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Articles 1 - 8 of 8
Full-Text Articles in Civil Engineering
Electromagnetic Waves In Contaminated Soils, Arvin Farid, Akram Alshawabkeh, Carey Rappaport
Electromagnetic Waves In Contaminated Soils, Arvin Farid, Akram Alshawabkeh, Carey Rappaport
Carey Rappaport
Soil is a complex, potentially heterogeneous, lossy, and dispersive medium. Modeling the propagation and scattering of electromagnetic (EM) waves in soil is, hence, more challenging than in air or in other less complex media. This chapter will explain fundamentals of the numerical modeling of EM wave propagation and scattering in soil through solving Maxwell’s equations using a finite difference time domain (FDTD) method. The chapter will explain how: (i) the lossy and dispersive soil medium (in both dry and fully water-saturated conditions), (ii) a fourth phase (anomaly), (iii) two different types of transmitting antennae (a monopole and a dipole), and …
Removing 17Β-Estradiol From Drinking Water In A Biologically Active Carbon (Bac) Reactor Modified From A Granular Activated Carbon (Gac) Reactor, Zhongtian Li
Z Li
Estrogenic compounds in drinking water sources pose potential threats to human health. Treatment technologies are needed to effectively remove these compounds for the production of safe drinking water. In this study, GAC adsorption was first tested for its ability to remove a model estrogenic compound, 17β-estradiol (E2). Although GAC showed a relatively high adsorption capacity for E2 in isotherm experiments, it appeared to have a long mass transfer zone in a GAC column reactor, causing an early leakage of E2 in the effluent. With an influent E2 concentration of 20 μg/L, the GAC reactor was able to bring down effluent …
Statewide Wireless Communications Project, Volume 2: Inductive Loop Detection Of Bicycles And Inductive Loop Signature Processing For Travel Time Estimation, J. Krogmeier, Darcy Bullock
Statewide Wireless Communications Project, Volume 2: Inductive Loop Detection Of Bicycles And Inductive Loop Signature Processing For Travel Time Estimation, J. Krogmeier, Darcy Bullock
Darcy M Bullock
The Statewide Wireless Communications Project was an umbrella project intended to support various INDOT activities in the area of wireless communications. As these activities were conducted independently the report for the project is organized into three volumes. Volume 1 contains the results of satellite and cellular communications field testing undertaken in support of INDOT’s SiteManager application. Volume 1 also contains the results of an evaluation of spread spectrum radios for long-range communications. Volume 2 contains the results of detection zone evaluation for loop detection of bicycles and the results of testing algorithms for travel time estimation using vehicle re-identification based …
Impact Of Camera And Lighting Position On Video Detection Precision, Avery Rhodes, Kristofer Jennings, Darcy Bullock
Impact Of Camera And Lighting Position On Video Detection Precision, Avery Rhodes, Kristofer Jennings, Darcy Bullock
Darcy M Bullock
On well-illuminated approaches, vehicle headlight reflections on the pavement were observed to cause video detection units to activate early. This early activation results in a dramatic increase in the length of the effective vehicle detection zone. This observed variation in the effective length of the vehicle detection zone that varies by ambient lighting condition and camera placement presents a very serious impediment for traffic engineers to design vehicle extension intervals that operate correctly during day, night and transition periods. Furthermore, the stochastic variation in the length of the vehicle detection zone length has the potential to create driver expectancy issues. …
Implementation Of Station Health Monitoring Procedures For Its Sensors, Volume 2: Implementation Report, Joseph Ernst, Darcy Bullock
Implementation Of Station Health Monitoring Procedures For Its Sensors, Volume 2: Implementation Report, Joseph Ernst, Darcy Bullock
Darcy M Bullock
No abstract provided.
Quantifying Benefits Of Traffic Signal Retiming, Christopher Day, Thomas Brennan, Hiromel Premachandra, Alexander Hainen, Stephen Remias, James Sturdevant, Greg Richards, Jason Wasson, Darcy Bullock
Quantifying Benefits Of Traffic Signal Retiming, Christopher Day, Thomas Brennan, Hiromel Premachandra, Alexander Hainen, Stephen Remias, James Sturdevant, Greg Richards, Jason Wasson, Darcy Bullock
Darcy M Bullock
Improvements in the quality of service on a signalized intersection or arterial can be interpreted as a reduction in the user cost of service, which is expected to induce demand based on economic theory. This report presents a methodology for measuring and interpreting changes to user costs, and determining whether demand was induced. High-resolution signal event data and Bluetooth device MAC address matching are demonstrated in three case studies with the purpose of quantifying the impacts of changes in signal timing plans. In the first case study, 21 months of vehicle volume data are used to test whether demand was …
Dataset For Investigating Computational Efficiency Of Alternative Arterial Offset Optimization Algorithms, Christopher Day, Darcy Bullock
Dataset For Investigating Computational Efficiency Of Alternative Arterial Offset Optimization Algorithms, Christopher Day, Darcy Bullock
Darcy M Bullock
No abstract provided.
Real-Time Arterial Traffic Signal Performance Measures, Christopher Day, Edward Smaglik, Darcy Bullock, James Sturdevant
Real-Time Arterial Traffic Signal Performance Measures, Christopher Day, Edward Smaglik, Darcy Bullock, James Sturdevant
Darcy M Bullock
Increasing demand for highway system capacity compels transportation agencies to extract as much capacity as possible from existing systems. Traffic signals represent a major component of highway systems. Improvement of traffic signal operation requires accurate performance measures. Despite recent improvements in computing technology, traffic signal controllers are currently not able to capture useful performance measures on a cycle-by-cycle basis. This report presents a set of performance measures that could be collected on a cycle-by-cycle basis by a traffic signal controller given the capability to log phase indications and detector actuations. The performance measures investigated here include the volume-to-capacity ratio and …