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Gradient age-precipitation behavior induced by gradient nano-grain in Mg-Gd-Ag-Zr alloy

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Journal of Iron and Steel Research International 2025年第1期32卷 19-24页

作者： Bang-jun Li Jia-peng Sun Jing Han Guo-song Wu College of Materials Science and Engineering Hohai UniversityNanjing 210024JiangsuChina School of Mechanical and Electrical Engineering China University of Mining and TechnologyXuzhou 221116JiangsuChina

Gradient nano-grained structure is frequently engineered into metallic materials,including Mg alloys,to achieve superior combination of strength and ***,the influence of this microstructural feature on aging precipitation behavior remains inadequately *** this study,the age-precipitation behavior of a gradient nano-grained Mg-Gd-Ag-Zr alloy prepared via ultrasonic severe surface rolling was *** result indicates that the aging precipitation behavior exhibits a depth-dependent variation within this *** the nano-grained surface layer,hierarchicalβnano-precipitates are predominant,while at greater depths,the precipitates consist ofβnanoparticles located at grain boundaries,along with intragranularβ′andγ″*** formation ofβnano-precipitates deviates from the conventional precipitation behavior observed in Mg-Gd-Ag alloys,and is attributed to the high density of defects induced by the surface nano-grained *** finding advances our understanding of the precipitation behavior in the alloys with heterogeneous microstructure.

关键词： Mg alloy Gradient Precipitation Aging behavior Microstructure

Interpretable Data-Driven Learning With Fast Ultrasonic Detection for Battery Health Estimation

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IEEE/CAA Journal of Automatica Sinica 2025年第1期12卷 267-269页

作者： Kailong Liu Yuhang Liu Qiao peng Naxin Cui Chenghui Zhang the School of Control Science and Engineering Shandong University the Information Technology Analytics & Operations GroupQueen's University Belfast

Dear Editor,Health management is essential to ensure battery performance and safety, while data-driven learning system is a promising solution to enable efficient state of health(SoH) estimation of lithium-ion(Liion) batteries. However, the time-consuming signal data acquisition and the lack of interpretability of model still hinder its efficient deployment. Motivated by this, this letter proposes a novel and interpretable data-driven learning strategy through combining the benefits of explainable AI and non-destructive ultrasonic detection for battery SoH estimation. Specifically, after equipping battery with advanced ultrasonic sensor to promise fast real-time ultrasonic signal measurement, an interpretable data-driven learning strategy named generalized additive neural decision ensemble(GANDE) is designed to rapidly estimate battery SoH and explain the effects of the involved ultrasonic features of interest.

关键词： Electronic health record

Microstructure characteristics and corrosion behavior of metal inert gas welded dissimilar joints of 6005A modified by Sc and 5083 alloys

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Transactions of Nonferrous Metals Society of China 2025年第1期35卷 60-76页

作者： Guo-fu XU Liang LIU Ying DENG Yu ZENG Jun-chang CAO Lei TANG Xiao-yan peng Jia-qi DUAN Mei-chan LIANG Qing-lin PAN School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Power Metallurgy Central South UniversityChangsha 410083China Baoshan Iron&Steel Co. Ltd.Shanghai 201900China Warwick Manufacturing Group The University of WarwickCoventryCV47ALUK Guangdong Weiye Aluminum Factory Group Co. Ltd.Foshan 528000China

The corrosion behavior and microstructure characteristics of metal inert gas(MIG)welded dissimilar joints of the 6005A alloy modified with Sc(designated as 6005A+Sc)and the 5083 alloy were investigated using corrosion tests and microscopy *** show that the dissimilar joints exhibit strong stress corrosion cracking(SCC)resistance,maintaining substantial strength during slow strain rate tensile ***,the heat-affected zone(HAZ)and base metal(BM)on the 6005A+Sc side show superior performance in terms of inter-granular corrosion(IGC)and exfoliation corrosion(EXCO)compared to the corresponding zones on the 5083 *** lower corrosion resistance of the 5083-BM and the 5083-HAZ can be attributed to the presence of numerous Al_(2)Mg_(3)phases and micro-scaled Al_(6)(Mn,Fe)intermetallics,mainly distributed along the rolling ***,the enhanced corrosion resistance of the 6005A+Sc-BM and the 6005A+Sc-HAZ can be attributed to the discontinuously distributed grain boundary precipitates(β-Mg_(2)Si),the smaller grain size,and the reduced corrosive current density.

关键词： metal inert gas welding dissimilar joint aluminum alloy corrosion,microstructure

Application of FTIR two-dimensional correlation spectroscopy(2D-COS)analysis in characterizing environmental behaviors of microplastics:A systematic review

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Journal of Environmental Sciences 2025年第1期147卷 200-216页

作者： Shuang peng Feipeng Wang Dongbin Wei Cuiping Wang Haijun Ma Yuguo Du Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China North Minzu University Yinchuan 750001China

Microplastics(MPs)are ubiquitous in the environment,continuously undergo aging processes and release toxic chemical *** the environmental behaviors of MPs is critical to accurately evaluate their long-term ecological *** twodimensional correlation spectroscopy(2D-COS)is a powerful tool for MPs studies,which can dig more comprehensive information hiding in the conventional one-dimensional spectra,such as infrared(IR)and Raman *** recent applications of 2D-COS in analyzing the behaviors and fates of MPs in the environment,including their aging processes,and interactions with natural organicmatter(NOM)or other chemical substances,were summarized *** main requirements and limitations of current approaches for exploring these processes are discussed,and the corresponding strategies to address these limitations and drawbacks are proposed as ***,new trends of 2D-COS are prospected for analyzing the properties and behaviors of MPs in both natural and artificial environmental processes.

关键词： Microplastics(MPs) 2D-COS application Aging processes Interactions

Recent progress on non-metallic carbon nitride for the photosynthesis of H_(2)O_(2):Mechanism,modification and in-situ applications

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Chinese Chemical Letters 2025年第1期36卷 165-175页

作者： Hao Lv Zhi Li peng Yin Ping Wan Mingshan Zhu College of Environment and Climate Jinan UniversityGuangzhou 511443China Jiading Branch of Shanghai General Hospital Shanghai Jiao Tong University School of MedicineShanghai 201803China Department of Liver Surgery Ren Ji HospitalShanghai Jiao Tong University School of MedicineShanghai 200127China

Photocatalytic hydrogen peroxide(H_(2)O_(2))production has been considered as a promising strategy for H_(2)O_(2)synthesis due to its environmentally *** various photocatalysts,carbon nitride-based materials are excellent candidates for H_(2)O_(2)production because of their excellent visible-light response,low cost and high *** this review,we summarize in detail the research progress on the photocatalytic production of H_(2)O_(2)by carbon ***,we summarize the basic principles of photocatalysis and photocatalytic H_(2)O_(2)***,the classification and modification methods of carbonnitride-based materials are discussed,including morphology modulation,noble metal loading,defect control,heterojunction regulation,molecular structure engineering and elemental ***,the different in-situ applications of H_(2)O_(2)via photosynthesis were discussed,including disinfection and antibiotic resistant genes degradation,organic pollutants degradation,medical applications and fine chemical *** review brings great promise for in-situ H_(2)O_(2)photosynthesis,which is expected to serve as a key component in future applications.

关键词： Carbon nitride Hydrogen peroxide Photocatalysis Applications

Experimental Research on a Feasible Building Insulation Material Based Reed in China

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Journal of Thermal Science 2025年第1期34卷 176-187页

作者： LIU Tiantian peng Yizhe LIU Lifang CAI Chenghan WANG Shuang LI Hongqiang College of Civil Engineering Hunan UniversityChangsha 410082China College of Civil Engineering Hunan University of Science and TechnologyXiangtan 411201China School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212100China National Center for International Research Collaboration in Building Safety and Environment(NCIRCBSE) Hunan UniversityChangsha 410082China Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education Hunan UniversityChangsha 410082China

The seemingly useless reeds are prepared as thermal insulation materials,which not only meet the requirements of environmental sustainability but also enhance the added value of reeds,creating new economic *** hydrophobicity of raw biomass surfaces leads to problems such as weak bonding strength and non-dense structure in the formed materials,as well as issues related to the residual insect infestations on the *** this study,reed straw was used as the raw material,and foamed geopolymer was used as the binder to prepare building insulation materials based *** improve the interfacial adhesion performance between reed straw and foamed geopolymer,a thermochemical modification method-thermal carbonization,was *** this study,the mechanical properties and hydraulic properties of the studied materials with different degrees of surface thermal modification were tested,especially the fire resistance performance,and weathering resistance performance rarely found in published *** the surface thermal modification condition of reed straw was 250℃(30 min),the comprehensive performance of reed-based building insulation materials was the best,when the studied material density was 321.3 kg/m^(3);the compressive strength was 0.59 MPa;the thermal conductivity was 0.101 W/(m·K);the pH was 11.27;the moisture absorption rate was 25.1%,and the compressive strength loss rate in wet-dry cycles was 18.5%.In addition,it had excellent fire resistance performance and weathering resistance *** new material can be widely used to improve the thermal insulation of traditional buildings and as sandwich filler in prefabricated buildings,such as preparing insulating walls.

关键词： pre-treatment of reeds interface adhesion properties building insulation material based reed fire resistance performance weathering resistance performance

Performance Analysis of a Coupled System based on Organic Rankine Cycle and Double Effect Absorption Refrigeration for Waste Heat Recovery in Data Center

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Journal of Thermal Science 2025年第1期34卷 188-205页

作者： LI peng XU Jiaqi WANG Binbin LIU Jianyang ZHAO Wensheng HAN Zhonghe School of Energy Power and Mechanical Engineering North China Electric Power UniversityBaoding 071003China Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology North China Electric Power UniversityBaoding 071003China

During data center operation,it generates a significant volume of low-grade waste *** recover waste heat,a coupled system including solar collector,double effect absorption refrigeration and organic Rankine cycle is *** system performance is analyzed in *** the organic Rankine cycle,five organic working fluids(R245fa,R245ca,R123,R11,and R113)are selected.R245fa,R113 and R245ca obtain the maximum net power output,thermal efficiency and exergy efficiency,*** the double effect absorption refrigeration system,the evaporation temperature,condensation temperature,and generation pressure affect the COP and exergy *** the generator pressure is unchanged,the COP increases with increasing evaporation temperature and decreasing condensation *** the COP reaches 1.3,the COP slightly decreases as the evaporation temperature or condensation temperature ***,the exergy efficiency of refrigeration systems exhibits the same trend as the COP,and the exergy efficiency maximum value appears at approximately 0.32.A new performance indicator,rPUE,was defined to evaluate the data center power utilization *** flow distribution ratio and heat source temperature were optimized with multi-objective *** the mass flow distribution rate is 0.6 and the heat source temperature is 441.5 K,rPUE and the total unit production costs of the system obtain the optimal solution.

关键词： data center solar heat collection organic Rankine cycle double effect absorption refrigeration waste heat recovery

风机12.9级叶根螺栓极限及疲劳承载影响因素分析

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华中科技大学学报(自然科学版) 2025年第1期53.0卷 86-91+106页

作者：罗胜曦谢东洋解轲彭宁中船海装风电有限公司

为揭示风机叶片12.9级高强度叶根螺栓极限及疲劳承载特性，建立了叶根螺栓预埋螺栓套连接完整有限元模型，分析螺栓自身设计参数缩颈、不同屈服比例的预紧力对叶根极限承载的影响规律，进而研究不同设计参数下螺栓应力范围．搭建12.9级... 详细信息

为揭示风机叶片12.9级高强度叶根螺栓极限及疲劳承载特性，建立了叶根螺栓预埋螺栓套连接完整有限元模型，分析螺栓自身设计参数缩颈、不同屈服比例的预紧力对叶根极限承载的影响规律，进而研究不同设计参数下螺栓应力范围．搭建12.9级叶根螺栓疲劳试验平台，测试螺栓疲劳等级，突破现有规范对疲劳等级的取值，以及不同参数取值下螺栓的S/N曲线．基于马尔科夫载荷矩阵研究不同S/N曲线、不同设计参数下叶根螺栓疲劳承载的关联关系．结果表明：螺栓施加同一屈服比例的预紧力时，缩颈越大，极限承载能力越高；疲劳载荷过大时，接触面螺栓附近开口出现，弯矩非线性增加，此时缩颈将不能降低螺栓应力范围；螺栓S/N曲线指数取值越大，疲劳损伤越小；若能突破疲劳等级的取值，螺栓设计参数对疲劳损伤的制约将大幅降低．

关键词：叶根螺栓预埋螺栓套极限疲劳承载马尔科夫矩阵有限元模型

Investigation of magnesium phosphate cement on river dredged sludge with varying humic acid content and solidification mechanism

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Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 573-585页

作者： Xiaoyi Yuan Lei peng Bing Chen Department of Civil Engineering Shanghai Jiao Tong UniversityShanghai200240China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai200240China

This paper investigated the use of magnesium phosphate cement (MPC) for solidifying sludge with different humic acid (HA) content (ranging from 0 to 4.5%) and explored the solidification mechanism. Fluidity, setting time, unconfined compressive strength (UCS), the strength formation mechanism, and the spontaneous imbibition process of solidified sludge (SS) were studied. The results indicate that MPC can be used as a low-alkalinity curing agent. As the HA content increases, fluidity and setting time also increase, while hydration temperature and strength decrease. Additionally, the failure mode of SS transitions from brittleness to ductility. The strength of SS is composed of the cementation strength provided by MPC hydration products, matric suction, osmotic suction, and the structural strength of the sludge. MPC reduces the structural strength caused by the shrinkage of pure sludge under the action of matric suction, but the incorporation of MPC significantly improved the strength when the sludge is eroded by water. X-ray diffraction (XRD) and scanning electron microscopy (SEM) show that the sludge and MPC can form a dense solid body, forming various hydration products, and synergistically improve the mechanical properties of the sludge.

关键词： Sludge solidification MPC Unsaturated spontaneous imbibition Strength mechanism Humic acid