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SusMat 2024年第2期4卷 41-50页

作者： Qi meng Linzhen Wu Xiaoyong Yang Ying Xiong fanpeng Kong Tao Duan State Key Laboratory of Environment-friendly Energy Materials NuclearWaste and Environmental Safety Key Laboratory of DefenseSouthwest University of Science and TechnologyMianyangSichuanChina MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage Harbin Institute of TechnologyHarbinHeilongjiangChina Department of Materials Science and Engineering KTH Royal Institute of TechnologyStockholmSweden

Re-extracting environmentally transportable hexavalent uranium from wastew-ater produced by spent fuel reprocessing using the photocatalytic technology is a crucial strategy to avoid uranium pollution and recover nuclear fuel strategic resources.Here,we have designed S-scheme 2D/0D C_(3)N_(5)/Fe_(2)O_(3)heterojunction photocatalysts based on the built-in electric field and the energy band bend-ing theory,and have further revealed the immobilization process of hexavalent uranium conversion into relatively insoluble tetravalent uranium in terms of thermodynamics and kinetics.According to the results,the hexavalent uranium removal and recovery ratios in wastewater are as high as 93.38%and 83.58%,respectively.Besides,C_(3)N_(5)/Fe_(2)O_(3)heterojunctions also exhibit satisfactory cat-alytic activity and selectivity even in the presence of excessive impurity cations(including Na^(+),K^(+),Ca^(^(2+)),Mg^(2+),Sr^(2+),and Eu^(3+))or various organics(such as xylene,tributylphosphate,pyridine,tannic acid,citric acid,and oxalic acid).It is believed that this work can provide a potential opportunity for S-scheme heterojunction photocatalysts to re-enrich uranium from spent fuel wastewater.

关键词： nuclear wastewater S-scheme heterostructure uranium recovery

Understanding of the structural evolution of catalysts and identification of active species during CO_(2) conversion

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Chinese Chemical Letters 2024年第4期35卷 17-30页

作者： Li Li fanpeng Chen Bohang Zhao Yifu Yu Department of Chemistry School of ScienceInstitute of Molecular PlusTianjin UniversityTianjin 300072China

Converting CO_(2) into value-added chemicals and fuels through various catalytic methods to lower the atmospheric CO_(2) concentration has been developed to be a crucial means to alleviate the energy shortage and ameliorate the ever-fragile environment status. However, the complexity of the CO_(2) conversion reaction and the strong reduction conditions lead to the inevitable structural evolution, making it difficult for the prior design of suitable catalytic materials. Herein, to guide the rational design of efficient catalysts,we will be centered on the thermal, electro, and photo-induced structural evolution and active species identification during the CO_(2) conversion, including the in situ/operando characterization techniques monitoring the activation, steady, and deactivation stage of the catalysts as well as the inherent restructuring mechanism towards active species. Besides, the future challenges and opportunities on the merits of combining the structural evolution with the adsorbed intermediates recognized by ultra-fast spectroscopic techniques, simultaneously, the combination of theoretical simulation and the results of in situ experiments will also be addressed. This review can not only guide the identification of real active species, but also provide an approach to design the specific active species towards CO_(2) conversion, rather than only focusing on activity, for the purpose of practical industrial application.

关键词： CO_(2) Structural evolution Active species In situ Operando

Treatment of Microalgae in Ballast Water Using Hydroxyl Radical in Accordance with the D-2 Ballast Water Discharge Standard

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高电压技术 2014年第1期40卷 232-236页

作者： meng Xiangying CHEN Cao BAI Mindong SUN Jian meng fanpeng Institute of Marine Engineering Department of PhysicsDalian Maritime University College of Environment and Ecology Xiamen University

The effect of hydroxyl radical(·OH) on microalgae in ballast water is experimentally investigated. An ?OH plasma generator, which has a thin plate discharge Ag electrode covered by two α-Al2 O3 dielectric layers, is built. The plasma generator is filled with O2 and gaseous H2 O and is powered by a homemade power supply. ?OH radicals are generated by a series of plasma reactions and then dissolved into ballast water to kill microalgae. The maximum density of the killed microalgae is about 11 000 cells per milliliter. At this density, the microalgae are not reactivated at the 48th hour and the 120th hour in the treated ballast waters, and the content of chlorophyll in these microalgae decreases by 100%. The water quality returns to a normal level after 120 hours without secondary pollution of aquatic organisms and environment. These results show that the requirements of the D-2 ballast water discharge standard defined by the International Maritime Organization(IMO) are satisfied with the proposed treatment, and that ·OH is an ideal substance for killing microalgae during ballast water replacement of ships.

关键词：压载水处理排放标准微藻羟自由基等离子体发生器国际海事组织俄亥俄州最大密度

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基于深度学习的GMAW焊接缺陷在线监测

焊接学报 2024年第3期45卷 114-119,I0009,I0010页

作者：徐东辉孟范鹏孙鹏郑旭宸程永超马志陈树君中车青岛四方车辆研究所有限公司青岛266114 中车工业研究院有限公司北京100160 北京工业大学北京100124

以轨道交通高速高铁司机室铝合金外板为载体,围绕智能焊接关键技术,针对焊接缺陷在线监测问题开展研究.借助工艺试验平台与焊接工艺卡开展焊接缺陷试验设计、批量数据采集、专家经验标定、数据库构建,采用卷积神经网络算法对不同类型数... 详细信息

以轨道交通高速高铁司机室铝合金外板为载体,围绕智能焊接关键技术,针对焊接缺陷在线监测问题开展研究.借助工艺试验平台与焊接工艺卡开展焊接缺陷试验设计、批量数据采集、专家经验标定、数据库构建,采用卷积神经网络算法对不同类型数据构建多维信息融合模型,并对融合模型进行参数优化处理,最终完成融合模型的训练、验证和测试.结果表明,训练后的融合模型比单一信息模型对焊接缺陷具有较好的识别结果,训练集和测试集的焊接缺陷监测精度分别为99.0%和88.3%,此监测系统的数据采集和模型响应总时间小于100 ms,能够满足工程化应用需求,提高机器人焊接的智能化水平,推动企业数字化转型升级.

关键词：熔化极气体保护焊深度学习多维信息融合焊接缺陷在线监测

基于OLGA的二氧化碳管道意外泄漏减压特性模拟可靠性

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安全与环境学报 2024年第6期24卷 2173-2178页

作者：裴娜孟凡鹏王靖怡于帅喻健良闫兴清中国石油天然气管道工程有限公司河北廊坊065202 大连理工大学化工学院辽宁大连116024

为探究OLGA软件能否用于模拟超临界二氧化碳管道意外泄漏减压特性这一问题,基于DN 250、长258 m的工业规模超临界二氧化碳管道意外泄漏试验,采用OLGA软件建立了与试验工况一致的模拟模型,得到50 mm、100 mm、233 mm(全口径)泄漏口径时,... 详细信息

为探究OLGA软件能否用于模拟超临界二氧化碳管道意外泄漏减压特性这一问题,基于DN 250、长258 m的工业规模超临界二氧化碳管道意外泄漏试验,采用OLGA软件建立了与试验工况一致的模拟模型,得到50 mm、100 mm、233 mm(全口径)泄漏口径时,管线内不同位置二氧化碳压力、温度随时间的变化,探讨OLGA软件模拟二氧化碳管道意外泄漏减压的可靠性。结果表明:OLGA模拟模型用于预估泄漏减压持续时间具有较好可靠性;OLGA模拟模型无法预测意外泄漏瞬间的减压波传播行为;OLGA模拟模型预测得到的泄漏口径233 mm的超临界二氧化碳泄漏压降及温降与试验结果有显著偏差;OLGA模拟模型在一定程度上能够再现泄漏口径为50 mm、100 mm时超临界二氧化碳泄漏压降及温降行为,可应用于精度要求不太高的工程预测场合。

关键词：安全工程超临界二氧化碳管道泄漏减压 OLGA软件

需求响应激励下耦合电转气、碳捕集设备的综合能源系统优化

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中国电力 2024年第4期57卷 32-41页

作者：高月芬员成博孔凡鹏王雪松华北电力大学能源动力与机械工程学院河北保定071003 华北电力大学河北省低碳高效发电技术重点实验室河北保定071003

为了充分调动用户侧柔性负荷资源,发挥氢能的低碳特性,本文提出了一种需求响应激励下耦合两阶段电转气和碳捕集设备的综合能源系统优化方法。首先,构建两阶段电转气、碳捕集、氢燃料电池和储氢罐等设备组成的氢基综合能源系统。其次,结... 详细信息

为了充分调动用户侧柔性负荷资源,发挥氢能的低碳特性,本文提出了一种需求响应激励下耦合两阶段电转气和碳捕集设备的综合能源系统优化方法。首先,构建两阶段电转气、碳捕集、氢燃料电池和储氢罐等设备组成的氢基综合能源系统。其次,结合负荷能源转换间耦合关系与调节特性,引入阶梯型需求响应激励机制并对补偿基价、区间长度、价格增长率3个参数进行自适应优化。最后,设置多种场景,用多目标灰狼算法对系统的供能侧、需求侧和阶梯型需求响应激励机制进行优化求解。结果表明,基于此方法系统运行的总成本和CO_(2)排放量都有所降低。

关键词：综合能源系统柔性负荷阶梯型需求响应激励机制电转气多目标灰狼算法

Investigation of the Oscillations in a Flare-productive Active Region

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Research in Astronomy and Astrophysics 2022年第10期22卷 180-188页

作者： fanpeng Shi Zongjun Ning Dong Li Key Laboratory of Dark Matter and Space Science Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210033China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China

We investigate the oscillations in active region(AR)NOAA 12891,which produces a C2.0 three-ribbon flare accompanying a jet on 2021 November 2.Using the data from the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory,the 5 minutes decayless kink oscillations of coronal loops were detected and they are independent of the solar flare.Based on the observed oscillations and seismological diagnostics,we estimate that the Alfvén speed and magnetic field in these coronal loops are around 466 kms^(-1) sand 7.6 G,respectively.Additionally,the flare-related jet shows its plasmoids with 1 minute periodicity same as the intensity fluctuation of nearby flare ribbon.The correlation between the intensity fluctuation of jet and that of flare ribbon indicates that their 1 minute oscillations should originate from the same reconnection process.

关键词： Sun activity-Sun oscillations-Sun UV radiation Online material animation

忆阻Sprott-R混沌系统的复杂动态分析与电路实现

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量子电子学报 2024年第1期41卷 170-183页

作者：曾繁鹏赖强赖聪华东交通大学电气与自动化工程学院江西南昌330013

基于Sprott-R三维混沌系统,提出了一个具有多稳态和调幅特性的简单四维忆阻混沌系统。首先分析了系统的稳定性,发现该系统具有无穷多个不稳定平衡点。进而利用Lyapunov指数谱、分岔图及相平面图,研究了该忆阻混沌系统的复杂动力学行为... 详细信息

基于Sprott-R三维混沌系统,提出了一个具有多稳态和调幅特性的简单四维忆阻混沌系统。首先分析了系统的稳定性,发现该系统具有无穷多个不稳定平衡点。进而利用Lyapunov指数谱、分岔图及相平面图,研究了该忆阻混沌系统的复杂动力学行为特性。研究结果表明,当系统参数发生变化时,系统会经反倍周期分岔由混沌态进入周期态;在不同初始条件下,系统能产生三种共存吸引子,分别为双混沌吸引子共存、周期极限环与混沌吸引子共存、双周期极限环共存;当初始条件变化时,系统输出四维混沌信号的幅度均发生变化。最后,对该系统进行了电路设计与仿真,验证了该忆阻混沌系统的存在性。

关键词：光电子学忆阻混沌系统共存吸引子调幅控制电路实现

Mechanistic insight into the controlled synthesis of metal phosphide catalysts from annealing of metal oxides with sodium hypophosphite

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Nano Research 2022年第12期15卷 10134-10141页

作者： fanpeng Chen Bohang Zhao mengyao Sun Cuibo Liu Yanmei Shi Yifu Yu Bin Zhang Department of Chemistry School of ScienceInstitute of Molecular PlusTianjin UniversityTianjin300072China Collaborative Innovation Center of Chemical Science and Engineering Tianjin UniversityTianjin300072China

Understanding and manipulating synthetic progress for precisely controlling the components and defects of nanomaterials is an important and challenging task in materials synthesis and nanocatalysis.Metal phosphides(MPs)have been explored as cheap advanced materials in various catalytic fields.MP materials are usually synthesized through gas-solid phosphorization reaction in a trial-to-error manner,but their formation mechanism and the origin of controlled synthesis remain unclear.Here,we combine in situ thermogravimetrc analysis-mass spectrometry(TG-MS)and quasi-in situ X-ray powder diffraction(XRD)analysis to probe the transformation mechanism from metal oxides(MOs)to MPs during the phosphorization process mediated by hypophosphite.Temperature,time,and the amount of hypophosphite are revealed as the driven forces while oxophilicity and crystallinity as the impeded forces,simultaneously control the component and defect level of a series of MP(M=Ni,Co,W,Mo,and Nb).The as-obtained WO2.9/WP is proved to be an efficient Z-scheme photocatalyst for oxidative coupling of methane with the total C2+production and C2H4 selectivity in C2+products reaching 10.75 pmolg-1 and 98.25%.Our work provides a fundamental understanding of the phosphorization treatment and thereby guides a viable synthetic route to the controlled synthesis of MOx-δ,MP,MOx-δ/MP,and MP/M heterostructured materials.

关键词： phosphorization treatment metal phosphides methodology heterostructure oxygen vacancy photocatalysis

Uncovering the degradation mechanism induced by ion-diffusion kinetics in large-format lithium-ion pouch cells

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能源化学:英文版 2023年第8期83卷 98-105,I0005页

作者： Shi Zhou Xiaohong Zhang Cong Chen Ming Chen fanpeng Kong Yingjie Qiao Jiajun Wang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering University Harbin 150001HeilongjiangChina Chongqing Research Institute of Harbin Institute of Technology Chongqing 401135China

Battery electrochemistry in an actual cell is a complicated behavior influenced by the current density,uniformity,and ion-diffusion distance,etc.The anisotropism of the lithiation/delithiation degree is usually inevitable,and even worse,due to a trend of big-size cell design,typically such as 4680 and blade cells,which accelerated a battery failure during repeat lithiation and delithiation of cathodes.Inspire by that,two big-size pouch cells with big sizes,herein,are selected to reveal the ion-diffusion dependency of the cathodes at different locations.Interestingly,we find that the LiCoO_(2) pouch cell exhibits ~5 A h loss after 120 charge-discharge cycles,but a 15 A h loss is verified in a LiNixMnyCO_(1-x)-yO_(2)(NCM) cell.Synchrotron-based imaging analysis indicates that higher ion-diffusion rates in the LiCoO_(2)than that in the LiNixMnyCO_(1-x)-yO_(2)is the determined factor for the anisotropic cathode fading,which is responsible for a severe mechanical issue of particle damage,such as cracks and even pulverization,in the cathode materials.Meanwhile,we verify the different locations at the near-tab and bottom of the electrode make it worse due to the ion-diffusion kinetics and temperature,inducing a spatially uneven electrochemistry in the big-size pouch cell.The findings give an in-depth insight into pouch cell failure and make a guideline for high-energy cell design and development.

关键词： Ah-level lithium-ion pouch cells Cathode materials lon-diffusion kinetics X-ray tomography