Skip to main content
U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Results

68909 results.

Alternate formats: RIS file of the first 3000 search results  |  Download all results as CSV | TSV | Excel  |  RSS feed based on this search  |  JSON version of this page of results

Page 2143, results 53551 - 53575

Show results on a map

Publication Extents

Not all publications have extents, not all extents are completely accurate
Freshwater aspects of anadromous salmonid enhancement
Rowan W. Gould
1982, NOAA Technical Report NMFS Circular 447
Freshwater enhancement of anadromous salmonid populations has been practiced in the United States and Canada since the late 1800's. Reduction of natural spawning habitat and increasing fishing pressure make artificial enhancement a possible alternative to declining populations. Enhancement of anadromous salmonids involved improvement of the natural environment and reducing natural mortality....
Results of a modeling workshop concerning economic and environmental trends and concomitant resource management issues in the Mobile Bay area
David B. Hamilton, Austin K. Andrews, Gregor T. Auble, Richard A. Ellison, Richard A. Johnson, James E. Roelle, Michael J. Staley
1982, Report
During the past decade, the southern regions of the U.S. have experienced rapid change which is expected to continue into the foreseeable future. Growth in population, industry, and resource development has been attributed to a variety of advantages such as an abundant and inexpensive labor force, a mild climate,...
HEP as a planning tool: an application to waterfowl enhancement
Scott C. Matulich, Jeffrey E. Hanson, Ivan Lines, Adrian Farmer
1982, Transactions of the North American Wildlife and Natural Resources Conference (47)
To many, the principal role of wildlife agencies in public and private resource development has been that of impact mitigation. With known or pending habitat damage, biologists have to develop mitigation or compensation plans. Unfortunately, once in a mitigation framework, they are in a no-win situation, seeking remedial action at...
Siderite concretions: indicators of early diagenesis in the Gammon shale (Cretaceous).
D. L. Gautier
1982, Journal of Sedimentary Petrology (52) 859-871
The Gammon member of the Pierre shale of the northern Great Plains, USA, contains abundant siderite concretions. The relative depth and time of siderite precipitation can be inferred from the structure, mineralogy and isotopic composition of these concretions. Concretions that formed at shallow depths, early in the history of the...
Leachability of uranium and other elements from freshly erupted volcanic ash
D. B. Smith, R. A. Zielinski, W.I. Rose Jr.
1982, Journal of Volcanology and Geothermal Research (13) 1-30
A study of leaching of freshly erupted basaltic and dacitic air-fall ash and bomb fragment samples, unaffected by rain, shows that glass dissolution is the dominant process by which uranium is initially mobilized from air-fall volcanic ash. Si, Li, and V are also preferentially mobilized by glass dissolution. Gaseous transfer...
Implications of the Precambrian lineaments on the Red Sea tectonics based on Landsat study of northeast Sudan
F. Ahmed
1982, Global Tectonics and Metallogeny (1) 326-335
Lineament analysis of a Landsat Imagery mosaic (scale 1:1,000,000) of northeast Sugdan indicate significant curvilinear as well as rectilinear fracture patterns of possible Precambrian age.  Rectilinear features trend dominantly in N-S (± 10°), NNW and ENE, and less commonly in NW and EW directions.  The Precambrian fractures closely match, and...
Distribution, mineralogy, and texture of manganese nodules and their relation to sedimentation at DOMES Site A in the equatorial North Pacific
David Z. Piper, J. R. Blueford
1982, Deep Sea Research Part A, Oceanographic Research Papers (29) 927-951
DOMES Site A, in the equatorial North Pacific, was surveyed in detail in an attempt to relate the distribution of nodules to sedimentation. The sea floor is characterized by a broad east-west-trending valley defined by strongly dissected highlands to the north and...
Chemical-quality reconnaissance of the water and surficial bed material in the Delaware River estuary and adjacent New Jersey tributaries, 1980-81
Joseph J. Hochreiter Jr.
1982, Water-Resources Investigations Report 82-36
This report presents chemical-quality data collected from May 1980 to January 1981 at several locations within the Delaware River estuary and selected New Jersey tributaries. Samples of surface water were analyzed Environmental Protection Agency ' priority pollutants, ' including acid extractable, base/neutral extractable and volatile organic compounds, in addition to...
Ground-water temperature of the with application to ground-water-source heat pumps
Arthur L. Hodges Jr.
1982, Water-Resources Investigations Report 82-53
Ground-water temperature was measured during a one-year period (1980-81) in 20 wells in the Wyoming Quadrangle in central Delaware. Data from thermistors set at fixed depths in two wells were collected twice each week, and vertical temperature profiles of the remaining 18 wells were made monthly. Ground-water temperature at 8...
A new instrument for sampling flocculent material at the water/sediment interface
Michael H. Bothner, Page C. Valentine
1982, Journal of Sedimentary Research (52) 639-640
We have designed an instrument to collect fine-grained and flocculent material from the water/sediment interface for chemical and mineralogical analysis. The sampler can be used from a manned research submersible or by a diver in shallow water. In areas of active deposition, the material collected represents the most recently deposited...
Origin of biotite-hornblende-garnet coronas between oxides and plagioclase in olivine metagabbros, Adirondack region, New York
P.R. Whitney, J. M. McLelland
1982, Contributions to Mineralogy and Petrology (82) 34-41
Complex multivariant reactions involving Fe-Ti oxide minerals, plagioclase and olivine have produced coronas of biotite, hornblende and garnet between ilmenite and plagioclase in Adirondack olivine metagabbros. Both the biotite (6-10% TiO2) and the hornblende (3-6% TiO2) are exceptionally Titanium-rich. The garnet is nearly identical in composition to the garnet in...
An analysis of input errors in precipitation-runoff models using regression with errors in the independent variables
Brent M. Troutman
1982, Water Resources Research (18) 947-964
Errors in runoff prediction caused by input data errors are analyzed by treating precipitation-runoff models as regression (conditional expectation) models. Independent variables of the regression consist of precipitation and other input measurements; the dependent variable is runoff. In models using erroneous input data, prediction errors are inflated and estimates of...
Mineralogy and stable isotope geochemistry of hydrothermally altered oceanic rocks
D.S. Stakes, J. R. O’Neil
1982, Earth and Planetary Science Letters (57) 285-304
Mineralogical and isotopic variations observed in altered glassy and crystalline rocksfrom the East Pacific Rise and the Mid-Atlantic Ridge provide information about the temperatures of alteration and seawater/rock ratios for various hydrothermal regimes within the oceanic crust. A systematic increase in alteration temperature is evident for the glassy rocksin the...
Accumulation rates of Th-230, Pa-231, and some transition metals on the Bermuda Rise
M.P. Bacon, J.N. Rosholt
1982, Geochimica et Cosmochimica Acta (46) 651-666
Measurements of 238U, 234U, 230Th, 232Th, 231Pa, Mn, Fe, Co, Ni, Cu, and Zn were made on 23 samples from core GPC-5, a 29-m giant piston core from a water depth of 4583 m on the northeastern Bermuda Rise (33°41.2′N, 57°36.9′W). This area is characterized by rapid deposition of sediment transported by abyssal currents. Unsupported 230Th...
Laboratory measurements of reservoir rock from the Geysers geothermal field, California
D.A. Lockner, R. Summers, D. Moore, J.D. Byerlee
1982, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts (19) 65-80
Rock samples taken from two outcrops, as well as rare cores from three well bores at the Geysers geothermal field, California, were tested at temperatures and pressures similar to those found in the geothermal field. Both intact and 30?? sawcut cylinders were deformed at confining pressures of 200-1000 bars, pore...
Variation in sand body types on the eastern Bering Sea epicontinental shelf.
C.H. Nelson, W.R. Dupre, M.E. Field, J.D. Howard
1982, Geologie en Mijnbouw (61) 37-48
The eastern epicontinental shelf of the Bering Sea is characterized by variations in river and glacial sediment supply, wave energy, tidal range (microtidal to mesotidal), and tidal, geostrophic, and storm-induced currents. These factors, combined with the effect of the Holocene rise in sea level, have resulted in the formation of...
Water-soluble material on aerosols collected within volcanic eruption clouds
D. B. Smith, R. A. Zielinski, W.I. Rose Jr., B.J. Huebert
1982, Journal of Geophysical Research - Oceans (87) 4963-4972
In February and March of 1978, filter samplers mounted on an aircraft were used to collect the aerosol fraction of the eruption clouds from three active Guatemalan volcanoes (Fuego, Pacaya, and Santiaguito). The samples were collected on Teflon (Fluoropore) filters with a nominal pore diameter of 0.5μm. The mass of...