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Articles 1 - 10 of 10
Full-Text Articles in Engineering
River & Estuary Observation Network: Refinement Of Stage Height Sensor Subsystem For Low Cost And High Reliability, W. D. Kirkey, C. B. Fuller, P. O'Brien, P. J. Kirkey, Ahmed Mahmoud, Andrew Ernest, Javier Guerrero
River & Estuary Observation Network: Refinement Of Stage Height Sensor Subsystem For Low Cost And High Reliability, W. D. Kirkey, C. B. Fuller, P. O'Brien, P. J. Kirkey, Ahmed Mahmoud, Andrew Ernest, Javier Guerrero
Civil Engineering Faculty Publications and Presentations
A system comprised of software and on-site measurements is presented for accurately obtaining water stage data from vented or non-vented submersible pressure sensors installed at autonomous stream gauging stations. The system accounts for pressure sensor offset errors, water density, and local gravitational acceleration to produce a stage height reading which is accurate to either ±0.01 ft (±3 mm) or to the accuracy limit of the sensor, whichever is greater. A 2nd order polynomial expression for determination of water density from temperature and salinity is developed and found to be sufficiently accurate for this purpose. Simulated stage measurements performed in the …
Investigation Of The Hall-Petch Relationship Using Strain Gradient Plasticity Model For Finite Deformation Framework, Yooseob Song
Investigation Of The Hall-Petch Relationship Using Strain Gradient Plasticity Model For Finite Deformation Framework, Yooseob Song
Civil Engineering Faculty Publications and Presentations
The Hall-Petch relationship in metals is investigated using the strain gradient plasticity theory within the finite deformation framework. For this purpose, the thermodynamically consistent constitutive formulation for the coupled thermomechanical gradient-enhanced plasticity model is developed. The corresponding finite element method is performed to investigate the characteristics of the Hall-Petch relationship in metals. The proposed model is established based on an extra Helmholtz-type partial differential equation, and the nonlocal quantity is calculated in a coupled method based on the equilibrium conditions. An excellent agreement between the simulation results and the test data is resulted in the Hall-Petch graph. Furthermore, it is …
0-7030: Synthesis Of Engineered Cementitious Composites (Ecc) For Applications In Texas, Philip Park, Robert Jones, Lucas Castillo, Marie Vallangca, Franher Cantu
0-7030: Synthesis Of Engineered Cementitious Composites (Ecc) For Applications In Texas, Philip Park, Robert Jones, Lucas Castillo, Marie Vallangca, Franher Cantu
Civil Engineering Faculty Publications and Presentations
Engineered cementitious composites (ECC) are a special type of high-performance fiber-reinforced cementitious composites that is characterized by high-ductility (3–5% strain) and moderate tensile strength (4–6 MPa) with 1.5–2% fiber content by volume. Under tensile deformation, ECC shows strain-hardening behavior and closely spaced microcracks after the first cracking. ECC possesses excellent shear capacity, improved damage tolerance, ability to control crack width, and synergistic interaction with reinforcing bars. ECC has been proposed as a novel alternative for infrastructure materials but to date has not seen wide application in Texas or the rest of the United States. The objective of this project is …
Impacts Of Compaction Load And Procedure On Stress-Deformation Behaviors Of A Soil Geosynthetic Composite (Sgc) Mass—A Case Study, Meenwah Gui, Truc Phan, Thang Pham
Impacts Of Compaction Load And Procedure On Stress-Deformation Behaviors Of A Soil Geosynthetic Composite (Sgc) Mass—A Case Study, Meenwah Gui, Truc Phan, Thang Pham
Civil Engineering Faculty Publications and Presentations
Fill compaction in the construction of Geosynthetic Reinforced Soil (GRS) mass is typically performed by operating a vibratory or roller compactor, which in turns imposed a compaction load in direction perpendicular to the wall face. The compaction process resulted in the development of the so-called compaction-induced stress (CIS), which may subsequently increase the stiffness and strength of the fill material. Compaction process is normally simulated using one of the following compaction procedures—(i) a uniformly distributed load acting on the top surface of each soil lift, (ii) a uniformly distributed load acting on the top and bottom surface of each soil …
Mechanism Of Organic Odor Generation From Thermophilically Digested Biosolids, Jong-Min Kim
Mechanism Of Organic Odor Generation From Thermophilically Digested Biosolids, Jong-Min Kim
Civil Engineering Faculty Publications and Presentations
In anticipation to generate more stabilized biosolids, thermophilic anaerobic digestion systems are widely used to destroy greater sludge organics thus making them less odorous. In this study, single-stage thermophilic (at 55 ℃) and mesophilic (at 37 ℃) anaerobic digesters were studied to compare organic removal efficiencies and sulfur-based odor generation from their biosolids. Although the thermophilic system removed about 9% more volatile solids than the mesophilic system, about 55 times more odorous organic sulfur compounds were measured from dewatered thermophilic biosolids. Different methanogenic species were found to be responsible for malodorous dewatered biosolids from the thermophilic anaerobic digester.
South Texas Coastal Area Storm Surge Model Development And Improvement, Sara E. Davila, Cesar Davila Hernandez, Martin Flores, Jungseok Ho
South Texas Coastal Area Storm Surge Model Development And Improvement, Sara E. Davila, Cesar Davila Hernandez, Martin Flores, Jungseok Ho
Civil Engineering Faculty Publications and Presentations
The intensification of climatic changes, mainly natural geophysical hazards like hurricanes, are of great interest to the South Texas region. Scientists and engineers must protect essential resources from coastal threats, such as storm surge. This study presents the development process and improvements of a hydrodynamic finite element model that covers the South Texas coast, specifically the Lower Laguna Madre, for the aid of local emergency management teams. Four historical tropical cyclone landfalls are evaluated and used as a means of verification of the hydrodynamic model simulation results. The parameters used to improve the accuracy of the model are the tidal …
Decision-Support System For Lid Footprint Planning And Urban Runoff Mitigation In The Lower Rio Grande Valley Of South Texas, Javier Guerrero, Taufiqul Alam, Ahmed Mahmoud, Kim D. Jones, Andrew Ernest
Decision-Support System For Lid Footprint Planning And Urban Runoff Mitigation In The Lower Rio Grande Valley Of South Texas, Javier Guerrero, Taufiqul Alam, Ahmed Mahmoud, Kim D. Jones, Andrew Ernest
Civil Engineering Faculty Publications and Presentations
To address regional flooding in the United States, federal and state agencies are adopting strict drainage policies in any large-scale commercial development within the watershed boundary. The conventional approach of implementing a wet detention pond (WP) reduces the land cover and causes operation and maintenance challenges eventually. The present study developed a decision-support system (DSS) in the Lower Rio Grande Valley region of South Texas for optimal selection of Best Management Practices (BMPs) by substituting a portion of the WP footprint with three regionally promising low-impact development practices, namely, porous concrete pavement (PCP), bioretention (BR), and bioswale (BS). Source Load …
Constitutive Models For Dynamic Strain Aging In Metals: Strain Rate And Temperature Dependences On The Flow Stress, Yooseob Song, Daniel Garcia-Gonzalez, Alexis Rusinek
Constitutive Models For Dynamic Strain Aging In Metals: Strain Rate And Temperature Dependences On The Flow Stress, Yooseob Song, Daniel Garcia-Gonzalez, Alexis Rusinek
Civil Engineering Faculty Publications and Presentations
A new constitutive model for Q235B structural steel is proposed, incorporating the effect of dynamic strain aging. Dynamic strain aging hugely affects the microstructural behavior of metallic compounds, in turn leading to significant alterations in their macroscopic mechanical response. Therefore, a constitutive model must incorporate the effect of dynamic strain aging to accurately predict thermo-mechanical deformation processes. The proposed model assumes the overall response of the material as a combination of three contributions: athermal, thermally activated, and dynamic strain aging stress components. The dynamic strain aging is approached by two alternative mathematical expressions: (i) model I: rate-independent model; (ii) model …
Water Quality Improvement And Pollutant Removal By Two Regional Detention Facilities With Constructed Wetlands In South Texas, Javier Guerrero, Ahmed Mahmoud, Taufiqul Alam, Muhammed A. Chowdhury, Adeniyi Adetayo, Andrew Ernest, Kim D. Jones
Water Quality Improvement And Pollutant Removal By Two Regional Detention Facilities With Constructed Wetlands In South Texas, Javier Guerrero, Ahmed Mahmoud, Taufiqul Alam, Muhammed A. Chowdhury, Adeniyi Adetayo, Andrew Ernest, Kim D. Jones
Civil Engineering Faculty Publications and Presentations
Stormwater runoff introduces several pollutants to the receiving water bodies that may cause degradation of the water quality. Stormwater management systems such as detention facilities and wetland can improve the water quality by removing various pollutants associated with the runoff. The objective of this research project is to determine the performance and efficiency of two major regional detention facilities (RDFs) with different designs and structures in reducing pollutants based on various storm events in McAllen, Texas. The two sites are the McAuliffe RDF and the Morris RDF; each site was incorporated with a constructed wetland with a different design and …
Mitigation Localized Flooding - Development Of A Green Infrastructure Master Plan In The Lower Rio Grande Valley, Andrew Ernest, Javier Guerrero, Ahmed Mahmoud, Roxana Tello, Jose Figueroa, Jorge Hernandez
Mitigation Localized Flooding - Development Of A Green Infrastructure Master Plan In The Lower Rio Grande Valley, Andrew Ernest, Javier Guerrero, Ahmed Mahmoud, Roxana Tello, Jose Figueroa, Jorge Hernandez
Civil Engineering Faculty Publications and Presentations
The City of Mercedes in partnership with the Lower Rio Grande Valley (LRGV) and The University of Texas Rio Grande Valley (UTRGV) proposed to develop a demonstration green infrastructure (GI) master plan to mitigate localized flooding in a high priority region within the city limits of the City. Local governments in the LRGV control localized flooding and stormwater runoff by adopting strict drainage design policies. During the course of this project, participating in local governments and the project team reviewed the city drainage policy. The project team identified those that already incorporate GI language, provided GI related information to the …