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Articles 1 - 7 of 7
Full-Text Articles in Engineering
Measurement And Modeling Of The Efficiency Of Constructed Wetlands In Removing Lead And Zinc From Neutral Ph Mine Drainage, Chang Ye
Dr. Chang Ye
"Adsorption by organic matter, Fe hydroxide association, and sulfide precipitation are primary mechanisms for Pb and Zn removal from neutral pH mine drainage by constructed wetlands. A mathematical model was developed with the geochemical modeling tool PHREEQC to simulate the constructed wetland processes, including both kinetic and equilibrium aspects of the above removal mechanisms...This research provides a quantification method to evaluate removal mechanisms of a constructed wetland and is also a direct support for previous research on wetland removal mechanisms"--Abstract, leaf iii.
Book Review, Earthea Nance
Book Review, Earthea Nance
Earthea Nance, PhD (Stanford University, 2004)
Book Review published in the journal Water International (2015) The topic… “The book builds upon Nance’s research and presents a comprehensive account of Brazil’s experience of implementing condominial sewerage.” The topic… “From the very beginning, the author expresses her concerns in escaping from preconceived ideas about conventional and participatory development, positioning her views within a third wave of post-structural development discourse, neither universalist nor relativist, that is neither denying nor overvaluing the social content of development.” Research methods… “Nance manages to do so by integrating different areas of established knowledge and examining her research issue from a privileged historical perspective. …
Use Of Auxiliary Lanes At Isolated Freeway On-Ramp Junctions, Yubian Wang, Ruey Long Cheu, Yi Qi, Xiaoming Chen
Use Of Auxiliary Lanes At Isolated Freeway On-Ramp Junctions, Yubian Wang, Ruey Long Cheu, Yi Qi, Xiaoming Chen
Yi Qi
No abstract provided.
Investigation Of Ballast Degradation And Fouling Trends Using Image Analysis, M. Moaveni, Y. Qian, H. Boler, D. Mishra, E. Tutumluer
Investigation Of Ballast Degradation And Fouling Trends Using Image Analysis, M. Moaveni, Y. Qian, H. Boler, D. Mishra, E. Tutumluer
Debakanta Mishra
Ballast fouling, often associated with deteriorating railroad track performance, refers to the condition when the ballast layer changes its composition and becomes much finer in grain size distribution. This paper describes an image analysis approach to characterize different stages of railroad ballast degradation studied using Los Angeles abrasion testing in the laboratory. An aggregate image analysis approach is utilized to investigate ballast particle abrasion and breakage trends at every stage through detailed quantifications of individual ballast particle size and shape properties. Aggregate image processing or segmentation techniques have been also developed and used in this study to analyze the two-dimensional …
Field Performance Evaluations Of Illinois Aggregates For Subgrade Replacement And Subbase—Phase Ii, Debakanta Mishra, Erol Tutumluer
Field Performance Evaluations Of Illinois Aggregates For Subgrade Replacement And Subbase—Phase Ii, Debakanta Mishra, Erol Tutumluer
Debakanta Mishra
The project objective was to validate the results from ICT Project R27-1, which characterized in the laboratory the strength, stiffness, and deformation behaviors of three different aggregate types commonly used in Illinois for subgrade replacement and subbase applications, through accelerated loading of full-scale pavement working platform test sections. Six different test “cells” were constructed at different combinations of aggregate material quality and subgrade strength, and were tested to failure using the University of Illinois Accelerated Transportation Loading Assembly (ATLAS). Each cell was tested along two different wheel paths representing two different aggregate layer moisture contents (Cells 1-5), or geotextile reinforcement …
Analysis Of Segmentation Algorithms For Pavement Distress Images, Allen Downey, Haris N. Koutsopoulos, Ibrahim El Sanhouri
Analysis Of Segmentation Algorithms For Pavement Distress Images, Allen Downey, Haris N. Koutsopoulos, Ibrahim El Sanhouri
Allen B. Downey
Collection and analysis of pavement distress data is an important component of any pavement‐management system. Various systems are currently under development that automate this process. They consist of appropriate hardware for the acquisition of pavement distress images and, in some cases, software for the analysis of the collected data. An important step in the automatic interpretation of images is segmentation, the process of extracting the objects of interest (distresses) from the background. We examine algorithms for segmenting pavement images and evaluate their effectiveness in separating the distresses from the background. The methods examined include the Otsu method, Kittler's method, a …
Primitive-Based Classification Of Pavement Cracking Images, Allen Downey
Primitive-Based Classification Of Pavement Cracking Images, Allen Downey
Allen B. Downey
Collection and analysis of pavement distress data are receiving attention for their potential to improve the quality of information on pavement condition. We present an approach for the automated classificaton of asphalt pavement distresses recorded on video or photographic film. Based on a model that describes the statistical properties of pavement images, we develop algorithms for image enhancement, segmentation, and distress classification. Image enhancement is based on subtraction of an “average” background: segmentation assigns one of four possible values to pixels based on their likelihood of belonging to the object. The classification approach proceeds in two steps: in the first …