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Possible high COVID-19 airborne infection risk in deep and poorly ventilated 2D street canyons

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Building Simulation 2023年第9期16卷 1617-1628页

作者： Vitor Lavor Omduth Coceal sue Grimmond Jian Hang Zhiwen Luo School of the Built Environment University of ReadingReadingUK Department of Meteorology University of ReadingReadingUK School of Atmospheric Sciences Guangdong Province Key Laboratory for Climate Change and Natural Disaster StudiesSun Yat-sen UniversityGuangzhouChina Welsh School of Architecture Cardiff UniversityCardiffUK

Despite the widespread assumption that outdoor environments provide sufficient ventilation and dilution capacity to mitigate the risk of COVID-19 infection,there is little understanding of airborne infection risk in outdoor urban areas with poor *** address this gap,we propose a modified Wells-Riley model based on the purging flow rate(QPFR),by using computational fluid dynamics(CFD)*** model quantifies the outdoor risk in 2D street canyons with different approaching wind speeds,urban heating patterns and aspect ratios(building height to street width).We show that urban morphology plays a critical role in controlling airborne infectious disease transmission in outdoor environments,especially under calm winds;with deep street canyons(aspect ratio>3)having a similar infection risk as typical indoor *** ground and leeward wall heating could reduce the risk,windward heating(e.g.,windward wall~10 K warmer than the ambient air)can increase the infection risk by up to 75%.Our research highlights the importance of considering outdoor infection risk and the critical role of urban morphology in mitigating airborne infection *** identifying and addressing these risks,we can inform measures that may enhance public health and safety,particularly in densely populated urban environments.

关键词： airborne infection risk street canyon urban ventilation wall heating CFD modelling

Fabrication of C@MoxTi1-xO2-δ nanocrystalline with functionalized interface as efficient and robust PtRu catalyst support for methanol electrooxidation

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Journal of Energy Chemistry 2020年第1期29卷 7-14,I0001页

作者： Jialong Li Lei Zhao Xifei Li sue Hao Zhenbo Wang MIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyNo.92 West-Da Zhi StreetHarbin 150001HeilongjiangChina Institute of Advanced Electrochemical Energy&School of Materials Science and Engineering Xi'an University of TechnologyXi'an 710048ShaanxiChina

A core shell structured C@MoxTi1-xO2-δnanocrystal with a functionalized interface(C@MTNC-FI)was fabricated via the hydrothermal method with subsequent annealing derived from tetrabutyl *** formation of anatase TiO2 was inhibited by the simultaneous presence of the hydrothermal etching/regrowth process,infiltration of Mo dopants and carbon coating,which endows the C@MTNC-FI with an ultrafine crystalline architecture that has a Mo-functionalized interface and carbon-coated *** Ru nanoparticles(NPs)were supported on C@MTNC-FI by employing a microwave-assisted polyol process(MAPP).The obtained Pt Ru/C@MTNC-FI catalyst has 2.68 times higher mass activity towards methanol electrooxidation than that of the un-functionalized catalyst(Pt Ru/C@TNC)and 1.65 times higher mass activity than that of Pt Ru/C catalyst with over 25%increase in *** improved catalytic performance is due to several aspects including ultrafine crystals of TiO2 with abundant grain boundaries,Mofunctionalized interface with enhanced electron interactions,and core shell architecture with excellent electrical transport *** work suggests the potential application of an interface-functionalized crystalline material as a sustainable and clean energy solution.

关键词： Interface functionalization TiO2 Nanocrystalline Mo doping Core–shell PtRu catalyst Methanol electrooxidation

A Web-based system enabling the integration,analysis,and 3D sub-surface visualization of groundwater monitoring data and geological models

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International Journal of Digital Earth 2016年第2期9卷 197-214页

作者： Jane Hunter Charles Brooking Lucy Reading sue Vink School of Information Technology and Electrical Engineering(ITEE) The University of QueenslandBrisbaneQLDAustralia Centre for Water in the Minerals Industry(CWIMI) The University of QueenslandBrisbaneQLDAustralia

The 3D Water Chemistry Atlas is an intuitive,open source,Web-based system that enables the three-dimensional(3D)sub-surface visualization of ground water monitoring data,overlaid on the local geological model(formation and aquifer strata).This paper firstly describes the results of evaluating existing virtual globe technologies,which led to the decision to use the Cesium open source WebGL Virtual Globe and Map Engine as the underlying *** it describes the backend database and search,filtering,browse and analysis tools that were developed to enable users to interactively explore the groundwater monitoring data and interpret it spatially and temporally relative to the local geological formations and aquifers via the Cesium *** result is an integrated 3D visualization system that enables environmental managers and regulators to assess groundwater conditions,identify inconsistencies in the data,manage impacts and risks and make more informed decisions about coal seam gas extraction,waste water extraction,and water reuse.

关键词： 3D sub-surface visualization groundwater geological model

The Ananthakrishna Model Under Non-synchronous Perturbation

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Acta Mathematicae Applicatae Sinica 2024年第4期40卷 1078-1097页

作者： Yi-wen TAO sue Ann CAMPBELL Jing-li REN School of Mathematics and Statistics Zhengzhou UniversityZhengzhou 450001China Department of Applied Mathematics University of WaterlooWaterloo N2L3G1Canada

The Ananthakrishna model,seeking to explain the Portevin-Le Chatelier effect,is studied with or without non-synchronous *** the unperturbed model,Bogdanov-Takens bifurcation and zeroHopf bifurcation are *** the perturbed model,rich dynamical behaviors are given by researching the Poincarémap,including solutions of different periods,quasi-periodic solutions,chaotic solutions,and ***,an augmented temperature-dependent perturbation amplitude induces a transition from non-serrated to serrated flow on the stress-time ***,on the stress-strain curve,the phenomenon of repeated yielding diminishes with an increase in the value of a temperature-dependent parameter,while it persists with an increase in the value of a temperature-independent *** analysis sheds light on the factors exerting the most significant influence on dislocation density.

关键词： Ananthakrishna model serrations non-synchronous perturbation attractor bifurcation

Examining global warming factors using self-organizing map and Granger causality network:a case from South Korea

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Ecological Processes 2023年第1期12卷 140-150页

作者： Thakur Dhakal Tae-Su Kim Do-Hun Lee Gab-sue Jang Department of Life Science Yeungnam UniversityGyeongsan 38541Republic of Korea National Institute of Ecology Seocheon 33657Republic of Korea

Background Understanding and patterning the possible causal variables of global warming is attributed to the development of effective prevention and mitigation strategies for climate ***,we aimed to pattern and visualize the possible causal variables of global warming and measure the causality between *** We patterned and visualized the time series(103 years,from 1918 to 2020)of global surface temperature(GTemp)data with the gross domestic product(GDP)per capita,human population(Pop),and carbon dioxide(CO_(2))emissions of South Korea using a self-organizing map(SOM)and examined the causable local feature of global warming using the Granger causality(GC)*** time-series data were trained and mapped in 4×4 SOM grids,and causality networks between variables were examined using multivariate Granger test *** SOM patterned 103 years of data,and a dominant cluster contained continuous time-series data from 2007 to ***,the CO_(2)emissions of South Korea were obtained as a predictable unidirectional causal variable for GTemp from GC *** on data from the past 34 years,significant causality(p-value=0.01)was observed with the integrated effect of Pop,GDP,and CO_(2)on *** This study patterned the time-series data using SOM and examined the causal relationship between variables using the GC *** study framework could be used as a reference by future scholars,ecologists,and the United Nations Sustainable Development Goals.

关键词： Climate change Ecology Self-organizing map Sustainable development goal Greenhouse gas

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Risk factor analysis for meta plastic gastritis in Koreans

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World Journal of Gastroenterology 2006年第16期12卷 2584-2587页

作者： Soonami Choi Yun Jeong Lim sue Kyung Park Center for Health Promotion Samsung Medical CenterSeoulKorea Department of Internal Medicine Dongguk University International HospitalDongguk University College of MedicineGoyangKorea Department of Preventive Medicine Seoul National University College of MedicineSeoulKorea

AIM： To conduct a retrospective study to determine the risk factors for development of metaplastic gastritis in Korean population. METHODS： The database of 113449 subjects who underwent a gastroscopy for the purpose of a regular check-up at center for health promotion, Samsung medical center during 5 years was collected and retrospectively analyzed. Among them, 5847 subjects who had endoscopically diagnosed as a metaplastic gastritis or 10076 normal as well as answered to questionnaire were included for present study. The subjects were divided into 2 groups; Group Ⅰ, normal and Group Ⅱ, metaplastic gastritis. Age, gender, Helicobacter pylori （H pylori） seropositivity, body mass index （BMI）, family history of cancer, smoking, alcohol consumption, total daily calories, folate and salt intake and dietary habit （out-eating, overeating, irregular eating） were retrieved from questionnaire or electronic medical record and compared between group Ⅰ and group Ⅱ. RESULTS： The prevalence of group Ⅱwas 11% （13578/113449） increasing its prevalence with age （P=0.000）. But, there was no significant association between 2 groups in BMI, family history of cancer, alcohol consumption, total daily calories, folate and salt intake and dietary habit （out-eating, overeating, irregular eating）. Old age （P=0.000）, male gender （P=0.000）, H pylori seropositivity （P= 0.010） and current smoker （P=0.000） were significantly more common in group II at multiple logistic regression model. CONCLUSION： Our data suggested that old age, male gender, H pylori seropositivity and smoking were risk factors for metaplastic gastritis, precancerous lesion of gastric cancer.

关键词： Intestinal metaplasia Risk factors

A novel inexpensive conductive material:Er-modified maifanite by gaseous penetration technology

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Journal of Rare Earths 2019年第3期37卷 329-333页

作者： Liying Qi sue Hao Suisheng Li Tiancheng Sun Xinrong Liu School of Chemistry and Chemical Engineering Harbin Institute of Technology

Aiming to solve the problem of corrosion and high cost of the conductive fillers, the powders with the properties of anti-oxidation, corrosion resistance and thermal stability should be developed. A new modification technology, rare earth gaseous penetration, was applied to enhance the conductivity of maifanite in this paper, and the mechanism for improving the conductivity of maifanite effectively was speculated in detail for the variations of the composition, structure and morphology between the original and Er-penetration maifanite powders. The results of the resistivity show that Er-penetration can really improve the conductivity of maifanite powders. When the penetration temperature is 500 ℃, the resistivity of maifanite surprisingly declines to 93.2 Ω·m. Moreover, XRD and XPS patterns display that the cations in maifanite are substituted by Er^(3+) successfully, resulting in the production of electrons in the system, which is the key reason to heighten the conductivity of maifanite. Most importantly, Erpenetration maifanite, whose price is really low, can replace the expensive conductive powders and be used in the electronic industry to decrease the cost of the electronic devices.

关键词： Ceramics Maifanite Electrical properties Gaseous penetration technology Rare earths

Heterojunction Incorporating Perovskite and Microporous Metal–Organic Framework Nanocrystals for Efficient and Stable Solar Cells

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Nano-Micro Letters 2020年第6期12卷 203-213页

作者： Xuesong Zhou Lele Qiu Ruiqing Fan Jian Zhang sue Hao Yulin Yang MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001People’s Republic of China

In this paper,we present a facile approach to enhance the efficiency and stability of perovskite solar cells(PSCs)by incorporating perovskite with microporous indium-based metal–organic framework[In12O(OH)16(H2O)5(btc)6]n(In-BTC)nanocrystals and forming heterojunction light-harvesting *** interconnected micropores and terminal oxygen sites of In-BTC allow the preferential crystallization of perovskite inside the regular cavities,endowing the derived films with improved morphology/crystallinity and reduced grain boundaries/***,the In-BTC-modified PSC yields enhanced fill factor of 0.79 and power conversion efficiency(PCE)of 20.87%,surpassing the pristine device(0.76 and 19.52%,respectively).More importantly,over 80%of the original PCE is retained after 12 days of exposure to ambient environment(25°C and relative humidity of^65%)without encapsulation,while only about 35%is left to the pristine device.

关键词： Metal–organic framework Nanocrystal Heterojunction Light-harvesting layer Perovskite solar cell

“In Kindy You Don’t Get Taught”: Continuity and Change as Children Start School

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Frontiers of Education in China 2012年第1期7卷 5-32页

作者： sue DOCKETT Bob PERRY Research Institute for Professional Practice Learning and EducationCharles Sturt UniversityAlburyNSW 2640Australia

Over the last decade,there has been increasing awareness of the importance of engaging young children in research about their experiences and considering ways in which children’s experiences,expectations and perceptions influence both their interactions and those of *** has resulted from recognition of young children as active citizens,with rights to be consulted about matters that affect them and from the principles underpinning the sociology of childhood,which emphasizes children’s capabilities and *** paper explores young Australian children’s perceptions of school and learning,as expressed through drawings and conversations about *** from children in preschools and the early years of school highlight children’s expectations and experiences of school,including the importance of play,friendships,children’s dispositions,and academic expectations of school and *** on previous research that notes the long term importance of children’s attitudes and approaches,as well as their sense of belonging and identity,at the start of school,this paper has implications for adults engaging with children as they make the transition to school.

关键词： children’s perspectives transition learning Australia