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Study on the critical stress threshold of weakly cemented sandstone damage based on the renormalization group method

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International Journal of Coal Science & Technology 2020年第4期7卷 693-703页

作者： zhaoyang song Hongguang Ji Zhiqiang Liu Lihui Sun Beijing China Coal Mine Engineering Company Limited.Beijing 100013 China School of Civil and Resource Engineering University of Science and Technology Beijing.Beijing 100083China School of Mining and Geomatics Hebei University of Engineering.Handan 056038.China

During the microstructural analysis of weakly cemented sandstone,the granule components and ductile structural parts of the sandstone are typically *** the contact between granules in the microstructure of weakly cemented sandstone,three basic units can be determined:regular tetrahedra,regular hexahedra,and regular *** group models with granule-and pore-centered weakly cemented sandstone were established,and,according to the renormalization group transformation rule,the critical stress threshold of damage was *** results show that the renormalization model using regular octahedra as the basic units has the highest critical stress *** threshold obtained by iterative calculations of the granule-centered model is smaller than that obtained by the pore-centered *** granule-centered calculation provides the lower limit(18.12%),and the pore-centered model provides the upper limit(36.36%).Within this range,the weakly cemented sandstone is in a phase-like critical *** is,the state of granule aggregation transforms from continuous to *** the relative stress range of 18.12%-36.36%,the weakly cemented sandstone exhibits an increased proportion of high-frequency signals(by 83.3%)and a decreased proportion of low-frequency signals(by 23.6%).The renormalization calculation results for weakly cemented sandstone explain the high-low frequency conversion of acoustic emission signals during *** research reported in this paper has important significance for elucidating the damage mechanism of weakly cemented sandstone.

关键词： Weakly cemented sandstone Renormalization group method Damage and failure Threshold

Improving the estimate of wind energy input into the Ekman layer within the Antarctic Circumpolar Current

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Acta Oceanologica Sinica 2013年第3期32卷 19-27页

作者： ZHANG Yuming WU Kejian ZHANG Xiaoshuang BI Fan song zhaoyang LIU Shouhua Physical Oceanography Laboratory Ocean University of China Key Laboratory of Marine Environmental Information Technology State Oceanic AdministrationNational Marine Data and Information Service National Marine Data & Information Service

Based on the data and method offered by Liu et al. （2009）, the direct wind and Stokes drift-induced energy inputs into the Ekman layer within the Antarctic Circumpolar Current （ACC） area are reestimated since the results of the former have been proved to be underestimated. And the result shows that the total rate of energy input into the Ekman-Stokes layer within the ACC area is 852.41 GW, including 649.75 GW of direct wind energy input （76%） and 202.66 GW of Stoke drift-induced energy input （24%）. Total increased energy input, due to wave-induced Coriolis-Stokes forcing added to the classical Ekman model, is 52.05 GW, accounting for 6.5% of the wind energy input into the classical Ekman layer. The long-term variability of direct wind and Stokes drift-induced energy inputs into the Ekman layer within the ACC is also investigated, and the result shows that the Stokes drift hinders the decadal increasing trend of direct wind energy input. Meanwhile, there is a period of 4-5 a in the energy spectrums, as same as the Antarctic circumpolar wave.

关键词： energy input Ekman-Stokes layer Coriolis-Stokes forcing Antarctic Circumpolar Current

Heterostructured Co_(3)Se_(4)/CoSe_(2)@C nanoparticles attached on three-dimensional reduced graphene oxide as a promising anode towards Li-ion batteries

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Frontiers of Materials Science 2024年第2期18卷 101-115页

作者： Mingjun Pang zhaoyang song Miaomiao Mao Shang Jiang Ruxia Zhang Runwei Wang Jianguo Zhao Engineering Research Center of Coal-based Ecological Carbon Sequestration Technology of the Ministry of Education Shanxi Datong UniversityDatong 037009China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China

In situ carbon-coated Co_(3)Se_(4)/CoSe_(2)(Co_(x)Se_(y))nanoparticles(NPs)attached on three-dimensional(3D)reduced graphene oxide(rGO)sheets were skillfully developed in this work,which involved the environment-friendly hydrothermal method,freeze drying,and selenide *** the structure,the glucose-derived carbon layer exhibited significantly homogeneous dispersion under an argon *** structure not only has enhanced stability,but also can effectively mitigate the volume swell of Co_(x)Se_(y) *** resulted Co_(3)Sea/CoSe_(2)@C/rGO(CSe@C/rGO)exhibited a specific surface area(SSA)of 240.9 m^(2)·g^(-1),offering more electrochemically active sites for the storage of energy related to lithium *** rGO matrix held exceptional flexibility and functional structural rigidity,facilitating the swift ion intercalation and ensuring the high conductivity and recyclability of the *** applied to anodes designed for lithium-ion batteries(LiBs),this material demonstrated distinguished rate and ultra-high reversible capacity(872.98 mA·h·g^(-1) at 0.5 A·g^(-1)).Meanwhile,its capacity retention reached 119.5%after 500 cycles at 2 A·g^(-1),with a coulombic efficiency of 100%.This work potentially paves the way for generating fast and powerful metal selenide anodes and initiating LiBs with good performance.

关键词： CSe@C/rGO lithium-ion battery reduced graphene oxide electrochemicalperformance heterostructure

The Assessment of Global Surface Temperature Change from 1850s:The C-LSAT2.0 Ensemble and the CMST-Interim Datasets

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Advances in Atmospheric Sciences 2021年第5期38卷 875-888页

作者： Wenbin SUN Qingxiang LI Boyin HUANG Jiayi CHENG zhaoyang song Haiyan LI Wenjie DONG Panmao ZHAI Phil JONES School of Atmospheric Sciences and Key Laboratory of Tropical Atmosphere−Ocean System Ministry of EducationZhuhai 519082China National Centers for Environmental Information NOAAAshevilleNC 28801USA Chinese Academy of Meteorological Sciences CMABeijing 100081China Climatic Research Unit University of East AngliaNorwich NR47TJUK Southern Laboratory of Ocean Science and Engineering(Guangdong Zhuhai) Zhuhai 519082China

Based on C-LSAT2.0,using high-and low-frequency components reconstruction methods,combined with observation constraint masking,a reconstructed C-LSAT2.0 with 756 ensemble members from the 1850s to 2018 has been *** ensemble versions have been merged with the ERSSTv5 ensemble dataset,and an upgraded version of the CMSTInterim dataset with 5°×5°resolution has been *** CMST-Interim dataset has significantly improved the coverage rate of global surface temperature *** reconstruction,the data coverage before 1950 increased from 78%−81%of the original CMST to 81%−89%.The total coverage after 1955 reached about 93%,including more than 98%in the Northern Hemisphere and 81%−89%in the Southern *** the reconstruction ensemble experiments with different parameters,a good basis is provided for more systematic uncertainty assessment of C-LSAT2.0 and *** comparison with the original CMST,the global mean surface temperatures are estimated to be cooler in the second half of 19th century and warmer during the 21st century,which shows that the global warming trend is further *** global warming trends are updated from 0.085±0.004℃(10 yr)^(–1)and 0.128±0.006℃(10 yr)^(–1)to 0.089±0.004℃(10 yr)^(–1)and 0.137±0.007℃(10 yr)^(–1),respectively,since the start and the second half of 20th century.

关键词： C-LSAT2.0 ensemble datasets CMST-Interim EOTs high-and low-frequency components reconstruction

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基于事故率的城市供水管网全寿命运行可靠性

同济大学学报（自然科学版） 2019年第9期47卷 1286-1293页

作者：刘威宋朝阳同济大学土木工程学院上海200092 同济大学土木工程防灾国家重点实验室上海200092

利用不同管材的事故率模型、不同事故的模拟模型和基于Langelier的管道粗糙度时变模型建立了城市供水管网全寿命运行可靠性分析方法.通过敏感性分析,建议了模型中关键参数的取值.对某市供水管网进行了50年的运行可靠性模拟,根据分析结... 详细信息

利用不同管材的事故率模型、不同事故的模拟模型和基于Langelier的管道粗糙度时变模型建立了城市供水管网全寿命运行可靠性分析方法.通过敏感性分析,建议了模型中关键参数的取值.对某市供水管网进行了50年的运行可靠性模拟,根据分析结果指出了薄弱区域,并给出了管网改造措施.

关键词：供水管网运行可靠性全寿命事故率管道粗糙度

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多级跳线连接的深度残差网络超分辨率重建

电子与信息学报 2019年第10期41卷 2501-2508页

作者：赵小强宋昭漾兰州理工大学电气工程与信息工程学院兰州730050 甘肃省工业过程先进控制重点实验室兰州730050 兰州理工大学国家级电气与控制工程实验教学中心兰州730050

由于快速的卷积神经网络超分辨率重建算法(FSRCNN)卷积层数少、相邻卷积层的特征信息之间缺乏关联性,因此难以提取到图像深层信息导致图像超分辨率重建效果不佳。针对此问题,该文提出多级跳线连接的深度残差网络超分辨率重建方法。首先... 详细信息

由于快速的卷积神经网络超分辨率重建算法(FSRCNN)卷积层数少、相邻卷积层的特征信息之间缺乏关联性,因此难以提取到图像深层信息导致图像超分辨率重建效果不佳。针对此问题,该文提出多级跳线连接的深度残差网络超分辨率重建方法。首先,该方法设计了多级跳线连接的残差块,在多级跳线连接的残差块基础上构造了多级跳线连接的深度残差网络,解决相邻卷积层的特性信息缺乏关联性的问题;然后,使用随机梯度下降法(SGD)以可调节的学习率策略对多级跳线连接的深度残差网络进行训练,得到该网络超分辨率重建模型;最后,将低分辨率图像输入到多级跳线连接的深度残差网络超分辨率重建模型中,通过多级跳线连接的残差块得到预测的残差特征值,再将残差图像和低分辨率图像组合在一起转化为高分辨率图像。该文方法与bicubic,A+,SRCNN,FSRCNN和ESPCN算法在Set5和Set14测试集上进行了对比测试,在视觉效果和评价指标数值上该方法都优于其它对比算法。

关键词：超分辨率重建深度残差网络多级跳线连接的残差块随机梯度下降法

Fast and Stable Zinc Anode‑Based Electrochromic Displays Enabled by Bimetallically Doped Vanadate and Aqueous Zn^(2+)/Na^(+)Hybrid Electrolytes

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Nano-Micro Letters 2023年第12期15卷 231-241页

作者： zhaoyang song Bin Wang Wu Zhang Qianqian Zhu Abdulhakem YElezzabi Linhua Liu William WYu Haizeng Li College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071People’s Republic of China Optics and Thermal Radiation Research Center Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237People’s Republic of China School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100People’s Republic of China Ultrafast Optics and Nanophotonics Laboratory Department of Electrical and Computer EngineeringUniversity of AlbertaEdmontonAB T6G 2V4Canada

Vanadates are a class of the most promising electrochromic materials for displays as their multicolor ***,the slow switching times and vanadate dissolution issues of recently reported vanadates significantly hinder their diverse practical ***,novel strategies are developed to design electrochemically stable vanadates having rapid switching *** show that the interlayer spacing is greatly broadened by introducing sodium and lanthanum ions into V_(3)O_(8)interlayers,which facilitates the transportation of cations and enhances the electrochemical *** addition,a hybrid Zn^(2+)/Na^(+)electrolyte is designed to inhibit vanadate dissolution while significantly accelerating electrochemical *** a result,our electrochromic displays yield the most rapid switching times in comparison with any reported Zn-vanadate electrochromic *** is envisioned that stable vanadate-based electrochromic displays having video speed switching are appearing on the near horizon.

关键词： Vanadates Hybrid electrolytes Displays Electrochromic

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全日制与非全日制研究生统筹管理改革刍议

国家教育行政学院学报 2018年第6期 22-27页

作者：宋朝阳武汉大学湖北武汉430072

围绕全日制和非全日制研究生统筹管理改革实践中出现的教育理念和培养方式脱节、日常管理和德育工作缺位、就业管理和创业服务滞后等问题,认为落实好国家改革举措,顺利推进研究生教育发展,需要将两种培养类型统筹考虑。在落实推进统筹... 详细信息

围绕全日制和非全日制研究生统筹管理改革实践中出现的教育理念和培养方式脱节、日常管理和德育工作缺位、就业管理和创业服务滞后等问题,认为落实好国家改革举措,顺利推进研究生教育发展,需要将两种培养类型统筹考虑。在落实推进统筹管理的改革实践中,应以创新发展理念为基础,以提升协同能力为保障,切实提高研究生培养质量。

关键词：非全日制研究生教育统筹管理

高校招生工作中专家组面试质量的影响因素分析

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湖南师范大学教育科学学报 2018年第5期17卷 83-91页

作者：宋朝阳武汉大学研究生院湖北武汉430072

提高高校人才选拔质量的关键是测试考核质量。在深化考试招生制度改革过程中要充分发挥专家组作用,通过专家组面试强化对学生素质和能力的全面考察。实践中,作为测试组织方式的专家组面试可能产生不同的质量效果。此研究以博弈论和经济... 详细信息

提高高校人才选拔质量的关键是测试考核质量。在深化考试招生制度改革过程中要充分发挥专家组作用,通过专家组面试强化对学生素质和能力的全面考察。实践中,作为测试组织方式的专家组面试可能产生不同的质量效果。此研究以博弈论和经济分析方法,对高校招生工作中专家组面试质量的影响因素进行研究讨论,最后得出结论:专家组面试活动兼有私人属性和公共属性,不应将其纳入私人范畴,而应以集体物品生产的角度,促进合作,提高效用,保障考核质量。

关键词：专家组面试高校考试招生集体物品俱乐部物品博弈论