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Combination of cellulose nanocrystal and graphene oxide as modifying agent for improving the performance of PVDF membranes

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Case Studies in Chemical and Environmental engineering 2024年 10卷

作者： Sofyana Muslim, Abrar Supardan, Muhammad Dani Ambarita, Aulia Chintia Arahman, Nasrul Doctoral Program School of Engineering Science Syiah Kuala University Department of Chemical Engineering Syiah Kuala University Graduate School of Environmental Management Universitas Syiah Kuala Research Center for Environmental and Natural Resources Universitas Syiah Kuala Oil Palm and Coconut Research Center Universitas Syiah Kuala

The effectiveness of polyvinylidene fluoride (PVDF) membranes in various applications is often hampered by fouling, necessitating the exploration of modification strategies to enhance their antifouling properties. This study investigates the effect of combining cellulose nanocrystal (CNC) and graphene oxide (GO) on PVDF membranes to address this issue. Six flat sheet membranes with different compositions were fabricated using a non-solvent-induced phase separation method. The resulting membrane (M5: CNC 1 % w/w and GO 0.25 % w/w) exhibited increased surface pores, a finger-like cross-sectional structure, and higher water content. The pure water flux (PWF) in the M5 membrane increased to 37 L/m²∙h, with a humic acid (HA) rejection rate of 60 % and excellent antifouling properties (98.32 %). In conclusion, this study successfully modified PVDF membranes by combining CNC and GO, resulting in membranes with improved properties and performance. The present study provides valuable insights into composite membrane design and offers potential solutions to fouling challenges. © 2024 The Authors

关键词： Antifouling Cellulose nanocrystals Composite membrane Graphene oxide Polyvinylidene fluoride

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Erratum to “Assessing background levels of trace elements in soils of Mato Grosso (Brazil) for environmental and food security” [CATENA 244 (2024) 108267]

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CATENA 2025年 248卷

作者： F.L. Silva M.H. Martins e Silva J.B. Veiga A.C.S. Silva M.A.C. Carvalho O.L.S. Weber E.S. Eguchi M. López-Alonso E.S. Oliveira-Júnior L.R.G. Guilherme M.A.P. Pierangeli Department of Education Federal Institute of Mato Grosso Alta Floresta 78580-000 MT Brazil Department of Biology University of Mato Grosso State Alta Floresta MT 78580-000 Brazil Amazon Environmental Research Institute (IPAM) Canarana MT 78640-000 Brazil Department of Agronomy University of Mato Grosso State Alta Floresta MT 78580-000 Brazil Department of Soils and Rural Engineering Federal University of Mato Grosso Cuiabá 78060-900 MT Brazil Department of Animal Science University of Mato Grosso State Pontes e Lacerda MT 78250-000 Brazil Department of Animal Pathology University of Santiago de Compostela Lugo 27002 Spain Center of Ethnoecology Limnology and Biodiversity Laboratory of Ichthyology of the Pantanal North Graduate Program of Water Resources Management and Regulation and of Environmental Science University of Mato Grosso State Cáceres MT 78200-000 Brazil Department of Soil Science School of Agriculture Federal University of Lavras (ESAL-UFLA) Lavras MG 37203-202 Brazil Department of Animal Science Postgraduate Program of Environmental Science University of Mato Grosso State Pontes e Lacerda MT 78250-000 Brazil

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A Survivability-Centered Research Agenda for Cloud Computing Supported Emergency Response and management Systems

A Survivability-Centered Research Agenda for Cloud Computing...

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IEEE Aerospace Conference

作者： Zhanshan (Sam) Ma Ronald P. Neilson Liexun Yang Andrew Hess Richard Millar Computational Biology & Medical Ecology Lab State Key Lab. of Genetic Resources & Evolution KIZ Chinese Academy of Sciences BioClimatologist USDA Forest Service USDA Forest Services & Oregon State University Department of Management Sciences National Natural Science Foundation of China The Hess PHM Group Inc Department of Systems Engineering Naval Postgraduate School

ISBN: (纸本)9781479916191

Cloud computing is evolved from grid computing with a key support from the rapidly expanding virtualization technology. We argue that clouding computing is particularly suitable for supporting emergency response and management (ERM) because of some of its unique features such as rapid setup and deployment on ad hoc basis, highly flexible platforms (PaaS: Platform as a Service) and application services (SaaS: Software as a Service) with little time-space constraints. ERM is one of the seven critical national infrastructures and services mandated to protect by the 1999 US President's Executive Order (PCCIP). The paradigm of survivability and survivable network systems was a response of academia to the president's executive order. We concur that survivability should be the lifeline of any ERM, including the cloud computing supported (CCS) ERM systems. In this article, we present a research agenda that is aimed at developing a survivability-centered architecture for evolving reliable and survivable CCS-ERM systems. The research agenda suggests that biological and computational evolutions should be rich sources of biological inspirations as well as powerful optimization algorithm for designing (evolving) the ERM systems. The proposed research agenda advocates the application of three-layer survivability analysis, dynamic hybrid fault models, and extended evolutionary game theory modeling developed by Ma & Krings [Ma & Krings (2008a-e, 2011), Ma et al. (2009a), Ma (2008, 2009, 2010, 2011a,b). We use banking system survivability as an example to illustrate the proposed research agenda.

关键词： Cloud Computing Emergency Response and management Reliability Survivability Three-Layer Survivability Analysis Extended Evolutionary Game Theory Dynamic Hybrid Fault Models Evolutionary Computing Cloud Computing survivability Legal Services Software as a service Optimization algorithms executive command EMERGENCY RESPONSE Emergency Services VT Griffin

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Ecology, engineering, and management: Reconciling Ecosystem Rehabilitation and Service Reliability

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Restoration Ecology 2003年第3期11卷

作者： Andrew H. Baldwin Department of Biological Resources Engineering Natural Resources Management Program University of Maryland College Park MD 20742 U.S.A.

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Carbon Footprint of Rice Production in Indonesia: An Analysis of National Statistics

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IOP Conference Series: Earth and Environmental Science 2019年第1期239卷

作者： Mufidah Afiyanti Rose Novita Sari Handoko Master Program of Natural Resources Management. Postgraduate School of Multidisclipinary Studies. Universitas Brawijaya. 65145 Malang East Java Indonesia

Estimating carbon footprint (CF) of rice production could administer an insight into the input of rice production to climate change and analysing possible greenhouse gas (GHG) alleviation alternatives. In this study, data for the rice production of 34 provinces in Indonesia at year of 2015 were gathered from the Indonesian statistical data on area cultivation, productivity, fertilizer application, diesel, and irrigated water. The CF of indirect and direct carbon emissions which were correlated with those agricultural intakes was calculated with reported emission factors. The result demonstrated the CFs mean in 34 provinces during dry and rainy season in Indonesia was 1,900,341.48 kg CO eq/ha and 1,892,825.68 kg CO eq/ha, respectively. The data also showed that the highest of CF production during dry and rainy seasons obtained by Belitung Islands and East Nusa Tenggara province, respectively. Meanwhile the lowest of CF production for both dry and rainy season belonged to Yogyakarta province. Result on the quantified agricultural intakes demonstrated the irrigation water usage, fertilizer usage, direct methane and diesel for agricultural tools, had biggest to lowest contribution to CF production, respectively. Based on the result, we concluded that a rice cultivation practices which has an efficient irrigation water usage may become an option to reduce CF that leads to climate change mitigation.

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Response from Mitsch et al.:

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BioScience 2000年第3期50卷 189-190页

作者： Mitsch, William J. Ben Wu, X. Nairn, Robert W. Wang, Naiming School of Natural Resources and Graduate Program in Environmental Science The Ohio State University Columbus OH 43210 Department of Rangeland Ecology and Management Texas A&amp M University College Station TX 77843 School of Civil Engineering and Environmental Science The University of Oklahoma Norman OK 73019 National Exposure Research Laboratory US Environmental Protection Agency Cincinnati OH 45268

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Introduction

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Urban Ecosystems 1998年第2期2卷 63-63页

作者： Adams, Lowell W. Vandruff, Larry W. Natural Resources Management Program Department of Biological Resources Engineering University of Maryland USA College of Environmental Science and Forestry State University of New York Syracuse USA

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Spatial Analysis of the Soil Carbon Sequestration Potential of Crop-residue Return in China Based on Model Simulation

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Journal of resources and Ecology 2019年第2期10卷 184-195页

作者： CHEN Jinghua WANG Shaoqiang XU Xiyan SUN Leigang Key Laboratory of Ecosystem Network Observation and Modelling Institute of Geographic Sciences and Natural Resources Research Beijing 100101China College of Resources and Environment University of Chinese Academy of Sciences Beijing 100049 China School of Geography and Information Engineering China University of Geosciences Wuhan 430074 China Ecosystems Services and Management Program International Institute for Applied Systems Analysis Laxenburg A-2361 Austria Key Laboratory of Regional Climate-Environment for East Asia Institute of Atmospheric Physics Beijing 100029 China Hebei Engineering Research Center for Geographic Information Application Institute of Geographical Sciences Hebei Academy of SciencesShijiazhuang 050011 China

Crop-residue return is a recommended practice for soil and nutrient management and is important in soil organic carbon(SOC)sequestration and CO2 *** applied a process-based Environmental Policy Integrated Climate(EPIC)model to simulate the spatial pattern of topsoil organic carbon changes from 2001 to 2010under 4 crop-residue return scenarios in *** carbon loss(28.89 Tg yr–1)with all crop-residue removal(CR0%)was partly reduced by 22.38 Tg C yr–1 under the status quo CR30%(30% of crop-residue return).The topsoil in cropland of China would become a net carbon sink if the crop-residue return rate was increased from 30%to 50%,or even 75%.The national SOC sequestration potential of cropland was estimated to be 25.53 Tg C yr–1 in CR50%and 52.85 Tg C yr–1 in CR75%,but with high spatial variability across *** highest rate of SOC sequestration potential in density occurred in Northwest and North China while the lowest was in East *** in North China tended to have stronger regional SOC sequestration potential in *** the decade,the reduced CO2 emissions from enhanced topsoil carbon in CR50%and CR75% were equivalent to 1.4% and 2.9%of the total CO2 emissions from fossil fuels and cement production in China,*** conclusion,we recommend encouraging farmers to return crop-residue instead of burning in order to improve soil properties and alleviate atmospheric CO2 rises,especially in North China.

关键词： cropland crop-residue return soil carbon sequestration spatial pattern EPIC model

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Effectiveness of Situ for Ciliwung Flood Mitigation in Bogor Regency

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IOP Conference Series: Earth and Environmental Science 2020年第1期477卷

作者： Claudia Tyas Nugraheni Hidayat Pawitan Yanuar Jarwadi Purwanto Iwan Ridwansyah Postgraduate Program in Natural Resources and Environmental Management IPB Bogor Indonesia Department of Geophysics and Meteorology IPB Bogor Indonesia Department of Civil and Environmental Engineering IPB Bogor Indonesia Limnology Research Center LIPI Bogor Indonesia

Bogor Regency is one of Regencies in Jabodetabek area that is experiencing rapid urban growth. This condition impacted the decreasing conditions of 39's from 95's urban small lakes or locally known as 'situ'. This research aims to analyze the effectiveness of situ Kebantenan and situ Cikaret as Ciliwung flood mitigation measure in the Bogor Regency. The SWAT model was employed for quantification the water balance of situ and watershed management. The simulation results of the water balance analysis indicated that the monthly average of volume of Situ Kabantenan and Situ Cikaret (2008-2015) were 136,955 m3 and 508,907 m3, the annual inflow Situ Cikaret were 24,693,822 m3/year and outflow were 25,177,593 m3/year, precipitation were 648,520 m3/year, evaporation were 166,543 m3/year, delta storage (1,794) m3/year, respectively. The result of hydrological responses analysis on application of situ and watershed management scenarios that combined the structural and non-structural measures was the best scenario for decreasing maximum discharge at situ outlet which is decreased 41% discharge. So that, in order to enhance the effectiveness of situs for Ciliwung flood mitigation, the combination of the structural and non structural management of 13 situ's in Ciliwung river basin within the Bogor Regency is recommended that can increase the storage capacity from 1.8 million m3 to 4.7 million m3.

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Nucleation-Step Study of Silicon Homoepitaxy for Low-Temperature Fabrication of Si Solar Cells

Nucleation-Step Study of Silicon Homoepitaxy for Low-Tempera...

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IEEE Photovoltaic Specialists Conference

作者： Aboozar Mosleh Seyed Amir Ghetmiri Benjamin R. Conley Husam Abu-Safe Zafar Waqar Mourad Benamara Shui-Qing Yu Hameed A. Naseem MicroElectronics-Photonics Program University of Arkansas German-Jordanian University School of Natural Resources Engineering and Management Electrical Engineering Department University of Arkansas Institute for Nano Science and Engineering University of Arkansas Arkansas GREEN Research Center for Solar Cells University of Arkansas

ISBN: (纸本)9781479933006

Smooth nucleation of silicon has been achieved as a critical step in epitaxial growth process using ultra high vacuum chemical vapor deposition system at 250℃. Proper conditions were achieved by studying the effect of key nucleation parameters such as plasma power, hydrogen dilution and deposition temperature. High-resolution transmission electron microscopy has been employed to study rough nucleation condition in order to achieve perfect nucleation step, which resulted in high quality epilayers.

关键词： Epitaxial layers Crystalline materials Silicon

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