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Building Simulation 2024年第4期17卷 525-542页

作者： Fusuo Xu Dongdong Tian Zhi Gao jianshun jensen zhang Department of Mechanical and Aerospace Engineering Syracuse UniversitySyracuseNY13210USA School of Architecture and Urban Planning Nanjing University22 Hankou RoadNanjingJiangsu Province210093China

Building surface cool materials are novel materials that can reduce urban heat island intensity and decrease building energy *** study investigated the impact of radiative properties of materials,façade orientation,and morphological parameters on energy consumption in six typical residential neighborhoods in Nanjing,*** neighborhood energy consumption of 16 application schemes considering the façade orientation factor is compared to determine the best energy-saving *** and annual energy-saving rates,savings in electricity costs,and the price ceiling for materials per unit area are *** results show that for low-rise buildings,using cool materials only on the roof can reduce the annual energy consumption by 1%.When cool or super cool materials are also used on the building façade,the annual energy saving rate can be up to 3.4%and 4.3%,*** cool materials on the south façade of buildings is not recommended due to significant heat loss in *** savings in electricity costs and the price ceiling for materials per unit area,the price of cool and super cool materials should be less than 3.0 and 3.7 RMB/m2,respectively,assuming a lifespan of eight years in Nanjing.

关键词： cool materials building energy saving neighborhood morphology façade orientation

Nationwide evaluation of energy and indoor air quality predictive control and impact on infection risk for cooling season

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Building Simulation 2023年第2期16卷 205-223页

作者： Xuezheng Wang Bing Dong jianshun(jensen)zhang Department of Mechanical and Aerospace Engineering Syracuse UniversitySyracuseNY 13244USA

Since the coronavirus disease 2019,the extended time indoors makes people more concerned about indoor air quality,while the increased ventilation in seeks of reducing infection probability has increased the energy usage from heating,ventilation,and air-conditioning *** this study,to represent the dynamics of indoor temperature and air quality,a coupled grey-box model is *** model is identified and validated using a data-driven approach and real-time measured data of a campus *** manage building energy usage and indoor air quality,a model predictive control strategy is proposed and *** simulation study demonstrated 18.92%energy saving while maintaining good indoor air quality at the testing *** nationwide simulation studies assessed the overall energy saving potential and the impact on the infection probability of the proposed strategy in different climate *** results showed 20%–40%energy saving in general while maintaining a predetermined indoor air quality *** the infection risk is increased due to the reduced ventilation rate,it is still less than the suggested threshold(2%)in general.

关键词： model predictive control indoor air quality infection risk energy-saving large-scale simulation

Mechanistic modeling of copper corrosions in data center environments

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Building Simulation 2024年第3期17卷 483-492页

作者： Rui zhang jianshun zhang Roger Schmidt Jeremy L.Gilbert Department of Mechanical and Aerospace Engineering College of Engineering and Computer ScienceSyracuse UniversitySyracuseNY13244USA Buildings and Transportation Science Division Oak Ridge National LaboratoryOak RidgeTN37830USA SyracuseCoE-New York Center of Excellence in Environmental and Energy Systems Syracuse University727 E.Washington StreetSyracuseNY13244USA Department of Bioengineering Clemson UniversityClemson-Medical University of South Carolina Bioengineering ProgramCharlestonSC29425USA

Air-side economizers are increasingly used to take advantage of“free-cooling”in data centers with the intent of reducing the carbon footprint of ***,they can introduce outdoor pollutants to indoor environment of data centers and cause corrosion damage to the information technology *** evaluate the reliability of information technology equipment under various thermal and air-pollution conditions,a mechanistic model based on multi-ion transport and chemical reactions was *** model was used to predict Cu corrosion caused by Cl_(2)-containing pollutant *** also accounted for the effects of temperature(25℃and 28℃),relative humidity(50%,75%,and 95%),and *** also identified higher air temperature as a corrosion barrier and higher relative humidity as a corrosion accelerator,which agreed well with the experimental *** average root mean square error of the prediction was 13.7Å.The model can be used to evaluate the thermal guideline for data centers design and operation when Cl_(2)is present based on pre-established acceptable risk of corrosion in data centers’environment.

关键词： chloride pollutant mixture copper corrosion model data center temperature relative humidity synergistic effect

Electroactivity of the magnetotactic bacteria Magnetospirillum magneticum AMB-1 and Magnetospirillum gryphiswaldense MSR-1

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Frontiers of Environmental Science & Engineering 2024年第4期18卷 103-110页

作者： Mathias Fessler Qingxian Su Marlene Mark jensen Yifeng zhang Department of Environmental and Resource Engineering Technical University of DenmarkCopenhagenDK-2800Denmark

Magnetotactic bacteria reside in sediments and stratified water *** are named after their ability to synthesize internal magnetic particles that allow them to align and swim along the Earth’s magnetic field ***,we show that two magnetotactic species,Magnetospirillum magneticum strain AMB-1 and Magnetospirillum gryphiswaldense strain MSR-1,are *** *** and *** were able to generate current in microbial fuel cells with maximum power densities of 27 and 11μW/m^(2),*** the presence of the electron shuttle resazurin both species were able to reduce the crystalline iron oxide hematite(Fe_(2)O_(3)).In addition,*** could reduce poorly crystalline iron oxide(FeOOH).Our study adds *** and *** to the growing list of known electroactive bacteria,and implies that electroactivity might be common for bacteria within the Magnetospirillum genus.

关键词： Magnetotactic bacteria Magnetospirillum magneticum Magnetospirillum gryphiswaldense Extracellular electron transfer Microbial fuel cells

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采用元学习的弱监督视频异常检测方法

重庆理工大学学报（自然科学） 2024年第4期38卷 243-249页

作者：张红民栾小虎粟建顺颜鼎鼎重庆理工大学两江国际学院重庆401135 重庆理工大学电气与电子工程学院重庆400054

针对现有弱监督类异常检测方法只考虑准确性而忽略对未知场景的泛化能力,导致模型转移到新场景时性能不佳的问题,提出了一种基于元学习的弱监督视频异常检测方法。该方法的核心思想是通过元学习训练一个自适应模型,通过设计多个任务使... 详细信息

针对现有弱监督类异常检测方法只考虑准确性而忽略对未知场景的泛化能力,导致模型转移到新场景时性能不佳的问题,提出了一种基于元学习的弱监督视频异常检测方法。该方法的核心思想是通过元学习训练一个自适应模型,通过设计多个任务使模型快速适应新的场景。构建了一个两阶段的视频异常检测框架。在内循环阶段,通过减少任务内部损失函数提高基础检测器的检测精度;在外循环阶段,使模型适应不同任务,提高模型的内部表示能力,使其易于在新的场景中快速微调。所提出方法可在不降低已有模型准确性的前提下提高模型对未知场景的泛化能力,大幅减少模型转移新场景时的迭代次数与训练时间。在UCF-Crime数据集、XD-Violence数据集和UCSD Ped2数据集上的实验结果表明,新方法的训练迭代轮数分别降低到105、125和135。

关键词：视频异常检测元学习弱监督学习

近千年气候环境快速变化的长江中游石笋δ^(13)C记录

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沉积学报 2024年第3期42卷 956-969页

作者：柳静张伟宏徐昊邵庆丰卢海欣李茂霞陈剑舜浙江师范大学地理与环境科学学院浙江金华321004 南京师范大学地理科学学院南京210023

【目的】研究亚洲季风区中世纪气候异常期(Medieval Climate Anomaly,MCA)和小冰期(Little Ice Age,LIA)的生态水文过程及其两个阶段的转变特征,有助于进一步理解区域水文生态环境变化与季风气候之间的联系。【方法】基于长江中游湖北... 详细信息

【目的】研究亚洲季风区中世纪气候异常期(Medieval Climate Anomaly,MCA)和小冰期(Little Ice Age,LIA)的生态水文过程及其两个阶段的转变特征,有助于进一步理解区域水文生态环境变化与季风气候之间的联系。【方法】基于长江中游湖北省永兴洞两支高分辨率石笋的δ^(13)C记录,采用ISCAM(Intra-Site Correlation Age Modelling)程序对这两条记录进行客观拼接,重建了该地区1 044~1 954 A.D.期间局域地表水文环境的变化历史。【结果】δ^(13)C在MCA和LIA时期表现为完全不同的两个状态,δ^(13)C在MCA整体减小,而在LIA整体增大。此变化特征与西南以及长江中游地区众多石笋δ^(13)C一致,表明MCA到LIA局域地表植被呼吸活动和降水发生了从强到弱的转变。永兴洞δ^(13)C显示由MCA向LIA的转变过程迅速,Rampfit方法分析得出此转变过程发生在1 434~1 460 A.D.,持续时间为26年。永兴洞记录支持MCA向LIA的转变可能由气候变化和人类活动共同影响所致的认识。通过与其他记录对比,发现永兴洞δ^(13)C与太阳总辐射量、热带辐合带、我国东部温度、厄尔尼诺—南方涛动在MCA和LIA事件尺度上存在对应关系,表明过去千年长江中游地表生态水文环境和全球气候变化有着动力联系;人类活动对地表植被的影响可能与区域或全球气候变化的背景相关联。【结论】通过对过去千年永兴洞石笋δ^(13)C序列的研究,发现MCA与LIA的生态水文特征差异显著,其变化可能与全球气候变化和人类活动有关。该研究不仅清晰地确立了MCA与LIA在长江中游地区的时间界限,而且加深了对过去千年长江中游地区两个时期的生态水文环境变化特征及其原因的理解。

关键词：石笋碳同位素地表植被转变小冰期

A probabilistic-based method to evaluate hygrothermal performance of an internally insulated brick wall

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Building Simulation 2021年第2期14卷 283-299页

作者： Jianhua Zhao jianshun zhang John Grunewald Shuo Feng Institute of Architectural Technology&Science School of ArchitectureTianjin UniversityTianjinChina College of Mechanical&Aerospace Engineering Syracuse UniversitySyracuseUSA Institute of Building Climatology School of ArchitectureTechnische Universität DresdenDresdenGermany Qinhuangdao Municipal Bureau of Foreign Affairs and Commerce QinhuangdaoChina

Uncertainty exists in many aspects of building simulation.A deterministic hygrothermal analysis may not sufficiently give a reliable guidance if a number of input variables are subject to *** this paper,a probabilistic-based method was developed to evaluate the hygrothermal performance of building *** approach accounts for the uncertainties from model inputs and propagates them to the outputs through the simulation model,thus it provides a likelihood of performance *** hypercube sampling technique,incorporated with correlation structure among the inputs,was applied to generate the random samples that follows the intrinsic *** performance of an internally insulated masonry wall was evaluated by applying the proposed approach against different *** performance,condensation and mould growth potential of the renovated wall can overall satisfy the requirements stipulated in multifold *** most influential inputs were identified by the standardized regression sensitivity analysis and partial correlation *** methods deliver the same key parameters for the single and time-dependent output variables in the case *** probabilistic method can provide a comprehensive risk analysis and support the decision-maker and engineer in the design and optimization of building components.

关键词： probabilistic approach hygrothermal performance building component uncertainty analysis sensitivity analysis

Green Design Studio: A modular-based approach for high-performance building design

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Building Simulation 2021年第2期14卷 241-268页

作者： Jialei Shen Bess Krietemeyer Amber Bartosh Zhi Gao jianshun zhang Department of Mechanical and Aerospace Engineering Syracuse University263 Link HallSyracuseNY13244USA School of Architecture Syracuse UniversitySlocum HallSyracuseNY13244USA School of Architecture and Urban Planning Nanjing University22 Hankou RoadNanjingJiangsu Province210093China

A modular-based Green Design Studio(GDS)platform has been developed in this study for fast and accurate performance analysis for early stage green building *** GDS platform aims to simplify the design and analysis process by embedding performance parameters into design elements in modules and employing near-real-time model for whole building performance simulation as well as by providing an easy-to-use and intuitive user interface to assist users without extensive knowledge on building *** platform consists of building modules as fundamental building blocks,performance predicting models,and a user interface for visualization and interactive *** the platform,a whole building is composed of modules organized in a hierarchical structure,including spaces,enclosures,service systems,sustainable resource systems and *** physics-based and data-driven models can be used to simulate the building performance and optimize building systems.A simplified physics-based model,the Resistance–Capacitance(RC)model,has been proposed as a generic simulation model for the flows of heat,air,moisture and pollutants,which is significantly faster than conventional simulation tools such as EnergyPlus,and hence more practical for use in real-time design interaction and optimization.A pilot case study is conducted to illustrate the modular-based design approach using a section of an office *** to conventional building performance analysis tools,the GDS platform can provide fast and reliable feedback on performance prediction for early *** modular approach makes it easier to modify the building design and evaluate the potentials and contributions of various green design features and technologies.

关键词： modular-based building design building performance green building high-performance building building simulation energy efficiency

Non-Hermitian topological coupler for elastic waves

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Science China(Physics,Mechanics & Astronomy) 2022年第2期65卷 57-65页

作者： Yan Meng Xiaoxiao Wu Yaxi Shen Dong Liu Zixian Liang Xiang zhang jensen Li Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China Department of Physics The Hong Kong University of Science and TechnologyClear Water BayHong Kong 999077China Faculties of Sciences and Engineering The University of Hong KongHong Kong 999077China

Non-Hermitian topological systems,by combining the advantages of topological robustness and sensitivity induced by nonHermiticity,have recently emerged and attracted much research ***,we propose a device based on the topological coupler in elastic waves with non-Hermiticity,which contains two topological domain walls and four *** this device,topological robustness routes the transmission of waves,while non-Hermiticity controls the gain or loss of waves as they *** mechanisms result in continuous and quantitative control of the energy distribution ratio of each port.A nonHermitian Hamiltonian is introduced to reveal the coupling mechanism of the topological coupler,and a scattering matrix is proposed to predict the energy distribution ratio of each *** proposed topological coupler,which provides a new paradigm for the non-Hermitian topological systems,can be employed as a sensitive beam splitter or a coupler ***,the topological coupler has potential applications in information processing and logic operation in elastic circuits or networks,and the paradigm also applies to other classical systems.

关键词： topological edge states non-Hermitian systems topological coupler

Combined Heat, Air, Moisture and Pollutant Simulations (CHAMPS) research for building and urban energy efficiency and environmental quality analysis

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Building Simulation 2021年第2期14卷 237-239页

作者： Zhi Gao Weihui Liang Shanshan Shi jianshun zhang School of Architecture and Urban Planning Nanjing University22 Hankou RoadNanjingJiangsu Province210093China Department of Mechanical and Aerospace Engineering Syracuse University263 Link HallSyracuseNY13244USA

The energy and environmental performance of buildings and communities depends on how the heat,air,moisture and pollutant flows are managed and controlled in the *** Heat,Air,Moisture and Pollutant Simulations(CHAMPS)research and development is vital to the optimal design and operation of building and urban energy and environmental systems.

关键词： Simulation moisture (CH