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Research Centers: Recent submissions
Now showing items 221-240 of 241
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Sensitivity and resolution of tomographic pumping tests in an alluvial aquifer
(American Geophysical Union, 2009-02-14)[1] Various investigators have proposed hydraulic tomography, the simultaneous analysis of responses to multiple well tests, as a means to obtain a high-resolution characterization of aquifer flow properties. This study ... -
Steady shape analysis of tomographic pumping tests for characterization of aquifer heterogeneities
(American Geophysical Union, 2002-12-31)[1] Hydraulic tomography, a procedure involving the performance of a suite of pumping tests in a tomographic format, provides information about variations in hydraulic conductivity at a level of detail not obtainable with ... -
Variable-rate pumping tests for radially symmetric nonuniform aquifers
(American Geophysical Union, 1990-02)Conventional pumping test methodology is of limited effectiveness for defining the spatial distribution of aquifer properties because of the nonuniqueness of the parameter estimates. Sensitivity analysis can be used to ... -
Slug tests in partially penetrating wells
(American Geophysical Union, 1994-11)A semianalytical solution is presented to a mathematical model describing the flow of groundwater in response to a slug test in a confined or unconfined porous formation. The model incorporates the effects of partial ... -
Pumping tests in nonuniform aquifers: The radially asymmetric case
(American Geophysical Union, 1993-02)An analytical solution for the case of transient, pumping-induced drawdown in a nonuniform aquifer is presented. The nonuniform aquifer is conceptualized as a uniform matrix into which a disk of anomalous properties has ... -
Pumping tests in networks of multilevel sampling wells: Motivation and methodology
(American Geophysical Union, 1999-11)The identification of spatial variations in hydraulic conductivity (K) on a scale of relevance for transport investigations has proven to be a considerable challenge. Recently, a new field method for the estimation of ... -
Relative importance of dispersion and rate-limited mass transfer in highly heterogeneous porous media: Analysis of a new tracer test at the Macrodispersion Experiment (MADE) site
(American Geophysical Union, 2010-03-20)[1] A single-well injection-withdrawal (SWIW) bromide tracer test was conducted to further investigate transport processes at the Macrodispersion Experiment (MADE) site on Columbus Air Force Base in Mississippi. The bromide ... -
Simulation assessment of the direct-push permeameter for characterizing vertical variations in hydraulic conductivity
(American Geophysical Union, 2008-02-22)[1] The direct-push permeameter (DPP) is a tool for the in situ characterization of hydraulic conductivity (K) in shallow, unconsolidated formations. This device, which consists of a short screened section with a pair of ... -
A field assessment of the value of steady shape hydraulic tomography for characterization of aquifer heterogeneities
(American Geophysical Union, 2007-05-22)[1] Hydraulic tomography is a promising approach for obtaining information on variations in hydraulic conductivity on the scale of relevance for contaminant transport investigations. This approach involves performing a ... -
A field investigation of phreatophyte-induced fluctuations in the water table
(American Geophysical Union, 2007-02-07)[1] Hydrographs from shallow wells in vegetated riparian zones frequently display a distinctive pattern of diurnal water table fluctuations produced by variations in plant water use. A multisite investigation assessed the ... -
Estimation of groundwater consumption by phreatophytes using diurnal water table fluctuations: A saturated-unsaturated flow assessment
(American Geophysical Union, 2005-07-27)[1] Groundwater consumption by phreatophytes is a difficult-to-measure but important component of the water budget in many arid and semiarid environments. Over the past 70 years the consumptive use of groundwater by ... -
Hydraulic tests in highly permeable aquifers
(American Geophysical Union, 2004-12-04)[1] A semianalytical solution is presented for a mathematical model describing the flow of groundwater in response to a slug or pumping test in a highly permeable, confined aquifer. This solution, which is appropriate for ... -
Steady shape analysis of tomographic pumping tests for characterization of aquifer heterogeneities
(American Geophysical Union, 2002-12-31)[1] Hydraulic tomography, a procedure involving the performance of a suite of pumping tests in a tomographic format, provides information about variations in hydraulic conductivity at a level of detail not obtainable with ... -
Pumping-induced leakage in a bounded aquifer: An example of a scale-invariant phenomenon
(American Geophysical Union, 2003-12-05)[1] A new approach is presented for calculation of the volume of pumping-induced leakage entering an aquifer as a function of time. This approach simplifies the total leakage calculation by extending analytical-based methods ... -
An osmium nitrido complex as a π-acid ligand for late transition metals
(Royal Society of Chemistry, 1998)The Os(VI) nitrido complex, TpOs(N)Cl2 (1), acts as a π-acid ligand in the cobalt and platinum complexes CpCo[NOs(Tp)Cl2]2 (2) and (Me2S)Cl2Pt–N[triple bond, length half m-dash]Os(Tp)Cl2 (3). -
The plug-based nanovolume Microcapillary Protein Crystallization System (MPCS)
(International Union of Crystallography, 2008)The Microcapillary Protein Crystallization System (MPCS) embodies a new semi-automated plug-based crystallization technology which enables nanolitre-volume screening of crystallization conditions in a plasticware format ... -
Dynamic interpretation of slug tests in highly permeable aquifers
(American Geophysical Union, 2002-03-21)[1] Considerable progress has been made in developing a theoretical framework for modeling slug test responses in formations with high hydraulic conductivity K. However, several questions of practical significance remain ... -
A field assessment of the value of steady shape hydraulic tomography for characterization of aquifer heterogeneities
(American Geophysical Union, 2007-05-22)[1] Hydraulic tomography is a promising approach for obtaining information on variations in hydraulic conductivity on the scale of relevance for contaminant transport investigations. This approach involves performing a ... -
Ecstasy: 3,4-Methylenedioxymethamphetamine (MDMA)
(International Union of Crystallography, 1998-02)The crystal structure of 3,4-methylenedioxymethamphetamine {systematic name: N-methyl-l-[3,4-(methylenedioxy) phenyl]-2-aminopropane } hydrochloride, C 11H 15 - NO2.HC1, also known as 'ecstasy' or MDMA, has been determined ... -
Ethnic differences in medicinal plant use among University students: a cross-sectional survey of self-reported medicinal plant use at two Midwest Universities
(BioMed Central, 2015)Background Numerous surveys of medicinal plant use among college students abound, but none compare use between students enrolled in two different Universities with significantly different ethnic compositions. The objective ...