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Designing highly transparent cerium doped Y2O3 ceramics with high mechanical and thermal properties for UV-shielding in extreme conditions

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Journal of Advanced Ceramics 2024年第7期13卷 1032-1042页

作者： Cong Zhang Jianqi Qi Xiaolan Zhou Zhonghua lu tiecheng lu College of Physics Sichuan UniversityChengdu 610064China Key Laboratory of High Energy Density Physics of Ministry of Education Sichuan UniversityChengdu 610064China Key Laboratory of Radiation Physics and Technology of the Ministry of Education Sichuan UniversityChengdu 610064China

Ultraviolet(UV)radiation poses risks to both human health and *** response to the urgent demand for UV-shielding across various applications,extensive endeavors have been dedicated to developing UV-shielding materials spanning from wide-bandgap semiconductors to organo-inorganic composite ***,existing UV shielding materials,though suitable for daily use,cannot meet the demands of extreme *** this work,we incorporated CeO_(2)as a UV absorber into Y_(2)O_(3)transparent ceramics for *** effect of CeO_(2)concentration on the optical,mechanical,and thermal properties of Y_(2)O_(3)ceramics was systematically *** findings indicate that CeO_(2)serves not only as a UV absorber but also as an effective sintering aid for Y_(2)O_(3)transparent *** 5 at%Ce-doped Y_(2)O_(3)transparent ceramics exhibit the optimal optical quality,with in-line transmittance of~77%at 800 *** introduction of Ce shifted the UV cutoff edge of Y_(2)O_(3)transparent ceramics from 250 to 375 nm,which was attributed to the visible band absorption of Ce^(4+).This shift grants UV shielding capabilities to Y_(2)O_(3)transparent ceramics,resulting in 100%shielding for ultraviolet C(UVC,100-280 nm)and ultraviolet B(UVB,280-320 nm)and~95%shielding for ultraviolet A(UVA,320-400 nm).The service stability(optical properties)under various corrosive conditions(acid,alkali,UV irradiation,and high temperature)was investigated,confirming the excellent stability of this transparent ceramic UV-shielding material.A comparison of the performance parameters of transparent ceramics with those of traditional UV shielding materials such as glasses,films,and coatings was *** work provides innovative design concepts and an effective solution for UVshielding materials for extreme conditions.

关键词： ultraviolet(UV)-shielding transparent ceramics bandgap engineering thermal properties optical properties

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原发性胆囊副神经节瘤1例报告并文献复习

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中国普通外科杂志 2024年第2期33卷 289-294页

作者：卢永帆卢铁成魏杰潘浩宇尹亚刚王定新甘肃中医药大学第一临床医学院甘肃兰州730000 甘肃省天水市第一人民医院普通外科甘肃天水741000

背景与目的:副神经节瘤(PGL)是一种源自神经嵴外胚层的神经内分泌肿瘤,胆道系统是肾上腺外PGL的罕见部位。目前关于原发性胆囊副神经节瘤(PGP)的研究较少,多为个案报道,其临床表现和影像学特征不典型,致使术前诊断困难,易被漏诊或误诊... 详细信息

背景与目的:副神经节瘤(PGL)是一种源自神经嵴外胚层的神经内分泌肿瘤,胆道系统是肾上腺外PGL的罕见部位。目前关于原发性胆囊副神经节瘤(PGP)的研究较少,多为个案报道,其临床表现和影像学特征不典型,致使术前诊断困难,易被漏诊或误诊。笔者通过回顾1例PGP患者的诊治经过,并结合国内外相关文献报道,总结该病的临床特点、诊断和治疗方法,以期提高临床工作者对罕见部位PGL的认识。方法:回顾性分析收治的1例PGP患者的临床资料,结合国内外相关文献,探讨该病的临床特点、诊断和治疗方法。结果:患者为35岁女性,因上腹部疼痛5 d入院,腹部彩超提示胆囊内有一大小约2.6 cm×2.0 cm异常强回声,呈乳头状,基底较宽,无蒂,后方无声影,改变体位不移动,考虑腺瘤。腹部CT平扫显示胆囊底部等密度软组织肿块影,增强CT显示胆囊底部类圆形、边界清楚的软组织肿块,未侵及浆膜层,动脉期明显强化,三期强化程度等同于血管强化,考虑胆囊占位性病变,性质待排。于全麻下行腹腔镜下胆囊切除,术中快速冷冻切片考虑神经内分泌肿瘤,术后病理提示为PGP。定期随访1年,未见肿瘤复发和转移,目前继续随访中。结论:PGP是一种具有潜在复发和转移特性的良性肿瘤,该病罕见且缺乏典型的临床表现及影像学特征,术前易误诊。虽然腹部增强CT显示早期显著和持续增强的病变对诊断有一定帮助,但缺乏特异性,最终确诊需依靠病理和免疫组化。手术切除是治疗该疾病的首选方法,对局限于胆囊腔内、未侵及浆膜层及周围其他脏器组织的PGL,仅行胆囊切除即可获得较满意的效果,术后应定期随访观察。

关键词：胆囊肿瘤副神经节瘤神经内分泌肿瘤

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高熵化透明陶瓷研究进展

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硅酸盐学报 2024年第3期52卷 945-972页

作者：韩文瀚朱兴华承刚郭浩李诗睿顾博森卢开雷卢铁城叶昱成齐建起四川大学物理学院成都610064 高能量物理及技术教育部重点实验室成都610064 四川文理学院四川达州635000 辐射物理及技术教育部重点实验室成都610064 香港大学李嘉诚医学院中国香港999077

透明陶瓷作为一种具有优异理化性能的结构功能一体化材料,多年来已在诸多领域替代传统透明材料进行使用,如固态照明、高功率固体激光器、高密度屏蔽窗口、光学元件及光电器件等,而近年来高熵陶瓷的研究为透明陶瓷的进一步发展提供新思... 详细信息

透明陶瓷作为一种具有优异理化性能的结构功能一体化材料,多年来已在诸多领域替代传统透明材料进行使用,如固态照明、高功率固体激光器、高密度屏蔽窗口、光学元件及光电器件等,而近年来高熵陶瓷的研究为透明陶瓷的进一步发展提供新思路。透明陶瓷高熵化使其可利用高的构型熵来改善或提升其力、热、光学等性能,从而实现更多领域、更深层次的功能化应用。综述了作为高熵透明陶瓷潜在结构的几种陶瓷体系的结构、制备、性能和应用进展,详细介绍了当前透明陶瓷高熵化研究的现况,并对其未来的发展及应用进行展望。

关键词：透明陶瓷高熵化光功能材料

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Defect elimination to enhance photoluminescence and optical transparency of Pr-doped ceramics for self-calibrated temperature feedback windows

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Journal of Advanced Ceramics 2023年第4期12卷 681-694页

作者： Kailei lu Yucheng Ye Wenhan Han Gang Cheng Xinghua Zhu Jianqi Qi tiecheng lu College of Physics Sichuan UniversityChengdu 610064China Key Laboratory of High Energy Density Physics of Ministry of Education Sichuan UniversityChengdu 610064China Key Laboratory of Radiation Physics and Technology Ministry of EducationSichuan UniversityChengdu 610064China School of Chemistry and Chemical Engineering Sichuan University of Arts and ScienceDazhou 635000China School of Intelligent Manufacturing Sichuan University of Arts and ScienceDazhou 635000China

Pr-doped metal oxide polycrystalline transparent ceramics are highly desirable for photothermal window systems served in extreme environments;however,obtaining efficient photoluminescence(PL)together with high transparency in these ceramics is still posing serious challenges,which undoubtedly limits their ***,Pr-doped Y_(2)Zr_(2)O_(7)(YZO)transparent ceramics,as an illustrative example,are prepared by a solid-state reaction and vacuum sintering *** to the elimination of defect clusters[Pr_(Y)^(4+)-O^(2-)Pr_(Y)^(4+)]and[Pr_(Y)^(4+)-e′]without the introduction of impurities and additional defects,the fabricated YZO:Pr ceramics exhibit high transparency(74%)and efficient PL(39-fold enhanced)after air annealing plus vacuum re-annealing ***,upon 295/450 nm excitation,the emission bands(blue,green,red,and dark red)from YZO:Pr ceramics present different temperature-dependent properties due to the thermalquenching channel generated by the intervalence charge transfer(IVCT)state between Pr_(Y)^(4+)and Zr^(4+)***,a self-calibrated temperature feedback window with the same fluorescence intensity ratio(FIR)model(I_(613)/I_(503),where I represents the intensity)under different excitation light sources(295 and 450 nm)is *** developed photothermal window operated in a wide temperature range(303-663 K)shows relatively high sensitivities(absolute sensitivity(Sa)and relative sensitivity(S)reach 0.008 K^(-1)at 663 K and 0.47%K^(-1)at 363 K,respectively),high repeatability(>98%),and low temperature uncertainty(T<3.2 K).This work presents a paradigm for achieving enhanced PL along with elevated transparency of lanthanide(Ln)-doped ceramics through vacuum re-annealing treatment engineering and demonstrates their promising potential for photothermal window systems.

关键词： transparent ceramics temperature sensing Pr^(3+) luminescence enhancement vacuum annealing

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Inactivation Mechanisms of Escherichia Coli in Drinking Water Using Reactive Species Generated from a Surface Discharge

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高电压技术 2013年第9期39卷 2119-2124页

作者： LI Jie SHANG Kefeng WANG tiecheng lu Na WANG Tianwei WU Yan Institute of Electrostatics and Special Power Dalian University of Technology Dalian 116024 China

Bacterial and chemical contaminations of drinking water imperil the health of people.A reactive species injection method is presented for sterilizing drinking *** produce reactive species,a gas phase surface discharge reactor(SDR)is designed:a spiral stainless steel wire attached on the inside wall of a quartz glass tube is used as the high voltage electrode,and the drinking water is the ground *** performance and mechanisms of the method in inactivating of Escherichia coli(***)are *** results show that 500 mL ***-contaminated drinking water(108CFU/mL)is completely sterilized within 4 *** on the scanning electron microscope(SEM)analysis,there were plasma-induced cell structure damages of the *** in the sterilized water,and the damage resulted in the leakage of protein,which was proved by chemical ***,the heating effect concomitantly generated by discharge plasma does not influence *** inactivation,and the contribution of direct ultraviolet(UV)irradiation could be neglected *** ozone generated by SDR and the hydroxyl radicals(·OH)subsequently generated in drinking water play the decisive roles in *** inactivation because these reactive species cause the cell rupture.

关键词：饮用水消毒大肠杆菌表面放电型活性物种机制灭活放电等离子体扫描电子显微镜

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Uniform fabrication of Ge nanocrystals embedded into SiO2 film via neutron transmutation doping

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Progress in Natural Science:Materials International 2014年第5期24卷 226-231页

作者： Wei Liu tiecheng lu Qingyun Chen Youwen Hu Shaobo Dun Issai Shlimak Department of Physics and Key Laboratory for Radiation Physics and Technology of Ministry of Education Sichuan University School of National Defence and Technology Southwest University of Science and Technology Minerva Center and Jack and Pearl Resnick Institute of Advanced Technology Department of Physics Bar-Ilan University

Nanocrystalline74Ge embedded SiO2 films were prepared by employing ion implantation and neutron transmutation doping *** electron microscopy, energy dispersive x-ray spectroscopy, and photoluminescence of the obtained samples were measured. The existence of As dopants transmuted from74 Ge is significant to guarantee the uniformity and higher volume density of Ge nanocrystals by tuning the system’s crystallinity and activating mass transfer process. It was observed that the photoluminescence intensity of Ge nanocrystals increased first then decreased with the increase of arsenic concentration. The optimized fluence of neutron transmutation doping was found to be5.5 1017 cm 2to achieve maximum photoluminescence emission in Ge embedded SiO2 film. This work opens a route in the three-dimensional nanofabrication of uniform Ge nanocrystals.

关键词： Ge nanocrystals Ion implantation Neutron transmutation doping Photoluminescence property

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A comprehensive study on Li_(4)Si_(1-x)Ti_(x)O_(4) ceramics for advanced tritium breeders

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Journal of Advanced Ceramics 2020年第5期9卷 629-640页

作者： Yichao GONG Lin LIU Jianqi QI Mao YANG Junjie LI Hailiang WANG Hao GUO Guojun ZHANG tiecheng lu School of Materials Science&Engineering Xi’an University of TechnologyXi’an 710048China College of Physical Science and Technology Sichuan UniversityChengdu 610064China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China

Hetero-element doped lithium orthosilicates have been considered as advanced tritium breeders due to the superior *** this work,Li_(4)Si_(1-x)Ti_(x)O_(4) ceramics were prepared by proprietary hydrothermal process and multistage reactive *** reaction mechanism of Li_(4)Si_(1-x)Ti_(x)O_(4) was put *** and SEM analyses indicate that insertion of Ti leads to lattice expansion,which promotes the grain growth and changes the fracture *** compressive tests show that the crush load increases almost four times by increasing x from 0 to ***,the thermal conductivity and ionic conductivity are the best when x=0.05 and x=0.1,*** cycling stability of Li_(4)Si_(1-x)Ti_(x)O_(4) pebbles was further appraised through investigating the changes of microstructure and crush *** undergoing thermal cycling,the Li_(4)Si_(1-x)Ti_(x)O_(4) still show higher crush load compared with Li_(4)SiO_(4),despite Ti segregation in some *** x=0.05 sample exhibits excellent thermal cycling *** summary,proper amount of Ti doping can improve the crush load,thermal and ionic conductivity,and thermal cycling stability of Li_(4)SiO_(4).

关键词： tritium ceramic breeders Li_(4)Si_(1-x)Ti_(x)O_(4) solid solutions crush load conductivity thermal cycling

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The Method for Measuring the Loop Resistance and the Temperature Rise Calculation of GIS Conductor Pole

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Journal of Power and Energy Engineering 2015年第4期3卷 306-312页

作者： Li Zhou tiecheng lu Bo Zhang School of Electrical Engineering Wuhan University Wuhan China

This paper studies the method for measuring the loop resistance of GIS conductor pole based on the super capacitor producing impulse current up to several thousand amperes. This method overcomes the limitations of conventional diagnostic method. Typical GIS conductor poles are chosen. Based on FEA and lab tests, the effect of different forms of current and contact condition, relationship between the temperature of contact and the loop resistance is researched. In full- scale testing under realistic operating conditions on the new 220 kV GIS using prototype instrumentation a very good sensitivity in an early stage was obtained.

关键词： The Method for Measuring the Loop Resistance and the Temperature Rise Calculation of GIS Conductor Pole

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部分高校管理工作中存在的问题和对策建议

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中国高教研究 2010年第9期 1-4页

作者：卢铁城中国高等教育学会四川大学

我国高校在坚持党委领导下校长负责制中创造了具有中国特色的高校管理模式。但部分高校在管理工作中仍存在一些问题,如没有制定本校章程;权力过于集中,缺少对一把手的有效监督;党政分工不清,错位、缺位、越位的现象常有发生;管理上存在... 详细信息

我国高校在坚持党委领导下校长负责制中创造了具有中国特色的高校管理模式。但部分高校在管理工作中仍存在一些问题,如没有制定本校章程;权力过于集中,缺少对一把手的有效监督;党政分工不清,错位、缺位、越位的现象常有发生;管理上存在行政化倾向;对教师的考核机制和评价标准欠科学;办学考核指标体系缺乏明确规定;高校的治理和评价缺少社会的参与等。认真学习和全面贯彻《国家中长期教育改革和发展规划纲要(2010-2020年)》是解决上述问题的根本对策。制定大学章程和党委领导下校长负责制实施细则;探索办学决策权、执行权、监督权的科学分离,加强对一把手的监督;加强校风、教风、学风建设;改革校内管理模式;落实将师德表现作为教师考核、聘任和评价的首要内容;建立科学规范的办学指标体系;建立和完善公办高校理事会等,可以作为加强高校管理的切入点。

关键词：高校管理大学章程大学理事会行政化倾向

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刍议大学校长书记的治校要领

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中国高教研究 2015年第2期 34-37页

作者：卢铁城四川大学四川省高等教育学会会长四川成都610016

高校面向社会依法办学的自主权日益落实,办好大学的使命历史地落到校长、书记肩上,责任重如泰山。办好大学的关键在于校长、书记要有强烈的使命感,明确的治校方略,把握高校特点,遵循教育规律,抓好提高人才培养质量、增强科技创新实力、... 详细信息

高校面向社会依法办学的自主权日益落实,办好大学的使命历史地落到校长、书记肩上,责任重如泰山。办好大学的关键在于校长、书记要有强烈的使命感,明确的治校方略,把握高校特点,遵循教育规律,抓好提高人才培养质量、增强科技创新实力、建设高水平教师队伍、努力改善办学条件这四大任务,抓好改革、班子建设、中层干部选拔、健全规章制度、校园文化建设这五大工作,突出学府特色,坚持学术自由,为人师表,率先垂范,带领全校师生员工,加速学校科学发展,不负国家人民重托。

关键词：治校方略大学使命高校特点崇尚学术

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