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A detailed comparison of the composition of(RE)-ba-Cu-O-Ag bulk superconductors

Superconductivity 2024年第1期9卷 87-94页

作者： j.V.j.Congreve Y.Shi A.R.Dennis h.Druiff N.C.Tutt D.A.Cardwell j.h.Durrell Department of Engineering University of CambridgeCambridgeUK

The homogeneity of the microstructure and composition are critical in determining the properties of rare earthbarium‐cuprate,single grain bulk superconductors[(RE)BCO].The magnitude of the trapped magnetic field achieveable in these technologically important materials,in particular,is influenced heavily by the size and distribution of(RE)_(2)baCuO_(x)(RE‐211)flux pinning inclusions in the bulk microstructure,whereas the size and distribution of silver agglomerates present within the bulk superconducting matrix correlate directly with improved mechanical *** careful engineering,these materials have significant potential for application in range of devices related to energy storage,medicine,electro‐magnetic machinery and microelectronic *** of(RE)BCO bulk superconductors typically involves heating a powder compact above its peritectic decomposition temperature followed by slow cooling to facilitate the growth of a single ***(RE)BCO composition has a different peritectic temperature and growth rate,which,therefore,necessitates different requirements in the heating *** fabrication temperature and growth rate,for example,may have an effect on the RE‐211 and silver distribution,which may,in turn,affect the superconducting properties of the resulting single *** this work we compare the distributions of silver and RE‐211 in the single grain microstructures of YBCOAg,GdBCO‐Ag,EuBCO‐Ag and SmBCO‐Ag bulk superconductors using optical microscopy,scanning electron microscopy and energy dispersive X‐ray *** observe that the distributions are very similar along both the a/b‐axis and c‐axis of these *** suggests that factors other than the maximum temperature used to achieve peritectic decomposition and the rate of single grain growth are particularly influential in determining the properties of the as‐processed samples in the top seeded melt growth *** observation demonstrates there is freedom to us

关键词： YBCO‐Ag GdBCO‐Ag SmBCO‐Ag EuBCO‐Ag Composition Bulk superconductor

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Influence of Solid Fraction on Gravity Segregation of Sn in A1-20Sn Alloy Casting

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journal of Materials Science & Technology 2000年第6期16卷 577-580页

作者： Zhang P. Du Y.h. Zeng D.B. Cui j.Z. ba L.M. Dep. of Mechanical Eng. Tsinghua Univ. Beijing 100084 China

The influence of solid fraction of Al-20Sn alloy mushy on gravity segregation of Sn in casting was studied . The relationship between solid fraction and the temperature of alloy mushy and that between solid fraction of alloy mushy and size of Sn particle in ingot were determined. The results show that the relationship between solid fraction and the temperature of alloy mushy was fs=1683-4.86t+0.003 5t2. The extent of gravity segregation of Sn in casting reduced gradually with the increase of solid fraction of alloy mushy. When solid fraction of alloy mushy was larger than 40%, the gravity segregation of Sn in casting could be removed basically, and the relationship between solid fraction of alloy mushy and size of Sn particle in ingot was s=-0.64fs+70.8.

关键词： Metal casting

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三轴形变核^(131)ba中的奇异集体激发模式

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物理学报 2024年第11期73卷 89-100页

作者：韦锐周厚兵王思成丁兵强赟华贾晨旭陈红星郭松 C.M.Petrache D.Mengoni A.Astier E.Dupont 吕冰锋 D.bazzacco A.Boso A.Goasduff F.Recchia D.Testov F.Galtarossa G.jaworski D.R.Napoli S.Riccetto M.Siciliano j.j.Valiente-Dobon C.Andreoiu F.h.Garcia K.Ortner K.Whitmore A.Ataç-Nyberg T.Bäck B.Cederwall E.A.Lawrie I.Kuti D.Sohler T.Marchlewski j.Srebrny A.Tucholski 广西师范大学物理科学与技术学院桂林541004 广西核物理与核技术重点实验室桂林541004 中国科学院近代物理研究所兰州730000 中国科学院大学北京100049 巴黎萨克雷大学 CNRS/IN2P3IJCLab奥赛91405 帕多瓦大学物理和天文学系帕多瓦I-35131 意大利国家核物理研究所帕多瓦分部帕多瓦I-35131 意大利国家核物理研究所莱尼亚罗国家实验室莱尼亚罗(帕多瓦)I-35020 费拉拉大学理学与自然科学院费拉拉西蒙菲莎大学化学系本拿比BC V5A 1S6 皇家理工学院物理系斯德哥摩尔S-10691 国家研究基金会iThemba加速器科学实验室西萨默塞特7123 西开普大学物理与天文系贝尔维尔ZA-7535 hUN-REN原子核研究所德布勒森4001 华沙巴斯德拉大学重离子实验室华沙02-093

利用意大利Legnaro实验室串列静电加速器提供的65 MeV^(13)C束流与122Sn靶的熔合蒸发反应布居了^(131)ba的高自旋态,并搭建了新的能级纲图.新的能级纲图由15条转动带组成,包括三对手征双重带,其中两对正宇称手征带为赝自旋-手征四重带.... 详细信息

利用意大利Legnaro实验室串列静电加速器提供的65 MeV^(13)C束流与122Sn靶的熔合蒸发反应布居了^(131)ba的高自旋态,并搭建了新的能级纲图.新的能级纲图由15条转动带组成,包括三对手征双重带,其中两对正宇称手征带为赝自旋-手征四重带.正负宇称手征带通过一系列增强的E1跃迁连接,表明它们之间存在八极关联.在低自旋区域搭建了一条新的转动带,通过一系列γ跃迁向νh1_(1/2)晕带退激.这种能级结构与摇摆带相似,但基于现有的实验证据还难以将它确认为摇摆带,不能排除其他集体激发机制,如γ振动的影响.

关键词：高自旋态手征带赝自旋八极关联摇摆运动

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Assisting Ni catalysis by CeO_(2) with oxygen vacancy to optimize the hydrogen storage properties of Mgh_(2)

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journal of Materials Science & Technology 2023年第28期159卷 62-71页

作者： jiangchuan Liu Qinke Tang Yunfeng Zhu Yana Liu jiguang Zhang Zhixin ba Xiaohui hu Liquan Li College of Materials Science and Engineering Jiangsu Collaborative Innovation Centre for Advanced Inorganic Function CompositesNanjing Tech UniversityNanjing 211816China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China

Although Mgh_(2) has been widely regarded as a promising material for solid-state hydrogen storage,its high operating temperature and slow kinetics pose a major bottleneck to its practical ***,a nanocomposite catalyst with interfacial coupling and oxygen defects,Ni/CeO_(2),is fabricated to promote h_(2) desorption and absorption properties of Mgh_(2).The interface of Ni/CeO_(2) contributes to both strong mechanical coupling towards stabilizing partial Ni and electronic coupling towards inducing a high con-centration of oxygen vacancies in CeO_(2).Theoretical calculations evidence that CeO_(2) with oxygen vacancy assist Ni in weakening the energy of Mg-h bond as well as enhancing the adsorption energy of Ni upon hydrogen atoms,and the extent of this assistance surprisingly increases with increasing oxygen vacancies *** a result,an impressive performance is achieved by Mgh_(2)-5 wt.%Ni/CeO_(2) with onset desorption temperature of only 165°C,and it absorbs approximately 80%hydrogen in just 800 s at 125°*** generation mechanism of intermediate active species concerning Ni/CeO_(2) in different states has been analyzed for the first time,and the relationship between interfacial coupling and phase evolution has been ***,a mechanism of the catalysis-assisting effect regarding oxygen defects is *** is believed that this work provides a unique perspective on the mechanism of interfacial coupling and the generation of defects in composite catalysts.

关键词： hydrogen storage Interfacial coupling Oxygen defects Catalysis-assisting

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Reduction of dietary crude protein and feed form:Impact on broiler litter quality,ammonia concentrations,excreta composition,performance,welfare,and meat quality

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Animal Nutrition 2022年第2期9卷 291-303页

作者： Madri Brink Geert P.j.janssens Peter Demeyer Ozer bagci Evelyne Delezie Flanders Research Institute for Agriculture Fisheries and Food(ILVO)Animal Sciences UnitScheldeweg 689090 MelleBelgium Department of Nutrition Genetics and EthologyGhent UniversityHeidestraat 199820 MerelbekeBelgium Flanders Research Institute for Agriculture Fisheries and Food(ILVO)Agricultural Engineering UnitBurg.Van Gansberghelaan 1159820 MerelbekeBelgium Department of Mechanical Engineering Eindhoven University of Technology5600 MB-EindhovenNetherlands.

Nitrogen(N)excreted by poultry is converted to ammonia(Nh3),presenting an environmental risk and a health risk to the farmer and animals.A study was performed to investigate the effect of reduced CP and feed form on broiler performance and welfare,meat and litter quality,N utilization,and Nh3 concentrations at litter level.A total of 2,232 Ross 308 male broilers was divided into 6 treatments and 6 replicates,which was fed diets in both pellet and mash forms with different CP levels of 205.0 g/kg(h,high),187.5 g/kg(M,intermediate)and 175.0 g/kg(L,low)in the grower phase and 195.0 g/kg(h),180.0 g/kg(M)and 165.6 g/kg(L)in the finisher *** amino acids(AA)were supplemented to maintain digestible AA-to-digestible lysine *** dietary CP content to 187.5 g/kg in the grower phase and 180.0 g/kg in the finisher phase reduced Nh3 concentrations at litter level(Pher reduction in dietary CP had no additional *** treatments had better litter qualities and lower incidences of foot and hock lesions than pellet treatments at d 38(Ph reduced CP had lower incidence of foot lesions at d 38(Phad higher ADFI,ADG,and final BW,improved feed conversion ratio(FCR),and heavier carcasses(Phan those fed mash diets over a production period of 39 *** could not be maintained when birds were fed L CP pelleted *** study demonstrated that,with the supplementation of AA to meet requirements,the concentration of dietary CP can be reduced to 187.5 and 180.0 g/kg in the grower and finisher phases respectively,without impairing broiler performance,meat yield and *** diets were favorable when considering the overall litter quality and welfare of the ***,they could not maintain the same broiler performance and slaughter yield as pelleted *** from the present study may assist the poultry sector towards a socially acceptable lowemission

关键词： Broiler Ammonia Crude protein Feed form Performance

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疼痛管理模式下不同绷带包扎时间对全膝关节置换术后患者早期功能恢复的影响

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中国医药指南 2024年第1期22卷 7-9页

作者：巴婕姚晓红曾惠玲刘琼王艳琪中山市中医院骨三科中山528400

目的研究疼痛管理模式下不同绷带包扎时间对全膝关节置换术后患者早期功能恢复的影响。方法选择2022年6月至2023年5月单侧全膝关节置换手术(TKA)患者80例,根据弹力绷带使用时间,24 h为对照组(40例),48 h为研究组(40例);观察两组围手术... 详细信息

目的研究疼痛管理模式下不同绷带包扎时间对全膝关节置换术后患者早期功能恢复的影响。方法选择2022年6月至2023年5月单侧全膝关节置换手术(TKA)患者80例,根据弹力绷带使用时间,24 h为对照组(40例),48 h为研究组(40例);观察两组围手术期术侧下肢的周径、膝关节功能、伤口并发症、相关不良反应,随访期间步速、步频、步幅。结果术后7 d、14 d大腿、膝关节、小腿周径均短于对照组;术后7 d、30 d膝关节活动度(ROM)屈、伸均大于对照组,膝关节功能评分(hSS)高于对照组;术后3个月两组均出现好转,研究组步速、步频、步幅均高于对照组(P0.05)。结论全膝关节置换术后患者在疼痛管理模式下,使用48 d弹力绷带,能够减轻术肢肿胀,增加肢体的屈伸活动,有利于膝关节功能恢复。

关键词：疼痛不同绷带包扎时间全膝关节置换功能恢复

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Effect of Cerium Doping on Microstructure and Dielectric Properties of baTiO_3 Ceramics

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journal of Materials Science & Technology 2011年第8期27卷 759-763页

作者： Sabina Yasmin Shamima Choudhury M.A. hakim A.h. Bhuiyan M.j. Rahman Department of Physics University of Dhaka Materials Science Division Atomic Energy Centre Department of Physics Bangladesh University of Engineering and Technology

A solid state reaction method was used to synthesize barium titanate （BT） and barium cerium titanate （BCT） ceramics at sintering temperature of 1473 K for 4 h. The effect of cerium （Ce） on the structure, microstructure and dielectric properties of BCT was investigated. The scanning electron microscopy （SEM） investigations revealed that the grain size increases with increasing Ce content. The X-ray diffraction （XI^D） patterns showed mostly the BT phase, where the lattice parameter decreased with the addition of Ce. The temperature dependence of dielectric constant showed decrease in the phase transition temperature with higher Ce content. The dielectric constant decreased slightly with increasing frequency. The direct current （dc） density-voltage characteristics of the ceramics showed ohmic behavior for both the BT and BCT. As the temperature increased, the dc resistivity of the ceramics decreased. The activation energy increased with increasing Ce content.

关键词： Cerium doped ba1-xCexTiO3 Dielectric constant Current density

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SR8278改善时差所致小鼠泪腺功能紊乱的转录组学分析

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眼科新进展 2024年第4期44卷 264-269页

作者：黄深振齐迪裴晓婷路顶立司宏丽黄杜鎏睿张文潇巴梦茹轩书婷李志杰郑州大学人民医院河南省人民医院河南大学人民医院河南省立眼科医院河南省眼科研究所河南省郑州市450003

目的探讨核受体亚家族1 D组成员1(NR1D1)合成拮抗剂SR8278在改善时差诱导的小鼠眶外泪腺结构和功能损伤方面的作用及其机制。方法 36只健康的8~10周龄野生型C57BL/6j小鼠在12 h光照/12 h黑暗循环的昼夜节律箱内适应2周后随机分为3组:... 详细信息

目的探讨核受体亚家族1 D组成员1(NR1D1)合成拮抗剂SR8278在改善时差诱导的小鼠眶外泪腺结构和功能损伤方面的作用及其机制。方法 36只健康的8~10周龄野生型C57BL/6j小鼠在12 h光照/12 h黑暗循环的昼夜节律箱内适应2周后随机分为3组:正常组(12 h光照/12 h黑暗循环的昼夜节律箱饲养)、时差组(8 h前移的12 h光照/12 h黑暗循环的昼夜节律箱饲养)及时差+SR8278组(8 h前移的12 h光照/12 h黑暗循环的昼夜节律箱饲养,并给予25 mg·kg^(-1)的SR8278干预),每组12只,共干预5 d。干预结束后,收集各组小鼠的活动度和核心体温,记录小鼠的泪液分泌量,并对泪腺组织进行称重和泪腺细胞大小测量。采用免疫组织化学方法对小鼠眶外泪腺进行组织学评估。提取泪腺RNA进行包含NR1D1的高通量RNA-Seq分析,并对获得的转录组数据进行KEGG和GO功能富集分析。结果与正常组相比,时差组小鼠白天活动度较高,夜间活动度较低,白天核心体温较高,夜间核心体温较低,差异均有统计学意义(均为Ph信号通路。结论 SR8278通过靶向抑制NR1D1,有效增强了时差小鼠的泪液分泌功能,其过程可能是通过Notch信号通路完成的。

关键词：时差 SR8278 泪腺功能紊乱小鼠

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baTiO3 solid solutions co-doped with Gd3+ and Eu3+:Synthesis,structural evolution and dielectric properties

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journal of Rare Earths 2024年第10期42卷 1920-1926页

作者： R.Martínez-López M.Pérez-Labra j.A.Romero-Serrano F.R.barrientos-hernández M.Reyes-Pérez M.I.Valenzuela-Carrillo G.Urbano-Reyes V.E.Reyes-Cruz G.I.Dávila-Pulido Academic Area of Earth Sciences and Materials Autonomous University of Hidalgo State Metallurgy and Materials Department ESIQIE-IPNUPALM Autonomous University of Coahuila Boulevard Adolfo López Mateos S/n

In this paper,the synthesis,structural evolution,and dielectric properties of baTiO3solid solutions codoped with rare earth elements(Gd3+and Eu3+) prepared using the solid-state reaction method are *** pure precursor powders of baCl3,TiO2,Gd2O3,and Eu2O3were mixed in stoichiometric proportions,ground in an agate mortar before being uniaxially pressed at 250 MPa and sintered at 1300℃ in air atmosphere for 6 h to obtain ba1-3xGd2xTi1-3xEu4xO3（x=0,0.0015,0.01 and0.1）.X-ray diffraction（XRD） and Rietveld's refinement results reveal the crystal phase ferroelectric tetragonal baTiO3for the samples with x=0,0.0015 and 0.01, as well as a consistent increment in the lattice parameters caused by the *** solubility limit of Gd3+and Eu3+in the baTiO3structure is reached for the sample with x>0.01,and the orthorhombic Eu2TiO5and monoclinic baTi2O5secondary phases were *** Raman results show the characteristic peaks of ferroelectric tetragonal baTiO3around 716 cm-1（LO of A1 symmetry）,515 cm-1（TO of A1 symmetry）,and 305 cm-1（B1）.The maximum relative permittivity measured at 1 khz was recorded to be 6151.8 for the sample with x=0.0015,and a decrease in the Curie temperature to 105℃ with respect to the undoped sample was *** punctual microanalysis for the samples with x=0.0015,0.01,and 0.1 reveals grains composed of ba,Ti,O,Gd,and Eu homogeneously distributed in the *** ba/Ti ratios for samples with x=0.0015,0.01 and 0.1 are 2.86,2.91,and 0.68,respectively,indicating substitution at the Ti site for samples with x=0.0015 and 0.01 and a substitution at the ba site for the sample with x=0.1.

关键词： baTiO3 Doping Europium Gadolinium Rare earths Synthesis

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hybrids of gold nanoparticles and oligo(p-phenyleneethynylene)s end-functionalized with alkynylruthenium groups:Outstanding two-photon absorption in the second biological window

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Nano Research 2020年第10期13卷 2755-2762页

作者： Cristóbal Quintana Mahbod Morshedi jun Du joseph P.L.Morrall jan K.Zaręba Marek Samoc Marie P.Cifuentes Mark G.humphrey I Research School of Chemistry Australian National UnriversityCanberraACT 2601Australia Advanced Materials Engineering and Modelling Group Wroclaw University of Science and TechnologyWroclaw 50370Poland

Oligo(p-phenyleneethynylene)s(OPEs)end-capped with(alkynyl)bis(diphosphine)ruthenium and thiol/thiolate groups stabilize ca.2 nm diameter gold nanoparticles(AuNPs).The morphology,elemental composition and stability of the resultant organometallic OPE/AuNP hybrid materials have been defined using a combination of molecular-and nano-material chacterization *** hybrids display long-term stability in solution(more than a month),good solubility in organic solvents,reversible rutheniumcentered oxidation,and transparency beyond 800 nm,and possess very strong nonlinear absorption activity at the first biological window,and unprecedented two-photon absorption activity in the second biological window(σ2 up to 38,000 GM at 1,050 nm).

关键词： gold nanoparticles inorganic materials metal alkynyl complexes nonlinear optics organometallics

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