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Journal of Materials science & Technology 2019年第6期35卷 1175-1183页

作者： cong Liu Wenyi Peng c.s. jiang Hongmin Guo Jun Tao Xiaohua Deng Zhaoxia chen school of Materials science and Engineering Nanchang University Nanchang 330031 China Institute of space science and Technology. Nanchang University Nanchang 330031 China

In this study, the effec.s.of composition and phase constitution on the mechanical properties and magnetic performance of AlcocuFeNix(x = 0.5, 0.8, 1.0, 1.5, 2.0, 3.0 in molar ratio) high entropy alloys(HEAs)were investigated. The results show that Ni element could lead to the evolution from face centered cubic(Fcc), body centered cubic(Bcc) and ordered Bcc coexisting phase structure to a single Fcc phase. The change of phase constitution enhanc.s.the plasticity but reduc.s.the hardness and strength. One of the interesting points is the excellent soft magnetic properties of AlcocuFeNixHEAs. soft magnetic performance is dependent on composition and phase transition. AlcocuFeNi1.5 alloy, achieving a better balance of mechanical and magnetic properties, could be applied as structure materials and soft magnetic materials(sMMs). High curie temperature(>900 K) and strong phase stability below 1350 K of AlcocuFeNi0.5 alloy confirm its practicability in a high-temperature environment. Atomic.s.ze difference(δ) is utilized as the critical parameter to explain the lattice strain and phase transformation induced by Ni addition.

关键词： High entropy alloy Phase transformation Mechanical property soft magnetic performance Atomic size difference

Hierarchical control strategy for Load Regulation Based on stackelberg Game Theory considering Randomness

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csEE Journal of Power and Energy systems 2024年第3期10卷 929-941页

作者： Tingyu jiang Ping Ju c.Y.chung Yuzhong Gong college of Energy and Electrical Engineering Hohai UniversityNanjing 211100China Department of Electrical Engineering City University of Hong KongHong Kong CF624China Department of Electrical and computer Engineering University of SaskatchewanSaskatoonSK S7N 5A9Canada csEE IEEE

Demand response has been recognized as a valuable functionality of power systems for mitigating power *** paper proposes a hierarchical control strategy among the distribution system operator(DsO),load aggregators(LAs),and thermostatically controlled loads(Tc.s.;the strategy includes a scheduling layer and an executive layer to provide load *** the scheduling layer,the DsO(leader)offers compensation price(cP)strategies,and the LAs(followers)respond to cP strategies with available regulation power(ARP)*** of the DsO and LAs are modeled according to their behaviors during the load regulation *** game is adopted to capture interactions among the players and leader and to obtain the optimal strategy for each participant to achieve ***,considering inevitable random factors in practice,e.g.,renewable generation and behavior of users,two different stochastic models based on sample average approximation(sAA)and parameter modification are formulated with improved scheduling *** the executive layer,distributed Tc.s.are triggered based on strategies determined in the scheduling layer.A self-triggering method that does not violate user privacy is presented,where Tc.s.receive external signals from the LA and independently determine whether to alter their operation *** simulations are performed on the modified IEEE-24 bus system to verify effectiveness of the proposed strategy.

关键词： Demand response hierarchical control load regulation self-triggering method stackelberg game

Data-Driven Learning control Algorithms for Unachievable Tracking Problems

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IEEE/cAA Journal of Automatica sinica 2024年第1期11卷 205-218页

作者： Zeyi Zhang Hao jiang Dong shen samer s.saab the school of Mathematics Renmin University of ChinaBeijing 100872China IEEE the school of Engineering Lebanese American UniversityByblos 2038Lebanon

For unachievable tracking problems, where the system output cannot prec.s.ly track a given reference, achieving the best possible approximation for the reference trajectory becomes the objective. This study aims to investigate solutions using the Ptype learning control scheme. Initially, we demonstrate the nec.s.ity of gradient information for achieving the best ***, we propose an input-output-driven learning gain design to handle the imprec.s. gradients of a class of uncertain systems. However, it is discovered that the desired performance may not be attainable when faced with incomplete *** address this issue, an extended iterative learning control scheme is introduced. In this scheme, the tracking errors are modified through output data sampling, which incorporates lowmemory footprints and offers flexibility in learning gain *** input sequence is shown to converge towards the desired input, resulting in an output that is closest to the given reference in the least square sense. Numerical simulations are provided to validate the theoretical findings.

关键词： Data-driven algorithms incomplete information iterative learning control gradient information unachievable problems

An improved initial rotor position estimation method using high-frequency pulsating voltage injection for PMsM

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Defence Technology（防务技术） 2024年第3期33卷 19-29页

作者： Yang jiang Ming cheng school of Electrical Engineering Southeast UniversityNanjing 210096China

High frequency pulsating voltage injection method is a good candidate for detecting the initial rotor position of permanent magnet synchronous ***,traditional methods require a large number of filters,which leads to the deterioration of system stability and dynamic *** order to solve these problems,a new signal demodulation method is proposed in this *** proposed new method can directly obtain the amplitude of high-frequency current,thus eliminating the use of filters,improving system stability and dynamic performance and saving the work of adjusting filter *** addition,a new magnetic polarity detection method is proposed,which is robust to current measurement ***,experiments verify the effectiveness of the method.

关键词： Initial position detection signal demodulation algorithm Magnetic polarity detection Filter elimination

snapshotPrune: A Novel Bitcoin-Based Protocol Toward Efficient Pruning and Fast Node Bootstrapping

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Tsinghua science and Technology 2024年第4期29卷 1037-1052页

作者： Pengfei Huang Xiaojun Ren Teng Huang Arthur sandor Voundi Koe Duncan s Wong Hai jiang Institute of Artificial Intelligence and Blockchain Guangzhou UniversityGuangzhou 510006China Institute of Artificial Intelligence and Blockchain Guangzhou UniversityGuangzhou 510006Chinaand also with Pazhou LabGuangzhou 510330China

Node synchronization is essential for the stability of the Bitcoin network. critics have raised doubts about the ability of a new node to quickly and efficiently synchronize with the Bitcoin network and alleviate the storage pressure from existing full nodes to stockpile new data. Basic pruning and other techniques have been explored to address these concerns but have been insufficient to reduce node synchronization delay and effectively suppress the growth of synchronized data. In this study, we propose snapshotPrune, a novel pruning and synchronization protocol that achieves fast node bootstrapping in the Bitcoin blockchain. Real Bitcoin historical data are leveraged to measure the synchronization time and monitor the network traffic during node bootstrapping. The protocol requires data downloads that are 99.70% less than Bitcoin core, 81% less than coinPrune, and 60% less than snapshotsave, thereby saving 97.23% of download time. Findings show that the proposed design enhanc.s.the storage efficiency and reduc.s.the node synchronization delay compared with existing techniques. We hypothesize that the efficiency of this protocol increases with the block height.

关键词： synchronization blockchain Unspent Transaction Output(UTXO)pruning snapshot fast bootstrapping

Advanc.s.in Triboelectric Nanogenerators for Blue Energy Harvesting and Marine Environmental Monitoring

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Engineering 2024年第2期33卷 204-224页

作者： Yang jiang Xi Liang Tao jiang Zhong Lin Wang c.s.center for Excellence in Nanoscience Beijing Key Laboratory of Micro–Nano Energy and SensorsBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China school of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Georgia Institute of Technology AtlantaGA 30332USA

Blue energy,which includes rainfall,tidal current,wave,and water-flow energy,is a promising renewable resource,although its exploitation is limited by current technologies and thus remains *** form of energy is mainly harvested by electromagnetic generators(EMGs),which generate electricity via Lorenz force-driven electron *** nano genera tors(TENGs)and TENG networks exhibit superiority over EMGs in low-frequency and high-entropy energy harvesting as a new approach for blue energy harvesting.A TENG produc.s.electrical outputs by adopting the mechanism of Maxwell’s displacement *** date,a series of research efforts have been made to optimize the structure and performance of TENGs for effective blue energy harvesting and marine environmental *** the great progress that has been achieved in the use of TENGs in this context so far,continuous exploration is required in energy conversion,device durability,power management,and environmental *** review reports on advanc.s.in TENGs for blue energy harvesting and marine environmental *** introduc.s.the theoretical foundations of TENGs and disc.s.es advanced TENG prototypes for blue energy harvesting,including TENG structures that function in freestanding and contact-separation *** enhancement strategies for TENGs intended for blue energy harvesting are also ***,marine environmental applications of TENGs based on blue energy harvesting are disc.s.ed.

关键词： Triboelectric nanogenerator TENG networks Blue energy Energy harvesting Ocean sensors

comparative analysis of DNA-sIP and magnetic-nanoparticle mediated isolation (MMI) on unraveling dimethoate degraders

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Frontiers of Environmental science & Engineering 2024年第1期18卷 59-69页

作者： Luning Lian Yi Xing Dayi Zhang Longfei jiang Mengke song Bo jiang school of Energy and Environmental Engineering University of Science&Technology BeijingBeijing 100083China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants University of Science&Technology BeijingBeijing 100083China National Environmental and Energy science and Technology International cooperation Base University of Science&Technology BeijingBeijing 100083China college of New Energy and Environment Jilin UniversityChangchun 130021China Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China college of Natural Resourc.s.and Environment South China Agricultural UniversityGuangzhou 510642China National Engineering Laboratory for site Remediation Technologies Beijing 100015China

Microorganisms are crucial in the bioremediation of organophosphorus pesticides. However, most functional microorganisms (> 99%) are yet to be cultivated. This study applied two cultivation-independent approaches, DNA-sIP and magnetic-nanoparticle mediated isolation (MMI), to identify the functional microorganisms in degrading dimethoate in agricultural soils. MMI identified five dimethoate degraders: Pseudomonas, Bacillus, Ramlibacter, Arthrobacter, and Rhodococc.s. whereas DNA-sIP identified three dimethoate degraders: Ramlibacter, Arthrobacter, and Rhodococc.s. Also, MMI showed higher resolution than DNA-sIP in identifying functional microorganisms. Two organic phosphohydrolase (OPH) genes: ophc2 and ophB, were involved in dimethoate metabolism, as revealed by DNA-sIP and MMI. The degradation produc.s.of dimethoate include omethoate, O,O,s-trimethyl thiophosphorothioate, N-methyl-2-sulfanylacetamide, O,O-diethyl s-hydrogen phosphorodithioate, O,O,O-trimethyl thiophosphate, O,O,s-trimethyl thiophosphorodithioate, and O,O,O-trimethyl phosphoric. This study emphasizes the feasibility of using sIP and MMI to explore the functional dimethoate degraders, expanding our knowledge of microbial resourc.s.with cultivation-independent approaches.

关键词： stable isotope probing(sIP) Magnetic-nanoparticle mediated isolation(MMI) Dimethoate Biodegradation cultivation-independent approach

Heat Transfer and Friction characteristics of Printed circuit Heat Exchangers with Different channel structures for s-cO_(2) Power system

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Journal of Thermal science 2024年第3期33卷 1132-1147页

作者： jiang Tao LI Mingjia Key Laboratory of Thermo-Fluid science and Engineering of Ministry of Education School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an710049China school of Mechanical Engineering Beijing Institute of TechnologyBeijing100081China

Printed circuit heat exchanger(PcHE)has been widely used in supercritical carbon dioxide(s-cO_(2))power systems because of its high heat transfer efficiency and good ***,due to the large variety of PcHE configurations,channel selection in practical applications lac.s.a ***,this paper disc.s.ed the heat transfer and friction characteristics and the synergy of three fields in the channel under the guidance of the field synergy principle for four typical PcHE ***,the comprehensive performance of four channels was ***,the heat transfer and friction factor correlations for s-cO_(2)in four channels were *** findings demonstrate that the synergy of velocity and pressure fields of the straight channel PcHE is better(β≈180°),so its resistance loss is relatively *** zigzag and sinusoidal wavy channels and the airfoil fins can reduce the angle a between the temperature gradient and velocity,thus enhancing the heat *** sinusoidal wavy channel can reduce flow resistance compared to the zigzag channel due to the rounded *** streamlined airfoil structure can guide the flow and reduce backflow,thus reducing resistance *** the range of Re studied in this paper,the maximum error of the proposed heat transfer and friction factor correlations of PcHE is 7.0%,which shows good fitting *** research in this paper can provide a reference for the selection and design of PcHE with different channel configurations.

关键词： printed circuit heat exchanger supercritical carbon dioxide typical channel structure field synergy analysis

不同材质共享缆绳对浮式风电场系泊响应的影响

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中国舰船研究 2024年第4期19卷 59-70页

作者：仲凡连宇顺郑金海陈文兴马刚 YIM solomon c.s. 河海大学海岸灾害及防护教育部重点实验室江苏南京210098 河海大学港口海岸与近海工程学院江苏南京210098 浙江理工大学纺织纤维材料与加工技术国家地方联合工程实验室浙江杭州310018 哈尔滨工程大学烟台研究院山东烟台264006 俄勒冈州立大学美国俄勒冈州科瓦利斯97331

[目的]旨在合理设计浮式风电场的共享系泊系统,探究不同材质共享缆绳对浮式风电场动力响应的影响。[方法]首先,对浮式风电场设计共享系泊和传统(无共享缆绳)系泊方案,比较两种系泊方案的动力响应和经济成本,验证设计方案的可行性。其次... 详细信息

[目的]旨在合理设计浮式风电场的共享系泊系统,探究不同材质共享缆绳对浮式风电场动力响应的影响。[方法]首先,对浮式风电场设计共享系泊和传统(无共享缆绳)系泊方案,比较两种系泊方案的动力响应和经济成本,验证设计方案的可行性。其次,探究两类共享系泊系统对浮式风电场系泊响应的影响。最后,分析环境载荷的施加方向和缆绳材质对共享缆绳平均张力的影响。[结果]采用不同材质共享系泊系统的浮式风电场,其叶片张力近乎相同;两类共享系泊系统对风机位移和系缆平均张力的影响存在差别。此外,环境载荷施加角度和系缆材质也对风机位移和共享缆绳受力产生影响。[结论]该研究可为系泊系统中共享缆绳选型提供参考。

关键词：共享系泊系统共享缆绳锚链高强聚乙烯缆绳海上浮式风电场

AFM probe for measuring~10^(−5)ultra-low friction coefficient:Design and application

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Friction 2024年第1期12卷 64-73页

作者： Yushan cHEN Liang jiang Linmao QIAN Tribology Research Institute State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China

superlubricity provides a novel approach to addressing friction and wear issues in mechanical ***,little is known regarding improving the atomic force microscope(AFM)friction coefficient measurement ***,this study established the theoretical formula for the AFM friction coefficient measurement and deduced the measurement ***,the formula was applied to the AFM probe with a rectangular cross-section *** measurement resolution is associated with the dimensional properties of the AFM probe,the mechanical properties of the cantilever material,the properties of the position-sensitive detector(PsD),and probably the anti-vibration performance of the *** is feasible to make the cantilever as short as possible and the tip as high as possible to improve the measurement *** AFM probe for measuring an ultra-low friction coefficient was designed and *** cantilever’s length,width,and thickness are 50,35,and 0.6μm,*** tip height is 23μ*** measurement resolution can reach 7.1×10^(−6) under the maximum normal ***,the AFM probe was applied to measure the superlubricity between graphene *** friction coefficient is 0.00139 under 853.08 *** work provides a promising method for measuring a~10^(−5) friction coefficient of superlubricity.

关键词： atomic force microscope(AFM) superlubricity friction coefficientμ probe