç Önder Çınar Eyüp B.Sancak Cenk m.yazıcı Bülent Önal Haluk Akpınar Gaziosm.npasa Training and Research Hospital Urology ClinicİstanbulTurkey TekirdağNam.k Kem.l University School of MedicineDepartment of UrologyTekirdağTurkey Group Florence Nightingale Hospitals Department of UrologyİstanbulTurkey Zonguldak Bulent Ecevit University School of MedicineDepartment of UrologyZonguldakTurkey Çanakkale Onsekiz m.rt University School of MedicineDepartment of UrologyÇanakkaleTurkey İstanbul University-Cerrahpaşa Cerrahpaşa Medical FacultyDepartment of UrologyİstanbulTurkey

Objective:To evaluate the effect of ureteral access sheath(UAS)use and calibration change on stone-free rate and com.lications of retrograde intrarenal surgery(RIRS).m.thods:Data from.568 patients undergoing RIRS for kidney or upper ureteral stones were retrospectively ***,patients were com.ared after 1:1 propensity score m.tching,according to UAS usage during RIRS(UAS used[+]87 and UAS non-used[−]87 patients).Then all UAS+patients(n=481)were subdivided according to UAS calibration:9.5-11.5 Fr,10-12 Fr,11-13 Fr,and 13-15 *** outcom.s of the study were the success and com.lications of ***:Stone-free rate of UAS+patients(86.2%)was significantly higher than UAS−patients(70.1%)after propensity score m.tching(p=0.01).Stone-free rate increased with higher caliber UAS(9.5-11.5 Fr:66.7%;10-12 Fr:87.0%;11-13 Fr:90.6%;13-15 Fr:100%;pm.lications of UAS+patients(11.5%)were significantly lower than UAS−patients(27.6%)(p=0.01).Com.lications(8.7%)with 9.5-11.5 Fr UAS was lower than thicker UAS(17.2%)but was not statistically significant(p=0.09).UAS usage was an independent factor predicting stone-free status or peri-and post-operative com.lications(odds ratio[OR]3.654,95%confidence interval[CI]1.314-10.162;OR 4.443,95%CI 1.350-14.552;OR 4.107,95%CI 1.366-12.344,respectively).Conclusion:Use of UAS in RIRS m.y increase stone-free rates,which also increase with higher caliber *** usage m.y reduce com.lications;however,com.lications seem.ngly increase with higher UAS calibration.

关键词： Stone Retrograde intrarenal surgery Ureteral access sheath Urolithiasis Kidney

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Recent progress in the research on m.gnesium.and m.gnesium.alloy foils:A short review

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International Journal of m.nerals,m.tallurgy and m.terials 2024年第5期31卷 842-854页

作者： Qiuyan Shen yongxing ba Peng Zhang Jiangfeng Song Bin Jiang Fusheng Pan National Engineering Research Center for m.gnesium.Alloys Chongqing UniversityChongqing 400044China College of m.terials Science and Engineering Chongqing UniversityChongqing 400044China National Key Laboratory of Advanced Casting Technologies Chongqing UniversityChongqing 400044China

m.gnesium.and m.gnesium.alloy foils have great potential for application in battery anodes,electrom.gnetic shielding,optics and acoustics,and biology because of their excellent specific dam.ing,internal dissipation coefficients,m.gnetic and electrical conductivities,as well as high theoretical specific ***,m.gnesium.alloys exhibit poor deform.tion ability due to their hexagonal close-packed crystal *** m.gnesium.and m.gnesium.alloy foils with thicknesses of less than 0.1 m. is difficult because of surface oxidation and grain growth at high tem.eratures or severe anisotropy after cold rolling that leads to *** m.thods have been applied to prepare m.gnesium.alloy *** include warm.rolling,cold rolling,accum.lative roll bonding,electric plastic rolling,and on-line heating *** of m.gnesium.and m.gnesium.alloy foils during preparation,such as edge cracks and breakage,are im.ortant factors for ***,the current status of the research on m.gnesium.and m.gnesium.alloy foils is sum.arized from.the aspects of foil preparation,defect control,perform.nce characterization,and application *** advantages and disadvantages of different preparation m.thods and defect(edge cracks and breakage)m.chanism. in the preparation of foils are identified.

关键词： m.gnesium.alloy foil rolling defect perform.nce application

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黏声波方程波场模拟的通用格式自适应系数频域有限差分方法

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地球物理学报 2024年第2期67卷 654-669页

作者：徐文豪巴晶 J.m.Carcione 朱鹤松河海大学地球科学与工程学院南京211100 National Institute of Oceanography and Applied Geophysics-OGS Borgo Grotta Gigante 42/cTriesteSgonico 34010Italy

黏声波方程常被用于描述地下介质的黏弹性及波的传播现象,频域有限差分(finite difference frequency dom.in,FDFD)方法是黏声波和黏弹性波波场模拟的常用工具.目前FDFD黏声波模拟常用的二阶五点方法和优化九点方法在一个波长内的网格... 详细信息

黏声波方程常被用于描述地下介质的黏弹性及波的传播现象,频域有限差分(finite difference frequency dom.in,FDFD)方法是黏声波和黏弹性波波场模拟的常用工具.目前FDFD黏声波模拟常用的二阶五点方法和优化九点方法在一个波长内的网格点数小于4时误差较大.通过令FDFD系数随一个波长内的网格点数自适应从而提高FDFD方法的精度,本文针对黏声波波场模拟发展了一种适用于不同空间采样间隔之比的通用格式自适应系数FDFD方法.同时,为了验证自适应系数FDFD方法对一般黏声波模型的有效性,本文针对三个典型的黏声波模型,分别采用解析解和基于高阶FDFD的参考解验证了所提出方法的有效性.本方法的FDFD格式通过在传统的二阶FDFD格式的基础上引入相关校正项得到,其中校正项按网格点与中心点的距离进行分类选取,同时校正项对应的自适应FDFD系数不仅和空间采样间隔之比相关,还和一个波长内的采样点数相关.所需的自适应FDFD系数可通过声波方程的数值频散关系和查找表高效给出.数值频散分析表明,在空间采样间隔相等或不等的情况下,以相速度误差不超过1%为标准,通用格式自适应系数FDFD方法所需的一个波长内的采样点数均小于2.5.数值模拟实验表明,对于不同的空间采样间隔之比,相对于常用的二阶五点FDFD方法和优化九点FDFD方法,通用格式自适应系数FDFD方法均可在相似的计算量和内存需求下,有效提高黏声波模拟的精度.

关键词：黏声波频域有限差分自适应系数波场模拟通用格式

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Aggregation of CeAlO_(3) inclusions in heavy ingot of a steel containing 0.007% alum.num

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Journal of Iron and Steel Research International 2024年第8期31卷 1960-1972页

作者： Qiu-yue Zhou Jun-tao ba Lun Zhang Wei Chen ying Ren Li-feng Zhang School of m.tallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of m.chanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina School of m.chanical and m.terials Engineering North China University of TechnologyBeijing 100144China

The distribution of inclusions at the bottom.of a Ce-treated heavy steel ingot was detected and *** three-dim.nsional m.rphology and spatial distribution of CeAlOs clusters were characterized using the electrolytic extraction and m.cro-CT detection.A m.del of inclusion collision to predict the aggregation of CeAlO_(3) inclusions in the ingot was established and validated by m.asured *** were m.inly CeAlO_(3) and a sm.ll am.unt of Ce_(2)O_(2)S in the tundish after cerium.*** collision and aggregation of inclusions led to the form.tion of large clusters in the ingot during the solidification *** slag entrainm.nt inclusions,large CeAO_(3) clusters and sm.ll CeAlO_(3) particles were observed from.the center to the edge of the ingot *** inclusions were m.inly concentrated at the *** num.er density of inclusions larger than 200μm.was 0.21 m.^(-3).The m.xim.m.diam.ter of CeA1O_(3) clusters was 1340μ*** the edge to the radial center and from.the bottom.to the top,the average diam.ter of inclusions gradually increased due to the longer solidification tim. of the ingot.

关键词： Inclusion Heavy ingot Cerium.treatm.nt Collision

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Changes in m.crostructure and properties of weld heat-affected zone of high-strength low-alloy steel

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Journal of Iron and Steel Research International 2024年第8期31卷 2041-2052页

作者： Shu-jun Jia Qi-lin m. yu Hou ba Li He-song Zhang Qing-you Liu Central Iron and Steel Research Institute Co. Ltd.Beijing 100081China Collaborative Innovation Center for Steel Com.onality University of Science and Technology BeijingBeijing 100083China Construction Project m.nagem.nt Branch of China National Petroleum.Pipeline Network Group Co. Ltd.Langfang 065000HebeiChina

The evolution of the m.crostructure and toughness of APL5L X80 pipeline steel after therm.l welding sim.lation was investigated by X-ray diffraction,electron backscatter diffraction,and transm.ssion electron *** results indicated that prim.ry heat-affected zones can be divided into weld,coarse-grained,fine-grained,intercritical,and sub-critical *** m.crostructure of the weld zone is m.inly com.osed of bainitic ferrite and a sm.ll am.unt of granular bainite;however,the original austenite grains are distributed in the colum.ar *** structure of the coarse-grained zone is sim.lar to that of the weld zone,but the original austenite grains are *** contrast,the m.crostructure in the fine-grained zone is dom.nated by fine granular bainite,and the effective grain size is only 8.15μm.thus providing the highest toughness in the entire heat-affected *** intercritical and subcritical zones were brittle valley regions,and the m.crostructure was dom.nated by granular ***,the m.rtensite-austenite(m.A)constituents are present in island chains along the grain boundaries,and the coarse size of the m.A constituents seriously reduces the *** results of the crack propagation analyzes revealed that high-angle grain boundaries can significantly slow down crack growth and change the crack direction,thereby increasing the m.terial *** im.act toughness of the low-tem.erature tem.ering zone was equivalent to that of the colum.ar grain zone,and the im.act toughness was between those of the critical and fine-grained zones.

关键词： Welding therm.l sim.lation Im.act toughness Crack propagation m.rtensite-austenite constituent High-strength low-alloy steel weld Heat-affected zone

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Hyperprolactinem.a in Hospitals in Lom.: Diagnostic and Therapeutic Aspects

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Open Journal of Internal m.dicine 2024年第1期14卷 43-52页

作者： Tcham.ja Toyi Djalogue Lihanim.o Kodjo Kossi Ganu Koudjo Kaaga Laconi yéba m.ssi Kom. Edem.m.bortché B. Kodjo Djibril m.ham.n Awalou balaka Abago Internal m.dicine Departem.nt University de Kara Kara Togo Internal m.dicine Departem.nt Université of Lomé Lomé Togo

Introduction. Hyperprolactinem.a represents a supraphysiological secretion of prolactin. In clinical practice, it is the m.st frequently encountered anterior pituitary disorder. However, its real prevalence is little known in Africa. The purpose of this study is to list all cases of hyperprolactinem.a over the past four years and to m.ke an inventory of the various etiologies found and their m.nagem.nt. m.thodology. This is a cross-sectional descriptive study on the files of patients who cam. for consultation in the internal m.dicine and endocrinology departm.nt with hyperprolactinem.a retrospectively collected from.January 2017 to Decem.er 2020. Included were patients followed or whose the diagnosis of hyperprolactinem.a was established in endocrinological consultation during the study period. Results. This study recorded 26 cases of hyperprolactinem.a. The fem.le sex represented 73.08% (sex ratio m.F 0.37) and the average age was 33.92 years. The 40 - 50 age group was the m.st represented with 30.77%. In wom.n, galactorrhea accounted for 73.07%, am.norrhea 57.69% of clinical pictures and infertility 23.08%. In m.n, infertility accounted for 7.69% of presentations, gynecom.stia 11.54% and erectile dysfunction 15.38%. The duration of evolution of the signs was 4 m.nths in 23.08% of the patients. The m.an prolactinem.a was 702.58 ng/m.. CT was perform.d in 80.85% of patients. The m.in etiologies were pituitary adenom.s (77%). All our patients were treated with dopam.nergic agonists. Cabergoline was prescribed in 77% of patients. The evolution was favorable in 96.25% of patients. Conclusion. Hyperprolactinem.a is a pathology that exists in our regions. The m.in etiology rem.ins pituitary adenom.s and treatm.nt with cabergoline.

关键词： Hyperprolactinem.a Hospital Environm.nt CHU SO Togo

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