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In-situ TEM study of the effect of hydrogen-helium ratio on defect characteristics in Fe9Cr1.5W0.4Si F/M steel during H_(2)^(+)&He^(+)simultaneous irradiation

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Journal of Materials Science & Technology 2024年第6期173卷 192-201页

作者： dewang cui Ziqi Cao Kun He Yuanming Li Xi Qiu Guang Ran College of Energy Xiamen UniversityXiamen 361102China Fujian Provincial Nuclear Energy Engineering Technology Research Center Xiamen 361102China Science and Technology on Reactor Fuel and Materials Laboratory Chengdu 610041China Nuclear Power Institute of China Chengdu 610041China Science and Technology on Reactor System Design Technology Laboratory Chengdu 610041China

The effect of hydrogen and helium interaction,especially H-He ratio,on the irradiation behavior of nuclear materials has not yet been ***,this is an important basis for evaluating the irradiation properties of nuclear materials and developing high irradiation resistant ***,30 keV H_(2)^(+)and He^(+)dual beams with four H-He ratios of 0:10,3:10,15:10,and 30:10 were used to irradiate the newly developed Fe9Cr1.5W0.4Si F/M steel in TEM to in-situ study the interaction and ratio effect of hydrogen and *** addition of H atoms significantly promoted the nucleation of dislocation loops and *** the early stage of irradiation,the average size and density of dislocation loops increased with the increase of H-He ***,the larger the H-He ratio,the easier it was to form a complex dislocation ***,the final saturation size of bubbles increased with the increase of H-He *** was first found that the swelling was affected by H concentrations,with high H concentrations slowing down the increase in *** a certain irradiation dose,a specific H-He ratio would lead to a swelling peak of Fe9Cr1.5W0.4Si F/M *** super-sized bubbles at grain boundaries(GBs)were found after H addition,resulting in a bigger swelling of GBs than the *** the swelling of the GBs and the matrix show a dependence on the H-He *** current work is of great significance for understanding the interaction between hydrogen and helium in nuclear materials.

关键词： Dose ratio effect Ferritic-martensitic steel Hydrogen&helium synergetic irradiation In-situ TEM

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Effect of dose rate on the characteristics of dislocation loops in palladium:In-situ TEM analysis during 30 keV H_(2)^(+)irradiation

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Journal of Materials Science & Technology 2023年第19期150卷 86-95页

作者： dewang cui Ziqi Cao Yifan Ding Yipeng Li Guang Ran College of Energy Xiamen UniversityXiamen 361102China Fujian Research Center for Nuclear Engineering Xiamen 361102China

Ion irradiation is usually used to simulate neutron irradiation to accelerate the evaluation of the irradia-tion behavior of reactor ***,the validity of using a high damage rate of ion irradiation to simulate a low damage rate of neutron irradiation has always been a controversial ***,the effect of two dose rates(2.94×10^(-6) and 7.35×10^(-5) dpa s^(-1))on the characteristics and evolution of dislo-cation loops in palladium was studied in situ during 30 keV H2+irradiation using transmission electron *** dose rate obviously affected the nucleation rate and growth rate of dislocation loops,the types(Frank loops or perfect loops)of dislocation loops,and the irradiation hardening and total damage obtained from the product of average loop size and loop *** the same irradiation dose,a high dose rate would lead to high loop density,small average loop size,low loop growth rate,and low irra-diation hardening and damage induced by loops in pure ***,it was found for the first time that a high dose rate was beneficial to the generation of perfect dislocation *** effect of dose rate was attributed to the different dynamic equilibrium results between the effective generation rate of point defects and their absorption rate by existing *** present results show that the effect of dose rate should be considered when using ion irradiation to simulate neutron irradiation to evaluate the irradiation damage to materials.

关键词： Palladium Hydrogen irradiation In-situ TEM observation Dislocation loop Dose rate

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Wave Breaking in the Periodic Integrable Hunter-Saxton Equation with a Dispersive Term

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Journal of Mathematical Research with Applications 2019年第5期39卷 517-528页

作者： Ying ZHANG Ruichang PEI dewang cui School of Mathematics and Statistics Tianshui Normal University

Considered here is the periodic Cauchy problem for an integrable Hunter-Saxton equation with a dispersive term. Firstly, we derive a precise blow-up criterion of strong solutions to the equation. Secondly, sufficient conditions guaranteeing the development of breaking waves in finite time are demonstrated by applying some conservative quantities and the method of characteristics, respectively. Finally, the exact blow-up rate is determined.

关键词： Hunter-Saxton equation integrable equation blow-up wave-breaking

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基于SOR法解Poisson方程的差分方程组Wopt的选取方法

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天水师范学院学报 2008年第2期28卷 12-13页

作者：崔德旺肖中秋何万生天水师范学院数学与统计学院甘肃天水741001 兰州交通大学数学系甘肃兰州730070

提出了选取最佳松弛因子的另一公式,并给出了相关证明,而且通过求解Poisson方程及第一边值问题的差分方程组,利用MATLAB7.0编程选取了在不同阶数下的最佳松弛因子,最后与相关文献的数据进行了比较,发现采用本文所提出的公式选取最佳松... 详细信息

提出了选取最佳松弛因子的另一公式,并给出了相关证明,而且通过求解Poisson方程及第一边值问题的差分方程组,利用MATLAB7.0编程选取了在不同阶数下的最佳松弛因子,最后与相关文献的数据进行了比较,发现采用本文所提出的公式选取最佳松弛因子比使用已有公式选取收敛速度更快。

关键词：差分方程 SOR法 Wopt(最佳松弛因子)

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松辽盆地二氧化碳气层录井识别方法

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石化技术 2017年第10期24卷 114-114页

作者：崔德旺中石化华北石油工程有限公司录井分公司河南郑州450000

本文将根据松辽盆地油气田的地质现状,提出适合该地区的二氧化碳气层录井方法,并阐述该方法在松辽盆地的应用步骤。

关键词：松原盆地二氧化碳气层录井识别方法

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Efficient hydrogen production through the chemical looping redox cycle of YSZ supported iron oxides

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Green Energy & Environment 2021年第6期6卷 875-883页

作者： Li Ma Yu Qiu Min Li Dongxu cui Shuai Zhang dewang Zeng Rui Xiao Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing210096China

The chemical looping process,where an oxygen carrier is reduced and oxidized in a cyclic manner,offers a promising option for hydrogen production through splitting water because of the much higher water splitting efficiency than solar electrocatalytic and photocatalytic process.A typical oxygen carrier has to comprise a significant amount of inert support,to maintain stability in multiple redox cycles,thereby resulting in a trade-off between the reaction reactivity and ***,we proposed the use of ion-conductive yttria-stabilized zirconia(YSZ)support Fe_(2)O_(3)to prepare oxygen carriers *** obtained Fe_(2)O_(3)/YSZ composites showed high reactivity and ***,Fe_(2)O_(3)/YSZ-20(oxygen storage capacity,24.13%)exhibited high hydrogen yield of~10.30 mmol g^(-1) and hydrogen production rate of~0.66 mmol g^(-1) min^(-1) which was twice as high as that of Fe_(2)O_(3)/Al_(2)O_(3).Further,the transient pulse test indicated that active oxygen diffusion was the ratelimiting step during the redox *** electrochemical impedance spectroscopy(EIS)measurement revealed that the YSZ support addition facilitated oxygen diffusion of materials,which contributed to the improved hydrogen production *** support effect obtained in this work provides a potentially efficient route for the modification of oxygen carrier materials.

关键词： Hydrogen production Chemical looping Oxygen carriers Support effect

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Earth abundant spinel for hydrogen production in a chemical looping scheme at 550℃

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Green Energy & Environment 2021年第5期6卷 780-789页

作者： Yu Qiu Li Ma Qingfeng Kong Min Li Dongxu cui Shuai Zhang dewang Zeng Rui Xiao Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing210096China

Operating chemical looping process at mid-temperatures(550–750℃)presents exciting potential for the stable production of ***,the reactivity of oxygen carriers is compromised by the detrimental effect of the relatively low temperatures on the redox *** the reactivity at mid-temperature can be improved by the addition of noble metals,the high cost of these noble metal containing materials significantly hindered their scalable *** the current work,we propose to incorporate earth-abundant metals into the ironbased spinel for hydrogen production in a chemical looping scheme at ***0.2Co0.4Fe2.4O4 shows a high hydrogen production performance at the average rate of~0.62 mmol g^(-1) min^(-1) and a hydrogen yield of~9.29 mmol g^(-1) with satisfactory stability over 20 cycles at 550℃.The mechanism studies manifest that the enhanced hydrogen production performance is a result of the improved oxygen-ion conductivity to enhance reduction reaction and high reactivity of reduced samples with *** performance of the oxygen carriers in this work is comparable to those noble-metal containing materials,enabling their potential for industrial applications.

关键词： Chemical looping Mid-temperature Earth-abundant metals Spinel Hydrogen production

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Efficient CO2 to CO conversion at moderate temperatures enabled by the cobalt and copper co-doped ferrite oxygen carrier

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Journal of Energy Chemistry 2020年第7期29卷 123-132,I0005页

作者： Yu Qiu Li Ma dewang Zeng Min Li Dongxu cui Yulin Lv Shuai Zhang Rui Xiao Key Laboratory of Energy Thermal conversion and control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096JiangsuChina

Chemical looping technology holds great potential on efficient CO2 splitting with much higher CO production and CO2 splitting rate than photocatalytic *** oxygen carrier requires high temperature(typically 850–1000°C)to ensure sufficient redox activity,but the stable and high CO2 conversion is favored at a lower temperature,leading to the degrading on the reaction kinetics as well as the low CO production and CO2 splitting *** this paper,we prepared several ternary spinels and demonstrated their performance for chemical looping CO2 splitting at moderate *** the promotion effect of Cu to cobalt ferrite reduction and reversible phase change of the reduced metals,Cu0.4 Co0.6 Fe2 O4 exhibits high CO2 splitting rate(144.6μmol g–1 min–1)and total CO production(9100μmol g–1)at 650°*** high performance of this earth-abundant spinel material is also consistent in repeated redox cycles,enabling their potential in industrial use.

关键词： Chemical looping Oxygen carrier CO2 splitting Ferrite

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一种铜铁铝复合载氧体化学链燃烧性能

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石油学报（石油加工） 2020年第6期36卷 1200-1205页

作者：崔东旭曾德望肖睿东南大学能源与环境学院江苏南京210096

利用溶胶-凝胶法制备了一种Cu-Fe-Al-O复合载氧体,以CO为还原介质,在固定床反应器上探究了该载氧体的化学链燃烧性能,以及4种还原程度下该载氧体的循环反应稳定性。结果显示:在20次化学链循环反应中,Cu-Fe-Al-O复合载氧体对应的化学链... 详细信息

利用溶胶-凝胶法制备了一种Cu-Fe-Al-O复合载氧体,以CO为还原介质,在固定床反应器上探究了该载氧体的化学链燃烧性能,以及4种还原程度下该载氧体的循环反应稳定性。结果显示:在20次化学链循环反应中,Cu-Fe-Al-O复合载氧体对应的化学链反应中CO 2产率较为稳定,约为4 mmol/g;而对比样品氧化铁在第20次化学链循环时,对应的化学链反应中CO 2产率仅有0.95 mmol/g。进一步实验发现,当还原程度小于75%时,使用Cu-Fe-Al-O载氧体的化学链反应运行稳定,因为在氧化还原过程中,活性组分铜、铁与尖晶石载体存在溶出现象,限制了活性组分的聚集,因此,Cu-Fe-Al-O复合载氧体具有较高的化学链反应循环稳定性。

关键词：化学链燃烧载氧体循环稳定性还原程度

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堰塞坝溃口展宽过程实验研究

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中国水土保持科学 2017年第6期15卷 19-26页

作者：刘定竺崔鹏蒋德旺中国科学院山地灾害与地表过程重点实验室成都山地灾害与环境研究所成都610041 中国科学院大学北京100049

由于溃口各处水沙作用差异较大,不同位置的展宽过程不同,目前对溃口展宽过程的研究多着眼于某一断面,不但不能反映溃口整体的展宽过程,还会影响溃决流量计算的精度。为研究不同坝高、坝后坡比条件下溃口整体展宽过程,本研究设计了6组水... 详细信息

由于溃口各处水沙作用差异较大,不同位置的展宽过程不同,目前对溃口展宽过程的研究多着眼于某一断面,不但不能反映溃口整体的展宽过程,还会影响溃决流量计算的精度。为研究不同坝高、坝后坡比条件下溃口整体展宽过程,本研究设计了6组水槽实验,分析了45个断面的观测数据,发现:1)溃口展宽随溢流的发展表现出不同的形式,以溯源侵蚀的结束为时间节点,溯源侵蚀期间为近等宽阶段,溯源侵蚀结束后为弯曲阶段。2)在断面上,展宽模式可分为线性模式和突变模式,分别占45个断面的13.3%与86.7%;突变模式进一步可分为弱侵蚀过程Ⅰ和强侵蚀过程Ⅱ,其中强侵蚀过程只发生在弯曲阶段。3)突变模式下,过程Ⅰ侵蚀率沿程呈首尾大-中部小的"U"型分布,溃口首部和溃口尾部侵蚀率较大,中间近等宽段侵蚀率有所减小,坝后坡比越大,该过程中溃口相同位置处的侵蚀率越大;随着溢流的发展,水流结构复杂,具有明显的二次流特征,导致过程Ⅱ的侵蚀率沿程分布呈"S"型;对2个过程而言,坝高越高,相同位置处的侵蚀率越大。上述对于堰塞坝溢流展宽过程的新认识,有益于今后深入定量研究溃口展宽过程和力学机理。

关键词：堰塞坝漫顶溢流溃口展宽侵蚀率溯源侵蚀

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