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Research on the Evaluation and Optimization Strategy of Children's School Commuting Path in Cold Climate Cities from the Perspective of Child-Friendliness: Taking Harbin as an Example

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China City Planning Review 2025年第1期34卷 41-49页

作者： Liu Yibo Sun Cheng Qian Fang(Translated) School of Architecture and Design Harbin Institute of Technology Key Laboratory of National Territory Spatial Planning and Ecological Restoration in Cold Regions Ministry of Natural Resources Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information Technology 不详

The school commuting path is an important space for elementary school students to engage with society and *** design of these paths reflects concerns for children's rights and healthy development and has crucial impacts on creating supportive environments for *** scientific evaluation of the child-friendly level of school commuting paths forms a significant basis for shaping child-friendly environments and promoting the comprehensive development of ***,due to the unique climatic conditions,cold climate cities excert a distinct impact on children's behavior,activities,and physical and mental health compared to cities in other climate *** study,from the perspective of child-friendliness,constructs an evaluation system for school commuting paths in cold climate cities,based on children's behavioral characteristics and environmental *** system includes dimensions such as safety,diversity,and *** children and their caregivers as the evaluators,the study applies structural equation modeling to assign weights to the various dimension indicators in the evaluation *** research focuses on five elementary schools in the Nangang District of Harbin City,using methods such as machine learning,space syntax,and field surveys to assess the school commuting *** upon these findings,the study constructs the characteristic profile of the commuting paths and proposes evidence-based control and optimization strategies for different types of school commuting paths in cold climate cities from a child-friendly perspective.

关键词： child-friendly cold climate cities children's school commuting path evaluation optimization strategy

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A Mixed-State Particle Filter for Remaining Useful Life Prediction of Lithium-Ion Batteries

SSRN

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SSRN 2024年

作者： Huang, Mengqi Du, Zhengyu Lu, Ruibo Wang, Xiaoji Peng, Changhong School of Nuclear Science and Technology University of Science and Technology of China Anhui Hefei230027 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Sichuan Chengdu610213 China

Lithium-ion batteries are extensively used in medical, transportation, industrial, and other applications due to rapid charging and discharging, constant power output, and light weight. Accurately predicting their remaining useful life (RUL) is essential for safe, reliable operation and timely maintenance. This paper presents a two-stage model based on symbolic regression and particle filter, aims to address the issues present in the current research on lithium-ion battery lifetime prediction. These issues include difficulties in early prediction, using a single degradation model, and the failure to consider the uncertainty of prediction. The proposed model constructs a fuzzy transition point between the two stages based on the degradation process similarity of history and operational batteries. Historical battery degradation data were employed to train the two-stage degradation model using symbolic regression. Parameter updating and state prediction of the degradation model were carried out using an improved mixed-state particle filter. This method can calculate the batteries RUL and their distribution. The performance was evaluated by analysing the CALCE and MIT datasets. The prediction error was less than 22 cycles, over 50% lower than the commonly used FCNN and LSTM timing prediction algorithms, demonstrating the feasibility and effectiveness of the method. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Controlling antifungal activity with light:Optical regulation of fungal ergosterol biosynthetic pathway with photo-responsive CYP51 inhibitors

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Acta Pharmaceutica Sinica B 2023年第7期13卷 3080-3092页

作者： Zhuang Li Na Liu Wanzhen Yang Jie Tu Yahui Huang Wei Wang Chunquan Sheng State Key Laboratory of Bioengineering Reactor And Shanghai Key Laboratory of New Drug DesignSchool of PharmacyEast China University of Science&TechnologyShanghai 200237China School of Pharmacy Second Military Medical University(Naval Medical University)Shanghai 200433China Department of Pharmacology and Toxicology College of PharmacyAnd BIO5 InstituteUniversity of ArizonaTucsonAZ 85721USA

Invasive fungal infections(IFIs)have been associated with high mortality,highlighting the urgent need for developing novel antifungal *** the first light-responsive antifungal agents were designed by optical control of fungal ergosterol biosynthesis pathway with photocaged triazole lanosterol 14a-demethylase(CYP51)*** photocaged triazoles completely shielded the *** content of ergosterol in fungi before photoactivation and after photoactivation was 4.4%and 83.7%,***,the shielded antifungal activity(MIC80≥64μg/m L)could be efficiently recovered(MIC80=0.5—8μg/m L)by light *** new chemical tools enable optical control of fungal growth arrest,morphological conversion and biofilm *** ability for highprecision antifungal treatment was validated by in vivo *** light-activated compound A1 was comparable to fluconazole in prolonging survival in Galleria mellonella larvae with a median survival of 14 days and reducing fungal burden in the mouse skin infection ***,this study paves the way for precise regulation of antifungal therapy with improved efficacy and safety.

关键词： Antifungal agents Ergosterol biosynthesis Triazoles Photocaged Optical control

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Blast wave characteristics of multi-layer composite charge:Theoretical analysis,numerical simulation,and experimental validation

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Defence technology（防务技术） 2023年第1期19卷 91-102页

作者： Jun-bao Li Wei-bing Li Xiao-wen Hong Jia-xin Yu Jian-jun Zhu ZNDY of Ministerial Key Laboratory Nanjing University of Science and TechnologyNanjing210094China Inner Mongolia Metal Material Research Institute Yantai264003China China Ship Development and Design Center Wuhan 430064China

This article investigates the characteristics of shock wave overpressure generated by multi-layer composite charge under different detonation *** dimensional analysis and the explosion mechanism of the charge,a peak overpressure prediction model for the composite charge under singlepoint detonation and simultaneous detonation was *** effects of the charge structure and initiation method on the overpressure field characteristics were investigated in AUTODYN *** accuracy of the prediction model and the reliability of the numerical simulation method were subsequently verified in a series of static explosion *** results reveal that the mass of the inner charge was the key factor determining the peak overpressure of the composite charge under single-point *** peak overpressure in the radial direction improved apparently with an increase in the aspect ratio of the *** overpressure curves in the axial direction exhibited a multi-peak phenomenon,and the secondary peak overpressure even exceeded the primary peak at distances of 30D and 40D(where D is the charge diameter).The difference in peak overpressure among azimuth angles of 0-90°gradually decreased with an increase in the propagation distance of the shock *** coupled effect of the detonation energy of the inner and outer charge under simultaneous detonation improved the overpressure in both radial and axial *** difference in peak overpressure obtained from model prediction and experimental measurements was less than 16.4%.

关键词： Blast wave characteristics Multi-layer composite charge Dimensional analysis AUTODYN mapping Model Explosion experiment

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Experimental and Numerical Research on Droplet Drag Coefficient and Deformation Coefficient in Nuclear Power Plants 29

Experimental and Numerical Research on Droplet Drag Coeffici...

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2022 29th International Conference on Nuclear Engineering, ICONE 2022

作者： Ru, Li Ruifeng, Tian Bowen, Chen Bo, Wang Harbin Engineering University Heilongjiang Provincial Key Laboratory of Nuclear Power System & Equipment Harbin China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9780791886502

There are many multiphase flow phenomena in steam generators (SG) of nuclear power plants (NPPs) and the movement of droplets affects the separation efficiency of dryers in SG. And the most important factor affecting droplet movement is drag force on droplet. Drag force coefficient (DRC) and deformation coefficient (DEC) as characterization coefficient of drag force have important research significance. In this paper, water and silicone oil are used as continuous phase and dispersed phase, respectively. Study on variation of the DRC when Re is in the range of 30-1200 is carried out. Firstly, the motion of droplets (MDs) of different sizes is visually studied by using the high-speed camera and images of MD is acquired. The droplet contour is recognized based on principle of boundary differentiation and the centroid coordinates of the droplet are determined, thus DRC and DEC are obtained. Besides, the relationship between DRC and DEC are researched. Additionally, Lattice Boltzmann Method (LBM) is used to simulate the droplet motion. The simulation results are compared with the experimental results, thus verifying the feasibility of LBM method to simulate the MD. The results show that when velocity of droplet (VD) is low, DRC is inversely proportional to VD. While VD is high, DRC is constant. When the droplet diameter (DD) is small, the final VD is proportional to DD, and when DD is large, the final VD is proportional to the square of DD. The DEC is linearly related to We. The larger the We, the smaller the DEC. Shan-Chen model of LBM is feasible for droplets with low Reynolds number (Re), while the simulation of droplets with high Re is the future prospect. © 2022 by ASME.

关键词： Numerical methods

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A novel cobalt-free oxide dispersion strengthened medium-entropy alloy with outstanding mechanical properties and irradiation resistance

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Journal of Materials science & technology 2023年第21期152卷 190-200页

作者： Ao Fu Bin Liu Bo Liu Yuankui Cao Jian Wang Tao Liao Jia Li Qihong Fang Peter K.Liaw Yong Liu State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China State Key Lab of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA

A novel cobalt-free oxide dispersion strengthened(ODS)equiatomic FeCrNi medium entropy alloy(MEA)was successfully fabricated through mechanical alloying and hot extrusion(HE).The ODS FeCrNi MEA is composed of a single face-centered cubic(FCC)matrix,in which highly dispersed oxide nanoparticles,including Y_(2)Ti_(2)O_(7),Y_(2)TiO_(5) and Y_(2)O_(3),are uniformly *** with the FeCrNi MEA,the ODS FeCrNi MEA exhibits the improved yield strength(1120 MPa)and ultimate tensile strength(1274 MPa)with adequate ductility retention(12.1%).Theoretical analysis of the strengthening mechanism indicates that the high strength is mainly attributed to the grain-boundary strengthening caused by fine grains and the precipitation strengthening resulted from the oxide ***,the matrix that easily activates mechanical twinning during the deformation process is the main reason to ensure moderate *** addition,the introduction of high-density oxide nanoparticles can disperse the defect distri-bution and suppress the defect growth and irradiation-induced segregation,leading to the excellent irra-diation *** findings provide innovative guidance for the development of high-performance structural materials for future nuclear energy applications with balanced strength and ductility.

关键词： Medium-entropy alloys Irradiation Oxide nanoparticles Strength Deformation mechanism

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Failure-analysis of carbon nanotubes and their extreme applications

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Nano Research 2023年第11期16卷 12364-12383页

作者： Mingquan Zhu Yunxiang Bai Runyi Gao Yajing Liu Peng Zhang Hui Zhang Luqi Liu Zhong Zhang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China

The study of material failure is crucial for the design of engineering applications,as it can have significant social and economic *** nanotubes(CNTs),with their exceptional electrical,mechanical,and thermal properties,hold immense potential for a wide range of cutting-edge applications such as superstrong fiber,lightning strike protector,and even space *** review provides an overview of the advancement in understanding the mechanical and electrical failure study of CNTs and their assemblies,serving as a comprehensive reference for utilizing CNTs in various *** begin,we emphasize the importance of studying material failure and provide a brief introduction to ***,we explore the mechanical and electrical failure characteristics of CNTs and their assemblies,along with notable examples of applications that utilize their failure-resistant properties,such as flywheel energy storage and lightning strike ***,we present perspectives associated with analyzing CNT failure and its implications for extreme applications.

关键词： carbon nanotubes failure-analysis flywheel energy storage lightning strike protection

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The Innovative Method of Flexible Arc Extinction in Power Distribution Networks Using the Voltage of the Non-Fault Phase Feeder Line 5

The Innovative Method of Flexible Arc Extinction in Power Di...

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5th International Conference on Smart Grid and Energy Engineering, SGEE 2024

作者： Zhuo, Chao Xiao, Yang Zeng, Xiangjun Xiao, Jun Liu, Feng Xie, Liwei Changsha University of Science & Technology Changsha University of Science and Technology State Key Laboratory of Disaster Prevention & Reduction for Power Grid Changsha China Hunan Jiangbang Design Co. Ltd. Changsha China

ISBN: (纸本)9798331530686

Considering that the majority of China's power distribution networks are small current grounding systems, the existing mainstream flexible arc extinction devices need to be connected to the system's neutral point. This paper proposes a new method of flexible arc extinction based on the voltage of the non-fault phase feeder line in the power distribution network. By injecting line voltage into the busbar to eliminate the hazards brought by single-phase grounding arc light. When a single-phase grounding fault occurs in the system, based on the characteristic that one of the three-phase voltages to the ground must increase after the fault occurs, the phase with the maximum voltage to the ground is taken as the injection phase, and the selected arc extinction voltage is injected, ultimately making the fault point voltage close to zero to achieve effective arc extinction. The method and device are respectively simulated and verified in the PSCAD simulation environment and a 10kV prototype laboratory. The simulation and experimental results show that the non-fault phase feeder line voltage flexible arc extinction device can quickly and effectively eliminate arc light. In addition, the device connection method is simple, the injection process does not produce overvoltage, and there is no need for grounding transformation during the injection process. The device is cost-effective and more suitable for engineering applications. © 2024 IEEE.

关键词： Power distribution faults

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DEVELOPMENT OF QUENCH ANALYSIS PROGRAM BASED ON ARSAC 29

DEVELOPMENT OF QUENCH ANALYSIS PROGRAM BASED ON ARSAC

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2022 29th International Conference on Nuclear Engineering, ICONE 2022

作者： Zhong, Lei Yu, Hongxing Chen, Deqi Liu, Hanzhou Deng, Jian Wu, Dan Science and Technology on Reactor System Design Technology Laboratory Sichuan Chengdu610041 China Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University Ministry of Education Chongqing400044 China

ISBN: (纸本)9780791886410

ARSAC is a reactor system analysis program independently developed in China. In this paper, a quench analysis module is developed based on ARSAC program. The boiling curve suitable for quench process is established and several classical minimum film boiling temperature and models are implanted. The new program can reflect the influence of minimum film boiling temperature and heat transfer models on the quench process, thus it can be used to estimate the effect of surface oxidation and different cladding materials on the quenching process. The calculation results of the new program are in good agreement with the experimental data, and can better simulate the quench process of fuel element under LOCA. Copyright © 2022 by ASME.

关键词： Heat transfer

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Electrical stimulation for brighter persistent luminescence

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Light(science & Applications) 2024年第8期13卷 1590-1601页

作者： Xilin Ma Yuhua Wang Takatoshi Seto Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology of National Development and Reform CommissionDepartment of Materials ScienceSchool of Materials and EnergyLanzhou UniversityNo.222South Tianshui RoadLanzhouGansu 730000China

An immature understanding of the mechanisms of persistent luminescence(PersL)has hindered the development of new persistent luminescent materials(PersLMs)with increased *** this regard,in-situ direct current(DC)electric field measurements were conducted on a layered structure composed of the SrAl_(2)O_(4):Eu^(2+),Dy^(3+)phosphor,and an *** this study,the photoluminescence(PL)and afterglow properties were investigated with respect to voltage by analyzing the current signal and thermoluminescence(TL)*** intensity of PersL increased due to a novel phenomenon known as“external electric field stimulated enhancement of initial brightness of afterglow”.This dynamic process was illustrated via the use of a rate equation approach,where the electrons trapped by the ultra-shallow trap at 0.022 eV could be transferred through the conduction band during long *** afterglow intensity could reach 0.538 cdm^(-2)at a 6 V electric *** design of an electric field stimulation technique enables the enhancement of the intensity of PersLMs and provides a new perspective for exploring the fundamental mechanics of certain established PersLMs.

关键词： spectroscopy luminescence conduction

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