Institution
United States Environmental Protection Agency
Government•Washington D.C., District of Columbia, United States•
About: United States Environmental Protection Agency is a government organization based out in Washington D.C., District of Columbia, United States. It is known for research contribution in the topics: Population & Environmental exposure. The organization has 13873 authors who have published 26902 publications receiving 1191729 citations. The organization is also known as: EPA & Environmental Protection Agency.
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TL;DR: In this article, the performance of several variations on ordinary kriging and inverse distance estimators is evaluated, and mean squared errors (MSE) are calculated for estimates made on multiple resamplings from five exhaustive data bases representing two distinctly different types of estimation problem.
Abstract: The performance of several variations on ordinary kriging and inverse distance estimators is evaluated. Mean squared errors (MSE) were calculated for estimates made on multiple resamplings from five exhaustive data bases representing two distinctly different types of estimation problem. Ordinary kriging, when performed with variograms estimated from the sample data, was more robust than inverse-distance methods to the type of estimation problem, and to the choice of estimation parameters such as number of neighbors.
255 citations
TL;DR: In this paper, a non-metal-doped TiO2 nanoparticles (N-F-TiO2) was developed by a novel synthesis route employing a simple sol-gel method containing a nonionic fluorosurfactant as pore template material to tailor-design the structural properties of TiO 2 and fluorine dopant as well as ethylenediamine as nitrogen source for the photocatalytic response towards visible light.
255 citations
Helmholtz Centre for Environmental Research - UFZ1, RWTH Aachen University2, Stockholm University3, Norwegian Institute for Water Research4, Öko-Institut5, United States Environmental Protection Agency6, James I University7, Environment Canada8, Masaryk University9, Swiss Federal Institute of Aquatic Science and Technology10, Radboud University Nijmegen11, Fraunhofer Society12, University of Koblenz and Landau13, Environment Agency14, Wageningen University and Research Centre15, Utrecht University16, VU University Amsterdam17
TL;DR: 10 recommendations to improve monitoring and to strengthen comprehensive prioritization, to foster consistent assessment and to support solution-oriented management of surface waters are given.
254 citations
TL;DR: It would seem that if humans develop thyroid tumors following long-term derangement in thyroid-pituitary status, they may be less sensitive than the commonly used animal models.
254 citations
TL;DR: In this paper, the AVIRIS instrument was used to evaluate mine waste at the California Gulch Superfund Site near Leadville, CO. Laboratory leach tests of surface samples showed that leachate pH is most acidic and metals most mobile in samples from the inner jarosite zone and that leACHate pH was near neutral and metals least mobile in sample from the outer goethite zone.
Abstract: The process of pyrite oxidation at the surface of mine waste may produce acidic water that is gradually neutralized as it drains away from the waste, depositing different Fe-bearing secondary minerals in roughly concentric zones that emanate from mine-waste piles. These Fe-bearing minerals are indicators of the geochemical conditions under which they form. Airborne and orbital imaging spectrometers can be used to map these mineral zones because each of these Fe-bearing secondary minerals is spectrally unique. In this way, imaging spectroscopy can be used to rapidly screen entire mining districts for potential sources of surface acid drainage and to detect acid producing minerals in mine waste or unmined rock outcrops. Spectral data from the AVIRIS instrument were used to evaluate mine waste at the California Gulch Superfund Site near Leadville, CO. Laboratory leach tests of surface samples show that leachate pH is most acidic and metals most mobile in samples from the inner jarosite zone and that leachate pH is near-neutral and metals least mobile in samples from the outer goethite zone.
254 citations
Authors
Showing all 13926 results
| Name | H-index | Papers | Citations |
|---|---|---|---|
| Joel Schwartz | 183 | 1149 | 109985 |
| Timothy A. Springer | 167 | 669 | 122421 |
| Chien-Jen Chen | 128 | 655 | 66360 |
| Matthew W. Gillman | 126 | 529 | 55835 |
| J. D. Hansen | 122 | 975 | 76198 |
| Dionysios D. Dionysiou | 116 | 675 | 48449 |
| John P. Giesy | 114 | 1162 | 62790 |
| Douglas W. Dockery | 105 | 244 | 57461 |
| Charles P. Gerba | 102 | 692 | 35871 |
| David A. Savitz | 99 | 572 | 32947 |
| Stephen Polasky | 99 | 354 | 59148 |
| Judith C. Chow | 96 | 427 | 32632 |
| Diane R. Gold | 95 | 443 | 30717 |
| Scott L. Zeger | 95 | 377 | 78179 |
| Rajender S. Varma | 95 | 672 | 37083 |