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Now showing items 21-30 of 82
Effect of soil pH and texture on the ratio of denitrification end products
(2022-12)
Nitrous oxide (N₂O) is a potent greenhouse gas that contributes to stratospheric ozone depletion and global climate change. Denitrification has two potential end products, N₂O and dinitrogen (N₂), and the ratio of these ...
Exploring pavement texture and surface skid resistance using soft computing techniques
(2017-12)
Pavement skid resistance and texture characteristics are important aspects of road safety. Traditional pavement friction measurement from limited contact with pavement is influenced by multiple factors such as temperature, ...
Application of nonlinear autoregressive neural networks with exogenous inputs (NARX) in seismic fragility analysis of buildings
(2020-07)
Rapidly growing societal needs in urban areas are increasing the demand for tall buildings with complex structural systems. Many of these urban areas are located in zones characterized by high seismic activity. Quantifying ...
Development of predictive modeling tools for estimating fuel use and emission rates for heavy-duty diesel construction equipment
(2014-05)
Heavy-duty diesel (HDD) construction equipment consumes a substantial amount of fuels and consequently emits a substantial amount of pollutants into the environment. This dissertation presents methodologies for estimating ...
Comparing the variability of sample consolidation methods on low workability concrete
(2020-05)
Quality control and assurance testing for concrete provides quantitative information about the quality of the concrete being placed. Yet, improperly consolidating the fresh concrete sample can negatively affect the testing ...
Development of a productivity-based economic, energy, environmental model for heavy duty diesel construction equipment
(2013-05)
The use of heavy duty diesel (HDD) equipment in infrastructure projects accounts for a large quantity of fuel consumption, pollutants emissions and the majority of the total cost of the project compared to others. Construction ...
Evaluation of pavement skid resistance using computational intelligence
(2018-08)
Pavement micro-texture is affected by the aggregate characteristics contained within the surface. It is long desired to develop friction prediction models using pavement surface and aggregate textural properties. However, ...
Investigation of ion diffusion in cementitious materials with x-ray imaging techniques
(2020-07)
Concrete is susceptible to the migration of highly deleterious ions. The external penetration of ions into cementitious materials is the primary factor influencing the longterm durability of concrete structures. There are ...
Dual statistical approach for correlation of shear wave velocity with the SCPTu parameters
(2022-07)
Over 30 years of research in the field of shear wave velocity (Vₛ) estimation, scores of researchers were successful in modeling Vs using the Seismic Cone Penetration Test (SCPT) parameters. Through this research work, by ...
Camber, prestress loss, and determination of distribution factors in pretensioned concrete girder bridges
(2022-12)
This research investigates prestress losses and camber of Prestressed Concrete bridge beams (PC Beams), and the performance and load testing of the SH 4 Bridge over the North Canadian River in Canadian County, OK. The ...