Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Acoustic signal monitoring (1)
- Adsorption (1)
- Barite (1)
- Bedload transport (1)
- Constant water (1)
-
- Continuous Welded Rail (1)
- Damage evaluation, concrete structures, acoustic emission, stress wave (1)
- Damping (1)
- Flow hydrodynamics (1)
- Freight (1)
- Freight logistics system (1)
- Freight transport (1)
- Geo-structures (1)
- Global market (1)
- Gradient projection (1)
- Health monitoring (1)
- Liquid pipelines (1)
- Mixed bedrock-alluvial reaches (1)
- Morphodynamics (1)
- Particle dispersal (1)
- Piping systems (1)
- Pressure oscillations (1)
- Radium (1)
- Rail (1)
- Rail Neutral Temperature (1)
- Silica (1)
- Soil water (1)
- Soil water characteristic curve (1)
- StereoDIC hardware (1)
- Tracer particles (1)
Articles 1 - 9 of 9
Full-Text Articles in Engineering
Experimental Investigation Of Hydraulic Effects On Unsaturated Soils Behaviors, Muwafaq Awad
Experimental Investigation Of Hydraulic Effects On Unsaturated Soils Behaviors, Muwafaq Awad
Theses and Dissertations
Geo-structures are frequently constructed in or on soils with unsaturated conditions and are subjected to variations of moisture contents due to seasonal changes. Even though unsaturated soil mechanics have been established for several decades, it has not been fully implemented in practice today because of a lack of understanding of the interaction between the soil, water, and air phases. Many experimental research studies have been conducted to improve the understanding of unsaturated behavior but these studies are typically limited to small soil elements tested under fully drained conditions. The goal of this research is to evaluate the effect of hydraulics …
A Non-Contacting System For Rail Neutral Temperature And Stress Measurements, Katelyn Knopf
A Non-Contacting System For Rail Neutral Temperature And Stress Measurements, Katelyn Knopf
Theses and Dissertations
Continuous Welded Rail (CWR) has become the standard in modern railway track construction around the world because it alleviates well-documented disadvantages of rail joints in a track. CWR practice results in long segments of continuous rail in the track that will develop significant thermal elongation. To avoid the use of impractical large thermal expansion joints and limit the expected thermal elongation, the rail is anchored to the ties. Consequently, the rail is exposed to higher thermal stress demands as the rail temperature varies. At the time a CWR is laid, the rail is free of thermal stresses; the temperature at …
Damage Evaluation Of Concrete Structures Using Acoustic Emission, Rafal Anay
Damage Evaluation Of Concrete Structures Using Acoustic Emission, Rafal Anay
Theses and Dissertations
The deterioration and aging of the infrastructure in the U.S. have become a crucial issue, especially for highway bridges and nuclear power plants. The reliability and safety of existing structures are affected by growing populations and limited resources. This issue has gained significant concern during the last two decades and efforts are being conducted to accelerate the improvement of nondestructive testing (NDT) and structural health monitoring (SHM) methods. Additional information regarding the condition of existing structures and the early detection of damage can aid in reducing overall maintenance costs. The studies presented in this dissertation employ acoustic emission (AE) as …
Damping In Transient Pressurized Flows, Sahad Salim Elyass Khilqa
Damping In Transient Pressurized Flows, Sahad Salim Elyass Khilqa
Theses and Dissertations
Piping systems are commonly designed to withstand the first transient pressure peak, which is unaffected by dissipation. However, for multiple operations of control equipment, e.g., pump start-up following pump shutdown, load acceptance following load rejection on hydraulic turbines, etc., an accurate prediction of the dissipation of pressure oscillations is needed to determine a suitable time for the second operation. For this purpose, a method is presented to compute the dissipation of pressure oscillations in piping system following a simple procedure used for computing the dissipation of vibrations of bridges and other structures. Similar to structural engineering, this method is simple …
Health Monitoring Of Liquid Pipelines, Mohammed Hameed Sabhan Al-Tofan
Health Monitoring Of Liquid Pipelines, Mohammed Hameed Sabhan Al-Tofan
Theses and Dissertations
The crude and refined oil, water, and other liquids are widely transported through pipelines over long distances within geographical boundaries of countries or beyond. Pipeline accidents, however, are frequent, affecting operation and reducing targeted performance. The frequency of these accidents presents a growing concern and necessitates the need for an effective health monitoring plan. This plan requires monitoring of flow conditions and warning of any changes or abnormal conditions. Abnormalities in the flow conditions include changes in the piping system performance due to defects, such as leaks and blockages. These changes can be located and quantified utilizing different approaches. Two …
Modeling Particle Dispersal In Bedload Dominated Settings, Sanaz Borhani
Modeling Particle Dispersal In Bedload Dominated Settings, Sanaz Borhani
Theses and Dissertations
Tracer particles are used to study bedload transport in gravel bed rivers. One of the advantages associated with their use is that they allow for direct measurements of particle entrainment rates in bedload transport and particle displacement. The main issue in field studies with tracer particles is the difference between tracer short term and long term behavior. This difference is due to the fact that particles undergo vertical mixing or move to less active locations such as bars or even floodplains. For these reasons the mean tracer velocity decreases over time. This phenomenon has been called tracer slowdown and it …
The Study Of Flow Hydrodynamics And Transport Processes Over Mixed Bedrock-Alluvial Reaches, Mohammad Sadegh Jafarinik
The Study Of Flow Hydrodynamics And Transport Processes Over Mixed Bedrock-Alluvial Reaches, Mohammad Sadegh Jafarinik
Theses and Dissertations
Research efforts on mixed bedrock-alluvial rivers primary focused on the bedrock incision and very few studies investigated the alluvial morphodynamics of such systems. To the best of my knowledge none of these models have been considered the spatial variability of the sediment grain size of the bed surface in mixed bedrock-alluvial reaches and very few models focused on the spatial changes in alluvial cover within these reaches. Furthermore, a perusal of the literature on mixed bedrock-alluvial river morphodynamics reveals that very little information is available on 1) bedform geometry and flow resistances and 2) sediment sorting patterns in presence of …
Mechanisms Of Radium Adsorption On Silica And Barite, Hamid Hamid
Mechanisms Of Radium Adsorption On Silica And Barite, Hamid Hamid
Theses and Dissertations
The use of experimental studies with computer modeling is vital in the development of cost-effective methods for treating radium containing wastewaters. The goal of this dissertation is to develop a multi-scale model to study radium removal mechanisms onto silica and barite, and the effect of water quality parameters on radium removal. The major tasks to be accomplished in this study are: to develop a multi-component isotherm model for radium removal on different ionized silica surfaces; to re-parameterize sulphate force fields to account for metal-sulfate interactions; and to simulate radium removal on barite under different water quality conditions. We conducted molecular …
Development Of Models For Road-Rail Intermodal Freight Network Under Uncertainty, Md Majbah Uddin
Development Of Models For Road-Rail Intermodal Freight Network Under Uncertainty, Md Majbah Uddin
Theses and Dissertations
Freight activities are directly related to a country’s Gross Domestic Product and economic viability. In recent years, the U.S. transportation system supports a growing volume of freight, and it is anticipated that this trend will continue in the coming years. To support the projected increase in freight volume, an efficient, reliable, and low-cost freight logistics system is necessary to keep the U.S. competitive in the global market. In addition, intermodal transport is becoming an increasingly attractive alternative to shippers, and this trend is likely to continue as state and federal agencies are considering policies to induce a freight modal shift …