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Non-destructive evaluation of a city roadway for pavement rehabilitation: A case study

International Journal of Pavement Research and technology 2017年第7期11卷 667-678页

作者： Chao, Chien-Chiao Lin, Deng-Fong Luo, Huan-Lin Wang, Yu-Kai Lo, Wei Ph. D. Program in Engineering Science and Technology College of Engineering National Kaohsiung First University of Science and Technology Kaohsiung City Taiwan Department of Civil and Ecological Engineering I-Shou University Kaohsiung City Taiwan Department of Construction Engineering National Kaohsiung First University of Science and Technology Kaohsiung City Taiwan

In this study, a pavement evaluation was carried out on a corridor that carried heavy truck traffic, connecting a harbor, a major high-way, an airport, and industries. The pavement of the corridor was distressed frequently, requiring constant maintenance. With tight maintenance budget and intention to minimize the effects on traffic, full reconstruction or major rehabilitation of the corridor was not practical. To develop proper pavement rehabilitation design within the practical constrains, pavement evaluation was performed in this study using non-destructive techniques, such as visual condition survey, falling weight deflectometer (FWD), ground penetrating radar (GPR), and dynamic cone penetrometer (DCP), and pavement coring. It is demonstrated that appropriate pavement rehabilitation design can be developed to offer practical solution to the repair/maintenance for city streets. © 2017 Chinese Society of Pavement engineering.

关键词： Ground penetrating radar systems

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Applicability of zirconium loaded okara in the removal and recovery of phosphorus from municipal wastewater

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IOP Conference Series. Earth and Environmental Science 2019年第1期266卷 012004-012004页

作者： Nguyen, T A H Ngo, H H Guo, W S Pham, T Q Cao, T H Nguyen, T H H Master’s Program in Environmental Engineering VNU Vietnam Japan University Luu Huu Phuoc My Dinh 1 residential area Nam Tu Liem Hanoi Vietnam Centre for Technology in Water and Wastewater School of Civil and Environmental Engineering University of Technology Sydney (UTS) 15 Broadway Ultimo NSW 2007 Australia Graduate University of Science and Technology Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Cau Giay Hanoi Vietnam Faculty of Geology VNU University of Science 334 Nguyen Trai Thanh Xuan Hanoi Vietnam

Recently, there is a new trend to consider wastewater as a precious resource. Since phosphorus is a limited non-renewable element, and MAP (Magnesium Ammonium Phosphate - MgNH4PO4.6H2O) is a valuable slow-release fertilizer, the recovery of phosphorous as MAP has received special attention from scientists all over the world. However, the application of this process with municipal wastewater is still a challenge, due to low concentration of phosphorus and high volume of municipal wastewater. This study investigates the potential of reclaiming MAP from municipal wastewater by combination of adsorption and crystallization. Soybean milk residue (okara) was loaded with Zirconium (Zr) to prepare the adsorbent (ZLO). Adsorption and desorption experiments were conducted in a semi-pilot scale ZLO packed colum system. Effects of P: N: Mg molar ratios, chemical sources and temperature on the formation of MAP were examined in an attempt to identify the optimal crystallization conditions. The attained precipitate was characterized using XRD, SEM, FTIR techniques. It was found that the ZLO packed column adsorption-desorption system could pre-concentrate phosphorus from municipal wastewater up to 28.36 times, fitting well the minimum requirement (50 mg P/L) for the economical MAP recovery. Up to 95.19% of dissolved phosphorus in desorption solution was recovered at pH = 9, Mg: N: P molar ratio = 2:2:1, using a combination of MgCl2.6H2O and NH4Cl. The harvested MAP exhibited high purity (92.59%), high P-availability (89% by mass), and extremely low levels of heavy metals. The results prove that it is viable to recover MAP from municipal wastewater by employing ZLO as adsorbent, followed by crystallization. This paves the way for mining phosphorus from municipal wastewater and reducing okara as an agricultural byproduct in a green way.

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Cure monitoring and characterization of epoxy/amine networks, modified with 1-butyl-3-bethylimidazolium tetrafluoroborate ionic liquid 32

Cure monitoring and characterization of epoxy/amine networks...

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32nd Technical Conference of the American Society for Composites 2017

作者： Prozorovska, Liudmyla Muralidharan, Nitin Westover, Andrew Pint, Cary Adams, Douglas Department of Civil and Environmental Engineering Vanderbilt University NashvilleTN37235 United States Interdisciplinary Materials Science Program Vanderbilt University NashvilleTN37225 United States Department of Mechanical Engineering Vanderbilt University NashvilleTN37235 United States Material Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States

ISBN: (纸本)9781510853065

In the present work, electrochemical impedance spectroscopy (EIS) was employed for cure monitoring of bisphenol A/F based epoxy resin-polyoxypropylenediamine hardener systems modified with various concentrations of 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4) ionic liquid (IL). These systems exhibited phase separation induced by an increase in the molar mass through the curing of the resin. The progress of the curing process was accompanied by a steady increase of impedance for all types of samples, as expected, due to the increasing viscosity of the medium for increased degree of cure. The results were compared to those of unmodified resin-hardener systems. The sensitivity of EIS as a cure monitoring technique increased dramatically with the addition of the IL. The cure kinetics of the epoxy resin was characterized by differential scanning calorimetry and the data were used to create a model for comparison with the EIS results. The change of the ionic conductivity during curing as a function of IL concentration and the effect of IL loading on mechanical properties of the resin were also studied. We demonstrate that [BMIM]BF4 loading of 5wt.% increased the room temperature ionic conductivity of the fully cured product by an order of magnitude with only a 2.5% reduction in compression strength from that of pure epoxy. Copyright © (2017) by DEStech Publications, Inc. All rights reserved.

关键词： Epoxy resins

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Innentitelbild: Diels–Alder Conversion of Acrylic Acid and 2,5-Dimethylfuran topara-Xylene Over Heterogeneous Bi-BTC Metal-Organic Framework Catalysts Under Mild Conditions (Angew. Chem. 2/2021)

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Angewandte Chemie 2020年第2期133卷

作者： Jyun-Yi Yeh Season S. Chen Shih-Cheng Li Celine H. Chen Dr. Tetsuya Shishido Dr. Daniel C. W. Tsang Dr. Yusuke Yamauchi Yi-Pei Li Prof. Kevin C.-W. Wu International Graduate Program of Molecular Science and Technology (NTU-MST) National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan Taiwan International Graduate Program (TIGP) Academia Sinica No. 128 Sec. 2 Academia Road Taipei 11529 Taiwan Department of Chemical Engineering National (Taiwan) University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan School of Engineering Brown University Providence RI 02912 USA Department of Applied Chemistry for Environment Tokyo Metropolitan University 1-1 Minami-osawa Hachioji Tokyo 192-0397 Japan Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong China JST-ERATO Yamauchi Materials Space-Tectonics Project Kagami Memorial Research Institute for Materials Science and Technology Waseda University 2-8-26 Nishiwaseda Shinjuku-ku Tokyo 169-0051 Japan Australian Institute for Bioengineering and Nanotechnology (AIBN) School of Chemical Engieering The University of Queensland Brisbane QLD 4072 Australia Center of Atomic Initiative for New Materials National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan

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Inside Cover: Diels–Alder Conversion of Acrylic Acid and 2,5-Dimethylfuran topara-Xylene Over Heterogeneous Bi-BTC Metal-Organic Framework Catalysts Under Mild Conditions (Angew. Chem. Int. Ed. 2/2021)

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Angewandte Chemie International Edition 2020年第2期60卷

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Diels–Alder Conversion of Acrylic Acid and 2,5-Dimethylfuran topara-Xylene Over Heterogeneous Bi-BTC Metal-Organic Framework Catalysts Under Mild Conditions

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Angewandte Chemie 2020年第2期133卷

The heterogeneous metal-organic framework Bi-BTC successfully catalyzed the synthesis of para -xylene from bio-based 2,5-dimethylfuran and acrylic acid in a promising yield (92 %), under relatively mild conditions (160 °C, 10 bar), and with a low reaction-energy barrier (47.3 kJ mol −1 ). The proposed reaction strategy also demonstrates a remarkable versatility for furan derivatives such as furan and 2-methylfuran.

关键词： 2,5-dimethylfuran acrylic acid Bi-BTC metal-organic frameworks para-xylene

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River water pollution condition in upper part of Brantas River and Bengawan Solo River

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IOP Conference Series: Earth and Environmental Science 2018年第1期106卷

作者： D Roosmini M A Septiono N E Putri H M Shabrina I R S Salami H D Ariesyady Environmental Technology and Management Research Group Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Bandung Indonesia Bali Fokus Foundation Sesetan Denpasar Bali Indonesia Undergraduate Program of Environmental Engineering Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Bandung Indonesia

Wastewater and solid waste from both domestic and industry have been known to give burden on river water quality. Most of river water quality problem in Indonesia has start in the upper part of river due to anthropogenic activities, due to inappropriate land use management including the poor wastewater infrastructure. Base on Upper Citarum River Water pollution problem, it is interesting to study the other main river in Java Island. Bengawan Solo River and Brantas River were chosen as the sample in this study. Parameters assessed in this study are as follows: TSS, TDS, pH, DO, and hexavalent chromium. The status of river water quality are assess using STORET method. Based on (five) parameters, STORET value showed that in Brantas River, Pagerluyung monitoring point had the worst quality relatively compared to other monitoring point in Brantas River with exceeding copper, lead and tin compared to the stream standard in East Java Provincial Regulation No. 2 in 2008. Brantas River was categorized as lightly polluted river based on monitoring period 2011-2015 in 5 monitoring points, namely Pendem, Sengguruh, Kademangan, Meritjan and Kertosono.

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The Influence of Sediment Loads on the Irrigation Discharge in The Upstream and Downstream of the Major River in Banyuwangi Regency

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IOP Conference Series: Earth and Environmental Science 2018年第1期207卷

作者： Z Erwanto D Dwi Pranowo D S W P J Widakdo N S R Wilujeng Department of Civil Engineering Politeknik Negeri Banyuwangi Banyuwangi Indonesia Study Program of Agribusiness Politeknik Negeri Banyuwangi Banyuwangi Indonesia Study Program of Animal Product Processing Technology Politeknik Negeri Banyuwangi Banyuwangi Indonesia

In Banyuwangi Regency there are four major rivers include the Tambong, Bomo, Setail and Baru river. Those rivers often overflow due to the high sediment deposition in the weir. The purpose of the study is to determine the influence of sediment loads upstream and downstream of the four rivers on irrigation impact. Suspended load analysis used method of Engelund and Hansen; Einstein; and Chang Simons & Richardson. Bed load analysis using methods of the Meyer-peter; Duboys; and Shields. Loads of sediment, both suspended load and bed load on the irrigation discharge in both the upstream and downstream of the major rivers in Banyuwangi greatly influences the sedimentation of irrigation channels which affect on fluctuations of irrigation discharge to irrigate land of Agriculture. The Baru River carried the largest sediment load in irrigation intake of Karangdoro Weir that carried Qs of 385.96 tons/year and Qb of 6.37 tons/year. It is necessary to have policies and efforts to control sediment and study about the maintenance of weirs periodically to maintain the volume of irrigation water so that it can increase agricultural productivity in Banyuwangi Regency.

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Toward a chaotic adjoint for LES

arXiv

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arXiv 2017年

作者： Blonigan, P.J. Fernandez, P. Murman, S.M. Wang, Q. Rigask, G. Magri, L. NASA Postdoctoral Program Universities Space Research Association Department of Aeronautics and Astronautics MIT NASA Ames Research Center Department of Mechanical and Civil Engineering Califonia Institute of Technology

Adjoint-based sensitivity analysis methods are powerful tools for engineers who use flow simulations for design. However, the conventional adjoint method breaks down for scale-resolving simulations like large-eddy simulation (LES) or direct numerical simulation (DNS), which exhibit the chaotic dynamics inherent in turbulent flows. Sensitivity analysis based on least-squares shadowing (LSS) avoids the issues encountered by conventional methods, but has a high computational cost. The following report outlines a new, more computationally efficient formulation of LSS, non-intrusive LSS, and estimates its cost for several canonical flows using Lyapunov analysis. Copyright © 2017, The Authors. All rights reserved.

关键词： Large eddy simulation

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Antibiotics and antibiotic resistant bacteria and genes in northeastern dairy manure management systems - Project overview and preliminary findings from an 11 farm case study

Antibiotics and antibiotic resistant bacteria and genes in n...

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2017 ASABE Annual International Meeting

作者： Oliver, Jason P. Schueler, Jenna Hurst, Jerod Crossette, Emily Langenfeld, Kathryn Gooch, Curt Lansing, Stephanie Felton, Gary Wigginton, Krista Raskin, Lutgarde Sassoubre, Lauren Aga, Diana Cornell University Department of Animal Science PRO-DAIRY Dairy Environmental Systems Program IthacaNY14850 United States University of Maryland Dept. Environmental Science and Technology College ParkMD20742 United States Department of Chemistry BuffaloNY14260 United States University of Michigan Department of Civil and Environmental Engineering Ann ArborMI48109 United States University at Buffalo State University of New York-Buffalo Department of Civil Structural and Environmental Engineering BuffaloNY14260 United States

Modern U.S. dairies use antibiotics primarily for disease treatment and prevention. Consequently, antibiotic residues, antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARG) present in dairy manure may potentially enter the environment and contribute to the spread of antibiotic resistance (AR). Working cooperatively with 11 production dairies in three states (NY, PA, MD) our objective is to investigate the efficacy of existing on-farm manure management practices (e.g. long-term storage, composting, anaerobic digestion, etc.) at mitigating these potential contaminants. At each farm manure system performance is being assesses, antibiotic usage is being tracked, and manure samples are being collected at roughly 6-week intervals over 2-years pre- and post-each treatment step of the various manure handling systems. Samples are being analyzed for tetracycline, sulfonamide and macrolide antibiotic residues. Additionally, using culturing techniques and qPCR, ARB in manure solids before and after treatment are being quantified to study the effectiveness of bedding recovery systems at mitigating ARB pathogens. Select samples are also being analyzed for their diversity and abundance of ARGs. Preliminary data shows variable mitigation potentials of the different manure handling systems and is improving our understanding of the fate of these potential contaminants in dairy manures. As the project advances the efficacy of specific treatment systems to mitigate AR will be tested and knowledge on the fate of AR in dairy manure management systems will be extended to the dairy industry.

关键词： Manures

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