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Influence of Cold-Rolling Reduction on Microstructure and Tensile Properties of Nuclear FeCrAl Alloy with Low Cr and Nb Contents

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Acta Metallurgica Sinica(English Letters) 2022年第12期35卷 2101-2110页

作者： Hui Wang biao Guo Xuguang An Yu Zhang Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610213China School of Materials Science and Engineering Xihua UniversityChengdu 610039China Interdisciplinary Materials Research Center Institute for Advanced StudyChengdu UniversityChengdu 610106China

FeCrAl alloy is one of the most promising candidates as an accident-tolerant fuel(ATF)cladding ***,the influence of cold-rolling(CR)reduction on microstructure and tensile properties of the as-annealed FeCrAl alloys,with low Cr and Nb contents,is systematically *** the increase in CR reduction,the grain size of FeCrAl alloy is obviously refined after annealing because the increase in stored deformation energy leads to enhanced ***,the large CR reductions result in a severe mixed-grain microstructure,significantly reducing the uniform deformability of the FeCrAl *** dislocation density of the as-annealed FeCrAl alloy decreases with the increase in CR reduction,except for the excessive CR reduction of 50%.Moreover,the Laves phases are crushed and dissolved during CR and annealing,as well as large amounts of refined Laves phases are found after large CR *** pinning effect of the Laves phases can significantly improve the strength of FeCrAl ***,the strengthening mechanisms of FeCrAl alloy consist of fine-grain strengthening,dislocation strengthening and precipitation ***,the FeCrAl alloy,with a CR reduction of 30%,achieves optimal tensile *** study can provide theoretical guidance for the industrial production of the FeCrAl alloy.

关键词： FeCrAl alloy Cold-rolling reduction Tensile properties Microstructure evolution Strengthening mechanism

Synthesis of the ABC skeleton of the aglycon of Echinoside A

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Chinese Chemical Letters 2015年第11期26卷 1331-1335页

作者： Jun Yu biao Yua Department of Chemistry University of Science and Technology of China State Key Laboratory of Bio-organic and Natural Products Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences

Echinoside A is a triterpene saponin isolated from the sea cucumberActinopyga echinites （JAEGER）, which displays potent antitumor activities in vitro and in vivo. Here, we report the synthesis of the ABC-fused ring skeleton of the aglycon of Echinoside A, with the enantiomerically pure （＋）-Wieland-Miescher ketone being used as starting material and a Robinson annulation as the key reaction.

关键词： Echinoside AWieland-Miescher ketoneRobinson annulationSaponin

Denaturing high-performance liquid chromatography to diagnose cerebral autosomal dominant arteriopathy in Chinese patients with subcortical infarcts and leukoencephalopathy

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Neural Regeneration Research 2008年第6期3卷 674-678页

作者： Xiaomei Tang biao Chen Research Institute of Gerontology Xuanwu Hospital of Capital Medical University Beijing 100053 China Department of Neurology Haidian Hospital Beijing 100080 China

BACKGROUND： Notch3 mutations are the molecular genetic foundation for cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy （CADASIL）. Of all currently available detection methods, direct sequencing or restriction enzymes are frequently used, but the cost is relatively high, because the Notch3 gene is composed of many exons and mutational sites are widely distributed. Denaturing high-performance liquid chromatography （DHPLC） exhibits high efficiency and specificity and has been applied to gene detection. To date, there has no report regarding DHPLC in gene detection of large-scale CADASIL families in China. OBJECTIVE： To explore the application and value of DHPLC in the diagnosis of CADASIL by a mutation screening for Notch3 gene in CADASIL probands and their family members. DESIGN, TIME AND SETTING： A comparative observation was performed at the Genetic Diagnosis Laboratory of Institute of Geriatrics, Xuanwu Hospital of Capital Medical University and the Key Laboratory for Neurodegenerative Disease of the Ministry of Education between August 2003 and May 2004. PARTICIPANTS： Fourteen CADASIL patients and their family members, comprising eight males and six females, aged 38-62 years, were included. Their key features included recurrent sub-cortical ischemic events and vascular dementia. In addition, 100 healthy physical examinees were selected as controls, including 52 males and 48 females, aged 56-72 years, who had no neurodegenerative disease or psychosis, and no history or high risk for cerebrovascular disease. METHODS： DNA was extracted from white blood cells. Ten hotspots of the Notch3 gene for sequence variation were first amplified by PCR, and the products were detected using DHPLC, Exons exhibiting a variant in the DHPLC profile underwent another PCR amplification, followed by DNA sequencing to identify the mutation type, In addition, patients with normal DHPLC peak profiles underwent PCR amplification for the remaining 13

关键词： CADASIL DHPLC Notch3 mutation

On the Boundedness of Rough Oscillatory Singular Integrals on Triebel-Lizorkin Spaces

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Acta Mathematica Sinica,English Series 2011年第10期27卷 1881-1898页

作者： Leslie CHENG Yi biao PAN Department of Mathematics Bryn Mawr College Bryn Mawr PA 19010 USA Department of Mathematics University of Pittsburgh Pittsburgh~ PA 15260 USA

We obtain appropriate sharp bounds on Triebel-Lizorkin spaces for rough oscillatory inte- grals with polynomial phase. By using these bounds and using an extrapolation argument we obtain some new and previously known ... 详细信息

关键词： Oscillatory singular integral rough kernel Orlicz spaces Block spaces extrapolation Triebel-Lizorkin spaces

Majorana modes in solid state systems and its dynamics

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Frontiers of physics 2018年第2期13卷 103-109页

作者： Qi Zhang biao Wu College of Science Zhejiang University of Technology Hangzhou 310014 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Wilczek Quantum Center School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China

We review the properties of Majorana fermions in particle physics and point out that Majorana modes in solid state systems are significantly different. The key reason is the concept of anti-particle in solid state systems is different from its counterpart in particle physics. We define Majorana modes as the eigenstates of Majorana operators and find that they can exist both at edges and in the bulk. According to our definition, only one single Majorana mode can exist in a system no matter at edges or in the bulk. Kitaev＇s spinless p-wave superconductor is used to illustrate our results and the dynamical behavior of the Majorana modes.

关键词： Majorana mode Majorana operator anti-particle Kitaev's model dynamical behavior

A dynamic MOF for efficient purification of propylene

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Science China Chemistry 2021年第12期64卷 2053-2054页

作者： Rui-biao Lin Banglin Chen MOE Key Laboratory of Bioinorganic and Synthetic Chemistry School of ChemistrySun Yat-Sen UniversityGuangzhou510006China Department of Chemistry University of Texas at San AntonioSan AntonioTX78249USA

Propylene is an important chemical feedstock for making chemical products such as polypropylene and acrylonitrile,whereas propane is well-known for heating and *** and propane are usually found as a mixture since they come from steam cracking of heavy hydrocarbons like *** two differ by just two hydrogen atoms and have the same alkyl part,i.e.

关键词： propylene hydrocarbons dynamic

Ocean wave parameters retrieved directly from compact polarimetric SAR data

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Acta Oceanologica Sinica 2022年第4期41卷 129-137页

作者： Yu Liu Yijun He biao Zhang School of Electronic and Information Engineering Nanjing University of Information Science&TechnologyNanjing 210044China School of Marine Science Nanjing University of Information Science&TechnologyNanjing 210044China

We aim to directly invert wave parameters by using the data of a compact polarimetric synthetic aperture radar(CP SAR)and validate the effectiveness of ocean wave parameter retrieval from the circular transmit/linear receive mode andπ/4 compact polarimetric *** data from the RADARSAT-2 fully polarimetric SAR on the C-band were used to obtain the compact polarimetric SAR images,and a polarimetric SAR wave retrieval algorithm was used to verify the sea surface wave *** the data and algorithm,there is no need to estimate complex hydrodynamic modulation transfer functions,even at large radar incidence ***,the radar backscattering cross-sections and backscattering cross-section of the radar linearly polarized with any polarization orientation angle were calculated in the two compact polarimetric SAR ***,the wave slopes along the azimuth direction and the range direction were calculated directly using CP SAR ***,we obtained the slope spectrum of the wave from the estimated wave slopes along azimuth and range *** wave parameters extracted from the synthetic wave slope spectrum were compared with those obtained from buoy observations of the National Data Buoy Center,verifying a suitable agreement.

关键词： RADARSAT-2 CP SAR wave parameters wave slope spectrum

Fe_(n)Mo_(38-n)(n=0-38)及Fe_(n)Mo_(55-n)(n=0-55)双金属团簇的结构演化和基态能量

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原子与分子物理学报 2025年第3期42卷 85-93页

作者：郑琪琪陈轩程彪段海明新疆大学物理科学与技术学院乌鲁木齐830017

基于半经验的Gupta多体势,采用遗传算法及分子动力学淬火算法,系统研究了(FeMo)m(m=38及55)双金属团簇的基态结构及其能量.结果表明:对于Fe_(n)Mo_(38-n)(n=0-38)团簇,随Fe原子数的增加,Fe原子优先占据团簇表面再占据内部,其基态构型存... 详细信息

基于半经验的Gupta多体势,采用遗传算法及分子动力学淬火算法,系统研究了(FeMo)m(m=38及55)双金属团簇的基态结构及其能量.结果表明:对于Fe_(n)Mo_(38-n)(n=0-38)团簇,随Fe原子数的增加,Fe原子优先占据团簇表面再占据内部,其基态构型存在类O_(h)结构、类I_(h)结构和无序结构间的竞争.对于Fe_(n)Mo_(55-n)(n=0-55)团簇,随Fe原子数的增加,Fe原子优先占据团簇中心位置,再依次占据表面顶点、棱边和次外层,双金属团簇基态构型主要体现为在Mackay二十面体基础上的结构畸变.Fe_(24)Mo_(14),Fe_(13)Mo_(42)和Fe_(43)Mo_(12)为幻数结构团簇,研究发现双金属团簇幻数成因不能通过单质团簇常用的平均配位数和平均键长模型解释,它更多的归咎于组分效应导致的结构高对称性.

关键词：双金属团簇结构和能量淬火算法遗传算法

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Fe_(n)Co_(55-n)与Co_(n)Mo_(55-n)(n=0~55)团簇基态的能量与结构演化

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原子与分子物理学报 2025年第5期42卷 57-66页

作者：程彪郑琪琪陈轩段海明新疆大学物理科学与技术学院乌鲁木齐830049

采用半经验的Gupta多体势函数结合遗传算法及分子动力学淬火算法,系统研究了Co_(n)Mo_(55-n)(n=0~55)与Fe_(n)Co_(55-n)(n=0~55)团簇的基态结构与能量.通过分析基态结构的相似函数、质心间距、平均键长、平均原子配位数、平均结合能、... 详细信息

采用半经验的Gupta多体势函数结合遗传算法及分子动力学淬火算法,系统研究了Co_(n)Mo_(55-n)(n=0~55)与Fe_(n)Co_(55-n)(n=0~55)团簇的基态结构与能量.通过分析基态结构的相似函数、质心间距、平均键长、平均原子配位数、平均结合能、混合能与二阶差分能.探究了团簇基态的结构特征及稳定性与团簇所含元素种类及组分的关联.结果表明:对Co-Mo混合团簇,随Co原子数目增加,Co原子依次占据团簇中心与最外层顶点,混合团簇逐渐出现组分偏析与无序现象;对Fe-Co混合团簇,基态结构主体上均体现为围绕Mackay二十面体构型的结构畸变,随Fe原子含量增加,Fe原子先占据团簇外表面顶点位置直到全部包裹Co原子,逐渐形成核壳式结构;Co_(13)Mo_(42)与Fe_(42)Co_(13)是幻数结构团簇,研究发现组分效应导致的团簇高对称性相比团簇平均键长与平均原子配位数更能解释幻数结构的成因.

关键词：遗传算法淬火算法双金属团簇基态结构