Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Transportation Engineering (5)
- Construction Engineering and Management (4)
- Environmental Engineering (3)
- Hydraulic Engineering (2)
- Other Civil and Environmental Engineering (2)
-
- Structural Engineering (2)
- Communication (1)
- Communication Technology and New Media (1)
- Computational Engineering (1)
- Computational Linguistics (1)
- Computer Engineering (1)
- Computer and Systems Architecture (1)
- Digital Communications and Networking (1)
- Linguistics (1)
- Social Justice (1)
- Social and Behavioral Sciences (1)
- Urban Studies and Planning (1)
- Keyword
-
- Machine learning (7)
- Rutting (6)
- Sustainability (6)
- Condition assessment (5)
- Finite element analysis (5)
-
- Life cycle assessment (5)
- Recycled plastic pins (5)
- ABAQUS (4)
- Liquefaction (4)
- Pavement (4)
- Shear strength (4)
- Asset management (3)
- Bearing capacity (3)
- Concrete pipes (3)
- Corrosion (3)
- Cracking (3)
- Environmental impact (3)
- FEM (3)
- FRP strengthening (3)
- Infrastructure (3)
- Landfill (3)
- Load testing (3)
- Modified moisture barrier (3)
- Pavements (3)
- Plastic road (3)
- Prediction (3)
- Prediction model (3)
- Prediction models (3)
- Regression analysis (3)
- SimaPro (3)
- Publication Year
- File Type
Articles 121 - 150 of 302
Full-Text Articles in Civil Engineering
Analysis Of Barriers Causing Delay In Post-Hurricane Recovery: Experts’ Vs. Public’S Perspectives, Behzad Rouhanizadeh
Analysis Of Barriers Causing Delay In Post-Hurricane Recovery: Experts’ Vs. Public’S Perspectives, Behzad Rouhanizadeh
Civil Engineering Dissertations - Archive
Destructive natural disasters such as hurricanes, affect countries around the world. To recover from a hurricane, the managers need to make various decisions; however, what makes the post-hurricane decision making unique is lack of time to make the optimum decision. A comprehensive understanding of barriers to recovery can lead to development of policies that help prevent delays in recovery process and consequently results in resiliency. Although several studies have been performed to identify the recovery barriers, they did not provide a comprehensive review of barriers and their classification. On the other hand, experts and the public commonly have different understandings …
Statistical Models Of Pipe Service Life Towards Artificial Intelligence Based Decision Support, Vahid Eghbalifarkoosh
Statistical Models Of Pipe Service Life Towards Artificial Intelligence Based Decision Support, Vahid Eghbalifarkoosh
Civil Engineering Dissertations - Archive
In this dissertation, through utilizing various artificial intelligence-based as well as statistical models, an effort has been made to investigate the deterioration of sewer pipes. Once the deterioration rates of sewer pipes are estimated, by assuming failure criteria, as specified in the dissertation, the associated service lives for the sewer pipes can therefore be estimated. However, it should be noted that for different sewer pipes and based upon the availability of suitable data, and due to various failure modes that could transpire in various sewer pipes, the results will thus be subjected to uncertainties and variations. In other words, depending …
A Decision Support System For Success Of Post-Hurricane Reconstruction Of Transportation Infrastructures, Elnaz Safapour
A Decision Support System For Success Of Post-Hurricane Reconstruction Of Transportation Infrastructures, Elnaz Safapour
Civil Engineering Dissertations - Archive
In the aftermath of hurricanes, when reliable transportation systems are vital, the chaotic and complex environment creates multiple uncertainties and risks in the reconstruction of transportation infrastructures. Damaged transport infrastructures decrease the timeliness of emergency responses and recovery procedures, and make it difficult for authorities, who are under excessive pressure and are struggling to find the financial resources to reconstruct them on time and within budget. The aim of this research was to develop a decision support system that would improve the cost and schedule performance, as well as reduce the number and extent of rework in post-hurricane reconstruction of …
Performance Of Cracked Reinforced Concrete Pipes Subjected To Different Environmental Conditions, Bassam Hatem Karim Al-Lami
Performance Of Cracked Reinforced Concrete Pipes Subjected To Different Environmental Conditions, Bassam Hatem Karim Al-Lami
Civil Engineering Dissertations - Archive
Performance of reinforced concrete pipes, as a major part of the water and waste-water infrastructure, plays an important role in the resilience and sustainability of today’s modern cities. Cracks may appear in these pipes due to handling and placement and might affect their long-term performance due to corrosion concerns. Current practice for quality control after installation of these pipes is quite strict and any pipe with a crack width of more than 0.01" is not approved. The goal of this research project is to evaluate the performance of cracked reinforced concrete pipes subjected to saline environments with three different concentration …
Active Transportation And Health: Understanding The Impact Of Transportation-Related Physical Activity On Health, Sina Famili
Active Transportation And Health: Understanding The Impact Of Transportation-Related Physical Activity On Health, Sina Famili
Civil Engineering Dissertations - Archive
Car-oriented infrastructure in the U.S. leads to physically inactive lifestyles and negative health outcomes. To promote physical activity, public health officials encourage active transportation, namely biking and walking on daily trips. Previous studies proved that both perceived or self-assessed and objective health measures should be used to understand individuals’ health status. Therefore, this study uses the National Household Travel Survey (NHTS) data to understand the associations between perceived health and modal trip features including the number of trips, trip distance, and duration for auto, public transit, walk, and bike trips. Regarding the objective health, this dissertation uses one-week walking activities …
Development Of A Structural Design Methodology For Cementitious Sprayed Applied Pipe Linings In Gravity Storm Water Conveyance Conduits, Amin Darabnoush Tehrani
Development Of A Structural Design Methodology For Cementitious Sprayed Applied Pipe Linings In Gravity Storm Water Conveyance Conduits, Amin Darabnoush Tehrani
Civil Engineering Dissertations - Archive
Culverts are important components of the highway infrastructure. They form passageways through the embankment to convey storm water. Culverts are structurally designed to support superimposed earth loads or other fill materials as well as live loads. Corrugated metal pipes (CMPs) and reinforced concrete pipes (RCPs) are commonly used as culverts in the United States. Most of these culverts were installed four to five decades ago and have reached their design life. Spray applied pipe linings (SAPLs) are trenchless technology solutions for culvert rehabilitation that prevent further deterioration, such as corrosion, abrasion, etc., and can provide structural support for severely damaged …
Advancing Hydrologic And Hydraulic Understanding And Application Through Inundation Mapping And Estimation Of Losses, Jiaqi Zhang
Advancing Hydrologic And Hydraulic Understanding And Application Through Inundation Mapping And Estimation Of Losses, Jiaqi Zhang
Civil Engineering Dissertations - Archive
Flooding is the most frequent weather hazard that can cause serious fatalities and property damages worldwide. Climate change with extreme weather has further increased the impact from flooding and brought unprecedented challenges to engineering infrastructure and design. Scientists and engineers have used models to investigate and forecast the hydrologic and hydraulic responses to environmental changes in meteorological forcing and land use. With recent advances in sensing and computing technologies, models have been reaching higher levels of spatiotemporal granularity and scale. However, gaps exist between the scientific exploration and engineering practices. This doctoral study has been conducted to bridge such gaps …
Toward A Seismic Resistant Steel Staggered Truss Framing System (Stf), Ra'ed Al-Mazaidh
Toward A Seismic Resistant Steel Staggered Truss Framing System (Stf), Ra'ed Al-Mazaidh
Civil Engineering Dissertations - Archive
The Staggered Truss Framing (STF) system is a type of steel structural system used in mid- to high-rise buildings. It was initially developed in the 1960s in order to create a steel framing system that has low floor-to-floor height (9 to 10 ft.) and wide column-free space (60 to 80 ft.). This system consists of a series of story-high trusses spanning the total width between two rows of exterior columns and arranged in a staggered pattern on adjacent column lines. Due to the staggered layout, lateral seismic force transfer in the STF system is also in a staggered manner from …
Assembly-Scale And Whole-Building Energy Performance Analysis Of Ultra-High-Performance Fiber-Reinforced Concrete (Uhp-Frc) Façade Systems, Bahram Abediniangerabi
Assembly-Scale And Whole-Building Energy Performance Analysis Of Ultra-High-Performance Fiber-Reinforced Concrete (Uhp-Frc) Façade Systems, Bahram Abediniangerabi
Civil Engineering Dissertations - Archive
The majority of building energy consumption is used to heat and cool enclosed spaces. An innovative ultra-high-performance fiber-reinforced concrete (UHP-FRC) façade system could potentially reduce this energy consumption by utilizing UHP-FRC’s high structural strength and ductility hence more space for insulation. The energy performance assessment of innovative façade systems such as UHP-FRC panels could be misleading if the effect of building types and climate contexts on building energy consumption is not considered. Moreover, thermal bridging and hygrothermal analyses of UHP-FRC panels are needed to investigate the heat and moisture transfer within the panels. The main objectives of this study are …
Evaluation Of The Structural Performance Of Bridge Mse Retaining Walls, Zaid Sm Momani
Evaluation Of The Structural Performance Of Bridge Mse Retaining Walls, Zaid Sm Momani
Civil Engineering Dissertations - Archive
Mechanically Stabilized Earth (MSE) walls have been used extensively since the first MSE wall constructed in California in the early 70’s. MSE walls proved that they are reliable, cost-effective, aesthetically pleasing, and easily constructible. However, the design criteria of an MSE wall does not always incorporate the comprehensive behavior. A reasonable number of MSE walls do not perform as expected; a few experienced catastrophic failure. The current study was inspired by multiple MSE walls showing excessive movement of the precast panels in Fort Worth and Hurst, Texas. Three most critical MSE walls were selected for this study. The main focus …
Enhancements Of Shear Tests For Asphalt Concrete, Yazeed Suleiman Jweihan
Enhancements Of Shear Tests For Asphalt Concrete, Yazeed Suleiman Jweihan
Civil Engineering Dissertations - Archive
The measurement of the fundamental shear properties of asphalt mixes is imperative to the improvement of modelling of rutting development in asphalt concrete. The Duplicate Shear Tester (DST) is a recent device developed at the University of Texas at Arlington as a replacement to the Superpave Shear Tester (SST). It measures the average shear properties of two asphalt concrete specimens at the same time. It has ability to perform the two common SST tests: the FSCH and RSCH in according to the standard test method AASHTO T-320. Although the DST has successfully satisfied the objectives of being a reliable, inexpensive …
A Critical State Approach To The Mechanical Behavior Of Early-Age Cemented Paste Backfill, Amin B. Ghorbanpour
A Critical State Approach To The Mechanical Behavior Of Early-Age Cemented Paste Backfill, Amin B. Ghorbanpour
Civil Engineering Dissertations - Archive
Low plasticity to non-plastic mine tailings are typically transported to a storage area through pipelines in form of slurry or thickened tailings. The main concern with such tailings deposits is the possibility of liquefaction and the consequent failure of the tailings retaining dams. Tailings can also be used as Cemented Paste Backfill (CPB) material to fill previously mined underground voids. The state of practice to improve the mechanical properties of tailings is to add a small quantity of cementitious materials or binder agents. Portland cement (PC) is the most common binder agent that is used to improve the mechanical properties …
Synthesis Of Metakaolin-Based Geopolymer And Its Performance As Sole Stabilizer Of Expansive Soils, Rinu Ann Samuel
Synthesis Of Metakaolin-Based Geopolymer And Its Performance As Sole Stabilizer Of Expansive Soils, Rinu Ann Samuel
Civil Engineering Dissertations - Archive
Expansive soils have been stabilized using conventional soil stabilizers such as lime and cement for many decades. These conventional stabilizers form cementitious productions that enhance the strength properties and reduce the swelling and shrinkage potential of expansive soils. However, the energy-intensive production operations of conventional soil stabilizers release substantial amounts of harmful greenhouse gases into the atmosphere. In addition, conventional soil stabilizers are also prone to durability issues, which make them somewhat ineffective as long-term solutions. Furthermore, the use of calcium-based stabilizers cause excessive swelling and shrinkage in sulfate-bearing subgrade soils due to the formation of highly expansive minerals like …
Development Of A Flexible Pavement Design Protocol For The Uae Based On The Mechanistic-Empirical Pavement Design Guide, Ammar Hassan Alalkim Alzaabi
Development Of A Flexible Pavement Design Protocol For The Uae Based On The Mechanistic-Empirical Pavement Design Guide, Ammar Hassan Alalkim Alzaabi
Civil Engineering Dissertations - Archive
The Ministry of Infrastructure Development in the UAE has used the AASHTO 1993 Pavement Design Guide for the design of new flexible pavement structures for many years. An improved pavement design method, called the Mechanistic-Empirical Pavement Design Guide (MEPDG) was developed by AASHTO in their effort to update the empirical method used in 1993 Guide. The project was initiated by the National Cooperative Highway Research Program (NCHRP) 1-37A project. It is based on mechanistic-empirical analysis of the pavement structure to predict the performance of the pavements subject to pavement structure and materials, traffic and environmental conditions. The development allowed for …
Seismic Response And Deformation Analyses Of Earthen Dams, Leila Mosadegh
Seismic Response And Deformation Analyses Of Earthen Dams, Leila Mosadegh
Civil Engineering Dissertations - Archive
Assessment of the response of earthen structures, such as dams and levees, during earthquake events, is crucially important to geotechnical engineers. It is imperative to perform seismic response analysis to assess the stability and serviceability of these structures during probable seismic events. Before performing a seismic response analysis, an engineer or a researcher needs to select between two-dimensional (2D) plane strain analysis and a computationally intensive three dimensional (3D) analysis of an infrastructure. The 3D analysis should closely capture the behavior of infrastructure seismic response than a simplistic 2D analysis. Furthermore, a dilemma remains regarding the choice of a suitable …
Evaluation Of Fire-Affected Concrete Structures By Non-Destructive Testing Methods, Upal Mohammad Towfiqul Quadir
Evaluation Of Fire-Affected Concrete Structures By Non-Destructive Testing Methods, Upal Mohammad Towfiqul Quadir
Civil Engineering Dissertations - Archive
Fire hazard on concrete structures has been a significant concern around the world. After a fire hazard, the crucial part is the evaluation of the fire-affected concrete for strengthening or demolition. For evaluation of a fire-affected concrete structure, Non-destructive Testing (NDT) methods would certainly be a more viable option than the destructive testing methods. Until now, no specific code was developed for quantifiable evaluation of fire-affected concrete with NDT. To develop the method for Non-destructive Evaluation (NDE) of fire-affected concrete, 8 small-sized (4 in x 4 in x 15 in) and 32 medium-sized (8 in x 8 in x 36 …
Development Of A Machine Learning-Based Prediction Model For Construction And Environmental Costs Of Trenchless Spray-Applied Pipe Linings, Cured-In-Place Pipe, And Sliplining Methods In Large Diameter Culverts, Ramtin Serajiantehrani
Development Of A Machine Learning-Based Prediction Model For Construction And Environmental Costs Of Trenchless Spray-Applied Pipe Linings, Cured-In-Place Pipe, And Sliplining Methods In Large Diameter Culverts, Ramtin Serajiantehrani
Civil Engineering Dissertations - Archive
According to U.S. Department of Transportation, Federal Highway Administration there are more than 4.1 million miles of road in total length, making it the world’s longest and biggest road network with millions of culverts hidden underneath the road in the United States. The development of underground infrastructure, concerns about environmental impacts, and economic trends are influencing society, resulting in the advancement of technology for more environment-friendly and cost-effective pipeline rehabilitation. Trenchless technologies employ innovative methods, materials, and equipment that require minimum surface excavation and access area for rehabilitation of old and deteriorated culverts. Trenchless technologies can be used when other …
Optimized Rehabilitation Of Water Pipe Networks Subjected To Earthquakes, Binaya Pudasaini
Optimized Rehabilitation Of Water Pipe Networks Subjected To Earthquakes, Binaya Pudasaini
Civil Engineering Dissertations - Archive
Earthquakes in the past and in the recent times have demonstrated the extreme vulnerability of the water pipe networks. The impacts of such earthquakes on the water supply network can lead to significant direct and indirect losses. These losses highlight the critical need for seismic rehabilitation of water pipe network. Despite such criticality, water supply network managers are often constrained in what they can do with the limited rehabilitation budget that they have access to. Majority of current models dealing with seismic vulnerability assessment of water pipes do not provide actionable insights to the utility managers for the seismic rehabilitation …
Evaluation And Prediction Of Energy Potential Of Landfill Mined Solid Waste, Rakib Ahmed
Evaluation And Prediction Of Energy Potential Of Landfill Mined Solid Waste, Rakib Ahmed
Civil Engineering Dissertations - Archive
Landfilling is the most popular waste disposal system worldwide; however, with increasing scarcity of materials, increases in land values, and the presence of non-engineered landfill sites in both the developing and developed world, landfill mining has been the recipient of special interest in today’s waste management practices. Therefore, the motivation of the current study was to evaluate the energy potential of mined landfill waste and develop a statistically significant mathematical model to predict its energy potential (calorific value). The current study was conducted by using the municipal solid waste (MSW) samples collected from the City of Denton landfill and the …
Development Of Condition Prediction Models For Sanitary Sewer Pipes, Mohammadreza Malek Mohammadi
Development Of Condition Prediction Models For Sanitary Sewer Pipes, Mohammadreza Malek Mohammadi
Civil Engineering Dissertations - Archive
Utility managers and owners have challenges when addressing appropriate intervals for inspection of gravity sanitary sewer pipelines and other underground pipeline systems. Frequent inspection of sewer network is not cost-effective due to large inventory of pipes and high cost of inspections, such as using closed-circuit television (CCTV) surveys. Therefore, it would be more beneficial to first predict critical sewers most likely needing maintenance and then perform inspections to optimize use of their limited budgets and target pipelines most in need of repairs, rehabilitation or renewal. Development of sewer condition prediction models is extremely vital for utilities to evaluate the short-term …
Development Of Protocol For 100-Year Service Life Of Synthetic Fiber-Reinforced Concrete Pipes, Maziar Mahdavi
Development Of Protocol For 100-Year Service Life Of Synthetic Fiber-Reinforced Concrete Pipes, Maziar Mahdavi
Civil Engineering Dissertations - Archive
Among different components of US highways and roads, concrete pipes are one of the most important parts of these infrastructures. Currently, most of the concrete pipes that are produced in the United States are made from steel reinforced concrete composite, and this system is prone to deterioration and steel corrosion during the service life of these pipelines. In this study, a newly developed composite at the Center for Structural Engineering Research/Simulation and Pipeline Inspection was studied for service life assessment with accelerated aging methods. This composite doesn’t contain any steel reinforcement, and it is reinforced by Polypropylene fibers. At the …
A New Design Methodology Of Reinforced Concrete Squat Shear Walls For Ductile Seismic Behavior And Predictable Shear Strength, Ghassan S. Almasabha
A New Design Methodology Of Reinforced Concrete Squat Shear Walls For Ductile Seismic Behavior And Predictable Shear Strength, Ghassan S. Almasabha
Civil Engineering Dissertations - Archive
Reinforced concrete (RC) squat walls (with a height-to-length ratio of 2.0 or less) have high strength and stiffness which makes them a popular seismic force-resistant system for buildings and nuclear power plants. However, extensive studies on squat shear walls showed that squat walls have limited drift ductility because a flexural yielding mechanism is difficult to achieve, thereby undermining the role of squat walls as structural fuse members in earthquake-resisting structures. This research proposes a new design methodology of squat walls for ductile seismic behavior. While ACI 318-19 requires a mesh of steel bars to reinforce squat walls, the proposed design …
Improving Post Processing Of Ensemble Streamflow Forecast For Short-To-Long Ranges: A Multiscale Approach, Babak Alizadeh
Improving Post Processing Of Ensemble Streamflow Forecast For Short-To-Long Ranges: A Multiscale Approach, Babak Alizadeh
Civil Engineering Dissertations - Archive
A novel multi-scale post-processor for ensemble streamflow prediction, MS-EnsPost, and a multiscale probability matching (MS-PM) technique for bias correction in streamflow simulation are developed and evaluated. The MS-PM successively applies probability matching (PM) across multiple time scales of aggregation to reduce scale-dependent biases in streamflow simulation. For evaluation of MS-PM, 34 basins in four National Weather Service (NWS) River Forecast Centers (RFC) in the US were used. The results indicate that MS-PM improves over PM for streamflow prediction at a daily time step, and that averaging the empirical cumulative distribution functions to reduce sampling uncertainty marginally improves performance. The performance …
Effect Of Modified Moisture Barriers On Slopes Stabilized With Recycled Plastic Pins, Anuja Sapkota
Effect Of Modified Moisture Barriers On Slopes Stabilized With Recycled Plastic Pins, Anuja Sapkota
Civil Engineering Dissertations - Archive
High plasticity expansive clayey soils are prone to repeated swelling and shrinkage due to cyclic climatic variations. These variations lead to desiccation cracks that act as pathways for rainfall intrusion into the slope, and lead to increased moisture content. The increase in the moisture content of the soil generates considerable hydrostatic pressure, which can cause pavement distress and shallow slope failure. Previously, failed slopes in North Texas were repaired by the UTA research team using only recycled plastic pins, which increase the stability of the slope but do not improve the performance of the pavement shoulder or limit the intrusion …
Chemical Stabilization Of Expansive Soils Using Liquid Ionic Soil Stabilizers (Liss), Shi He
Chemical Stabilization Of Expansive Soils Using Liquid Ionic Soil Stabilizers (Liss), Shi He
Civil Engineering Dissertations - Archive
Traditional soil stabilizers such as lime and cement are widely used to reduce swell and shrinkage behavior and enhance strength properties of expansive soils through the formation of cementitious products. However, the manufacturing process of these calcium-based stabilizers, such as lime and cement, need large amounts of water and emit gases such as CO, CO2, NOx, and SO2 that are harmful to the environment. Hence, environmentally-friendly techniques are often sought out by the civil infrastructure industry (Puppala et al. 2018a, 2019b, George et al. 2019a, Congress and Puppala 2019). In this research, an alternative stabilizer termed as liquid ionic soil …
Performance Of Precast Concrete Bridge Girders With Externally Bonded Anchored Cfrp, Tariq Tariq Al Jaafreh
Performance Of Precast Concrete Bridge Girders With Externally Bonded Anchored Cfrp, Tariq Tariq Al Jaafreh
Civil Engineering Dissertations - Archive
Repair with Carbon Fiber Reinforced Polymer (CFRP) has become a topic of great interest to engineers in the last two decades. Fiber Reinforced Polymer (FRP) is considered as one of the most popular and practical solutions for strengthening and retrofitting civil structures, including bridge girders. Several past studies indicated that a significant increase in strength and stiffness can be achieved by using this technology; however, the major drawback of this repairing method is debonding. This research investigated the flexural behavior of simulated lateral damaged pre-stressed concrete bridge girders. Five Tx28 girders were tested up to failure, where 4 of them …
Evaluation Of Model Uncertainties In Lrfd Calibration Process Of Drilled Shaft Axial Design, Mohammad Rakib Hasan
Evaluation Of Model Uncertainties In Lrfd Calibration Process Of Drilled Shaft Axial Design, Mohammad Rakib Hasan
Civil Engineering Dissertations - Archive
The Federal Highway Administration (FHWA) released a policy in 2000 that required all new federally funded bridges to be designed using the AASHTO LRFD specifications by October 2007. The transition from ASD to LRFD posed a challenge due to the lack of area specific resistance factors. Though several studies were performed to calibrate area specific resistance factors, they did not improve from the resistance factors suggested in AASHTO 2012. The objective of this study is to analyze the uncertainties in LRFD calibration and to calibrate more accurate and improved resistance factors. A drilled shaft load test database from Mississippi and …
Comparison Of Environmental And Social Costs Of Trenchless Cured-In-Place Pipe Renewal Method With Open-Cut Pipeline Replacement For Sanitary Sewers, Vinayak Kaushal
Comparison Of Environmental And Social Costs Of Trenchless Cured-In-Place Pipe Renewal Method With Open-Cut Pipeline Replacement For Sanitary Sewers, Vinayak Kaushal
Civil Engineering Dissertations - Archive
The development of underground infrastructure, environmental concerns, and economic trends is influencing society, resulting in the advancement of technology for more efficient, environment-friendly, and cost-effective pipeline installation and renewal. Comparison of environmental and social costs of a pipeline renewal and replacement is an essential element when considering sustainable development of underground infrastructure. Project owners, decision makers, design and consulting and contractors commonly take into consideration the construction costs only, and overlook the environmental and social cost aspects while making a choice between trenchless and open-cut pipeline installation. Trenchless Cured-in-Place Pipe (CIPP) involves a liquid thermoset resin saturated material that is …
Investment Valuation Of Underground Freight Transportation (Uft) Systems Under Uncertainty, Seyed Ehsan Zahedzahedani
Investment Valuation Of Underground Freight Transportation (Uft) Systems Under Uncertainty, Seyed Ehsan Zahedzahedani
Civil Engineering Dissertations - Archive
A reliable, safe, and efficient freight transportation system is one of the most essential rudiments supporting the continuous economic growth of a nation. The United States (U.S.), as the world’s largest economy relies heavily on its transportation and freight movement systems. Population growth and economic activity have created a critical need for freight transportation services. E-commerce and online retailing have effectively challenged conventional freight transportation services, increasing the demand for faster delivery. Underground freight transportation (UFT) systems are an innovative technology that can be a viable solution to satisfy the growing demand for freight transportation services. UFT systems are automated …
Effect Of Mixing On Monochloramine Formation Through In-Line Injection Of Chemicals In Water Disinfection Process, Farhikhteh Samadi
Effect Of Mixing On Monochloramine Formation Through In-Line Injection Of Chemicals In Water Disinfection Process, Farhikhteh Samadi
Civil Engineering Dissertations - Archive
Addition of chlorine and ammonia to water for monochloramine formation in the secondary disinfection process in treatment plants has some challenges. Monochloramine formation as the only desirable product of the chloramination process is affected by several factors. These factors are pH, chlorine to nitrogen ratio and chemical mixing. In this study an investigation was conducted to measure the effect of mixing on monochloramine formation through direct injection of chemicals in a pipeline when keeping the other factors constant. In this study two sets of experiments were conducted. In the first study a tracer salt testing was used to find a …