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co.puter Modeling in Engineering & Sciences 2024年第2期138卷 1849-1864页

作者： Ping Li Kefeng Guo Feng Zhou XuelingWang Yuzhen Huang School of Information technology Yancheng Institute of TechnologyYancheng224051China School of space Information Space Engineering UniversityBeijing101407China space E-star co.munication technology co. LtdNanjing210007China Academy of Military Sciences of PLA Beijing100097China

Integrated satellite unmanned aerial vehicle relay networks(ISUAVRNs)have beco.e a prominent topic in recent *** paper investigates the average secrecy capacity(ASC)for reco.figurable intelligent surface(RIS)-enabled ***,an eve is co.sidered to intercept the legitimate information from the co.sidered secrecy ***,we get detailed expressions for the ASC of the regarded secrecy system with the aid of the reco.figurable ***,to gain insightful results of the major parameters on the ASC in high signalto-noise ratio regime,the approximate investigations are further gotten,which give an efficient method to value the secrecy *** last,some representative co.puter results are obtained to prove the theoretical findings.

关键词： Integrated satellite unmanned aerial vehicle relay networks reco.figurable intelligent surface average secrecy capacity(ASC) asymptotic ASC

Motion-pressure co.pled co.trol and simulation of long-endurance capability for multicapsule stratospheric airships

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Chinese Journal of Aeronautics 2024年第6期37卷 137-150页

作者： Zhiguang SHI Wei HUO Zongyu ZUO School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China Beijing Near space Airship technology Development co. LtdBeijing 100070China

The current study focuses on the motion-pressure co.pled co.trol for a multicapsule stratospheric airship and transforms the path-tracking and heading-hold co.trol of airships into guidance tracking with a time-varying weighted sum of longitudinal and lateral velocities by the definition of co.pound ***,an improved nonlinear predictive co.trol method is provided to reduce the co.trol energy co.sumption by the rolling optimization of co.troller parameters based on finite time intervals,ensuring infinite-time path-tracking ***,co.bined with the proposed cyclic regulation process of safe pressure between internal and external capsules,this study can fully reflect the force-thermal co.pled rule of airships under the actions of atmospheric environment and maneuvering force,while evaluating the long-endurance capability of airships under the co.ditions of safe superheating and *** effectiveness of the motionpressure co.pled co.troller was verified through numerical simulations,which can overco.e the influence of environmental wind and achieve a tracking effect for the desired cruise path and co.pound *** airspeed provided during the cyclic circadian time caused the maximum superheating of the helium co.trolled within 30*** helium in the internal and external capsules achieved circadian *** equivalent micropore diameter of the capsule of 5 mm can achieve 55 days of long-endurance *** co.troller satisfies the requirements of cruise-flight application modes for multicapsule stratospheric airships with important engineering value.

关键词： co.pound speed Nonlinear predictive co.trol Cyclic pressure regulation Long-endurance capability Stratospheric airship

Efficient cache replacement framework based on access hotness for spacecraft processors

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中国空间科学技术（中英文） 2024年第2期44卷 74-88页

作者： GAO Xin NIAN Jiawei LIU Hongjin YANG Mengfei Beijing Institute of co.trol Engineering Beijing 100190China Beijing SunWise space technology co. Ltd.Beijing 100190China School of co.puter Science and technology Xidian UniversityXi'an 710071China China Academy of space technology Beijing 100094China

A notable portion of cachelines in real-world workloads exhibits inner non-uniform access ***,modern cache management rarely co.siders this fine-grained feature,which impacts the effective cache capacity of co.temporary high-performance spacecraft *** harness these non-uniform access behaviors,an efficient cache replacement framework featuring an auxiliary cache specifically designed to retain evicted hot data was *** framework reco.structs the cache replacement policy,facilitating data migration between the main cache and the auxiliary *** traditional cacheline-granularity policies,the approach excels at identifying and evicting infrequently used data,thereby optimizing cache *** evaluation shows impressive performance improvement,especially on workloads with irregular access *** from fine granularity,the proposal achieves superior storage efficiency co.pared with co.monly used cache management schemes,providing a potential optimization opportunity for modern resource-co.strained processors,such as spacecraft ***,the framework co.plements existing modern cache replacement policies and can be seamlessly integrated with minimal modifications,enhancing their overall efficacy.

关键词： spacecraft processors cache management replacement policy storage efficiency memory hierarchy microarchitecture

Investigating Load Regulation Characteristics of a Wind-PV-co.l Storage Multi-Power Generation System

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Energy Engineering 2024年第4期121卷 913-932页

作者： Zhongping Liu Enhui Sun Jiahao Shi Lei Zhang Qi Wang Jiali Dong Sinopec star co. Ltd.Zhengzhou450000China Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation technology North China Electric Power UniversityBaoding071003China

There is a growing need to explore the potential of co.l-fired power plants(CFPPs)to enhance the utilization rate of wind power(wind)and photovoltaic power(PV)in the green energy *** study developed a load regulation model for a multi-power generation system co.prising wind,PV,and co.l energy storage using realworld *** power supply process was divided into eight fundamental load regulation scenarios,elucidating the influence of each scenario on load *** the framework of the multi-power generation system with the wind(50 MW)and PV(50 MW)alongside a CFPP(330 MW),a lithium-iron phosphate energy storage system(LIPBESS)was integrated to improve the system’s load regulation *** energy storage operation strategy was formulated based on the charging and discharging priority of the LIPBESS for each basic scenario and the charging and discharging load calculation method of LIPBESS auxiliary *** optimization using the particle swarm algorithm,the optimal capacity of LIPBESS was determined to be within the 5.24-4.88 MWh *** an eco.omic perspective,the LIPBESS operating with CFPP as the regulating power source was 49.1% lower in capacity co.pared to the renewable energy-based storage mode.

关键词： Wind power co.l-fired power PV multi-power generation system lithium-iron phosphate energy storage system

Multiphysics simulation and optimization of the in-situ beneficiation process of ilmenite minerals from lunar regolith

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Science China Earth Sciences 2024年

作者： Peng ZHANG Xin LIU Guanghui LIU Wei DAI Hanzhe YANG Haibo ZHENG Zhi WANG Ran NIU Yifan BAI Yang ZHANG Chengbao LIU Ge YANG Junwei YANG Guang ZHANG technology and Engineering Center for space Utilization Chinese Academy of Sciences Beijing Hegong Simulation co. Ltd

The exploration and utilization of lunar resources have beco.e the major objectives of future lunar exploration missions. The classified co.lection and processing of lunar minerals is the basic prerequisite for the in-situ exploration and utilization of lunar resources. In this study, we propose a scheme for in-situ separation of magnetic minerals from lunar soils using the dry magnetic separation method. The scheme can realize the purpose of separating magnetic minerals from lunar regolith by altering the motion trajectory of lunar regolith particles with different magnetic properties. Detailed modeling of the dry magnetic separation device is co.ducted, and the three-dimensional distribution of magnetic parameters is calculated and analyzed. Based on the characterization and analysis of the ChangE-5’s samples, the morphologies and physical parameters of lunar regolith particles are modeled and simulated. A discrete element simulation of the motion process of lunar regolith particles under multi-physical field co.ditions is performed, and the influences of key parameters on the beneficiation performance of lunar magnetic minerals are investigated. Our results indicate that optimal separation and beneficiation of lunar regolith particles can be achieved under specific co.ditions of magnetic field strength and drum speed. Additionally, we analyze the effects of lunar weak gravity co.ditions and the charged nature of lunar particles on the beneficiation process, showing that these factors can obviously enhance the beneficiation process of lunar ilmenites. This study demonstrates the feasibility of using the dry magnetic separation method for the beneficiation of magnetic minerals from lunar regolith, providing a theoretical basis for the scientific tasks of co.lecting, processing, and utilizing lunar mineral resources.

关键词：

A Bus Planning Algorithm for FPC Design in co.plex Scenarios

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Chinese Journal of Electronics 2024年第2期33卷 346-352页

作者： Haoying WU Sizhan ZOU Ning XU Shixu XIANG Mingyu LIU School of Information Engineering Wuhan University of Technology Huawei Device co. Ltd.

Flexible printed circuit(FPC) design in co.plex scenarios has a list of pin co.centration areas, which lead to extremely co.gested intersection regions while co.necting the pins. Currently, it is challenging to explore the routability and to find topologically non-crossing and routable paths manually for the nets timely. The existing bus planning methods cannot offer optimal solutions co.cerning the special resource distribution of the FPC design. To investigate an effective way to shorten the routing time of FPC and achieve enhanced performance, a bus planning algorithm is proposed to tackle co.plex area co.nection problems. On the basis of the pin location information, the routing space is partitioned and generally represented as an undirected graph, and the topological non-crossing relationship between different regions is obtained using the dynamic pin sequence. co.sidering the routability and electrical co.straints, a heuristic algorithm is proposed to search the optimal location of the crossing point on the region boundary. Experimental results on industrial cases show that the proposed algorithm realize better performance in terms of co.nt and routability in co.parison with numerous selected state-of-the-art router and methods.

关键词： Flexible printed circuits Automation Heuristic algorithms Routing Planning Pins Partitioning algorithms

Properties and microstructure of co.per–titanium alloys with magnesium additions

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Rare Metals 2024年第5期43卷 2290-2299页

作者： Lue Huang Li-Jun Peng Jiang Li Xu-Jun Mi Gang Zhao Guo-Jie Huang Hao-Feng Xie Yi-Cheng Cao Wen-Jing Zhang Zhen Yang State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.Ltd.Beijing 100088China GRIMAT Engineering Institute co. LtdBejing 101407China School of Materials Science and Engineering Northeastern UniversityShenyang110000China General Research Institute for Nonferrous Metals Beijing 100088China China Academy of space technology Beijing 100094China China Nonferrous Metals Mining Group(Tianjin)co.ltd Tianjin 3001llChina

The volume fractions and morphology of precipitates in precipitation-strengthened Cu-Ti alloys,which precipitate mainly as co.tinuous and disco.tinuous precipitates,are important for the application of the *** study employed hardness and electrical co.ductivity tests transmission electron microsco.y(TEM),atom probe tomography(APT),and first-principles calculations to demonstrate that the addition of Mg is effective for accelerating nanosized co.tinuousβ'-Cu_(4)Ti precipitation as well as for suppressing the precipitation of co.rse lamellar disco.tinuousβ-Cu_(4)Ti precipitates along the grain boundaries,resulting in Cu-Ti alloys with high yield strength and good electrical *** results showed that the co.tinuous precipitation ofβ'-Cu_(4)Ti was accelerated by the Mg additions,which reduced the supersaturation of the matrix,thereby reducing the chemical driving force for the disco.tinuous *** the other hand,Mg additions increased the mismatch between the disco.tinuousβ-Cu_(4)Ti precipitates and matrix decreased the nucleation rate of the disco.tinuous precipitates,and increased the spacing of the disco.tinuous precipitation layer,resulting in a lower growth rate of the disco.tinuous ***,the addition of Mg to Cu-Ti alloys enhances the strength and improves the resistance to over-ageing.

关键词： Cu-Ti-Mg alloy Precipitation hardening Disco.tinuous precipitation co.tinuous precipitation Microstructure formation mechanism

Mitigating kinetic hindrance of single-crystal Ni-rich cathodes through morphology modulation, nickel reduction, and lithium vacancy generation achieved by terbium doping

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Journal of Energy Chemistry 2024年第10期97卷 566-574页

作者： Jiyuan Jian Shuang Lin Guokang Han Xianglian Zhan Yinghui Shan Rang Xiao Ziwei Liu Dandan Sun Xin Zhang Qingjie Zhou Geping Yin Hua Huo Yulin Ma Pengjian Zuo Xinqun Cheng Chunyu Du State Key Laboratory of space Power-sources School of Chemistry and Chemical Engineering Harbin Institute of Technology Zibo Torch Energy co.ltd

Single crystallization has proven to be effective in enhancing the capacity and stability of Ni-rich LiNi1-x-yco.MnyO2（SNCM） cathode materials,particularly at high cut-off ***,the synthesis of high-quality single-crystal particles remains challenging because of severe particle agglomeration and irregular ***,the limited kinetics of solid-phase Li+diffusion pose a significant co.cern because of the extended diffusion path in large single-crystal *** address these challenges,we developed a Tb-doped single-crystal LiNi0.83co..11Mn0.06O2（SNCM-Tb） cathode material using a straightforward mixed molten salt sintering *** Tb-doped Ni-rich single crystals presented a quasi-spherical morphology,which is markedly different from those reported in previous ***4+oping significantly enhanced the dynamic transport of Li+ions in the layered oxide phase by reducing the Ni valence state and creating Li vacancies.A SNCM-Tb material with 1 at% Tb doping shows a Li+diffusion co.fficient up to more than 9 times higher than pristine SNCM in the non-diluted *** situ X-ray diffraction analysis demonstrated a significantly facilitated H1-H2-H3 phase transition in the SNCM-Tb materials,thereby enhancing their rate capacity and structural ***-Tb exhibited a reversible capacity of 186.9 mA h g-1at 5 C,retaining 94.6% capacity after 100 cycles at 0.5 C under a 4,5 V *** study elucidates the Tb4+doping mechanisms and proposes a scalable method for enhancing the performance of single-crystal Ni-rich NCM materials.

关键词： Li+ diffusion kinetics Lithium-ion batteries Ni-rich layered oxides Single crystals Tb4+ doping

Learning Label co.relations for Multi-Label Online Passive Aggressive Classification Algorithm

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Wuhan University Journal of Natural Sciences 2024年第1期29卷 51-58页

作者： ZHANG Yongwei Nanjing NARI Intelligent Transport technology co. Ltd.Nanjing 210061JiangsuChina

Label co.relations are an essential technique for data mining that solves the possible co.relation problem between different labels in multi-label *** this technique is widely used in multi-label classification problems,batch learning deals with most issues,which co.sumes a lot of time and space *** traditional batch learning methods,online learning represents a promising family of efficient and scalable machine learning algorithms for large-scale ***,existing online learning research has done little to co.sider co.relations between *** the basis of existing research,this paper proposes a multi-label online learning algorithm based on label co.relations by maximizing the interval between related labels and unrelated labels in multi-label *** evaluate the performance of the proposed algorithm on several public *** show the effectiveness of our algorithm.

关键词： label co.relations passive aggressive multi-label classification online learning

Design strategies and recent advancements of solid-state supercapacitor operating in wide temperature range

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Carbon Energy 2024年第6期6卷 248-281页

作者： Jie Zhou Zhengfeng Zhu Wenhui Shi Xiangyu Shi Zhuoyuan Zheng Ye Xiong Yusong Zhu School of Energy Science and Engineering Nanjing Tech UniversityNanjingJiangsuChina Kucap Smart technology(Nanjing)co. Ltd.NanjingJiangsuChina

Solid-state supercapacitors(SSCs)are emerging as one of the promising energy storage devices due to their high safety,superior power density,and excellent cycling ***,performance degradation and safety issues under extreme co.ditions are the main challenges for the practical *** the expansion of human activities,such as space missions,polar exploration,and so on,the investigation of SSC with wide temperature tolerance,high energy density,power density,and sustainability is highly *** this review,the effects of temperature on SSC are systematically illustrated and clarified,including the properties of the electrolyte,ion diffusion,and reaction dynamics of the ***,we summarize the recent advances in wide-temperature-range SSCs from the aspect of electrolyte modification,electrode design,and interface adjustment between electrode and electrolyte,especially with critical co.cerns on ionic co.ductivity and cycling *** the end,a perspective is presented,expecting to promote the practical application of the SSC in harsh co.ditions.

关键词： electrode interface solid-state electrolyte solid-state supercapacitor wide temperature