The development of full-spectrum photocatalysts active in the near-infrared(NIR)region has gained increasing attention for deleterious pollutant removal.The integration of plasmonic metals with semico nductors is an e...The development of full-spectrum photocatalysts active in the near-infrared(NIR)region has gained increasing attention for deleterious pollutant removal.The integration of plasmonic metals with semico nductors is an effective way to widen the light re sponse range of photocatalysts due to the strong light absorption and fast plasmonic energy transfer of the localized surface plasmon resonance(LSPR).In this work,the full-spectrum responsive Bi@SrTiO_(3) was prepared via facile solvothermal chemical reduction.The optimal Bi@SrTiO_(3) achieves exceptional photocatalytic Cr(VI)reduction efficiency and tetracycline degradation,realizing bi-directional promotion effects on redox reaction.According to density functional theory(DFT)simulations,the extraordinary photocatalytic performance is attributed to the tunable builtin electric field(IEF)of the Ohmic contact.The favorable adaptability in real water and high stability of BSTO-25 were proved by experime ntal results.And the po ssible photocatalytic mechanism was proposed based on theoretical calculation and experimental results.Furthermore,the non-toxicity of the BSTO-25 was evaluated by E.coli cultivation,which further proves the feasibility of treating wastewater with BSTO-25.This work provides a new perspective on constructing full-spectrum-driven photocatalysts for applications dealing with environmental remediation.展开更多
There is a large demand for models able to predict the future capacity retention and internal resistance(IR)of Lithium-ion battery cells with as little testing as possible.We provide a data-centric model accurately pr...There is a large demand for models able to predict the future capacity retention and internal resistance(IR)of Lithium-ion battery cells with as little testing as possible.We provide a data-centric model accurately predicting a cell’s entire capacity and IR trajectory from one single cycle of input data.This represents a significant reduction in the amount of input data needed over previous works.Our approach characterises the capacity and IR curve through a small number of key points,which,once predicted and interpolated,describe the full curve.With this approach the remaining useful life is predicted with an 8.6%mean absolute percentage error when the input-cycle is within the first 100 cycles.展开更多
Motivated by the huge practical engineering demand for the fundamental understanding of mechanical characteristics of high-speed railway infrastructure,a fullscale multi-functional test platform for high-speed railway...Motivated by the huge practical engineering demand for the fundamental understanding of mechanical characteristics of high-speed railway infrastructure,a fullscale multi-functional test platform for high-speed railway track–subgrade system is developed in this paper,and its main functions for investigating the mechanical performance of track–subgrade systems are elaborated with three typical experimental examples.Comprising the full-scale subgrade structure and all the five types of track structures adopted in Chinese high-speed railways,namely the CRTS I,the CRTS II and the CRTS III ballastless tracks,the double-block ballastless track and the ballasted track,the test platform is established strictly according to the construction standard of Chinese high-speed railways.Three kinds of effective loading methods are employed,including the real bogie loading,multi-point loading and the impact loading.Various types of sensors are adopted in different components of the five types of track–subgrade systems to measure the displacement,acceleration,pressure,structural strain and deformation,etc.Utilizing this test platform,both dynamic characteristics and long-term performance evolution of high-speed railway track–subgrade systems can be investigated,being able to satisfy the actual demand for large-scale operation of Chinese high-speed railways.As examples,three typical experimental studies are presented to elucidate the comprehensive functionalities of the full-scale multi-functional test platform for exploring the dynamic performance and its long-term evolution of ballastless track systems and for studying the long-term accumulative settlement of the ballasted track–subgrade system in high-speed railways.Some interesting phenomena and meaningful results are captured by the developed test platform,which provide a useful guidance for the scientific operation and maintenance of high-speed railway infrastructure.展开更多
避雷器在其运行寿命过程中会承受多次雷电冲击过电压,其保护性能的变化值得关注。选取110 k V整只氧化锌避雷器作为试验研究对象,开展了多次连续的雷电冲击电流(8/20μs,10 k A)试验,测试了试验过程中避雷器的小电流伏安特性和残压。研...避雷器在其运行寿命过程中会承受多次雷电冲击过电压,其保护性能的变化值得关注。选取110 k V整只氧化锌避雷器作为试验研究对象,开展了多次连续的雷电冲击电流(8/20μs,10 k A)试验,测试了试验过程中避雷器的小电流伏安特性和残压。研究发现了110 k V整只避雷器在多次雷电冲击电流作用下的小电流伏安特性和残压变化规律及发生显著变化时的阈值次数,并解体分析了雷电冲击后避雷器内部电阻片的破坏形式。最后从微观机理上解释了避雷器在多次雷电冲击作用下的老化特征。展开更多
传统的能源系统难以满足不断变化的发电结构及用户用能需求,包含冷、热、电等多能流的综合能源系统(integrated energy system, IES)可以充分发挥多种能量耦合互补优势,促进系统资源的高效利用。为此提出综合考虑经济性和环保性,以系统...传统的能源系统难以满足不断变化的发电结构及用户用能需求,包含冷、热、电等多能流的综合能源系统(integrated energy system, IES)可以充分发挥多种能量耦合互补优势,促进系统资源的高效利用。为此提出综合考虑经济性和环保性,以系统全寿命周期成本最低及一次能源消耗最少为目标,构造IES优化配置模型。首先计及储能的全寿命周期运维,综合考虑储能系统的充放电损耗、容量衰减、荷电状态、能量存储时间、削峰填谷效率等因素,建立计及储能的全寿命周期运维的IES优化配置模型;继而通过算例对比分析所提优化方案与传统方案的优劣性及多目标函数权重的影响。结果表明,所提方法具有削峰填谷、促进分布式能源消纳、改善电能质量、提升供电可靠性的功能和加强IES资源高效利用的优势。展开更多
目的:定量分析9种单一中医体质的体积骨密度(volume bone mineral density,vBMD)及骨代谢指标差异,为骨量异常的临床管理提供参考。方法:纳入45~80周岁的健康体检受试者151例,采集中医体质、vBMD及骨代谢指标,包括骨钙素(osteocalcin,OC...目的:定量分析9种单一中医体质的体积骨密度(volume bone mineral density,vBMD)及骨代谢指标差异,为骨量异常的临床管理提供参考。方法:纳入45~80周岁的健康体检受试者151例,采集中医体质、vBMD及骨代谢指标,包括骨钙素(osteocalcin,OC)、全段甲状旁腺激素(intact parathyroid hormone,iPTH)、25-羟维生素D 3[25-hydroxy vitamin D 3,25-(OH)D 3]、β-胶原降解产物(β-collagen degradation product,β-CTX)、总I型胶原氨基端延长肽(total typeⅠcollagen terminal extension peptide,Total-P1NP)等。使用倾向性评分匹配控制年龄及性别等混杂因素后,观察9种体质不同骨量的分布特点及vBMD、骨代谢指标的定量差异。结果:特禀质组vBMD高于于非特禀质组(P<0.05);平和质组OC、25-(OH)D 3、β-CTX、Total-P1NP低于非平和质组(P<0.05);阴虚质组iPTH低于非阴虚质组(P<0.05),Total-P1NP高于非阴虚质组(P<0.05);阳虚质组Total-P1NP高于非阳虚质组(P<0.05);血瘀质组OC高于非血瘀质组(P<0.05);特禀质组25-(OH)D 3低于非特禀质组(P<0.05)。相关分析显示:年龄与vBMD呈显著负相关(r s=-0.49,P<0.001),与25-(OH)D 3呈显著正相关(r s=0.31,P<0.001)。结论:平和质、阴虚质、阳虚质、血瘀质及特禀质vBMD及骨代谢指标存在定量差异。展开更多
基金Project supported by the National Key Research and Development Program of China(2022YFF1100804)Natural Science Foundation of Xinjiang Uygur Autonomous Region(2022D01C456)+4 种基金Guangdong Basic and Applied Basic Research Foundation(2023A1515011736)Guangdong Province Scientific Research Platform Project(2022ZDZX4046,2023ZDZX4052)Guangdong Province Specialized Scientific Research Fund Projects(20192019B121201004)High Level Talents Introduction Project of"Pearl River Talent Plan"in Guangdong Province(2019CX01L308)Guangdong Province of Young Innovative Talents Program of Colleges and Universities(2022KQNCX077)。
文摘The development of full-spectrum photocatalysts active in the near-infrared(NIR)region has gained increasing attention for deleterious pollutant removal.The integration of plasmonic metals with semico nductors is an effective way to widen the light re sponse range of photocatalysts due to the strong light absorption and fast plasmonic energy transfer of the localized surface plasmon resonance(LSPR).In this work,the full-spectrum responsive Bi@SrTiO_(3) was prepared via facile solvothermal chemical reduction.The optimal Bi@SrTiO_(3) achieves exceptional photocatalytic Cr(VI)reduction efficiency and tetracycline degradation,realizing bi-directional promotion effects on redox reaction.According to density functional theory(DFT)simulations,the extraordinary photocatalytic performance is attributed to the tunable builtin electric field(IEF)of the Ohmic contact.The favorable adaptability in real water and high stability of BSTO-25 were proved by experime ntal results.And the po ssible photocatalytic mechanism was proposed based on theoretical calculation and experimental results.Furthermore,the non-toxicity of the BSTO-25 was evaluated by E.coli cultivation,which further proves the feasibility of treating wastewater with BSTO-25.This work provides a new perspective on constructing full-spectrum-driven photocatalysts for applications dealing with environmental remediation.
基金This project was funded by an industry-academia collaborative grant EPSRC EP/R511687/1 awarded by EPSRC&University of Edin-burgh program Impact Acceleration Account(IAA).G.dos Reis acknowledges support from the Fundaç̃ao para a Cî𝑒ncia e a Tecnologia(Portuguese Foundation for Science and Technology,Por-tugal)through the project UIDB/00297/2020(Centro de Matemática e Aplicaç̃oes CMA/FCT/UNL).
文摘There is a large demand for models able to predict the future capacity retention and internal resistance(IR)of Lithium-ion battery cells with as little testing as possible.We provide a data-centric model accurately predicting a cell’s entire capacity and IR trajectory from one single cycle of input data.This represents a significant reduction in the amount of input data needed over previous works.Our approach characterises the capacity and IR curve through a small number of key points,which,once predicted and interpolated,describe the full curve.With this approach the remaining useful life is predicted with an 8.6%mean absolute percentage error when the input-cycle is within the first 100 cycles.
基金This work was supported by the National Natural Science Foundation of China[Grant Nos.11790283,51978587,51708457]the Program of Introducing Talents of Discipline to Universities(111 Project)[Grant No.B16041].
文摘Motivated by the huge practical engineering demand for the fundamental understanding of mechanical characteristics of high-speed railway infrastructure,a fullscale multi-functional test platform for high-speed railway track–subgrade system is developed in this paper,and its main functions for investigating the mechanical performance of track–subgrade systems are elaborated with three typical experimental examples.Comprising the full-scale subgrade structure and all the five types of track structures adopted in Chinese high-speed railways,namely the CRTS I,the CRTS II and the CRTS III ballastless tracks,the double-block ballastless track and the ballasted track,the test platform is established strictly according to the construction standard of Chinese high-speed railways.Three kinds of effective loading methods are employed,including the real bogie loading,multi-point loading and the impact loading.Various types of sensors are adopted in different components of the five types of track–subgrade systems to measure the displacement,acceleration,pressure,structural strain and deformation,etc.Utilizing this test platform,both dynamic characteristics and long-term performance evolution of high-speed railway track–subgrade systems can be investigated,being able to satisfy the actual demand for large-scale operation of Chinese high-speed railways.As examples,three typical experimental studies are presented to elucidate the comprehensive functionalities of the full-scale multi-functional test platform for exploring the dynamic performance and its long-term evolution of ballastless track systems and for studying the long-term accumulative settlement of the ballasted track–subgrade system in high-speed railways.Some interesting phenomena and meaningful results are captured by the developed test platform,which provide a useful guidance for the scientific operation and maintenance of high-speed railway infrastructure.
文摘避雷器在其运行寿命过程中会承受多次雷电冲击过电压,其保护性能的变化值得关注。选取110 k V整只氧化锌避雷器作为试验研究对象,开展了多次连续的雷电冲击电流(8/20μs,10 k A)试验,测试了试验过程中避雷器的小电流伏安特性和残压。研究发现了110 k V整只避雷器在多次雷电冲击电流作用下的小电流伏安特性和残压变化规律及发生显著变化时的阈值次数,并解体分析了雷电冲击后避雷器内部电阻片的破坏形式。最后从微观机理上解释了避雷器在多次雷电冲击作用下的老化特征。
文摘传统的能源系统难以满足不断变化的发电结构及用户用能需求,包含冷、热、电等多能流的综合能源系统(integrated energy system, IES)可以充分发挥多种能量耦合互补优势,促进系统资源的高效利用。为此提出综合考虑经济性和环保性,以系统全寿命周期成本最低及一次能源消耗最少为目标,构造IES优化配置模型。首先计及储能的全寿命周期运维,综合考虑储能系统的充放电损耗、容量衰减、荷电状态、能量存储时间、削峰填谷效率等因素,建立计及储能的全寿命周期运维的IES优化配置模型;继而通过算例对比分析所提优化方案与传统方案的优劣性及多目标函数权重的影响。结果表明,所提方法具有削峰填谷、促进分布式能源消纳、改善电能质量、提升供电可靠性的功能和加强IES资源高效利用的优势。
