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Brightening heavily doped upconversion nanoparticles by tuning characteristics of core-shell structures

Journal of Rare Earths 2024年第5期42卷 947-954,I0005页

作者： Yangyang Niu zhihao bao Yuqin Gao Mengchao Guo Jingyao Liu Jinjun Shao Min Lu Ze Yuan Xiaoji Xie School of Flexible Electronics(Future Technologies)&Institute of Advanced Materials(IAM) Nanjing Tech UniversityNanjing211816China

Heavily doped upconversion nanoparticles(UCNPs)potentially have exceptional photon upconversion abilities that are promising for diverse applications,such as lasing and super-resolution ***,heavily doped UCNPs typically can only offer mediocre upconversion luminescence intensity,and there still lacks general guidelines for the design and synthesis of heavily doped ***,in order to boost the upconversion luminescence of heavily doped UCNPs,we studied the influence of characteristics of the core-shell structure on heavily doped UCNPs'upconversion *** find that some empirical guidelines derived from conventional UCNPs are not suitable for heavily doped *** NaYbF_(4):Tm@NaYF_(4) core-shell UCNPs with a high concentration of Yb_(3+)as a representative,our studies reveal that a rather thick inert NaYF4 shell is needed to protect the UCNPs from surface quenching,and the upconversion luminescence may undergo the cooperative sensitization process,which should be due to the highly concentrated Yb~(3+)*** addition,the upconversion luminescence of heavily doped NaYbF4:Tm UCNPs exhibits no obvious dependence on the type of inert ***,our results show that confining both Yb~(3+)and Tm~(3+)dopants in a thin layer(known as theδ-doping strategy)does not work well in the heavily doped ***,we propose a NaYbF_(4):Tm@NaYbF_(4)@NaYF_(4) core-shell-shell structure to enhance the luminescence of heavily doped UCNPs,by weakening the dissipation of excitation energy and strengthening the *** findings should be helpful to establish general design principles for developing the brightest possible UCNPs that can meet the requirements of various applications.

关键词： Luminescence Upconversion Nanomaterials Rare earths Lanthanide doping

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Detecting somatisation disorder via speech:introducing the Shenzhen Somatisation Speech Corpus

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Intelligent Medicine 2024年第2期4卷 96-103页

作者： Kun Qian Ruolan Huang zhihao bao Yang Tan Zhonghao Zhao Mengkai Sun Bin Hu Björn W.Schuller Yoshiharu Yamamoto Key Laboratory of Brain Health Intelligent Evaluation and Intervention Ministry of EducationBeijing Institute of TechnologyBeijing 100081China School of Medical Technology Beijing Institute of TechnologyBeijing 100081China The First School of Clinical Medicine Southern Medical UniversityGuangzhouGuangdong 510515China Department of Neurology Shenzhen University General HospitalShenzhenGuangdong 518055China Group on Language Audio&MusicImperial College LondonLondon SW72AZUK Embedded Intelligence for Health Care and Wellbeing University of AugsburgAugsburg 86159Germany Educational Physiology Laboratory Graduate School of EducationThe University of TokyoTokyo 113-0033Japan

Objective Speech recognition technology is widely used as a mature technical approach in many *** the study of depression recognition,speech signals are commonly used due to their convenience and ease of *** speech recognition is popular in the research field of depression recognition,it has been little studied in somatisation disorder *** reason for this is the lack of a publicly accessible database of relevant speech and benchmark *** this end,we introduced our somatisation disorder speech database and gave benchmark *** By collecting speech samples of somatisation disorder patients,in cooperation with the Shenzhen University General Hospital,we introduced our somatisation disorder speech database,the Shenzhen Somatisation Speech Corpus(SSSC).Moreover,a benchmark for SSSC using classic acoustic features and a machine learning model was proposed in our *** To obtain a more scientific benchmark,we compared and analysed the performance of different acoustic features,i.e.,the full ComPare feature set,or only Mel frequency cepstral coefficients(MFCCs),fundamental frequency(F0),and frequency and bandwidth of the formants(F1-F3).By comparison,the best result of our benchmark was the 76.0%unweighted average recall achieved by a support vector machine with formants F1–*** The proposal of SSSC may bridge a research gap in somatisation disorder,providing researchers with a publicly accessible speech *** addition,the results of the benchmark could show the scientific validity and feasibility of computer audition for speech recognition in somatization disorders.

关键词： Somatisation disorder Machine learning Healthcare Computer audition

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Amorphous silicon from low-temperature reduction of silica in the molten salts and its lithium-storage performance

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Chinese Chemical Letters 2021年第2期32卷 598-603页

作者： Xi Huang Xuyun Guo Yicheng Ding Run Wei Shengnan Mao Ye Zhu zhihao bao Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and EngineeringTongji University.Shanghai 200092China Department of Applied Physics Research Institute for Smart EnergyHong Kong Polytechnic UniversityHong KongChina

Amorphous silicon(a-Si) is one of the most promising anode-materials for the lithium-ion battery owing to its large capacity and superior fracture ***,a-Si is usually fabricated with the sophisticated chemical vapor deposition or pulse laser deposition in a limited *** this work,we have succes s fully pre pared a-Si spheres(~200 nm) by reducing the TiO2-coated silica spheres with Al powders in the molten salts at 300℃.The coated TiO2 layer acts as a protective layer for structural maintenance during the reduction and a precursor for *** doped Ti element may suppress the crystal growth of Si to facilitate the formation of *** observation with in-situ transmission electron microscopy(TEM) further reveals that lithiation kinetics of the synthesized a-Si is controlled by the interfacial *** Li^(+) diffusivity in a-Si determined from the observation is in the order of 10^(-14) cm^(2)/*** anode of a-Si spheres together with crystalline Si nanoparticles exhibits excellent electrochemical performance,delivering a reversible capacity of 1604 mAh/g at 4 A/g and a capacity retention of 78,3%after 500 *** low temperature reduction process reported in this study provides a low-cost method to fabricate a-Si nanostructures as high-capacity durable anode materials.

关键词： Amorphous Molten salt Lithium-ion battery Silicon anode Doping

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Conductive resilient graphene aerogel via magnesio- thermic reduction of graphene oxide assemblies

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Nano Research 2015年第5期8卷 1710-1717页

作者： Huang Tang Peibo Gao zhihao bao Bin Zhou Jun Shen Yongfeng Mei Guangming Wu Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering Tongji University 1239 Siping Road Shanghai 200092 China Department of Materials Science and Engineering Fudan University 220 Handan Road Shanghai 200433 China

Graphene aerogels are desirable for energy storage and conversion, as catalysis supports, and as adsorbents for environmental remediation. To produce graphene aerogels with low density, while maintaining high electrical conductivity and strong mechanic performance, we synthesized graphene aerogels by the magnesiothermic reduction of a freeze-dried graphene oxide （GO） self-assembly and subsequent etching of the formed MgO in acid solution. The reduced graphene oxide （rGO） aerogel samples exhibited densities as low as 1.1 mg·cm^-3. The rGO aerogel was very resilient, exhibiting full recoveryeven after being compressed by strains of up to 80%; its elastic modulus （E） scaled with density （p） as E-p^2. The rGO aerogels also exhibited high conductivities （e.g., 27.7 S·m^-1 at 3.6 mg·cm^-3） and outperformed many rGO aerogels fabricated by other reduction processes. Such outstanding properties were ascribed to the microstructures inherited from the freeze-dried GO self-assembly and the magnesiothermic reduction process.

关键词： graphene aerogel magnesiothermic reduction conductivity mechanical properties

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耐高温抽芯铆钉的研究进展

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轻合金加工技术 2024年第4期52卷 25-30页

作者：刘烨欣鲍志豪孙昂孙文韬王燕芳航天精工股份有限公司天津300300 东北大学材料科学与工程学院辽宁沈阳110819 中国航空工业集团公司沈阳飞机设计研究所辽宁沈阳110035

由于航空航天、核工业等行业对耐高温抽芯铆钉的需求量日益增加,探求合理的耐高温铆钉材料,优化抽芯铆接工艺参数,提高铆接质量和接头性能,实现耐高温抽芯铆钉的国产化势在必行。研究人员通过采用有限元模拟仿真和试验相结合的方式对耐... 详细信息

由于航空航天、核工业等行业对耐高温抽芯铆钉的需求量日益增加,探求合理的耐高温铆钉材料,优化抽芯铆接工艺参数,提高铆接质量和接头性能,实现耐高温抽芯铆钉的国产化势在必行。研究人员通过采用有限元模拟仿真和试验相结合的方式对耐高温抽芯铆钉展开研究。文章综述了近些年耐高温抽芯铆钉在铆接成形和接头性能评估方面的研究进展,明确了抽芯铆接过程,分析了各种工艺参数对铆接质量的影响,总结了耐高温抽芯铆钉现阶段存在的不足,预测了其未来的发展趋势。

关键词：耐高温抽芯铆钉铆接接头性能发展趋势

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Suppressing the metal-metal interaction by CoZn_(0.5)V_(1.5)O_(4)derived from two-dimensional metal-organic frameworks for supercapacitors

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Science China Materials 2022年第1期65卷 105-114页

作者： Fang Yuan Guohua Gao Xiaodi Jiang Wenchao Bi Yixuan Su Jingwen Guo zhihao bao Jun Shen Guangming Wu Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and EngineeringTongji UniversityShanghai 200092China College of Science University of Shanghai for Science and TechnologyShanghai 200093China

Co_(2)VO_(4) with Co tetrahedrons and octahedrons of transition metal oxides has achieved progress in electrocatalysts and ***,high metal-metal interactions make it challenging to maintain high reactivity as well as increase the conductivity and stability of *** this work,spinel-structured CoZn_(0.5)V_(1.5)O_(4) with a high specific surface area was synthesized through an ion-exchange process from the metal-organic frameworks of *** functional theory calculations indicate that the replacement of transition metal by Zn can decrease the interaction between the transition metals,leading to a downshift in the π^(∗)-orbitals(V-O)and half-filled a_(1g) orbitals near the Fermi level,thus increasing the conductivity and stability of CoZn_(0.5)V_(1.5)O_(4).As a supercapacitor electrode,CoZn_(0.5)V_(1.5)O_(4) exhibits high cycling durability(99.4% capacitance retention after 18,000 cycles)and specific capacitance(1100mFcm^(-2) at 1mAcm^(-2)).This work provides the possibility of designing octahedral and tetrahedral sites in transition metal oxides to improve their electrochemical performance.

关键词： supercapacitors metal-metal interaction octahedral tetrahedral metal-organic frameworks

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上海老城厢庆成府项目风貌保护与更新设计

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上海城市发展 2022年第3期43卷 37-44页

作者：暴智浩上海南房(集团)有限公司

近年来的城市化快速推进过程中,有不少历史街坊被成片拆除,城市的历史肌理、空间格局和历史记忆也随之消失。另一方面,随着大规模旧改任务的完成,上海城市中心的开发用地已经日益减少,每一幅住宅用地都愈显珍贵。如何协调风貌保护与住... 详细信息

近年来的城市化快速推进过程中,有不少历史街坊被成片拆除,城市的历史肌理、空间格局和历史记忆也随之消失。另一方面,随着大规模旧改任务的完成,上海城市中心的开发用地已经日益减少,每一幅住宅用地都愈显珍贵。如何协调风貌保护与住宅开发的关系,是一个值得深入探讨的重要命题。本文借助上海老城厢历史风貌区庆成府项目的前期规划过程,探讨项目规划和风貌设计的重点,以期为风貌区内类似住宅开发项目提供参考。

关键词：历史风貌区住宅开发住宅用地风貌保护风貌设计上海老城厢历史肌理前期规划

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上海市既有高层住宅消防设施更新改造技术初探

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住宅科技 2012年第7期32卷 46-48页

作者：暴智浩上海市黄浦区住房保障和房屋管理局

通过分析上海市卢湾区既有高层住宅消防设施存在的安全隐患,提出制定新的规范化管理制度、全面改造消防设施、补充更新消防设备等方案。通过一个典型的案例实践论证,认为对既有高层住宅消防设施更新、改造,是可以在一定程度上提高既有... 详细信息

通过分析上海市卢湾区既有高层住宅消防设施存在的安全隐患,提出制定新的规范化管理制度、全面改造消防设施、补充更新消防设备等方案。通过一个典型的案例实践论证,认为对既有高层住宅消防设施更新、改造,是可以在一定程度上提高既有高层住宅的消防能力,改善住宅防火安全性能和小区居住条件。

关键词：既有高层住宅消防安全改造更新

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文物保护建筑检测技术研究

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住宅科技 2022年第8期42卷 76-79页

作者：暴智浩上海南房(集团)有限公司

针对一些受到严重影响的文物保护建筑,需对其实施落架重建。文章以某文物保护建筑为例,研究文物保护建筑落架重建的检测方法,为相似工程检测提供借鉴。检测中采用三维激光扫描仪对建筑全貌和重点保护部位进行扫描,绘制平立面图和保护部... 详细信息

针对一些受到严重影响的文物保护建筑,需对其实施落架重建。文章以某文物保护建筑为例,研究文物保护建筑落架重建的检测方法,为相似工程检测提供借鉴。检测中采用三维激光扫描仪对建筑全貌和重点保护部位进行扫描,绘制平立面图和保护部位花样图纸,另采用全站仪对该建筑进行倾斜测量,并对该建筑进行安全性鉴定和抗震鉴定。

关键词：文物保护建筑检测技术落架重建三维扫描安全性鉴定

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浅议上海市住宅修缮工程实施过程中需要重视的几个方面

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住宅科技 2012年第8期32卷 56-58页

作者：暴智浩王金前上海市黄浦区住房保障和房屋管理局上海市房地产科学研究院(上海市住宅修缮工程质量检测中心)

为了完成上海市住房发展"十二五"规划中关于完成旧住房综合改造和修缮5000万m2的目标,各区(县)将进入大规模的住宅修缮工程实施过程。文章讨论了在目前住宅修缮工程领域的监督管理体系、技术标准体系等方面还不够完善的情况下,大规模实... 详细信息

为了完成上海市住房发展"十二五"规划中关于完成旧住房综合改造和修缮5000万m2的目标,各区(县)将进入大规模的住宅修缮工程实施过程。文章讨论了在目前住宅修缮工程领域的监督管理体系、技术标准体系等方面还不够完善的情况下,大规模实施住宅修缮工程需要重视的几个方面的问题。

关键词：住宅修缮工程查勘与设计监督抽检

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