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Spatial pattern of sediment transport for analysis of precipitation direction and magnitude in the upper Lematang river sub-basin

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IOP Conference Series: Earth and environmental Science 2019年第1期389卷

作者： Sarino Agus Lestari Yuono DA Putranto Dinar Civil Engineering and Planning Study Program Faculty of Engineering University of Sriwijaya. Jl. Raya Inderalaya Km. 32 Inderalaya Ogan Ilir Regency South Sumatera Province Indonesia Civil Engineering Post Graduate Study Program Faculty of Engineering University of Sriwijaya. Jl. R. Soeprapto Bukit Besar Palembang City South Sumatera Province Indonesia

The high level of erosion that occur in Musi river basin has improved a tremendous impact on sedimentation in downstream areas and has resulted in many infrastructure of water is disturbed, such as silting of irrigation channels, siltation of rivers which disrupt the flow of transport stream and increasing the risk of flooding, high sedimentation in the port basin, low quality of water and the rising costs of water treatment. This study utilizes techniques terrain models Digital (Digital Elevation Model/DEM) to analysis the spatial distribution of the potential for erosion and sources of sedimentation, as well as the direction of the flow of sediment into channels as well as its relationship with outlet in branching river as the supplies to be sediment to the river flow. The method used in this study using a spatial model analysis with the help of GIS in analysing and presenting the level of erosion and deposition by utilizing modelling slope and kinetic energy of rainfall to estimate the index erosivity and distribution pattern of sediment into the river channel. This research was conducted at the upper Lematang river sub basin with area 412,638 Ha, which are classified into 11 sub-chatments with the highest altitude is 3.159 m above sea level (Dempo Valley) and the lowest is 126 m above sea level (Talang tinggi Valley). Analytical results have been tested by taking a fine sediment sampling in each sub-watershed in the analysis and is taken along the channel network and compare the observed patterns with the results predicted by the model analysis of soil erosion. Overall, erosion by high intensity tends to occur in the relationship between the different vegetation coverage, the barren land and open land used for farms and land used for mining. Approximately 45-65.5% slope bad condition because the vegetation has been open, so it can be seen the amount of erosion in the area is 2.139 ton/ha/year, at the sloping is 1.8239 ton / ha / year

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Free vibration of orthotropic Levy-type solution plates by using SEM

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IOP Conference Series: Materials Science and engineering 2019年第1期615卷

作者： S Kiryu S W Alisjahbana I Alisjahbana A L Han B S Gan Department of Architecture Graduate School of Engineering Nihon University Koriyama Japan Faculty of Engineering and Informatics Bakrie University Jakarta Indonesia Department of Civil and Environmental Engineering Master Program Student Stanford University California USA Civil Engineering Department Faculty of Engineering Universitas Diponegoro Semarang Indonesia Department of Architecture College of Engineering Nihon University Koriyama Japan

Orthotropic Levy-type solution plates considering shear deformation were solved by using the Spectral Element Method (SEM). In SEM, the exact solution of structural dynamic related problems can be solved by using the frequency-dependent shape functions. The solutions of SEM are accurate in decreasing the amount of Degree Of Freedoms (DOF) to discard the cost and computational disadvantages in the Finite Element Method (FEM). This study investigates the free vibration problems of orthotropic Levy-type solution plates solutions based on the two variable Refined Plate Theory (RPT). SEM for orthotropic Levy-type solution plates in the frequency domain was formulated to solve free vibration problems. The differential governing equations of the orthotropic plate element in SEM are formulated into the form of transcendental stiffness matrices. The boundary conditions of the spectral element model consist of four edge-type DOFs at each side of the orthotropic Levy-type solution plates. The natural frequencies of the plate are calculated by means of the Wittrick-Williams procedure. The numerical investigations are presented to show the accuracy, efficiency, and effectiveness of SEM without any discretization scheme.

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Physical Characteristics of Modified Cassava Flour Wastewater at Room Temperature

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IOP Conference Series: Earth and environmental Science 2019年第1期292卷

作者： N Yaqin A N Al-Baarri A M Legowo Widayat M A Budihardjo Program of Environmental Science School of Post Graduate Studies Diponegoro University Semarang Indonesia Center of Research and Services-Diponegoro University Semarang Indonesia Food Technology Department Faculty of Animal and Agricultural Sciences Diponegoro University Semarang Indonesia Chemical Engineering Department Faculty of Engineering Diponegoro University Semarang Indonesia Department of Environmental Engineering Faculty of Engineering Diponegoro University Indonesia

Cassava is an agricultural material that is considered as important raw resources in the industrial sector. The benefits are even greater after being modified using lactic acid bacteria. However, the mocaf industry often causes water and air pollution. environmental problems arise after the fermentation process. Determination problems with lightness, TDS (Total Dissolved Solid), conductivity and pH analysis are required to measure the impact to the environment. This research was used waste water from mocaf during 3 days fermentation. The wastewater had the highest color level (Lightness) on initial day of fermentation at 83.7±3.73 and then decrease along the day of fermentation at the averages of 65.2±2.0. The highest TDS was resulted from the mocaf wastewater at a value of 1218 ± 4.6 ppm which continued to decline until day 4. The conductivity and pH showed a decrease along the day of fermentation. As conclusion, physical characteristic of wastewater from mocaf production could be analyzed specifically and determined through color, TDS, conductivity, and pH.

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Food security in the aftermath of a seismic event 11

Food security in the aftermath of a seismic event

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11th National Conference on Earthquake engineering 2018: Integrating Science, engineering, and Policy, NCEE 2018

作者： Zhao, X. Chodur, G. Biehl, E. Neff, R. Mitrani-Reiser, J. Dept. of Industrial and Operations Engineering University of Michigan Ann ArborMI48109 United States Graduate Group in Nutritional Biology University of California DavisCA95616 United States Center for a Livable Future Johns Hopkins Bloomberg School of Public Health BaltimoreMD21205 United States Dept. of Environmental Health and Engineering Johns Hopkins Bloomberg School of Public Health BaltimoreMD21205 United States Disaster and Failure Studies Program NIST GaithersburgMD20899 United States Dept. of Civil Engineering Johns Hopkins University BaltimoreMD21218 United States

ISBN: (纸本)9781510873254

California's farmlands yield a significant proportion of produce for the entire nation. An acute event, such as an earthquake, tornado, or wildfire, can severely disrupt food production in California, which may impact local and national food security. Additionally, a long-term event (e.g., drought) occurring in California may further decrease food production in the region when coupled with an earthquake. Therefore, this paper proposes to analyze the food production failure mechanism, conditioned on a major earthquake striking southern California, by using the 2008 Great Southern California ShakeOut scenario (which is based on a potential magnitude 7.8 earthquake on the southern San Andreas Fault). Furthermore, California has experienced a historic drought since 2011, characterized by frequent wildfires and dying forests. Hence, we also assess the food production failures from an earthquake coupled with a drought. Food production failure in both scenarios (i.e., an earthquake and an earthquake coupled with a drought) will be assessed using fault tree analysis (FTA). FTA is a top-down deductive risk assessment tool, which is structured with an overall system "failure" on the top (in this case food production failure), and beneath it, all of the intermediate and basic events that could cause failures. We adapted a fault tree model developed by the co-authors for the food system in Baltimore City to the food system in southern California. This resulting food-production failure assessment model may serve as a decision-support tool for stakeholders to facilitate planning for resilient food systems. Copyright © NCEE 2018: Integrating Science, engineering, and *** rights reserved.

关键词： Earthquakes

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Operational Characteristics of a Geologic CO2 Storage Bulk Energy Storage Technology 14

Operational Characteristics of a Geologic CO2 Storage Bulk E...

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14th International Conference on Greenhouse Gas Control Technologies, GHGT 2018

作者： Ogland-Hand, Jonathan D. Miranda, Marcos W. Bielicki, Jeffrey M. Adams, Benjamin M. Buscheck, Thomas A. Saar, Martin O. Environmental Science Graduate Program The Ohio State University 174 West 18th ColumbusOH43210 United States Department of Civil Environmental and Geodetic Engineering The Ohio State University 2070 Neil Avenue ColumbusOH43210 United States John Glenn College of Public Affairs The Ohio State University 1810 College Road ColumbusOH43210 United States Geothermal Energy and Geofluids Group Department of Earth Sciences ETH-Zurich Sonneggstrasse 5 Zurich8092 Switzerland Atmospheric Earth and Energy Division Physical and Life Sciences Directorate Lawrence Livermore National Laboratory LivermoreCA94550 United States

Carbon dioxide-Bulk Energy Storage (CO2-BES) is a bulk energy storage technology that uses carbon dioxide (CO2) in sedimentary basin geothermal resources to time-shift electricity production. Here, we investigated how the charging and discharging cycles affect the power storage capacity and power output capacity of a CO2-BES facility. We simulated the operation of CO2-BES with seven different operating cycles for fourteen years. Our results suggest that continuous charging and discharging cycles do not change the rate of heat depletion of the geothermal resource. But the power storage capacity and the power output capacity are affected because they rely on the magnitude of the overpressure. If, in a cycle, the duration of electricity dispatch is greater than the duration of electricity storage, overpressure may eventually deplete and a CO2-BES facility may cease to be operational. If idle periods where electricity is neither charged nor discharged are included in the cycle, there is a small increase in power output capacity and a small decrease in power storage capacity. In general, if electricity is dispatched and stored for equal amounts of time, the duration of dispatch/storage and of the idle period does not affect the power output capacity or the power storage capacity. As a result, as long as the cycles consist of equivalent charging and discharging durations throughout the lifetime of the facility, the length of those durations and frequency of idle periods could be based on financial incentives (e.g., diurnal variations in electricity prices), rather than process-level factors like the potential for heat or pressure depletion. © 2018 GHGT 2018 - 14th International Conference on Greenhouse Gas Control Technologies. All rights reserved.

关键词： Carbon dioxide

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Conceptual Design of Mobile Application for post-disaster Rapid Assessment of Damaged Houses

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IOP Conference Series: Earth and environmental Science 2019年第1期273卷

作者： I Setyawati K Munadi Y Idris Syamsidik S Muchallil Post Graduate of Disaster Science Program Syiah Kuala University Banda Aceh Indonesia Tsunami and Disaster Mitigation Research Center (TDMRC) Syiah Kuala University Banda Aceh Indonesia Electrical and Computer Engineering Department Syiah Kuala University Banda Aceh Indonesia Civil Engineering Department Syiah Kuala University Banda Aceh Indonesia

The current rapid assessment of post-earthquake damaged houses has been done manually. The determination of the damage level is also very subjective. Moreover, the available time during a rapid assessment and limited number of enumerators lead to ineffective decisions for responses and assistances. There are several application had appeared trying to answer the problems, but still they have many types of data that need to be input and even need a lot of time to process. The system design to be simple, more user-friendly and time efficient to be operated during the assessment. This study is aimed to develop a conceptual design of a system to collect data of houses damaged by earthquake using mobile application which propose to work both online and offline. The system will consists of five components: mobile device, user, data center (web server and database), internet, and data processing center (administrator and manager to verify and analyze the data). The application design to be integrated with Google Maps containing concise data entry to facilitate users (trained users and common users) and to shorten the time of data collection. Final collected data will be presented through the website and perform descriptive and spatial analysis.

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12.06: Numerical analysis of stainless steel, concrete encased and carbon steel double skin tubular stub columns

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ce/papers 2017年第2-3期1卷 3509-3518页

作者： de Araújo, Raphaella Oliveira de Lima, Luciano Rodrigues Ornelas da Silva Vellasco, Pedro Colmar Gonçalves da Silva, André Tenchini PGECIV – Civil Engineering Post-Graduate Program State of Rio de Janeiro – UERJ Brazil Structural Engineering Department State University of Rio de Janeiro – UERJ Brazil

The use of stainless steel as formwork for concrete columns provides several benefits for the structure, including the high corrosion resistance, durability, fire resistance, ease of maintenance and high aesthetic value. The use of composite systems in columns has been a major breakthrough in bridges and viaducts. A particular advantage of the composite columns is the reduction of cross sectional area, speed of construction, easy maintenance and material saving when compared to conventional reinforced concrete structures. These advantages are related to the idea that the columns are concrete filled eliminating the use of forms and the need for extra steel reinforcing bars. The investigated system adopts a second carbon steel tube inside the primary stainless steel tube composing the structural system made of concrete-filled double skin composite tube columns (CFDSCT). This study aims to develop numerical models, using the finite element method and considering geometric imperfections. The structural behaviour was assessed through a nonlinear analysis and was later compared to compressive tests performed in the laboratory. After the completion of the numerical models calibration, a parametric analysis was performed to investigate the influence of parameters like the diameter, thickness and height of the stainless steel tube (outer) while its results were also compared to predictions made by traditional design equations. © Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

关键词： Stainless steel

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Structural performance of stainless lap bolted joints

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ce/papers 2017年第2-3期1卷 3593-3602页

作者： Freire, Raphael da Silva Vellasco, Pedro Colmar Gonçalves da Silva, André Tenchini de Lima, Luciano Rodrigues Ornelas PGECIV – Civil Engineering Post-Graduate Program State of Rio de Janeiro – UERJ Brazil Structural Engineering Department State University of Rio de Janeiro – UERJ Brazil

The stainless steel employed in the structural elements present high corrosion resistance, durability, fire resistance and high aesthetic value compared to those constructed using carbon steel. In contrast, the stainless steel structures design is made following the requirements based on the carbon steel analogies. In fact, the structural performance of stainless steel is complex and dissimilar where some stainless grades presenting nonlinear tension versus strain curves without a defined yield plateau and large strain hardening. These properties influence on structural performance of the lap bolted joints. The Eurocode 3 pt. 1.4, one of the most adopted design codes, recommends two structural design criteria for the stainless steel elements under tension: ultimate resistance of the net cross-section at holes or plastic resistance of the gross cross-section. The present work aimed to investigate the structural response of lap bolted joints made of three stainless steel grades: austenitic, ferritic and duplex. Nonlinear numerical analyses has been carried out using ABAQUS 6.14 program where the response have shown a good agreement in terms of the maximum loads and failure modes when compared to the performed experiments. The results indicated a conservative level of safety from Eurocode 3 pt. 1.4 code provisions in comparison to the experimental results. © 2017 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

关键词： Finite element method

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Author Correction: Towards symbiotic approaches between universities, sustainable development, and cities

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Scientific reports 2023年第1期13卷 552页

作者： Walter Leal Filho Liliana Caughman Maria Alzira Pimenta Dinis Fernanda Frankenberger Anabela Marisa Azul Amanda Lange Salvia Department of Natural Sciences Manchester Metropolitan University Chester Street Manchester M115GD UK. Research and Transfer Centre "Sustainable Development and Climate Change Management" Hamburg University of Applied Sciences Ulmenliet 20 21033 Hamburg Germany. Postdoctoral Research Scholar Earth Systems Science for the Anthropocene Arizona State University Tempe USA. UFP Energy Environment and Health Research Unit (FP-ENAS) University Fernando Pessoa (UFP) Praça 9 de Abril 349 4249-004 Porto Portugal. Business School PUCPR Pontifical Catholic University of Paraná Rua Imaculada Conceição Curitiba 1155 Brazil. Brazil Business School Universidade Positivo Rua Pedro Viriato Parigot de Souza Curitiba 5300 Brazil. CNC-Center for Neuroscience and Cell Biology University of Coimbra 3004-504 Coimbra Portugal. CIBB-Center for Innovative Biomedicine and Biotechnology University of Coimbra Coimbra Portugal. IIIUC-Institute for Interdisciplinary Research University of Coimbra 3030-789 Coimbra Portugal. Graduate Program in Civil and Environmental Engineering University of Passo Fundo Campus I - BR285 São José Passo Fundo RS 99052-900 Brazil. amandasalvia@***. European School of Sustainability Science and Research Hamburg University of Applied Sciences Ulmenliet 20 21033 Hamburg Germany. amandasalvia@***.

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Glutaraldehyde removal from produced waters using visible light driven photocatalysis

Glutaraldehyde removal from produced waters using visible li...

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Water Environment Federation Technical Exhibition and Conference 2017, WEFTEC 2017

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)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

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