Keith J Halford (Former Employee)
Science and Products
Filter Total Items: 63
Mathematical analysis demonstrates that interferons-β and -γ Interact in a multiplicative manner to disrupt herpes simplex virus replication
Several studies suggest that the innate interferons (IFNs), IFN-α and IFN-β, can act in concert with IFN-γto synergistically inhibit the replication of cytomegalovirus and herpes simplex virus type 1 (HSV-1). The significance of this observation is not yet agreed upon in large part because the nature and magnitude of the interaction between IFN-α/β and IFN-γ is not well defined. In the current stu
Authors
William P. Halford, Keith J. Halford, Amy T. Pierce
Geologic, hydrologic, and chemical data from the C aquifer near Leupp, Arizona
No abstract available.
Authors
J.P. Hoffmann, D. J. Bills, J. V. Phillips, K. J. Halford
Numerical simulation of aquifer tests, west-central Florida
No abstract available.
Authors
Dann K. Yobbi, Keith J. Halford
Estimates of natural ground-water discharge and characterization of water quality in Dry Valley, Washoe County, West-Central Nevada, 2002-2003
The Dry Valley Hydrographic Area is being considered as a potential source area for additional water supplies for the Reno-Sparks area, which is about 25 miles south of Dry Valley. Current estimates of annual ground-water recharge to Dry Valley have a considerable range. In undeveloped valleys, such as Dry Valley, long-term ground-water discharge can be assumed the same as long-term ground-water r
Authors
David L. Berger, Douglas K. Maurer, Thomas J. Lopes, Keith J. Halford
Plume-scale testing of a simplified method for detecting tritium contamination in plants and soil
Cost-effective methods are needed to detect contamination near radioactive-waste and other contaminated sites. Such methods should be capable of providing an early warning of contaminant releases and should be accurate and robust enough for assessing the long-term performance of waste-isolation facilities and remediation measures. Recently, a simplified method for detecting tritium contamination i
Authors
Brian J. Andraski, Keith J. Halford, Robert L. Michel
A unique approach to estimating lateral anisotropy in complex geohydrologic environments
Aquifers in fractured rock or karstic settings are likely to have anisotropic transmissivity distributions. Aquifer tests that are performed in these settings also are frequently affected by leakage from adjacent confining units. Finite-difference models such as MODFLOW are convenient tools for estimating the hydraulic characteristics of the stressed aquifer and adjacent confining units but are po
Authors
K. J. Halford, B. Campbell
Estimated Ground-Water Withdrawals from the Death Valley Regional Flow System, Nevada and California, 1913-98
Ground-water withdrawals from 1913 through 1998 from the Death Valley regional flow system have been compiled to support a regional, three-dimensional, transient ground-water flow model. Withdrawal locations and depths of production intervals were estimated and associated errors were reported for 9,300 wells. Withdrawals were grouped into three categories: mining, public-supply, and commercial wat
Authors
Michael T. Moreo, Keith J. Halford, Richard J. La Camera, Randell J. Laczniak
Geohydrology, Geochemistry, and Ground-Water Simulation-Optimization of the Central and West Coast Basins, Los Angeles County, California
Historical ground-water development of the Central and West Coast Basins in Los Angeles County, California through the first half of the 20th century caused large water-level declines and induced seawater intrusion. Because of this, the basins were adjudicated and numerous ground-water management activities were implemented, including increased water spreading, construction of injection barriers,
Authors
Eric G. Reichard, Michael Land, Steven M. Crawford, Tyler D. Johnson, Rhett R. Everett, Trayle V. Kulshan, Daniel J. Ponti, Keith L. Halford, Theodore A. Johnson, Katherine S. Paybins, Tracy Nishikawa
Hydrogeology and simulation of ground-water flow in the aquifers underlying Belvidere, Illinois
The U.S. Geological Survey investigated the
ground-water-flow system and distribution of
contaminants in the vicinity of Belvidere, Illinois,
during 1992?2000. The study included the
compilation, collection, and analyses of
hydrogeologic and water-quality data and
simulation of the ground-water-flow system.
Hydrogeologic data include lithologic,
stratigraphic, geophysical, hydraulic-proper
Authors
P.C. Mills, J.E. Nazimek, K. J. Halford, D. J. Yeskis
Documentation of spreadsheets for the analysis of aquifer-test and slug-test data
Several spreadsheets have been developed for the analysis of aquifer-test and slug-test data. Each spreadsheet incorporates analytical solution(s) of the partial differential equation for ground-water flow to a well for a specific type of condition or aquifer. The derivations of the analytical solutions were previously published. Thus, this report abbreviates the theoretical discussion, but includ
Authors
Keith J. Halford, Eve L. Kuniansky
User guide for the drawdown-limited, multi-node well (MNW) package for the U.S. Geological Survey's modular three-dimensional finite-difference ground-water flow model, versions MODFLOW-96 and MODFLOW-2000
A computer program called the drawdown-limited, Multi-Node Well (MNW) Package was developed for the U.S. Geological Survey three-dimensional finite-difference modular ground-water flow model, commonly referred to as MODFLOW. The MNW Package allows MODFLOW users to simulate wells that extend beyond a single model node. Multi-node wells can simulate wells that are completed in multiple aquifers or i
Authors
Keith J. Halford, Randall T. Hanson
Delineation of the Troy Bedrock Valley and particle-tracking analysis of ground-water flow underlying Belvidere, Illinois
The U.S. Geological Survey, U.S. Environmental Protection Agency, and Illinois Environmental Protection Agency began a study of the hydrogeology, flow system, and distribution of contaminants in the aquifers underlying Belvidere, Ill., and vicinity in 1992. As part of the study, the ancestral Troy Bedrock Valley, located about 1.5 miles west of Belvidere, was identified as an important part of the
Authors
P.C. Mills, Keith J. Halford, R.P. Cobb
Science and Products
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Filter Total Items: 63
Mathematical analysis demonstrates that interferons-β and -γ Interact in a multiplicative manner to disrupt herpes simplex virus replication
Several studies suggest that the innate interferons (IFNs), IFN-α and IFN-β, can act in concert with IFN-γto synergistically inhibit the replication of cytomegalovirus and herpes simplex virus type 1 (HSV-1). The significance of this observation is not yet agreed upon in large part because the nature and magnitude of the interaction between IFN-α/β and IFN-γ is not well defined. In the current stuAuthorsWilliam P. Halford, Keith J. Halford, Amy T. PierceGeologic, hydrologic, and chemical data from the C aquifer near Leupp, Arizona
No abstract available.AuthorsJ.P. Hoffmann, D. J. Bills, J. V. Phillips, K. J. HalfordNumerical simulation of aquifer tests, west-central Florida
No abstract available.AuthorsDann K. Yobbi, Keith J. HalfordEstimates of natural ground-water discharge and characterization of water quality in Dry Valley, Washoe County, West-Central Nevada, 2002-2003
The Dry Valley Hydrographic Area is being considered as a potential source area for additional water supplies for the Reno-Sparks area, which is about 25 miles south of Dry Valley. Current estimates of annual ground-water recharge to Dry Valley have a considerable range. In undeveloped valleys, such as Dry Valley, long-term ground-water discharge can be assumed the same as long-term ground-water rAuthorsDavid L. Berger, Douglas K. Maurer, Thomas J. Lopes, Keith J. HalfordPlume-scale testing of a simplified method for detecting tritium contamination in plants and soil
Cost-effective methods are needed to detect contamination near radioactive-waste and other contaminated sites. Such methods should be capable of providing an early warning of contaminant releases and should be accurate and robust enough for assessing the long-term performance of waste-isolation facilities and remediation measures. Recently, a simplified method for detecting tritium contamination iAuthorsBrian J. Andraski, Keith J. Halford, Robert L. MichelA unique approach to estimating lateral anisotropy in complex geohydrologic environments
Aquifers in fractured rock or karstic settings are likely to have anisotropic transmissivity distributions. Aquifer tests that are performed in these settings also are frequently affected by leakage from adjacent confining units. Finite-difference models such as MODFLOW are convenient tools for estimating the hydraulic characteristics of the stressed aquifer and adjacent confining units but are poAuthorsK. J. Halford, B. CampbellEstimated Ground-Water Withdrawals from the Death Valley Regional Flow System, Nevada and California, 1913-98
Ground-water withdrawals from 1913 through 1998 from the Death Valley regional flow system have been compiled to support a regional, three-dimensional, transient ground-water flow model. Withdrawal locations and depths of production intervals were estimated and associated errors were reported for 9,300 wells. Withdrawals were grouped into three categories: mining, public-supply, and commercial watAuthorsMichael T. Moreo, Keith J. Halford, Richard J. La Camera, Randell J. LaczniakGeohydrology, Geochemistry, and Ground-Water Simulation-Optimization of the Central and West Coast Basins, Los Angeles County, California
Historical ground-water development of the Central and West Coast Basins in Los Angeles County, California through the first half of the 20th century caused large water-level declines and induced seawater intrusion. Because of this, the basins were adjudicated and numerous ground-water management activities were implemented, including increased water spreading, construction of injection barriers,AuthorsEric G. Reichard, Michael Land, Steven M. Crawford, Tyler D. Johnson, Rhett R. Everett, Trayle V. Kulshan, Daniel J. Ponti, Keith L. Halford, Theodore A. Johnson, Katherine S. Paybins, Tracy NishikawaHydrogeology and simulation of ground-water flow in the aquifers underlying Belvidere, Illinois
The U.S. Geological Survey investigated the ground-water-flow system and distribution of contaminants in the vicinity of Belvidere, Illinois, during 1992?2000. The study included the compilation, collection, and analyses of hydrogeologic and water-quality data and simulation of the ground-water-flow system. Hydrogeologic data include lithologic, stratigraphic, geophysical, hydraulic-properAuthorsP.C. Mills, J.E. Nazimek, K. J. Halford, D. J. YeskisDocumentation of spreadsheets for the analysis of aquifer-test and slug-test data
Several spreadsheets have been developed for the analysis of aquifer-test and slug-test data. Each spreadsheet incorporates analytical solution(s) of the partial differential equation for ground-water flow to a well for a specific type of condition or aquifer. The derivations of the analytical solutions were previously published. Thus, this report abbreviates the theoretical discussion, but includAuthorsKeith J. Halford, Eve L. KunianskyUser guide for the drawdown-limited, multi-node well (MNW) package for the U.S. Geological Survey's modular three-dimensional finite-difference ground-water flow model, versions MODFLOW-96 and MODFLOW-2000
A computer program called the drawdown-limited, Multi-Node Well (MNW) Package was developed for the U.S. Geological Survey three-dimensional finite-difference modular ground-water flow model, commonly referred to as MODFLOW. The MNW Package allows MODFLOW users to simulate wells that extend beyond a single model node. Multi-node wells can simulate wells that are completed in multiple aquifers or iAuthorsKeith J. Halford, Randall T. HansonDelineation of the Troy Bedrock Valley and particle-tracking analysis of ground-water flow underlying Belvidere, Illinois
The U.S. Geological Survey, U.S. Environmental Protection Agency, and Illinois Environmental Protection Agency began a study of the hydrogeology, flow system, and distribution of contaminants in the aquifers underlying Belvidere, Ill., and vicinity in 1992. As part of the study, the ancestral Troy Bedrock Valley, located about 1.5 miles west of Belvidere, was identified as an important part of theAuthorsP.C. Mills, Keith J. Halford, R.P. Cobb - Software