Relationships between surface waters and groundwaters at basin scale are rarely investigated but have important implications for water resource development management. Here, we integrate evidence from geochemical tracers piezometry to advance the understanding of regional-scale, groundwater–surface interactions in River Awash Basin Ethiopia. Hydrological characteristics consistent with those ob...

T he effective geological storage of fluid CO2 in porous subsurface rock will require the ability to track, and identify the origin of, any CO2 seepage measured at the near surface. In a study relevant to postemplacement seepage, we examine natural CO2 springs around Green River on the Colorado Plateau, United States, in an attempt to determine theCO2 origins.Weuse a combination of natural geoc...

Positron emission tomography (PET) imaging using 2-deoxy-2-[F-18]fluoro-D-glucose (FDG) has proven valuable in the diagnosis, staging and restaging for many cancers. However, its application for liver cancer has remained limited owing in part to the relatively high background uptake of the tracer in the liver plus the significant variability of the tumor specific uptake in liver cancer among pa...

Amide bonds are fundamental products in biochemistry, forming peptides critical to protein formation, but amide also detected sterile environments and abiotic synthesis experiments. The formation of may represent a prerequisite the origin life. Here we report thermodynamic models that predict optimal conditions for bond across geologically relevant ranges temperature, pressure, pH. We modeled a...

-This paper presents the design and development of a Geochemical Expert System prototype (GES) for analyzing solution-mineral interactions in nature. The emphasis is placed on expert system design and knowledge representation. One of the most challenging and research-intensive steps was the identification of the key geochemical characteristics that would enable the expert system to identify sal...

We present a new geometrical method capable of quantifying and illustrating the outcomes three-component mixing dynamics. In scenario, classical algebraic equations endmember analysis (EMMA) can be used to quantify contributions from each fraction. Three-component natural waters, either in an element–element plot or by using EMMA subspace is described triangular shaped distribution sample point...

The development of a reliable and accurate method to predict thermal breakthrough time is a significant open problem in geothermal reservoir engineering. Such a method would enable more informed decisions to be made regarding reservoir management. Methods developed at present include analytical models and solute tracers, both of which have limitations. The use of particles as temperaturesensiti...