The biodegradation of five polychlorinated biphenyls (PCBs) by
Hudson River and Silver Lake sediments was studied using gas
chromatography with electron capture detection (GC/ECD) and gas
chromatography with mass spectrometry (GC/MS) analyses. Methanogenic
sediments from the Hudson River and Silver Lake were used to inoculate
four anaerobic filter reactors. The...
The effects of vertical ground motion are particularly significant
in the design of highway bridge girders. Conventional codes do
not recommend methods for solving the problem. The intent of this
work is to suggest an approach for such design.
A set of curves for velocity spectra which are the average...
As mass-timber building construction rises around the globe, there exists the need to verify the long-term, in-situ behavior and performance of these structural systems. Structural health monitoring (SHM), generally defined as a damage detection strategy consisting of a network of sensors, a data acquisition system, and algorithms for data analysis,...
A problem confronting the Corps of Engineers and other water resources planners in the Pacific Northwest is the prediction of anadromous fish enhancement benefits that would result from a proposed high dam project. These benefits are expected from augmenting natural streamflows with relatively cold reservoir withdrawals. The resulting increased streamflows...
A spreadsheet-based transport model was developed in Microsoft Excel™ as part of a six-year National Cooperative Highway Research Program project conducted at Oregon State University. The model simulated the leaching, transport, removal, and retardation processes that occur in the surface and subsurface pathways of the near highway environment. For all...
The environment has been exposed to a number of hazardous chlorinated
organic compounds. These compounds may be anaerobically biotransformed by
sequential reductive dechlorination reactions in which the chlorine atoms are
replaced with hydrogen atoms. Because reductive dechlorination processes may
occur very slowly in the environment and chlorine position affects the...
The concept of placing high strength linear reinforcements in a
soil backfill to produce a vertical retaining structure is a recent idea
that has been applied with success at a number of locations. Rational
procedures have been developed for the design of these structures
when the reinforcements consist of long...
Unmanned aircraft systems (UAS), also known as drones, are an increasingly popular method of collecting surveying and mapping data. Two common drone-based mapping techniques are lidar and structure from motion (SfM) photogrammetry, and a frequently-heard (yet nearly impossible to answer) question is: “which is better?” The most common metric for...
Bio-cementation is a promising method for the liquefiable mitigation of loose saturated sands. In the improvement process a bacterium that can be found naturally in soil deposits is fed urea. The bacterium consumes and breaks down the urea to form ammonium and carbonate. In the presence of calcium, calcium carbonate...