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Effects of carbon content on the microstructure and tensile properties of a low-density steel

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 391-401页

作者： Yongxuan Shang Mingyu Fan Shuyong Jiang Zhongwu Zhang key laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China state key laboratory of Metal Material for Marine equipment and Application Iron&Steel Research Institute of Ansteel Group CorporationAnshan 114009China

Carbon can change the phase components of low-density steels and influence the mechanical *** this study,a new method to control the carbon content and avoid the formation ofδ-ferrite by decarburization treatment was *** microstructural changes and mechanical characteristics with carbon content induced by decarburization were systematically ***-Jaoul(C-J)analysis was employed to examine the work hardening characteristics during the tensile *** decarburization by heat treatments,the carbon content within the austenite phase decreased,while Mn and Al were almost unchanged;this made the steel with full austenite transform into the austenite and ferrite dual ***,(Ti,V)C carbides existed in both matrix phase and the mole fraction almost the *** addition,the formation of other carbides *** loss induced a decrease in strength due to the weakening of the carbon solid *** the steel with the single austinite,the deformation mode of austenite was the dislocation planar glide,resulting in the formation of *** the dual-phase steel,the deformation occurred by the dislocation planar glide of austenite first,with the increase in strain,the cross slip of ferrite took place,forming dislocation cells in *** the late stage of deformation,the work hardening of austinite increased rapidly,while that of ferrite increased slightly.

关键词： low-density steels carbon content decarburization strengthening mechanisms work hardening behavior

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Epigenetics in the modern era of crop improvements

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Science China Life Sciences 2025年

作者： Yan Xue Xiaofeng Cao Xiangsong Chen Xian Deng Xingwang Deng Yong Ding Aiwu Dong Chengguo Duan Xiaofeng Fang Lei Gong Zhizhong Gong Xiaofeng Gu Chongsheng He Hang He Shengbo He Xinjian He Yan He Yuehui He Guifang Jia Danhua Jiang Jianjun Jiang Jinsheng Lai Zhaobo Lang Chenlong Li Qing Li Xingwang Li Bao Liu Bing Liu Xiao Luo Yijun Qi Weiqiang Qian Guodong Ren Qingxin Song Xianwei Song Zhixi Tian Jiawei Wang Yuan Wang Liang Wu Zhe Wu Rui Xia Jun Xiao Lin Xu Zhengyi Xu Wenhao Yan Hongchun Yang Jixian Zhai Yijing Zhang Yusheng Zhao Xuehua Zhong Daoxiu Zhou Ming Zhou Yue Zhou Bo Zhu Jiankang Zhu Qikun Liu College of Life Sciences Institute of Life Science and Green Development Hebei University Biotechnology Research Institute Chinese Academy of Agricultural Sciences College of Biology Hunan Key Laboratory of Plant Functional Genomics and Developmental Regulation Hunan Engineering and Technology Research Center of Hybrid Rapeseed Hunan University Institute of Advanced Agricultural Sciences School of Advanced Agricultural Sciences Peking University state key laboratory for Conservation and Utilization of Subtropical Agro-Bioresources Guangdong Laboratory for Lingnan Modern Agriculture South China Agricultural University National Institute of Biological Sciences key laboratory of Seed Innovation Institute of Genetics and Developmental Biology Chinese Academy of Sciences School of Advanced Agricultural Sciences Peking-Tsinghua Center for Life Sciences Peking University Synthetic and Functional Biomolecules Center Beijing National Laboratory for Molecular Sciences Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education College of Chemistry and Molecular Engineering Peking University key laboratory of Seed Innovation State Key Laboratory of Plant Genomics and National Center for Plant Gene Research Institute of Genetics and Developmental Biology Chinese Academy of Sciences state key laboratory of Wheat Improvement Peking University Institute of Advanced Agricultural Sciences Shandong Laboratory of Advanced Agricultural Sciences in Weifang state key laboratory of Crop Stress Adaptation and Improvement School of Life Sciences Henan University state key laboratory of Maize Bio-breeding National Maize Improvement Center Department of Plant Genetics and Breeding China Agricultural University Frontiers Science Center for Molecular design Breeding China Agricultural University Center for Crop Functional Genomics and Molecular Breeding China Agricultural University Sanya Institute of China Agricultural University Hainan Yazhou Bay Seed laboratory Institute of Advan

Epigenetic mechanisms are integral to plant growth, development, and adaptation to environmental stimuli. Over the past two decades,our comprehension of these complex regulatory processes has expanded remarkably, producing a substantial body of knowledge on both locus-specific mechanisms and genome-wide regulatory patterns. Studies initially grounded in the model plant Arabidopsis have been broadened to encompass a diverse array of crop species, revealing the multifaceted roles of epigenetics in physiological and agronomic traits. With recent technological advancements, epigenetic regulations at the single-cell level and at the large-scale population level are emerging as new focuses. This review offers an in-depth synthesis of the diverse epigenetic regulations, detailing the catalytic machinery and regulatory functions. It delves into the intricate interplay among various epigenetic elements and their collective influence on the modulation of crop traits. Furthermore, it examines recent breakthroughs in technologies for epigenetic modifications and their integration into strategies for crop improvement. The review underscores the transformative potential of epigenetic strategies in bolstering crop performance, advocating for the development of efficient tools to fully exploit the agricultural benefits of epigenetic insights.

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An electromagnetic semi-active dynamic vibration absorber for thin-walled workpiece vibration suppression in mirror milling

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Applied Mathematics and Mechanics(English Edition) 2024年第8期45卷 1315-1334页

作者： Jianghua KONG Bei DING Wei WANG Zhixia WANG Juliang XIAO Hongyun QIU School of Mechanical Engineering Tianjin UniversityTianjin 300350China Tianjin key laboratory of Nonlinear Dynamics and Control Tianjin 300350China key laboratory of modern mechanisms and equipment design of the state ministry of education Tianjin UniversityTianjin 300350China

As critical components of aircraft skins and rocket fuel storage tank shells,large thin-walled workpieces are susceptible to vibration and deformation during machining due to their weak local *** address these challenges,we propose a novel tunable electromagnetic semi-active dynamic vibration absorber(ESADVA),which integrates with a magnetic suction follower to form a followed ESADVA(follow-ESADVA)for mirror *** system combines a tunable magnet oscillator with a follower,enabling real-time vibration absorption and condition feedback throughout the milling ***,the device supports self-sensing and frequency adjustment by providing feedback to a linear actuator,which alters the distance between *** resolves the traditional issue of being unable to directly monitor vibration at the machining point due to space constraints and tool *** frequency shift characteristics and vibration absorption performance are comprehensively *** and experimental results demonstrate that the prototyped follow-ESADVA achieves frequency synchronization with the milling tool,resulting in a vibration suppression rate of approximately 47.57%.Moreover,the roughness of the machined surface decreases by18.95%,significantly enhancing the surface *** results of this work pave the way for higher-quality machined surfaces and a more stable mirror milling process.

关键词： semi-active dynamic vibration absorber(SADVA) mirror milling selfsensing vibration absorption tuning thin-walled workpiece

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Research on embedded locally resonant metamaterials used for vibration attenuation of thin-walled workpieces in mirror milling

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Acta Mechanica Sinica 2024年第8期40卷 1-16页

作者： Bei Ding Wei Wang Juliang Xiao Zhiqiang Wu Cheng Liu School of Mechanical Engineering Tianjin UniversityTianjin300350China Tianjin key laboratory of Nonlinear Dynamics and Control Tianjin300350China key laboratory of modern mechanisms and equipment design of the state ministry of education Tianjin UniversityTianjin300350China

The shell composed of large-scale parts is the essential component of mechanical structures in the aerospace,shipping,and railway *** workpieces are characterized by thin walls and weak rigidity,thus requiring an effective technology for high-performance ***,an embedded locally resonant metamaterial with double resonators is proposed and combined with the magnetic follow-up support technology to attenuate the vibration of thin-walled parts for the first *** band structures and parametric adjustment laws are systematically investigated and validated by analytical calculation and finite element method,which proves the proposed model is broadband,lightweight,and flexible in low *** characteristics,as well as the relatively simple structure,are unique advantages for thin-walled structure ***,mirror milling experiments have been performed to assess the slave module with the proposed *** the results,the root mean square amplitude of the thin-walled workpiece with the combined device decreases by nearly 9%,which means that the performance has been improved by the combined ***,this work provides an integrated and efficient solution for vibration suppression in thin-walled parts milling,which extends locally resonant metamaterials to practical engineering fields and helps to improve the status quo of mirror milling from the perspective of metamaterials.

关键词： Local resonance Band gap Thin-walled workpieces Vibration suppression

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Differences in breaking behavior of rice leaves under microwave and naturally drying processes

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International Journal of Agricultural and Biological Engineering 2022年第1期15卷 89-100,F0002页

作者： Meilin Wang Zhong Tang Ben Zhang Yu Li key laboratory of modern Agricultural equipment and Technology Ministry of EducationJiangsu UniversityZhenjiang 212013JiangsuChina

In order to fight for good farming time or harvest in bad weather,combine harvester will produce more broken leaves when threshing high moisture content rice,which will seriously hinder the grain cleaning *** this study,the breaking behavior of rice leaves under different microwave drying time and drying power was ***,based on the appearance of freshly rice leaves undergoing microwave drying,the changing property of moisture content,weightlessness rate and temperature rise of rice leaves were tested and ***,the tensile breaking force of freshly rice leaves under different microwave drying time and drying power was tested and compared with the tensile breaking force of naturally dried ***,the optimal microwaves parameters of rice leaves after drying which could result in greater breaking force than the natural drying state were *** result showed that microwave drying method will reduce the moisture content of rice leaves and change the microstructure,which would affect the tensile-breaking property of rice *** maximum tensile breaking force of rice leaves appeared at microwave dried power 70 W for 5-8 min and at microwave dried power 210 W for 3-4 *** tensile breaking property of rice leaves at microwave dried power 350 W for 6-8 min were the weakest,which was lower than that of fresh rice ***,the optimal microwave drying parameters of rice leaves will provide a basis for the application of microwave technology in the threshing process.

关键词： rice harvesting rice leaves microwave drying moisture content breaking force

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Effects of multi-sequence combination forces on creep characteristics of bales during wheat harvesting

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International Journal of Agricultural and Biological Engineering 2021年第5期14卷 88-99页

作者： Zhong Tang Yaquan Liang Ben Zhang Meiling Wang Hao Zhang Yaoming Li key laboratory of modern Agricultural equipment and Technology of ministry of education Jiangsu UniversityZhenjiang 212013JiangsuChina

During the baling operation,the wheat stalks are subjected to various mechanisms in the baler and the main form is *** the wheat stem is forced by a combination of the threshing cylinder,it needs to be formed under the action of straw baler and meet transport *** paper mainly studies the properties of wheat stalks when baling,and proposes the application of the creep after-effect theory during the baling *** tension-compression tester was used to perform a 50 mm stalk mechanical test,50 mm stalk static pressure test,35 mm×40 mm×50 mm stalk module static pressure test and bale static pressure *** measured elastic modulus of the stem sample was 7.59 MPa,and the elastic modulus of the inner core of the stem was 8.24 *** return curve of the single stalk and the bale is consistent with the initial creep and steady-state creep in the creep after-effect theory.A logarithmic function was used for fitting of the first stage with coefficient of determination R2=0.8364,and a linear function was used for fitting of the second stage with coefficient of determination R2=*** high water content static pressure test suggests that the load in the loading direction is the coupled load of the working load of the hydraulic cylinder and the internal stress of the *** harvesting wheat stalks with high moisture content,the density parameter of the bale can be appropriately increased while the load parameter of the hydraulic cylinder can be considered unchanged or even *** adjustment of density and load can still ensure the forming quality of the bale.

关键词： baler rheological properties wheat stalk mechanical properties

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Effects of low nutrition on photosynthetic capacity and accumulation of total N and P in three climber plant species

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Chinese Journal Of Geochemistry 2015年第1期34卷 115-122页

作者： Deke Xing Yanyou Wu key laboratory of modern Agricultural equipment and Technology Ministry of Education & Jiangsu Province Institute of Agricultural Engineering Jiangsu University state key laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences

To study the effects of low nutrition on pho tosynthetic capacity and accumulation of total nitrogen(N) and phosphorus(P) in three climber plant species Pharbitis nil(Linn.) Choisy, Lonicera japonica Thunb. and Parthenocissus tricuspidata(*** Zucc.) Planch, al climber plants were exposed to low nutrition at 6 levels(Hoagland solution as control, 1/2, 1/4, 1/8, 1/16 and 1/32 strength Hoagland solution) for 30 days. Photosynthetic capacity was determined by measuring leaf chlorophyl fluorescence, chlorophyll content, carbonic anhydrases activity and growth. Accumulation of total N and P was studied by measuring N and P content in plant tissues. Low nutrition decreased the photosynthetic capacity of P. nil while L. japonica maintained high photosynthetic capacity under low nutrition. Photosynthetic apparatus of P. tricu spidata suffered no damage when exposed to low nutrition L. japonica and P. tricuspidata had better adaptability to low nutrition than P. nil. With a faster growth rate, P. ni consumed more nutrition(N and P), and its growth was mainly affected by P deficiency under low nutrition Although L. japonica suffered damage from N and P deficiency simultaneously, but the nutrient deficiency was not serious except for 1/32-strength Hoagland solution P. tricuspidata grew slowly, so its requirement of N and Pwere the least, even if it was mainly affected by the P deficiency, it could still grow well under low *** the consideration of fertilizing N and P fertilizers in karst areas which were with lower N and P contents, plant species, N/P ratio threshold and low nutrition level should be taken into account synchronously. This study could provide a general consideration for the planning and developing low nutrition resistant plants and fertilizing the three climber plant species in the low nutrition environment.

关键词：光合能力植物物种营养液总氮登山积累叶绿素荧光叶绿素含量

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Ultrasonic power features of wire bonding and thermosonic flip chip bonding in microelectronics packaging

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Journal of Central South University of Technology 2008年第5期15卷 684-688页

作者：李军辉韩雷钟掘 School of Mechanical and Electronical Engineering Central South University key laboratory of modern Complex equipment design and Extreme Manufacturing of ministry of education Changsha 410083 China state key laboratory of Digital Manufacturing equipment and Technology Huazhong University Science and Technology Wuhan 430074 China

The driving voltage and current signals of piezoceramic transducer (PZT) were measured directly by designing circuits from ultrasonic generator and using a data acquisition software system. The input impedance and power of PZT were investigated by using root mean square (RMS) calculation. The vibration driven by high frequency was tested by laser Doppler vibrometer (PSV-400-M2). And the thermosonic bonding features were observed by scanning electron microscope (JSM-6360LV). The results show that the input power of bonding is lower than that of no load. The input impedance of bonding is greater than that of no load. Nonlinear phase, plastic flow and expansion period, and strengthening bonding process are shown in the impedance and power curves. The ultrasonic power is in direct proportion to the vibration displacement driven by the power, and greater displacements driven by high power (>5 W) result in welding failure phenomena, such as crack, break, and peeling off in wedge bonding. For thermosonic flip chip bonding, the high power decreases position precision of bonding or results in slippage and rotation phenomena of bumps. To improve reliability and precision of thermosonic bonding, the low ultrasonic power (about 1-5 W) should be chosen.

关键词： ultrasonic power wedge bonding thermosonic flip chip input impedance failure

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Event-based triggering mechanisms for nonlinear control systems

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Science China(Information Sciences) 2020年第5期63卷 119-130页

作者： Yongfeng GAO Ximing SUN Xian DU Wei WANG key laboratory of Intelligent Control and Optimization for Industrial equipment of ministry of education Dalian University of Technology

This study examines triggered implementations of stabilizing controllers for general nonlinear systems. By using perturbation theory and Taylor's theorem, we propose new event-triggering and selftriggering mechanisms for general nonlinear control systems that are not necessarily input-to-state stable with respect to measurement errors. Both mechanisms are presented based on mild conditions and can ensure the uniform ultimate boundedness of the solutions of the resulting closed-loop control systems. The ultimate bounds can be made arbitrarily small by adjusting the design parameters. The effectiveness of the theoretical results is illustrated by simulations.

关键词： nonlinear systems triggered control sampled-data

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Measured Impedance and Threshold Value of Electrode Line Impedance Supervision Based Protection in HVDC Transmission System

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Journal of modern Power Systems and Clean Energy 2023年第4期11卷 1294-1304页

作者： Qiang Sun Bin Li Jiawei He Ye Li key laboratory of Smart Grid of ministry of education Tianjin UniversityTianjinChina state key laboratory of Reliability and Intelligence of Electrical equipment Hebei University of TechnologyTianjinChina

At present,electrode line impedance supervision(ELIS)based protection is widely used to detect faults on grounding electrode lines,which are indispensable elements of high-voltage direct current(HVDC)*** existing theoretical analysis of measured impedance is based on lumped line model and the threshold value is generally set according to engineering experience,which have caused the dead zone problem and even ***,a study on measured impedance of ELIS-based protection and its threshold value selection method is carried out to solve this *** this study,the expressions of measured impedance under normal operation and fault conditions are deduced based on rigorous and accurate line *** on the expressions,the characteristics of the measured impedance are calculated and *** the characteristics of the measured impedance,the applicability of the protection with the traditional threshold value is further discussed and the distribution of the dead zone can be ***,the method to calculate the threshold value of ELIS-based protection is *** a proper threshold value selected by the proposed method,the dead zone of ELIS-based protection is effectively eliminated,and the protection can identify all types of faults even with large transition *** studies on PSCAD/EMTDC have been conducted to verify the conclusion.

关键词： Grounding electrode line electrode line impedance supervision(ELIS)based protection measured impedance characteristic threshold value selection

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