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Who could and should give exercise prescription:Physicians,exercise and health scientists,fitness trainers,or ChatGPT?

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Journal of Sport and Health Science 2024年第3期13卷 368-372页

作者： Weimo Zhu wenguang geng Lingling Huang Xiong Qin Zezhao Chen Hai Yan Yunnan Plateau Thermal Health Industry Innovation Research Institute Tengchong 679100China Department of Kinesiology&Community Health University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Physical Education Nanjing Agricultural UniversityNanjing 210095China School of Sports Engineering Beijing Sport UniversityBeijing 100084China School of Strength and Conditioning Training Beijing Sport UniversityBeijing 100084China

Benefits of exercise for personal health,as well as preventing and treating chronic diseases,have been well documented during the past several decades.1 Exercise prescription is a specialized field that involves assessing an individual’s health status,fitness level,and specific goals to create a tailored exercise program based often on the FITT-VP principle.

关键词： prescription diseases assessing

畜禽养殖污水处理中微波催化氧化法的参数优化

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家畜生态学报 2024年第1期45卷 65-71页

作者：张潇刘芳耿文广王鲁元员冬玲李子淳山东建筑大学热能工程学院山东济南250100 齐鲁工业大学(山东省科学院)能源研究所山东济南250014

该研究拟对微波催化氧化处理畜禽养殖污水技术进行参数优化。以厌氧消化池内的污水为研究对象,分别研究了pH、微波时间、微波功率、催化剂用量、过氧化氢用量5个因素对化学需氧量(COD)去除率的影响;采用响应曲面法中的Box-Behnken试验设... 详细信息

该研究拟对微波催化氧化处理畜禽养殖污水技术进行参数优化。以厌氧消化池内的污水为研究对象,分别研究了pH、微波时间、微波功率、催化剂用量、过氧化氢用量5个因素对化学需氧量(COD)去除率的影响;采用响应曲面法中的Box-Behnken试验设计,以COD去除率为响应值,以微波时间、微波功率、活性炭用量为影响因素,建立数学模型。通过方差分析可知,影响因素显著性顺序为:微波功率>活性炭用量>微波时间,微波功率和微波时间的交互作用对COD去除率影响显著;模型预测的最佳条件组合为:微波时间14.83 min,微波功率320 W,活性炭用量14 g·L^(-1),COD去除率为89.79%,该反应条件下3组平行试验的COD平均去除率为90.27%,与预测值相对误差为0.54%。采用微波催化氧化技术处理畜禽污水,可以满足《畜禽养殖业污染物排放标准》(GB18596)中对COD<100 mg·L^(-1)的一级排放要求。

关键词：微波催化氧化畜禽污水化学需氧量响应曲面法

体育赛事感知视角下城市建设绩效的影响研究:基于南京市的实证

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体育与科学 2022年第6期43卷 86-95+106页

作者：刘勇耿文光翁李胜连云港师范高等专科学校体育学院南京农业大学体育部南京农业大学人文与社会发展学院

体育赛事的举办能够促进主办城市的社会、文化与经济的全面发展。采用结构方程模型法，分析了体育赛事感知对城市建设绩效的影响路径，探讨了城市认同与城市形象在该影响路径中的中介作用。以2019年在南京举办的国际篮联篮球世界杯为例... 详细信息

体育赛事的举办能够促进主办城市的社会、文化与经济的全面发展。采用结构方程模型法，分析了体育赛事感知对城市建设绩效的影响路径，探讨了城市认同与城市形象在该影响路径中的中介作用。以2019年在南京举办的国际篮联篮球世界杯为例，对观看过该体育赛事的南京居民进行线上与线下问卷调查。研究结果表明：体育赛事感知的测量维度包括城市与赛事特色契合度感知、观众对赛事的卷入度感知以及赛事互动性感知三个方面，且三个维度均对城市认同与城市形象具有显著正向影响；城市认同与城市形象对城市建设绩效具有显著正向影响；城市认同与城市形象在体育赛事感知对城市建设绩效的影响中具有完全中介作用。研究结果为体育城市的建设与治理提供了一定的借鉴与参考。

关键词：城市体育城市建设体育赛事感知城市认同城市形象

Structural engineered living materials

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Nano Research 2024年第2期17卷 715-733页

作者： Yang geng Zian Jia Ling Li 635 Prices Fork Road Department of Mechanical EngineeringVirginia Polytechnic Institute and State UniversityBlacksburg VA24061USA

Biological structural materials not only exhibit remarkable mechanical properties but also often embody dynamic characteristics such as environmental responsiveness,autonomy,and self-healing,which are difficult to achieve in conventional engineering *** merging materials science,synthetic biology,and other disciplines,engineered living materials(ELMs)provide a promising solution to combine living organisms with abiotic components,thus facilitating the construction of functional“living”*** natural materials,ELMs possess vitality and hold immense application potential in areas such as medicine,electronics,and construction,captivating increasing research attention *** an emerging branch of ELMs,structural ELMs aim to mimic living biological structural materials by achieving desired mechanical performance while maintaining important“living”*** we summarize the recent progress and provide our perspectives for this emerging research *** first summarize the superiority of structural ELMs by reviewing biological structural materials and biomimetic material design ***,we provide a systematic discussion on the definition and classifications of structural ELMs,their mechanical performance,and physiological ***,we summarize some critical challenges faced by structural ELMs and highlight directions of future *** hope this review article can provide a timely summary of the state of the art and relevant perspectives for future development of structural ELMs.

关键词： structural materials engineered living materials(ELMs) structural ELMs composites mechanical properties

Mixed Dead-time Effect Suppression Strategy for Modular Multilevel Converters

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1075-1084页

作者： Zhi geng Minxiao Han School of Electrical and Electronic Engineering North China Electric Power UniversityBeijing 102206China IEEE

Dead time is necessary for the coupled power switches to prevent shoot-through,especially in the modular multilevel converters(MMCs)with a large number of power *** paper proposes a dead-time effect suppression strategy for MMCs with nearest level *** operational principles of MMCs are first *** to the operational features of MMCs,the method that removes a switching signal from the coupled switches and the reduced switching frequency voltage balancing algorithms(RSFVBAs)are mixed in the proposed *** the intervals that are furthest away from the zerocrossing points(ZCP)of arm currents,the single switching signal method can completely eliminate the dead-time effect(DTE).Alternatively,the DTE is suppressed by the RSFVBA in intervals that are close to the *** the combination of the two methods,the dependence of the DTE suppression method on currents is reduced and the influences of ZCP are also released without degrading the normal operation performance of ***,the output performance of MMCs is improved and the voltage stress on the arm inductor dramatically ***,the validation of the method is verified by the simulation results with the professional tool Matlab/Simulink.

关键词： Dead-time effect modular multilevel converters switching frequency voltage balancing algorithm

Boosting electrocatalytic nitrate reduction to ammonia via Cu_(2)O/Cu(OH)_(2)heterostructures promoting electron transfer

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Nano Research 2024年第6期17卷 4898-4907页

作者： Jing geng Sihan Ji Anhui Province International Research Center on Advanced Building Materials School of Materials Science and Chemical EngineeringAnhui Jianzhu UniversityHefei 230601China Anhui Province Key Laboratory of Advanced Building Materials Anhui Jianzhu UniversityHefei 230601China School of Energy Materials and Chemical Engineering Hefei UniversityHefei 230601China

Electrocatalytic nitrate(NO_(3)^(−))reduction to ammonia(NH_(3))offers a viable approach for sustainable NH_(3)production and environmental ***(Cu)possesses a distinctive electronic structure,which can augment the reaction kinetics of NO_(3)^(−)and impede hydrogen evolution reaction(HER),rendering it a promising contender for the electrosynthesis of NH_(3)from NO_(3)^(−).Nevertheless,the role of Cu_(2)O in copper-based catalysts still requires further investigation for a more comprehensive ***,the Cu_(2)O/Cu(OH)_(2)heterostructures are successfully fabricated through liquid laser irradiation using CuO nanoparticles as a *** and theoretical researches reveal that Cu_(2)O/Cu(OH)_(2)heterostructure exhibits enhanced electrocatalytic performance for NO_(3)^(−)to NH_(3)because Cu(OH)_(2)promotes electron transfer and reduces the valence state of Cu active site in Cu_(2)***−0.6 V(*** hydrogen electrode(RHE)),the NH_(3)yield reaches its maximum at 1630.66±29.72μg·h^(−1)·mgcat^(−1),while the maximum of Faraday efficiency(FE)is 76.95%±5.51%.This study expands the technical scope of copper-based catalyst preparation and enhances the understanding of the electrocatalytic mechanism of NO_(3)^(−)to NH_(3).

关键词： Cu_(2)O/Cu(OH)_(2)heterostructures electron transfer ammonia synthesis electrocatalysts nitrate

Optimizing urban block morphologies for net-zero energy cities:Exploring photovoltaic potential and urban design prototype

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Building Simulation 2024年第4期17卷 607-624页

作者： Xiaotian geng Dong Xie Zhonghua Gou School of Urban Design Wuhan UniversityWuhanChina

The morphology of urban areas plays a crucial role in determining solar potential,which directly affects photovoltaic capacity and the achievement of net-zero *** study focuses on the City of Melbourne to investigate the utilization of solar energy across different urban densities and proposes optimized *** analysis encompasses blocks with diverse population densities,examining medium and high-density *** utilizing a multi-objective genetic optimization approach,the urban morphology of these blocks is *** findings indicate that low-density blocks exhibit photovoltaic potential ranging from 1 to 6.6 times their total energy *** and high-density blocks achieve photovoltaic potential levels approximately equivalent to 40%-85%of their overall energy ***,significant variations in photovoltaic potential are observed among different urban forms within medium and high-density ***“elevated corners with central valley”prototype is proposed as an effective approach,enhancing the overall photovoltaic potential by approximately 14%.This study introduces novel analytical concepts,shedding light on the intricate relationship between urban morphologies and photovoltaic potential.

关键词： net-zero energy solar energy urban density urban morphology multi-objective optimization photovoltaic potential

Improving Network Availability through Optimized Multipath Routing and Incremental Deployment Strategies

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Computers, Materials & Continua 2024年第7期80卷 427-448页

作者： Wei Zhang Haijun geng Computer Application Teaching and Research Section China University of Labor RelationsBeijing100048China School of Automation and Software Engineering Shanxi UniversityTaiyuan030006China

Currently,distributed routing protocols are constrained by offering a single path between any pair of nodes,thereby limiting the potential throughput and overall network *** approach not only restricts the flow of data but also makes the network susceptible to failures in case the primary path is *** contrast,routing protocols that leverage multiple paths within the network offer a more resilient and efficient *** routing,as a fundamental concept,surpasses the limitations of traditional shortest path first *** not only redirects traffic to unused resources,effectively mitigating network congestion,but also ensures load balancing across the *** optimization significantly improves network utilization and boosts the overall performance,making it a widely recognized efficient method for enhancing network *** further strengthen network resilience against failures,we introduce a routing scheme known as Multiple Nodes with at least Two Choices(MNTC).This innovative approach aims to significantly enhance network availability by providing each node with at least two routing *** doing so,it not only reduces the dependency on a single path but also creates redundant paths that can be utilized in case of failures,thereby enhancing the overall resilience of the *** ensure the optimal placement of nodes,we propose three incremental deployment *** algorithms carefully select the most suitable set of nodes for deployment,taking into account various factors such as node connectivity,traffic patterns,and network *** deployingMNTCon a carefully chosen set of nodes,we can significantly enhance network reliability without the need for a complete overhaul of the existing *** have conducted extensive evaluations of MNTC in diverse topological spaces,demonstrating its effectiveness in maintaining high network availability with minimal path *** results are impressive,sh

关键词： Multipath routing network availability incremental deployment schemes genetic algorithm

Multi-physics multi-scale simulation of unique equiaxed-to-columnar-to-equiaxed transition during the whole solidification process of Al-Li alloy laser welding

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Journal of Materials Science & Technology 2024年第4期171卷 235-251页

作者： Chu Han Ping Jiang Shaoning geng Liangyuan Ren School of Mechanical Science and Engineering Huazhong University of Science&Technology(HUST)Wuhan430074China

In this study,a novel multi-physics multi-scale model with the dilute multicomponent phase-field method in three-dimensional(3D)space was developed to investigate the complex microstructure evolu-tion in the molten pool during laser welding of Al-Li *** accurately compute mass data within both two and three-dimensional computational domains,three efficient computing methods,including central processing unit parallel computing,adaptive mesh refinement,and moving-frame algorithm,were *** was placed on the distinctive equiaxed-to-columnar-to-equiaxed transition phenomenon that occurs during the entire solidification process of Al-Li alloy laser *** results indi-cated that the growth distance of columnar grains that epitaxially grew from the base metal(BM)de-creased as the nucleation rate *** the nucleation rate increased,the morphology of the newly formed grains near the fusion boundary(FB)changed from columnar to equiaxed,and newly formed equiaxed grains changed from having high-order dendrites to no obvious dendrite *** the nucleation rate was sufficiently high,non-dendritic equiaxed grains could directly form near the FB,and there was nearly no epitaxial growth from the ***,simulation results illustrated the com-petition among multiple grains with varying orientations that grow in 3D space near the ***,how equiaxed grain bands develop was *** equiaxed band not only hindered the growth of early columnar grains but also some of its grains could grow epitaxially to form new columnar *** predicted results were in good agreement with experimental measurements and observations.

关键词： Laser welding Al-Li alloy Equiaxed-to-columnar-to-equiaxed transition Multi-physics multi-scale model Multicomponent alloys 3D phase-field model