Portable precision dc voltage-current transfer standard for electrometer calibration
G. Landis, M. Godwin
1982, Review of Scientific Instruments (53) 1290-1291
A circuit design is presented for an instrument providing a highly stable and fully adjustable voltage and current in the range of 0-1.999 V or 0-199.9 mV and 10-11-10-15 A. This instrument is used to verify the calibration and performance of dc and vibrating reed electrometers and chart recorders on...
Post-depositional alteration of titanomagnetite in a Miocene sandstone, south Texas (U.S.A.)
R. L. Reynolds
1982, Earth and Planetary Science Letters (61) 381-391
Petrographic and geochemical studies have yielded information on the time-space relationships of the post-depositional alteration of detrital titanomagnetite (Ti-mt) in fine- to medium-grained sandstone from unoriented core samples (taken below the water table at depths of 30–45 m) of the Miocene...
Notes. Characterization of plutonium in ground water near the idaho chemical processing plant
Jess M. Cleveland, Terry F. Rees
1982, Environmental Science and Technology (16) 437-439
Plutonium is present in very low concentrations in ground water near the disposal well at the Idaho Chemical Processing Plant but was not detected in waters at greater distances. Because of the absence of strong complexing agents, the plutonium is present as an uncomplexed (perhaps hydrolyzed) tetravalent species, which is...
A comparison of four streamflow record extension techniques
Robert M. Hirsch
1982, Water Resources Research (18) 1081-1088
One approach to developing time series of streamflow, which may be used for simulation and optimization studies of water resources development activities, is to extend an existing gage record in time by exploiting the interstation correlation between the station of interest and some nearby (long-term) base station. Four methods of...
Aminostratigraphy and faunal correlations of late Quaternary marine terraces, Pacific Coast, USA
G. L. Kennedy, K. R. Lajoie, J.F. Wehmiller
1982, Nature (299) 545-547
Recent studies using the extent of racemization of amino acids to date fossil mollusc shells in the Arctic1, the British Isles2 and on the Atlantic3,4 and Pacific5-13 coasts of North America have relied mainly on theoretical kinetic models of racemization. Ages generated in this fashion are highly model dependent and...
Geochemistry of a Pliocene-Pleistocene oceanic-arc plutonic complex, Guadalcanal
A.R. Chivas, A.S. Andrew, A.K. Sinha, J. R. O’Neil
1982, Nature (300) 139-143
The Koloula Igneous Complex, on the island of Guadalcanal, consists of a low-K calc-alkaline sequence of 26 different intrusive phases. The major intrusions are characterized by K/Rb>400, Rb/Sr<0.06, ?? 18O of 5.7 to 7.2 and uniform 87Sr/86Sr of 0.70372. This article presents the first data describing oxygen and strontium isotopic...
Ice rafting of fine-grained sediment, a sorting and transport mechanism, Beaufort Sea, Alaska
P. W. Barnes, E. Reimnitz, D. Fox
1982, Journal of Sedimentary Petrology (52) 493-502
The presence of turbid, sediment-rich fast ice in the Arctic is a major factor affecting transport of fine-grained sediment. Turbid ice was found to be present in a zone 10 to 20 km wide along the coast of the Beaufort Sea. Sediment concentrations...
Sediment deposition in a flood retention structure after two record floods in southwestern Wisconsin.
P.A. Kammerer Jr., W. G. Batten
1982, Journal of Soil and Water Conservation (37) 302-304
Sediment deposited in a flood-control structure was measured after record floods in SW Wisconsin on June 17 and June 30-July 1, 1978. The structure is in the Driftless Area, where high relief, erodible soils, and land use contribute to high soil losses. The two floods deposited 4.1 acre-ft of sediment...
Leaching of radionuclides from uranium ore and mill tailings ( Ra- 226, Tn-230).
E. R. Landa
1982, Uranium (1) 53-63
The major part of the extractable uranium is associated with a readily acid-soluble fraction in both ore and tailings. The major part of the extractable 226Ra was associated with an iron, manganese hydrous-oxide fraction in the ore and tailings. Thorium-230 was the least leachable of the radionuclides studied. The major...
Introduction: seismology and earthquake engineering in Mexico and Central and South America.
A. F. Espinosa
1982, Earthquake Information Bulletin (USGS) (14) 4-6
The results from seismological studies that are used by the engineering community are just one of the benefits obtained from research aimed at mitigating the earthquake hazard. In this issue of Earthquake Information Bulletin current programs in seismology and earthquake engineering, seismic networks, future plans and some of the cooperative...
Bank stability and channel width adjustment, East Fork River, Wyoming
E.D. Andrews
1982, Water Resources Research (18) 1184-1192
Frequent surveys of eight cross sections located in self-formed reaches of the East Fork River, Wyoming, during the 1974 snowmelt flood showed a close relation between channel morphology and scour and fill. Those cross sections narrower than the mean reach width filled at discharges less than bankfull and scoured at...
Determination of lithium isotopes at natural abundance levels by atomic absorption spectrometry
A. L. Meier
1982, Analytical Chemistry (54) 2158-2161
The relationships of the absorption of 6Li and 7Li hollow cathode lamp emissions are used to determine lithium isotopic composition in the natural abundance range of geologic materials. Absorption was found to have a nonlinear dependence upon total lithium concentration and isotopic composition. A method using nonlinear equations to describe...
Cretaceous biostratigraphy in the Wyoming thrust belt.
D. J. Nichols, S.R. Jacobson
1982, Mountain Geologist (19) 73-78
In the Cretaceous section of the thrust belt, fossils are especially useful for dating and correlating repetitive facies of different ages in structurally complex terrain. The biostratigraphic zonation for the region is based on megafossils (chiefly ammonites) , which permit accurate dating and correlation of outcrop sections, and which have...
Space platform albedo measurements as indicators of change in arid lands
C.J. Robinove
1982, Advances in Space Research (2) 31-35
The change in albedo of arid lands is an indicator of changes in their condition and quality, including density of vegetative cover, erosion, deposition, surficial soil moisture, and man-made change. In general, darkening of an arid land surface indicates an increase in land quality while brightening indicates a decrease in...
An improved method for the determination of trace levels of arsenic and antimony in geological materials by automated hydride generation–Atomic absorption spectroscopy
J.G. Crock, F.E. Lichte
1982, Analytica Chimica Acta (144) 223-233
An improved, automated method for the determination of arsenic and antimony in geological materials is described. After digestion of the material in sulfuric, nitric, hydrofluoric and perchloric acids, a hydrochloric acid solution of the sample is automatically mixed with reducing agents, acidified with additional hydrochloric acid, and treated with a...
Landsat monitoring of desert vegetation growth, 1972-1979 using a plant-shadowing model
Joseph Otterman, C.J. Robinove
1982, Advances in Space Research (2) 45-50
Landsat digital data spanning the period 1972-1979 were analyzed to monitor the status of vegetation within and outside an exclosure in the northern Sinai (precipitation 100-150 mm/year). This 6??6 km exclosure was fenced off in the summer of 1974 and subsequently has been free from the anthropogenic pressures (overgrazing, cultivation...
A model for managing sources of groundwater pollution
Steven M. Gorelick
1982, Water Resources Research (18) 773-781
The waste disposal capacity of a groundwater system can be maximized while maintaining water quality at specified locations by using a groundwater pollutant source management model that is based upon linear programing and numerical simulation. The decision variables of the management model are solute waste disposal rates at various facilities...
Gravity evidence for a shallow intrusion under Medicine Lake volcano, California
Carol A. Finn, D.L. Williams
1982, Geology (10) 503-507
A positive gravity anomaly is associated with Medicine Lake volcano, California. Trials with different Bouguer reduction densities indicate that this positive anomaly cannot be explained by an inappropriate choice of Bouguer reduction density but must be caused by a subvolcanic body. After separating...
Applications of Landsat imagery to problems of petroleum exploration in Qaidam Basin, China
G. B. Bailey, P. D. Anderson
1982, American Association of Petroleum Geologists Bulletin (66) 1348-1354
Tertiary and Quaternary nonmarine, petroleum-bearing sedimentary rocks in the Qaidam basin of remote western China have been extensively deformed by compressive forces. These forces created many folds which are current targets of Chinese exploration programs. Manual techniques of image analysis and interpretation were applied to computer-enhanced Landsat images of the...
Simulations of seabird damage and recovery from oilspills in the northern Gulf of Alaska.
W.B. Samuels, K.J. Lanfear
1982, Journal of Environmental Management (15) 169-182
If an oilspill contacts a colony of glaucous-winged gulls Larus hyperboreus, reducing the population by 50%, the population is expected to recover to its pre-spill level in c.20 yr. For common murres Uria aalge, this same situation yields a recovery time of c.70 yr. Assuming that oil is found in...
The modified polyconic projection for the IMW
John P. Snyder
1982, Cartographica: The International Journal for Geographic Information and Geovisualization (19) 31-43
The modified Polyconic map projection designed by Lallemand and adopted for the International Map of the World between 1909 and 1962 has two meridians and two parallels which are true to scale. Constructed geometrically in the past, forward and inverse coordinate transformations may be calculated analytically in order to transfer...
Computation with physical values from Landsat digital data
C.J. Robinove
1982, Photogrammetric Engineering and Remote Sensing (48) 781-784
Landsat digital images are commonly analyzed by using the digital numbers for each pixel recorded on a computer-compatible magnetic tape. Although this procedure may be satisfactory when only a single, internally consistent image is used, the procedure may produce incorrect results if more than one image is used for analysis...
Oxygen isotope geothermometry and stability of lawsonite and pumpellyite in the Shuksan Suite, North Cascades, Washington
E. H. Brown, J. R. O’Neil
1982, Contributions to Mineralogy and Petrology (80) 240-244
Metamorphic temperatures of 330??-400?? C are inferred for rocks from the Shuksan blueschist terrane in the North Cascades, Washington. The temperatures are calculated from 18O fractionations between coexisting quartz and magnetite using the equations of Bottinga and Javoy (1973). Pressures of approximately 7 kilobars are indicated by the Jadeite content...
Nutrient exchange across the sediment-water interface in the Potomac River estuary
E. Callender, Douglas E. Hammond
1982, Estuarine, Coastal and Shelf Science (15) 395-413
The flux of ammonia, phosphate, silica and radon-222 from Potomac tidal river and estuary sediments is controlled by processes occurring at the sediment-water interface and within surficial sediment. Calculated diffusive fluxes range between 0·6 and 6·5 mmol m−2 day−1 for ammonia, 0·020 and 0·30 mmol m−2 day−1 for phosphate, and 1·3 and 3·8 mmol...
Determination of polar organic solutes in oil-shale retort water
J.A. Leenheer, T.I. Noyes, H. A. Stuber
1982, Environmental Science & Technology (16) 714-723
No abstract available....
