检索结果-内蒙古大学图书馆

89th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2016

作者： Hong, Soklida Ratpukdi, Thunyalux Sivaguru, Jayaraman Khan, Eakalak Environmental and Conservation Sciences Program North Dakota State University FargoND58108 United States International Postgraduate Programs in Environmental Management Graduate School Chulalongkorn University Bangkok10330 Thailand Department of Environmental Engineering Khon Kaen University Khon Kaen40002 Thailand Department of Chemistry and Biochemistry North Dakota State University FargoND58108 United States Department of Civil and Environmental Engineering North Dakota State University FargoND58108 United States

ISBN: (纸本)9781510870475

Glutaraldehyde (GA) has been used extensively as a biocide in hydraulic fracturing fluids leading to the contamination of the compound in flowback and produced waters. Photolysis of GA in water was performed under UV irradiation using monochromatic lamps with a wavelength of 254 nm. The results indicated that photolysis of GA followed pseudo-first order kinetics. GA can be photolyzed by UV at all studied conditions;however, the degradation rates of GA were different at different light intensities, pHs, initial GA concentrations and salt concentrations. The degradation rate of GA increased with increasing incident light intensity and decreasing pH. Increasing in initial GA concentration resulted in decreasing rate of GA. At lower salt concentrations, notable retardation of GA degradation rate was observed. Quenching experiments were also conducted to further explore the mechanisms of GA photolysis. Higher molecular weight compounds were identified as the main photolytic byproducts. Copyright ©2016 Water Environment Federation.

关键词： Hydraulic fracturing

来源：评论

学校读者我要写书评

暂无评论

Design and Construction of Smart Cities 1

引用

丛书名： Sustainable civil Infrastructures

1000年

作者： Ibrahim El Dimeery Moustafa Baraka Mona B. Anwar Mahmoud El Khafif Nagy Hanna Syed M. Ahmed Amin Akhnoukh Amr T. Abdel Hamid

ISBN: (数字)9783030642174

ISBN: (纸本)9783030642167

This book focuses on how to maintain environmental sustainability as one of its main principles, and it addresses how smart cities serve to diminish wastes and maintain natural resources by having clean green energy that is operated by new smart technology designs. Living in a smart city is not something of the future anymore, it is here, and it is being implemented all over the world. A smart city uses different types of electronic Internet of things (IoT) sensors to collect data and then use these data to manage assets and resources efficiently. The smart city concept integrates information and communication technology (ICT), and various physical devices connected to the IoT network to optimize the efficiency of city operations and services and achieve sustainable solutions to allow us to grow with proper management of our resources.;Smart sustainable structures and infrastructures face the need of urban areas due to the growth of populations while in the same timesave our environment. To achieve this, we need to revisit the conventional methods in design and construction and the conventional materials which are used now to optimize the design and provide smart solutions. In the past few years, the consumption of resources has been massive, and the waste produced from that consumption has been inconceivable. This is causing environmental degradation, which produces many environmental challenges, such as global climate change, excessive fossil fuel dependency and the growing demand for energy.;As well as, discussing the challenges facing the civil engineering design and construction of smart cities components and presenting concepts and insight from experts and researchers from different civil engineering disciplines., this book explains how to construct buildings and special structures and how to manage and monitor energy.

关键词： Earth Sciences, general Geotechnical engineering & Applied Earth Sciences

来源：评论

学校读者我要写书评

暂无评论

Glutaraldehyde removal from produced waters using visible light driven photocatalysis

Glutaraldehyde removal from produced waters using visible li...

引用

Water Environment Federation Technical Exhibition and Conference 2017, WEFTEC 2017

ISBN: (纸本)9781510863682

Glutaraldehyde (GA) is the most common biocide used in unconventional oil and gas production. Photocatalysis of GA in brine simulating oil and gas produced water using Ag/AgCl/BiOCl was investigated. Ag/AgCl/BiOCl photocatalyst was synthesized using flower-like BiOCl. Light bulbs emitting visible light at 419 nm were used for the photocatalysis. Removal of GA at 0.1 mM in 200 g/L NaCl solution at pH 7 was 90% after 75 min irradiation using 5 g/L of the photocatalyst. However, at pH 5 or at 300 g/L NaCl, the photocatalytic removal of GA was almost completely inhibited. The GA removal followed pseudo-first order reaction with a rate constant of 0.0303 min-1. The removal rate of GA markedly increased with the increasing pH (5-9), photocatalyst loading (2-8 g/L) and under 350 nm UV (compared to visible light). On the contrary, the removal rate of GA markedly decreased with increasing NaCl and initial GA concentrations (0-300 g/L for NaCl and 0.1-0.4 mM for GA). The removal of GA under natural sunlight was slightly better than that under 419 nm. A quenching experiment was also conducted;holes and superoxide were found as the main reactive species responsible for the removal of GA while ∗OH had a very limited effect. Copyright © 2017 Water Environment Federation.

关键词： Rate constants

来源：评论

学校读者我要写书评

暂无评论

Analysis and Improvement of altimetric quality of Shuttle Radar Topography Mission data, SRTM-3

Analysis and Improvement of altimetric quality of Shuttle Ra...

引用

33rd International Symposium on Remote Sensing of Environment, ISRSE 2009

作者： Souza, J.M. Nogueira, E. Santa Catarina State Institution for Agricultural Research and Rural Extension Information Centre for Environmental Resources and Hydrometeorology - Epagri Ciram 88034-901 Florianólis Santa-Catarina Brazil Federal University of Santa Catarina - UFSC Civil Engineering Department Post-Graduation Program - PPGEC 88040-900 Florianólis Santa-Catarina Brazil

The quality control of a cartographic product is a highly relevant step in which, for each application there is a tolerance. In this account, this research is intended to perform the quality control of Shuttle Radar Topography Mission - SRTM-3's Digital Elevation Model - DEM, for the Municipal District of São José, Santa Catarina, Brazil, comparing the results obtained between the original DEM from SRTM-3 with the same georeferenced DEM to the local cartographic base in a 1:2000 scale, of São José municipal district. The results revealed that the original SRTM data complies with 1:250000 Class A scale, and that after georeferencing to the local cartographic base, it started to show geometric requirements regarding 1:50000 Class B scale.

关键词： Quality control

来源：评论

学校读者我要写书评

暂无评论

Evaluating Performance of a Proactive Optimal Variable Speed Limit Control Using Different Objective Functions

引用

Procedia - Social and Behavioral Sciences 2013年 96卷 2895-2906页

作者： Md. Hadiuzzaman Jie Fang Ying Luo Tony Z. Qiu Graduate Research Assistant Department of Civil and Environmental Engineering University of Alberta Edmonton T6G 2W2 Canada Post Doctoral Fellow Department of Civil and Environmental Engineering University of Alberta Edmonton T6G 2W2 Canada Assistant Professor Department of Civil and Environmental Engineering University of Alberta Edmonton T6G 2W2 Canada

Proactive optimal Variable Speed Limit (VSL) control is a promising solution to improve both the freeway capacity and the travel time. Despite this well-recognized fact, most of the previous studies found that the VSL control strategy was capable of improving only the freeway travel time. This finding hinders the overall mobility benefits from the computationally intensive proactive optimal VSL control and its credibility compared to the other control strategies those do not involve real-time traffic state prediction and optimization. To resolve this issue, in this paper, the authors adopt a previously developed novel VSL control strategy that explicitly considers traffic characteristics at active bottleneck, and its upstream-downstream links. Then, the performance of the control strategy has been evaluated within a predictive control framework, considering several objective functions (including stand-alone objective and combination of multiple objectives). Moreover, within the control framework, DynaTAM-VSL has been used as a prediction model. To find the optimal values of control variable at each control horizon, the authors adopt the multi-start Sequential Quadratic programming, which starts a local solver from multiple start points. A sensitivity analysis is performed to see how the weight parameters of the partial objectives influence the VSL performance, which resolves existing paradoxical results of VSL mobility benefits. In addition, the model is simulated for a range of demand inputs, and analysis is carried out to see how efficient the VSL control is to improve the freeway mobility.

关键词： Model predictive control variable speed limit capacity drop METANET DynaTAM-VSL

来源：评论

学校读者我要写书评

暂无评论

Handbook of Sustainability Science in the Future 1

Handbook of Sustainability Science in the Future

引用

1000年

作者： Walter Leal Filho Anabela Marisa Azul Federica Doni Amanda Lange Salvia

ISBN: (数字)9783031045608

ISBN: (纸本)9783031045592

Humanity will have to cope with many problems in the coming decades: for instance, the world population is likely grow to to 8,8 billion people by 2035. Also, changing climate conditions are negatively affecting the livelihoods of millions of people. In particular, environmental disasters are causing substantial damages to properties. From a social perspective, the inequalities between rich and poor nations are becoming even deeper, and in many countries, conflicts between national and international interest groups are *** above state of affairs suggest that a broader understanding of the trends which may lead to a more sustainable world is needed, especially those which may pave the way for future developments. In other words, we need to pave the way for sustainable futures. Consistent with this reality, the proposed Encyclopedia of Sustainability Futures aims to identify, document and disseminate ideas, experiences and visions from scientists, member of nongovernmental organisations, decision-makers industry representatives and citizens, on themes and issues which will be important in pursuing sustainable future scenarios. In particular, the publication will focus on scientific aspects, as well as on social and economic ones, also considering matters related to financing and infra-structures, which are important in pursuing a sustainable future. The Encyclopedia of Sustainability Futures will involve the contributing authors in line with the principle of co-generation, from across a wide range of disciplines, e.g. education and social sciences, natural sciences, engineering, the arts, languages etc, with papers adopting a long-term sustainability perspective, with a time horizon until 2050. The focus will be on themes which are felt as important in the future, and the chapters are expected to interest and motivate a world audience. This book is part of the "100 papers to accelerate the implementation of the UN Sustainable Development Goals initiative"

关键词： Sustainable Development environmental and Sustainability Education Geography, general

来源：评论

学校读者我要写书评

暂无评论

Assessing the Performance of Machine Learning Algorithms for Water Level Prediction in the Chao Phraya River and its Tributaries: A Focus on Low and High Water Levels

SSRN

引用

SSRN 2024年

作者： Priyasiri, Wilmat D.S.M. Rittima, Areeya Kraisangka, Jidapa Sawangphol, Wudhichart Phankamolsil, Yutthana Talaluxmana, Yutthana Graduate Program in Environmental and Water Resources Engineering Department of Civil and Environmental Engineering Faculty of Engineering Mahidol University Thailand Faculty of Information and Communication Technology Mahidol University Thailand Environmental Engineering and Disaster Management Program Mahidol University Kanchanaburi Campus Thailand Department of Water Resources Engineering Faculty of Engineering Kasetsart University Thailand

High precision of hydrological prediction is crucial for real–time operation of flood and drought risk mitigation and strategic planning. This study assessed the predictive performances of three Machine Learning (ML) algorithms;XGBoost, Random Forest (RF), and Multi–Layer Neural Networks (MLNNs) for water level prediction with a focus on low and high water levels. The one–day and one–week water level prediction models for six key gauged stations along the Chao Phraya River and its major tributaries were accordingly developed. Selecting the combination of input features was carried out and structured in the prediction model at all gauged stations based on the physical river–reservoir system using past water level, rainfall, controlled reservoir outflow, and upstream discharges with different travel times. The statistical evaluation indicated that both XGBoost and RF, the tree–based ML models, with rainfall input robustly outperformed than MLNNs, as it strongly achieved higher R2 from 0.957 to 0.999 for model training and from 0.743 to 0.995 for model testing and lower MAE, MSE, and RMSE values for all prediction scenarios. Among these three ML algorithms applied for daily prediction, RF demonstrated the superior performance for low water level prediction exhibiting the smallest percentage error of overestimating lying between +0.0088% and +0.9380%. XGBoost, RF, and MLNNs, demonstrated acceptable performance level for high water level prediction as it shows small percentage error of both overestimating and underestimating lying between –2.2696% and +1.1587%. Additionally, it can capture the entire testing dataset with high precision than weekly model. © 2024, The Authors. All rights reserved.

关键词： Rain

来源：评论

学校读者我要写书评

暂无评论

Blank slate engineering at Florida Gulf Coast University - Innovative and multidisciplinary from the ground up

Blank slate engineering at Florida Gulf Coast University - I...

引用

113th Annual ASEE Conference and Exposition, 2006

作者： Blanchard, Susan Egiebor, Nosa Sweeney, James Zidek, Lisa Sechrist, Chalmers Hulbert, Sam Osborn, James O'Neill, Robert Florida Gulf Coast University United States FGCU School of Engineering Institute of Electrical and Electronics Engineers Biomedical Engineering Society American Institute for Medical and Biological Engineering United Kingdom Department of Environmental and Civil Engineering Arizona State University United States Department of Bioengineering Department of Bioengineering Arizona State University United States Flinn Foundation Funded Multi- and Interdisciplinary Graduate Training Program in Bioengineering Milwaukee School of Engineering United States Graduate Programs Industrial Engineering Program Department of Electrical and Computer Engineering Department of Engineering University of Illinois Urbana-Champaign United States Institute of Electrical and Electronics Engineers Rose-Hulman Institute for Technology School of Engineering FGCU School of Engineering's Advisory Board Roger Williams University United States Department of Civil Engineering Department of Engineering Roger Williams University United States

No abstract available

关键词：

来源：评论

学校读者我要写书评

暂无评论

Simulation of multilayer shallow water fluid flow using lattice boltzmann modeling and high performance computing

Simulation of multilayer shallow water fluid flow using latt...

引用

World environmental and Water Resources Congress 2009: Great Rivers

作者： Tubbs, K.R. Tsai, F.T.-C. Donald W. Clayton Graduate Program in Engineering Science Louisiana State University 351 Johnston Hall Baton Rouge LA 70803 United States Department of Civil and Environmental Engineering Louisiana State University 3418G Patrick F. Taylor Hall Baton Rouge LA 70803-6405 United States

ISBN: (纸本)9780784410363

A lattice Boltzmann method (LBM) on high performance computing (HPC) environments for three-dimensional shallow water flow fields is developed. Recently, the LBM has become an attractive numerical method to solve various fluid dynamics phenomena. However, LBM has not been extensively applied to shallow water equations. The shallow water equations have wide applications in ocean and hydraulic engineering which can benefit from the advantages of the LBM. The standard LBM for two dimensional shallow water flows is extended to three dimensional flows by solving the multilayer shallow water equations. LBM is an attractive method for solving the multilayered shallow water equations because the extension to a multilayer formulation is straight forward and all simplicities and advantages of the LBM are retained. The performance of the LBM for the multilayer shallow water equations is investigated and optimized in HPC environments. We numerically demonstrate the applicability of the LBM in three dimensional shallow water flows and the LBM performance using OpenMP. © 2009 ASCE.

关键词： Multilayers

来源：评论

学校读者我要写书评

暂无评论

A weekend STEM enrichment program for tribal high school teachers and students

A weekend STEM enrichment program for tribal high school tea...

引用

113th Annual ASEE Conference and Exposition, 2006

作者： Padmanabhan, G. Lin, Wei Pieri, Robert Patterson, Floyd Khan, Eakalak North Dakota State University United States Department of Civil Engineering North Dakota State University United States North Dakota Water Resources Research Institute United States ASEE American Society of Civil Engineers United States Department of Environmental Engineering North Dakota State University United States Interdisciplinary Environmental and Conservation Sciences Graduate Program United States NDSU United States Department of Mechanical Engineering North Dakota State University United States Department of Electrical Engineering North Dakota State University United States

Attracting high school students to college engineering programs has been recognized as a challenge by several engineering organizations. One of the reasons for the low percentage enrolment of high school graduates into engineering programs is that many math/science teachers and counselors lack understanding of engineering applications within the subjects they teach and prospects associated with engineering careers. The instruction at the school level is often criticized for not adequately emphasizing science and mathematics, especially connections with engineering applications. Many students have difficulty connecting math and science courses to common phenomena seen all around and to future careers. This problem is further aggravated on Indian reservations in North Dakota because of their isolated locations and distance from industries. The authors developed a weekend academic program, "Sunday Academy", carried out on four North Dakota Indian reservations, to stimulate Native American students' interest in science, technology, engineering, and mathematics (STEM), to attract to engineering programs, and to engage high school teachers and tribal college instructors in the process of developing engineering and applied science lesson plans. The academy consisted of a series of one-day academic sessions presented monthly to junior and senior high school students. The lesson plans for the sessions were developed collaboratively by a group of university and community college faculty and high school teachers. This project provided unique opportunities for engineering professors to work with high school students directly, to familiarize high school teachers and tribal college instructors with engineering concepts and approaches, and to be knowledgeable about and sensitive to Indian culture. To make it a successful program, the authors had to overcome various challenges, including selection of lesson topics and hands-on activities that are interesting and suitable for the st

关键词： engineering education

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：