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High-performance and robust high-temperature polymer electrolyte membranes with moderate microphase separation by implementation of terphenyl-based polymers

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Journal of Energy Chemistry 2024年第5期92卷 572-578页

作者： jinyuan li Congrong Yang Haojiang lin Jicai Huang Suli Wang Gongquan Sun Division of Fuel Cells and Battery Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Key Laboratory of Fuel Cells&Hybrid Power Sources Chinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100039China

Acid loss and plasticization of phosphoric acid(PA)-doped high-temperature polymer electrolyte membranes(HT-PEMs)are critical limitations to their practical application in fuel *** overcome these barriers,poly(terphenyl piperidinium)s constructed from the m-and p-isomers of terphenyl were synthesized to regulate the microstructure of the *** rigid p-terphenyl units prompt the formation of moderate PA aggregates,where the ion-pair interaction between piperidinium and biphosphate is reinforced,leading to a reduction in the plasticizing *** a result,there are trade-offs between the proton conductivity,mechanical strength,and PA retention of the membranes with varied m/p-isomer *** designed PA-doped PTP-20m membrane exhibits superior ionic conductivity,good mechanical strength,and excellent PA retention over a wide range of temperature(80–160°C)as well as satisfactory resistance to harsh accelerated aging *** a result,the membrane presents a desirable combination of performance(1.462 W cm^(-2) under the H_(2)/O_(2)condition,which is 1.5 times higher than that of PBI-based membrane)and durability(300 h at 160°C and 0.2 A cm^(-2))in the fuel *** results of this study provide new insights that will guide molecular design from the perspective of microstructure to improve the performance and robustness of HT-PEMs.

关键词： Fuel cell High-temperature polymer electrolyte membranes Microphase separation Poly(terphenyl piperidinium)s Phosphoric acid

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高海拔地区晶闸管宇宙射线失效等效加速试验研究

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中国电机工程学报 2024年第2期44卷 682-690,I0021页

作者：李尧圣张进陈中圆李金元王忠明刘杰梁红胜彭超北京智慧能源研究院北京市昌平区102209 国家电网有限公司北京市西城区100031 强脉冲辐射环境模拟与效应国家重点实验室(西北核技术研究所) 陕西省西安市710024 电子元器件可靠性物理及其应用技术重点实验室(工业和信息化部电子第五研究所) 广东省广州市511370

大气环境中的高能中子、γ射线和电磁脉冲以及空间辐射环境中的高能电子和质子等,都能造成半导体材料性质变化和器件性能蜕变以至失效,而在大气层内宇宙射线引起功率器件失效的主要原因是高能中子导致的单粒子烧毁(single event burnout... 详细信息

大气环境中的高能中子、γ射线和电磁脉冲以及空间辐射环境中的高能电子和质子等,都能造成半导体材料性质变化和器件性能蜕变以至失效,而在大气层内宇宙射线引起功率器件失效的主要原因是高能中子导致的单粒子烧毁(single event burnout,SEB)。白鹤滩—江苏±800 kV特高压直流输电工程布拖换流站位于北纬27°,东经102°,海拔2500 m。中子通量是水平面4倍以上,将导致器件的失效率大幅上升。为验证工程中8.5 kV晶闸管在额定条件下的失效率不超过100FIT,该文采用200 MeV质子源进行辐照加速试验,根据当地大气中子通量核算中子总注量,对比研究不同电压、温度对晶闸管失效率的影响规律,试验结果给出晶闸管在高海拔地区宇宙射线SEB平均失效率,为换流阀中晶闸管工作电压设计提供依据。

关键词：宇宙射线高能中子单粒子烧毁平均失效率

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基于边缘计算与区块链融合的智慧用电平台的研究与设计

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科技导报 2024年第9期42卷 26-38页

作者：杨开兴满红任刘秀陈晨刘雪萍李晋源黎晚晴李正轩云南电网有限责任公司昆明供电局昆明650011 云南电网有限责任公司信息中心昆明650011 云南云电同方科技有限公司昆明650011 南方电网数字电网集团有限公司数字企业分公司广州510000

近年来电力行业大力开展智能电网建设,新技术的融合应用成为智能电网的发展趋势。从电网用电侧实际业务需求出发,设计了基于边缘计算与区块链融合的智慧用电平台,该平台在传统平台上将区块链技术与边缘计算进行融合应用,将原有中心化的... 详细信息

近年来电力行业大力开展智能电网建设,新技术的融合应用成为智能电网的发展趋势。从电网用电侧实际业务需求出发,设计了基于边缘计算与区块链融合的智慧用电平台,该平台在传统平台上将区块链技术与边缘计算进行融合应用,将原有中心化的模式向去中心化模式转变,通过下沉采集和计算压力,减轻云端计算负荷、降低网络压力,提升用电数据采集和高效应用能力;同时用区块链技术赋能边缘计算,实现协同、安全可信和数据共享。阐述了智慧用电平台的总体技术架构以及云端、边端边缘节点、边端区块链的具体技术架构、平台逻辑架构、业务应用架构和总体数据架构。在完成平台架构设计的基础上,梳理了用电平台中智能费控、多方电费对账、智慧台区的具体业务逻辑,并提出了对应的设计方案和实现流程。该平台可以满足高实时性电费计算、用电检查、线损分析、电压质量监测等精益化用电管理需求,更好地服务于现代供电服务体系和多样互动的用电体系建设。

关键词：边缘计算区块链融合架构业务应用智慧用电

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基于量测数据的新能源电力系统区域等效惯量评估方法

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电工技术学报 2024年第17期39卷 5406-5421页

作者：马燕峰李金媛王子建赵书强郭润生河北省分布式储能与微网重点实验室(华北电力大学) 保定071003 国网朔州供电公司朔州036002

新能源发电类型、渗透率及控制方式的不同会影响电力系统实时惯量,评估惯量水平有助于提高电力系统抗扰动能力。该文在分析风电、光伏的虚拟惯性响应特性及其对电力系统频率稳定性影响的基础上,考虑负荷静态电压特性,提出一种基于量测... 详细信息

新能源发电类型、渗透率及控制方式的不同会影响电力系统实时惯量,评估惯量水平有助于提高电力系统抗扰动能力。该文在分析风电、光伏的虚拟惯性响应特性及其对电力系统频率稳定性影响的基础上,考虑负荷静态电压特性,提出一种基于量测数据的新能源电力系统区域等效惯量实时评估方法。评估结果计及发电机惯量、新能源虚拟惯量和负荷等效惯量。为了减小因扰动后频率分布特性造成的误差,从加权平均数的角度提出频率采样点的选取及区域频率的计算方法,解决了量测数据众多且获取困难的问题。通过算例验证了所提方法对传统电力系统及新能源电力系统区域等效惯量评估均具有可行性和有效性。

关键词：新能源电力系统区域等效惯量评估量测数据联络线功率虚拟惯性控制负荷静态电压特性

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GACNet: A Generative Adversarial Capsule Network for Regional Epitaxial Traffic Flow Prediction

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Computers, Materials & Continua 2020年第8期64卷 925-940页

作者： jinyuan li Hao li Guorong Cui Yan Kang Yang Hu Yingnan Zhou National Pilot School of Software Yunnan UniversityKunming650091China School of Engineering and Applied Science The George Washington UniversityWashington DC20052USA

With continuous urbanization,cities are undergoing a sharp expansion within the regional *** to the high cost,the prediction of regional traffic flow is more difficult to extend to entire urban *** address this challenging problem,we present a new deep learning architecture for regional epitaxial traffic flow prediction called GACNet,which predicts traffic flow of surrounding areas based on inflow and outflow information in central *** method is data-driven,and the spatial relationship of traffic flow is characterized by dynamically transforming traffic information into images through a two-dimensional *** introduce adversarial training to improve performance of prediction and enhance the *** generator mainly consists of two parts:abstract traffic feature extraction in the central region and traffic prediction in the extended *** particular,the feature extraction part captures nonlinear spatial dependence using gated convolution,and replaces the maximum pooling operation with dynamic routing,finally aggregates multidimensional information in capsule *** effectiveness of the method is evaluated using traffic flow datasets for two real traffic networks:Beijing and New *** on highly challenging datasets show that our method performs well for this task.

关键词： Regional traffic flow adversarial training feature extraction nonlinear spatial dependence dynamic routing

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表面活性剂残留与刺激性相关性研究

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中国洗涤用品工业 2024年第7期 72-78页

作者：何璐燕孙毅时磊李金媛张淇琦杭州赛维质量技术咨询有限公司浙江杭州310000

通过靛蓝胭脂染色法、玉米醇溶蛋白过滤称重法和人体刺激性试验测试表面活性剂残留与刺激性,分析探讨不同种类的表面活性剂的残留与刺激性。结果表明刺激性小的表面活性剂,与角蛋白结合能力越小,表面活性剂的残留越小。

关键词：表面活性剂残留刺激性靛蓝胭脂染色法玉米醇溶蛋白

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电解槽二次槽焙烧启动技术的研究与应用

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云南冶金 2024年第3期53卷 209-213页

作者：普建国居镜松何绍文李国民李金苑鹤庆溢鑫铝业有限公司云南鹤庆671507

由于存在槽内衬修复不到位、铺焦厚度、挂极未找平阳极底掌、装槽物料配比不适当、启动后期工艺参数起伏波动等问题,电解槽二次槽启动存在风险,采取了相应的技术及管理措施后,二次槽启动实现“三零”目标,寿命≥90%设计寿命。

关键词：电解槽二次槽焙烧启动物料配比启动槽管理

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Mechanism of capture section affecting an intake for atmosphere-breathing electric propulsion

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Chinese Journal of Aeronautics 2024年第1期37卷 51-63页

作者： Siyuan ZHANG jinyuan YANG Cheng li Haolin li liwei ZHANG liang DING Anbang SUN State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi’an Jiaotong UniversityXi’an 710049China China Academy of Aerospace Science and Innovation Beijing 100049China

Atmosphere-Breathing Electric Propulsion(ABEP)can compensate for lost momentum of spacecraft operating in Very Low Earth Orbit(VLEO)which has been widely concerned due to its excellent commercial *** is a key technology to improve the capture efficiency of intakes,which collect and compress the atmosphere for *** this paper,the mechanism of the capture section affecting capture efficiency is investigated by Test Particle Monte Carlo(TPMC)simulations with 3D intake *** inner surface smoothness and average collision number are determined to be key factors affecting capture efficiency,and a negative effect growth model is accordingly *** the inner surface smoothness is less than 0.2,the highest capture efficiency and its corresponding average collision number interval are independent of the capture section’s geometry and its mesh *** the inner surface smoothness is higher than 0.2,the capture efficiency will decrease by installing any capture *** on the present results,the manufacturing process and material selection are suggested to be prioritized during the intake geometry design in engineering ***,the highest capture efficiency can be achieved by adjusting the length and mesh size of the capture section.

关键词： Atmosphere-breathing electric propulsion Capture efficiency Capture section Intake Test particle Monte Carlo Very low earth orbit

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Influence of nitrogen status on fermentation performances of non-Saccharomyces yeasts:a review

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Food Science and Human Wellness 2024年第2期13卷 556-567页

作者： Jinchen li Mengmeng Yuan Nan Meng Hehe li jinyuan Sun Baoguo Sun Key Laboratory of Brewing Molecular Engineering of China light Industry Beijing Key Laboratory of Flavor ChemistryBeijing Technology&Business UniversityBeijing 100048China

Nitrogen,one of the most crucial nutrients present in grapes and musts,plays a key role in yeast activities during alcoholic *** influences are imposed on yeast growth and fermentation performances including the formation of secondary *** cerevisiae,the main yeast responsible for fermentation,has been studied extensively regarding nitrogen *** the other hand,a similar study for non-Saccharomyces yeasts,whose contributions to winemaking have gradually been acknowledged,remains to be fully explored,with a few studies being *** review starts by discussing nitrogen impacts on non-Saccharomyces yeast growth and fermentation kinetics in different case scenarios,then proceeds to summarize the nitrogen preferences of individual yeast strains with regulation mechanisms elucidated by recent *** discussions on the influences on the production of volatile compounds and proposed pathways therein are made,followed by future work suggested as the final *** summarizing the nitrogen impacts on non-Saccharomyces yeasts throughout alcoholic fermentation,this review will be helpful in obtaining a more comprehensive view on these non-conventional wine yeasts in terms of nutrient requirements and corresponding volatile *** gaps will therefore be elucidated for future research.

关键词： Non-Saccharomyces yeasts Nitrogen Fermentation kinetics Nitrogen preference Wine aroma

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High-precision simulation and experimental verification of residual stress and surface topography of cylindrical surface shot peening

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CHINESE JOURNAL OF AERONAUTICS 2024年第9期37卷 535-559页

作者： Zhao, Jiuyue Tang, jinyuan liu, Huaming Zhang, Huiyun li, Xin Ding, Han Cent South Univ State Key Lab Precis Mfg Extreme Serv Performance Changsha 410083 Peoples R China Cent South Univ Coll Mech & Elect Engn Changsha 410083 Peoples R China

Shot peening is commonly employed for surface deformation strengthening of cylindrical surface part. Therefore, it is critical to understand the effects of shot peening on residual stress and surface topography. Compared to flat surface, cylindrical surface shot peening has two significant features: (i) the curvature of the cylindrical surface and the scattering of the shot stream cause distributed impact velocities; (ii) the rotation of the part results in a periodic variation of the impact velocity component. Therefore, it is a challenge to quickly and accurately predict the shot peening residual stress and surface topography of cylindrical surface. This paper developed a high-precision model which considers the more realistic shot peening process. Firstly, a kinematic analysis model was developed to simulate the relative movement of numerous shots and cylindrical surface. Then, the spatial distribution and time-varying impact information was calculated. Subsequently, the impact information was used for finite element modeling to predict residual stress and surface topography. The proposed kinematic analysis method was validated by comparison with the discrete element method. Meanwhile, 9310 high strength steel rollers shot peening test verified the effectiveness of the model in predicting the residual stress and surface topography. In addition, the effects of air pressure and attack angle on the residual stress and surface topography were investigated. This work could provide a functional package for efficient prediction of the surface integrity and guide industrial application in cylindrical surface shot peening.

关键词： Shot peening Cylindrical surface 9310 high strength steel High-precision modeling Residual stress Surface topography FATIGUE BEHAVIOR ROUGHNESS INTEGRITY STRENGTH HARDNESS STEEL

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