检索结果-内蒙古大学图书馆

18th World environmental and water resources Congress 2018: watershed Management, Irrigation and Drainage, and water resources Planning and Management

作者： Hernández, Luis Carlos Hernández Reis, Dirceu Silveira Environmental Technology and Water Resources Graduate Program Dept. of Civil and Environmental Engineering Univ. of Brasilia Brasília Brazil Dept. of Civil and Environmental Engineering Univ. of Brasilia Brasília Brazil

ISBN: (数字)9780784481400

ISBN: (纸本)9780784481400

This study explores the use of non-homogeneous hidden Markov models (NHMMs) to forecast streamflows into the Orós Reservoir, located in the State of Ceará, Northeastern Brazil. These models employ hydro-climatic information from a given year to predict the next year inflow. The Orós Reservoir is a key infrastructure in the water resources system of the state, where most rivers present very high temporal variability, which is a challenge for water managers. Streamflow forecast systems at the climate scale (months ahead) can be very useful for the challenging process of water allocation in the region. This paper explores the use of NHMMs to provide a probabilistic one-year ahead forecast of the mean annual flow for the Orós Reservoir. Results based on a forecast verification study based on 60 years of independent data show that NHMMs with two or three hidden states, employing the NINO3 climate index as exogenous variable, provides forecasts with an average value of the continuous ranked probability skill score of about 0.2-0.25, meaning that they are better than climatology. It is also evident that those models performed much better during dry years than during wet years, which may be related to lack of other climate indices. © 2018 American Society of Civil Engineers.

关键词： Hidden Markov models

来源：评论

学校读者我要写书评

暂无评论

TEMPORAL AND SPATIAL DISCRETIZATION ON QUASI-3-D GROUNDwater FINITE ELEMENT MODELLING TO AVOID SPURIOUS OSCILLATION

引用

Journal of Hydrodynamics 2007年第1期19卷 68-77页

作者： ZHANG Xiang-wei TAKEUCHI Kuniyoshi CHEN Jing Department of Planning and Program Ministry of Water Resources of P. R. China Beijing 100053 China Department of Civil and Environmental Engineering Yamanashi University Kofu Japan Institute of Guangzhou Hydraulic Engineering Design and Planning Guangzhou 510000 China

In this article, the fmite element solution of quasi-three-dimensional （quasi-3-D） groundwater flow was mathematically analyzed. The research shows that the spurious oscillation solution to the Finite Element Model （FEM） is the results choosing the small time step △t or the large element size L and using the non-diagonal storage matrix. The mechanism for this phenomenon is explained by the negative weighting factor of implicit part in the discretized equations. To avoid spurious oscillation solution, the criteria on the selection of △t and L for quasi-3-D groundwater flow simulations were identified. An application example of quasi-3-D groundwater flow simulation was presented to verify the criteria. The results indicate that temporal discretization scale has significant impact on the spurious oscillations in the finite-element solutions, and the spurious oscillations can be avoided in solving practical quasi-3-D groundwater flow problems if the criteria are satisfied.

关键词： temporal and spatial discretization spuriousoscillation finite element solution quasi-3-D groundwater flowmodels

来源：评论

学校读者我要写书评

暂无评论

Assessment of solar-assisted electrooxidation of bisphenol AF and bisphenol A on boron-doped diamond electrodes

引用

environmental Science and Ecotechnology 2020年第3期3卷 23-31页

作者： Jing Ding Lingjun Bu Bingxin Cui Guanshu Zhao Qingwei Gao Liangliang Wei Qingliang Zhao Dionysios D.Dionysiou State Key Laboratory of Urban Water Resources and Environment(SKLUWRE) School of EnvironmentHarbin Institute of TechnologyHarbin150090China Department of Water Engineering and Science College of Civil EngineeringHunan UniversityChangsha410082China Environmental Engineering and Science Program Department of Chemical and Environmental EngineeringUniversity of CincinnatiCincinnatiOH45221USA

Bisphenol(BP)analogues in wastewater effluent and groundwater pose a potential threat to human health due to their ability to disrupt steroidogenesis.A new solar-assisted electrochemical process(SECP)was developed and evaluated for the degradation of BP *** effects of quenchers,current density,initial pH,supporting electrolyte,and aqueous matrix on the removal kinetics of bisphenol AF(BPAF)and bisphenol A(BPA)were *** kinetic constants of BPAF,BPA,and bisphenol S(BPS)in the SECP with irradiation intensity of 500 mW cm^(-2) were 0.017±0.002 min^(-1),0.022±0.002 min^(-1),and 0.012±0.001 min^(-1),*** changes in the degradation rates of BPAF,BPA,and BPS in the presence of quenchers indicated the relative contribution of hydroxyl radical(·OH)oxidation,anodic electrolysis,and singlet(^(1)O_(2))oxygenation in the degradation of BPs in the *** enhanced rate of generation of ·OH and ^(1)O_(2) was observed in the SECP compared with those in the conventional electrochemical *** identification of the transformation products(TPs)of BPAF demonstrated that hydroxylation,ring cleavage,b-scission,and defluorination were the major processes during the oxidation in the *** conversion to fluoride ions(76%)and mineralization of total organic carbon(72%)in the SECP indicated further degradation of *** results from this study improved our understanding of the degradation of BP analogues in the electrooxidation irradiated by solar light and help to establish the application potential of the SECP for the effective degradation of emerging contaminants in wastewater.

关键词： Electrochemical process Solar Radicals Bisphenol AF Wastewater treatment

来源：评论

学校读者我要写书评

暂无评论

Prospecting toxicity of the avobenzone sunscreen in plants

引用

environmental Science and Pollution Research 2024年第31期31卷 44308-44317页

作者： Beijora, Sara Splendor Vaz, Thalia Aparecida Correia Santo, Diego Espirito de Almeida, Edson Araújo Junior, Osvaldo Valarini Parolin, Mauro da Silva Gonzalez, Regiane de Souza, Débora Cristina Peron, Ana Paula Chemical Engineering Course Federal Technological University of Paraná Campo Mourão Paraná Brazil Graduate Program in Environmental Engineering Federal Technological University of Paraná Paraná Francisco Beltrão Brazil Graduate Program in Chemistry State University of Maringá Paraná Maringá Brazil Academic Department of Food and Chemical Engineering Federal Technological University of Paraná Paraná Campo Mourão Brazil Graduate Program in Geography State University of Maringá Paraná Maringá Brazil Graduate Program in Food Technology Federal Technological University of Paraná Paraná Campo Mourão Brazil Graduate Program in Water Resources and Environmental Engineering Federal University of Paraná Paraná Brazil Graduate Program in Technological Innovations Federal Technological University of Paraná Via Rosalina Maria Dos Santos 1233 Paraná Campo Mourão87.301-899 Brazil

Avobenzone (AVO) is a sunscreen with high global production and is constantly released into the environment. Incorporating sewage biosolids for fertilization purposes, the leaching from cultivated soils, and the use of wastewater for irrigation explain its presence in the soil. There is a lack of information about the impact of this sunscreen on plants. In the present study, the ecotoxicity of AVO was tested at concentrations 1, 10, 100, and 1,000 ng/L. All concentrations caused a reduction in root growth of Allium cepa, Cucumis sativus, and Lycopersicum esculentum seeds, as well as a mitodepressive effect, changes in the mitotic spindle and a reduction in root growth of A. cepa bulbs. The cell cycle was disturbed because AVO disarmed the enzymatic defense system of root meristems, leading to an accumulation of hydroxyl radicals and superoxides, besides lipid peroxidation in cells. Therefore, AVO shows a high potential to cause damage to plants and can negatively affect agricultural production and the growth of non-cultivated plants. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Cell proliferation

来源：评论

学校读者我要写书评

暂无评论

Assessing snow extent variations of Illimani mountain with Landsat NDSI 37

Assessing snow extent variations of Illimani mountain with L...

引用

37th Annual IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2017

作者： Centeno, Jorge Antonio Silva Mitishita, Edson Aparecido Kishi, Regina Tiemy Federal University of Paraná Graduate Course in Geodetic Sciences Brazil Federal University of Paraná Graduate Program in Water Resources and Environmental Engineering Caixa Postal 19001 Curitiba Parana81.531-990 Brazil

ISBN: (纸本)9781509049516

Snow in the mountains is important because it keeps freshwater resources and supplies water for agriculture and human consumption. One of the most well-known mountains in Bolivia is the Illimani. In this paper the results of a multitemporal analysis of the snow cover at the Illimani are shown. Therefore, Landsat imagery of two years, 2010, and 1016 is presented. Snow cover is estimated from Landsat imagery using image processing and a snow-index. The temporal variation along a year is also compared to historical records. The results showed the seasonal variation of the snow cover area and that the glacier area is reducing. © 2017 IEEE.

关键词： Three-dimensional displays High definition video

来源：评论

学校读者我要写书评

暂无评论

The determinants of divalent/monovalent selectivity in anion exchangers

引用

Reactive Polymers, Ion Exchangers, Sorbents 1983年第2期1卷 77-89页

作者： Clifford, Dennis Weber Jr., Walter J. Environmental Engineering Program Cullen College of Engineering University of Houston Houston TX 77004 United States Water Resources Engineering Program University of Michigan Ann Arbor MI 48105 United States

This research demonstrates that it is the distance of fixed-charge separation in the resin which is the primary determinant of divalent/monovalent selectivity. Anion resins, particularly acrylics and epoxies, with closely spaced N-containing (amine) functional groups are inherently divalent-ion selective. This is because the uptake of a divalent anion, e.g. sulfate, requires the presence of two closely-spaced positive charges. Results from this study of 30 commercially-available, strong- and weak-base, anion resins indicate that in order to bring positive charges into close proximity within a resin one can: (1) incorporate the amine functional groups into the polymer chains as opposed to having them pendant on the chains;(2) minimize the size and number of organic ("R") groups attached to the N atom, i.e., minimize the size of the amine;and (3) maximize the resin flexibility, i.e., its ability to reorient to satisfy divalent counterions, by minimizing the degree of crosslinking. The distance-of-charge-separation theory is not restricted to divalent anion exchangers but also applies to cation exchangers and to polyvalent ions in general. © 1983.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Deep Neural Networks for ENSO Prediction in the Niño 3.4 and Niño 1+2 Regions

Deep Neural Networks for ENSO Prediction in the Niño 3.4 an...

引用

World environmental and water resources Congress 2023: Adaptive Planning and Design in an Age of Risk and Uncertainty

作者： Gomez-Tunque, Kennedy Richard Ingol-Blanco, Eusebio Mejia-Marcacuzco, Abel Chávarri-Velarde, Eduardo Pino-Vargas, Edwin Graduate Program in Water Resources Engineering School of Civil Engineering Universidad Nacional de Huancavelica Lima Peru Graduate Program in Water Resources Engineering Universidad Nacional Agraria la Molina Lima Peru Dept. of Civil Engineering Universidad Nacional Jorge Basadre Grohmann Tacna Peru

ISBN: (数字)9780784484852

ISBN: (纸本)9780784484852

Forecasting the El Niño-Southern Oscillation (ENSO) is one of the most challenging tasks because ENSO events show large differences in their amplitude, temporal evolution, and spatial pattern. This research discusses a deep neural network model that integrates convolutional short-term and long-term memory (ConvLSTM) to forecast the patterns of sea surface temperature that represent the evolution of ENSO over different time horizons with simultaneous space-time sequences in the Niño 3.4 and Niño 1+2 regions. Monthly gridded sea surface temperature and anomaly index data were used in El Niño regions for the period 1854-2021. In general, the methodology includes the sea surface temperature (SST) normalization of the tropical Pacific, the creation and selection of the architecture of the deep neural network model, and the training and validation. Furthermore, the forecast and evaluation of the SST and SST anomalies in space-time with the El Niño of 1982/1983 and 1997/1998 and with different time horizons for the test stage were developed. The results show a good model performance with ENSO data for El Niño 1982/1983 (training) and El Niño 1997/1998 (validation) in space and time, and with climatic indices for regions 3.4 and 1+2. The model performance was evaluated using statistical metrics of observed and forecasted data over six months in the equatorial Pacific Ocean (latitude 10°S-10°N and longitude 140°E-80°W). In general, all the metrics used to evaluate the accuracy and forecast of the model show a range from good to excellent for both El Niño regions in the six months of forecast. © World environmental and water resources Congress *** rights reserved

关键词： Surface temperature

来源：评论

学校读者我要写书评

暂无评论

Lateral stability of sandbed canals

引用

water resources Management 1987年第2期1卷 131-141页

作者： Mahmood, K. Budhu, D. Bekele, J. Mechanical and Environmental Engineering Department Water Resources Program George Washington University Civi Washington D.C. 20052 United States

The lateral stability of unlined sandbed irrigation canals is a problem in the operation and maintenance of gravity irrigation systems. This problem has been studied from the aspect of meandering thalwegs that develop in otherwise straight channels. Hydrodynamic stability analysis of two-dimensional flow in sandbed channels has been used to predice the conditions under which meandering thalwegs will develop and lead to lateral instability. The analytical study shows that, with realistic functions for hydraulic resistance and bedload transport used herein, the two parameters which determine if meandering thalwegs will develop are the discharge intensity, q and channel width W. Results of analysis are confirmed by extensive data, especially collected for this purpose from straight irrigation canals in Pakistan. This study leads to criteria for stable channel width. © 1987 D. Reidel Publishing Company.

关键词： Canals meandering rivers sandbed channel thalweg

来源：评论

学校读者我要写书评

暂无评论

2D numerical simulation of urban dam break and its effect to building using lax scheme with numerical filter 4

2D numerical simulation of urban dam break and its effect to...

引用

4th International Conference on Earthquake engineering and Disaster Mitigation, ICEEDM 2019

作者： Maitsa, Tias Ravena Indra Mardika, M Gilang Bagus Adityawan, Mohammad Harlan, Dhemi Kusumastuti, Dyah Adi Kuntoro, Arno Graduate School of Civil Engineering Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Indonesia Water Resources Engineering and Management Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Indonesia Water Resources Engineering Research Group Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Indonesia Structural Engineering Research Group Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Indonesia Center for Water Resources Development Institut Teknologi Bandung Indonesia

Dam-break is one of the disasters that can occurred due to earthquake. The earthquake vibration may damage the dam construction and therefore causing a dam-break flow. The flow can cause severe destruction to the downstream urban area. Dam-break modeling offers a way to analyze its effect of buildings. In this study, a 2D model for analyzing dam break flow is developed based on the Saint Venant equations and solved using Lax Scheme. The initial condition of the modelling is a rectangular channel with obstacles at both sides of the channel and two similar columns in the middle of the channel. These obstacles are considered as buildings in an urban area. Numerical filter is used to increase the stability of the simulation. The developed model is able to perform well in simulating a case of urban dam-break based on a previous experiment. In addition, the applied numerical filter is able to handle shock, therefore maintaining the stability of the model while reducing the simulation time without the needs to use a higher order numerical scheme. © 2020 The Authors, published by EDP Sciences.

关键词： Earthquakes

来源：评论

学校读者我要写书评

暂无评论

Methanation and chemolitrophic nitrogen removal by an anaerobic membrane bioreactor coupled partial nitrification and Anammox

引用

Frontiers of environmental Science & engineering 2023年第6期17卷 37-47页

作者： Qian Li Zhaoyang Hou Xingyuan Huang Shuming Yang Jinfan Zhang Jingwei Fu Yu-You Li Rong Chen Key Laboratory of Environmental Engineering of Shaanxi Province Xi'an University of Architecture and TechnologyXi'an 710055China Department of Civil and Environmental Engineering Graduate School of EngineeringTohoku UniversitySendai Miyagi 980-8579Japan International S&T Cooperation Center for Urban Alternative Water Resources Development Key Laboratory of Northwest Water ResourceEnvironment and Ecology(Ministry of Education)Xi'an University of Architecture and TechnologyXi'an 710055China

An AnMBR-PN/A system was developed for mainstream sewage *** verify the efficient methanation and subsequent chemolitrophic nitrogen removal,a long-term experiment and analysis of microbial activity were carried *** performance was less affected by the change of hydraulic retention time(HRT),which could provide a stable influent for subsequent PN/A *** COD removal efficiency of AnMBR was>93%during the experiment,85.5%of COD could be recovered in form of *** the HRT of PN/A being shortened from 10 to 6 h,nitrogen removal efficiency(NRE)of PN/A increased from 60.5%to 80.4%,but decreased to 68.8%when the HRTPN/A further decreased to 4 *** analysis revealed that the highest specific ammonia oxidation activity(SAOA)and the ratio of SAOA to specific nitrate oxidation activity(SNOA)provide stable NO_(2)^(−)-N/NH_(4)^(+)-N for anammox,and anammox bacteria(mainly identified as Candidatus Brocadia)enriched at the bottom of Anammox-UASB might play an important role in nitrogen *** addition,the decrease of COD in Anammox-UASB indicated partial denitrification occurred,which jointly promoted nitrogen removal with anammox.

关键词： Anaerobic membrane bioreactor Partial nitrification/Anammox Carbon separation Chemolitrophic nitrogen removal

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：