In the 1980s and 1990s, the development of oxygen ion conductors for solid electrolytes, as well as mixed oxygen–electron conductors as electrodes for solid oxide fuel cells, brought scientists to envision a possibility of mixed-conducting oxygenpermeable ceramic membranes. Today this field is well established, and ceramic membranes are close to implementation in processes for oxygen extraction...

In this study, electrical resistivity was applied in six 400 m profiles around the Hulene-B waste dump (Mozambique). Afterwards, an inversion performed by RES2Dinv. The use of method allowed us to characterize detail some underlying aspects DRASTIC index identifying anomalous zones considered be permeable and prone leachate migration. modified revealed high values areas near contaminated surfac...

Despite a multitude of small catchment studies, we lack deep understanding how variations in critical zone architecture lead to hydrologic states and fluxes. This study characterizes dynamics 15 catchments the U.S. Critical Zone Observatory (CZO) network where hypothesized that our subsurface structure would illuminate patterns partitioning. The CZOs collect data sets characterize physical, che...

Domestic wells in North America and elsewhere are typically constructed at relatively shallow depths and with the sand or gravel pack extending far above the intake screen of the well (shallow well seal). The source areas of these domestic wells and the effect of an extended gravel pack on the source area are typically unknown, and few resources exist for estimating these. In this article, we u...

This paper explores strong indirect evidence for existence of a previously unrecognized deep groundwater aquifer in southern Quintana Roo, adjacent parts Campeche, and (probably) northern Belize. The region contains rocks Cretaceous-to-Holocene age, including: 1) an up-thrust block the late Cretaceous carbonate known Belize as Barton Creek Formation, which is oldest formation exposed Mexican Yu...

This article is the result of studies rheological properties and reactivity acid solutions technical lignosulfonate, decationized lignosulfonic acid, hydrochloric with addition lignosulfonate. Compositions that include lignosulfonate can be used as displacement agents in development watered layers inhomogeneous reservoir properties. The use thickening additives solves several problems. Slowing ...

A symplectic toric orbifold is a compact connected orbifold M , a symplectic form ω on M , and an effective Hamiltonian action of a torus T on M , where the dimension of T is half the dimension of M . We prove that there is a one-to-one correspondence between symplectic toric orbifolds and convex rational simple polytopes with positive integers attached to each facet.