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Building Simulation 2022年第6期15卷 1111-1132页

作者： Fabio Nardecchia Laura Pompei Fabio Bisegna Department of Astronautic Electric and Energy EngineeringSapienza UniversityVia Eudossiana 18RomeItaly

Air distribution of HVAC systems is the most popular type used in the building sector,having a relevant impact on indoor air quality and occupant *** types of research developed optimal solutions for the HVAC system’s design,focusing on specific components of the distribution system,on the airflow and geometry of ducts,on the size of ducts,on the shape and position of air ***,few works in literature proposed a globally experimental and simulation analysis of an air distribution system with a variable mass flaw *** this line,the presented research investigates the potentialities of a new ceiling diffuser,installed in an exhibition *** system provides a variable mass flow rate thanks to its configuration,providing adequate thermal comfort.A warm wall is chosen as the heating *** tests are carried out,six for cooling and two for heating with different volumetric air rates and supply air temperature of the *** combination of two methods,the measurement campaigns and the computational fluid dynamics(CFD)technique represent a suitable approach to examine the thermal indoor *** general,results show a strong capability of this diffuser to provide a uniform temperature and velocity field inside the ***,experimental and numerical data are significantly comparable with an average deviation of 1%for the velocity and lower 1%for the temperature,guaranteeing an optimal distribution of the understudy environmental parameters on the vertical and horizontal planes.

关键词： environmental parameters CFD field measurements INDULINE HVAC systems thermal comfort

Effects of particle composition and environmental parameters on catalytic hydrodechlorination of trichloroethylene by nanoscale bimetallic Ni-Fe

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Journal of environmental Sciences 2014年第5期26卷 1162-1170页

作者： Jianjun Wei Yajing Qian Wenjuan Liu Lutao Wang Yijie Ge Jianghao Zhang Jiang Yu Xingmao Ma Department of environmental Science and Engineering Beijing University of Chemical Technology Department of Civil and environmental Engineering Southern Illinois University Carbondale

Catalytic nickel was successfully incorporated into nanoscale iron to enhance its dechlorination efficiency for trichloroethylene （TCE）, one of the most commonly detected chlorinated organic compounds in groundwater. Ethane was the predominant product. The greatest dechlorination efficiency was achieved at 22 molar percent of nickel. This nanoscale Ni-Fe is poorly ordered and inhomogeneous; iron dissolution occurred whereas nickel was relatively stable during the 24-hr reaction. The morphological characterization provided significant new insights on the mechanism of catalytic hydrodcchlorination by bimetallic nanoparticles. TCE degradation and ethane production rates were greatly affected by environmental parameters such as solution pH, temperature and common groundwater ions. Both rate constants decreased and then increased over the pH range of 6.5 to 8.0, with the minimum value occurring at pH 7.5. TCE degradation rate constant showed an increasing trend over the temperature range of 10 to 25℃. However, ethane production rate constant increased and then decreased over the range, with the maximum value occurring at 20℃, Most salts in the solution appeared to enhance the reaction in the first half hour but overall they displayed an inhibitory effect. Combined ions showed a similar effect as individual salts.

关键词： nanoscale Ni-Fe trichloroethylene hydrodechlorination catalytic dechlorination composition environmental parameters

Detecting patterns of climate change in long-term forecasts of marine environmental parameters

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International Journal of Digital Earth 2020年第5期13卷 567-585页

作者： Gianpaolo Coro Pasquale Pagano Anton Ellenbroek Istituto di Scienza e Tecnologie dell’Informazione“A.Faedo”–CNR PisaItaly b Food and Agriculture Organization of the United Nations(FAO) RomeItaly

Forecasting environmental parameters in the distant future requires complex modelling and large computational *** to the sensitivity and complexity of forecast models,long-term parameter forecasts(*** to 2100)are uncommon and only produced by a few organisations,in heterogeneous formats and based on different assumptions of greenhouse gases ***,data mining techniques can be used to coerce the data to a uniform time and spatial representation,which facilitates their use in many *** this paper,streams of big data coming from AquaMaps and NASA collections of 126 long-term forecasts of nine types of environmental parameters are processed through a cloud computing platform in order to(i)standardise and harmonise the data representations,(ii)produce intermediate scenarios and new informative parameters,and(iii)align all sets on a common time and spatial *** series crosscorrelation applied to these aligned datasets reveals patterns of climate change and similarities between parameter trends in 10 marine *** results highlight that(i)the Mediterranean Sea may have a standalone‘response’to climate change with respect to other areas,(ii)the Poles are most representative of global forecasted change,and(iii)the trends are generally alarming for most oceans.

关键词： Climate change environmental parameters forecasting environmental parameters time series ecological modelling species distribution modelling AquaMaps NASA Earth Exchange

Effect of copper slag recovery on hydrometallurgical cut-off grades considering environmental aspects

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Journal of Central South University 2016年第4期23卷 798-807页

作者： AFSHIN AKBARI ESMAEIL RAHIMI Department of Mining Engineering Islamic Azad University-Central Tehran Branch Department of Mining Engineering Islamic Azad University-South Tehran Branch

Determining the hydrometallurgical cut-off grades specifies the destination of low grade materials and this is subjected to more benefits in mining. Copper production rate is considered as one of the fundamental issues in hydrometallurgical cut-off grades determination. Slags are remarked as one of the main sources of copper. It is not only regarded as a waste but also identified as another resource extracting base metals. Slags are characterized by copper high grade. Thus, slag copper recovery can be led to different cut-off grades and net present value(NPV). The current research scrutinizes the effect of slag recovery by both flotation and hydrometallurgical methods on the hydrometallurgical cut-off grades. For this purpose, the optimum cut-off grade algorithms of hydrometallurgical methods are developed by considering associated environmental parameters, incomes and also the costs. Then, their optimum amounts are calculated with NPV maximization as an objective function. The results indicate that considering slag copper recovery in the hydrometallurgical cut-off grade algorithms reduces the environmental costs caused by slag dumping and leads to more NPV by 9%.

关键词： hydrometallurgy cut-off grades low grade materials waste floatation slag copper recovery environmental parameters slag dumping NPV maximization

Synergistic effect of seawater's parameters on the corrosion rate of the austenitic stainless steel 304

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Acta Metallurgica Sinica(English Letters) 2010年第3期23卷 161-170页

作者： S.Atashin M.Pakshir A.Yazdani Department of Materials Science and Engineering Shiraz University

In this article the corrosion rate of the austenitic stainless steel type 304, under the synergistic effect of environmental factors has been assessed via potentiodynamic polarization ***, velocity, pH and temperature are the factors which induce effects on the corrosion rate of the considered *** analysis is applied using the full two-level factorial experimental design method, which results in the contribution value of each parameter in changing the quantity of average corrosion rate in both individual and synergistic *** this quantitative analysis, qualitative analysis has been used to predict the variation *** two analyses show the important role of the synergistic action, which changes the variation direction of corrosion rate and the contribution percentage of each parameter in varying the value of corrosion *** both these analyses can show the magnitude and quality of each parameter＇s effect, which is remarkably valuable in marine applications.

关键词： Stainless steel 304 environmental parameters Seawater corrosion Synergistic effect

Numerical Simulation of Icing on Nrel 5-MW Reference Offshore Wind Turbine Blades Under Different Icing Conditions

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China Ocean Engineering 2022年第5期36卷 767-780页

作者： CAO Hui-qing BAI Xu MA Xian-dong YIN Qun YANG Xiang-yu School of Naval Architecture&Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China The Department of Engineering Lancaster UniversityLancaster LA14YWUK

Offshore wind energy resources are operational in cold regions,while offshore wind turbines will face the threat of ***,it is necessary to study icing of offshore wind turbines under different icing *** this study,icing sensitivity of offshore wind turbine blades are performed using a combination of FLUENT and FENSAP-ICE software,and the effects of liquid water content(LWC),medium volume diameter(MVD),wind speed and air temperature on blade icing shape are analyzed by two types of ice,namely rime ice and glaze *** results show that the increase of LWC and MVD will increase the amount of ice that forms on the blade surface for either glaze ice or rime ice,and an increase of MVD will expand the adhesion surface between ice and *** reaching the rated wind speed of 11.4 m/s,it does not directly affect the icing ***,after reaching the rated wind speed,the attack angle of the incoming flow decreases obviously,and the amount of ice increases *** the ambient air temperature meets the icing conditions of glaze ice(i.e.,−5℃ to 0℃),the lower the temperature,the more glaze ice freezes,whereas air temperature has no impact on the icing of rime *** with onshore wind turbines,offshore wind turbines might face extreme meteorological conditions,and the wind speed has no impact on the amount of ice that forms on the blade surface for most wind speeds.

关键词： environmental parameters cold regions offshore wind turbine rime glaze numerical simulation

Tidal water exchanges can shape the phytoplankton community structure and reduce the risk of harmful cyanobacterial blooms in a semi-closed lake

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Journal of Oceanology and Limnology 2022年第5期40卷 1868-1880页

作者： Wenxu ZHENG Renhui LI Wenli QIN Binbin CHEN Min WANG Wanchun GUAN Xiaoling ZHANG Qiao YANG Min ZHAO Zengling MA Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection Wenzhou UniversityWenzhou 325035China National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution Wenzhou UniversityWenzhou 325035China Department of Marine Biotechnology School of Laboratory Medicine and Life ScienceWenzhou Medical UniversityWenzhou 325035China Marine Science and Technology College Zhejiang Ocean UniversityZhoushan 316022China School of Petrochemical Engineering and Environment Zhejiang Ocean UniversityZhoushan 316022China

For estuaries,inland lakes play a vital role in the ecological balance under the impact of tide *** effect of tides-induced water exchange on phytoplankton community in a semi-closed lake was studied and compared with that of an adjacent closed lake in the Oujiang River mouth in Zhejiang,East China Sea,from June 29,2020 to June 14,*** show that the dominant species,abundance,dominance,and diversity of the phytoplankton species between the two lakes were significantly *** the closed lake,cyanobacteria were the dominant species during the study *** the semi-closed lake,the diversification of the dominant species was greater,and some species of diatoms and green algae became *** average phytoplankton abundance in the closed lake was 6 times of that in the semi-closed *** average dominance of cyanobacteria in the closed lake was 0.96,and those in the semi-closed lake and the Oujiang River were 0.51 and 0.22,*** blooms occurred throughout the study time in the closed lake but not in the semi-closed ***,the species diversity richness of the phytoplankton in the semi-closed lake was higher than that of the closed one,and the phytoplankton community between the closed lake and semi-closed lake could be divided into distinctly different groups based on non-metic multidimensional scaling analysis(NMDS)and analysis of similarities(ANOSIM)*** salinity of the water was significantly greater and the transparency significantly smaller in the semi-closed lake than those in the closed ***,water exchange driven by local tidal movement increased salinity and decreased transparency of water,which consequently shaped the community structures of different phytoplankton and reduced the risk of a cyanobacterial bloom outbreak in the semi-closed lake.

关键词： estuary harmful cyanobacterial blooms phytoplankton community water exchange tidal movement environmental parameters

Benthic Habitat Quality Assessment Based on Biological Indices in Xiaoqing River Estuary and Its Adjacent Sea of Laizhou Bay,China

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Journal of Ocean University of China 2017年第3期16卷 537-546页

作者： LUO Xianxiang LIN Song YANG Jianqiang SHEN Jiayu FAN Yuqing ZHANG Longjun Key Laboratory of Marine Environment and Ecology Ministry of Education Ocean University of China Qingdao 266100 P. R. China North China Sea Branch of the State Oceanic Administration Qingdao 266033 P. R. China

Based on the macrofauna data(2008-2011) in Xiaoqing River estuary and its adjacent sea, Laizhou Bay of Bohai Sea, China, the AZTI Marine Biotic Index(AMBI) and Multivariate AMBI(M-AMBI) were used for benthic habitat quality(BHQ) assessment. Results showed that BHQ presented an obvious trend of improvement along the direction of stream channel and river mouth, and in the coastal areas. AMBI and M-AMBI were significantly related to environmental pressure gradient data. Therefore, the two indices can well indicate BHQ in the studied area. However, there were significant differences between results of the two indices. In the cases of low taxa number and high abundance of single species, AMBI might overestimate BHQ. We thus adjusted its thresholds to solve this problem. And M-AMBI might overestimate BHQ when benthic assemblage was dominated by the opportunistic species. Then we could raise the weight of AMBI in the calculation of M-AMBI to handle the problem.

关键词： Xiaoqing River estuary benthic habitat quality (BHQ) AMBI M-AMBI environmental parameters

Study on forecasting the parameters of gas environment of metro station

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Energy and Built Environment 2021年第4期2卷 374-379页

作者： Liping Pang Xiyue Wang Hongquan Qu Bo Li Qing Tian School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China School of Information Science and Technology North China University of TechnologyBeijing 100144China

In the crowded metro station,it is important to forecast the changes of environmental parameters for the normal operation of metro and the safety of passengers in the *** Neural Network(ANN)has a good perfor-mance on processing time series *** order to accurately predict environmental parameters,this paper uses ANN method to build the forecasting model of environmental *** forecasting model uses the external environment parameters of the station as input ***,the accuracy of the model is verified by the field data collected from the metro *** results show that the mean relative error of the proposed method is within 10%.The forecasting model based on ANN in this paper can accurately forecast the internal environment parameters of the metro station in the future period and is of great significance of emergency prevention and decision-making.

关键词： Metro station environmental parameters Forecasting Neural network

Soil CO₂ Efflux Dynamics and Its Relationship with the environmental Variables in a Sub-Tropical Mixed Forest

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Open Journal of Forestry 2022年第3期12卷 312-336页

作者： Deepa Dhital Rabina Manandhar Puruswattam Manandhar Sanu Raja Maharjan Faculty of Science Nepal Academy of Science and Technology (NAST) Kathmandu Nepal Department of environmental Science Khwopa College Kathmandu Nepal

Soil CO2 efflux is an ongoing process of respiration from soil;plant parts/ microbes below the ground to the atmosphere which is known for faster cycling of carbon sources. A large portion of carbon sequestered and fixed by forests is returned to the atmosphere through soil CO2 efflux and multiple controlling parameters mainly temperature, precipitation, and growth factors interact with the soil CO2 efflux variation. This study assessed the soil CO2 efflux every month for consecutive 2-years (August 2015 to July 2017) by using the closed chamber method to determine the role of ecological parameters that govern the soil CO2 efflux and its temporal modification in a sub-tropical mixed forest of central region in Nepal. The results of this study manifested that soil CO2 efflux accounted 63.2% (y = 31.96e0.128x), 71.3% (y = 44.77e0.123x) and 64.5% (y = 44.11e0.117x) variations in soil temperature with significantly (p 10) of the soil CO2 efflux was 3.6, 3.4, and 3.2, respectively. Soil water content also expressed significantly (p 2 efflux and accounted 62.0% (y = 138.3e0.057x), 46.1% (y = 88.42e0.052x) and 40.5% (y = 133.1e0.0447x) in its variability in different years and the merged years. Evident variations of soil CO2 efflux, soil temperature, soil water content, and litter were observed in the forest seasonally and inter-annually. Two years mean total annual soil CO2 efflux of the forest was estimated at 904.76 g C·m-2·y-1. The study revealed that sub-tropical forests could be more influenced by precipitation regimes in progressing warm climates i.e. vulnerable to c

关键词： Soil CO2 Efflux environmental parameters Temperature Sensitivity (Q10) Sub-Tropical Forest Climate Change