Conference Papers
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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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Lead isotopes and trace metals in dust at Yucca Mountain
Lead (Pb)-isotope compositions and trace-metal concentrations were determined for samples of dust collected from underground and surface locations at and near the proposed radioactive waste repository at Yucca Mountain, Nevada. Rare earth element concentrations in the dust samples from the underground tunnels are similar to those in wholerock samples of the repository host rocks (Miocene Tiva Cany
Authors
Loretta Kwak, Leonid A. Neymark, Zell E. Peterman
Subsurface fate and transport of sulfamethoxazole, 4-nonylphenol, and 17β-estradiol
Subsurface fate and transport of the antibiotic sulfamethoxazole (SX), the non-ionic surfactant degradation product 4-nonylphenol (NP), and the sex hormone 17β-estradiol (E2) were evaluated in a plume of contaminated groundwater at Cape Cod, Massachusetts, USA. The plume is the result of 60 years of wastewater treatment plant effluent disposal into rapid infiltration beds. Natural-gradient, in sit
Authors
L. B. Barber, M. T. Meyer, D.R. LeBlanc, Dana W. Kolpin, Paul Radley, F. Chapelle, F. Rubio
The effect of river regulations and ground-water discharge on the ecology of the riparian corridors of the Colorado River and tributaries
No abstract available.
Authors
Donald O. Rosenberry
Use of a groundwater flow model to assess the location, extent, and hydrologic properties of faults in the Rialto-Colton Basin, California
Faults within a groundwater basin can greatly influence the direction of groundwater flow and contaminant migration. Existing steady-state and transient groundwater flow models were used to assess the location, extent, and hydrologic properties of two alternative fault configurations within the Rialto-Colton basin. Adjustments were made to the hydrologic properties of the faults and the location o
Authors
Linda R. Woolfenden
A bird community on the edge: habitat use of forest songbirds In eastern Oklahoma
Several species of forest songbirds reach a western limit of their respective distributions in eastern Oklahoma. The relative infl uence of various habitat variables on patterns of occurrence in this region may differ from those same infl uences in the core of species’ ranges. We examined the infl uence of 16 habitat variables on the occurrence and density of a suite of forest songbirds. We sample
Authors
Vincent S. Cavalieri, Timothy J. O'Connell, David M. Leslie
A generic analysis of energy use and solvent selection for CO2 separation from post-combustion flue gases
A thermodynamic calculation was performed to determine the theoretical minimum energy used to separate CO2 from a coal combustion flue gas in a typical adsorption-desorption system. Under ideal conditions, the minimum energy required to separate CO2 from post-combustion flue gas and produce pure CO2 at 1 atmospheric pressure was only about 1183 kJ/kg CO2. This amount could double with the addition
Authors
Y. Lu, S. Chen, M. Rostam-Abadi
A geophysical investigation of shallow deformation along an anomalous section of the Wasatch fault zone, Utah, USA
We report the results of a geophysical study of the Wasatch fault zone near the Provo and Salt Lake City segment boundary. This area is anomalous because the fault zone strikes more east-west than north-south. Vibroseis was used to record a common mid-point (CMP) profile that provides information to depths of ???500 m. A tomographic velocity model, derived from first breaks, constrained source and
Authors
J.H. McBride, W. J. Stephenson, T.J. Thompson, M.P. Harper, A.A. Eipert, J.C. Hoopes, D.G. Tingey, R.W. Keach, A. O. Okojie-Ayoro, K.L. Gunderson, C.D. Meirovitz, T.C. Hicks, C.J. Spencer, J.R. Yaede, D. M. Worley
A lightweight sensor network management system design
In this paper, we propose a lightweight and transparent management framework for TinyOS sensor networks, called L-SNMS, which minimizes the overhead of management functions, including memory usage overhead, network traffic overhead, and integration overhead. We accomplish this by making L-SNMS virtually transparent to other applications hence requiring minimal integration. The proposed L-SNMS fram
Authors
F. Yuan, W.-Z. Song, N. Peterson, Y. Peng, L. Wang, B. Shirazi, R. LaHusen
A low intensity sampling method for assessing blue crab abundance at Aransas National Wildlife Refuge and preliminary results on the relationship of blue crab abundance to whooping crane winter mortality
We sampled blue crabs (Callinectes sapidus) in marshes on the Aransas National Wildlife Refuge, Texas from 1997 to 2005 to determine whether whooping crane (Grus americana) mortality was related to the availability of this food source. For four years, 1997 - 2001, we sampled monthly from the fall through the spring. From these data, we developed a reduced sampling effort method that adequately cha
Authors
Bruce H. Pugesek, Michael J. Baldwin, Thomas Stehn
A quantitative evaluation of the iron-sulfur world and its relevance to life's origins
The significance of Wa??chtersha??user's iron-sulfur world to the origin of life and the limits to its notional autocatalytic cycles are examined in kinetic simulations of the chain polymerization sequence primitive materials ??? amino acids ??? oligomers The simulations were run for the formation of all oligomers up to the 20-mer over a 1 Gy interval from the end of the period of heavy bombardmen
Authors
D.S. Ross
A soil burn severity index for understanding soil-fire relations in tropical forests
Methods for evaluating the impact of fires within tropical forests are needed as fires become more frequent and human populations and demands on forests increase. Short- and long-term fire effects on soils are determined by the prefire, fire, and postfire environments. We placed these components within a fire-disturbance continuum to guide our literature synthesis and develop an integrated soil bu
Authors
T.B. Jain, W.A. Gould, R.T. Graham, D. S. Pilliod, L.B. Lentile, G. Gonzalez