作者机构：
[夏云芝; 范晓萱; 邓贤君] School of Cyber Science and Engineering, Hubei Key Laboratory of Distributed System Security, Hubei Engineering Research Center on Big Data Security, Huazhong University of Science and Technology, Wuhan, 430074, China;[王书林] School of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China;[耿艺璇] Wuhan Research Institute of Posts and Telecommunications, Wuhan, 430073, China;[唐潇] School of Mechanical Engineering, University of South China, Hunan, Hengyang, 421001, China
作者机构：
[杨彬; 郭金源] College of Electrical and Information Engineering, Hunan University, Changsha;410082, China;[何鹏] School of Mechanical Engineering, University of South China, Hengyang;421000, China;[叶小敏; 刘建强] National Satellite Ocean Application Service, Beijing
作者机构：
[Li, Xiao-Hua; Liu, Hong-Ming; Gui, Hai-Feng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Wu, Xi-Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Chu, Peng-Cheng] Qingdao Univ Technol, Res Ctr Theoret Phys, Sci Sch, Qingdao 266033, Peoples R China.;[He, Biao] Cent South Univ, Coll Phys & Elect, Changsha 410083, Peoples R China.;[Li, Xiao-Hua] Univ South China, Natl Exemplary Base Int Sci & Tech Collaborat Nuc, Hengyang 421001, Peoples R China.
通讯机构：
[Li, X.-H.] S;School Of Nuclear Science And Technology, China
关键词：
alpha-decay;deformed two-potential approach;superheavy nuclei;magic number
摘要：
<jats:title>Abstract</jats:title>
<jats:p>In this work, we systematically study the <jats:italic>α</jats:italic> decay half-lives of 196 even–even nuclei using a two-potential approach improved by considering nuclear deformation. The results show that the accuracy of this model has been improved after considering nuclear deformation. In addition, we extend this model to predict the <jats:italic>α</jats:italic> decay half-lives of <jats:italic>Z</jats:italic> = 118 and 120 isotopes by inputting the <jats:italic>α</jats:italic> decay energies extracted from the Weizsacker–Skyrme-type (WS-type) mass model, a simple nuclear mass formula, relativistic continuum Hartree–Bogoliubov theory and Duflo-Zuker-19 (DZ19) mass model. It is useful for identifying the new superheavy elements or isotopes for future experiments. Finally, the predicted <jats:italic>α</jats:italic> decay energies and half-lives of <jats:italic>Z</jats:italic> = 118 and 120 isotopes are analyzed, and the shell structure of superheavy nuclei is discussed. It shows that the shell effect is obvious at <jats:italic>N</jats:italic> = 184, while the shell effect at <jats:italic>N</jats:italic> = 178 depends on the nuclear mass model.</jats:p>
作者机构：
[Li, Xiao-Hua; Pan, Xiao; Zou, You-Tian] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua; Wu, Xi-Jun] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Peoples R China.;[Wu, Xi-Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[He, Biao] Cent South Univ, Coll Phys & Elect, Changsha 410083, Peoples R China.
通讯机构：
[Xiao-Hua Li] S;School of Nuclear Science and Technology, University of South China, Hengyang 421001, China<&wdkj&>Cooperative Innovation Center for Nuclear Fuel Cycle Technology & Equipment, University of South China, Hengyang 421001, China<&wdkj&>Key Laboratory of Low Dimensional Quantum Structures and Quantum Control, Hunan Normal University, Changsha 410081, China
关键词：
favored one proton radioactivity;one-parameter model;half-lives
摘要：
<jats:title>Abstract</jats:title>
<jats:p>In the present work, a phenomenological one-parameter model (OPM) based on the Wentzel-Kramers-Brillouin (WKB) theory is applied to study the favored one proton radioactivity (the orbital angular momentum <jats:italic>l</jats:italic> taken away by the emitted proton is equal to zero) half-lives. The calculated results can reproduce the experimental data well within a factor of ∼3. In addition, we extend the OPM to predict the half-lives of possible favored one proton radioactivity nuclei whose decay is energetically allowed or observed but not quantified in NUBASE2020. For comparison, a universal decay law of one proton radioactivity (UDLP) is also used. It is obviously found that our predicted results are close to the ones using UDLP. The predictions are helpful for searching for the new nuclides with favored one proton radioactivity.</jats:p>
作者机构：
[周祥曼; 王礴允; 袁有录; 田启华; 付君健; 杜义贤] College of Mechanical and Power Engineering, China Three Gorges University, Yichang, 443002, China;[柏兴旺] School of Mechanical Engineering, University of South China, Hengyang, 421001, China
作者机构：
[雷明] CNNC Jianzhong Nuclear Fuel Company, Yibin, 644000, China;[肖魏魏; 黄景昊] School of Mechanical Engineering, University of South China, Hengyang, 421001, China
通讯机构：
[Xiao, W.] S;School of Mechanical Engineering, China
关键词：
Cr涂层Zr-4合金;多弧离子镀;高温氧化;Cr-Zr扩散;氧化增重
摘要：
2011年的福岛核事故暴露出锆合金包壳抗高温氧化性能的不足。为此，国际核燃料领域提出了耐事故燃料这一概念。Cr涂层锆合金包壳作为耐事故燃料包壳近期可商用的技术途径得到了广泛关注。本文旨在研究Cr涂层Zr-4合金在不同温度下的高温氧化行为，采用多弧离子镀技术制备Cr涂层Zr-4合金样品，并在800?1 200 ℃空气气氛中氧化4 h，采用扫描电子显微镜（Scanning Electron Microscope，SEM）、能量色散谱仪（Energy Dispersive Spectrometer，EDS）、电子背散射衍射（Electron Backscatter Diffraction，EBSD）和掠射角X射线衍射仪（X-ray diffractometer，XRD）表征Cr涂层Zr-4合金样品在高温氧化前后的微观结构、物相等。氧化温度对Cr涂层Zr-4合金的微观组织结构、物相、Cr-Zr扩散层厚度以及氧化增重的影响分析结果显示：多弧离子镀制备的Cr涂层Zr-4合金样品表面存在大量尺寸不等的滴液，Cr涂层呈柱状晶形态生长，且沿着（110）晶面择优生长。在800?1 100 ℃高温氧化4 h后，样品表面出现不同程度的氧化，但涂层内部依然残留有未被氧化的Cr涂层，样品表面和截面没有出现微观裂纹，Cr-Zr扩散层的厚度随着氧化温度的增加呈线性规律增长，氧化增重增加缓慢。而1 200 ℃高温氧化4 h后，样品表面Cr涂层全部被氧化，表面和截面出现大量宏观裂纹，且Cr-Zr扩散层的厚度和氧化增重急剧增大。因此，采用多弧离子镀制备的Cr涂层Zr-4合金在800?1 100 ℃下表现出良好的抗高温性能，而在1 200 ℃发生了加速氧化现象。 Background
The Fukushima nuclear accident in 2011 exposed the shortcoming of high temperature oxidation resistance of zirconium alloy cladding. For this reason, the concept of accident tolerant fuel was proposed in the international nuclear fuel field. Cr-coated zirconium alloy cladding, as an accident tolerant fuel cladding near-term commercial technology approach, has received extensive attention.
Purpose
This study aims to study the high-temperature oxidation behavior of Cr-coated Zr-4 alloys at different temperatures.
Methods
Cr-coated Zr-4 alloy was prepared by multi-arc ion plating, and oxidized in air atmosphere at 800?1 200 ℃ for 4 h. Scanning Electron Microscope (SEM) and Energy Dispersive Spectrometer (EDS) were used to analyze the surface and cross-sectional micro-morphologies of Cr coated Zr-4 alloy samples before and after high-temperature oxidation and the distribution of elements on the cross section. The orientation image microscopy (OIM), inverse pole figure (IPF) and pole figure (PF) of Cr coated Zr-4 alloy samples were obtained by electron backscatter diffraction (EBSD). The phase of the samples was obtained by glancing angle X-ray diffractometer (XRD).The effect of oxidation temperature on the microstructure, phase, Cr-Zr diffusion layer thickness and oxidation weight gain of Cr-coated Zr-4 alloy were investigated.
Results
The results show that there are a large number of droplets of different sizes on the surface of the Cr-coated Zr-4 alloy samples prepared by multi-arc ion plating, and the Cr coating has a columnar crystal morphology and preferentially grows along the (110) crystal plane. After high temperature oxidation at 800~1 100 ℃ for 4 h, the surface of the sample is oxidized to different degrees, but the un-oxidized Cr coating still remains inside the coating, and no micro-cracks appear on the surface and cross-section of the sample. The thickness of the Cr-Zr diffusion layer increases linearly with the increase of the oxidation temperature, and the oxidation weight gain increases slowly. However, after high temperature oxidation at 1 200 ℃ for 4 h, the Cr coating on the surface of the sample was completely oxidized, a large number of cracks appeared on the surface and cross-section, and the thickness of the Cr-Zr diffusion layer and oxidation weight gain increased sharply.
Conclusions
Therefore, the Cr-coated Zr-4 alloy prepared by multi-arc ion plating exhibited good high temperature resistance at 800~1 100 ℃, while accelerated oxidation occurred at 1 200 ℃.
摘要：
相较于常见的双时相遥感影像,时间序列遥感影像包含更丰富的地表信息,能够缓解"异物同谱"、"同物异谱"的影响,因而在变化检测中具有重要作用。但是目前时间序列遥感影像变化检测方法大多基于像素展开,忽略了像素和周围环境的空间关系,导致变化检测结果"噪声"现象明显。基于此,提出了一种基于时空谱特征的时间序列遥感变化检测算法(change detection based on spatial- temporal- spectral features,CDSTS)。首先,利用灰度共生矩阵和局部统计计算方法,从Landsat时间序列遥感影像中提取每个像素点的时间、空间(纹理和统计)和光谱特征;其次,通过每个像素在不同波段上的时间序列表现规律,自动筛选出时序特征异常点,并与连续变化检测和分类法(continuous change detection and classification,CCDC)检测结果融合获取高精度变化/未变化训练样本点;最后,利用上述样本点及其对应的时空谱特征训练支持向量机分类器,并基于该分类器对全图进行分类。结果表明, CDSTS算法在变化区域检测精准度方面明显优于常用的时间序列变化检测算法CCDC和土地扰动连续监测方法(continuous monitoring of land disturbance,COLD),总体精度提升了4.8 ~ 11.7百分点。
通讯机构：
[Liu, Jianwen] S;Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, People's Republic of China.
关键词：
Coordination effect;Methanol selective oxidation;NiMoO4;Formate;Energy-saving hydrogen production
摘要：
<jats:title>Abstract</jats:title><jats:p>Electrocatalytic water splitting is a viable technique for generating hydrogen but is precluded from the sluggish kinetics of oxygen evolution reactions (OER). Small molecule oxidation reactions with lower working potentials, such as methanol oxidation reactions, are good alternatives to OER with faster kinetics. However, the typically employed Ni-based electrocatalysts have poor activity and stability. Herein, a novel three-dimensional (3D)-networking Mo-doped Ni(OH)<jats:sub>2</jats:sub> with ultralow Ni–Ni coordination is synthesized, which exhibits a high MOR activity of 100mAcm<jats:sup>−2</jats:sup> at 1.39V, delivering 28mV dec<jats:sup>−1</jats:sup> for the Tafel slope. Meanwhile, hydrogen evolution with value-added formate co-generation is boosted with a current density of more than 500mAcm<jats:sup>−2</jats:sup> at a cell voltage of 2.00V for 50h, showing excellent stability in an industrial alkaline concentration (6M KOH). Mechanistic studies based on density functional theory and X-ray absorption spectroscopy showed that the improved performance is mainly attributed to the ultralow Ni–Ni coordination, 3D-networking structures and Mo dopants, which improve the catalytic activity, increase the active site density and strengthen the Ni(OH)<jats:sub>2</jats:sub> 3D-networking structures, respectively. This study paves a new way for designing electrocatalysts with enhanced activity and durability for industrial energy-saving hydrogen production.</jats:p>
摘要：
<jats:title>Abstract</jats:title>
<jats:p>In the present work, we systematically study the <jats:italic>α-</jats:italic>decay half-lives of uranium (<jats:italic>Z</jats:italic>=92) isotopes based on the Gamow model with a screened electrostatic barrier. There are only two adjustable parameters in our model i.e. the parameter <jats:italic>g</jats:italic> and the screening parameter <jats:italic>t</jats:italic> in the Hulthen potential for considering the screened electrostatic effect of the Coulomb potential. The calculated results are in good agreement with experimental data, and the corresponding root-mean-square (rms) deviations of uranium isotopes with <jats:italic>α</jats:italic> transition orbital angular momentum <jats:italic>l</jats:italic>=0 and <jats:italic>l</jats:italic>=2 are 0.141 and 0.340, respectively. Moreover, we extend this model to predict <jats:italic>α-</jats:italic>decay half-lives of uranium isotopes whose <jats:italic>α</jats:italic> decay is energetically allowed or observed but not yet quantified in NUBASE2020. For comparison, the modified Hatsukawa formula (XLZ), the unified Royer formula (DZR), the universal decay law (UDL) and the Viola–Seaborg–Sobiczewski formula (VSS) are also used. The predictions are basically consistent with each other. Meanwhile, the results also indicate that <jats:italic>N</jats:italic>=126 shell closure is still robust at <jats:italic>Z</jats:italic>=92 and the spectroscopic factor <jats:inline-formula>
<jats:tex-math><?CDATA $ S_{\alpha} $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_11_114103_M1.jpg" xlink:type="simple" />
</jats:inline-formula> is almost the same for uranium isotopes with the same <jats:italic>l</jats:italic>.</jats:p>
作者机构：
[Cheng, Jun-Hao; Li, Xiao-Hua] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Zhang, Zhen] Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Peoples R China.;[Wu, Xi-Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Chu, Peng-Cheng] Qingdao Technol Univ, Sch Sci, Qingdao 266000, Peoples R China.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.
关键词：
proton radioactivity;Skyrme;Hartree-Fock;macroscopic quantities of nuclear matter
摘要：
In this study, we systematically investigate the proton radioactivity half-lives of 33 spherical nuclei based on the relationship between Skyrme parameters and the macroscopic quantities of nuclear matter. Using the two-potential approach with the spherical Skyrme-Hartree-Fock model, the correlation between proton radioactivity half-life and the macroscopic quantities is analyzed. Moreover, we obtain a new Skyrme parameter set by fitting the two most weighted macroscopic quantities. Compared with the Skyrme parameters MSL0 and the theoretical model of proton radioactivity UDLP, the theoretical proton radioactivity half-life calculated using the new Skyrme parameter set can better reproduce the experimental data.
作者机构：
[Guo, Jian] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Chen, Lei; Qian, Linmao; Gao, Jian; Xiao, Chen] Southwest Jiaotong Univ, Tribol Res Inst, State Key Lab Tract Power, Chengdu 610031, Peoples R China.;[Xiao, Chen] Adv Res Ctr Nanolithog ARCNL, Sci Pk 106, NL-1098XG Amsterdam, Netherlands.;[Chen, Lei; Qian, Linmao] Southwest Jiaotong Univ, Technol & Equipment Rail Transit Operat & Mainten, Chengdu 610031, Peoples R China.
通讯机构：
[Chen Xiao; Lei Chen] T;Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, China<&wdkj&>Advanced Research Center for Nanolithography (ARCNL), Amsterdam, The Netherlands<&wdkj&>Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, China<&wdkj&>Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu, China
作者机构：
[Zhu, De-Xing; Li, Xiao-Hua; Xu, Yang-Yang] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Liu, Hong-Ming] Fudan Univ, Inst Modern Phys, Shanghai 200433, Peoples R China.;[Wu, Xi-Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[He, Biao] Cent South Univ, Coll Phys & Elect, Changsha 410083, Peoples R China.;[Li, Xiao-Hua] Univ South China, Natl Exemplary Base Int Sci & Tech Collaborat Nuc, Hengyang 421001, Peoples R China.
通讯机构：
[Xiao-Hua Li] S;School of Nuclear Science and Technology, University of South China, Hengyang, China<&wdkj&>National Exemplary Base for International Sci & Tech. Collaboration of Nuclear Energy and Nuclear Safety, University of South China, Hengyang, China<&wdkj&>Cooperative Innovation Center for Nuclear Fuel Cycle Technology & Equipment, University of South China, Hengyang, China<&wdkj&>Key Laboratory of Low Dimensional Quantum Structures and Quantum Control, Hunan Normal University, Changsha, China
