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Low-Temperature Fabrication of Stable Black-Phase CsPbI₃ Perovskite Flexible Photodetectors Toward Wearable Health Monitoring

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NANO-MICRO LETTERS 2025年第1期17卷 1-14页

作者： Zhao, yingjie Sun, yicheng Pei, Chaoxin yin, Xing Li, Xinyi Hao, yi Zhang, mengru yuan, meng Zhou, Jinglin chen, Yu Song, Yanlin Zhengzhou Univ Coll Chem Zhengzhou 450001 Peoples R China Zhengzhou Univ Pingyuan Lab Zhengzhou 450001 Peoples R China Chinese Acad Sci Inst Chem Key Lab Green Printing Beijing 100190 Peoples R China Chinese Acad Sci Tech Inst Phys & Chem Key Lab Bioinspired Mat & Interfacial Sci Beijing 100190 Peoples R China Chinese Acad Sci Inst High Energy Phys Beijing 100049 Peoples R China

Low-temperature fabrication of black-phase CsPbI3 perovskite films is first demonstrated by using diphenylphosphinic chloride additive under 30-50 degrees C, arising from the steric effect and chloride insertion ***-area high-quality all-inorganic perovskite films with fewer defects enhanced crystallographic orientation, and excellent environmental stability is *** record performances are demonstrated for flexible wearable photodetectors with a responsivity of 42.1 A W-1, a detectivity of 1.3 x 1014 Jones, high-fidelity image, photoplethysmography sensor functions, and high mechanical stability. Flexible wearable optoelectronic devices fabricated from organic-inorganic hybrid perovskites significantly accelerate the development of portable energy, biomedicine, and sensing fields, but their poor thermal stability hinders further applications. Conversely, all-inorganic perovskites possess excellent thermal stability, but black-phase all-inorganic perovskite film usually requires high-temperature annealing steps, which increases energy consumption and is not conducive to the fabrication of flexible wearable devices. In this work, an unprecedented low-temperature fabrication of stable black-phase CsPbI3 perovskite films is demonstrated by the in situ hydrolysis reaction of diphenylphosphinic chloride additive. The released diphenyl phosphate and chloride ions during the hydrolysis reaction significantly lower the phase transition temperature and effectively passivate the defects in the perovskite films, yielding high-performance photodetectors with a responsivity of 42.1 A W-1 and a detectivity of 1.3 x 1014 Jones. Furthermore, high-fidelity image and photoplethysmography sensors are demonstrated based on the fabricated flexible wearable photodetectors. This work provides a new perspective for the low-temperature fabrication of large-area all-inorganic perovskite flexible optoelectronic devices.

关键词： In situ hydrolyzation Low-temperature processing All-inorganic perovskite Flexible photodetectors Health monitoring

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Cross-border E-commerce and China's Exports during the COVID-19 Pandemic

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China & World Economy 2024年第3期32卷 215-242页

作者： yi che.meng yuan Yan Zhang Lin Zhao School of Business East China University of Science and TechnologyChina School of Business Xiangtan UniversityChina School of Economics Shanghai University of Finance and EconomicsChina

China's exports experienced a rapid recovery after the outbreak of the 2019 COVID-19 pandemic.A primary engine was cross-border e-commerce(CBEC)trade,which bucked the downward export trend during the *** exploring the variation in the number of CBEC comprehensive pilot zones across provinces,we identified the causal impact of CBEC on exports using monthly province-product-destination data for 2019 and *** found strong and robust evidence that CBEC contributed to exports during the pandemic by promoting the expansion of incumbent exports(intensive margin)rather than through the expansion of product categories and exporting partners(extensive margin).Specifically,higher pandemic risk suppressed the role of CBEC at the intensive margin while enhancing it at the extensive *** to developed countries benefited more from CBEC,both intensively and *** with final products,a larger number of intermediate products were exported through CBEC after the outbreak of the pandemic.

关键词： China's exports COVID-19 pandemic cross-border e-commerce extensive margin of trade intensive margin of trade

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大深宽比矩形高层建筑表面脉动风压非高斯特性

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哈尔滨工业大学学报 2025年第1期57卷 46-55页

作者：袁家辉陈水福刘奕中冶南方城市建设工程技术有限公司武汉430063 浙江大学建筑工程学院杭州310058

为探究大深宽比矩形高层建筑表面脉动风压的非高斯特性,本文对深宽比为1/9~9的矩形高层建筑进行了同步测压风洞试验。基于试验结果,分析了建筑表面风压的三阶和四阶统计矩分布特性,对高层建筑各立面风压进行高斯与非高斯分布的分区;研... 详细信息

为探究大深宽比矩形高层建筑表面脉动风压的非高斯特性,本文对深宽比为1/9~9的矩形高层建筑进行了同步测压风洞试验。基于试验结果,分析了建筑表面风压的三阶和四阶统计矩分布特性,对高层建筑各立面风压进行高斯与非高斯分布的分区;研究了风压的空间相关系数与非高斯性强度的关系,提出了一种新的估算建筑侧风面平均再附长度的计算方法。结果表明:在建筑侧风面上,脉动风压服从高斯还是非高斯分布取决于测点到迎风前缘的距离;除了以往文献指出的迎风面角部、侧风面分离区和背风面风压呈现非高斯性外,再附区后面的风压也呈现出高度的非高斯性;本文提出的相关系数法在计算平均再附长度时具有良好的准确性,利用该方法获得了矩形高层建筑侧风面的平均再附长度沿高度的变化呈抛物线形状。

关键词：矩形高层建筑非高斯特性风洞试验相关系数平均再附长度

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Translocation and distribution of mercury in biomasses from subtropical forest ecosystems:evidence from stable mercury isotopes

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Acta Geochimica 2021年第1期40卷 42-50页

作者： yi Liu che-Jen Lin Wei yuan Zhiyun Lu Xinbin Feng State Key Laboratory of Environmental Geochemistry Institute of Geochemistry.Chinese Academy of SciencesGuiyangChina University of Chinese Academy of Sciences BeijingChina Center for Advances in Water and Air Quality Lamar UniversityBeaumontTXUSA College of Environment and Energy South China University of TechnologyGuangzhouChina National Forest Ecosystem Research Station AilaoshanYunnanChina

To understand its source,distribution,storage,and translocation in the subtropical forest ecosystems,mercury(Hg)concentrations and stable isotopes in forest biomass tissues(foliage,branch,bark,and trunk)were investigated at Ailao Mountain National Nature Reserve,Southwest *** total Hg(THg)concentrations in the samples show the following trend:mature foliage(57±19 ng g-1)>bark(11±4.0 ng g-1)>branch(5.4±2.5 ng g-1)>trunk(1.6±0.7 ng g-1).Using the measured THg concentrations and the quantity of respective biomasses,the Hg pools in the forest are:wood(60±26μg m-2)>bark(51±18μg m-2)>foliage(41±11μg m-2)>branch(26±8.3μg m-2).The tree biomasses displayed negativeδ202Hg(-1.83‰to-3.84‰)andΔ199Hg(-0.18‰to-0.62‰).The observedΔ200Hg(-0.08‰to 0.04‰)is not significantly from zero.AΔ199Hg/Δ201Hg ratio of 1.05 was found in tree biomasses,suggesting that mercury has undergone Hg(Ⅱ)photoreduction processes.A Hg-isotope based binary mixing model suggests that Hg in the tree biomasses mainly originated from foliage uptake of atmospheric Hg0,constituting 67%,80%,and 77%of Hg in wood,branch,and bark,*** study sheds new light on the transportation and sources of Hg in the subtropical forest ecosystems.

关键词： Hg Subtropical forest ecosystem Hg stable isotope Hg-isotope based binary mixing model

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Cable coupling response in metal cavity under X-ray irradiation

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Nuclear Science and Techniques 2024年第10期35卷 110-120页

作者： Mao-Xing Zhang Lan-Feng yuan Cui meng yi-Nong Liu Department of Engineering Physics Tsinghua UniversityBeijing 100084China College of Electrical Engineering Zhejiang UniversityHangzhou 310007China Laboratory of Particle and Radiation Imaging Ministry of EducationBeijing 100084China

This study investigates the coupling response of cables inside a metal cavity under X-ray irradiation using the finite-difference time-domain method,particle simulation method,and transmission-line equation to solve the electromagnetic field inside the cavity and load voltage at the cable terminal under X-ray *** results show that under a strong ionizing radiation environment of 1 J/cm^(2),a strong electromagnetic environment is generated inside the *** cable shielding layer terminal couples a voltage of 15.32 V,whereas the core wire terminal couples a voltage of 0.31 *** strong X-ray irradiation,the metal cavity not only fails to provide electromagnetic shielding,but also introduces new electromagnetic *** study also provides a method for reducing the number of emitted electrons by adding low-Z materials,which can effectively reduce the coupled electric field and voltage.

关键词： Ionizing radiation Metal cavity System-generated electromagnetic pulse Transmission-line model

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Modeling the quasi-periodic oscillation of Swift J1644+57

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Research in Astronomy and Astrophysics 2020年第2期20卷 31-36页

作者： meng-meng Zheng Shuang-Xi yi Fa-yin Wang yuan-Chuan Zou School of Physics and Physical Engineering Qufu Normal UniversityQufu 273165China School of Astronomy and Space Science Nanjing UniversityNanjing 210093China School of Physics Huazhong University of Science and TechnologyWuhan 430074China

A 200-second X-ray quasi-periodicity in the 2-8 ke V band from Swift J1644+57 was found by Reis et *** the onset time of quasi-periodic oscillation(QPO),we show that Swift J1644+57 is a plunging *** QPO may be related to discrete clumps from the accretion disk falling into a supermassive black hole,then the outflow in the jet may be also *** estimate the lifetime of clumps to be about several hundreds seconds and the fraction of clumpy ejecta to be about 30% from the *** other possible model involves the interface between the inflow and jet magnetosphere in the magnetically choked accretion *** and numerical simulations indicate that a magnetic Rayleigh-Taylor and Kelvin-Helmholtz unstable magnetospheric interface can produce a jet-disk QPO *** event may be the first evidence of jet-disk *** observations,the two models are comparable.

关键词： accretion accretion discs gamma-ray burst:general radiation mechanism:non-thermal

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Exponential Stability Analysis of Cohen-Grossberg Neural Networks with Time-varying Delays

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Acta Mathematicae Applicatae Sinica 2012年第1期28卷 181-192页

作者： yi-min meng Li-hong HUANG Zhao-hui yuan College of Mathematics and Econometrics Hunan UniversityChangshaHunan 410082China

In this paper, we study Cohen-Grossberg neural networks （CGNN） with time-varying delay. Based on Halanay inequality and continuation theorem of the coincidence degree, we obtain some sufficient conditions ensuring the existence, uniqueness, and global exponential stability of periodic solution. Our results complement previously known results.

关键词： neural network exponential stability periodic solution delay

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Enriched environment for offspring improves learning and memory impairments induced by sevoflurane exposure during the second trimester of pregnancy

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Neural Regeneration Research 2022年第6期17卷 1293-1298页

作者： Shao-Wei yin yi-Lin meng Chuang Li yuan Wang Department of Obstetrics Shengjing Hospital of China Medical UniversityShenyangLiaoning ProvinceChina Department of Anesthesiology Shengjing Hospital of China Medical UniversityShenyangLiaoning ProvinceChina

Studies in animals indicate that sevoflurane exposure in the second trimester of pregnancy has harmful effects on the learning and memory of *** an enriched environment can reverse the damage of sevoflurane exposure in the second trimester of pregnancy on the learning and memory of rat offspring remains *** this study,rats at 14 days of pregnancy were exposed to 3.5%sevoflurane for 2 hours and their offspring were treated with an enriched environment for 20 successive *** found that the enriched environment for offspring increased nestin and Ki67 levels in hippocampal tissue,increased hippocampal neurogenesis,inhibited glycogen synthase kinase 3βactivity,and increased the expression of cell proliferation-relatedβ-catenin and apoptosis-related Bcl-2,indicating that an enriched environment reduces sevoflurane-induced damage by increasing the proliferation of stem cells in the *** findings suggest that an enriched environment can reverse the effects of sevoflurane inhaled by rats during the second trimester of pregnancy on learning and memory of *** study was approved by the Animal Ethics Committee of Shengjing Hospital of China Medical University(approval No.2018PS07K)on January 2,2018.

关键词： apoptosis fetal learning memory neurogenesis offspring proliferation sevoflurane signal pathway

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A smart post-synthetic route towards[Fe_(2)Co_(2)]molecular capsules with electron transfer and bidirectional switching behaviors

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Science China chemistry 2021年第8期64卷 1340-1348页

作者： Lingyi meng yi-Fei Deng Shihao Liu Zhiping Zheng yuan-Zhu Zhang Department of chemistry Southern University of Science and Technology(SUSTech)Shenzhen518055China

Aldehyde groups were intentionally equipped on the cyanide-bridged[Fe_(2)Co_(2)]square molecules:{[(Tp*)Fe(CN)_(3)Co(bpy^(CHO))_(2)]_(2)-[PF_(6)]_(2)}·4MeOH(1,Tp*=hydrotris(3,5-dimethylpyrazol-1-yl)borate;bpy^(CHO)=4-formyl-4′-methyl-2,2′-bipyridine),thus providing chemical-active windows for post-modification towards desired *** this contribution,by taking advantage of efficient Schiff-base condensation between the aldehyde-substituted bipyridine derivative(bpyCHO)and alkyl diamines(H_(2)N-(CH_(2))_(n)NH_(2)),two discrete[Fe_(2)Co_(2)]compounds{[(Tp∗)Fe(CN)_(3)Co(bpy^(C=N(CH_(2))_(n)N=C)bpy)]2[PF_(6)]_(2)}⋅6DMF(2,n=5;3,n=7)were prepared,where the cyanide-bridged[Fe_(2)Co_(2)]square cores were encapsulated by the flexible alkyl ***-temperature single-crystal X-ray diffraction and magnetic studies revealed complete thermo(T_(1/2)=233 K(2)and 237 K(3))and photo-induced electron transfer event accompanying spin transition between the diamagnetic[Fe^(Ⅱ)_(LS2)Co^(Ⅲ)_(LS2)]state and the paramagnetic[Fe^(Ⅲ)_(LS2)Co^(Ⅱ)_(HS2)]state(LS,low spin;HS,high spin).In addition,the bidirectional switching between the two states was achieved with alternating laser irradiation at 808 and 532 nm at 10 K.

关键词： cyanide capsule supramolecule post-modification electron transfer bidirectional switch

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Design and optimization of low-energy transfer orbit to Mars with multi-body environment

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Science China(Technological Sciences) 2015年第10期58卷 1660-1671页

作者： LU yi LI HengNian LI JiSheng che Zheng YANG yiKang YANG yuan SUN Yang School of Electronic and Information Engineering Xi’an Jiaotong University State Key Laboratory of Astronautic Dynamics (ADL) Affiliated to Xi’an Satellite Control Center College of Aeronautics and Astronautics University of Electronic Science and Technology of China School of Aerospace Xi’an Jiaotong University

This paper discusses the problem of design and optimization of low-energy transfer orbit with multi-body environment. A new integrative method is proposed to effectively solve the problem, in which the parameterized patched manifolds in CR3BP(circular restricted three-body problems), the shape-based method with multi-body environment, the homotopic method with multi-body environment, and the low-thrust capturing and descending algorithm with multi-body environment are all included. Firstly, the parameters describing the patched manifolds in CR3 BP are optimized until the least total absolute velocity increment has been got, including the employment of the shape-based method with multi-body environment. Secondly, the low-thrust control laws of the transfer orbit are optimized employing the homotopic method with multi-body environment that transfers the fuel optimization problem to an easier energy optimization problem. Thirdly, the low-thrust descending orbit around Mars is computed using the laws proposed in this paper. As a typical example, the Earth-Mars transfer orbit design is discussed. The results showed that the parameters describing the patched manifolds could be optimized by the DE(differential evolution) algorithm effectively; the homotopic method with multi-body environment could get the optimal value that meets the first order optimality conditions; and the low-thrust descending orbit could effectively be captured by Mars and finally become a circular parking orbit around it by the hypothesis control laws proposed in this paper. It shows that the final fuel cost is much less than the optimal transfer in the patched two-body problems. In conclusion, the method proposed in this paper could effectively solve the low-energy low-thrust optimal control problem in multi-body environment for the future deep space explorations.

关键词： orbit optimization multi-body patched manifolds low-energy low-thrust

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