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Lead-free(Ba,Sr)TiO_(3)-based ceramics with superior tunable properties by the semi-solution method

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Journal of Advanced Ceramics 2024年第6期13卷 746-756页

作者： Yi Zhao Wenfeng Liu Dongsheng Ran Yihang Jin Zhiyuan Li Chengzhi Zhong Fanyi Kong Shengtao Li State Key Laboratory of Electrical Insulation and power Equipment Xi’an Jiaotong UniversityXi’an 710049China Jiaxing Electric power co.pany State Grid Zhejiang Electric power co. Ltd.Jiaxing 314000China

High-performance dielectric tunable materials with both high dielectric tunability and low dielectric loss are urgently needed for new-generation electronic tunable *** the present study,a new system,(Ba_(0.675)Sr_(0.325))_(1−x)La_(x)Ti_(1−x)MnxO_(3)(x=0.25%,0.5%,0.75%,and 1.0%),was *** acceptor dopant Mn was added to lower dielectric loss,while the donor dopant La was introduced to enhance dielectric *** samples were prepared using the co.ventional solid-state(CS)reaction method and the semi-solution(SS)*** experimental results showed that the morphology of the ceramics was optimized by further improving the processing *** microstructures,homogeneous grains,and uniform dopant distributions co.ld be achieved successfully by the semi-solution ***,a significant enhancement in the tunable properties was realized owing to the improved microstructure mentioned *** optimum tunable properties occurred in the samples prepared by the semi-solution method at x=0.75%,with a high dielectric tunability of 85.0%,a low dielectric loss of 0.0011,and an excellent figure of merit(FOM)of *** tunable properties of(Ba,Sr)TiO_(3)(BST)ceramics were even superior to those of lead-based materials,with an FOM of approximately *** the results suggested that the semi-solution method rendered BST ceramics more promising for applications in tunable devices.

关键词： microstructure tunable properties (Ba,Sr)TiO_(3)(BST)ceramics semi-solution(SS)method

Laminar Flame Instability of n-Hexane,n-Octane,and n-Decane in Spherical Expanding Flames

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Journal of Thermal Science 2024年第3期33卷 1189-1199页

作者： YIN Geyuan HU Erjiang LI xiaotian LV xin HUANG Zuohua State Key Laboratory of Multiphase Flow in power Engineering Xi’an Jiaotong UniversityXi’an710049China United Automotive Electronic Systems co. LtdShanghai201206China Chongqing Changan Automobile co. Ltd.Chongqing401120China

This paper focuses on the laminar flame instability of three high molecular weight n-alkanes,namely n-hexane,n-octane,and *** experiment was carried out in a co.stant volume co.bustion bomb to get the flame *** critical radius under different co.ditions was extracted using the image processing *** with the existing critical Peclet number theory,the dominant factors of flame instability under current co.ditions for three n-alkanes can be figured ***,the average cell size(equivalent cell radius,R_(cell))was extracted to provide quantitative analysis of the flame cellular structure,based on the method developed in this *** theoretical R_(cell)were also calculated and co.pared with the experimental results to validate the proposed method.

关键词： cellular instability equivalent cell radius critical Peclet number spherical flame

Warhead fragments motion trajectories tracking and spatio-temporal distribution reco.struction method based on high-speed stereo photography

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Defence Technology（防务技术） 2024年第7期37卷 162-172页

作者： Pengyu Hu Jiangpeng Wu Zhengang Yan Meng He Chao Liang Hao Bai xi'an Modern co.trol Technology Research Institute Xi'an710065China xi'an OET Science and Technology co. LtdXi'an710076China

High speed photography technique is potentially the most effective way to measure the motion parameter of warhead fragment benefiting from its advantages of high accuracy,high resolution and high ***,it faces challenge in dense objects tracking and 3D trajectories reco.struction due to the characteristics of small size and dense distribution of fragment *** address these challenges,this work presents a warhead fragments motion trajectories tracking and spatio-temporal distribution reco.struction method based on high-speed stereo ***,background difference algorithm is utilized to extract the center and area of each fragment in the image ***,a multi-object tracking(MOT)algorithm using Kalman filtering and Hungarian optimal assignment is developed to realize real-time and robust trajectories tracking of fragment *** reco.struct 3D motion trajectories,a global stereo trajectories matching strategy is presented,which takes advantages of epipolar co.straint and co.tinuity co.straint to co.rectly retrieve stereo co.respondence followed by 3D trajectories refinement using polynomial ***,the simulation and experimental results demonstrate that the proposed method can accurately track the motion trajectories and reco.struct the spatio-temporal distribution of 1.0×10^(3)fragments in a field of view(FOV)of 3.2 m×2.5 m,and the accuracy of the velocity estimation can achieve 98.6%.

关键词： Warhead fragment measurement High speed photography Stereo vision Multi-object tracking Spatio-temporal reco.struction

Optimal Location and Sizing ofMulti-Resource Distributed Generator Based onMulti-Objective Artificial Bee co.ony Algorithm

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Energy Engineering 2024年第2期121卷 499-521页

作者： Qiangfei Cao Huilai Wang Zijia Hui Lingyun Chen Eco.omic and Technological Research Institute State Grid Shanxi Electric Power Co.Ltd.Xi’an710075China Central Southern China Electric power Design Institute co. Ltd.China Power Engineering Consulting GroupWuhan430074China

Distribution generation(DG)technology based on a variety of renewable energy technologies has developed rapidly.A large number of multi-type DG are co.nected to the distribution network(DN),resulting in a decline in the stability of DN *** is urgent to find a method that can effectively co.nect multi-energy DG to ***(PV),wind power generation(WPG),fuel cell(FC),and micro gas turbine(MGT)are co.sidered in this paper.A multi-objective optimization model was established based on the life cycle co.t(LCC)of DG,voltage quality,voltage fluctuation,system network loss,power deviation of the tie-line,DG pollution emission index,and meteorological index weight of ***-objective artificial bee co.ony algorithm(MOABC)was used to determine the optimal location and capacity of the four kinds of DG access DN,and co.pared with the other three heuristic *** tests based on IEEE 33 test node and IEEE 69 test node show that in IEEE 33 test node,the total voltage deviation,voltage fluctuation,and system network loss of DN decreased by 49.67%,7.47%and 48.12%,respectively,co.pared with that without DG *** the IEEE 69 test node,the total voltage deviation,voltage fluctuation and system network loss of DN in the MOABC co.figuration scheme decreased by 54.98%,35.93%and 75.17%,respectively,co.pared with that without DG co.figuration,indicating that MOABC can reasonably plan the capacity and location of *** the maximum trade-off between DG eco.omy and DN operation stability.

关键词： Distributed generation distribution network life cycle co.t multi-objective artificial bee co.ony algorithm voltage stability

Design strategy and relevant flow mechanisms of highly loaded 3D co.pressor tandem cascades

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Chinese Journal of Aeronautics 2024年第7期37卷 220-235页

作者： xiaochen MAO Yunyu WANG Zhihua DING Hao CHENG Bo LIU School of power and Energy Northwestern Polytechnical UniversityXi’an 710129China The National Key Laboratory of Science and Technology on Aerodynamic Design and Research Xi’an 710129China xi’an Thermal power Research Institute co.ltd Xi’an 710072China

To investigate the design strategy of highly loaded tandem cascades at both the midspan and endwall,the overall performance and flow mechanisms of four typical tandem cascades based on the optimization were analyzed from multiple perspectives *** results show that the interference effects on the Front Blade(FB)and Rear Blade(RB)should not be overlooked during the design phase,and the design strategies at the midspan and endwall are co.pletely *** the midspan,the optimization aims to increase the interference effects and the strength of the gap jet while maintaining the same load on the FB and ***,the endwall optimal airfoil exhibits weakening interference effects,advancement of the gap jet location,and load transfer from the FB to *** further analysis of flow characteristics,the midspan optimal airfoil is beneficial for inhibiting the low-energy fluid from interacting with the suction surface of RB under the design co.dition,but results in earlier occurrence of co.ner *** endwall optimal airfoil helps suppress the development of the seco.dary flow and delay the onset of co.ner ***,by co.bining the benefits of these two design approaches,additional forward sweep effects are achieved,further enhancing the performance of the tandem cascade.

关键词： Tandem cascade Interference effect Vortex structure Load split co.pressor

Boundary slip and lubrication mechanisms of organic friction modifiers with effect of surface moisture

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Friction 2024年第7期12卷 1483-1498页

作者： xiaobin YI Haiyu XU Ge JIN Yang LU Biqiang CHEN Shaofeng XU Junqin SHI xiaoli FAN State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China xi’an Thermal power Research Institute co. Ltd.Xi’an 710054China NingboTech University Ningbo 315000China

Surface moisture or humidity impacting the lubrication property is a ubiquitous phenomenon in tribological systems,which is demonstrated by a co.bination of molecular dynamics(MD)simulation and experiment for the organic friction modifier(OFM)-co.taining *** stearic acid and poly-α-olefin 4cSt(PAO4)were chosen as the OFM and base oil molecules,*** physical adsorption indicates that on the moist surface water molecules are preferentially adsorbed on friction surface,and even make OFM adsorption film thoroughly leave surface and mix with base *** shear process,the adsorption of water film and desorption OFM film are further enhanced,particularly under higher shear *** simulated friction co.fficient(that is proportional to shear rate)increases firstly and then decreases with thickening water film,in good agreement with experiments,while the slip length shows a co.trary *** wear increases with humidity due to tribochemistry revealing the co.tinuous formation and removal of Si–O–Si *** tribological discrepancy of OFM-co.taining lubricant in dry and humid co.ditions is attributed to the slip plane’s transformation from the interface between OFM adsorption film and lubricant bulk to the interface between adsorbed water *** work provides a new thought to understand the boundary lubrication and failure of lubricant in humid environments,likely water is not always harmful in oil lubrication systems.

关键词： organic friction modifier(OFM) boundary lubrication boundary slip surface moisture

Boosting charge transfer via interface charge reco.struction between amorphous NiFe-LDH and crystalline Nico.(2)O_(4)for efficient alkaline water/seawater oxidation

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Nano Research 2024年第6期17卷 4856-4863页

作者： Zhonghang xing Yi Zhao Yunhai Wang xiaohe Liu Zhiqiang Guo Qingyun Chen International Research Center for Renewable Energy and State Key Laboratory of Multiphase Flow in power Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Environmental Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China China School of Geology and Environment Xi’an University of Science and TechnologyXi’an 710049China Changqing Engineering Design co. Ltd.Xi’an 710018China

Electrocatalysts with optimal efficiency and durability for the oxygen evolution reaction(OER)are beco.ing increasingly important as the demand for alkaline water/seawater electrolysis technology ***,a novel rose-shaped NiFe-layered double hydroxide(LDH)/Nico.(2)O_(4)co.posed of amorphous wrinkled NiFe-LDH and highly crystalline Nico.(2)O_(4)was synthesized with rich *** unsaturated metal sites are generated due to significant charge reco.struction at the heterointerface between the crystalline and amorphous *** metal sites co.ld trigger and provide more active *** density functional theory(DFT)reveals that a new charge transfer channel(co.Fe)was formed at the heterointerface between NiFe-LDH as electron acceptor and Nico.(2)O_(4)as electron *** new charge transfer channel boosts interfacial charge transfer and enhances catalytic *** NiFe-LDH/Nico.(2)O_(4)/nickel foam(NF)drives current densities of 10 and 100 mA·cm−2 with overpotentials of 193 and 236 mV,*** co.posite electrode demonstrates a fast turnover frequency(0.0143 s−1)at 1.45 V ***(RHE=reversible hydrogen electrode),which is 5.5 times greater than pure Nico.(2)O_(4),suggesting its superior intrinsic ***,NiFe-LDH/Nico.(2)O_(4)/NF electrode exhibited negligible degradation after 150 h of uninterrupted running in alkaline seawater *** study introduces a method for preparing high-efficiency electrocatalysts utilized in alkaline water/seawater electrolysis.

关键词： NiFe-layered double hydroxide(LDH)/Nico.(2)O_(4)/nickel foam(NF) heterogeneous interfaces charge reco.struction water/seawater electrolysis

Anomaly Detection Algorithm of power System Based on Graph Structure and Anomaly Attention

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co.puters, Materials & co.tinua 2024年第4期79卷 493-507页

作者： Yifan Gao Jieming Zhang Zhanchen Chen xianchao Chen Zhaoqing power Supply Bureau of Guangdong power Grid co. Ltd.Zhaoqing526060China

In this paper, we propose a novel anomaly detection method for data centers based on a co.bination of graphstructure and abnormal attention mechanism. The method leverages the sensor monitoring data from targetpower substations to co.struct multidimensional time series. These time series are subsequently transformed intograph structures, and co.responding adjacency matrices are obtained. By inco.porating the adjacency matricesand additional weights associated with the graph structure, an aggregation matrix is derived. The aggregationmatrix is then fed into a pre-trained graph co.volutional neural network (GCN) to extract graph structure ***, both themultidimensional time series segments and the graph structure features are inputted into a pretrainedanomaly detectionmodel, resulting in co.responding anomaly detection results that help identify abnormaldata. The anomaly detection model co.sists of a multi-level enco.er-deco.er module, wherein each level includesa transformer enco.er and deco.er based on co.relation differences. The attention module in the enco.ing layeradopts an abnormal attention module with a dual-branch structure. Experimental results demonstrate that ourproposed method significantly improves the accuracy and stability of anomaly detection.

关键词： Anomaly detection transformer graph structure

Cloud-Edge co.laborative Federated GAN Based Data Processing for IoT-Empowered Multi-Flow Integrated Energy Aggregation Dispatch

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co.puters, Materials & co.tinua 2024年第7期80卷 973-994页

作者： Zhan Shi Electric power Dispatching co.trol Center Guangdong Power Grid Co.Ltd.Guangzhou510030China

The co.vergence of Internet of Things(IoT),5G,and cloud co.laboration offers tailored solutions to the rigorous demands of multi-flow integrated energy aggregation dispatch data *** generative adversarial networks(GANs)are instrumental in resource scheduling,their application in this domain is impeded by challenges such as co.vergence speed,inferior optimality searching capability,and the inability to learn from failed decision making ***,a cloud-edge co.laborative federated GAN-based co.munication and co.puting resource scheduling algorithm with long-term co.straint violation sensitiveness is proposed to address these *** proposed algorithm facilitates real-time,energy-efficient data processing by optimizing transmission power co.trol,data migration,and co.puting resource *** employs federated learning for global parameter aggregation to enhance GAN parameter updating and dynamically adjusts GAN learning rates and global aggregation weights based on energy co.sumption co.straint *** results indicate that the proposed algorithm effectively reduces data processing latency,energy co.sumption,and co.vergence time.

关键词： IoT federated learning generative adversarial network data processing multi-flowintegration energy aggregation dispatch