Biomedical subjects

Kenneth Y Lee

Publications and source records attributed to Kenneth Y Lee.

4 recordsLinked to original sources

PubMed2005

Dissolution of a multicomponent DNAPL pool in an experimental aquifer.

This paper presents the results from a well-defined, circular-shaped, multicomponent dense nonaqueous phase liquid (DNAPL) pool dissolution experiment conducted in a three-dimensional, bench scale model aquifer. The multicomponent pool is a mixture of tetrachloroethylene (PCE) and 1,1,2-trichloroethane (1,1,2-TCA); PCE was the major component and 1,1,2-TCA was the minor component. Downgradient plume concentrations were measured at five specific locations over time until the majority of the 1,1,2-TCA was depleted from the DNAPL pool source. The experimental results suggest distinct spatial-temporal plume patterns for minor DNAPL components versus major DNAPL components. The downgradient concentration varied over time for 1,1,2-TCA while a stable plume developed for PCE. A semi-analytical solution for contaminant transport resulting from dissolution of multicomponent nonaqueous phase liquid pools successfully simulated the plume structure and dynamics for both the major and minor DNAPL components.

Fresh Water↗

PubMed2004

The voluntary siting process, a case study in New Jersey.

The Low-Level Radioactive Waste Policy Act of 1980 and its 1985 Amendments has not provided new disposal capacity within the United States; however, sufficient disposal capacity currently exists to handle today's disposal needs. Politics, opposition groups, and public mistrust in government have combined to limit the possibilities for establishing new disposal facilities. In 2000, New Jersey (NJ and Connecticut (CT), as members of the Northeast Compact for the disposal of low-level radioactive waste, admitted South Carolina (SC) to their compact, renaming it as the "Atlantic Compact." The advantage to SC is that they are able to prevent disposal of waste from outside the Compact. The advantage to NJ and CT is that they are guaranteed waste disposal for approximately the next 50 years, or until all currently operating nuclear power plants in the states are decommissioned. This paper details the process, much of it not following the scientific method, to try to site a low-level waste facility in NJ. With the formation of the NJ Siting Board in 1987, an effort was made to locate a site using deterministic criteria; however, in 1992, the Board shifted to a voluntary process. In 1998, the Board made the determination that there was adequate capacity for waste disposal and ended active siting. In 2000, the opportunity to form the Atlantic Compact ended siting through an out-of-state solution. While it is not clear that the voluntary process would have ultimately worked in NJ, it has worked in Canada and the process may be one of the few mechanisms for the siting of any type of hazardous material disposal facility. Also, other states still have to decide what they will do after 2008 when Barnwell is no longer open to them.

Clinical Trials Data Monitoring Committees↗

PubMed2003

Mass transfer coefficient and concentration boundary layer thickness for a dissolving NAPL pool in porous media.

Analytical expressions for the time invariant, average mass transfer coefficient and the concentration boundary layer thickness applicable to dissolving single-component nonaqueous phase liquid (NAPL) pools in two-dimensional, saturated, homogeneous and isotropic porous formations are derived. Good agreement between predicted and experimentally determined time invariant average mass transfer coefficients is observed.

Forecasting↗

PubMed2002

Dissolution of a well-defined trichloroethylene pool in saturated porous media: experimental results and model simulations.

An experimental mass transfer correlation was developed for trichloroethylene (TCE) pools dissolving in water-saturated porous media. A three-dimensional, bench-scale model aquifer previously designed by Chrysikopoulos et al. (Water Resour. Res. 36(7) (2000) 1687) was employed for collection of the experimental dissolution data. The unique aspect of the model aquifer design is the formation of a well-defined, circular TCE pool at the bottom of the model aquifer. Steady-state dissolved TCE concentrations at specific downstream locations within the aquifer were collected for each of the seven interstitial velocities considered in this study. For each interstitial velocity, a corresponding time invariant overall mass transfer coefficient was determined by fitting the experimental data to an analytical solution applicable to nonaqueous phase liquid (NAPL) pools (Water Resour. Res. 31(4) (1995) 1137). Subsequently, a correlation relating the time invariant overall Sherwood number to appropriate overall Peclet numbers was developed. Relatively good agreement between the newly developed correlation and experimental data was observed.

Forecasting↗