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High-efficiency stretchable organic light-emitting diodes based on ultra-flexible printed embedded metal composite electrodes

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InfoMat 2023年第5期5卷 28-39页

作者： Lan-qian Yao Yue qin Xiang-Chun Li qian xue Fang Liu Tao Cheng Guan-Jun Li Xinwen Zhang Wen-Yong Lai State Key Laboratory of Organic Electronics and Information Displays(SKLOEID) Institute of Advanced Materials(IAM)Nanjing University of Posts&TelecommunicationsNanjingthe People's Republic of China Frontiers Science Center for Flexible Electronics(FSCFE) MIIT Key Laboratory of Flexible Electronics(KLoFE)Northwestern Polytechnical UniversityXi'anthe People's Republic of China

Stretchable organic light-emitting diodes(OLEDs)are important components for flexible/wearable ***,the efficiency of the existing stretchable OLEDs is still much lower as compared with their rigid counterparts,one of the main reasons being the lack of ideal flexible transparent ***,we propose and develop a printed embedded metal composite electrode(PEMCE)strategy that enables the fabrication of ultra-thin,highly flexible transparent electrodes with robust mechanical *** the flexible transparent electrodes serves as the anodes,flexible/stretchable white OLEDs have been successfully constructed,achieving a current efficiency of up to 77.4 cd A^(-1)and a maximum luminance of 34787 cd m^(-2).The current efficiency of the resulting stretchable OLEDs is the highest ever reported for flexible/stretchable white OLEDs,which is about 1.2 times higher than that of the reference rigid devices based on ITO/glass *** excellent optoelectronic properties of the printed embedded transparent electrodes and the light extraction effect of the Ag-mesh account for the significant increase in current ***,the electroluminescence performance still retains~83%of the original luminance even after bending the device 2000 cycles at a radii of~0.5 *** importantly,the device can withstand tensile strains of up to~100%,and even mechanical deformation of 90%tensile strain does not result in a significant loss of electroluminescence performance with current efficiency and luminance maintained at over 85%.The results confirm that the PEMCE strategy is effective for constructing ultra-flexible transparent electrodes,showing great promise for use in a variety of flexible/stretchable electronics.

关键词： flexible electrodes flexible electronics printed embedded metal composite electrodes stretchable OLEDs transparent electrodes

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Emerging perovskite materials for supercapacitors:Structure,synthesis,modification,advanced characterization,theoretical calculation and electrochemical performance

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Journal of Energy Chemistry 2024年第2期89卷 41-70,I0003页

作者： Yuehua qian qingqing Ruan Mengda xue Lingyun Chen Department of Applied Chemistry School of Chemistry and Chemical EngineeringChongqing UniversityChongqing 401331China

As a new generation electrode materials for energy storage,perovskites have attracted wide attention because of their unique crystal structure,reversible active sites,rich oxygen vacancies,and good *** this review,the design and engineering progress of perovskite materials for supercapacitors(SCs)in recent years is ***,the review will focus on four types of perovskites,perovskite oxides,halide perovskites,fluoride perovskites,and multi-perovskites,within the context of their intrinsic structure and corresponding electrochemical performance.A series of experimental variables,such as synthesis,crystal structure,and electrochemical reaction mechanism,will be carefully analyzed by combining various advanced characterization techniques and theoretical *** applications of these materials as electrodes are then featured for various ***,we look forward to the prospects and challenges of perovskite-type SCs electrodes,as well as the future research direction.

关键词： Perovskite Modification engineering Oxygen vacancy Theoretical calculation methodology Supercapacitor

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Local parameter identification with neural ordinary differential equations

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Applied Mathematics and Mechanics(English Edition) 2022年第12期43卷 1887-1900页

作者： qiang YIN Juntong CAI xue GONG qian DING Department of Mechanics Tianjin UniversityTianjin 300350China

The data-driven methods extract the feature information from data to build system models, which enable estimation and identification of the systems and can be utilized for prognosis and health management(PHM). However, most data-driven models are still black-box models that cannot be interpreted. In this study, we use the neural ordinary differential equations(ODEs), especially the inherent computational relationships of a system added to the loss function calculation, to approximate the governing equations. In addition, a new strategy for identifying the local parameters of the system is investigated, which can be utilized for system parameter identification and damage detection. The numerical and experimental examples presented in the paper demonstrate that the strategy has high accuracy and good local parameter identification. Moreover, the proposed method has the advantage of being interpretable. It can directly approximate the underlying governing dynamics and be a worthwhile strategy for system identification and PHM.

关键词： neural ordinary differential equation(ODE) parameter identification prognosis and health management(PHM) system damage detection

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Anchoring Mo on C_(9)N_(4) monolayers as an efficient single atom catalyst for nitrogen fixation

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Journal of Energy Chemistry 2021年第6期30卷 443-450,I0011页

作者： Zhe xue Xinyu Zhang Jiaqian qin Riping Liu State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004HebeiChina Metallurgy and Materials Science Research Institute Chulalongkorn UniversityBangkok 10330Thailand

Electrochemical nitrogen fixation via a convenient and sustainable manner,exhibits an intriguing prospect for ammonia generation under ambient ***,the design and development of high-efficiency and low-cost electrocatalysts remains the major challenge confronting nitrogen reduction reaction(NRR).Herein,anchoring the single Mo atom on the C_(9)N_(4) substrate(Mo@C_(9)N_(4)) to form an efficient single-atom catalyst(SAC) is proposed for the conversion of N2 to *** employing density functional theory(DFT) calculations,we demonstrated that gas phase N2 can be sufficiently activated and efficiently reduced to NH3 on the surface of Mo@C_(9)N_(4).Meanwhile,we found that the NRR dominantly occurred on the Mo center via a preferred distal pathway with favorable limiting potential of 0.40 ***,the as-established Mo@C_(9)N_(4) catalyst exhibits an outstanding structural stability and good selectivity toward *** findings provide a promising platform for designing Mo-based SACs for electrochemical N2 fixation.

关键词： Carbon nitride covalent compounds Electrochemical nitrogen reduction Single-atom catalyst Ammonia synthesis First-principles calculations

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Empirical Likelihood Confidence Intervals for the Differences of Quantiles with Missing Data

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Acta Mathematicae Applicatae Sinica 2009年第1期25卷 105-116页

作者： Yong-song qin Yong-jiang qian School of Mathematical Sciences Guangxi Normal University Guilin Guangxi 541004 China

Suppose that there are two nonparametric populations x and y with missing data on both of them. We are interested in constructing confidence intervals on the quantile differences of x and y. Random imputation is used.... 详细信息

关键词： Empirical likelihood confidence Interval quantile missing data imputation

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VIBRATION AND STABILITY OF VERTICAL UPWARD-FLUID-CONVEYING PIPE IMMERSED IN RIGID CYLINDRICAL CHANNEL

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Acta Mechanica Solida Sinica 2008年第5期21卷 431-440页

作者： qin qian Lin Wang Qiao Ni Department of Mechanics Huazhong University of Science and Technology Wuhan 430074 China

A theoretical model is developed for the vibration and stability of a vertical pipe subjected concurrently to two dependent axial flows. The external fluid, after exiting the outer annular region between the pipe and a rigid cylindrical channel, is conveyed upwards inside the pipe. This configuration thus resembles of a pipe that aspirating fluid. The equation of planar mo- tion is solved by means of the differential quadrature method （DQM）. Calculations are conducted for a slender drill-string-like and a bench-top-size system, for different confinement conditions of the outer annular channel. It is shown that the vibrations of these two systems are closely related to the degree of confinement of the outer annular channel. For a drill-string-like system with narrow annuli, buckling instability may occur in the second and third modes. For a bench-top-size system, however, both buckling and flutter may occur in the lowest three modes. The form of instability depends on the annuli size.

关键词： pipe conveying fluid annular flow axial flow drill-string stability critical flow velocity

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TMN4 complex embedded graphene as bifunctional electrocatalysts for high efficiency OER/ORR

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Journal of Energy Chemistry 2021年第4期30卷 437-443页

Developing highly active bifunctional electrocatalysts for oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)is of great significance in energy conversion and storage *** this study,we systematically investigated the OER/ORR electrocatalytic activity of TMN_(4)@G system by using density functional theory(DFT)***,IrN_(4)@G is a very promising bifunctional catalyst for both OER and ORR with the extremely low overpotentials of 0.30 and 0.26 V,*** outstanding electrocatalytic performance is mainly attributed to the synergistic effect of Ir and *** importantly,by constructing 2D activity volcano plots,we obtained the limiting overpotentials of TMN_(4)@G system with the values of 0.26 V for OER and 0.24 V for *** findings open up new opportunities for further exploring graphene-based materials for highly efficient OER/ORR electrocatalysts.

关键词： N-doped graphene Transition Metal-N4 cluster First-principles calculations Oxygen evolution reaction Oxygen reduction reaction

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快速气相色谱法测定汽油单体烃组成及多项物性预测模型的建立

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石油炼制与化工 2025年第1期56卷 172-180页

作者：李长秀王亚敏张祎玮王征钱钦中石化石油化工科学研究院有限公司北京100083

建立了采用40 m×0.10 mm×0.20μm超细内径非极性色谱柱、氢气作载气的快速分析汽油馏分单体烃组成的方法(简称快速单体烃分析方法)。对于催化裂化汽油C_(3)~C_(12)组分可以得到367个色谱峰,正十二烷的保留时间为30.1 min。同一样品重... 详细信息

建立了采用40 m×0.10 mm×0.20μm超细内径非极性色谱柱、氢气作载气的快速分析汽油馏分单体烃组成的方法(简称快速单体烃分析方法)。对于催化裂化汽油C_(3)~C_(12)组分可以得到367个色谱峰,正十二烷的保留时间为30.1 min。同一样品重复测定3次的结果显示组分保留时间极差小于0.02 min,保留指数极差小于0.50。对于质量分数大于0.5%的单体烃组分,含量测定结果的相对标准偏差小于6%;对于质量分数小于0.5%的单体烃组分,含量测定结果的相对标准偏差小于10%。建立了根据汽油单体烃分析结果计算汽油的密度、饱和蒸气压、折射率、碳氢元素含量、平均相对分子质量、溴值的修正计算模型。根据修正模型计算样品的密度、折射率和饱和蒸气压,计算结果与实测结果有较好的一致性。根据快速单体烃分析方法的测定结果和采用50 m×0.20 mm×0.50μm非极性色谱柱的常规单体烃分析方法的测定结果计算多项物性参数,两种方法下的计算结果一致,说明建立的计算模型也适用于采用快速单体烃分析方法的测定结果计算样品的多项物性参数。

关键词：汽油单体烃快速分析气相色谱物性参数

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Intelligent Silent Zone for Source-Location Privacy Based on Context-Awareness in WSNs

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第1期35卷 203-218页

作者： Zhou qian qin Xiaolin Ding Youwei College of Computer Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106P.R.China Jiangsu Key Laboratory of Internet of Things and Control Technology Nanjing 211106P.R.China

In many wireless sensor networks(WSNs)applications,the preservation of source-location privacy plays a critical role in concealing context information,otherwise the monitored entities or subjects may be put in *** traditional solutions have been proposed based on the creation of random routes,such as random walk and fake sources approach,which will lead to serious packet delay and high energy *** of applying the routing in a blind way,this article proposes a novel solution for source location privacy in WSNs by utilizing sensor ability of perceiving the presence a mobile attacker nearby,for patient attackers in particular to increase the safety period and decrease the data delivery *** proposed strategy forms an intelligent silent zone(ISZ)by sacrificing only a minority of sensor nodes to entice patient attackers away from real packet routing *** analysis and simulation results show that the proposed scheme,besides providing source location privacy energy efficiently,can significantly reduce real event reporting latency compared with the existing approaches.

关键词： source location privacy wireless sensor networks energy-efficiency context-aware

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LC2 and OsVIL2 Promote Rice Flowering by Photoperoid-lnduced Epigenetic Silencing of OsLF

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Molecular Plant 2013年第2期6卷 514-527页

作者： Jun Wang Jiang Hu qian qian Hong-Wei xue National Key Laboratory of Plant Molecular Genetics Institute of Plant Physiology and Ecology Shanghai Institutes for Biological Sciences Chineseacademy of Sciences Shanghai 200032 People's Republic of China State key Laboratory of Rice Biology China National Rice Research institute Hangzhou Zhejiang 310006 People's Republic of China

Proper flowering time is essential for plant reproduction. Winter annual Arabidopsis thaliana needs ver-nalization before flowering, during which AtVILs （VIN3 and VRNS, components of PRC2 complex） mediate the H3K27 tri- methylation at the FLC locus （a floral repressor） to repress the FLC expression and hence to induce flowering. However, how VILs （VIL, VERNALIZATION INSENSITIVE 3-LIKE） function in rice is unknown. Here we demonstrated that rice LC2 （OsVIL3） and OsVIL2 （two OsVILs, possible components of PRC2 complex） promote rice flowering. Our results showed that expressions of LC2 and OsVIL2 are induced by SD （short-day） conditions and both Ic2 mutant and OsVIL2-RNAi lines display delayed heading date, consistent with the reduced expression levels of Hdl and Hd3a. Interestingly, LC2 binds to the promoter region of a floral repressor OsLF and represses the OsLF expression via H3K27 tri-methylation modification. In addition, OsLF directly regulates the Hdl expression through binding to Hdl promoter. These results first demonstrated that the putative PRC2 in rice is involved in photoperiod flowering regulation, which is different from that of Arabidopsis, and revealed that LC2 binds the promoter region of target gene, presenting a possible mechanism of the recruitment pro-cess of PRC2 complex to its target genes. The studies provide informative clues on the epigenetic control of rice flowering.

关键词： epigenetic control rice flowering LC2 PRC2.

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