检索结果-内蒙古大学图书馆

Assessing mechanisms for microbial taxa and community dynamics using process models

mLife 2023年第3期2卷 239-252页

作者： Linwei Wu Yunfeng Yang Daliang Ning Qun Gao Huaqun Yin Naija Xiao Benjamin YZhou Si Chen Qiang He Jizhong Zhou Institute of Ecology Key Laboratory for Earth Surface Processes of the Ministry of EducationCollege of Urban and Environmental SciencesPeking UniversityBeijingChina Institute for Environmental Genomics University of OklahomaNormanOKUSA Department of Microbiology and Plant Biology University of OklahomaNormanOKUSA State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijingChina School of Minerals Processing and Bioengineering Central South UniversityChangshaChina Department of Mathematics Lunt HallNorthwestern UniversityEvanstonIllinoisUSA Department of Civil and Environmental Engineering The University of TennesseeKnoxvilleTennesseeUSA Institute for a Secure and Sustainable Environment The University of TennesseeKnoxvilleTennesseeUSA School of Civil Engineering and Environmental Sciences University of OklahomaNormanOklahomaUSA Earth and Environmental Sciences Lawrence Berkeley National LaboratoryBerkeleyCaliforniaUSA School of Computer Science University of OklahomaNormanOKUSA

Disentangling the assembly mechanisms controlling community composition,structure,distribution,functions,and dynamics is a central issue in *** various approaches have been proposed to examine community assembly mechanisms,quanti-tative characterization is challenging,particularly in microbial ***,we present a novel approach for quantitatively delineating community assembly mechanisms by combining the consumer–resource model with a neutral model in stochastic differential *** time-series data from anaerobic bioreactors that target microbial 16S rRNA genes,we tested the applicability of three ecological models:the consumer–resource model,the neutral model,and the combined *** results revealed that model performances varied substantially as a function of population abundance and/or process *** combined model performed best for abundant taxa in the treatment bioreactors where process conditions were *** contrast,the neutral model showed the best performance for rare *** analysis further indicated that immigration rates decreased with taxa abundance and com-petitions between taxa were strongly correlated with phylogeny,but within a certain phylogenetic distance *** determinism underlying taxa and community dynamics were quantitatively assessed,showing greater determinism in the treatment bioreactors that aligned with the subsequent abnormal system *** its mechanistic basis,the framework developed here is expected to be potentially applicable beyond microbial ecology.

关键词： community assembly mechanisms consumer-resource model neutral model species dynamics

来源：评论

学校读者我要写书评

暂无评论

Improvement of Low-Temperature Nh3-Scr Activity Over Cevo4 Modified by Sm

SSRN

引用

SSRN 2024年

作者： Li, Yingjie Du, Jinpeng Lin, Chunxi Lin, Jinhan Liu, Jianqi Cai, Jieying Liu, Congwei Center for Excellence in Regional Atmospheric Environment Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research Station Institute of Urban Environment Chinese Academy of Sciences Ningbo315800 China University of Chinese Academy of Sciences Beijing100049 China College of Engineering Eastern Institute for Advanced Study Ningbo315201 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China

In this study, CeSmVO4 catalysts were prepared using the coprecipitation method. The Ce0.8Sm0.2V catalyst exhibited excellent NH3-SCR activity in a wide temperature window range of 175 oC to 375 oC, even under a high GHSV of 200,000 h-1. Analysis using XRD, Raman, and BET techniques revealed that doping Sm into CeVO4 enlarged the surface area and reduced the crystallite size of the catalyst. The H2-TPR and XPS results indicated that the incorporation of Sm improved the redox ability and enhanced the interaction among Ce, Sm, and V. NH3-TPD results demonstrated that the introduction of Sm into CeVO4 resulted in an increase in the number of acid sites. All these factors contributed significantly to the enhancement of low-temperature NH3-SCR reaction activity. Moreover, the addition of Sm could increase the number of Lewis acid sites, enhance the adsorption of NOx species, and promote the formation of -NH2 species and NH4NO3 species, which play a vital role in enhancing the SCR activity. The NH3-SCR reaction on the Ce0.8Sm0.2V catalyst followed both Langmuir-Hinshelwood and Eley-Rideal mechanisms. © 2024, The Authors. All rights reserved.

关键词： Temperature

来源：评论

学校读者我要写书评

暂无评论

Coastal Erosion and Flooding Risk Assessment Based On Grid Scale: A Case Study of Six Coastal Metropolitan Areas

SSRN

引用

SSRN 2024年

作者： Cao, Xuyue Sun, Yonghua Wang, Yanzhao Wang, Yihan Cheng, Xinglu Zhang, Wangkuan Zong, Jinkun Wang, Ruozeng Beijing Laboratory of Water Resources Security Capital Normal University Beijing100048 China College of Resources Environment and Tourism Capital Normal University Beijing100048 China State Key Laboratory of Urban Environmental Processes and Digital Simulation Capital Normal University Beijing100048 China Key Laboratory of 3D Information Acquisition and Application Ministry of Education Beijing100048 China

Coastal areas, situated at the critical juncture of sea-land interaction, are confronted with significant challenges from coastal erosion and flooding. It is imperative to evaluate these risks and offer scientific guidance to foster regional sustainable development. This article developed a coastal risk assessment model based on grid scale, integrating both coastal exposure and socio-ecological environment. Fourteen indicators were selected, aiming to offer a systematic approach for estimating and comparing disaster risks in coastal areas. This risk assessment model was applied to Shanghai, New York, Sydney, San Francisco, Randstad, and Tokyo metropolitan areas. The results indicate: (1) Accounting for the protective role of habitat types like mangroves and the distance attenuation effect offered a more precise representation of hazard situation;(2) The integration of the Game Theory weighting method with both subjective Analytic Hierarchy Process and objective CRITIC weighting enhanced the scientific validity and rationality of the results by minimizing deviations between subjective and objective weights;(3) Shanghai exhibited the highest average hazard and vulnerability, San Francisco had the lowest average hazard and Sydney had the lowest average vulnerability;In terms of comprehensive risk, Shanghai possessed the highest average risk, while Sydney presented the lowest. The proposed model framework is designed to swiftly identify high-risk zones, providing detailed information references for local governments to devise efficacious risk management and prevention strategies. © 2024, The Authors. All rights reserved.

关键词： Risk assessment

来源：评论

学校读者我要写书评

暂无评论

TOPS model image registration study in topographic undulating areas 3

TOPS model image registration study in topographic undulatin...

引用

3rd International Conference on Geology, Mapping and Remote Sensing, ICGMRS 2022

作者： Liu, Wenting Han, Lihua Yu, Jie Capital Normal University College of Resource Environment and Tourism Beijing China Ministry of Natural Resources of the People's Republic of China Land Satellite Remote Sensing Application Center Beijing China Capital Normal University State Key Laboratory Incubation Base of Urban Environmental Processes and Digital Simulation Beijing China Capital Normal University Key Laboratory of 3-Dimensional Information Acquisition and Application Beijing China Capital Normal University Key Laboratory of Land Subsidence Mechanism and Mitigation Beijing China

ISBN: (数字)9781665485951

ISBN: (纸本)9781665485951

The characteristics of sentinel data using terrain observation by progressive scans (TOPS) determine that its registration process is more complex and requires higher accuracy, and the synthetic aperture radar (SAR) images obtained from areas with large terrain undulations have obvious shadows and overlay masks. In this paper, we investigate the difficult problem of SAR image registration in TOPS imaging mode in areas with large terrain undulations and design a multi-stage registration method based on geometric registration, incoherent cross correlation (ICC) method, and enhanced spectral diversity (ESD) to complete the registration of sentinel image pairs and compare the accuracy of the traditional cross-correlation method with that of this paper. The experiments prove that the method described in this paper has the advantage that the registration accuracy does not depend on the image coherence, and it can still maintain a high accuracy even in areas with large topographic relief. © 2022 IEEE.

关键词： Image registration

来源：评论

学校读者我要写书评

暂无评论

simulation of Groundwater Levels Considering Natural and Anthropologic Factors Through Deep Learning Model

SSRN

引用

SSRN 2024年

作者： Li, Shuai Zhu, Lin Gong, Huili Li, Xiaojuan Li, Binghua Teatini, Pietro College of Resource Environment and Tourism Capital Normal University Beijing China Beijing Laboratory of Water Resources Security Capital Normal University Beijing China State Key Laboratory Incubation Base of Urban Environmental Processes and Digital Simulation Capital Normal University Beijing China Beijing Institute of Water Science and Technology Beijing China Department of Civil Environmental and Architectural Engineering University of Padova Padova Italy Querétaro Mexico

Groundwater level (GWL) serves as an important indicator in the precise evaluation of groundwater resources, forming the cornerstone of effective groundwater management and land subsidence prevention. numerical model, a commonly used tool for simulating GWL, requires complex input parameters related to hydrogeological and geological structures. Data-driven model has been widely used within the geoscience community due to its high accuracy. However, these models often exhibit limited interpretability. This paper introduces an approach by integrating the Multi-head Self-attention mechanism with Gate Recurrent Unit (GRU) (MSAM-GRU) model to detect the response of GWL across different aquifers to variations in precipitation and groundwater withdrawal. During the modelling, it takes novelty account of hydraulic connection between various aquifers, and incorporates the lag time between GWL in unconfined aquifer and precipitation, as well as between GWL in confined aquifers and those in upper aquifer. This integration aims to enhance both the accuracy and interpretability of the model. To validate our method, we conducted a case study in the Beijing Plain, China. Results reveal that the lag time between GWL in the unconfined aquifer and precipitation ranges from 2 to 4 months, while the lag time between GWL in the confined aquifer and those in upper aquifers ranges from 3 to 4 months. Furthermore, the results indicate a significant improvement in simulation accuracy by 31% compared to models that do not consider lag time. The performance of MSAM-GRU model surpasses that of both AM-GRU and the traditional GRU model when simulating GWLs of confined and unconfined aquifers simultaneously. The model was also employed to further analyze the response of GWL in the first aquifer group under varying precipitation and withdrawal conditions, considering the GWL recovery in this aquifer group may impact subway operations. Under conditions of solely reducing groundwater pumping volume

关键词： Aquifers

来源：评论

学校读者我要写书评

暂无评论

Preface to the Special Issue on Carbon Neutrality: Important Roles of Renewable Energies, Carbon Sinks, NETs, and non-CO_(2) GHGs

引用

Advances in Atmospheric Sciences 2022年第8期39卷 1207-1208页

作者： Junji CAO Ning ZENG Yi LIU Bengang LI Pengfei HAN Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China Department of Atmospheric and Oceanic Science and Earth System Science Interdisciplinary CenterUniversity of MarylandCollege Park 20742MarylandUSA State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Carbon Neutrality Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China Sino-French Institute for Earth System Science Laboratory for Earth Surface ProcessesCollege of Urban and Environmental SciencesPeking UniversityBeijing 100871China

The year 2020 witnessed milestone commitments to carbon neutrality with the EU,China,USA,Japan,South Korea,Canada,and South Africa,each pledging to reach net-zero carbon *** that have adopted or have considered net-zero targets now represent 63%of the total contributions to global greenhouse gas(GHG)*** the efforts of all parties,the 26th Conference of the Parties(COP26)achieved a package of outcomes in the Glasgow Climate ***,a breakthrough consensus was reached on reducing coal,controlling methane,and halting deforestation(Wang et al.,2022,Page 1209).To achieve net-zero carbon,we need to take action to implement the Paris Agreement and the Glasgow Climate Pact Since the global temperature slowdown of the nationally determined contributions(NDC)scenario is only 0.6°C,all countries need to pursue stricter carbon reduction policies for a more sustainable world.(Fu et al,2022,Page 1209).

关键词： breakthrough neutral methane

来源：评论

学校读者我要写书评

暂无评论

Quantitative understanding of the contribution of factors on land subsidence with maximal information coefficient: a case study in Tongzhou, Beijing, China

引用

Groundwater for Sustainable Development 2025年 30卷

作者： Zhuangzhuang Liu Guangyao Duan Jijun He Moyuan Yang Menglin Zhang Binyuan Lei College of Resource Environment and Tourism State Key Laboratory of Urban Environmental Processes and Numerical Simulation Capital Normal University Beijing 100048 China Beijing Water Science and Technology Institute Beijing 100048 China School of Geology and Geomatics Tianjin Chengjian University Tianjin 300384 China

By analyzing the spatial and temporal distribution, evolution law and driving factors of land subsidence in Tongzhou area, we can provide scientific basis for regional disaster prediction, prevention and urban planning. This study utilized the IPTA-based SBAS-InSAR method, incorporating multiple data sources to obtain surface deformation results for Tongzhou District from 2003 to 2018, and the distribution characteristics and spatiotemporal evolution patterns of land subsidence were studied in Beijing's Tongzhou District. Additionally, using the MIC method, combined with spatial analysis techniques and statistical methods, the study analyzed the impact of factors such as groundwater levels in different aquifers and the thickness of compressible layers on land subsidence. The results revealed that land subsidence in Beijing's Tongzhou District is unevenly distributed, with major subsidence areas concentrated in BMAC and Taihu. During the study period, surface deformation rates ranged from −147 to 24 mm/yr, showing an initial acceleration followed by a deceleration trend. The third and fourth aquifers were identified as the dominant factors influencing changes in land subsidence, and interactions between different aquifers may also play a role. For varying compressible thicknesses, the second and third layers were the primary contributors to land subsidence. This study provides valuable insights into the mechanisms of land subsidence in Tongzhou District, offering a foundation for further research and informing decision-making for sustainable urban development.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Direct Synthesis of High Silica Ssz-16 Zeolite with Extraordinarily Superior Performance in Nh3-Scr Reaction

SSRN

引用

SSRN 2023年

作者： Han, Shichao Rao, Wei Hu, Junyi Tang, Xiaomin Ma, Ye Du, Jinpeng Liu, Zhongqi Wu, Qinming Ma, Yanhang Meng, Xiangju Shan, Wenpo Xiao, Feng-Shou He, Hong Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research Station Institute of Urban Environment Chinese Academy of Sciences Ningbo315800 China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in Wuhan Key Laboratory of Magnetic Resonance in Biological Systems Wuhan Institute of Physics and Mathematics Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan430071 China School of Physical Science and Technology Shanghai Key Laboratory of High-resolution Electron Microscopy ShanghaiTech University Shanghai201210 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China College of Chemical and Biological Engineering Zhejiang University Hangzhou310027 China Key Lab of Applied Chemistry of Zhejiang Province Department of Chemistry Zhejiang University Hangzhou310007 China

The development of Cu ion-exchanged small-pore zeolites with excellent performance and high hydrothermal stability in NH3-SCR reaction is of great importance. However, many frameworks of the small-pore zeolites are Al-rich, for instance, Cu-SSZ-16 zeolite with Si/Al ratio always no more than 5, showing relatively low hydrothermal stability. In this work, inspired by theoretical calculation for the interaction between organic structural directing agents (OSDAs) and zeolite framework, high silica SSZ-16 zeolite with Si/Al ratio at 6.7 was directly synthesized using an economical diquaternary alkylammonium cation as an OSDA. After exchanged with Cu ion, the Cu-SSZ-16 catalyst shows extraordinarily superior performance in NH3-SCR reaction even after hydrothermal aging at 900 °C. The designed synthesis combined with excellent performance as well as high hydrothermal stability of the high silica SSZ-16 zeolite might provide an attractive alternative candidate for NH3-SCR catalyst on diesel vehicles and non-road mobile machinery in the future. © 2023, The Authors. All rights reserved.

关键词： Zeolites

来源：评论

学校读者我要写书评

暂无评论

Spatial Downscaling of Remote Sensing Precipitation Data in the Beijing-Tianjin-Hebei Region

引用

Journal of Computer and Communications 2021年第6期9卷 191-202页

作者： Nuan Wang Jie Yu Lin Zhu Yanbing Wang Zhengyang He College of Resource Environment and Tourism Capital Normal University Beijing China State Key Laboratory Incubation Base of Urban Environmental Processes and Digital Simulation Beijing China Henan Geological Bureau China Chemical Geology and Mine Bureau Zhengzhou China Beijing Laboratory of Water Resources Security Beijing Municipal Education Commission Beijing China Key Laboratory of 3-Dimensional Information Acquisition and Application Ministry of Education Beijing China

Precipitation is an important part of the global hydrological cycle. The large- scale, high-precision continuous precipitation data obtained by satellite remote sensing detection technology has become an important source of spatial precipitation data. However, because the spatial resolution of remote sensing precipitation data is still low, it is difficult to meet the needs of hydrological research, which restricts their application in drought and flood analysis, hydrological simulation, etc. In response to this problem, this paper takes the Beijing-Tianjin-Hebei region as the research area, downscaling the TRMM data and the GPM data space of the continuation plan, and increasing the spatial resolution of the data to 1 km. Compared with the original data, spatial downscaling data not only greatly improves the spatial resolution, but also increases the accuracy of the data, which has better applicability.

关键词： TRMM GPM Spatial Downscaling Geographically Weighted Regression

来源：评论

学校读者我要写书评

暂无评论

Calibration and Modelling of Vegetation Structure Parameter B for L-Meb Models Over Agricultural Sites

SSRN

引用

SSRN 2024年

作者： Zhang, Hui Wang, Hongquan Sun, Zhibin Gao, Lun Wang, Yixiang Tong, Cheng Zhu, Luyao Shi, Zhou Institute of Agricultural Remote Sensing and Information Technology Application College of Environmental and Resource Sciences Zhejiang University Hangzhou310058 China Agriculture and Agri-Food Canada Lethbridge Research and Development Centre LethbridgeAB Canada Jiangsu Key Laboratory for Numerical Simulation of Large-Scale Complex Systems Nanjing Normal University Nanjing210023 China Agroecosystem Sustainability Center Institute for Sustainability Energy and Environment the University of Illinois at Urbana-Champaign UrbanaIL61801 United States State Key Laboratory of Subtropical Silviculture Zhejiang A&F University Hangzhou311300 China Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province Zhejiang A&F University Hangzhou311300 China College of Environment and Resource Sciences Zhejiang A&F University Lin’an Zhejiang311300 China Research Institute for Urban Planning and Sustainability Hangzhou City University Hangzhou310015 China Key Laboratory of Spectroscopy Sensing Ministry of Agriculture Hangzhou310058 China

Passive microwave observations of vegetation water content (VWC) are important to monitor vegetation growth status and terrestrial aboveground biomass. To constrain the L-band Microwave Emission of the Biosphere (L-MEB) model for NASA’s Soil Moisture Active Passive (SMAP) satellite mission, vegetation structure parameter b is often used to estimate VWC from the climatological Normalized Difference Vegetation Index (NDVI). However, little is known about what and how the driving factors impact the parameter b and its modeling due to the lack of quantitative analysis. Based on the Passive Active L-band Sensor (PALS) data from the SMAPVEX16-MB campaign, this study firstly calibrated the parameter b for canola, wheat and soybean. Afterwards, a Random Forest algorithm was employed to model b-values using both h and v polarized observations with the input features screened by correlation analysis and stepwise regression for each vegetation type, the R2 of which exceeds 82%. Considering the poor interpretability of machine learning algorithms, we also employed multivariable-linear regression to quantify their influence on b-values and achieved an R2 exceeding 75%. The results showed all three crop types had an increasing trend in b-values at dual-polarization with their growth, except for wheat which exhibited a decreasing trend at v-polarization. Among the three crops, wheat and soybean indicated sharp changes in b-values, particularly during the late growth stage, while canola exhibited slower changes. The b-values were higher at v-polarization than at h-polarization, except for wheat during the early growth stage and at the end of the late growth stage. The results of multivariable regression with vegetation type as dummy variables (soybean as the control) indicated that crop type significantly affected b values, with canola and wheat exhibiting positive effects on b-values at h-polarization but negative effects at v-polarization. Additionally, we found that VWC, biomass

关键词： Polarization

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：