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Temperature-Dependent Tearing Behavior of Rubber Materials:Characterization and Modeling

Acta Mechanica Solida Sinica 2024年第2期37卷 316-326页

作者： Qinyuan Yao Feilong Zhang pan dong Ziyuan Zhao Yi He Weiguo Li Liming Chen State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing400044China College of Aerospace Engineering Chongqing UniversityChongqing400044China

With the increasingly widespread application of rubber in many fields,there is a growing demand for quantitative characterization of temperature-dependent mechanical properties in high-temperature service *** critical tearing energy is an important criterion for determining whether rubber materials will experience tearing instability,while tear strength is a key parameter for rubber materials to resist *** is necessary to quantitatively characterize their evolution with *** theoretical research mainly relies on fitting a large amount of experimental data,which is not convenient for engineering ***,in this work,a temperature-dependent critical tearing energy model is firstly developed based on the force-heat equivalence energy density *** model considers the equivalent relationship between the critical tearing energy required for crack instability propagation and the thermal energy stored in the rubber *** is demonstrated that our model has higher prediction accuracy when compared to other ***,combining with the Griffith fracture theory,temperature-dependent tear strength models applicable to three different crack modes are separately *** models are validated using experimental data for Mode I opening cracks and ModeⅢtearing cracks,and good consistency is ***,a quantitative analysis of the influence of elastic modulus on tear strength at different temperatures is *** work provides a reliable way for predicting temperature-dependent tearing instability behavior and offers beneficial suggestions for improving the tear strength of rubber materials at different temperatures.

关键词： Temperature-dependent Critical tearing energy Tear strength Rubber Theoretical model

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Multi-physical fields distribution in billet during helical electromagnetic stirring:A numerical simulation research

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China Foundry 2024年第1期21卷 51-59页

作者： dong pan Qing-tao Guo Kai-lun Zhang Fu-zhi Yu Yu-ying Li Yu-bao Xiao State Key Laboratory of Metal Materials for Marine Equipment and Application Anshan 114009LiaoningChina Ansteel Beijing Research Institute Co. Ltd.Beijing 102200China

Electromagnetic stirring is one of the widely applied techniques to modify the quality of casting *** from conventional rotate stirring,the helical stirring is more professional in assisting multi-dimensional flow of molten metal and eliminating solidification *** this study,the single-winding helical stirring(SWHS)was introduced,offering advantages such as smaller volume and lower electromagnetic shielding compared to traditional helical stirring *** a comprehensive numerical simulation,the stirring parameters of SWHS were adjusted to yoke inclination angle of 43°and frequency of 12 *** higher electromagnetic force and flow velocity in drawing direction,as well as the lower temperature gradient induced by the SWHS,are positive factors for homogeneous solidification of *** experimental results on Al-8%Si alloy and 0.4%C-1.1%Mn steel demonstrate that compared to rotate stirring,the SWHS process can induce better billet quality and is more effective in accelerating the equiaxed expansion and reducing element *** SWHS process can enhance the equiaxed ratio of the billet by 58.3%and reduce segregation degree of carbon element by 10.97%.Consequently,SWHS holds great promise as a potential approach for improving the quality of continuous casting billets.

关键词： billet electromagnetic stirring helical solidification element segregation numerical simulation

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Rolling Decision Model of Thermal Power Retrofit and Generation Expansion Planning Considering Carbon Emissions and Power Balance Risk

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Energy Engineering 2024年第5期121卷 1309-1328页

作者： dong pan Xu Gui Jiayin Xu Yuming Shen Haoran Xu Yinghao Ma Economic and Technology Research Institute State Grid Anhui Electric Power Co.Ltd.Hefei230022China School of Electrical and Automation Engineering Hefei University of TechnologyHefei230009China

With the increasing urgency of the carbon emission reduction task,the generation expansion planning process needs to add carbon emission risk constraints,in addition to considering the level of power ***,methods for quantifying and assessing carbon emissions and operational risks are *** results in excessive carbon emissions and frequent load-shedding on some days,although meeting annual carbon emission reduction ***,in response to the above problems,carbon emission and power balance risk assessment indicators and assessment methods,were proposed to quantify electricity abundance and carbon emission risk level of power planning scenarios,considering power supply regulation and renewable energy fluctuation ***,building on traditional two-tier models for low-carbon power planning,including investment decisions and operational simulations,considering carbon emissions and power balance risks in lower-tier operational simulations,a two-tier rolling model for thermal power retrofit and generation expansion planning was *** model includes an investment tier and operation assessment tier and makes year-by-year decisions on the number of thermal power units to be retrofitted and the type and capacity of units to be ***,the rationality and validity of the model were verified through an example analysis,a small-scale power supply system in a certain region is taken as an *** model can significantly reduce the number of days of carbon emissions risk and ensure that the power balance risk is within the safe limit.

关键词： Carbon emission risk power balance risk thermal power retrofit generation expansion planning

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Embedded high-quality ternary GaAs_(1−x)Sb_(x) quantum dots in GaAs nanowires by molecular-beam epitaxy

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Journal of Semiconductors 2024年第8期45卷 18-24页

作者： Xiyu Hou Lianjun Wen Fengyue He Ran Zhuo Lei Liu Hailong Wang Qing Zhong dong pan Jianhua Zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China

Semiconductor quantum dots are promising candidates for preparing high-performance single photon sources.A basic requirement for this application is realizing the controlled growth of high-quality semiconductor quantum ***,we report the growth of embedded GaAs_(1−x)Sb_(x) quantum dots in GaAs nanowires by molecular-beam *** is found that the size of the GaAs_(1−x)Sb_(x) quantum dot can be well-defined by the GaAs *** dispersive spectroscopy analyses show that the antimony content x can be up to 0.36 by tuning the growth *** GaAs_(1−x)Sb_(x) quantum dots exhibit a pure zinc-blende *** addition,we have developed a new technology to grow GaAs passivation layers on the sidewalls of the GaAs_(1−x)Sb_(x) quantum *** from the traditional growth process of the passivation layer,GaAs passivation layers can be grown simultaneously with the growth of the embedded GaAs_(1−x)Sb_(x) quantum *** spontaneous GaAs passivation layer shows a pure zinc-blende phase due to the strict epitaxial relationship between the quantum dot and the passivation *** successful fabrication of embedded high-quality GaAs_(1−x)Sb_(x) quantum dots lays the foundation for the realization of GaAs_(1−x)Sb_(x)-based single photon sources.

关键词： semiconductor quantum dot nanowire GaAs_(1−x)Sb_(x) molecular-beam epitaxy

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Enhanced magnetic anisotropy and high hole mobility in magnetic semiconductor Ga_(1-x-y)Fe_(x)Ni_(y)Sb

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Journal of Semiconductors 2024年第1期45卷 16-21页

作者： Zhi Deng Hailong Wang Qiqi Wei Lei Liu Hongli Sun dong pan Dahai Wei Jianhua Zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100190Chin

(Ga,Fe)Sb is a promising magnetic semiconductor(MS)for spintronic applications because its Curie temperature(T_(C))is above 300 K when the Fe concentration is higher than 20%.However,the anisotropy constant Ku of(Ga,Fe)Sb is below 7.6×10^(3)erg/cm^(3)when Fe concentration is lower than 30%,which is one order of magnitude lower than that of(Ga,Mn)*** address this issue,we grew Ga_(1-x-y)Fe_(x)Ni_(y)Sb films with almost the same x(≈24%)and different y to characterize their magnetic and electrical transport *** found that the magnetic anisotropy of Ga_(0.76-y)Fe_(0.24)Ni_(y)Sb can be enhanced by increasing y,in which Ku is negligible at y=1.7%but increases to 3.8×10^(5)erg/cm^(3)at y=6.1%(T_(C)=354 K).In addition,the hole mobility(μ)of Ga_(1-x-y)Fe_(x)Ni_(y)Sb reaches 31.3 cm^(2)/(V∙s)at x=23.7%,y=1.7%(T_(C)=319 K),which is much higher than the mobility of Ga_(1-x)Fe_(x)Sb at x=25.2%(μ=6.2 cm^(2)/(V∙s)).Our results provide useful information for enhancing the magnetic anisotropy and hole mobility of(Ga,Fe)Sb by using Ni co-doping.

关键词： magnetic semiconductor molecular beam epitaxy Fe-Ni co-doping magnetic anisotropy hole mobility

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基于工况知识引导注意力时间卷积网络的烧结终点预测

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控制理论与应用 2024年第3期41卷 447-453页

作者：方怡静蒋朝辉桂卫华潘冬中南大学自动化学院湖南长沙410083 南洋理工大学化学化工与生物工程学院新加坡637459

烧结终点位置的实时准确预测对于优化烧结工艺具有重要的意义.针对烧结过程中强非线性和动态时变性造成烧结终点高精度预测难的问题,本文提出了一种基于工况知识引导注意力时间卷积网络(AM–TCN)模型.首先,构建堆叠的时间卷积模块用于... 详细信息

烧结终点位置的实时准确预测对于优化烧结工艺具有重要的意义.针对烧结过程中强非线性和动态时变性造成烧结终点高精度预测难的问题,本文提出了一种基于工况知识引导注意力时间卷积网络(AM–TCN)模型.首先,构建堆叠的时间卷积模块用于充分提取烧结过程数据中深层次的非线性特征;其次,将历史工况知识引入注意力机制,引导模型在保留过程数据时序特征的同时区分不同特征的重要性;最后,构建预测模型用于烧结终点位置在线预测.工业数据实验表明,所提AM–TCN模型具有较好的烧结终点预测精度,对提升烧结过程热状态稳定性具有重要意义.

关键词：注意力机制时间卷积网络工况知识烧结终点预测

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Isolation and characterization of spike S2-specific monoclonal antibodies with reactivity to pan-coronaviruses

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Virologica Sinica 2024年第1期39卷 169-172页

作者： Yabin Hu Jun Chen Jing Yang Zhanpeng Liu Xiaoyue Zhang Qian Wu Lulu Liu Shishan Teng Rongzhang He Bo Liu Xingyu Zheng Rui Lu dong pan You Wang Liting Peng Hongying chen Yi-Ping Li Wenpei Liu Xiaowang Qu College of Basic Medical Sciences Hengyang Medical SchoolUniversity of South China&MOE Key Lab of Rare Pediatric DiseasesHengyang421001China Translational Medicine Institute The First People's Hospital of ChenzhouHengyang Medical SchoolUniversity of South ChinaChenzhou423000China College of Life Sciences Northwest A&F UniversityYangling712100China Institute of Human Virology Department of Pathogen Biology and Biosecurityand Key Laboratory of Tropical Disease Control of Ministry of EducationZhongshan School of MedicineSun Yat-sen UniversityGuangzhou510080China School of Public Health University of South ChinaHengyang421001China

Dear Editor,Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),theseventh coronavirus known to jump from intermediate hosts to humans,has resulted in a worldwide pandemic and caused immense economicdamage(Tan et al.,2020;Zhu et al.,2020).It is believed that coronavirus spillover may occur again in the *** exposure to a bat coro-navirus has been serologically confimed in a rural area of China,indi-cating that the coronavirus spillover occurred,although the origin andfrequency of spillovers are unclear(Wang et al.,2018).

关键词： monoclonal acute

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抗生素替代品后生元在动物生产中的研究进展

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饲料研究 2024年第3期47卷 127-131页

作者：潘东斌杨艳北京都润科技有限公司北京100081 北京市园林学校北京102400

在动物生产中,开发并合理利用安全、天然和高性价比的抗生素替代品是一个重要研究课题。后生元是指对宿主健康有益的无生命活性的微生物或代谢产物。与益生菌相比,后生元的稳定性和安全性更好。后生元在调控肠道菌群和调节免疫系统以及... 详细信息

在动物生产中,开发并合理利用安全、天然和高性价比的抗生素替代品是一个重要研究课题。后生元是指对宿主健康有益的无生命活性的微生物或代谢产物。与益生菌相比,后生元的稳定性和安全性更好。后生元在调控肠道菌群和调节免疫系统以及抑制病原体等方面具有重要作用,这有利于肉蛋等畜产品的安全绿色生产,减少由疫病带来的经济损失,从而促进畜牧业的可持续发展。文章综述了后生元的特性、分类组成、生物学功能及潜在作用机制,为其在动物生产中的应用提供参考。

关键词：后生元菌群免疫

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基于知识与AW-ESN融合的烧结过程FeO含量预测

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自动化学报 2024年第2期50卷 282-294页

作者：方怡静蒋朝辉黄良桂卫华潘冬中南大学自动化学院长沙410000 鹏城实验室深圳518000

氧化亚铁(FeO)含量是衡量烧结矿强度和还原性的重要指标,烧结过程FeO含量的实时准确预测对于提升烧结质量、优化烧结工艺具有重要意义.然而烧结过程热状态参数缺失、过程参数波动频繁给FeO含量的高精度预测带来巨大的挑战,为此,提出一... 详细信息

氧化亚铁(FeO)含量是衡量烧结矿强度和还原性的重要指标,烧结过程FeO含量的实时准确预测对于提升烧结质量、优化烧结工艺具有重要意义.然而烧结过程热状态参数缺失、过程参数波动频繁给FeO含量的高精度预测带来巨大的挑战,为此,提出一种基于知识与变权重回声状态网络融合(Fusion of data-knowledge and adaptive weight echo state network, DK-AWESN)的烧结过程FeO含量预测方法.首先,针对烧结过程热状态参数缺失的问题,建立烧结料层最高温度分布模型,实现基于料层温度分布特征的FeO含量等级划分;其次,针对烧结过程参数波动频繁的问题,提出基于核函数高维映射的多尺度数据配准方法,有效抑制离群点的影响,提升建模数据的质量;最后,针对烧结过程数据驱动模型缺乏机理认知致使模型预测精度不高的问题,将过程数据中提取得到的FeO含量等级知识与AW-ESN (Adaptive weight echo state network)结合,建立DK-AWESN模型,有效提升复杂工况下FeO含量的预测精度.现场工业数据试验表明,所提方法能实时准确地预测烧结过程FeO含量,为烧结过程的智能化调控提供实时有效的FeO含量反馈信息.

关键词： FeO含量预测烧结过程数据知识变权重回声状态网络信息融合

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连续变焦红外热像仪结构设计及装调工艺研究

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激光与红外 2024年第3期54卷 404-410页

作者：石彰贺媛潘栋中电科光电科技有限公司北京100015

本文研究了连续变焦红外热像仪的结构设计和装调工艺。在设计阶段进行了振动、冲击仿真分析。提出了连续变焦组件的光机装调工艺方法。搭建了小视场与安装基准偏轴度的测量方法。完成了该红外热像仪的光轴一致性检测和光轴稳定性验证试... 详细信息

本文研究了连续变焦红外热像仪的结构设计和装调工艺。在设计阶段进行了振动、冲击仿真分析。提出了连续变焦组件的光机装调工艺方法。搭建了小视场与安装基准偏轴度的测量方法。完成了该红外热像仪的光轴一致性检测和光轴稳定性验证试验。检测和试验验证结果表明各项关键机械性能指标优良,证明该红外热像仪的整机系统结构设计满足工程化应用需求。

关键词：红外热像仪连续变焦装调工艺

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