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Graphene-aluminum nitride NEMS resonant infrared detector

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Microsystems & Nanoengineering 2016年第1期2卷 181-187页

作者： Zhenyun Qian Yu Hui fangze liu Sungho Kang Swastik Kar Matteo Rinaldi Department of Electrical and Computer Engineering Northeastern UniversityBostonMA 02115USA Department of Physics Northeastern UniversityBostonMA 02115USA Los Alamos National Laboratory Los AlamosNM 87545USA

The use of micro-/nanoelectromechanical resonators for the room temperature detection of electromagnetic radiation at infrared frequencies has recently been investigated,showing thermal detection capabilities that could potentially outperform conventional *** scaling of the device thickness in the nanometer range and the achievement of high infrared absorption in such a subwavelength thickness,without sacrificing the electromechanical performance,are the two key challenges for the implementation of fast,high-resolution micro-/nanoelectromechanical resonant infrared *** this paper,we show that by using a virtually massless,high-electrical-conductivity,and transparent graphene electrode,floating at the van der Waals separation of a few angstroms from a piezoelectric aluminum nitride nanoplate,it is possible to implement ultrathin(460 nm)piezoelectric nanomechanical resonant structures with improved electromechanical performance(450% improved frequency×quality factor)and infrared detection capabilities(4100×improved infrared absorptance)compared with metal-electrode counterparts,despite their reduced *** intrinsic infrared absorption capabilities of a submicron thin graphene–aluminum nitride plate backed with a metal electrode are investigated for the first time and exploited for the first experimental demonstration of a piezoelectric nanoelectromechanical resonant thermal detector with enhanced infrared absorptance in a reduced ***,the combination of electromagnetic and piezoelectric resonances provided by the same graphene–aluminum nitride-metal stack allows the proposed device to selectively detect short-wavelength infrared radiation(by tailoring the thickness of aluminum nitride)with unprecedented electromechanical performance and thermal *** attributes potentially lead to the development of uncooled infrared detectors suitable for the implementation of high performance,miniaturized and power-efficient mul

关键词： aluminum nitride graphene infrared detector MEMS NEMS piezoelectric resonant sensor

Ultrathin PtRu Nanowires as Efficient and Stable Electrocatalyst for Liquid Fuel Oxidation Reactions

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Energy Material Advances 2022年第1期2022卷 223-230页

作者： Kun Yin Yuguang Chao Lingyou Zeng Menggang Li fangze liu Shaojun Guo Hongbo Li Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Peking UniversityBeijing 100871China

Direct liquid fuel cells(DLFCs)are promising clean energy conversion devices for their high energy density,low environmental pollution,and convenient transportation and ***,the commercialization of DLFCs is still limited by the lack of highly active and stable catalysts for the anodic oxidation of liquid ***,a new class of ultrathin PtRu nanowires(NWs)with a diameter of 1.1nm was synthesized via a colloidal chemistry *** as-made ultrathin PtRu NWs can not only expose large active sites but also enhance the kinetics of methanol oxidation reaction,which was confirmed by the in situ Fourier transform infrared(FTIR)***,ultrathin PtRu NWs exhibit greatly boosted activity and stability for methanol and ethanol oxidation reactions in an alkaline medium.

关键词： spectroscopy. methanol catalyst

Light-Emitting Diodes Based on Two-Dimensional Nanoplatelets

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Energy Material Advances 2022年第1期2022卷 320-343页

作者： Yating Guo Feng Gao Pan Huang Rong Wu Wanying Gu Jing Wei fangze liu Hongbo Li Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green ApplicationsExperimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Sciences Beijing Institute of TechnologyBeijing 100081China

Colloidal semiconductor nanocrystals(NCs)attract significant interest in recent years due to their narrow and tunable emission wavelength in the visible range,as well as high photoluminescence quantum yield(PLQY),which are highly desired in display *** high-quality NCs have been recognized as vital luminescent materials in realizing next-generation display *** further development,NCs with near-unity PLQY have been successfully synthesized through engineering of the core/shell ***,as the external quantum efficiency(EQE)of the nanocrystal light-emitting diodes(LEDs)approaches the theoretical limit of about 20%,the low out-coupling factor proposes a challenge of enhancing the performance of a device when using the spherical ***,the anisotropic NCs like nanoplatelets(NPLs)are proposed as promising solutions to improve the performance of nanocrystal *** this review,we will summarize the synthetic strategies of twodimensional(2D)NPLs at ***,we will introduce fundamental concepts of LEDs,the main approaches to realize LEDs based on nanoplatelets,and the recent ***,the challenges and opportunities of LEDs based on anisotropic NCs are also presented.

关键词： tunable quantum anisotropic

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微能源网多能源耦合枢纽的模型搭建与优化

电力系统自动化 2018年第14期42卷 91-98页

作者：刘方泽牟龙华张涛朱彤同济大学电子与信息工程学院上海市201804 同济大学机械与能源工程学院上海市201804

多能源耦合枢纽作为微能源网的核心部件,其系统模型的准确性将影响微能源网的运行效率。文中针对一种包含太阳能和风能发电系统、储能系统、有机朗肯循环系统、传统冷热电三联供系统的多能源耦合枢纽,综合考虑负荷需求、价格因素和环境... 详细信息

多能源耦合枢纽作为微能源网的核心部件,其系统模型的准确性将影响微能源网的运行效率。文中针对一种包含太阳能和风能发电系统、储能系统、有机朗肯循环系统、传统冷热电三联供系统的多能源耦合枢纽,综合考虑负荷需求、价格因素和环境因素,以系统运行成本、一次能源消耗量和碳排放量最小化为目标,建立了微能源网中多能源互补的多目标优化模型;采用粒子群算法对发电机和储能的运行策略进行求解,得到最优目标。最后,与微电网进行对比分析,验证了多能耦合系统在提高能源利用率和减少碳排放方面的优势。

关键词：微能源网多能源互补能源互联网有机朗肯循环

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微能源网信息物理系统模型及其协调控制

电力系统保护与控制 2018年第17期46卷 16-23页

作者：刘方泽牟龙华何楚璇同济大学电气工程系上海201804

能源互联网系统对物理与信息的协同调控技术要求不断提高,信息物理融合系统可以很好地解决此类问题。在微能源网和信息物理系统的基础上,提出了一种微能源网信息物理系统的基本构架。在物理层面,建立了能源网络模型和能源耦合模型。在... 详细信息

能源互联网系统对物理与信息的协同调控技术要求不断提高,信息物理融合系统可以很好地解决此类问题。在微能源网和信息物理系统的基础上,提出了一种微能源网信息物理系统的基本构架。在物理层面,建立了能源网络模型和能源耦合模型。在信息层面,将电力系统的统一信息模型扩展到能源领域,建立起信息系统模型。对有时滞的微能源网信息物理系统,使用一致性理论对其协调控制,并进行了仿真验证。仿真结果证明了信息时滞对物理系统运行的影响以及一致性理论对系统协调控制的有效性。

关键词：微能源网信息物理系统分布式能源信息系统模型一致性协调控制

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社会长期护理保险对医疗服务及费用的影响——基于福利多元主义理论的实证研究

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上海城市管理 2024年第4期33卷 43-52页

作者：刘方泽华东理工大学

为了缓解人口老龄化带来的冲击和失能老人家庭养老所引发的一系列问题,长期护理保险作为一项重要的工具被提出和实施。长期护理保险实施的意义在于为受保险对象及其家庭提供更加合适的医疗服务、减轻医疗费用负担。因此,长期护理保险对... 详细信息

为了缓解人口老龄化带来的冲击和失能老人家庭养老所引发的一系列问题,长期护理保险作为一项重要的工具被提出和实施。长期护理保险实施的意义在于为受保险对象及其家庭提供更加合适的医疗服务、减轻医疗费用负担。因此,长期护理保险对于个人及家庭医疗服务及其费用所起到的替代作用就显得十分重要。通过利用2013年、2015年、2018年CHARLS数据库,结合倾向匹配模型(PSM)和双重差分法(DID),基于福利多元主义理论对长期护理保险对12个试点城市中老年人医疗服务与费用的实际影响展开了研究。研究结果证明了长期护理保险对门诊次数、门诊费用及住院费用具有显著的替代效应,但对住院次数的影响并不显著。

关键词：长期护理保险福利多元主义替代效应医疗服务医疗费用

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基于金属卤化钙钛矿的X射线探测与成像

中国材料进展 2023年第3期42卷 215-227页

作者：吴蓉刘方泽鲍雨春李红博北京理工大学材料学院北京100081

X射线探测技术广泛应用于医疗诊断、安检和质量检测等无损探测领域。金属卤化钙钛矿因具备易于制备、低缺陷密度、高电阻率和高载流子迁移率-寿命乘积等性质而成为理想的X射线吸收材料。首先从X射线与半导体吸收材料相互作用的物理机制... 详细信息

X射线探测技术广泛应用于医疗诊断、安检和质量检测等无损探测领域。金属卤化钙钛矿因具备易于制备、低缺陷密度、高电阻率和高载流子迁移率-寿命乘积等性质而成为理想的X射线吸收材料。首先从X射线与半导体吸收材料相互作用的物理机制、探测器结构和评价指标出发,分析了金属卤化钙钛矿作为X射线探测吸收材料的优势,进一步介绍了面向X射线探测的金属卤化钙钛矿的合成方法。总结了近年来基于金属卤化钙钛矿的X射线探测的重要研究进展,并围绕如何提升灵敏度和检测限开展了系统的讨论。同时,还介绍了X射线探测器与读出电路的集成方式和近年来X射线成像的研究进展。最后,展望了基于金属卤化钙钛矿的X射线探测与成像未来发展面临的挑战和方向。

关键词： X射线探测器金属卤化钙钛矿辐射成像灵敏度

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混合像元分解在石漠化信息提取中的应用进展

科技创新与应用 2023年第5期13卷 29-32页

作者：刘芳泽郭晓飞王琛西南林业大学生态与环境学院昆明650224 云南农业大学水利学院昆明650201

为有效实现石漠化信息提取,概括性地从像元级和亚像元级2方面介绍石漠化信息的遥感提取方法,重点介绍混合像元分解技术的数据源、端元提取方法、模型算法及结果应用,结果表明,混合像元分解技术能较好地解决混合像元问题,为利用非线性混... 详细信息

为有效实现石漠化信息提取,概括性地从像元级和亚像元级2方面介绍石漠化信息的遥感提取方法,重点介绍混合像元分解技术的数据源、端元提取方法、模型算法及结果应用,结果表明,混合像元分解技术能较好地解决混合像元问题,为利用非线性混合像元分解模型开展石漠化信息提取提供参考。

关键词：石漠化像元级亚像元级混合像元分解模型信息提取

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Doping strategy on improving the overall cathodic performance of double perovskite LnBaCo_(2)O_(5+σ)(Ln=Pr,Gd)as potential SOFC cathode materials

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Journal of Materiomics 2023年第5期9卷 825-837页

作者： fangze Chen Dacheng Zhou Xueqing Xiong Juntao Pan Donglin Cai Ze Wei Xiyong Chen Yihui liu Nengneng Luo Jialin Yan Toyohisa Fujita State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi UniversityNanning530004GuangxiChina School of Resources Environment and MaterialsGuangxi UniversityNanning530004GuangxiChina Hubei Key Laboratory of Advanced Technology for Automotive Components&Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan430070HubeiChina

A series of single-phase double perovskite Pr1-xGdxBaCo_(2)-yFeyO_(5+σ)(x=0,0.5 and 1,0≤y≤1)materials were engineered through A/B site co-doping strategy to improve the mechanical,electrical and electrochemical properties as potential cathode materials for the application of intermediate solid oxide fuel cells(IT-SOFCs).The corresponding thermochemical stability,thermal expansion behavior,electrical conductivity and cathodic polarization resistance of the materials were systematically *** was found that the A-site dual lanthanide doped Pr_(0.5)Gd_(0.5)BaCo_(2)O_(5+σ)(PGBCO)exhibits improved electrical conductivity,reduced thermal expansion,and comparatively low electrochemical polarization resistance versus single lanthanide double perovskite,PrBaCo_(2)O_(5+σ)(PBCO)and GdBaCo_(2)O_(5+σ)(GBCO)*** investigation on the effect of B-site Fe-doping on Pr_(0.5)Gd_(0.5)BaCo_(2)-yFeyO_(5)+σ(PGBCF-y,0≤y≤1)reveals that all the PGBCF-y compositions exhibit excellent chemical stability with Gd-doped ceria(GDC)at operating temperatures not higher than 1100℃.Besides,doping of Fe in B-site can effectively reduce the thermal expansion coefficients(TECs)of the Pr_(0.5)Gd_(0.5)BaCo_(2)O_(5)+σceramics at 30e1000℃.And the electrochemical impedance spectra(EIS)results show that the PGBCF-y|GDC|PGBCF-y symmetric cells have acceptable low area specific polarization *** examination of the cathodic polarization and characteristic capacitance from the AC impedance spectra by employing the relaxation time distribution(DRT)method demonstrated that charge transfer is the dominating subprocess for the oxygen transport through the materials.

关键词： Double perovskite Electrical conductivity Thermal expansion Electrochemical polarization Thermochemical stability