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CSEE Journal of Power and Energy Systems 2022年第5期8卷 1457-1467页

作者： Ge Chen Biao Yan Hongcai Zhang Dongdong Zhang Yonghua song State Key Laboratory of Internet of Things for Smart City and Department of Electrical and Computer Engineering University of MacaoMacao 999078China

District cooling system(DCS)provides centralized chilled water to multiple buildings for air conditioning with high energy-efficiency and operational *** is one of the most popular cooling systems for large buildings in modern cities and an important demand response source for power *** order to enhance its energy efficiency and utilize its flexibility,strategic operation is ***,finding an optimal policy for DCS operation is a challenging task because of the high inter-connectivity among *** evolution of cooling load uncertainties further increases the *** paper addresses the aforementioned challenges by proposing a novel optimal power dispatch model for *** proposed model optimizes water temperature and mass flow rates simultaneously to improve the energy efficiency as much as *** also explicitly describes the uncertainty accumulation and ***-constrained programming is employed to guarantee the cooling service *** further propose a more timeefficient formulation to overcome the computational intractability caused by the non-smooth and non-convex *** experiments based on a real DCS confirm that a time-efficient formulation can save about half of solution time with negligible cost increase.

关键词： District cooling system HVAC cooling power dispatch demand-side flexibility chance-constrained programming

Comparative study of tribological properties of insulated and conductive polyimide composites

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Friction 2020年第3期8卷 507-516页

作者： Jingfu song Yuanhao YU Gai ZHAO Jinhao QIU Qingjun DING College of Material Science and Technology Narijing Universiy of Aeronautics andAstronauticsNanjing 210016China Slate Key Laboratory of Mechanics and Control of Mechanical Sructures Nanjing University of Aeronauties and AstronauticsNanjing 210016China

Insulated polyimide(PI)composites filled with short glass fibers(SGF),polytetrafluoroethylene(PTFE),SiO2,and polyphenylene(PPL)are specially designed,prepared,and the tribological properties are systematically investigated with references to the special requirements for frictional materials used in ultrasonic *** hardness and thermal decomposition temperature of the insulated PI composites are comparable to that of conductive PI ***,these insulated materials present excellent friction and wear performance,especially under high loads and *** electron microscopy(SEM)analysis of the worn surface indicates that adhesive and fatigue wear dominate the wear mechanisms.

关键词： polyimide composites insulation friction wear

飞秒激光烧蚀硅材料表面形成周期波纹形貌研究

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物理学报 2017年第10期66卷 191-197页

作者：李志明王玺聂劲松电子工程学院脉冲功率激光技术国家重点实验室合肥230037

基于Sipe-Drude模型和表面等离子体激元(SPP)的干涉理论分别对单脉冲飞秒激光诱导硅表面形成低频率周期性波纹进行分析研究.探究了波长800 nm、脉宽150 fs的单个飞秒激光烧蚀硅造成不同激发水平下波纹形貌的变化,考虑到材料的光学性质变... 详细信息

基于Sipe-Drude模型和表面等离子体激元(SPP)的干涉理论分别对单脉冲飞秒激光诱导硅表面形成低频率周期性波纹进行分析研究.探究了波长800 nm、脉宽150 fs的单个飞秒激光烧蚀硅造成不同激发水平下波纹形貌的变化,考虑到材料的光学性质变化(由Drude模型得到的介电常数变化),引入包含双温方程的电子数密度模型.计算结果表明,Sipe-Drude和SPP理论都适用于分析和解释高激发态下周期性波纹,但Sipe-Drude理论更适合分析更为广泛的周期性波纹结构.同时,波纹延伸方向总是垂直于入射激光偏振方向,其空间周期略小于激光波长,并受到入射激光通量的影响.在激光通量为0.38 J/cm^2时,波纹周期达到最小值.另外,还得到了不同入射角度的波纹周期变化情况,并在不同偏振态下随入射角度增大时波纹周期呈现相反的变化趋势.该研究对于理解飞秒激光造成硅表面形成周期结构及其在加工硅材料领域具有重要参考意义.

关键词： Sipe-Drude模型表面等离子体激元低频率周期性波纹双温方程

IL-17A-dependent gut microbiota is essential for regulating diet-induced disorders in mice

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Science Bulletin 2017年第15期62卷 1052-1063页

作者： Yujing Bi Chunxiao Li Lin Liu Jiyuan Zhou Zhengchao Li Huimin Deng Chunyan Wu Yanping Han Yajun song Yafang Tan Xiaoyi Wang Zongmin Du Yujun Cui Yanfeng Yan Fachao zhi Guangwei Liu Nan Qin Heping Zhang Ruifu Yang State Key laboratory of Pathogen and Biosecurity. Beijing Institute of MicrobiologY and Epidemiology Beijing 100071 China Key Laboratory of Cell Proliferation and Regulation Biology Ministry of Education Institute of Cell Biology College of Life Science Beijing Normal University Beijing 100875 China State Key Laboratory for Diagnosis and Treatment of Infectious Disease The First Affiliated Hospital College of Medicine Zhejiang University Hangzhou 310003 China Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases Zhejiang University Hangzhou 310003 China Guangdong Provincial Key Laboratory of Gastroenterology Institute of Gastroenterology of Guangdong Province Department of Gastroenterology Nan fang Hospital Southern Medical University Guangzhou 510515 China Realbio Genomics Institute Shanghai 200050 China Key Laboratory of Dairy Biotechnology and Engineering Education Ministry of China Inner Mongolia Agricultural University Hohhot 010018 China

The gut microbiota plays a key role in obesity and related metabolic disorders, and multiple factors including diet, host genotype, and age regulate it. Many studies have examined the contribution of extrinsic factors to the regulation of the gut microbiota, but the importance of the host genetic constitution cannot be ignored, lnterleukin 17A （lL-17A）, a pro-inflammatory cytokine, is important in the defense against infection and diseases. Here, we investigated the association among IL-17, a high-fat diet （HFD）, and the gut microbiota. Mice deficient in 1L-17A were resistant to diet-induced obesity and related diseases. Compared with the I1-17a^-/1 mice, wild-type （WT） mice challenged with HFD showed obvious weight fluctuations, such as those seen in type 2 diabetes, and hematological changes similar to those associated with metabolic syndrome. However, housing WT mice and Il-17a^-/- mice together signifi- cantly alleviated these symptoms in the WT mice. A metagenomic analysis of the mouse feces indicated that the microbial community compositions of these two groups differed before HFD feeding. The HFD mediated shifts in the gut microbial compositions, which were associated with the mouse phenotypes. We also identified potentially beneficial and harmful species present during this period, and drew net- works of the most abundant species. A functional analysis indicated pathway changes in the WT and I1-17a^- /- mice when fed the HFD. Collectively, these data underscore the importance of the host factor IL-17A in shaping and regulating the gut microbiota, which conversely, influences the host health.

关键词： Gut microbiota Obesity IL-17A Metagenomics

Multi-scale simulation model of air system based on cross-dimensional data transmission method

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Chinese Journal of Aeronautics 2023年第5期36卷 157-174页

作者： Lei WANG Junkui MAO song WEI Longfei WANG Jin PAN AECC Aeroengine Control System Institute Wuxi 214063China College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The Secondary Air System(SAS)plays an important role in the safe operation and performance of *** traditional 1D-3D coupling method loses information when used for secondary air systems,which affects the calculation *** this paper,a Cross-dimensional Data Transmission method(CDT)from 3D to 1D is proposed by introducing flow field uniformity into the data ***,a uniformity index was established to quantify the flow field parameter distribution characteristics,and a uniformity index prediction model based on the locally weighted regression method(Lowess)was established to quickly obtain the flow field ***,an information selection criterion in 3D to 1D data transmission was established based on the Spearman rank correlation coefficient between the uniformity index and the accuracy of coupling calculation,and the calculation method was automatically determined according to the established ***,a modified function was obtained by fitting the ratio of the 3D mass-average parameters to the analytical solution,which are then used to modify the selected parameters at the 1D-3D *** a typical disk cavity air system as an example,the results show that the calculation accuracy of the CDT method is greatly improved by a relative 53.88%compared with the traditional 1D-3D coupling ***,the CDT method achieves a speedup of 2 to 3 orders of magnitude compared to the 3D calculation.

关键词： Air system Data transmission Disk cavity Multi-scale simulation 1D-3D coupling

An Intracellular pH-Actuated Polymer for Robust Cytosolic Protein Delivery

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CCS Chemistry 2021年第12期3卷 431-442页

作者： Wei Xu Feng-Qin Luo Qi-song Tong Jia-Xian Li Wei-Min Miao Yue Zhang Cong-Fei Xu Jin-zhi Du Jun Wang School of Biomedical Sciences and Engineering Guangzhou International CampusSouth China University of TechnologyGuangzhou 511442 School of Medicine South China University of TechnologyGuangzhou 510006 Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education Innovation Center for Tissue Restoration and ReconstructionSouth China University of TechnologyGuangzhou 510006 National Engineering Research Center for Tissue Restoration and Reconstruction Key Laboratory of Biomedical Engineering of Guangdong ProvinceSouth China University of TechnologyGuangzhou 510006 Bioland Laboratory(Guangzhou Regenerative Medicine and Health Guangdong Laboratory) Guangzhou 510005

Robust cytosolic protein delivery requires both efficient protein binding with delivery vehicles and effective protein release after cell *** a variety of stimuli-responsive carriers have been designed,simultaneously integrating these two functions in one versatile carrier is ***,we developed a polyamidoamine(PAMAM)-based polymer with an intracellular pHactuated hydrophobic-to-hydrophilic transition for this purpose.

关键词： cytosolic protein delivery nanoparticle PAMAM pH sensitive

Experimental and numerical studies of Ca(OH)_(2)/CaO dehydration process in a fixed-bed reactor for thermochemical energy storage

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Chinese Journal of Chemical Engineering 2023年第10期62卷 11-20页

作者： zhihao Zhang Danyang song Hengxing Bao Xiang Ling Xiaogang Jin School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 211816China

The Ca(OH)_(2)/CaO thermochemical energy storage(TCES)system based on calcium looping has received extensive attention owing to its high energy storage density,prolonged energy storage time,and environmental *** heat storage process of the Ca(OH)_(2)/CaO TCES system in a mixed heating reactor was evaluated in this study,by employing a combination of direct and indirect heating *** dehydration process was studied experimentally,and a numerical model was established and verified based on the experimental *** dehydration behavior of 500 g of Ca(OH)_(2) powder was investigated in a fixed-bed reactor with mixed *** experimental and simulation results indicated that mixed heating causes combined centripetal and horizontal *** input is the main limiting factor in the heat storage process,because the radial advance of the reaction is hindered by the low thermal conductivity of the solid reactant *** transmission partitions were added to enhance the performance of the *** performance of the modified reactor was compared with that of a conventional *** radial heat transmission partitions in the modified reactor effectively enhance the energy storage rate and reduce the reaction time by 59.5%compared with the reactor without partitions.

关键词： Thermochemical energy storage Reactor Ca(OH)_(2)/CaO Dehydration Experiment research Numerical simulation

Comparison of models to predict air infiltration rate of buildings with different surrounding environments

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Building Simulation 2024年第6期17卷 1007-1021页

作者： Shu Zheng Xiujiao song Lin Duanmu Yu Xue Xudong Yang Department of Building Science Tsinghua UniversityBeijing100084China School of Civil Engineering Dalian University of TechnologyDalian116024China Shanxi Research Institute for Clean Energy Tsinghua UniversityTaiyuan030032China

The air infiltration rate of buildings strongly influences indoor environment and energy *** this study,several traditional methods for determining the air infiltration rate were compared,and their accuracy in different scenarios was ***,a method combining computational flow dynamics(CFD)with the Swami and Chandra(S-C)model was developed to predict the influence of the surrounding environment on the air infiltration *** buildings in Dalian,China,were selected:one with a simple surrounding environment and the other with a complex surrounding environment;their air infiltration rates were *** test results were used to validate the accuracy of the air infiltration rate solution models in different urban *** the building with a simple environment,the difference between the simulation and experimental results was 0.86%–22.52%.For the building with a complex environment,this difference ranged from 17.42%to 159.28%.We found that most traditional models provide accurate results for buildings with simple surrounding and that the simulation results widely vary for buildings with complex *** results of the method of combining CFD with the S-C model were more accurate,and the relative error between the simulation and test results was 10.61%.The results indicate that the environment around the building should be fully considered when calculating the air infiltration *** results of this study can guide the application of methods of determining air infiltration rate.

关键词： air infiltration rate models CFD simulation building surrounding air infiltration rate test

Data and Model Driven Task Offloading Strategy in the Dynamic Mobile Edge Computing System

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Journal of Systems Science & Complexity 2024年第1期37卷 351-368页

作者： DONG Hairong WU Wei song Haifeng LIU Zhen ZHANG Zixuan School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China School of Electronic and Information Engineering BeiHang UniversityBeijing 100191China CRSC Research&Design Institute Group Co. Ltd.Beijing 100070China

Mobile Edge Computing(MEC)provides communication and computational capabilities for the industrial Internet,meeting the demands of latency-sensitive ***,traditional model-driven task offloading strategies face challenges in adapting to situations with unknown network communication status and computational *** limitation becomes notably significant in complex industrial networks of high-speed *** by these considerations,a data and model-driven task offloading problem is proposed in this paper.A redundant communication network is designed to adapt to anomalous channel states when tasks are offloaded to edge *** link switching mechanism is executed by the train according to the attributes of the completed *** task offloading optimization problem is formulated by introducing data-driven prediction of communication states into the traditional ***,the optimal strategy is achieved by employing the informer-based prediction algorithm and the quantum particle swarm optimization method,which effectively tackle real-time optimization problems due to their low time *** simulations illustrate that the data and model-driven task offloading strategy can predict the communication state in advance,thus reducing the cost of the system and improving its robustness.

关键词： Data driven model informer mobile edge computing quantum particle swarm optimization task offloading.

Oxidation of benzene to phenol with N_(2)O over a hierarchical Fe/ZSM-5 catalyst

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Green Energy & Environment 2023年第4期8卷 1161-1173页

作者： Cui Ouyang Jianwei Li Yaqi Qu song Hong songbo He State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China Green Chemical Reaction Engineering Engineering and Technology Institute GroningenUniversity of GroningenNijenborgh 4Groningen9747 AGthe Netherlands CoRe Pro Colijnlaan 21Groningen9722 PJthe Netherlands

Catalytic oxidation of benzene with N_(2)O to phenol over the hierarchical and microporous Fe/ZSM-5-based catalysts in a continuous fixedbed reactor was *** spent catalyst was in-situ regenerated by an oxidative treatment using N_(2)O and in total 10 reaction-regeneration cycles were performed.A 100% N_(2)O conversion,93.3% phenol selectivity,and high initial phenol formation rate of 16.49±0.06mmol_(phenol gcatalyst)^(-1)h^(-1)at time on stream(TOS) of 5 min,and a good phenol productivity of 147.06 mmol_(phenol gcatalyst)^(-1)during catalyst lifetime of 1800 min were obtained on a fresh hierarchical Fe/ZSM-5-Hi2.8 *** the reaction-regeneration cycle,N_(2)O conversion is fully recovered within TOS of 3 h,moreover,the phenol productivity was decreased ca.2.2±0.8% after each cycle,leading to a total phenol productivity of ca.0.44 ton_(pheol kg_(catalyst)^(-1)estimated for 300 *** characterizations imply that the coke is rapidly deposited on catalyst surface in the initial TOS of 3 h(0.28 mgc_(gcatalyst)^(-1)min^(-1)) and gradually becomes graphitic during the TOS of 30 h with a slow formation rate of 0.06 mgc g_(catalyst)^(-1)min^(-1).Among others(e.g.,the decrease of textural property and acidity),the nearly complete coverage of the active Fe-O-Al sites by coke accounts for the main catalyst *** these reversible deactivation characteristics related to coking,the irreversible catalyst deactivation is also observed with the reaction-regeneration *** latter is reflected by a further decreased amount of the active Fe-O-Al sites,which agglomerate on catalyst surface with the cycle,likely associated with the hard coke residue that is not completely removed by the regeneration.

关键词： Hierarchical Fe/ZSM-5 N_(2)O conversion Phenol product productivity Reaction-regeneration cycles Irreversible deactivation mechanism