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Broadband low-frequency sound absorption of multifunctional composite metastructure

Science China(Technological Sciences) 2025年第2期68卷 114-124页

作者： Yilong YANG Shanshan liu Yan LI Tong GAO yongdong PAN yong LI Yabin JIN School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China State International Joint Research Center of Aerospace Design and Additive Manufacturing Northwestern Polytechnical UniversityXi’an 710072China Institute of Acoustics School of Physics Science and EngineeringTongji UniversityShanghai 200092China Shanghai Key Laboratory of Intelligent Sensing and Detection Technology School of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China Shanghai Institute of Aircraft Mechanics and Control Shanghai 200092China

In this study,we fabricated multifunctional metastructures from carbon fiber-reinforced plastic composites using additive manufacturing *** metastructures are characterized by their lightweight,load-bearing capacity,and broadband low-frequency sound absorption *** metastructure consists of 36 unit cells,and non-local coupling mechanism was considered for designing the sound absorption *** developed an acoustic impedance theory tailored for the metastructure,facilitating an analysis of thermal and viscous dissipation *** is proven theoretically and experimentally that the proposed composite metastructure can achieve a noise reduction with an average sound absorption coefficient greater than 0.9 across frequencies in the rage of 330-1500 *** also studied the metastructure’s quasi-static and cyclic compression performance,confirming its efficient absorption capabilities after cyclic *** proposed design and additive manufacturing method for composite metastructures provides a novel pathway for creating lightweight,multifunctional structures with diverse applications,such as aerospace engineering.

关键词： composite metastructure broadband sound absorption additive manufacturing

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Facilitation of microbialite development by continental weathering in the Cambrian Zhangxia Formation,southern North China Block

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Journal of Palaeogeography 2025年第1期14卷 172-185页

作者： Wen-Tao Yang Jia-Qi Zhu Min Wang Chao liu yong-An Qi School of Resources and Environment Henan Polytechnic University Key Laboratory of Biogenic Traces and Sedimentary Minerals of Henan Province Henan Polytechnic University State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of Sciences

We report geochemical data for carbonate rocks from the Cambrian Zhangxia Formation,southern North China Block,including trace-element contents and C,O,and Sr isotopic compositions,to determine the controls on the development of microbialites in this *** sedimentary environment of the Zhangxia Formation evolved from carbonate-slope through platform-margin-reef to ooid-shoal,and then to open-platform settings,corresponding to the development of micrites,microbialites,and oolitic *** data show that δ13C values decrease upwards through the Zhangxia Formation,from 0.99‰to-1.59‰,whereas δ18O values increase from-9.91‰to-7.10‰.Total rare earth element （REE）contents decrease upwards through the stratigraphy,and the contents of Th and Sc show a similar trend.87Sr/86Sr ratios reach a maximum of 0.710544 in the horizons of microbialite development,Member 2 of the Zhangxia Formation,above which the ratios are uniform,with a mean value of *** these geochemical data with the inferred sedimentary evolution,the Zhangxia Formation is interpreted to have formed in a depositional environment that changed from transgression to *** weathering played a crucial role in promoting the input of terrigenous materials,which in turn favored the development of microbialites during the early stage of deposition of the Zhangxia Formation.

关键词： Carbonate rocks Trace elements C and Sr isotopes Microbialites Cambrian

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Fast Coordinated Power Control for Improving Inertial and Voltage Support Capability of Battery Energy Storage Systems

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CSEE Journal of Power and Energy Systems 2025年第1期11卷 280-295页

作者： Zhen Gong Chengxi liu Filipe Faria Da Silva yonghao gui Claus Leth Bak School of Electrical Engineering and Automation Wuhan UniversityWuhan430072China Department of Energy Technology Aalborg University9220 AalborgDemark Department of Electronic Systems Aalborg University9220 AalborgDenmark

This paper proposes a fast coordinated power control method based on two augmented channels(AC)in battery energy storage system(BESS)to improve inertial and voltage support capability,i.e.,a frequency-reactive power channel(FRPC)and a voltage-real power channel(VRPC).For frequency control in the power distribution system with high resistance/inductance ratio,the coupling mechanism between rate of change of frequency(RoCoF)and required reactive power(RRP)of grids is analyzed,indicating RoCoF is proportional to ***,RoCoF is utilized in FRPC to generate reactive power for complementary inertial emulating ***,for voltage control,coupling characteristics between rate of change of voltage(RoCoV)and demanding real power(DRP)of grids is also studied,revealing RoCoV is proportional to ***,it can be adopted in VRPC to generate real power for complementary voltage ***,grid-voltage-modulated direct power control is selected as the inner power control loop to track power references with faster dynamic performance compared with traditional vector-oriented ***,simulations and hardware-in-loop experiments validate improvement in performance of grid frequency and voltage control based on the proposed method.

关键词： Augmented channels direct power control frequency-reactive power channel(FRPC) inertial and voltage support voltage-real power channel(VRPC)

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CMOS direct conversion X-ray detector coupled with fluorinated liquid

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Nuclear Science and Techniques 2025年第1期36卷 59-68页

作者： Shi-Hua liu Chao-Song Gao Xin Zhang Xiang-Ming Sun Meng Wu Zhi-Hui Han Tong Wan yong-Shuai Ge Key Laboratory of Quark&Lepton Physics(MOE) Central China Normal UniversityWuhan 430079China guizhou Education University Guiyang 550018China Research Center for Medical Artificial Intelligence Chinese Academy of SciencesShenzhen Institutes of Advanced TechnologyShenzhen 518055China

X-ray detectors show potential applications in medical imaging,materials science,and nuclear *** achieve high detection efficiency and spatial resolution,many conventional semiconductor materials,such as amorphous selenium,cadmium telluride zinc,and perovskites,have been utilized in direct conversion X-ray ***,these semiconductor materials are susceptible to temperature-induced performance degradation,crystallization,delamination,uneven lattice growth,radiation damage,and high dark *** study explores a new approach by coupling an FC40 electronic fluorinated liquid with a specialized high-resolution and high-readout-speed complementary metal-oxide-semiconductor(CMOS)pixel array,specifically the Topmetal II−chip,to fabricate a direct conversion X-ray *** fluorinated liquid FC40(molecular formula:C_(21)F_(48)N_(2))is an electronic medium that is minimally affected by temperature and displays no issues with uniform *** exhibits a low dark current and minimal radiation damage and enables customizable thickness in X-ray *** addresses the limitations inherent in conventional semiconductor-based *** this study,simple X-ray detector imaging tests were conducted,demonstrating the excellent coupling capability between FC40 electronic fluorinated liquid and CMOS chips by the X-ray detector.A spatial resolution of 4.0 lp/mm was measured using a striped line par card,and a relatively clear image of a cockroach was displayed in the digital radiography imaging *** test results indicated the feasibility of fabricating an X-ray detector by combining FC40 electronic fluorinated liquid and CMOS *** to the absence of issues related to chip-material coupling,a high spatial resolution could be achieved by reducing the chip pixel *** method presents a new avenue for studies on novel liquid-based direct conversion X-ray detectors.

关键词： FC40 electronic fluorinated liquid CMOS pixel chip X-ray detector Spatial resolution

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Understanding and probing progression of localized corrosion on inner walls of steel pipelines:an overview

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Journal of Iron and Steel Research International 2025年第1期32卷 1-18页

作者： Ming-yu Wang Hai-yuan Yao yong-fei liu Ye-sen Zhu Wan-bin Chen Yun-ze Xu Yi Huang School of Naval Architecture and Ocean Engineering Dalian University of TechnologyDalian 116024LiaoningChina China National Offshore Oil Corporation Research Institute Co. Ltd.Beijing 100028China State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDalian University of TechnologyDalian 116024LiaoningChina

Corrosion poses a major threat to the safety of transportation ***,it is crucial to have an in-depth understanding of corrosion mechanisms in pipeline steels for the effective management of pipeline *** research on corrosion mechanisms relies on the use of efficient and reliable corrosion monitoring and analysis *** advancements in corrosion monitoring techniques specifically designed for the localized corrosion monitoring were aimed to be introduced,and a comprehensive overview of recent progress in understanding the localized corrosion mechanisms in pipeline steels was *** on the different corrosive environments encountered,the localized corrosion issues inside pipelines are classified into two categories:localized corrosion primarily influenced by electrochemical processes and localized corrosion controlled by both electrochemical and mechanical ***,a thorough analysis of the synergistic effects between micro-cell and macro-cell currents,as well as the interplay of mechanics and electrochemistry is ***,recommendations for future research on the mechanisms of internal localized corrosion in pipelines are provided.

关键词： Pipeline steel Localized corrosion Corrosion type Corrosion monitoring Corrosion mechanism

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阜阳市集中式地下水饮用水源地水化学特征及成因分析

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环境科学 2025年第2期46卷 796-808页

作者：苏贵芬刘桂建刘玥林深安徽省地质环境监测总站合肥230001 中国科学技术大学合肥230026 中国环境科学研究院北京100012 安徽省地勘局第一水文工程地质勘查院蚌埠233000

地下水是阜阳市重要饮用水源,其水化学特征关系到居民饮水健康安全.为研究阜阳地区集中式地下水饮用水源地的水化学特征及成因机制,采集了阜阳市地下饮用水源地地下水样84组,运用数理统计、Piper三线图、Gibbs图、相关性分析、离子比例... 详细信息

地下水是阜阳市重要饮用水源,其水化学特征关系到居民饮水健康安全.为研究阜阳地区集中式地下水饮用水源地的水化学特征及成因机制,采集了阜阳市地下饮用水源地地下水样84组,运用数理统计、Piper三线图、Gibbs图、相关性分析、离子比例系数和因子分析等方法,揭示了该区地下水水化学特征、水化学组分形成机制及控制因素.结果表明,阜阳市集中式地下水饮用水源地水体为中性偏碱性水、高矿化度水,水化学类型为HCO_(3)-Na型;地下水离子特征受“岩石风化”和“蒸发作用”双重影响,其中“岩石风化”更为明显,地下水离子组成会受到外因作用发生改变;地下水中Na^(+)-Cl^(-)、F^(-)-B^(3+)、Ca^(2+)-Mg^(2+)、SO_(4)^(2-)-Cl^(-)和Na^(+)-SO_(4)^(2-)离子来源相同,Ca^(2+)-Na^(+)、Ca^(2+)-HCO_(3)^(-)和Mg^(2+)-HCO_(3)^(-)的离子来源不同,Ca^(2+)-SO_(4)^(2-)呈弱相关,不能大量共存;地下水组分主要受到含水层岩石矿物溶滤作用、阳离子交替吸附作用,地下水中Ca^(2+)和Mg^(2+)主要来源于方解石的溶解,Na^(+)来源于钠长石等含钠矿物岩石的风化溶解,含钠矿物的Na^(+)与地下水中的Ca^(2+)和Mg^(2+)发生交换反应,使Na^(+)浓度增加并在地下水中富集,而Ca^(2+)和Mg^(2+)浓度降低;地下水超采、工农业生产以及生活污水等会对地下水质量造成影响.

关键词：集中式地下水饮用水源地水化学特征水化学形成作用成因机制控制因素

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Assessing the corrosion protection property of coatings loaded with corrosion inhibitors using the real-time atmospheric corrosion monitoring technique

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 119-126页

作者： Xiaoxue Wang Lulu Jin Jinke Wang Rongqiao Wang Xiuchun liu Kai Gao Jingli Sun yong Yuan Lingwei Ma Hongchang Qian Dawei Zhang School of Energy and Power Engineering Beihang UniversityBeijing 100191China Beijing Institute of Space Long March Vehicle Beijing 100076China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China Shanghai Spaceflight Precision Machinery Institute Shanghai 201600China

The atmospheric corrosion monitoring(ACM)technique has been widely employed to track the real-time corrosion behavior of metal ***,limited studies have applied ACM to the corrosion protection properties of organic *** study compared a bare epoxy coating with one containing zinc phosphate corrosion inhibitors,both applied on ACM sensors,to observe their corrosion protection properties over *** with artificial damage via scratches were exposed to immersion and alternating dry and wet environments,which allowed for monitoring galvanic corrosion currents in *** the corrosion tests,the ACM currents of the zinc phosphate/epoxy coating were considerably lower than those of the blank epoxy *** trend in ACM current variations closely matched the results obtained from regular electrochemical tests and surface *** alignment highlights the potential of the ACM technique in evaluating the corrosion protection capabilities of organic *** with the blank epoxy coating,the zinc phosphate/epoxy coating showed much-decreased ACM current values that confirmed the effective inhibition of zinc phosphate against steel corrosion beneath the damaged coating.

关键词： atmospheric corrosion monitoring technology corrosion inhibitor coating carbon steel corrosion protection

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Impacts of near-M_(s)austempering treatment on microstructure evolution and bainitic transformation kinetics of a medium Mn steel

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Journal of Iron and Steel Research International 2025年第1期32卷 249-259页

作者： yong-gang Yang Xin-yue liu Rui-zhi Li Yu-lai Chen Hong-xiang Wu Guo-min Sun Zhen-li Mi National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing 100083China Technology Center Ningbo Iron&Steel Co.Ltd.Ningbo 315800ZhejiangChina

The microstructure evolution and bainitic transformation of an Fe-0.19C-4.03Mn-1.48Si steel subjected to near-M_(s)austempering treatment were systematically investigated by combining dilatometer,X-ray diffraction,and electron *** additional austempering treatments with isothermal temperatures above M_(s)were used as *** show that the incubation period for the bainitic transformation occurs when the medium Mn steel is treated with the austempering temperature above M_(s).However,when subjected to near-M_(s)isothermal treatment,the medium Mn steel does not show an incubation period and has the fastest bainitic transformation ***,the largest volume fraction of bainite with a value of 74.7%is obtained on the condition of near-M_(s)austempering treatment after cooling to room *** and microstructure evolution analysis indicates that the elimination of the incubation period and the fastest rate of bainitic transformation are related to the preformed *** advent of preformed martensite allows the specimen to generate more bainite in a limited *** bainitic ferrite nucleation at austenite grain boundaries and through autocatalysis at ferrite/austenite interfaces,a model is established to understand the kinetics of bainite formation and it can describe the nucleation rate of bainitic transformation well when compared to the experimental results.

关键词： Medium manganese steel Bainitic transformation Microstructure Near-M_(s)austempering Transformation modeling

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Low-concentration atropine(0.01%)on quantitative contrast sensitivity function in Chinese children with myopia

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International Journal of Ophthalmology(English edition) 2025年第1期18卷 117-124页

作者： Yu-Hao Ye Yi-yong Xian Fang liu Zhong-Lin Lyu Xing-Tao Zhou Jing Zhao Department of Ophthalmology and Optometry Eye&ENT Hospital of Fudan UniversityShanghai 200031China NHC Key Laboratory of Myopia(Fudan University) Key Laboratory of MyopiaChinese Academy of Medical SciencesShanghai 200000China Shanghai Research Center of Ophthalmology and Optometry Shanghai 200000China Shanghai Engineering Research Center of Laser and Autostereoscopic 3D for Vision Care(20DZ2255000).Shanghai 200030 China Division of Arts and Sciences NYU ShanghaiShanghai 200000China Center for Neural Science and Department of Psychology New York UniversityNew York 10012USA NYU-ECNU Institute of Brain and Cognitive Science NYU ShanghaiShanghai 200000China

AIM:To investigate the effect of 0.01%low-concentration atropine(LA)on quantitative contrast sensitivity function(qCSF)in children with ***:This paired case-control study included 90 eyes of 58 children who were sex-,age-,and refractionmatched and equally divided into two groups:the 0.01%LA group had undergone 6mo use of daily 0.01%atropine and control group was naïve to *** ophthalmic examinations and qCSF test without refractive correction were *** groups were compared in monocular and binocular qCSF parameters,including the area under logCSF,CSF acuity,and contrast sensitivity(CS)at 1.0-18.0 cycle per degree(cpd).RESULTS:In the monocular comparison,the CSF acuity of the LA group was significantly higher than that of the control group(7.58±5.51 vs 6.37±4.22 cpd,P<0.05).The subgroup analysis showed that in the 6-9y group,CSF acuity was significantly higher in the LA group than the control group(8.76±6.19 vs 6.54±4.25 cpd,P<0.05),and in the Female group,low refraction sphere group,and high refraction cylinder group,the CS at high spatial frequencies(12.0 and 18.0 cpd)were significantly higher in the LA group than in the control group(all P<0.05).In the binocular test,CSF acuity and CS at 12.0 cpd were significantly higher in the LA group than in the control group(10.95±7.00 vs 8.65±5.12 cpd;0.17±0.33 vs 0.06±0.16,respectively;both P<0.05).CONCLUSION:Use of LA may result in improved CS in children with early onset myopia.

关键词： low-concentration atropine myopia quantitative contrast sensitivity function Chinese children

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Hierarchically Porous Polypyrrole Foams Contained Ordered Polypyrrole Nanowire Arrays for Multifunctional Electromagnetic Interference Shielding and Dynamic Infrared Stealth

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Nano-Micro Letters 2025年第4期17卷 399-418页

作者： Yu-long liu Ting-yu Zhu Qin Wang Zi-jie Huang De-xiang Sun Jing-hui Yang Xiao-dong Qi yong Wang School of Chemistry Key Laboratory of Advanced Technologies of Materials(Ministry of Education)Southwest Jiaotong UniversityChengdu 610031People’s Republic of China

As modern communication and detection technologies advance at a swift pace,multifunctional electromagnetic interference(EMI)shielding materials with active/positive infrared stealth,hydrophobicity,and electric-thermal conversion ability have received extensive *** the aforesaid requirements simultaneously remains a huge *** this research,the melamine foam(MF)/polypyrrole(PPy)nanowire arrays(MF@PPy)were fabricated via one-step electrochemical *** hierarchical MF@PPy foam was composed of three-dimensional PPy micro-skeleton and ordered PPy nanowire *** to the upwardly grown PPy nanowire arrays,the MF@PPy foam possessed good hydrophobicity ability with a water contact angle of 142.00°and outstanding stability under various harsh ***,the MF@PPy foam showed excellent thermal insulation property on account of the low thermal conductivity and elongated ligament characteristic of PPy nanowire ***,taking advantage of the high conductivity(128.2 S m^(-1)),the MF@PPy foam exhibited rapid Joule heating under 3 V,resulting in dynamic infrared stealth and thermal camouflage *** importantly,the MF@PPy foam exhibited remarkable EMI shielding effectiveness values of 55.77 dB and 19,928.57 dB cm^(2)g^(-1).Strong EMI shielding was put down to the hierarchically porous PPy structure,which offered outstanding impedance matching,conduction loss,and multiple *** innovative approach provides significant insights to the development of advanced multifunctional EMI shielding foams by constructing PPy nanowire arrays,showing great applications in both military and civilian fields.

关键词： Polypyrrole nanowire arrays Hierarchical foam Hydrophobicity Infrared stealth Electromagnetic interference shielding

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