Measuring the benefits of GIS use
Stephen R. Gillespie
1991, Conference Paper, GIS/LIS 1991 ACSM-ASPRS Fall Convention
The key to objectively measuring the benefits of GIS use is to realize that there are two different types of benefits and that different techniques must be used to measure each. Efficiency benefits occur when the same task previously done without the GIS can be done less expensively with the...
Seismicity and shear strain in the southern Great Basin of Nevada and California
J. Gomberg
1991, Journal of Geophysical Research (96) 16383-16399
This study examines the relationship between the distribution of small earthquakes (ML≤4.3) and mechanisms of strain accumulation and relaxation in an area with long repeat times between large events, the Southern Great Basin Seismic Network (SGBSN) region. The Great Basin is a unique continental extensional...
Automated urban change detection using scanned cartographic and satellite image data
Jeffrey D. Spooner
1991, Conference Paper, GIS/LIS 1991 ACSM-ASPRS Fall Convention
The objective of this study was to develop a digital procedure to measure the amount of urban change that has occurred in an area since the publication of its corresponding 1:24,000-scale topographic map. Traditional change detection techniques are dependent upon the visual comparison of high-altitude aerial photographs or, more recently,...
Chloride cycling in two forested lake watersheds in the west-central Adirondack Mountains, New York, U.S.A.
N.E. Peters
1991, Water, Air, & Soil Pollution (59) 201-215
The chemistry of precipitation, throughfall, soil water, ground water, and surface water was evaluated in two forested lake-watersheds over a 4-yr period to assess factors controlling C1- cycling. Results indicate that C1- cycling in these watersheds is more complex than the generally held view of the rapid transport of atmospherically...
Intrusion of horizontal dikes: tectonic significance of Middle Proterozoic diabase sheets widespread in the upper crust of the southwestern United States
K. A. Howard
1991, Journal of Geophysical Research (96) 12461-12478
Initially horizontal sheet intrusions of Middle Proterozoic diabase are abundant in a region 650 by 300 km across in Arizona and California. The diabase forms discordant sheets in basement granite and gneiss and sills in overlying shelf sedimentary sequences. Massive granite is the most common...
Examination of micrinite concentrates from the Cannel City coal bed of eastern Kentucky: Proposed mechanism of formation
D.N. Taulbee, J.C. Hower, S.F. Greb
1991, Organic Geochemistry (17) 557-565
A high volatile B, micrinite-rich bituminous coal from Morgan County, Kentucky, was crushed and screened to −100 mesh, demineralized and subjected to density gradient centrifugation (DGC). In an initial density separation, micrinite concentration was increased from 52 vol% in the demineralized coal to a maximum of 67% in the 1.25–1.26...
A review of the regional geophysics of the Arizona Transition Zone
J. D. Hendricks, J. B. Plescia
1991, Journal of Geophysical Research (96) 12351-12373
A review of existing geophysical information and new data presented in this special section indicate that major changes in crustal properties between the Basin and Range and Colorado Plateau occur in, or directly adjacent to, the region defined as the Arizona Transition Zone. Although this region...
Release of 226Ra from uranium mill tailings by microbial Fe(III) reduction
E. R. Landa, Elizabeth J.P. Phillips, Derek R. Lovley
1991, Applied Geochemistry (6) 647-652
Uranium mill tailings were anaerobically incubated in the presence of H2 with Alteromonas putrefaciens, a bacterium known to couple the oxidation of H2 and organic compounds to the reduction of Fe(III) oxides. There was a direct correlation between the extent of Fe(III) reduction and...
Facies development in the Lower Freeport coal bed, west-central Pennsylvania, U.S.A.
B.S. Pierce, R.W. Stanton, C.F. Eble
1991, International Journal of Coal Geology (18) 17-43
The Lower Freeport coal bed in west-central Pennsylvania is interpreted to have formed within a lacustrine-mire environment. Conditions of peat formation, caused by the changing chemical and physical environments, produced five coal facies and two mineral-rich parting facies within the coal...
Rock chemistry and fluid inclusion studies as exploration tools for ore deposits in the Sila batholith, southern Italy
B. de Vivo, R. A. Ayuso, H. E. Belkin, A. Lima, A. Messina, A. Viscardi
1991, Journal of Geochemical Exploration (40) 291-310
The Sila batholith is the focus of an extensive petrogenetic research program, which includes an assessment of its potential to host granite-related ore deposits. Univariate and multivariate statistical techniques were applied to major- and minor-element rock geochemical data. The analysis indicates...
Subyearling American shad concentrate in swifter current in the upper Delaware River
R. M. Ross, T. W. H. Backman
1991, Research Information Bulletin 58
No abstract available....
Climate Divisions
National Climatic Data Center
1991, Report
This is a coverage of climate divisions from the National Climatic Data Center....
On seismological moments and magnitudes
B. A. Bolt
1991, Earthquakes & Volcanoes (USGS) (22) 111-112
My approach to seismology over the years has always been from the point of view of applied mathematics, as exemplified broadly by the work of the late Sir Harold Jeffreys and Professor K. E. Bullen. Both stresses the development of mathematics in the context of physical systems and of modeling,...
Low-flow and flow-duration characteristics of Mississippi streams
P. A. Telis
1991, Water-Resources Investigations Report 90-4087
No abstract available....
Chemometric comparison of polychlorinated biphenyl residues and toxicologically active polychlorinated biphenyl congeners in the eggs of Forster's Terns (Sterna fosteri)
Ted R. Schwartz, David L. Stalling
1991, Archives of Environmental Contamination and Toxicology (20) 183-199
The separation and characterization of complex mixtures of polychlorinated biphenyls (PCBs) is approached from the perspective of a problem in chemometrics. A technique for quantitative determination of PCB congeners is described as well as an enrichment technique designed to isolate only those congener residues which induce mixed aryl hydrocarbon...
A FORTRAN program for interpretation of relative permeability from unsteady-state displacements with capillary pressure included
E.O. Udegbunam
1991, Computers & Geosciences (17) 1351-1357
This paper presents a FORTRAN program for the determination of two-phase relative permeabilities from unsteady-state displacement data with capillary pressure terms included. The interpretative model employed in this program combines the simultaneous solution of a variant of the fractional flow equation which includes a capillary pressure term and an integro-differential...
U-series ages of solitary corals from the California coast by mass spectrometry
Martin Stein, G.J. Wasserburg, K. R. Lajoie, J.-H. Chen
1991, Geochimica et Cosmochimica Acta (55) 3709-3722
The purpose of this study is to evaluate the feasibility of dating fossil solitary corals from Pleistocene marine strandlines outside tropical latitudes using the recently developed high sensitivity, high-precision U-series technique based on thermal-ionization mass-spectrometry (TIMS). The TIMS technique is much more efficient than conventional a spectrometry and, as a...
Rapid classification of nuclear cataracts lake trout
H. L. Kincaid, G.T. Calkins
1991, Progressive Fish-Culturist (53) 120-124
To examine lake trout (Salvelinus namaycush) in the field for cataract and noncataract eye abnormalities, we developed a procedure with a circular 1.7‐power illuminated magnifying lamp. A box in which the lamp is mounted facilitates its transport and provides a support base for the lamp during use in the field....
S-layer positive motile aeromonads isolated from channel catfish
L.A. Ford
1991, Journal of Wildlife Diseases (27) 557-561
Motile aeromonads are ubiquitous aquatic bacteria that can cause motile aeromonad septicemia (MAS), a disease which affects channel catfish and can produce significant economic loss. Motile aeromonads isolated from commercially-raised channel catfish were screened for production of S-layer protein in order to evaluate...
The role of the diagnostic laboratory in fish disease control
Douglas P. Anderson, P. J. Barney
1991, Annual Review of Fish Diseases (1) 41-62
The diagnostic laboratory is becoming increasingly important to the productivity and profitability of hatcheries, fish farms, and aquaculture stations. The basic function of the laboratory personnel is to isolate and identify viral, bacterial, protozoan, and other fish pathogens present in cultured and feral fish stocks. New, rapid and accurate methods...
Fluid inclusion gas chemistry as a potential minerals exploration tool: Case studies from Creede, CO, Jerritt Canyon, NV, Coeur d'Alene district, ID and MT, southern Alaska mesothermal veins, and mid-continent MVT's
G. P. Landis, A. H. Hofstra
1991, Journal of Geochemical Exploration (42) 25-59
Recent advances in instrumentation now permit quantitative analysis of gas species from individual fluid inclusions. Fluid inclusion gas data can be applied to minerals exploration empirically to establish chemical (gas composition) signatures of the ore fluids, and conceptually through the development...
An aem-tem study of weathering and diagenesis, Abert Lake, Oregon: I. Weathering reactions in the volcanics
J.F. Banfield, B.F. Jones, D.R. Veblen
1991, Geochimica et Cosmochimica Acta (55) 2781-2793
Abert Lake in south-central Oregon provides a site suitable for the study of sequential weathering and diagenetic events. In this first of two papers, transmission electron microscopy was used to characterize the igneous mineralogy, subsolidus alteration assemblage, and the structural and chemical aspects of silicate weathering reactions that occur in...
Developmental differences in the responsiveness of gill Na+, K+ and -ATPase to cortisol salmonids
S. D. McCormick, Walton W. Dickhoff, J. Duston, R. S. Nishioka, H. A. Bern
1991, General and Comparative Endocrinology (84) 308-317
The ability of cortisol to increase gill Na+, K+-ATPase activity was examined in several salmonid species during development. Coho salmon (Oncorhynchus kisutch) parr were unresponsive to cortisol in vitro (10 μg/ml for 2 days) in November. Responsiveness was significant from January to March, peaking in January just prior to seasonal increases in...
Towable cage for studies of smoltification in Atlantic salmon
D. V. Rottiers
1991, Progressive Fish-Culturist (53) 124-127
The floating towable cage described in this report was used successfully to hold and transport Atlantic salmon (Salmo salar) in estuarine waters. These rugged and versatile cages, constructed from readily available, inexpensive materials, were tied singly and in clusters to floating docks in fresh and brackish water, where they withstood...
A geochemical model of the Platanares geothermal system, Honduras
C. J. Janik, A.H. Truesdell, F. Goff, L. Shevenell, M.L. Stallard, P.E. Trujillo Jr., D. Counce
1991, Journal of Volcanology and Geothermal Research (45) 125-146
Results of exploration drilling combined with results of geologic, geophysical, and hydrogeochemical investigations have been used to construct a geochemical model of the Platanares geothermal system, Honduras. Three coreholes were drilled, two of which produced fluids from fractured Miocene andesite and altered Cretaceous to Eocene conglomerate at 450 to 680...
