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Optimal design of building openings to reduce the risk of indoor respiratory epidemic infections

Building Simulation 2022年第5期15卷 871-884页

作者： Yixin Dong li Zhu sui li Martin Wollensak School of Architecture Tianjin UniversityTianjin300072China School of Architecture and Design Hochschule WismarWismar23966Germany APEC Sustainable Energy Center Asia-Pacific Economic Cooperation(APEC)National Energy Administration(NEA)of ChinaTianjin300072China Ecological Planning and Green Building Research Institute Shenyang Jianzhu UniversityShenyang110168China

The design of indoor airflow environments can significantly reduce the risk of respiratory epidemic infections *** studies have successfully developed theoretical models for calculating the effect of airflow fields on infection ***,up until now,studies have primarily focused on simulating and calculating the distribution of viral infection rates in current building *** to the lack of a direct influence model for the design parameters and infection rate calculation,the present studies lack a quantitative analysis of the design *** paper investigates the building openings design approach in a medium-sized kindergarten in Germany,intending to explore passive-based design solutions to improve the building's ability to prevent the virus'*** calculate the infection rate distribution in space by CFD combined with the Wells-Riley *** then,use the Grasshopper platform to build an optimization model with the design parameters of building openings and infection rate values to discuss the relationship between geometric parameters and infection rate *** results show that the building openings'design parameters in transition spaces significantly affect the indoor infection rate under the condition that the input wind speed at the building openings is *** can see that optimizing building openings significantly reduces the average infection rate in *** infection rate in the area with the largest decrease can be reduced by 18.41%.The distribution of infection rate in space is much more uniform,and the excess area is significantly *** study has implications for future research and practice in designing public buildings under the influence of long-standing and cyclical outbreaks of epidemics.

关键词： virus infection rate building openings parameter optimization transition spaces COVID-19 parametric simulation

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Recovery of titania from high titanium slag by roasting method using concentrated sulfuric acid

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Rare Metals 2015年第12期34卷 895-900页

作者： li-li sui Yu-Chun Zhai li-Hua Miao Department of Chemistry Shenyang Medical College School of Materials and Metallurgy Northeastern University

By means of energy-dispersive X-ray spectroscopy (EDX) and scanning electron microscope (SEM) analysis, the phase structure characteristics of high titanium slag were analyzed. Through the single factor and the orthogonal experiment methods, the effects of material particle size, mass ratio of acid to ore, roasting temperature, and roasting time on the acidolysis ratio of TiO2 during the process of roasting high titanium slag with concentrated sulfuric acid were systematically investigated. The results show that the sequence of each factor affecting the acidolysis ratio of TiO2 is: mass ratio of acid to ore, roasting time, and roasting temperature. The optimum technological conditions are obtained as mass ratio of acid to ore of 2.1, roasting temperature of 310°C, roasting time of 75min, and material particle size of 45–53μm. The acidolysis ratio of TiO2 is over 96% under the optimum conditions. The roasting process is proved to be significant in the exploitation and utilization of high titanium slag. The advantages of the proposed roasting process are of high efficiency, low power consumption, and minimum pollution.

关键词： Concentrated sulfuric acid Roasting High titanium slag Titania

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Analysis on hot deformation and following cooling technology of 25Cr2Ni4MoVA steel

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Journal of Iron and Steel Research International 2021年第10期28卷 1305-1314页

作者： Jie Yang Zong-hui Su Feng-li sui School of Metallurgical Engineering Anhui University of TechnologyMa’anshan243032AnhuiChina

The true stress–true strain curves of 25Cr2Ni4MoVA steel were obtained by uniaxial compression experiments at 850–1200℃ in the strain rate range of 0.001–10.0 s^(−1).And the dynamic continuous cooling transformation curves were obtained at the cooling rate range of 0.5–15.0℃ s^(−1) from the austenitization temperature of 1000℃ to the room temperature by pre-strain of 0.2 as *** power dissipation map and the dynamic continuous cooling transformation diagram were constructed based on the data provided by these *** with the optical micrographs of the compressed samples,the full dynamic recrystallization region is located between 1000 and 1200℃ and at the strain rate range from 0.01 to 10.0 s^(−1) with the power dissipation efficiency not less than *** the full dynamic recrystallization region,the power dissipation efficiency increases and the dynamic recrystallization activation energy decreases with the temperature *** the strain rate decreasing,the power dissipation efficiency increases firstly and then starts to decrease as the strain rate is less than 0.1 s^(−1),and dynamic recrystallization activation energy changes on the *** to the dynamic continuous cooling transformation diagram,slow cooling is a better way for the hot-deformed piece with large size or complex shape to avoid cracking as the temperature of the piece is lower than 400℃,and different cooling ways can be used for the hot-deformed piece with small size and simple shapes to obtain certain microstructure and meet good compressive properties.

关键词： 25Cr2Ni4MoVA steel Power dissipation map Dynamic continuous cooling transformation diagram Hot deformation Cooling rate

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The impact of urban morphology on multiple ecological effects:Coupling relationships and collaborative optimization strategies

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Building Simulation 2023年第8期16卷 1539-1557页

作者： Shiwen Zhou Tiemao Shi sui li Yixin Dong Jiayi Sun School of Architecture and Planning Shenyang Jianzhu UniversityShenyangLiaoning 110168China Institute of Spatial Planning and Design Shenyang Jianzhu UniversityShenyangLiaoning 110168China Institute of Ecological Urban Planning and Green Building Shenyang Jianzhu UniversityShenyangLiaoning 110168China School of Architecture Tianjin UniversityTianjin 300072China

Urban morphology significantly affects the ecological effects of urban heat islands,ventilation,and atmospheric ***,we reveal the mechanisms linking the ecological effects of urban morphology to develop a planning approach for the collaborative optimization of multiple ecological *** Shenyang,a cold city in northern China,as the study area,a multiple regression model of morphological parameters and ecological effects was established,and the impact of morphological parameters on ecological effects was *** results show that the aspect ratio of the streets,building density,and vegetation coverage are sensitive to multiple ecological *** inflection point of the ecological effect function curve occurs when the aspect ratio of the building and building density are 0.2 and 0.3,*** addition,for optimal design applications in typical areas of the city,to obtain a Pareto-optimal urban morphology,Grasshopper is used to establish a parametric platform,wherein a genetic algorithm solves the multiple regression equation ***,five ecological effect indicators are optimized and show 8.4%,5.0%,31.6%,33.1%,and 12.5%*** study effectively constructs a collaborative optimization planning and design method for multiple ecological effects.

关键词： urban morphology ecological effect multiple regression parametric design collaborative optimization

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C2 domain of synaptotagmin I associates with lipid rafts of plasma membrane

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Chinese Science Bulletin 2008年第9期53卷 1373-1380页

作者： LU JiHua HE li sui SenFang Department of Biological Sciences & Biotechnology State Key Laboratory of Biomembrane and Membrane Biotechnology TsinghuaUniversity Beijing 100084 China

In this paper we report that the C2 domain of synaptotagmin I (syt I) could associate with lipid rafts of plasma membrane. We demonstrate that phosphatidylinositol 4,5-bisphosphate (PIP2) in the target membrane and Ca2+ are the key factors to enhance the raft association of the C2 domain. We also found that the raft association of the C2 domain could be fulfilled by either C2A or C2B alone, suggesting that their raft association might be complementary. Finally, we indicate that destroying lipid rafts or blocking syt I-raft association could significantly reduce the Ca2+-driven release of glutamates. Our data indicate that the raft association of the C2 domain might play an important role in the regulated exocytosis.

关键词：碳晶体脂质等离子体膜薄

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Application of FEM to Hot Continuous Rolling Process for Inconel 718 Alloy Round Rod

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Journal of Iron and Steel Research International 2009年第5期16卷 43-49页

作者： sui Feng-li CHEN li-qing liU Xiang-hua XU li-xia School of Materials Science and Engineering Anhui University of Technology Ma'anshan 243002 Anhui China The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Fushun Special Steel Co Ltd Fushun 113001 Liaoning China

A finite element model for coupled thermo-meehanical analysis has been developed in hot continuous rolling process for Inconel 718 alloy round rod with diameter of 45 mm. The stability of this alloy is discussed by integration of FEM and processing map reported in literatures. The result shows that the stability of Inconel 718 alloy is analyzed effectively during that process and good stability appears as the initial temperature is 960 ℃ and the initial velocity is from 0. 15 to 0.45 m · s^-1 or the initial temperature is 980 ℃ and the initial velocity is from 0. 15 to 0. 25 m · s^-1.

关键词： hot continuous rolling elastic-plastic FEM coupled thermo-mechanical analysis processing map Inconel 718

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Modeling of strain-inducedγ→α′phase transformation for 201Cu metastable austenitic stainless steel and its verification in rolling processes

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Journal of Iron and Steel Research International 2024年第9期31卷 2248-2254页

作者： li-xia Xu Long-hui Zhou Hong-yun Bi E Chang Feng-li sui School of Innovation Education and School of Metallurgical Engineering Anhui University of TechnologyMa’anshan243032AnhuiChina State Key Laboratory of Development and Application Technology of Automotive Steels(Baowu Steel Group) Shanghai201900China

To model the strain-inducedγ→α′phase transformation for the Cr-Mn metastable austenitic stainless steel,the 201Cu steel was chosen as the analytical material and the cylindrical samples of this steel with size ofϕ5 mm×10 mm were compressed at strains of 0.2–0.6 in the temperature range of 25–150℃ and in the strain rate range of 0.1–5.0 s^(−1).The flaky samples were prepared by wire cutting from the cylindrical samples and the volume fraction of the strain-inducedα′phase was detected in the test point of the flaky *** volume fraction changing with the process parameters was modeled,and the critical temperatures and the critical strains to preventγ→α′phase transformation were calculated as other different process parameters *** linear fitting goodness of the model between the calculated volume fraction values and the tested ones is 0.986 and the validity of the model was verified by application in cold and warm rolling experiments.

关键词： Modeling Volume fraction Strain-inducedα′phase 201Cu steel Cylindrical compression experiment

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A FRAMEWORK FOR AUTOMATED CHANGE DETECTION SYSTEM

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Geo-Spatial Information Science 2001年第3期4卷 29-34页

作者： sui Haigang li Deren liESMARS Wuhan University

To enhance the ability of remote sensing system to provide accurate,timely,and complete geo_spatial information at regional or global scale,an automated change detection system has been and will continue to be one of the important and challenging problems in remote *** this paper,the authors propose a framework for automated change detection system at landscape level using various geo_spatial data sources including multi_sensor remotely sensed imagery and ancillary data *** this framework,database is the central part and some associated techniques are *** techniques includes five subsystems:automated feature_based image registration,automated change finding,automated change feature extraction and identification,intelligent change recognition,change accuracy assessment and database updating and visualization.

关键词： change detection difference image change vector

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Analysis on Shear Deformation for High Manganese Austenite Steel during Hot Asymmetrical Rolling Process Using Finite Element Method

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Journal of Iron and Steel Research International 2015年第11期22卷 990-995页

作者： Feng-li sui Xin WANG Jun ZHAO Biao MA Chang-sheng li School of Metallurgical Engineering Anhui University of Technology The 4th Steel Rolling Plant Ma’anshan Iron & Steel Group State Key Laboratory of Rolling and Automation Northeastern University

Based on the rigid-plastic finite element method（FEM）, the shear stress field of deformation region for high manganese austenite steel during hot asymmetrical rolling process was analyzed. The influences of rolling parameters, such as the velocity ratio of upper to lower rolls, the initial temperature of workpiece and the reduction rate, on the shear deformation of three nodes in the upper, center and lower layers were discussed. As the rolling parameters change, distinct shear deformation appears in the upper and lower layers, but the shear deformation in the center layer appears only when the velocity ratio is more than 1.00, and the absolute value of the shear stress in this layer is changed with rolling parameters. A mathematical model which reflected the change of the maximal absolute shear stress for the center layer was established, by which the maximal absolute shear stress for the center layer can be easily calculated and the appropriate rolling technology can be designed.

关键词： high manganese austenite steel hot asymmetrical rolling shear deformation finite element method

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Cross-layer resource allocation in wireless multi-hop networks with outdated channel state information

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第5期15卷 337-350页

作者： Wei FENG sui-li FENG Yue-hua DING Xin HUANG School of Electronic and Information Engineering South China University of Technology School of Physics and Telecommunication Engineering South China Normal University

The cross-layer resource allocation problem in wireless multi-hop networks(WMHNs)has been extensively studied in the past few *** of these studies assume that every node has the perfect channel state information(CSI)of other *** practical settings,however,the networks are generally dynamic and CSI usually becomes outdated when it is used,due to the time-variant channel and feedback *** deal with this issue,we study the cross-layer resource allocation problem in dynamic WMHNs with outdated CSI under channel conditions where there is correlation between the outdated CSI and current *** major contributions are made in this work:(1)a closed-form expression of conditional average capacity is derived under the signal-to-interferenceplus-noise ratio(SINR)model;(2)a joint optimization problem of congestion control,power control,and channel allocation in the context of outdated CSI is formulated and solved in both centralized and distributed *** results show that the network utility can be improved significantly using our proposed algorithm.

关键词： Wireless multi-hop networks Outdated channel state information Cross-layer resource allocation Distributed algorithm

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