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Using air curtains to reduce short-range infection risk in consulting ward: A numerical investigation

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Building Simulation 2021年第2期14卷 325-335页

作者： Jin Ye Hua Qian jianchao ma Rong Zhou Xiaohong Zheng School of Energy and Environment Southeast UniversityNanjing210096China Engineering Research Center of BEEE Ministry of Education of ChinaNanjing210096China First Affiliated Hospital of Guangzhou Medical University Guangzhou510000China Guangzhou Angel Biosafety Co. LtdGuangzhou510000China Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology Nanjing210096China

Air curtains is promising in reducing the short-range infection risk in *** quantitatively evaluate its performance,this paper explores air curtains equipped on normal consulting desk to avoid doctor’s direct exposure to the patient exhaled pollutants.A numerical investigation is conducted to evaluate the effects of supply air velocity and angle on cutting off *** results show that the average mass fraction of exhaled pollutants decreases significantly(70%–90%)in the consulting ward,indicating satisfying performance of air *** supply air velocity is demonstrated to be conducive in forming full air curtains,whereas an excessively high supply air velocity may be of adverse effects by entraining exhaled ***,the supply air angle is also critical due to its coupling with supply air *** is found that larger angle(0°–40°)is better where velocity is less than 3 m/s,otherwise a small angle(20°)is preferable where velocity is larger than 3 m/*** flow could be well suppressed at the supply air angle 20°but moves over air curtains at 40°.This study can provide effective and intuitive guidance in applying air curtains in consulting wards.

关键词： air curtains consulting ward cutting off performance numerical investigation

Investigation of maS structure and intelligent^(+) information processing mechanism of hypersonic target detection and recognition system

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Journal of Systems Engineering and Electronics 2020年第6期31卷 1105-1115页

作者： WU Xia LI Yan SUN Yongjian CHEN Alei CHEN Jianwen ma jianchao CHEN Hao Radar Sergeant School Air Force Early-Warning AcademyWuhan 430019China

The hypersonic target detection and recognition system is studied,on the basis of overall planning and design,a multi-agent system(maS)structure and intelligent+information processing mechanism based on target detection and recognition are proposed,and the multi-agent operation process is analyzed and designed in *** the specific agents construction,the information fusion technology is introduced to defining the embedded agents and their interrelations in the system structure,and the intelligent processing ability of complex and uncertain problems is emphatically analyzed from the aspects of autonomy and *** aim is to optimize the information processing strategy of the hypersonic target detection and recognition system and improve the robustness and rapidity of the system.

关键词： hypersonic target detection recognition intelligent information fusion multi-agent system(maS)

The assessment of personal exposure in restaurants considering heat sources and ventilation strategies

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Energy and Built Environment 2024年第5期5卷 657-664页

作者： Yilin Xie Zhen Ding jianchao ma Xiaohong Zheng Fan Liu Yuqing Ding Zhiyong Shu Hua Qian School of Energy and Environment Southeast UniversityNanjingJiangsu 210096China Department of Environment and Health Jiangsu Provincial Center for Disease Control and PreventionNanjing 210009China School of Environment and Architecture University of Shanghai for Science and TechnologyShanghai 200093China

Outbreaks of airborne infections during meal consumption in diverse restaurant settings have been extensively *** is widely recognized that effective ventilation strategies are essential to minimize the infection risk in indoor environments,and these strategies should be tailored to the heat *** purpose of this study is to compare the spatial distribution of risk in restaurant rooms that use mixing or displacement ventilation,specif-ically focusing on the heat sources used for different food types,namely hotpot,normal Chinese food,and iced *** Fluid Dynamics(CFD)was employed to assess exposure *** results indicate that the use of low-temperature heat sources can elevate the risk of infection by increasing the local vertical temperature *** comparison to no heat source,the risk increased by 190.9%and 99.6%for displacement and mixing ventilation strategies,*** mixing ventilation,both low-temperature and no heat sources showed lower infection risks when compared to displacement ***,displacement ventilation is found to be highly effective in reducing the risk of infection when using a high-temperature heat source,with only 12.3%of the infection risk observed in mixing ***,the use of displacement ventilation resulted in a significant reduction in the odors emitted by hotpot,which were instead absorbed by clothes in the mixing ven-tilation *** findings provide crucial insights into the development of appropriate ventilation strategies for reducing personal exposure to airborne infections in diverse restaurant ***,we recommend using displacement ventilation in restaurants that utilize high-temperature heat sources,as it can substantially reduce the risk of infection.

关键词： Heat source Building ventilation Airborne transmission Respiratory tract infections

Parallel evolution of twoAIM24 protein subfamilies and their conserved functions in ER stress tolerance in land plants

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Plant Communications 2023年第3期4卷 183-196页

作者： Yanlong Guan Guanxiao Chang Jinjie Zhao Qia Wang Jiali Qin Mengmeng Tang Shuanghua Wang Lan ma jianchao ma Guiling Sun Yun Zhou Jinling Huang Key Laboratory for Plant Diversity and Biogeography of East Asia Yunnan Key Laboratory for Fungal Diversity and Green DevelopmentKunming Institute of BotanyChinese Academy of SciencesKunming 650201China State Key Laboratory of Crop Stress Adaptation and Improvement School of Life SciencesHenan UniversityKaifeng 475004China Yunnan Key Laboratory for Wild Plant Resources Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China Department of Biology East Carolina UniversityGreenvilleNC 27858USA

Despite decades of efforts in genome sequencing and functional characterization,some important protein families remain poorly *** this study,we report the classification,evolution,and functions of the largely uncharacterized AIM24 protein family in plants,including the identification of a novel *** show that two AIM24 subfamilies(AIM24-A and AIM24-B)are commonly distributed in major plant *** two subfamilies not only have modest sequence similarities and different gene structures but also are of independent bacterial *** performed comparative functional investigations on the two AIM24 subfamilies using three model plants:the moss Physcomitrium patens,the liverwort marchantia polymorpha,and the flowering plant Arabidopsis ***,despite their significant differences in sequence and gene structure,both AIM24 subfamilies are involved in ER stress tolerance and the unfolded protein response(UPR).In addition,transformation of the AIM24-A gene from *** into the AIM24-B null mutant of *** could at least partially rescue ER stress tolerance and the *** also discuss the role of AIM24 genes in plant development and other cellular *** study provides a unique example of parallel evolution in molecular functions and can serve as a foundation for further investigation of the AIM24 family in plants.

关键词： Physcomitrium marchantia unfolded protein response lncRNA

major episodes of horizontal gene transfer drove the evolution of land plants

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Molecular Plant 2022年第5期15卷 857-871页

作者： jianchao ma Shuanghua Wang Xiaojing Zhu Guiling Sun Guanxiao Chang Linhong Li Xiangyang Hu Shouzhou Zhang Yun Zhou Chun-Peng Song Jinling Huang State Key Laboratory of Crop Stress Adaptation and Improvement School of Life SciencesHenan UniversityKaifeng 475004China Key Laboratory for Plant Diversity and Biogeography of East Asia Yunnan Key Laboratory for Fungal Diversity and Green DevelopmentKunming Institute of BotanyChinese Academy of SciencesKunming 650201China Department of Entomology China Agricultural UniversityBeijing 100193China Shanghai Key Laboratory of Bio-Energy Crops School of Life SciencesShanghai UniversityShanghai 200444China Fairy Lake Botanical Garden Shenzhen&Chinese Academy of SciencesShenzhen 518004China Department of Biology East Carolina UniversityGreenvilleNC 27858USA

How horizontal gene transfer(HGT)has contributed to the evolution of animals and plants remains a major *** recent progress,defining the overall scale and pattern of HGT events in land plants has been largely *** this study,we performed systematic analyses for acquired genes in different plant groups and throughout land plant *** found that relatively recent HGT events occurred in char-ophytes and all major land plant groups,but their frequency declined rapidly in seed *** major ep-isodes of HGT events occurred in land plant evolution,corresponding to the early evolution of strepto-phytes and the origin of land plants,***,a vast majority of the genes acquired in the two episodes have been retained in descendant groups,affecting numerous activities and processes of land *** analyzed some of the acquired genes involved in stress responses,ion and metabolite transport,growth and development,and specialized metabolism,and further assessed the cumulative ef-fects of HGT in land plants.

关键词： plant evolution adaptation streptophytes cumulative effect stress response growth and development

Dynamic culture of a thermosensitive collagen hydrogel as an extracellular matrix improves the construction of tissue-engineered peripheral nerve

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Neural Regeneration Research 2014年第14期9卷 1371-1378页

作者： Lanfeng Huang Rui Li Wanguo Liu Jin Dai Zhenwu Du Xiaonan Wang jianchao ma Jinsong Zhao Department of Joint Surgery Orthopedics Hospital of the Second Hospital of Jilin University Centre of Hand & Foot Surgery and Reparative & Reconstructive Surgery Orthopedics Hospital of the Second Hospital of Jilin University Department of Orthopedics Surgery the Third Hospital of Jilin University Institute of Orthopedics the Second Hospital of Jilin University Department of Ophthalmology the Second Hospital of Jilin University

Tissue engineering technologies offer new treatment strategies for the repair of peripheral nerve injury, hut cell loss between seeding and adhesion to the scaffold remains inevitable. A thermosensitive collagen hydrogel was used as an extracellular matrix in this study and combined with bone marrow mesenchymal stem cells to construct tissue-engineered peripheral nerve composites in vitro. Dynamic culture was performed at an oscillating frequency of 0.5 Hz and 35° swing angle above and below the horizontal plane. The results demonstrated that bone marrow mesenchymal stem cells formed membrane-like structures around the poly-L-lactic acid scaffolds and exhibited regular alignment on the composite surface. Collagen was used to fill in the pores, and seeded cells adhered onto the poly-L-lactic acid fibers. The DNA content of the bone marrow mesenchymal stem cells was higher in the composites constructed with a thermosensitive collagen hydrogel compared with that in collagen I scaffold controls. The cellular DNA content was also higher in the thermosensitive collagen hydrogel composites constructed with the thermosensitive collagen hydrogel in dynamic culture than that in static culture. These results indicate that tissue-engineered composites formed with thermosensitive collagen hydrogel in dynamic culture can maintain larger numbers of seeded cells by avoiding cell loss during the initial adhe-sion stage. Moreover, seeded cells were distributed throughout the material.

关键词： nerve regeneration peripheral nerve biomaterials extracellular matrix tissueengineering nerve scaffold bone marrow mesenchymal stem cells thermosensitive collagen hydrogel poly-L-lactic acid dynamic culture NSFC grant neural regeneration

熔体过热对AISI 304不锈钢亚快速凝固薄带组织的影响

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金属学报 2007年第8期43卷 879-882页

作者：马建超杨院生童文辉中国科学院金属研究所沈阳110016

采用水冷铜模薄带铸造方法研究了熔体过热对AISI 304不锈钢亚快速凝固薄带组织的影响.结果表明:AISI 304不锈钢亚快速凝固薄带由外层的胞状奥氏体组织、次外层的柱状铁素体枝晶组织和中心的等轴铁素体枝晶组织组成;随着熔体过热度增加,... 详细信息

采用水冷铜模薄带铸造方法研究了熔体过热对AISI 304不锈钢亚快速凝固薄带组织的影响.结果表明:AISI 304不锈钢亚快速凝固薄带由外层的胞状奥氏体组织、次外层的柱状铁素体枝晶组织和中心的等轴铁素体枝晶组织组成;随着熔体过热度增加,奥氏体胞晶间距和柱状铁素体二次枝晶间距随之增加,残余铁素体含量亦降低.过热度的增加降低了熔体过冷度和冷却速率,造成薄带凝固组织中枝晶间距的增加和残余铁素体含量的降低.

关键词：不锈钢过热枝晶间距残余铁素体

Fe_(3)O_(4)@SPC类芬顿氧化降解苯酚

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精细化工 2022年第6期39卷 1242-1249页

作者：任凯文王雨昕马建超太原理工大学矿业工程学院山西太原030024

以钙基蒙脱石(Ca-MMT)为原料,采用一步层间模板法制备了Fe_(3)O_(4)@硅柱撑蒙脱石催化剂(Fe_(3)O_(4)@SPC)。通过XRD、FTIR、BET、SEM、TEM对其结构、形貌进行了表征,以苯酚为目标降解污染物,考察了Fe_(3)O_(4)@SPC的催化活性和稳定性,... 详细信息

以钙基蒙脱石(Ca-MMT)为原料,采用一步层间模板法制备了Fe_(3)O_(4)@硅柱撑蒙脱石催化剂(Fe_(3)O_(4)@SPC)。通过XRD、FTIR、BET、SEM、TEM对其结构、形貌进行了表征,以苯酚为目标降解污染物,考察了Fe_(3)O_(4)@SPC的催化活性和稳定性,并推测了苯酚可能的降解路径。结果显示,Fe_(3)O_(4)@SPC晶面间距(d;)为3.30 nm,介孔平均孔径为4.47 nm,Fe_(3)O_(4)粒子主要分散在SPC的外表面。在苯酚质量浓度为0.10 g/L的100 m L溶液中,pH为2.5,催化剂质量浓度为0.5 g/L,H_(3)O_(4)投加量为0.20 m L,反应时间为120 min的最优条件下,苯酚的去除率为100%;催化剂经过5次循环使用后,苯酚的降解率仍保持在91.80%。通过GC-MS分析苯酚降解生成的中间体,结合叔丁醇猝灭实验发现,·OH氧化在非均相类芬顿催化氧化降解苯酚体系中起主导作用。

关键词：钙基蒙脱石 Fe_(3)O_(4)类芬顿氧化苯酚降解机理水处理技术

某机械加工车间三种类置换通风系统的通风性能

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制冷学报 2021年第6期42卷 90-96页

作者：曹进缪建晖麻建超何平上海海立集团股份有限公司上海201206 安徽海立精密铸造有限公司马鞍山238100 东南大学能源与环境学院南京210096

本文采用计算流体动力学(CFD)方法模拟某机械加工车间三种类置换通风系统(中横向送上回、下横向送上回、下竖向送上回)对细颗粒物(PM2.5)的移除能力。现场实测验证了模拟准确性。结果表明:三种类置换通风系统会形成污染物分层现象,车间... 详细信息

本文采用计算流体动力学(CFD)方法模拟某机械加工车间三种类置换通风系统(中横向送上回、下横向送上回、下竖向送上回)对细颗粒物(PM2.5)的移除能力。现场实测验证了模拟准确性。结果表明:三种类置换通风系统会形成污染物分层现象,车间下部工人呼吸区的污染物质量浓度低于车间上部的污染物质量浓度;通过降低排风口高度可以使车间人员活动区污染物降低26.3%~70%;下竖向送上回的通风形式对细颗粒物控制效果更好,排污效率更高且不易造成吹风感,更适用于工业厂房的通风。

关键词：工业厂房类置换通风污染物分层排污效率