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Normalized fatigue properties of asphalt mixture at various temperatures

Journal of Road Engineering 2023年第3期3卷 279-287页

作者： Dongdong Ge Zihao Ju Defeng Duan Songtao Lyu Weiwei Lu chaochao liu Key Laboratory of Special Environment Road Engineering of Hunan Province Changsha University of Science and TechnologyChangsha 410114China National Engineering Research Center of Highway Maintenance Technology Changsha University of Science and TechnologyChangsha 410114China CCCC-SHB Fourth Engineering Co. Ltd.Luoyang 471000China

This study normalized the mixture's fatigue behavior at various temperatures,and the strength and fatigue tests of the mixture were conducted.The stress state of the asphalt mixture includes direct tensile,uniaxial compression,and indirect tensile.The Desai yield surface and fatigue path were proposed.And a normalized fatigue characteristics model of the mixture was established.The following conclusions were obtained.With the increases in the loading rate,the strength of the asphalt mixture increased.As the temperature increases,the strength of the mixture is reduced.At various temperatures and rates,the strength forms a closed curved surface.The Desai strength yield surface was established,which forms a closed curved surface.When the loading rate and temperature are below a certain critical line,the asphalt mixture will not undergo strength damage.At a fixed stress state,the fatigue damage path of the mixture was determined.The stress ratio was determined considering the influence of the loading rate.In this way,a normalized model can be described to express the asphalt mixture fatigue properties at various temperatures and stress levels.For the asphalt mixture in an indirect tensile state,the normalized fatigue equation parameter is 4.09.This model is more suitable for reflecting the viscous-elastic behavior of the mixtures than the fatigue equation determined by the notional stress ratio.

关键词： Asphalt mixture Normalization equation Load rates Test temperature Stress level Desai yield surface

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知识产权还是科研诚信:美国制裁涉华科技人才法律措施研究——以“中国行动计划”为例

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中国科技论坛 2024年第5期 169-177页

作者：肖冰刘超超魏莱中国科学院科技战略咨询研究院北京100190 中国网络空间研究院北京100048 中国科学院人事局北京100864

2018年末至2022年初,受“中国行动计划”影响,中国海外人才引进工作遭遇困难。“中国行动计划”实施情况显示,其舆论宣传和政策实践方面存在显著差异,知识产权是宣传的主要议题,科研诚信是实践的核心要旨。因此,相较于知识产权方面的问... 详细信息

2018年末至2022年初,受“中国行动计划”影响,中国海外人才引进工作遭遇困难。“中国行动计划”实施情况显示,其舆论宣传和政策实践方面存在显著差异,知识产权是宣传的主要议题,科研诚信是实践的核心要旨。因此,相较于知识产权方面的问题而言,科研诚信应该成为中国应对和防控海外人才引进工作法律风险的重点。在应对措施方面,要在加强立法工作统筹协调的同时重视法规的可实施性,确保各项规定能在人才工作中得到落实。

关键词：知识产权科研诚信法律制裁中国行动计划

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动态监测血浆SOD、CysC、KIM-1水平对老年脓毒症患者发生急性肾损伤风险的预测价值

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武汉大学学报（医学版） 2024年第4期45卷 442-445,450页

作者：苟丽霞刘朝朝陈娜南京航空航天大学医院检验科江苏南京210000 南京医科大学第四附属医院呼吸科江苏南京211106 明基医院检验科江苏南京210000

目的:探讨老年脓毒症患者血浆超氧化物歧化酶(SOD)、胱抑素C(CysC)、肾损伤分子-1(KIM-1)水平对急性肾损伤(AKI)发生风险的预测价值。方法:选取入住南京医科大学第四附属医院并诊断为脓毒症的162例患者为研究对象,根据住院期间有无并发... 详细信息

目的:探讨老年脓毒症患者血浆超氧化物歧化酶(SOD)、胱抑素C(CysC)、肾损伤分子-1(KIM-1)水平对急性肾损伤(AKI)发生风险的预测价值。方法:选取入住南京医科大学第四附属医院并诊断为脓毒症的162例患者为研究对象,根据住院期间有无并发AKI将其分为AKI组114例和非AKI组48例。分析血浆SOD、CysC、KIM-1水平对老年脓毒症患者发生AKI风险的预测价值。结果:AKI组24、36、72 h血浆CysC、KIM-1水平均高于非AKI组,SOD水平均低于非AKI组(P<0.05);与0 h相比,AKI组24、36、72 h血浆CysC、KIM-1水平升高,SOD水平降低(P<0.05)。血浆SOD、CysC、KIM-1水平三者联合预测的ROC曲线下面积(AUC)为0.948,特异性为93.7%,敏感度为84.2%。KIM-1是老年脓毒症患者发生AKI的独立危险因素(P<0.05),SOD是老年脓毒症患者发生AKI的保护因素(P<0.05)。结论:老年脓毒症患者并发AKI后血浆CysC、KIM-1水平升高,SOD水平降低,联合检测血浆SOD、CysC、KIM-1可早期预测老年脓毒症患者AKI发生风险,有一定的临床参考价值。

关键词：老年脓毒症超氧化物歧化酶胱抑素C 肾损伤分子-1 急性肾损伤预测价值

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航空发动机吞水试验技术研究

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科技资讯 2024年第9期22卷 81-83页

作者：满达王歆童张海幸刘超超中国航发沈阳发动机研究所辽宁沈阳110015

飞机在雨天飞行时,航空发动机会吞入空气中的雨水。当航空发动机吸入大量的雨水时,可能引起机匣与叶片之间摩擦损坏,也可能造成航空发动机喘振或熄火,严重威胁飞机的飞行安全。基于此,介绍了航空发动机吸入雨水后对稳定性可能造成的影响... 详细信息

飞机在雨天飞行时,航空发动机会吞入空气中的雨水。当航空发动机吸入大量的雨水时,可能引起机匣与叶片之间摩擦损坏,也可能造成航空发动机喘振或熄火,严重威胁飞机的飞行安全。基于此,介绍了航空发动机吸入雨水后对稳定性可能造成的影响,航空发动机吞水试验对试验用水、水滴直径、吞水量、液态水分布和试车过程的要求以及航空发动机吞水试验完成指标。同时,介绍了吞水试验设备的主要组成,包括喷水设备、液压站、测控系统以及储水设备,并介绍了各组成部分的功用。

关键词：吞水试验试验要求完成指标设备组成

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某型航空发动机高压直流电负载系统设计

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自动化应用 2024年第7期65卷 83-86页

作者：刘超超朱哲民陈子杭赵永中国航发沈阳发动机研究所辽宁沈阳110015

为满足某型航空发动机功率分出试验要求,设计了一套高压直流电负载系统,介绍了系统的组成架构、软硬件设计思路、实现方法以及功能特点。该系统通过对负载电阻档位进行科学设计,并充分发挥PLC和组态软件配置灵活、自动化控制能力强的优... 详细信息

为满足某型航空发动机功率分出试验要求,设计了一套高压直流电负载系统,介绍了系统的组成架构、软硬件设计思路、实现方法以及功能特点。该系统通过对负载电阻档位进行科学设计,并充分发挥PLC和组态软件配置灵活、自动化控制能力强的优势,利用软硬件的配合设计,实时控制和监视电负载系统状态,实现与加载载荷谱连锁进行自动加载及实时功率自动补偿,提高了电负载系统的自动化控制水平及控制精度。通过在发动机试验中进行充分验证,结果表明,该系统具有较高的自动控制能力以及较高的稳定性和准确性。

关键词：航空发动机高压直流电负载系统可编程逻辑控制器组态软件自动加载功率自动补偿

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The tomato 2-oxoglutarate-dependent dioxygenase gene SlF3HL is critical for chilling stress tolerance

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Horticulture Research 2019年第1期6卷 1153-1164页

作者： Tixu Hu Yuqin Wang Qiqi Wang Ningning Dang Ling Wang chaochao liu Jianhua Zhu Xiangqiang Zhan State Key Laboratory of Crop Stress Biology for Arid Areas and College of Horticulture Northwest A&F UniversityNo.3Taicheng Road712100 YanglingShaanxiChina School of Biotechnology Jiangsu University of Science and TechnologyZhenjiangJiangsuChina Department of Plant Science and Landscape Architecture College of Agriculture and Natural ResourcesUniversity of MarylandCollege ParkMD 20742USA

Low temperature is a major stress that severely affects plant development,growth,distribution,and productivity.Here,we examined the function of a 2-oxoglutarate-dependent dioxygenase-encoding gene,SlF3HL,in chilling stress responses in tomato(Solanum lycopersicum cv.Alisa Craig[AC]).Knockdown(KD)of SlF3HL(through RNA interference)in tomato led to increased sensitivity to chilling stress as indicated by elevated levels of electrolyte leakage,malondialdehyde(MDA)and reactive oxygen species(ROS).In addition,the KD plants had decreased levels of proline and decreased activities of peroxisome and superoxide dismutase.The expression of four cold-responsive genes was substantially reduced in the KD plants.Furthermore,seedling growth was significantly greater in AC or SlF3HLoverexpression plants than in the KD plants under either normal growth conditions with methyl jasmonate(MeJA)or chilling stress conditions.SlF3HL appears to positively regulate JA accumulation and the expression of JA biosynthetic and signaling genes under chilling stress.Together,these results suggest that SlF3HL is a positive regulator of chilling stress tolerance and functions in the chilling stress tolerance pathways,possibly by regulating JA biosynthesis,JA signaling,and ROS levels.

关键词： elevated stress chilling

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Review of advanced road materials, structures, equipment, and detection technologies

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Journal of Road Engineering 2023年第4期3卷 370-468页

作者： JRE Editorial Office Maria Chiara Cavalli De Chen Qian Chen Yu Chen Augusto Cannone Falchetto Mingjing Fang Hairong Gu Zhenqiang Han Zijian He Jing Hu Yue Huang Wei Jiang Xuan Li chaochao liu Pengfei liu Quantao liu Guoyang Lu Yuan Ma Lily Poulikakos Jinsong Qian Aimin Sha Liyan Shan Zheng Tong B.Shane Underwood Chao Wang Chaohui Wang Di Wang Haopeng Wang Xuebin Wang Chengwei Xing Xinxin Xu Min Ye Huanan Yu Huayang Yu Zhe Zeng You Zhan Fan Zhang Henglong Zhang Wenfeng Zhu Editorial Office of Journal of Road Engineering Chang’an UniversityXi’an 710064China Department of Civil and Architectural Engineering KTH Royal Institute of TechnologyStockholm 10044Sweden School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China School of Highway Chang’an UniversityXi’an 710064China Department of Civil Engineering Aalto UniversityAalto 00076Finland School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China National Engineering Research Center of Highway Maintenance Equipment Chang’an UniversityXi’an 710064China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina School of Transportation Southeast UniversityNanjing 211189China Institute for Transport Studies University of LeedsLeeds LS29JTUK School of Traffic and Transportation Engineering Changsha University of Science&TechnologyChangsha 410114China Institute of Highway Engineering RWTH Aachen UniversityAachen 52074Germany State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Department of Architecture and Civil Engineering City University of Hong KongHong KongChina Empa Swiss Federal Laboratories for Materials Science and TechnologyDübendorf 8600Switzerland College of Transportation Engineering Tongji UniversityShanghai 200092China School of Transportation Science and Engineering Harbin Institute of TechnologyHarbin 150090China Department of Civil Constructionand Environmental EngineeringNorth Carolina State UniversityRaleighNC 27695USA Department of Road&Urban Railway Engineering Beijing University of TechnologyBeijing 100124China Department of Civil and Environmental Engineering University of LiverpoolLiverpool L693GHUK School of Civil Engineering&Transportation South China University of TechnologyGuangzhou 510640China College of Civil Engineering Hunan UniversityChangsha 410082China

As a vital and integral component of transportation infrastructure,pavement has a direct and tangible impact on socio-economic sustainability.In recent years,an influx of groundbreaking and state-of-the-art materials,structures,equipment,and detection technologies related to road engineering have continually and progressively emerged,reshaping the landscape of pavement systems.There is a pressing and growing need for a timely summarization of the current research status and a clear identification of future research directions in these advanced and evolving technologies.Therefore,Journal of Road Engineering has undertaken the significant initiative of introducing a comprehensive review paper with the overarching theme of“advanced road materials,structures,equipment,and detection technologies”.This extensive and insightful review meticulously gathers and synthesizes research findings from 39 distinguished scholars,all of whom are affiliated with 19 renowned universities or research institutions specializing in the diverse and multidimensional field of highway engineering.It covers the current state and anticipates future development directions in the four major and interconnected domains of road engineering:advanced road materials,advanced road structures and performance evaluation,advanced road construction equipment and technology,and advanced road detection and assessment technologies.

关键词： Road engineering Advanced road material Advanced road structure Advanced road equipment Advanced road detection technology

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Tuning exciton dynamics by the dielectric confinement effect in quasi-two-dimensional perovskites

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Photonics Research 2024年第3期12卷 563-570页

作者： MINGHUAN CUI chaochao QIN YUANZHI JIANG SHICHEN ZHANG CHANGJIU SUN MINGJIAN YUAN YONGGANG YANG YUFANG liu Henan Key Laboratory of Infrared Materials&Spectrum Measures and Applications Henan Normal UniversityXinxiang 453007China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China Institute of Physics Henan Academy of SciencesZhengzhou 450046China

The dielectric confinement effect plays an essential role in optoelectronic devices.Existing studies on the relationship between the dielectric confinement and the photoelectric properties are inadequate.Herein,three organic spacers with different dielectric constants are employed to tune the exciton dynamics of quasi-two-dimensional(quasi-2D)Ruddlesden–Popper perovskite films.Femtosecond transient absorption spectroscopy reveals that the small dielectric constant ligand enables a weak dynamic disorder and a large modulation depth of the coherent phonons,resulting in a more complete energy transfer and the inhibition of a trap-mediated nonradiative recombination.Additionally,the increase in the bulk-ligand dielectric constant reduces the corresponding exciton binding energy and then suppresses the Auger recombination,which is beneficial for high-luminance lightemitting diodes.This work emphasizes the importance of dielectric confinement for regulating the exciton dynamics of layered perovskites.

关键词： dielectric perovskite quasi

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冷轧DC01钢板屈服强度偏高的原因

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热处理 2024年第1期39卷 58-60页

作者：宋小伟王立红果超李立仁赵海生刘超超山西建龙实业有限公司技术中心山西运城043801

冷轧DC01钢板屈服强度高于要求的≤240 MPa。为此对屈服强度偏高的冷轧DC01钢板进行了化学成分分析、金相检验以及冷轧压下率、退火工艺和平整延伸率的复查。结果表明:钢板的含氮量偏高,退火过程中析出的AlN量过多,阻碍晶粒的回复和再结... 详细信息

冷轧DC01钢板屈服强度高于要求的≤240 MPa。为此对屈服强度偏高的冷轧DC01钢板进行了化学成分分析、金相检验以及冷轧压下率、退火工艺和平整延伸率的复查。结果表明:钢板的含氮量偏高,退火过程中析出的AlN量过多,阻碍晶粒的回复和再结晶,导致其屈服强度偏高。通过控制DC01钢的含氮量≤60×10^(-6)和调整退火工艺,冷轧DC01钢板的屈服强度达到了要求。

关键词：冷轧板含氮量屈服强度 AlN

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Impacts of major volcanic eruptions over the past two millennia on both global and Chinese climates:A review

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Science China Earth Sciences 2024年第1期67卷 61-78页

作者： Weiyi SUN Deliang CHEN Guonian LÜ Liang NING chaochao GAO Renhe ZHANG Bin WANG Jian liu Key Laboratory for Virtual Geographic Environment Ministry of EducationState Key Laboratory Cultivation Base of Geographical Environment Evolution of Jiangsu ProvinceJiangsu Center for Collaborative Innovation in Geographical Information Resource Development and ApplicationSchool of Geography ScienceNanjing Normal UniversityNanjing 210023China Regional Climate Group Department of Earth SciencesUniversity of GothenburgGothenburg 40530Sweden College of Environmental and Resource Science Zhejiang UniversityHangzhou 310058China Department of Atmospheric and Oceanic Sciences&Institute of Atmospheric Sciences Fudan UniversityShanghai 200437China Department of Atmospheric Sciences and Atmosphere-Ocean Research Center University of Hawaii at ManoaHonoluluHI 96825USA Jiangsu Provincial Key Laboratory for Numerical Simulation of Large Scale Complex Systems School of Mathematical ScienceNanjing Normal UniversityNanjing 210023China Open Studio for the Simulation of Ocean-Climate-Isotope Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

Major volcanic eruptions(MVEs)have attracted increasing attention from the scientific community.Previous studies have explored the climatic impact of MVEs over the past two millennia.However,proxy-based reconstructions and climate model simulations indicate divergent responses of global and China’s regional climates to MVEs.Here,we used multiple data from observations,reconstructions,simulations,and assimilations to summarize the historical facts of MVEs,the characteristics and mechanisms of their climatic impact,and directions for future research.We reviewed volcanic datasets and determined intensive MVE periods;these periods corresponded to the years 530–700,1200‒1460,and 1600‒1840 CE.After tropical MVEs,a substantial cooling effect is observed throughout the globe and China on the interannual-interdecadal time scales but an inconsistent cooling magnitude is detected between reconstructions and simulations.In the first summer after tropical MVEs,a decrease in global and monsoonal precipitation is observed.In reconstructions and simulations,an increased precipitation is seen for the Yangtze River Basin,while large uncertainties in precipitation changes are present for other regions of China.Decadal drought can be induced by frequent eruptions and volcanism superimposed on low solar irradiation and internal variability.MVEs affect climate directly through the radiative effect and indirectly by modulating internal variability,such as the El Niño‒Southern Oscillation(ENSO)and Atlantic Multidecadal Oscillation(AMO).However,changes in the phase,amplitude,and periodicity of ENSO and AMO after MVEs and the associated mechanisms remain controversial,which could account for model-reconstruction disagreements.Moreover,other internal variability,uncertainties in reconstruction methods and aerosol‒climate models,and climate background may also induce model-reconstruction disagreements.Knowledge gaps and directions for future research are also discussed.

关键词： Major volcanic eruption Climate variability Mechanism Past two millennia Internal variability

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