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A New Model Using Multiple Feature Clustering and Neural Networks for Forecasting Hourly PM2.5 Article

Hui Liu, Zhihao Long, Zhu Duan, Huipeng Shi

Engineering 2020, Volume 6, Issue 8,   Pages 944-956 doi: 10.1016/j.eng.2020.05.009

Abstract:

Particulate matter with an aerodynamic diameter no greater than 2.5 μm (PM2.5) concentrationdecomposition (MCD)–echo state network (ESN)–particle swarm optimization (PSO), for multi-step PMThe clustered results of the PM2.5 concentration series are decomposed into several sublayersReal PM2.5 concentration data from four cities located in different zones in China are utilizedindicate that the proposed forecasting model is suitable for the multi-step high-precision forecasting of PM

Keywords： PM2.52.5浓度预测     PM2.52.5浓度聚类     经验小波分解     多步预测    

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A Hybrid Neural Network Model for Marine Dissolved Oxygen Concentrations Time-Series Forecasting Based on Multi-Factor Analysis and a Multi-Model Ensemble Article

Hui Liu, Rui Yang, Zhu Duan, Haiping Wu

Engineering 2021, Volume 7, Issue 12,   Pages 1751-1765 doi: 10.1016/j.eng.2020.10.023

Abstract:

Dissolved oxygen (DO) is an important indicator of aquaculture, and its accurate forecasting can effectively improve the quality of aquatic products. In this paper, a new DO hybrid forecasting model is proposed that includes three stages: multi-factor analysis, adaptive decomposition, and an optimization-based ensemble. First, considering the complex factors affecting DO, the grey relational (GR) degree method is used to screen out the environmental factors most closely related to DO. The consideration of multiple factors makes model fusion more effective. Second, the series of DO, water temperature, salinity, and oxygen saturation are decomposed adaptively into sub-series by means of the empirical wavelet transform (EWT) method. Then, five benchmark models are utilized to forecast the sub-series of EWT decomposition. The ensemble weights of these five sub-forecasting models are calculated by particle swarm optimization and gravitational search algorithm (PSOGSA). Finally, a multi-factor ensemble model for DO is obtained by weighted allocation. The performance of the proposed model is verified by time-series data collected by the pacific islands ocean observing system (PacIOOS) from the WQB04 station at Hilo. The evaluation indicators involved in the experiment include the nash-sutcliffe efficiency (NSE), kling-gupta efficiency (KGE), mean absolute percent error (MAPE), standard deviation of error (SDE), and coefficient of determination (R2). Example analysis demonstrates that: ① the proposed model can obtain excellent DO forecasting results; ② the proposed model is superior to other comparison models; and ③ the forecasting model can be used to analyze the trend of DO and enable managers to make better management decisions.

Keywords： Dissolved oxygen concentrations forecasting     Time-series multi-step forecasting     Multi-factor analysis     Empirical wavelet transform decomposition     Multi-model optimization ensemble    

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Diverse bacterial populations of PM in urban and suburb Shanghai, China

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 3, doi: 10.1007/s11783-020-1329-7

Abstract:

• Urban aerosols harbour diverse bacterial communities in Shanghai.

Keywords： PM2.5     Bacteria     16S rRNA     SEM analysis     Shanghai City    

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Temporal and spatial stability of the EM/PM molecular subtypes in adult diffuse glioma

Frontiers of Medicine 2023, Volume 17, Issue 2,   Pages 240-262 doi: 10.1007/s11684-022-0936-z

Abstract: After identifying conserved gene modules co-expressed with EGFR or PDGFRA (EM or PM), we recently proposedan EM/PM classification scheme for adult gliomas in a histological subtype- and grade-independent mannersamples, and clinical samples, we here demonstrate the temporal and spatial stability of the EM and PMThe EM and PM subtypes, which progress in a subtype-specific mode, are robustly maintained in pairedWithin individual gliomas, the EM/PM subtype was preserved across regions and single cells.

Keywords： glioma progression     molecular classification     EM/PM subtyping     intratumor heterogeneity    

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Temporal variation of PM-associated health effects in Shijiazhuang, Hebei

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 5, doi: 10.1007/s11783-020-1376-0

Abstract:

•Annual mean PM2.5 in Shijiazhuang were 87, 95, and 82 µg

Keywords： PM2.5     Health effects     Integrated exposure-response model     Shijiazhuang    

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The Potential Role of Powdery Mildew-Resistance Gene Pm40 in Chinese Wheat-Breeding Programs inthe Post-Pm21 Era Perspective

Shengwen Tang,Yuting Hu,Shengfu Zhong,Peigao Luo

Engineering 2018, Volume 4, Issue 4,   Pages 500-506 doi: 10.1016/j.eng.2018.06.004

Abstract: Powdery mildew-resistance (Pm) gene Pm21 was first transferred into wheat in the 1980sRecently, new Bgt isolates that are virulent to Pm21 have been identified in some wheat fieldsPm40 offers a broad spectrum of resistance to Bgt, which suggests that it is likelyafter Pm21 resistance is overcome by Bgt isolates.In addition, both Pm21 and Pm40 were derived from alien species, suggesting that the

Keywords： Wheat     Powdery mildew     Pm21     Pm40     Alien species     Native resistance    

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Local and regional contributions to PM in the Beijing 2022 Winter Olympics infrastructure areas during

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 6, doi: 10.1007/s11783-021-1434-2

Abstract:

• Regional transportation contributed more than local emissions during haze episodes.

Keywords： 2022 Winter Olympics     PM2.5     Source apportionment    

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PM2.5 over North China based on MODIS AOD and effect of meteorological elements during 2003‒2015

Youfang Chen, Yimin Zhou, Xinyi Zhao

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 2, doi: 10.1007/s11783-019-1202-8

Abstract: There were one high value center for PM2.5 pollution and two low value centers.In 2004, 2009 and after 2013, PM2.5 concentration was relatively low.making it unfavorable for the prediction and prevention of PM2.5 pollutions.The tempo-spatial characteristics of PM2.5 and the influence of meteorological elements on PM2.5 is discussedAlthough, in 2004, 2009 and dates after 2013, PM2.5 concentrations were relatively low.

Keywords： Aerosol optical depth     PM2.5     MODIS     Mixed effect model     Canonical correlation analysis    

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Analysis of flue gas pollutants deep-removal technology for coal-fired power plant

Zhang Xiaolu

Strategic Study of CAE 2014, Volume 16, Issue 10,   Pages 47-51

Abstract:

In recent years, frequent haze weather makes PM2.5 becoming the publicThe control of PM2.5 has been added in the 2012 release "ambient air quality standard".Under the situation that our current flue gas pollutant control technology is difficult to remove PM2.5the Flue Gas Pollutants Deep-removal Technology (DRT) for Coal-fired Power Plant for deep-removing PM2.5the necessity and existing problems of developing DRT suitable for China, this study focused on the PM2.5

Keywords： coal-fired power plant     flue gas pollutants     deep-removal     PM2.5 removal    

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Application of Fuzzy Pattern Recognition in the Measurement of Slurry Concentration

Li Dejun,Lv Runhua,Wang Runtian

Strategic Study of CAE 2007, Volume 9, Issue 5,   Pages 81-84

Abstract:

  Slurry is widely used in construction projects, and it is important to control the slurry's physical characteristic properly. The acoustic method is used,  which can effectively monitor the physical parameters of slurry,  such as concentration. Data processing affects directly the precision in the measurement of slurry concentration by the sound attenuation and velocity. Based on the fuzzy pattern recognition, data are sorted and further classified, with cooperative clustering algorithm.

Keywords： fuzzy pattern recognition     nearest neighbor(NN)     cooperative clustering algorithm(CCA)     slurry concentration    

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PM concentration declining saves health expenditure in China

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 7, doi: 10.1007/s11783-023-1690-4

Abstract:

● Monthly hospitalization expenses are sensitive to increases in PM

Keywords： Air pollution     Health expenditure     PM2.5 concentration     Economic impact     Heterogeneous effect    

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Enhace Independent Innovation Ablity of Paper Industry,Construct Innovation System of Paper Technology

Zhang Dengchun,Weng Peifen

Strategic Study of CAE 2007, Volume 9, Issue 11,   Pages 80-86

Abstract:

Based on steady state incompressible Reynolds-averaged Navier-Stokes equation,  turbulence model,  the three-dimension airflow and concentration fields in passenger car are calculated numerically.  Regarding passengers as cubes and the exhalant CO2 as representative contaminant respectively,  the airflow and concentration distributions are investigated in non-empty state.  The results show that existing sew supply modes make the airflow distribution homogeneous except for the ends.  Body heat and solar radiation have much influence on airflow and temperature fields.  The air distribution in occupied passenger car differs from that in empty one.  The heat flux from body heat and solar radiation produces a much big temperature gradient in occupied passenger car.  The concentration is low in gangway zone while high in seat zone with crowded passengers.  The concentration in middle section is higher than that in end section and contaminant gathers in respiratory region,  and the polluted air can´t be exchanged effectively in seat zone,  which is disadvantageous to air quality in passenger car.

Keywords： passenger car     turbulence model     airflow field     concentration field     computational fluid dynamics    

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A Study of the Atmospheric Environmental Capacity of Jingjinji and of the Five Northwestern Provinces and Autonomous Regions in China

Hao Jiming,Xu Jiayu,Wu Jian and Ma Qiao

Strategic Study of CAE 2017, Volume 19, Issue 4,   Pages 13-19 doi: 10.15302/J-SSCAE-2017.04.003

Abstract: environmental capacities for sulfur dioxide (SO2), nitrogen oxides (NOx), fine particulate matter (PM2.5were calculated for the various provinces with the constraint condition of the annual average ambient PM2.5The results indicate that the total emissions of SO2, NOx, primary PM2.5, VOCs and NH3 emited from the

Keywords： PM2.5     air quality     environmental capacity    

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Research on evaluation of extinguishing concentration of superfine ammonium phosphate extinguishing agent by laser attenuation measurement

Yin Zhiping,Liu Aihua,Pan Renming

Strategic Study of CAE 2008, Volume 10, Issue 7,   Pages 90-95

Abstract:

Extinguishing concentration measurement experiments in the cup burner on two kinds of superfine ammonium phosphate extinguishing agents with different particle sizes had been done by means of filtering and weighing method combined with laser attenuation measurement. The fitting curves of particle concentration with laser attenuation rate and the extinguishing concentration of superfine particle agents had been got. The extinguishing mass concentration of two super fine agents were measured in cup burner. The results showed that when the median particle size of two kinds of extinguishing agents were 6.0 μm and 13.7μm, their laser absorption coefficients were 0.353 m2/g and 0.257 3 m2/g respectively and their mean extinguishing concentration were 32.9 g/m3 and 41.6 g/m3 respectively. Extinguishing ability of the former was 25 % to 30 % higher than that of the latter. The laser attenuation measurement relative errors were less when the former agent was used in experiment.

Keywords： laser attenuation measurement     filtering and weighing method     superfine particle extinguishing agent     extinguishing concentration    

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Title Author Date Type Operation

A New Model Using Multiple Feature Clustering and Neural Networks for Forecasting Hourly PM2.5

Hui Liu, Zhihao Long, Zhu Duan, Huipeng Shi

Journal Article

A Hybrid Neural Network Model for Marine Dissolved Oxygen Concentrations Time-Series Forecasting Based on Multi-Factor Analysis and a Multi-Model Ensemble

Hui Liu, Rui Yang, Zhu Duan, Haiping Wu

Journal Article

Diverse bacterial populations of PM in urban and suburb Shanghai, China

Journal Article

Temporal and spatial stability of the EM/PM molecular subtypes in adult diffuse glioma

Journal Article

Temporal variation of PM-associated health effects in Shijiazhuang, Hebei

Journal Article

The Potential Role of Powdery Mildew-Resistance Gene Pm40 in Chinese Wheat-Breeding Programs inthe Post-Pm21 Era

Shengwen Tang,Yuting Hu,Shengfu Zhong,Peigao Luo

Journal Article

Mi Yifeng: PM2.5 of Urban Agglomeration in the Middle Reaches of the Yellow River Spatiotemporal Heterogeneity

19 May 2022

Conference Videos

Local and regional contributions to PM in the Beijing 2022 Winter Olympics infrastructure areas during

Journal Article

PM2.5 over North China based on MODIS AOD and effect of meteorological elements during 2003‒2015

Youfang Chen, Yimin Zhou, Xinyi Zhao

Journal Article

Analysis of flue gas pollutants deep-removal technology for coal-fired power plant

Zhang Xiaolu

Journal Article

Application of Fuzzy Pattern Recognition in the Measurement of Slurry Concentration

Li Dejun,Lv Runhua,Wang Runtian

Journal Article

PM concentration declining saves health expenditure in China

Journal Article

Enhace Independent Innovation Ablity of Paper Industry,Construct Innovation System of Paper Technology

Zhang Dengchun,Weng Peifen

Journal Article

A Study of the Atmospheric Environmental Capacity of Jingjinji and of the Five Northwestern Provinces and Autonomous Regions in China

Hao Jiming,Xu Jiayu,Wu Jian and Ma Qiao

Journal Article

Research on evaluation of extinguishing concentration of superfine ammonium phosphate extinguishing agent by laser attenuation measurement

Yin Zhiping,Liu Aihua,Pan Renming

Journal Article