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Estimation-Correction Modeling and Chaos Control of Fractional- Order Memristor Load Buck-Boost Converter

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Complex System Modeling and Simulation 2024年第1期4卷 67-81页

作者： Lin Wang Cong Wang Hongli Zhang ping ma Shaohua Zhang School of Electrical Engineering Xinjiang UniversityUrumqi 830017China

A fractional-order memristor load Buck-Boost converter causes periodic system oscillation,electromagnetic noise,and other phenomena due to the frequent switching of the switch in actual operation,which is detrimental to the stable operation of the power electronic *** is of great significance to the study of the modeling method and chaos control strategy to suppress the nonlinear behavior of the Buck-Boost converter and expand the safe and stable operation range of the power *** estimation-correction modeling method based on a fractional active voltage-controlled memristor load peak current Buck-Boost converter is *** discrete numerical solution of the state variables in the continuous mode of the inductor current is *** bursting oscillation phenomenon when the system introduces external excitation is *** bifurcation,Lyapunov exponent,and phase diagrams,a large number of numerical simulations are *** results show that the Buck-Boost converter is chaotic for certain selected parameters,which is the prerequisite for the introduction of the *** on the idea of parameter perturbation and state association,a three-dimensional hybrid control strategy for a fractional memristor Buck-Boost converter is *** effectiveness of the control strategy is verified by simulations,and it is confirmed that the system is controlled in a stable periodic state when the external tunable parameter s,which represents the coupling strength between the state variables in the system,gradually decreases in[-0.4,0].Compared with integer-order controlled systems,the stable operating range of fractional-order controlled systems is much larger.

关键词： fractional-order memristor Buck-Boost converter estimation-correction algorithm hybrid control strategy bursting oscillation

Design and application of copper/lithium composite anodes for advanced lithium metal batteries

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Rare Metals 2024年第3期43卷 942-970页

作者： Bin Zhang Ji-ping ma Yang Zhao Tong Li Jin-Lin Yang Zhan-Ling Zhang Shi-Zhong Wei Guang-Min Zhou School of materials Science and Engineering Henan University of Science and TechnologyLuoyang 471003China Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China School of Physical and mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore Shenzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen InstituteTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China

Lithium(Li)is a promising candidate for nextgeneration battery anode due to its high theoretical specific capacity and low reduction ***,safety issues derived from the uncontrolled growth of Li dendrite and huge volume change of Li hinder its practical application.C onstructing dendrite-free composite Li anodes can significantly alleviate the above ***(Cu)-based materials have bee n widely used as substrates of the composite electrodes due to their chemical stability,excellent conductivity,and good mechanical ***/lithium(Cu/Li)composite anodes significantly regulate the local current density and decrease Li nucleation overp otential,realizing the uniform and dendrite-free Li *** this review,Cu/Li composite methods including electrodeposition,melting infusion,and mechanical rolling are systematically summarized and ***,design strategies of Cu-based current collectors for high performance Cu/Li composite anodes are *** challenges and future development for Cu/Li composite anodes are presented and *** hope that this review can provide a comprehensive understanding of Cu/Li composite methods of the latest development of Li metal anode and stimulate more research in the future.

关键词： Lithium metal batteries Cu/Li composite anode Electrodeposition Thermal melting infusion Mechanical rolling

Valence-tailored copper-based nanoparticles for enhanced chemodynamic therapy through prolonged ROS generation and potentiated GSH depletion

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Nano Research 2024年第7期17卷 6342-6352页

作者： Xinyang Li Binbin Ding Jing Li Di Han Hao Chen Jia Tan Qi Meng Pan Zheng ping’an ma Jun Lin State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China

Chemodynamic therapy(CDT),an inventive approach to cancer treatment,exploits innate chemical processes to trigger cell death through the generation of reactive oxygen species(ROS).While offering advantages over conventional treatments,the optimization of CDT efficacy presents challenges stemming from suboptimal catalytic efficiency and the counteractive ROS scavenging effect of intracellular glutathione(GSH).In this study,we aim to address this dual challenge by delving into the role of copper valence states in *** the unique attributes of copper-based nanoparticles,especially zero-valent copper nanoparticles(CuPd NPs),we aim to enhance the therapeutic potential of *** experiments reveal that zero-valent CuPd NPs outperform divalent copper nanoparticles(Ox-CuPd NPs)by displaying superior catalytic performance and sustaining ROS generation through a dual approach integrating peroxidase-like(POD-like)activity and Cu+***,zero-valent NPs exhibit enhanced GSH depletion compared to their divalent counterparts,thereby intensifying CDT and inducing ferroptosis,ultimately resulting in high-efficiency tumor growth *** findings reveal the impact of valences on CDT,providing novel insights for the optimization and design of CDT agents.

关键词： CuPd nanoparticle ferroptosis chemodynamic therapy valance tailoring tumor therapy

Zircon U-Pb ages in the Nuratau ophiolitic mélange in the southern Tianshan,Uzbekistan:Implication for the closure of Paleo-Asian Ocean

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China Geology 2024年第2期7卷 365-368,I0004-I0007页

作者： Kai Weng Ji-fei Cao Divayev-Farid Karibovich Jahongir-Jurabekovich Movlanov Bo Chen Zhong-ping ma Xi’an Center of Geological Survey China Geological SurveyXi’an 710119China The Center for Geoinnovation Technologies Doctor of Sciences in Geology and Mineralogy University of Geological ScienceTashkent 100060Uzbekistan

*** The Central Asian Orogenic Belt(CAOB),which is located between the European craton,Siberian craton,and Tarim-North China craton(Fig.1a),is the largest phanerozoic accretionary orogen in the *** resulted from the longterm subduction and accretion of the Paleo-Asian Ocean(PAO).The PAO has been in existence since at least the late Mesoproterozoic(about 1020 ma).However,there has been debate about the closing time of the PAO.

关键词： Asian Paleo Tianshan

Short-term displacement prediction for newly established monitoring slopes based on transfer learning

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China Geology 2024年第2期7卷 351-364页

作者： Yuan Tian Yang-landuo Deng Ming-zhi Zhang Xiao Pang Rui-ping ma Jian-xue Zhang Institute of Remote Sensing and Geographical Information Systems Peking UniversityBeijing 100871China Beijing Key Laboratory of Spatial Information Integration and Its Applications Beijing 100871China Institute of Public Safety Research Department of Engineering PhysicsTsinghua UniversityBeijing 100084China China Institute of Geo-Environment Monitoring Beijing 100081China Technology Innovation Center for Geohazard Monitoring and Risk Early Warning Ministry of Natural ResourcesBeijing 100081China

This study makes a significant progress in addressing the challenges of short-term slope displacement prediction in the Universal Landslide Monitoring Program,an unprecedented disaster mitigation program in China,where lots of newly established monitoring slopes lack sufficient historical deformation data,making it difficult to extract deformation patterns and provide effective predictions which plays a crucial role in the early warning and forecasting of landslide hazards.A slope displacement prediction method based on transfer learning is therefore ***,the method transfers the deformation patterns learned from slopes with relatively rich deformation data by a pre-trained model based on a multi-slope integrated dataset to newly established monitoring slopes with limited or even no useful data,thus enabling rapid and efficient predictions for these ***,as time goes on and monitoring data accumulates,fine-tuning of the pre-trained model for individual slopes can further improve prediction accuracy,enabling continuous optimization of prediction results.A case study indicates that,after being trained on a multi-slope integrated dataset,the TCN-Transformer model can efficiently serve as a pretrained model for displacement prediction at newly established monitoring *** three-day average RMSE is significantly reduced by 34.6%compared to models trained only on individual slope data,and it also successfully predicts the majority of deformation *** fine-tuned model based on accumulated data on the target newly established monitoring slope further reduced the three-day RMSE by 37.2%,demonstrating a considerable predictive *** conclusion,taking advantage of transfer learning,the proposed slope displacement prediction method effectively utilizes the available data,which enables the rapid deployment and continual refinement of displacement predictions on newly established monitoring slopes.

关键词： Landslide Slope displacement prediction Transfer learning Integrated dataset Transformer Pre-trained model Universal Landslide Monitoring Program(ULMP) Geological hazards survey engineering

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人类免疫缺陷病毒感染相关血脂异常研究进展

中华内科杂志 2024年第3期63卷 303-309页

作者：李磊马萍天津市第二人民医院感染二科天津300192

人类免疫缺陷病毒(HIV)感染者常见脂质代谢异常,导致该类人群心血管疾病患病率增加。HIV全病程管理使包括心血管疾病在内的非艾滋定义性疾病(NAD)得到关注,抗反转录病毒疗法(ART)与血脂异常的关系以及不同类别的ART药物对血脂水平的影... 详细信息

人类免疫缺陷病毒(HIV)感染者常见脂质代谢异常,导致该类人群心血管疾病患病率增加。HIV全病程管理使包括心血管疾病在内的非艾滋定义性疾病(NAD)得到关注,抗反转录病毒疗法(ART)与血脂异常的关系以及不同类别的ART药物对血脂水平的影响差异需要引起重视。本文基于临床证据和国内外文献、指南及专家共识,对HIV感染者/AIDS患者(PLWHA)血脂异常的危险因素与诊疗管理方式进行总结和展望。

关键词： HIV 血脂异常抗反转录病毒治疗血脂管理

Polarity-controllable magnetic skyrmion filter

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Chinese Physics B 2024年第10期33卷 400-404页

作者： Xiao-Lin Ai Hui-Ting Li Xue-Feng Zhang Chang-Feng Li Je-Ho Shim Xiao-ping ma Hong-Guang Piao Hubei Engineering Research Center of Weak magnetic-Field Detection College of ScienceChina Three Gorges UniversityYichang 443002China Department of Physics College of ScienceYanbian UniversityYanji 133002China

The skyrmion generator is one of the indispensable components for the future functional skyrmion devices,but the process of generating skyrmion cannot avoid mixing with other magnetic textures,such as skyrmionium and nested skyrmion *** mixed magnetic textures will inevitably lead to the blockage of skyrmion transport and even the distortion of data ***,the design of an efficient skyrmion filter is of great significance for the development of skyrmion-based spintronic *** this work,a skyrmion filter scheme is proposed,and the high-efficiency filtering function is demonstrated by micromagnetic *** results show that the filtering effect of the scheme depends on the structure geometry and the spin current density that drives the *** on this scheme,the polarity of the filtered skyrmion can be controlled by switching the magnetization state at the output end,and the“cloning”of the skyrmion can be realized by geometric optimization of the *** believe that in the near future,the skyrmion filter will become one of the important components of skyrmion-based spintronic devices in the future.

关键词： spintronics skyrmions skyrmion filter skyrmion polarity skyrmion clone

Reverse thinking:Tumor nutritional therapy

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BMEmat(BioMedical Engineering materials) 2024年第3期2卷 1-3页

作者： Binbin Ding ping'an ma Abdulaziz A.Al Kheraif Jun Lin State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunChina School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefeiChina Dental Health Department College of Applied Medical SciencesKing Saud UniversityRiyadhSaudi Arabia

Tumor cells often exhibit metabolic abnormalities to meet the needs of rapid proliferation,and targeting tumor metabolism has become one of the effective strategies for cancer ***,most of the current methods targeting metabolism focus on inhibiting hyperactivated metabolic pathways,hindering their further application.A recent innovative work,proposed a nutrient-based strategy to reactivate metabolism for tumor therapy by targeting suppressed metabolic *** approach through delivering nutrients to tumor cells directly using nanotechnology indicates that specific nutrients can serve as potent activators of metabolic *** a new direction along the reverse thinking,this study suggests that this nutrient-based metabolism reactivation strategy will inspire broad applications in the treatment of other diseases associated with metabolic disorders,besides tumor.

关键词： melanogenesis metabolism reactivation nanomicelle nutrient delivery tumor nutritional therapy

Co-doped BaFe_(2)As_(2) Josephson junction fabricated with a focused helium ion beam

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Chinese Physics B 2024年第4期33卷 181-186页

作者：陈紫雯张焱马平徐中堂李宇龙王越路建明马衍伟甘子钊 Applied Superconductivity Research Center Peking UniversityBeijing 100871China State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Peking UniversityBeijing 100871China Institute of Condensed matter Physics School of PhysicsPeking UniversityBeijing 100871China Yangtze Delta Institute of Optoelectronics Peking UniversityBeijing 100871China Key Laboratory of Applied Superconductivity Institute of Electrical EngineeringChinese Academy of SciencesBeijing 100190China

Josephson junction plays a key role not only in studying the basic physics of unconventional iron-based superconductors but also in realizing practical application of thin-film based devices,therefore the preparation of high-quality iron pnictide Josephson junctions is of great *** this work,we have successfully fabricated Josephson junctions from Co-doped BaFe_(2)As_(2)thin films using a direct junction fabrication technique which utilizes high energy focused helium ion beam(FHIB).The electrical transport properties were investigated for junctions fabricated with various He^(+)irradiation *** junctions show sharp superconducting transition around 24 K with a narrow transition width of 2.5 K,and a dose correlated foot-structure resistance which corresponds to the effective tuning of junction properties by He^(+)*** J_c suppression by more than two orders of magnitude can be achieved by increasing the He^(+)irradiation dose,which is advantageous for the realization of low noise ion pnictide thin film *** Shapiro steps are observed under 10 GHz microwave *** above results demonstrate the successful fabrication of high quality and controllable Co-doped BaFe_(2)As_(2)Josephson junction with high reproducibility using the FHIB technique,laying the foundation for future investigating the mechanism of iron-based superconductors,and also the further implementation in various superconducting electronic devices.

关键词： focused helium ion beam Co doped BaFe_(2)As_(2) Josephson junction