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Numerical simulation of formaldehyde distribution characteristics in the high-speed train cabin

Building Simulation 2024年第2期17卷 285-300页

作者： Fan Wu Hang Dong Chao Yu Hengkui Li qingmin cui Renze Xu Key Laboratory of Traffic Safety on Track Ministry of EducationSchool of Traffic&Transportation EngineeringCentral South UniversityChangshaHunan410075China Joint International Research Laboratory of Key Technologies for Rail Traffic Safety ChangshaHunan410075China National&Local Joint Engineering Research Center of Safety Technology for Rail Vehicle ChangshaHunan410075China School of Software Henan University of EngineeringZhengzhouHenan451191China

The global concern over indoor air pollution in public vehicles has grown *** a focus on enhancing passengers’comfort and health,this study endeavors to investigate the distribution characteristics of formaldehyde within a high-speed train cabin by employing a computational fluid dynamics(CFD)model which is experimentally validated in a real cabin *** research focuses on analyzing the impact of air supply modes,temperature,relative humidity,and fresh air change rate on the distribution and concentration of *** results demonstrate that the difference in average formaldehyde concentration between the two air supply modes is below 1.3%,but the top air supply mode leads to a higher accumulation of formaldehyde near the sidewalls,while the bottom air supply mode promotes a more uniform distribution of ***,the temperature,relative humidity,and fresh air change rate are the primary factors affecting formaldehyde concentration levels,but they have modest effects on formaldehyde’s distribution pattern within the *** the temperature and relative humidity increase,the changes in formaldehyde concentrations in response to variations in these factors become more ***,the formaldehyde concentration may surpass the standard limit of 0.10 mg/m^(3)if the fresh air change rate falls below 212 m^(3)/*** research provides a systematic approach and referenceable results for exploring formaldehyde pollution in high-speed train cabins.

关键词： indoor air pollution formaldehyde CFD simulation high-speed train ventilation

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Quantitative measurement and application of droplets on physical surfaces based on LIF technology

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Transportation Safety and Environment 2024年第2期6卷 104-113页

作者： Fan Wu Shuaixiong Zhou qingmin cui Renze Xu Hengkui Li Chao Yu Key Labor atory of Traffic Safety on Track of Ministry of Education School of Traffic&Transportation EngineeringCentr al South Univ ersityChangsha 410075HunanChina Joint International Research Laboratory of Key Technologies for Rail Traffic Safety School of Traffic&Transportation EngineeringCentral South UniversityChangsha 410075HunanChina School of software Henan University of EngineeringZhengzhou 451191HenanChina National&Local Joint Engineering Research Center of Safety Technology for Rail Vehicle School of Traffic&Transportation EngineeringCentral South UniversityChangsha 410075HunanChina

Contaminated surfaces play a significant role in the transmission of respiratory infectious *** address this issue,we pre-sented a novel quantitative detection method for droplets on physical surfaces,based on the laser-induced fluorescence *** proposed detection method was demonstrated in a realistic high-speed train compartment scenario by simulating the process of droplet release during passengers’breathing and *** experimental results showed that this method could offer high precision(10-1 mg/m^(2))for detecting minute substance concentrations,and its ease of operation makes it suitable for complex en-gineering *** results also revealed that under the combined effects of the indoor airflow and breathing airflow,the range of droplets released by breathing activity exceeded two rows in front of and behind the release ***,we observed that a large number of droplets settled on the seat surfaces on both sides of the same row as the releaser,with over 36%of these droplets concentrated on the backrest area of the *** the respiratory jet velocity increased,the location with the most sed-iment droplets(accounting for 8%of the total sedimentation)occurred on the seat directly in front of the releaser,and approximately 48% of the droplets were found on the back of this *** proposed method overcomes the shortcomings of existing experimental methods in quantitatively capturing the motion characteristics of droplets in complex flow fields.

关键词： quantitative measurement sediment droplets physical surfaces fluorescence measurement high-speed train compart-ment

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基于病毒传播风险的地铁车厢通风系统优化研究

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铁道科学与工程学报 2024年第6期21卷 2241-2251页

作者：伍钒余超徐任泽崔清民李恒奎中南大学交通运输工程学院轨道交通安全教育部重点实验室湖南长沙410075 中南大学轨道交通安全关键技术国际合作联合实验室湖南长沙410075 中南大学轨道交通列车安全保障技术国家地方联合工程研究中心湖南长沙410075 河南工程学院软件学院河南郑州451191

地铁交通系统在提供便利的同时也可能成为病毒传播的温床,优化车厢通风方式是降低病毒传播风险的重要途径。首先,通过数值模拟构建一个典型的集中回风模式地铁车厢模型,并通过实地测量数据验证其准确性。然后,在集中回风模式基础上提出... 详细信息

地铁交通系统在提供便利的同时也可能成为病毒传播的温床,优化车厢通风方式是降低病毒传播风险的重要途径。首先,通过数值模拟构建一个典型的集中回风模式地铁车厢模型,并通过实地测量数据验证其准确性。然后,在集中回风模式基础上提出了一种分散回风模式,与集中回风模式进行对比分析,探讨2种模式下车厢内流场和飞沫扩散特征。最后,结合感染风险评价模型讨论了乘客的感染风险。研究结果显示:在车厢流场和温度场方面,集中回风模式下车厢内15个测点的气流速度和温度均值分别为(0.27±0.13) m/s和(26.4±1.35)℃,分散回风模式下分别为(0.25±0.08) m/s和(26.2±0.94)℃。在飞沫扩散方面,集中回风模式下飞沫受到集中回风口产生的纵向气流影响,在车厢内扩散的区域相比于分散回风模式下更大,集中回风模式下飞沫扩散的区域是分散回风模式下的1.45倍。在乘客感染风险方面,整体上分散回风模式下站姿和坐姿乘客的感染风险都小于集中回风模式下乘客感染风险,且在飞沫释放后的0~20 s内集中回风模式下站姿乘客感染风险是分散回风模式下的1~2倍。相对于集中回风模式,车厢采用分散回风模式可以提高车厢内速度场和温度场的均匀性,并且可以更快地清除乘客呼吸区的飞沫,降低乘客的感染风险。研究结果可为进一步优化地铁车厢通风系统和保障乘客出行安全提供参考。

关键词：地铁车厢回风模式飞沫扩散数值模拟感染风险

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清咳平喘颗粒对COPD急性加重期的临床疗效

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天津医药 2024年第8期52卷 854-857页

作者：李冬生秦艺榕乔曼迟航崔青敏李晓秋天津市南开医院呼吸与危重症医学科 300100

目的探讨清咳平喘颗粒对慢性阻塞性肺疾病急性加重期(AECOPD)患者临床疗效的影响。方法选取80例呼吸科住院治疗的AECOPD患者,其中常规组和联合组各40例,分别于治疗前、治疗第2周末、治疗1个月后观察2组患者自我评估测试(CAT)评分、疗效... 详细信息

目的探讨清咳平喘颗粒对慢性阻塞性肺疾病急性加重期(AECOPD)患者临床疗效的影响。方法选取80例呼吸科住院治疗的AECOPD患者,其中常规组和联合组各40例,分别于治疗前、治疗第2周末、治疗1个月后观察2组患者自我评估测试(CAT)评分、疗效指数、白细胞介素(IL)-6水平、C-反应蛋白(CRP)水平、第1秒用力呼气容积(FEV1)/用力肺活量(FVC)、FEV1占预计值百分比(FEV1%pred)的差异。结果联合组总有效率高于常规组(92.5%vs.75.0%,P0.05)。结论清咳平喘颗粒能有效改善AECOPD患者的临床症状及肺功能,提高生活质量。

关键词：肺疾病,慢性阻塞性痰浊阻肺中西医结合疗法清咳平喘颗粒

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基于动态贝叶斯网络的民航空中停车事件安全风险评估

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中国安全科学学报 2023年第7期33卷 16-23页

作者：陈芳崔庆敏向千秋中国民航大学安全科学与工程学院天津300300 民航机场成都电子工程设计有限责任公司四川成都610041

为探究组织和人的因素对发动机空中停车事件的影响及其演化情况,评估航空公司空停事件的风险水平,基于动态贝叶斯网络(DBN),构建一种适用于民航空停的风险评估模型。首先,运用主动与被动相结合的方式,识别影响发动机发生空停事件的组织... 详细信息

为探究组织和人的因素对发动机空中停车事件的影响及其演化情况,评估航空公司空停事件的风险水平,基于动态贝叶斯网络(DBN),构建一种适用于民航空停的风险评估模型。首先,运用主动与被动相结合的方式,识别影响发动机发生空停事件的组织和人的因素;其次,利用毕达哥拉斯模糊和决策试验与评估实验室(DEMATEL)方法,探究各个风险因素之间的因果关系;然后,基于得到的风险因素因果关系构建民航空停DBN,依据统计分析和专家经验确定民航空停的DBN参数,通过GeNle概率推理,进一步得出空停事件发生的概率;最后,以S航空公司的CFM56-5B发动机为例,评估民航空停事件安全风险。结果表明:2020—2021年,S航空公司的CFM56-5B发动机发生空停事件的概率分别为1.260×10^(-6)、1.352×10^(-6);导致民航空停事件安全风险变化的主要原因是资源投入减少导致教育培训效果降低进而影响作风意识和合作沟通。

关键词：动态贝叶斯网络(DBN) 空中停车(IFSD) 安全风险评估毕达哥拉斯模糊决策试验与评估实验室(DEMATEL)

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Number of Solitons Emerged in the Initial Profile of Shallow Water Using Convolutional Neural Networks

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Journal of Systems Science & Complexity 2024年第2期37卷 463-479页

作者： WANG Zhen cui Shikun School of Mathematical Sciences Dalian University of TechnologyDalian 116024China School of Mathematical Sciences Beihang UniversityBeijing 100191China

The soliton resolution conjecture proposes that the initial value problem can evolve into a dispersion part and a soliton ***,the problem of determining the number of solitons that form in a given initial profile remains unsolved,except for a few specific *** this paper,the authors use the deep learning method to predict the number of solitons in a given initial value of the Korteweg-de Vries(KdV)*** leveraging the analytical relationship between Asech^(2)(x)initial values and the number of solitons,the authors train a Convolutional Neural Network(CNN)that can accurately identify the soliton count from spatio-temporal *** trained neural network is capable of predicting the number of solitons with other given initial values without any additional *** extensive calculations,the authors demonstrate the effectiveness and high performance of the proposed method.

关键词： Convolutional neural network deep learning method KdV equation soliton

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Multi-Sensor Fusion Adaptive Estimation for Nonlinear Under-observed System with Multiplicative Noise

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Chinese Journal of Electronics 2024年第1期33卷 282-292页

作者： Yongpeng cui Xiaojun SUN School of Electronic Engineering Heilongjiang University Key Laboratory of Information Fusion Estimation and Detection

The adaptive fusion estimation problem was studied for the multi-sensor nonlinear under-observed systems with multiplicative noise. A one-step predictor with state update equations was designed for the virtual state with virtual noise first of all. An extended incremental Kalman filter(EIKF) was then proposed for the nonlinear under-observed systems. Furthermore, an adaptive filtering method was given for optimization. The fusion adaptive incremental Kalman filter weighted by scalar was finally proposed. The comparison analysis was made to verify the optimization of the state estimation using adaptive filtering method in the filtering process.

关键词： Adaptive systems Information filters Matrices Adaptive estimation Kalman filters State estimation Nonlinear systems

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日本构建大学主导型创新生态系统的理论、实践与启示

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中国科技论坛 2024年第7期 176-188页

作者：崔健侯庆敏吉林大学东北亚研究院吉林长春130012

在知识经济的社会背景下,构建创新生态系统成为大学提高学术生产力和创新能力的重要战略选择。日本遵循“科学技术创造立国”的战略目标,以知识生产、创新网络、生态系统、价值共创为理论基础,利用政策和不同层次路径的实践来构建大学... 详细信息

在知识经济的社会背景下,构建创新生态系统成为大学提高学术生产力和创新能力的重要战略选择。日本遵循“科学技术创造立国”的战略目标,以知识生产、创新网络、生态系统、价值共创为理论基础,利用政策和不同层次路径的实践来构建大学主导型创新生态系统。通过综合研究型大学的跨学科建设,从知识开发上着重增加知识生产存量,建设大学创新生态系统;以产学研的合作为主要推动手段促进知识的流动性,增加知识流量,建设特定领域创新生态系统;以开放式创新合作基地建设作为价值共创手段,从知识的转化中推进知识生产,建设平台创新生态系统。大学主导型创新生态系统建设为日本带来积极的实践效果,具有可持续性、大规模和整体协调性特征,也有一定的局限性。通过日本的经验总结,为中国构建和优化大学主导型知识生产协同创新生态系统带来启示。

关键词：日本创新生态系统知识生产多重螺旋

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“Buckets effect”in the kinetics of electrocatalytic reactions

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Journal of Energy Chemistry 2024年第2期89卷 388-396,I0010页

作者： Haowen cui Yan-Xia Chen Hefei National Laboratory for Physical Sciences at Microscale Department of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026AnhuiChina

In this study,we systematically investigated the effect of proton concentration on the kinetics of the oxygen reduction reaction(ORR)on Pt(111)in acidic *** results demonstrate a rectangular hyperbolic relationship,i.e.,the ORR current excluding the effect of other variables increases with proton concentration and then tends to a constant *** consider that this is caused by the limitation of ORR kinetics by the trace oxygen concentration in the solution,which determines the upper limit of ORR kinetics.A model of effective concentration is further proposed for rectangular hyperbolic relationships:when the reactant concentration is high enough to reach a critical saturation concentration,the effective reactant concentration will become a constant *** could be due to the limited concentration of a certain reactant for reactions involving more than one reactant or the limited number of active sites available on the *** study provides new insights into the kinetics of electrocatalytic reactions,and it is important for the proper evaluation of catalyst activity and the study of structureperformance relationships.

关键词： Oxygen reduction reaction Kinetics Zero order Rectangular hyperbolic relationship pH effect

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Nano-effect enhanced cooperative luminescence of Yb^(3+) clusters in bulk materials

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Journal of Rare Earths 2024年第3期42卷 473-478,I0002页

作者： Daguang Li Jiahao cui Yanhui Dong Hao cui Dan Zhao Weiping Qin State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun130012China

In order to improve the multi-ion cooperative transition, we proposed and exploited a novel nanoscale effect, namely the nanoshell effect in bulk materials. Based on the effect, an optimal material structure was designed by coating the surfaces of Ca F_(2):Yb^(3+)micron size particles with ZrO_(2). An about 2 times higher intensity of cooperative luminescence is observed upon laser excitation at 980 nm. Dynamical analysis exhibits that the novel effect plays a key role in improving the performance of cooperative transitions. Our results also suggest that the nanoshell effect in bulk materials is likely to be significant in some special cases, which have not been reported yet in the literature.

关键词： Yb^(3+)cluster ZrO_(2) Nanoshell Enhancement Cooperative luminescence Rare earths

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