Conference Papers
Science Quality and Integrity
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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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PHOTOLYSIS OF GOETHITE WITH SORBED LOW MOLECULAR WEIGHT CARBOXYLATES.
Goethite ( alpha -FeOOH) is a common mineral constituent of suspended and bed sediments in aquatic environments. Many types of naturally-occurring organic molecules, including organic carboxylates, are known to sorb to its surface. Carboxylates should be susceptable to photo-oxidation. An experimental program was conducted with systems containing adsorbed films of oxalate, citrate, tartrate, glyco
Authors
Marvin C. Goldberg, Kirkwood M. Cunningham
PLANNING FOR OPTICAL DISK TECHNOLOGY WITH DIGITAL CARTOGRAPHY.
Progress in the computer field continues to suggest that the transition from traditional analog mapping systems to digital systems has become a practical possibility. A major shortfall that still exists in digital systems is the need for very large mass storage capacity. The decade of the 1980's has introduced laser optical disk storage technology, which may be the breakthrough needed for mass sto
Authors
Donald L. Light
POTENTIAL FOR NITROSAMINE FORMATION RESULTING FROM THE USE OF RHODAMINE WT FOR TIME-OF-TRAVEL STUDIES: A COMBINED LABORATORY AND FIELD INVESTIGATION.
Rhodamine WT is used by surface water hydrologists for time of travel and dispersion studies in which flow characteristics of surface streams are determined. Surface water contamination by nitrosamines formed from Rhodamine WT and nitrite ion has been studied. A method for residue analysis of N-nitrosodiethylamine (NDEA) has been developed and evaluated using river samples spiked with Rhodamine WT
Authors
Sharon M. Johnson, Thomas R. Steinheimer
Potential primary and secondary hazards of avicides
There are six chemicals or groups of chemicals that are currently registered as avicides that can be used in some or all of the U.S. Most of these chemicals, because of their diverse chemical composition and innate toxicological effects, present somewhat different primary and secondary hazards to avian and mammalian predators and scavengers. Of the chemicals reviewed, all appear to present some de
Authors
E. W. Schafer
PREDICTING GROUND-WATER DRAINAGE TO SURFACE MINES.
A two-dimensional, finite-difference numerical model is used to simulate the drainage of ground water into a surface coal mine. Graphs of dimensionless head as a function of dimensionless distance, and dimensionless seepage flux as a function of dimensionless time are developed from results of the numerical modeling. Changes in seepage flux and ground-water levels can be estimated from the dimensi
Authors
Linda S. Weiss, Devin L. Galloway
PROCESSING OF SCANNED IMAGERY FOR CARTOGRAPHIC FEATURE EXTRACTION.
Digital cartographic data are usually captured by manually digitizing a map or an interpreted photograph or by automatically scanning a map. Both techniques first require manual photointerpretation to describe features of interest. A new approach, bypassing the laborious photointerpretation phase, is being explored using direct digital image analysis. Aerial photographs are scanned and color separ
Authors
Susan P. Benjamin, Leonard Gaydos
PROJECTED EFFECTS OF GROUND-WATER DEVELOPMENT IN THE SOUTHERN HIGH PLAINS OF TEXAS AND NEW MEXICO.
A digital ground-water flow model of the southern High Plains of Texas and New Mexico has been constructed. The calibrated model with the 1980 water level as the initial condition was used to project water levels to 2020. Estimated future pumpage based on the U. S. Economic Development Administration's economic study of the High Plains region was used in the model. Pumpage estimates were made for
Authors
Richard R. Luckey
QUANTIFICATION OF IN-SITU GAS HYDRATES WITH WELL LOGS.
This study evaluates in detail the expected theoretical log responses and the actual log responses within one stratigraphically controlled hydrate horizon in six wells spaced throughout the Kuparuk Oil Field. Detailed examination of the neutron porosity and sonic velocity responses within the horizon is included. In addition, the theoretical effect of the presence of hydrates on the neutron porosi
Authors
Timothy S. Collett, Sanjay P. Godbole, Christine Economides
RAINFALL-RUNOFF MECHANICS FOR DEVELOPED URBAN BASINS, SOUTH FLORIDA.
Rainfall-runoff data, collected by the US Geological Survey as part of an urban hydrology study in south Florida, were analyzed to find relations between depths of rainfall and basin runoff. Data were collected for about 300 runoff events on four different urban land-use basins - commercial, highway, single-family residential, and apartment. These data were collected from sewers that carried only
Authors
Robert A. Miller
Reaction rate kinetics for in situ combustion retorting of Michigan Antrim oil shale
The intrinsic reaction rate kinetics for the pyrolysis of Michigan Antrim oil shale and the oxidation of the carbonaceous residue of this shale have been determined using a thermogravimetric analysis method. The kinetics of the pyrolysis reaction were evaluated from both isothermal and nonisothermal rate data. The reaction was found to be second-order with an activation energy of 252.2 kJ/mole, an
Authors
M. Rostam-Abadi, R.W. Mickelson
RECENT DEVELOPMENTS IN PROSPECTOR AND FUTURE EXPERT SYSTEMS IN REGIONAL RESOURCE EVALUATION.
PROSPECTOR was developed to aid the geologist in evaluating the mineral potential of a site or an area. Recent developments include enhancements of the existing PROSPECTOR program and the creation of two new programs, muPROSPECTOR and HYDRO. It is predicted that PROSPECTOR and similar programs will develop most rapidly for applications which geologists feel ill-prepared to handle unaided and for f
Authors
Richard B. McCammon
RECOMMENDATIONS FROM THE DEPARTMENT OF THE INTERIOR - EEZ SYMPOSIUM.
The Presidential proclamation on March 10, 1983, of a 200-nautical-mile-wide Exclusive Economic Zone (EEZ) focuses attention on the mineral resources of a vast submarine area. The hard-mineral resources in the EEZ include shallow-water placer deposits, polymetallic sulfide deposits, and cobalt-enriched manganese crusts in deeper water. The petroleum resource potential of basins within the EEZ is o
Authors
Robert W. Rowland, Bonnie A. McGregor