Microbial parameters were studied in the plaque of 88 subjects between the ages of 14 and 17 years who had rinsed daily with either 0.1% stannous fluoride or 0.05% sodium fluoride for 28 months. Plaque was collected from specific sites, dispersed, diluted, and cultured to estimate total numbers of plaque organisms and proportions of streptococci, Streptococcus mutans and Veillonella. While prio...

Field tests indicate that temporary well shut-ins may enhance oil recovery from a shale reservoir; however, there is currently no systematic research to specifically guide such detailed operations in the field, especially for design of shut-in scheme and multiple rounds shut-ins. In this study, applicability reservoirs studied, numerical model built using finite element method. order simulate p...

Four major paired terraces and six short local terraces have been identified along the Maumee River valley between the Ohio-Indiana state line and Perrysburg in northwestern Ohio by detailed field mapping and study of gaging-station records, water-well logs, and soils data. From highest to lowest, the paired terraces have been named the Antwerp, Florida, Napoleon, and Grand Rapids terraces. The...

The Riemann problem for a general inhomogeneous system of conservation laws is solved in a neighborhood of a state at which one of the nonlinear waves in the problem takes on a zero speed. The inhomogeneity is modeled by a linearly degenerate field. The solution ofthe Riemann problem determines the nature of wave interactions, and thus the Riemann problem serves as a canonical form for nonlinea...

Machine learning (ML) techniques have drawn much attention in the engineering community due to recent advances computational and an enabling environment. However, often they are treated as black-box tools, which should be examined for their robustness range of validity/applicability. This research presents evaluation application flow/transport porous media, where exact solutions (obtained from ...

Abstract A time-continuous (tc-)embedding method is first proposed for solving nonlinear scalar hyperbolic conservation laws with discontinuous solutions (shocks and rarefaction waves) on codimension 1, connected, smooth, closed manifolds (surface PDEs or SPDEs in $${\mathbb {R}}^2$$ R <...

The New Haven County Medical Society was founded in 1784, and in 1788 the members published what Garrison describes as "a thin little volume" entitled "Cases and Observations; by the Medical Society of New Haven County". The volume is of interest to us not only because of its contents, contributed, with one exception, by well-known practitioners of New Haven County, but also because it was the ...

The migration and entrapment of dense nonaqueous phase liquids (DNAPLs) in aquifer formations is typically believed to be controlled by physical heterogeneities. This belief is based upon the assumption that permeability and capillary properties are determined by the soil texture. Capillarity and relative permeability, however, will also depend on porous medium wettability characteristics. This...

Natural reservoirs are porous and permeable rocks containing deposits of hydrocarbons (oil reservoirs) or pure water (aquifers). Porosity and permeability are the most important physical properties of reservoirs that affect flow and transport. In general these geological parameters are stochastically modeled (see [?, ?] and references therein). As a consequence the equations governing flow and ...