检索结果-内蒙古大学图书馆

Comparative analysis of hydrochemical variables of two Ramsar-listed lakes in Pokhara Valley, Nepal

International Journal of Energy and Water Resources 2023年第1期7卷 1-13页

作者： Pant, R.R. Bishwakarma, K. Pal, K.B. Thapa, L.B. Shrestha, R.G. Karuppannan, S. Garu, L. Bista, S. Singh, V.B. Central Department of Environmental Science Institute of Science and Technology Tribhuvan University Kathmandu Nepal Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China Tri-Chandra Multiple Campus Tribhuvan University Kathmandu Nepal Central Department of Botany Institute of Science and Technology Tribhuvan University Kathmandu Nepal Division of Sustainable Energy and Environmental Engineering Osaka University 2-1 Yamadaoka Osaka Suita 565-0871 Japan School of Applied Natural Sciences (SoANS) Adama Science and Technology University Adama Ethiopia Environmental Health in Disaster Program Central Department of Environmental Science Institute of Science and Technology Tribhuvan University Kathmandu Nepal School of Environmental Sciences Jawaharlal Nehru University New Delhi 110067 India

Freshwater is one of the indispensable resources for the livelihood improvement of people and ecological sustainability. This study aims to assess the hydrochemical characteristics and drinking and irrigational water quality of the Ramsar-listed Begnas Lake and Rupa Lake in the Gandaki Province, Nepal. The results revealed that the water was mildly alkaline in both lakes. The order of ionic dominancy was found to be HCO₃⁻ > SO₄²⁻ > Cl⁻ > NO₃⁻ for anions and Ca²⁺ > Na⁺ > Mg²⁺ > K⁺ for cations in both the lakes. The results showed that ion sources in both lakes were primarily regulated by carbonate type weathering, which was consistent with the results obtained from the (Ca²⁺ + Mg²⁺)/total cations and (Ca²⁺ + Mg²⁺)/(K⁺ + Na⁺) ratios, which had average values of 0.50 and 0.46;and 5.10 and 4.0, respectively, in Begnas Lake and Rupa Lake, respectively. All the irrigational indices showed that the water from both lakes was appropriate for irrigational purposes. The water quality index exhibited that the water in the study lakes was suitable for drinking purposes. The imprints of global climate change and increasing anthropic interferences could be crucial factors for the water quality management of Himalayan lakes in the future. © The Author(s), under exclusive licence to Iranian Society of environmentalists (IRSEN) and science and Research Branch, Islamic Azad University 2022.

关键词： Chemical characterization Himalaya lakes Hydrochemistry Ramsar site Water quality

来源：评论

学校读者我要写书评

暂无评论

The dependence in microcystin removal with powdered activated carbon on variant properties, carbon properties, and dissolved organic matter

引用

Chemosphere 2024年 351卷 141205页

作者： Huang, Yuzhou Lenhart, John J. Environmental Science Graduate Program The Ohio State University United States Department of Civil Environmental and Geodetic Engineering The Ohio State University United States

Powdered activated carbon (PAC) is commonly used by water treatment plants to remove harmful cyanotoxins such as microcystins (MCs) produced during seasonal harmful algal blooms. MC removal by PAC depends upon the properties of the PAC, the properties of the MC variant, and the presence and properties of dissolved organic matter (DOM). To identify which of these factors has the greatest impact on the removal of MC by PAC, we evaluated the removal of four different MC variants (MC-LR, MC-LA, MC-RR and desmethylated MC-RR) by three different PAC types (wood-based, coal-blend and coal-based). The role of DOM properties was evaluated using DOM isolated from two different sources, a terrestrial source (Suwannee River Fulvic Acid, SRFA) and a microbial source (Grand Lake St Marys DOM, GLSM). The results of adsorption experiments conducted over a period of 72 h demonstrated the wood-based PAC, which had the highest surface area and mesopore volume of the PAC tested, had the highest adsorption rate and capacity for all four MC variants. Of the variants studied, neutrally charged MC-RR was adsorbed more rapidly and to a greater extent on all of the PAC types than were the other variants. Although MC-LA and MC-LR had the greatest hydrophobicity, their negative charges resulted in their being adsorbed the least. As expected, DOM inhibited microcystin adsorption to PAC. The degree of inhibition, however, did not significantly vary for the two DOM types evaluated, indicating the properties of the DOM on MC adsorption to PAC was less important than the PAC properties or MC variant properties. Overall, PAC properties were a more important factor in MC removal than were the MC properties or DOM conditions. © 2024 Elsevier Ltd

关键词： Adsorption DOM Kinetic Mesopores Microcystin PAC

来源：评论

学校读者我要写书评

暂无评论

Exposure to trace levels of metals and fluoroquinolones increases inflammation and tumorigenesis risk of zebrafish embryos

引用

environmental science and Ecotechnology 2022年第2期10卷 12-22页

作者： Dantong Jia Ruijie Zhang Jian Shao Wei Zhang Leilei Cai Weiling Sun College of Environmental Sciences and Engineering Peking UniversityThe Key Laboratory of Water and Sediment SciencesMinistry of EducationBeijing100871China State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems International Joint Laboratory for Regional Pollution ControlMinistry of EducationBeijing100871China College of Animal Science Guizhou UniversityThe Key Laboratory of Animal GeneticsBreeding and Reproduction in the Plateau Mountainous RegionMinistry of EducationGuiyangGuizhou550025China Department of Plant Soil and Microbial SciencesEnvironmental Science and Policy ProgramMichigan State UniversityEast LansingMI48824United States College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdaoShandong266590China

Exposure to trace-level heavy metals and antibiotics may elicit metabolic disorder,alter protein expression,and then induce pathological changes in zebrafish embryos,despite negligible physiological and developmental *** study investigated the single and combined developmental toxicity of fluoroquinolones(enrofloxacin[ENR]and ciprofloxacin[CIP])(0.5 mM)and heavy metals(Cu and Cd)(0.5 mM)to zebrafish embryos,and molecular responses of zebrafish larvae upon exposure to the single pollutant(0.2 mM)or a binary metal-fluoroquinolone mixture(0.2 mM).In all single and mixture exposure groups,no developmental toxicity was observed,but oxidative stress,inflammation,and lipid depletion were found in zebrafish embryos,which was more severe in the mixture exposure groups than in the single exposure groups,probably due to increased metal bioaccumulation in the presence of ENR or *** analysis revealed the up-regulation of amino acids and down-regulation of fatty acids,corresponding to an active response to oxidative stress and the occurrence of *** up-regulation of antioxidase and immune proteins revealed by proteomics analysis further confirmed the occurrence of oxidative stress and ***,the KEGG pathway enrichment analysis showed a significant disturbance of pathways related to immunity and tumor,indicating the potential risk of tumorigenesis in zebrafish *** findings provide molecular-level insights into the adverse effects of heavy metals and antibiotics(especially in chemical mixtures)on zebrafish embryos,and highlight the potential ecotoxicological risks of trace-level heavy metals and antibiotics in the environment.

关键词： Fluoroquinolone Metal Inflammation Tumor Oxidative stress

来源：评论

学校读者我要写书评

暂无评论

Assessment of the Statistical Performance of Chemical Transport Model Studies in India

ACS ES&T Air

引用

ACS ES&T Air 2024年第12期1卷 1519-1530页

作者： Rishi Shandilya Pranav Chaudhari Srinidhi Balasubramanian Environmental Science and Engineering Department Indian Institute of Technology Bombay Mumbai India 400 076 Interdisciplinary Program in Climate Studies Indian Institute of Technology Bombay Mumbai India 400 076

India’s public health is seriously endangered by air pollution and linked to ∼0.8–0.98 million and 0.17 million premature deaths annually from chronic exposure to particulate matter (PM2.5) and ozone, respectively. Air quality forecasting tools are needed to assess the spatiotemporal variability of air pollutants and evaluate the impact of potential mitigation measures. Gridded concentrations of PM2.5and ozone are typically derived from first principle models called Chemical Transport Models (CTMs). Widespread application of CTMs, particularly for regulatory purposes, requires an understanding of model performance in comparison with observation data. A landscape approach that systematically reviews CTM model predictions and proposes benchmarks for assessing model performance can offer a way forward to build confidence in CTM-backed forecasting tools. Following similar efforts in the United States and China, we systematically shortlisted and examined model performance outcomes for 46 CTM studies reporting PM2.5and ozone predictions in India between 2008 and 2023. The reported statistical metrics for each pollutant (normalized mean bias (NMB), normalized mean error (NME), coefficient of correlation (r), and index of agreement (IOA) were rank ordered to identify two types of benchmarks: “goals” (highest achievable model accuracy based on top one-third performing studies) and “criteria” (typical model accuracy based on the top two-third performing studies). The identified goal performance for PM2.5was 17% (NMB), 34% (NME), and 0.67 (r), and ozone was 14% (NMB), 43% (NME), and 0.89 (r). These benchmarks are less restrictive than those reported for the United States and China. This highlights the need for the CTM community to coalesce around a common set of practices in evaluating CTMs. Additionally, complementary efforts in developing representative emissions inventories and including air pollution data from the expanding observational networks are required to update suc

关键词：

来源：评论

学校读者我要写书评

暂无评论

Enhanced carbon tetrachloride degradation by hydroxylamine in ferrous ion activated calcium peroxide in the presence of formic acid

引用

Frontiers of environmental science & engineering 2020年第2期14卷 75-85页

作者： Wenchao Jiang Ping Tang Zhen Liu Huan He Qian Sui Shuguang Lyu State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and TechnologyShanghai 200237China Environmental Engineering and Science Program Department of Chemical and Environmental EngineeringUniversity of CincinnatiCincinnatiOH 45221-0071USA

Hydroxyl radicals(HO*)show low reactivity with perchlorinated hydrocarbons,such as carbon tetrachloride(CT),in conventional Fenton reactions,therefore,the generation of reductive radicals has attracted increasing *** study investigated the enhancement of CT degradation by the synergistic effects of hydroxylamine(HA)and formic acid(FA)(initial[CT]=0.13 mmol/L)in a Fe(il)activated calcium peroxide(CP)fenton *** degradation increased from 56.6%to 99.9%with the addition of 0.78 mmol/L HA to the CP/Fe(II)/FA/CT process in a molar ratio o f 12/6/12/*** results also showed that the presence of HA enhanced the regeneration of Fe(II)from Fe(III),and the production of HO*increased one-fold when employing benzoic acid as the HO****,FA slightly improves the production of HO*.A study of the mechanism confirmed that the carbon dioxide radical(C02·),a strong reductant generated by the reaction between FA and HO*,was the dominant radical responsible for CT *** complete CT dechlorination was achieved in the *** presence of humic acid and chloride ion slightly decreased CT removal,while high doses of bicarbonate and high pH inhibited CT *** study helps us to better understand the synergistic roles of FA and HA for HO·and C02·^-generation and the removal of perchlorinated hydrocarbons in modified Fenton systems.

关键词： Calcium peroxide Hydroxylamine Modified Fenton Reactive oxygen species Perchlorinated hydrocarbon

来源：评论

学校读者我要写书评

暂无评论

Factors affecting the distribution of microplastics in soils of China

引用

Frontiers of environmental science & engineering 2023年第9期17卷 157-176页

作者： Yin Liu Matthias CRillig Quan Liu Jingjing Huang Muhammad Amjad Khan Xiaohui Li Qin Liu Qingqing Wang Xuesong Su Linyi Lin Yang Bai Genmao Guo Yi Huang Yong Sik Ok Shan Hu Junfeng Wang Honggang Ni Qing Huang Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province/Center for Eco-Environmental Restoration Engineering of Hainan Province/State Key Laboratory of Marine Resource Utilization in South China Sea/College of Ecology and Environment Hainan UniversityHaikou 570228China Institute of Biology Ecology of PlantsFreie Universität Berlin/Berlin Brandenburg Institute of Advanced Biodiversity Research(BBIB)Berlin 14195Germany Hainan Inspection and Detection Center for Modern Agriculture Haikou 570100China Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural SciencesBeijing 100081China China College of Management and Economics Tianjin UniversityTianjin 300072China College of Environmental Sciences and Engineering Peking UniversityBeijing 100871China Korea Biochar Research Center APRU Sustainable Waste Management Program&Division of Environmental Science and Ecological EngineeringKorea UniversitySeoul 02841Republic of Korea School of Urban Planning and Design Peking University Shenzhen Graduate SchoolShenzhen 518055China

Microplastics(MPs)are found worldwide in high abundance,posing a potential threat to *** the ubiquity of MPs in the environment,very little is known about the regional distribution of MPs and underlying factors affecting this distribution in the field,which likely include human activity,but also features of the environment ***,out of a total of 1157 datapoints investigated in 53 Chinese studies,9.68%datapoints were removed as outliers in the heterogeneity *** review revealed that the abundance of MPs was highly *** addition,microplastic(MP)distribution maps based on China demonstrated that the highest abundance of MPs tended to occur near large rivers and central land affected by the intersection of two *** model-fitting and previous studies showed that MP abundance in China was correlated with longitude,agricultural mulching film usage per capita,temperature,and ***,due to the heterogeneity of MPs and the low matching degree between the current environmental data and the sampling points,this pattern was not as evident as reported in any single *** affecting the distribution of MPs can not be captured by linear relationships alone,and systematic selection of suitable environmental factors and further model optimization are needed to explore the cause of MP pollution in ***,this review revealed an uneven distribution of MPs and serves as a reference for model prediction to assess and control plastic pollution in natural soil environments.

关键词： Microplastic distribution Microplastic heterogeneity Effecting factors Agriculture Socio-economic factors

来源：评论

学校读者我要写书评

暂无评论

The Dependence in Microcystin Removal with Powdered Activated Carbon on Variant Properties, Carbon Properties, and Dissolved Organic Matter

SSRN

引用

SSRN 2023年

Microcystins (MCs) are a class of harmful cyanotoxins produced during harmful algal blooms (HABs), and their presence demands mitigation strategies. Powdered activated carbon (PAC) adsorption is an effective treatment method for MC removal, but its efficacy is influenced by several factors. For example, MC removal varies depending upon the properties of the PAC and MC variant. Dissolved organic matter (DOM) is also known to impact MC removal by PAC. To enhance the removal of MC by PAC, it is not only necessary to investigate the individual impact of these factors but also to consider them in an integrated manner as the importance of each of these factors compared to one another is not clear. Thus, in this study we evaluated the relative importance of PAC properties, MC variant properties, and the presence of DOM on MC removal. Kinetic adsorption experiments were conducted over a period of 72 hours with four MC variants (MC-LR, MC-LA, MC-RR and desmethylated MC-RR) and three PAC types (wood-based, coal-blend and coal-based) that had different properties. The role of DOM was investigated using two different DOM sources (microbial DOM and terrestrial DOM). The results demonstrated wood-based PAC, which had the highest surface area and mesopore volume of the PAC tested, had the highest adsorption rate and capacity for all four MC variants. Of the variants studied, neutrally charged MC-RR was adsorbed more rapidly and to a greater extent on all of the PAC types than were the other variants. As expected, DOM inhibited microcystin adsorption to PAC. The degree of inhibition, however, did not significantly vary for the two DOM types evaluated and the magnitude of inhibition decreased as the DOM concentration increased. Overall, the PAC properties were a more important factor in MC removal than were the MC properties or DOM conditions. © 2023, The Authors. All rights reserved.

关键词： Adsorption

来源：评论

学校读者我要写书评

暂无评论

Evaluating A Continuous Liquid-phase Plasma Discharge Process for Destroying PFAS in Water

Evaluating A Continuous Liquid-phase Plasma Discharge Proces...

引用

2024 American Society of Agricultural and Biological Engineers Annual International Meeting, ASABE 2024

作者： Nasir, Alia Rivera, Celiannie Agyekum-Oduro, Ekow Siqab, Sidra Mohotti, Dinithi Deng, Shaobo Wu, Sarah Department of Chemical and Biological Engineering University of Idaho MoscowID83844 United States Environmental Science Program University of Idaho MoscowID83844 United States Southern Research and Outreach Center University of Minnesota 35838 120th ST WasecaMN56093 United States

ISBN: (纸本)9798331302214

Due to the lack of effective conventional treatment techniques for removing and destroying PFAS, non-thermal plasma technology has come to the center stage, but with limitations. In this study, a novel, continuous-flow, liquid-phase plasma discharge (CLPD) process was established and evaluated for its effectiveness and efficiency in removing PFOA in water. Experiments were carried out in two phases. In phase I, two carrier gases (argon and air) were studied and compared for their performance in removing PFOA by CLPD, and argon gas was found to be more effective than air (91.75% for argon vs. 79.55% for air). Then in Phase II, Argon was used as the carrier gas to evaluate other operating parameters including gas flow rate, water flow rate, water conductivity, and power applied using a two-level partial factorial design. The results showed that gas flow rate was the most significant factor among the four factors affecting the removal efficiency of PFOA by CLPD (p = 0.0029). The best combination of the four operating parameters was obtained (conductivity = 300 µs/cm, water flow rate = 150 mL/min, gas flow rate = 1.5 sL/min, and power = 100 W), under which the CFLPPD could achieve a PFOA removal rate of 93.4%. The breakdown pathway was estimated to be from PFOA to PFHPA, to PFHXA, to PFHeA, to PFBA, and then to H2O, CO2, F, and short-chain organics. Based on the results from this study, it may be concluded that the CLPD process evaluated in this project can be developed into an effective treatment to remove PFAS in contaminated water. © 2024 ASABE Annual International Meeting. All rights reserved.

关键词： Flow of gases

来源：评论

学校读者我要写书评

暂无评论

Mechanical Properties of Fine-Grained Concrete Using Fine-Red Sand and Fly Ash for Road Construction: A Case Study in Vietnam 5th

Mechanical Properties of Fine-Grained Concrete Using Fine-Re...

引用

5th International Conference on Rehabilitation and Maintenance in Civil engineering, ICRMCE 2021

作者： Sang, Nguyen Thanh Quan, Thai Minh Nguyen, May Huu Ho, Lanh Si University of Transport and Communications Hanoi Viet Nam University of Transport Technology 54 Trieu Khuc Thanh Xuan Hanoi100000 Viet Nam Civil and Environmental Engineering Program Graduate School of Advanced Science and Engineering 1-4-1 Kagamiyama Hiroshima Higashi-Hiroshima739-527 Japan

ISBN: (纸本)9789811693472

Nowadays, in order to decrease environmental impacts such as exhaustion of natural resources and CO2 discharge, the partial replacement of cement by fly ash and coarse aggregate by crushed fine aggregate in concrete have been attracted many researchers. This study concentrated on an experimental examination of the mechanical properties of fine-grained concrete using fine-red sand placement for crushed sand. Experimental tests were performed to investigate compressive, splitting tensile, and flexural strength. The results reveal that the compressive, splitting tensile, and flexural strength increased with curing time for all mixtures. The increase in the amount of fine-red sand replacement caused a decrease in all mixtures. It was also found that there is a strong correlation between compressive and splitting tensile strength with a high coefficient of determination. Besides, the results of compressive, splitting tensile, and flexural strength satisfied the requirement of concrete used for pavement. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Compressive strength

来源：评论

学校读者我要写书评

暂无评论

Wave (from) Polarized Light Learning (WPLL) method: high resolution spatio-temporal measurements of water surface waves in laboratory setups

arXiv

引用

arXiv 2024年

作者： Ginio, Noam Lindenbaum, Michael Fishbain, Barak Liberzon, Dan Faculty of Civil and Environmental Engineering Technion Haifa320003 Israel Faculty of Computer Science Technion Haifa320003 Israel Interdisciplinary program for Marine Engineering Technion Haifa Israel

Effective spatio-temporal measurements of water surface elevation (water waves) in laboratory experiments are essential for scientific and engineering research. Existing techniques are often cumbersome, computationally heavy and generally suffer from limited wavenumber/frequency response. To address this challenge, we propose the Wave (from) Polarized Light Learning (WPLL), a learning based remote sensing method for laboratory implementation, capable of inferring surface elevation and slope maps in high resolution. The method uses the polarization properties of the light reflected from the water surface. The WPLL uses a deep neural network (DNN) model that approximates the water surface slopes from the polarized light intensities. Once trained on simple monochromatic wave trains, the WPLL is capable of producing high-resolution and accurate reconstruction of the 2D water surface slopes and elevation in a variety of irregular wave fields. The method’s robustness is demonstrated by showcasing its high wavenumber/frequency response, its ability to reconstruct wave fields propagating in arbitrary angles relative to the camera optical axis, and its computational efficiency. This developed methodology is an accurate and cost-effective near-real time remote sensing tool for laboratory water surface waves measurements, setting the path for upscaling to open sea application for research, monitoring, and short-time forecasting. © 2024, CC BY-NC-ND.

关键词： Deep neural networks

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：