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Development and application of photocatalytic coating for roadside NO_(x) mitigation in Hong Kong

Chinese Chemical Letters 2024年第3期35卷 153-157页

作者： Xinwei Li Pengge Wang Shuwen Han Yu Huang Wingkei Ho Steven Sai Hang Ho shun-cheng lee Meng Wang Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina State Key Laboratory of Loess and Quaternary Geology(SKLLQG)and Key Laboratory of Aerosol Chemistry and Physics Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China Department of Science and Environmental Studies The Education University of Hong KongHong KongChina Division of Atmospheric Sciences Desert Research InstituteRenoNV 89512United States

A facile chemical method for the development of photocatalytic coating products was proposed based on practical application perspective for the Hong Kong roadside nitrogen oxides(NO_(x))***_(2)-based photocatalytic coating PC-C film with crystallized size of around 5–6 nm was synthesized with the peptization of H_(2)O_(2).The PC-C coating possesses a super-hydrophilicity surface and is proven to have a NO_(x)degradation rate of 46.8%with an optimum pH level of *** addition,the PC-C coating presents a promising photocatalytic NO_(x)degradation compared with other commercially available coating products and P25 when applied on two building materials of poly-methyl methacrylate(PMMA)and concrete surface.A weather resistance simulation and a 180-day on-site field trial were carried out the attenuation effects of photocatalytic coating applied in outdoor *** on epidemiological estimation and field investigation,hospital admissions for respiratory diseases(HARD)and mortality cases(MC)could be reduced with the application of PC-C coating along the street *** work demonstrates the feasibility of air pollution control measures for the local roadside NO_(x)using photocatalytic technology,offering promising health benefits with environmental remediation.

关键词： Photocatalysis Coating NO_(x) mitigation Hong Kong Roadside

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Long-term variation and evaluation of air quality across Hong Kong

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Journal of Environmental Sciences 2023年第5期127卷 284-294页

作者： Yan Tan Shuwen Han Yi Chen Zhongbiao Wu shun-cheng lee School of Environmental and Municipal Engineering Qingdao University of Technology Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Division of Environment and Sustainability The Hong Kong University of Science and Technology Key Laboratory of Environment Remediation and Ecological Health Ministry of Education College of Environmental and Resource Sciences Zhejiang University

Study of Air Quality Objectives (AQOs) and long-term changes of air pollution plays a decisive role in formulating and re?ning pollution control *** this study,10-year variations of six major air pollutants were analyzed at seven monitoring sites in Hong *** continuous decrease of annual averaged concentrations of NO2,SO2,CO,PM2.5and PM10and numbers of days with severe pollution conditions validated the ef?ciency of the series of air pollution control schemes implemented by the Hong Kong ***,there is still a big gap to meet the ultimate targets described by the World Health ***,the concentration of O3at roadside and urban stations increased by 135%±25%and37%±18%from 2011 to 2020,respectively,meanwhile the highest 8 hr averaged O3concentration was observed as 294μg/m3at background station in 2020,which pointed out the increasing ozone pollution in Hong *** was a great decrease in the annual times of air quality health index (AQHI) laying in“high”,“very high”and“serious”categories from2011 to 2020 with the decrease rate of 89.70%,91.30%and 89.74%at roadside stations,and79.03%,95.98%and 72.73%at urban stations,***,the number of days categorized as“high”or above at roadside station was twice more than that in the urban station during the past ten ***,more policies and attentions should be given to the roadside air quality and its adverse health effect to pedestrians on street.

关键词： Long-term variation Roadside Hong Kong air quality Air Quality Objectives (AQO) Air quality health index (AQHI)

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Polyoxometalates‐doped Bi_(2)O_(3–x)/Bi photocatalyst for highly efficient visible‐light photodegradation of tetrabromobisphenol A and removal of NO

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Chinese Journal of Catalysis 2022年第3期43卷 771-781页

作者： Yingnan Zhao Xing Qin Xinyu Zhao Xin Wang Huaqiao Tan Huiying Sun Gang Yan Haiwei Li Wingkei Ho shun‐cheng lee Department of Science and Environmental Studies The Education University of Hong KongHong KongChina Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education Faculty of ChemistryNortheast Normal UniversityChangchun 130024JilinChina College of Material Science and Engineering Jilin Jianzhu UniversityChangchun 130018JilinChina Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina

Bismuth‐based photocatalysts are a class of excellent visible‐light photocatalysts;however,their redox activity is relatively poor and the efficiency of photogenerated carrier separation is low,limiting their development and application in the field of *** address these issues,a series of polyoxometalate PW_(12)O_(40)^(3–)‐doped Bi_(2)O_(3–x)/Bi Schottky photocatalysts PW_(12)@Bi_(2)O_(3–x)/Bi‐n(PBOB‐n,where n is the amount of NaBH4,i.e.,6,12,18,24,and 48 mg)were prepared by a simple electrospinning/calcination/in‐situ NaBH4 reduction *** this composite photocatalyst,the doping of PW_(12) could effectively adjust the electronic structure of Bi_(2)O_(3–x) and improve its redox *** a shallow electron trap,PW_(12) promoted the separation of the photogenerated ***,desirable Schottky junction between the metal Bi nanoparticles and PW_(12)@Bi_(2)O_(3–x) further accelerated the separation of the photogenerated *** synergistic effect of the aforementioned factors endowed PBOB‐n with excellent photocatalytic *** the samples,PBOB‐18 exhibited superior photocatalytic *** visible‐light irradiation,93.7%(20 mg catalyst)of 20 ppm tetrabromobisphenol A(TBBPA,20 mL)was degraded in 60 *** activity was 4.4 times higher than that of Bi_(2)O_(3).PBOB‐18 also exhibited an ultrahigh photocatalytic performance for the removal of *** removal rate(600 ppb)reached 83.3%in 30 min,making it one of the most active Bi‐based ***,the photocatalytic mechanisms of PBOB‐18 for TBBPA and NO have been *** work provides a new direction and reference for the design of low‐cost,efficient,stable,and versatile photocatalysts.

关键词： Bismuth‐based photocatalyst Polyoxometalates Bi Photocatalytic degradation NO removal

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Real-time measurements of PM_(2.5),PM_(10-2.5),and BC in an urban street canyon

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Particuology 2015年第3期13卷 134-140页

作者： Yan cheng shun cheng lee Yuan Gao Long Cui Wenjing Deng Junji Cao Zhenxing Shen Jian Sun Department of Environmental Science and Technology School of Human Settlements and Civil EngineeringXi'an Jiaotong University SKLLQG Institute of Earth and EnvironmentCAS Department of Civil and Environmental Engineering Research Center for Environmental Technology and ManagementThe Hong Kong Polytechnic University Department of Science and Environmental Studies and Centre for Education for Environmental Sustainability The Hong Kong Institute of Education

A continuous dichotomous beta gauge monitor was used to characterize the hourly content of PM2.5, PM10-2.5, and Black Carbon （BC） over a 12-month period in an urban street canyon of Hong Kong. Hourly vehicle counts for nine vehicle classes and meteorological data were also recorded. The average weekly cycles of PM2.5, PM10-2.5, and BC suggested that all species are related to traffic, with high concentrations on workdays and low concentrations over the weekends. PM2.s exhibited two comparable concentrations at 10：00-11：00 （63.4 μg/m3） and 17：00-18：00 （65.0 p.g/m3 ） local time （LT） during workdays, correspond- ing to the hours when the numbers of diesel-fueled and gasoline-fueled vehicles were at their maximum levels： 3179 and 2907 h-1, respectively. BC is emitted mainly by diesel-fueled vehicles and this showed the highest concentration （31.2μg/m3） during the midday period （10：00-11：00 LT） on workdays. A poor correlation was found between PM2.s concentration and wind speed （R= 0.51, P-value 〉 0.001 ）. In contrast, the concentration of PM10-2.s was found to depend upon wind speed and it increased with obvious statistical significance as wind speed increased （R = 0,98, P-value 〈 0.0001 ）.

关键词： PM2.5 PMl0 2.5BCHong KongUrban street canyon

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RELATIVE LEVELS OF INDOOR AND OUTDOOR PARTICLE NUMBER CONCENTRATIONS IN A RESIDENTIAL BUILDING IN XI'AN

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China Particuology 2006年第6期4卷 342-345页

作者： Yanming Kang Ke Zhong shun-cheng lee School of Environmental Science and Engineering Donghua University Shanghai 201620 China Research Center of Urban Environmental Technology and Management Department of Civil and Structural Engineering Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong China

The time series of indoor and outdoor particle number concentrations in a naturally ventilated residential building in Xi＇an were tested simultaneously for 7 days in summer. The relationships between indoor and outdoor concentrations were examined and discussed, and linear regression analysis was employed to correlate the indoor and outdoor concentrations. The diurnal cycles of indoor and outdoor particle concentrations of different particle size ranges all showed positive correlations between indoor and outdoor number concentrations, The I/O ratios of number concentrations varied with the increase of particle size in the range of 0.89 （±0.19） to 0.99 （±0.15）.

关键词： indoor and outdoor particle number concentration I/O ratio linear regression analysis

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Source apportionment of PM2.5 in different Chinese Cities

Source apportionment of PM2.5 in different Chinese Cities

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第八届全国大气细及超细粒子技术研讨会暨PM_(2.5)源谱交流会

作者： shun-cheng lee the Department of Civil and Environmental Engineering at The Hong Kong Polytechnic University

Fine particle(PM2.5) pollution in China becomes worse in the past 10 years and PM2.5 concentration in some mega cities can be reached to 1000 μg/m. Chinese government has noticed this serious problem have launched air quality guideline statement in recent 5 years. Start from 2012, PM2.5 becomes one of the important pollutant need to be release to public. Many researchers and scientists have conducted PM studies, included monitoring and chemical species identification, and investigate the source. In the study, we compared source apportionment studies and selected some mega cities in Beijing-Tianjin-Hebei Region, Yangtze River delta region and Pearl River delta region for examples and discussed their source apportionment on PM pollution.

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Long-term variation and evaluation of air quality across Hong Kong region

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Journal of Environmental Sciences 2023年第5期 284-294页

作者： Yan Tan Shuwen Han Yi Chen Zhongbiao Wu shun-cheng lee School of Environmental and Municipal Engineering Qingdao University of TechnologyQingdao 266520China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong SAR 999077China Division of Environment and Sustainability The Hong Kong University of Science and TechnologyHong Kong SAR 999077China Key Laboratory of Environment Remediation and Ecological Health Ministry of EducationCollege of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China

Study of Air Quality Objectives(AQOs)and long-term changes of air pollution plays a decisive role in formulating and refining pollution control *** this study,10-year variations of six major air pollutants were analyzed at seven monitoring sites in Hong Kong *** continuous decrease of annual averaged concentrations of NO_(2),SO_(2),CO,PM_(2.5)and PM_(10)and numbers of days with severe pollution conditions validated the efficiency of the series of air pollution control schemes implemented by the Hong Kong region ***,there is still a big gap to meet the ultimate targets described by the World Health ***,the concentration of O_(3)at roadside and urban stations increased by 135%±25%and 37%±18%from 2011 to 2020,respectively,meanwhile the highest 8 hr averaged O_(3)concentration was observed as 294μg/m^(3)at background station in 2020,which pointed out the increasing ozone pollution in Hong Kong *** was a great decrease in the annual times of air quality health index(AQHI)laying in“high”,“very high”and“serious”categories from 2011 to 2020 with the decrease rate of 89.70%,91.30%and 89.74%at roadside stations,and 79.03%,95.98%and 72.73%at urban stations,***,the number of days categorized as“high”or above at roadside station was twice more than that in the urban station during the past ten ***,more policies and attentions should be given to the roadside air quality and its adverse health effect to pedestrians on street.

关键词： Long-term variation Roadside Hong Kong region air quality Air Quality Objectives(AQO) Air quality health index(AQHI)

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Deep Transfer Learning Models for Mobile-Based Ocular Disorder Identification on Retinal Images

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Computers, Materials & Continua 2024年第7期80卷 139-161页

作者： Roseline Oluwaseun Ogundokun Joseph Bamidele Awotunde Hakeem Babalola Akande cheng-Chi lee Agbotiname Lucky Imoize Department of Multimedia Engineering Kaunas University of TechnologyKaunas44249Lithuania Department of Computer Science Landmark UniversityOmu Aran251103Nigeria Department of Computer Science Faculty of Information and Communication SciencesUniversity of IlorinIlorin240003Nigeria Department of Telecommunication Science University of IlorinIlorin230003Nigeria Department of Library and Information Science Fu Jen Catholic UniversityNew Taipei City24205TaiwanChina Department of Computer Science and Information Engineering Fintech and Blockchain Research CenterAsia UniversityTaichung City41354TaiwanChina Department of Electrical and Electronics Engineering Faculty of EngineeringUniversity of LagosAkokaLagos100213Nigeria Department of Electrical Engineering and Information Technology Institute of Digital CommunicationRuhr UniversityBochum44801Germany

Mobile technology is developing *** phone technologies have been integrated into the healthcare industry to help medical ***,computer vision models focus on image detection and classification ***2 is a computer vision model that performs well on mobile devices,but it requires cloud services to process biometric image information and provide predictions to *** leads to increased *** biometrics image datasets on mobile devices will make the prediction faster,but mobiles are resource-restricted devices in terms of storage,power,and computational ***,a model that is small in size,efficient,and has good prediction quality for biometrics image classification problems is *** pre-trained CNN(PCNN)MobileNetV2 architecture combined with a Support Vector Machine(SVM)compacts the model representation and reduces the computational cost and memory *** proposed novel approach combines quantized pre-trained CNN(PCNN)MobileNetV2 architecture with a Support Vector Machine(SVM)to represent models efficiently with low computational cost and *** contributions include evaluating three CNN models for ocular disease identification in transfer learning and deep feature plus SVM approaches,showing the superiority of deep features from MobileNetV2 and SVM classification models,comparing traditional methods,exploring six ocular diseases and normal classification with 20,111 images postdata augmentation,and reducing the number of trainable *** model is trained on ocular disorder retinal fundus image datasets according to the severity of six age-related macular degeneration(AMD),one of the most common eye illnesses,Cataract,Diabetes,Glaucoma,Hypertension,andMyopia with one class *** the experiment outcomes,it is observed that the suggested MobileNetV2-SVM model size is *** testing accuracy for MobileNetV2-SVM,InceptionV3,and MobileNetV2 is 90.11%,86.88%,a

关键词： Retinal images ocular disorder deep transfer learning disease identification mobile device

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ATP6AP2,a regulator of LRP6/β-catenin protein trafficking,promotes Wnt/β-catenin signaling and bone formation in a cell type dependent manner

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Bone Research 2024年第2期12卷 453-468页

作者： Lei Xiong Hao-Han Guo Jin-Xiu Pan Xiao Ren Daehoon lee Li Chen Lin Mei Wen-cheng Xiong Department of Neurosciences School of MedicineCase Western Reserve UniversityClevelandOH 44106USA Louis Stoke VA Medical Center ClevelandOH 44106USA

Wnt/β-catenin signaling is critical for various cellular processes in multiple cell types,including osteoblast(OB)differentiation and *** how Wnt/β-catenin signaling is regulated in OBs remain ***6AP2,an accessory subunit of V-ATPase,plays important roles in multiple cell types/organs and multiple signaling ***,little is known whether and how ATP6AP2 in OBs regulates Wnt/β-catenin signaling and bone *** we provide evidence for ATP6AP2 in the OB-lineage cells to promote OB-mediated bone formation and bone homeostasis selectively in the trabecular bone *** knocking out(CKO)ATP6AP2 in the OB-lineage cells(Atp6ap2^(Ocn-Cre))reduced trabecular,but not cortical,bone formation and bone *** and cellular biochemical studies revealed that LRP6 and N-cadherin were reduced in ATP6AP2-KO BMSCs and OBs,but not *** in vitro and in vivo studies revealed impairedβ-catenin signaling in ATP6AP2-KO BMSCs and OBs,but not osteocytes,under both basal and Wnt stimulated conditions,although LRP5 was decreased in ATP6AP2-KO osteocytes,but not *** cell biological studies uncovered that osteoblastic ATP6AP2 is not required for Wnt3a suppression ofβ-catenin phosphorylation,but necessary for LRP6/β-catenin and N-cadherin/β-catenin protein complex distribution at the cell membrane,thus preventing their *** of activeβ-catenin diminished the OB differentiation deficit in ATP6AP2-KO *** together,these results support the view for ATP6AP2 as a critical regulator of both LRP6 and N-cadherin protein trafficking and stability,and thus regulatingβ-catenin levels,demonstrating an un-recognized function of osteoblastic ATP6AP2 in promoting Wnt/LRP6/β-catenin signaling and trabecular bone formation.

关键词： LRP6 impaired organs

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MORPHOLOGY AND ELEMENTAL COMPOSITION OF DUSTFALL PARTICLES INSIDE EMPEROR QIN'S TERRA-COTTA WARRIORS AND HORSES MUSEUM

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China Particuology 2006年第6期4卷 346-351页

作者： Tafeng Hu Xuxiang Li Jungang Dong Bo Rong Zhenxing Shen Junji Cao shun-cheng lee Judith C. Chow John G. Watson Department of Environmental Science and Engineering Xi'an Jiaotong University Xi'an 710049 China SKLLQG Institute of Earth Environment Chinese Academy of Sciences Xi'an 710075 China Emperor Qin's Terra-cotta Warriors and Horses Museum Xi'an 710054 China Research Center of Urban Environmental Technology and Management Department of Civil and Structural Engineering Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong China Division of Atmospheric Sciences Desert Research Institute Nevada System of Higher Education Reno NV USA

Indoor dusffall samples were collected in Pit 1 and Pit 2 of Emperor Qin＇s Terra-cotta Warriors and Horses Museum in Xi＇an, Shaanxi Province, China. The morphological and elemental analysis for long-term （〉10 years） and short-term （～0.5 year） dusffall particles and lacquer pieces on the faces of partly assembled warriors were performed with scanning electron microscopy with energy dispersive X-ray spectrometer （SEM/EDX）. The results showed that the majority of dusffall samples appeared to be composed of mineral dust particles, fly ash, and biological particles with different elemental compositions. Most of the mineral particles had irregular shapes with smooth edges. Small floccules of calcium sulfate were more frequently observed in long-term dusffall samples than in short-term samples, implying a progressive chemical reaction between continuous dusffall particles and atmospheric sulfur dioxide. Crystals of calcium sulfate were also found near pits on both inner and outer surfaces of lacquer pieces, revealing an acid chemical reaction between sulfur dioxide and lacquer material as the cause of the formation of erosion pits and cracks on surface of lacquer pieces.

关键词： indoor dusffall morphology elemental composition SEM/EDX

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