Malcolm D. Siegel

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The couplings among chemical reaction rates, advective and diffusive transport in fractured media or soils, and changes in hydraulic properties due to precipitation and dissolution within fractures and in rock matrix are important for both nuclear waste disposal and remediation of contaminated sites. This paper describes the development and application of(More)
The effects of the choice of reference populations on standardized mortality ratios and standardized incidence ratios (SMRs and SIRs) are demonstrated in an ecological study of the relationship between bladder cancer and exposure to arsenic in drinking water. Data from the Surveillance, Epidemiology and End Results (SEER) and the Center for Disease Control(More)
Platy intergrowths of crystalline todorokite are associated with biogenic debris in the cores of manganese nodules from a site in the Pacific Ocean. Analyses by electron diffraction and transmission electron microscopy demonstrate that this material is composed of tunnels of chains of linked MnO(6) octahedra. The chemical composition, morphology, and(More)
This chapter presents the development of the latest version of HYDROGEOCHEM. HYDROGEOCHEM is a multi-dimensional numerical model of coupled fluid flow, thermal transport, hydrologic transport, and biogeochemical kinetic/equilibrium reactions in saturated/unsaturated media. It iteratively solves the Richards equation for fluid flow, thermal transport(More)
There are two different ways to model reactive transport: ad hoc and innovative reaction-based approaches. The former, such as the Kd simplification of adsorption, has been widely employed by practitioners, while the latter has been mainly used in scientific communities for elucidating mechanisms of biogeochemical transport processes. It is believed that(More)
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