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Separating emitted dust from the total suspension in airflow based on the characteristics of PM10 vertical concentration profiles on a Gobi surface in northwestern China

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Journal of Arid Land 2022年第6期14卷 589-603页

作者： ZHANG Chunlai WANG Xuesong CEN Songbo ZHENG Zhongquan Charlie WANG Zhenting state Key Laboratory of Earth Surface Processes and Resource Ecology MOE Engineering Research Center of Desertification and Blown-sand ControlFaculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China School of Environment Beijing Normal UniversityBeijing 100875China Aerospace Engineering Department University of KansasLawrenceKS 66045-7621USA Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou 730000China

During aeolian processes,the two most critical factors related to dust emissions are soil particle and aggregate saltation,which greatly affect the vertical profiles of near-surface dust *** this study,we measured PM10 concentrations at four different heights(0.10,0.50,1.00 and 2.00 m)with and without continuous and simultaneous aeolian saltation processes on a Gobi surface in northwestern China from 31 March to 10 April,*** found that the vertical concentration profiles of suspended PM10 matched the log-law model well when there was no aeolian *** the erosion process with saltation,we divided the vertical concentration profiles of PM10 into the saltation-affected layer and the airflow-transport layer according to two different dust sources(i.e.,locally emitted PM10 and upwind transported PM10).The transition height between the saltation-affected layer and the airflow-transport layer was not fixed and varied with saltation *** this new perspective,we calculated the airflow-transport layer and the dust emission rate at different times during a wind erosion event occurred on 5 April *** found that dust emissions during wind erosion are primarily controlled by saltation intensity,contributing little to PM10 concentrations above the ground surface compared to PM10 concentrations transported from upwind *** erosion progresses,the surface supply of erodible grains is the most crucial factor for saltation *** there was a sufficient amount of erodible grains,there was a significant correlation among the friction velocity,saltation intensity and dust emission ***,when supply is limited by factors such as surface renewal or an increase in soil moisture,the friction velocity will not necessarily correlate with the other two ***,for the Gobi surface,compared to limiting dust emissions from upwind directions,restricting the transport of suspended dust in its path is by far a more efficient and

关键词： PM10 vertical concentration profiles dust emission rate saltation intensity suspensions Gobi surface

Three-Year Consecutive Field Application of Erythromycin Fermentation Residue Following Hydrothermal Treatment:Cumulative Effect on soil Antibiotic Resistance Genes

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Engineering 2022年第8期8卷 78-88页

作者： Ziming Han Haodi Feng Xiao Luan Yunpeng Shen Liren Ren Liujie Deng D.G.Joakim Larsson Michael Gillings Yu Zhang Min Yang state Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China university of Chinese Academy of sciences Beijing 100049China state Environmental Protection Engineering Center for Harmless Treatment and Resource Utilization of Antibiotic Residues Khorgos 835007China Institute for Biomedicine&the Centre for Antibiotic Resistance Research University of GothenburgGoteborg SE-41346Sweden Australian Research Council(ARC)Centre of Excellence in Synthetic Biology Department of Biological SciencesFaculty of Science and EngineeringMacquarie UniversitySydneyNSW 2109Australia

Fermentation-based antibiotic production results in abundant nutrient-rich fermentation residue with high potential for recycling,but the high antibiotic residual concentration restricts its usefulness(e.g.,in land application as organic fertilizer).In this study,an industrial-scale hydrothermal facility for the treatment of erythromycin fermentation residue(EFR)was investigated,and the potential risk of the long-term soil application of treated EFR promoting environmental antibiotic resistance development was *** treatment effectively removed bacteria and their DNA,and an erythromycin removal ratio of up to approximately 98%was *** treated EFR was utilized as organic fertilizer for consecutive field applications from 2018 to 2020,with dosages ranging from 3750 to 15000 kg·hm^(-2),resulting in subinhibitory levels of erythromycin(ranging from 0.83-76.00μg·kg^(-1))in *** shotgun sequencing was then used to characterize the antibiotic resistance genes(ARGs),mobile genetic elements(MGEs),and bacterial community composition of the *** soil ARG abundance and diversity did not respond to the treated EFR application in the first year,but gradually changed in the second and third year of *** highest fold change in relative abundance of macrolide-lincosamide-streptogramin(MLS)and total ARGs were 12.59 and 2.75 times,compared with the control(CK;without application),*** soil MGEs and taxonomic composition showed similar temporal trends to those of the ARGs,and appeared to assist in driving increasing ARG proliferation,as revealed by correlation analysis and structural equation models(SEMs).The relative abundance of particular erm resistance genes(RNA methyltransferase genes)increased significantly in the third year of treated EFR *** close association of erm with MGEs suggested that horizontal gene transfer played a critical role in the observed erm gene *** binning results demonstr

关键词： Pharmaceutical manufacturing Resistome Antibiotic Risk assessment Remediation Land application

CPSDv0: a forest stand structure database for plantation forests in China

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Big Earth Data 2023年第1期7卷 212-230页

作者： Xiuchen Wu Xiaofei Jiang Hongyan Liu Craig Allen Xiaoyan Li Pei Wang Zongshan Li Yuting Yang Shulei Zhang Fangzhong Shi Jiaojun Zhu Pengtao Yu Mei Zhou Pengwu Zhao Yanhui Wang Chao Yue Deliang Chen state Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijingChina School of Natural Resources Faculty of Geographical ScienceBeijing Normal UniversityBeijingChina College of Urban and Environmental sciences and MOE Laboratory for Earth Surface Processes Peking UniversityBeijingChina U.S.Geological Survey-Nebraska Cooperative Fish&Wildlife Research Unit School of Natural Resources423 Hardin HallUniversity of NebraskaLincolnNEUSA state Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijingChina state Key Laboratory of Hydroscience and Engineering Department of Hydraulic EngineeringTsinghua UniversityBeijingChina CAS Key Laboratory of Forest Ecology and Management Qingyuan Forest CERNInstitute of Applied EcologyChinese Academy of SciencesShenyangChina Key Laboratory of Forest Ecology and Environment of the National Forestry and Grassland Administration of China Research Institute of Forest EcologyEnvironment and ProtectionChinese Academy of ForestryBeijingChina Academy of Forestry Inner Mongolia Agricultural UniversityHuhhotChina state Key Laboratory of soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityYanglingShaanxiChina Regional Climate Group Department of Earth SciencesUniversity of GothenburgGothenburgSweden

Forest stand structure is not only a crucial factor for regulating forest functioning but also an important indicator for sustainable forest management and ecosystem *** there exists a few national/global structure databases for natural forests,a country-wide synthetic structure database for plantation forests over China,the world’s largest player in plantation forests,has not been *** this study,we built a country-wide synthetic stand structure database by surveying more than 600 peer-reviewed *** database covers tree species,mean stand age,mean tree height,stand density,canopy coverage,diameter at breast height,as well as the associated ancillary in-situ topographical and soil properties.A total of 594 pub-lished studies concerning diverse forest stand structure parameters were compiled for 46 tree *** first synthesis for stand structure of plantation forests over China supports studies on the evolution/health of plantation forests in response to rapid climate change and intensified disturbances,and benefits country-wide sustainable forest management,future afforestation or reforestation *** users include those studying forest community dynamics,regional tree growth,ecosystem stability,and health,as well as those working with conservation and sustainable *** dataset is freely acces-sible at http://***/10.11922/sciencedb.j00076.00091.

关键词： Stand structure plantation tree age tree height stand density canopy coverage

Reliability-based settlement analysis of embankments over soft soils reinforced with T-shaped deep cement mixing piles

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Frontiers of Structural and Civil Engineering 2022年第5期16卷 638-656页

作者： Chana PHUTTHANANON Pornkasem JONGPRADIST Daniel DIAS Xiangfeng GUO Pitthaya JAMSAWANG Julien BAROTH Construction Innovations and Future Infrastructures Research Center Department of Civil EngineeringFaculty of EngineeringKing Mongkut’s University of Technology ThonburiBangkok 10140Thailand 3SR Laboratory Grenoble INPFrench National Centre for Scientific Research(CNRS)Grenoble Alpes UniversityGrenoble 38000France Antea Group Antony 92160France soil Engineering Research Center Department of Civil EngineeringKing Mongkut’s University of Technology North BangkokBangkok 10800Thailand

This paper presents a reliability-based settlement analysis of T-shaped deep cement mixing(TDM)pile-supported embankments over soft *** uncertainties of the mechanical properties of the in-situ soil,pile,and embankment,and the effect of the pile shape are considered *** analyses are performed using Monte Carlo Simulations in combination with an adaptive Kriging(using adaptive sampling algorithm).Individual and system failure probabilities,in terms of the differential and maximum settlements(serviceability limit state(SLS)requirements),are *** reliability results for the embankments supported by TDM piles,with various shapes,are compared and discussed together with the results for conventional deep cement mixing pile-supported embankments with equivalent pile *** influences of the inherent variabilities in the material properties(mean and coefficient of variation values)on the reliability of the piled embankments,are also *** study shows that large TDM piles,particularly those with a shape factor of greater than 3,can enhance the reliability of the embankment in terms of SLS requirements,and even avoid unacceptable reliability levels caused by variability in the material properties.

关键词： T-shaped deep cement mixing piles piled embankments settlement reliability analysis soil uncertainties

Postglacial incision-infill cycles at the Borisoglebsk Upland: Correlations between interfluve headwaters and fluvial network

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International soil and Water Conservation Research 2019年第2期7卷 184-195页

作者： Yuliya v.Shishkina Ekaterina v.Garankina vladimir R.Belyaev Ilya G.Shorkunov Pavel v.Andreev Aleksey I.Bondar viktoria I.Potapova Tatiana A.verlova faculty of Geography Department of Geomorphology and Palaeogeography and Laboratory for Soil Erosion and Fluvial ProcessesLomonosov Moscow State UniversityLeninskie Gory1Moscow 119991Russia Institute of Geography Department of Soil Geography and EvolutionRussian Academy of SciencesStaromonetnyj Lane29Moscow 119017Russia Institute of Earth sciences of Saint-Petersburg state university St.PetersburgUniversitetskaya nab.7-9 199034Russia

The article discusses postglacial landscape transformation in the Northern Hemisphere Middle Pleistocene glaciation area located in the center of the Russian *** attempted to verify the regional paleogeographic model by reconstructing the Late Pleistocene incision-infill cycles at the Eastern Borisoglebsk Upland based on a comparison of inactive interfluves headwaters and actual fluvial network *** study was also aimed to determine the past extent of fluvial *** research of the actual and buried topography,Ethology and pedogenic properties of surface deposits was carrid out with remote sensing data interpretation,DGPS survey,and detailed description of geological cores *** study was followed by analysis of grain size,chemical and organic contents,microstructure,and numerical *** the available results,we propose a scenario of the fluvial network transformation at the Eastem Borisoglebsk Upland over the last 150 *** least four fluvial incision stages were determined while network extent has significantly changed through the Late *** can be generally associated with the regional base level decrease-Late Moscow,Late valdai and Late Holocene and accompanying isolation of the Nero Lake terraces of 130 m,100-105 m and 95-98 *** stages were separated by landscape stability or aggradation periods those were asynchronous at the middle and upper parts of the fluvial *** main agent of initial valley infill appears to be local lacustrine sedimentation altered by alluvial and colluvial deposition towards the second half of *** landscape conditions variability emphasize the importance of comprehensive local correlations for regional retrospective models.

关键词： Interfluve headwaters Fluvial Incision-Infill Cycle Pleistocene

Thermo-Hydraulic Characteristics of Non-Isothermal Batch Transportation Pipeline System with Different Inlet Oil Temperature

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Journal of Thermal science 2023年第3期32卷 965-981页

作者： CHEN Zhimin YUAN Qing JIANG Weixin LI Zongze YU Bo School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'an 710049China faculty of Environment and Life Beijing University of TechnologyBeijing 100124China state Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

The batch transportation process of several kinds of crude oil is accomplished by an entire coupled pipeline system,which exhibits complex thermo-hydraulic *** on the coupled characteristics among soil,pipelines and devices(including pumps,heating furnaces and valves),a coupled simulation model of batch transportation for the crude oil pipeline system is established,and a novel coupled simulation algorithm is *** simulation results are in good agreement with the field data of an actual crude oil pipeline *** addition,based on the numerical simulation,thermo-hydraulic characteristics of pipeline system are investigated,and some new thermo-hydraulic characteristics are *** the batch transportation process with constant flowrate,the change trends of temperature at the outlet of each pipeline segment are hysteretic and the change ranges of temperature become small along *** the adjustment of devices influences thermohydraulic characteristics to some *** the batch transportation process with variable flowrate,the complex thermo-hydraulic characteristics are exhibited,which are induced by the comprehensive influence of the changes of oil type,flowrate and absorbed/released *** with the transportation process with constant flowrate,the high-viscosity oil exhibits similar minimum temperature and lower maximum pressure in the transportation process with variable flowrate,which means that the higher transportation safety of pipeline system is *** study can provide a scientific reference for making the safer batch transportation scheme of crude oil pipeline system.

关键词： crude oil pipeline system batch transportation coupled simulation variable flowrate thermo-hydraulic characteristics

A Novel Cluster Analysis-Based Crop Dataset Recommendation Method in Precision Farming

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Computer Systems science & Engineering 2023年第9期46卷 3239-3260页

作者： K.R.Naveen Kumar Husam Lahza B.R.Sreenivasa Tawfeeq Shawly Ahmed A.Alsheikhy H.Arunkumar C.R.Nirmala Department of Computer science&Engineering Bapuji Institute of Engineering&TechnologyDavangereKarnatakaIndia Department of Information Technology Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddahSaudi Arabia Department of Information science&Engineering Bapuji Institute of Engineering&TechnologyDavangereKarnatakaIndia Department of Electrical Engineering Faculty of Engineering at RabighKing Abdulaziz UniversityJeddahSaudi Arabia Department of Electrical Engineering College of EngineeringNorthern Border UniversityArarSaudi Arabia

Data mining and analytics involve inspecting and modeling large pre-existing datasets to discover decision-making *** agriculture uses datamining to advance agricultural *** farmers aren’t getting the most out of their land because they don’t use precision *** harvest crops without a well-planned recommendation *** crop production is calculated by combining environmental conditions and management behavior,yielding numerical and categorical *** existing research still needs to address data preprocessing and crop categorization/***,statistical analysis receives less attention,despite producing more accurate and valid *** study was conducted on a dataset about Karnataka state,India,with crops of eight parameters taken into account,namely the minimum amount of fertilizers required,such as nitrogen,phosphorus,potassium,and pH *** research considers rainfall,season,soil type,and temperature parameters to provide precise cultivation recommendations for high *** presented algorithm converts discrete numerals to factors first,then reduces ***,the algorithm generates six datasets,two fromCase-1(dataset withmany numeric variables),two from Case-2(dataset with many categorical variables),and one from Case-3(dataset with reduced factor variables).Finally,the algorithm outputs a class membership allocation based on an extended version of the K-means partitioning method with lambda *** presented work produces mixed-type datasets with precisely categorized crops by organizing data based on environmental conditions,soil nutrients,and ***,the prepared dataset solves the classification problem,leading to a model evaluation that selects the best dataset for precise crop prediction.

关键词： Data mining crop prediction k-prototypes k-means cluster machine learning

Measurement of soil water content using ground-penetrating radar: a review of current methods

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International Journal of Digital Earth 2019年第1期12卷 95-118页

作者： Xinbo Liu Jin Chen Xihong Cui Qixin Liu Xin Cao Xuehong Chen state Key Laboratory of Earth Surface Processes and Resource Ecology Institute of Remote Sensing Science and EngineeringFaculty of Geographical ScienceBeijing Normal UniversityBeijingPeople’s Republic of China

soil water content(SWC)is a crucial parameter in ecology,agriculture,hydrology,and engineering *** on non-invasive monitoring of SWC has been a long-lasting topic in these *** penetrating radar(GPR),a non-destructive geophysical technique,has the advantages of high resolution,deep detection depth,and high efficiency in SWC measurements at medium *** has been successfully applied in field *** paper summarizes the recent progress in developing GPR-based SWC measurement methods,including reflected wave,ground wave,surface reflection,borehole GPR,full waveform inversion,average envelope amplitude,and frequency shift *** principles,advantages,limitations,and applications of these methods are described in detail.A comprehensive technical framework,which comprises the seven methods,is proposed to understand their principles and *** key procedures,namely,data acquisition and data processing,are emphasized as crucial to method *** suitable methods that will satisfy diverse application demands and field conditions are *** development,potential applications,and advances in hardware and data processing techniques are also highlighted.

关键词： soil water content ground penetrating radar soil permittivity average wave velocity frequency domain analysis

Reliability assessment for serviceability limit states of stiffened deep cement mixing column-supported embankments

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第9期15卷 2402-2422页

作者： Chana Phutthananon Pornkasem Jongpradist Kangwan Kandavorawong Daniel Dias Xiangfeng Guo Pitthaya Jamsawang Construction Innovations and Future Infrastructures Research Center Department of Civil EngineeringFaculty of EngineeringKing Mongkut’s University of Technology ThonburiBangkok10140Thailand Laboratory 3SR Grenoble INPCNRSGrenoble Alpes UniversityGrenoble38000France Department of Civil and Environmental Engineering National University of SingaporeSingapore119077Singapore soil Engineering Research Center Department of Civil EngineeringKing Mongkut’s University of Technology North BangkokBangkok10800Thailand

The reliability and deterministic analyses of wood-cored stiffened deep cement mixing and deep cement mixing column-supported embankments(referred to as WSCSE and DCSE,respectively)considering serviceability limit state requirements are presented in this *** field theory was used to simulate the spatial variability of soilcement mixing(SCM)material in which the adaptive Kriging Monte Carlo simulation was adopted to estimate the failure probability of a columnsupported embankment(CSE)system.A new method for stochastically generating random values of unconfined compressive strength(qu)and the ratio(Ru)between the undrained elastic modulus and qu of SCM material based on statistical correlation data is *** performance of CSEs concerning changes in the mean(μ),coefficient of variation(Cov),and vertical spatial correlation length(θv)of qu and Ru are presented and *** obtained results indicate that WSCSE can provide a significantly higher reliability level and can tolerate more SCM material spatial variability than *** performance of DCSE and WSCSE,which can be considered satisfactory in a deterministic framework,cannot guarantee an acceptable reliability level from a probabilistic *** highlights the importance and necessity of employing reliability analyses for the design of ***,consideration of only μ and Cov of qu seems to be sufficient for reliability analysis of WSCSE while for DCSE,uncertainties regarding the Ru(*** μ and Cov)and θv of qu cannot be ignored.

关键词： Reliability analysis Column-supported embankment(CSE) Stiffened deep cement mixing column Serviceability Adaptive kriging Monte Carlo simulation