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Nano-Micro Letters 2024年第9期16卷 308-324页

作者： Na Yu Idris Temitope Bello Xi Chen Tong Liu Zheng Li Yufei Song Meng Ni department of building and real estate Research Institute for Sustainable Urban Development(RISUD)and Research Institute for Smart Energy(RISE)The Hong Kong Polytechnic UniversityHung HomKowloonHong KongPeople’s Republic of China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057GuangdongPeople’s Republic of China department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayHong KongPeople’s Republic of China

Reversible protonic ceramic cells(RePCCs)hold promise for efficient energy storage,but their practicality is hindered by a lack of high-performance air electrode ***-Popper perovskite Sr_(3)Fe_(2)O_(7−δ)(SF)exhibits superior proton uptake and rapid ionic conduction,boosting ***,excessive proton uptake during RePCC operation degrades SF’s crystal structure,impacting *** study introduces a novel A/B-sites co-substitution strategy for modifying air electrodes,incorporating Sr-deficiency and Nb-substitution to create Sr_(2.8)Fe_(1.8)Nb_(0.2)O_(7−δ)(D-SFN).Nb stabilizes SF’s crystal,curbing excessive phase formation,and Sr-deficiency boosts oxygen vacancy concentration,optimizing oxygen *** D-SFN electrode demonstrates outstanding activity and durability,achieving a peak power density of 596 mW cm^(−2)in fuel cell mode and a current density of−1.19 A cm^(−2)in electrolysis mode at 1.3 V,650℃,with excellent cycling *** approach holds the potential for advancing robust and efficient air electrodes in RePCCs for renewable energy storage.

关键词： Reversible protonic ceramic cells Air electrode Ruddlesden-Popper perovskite Hydration Oxygen reduction reaction

Rational Design of Ruddlesden–Popper Perovskite Ferrites as Air Electrode for Highly Active and Durable Reversible Protonic Ceramic Cells

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Nano-Micro Letters 2024年第9期 316-332页

作者： Na Yu Idris Temitope Bello Xi Chen Tong Liu Zheng Li Yufei Song Meng Ni department of building and real estate Research Institute for Sustainable Urban Development (RISUD) and Research Institute for Smart Energy(RISE)The Hong Kong Polytechnic University The Hong Kong Polytechnic University Shenzhen Research Institute department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology

Reversible protonic ceramic cells（RePCCs）hold promise for efficient energy storage,but their practicality is hindered by a lack of high-performance air electrode ***–Popper perovskite Sr3Fe2O7-δ（SF） exhibits superior proton uptake and rapid ionic conduction,boosting ***,excessive proton uptake during RePCC operation degrades SF's crystal structure,impacting *** study introduces a novel A/B-sites co-substitution strategy for modifying air electrodes,incorporating Sr-deficiency and Nb-substitution to create Sr2.8Fe1.8Nb0.2O7-δ（D-SFN）.Nb stabilizes SF's crystal,curbing excessive phase formation,and Sr-deficiency boosts oxygen vacancy concentration,optimizing oxygen *** D-SFN electrode demonstrates outstanding activity and durability,achieving a peak power density of 596 mW cm-2in fuel cell mode and a current density of-1.19 A cm-2in electrolysis mode at 1.3 V,650 ℃,with excellent cycling *** approach holds the potential for advancing robust and efficient air electrodes in RePCCs for renewable energy storage.

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How to achieve energy efficiency in buildings without compromising indoor air quality: A case study on enthalpy exchangers

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Science China Technological Sciences 2024年第9期67卷 2648-2658页

作者： LI Hao ZHANG Tao LIU XiaoHua department of building Science Tsinghua University

As a representative heat recovery device, the fixed-plate enthalpy exchanger possesses the advantages of high recovery effectiveness, low pressure drop, and small space occupied. Still, indoor contaminants may transfer to fresh air through the enthalpy exchanger simultaneously, causing cross-contamination risk. However, the cross-contamination risk of the fixed-plate enthalpy exchanger has been under-researched in previous studies. As a result, this study experimentally investigates the energy performance, formaldehyde and ammonia transfer rates of paper-based and membrane-based enthalpy exchangers. The results illustrate that the enthalpy recovery effectiveness of the plate exchangers ranges from 60%–85%. The formaldehyde transfer rate through the exchangers varies from 5%–23%, and the ammonia transfer rate is 0–15%. The high effectiveness and low contaminant transfer rates are conducive to the promising application of the fixed-plate enthalpy exchangers. In addition, the energy reclaimed increases with the increase of the absolute indoor-outdoor enthalpy difference. The formaldehyde and ammonia transfer rates and cross-contamination risk slightly decrease with increasing temperature but significantly increase with increasing humidity. Moreover, the experimental results demonstrate that the contaminant transfer rates through the membranebased exchanger are lower than those of the paper-based exchanger. This study provides a reference for the fixed-plate enthalpy exchanger design in practical applications.

关键词： building energy efficiency enthalpy recovery heat recovery effectiveness cross-contamination

工程管理背景下的无人机巡检路径调度优化（英文）

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Engineering 2024年第5期 223-239页

作者：镇璐杨志远 Gilbert Laporte 伊文范天一 School of Management Shanghai University department of Decision Sciences HEC Montréal School of Management University of Bath department of building and real estate The Hong Kong Polytechnic University

Technological advancements in unmanned aerial vehicles(UAVs) have revolutionized various industries,enabling the widespread adoption of UAV-based solutions. In engineering management, UAV-based inspection has emerged as a highly efficient method for identifying hidden risks in high-risk construction environments, surpassing traditional inspection techniques. building on this foundation, this paper delves into the optimization of UAV inspection routing and scheduling, addressing the complexity introduced by factors such as no-fly zones, monitoring-interval time windows, and multiple monitoring rounds. To tackle this challenging problem, we propose a mixed-integer linear programming(MILP)model that optimizes inspection task assignments, monitoring sequence schedules, and charging decisions. The comprehensive consideration of these factors differentiates our problem from conventional vehicle routing problem(VRP), leading to a mathematically intractable model for commercial solvers in the case of large-scale instances. To overcome this limitation, we design a tailored variable neighborhood search(VNS) metaheuristic, customizing the algorithm to efficiently solve our model. Extensive numerical experiments are conducted to validate the efficacy of our proposed algorithm, demonstrating its scalability for both large-scale and real-scale instances. Sensitivity experiments and a case study based on an actual engineering project are also conducted, providing valuable insights for engineering managers to enhance inspection work efficiency.

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Theoretical and experimental studies of gas preparation system for pressurization and reactive control system of launch vehicle

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Chinese Journal of Aeronautics 2024年第7期37卷 168-177页

作者： Valeriy TRUSHLYAKOV Vladislav URBANSKY Vadim YUDINTSEV department of Aviation and Rocket building Omsk State Technical UniversityOmsk 644050Russia

A new gas preparation system(GasPS-RCS)is proposed to solve two tasks:(A)to heat helium gas for tank pressurization;(B)to prepare gas for the Launch Vehicle(LV)Reactive Control System(RCS)at the LV orientation and stabilization sections of the LV on passive parts of the flight trajectory,to provide conditions for launching the Liquid Rocket Engine(LRE).The system includes a gas generator based on hydrogen peroxide,a separator for water separation,heat exchangers independent of the LRE,and gas-jet *** proposed new system allowed to reduce the length of pressurizing gas lines and reduce the increased helium gas consumption during the heat exchanger warm-up interval of the LRE during its launch.A special advantage of the proposed system is the possibility of ground testing of heat exchangers without an operating LRE.A mathematical model based on the first law of thermodynamics was used to perform a comparative analysis of GasPS-RCS with traditional pressurization and RCS *** validate the mathematical model,the experimental studies of helium pressurizing of a liquid nitrogen tank were *** results show that the deviation of experimental and calculated values for pressure is 1.1%and for temperature up to 2%.According to the results of comparative analysis,the GasPS-RCS is 259 kg lighter for the first stage and 80 kg lighter for the second stage of the LV.

关键词： Engine restart Reactive control system Tank pressurization Cryogenics Hydrogen peroxide Heat exchanger

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Status and progress of metal-supported solid oxide fuel cell: Towards large-scale manufactory and practical applications

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Energy Reviews 2024年第1期3卷 1-23页

作者： Haoran Xu Yu Han Jing Zhu Meng Ni Zhen Yao State Key Laboratory of Clean Energy Utilization Zhejiang University38 Zheda RoadHangzhou310027China department of building and real estate Research Institute for Sustainable Urban Development(RISUD)&Research Institute for Smart Energy(RISE)Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Fakultät für Physik Universität BielefeldUniversitätsstr.2533615BielefeldGermany

Metal-supported solid oxide fuel cells(MS-SOFCs)own advantages of high performance,fast start-up,thermal cycle stability,easy sealing,and reduced material *** recent years,significant progress has been made in the development of MS-SOFCs,particularly with respect to improved electrochemical performance,long-term stability,and industrial *** studies have mainly focused on stainless steel-based MS-SOFCs,with an emphasis on the development of low-temperature preparation processes,antioxidant coatings,stable electrodes,and the direct utilization of hydrocarbon ***,Ceres Power and GE have successfully commercialized MS-SOFCs and have constant cooperated with several institutions and companies,such as Jülich Research Center,Weichai and Cummins,to promote the performance and expand the market of *** ahead,this review paper provides an outlook on future research directions in this rapidly evolving field.

关键词： Metal support Solid oxide fuel cell High performance Long-term stability

Air purifier or fresh air system? A comparison of energy consumption and cost in urban China residential buildings

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Science China Technological Sciences 2024年第9期67卷 2637-2647页

作者： GUO Yong SUN ZhiWei WESCHLER Louise B. ZHANG YinPing department of building Science Tsinghua University Beijing Key Laboratory of Indoor Air Quality Evaluation and Control Independent Researcher

Chinese urban residential buildings face serious indoor air quality problems. Air purification systems(e.g., air purifiers, fresh air systems) that supply fresh air or purify indoor air are widely used in residential buildings to improve indoor air *** the challenges of energy conservation and emission reduction, it is urgent to guide residents on choosing appropriate air purification systems. The key problem is how to identify the best air purification system with the lowest energy consumption or operating cost. Comparisons of air purification systems have rarely been conducted on the premise that they should deliver air such that the main indoor pollutant concentrations all meet air quality standards. Also ignored in comparisons are the increased filtration resistance caused by dust accumulation on the filter and the cost of filter replacement. In this study, we propose a method to compare residential air purification systems based on energy consumption and total cost, and we provide methods to select air purification systems in China's different climatic regions. We used a standard two-person bedroom as the example, and determined the most suitable(minimum cost or energy consumption) air purification systems for the capital cities of the provinces in Chinese mainland.

关键词： IAQ fresh air system air purifier energy consumption cost

Towards an integrated risk analysis security framework according to a systematic analysis of existing proposals

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Frontiers of Computer Science 2024年第3期18卷 199-216页

作者： Antonio SANTOS-OLMO Luis Enrique SÁNCHEZ David G.ROSADO Manuel A.SERRANO Carlos BLANCO Haralambos MOURATIDIS Eduardo FERNÁNDEZ-MEDINA GSyA Research Group University of Castilla-La ManchaCiudad Real 13071Spain Institute for Analytics and Data Science University of EssexColchester CO43SQUK Alarcos Research Group University of Castilla-La ManchaCiudad Real 13071Spain ISTR Research group Department of Computer Science and ElectronicsUniversity of CantabriaSantander 39005Spain

The information society depends increasingly on risk assessment and management systems as means to adequately protect its key information *** availability of these systems is now vital for the protection and evolution of ***,several factors have led to an increasing need for more accurate risk analysis *** are:the speed at which technologies evolve,their global impact and the growing requirement for companies to *** analysis processes must consequently adapt to these new circumstances and new technological *** objective of this paper is,therefore,to present the results of an exhaustive analysis of the techniques and methods offered by the scientific community with the aim of identifying their main weaknesses and providing a new risk assessment and management *** analysis was carried out using the systematic review protocol and found that these proposals do not fully meet these new *** paper also presents a summary of MARISMA,the risk analysis and management framework designed by our research *** basis of our framework is the main existing risk standards and proposals,and it seeks to address the weaknesses found in these *** is in a process of continuous improvement,as is being applied by customers in several European and American *** consists of a risk data management module,a methodology for its systematic application and a tool that automates the process.

关键词： information security management security system security risk assessment and management

Evaluation of the seismic behavior of reinforced concrete structures with flat slab-column gravity frame and shear walls through nonlinear analysis methods

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Earthquake Engineering and Engineering Vibration 2024年第3期23卷 713-726页

作者： M.A.Najafgholipour S.Heidarian Radbakhsh E.Erfani department of Civil and Environmental Engineering Shiraz University of TechnologyShiraz ***Iran department of building Civiland Environmental EngineeringConcordia UniversityMontréal H3G 1M8Canada

This paper presents an investigation of the seismic behavior of reinforced concrete(RC)structures in which shear walls are the main lateral load-resisting elements and the participation of flat slab floor systems is not considered in the seismic design *** this regard,the behavior of six prototype structures(with different heights and plan layouts)is investigated through nonlinear static and time history analyses,implemented in the OpenSees *** results of the analyses are presented in terms of the behavior of the slab-column connections and their mode of failure at different loading ***,the global response of the buildings is discussed in terms of some parameters,such as lateral overstrength due to the gravity flat slab-column *** to the nonlinear static analyses,in structures in which the slab-column connections were designed only for gravity loads,the slab-column connections exhibited a punching mode of failure even in the early stages of ***,the punching failure was eliminated in structures in which a minimum transverse reinforcement recommended in ACI 318(2019)was provided in the slabs at joint ***,despite neglecting the contribution of gravity flat slab-column frames in the lateral load resistance of the structures,a relatively significant overstrength was imposed on the structures by the gravity frames.

关键词： RC flat slab-column frames seismic behavior nonlinear analysis time history analysis

Evaluation of the seismic behavior of reinforced concrete structures with flat slab-column gravity frame and shear walls through nonlinear analysis methods

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Earthquake Engineering and Engineering Vibration 2024年第3期 713-726页

作者： Mohammad Amir Najafgholipour S.Heidarian Radbakhsh E.Erfani department of Civil and Environmental Engineering Shiraz University of Technology department of building Civil and Environmental Engineering Concordia University

This paper presents an investigation of the seismic behavior of reinforced concrete(RC) structures in which shear walls are the main lateral load-resisting elements and the participation of flat slab floor systems is not considered in the seismic design procedure. In this regard, the behavior of six prototype structures(with different heights and plan layouts) is investigated through nonlinear static and time history analyses, implemented in the Open Sees platform. The results of the analyses are presented in terms of the behavior of the slab-column connections and their mode of failure at different loading stages. Moreover, the global response of the buildings is discussed in terms of some parameters, such as lateral overstrength due to the gravity flat slab-column frames. According to the nonlinear static analyses, in structures in which the slab-column connections were designed only for gravity loads, the slab-column connections exhibited a punching mode of failure even in the early stages of loading. However, the punching failure was eliminated in structures in which a minimum transverse reinforcement recommended in ACI 318(2019) was provided in the slabs at joint regions. Furthermore, despite neglecting the contribution of gravity flat slab-column frames in the lateral load resistance of the structures, a relatively significant overstrength was imposed on the structures by the gravity frames.

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