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Denitrification performance and sulfur resistance mechanism of Sm-Mn catalyst for low temperature NH_(3)-SCR

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Frontiers of Chemical Science and Engineering 2023年第5期17卷 617-633页

作者： Junlin Xie Yanli Ye qinglei li Tianhong Kang Sensheng Hou Qiqi Jin Feng He De Fang State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Center for Materials Research and Analysis Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

MnO_(x)and Sm–Mn catalysts were prepared with the coprecipitation method,and they showed excellent activities and sulfur resistances for the selective catalytic reduction of NO_(x)by NH_(3)between 50 and 300℃in the presence of excess oxygen.0.10Sm–Mn catalyst indicated better catalytic activity and sulfur resistance.Additionally,the Sm doping led to multi-aspect impacts on the phases,morphology structures,gas adsorption,reactions process,and specific surface areas.Therefore,it significantly enhances the NO conversion,N_(2)selectivity,and sulfur resistance.Based on various experimental characterization results,the reaction mechanism of catalysts and the effect of SO_(2)on the reaction process about the catalysts were extensively explored.For 0.10Sm–Mn catalyst,manganese sulfate and sulfur ammonium cannot be generated broadly under the influence of SO_(2)and the amount of surface adsorbed oxygen.The Bronsted acid sites strengthen significantly due to the addition of SO_(2),enhancing the sulfur resistance of the 0.10Sm–Mn catalyst.

关键词： MnO_(x) Sm–Mn catalyst NH_(3)-SCR sulfur resistance

基于产品数字孪生体的智能制造价值链协同研发框架构建

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科技管理研究 2024年第2期44卷 98-105页

作者：袁峰李清蕾邱爱莲沈阳工业大学管理学院辽宁沈阳110870

新一代信息技术环境下制造企业研发涉及更多价值主体,需要新技术推进系统集成创新和快速迭代,为全价值链的协同研发提供支持。为应对当前智能制造价值链延伸带来的研发决策离散问题,从全局角度出发,提出基于产品数字孪生体的智能制造价... 详细信息

新一代信息技术环境下制造企业研发涉及更多价值主体,需要新技术推进系统集成创新和快速迭代,为全价值链的协同研发提供支持。为应对当前智能制造价值链延伸带来的研发决策离散问题,从全局角度出发,提出基于产品数字孪生体的智能制造价值链协同研发的理念。首先在界定产品数字孪生体和智能制造价值链的内涵基础上,推演基于产品数字孪生体的智能制造价值链的逻辑机制,包括形成研发闭环、实现功能重塑。其次,将产品数字孪生体与智能制造价值链相结合,借助数字孪生体的强大整合能力,基于动态采集、模型互操作、虚实空间双向感知的系统研发要求,构建具有互联、互操作、互感知特性的智能制造价值链协同研发框架。最后,从跨时空并行协同、快速迭代、研发生态3个角度,打造基于产品数字孪生体的智能制造价值链协同研发应用场景,使分布于不同时空的智能制造各价值链主体并行协同完成产品研发,以期为智能制造企业全价值链协同研发提供参考。

关键词：产品数字孪生体智能制造全价值链产品研发多主体研发协同研发

Bias Adjustment and Analysis of Chinese Daily Historical Radiosonde Temperature Data

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Journal of Meteorological Research 2021年第1期35卷 17-31页

作者： Zhe CHEN Zijiang ZHOU Zhiquan liU qinglei li Xiaoling ZHANG National Meteorological Information Center China Meteorological AdministrationBeijing 100081China National Center for Atmospheric Research BoulderColorado 80301USA Beijing Meteorological Information Center Beijing Meteorological ServiceBeijing 100089China

The discontinuities in historical Chinese radiosonde datasets are attributed to artificial errors. In order to reflect more realistically basic conditions of the atmosphere over China and provide more reasonable radiosonde data as input to climate change analysis and to atmospheric reanalysis data assimilation systems, this paper proposes a scheme to identify breakpoints and adjust biases in daily radiosonde observations. The ongoing ECMWF Re Analysis-Interim(ERA-Interim) 12-h forecasts are used as reference series in the scheme, complemented by the ECMWF Twentieth Century Reanalysis(ERA-20 C). A series of breakpoint identification schemes are developed and combined with metadata to detect breakpoints. The Quantile-Matching(QM) method is applied to test and adjust daily radiosonde data on 12 mandatory pressure levels collected at 80 sounding stations during 1979–2013. The adjusted temperatures on mandatory levels are interpolated to significant levels for temperature adjustment on these levels. The adjustment scheme not only solves the data discontinuity problem caused by changes in observational instruments and bias correction methods, but also solves the discontinuity problem in the 1200 minus 0000 UTC temperature time series on mandatory levels at individual sounding stations. Before the adjustment, obvious discontinuities can be found in the deviation field between the raw radiosonde data and ERA-Interim reanalysis with relatively large deviations before 2001. The deviation discontinuity is mainly attributed to the nationwide upgrade of the radiosonde system in China around 2001. After the adjustment, the time series of deviations becomes more continuous. In addition, compared with the adjusted temperature data on mandatory levels over 80 radiosonde stations in China contained in the Radiosonde Observation Correction Using Reanalyses(RAOBCORE) 1.5, the dataset adjusted by the method proposed in the present study exhibits higher quality than RAOBCORE 1.5, while discontinuities still exist in the time series of

关键词： daily radiosonde temperature data mandatory levels significant levels bias adjustment

Analysis of Influencing Factors Tourists1 Purchase Decision-making Behavior in Kunming

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Journal of Finance Research 2018年第3期2卷 87-99页

作者： Bin Feng Hua Chen qinglei li Wei li School of Tourism and Geographical Science Yunnan Normal UniversityKunmingYunnan650500China Yunnan University KunmingYunnan650091China

Based on the theory of consumer behavior,this paper analyzes the current situation of tourism shopping market in Kunming,and analyzes the decision-making behavior of tourists shopping in Kunming with the questionnaire survey,and clarifies the influencing factors of the decision-making behavior of visitors to Kunming.In the future,the influencing factors of Kunming tourists'shopping decision-making behavior are combined with the current situation of Kunming's tourism shopping market.The problems of cheating-induced shopping,the high price of shopping products,the low level of tourism shopping experience and the imperfect after-sales service are analyzed.Finally,the corresponding countermeasures and suggestions are proposed from four aspects:rectifying the tourism shopping market,establishing a sound price supervision mechanism,strengthening the tourism shopping experience,and improving after-sales service.

关键词： Tourists to Kunming Tourism shopping Decision-making behavior Influencing factors

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高频探空温度和风速的质量控制方法研究

Atmospheric and Oceanic Science Letters 2021年第2期14卷 48-52页

作者： Fang Yuan Zijiang Zhou Jie liao qinglei li National Meteorological Information Center China Meteorological AdministrationBeijingChina

针对中国高分辨率探空资料,本文提出了一种计算气候学界限值的方法以满足业务中对资料进行质量控制的需求.首先在垂直方向上将整个大气划分为64层,将落在每层范围内的观测数据都收集到一起进行排序并计算百分位,在此基础上通过比较不同... 详细信息

针对中国高分辨率探空资料,本文提出了一种计算气候学界限值的方法以满足业务中对资料进行质量控制的需求.首先在垂直方向上将整个大气划分为64层,将落在每层范围内的观测数据都收集到一起进行排序并计算百分位,在此基础上通过比较不同百分位廓线值来获得气候学界限值.除了业务台站,本文还使用了TIPEX-III的探空数据来验证本方法在科学试验数据中的应用效果.评估表明,应用气候学界限值可以有效检测到业务站和试验站观测数据中的粗大误差;百分位廓线则可以清晰的体现出探空观测的整体变化特征并揭示出误差的整体分布范围.

关键词：高频探空资料质量控制方法第三次青藏高原科学试验

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普洱景迈山遗产地旅游业态布局优化研究

保山学院学报 2024年第4期43卷 65-74页

作者：潘龙宇李庆雷唐筱石晓红云南师范大学地理学部云南师范大学云南旅游产业研究院云南昆明650500

普洱景迈山地处云南省普洱市,有着深厚的少数民族文化和茶文化,但在其旅游发展过程中,已有传统旅游业态的数量、功能及品质远远不能满足旅游者需求,其次,以遗产地的特色游览、休闲娱乐、康养、研学等旅游业新要素衍生出的新业态还处于... 详细信息

普洱景迈山地处云南省普洱市,有着深厚的少数民族文化和茶文化,但在其旅游发展过程中,已有传统旅游业态的数量、功能及品质远远不能满足旅游者需求,其次,以遗产地的特色游览、休闲娱乐、康养、研学等旅游业新要素衍生出的新业态还处于未开发阶段,对于游客在旅行中的“参与-收获”的体验感质量也未能达到游客预期。在文献研究、实地调研的基础上,从景观学视角出发,通过将普洱景迈山遗产地作为“基质”,村寨、古茶林等看作遗产地“斑块”,道路交通看作连接“廊道”,对其已有传统旅游业态和未来新兴旅游业态的发展分析发现,各村寨内传统旅游业态呈现出的已有传统旅游业态规模小、接待能力弱和环境差,新兴旅游业态还未成型,廊道路面和连接度不够完善导致各村寨可进入性较差,遗产地核心区域孔隙度强,虽在一定程度上能增进村寨间文化交流,但未来旅游业态发展过程中可能存在旅游产品同质化是目前景迈山业态布局中较为突出的问题,在此之上提出遗产地旅游业态的布局优化策略。

关键词：旅游业态“ 斑-廊-基”理论业态布局景迈山遗产地

A target parameter estimation method via atom-reconstruction in radar mainlobe jamming

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Journal of Systems Engineering and Electronics 2024年第2期35卷 350-360页

作者： ZHOU Bilei liU Weijian li Rongfeng CHEN Hui ZHANG liang DU qinglei li Binbin CHEN Hao Air Force Early Warning Academy Wuhan 430019China Aerospace Nanhu Electronic Information Technology Co. Ltd.Jingzhou 434000China

Mainlobe jamming(MLJ)brings a big challenge for radar target detection,tracking,and identification.The suppression of MLJ is a hard task and an open problem in the electronic counter-counter measures(ECCM)field.Target parameters and target direction estimation is difficult in radar MLJ.A target parameter estimation method via atom-reconstruction in radar MLJ is proposed in this paper.The proposed method can suppress the MLJ and simultaneously provide high estimation accuracy of target range and angle.Precisely,the eigen-projection matrix processing(EMP)algorithm is adopted to suppress the MLJ,and the target range is estimated effectively through the beamforming and pulse compression.Then the target angle can be effectively estimated by the atom-reconstruction method.Without any prior knowledge,the MLJ can be canceled,and the angle estimation accuracy is well preserved.Furthermore,the proposed method does not have strict requirement for radar array construction,and it can be applied for linear array and planar array.Moreover,the proposed method can effectively estimate the target azimuth and elevation simultaneously when the target azimuth(or elevation)equals to the jamming azimuth(or elevation),because the MLJ is suppressed in spatial plane dimension.

关键词： mainlobe jamming anti-jamming atom-reconstruction radar

N:ZnO/MoS_(2)-heterostructured flexible synaptic devices enabling optoelectronic co-modulation for robust artificial visual systems

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Nano Research 2024年第3期17卷 1902-1912页

作者： Lei Xu Wenxiao Wang Yang li Yonghui lin Wenjing Yue Kai Qian qinglei Guo Jeonghyun Kim Guozhen Shen School of Information Science and Engineering University of JinanJinan 250022China School of Microelectronics Shandong UniversityJinan 250101China Department of Electronic Convergence Engineering Kwangwoon UniversitySeoul 01897Republic of Korea School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China

With the merits of non-contact,highly efficient,and parallel computing,optoelectronic synaptic devices combining sensing and memory in a single unit are promising for constructing neuromorphic computing and artificial visual chip.Based on this,a N:ZnO/MoS_(2)-heterostructured flexible optoelectronic synaptic device is developed in this work,and its capability in mimicking the synaptic behaviors is systemically investigated under the electrical and light signals.Versatile synaptic functions,including synaptic plasticity,long-term/short-term memory,and learning-forgetting-relearning property,have been achieved in this synaptic device.Further,an artificial visual memory system integrating sense and memory is emulated with the device array,and the visual memory behavior can be regulated by varying the light parameters.Moreover,the optoelectronic co-modulation behavior is verified by applying mixed electric and light signals to the array.In detail,a transient recovery property is discovered when the electric signals are applied in synergy during the decay of the light response,of which property facilitates the development of robust artificial visual systems.Furthermore,by superimposing electrical signals during the light response process,a differentiated response of the array is achieved,which can be used as a proof of concept for the color perception of the artificial visual system.

关键词： flexible synaptic device synaptic plasticity optoelectronic synapse robust visual memory optoelectronic co-modulation artificial visual system

Dielectric polymer grafted electrodes enhanced aqueous supercapacitors

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Nano Research 2024年第3期17卷 1525-1534页

作者： Shian Dong Kunming Shi Jie Chen Yingke Zhu Hongfei li Weihang Gao Zhenli Xu qinglei liu Xingyi Huang Shanghai Key Laboratory of Electrical Insulation and Thermal Aging Department of Polymer Science and EngineeringState Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China School of Mathematical Sciences Institute of Natural Sciences and MOE−LSCShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China

Supercapacitors(SCs)have become increasingly important in electrical energy storage and delivery owing to their high power densities and long lifetimes.Aqueous SCs are promising for large-scale engineering applications because of their low cost and safety.However,the low operating voltage and low energy density of aqueous SCs severely limit their practical applications.In this study,a nanoscale dielectric layer is grafted onto a graphene electrode to achieve both a high operating voltage and enhanced capacitance.Compared with an SC without dielectric grafting,a dielectric-enhanced SC(DESC)shows a higher capacitance by 2200%.The mechanism of the capacitance enhancement can be attributed to three factors:the dielectric polarization,the ions desolvation by the dielectric,and the enhanced quantum capacitance from charge transfer and ion adsorption in the polymer molecules.In addition,a 2.5 V pouch DESC with a 1 M KCl electrolyte is confirmed to cycle up to 50,000 times with a capacitance retention of 87.5%.The DESC presents the optimal electrochemical properties after it is grafted with a 5 nm dielectric layer.This study provides new insights into the design of high-voltage and high-energy-density aqueous SCs.

关键词： supercapacitors dielectric polymer high voltage capacitance enhancement