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Articles 841 - 870 of 3180
Full-Text Articles in Engineering
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 …
Laboratory Testing And Finite Element Modeling Of Invert Removed Corrugated Metal Culvert Buried Under Shallow Cover, Hiramani Raj Chimauriya
Laboratory Testing And Finite Element Modeling Of Invert Removed Corrugated Metal Culvert Buried Under Shallow Cover, Hiramani Raj Chimauriya
Civil Engineering Theses - Archive
Ever since their advent in the 1800s, corrugated metal pipes (CMPs) have played a vital role in this nation’s infrastructure. The wide range of options on diameter and span have made these culverts more preferable over traditional concrete culverts. However, compared to concrete culverts, CMPs have a shorter design life and are only expected to last 10 to 30 years even under ideal conditions. Over the course of years, different open-cut and trenchless methods have been used to rehabilitate existing old and damaged culverts. In recent years, trenchless methods like sliplining, CIPP, spray-applied pipe linings, etc. have been gaining popularity …
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 …
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 …
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 …
Remaining Service Life Estimation And Probabilistic Analysis Of Reinforced Concrete Sewer Pipeline Systems, Pardis Moamaei
Remaining Service Life Estimation And Probabilistic Analysis Of Reinforced Concrete Sewer Pipeline Systems, Pardis Moamaei
Civil Engineering Theses - Archive
The serviceability and structural performance of reinforced concrete pipes could deteriorate for many reasons. The loss in structural capacity and other structural operations may drastically affect the surrounding environment, public health and the economy. This research is directed towards the estimation of remaining service life, and to evaluate the level of risk of failure of reinforced concrete sewer pipes (RCSP) that are subjected to continuing corrosion due to sulfide attack that in turn leads to loss of pipe thickness caused by excessive deterioration along the pipe’s interior wall. In order to estimate the remaining service life, reliability theory is used …
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 …
Long-Distance And Broad-Band Aerial Communication Using Directional Antennas: Theory, Implementation, And Applications, Songwei Li
Electrical Engineering Dissertations - Archive
Unmanned aerial vehicles (UAV) have found broad civilian applications. However, existing commercial usages are limited to single UAVs. To facilitate commercial multi-UAV applications, robust UAV-to-UAV communication with long-distance and broad-band capabilities is critical. Such a communication architecture should not rely on ground infrastructure support, and hence can be applied whenever needed in scenarios where infrastructures are not available. It is foreseen to have extensive usages in a wide spectrum of commercial UAV applications such as emergency response, remote sensing, and nondestructive health monitoring. A promising solution for such a communication architecture is aerial communication using directional antennas (ACDA). We developed …
Analytical And Numerical Modeling Of Externally Heated Geothermal Bridge Deck, Mandakini Chowdhury
Analytical And Numerical Modeling Of Externally Heated Geothermal Bridge Deck, Mandakini Chowdhury
Civil Engineering Theses - Archive
Bridge icing is a severe safety concern for travel during winter months in the United States. Ice on bridges form quicker than roads, as the bridge is exposed to wind on all its surfaces. The underlying problem of bridge icing is loss of friction between the vehicle wheel and the pavement surface due to slippery nature of ice. Hence, the solution is to increase the friction between the above-mentioned surfaces. The most commonly adopted solution is application of sand, salt or other granular materials on the roadway. However, due to corrosive nature of the salts, the durability of the infrastructure …
User Syndication Using Speech Rhythm, Faisal Z H Alnahhas
User Syndication Using Speech Rhythm, Faisal Z H Alnahhas
Civil Engineering Theses - Archive
In recent years we have seen a variety of approaches to increase security on computers and mobile devices including fingerprint, and facial recognition. Such techniques while effective are very expensive. Voice biometrics, specifically speech rhythm, is a method that has been drawing attention and growing in recent years. Unlike other methods, it requires little to no additional hardware installed on a device for it to work accurately. Speech rhythm utilizes the device's built-in microphone, and analyzes speakers based on features of their speech. In this work we leverage the existing hardware and simply add an efficient layer of software to …
Mars Knot Positioning And Global Optimization, Xinglong Ju
Mars Knot Positioning And Global Optimization, Xinglong Ju
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
Multivariate adaptive regression splines (MARS) is a statistical modeling approach with wide real-world applications. In the MARS model building process, knot positioning is a critical step that potentially affects the accuracy of the final MARS model. Identifying well-positioned knots entails assessing the quality of many knots in each model building iteration, which requires much computation efforts. By exploring the change in the residual sum of squares (RSS) within MARS, we find that local optima from previous iterations can be very close to those of the current iteration. In our approach, the prior change in RSS information is used to “warm …
Analyzing Collaboration In Food Assistance Networks Using Agent-Based Modeling, Joyita Mostafa
Analyzing Collaboration In Food Assistance Networks Using Agent-Based Modeling, Joyita Mostafa
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
To address the issue of food insecurity, many small independent agencies, known as food pantries, collect and distribute donated food to food-insecure clients. However, the supply of donated food varies significantly from week to week, leading to frequent mismatches in supply and demand. One approach to addressing this problem is to facilitate greater food pantry collaboration, such that they are able to balance supply and demand among themselves. However, their interpersonal relationships and the additional costs associated with transshipments can be a barrier to collaboration. The objective of this research is to use modeling to gain a better understanding of …
Optimal Control Strategies And Reinforcement Learning For Dynamical Multiagent Systems In Graphical Games, Victor Gabriel Lopez Mejia
Optimal Control Strategies And Reinforcement Learning For Dynamical Multiagent Systems In Graphical Games, Victor Gabriel Lopez Mejia
Electrical Engineering Dissertations - Archive
As the number of autonomous agents increases in industrial and urban areas, the development of formal protocols to analyze their behavior as they interact with each other becomes of central interest in control systems research. Each agent in this setting is interested in completing a specific task with considerations of an optimal performance. Game theory has become one of the most useful tools in multiagent systems analysis due to its rigorous mathematical representation of optimal decision making. The analysis of dynamical systems has been developed in the branch of game theory regarded as differential games. The ser of graphical games …
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 …
Comparative Rack Level Cfd Analysis Of Air To Hybrid Cooling Data Center, Jay Umeshkumar Parekh
Comparative Rack Level Cfd Analysis Of Air To Hybrid Cooling Data Center, Jay Umeshkumar Parekh
Mechanical and Aerospace Engineering Theses - Archive
The demand of data storage in the world is increasing, with this increase, demand for large data centers is growing. In response, we need to look for energy-efficient solutions to reduce the energy consumptions of the data centers. We want to reduce the energy used for cooling while keeping the data center equipment temperature in allowable range in high power density data center. The liquid or hybrid cooled servers are the alternatives that may be used instead of traditional air-cooled servers at Rack Level for the cooling power - different inlet temperatures and different percentage of hybrid cooling. This will …
Towards Automated Understanding Of Laparoscopic Videos, Babak Namazi
Towards Automated Understanding Of Laparoscopic Videos, Babak Namazi
Electrical Engineering Dissertations - Archive
Despite the advantages of minimally invasive surgeries, the indirect access and lack of the 3D field of view of the area of interest introduce complications in the procedures. Fortunately, the recorded videos from the operation offer the opportunity for intra-operative and post-operative analyses of the procedures, to improve future performance and safety. Such analysis is essential to provide the tools for evaluation and assessment of the surgeries. In this dissertation, we investigate the potential of deep learning techniques in understanding the videos captured during laparoscopic surgeries. To this end, we describe new methods for identifying the surgical instruments and the …
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 …
On The Concept Of Synthetic Fiber Reinforced Thin-Walled Concrete Pipes, Arash Emami Saleh
On The Concept Of Synthetic Fiber Reinforced Thin-Walled Concrete Pipes, Arash Emami Saleh
Civil Engineering Dissertations - Archive
This research investigates the structural and industrial possibility to create a new type of concrete pipes called synthetic fiber reinforced thin-walled concrete pipes, which would be lighter, cheaper, and more durable than what is currently in use while still providing a pipe product much less dependent upon installation conditions than the very flexible metal and plastic pipes in the American market. The idea is to reduce the thickness and reinforcement of the current reinforced concrete pipes to increase their deflection before failure and control the crack formation and width by using synthetic fibers. The flexibility of these pipes will enable …
Development Of A Framework For Design And Installation Of Cementitious Spray Applied Pipe Linings In Renewal Of Corrugated Metal Culverts, Seyedmohammadsadegh Jalalediny Korky
Development Of A Framework For Design And Installation Of Cementitious Spray Applied Pipe Linings In Renewal Of Corrugated Metal Culverts, Seyedmohammadsadegh Jalalediny Korky
Civil Engineering Dissertations - Archive
Millions of culverts under road embankments provide drainage for U.S. transportation network system and are in need of maintenance, repair, and renewal. Over time culverts, like any other asset, deteriorate due to many factors. Spray applied pipe lining (SAPL) is one of the trenchless technology methods applicable for culverts renewal. In the SAPL method, polymers or cementitious materials are sprayed by machine or manually in different lifts to achieve required thickness based on the design criteria. The scope of this dissertation includes reinforced concrete pipe and corrugated metal pipe (RCP and CMP) culverts renewal with cementitious and polymer SAPLs. The …
Rainfall Simulation For Investigating Hydrologic Responses To Storm Characteristics And Facilitating Frequency Analysis, Shang Gao
Civil Engineering Dissertations - Archive
Hydrologic and Hydraulic practices depend on the characterization of extreme precipitation that is rare in nature. Despite the advancement in sensing technology, the observation record of extreme rainfall with good spatio-temporal resolution has not reached a sufficient length. Furthermore, rainfall observation may never be sufficient in a non-stationary climate. Towards solutions to these issues, rainfall simulation was explored in this study (1) to investigate hydrologic responses to storm characteristics and (2) to facilitate rainfall frequency analysis. To that end, this study initially employed storm transposition plus hydrologic simulation for generating possible rainfall-runoff scenarios which further reveal relationships between storm characteristics …
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 …
Utilizing The State Of Art Technologies To Assess And Address Urban Flooding, Daniel Li
Utilizing The State Of Art Technologies To Assess And Address Urban Flooding, Daniel Li
Civil Engineering Dissertations - Archive
Today, 55% of the world’s population lives in urban area, a proportion that is expected to increase to 60% by 2050. Projections show that urbanization, the gradual shift in residence of the human population from rural to urban areas, combined with the overall growth of the world’s population could add another 2.5 billion people to urban areas by 2050. With growing opportunities, there are great challenges. One of the challenges that urban communities are facing is the increasing flood risks. In U.S., over the past decade, extreme storm events have wreaked havoc on many urban areas. Aging and inadequate infrastructure, …
A Multi-Agent Demand Response Planning And Operational Optimization Framework, Alireza Fallahi
A Multi-Agent Demand Response Planning And Operational Optimization Framework, Alireza Fallahi
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
This research describes a real-time optimization model for multi-agent demand response (DR) from a Load Serving Entity (LSE) perspective. We formulate two infinite horizon stochastic optimization models; specifically, an LSE model and a dynamic pricing customer model. The objective of these models is to minimize long-term cost and discomfort penalty of the LSE and dynamic pricing customers. We solve a deterministic finite horizon linear program as an approximation of the suggested stochastic model and provide computational experiments. In stochastic programming (SP), a wait-and-see solution is at least as good as an optimal policy. On the other hand, a policy that …
Uncovering Underlying Features For State Transition Modeling, Ashkan Farahani
Uncovering Underlying Features For State Transition Modeling, Ashkan Farahani
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
Modeling of a dynamic system is the representation of the interconnectivity of system state variables and their evolutionary trajectory over time. In this dissertation, the terminology “state transition modeling” refers to a situation when the system state transitions and its evolution is unknown and needs to be estimated. There are situations in many application settings where one does not simply observe the behavior of the system, but also has a desire to take action, intervene, and manipulate one or more system variables, and is interested in seeing the causal effect of the intervention. These interventions within a purely observational setting, …
6th Ic4n Book Of Abstracts, Efstathios Meletis, Constantin Politis, Wolfram Schommers, Nikolaos Kanellopoulos
6th Ic4n Book Of Abstracts, Efstathios Meletis, Constantin Politis, Wolfram Schommers, Nikolaos Kanellopoulos
International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems - Archive
IC4N is a highly interdisciplinary conference focusing on all aspects of nanoscience and nanotechnology addressing global problems in energy, environment and human health. As in previous editions of this highly popular conference series, the overarching goal is to combine a high quality of scientific dialogue with a relaxing environment. This is a unique opportunity for both senior and junior researchers to meet, interact, and stimulate collaborations on a global scale. A number of Plenary, Keynote and invited lectures are planned by renowned scientists from all over the world, making IC4N an international nano forum of the highest quality.
Proceedings published …
Investigation Of The Surface Topology Changes Associated With Fatigue, Randall D. Kelton
Investigation Of The Surface Topology Changes Associated With Fatigue, Randall D. Kelton
Material Science and Engineering Dissertations - Archive
Metals have long been known to change their surface topology when subjected to a plastic strain. Given that a plastic zone exists at the tip of a propagating crack, it would seem natural to quantitatively study surface topology changes associated with nucleating and propagating fatigue cracks. So far the workers in this study have only found one measurement of the surface topology changes associated with a nucleating crack. The current research seeks to study and refine, a possible correlation between crack growth and surface topology changes, with the object to develop a damage index for fatigue cracking from surface topology …
Electrochemical Energy Storage Integration Challenges Within High Voltage Distributed Generation Power System Architectures, Charles N. Nybeck
Electrochemical Energy Storage Integration Challenges Within High Voltage Distributed Generation Power System Architectures, Charles N. Nybeck
Electrical Engineering Dissertations - Archive
Future stationary and mobile microgrids may be deployed with a number of high power electrical loads that operate transiently. The transient nature of the loads will impart high stress on a microgrid’s power system, possibly pushing it outside of the acceptable power quality standards. To restore power quality and increase system reliability, it is being proposed that electrochemical energy storage systems be used as a buffer. Energy storage systems that store a great deal of energy and could be used with open circuit potentials (OCPs) as high as 1 kV. Since size and weight on a mobile microgrid is limited, …