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A new deformable cable for rock support in high stress tunnel:Steel pipe shrinkable energy-absorbing cable

International Journal of Mining Science and Technology 2024年第8期34卷 1083-1093页

作者： Xuezhen wu Mingzhu zhao Qing Ye Yujing Jiang Tao Deng Hanfang Zheng Gang Wang Zhenchang Guan College of Civil engineering Fuzhou UniversityFuzhou 350108China school of engineering Nagasaki UniversityNagasaki 852-8521Japan Key Laboratory of Underground engineering Fujian University of TechnologyFuzhou 350118China

High stress in surrounding rock will lead to serious problems,e.g.,rock burst in hard rock and large deformation in soft *** applied support system under high in-situ stress conditions should be able to carry high load and also accommodate large deformation without experiencing severe *** this paper,a specially designed energy-absorbing component for rock bolt and cable that can solve the above problems was *** energy-absorbing component can provide support resistance by plastic deformation of the metal including constraint annulus and compression *** practical engineering,two forms were *** was installed in the surrounding rock by reaming,and the other was installed directly outside the surrounding *** the dilation of the surrounding rock,the relative displacement of constraint annulus and compression pipe occurs,resulting in deformation *** resistance is transmitted to the rock bolt or cable,providing support *** lab test and numerical simulation showed that the energy-absorbing component can perfectly achieve the large deformation effect,the deformation amount is as high as 694 mm,and the bearing capacity is stable at 367 *** field application tests were carried out in the mining roadway of Xinjulong coal mine,and the results showed that the new type of cable can ensure itself not to break under the condition of large deformation of the surrounding *** energy-absorbing component has the superiorities of performing large constant resistance and controllable deformation to effectively control the unpredictable disasters such as large deformation in soft rock and rock burst in hard rock encountered in deep strata.

关键词： Energy-absorbing cable Numerical simulation Lab test Load capacity Ultimate displacement

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SnO_(2)/metal organic complex composite derived from low-temperature activated metal organic complex for advanced lithium storage

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Rare Metals 2024年第7期43卷 3032-3043页

作者： Gui-Long Liu Zi-Han zhao Jin-Ke Shen Zi-Bo zhao Nai-Teng wu Dong-Lei Guo Wei-Wei Yuan Yong Liu Ye-Hua Su Xian-Ming Liu Luoyang Key Laboratory of Green Energy Materials College of Chemistry and Chemical EngineeringLuoyang Normal UniversityLuoyang 471934China school of Materials Science and engineering Henan University of Science and TechnologyLuoyang 471023China Inner Mongolia Shijie Chemical Co. Ltd.Alxa League 737300

Sn-based metal organic complexes with coordination bonds,multi-active sites,and high theoretical capacity have attracted much attention as promising anodes for lithium ion ***,the low electrical conductivity and huge volume changes restricted their electrochemical stability and practical ***,Snbased anode with superior electrochemical performance,including a high reversible capacity of 1050.1 mAh·g^(-1)at 2 A·g^(-1)and a stable capacity of 1105.5 mAh·g^(-1)after 500 cycles at 1 A·g^(-1),was fabricated via a low-temperature calcination strategy from Sn metal organic *** low-temperature calcination process regulates Sn-O bond and prevents the agglomeration of SnO_(2),generating highly dispersed SnO_(2) decorated metal organic complexes and providing sufficient active sites for ion *** situ characterizations expound that the undecomposed Sn-based metal organic complexes could be transformed into SnO_(2) during lithiation and delithiation,which enhances the electrical conductivity and induces a strong pseudo-capacitive behavior,accelerating the electrochemical kinetics;the multiple solid electrolyte interface with inflexible LiF and flexible ROCO_(2)Li buffers the volume variation of the electrode,resulting in its high electrochemical *** work provides a simple strategy for preparing excellent Sn-based anodes from metal organic complexes and reveals the lithium storage mechanism of the prepared Snbased anode.

关键词： Metal organic complex Lithium ion battery Electrochemical activation Low-temperature activation Partial decomposition

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Data-driven Predictive Voltage Control for Distributed Energy Storage in Active Distribution Networks

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CSEE Journal of Power and Energy Systems 2024年第5期10卷 1876-1886页

作者： Yanda Huo Peng Li Haoran Ji Hao Yu Jinli zhao Wei Xi Jianzhong wu Chengshan Wang school of Electrical and Information engineering Tianjin UniversityTianjin 300072China Digital Power Grid Research Institute China Southern Power GridGuangzhou 510630China school of engineering Cardiff UniversityCardiff CF243AAU.K.

Integration of distributed energy storage(DES)is beneficial for mitigating voltage fluctuations in highly distributed generator(DG)-penetrated active distribution networks(ADNs).Based on an accurate physical model of ADN,conventional model-based methods can realize optimal control of ***,absence of network parameters and complex operational states of ADN poses challenges to model-based *** paper proposes a data-driven predictive voltage control method for ***,considering time-series constraints,a data-driven predictive control model is formulated for DES by using measurement ***,a data-driven coordination method is proposed for DES and DGs in each *** boundary information interaction,voltage mitigation effects can be improved by interarea coordination ***,control performance is tested on a modified IEEE 33-node test *** studies demonstrate that by fully utilizing multi-source data,the proposed predictive control method can effectively regulate DES and DGs to mitigate voltage violations.

关键词： Distribution network distributed energy storage(DES) distributed generators(DGs) data-driven predictive voltage control

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Anomalous{1012}tensile twinning and subsequent detwinning in a friction stir processed carbon fiber-reinforced Mg composite

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Journal of Magnesium and Alloys 2024年第4期12卷 1511-1517页

作者： Wei zhao Zhihao Jiang Xiang wu Yujing Liu Haokun Yang Jun Wang Qi Liu Xiaochun Liu Institute of Metals College of Materials Science and EngineeringChangsha University of Science&TechnologyChangsha 410114China Department of mechanical engineering City University of Hong KongHong KongChina Smart manufacturing division Hong Kong Productivity CouncilHong Kong SAR 999077China Institute for Frontier Materials Deakin UniversityGeelongVIC 3216Australia Department of Industrial and Systems engineering The Hong Kong Polytechnic UniversityHong KongChina

*** text Owing to their low density and high specific strength,magnesium alloys and magnesium-based composites have great potential as structure metal materials in applications where lightweight matters[1–4].Deformation twins[5],especially the{1012}tension twins(also called tensile or extension twins)with a low critical resolved shear stress(CRSS)[6],are commonly observed in Mg *** can provide the much-needed deformation along the c-axis in their hcp structure resulting from the very few easily activated slip systems in this crystal structure[7].The tensile twinning activation usually follows the macroscopic Schmid factor law[2],i.e.,the twin variant with the highest Schmid factor occurs,and it only appears when its Schmid factor is positive.

关键词： friction deformation magnesium

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Privacy-Preserving Multi-Keyword Fuzzy Adjacency Search Strategy for Encrypted Graph in Cloud Environment

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Computers, Materials & Continua 2024年第3期78卷 3177-3194页

作者： Bin wu Xianyi Chen Jinzhou Huang Caicai Zhang Jing Wang Jing Yu Zhiqiang zhao Zhuolin Mei school of Computer and Big Data Science Jiujiang UniversityJiujiang332005China Jiujiang Key Laboratory of Network and Information Security Jiujiang332005China school of Computer and Software Nanjing University of Information Science&TechnologyNanjing210044China school of Computer engineering Hubei University of Arts and ScienceXiangyang441053China school of Modern Information Technology Zhejiang Institute of Mechanical and Electrical EngineeringHangzhou310053China Information Center Jiangxi Changjiang Chemical Co.Ltd.Jiujiang332005China school of Mathematics and Computer Science Ningxia Normal UniversityGuyuan756099China

In a cloud environment,outsourced graph data is widely used in companies,enterprises,medical institutions,and so *** owners and users can save costs and improve efficiency by storing large amounts of graph data on cloud *** on cloud platforms usually have some subjective or objective attacks,which make the outsourced graph data in an insecure *** issue of privacy data protection has become an important obstacle to data sharing and *** to query outsourcing graph data safely and effectively has become the focus of *** query is a basic and frequently used operation in graph,and it will effectively promote the query range and query ability if multi-keyword fuzzy search can be supported at the same *** work proposes to protect the privacy information of outsourcing graph data by encryption,mainly studies the problem of multi-keyword fuzzy adjacency query,and puts forward a *** our scheme,we use the Bloom filter and encryption mechanism to build a secure index and query token,and adjacency queries are implemented through indexes and query tokens on the cloud *** proposed scheme is proved by formal analysis,and the performance and effectiveness of the scheme are illustrated by experimental *** research results of this work will provide solid theoretical and technical support for the further popularization and application of encrypted graph data processing technology.

关键词： Privacy-preserving adjacency query multi-keyword fuzzy search encrypted graph

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Controlling Three-Step and Five-Step Spin Transitions by Polymorphism in an Fe^(Ⅲ) Spin Crossover Complex

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Chinese Journal of Chemistry 2024年第8期42卷 879-886页

作者： Yingying wu Shuang Peng Ziyi Zhang Yue Gao Guangyan Xu Jingwei Dai zhao-Yang Li Masahiro Yamashita school of Materials Science and engineering Nankai University38 Tongyan RoadHaihe Educational ParkTianjin300350 China State Key Laboratory of Medicinal Chemical Biology Nankai UniversityTianjin300071 China Department of Chemistry Graduate School of ScienceTohoku UniversitySendai980-8578 Japan

Comprehensive Summary,Regulating spin crossover(SCO)behavior,especially controlling the spin transition steps,is an important scientific issue,mainly because people aim to control spin bistability and ***,SCO bistability can be regulated by changing the ligand-modifying species,non-coordinated anions,guest molecules,and metal-ion ***,the control of multistability is extremely challenging,especially in Fe(III)SCO ***,we report that[FeIII(H-5-Br-thsa)(5-Br-thsa)]·H2O(5-Br-thsa=(5-bromo-2-hydroxybenzylidene)hydrazinecarbothioamide),a compound we have reported before,exists in two polymorphic forms:polymorph 1 exhibits three-step SCO,and polymorph 2 shows five-step SCO,with multi-step SCO behavior effectively regulated by *** to single-crystal and powder X-ray diffractometry,polymorphs 1 and 2 crystallize in different space groups during their spin transitions,with two-step symmetry breaking observed(Pbcn→Pnc2→Pbcn for polymorph 1;P21/n→Pn→P21/n for polymorph 2).We realized that the behavior of these two polymorphs depends significantly on the structure,including(i)the average Fe—N bond distance,(ii)deformation of octahedral FeIII atoms,and(iii)distinct crystal packing,which account for the large differences observed in magnetic properties.

关键词： Spin crossover Multi-step spin transition Symmetry breaking Polymorphism Magnetic property

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Effects of synthetic site water on bentonite-concrete system for a potential nuclear waste repository

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Journal of Rock Mechanics and Geotechnical engineering 2024年第9期16卷 3786-3797页

作者： zhao Sun Yong-Gui Chen Wei-Min Ye Qiong Wang Dong-Bei wu Zhen-Yu Yin Key Laboratory of Geotechnical and Underground engineering of Ministry of Education Department of Geotechnical EngineeringTongji UniversityShanghai200092China Department of Civil and Environmental engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina school of Chemical Science and engineering Tongji UniversityShanghai200092China

In high-level nuclear waste(HLW)repositories,concrete and compacted bentonite are designed to be employed as buffer materials,which may raise a problem of interactions between concrete and *** interactions would lead to mineralogy transformation and buffer performance decay of bentonite under the near field environment conditions in a repository.A small-scale experimental setup was established to simulate the concrete-bentonite-site water interaction system from a potential nuclear waste repository in *** types of mortars were prepared to correspond to the concrete at different degradation *** results permit the determination of the following:(1)The macroproperties of Gaomiaozi(GMZ)bentonite(*** pressure,permeability,the final dry density,and water content of reacted samples);(2)The composition evolution of fluids from the synthetic site water-concrete-bentonite interaction systems;(3)The sample characterization including Fourier transform infrared spectroscopy(FTIR)and X-ray powder diffraction(XRD).Under the infiltration of the synthesis Beishan site water(BSW),the swelling pressure of bentonite decreases slowly with time after reaching its second swelling *** flux decreases with time during the infiltrations,and it tends to be stable after more than 120 *** to the cation exchange reactions in the BSW-concrete-bentonite systems,the divalent cations(Ca and Mg)were consumed,and the monovalent cations(Na and K)were *** dissolution of minerals in the bentonite such as albite causes Si increasing in the pore *** was concluded that the hydro-mechanical property degradation of bentonite takes place when it comes into contact with concrete mortar,even under low-pH groundwater *** soil dispersion,the uneven water content,and the uneven dry density in bentonite samples may partly contribute to the swelling decay of ***,the direct contact with concrete has an obvious effect on the performance

关键词： Mock-up device GMZ bentonite Site water-concrete-bentonite system Geochemistry Buffer performance

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Thermoacoustic heat pump utilizing medium/low-grade heat sources for domestic building heating

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Energy and Built Environment 2024年第4期5卷 628-639页

作者： Yiwei Hu Kaiqi Luo Dan zhao Zhanghua wu Yupeng Yang Ercang Luo Jingyuan Xu Chinese Academy of Science Key Laboratory of CryogenicsTechnical Institute of Physics and ChemistryBeijing 100190China University of Chinese Academy Science Beijing 100049China Building Energy Research Center Tsinghua UniversityBeijing 100084China Department of mechanical engineering Faculty of EngineeringUniversity of CanterburyPrivate Bag 4800Christchurch 8041New Zealand Institute of Microstructure Technology Karlsruhe Institute of TechnologyKarlsruhe 76344Germany

Thermoacoustic heat pumps are a promising heating technology that utilizes medium/low-grade heat to reduce reliance on *** study proposes a single direct-coupled configuration for a thermoacoustic heat pump,aimed at minimizing system complexity and making it suitable for domestic *** investiga-tions were conducted under typical household heating conditions,including performance analysis,exergy loss evaluation,and axial distribution of key *** show that the proposed thermoacoustic heat pump achieves a heating capacity of 5.7 kW and a coefficient of performance of 1.4,with a heating temperature of 300℃and a heat-sink temperature of 55℃.A comparison with existing absorption heat pumps reveals favor-able adaptability for large temperature lift applications.A case study conducted in Finland over an annual cycle analyzes the economic and environmental performance of the system,identifying two distinct modes based on the driving heat source:medium temperature(≥250℃)and low temperature(<250℃),both of which exhibit favorable heating *** the thermoacoustic heat pump is driven by waste heat,energy savings of 20.1 MWh/year,emission reductions of 4143 kgCO_(2)/year,and total environmental cost savings of 1629€/year are *** results demonstrate the potential of the proposed thermoacoustic heat pump as a cost-effective and environmentally friendly option for domestic building heating using medium/low-grade heat sources.

关键词： Thermoacoustic heat pump Thermodynamics Heat pump Medium/low-grade heat Domestic heating

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Numerical Simulation-Based Analysis of the Impact of Overloading on Segmentally Assembled Bridges

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Structural Durability & Health Monitoring 2024年第5期18卷 663-681页

作者： Donghui Ma Wenqi wu Yuan Li Lun zhao Yingchun Cai Pan Guo Shaolin Yang Shanghai Urban Construction and Maintenance Management Co. Ltd.Shanghai200023China school of Water Conservancy and Transportation Zhengzhou UniversityZhengzhou450001China

Segmentally assembled bridges are increasinglyﬁnding engineering applications in recent years due to their unique advantages,especially as urban *** loads are one of the most important variable loads acting on bridge ***,the inﬂuence of overloaded vehicles on existing assembled bridge structures is an urgent concern at *** paper establishes theﬁnite element model of the segmentally assembled bridge based on ABAQUS software and analyzes the inﬂuence of vehicle overload on an assembled girder bridge ***,aﬁnite element model corresponding to the target bridge is established based on ABAQUS software,and the load is controlled to simulate vehicle movement in each area of the traveling zone at different ***-ond,the key cross-sections of segmental girder bridges are monitored in real time based on the force character-istics of continuous girder bridges,and they are compared with the simulation ***,a material damage ontology model is introduced,and the structural damage caused by different overloading rates is compared and *** show that theﬁnite element modeling method is accurate by comparing with on-site measured data,and it is suitable for the numerical simulation of segmental girder bridges;Dynamic sensors installed at 1/4L,1/2L,and 3/4L of the segmental girder main beams could be used to identify the dynamic response of segmental girder bridges;The bottom plate of the segmental girder bridge is mostly damaged at the position where the length of the precast beam section changes and the midspan *** the increase in load,damage in the direction of the bridge develops faster than that in the direction of the transverse ***ﬁndings of this study can guide maintenance departments in the management and maintenance of bridges and vehicles.

关键词： Segmentally assembled bridge dynamic response moving loads overloading structural damage ﬁnite element analysis

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Partitioning Calculation Method of Short-Circuit Current for High Proportion DG Access to Distribution Network

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Energy engineering 2024年第9期121卷 2569-2584页

作者： Wei Wang Qingzhu Shao Shaoliang Wang Yiwei zhao Yuanbo Ye Duanchao Li Mengyu wu Anhui Electric Power Dispatch and Control Center State Grid Anhui Electric Power Co.Ltd.Hefei230000China school of Electrical engineering Beijing Jiaotong UniversityBeijing100000China

Aiming at the problemthat the traditional short-circuit current calculationmethod is not applicable to Distributed Generation(DG)accessing the distribution network,the paper proposes a short-circuit current partitioning calculation method considering the degree of voltage drop at the grid-connected point of ***,the output characteristics of DG in the process of low voltage ride through are analyzed,and the equivalent output model of DG in the fault state is ***,by studying the network voltage distribution law after fault in distribution networks under different DG penetration rates,the degree of voltage drop at the grid-connected point of DG is used as a partition index to partition the distribution ***,iterative computation is performed within each partition,and data are transferred between partitions through split nodes to realize the fast partition calculation of short-circuit current for high proportion DG access to distribution network,which solves the problems of long iteration time and large calculation error of traditional short-circuit ***,a 62-node real distribution network model containing a high proportion of DG access is constructed onMATLAB/Simulink,and the simulation verifies the effectiveness of the short-circuit current partitioning calculation method proposed in the paper,and its calculation speed is improved by 48.35%compared with the global iteration method.

关键词： High proportion DG short-circuit calculation low voltage ride through partition iteration

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