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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Use of microstrip patch antennas in grain and pulverized materials permittivity measurement
A free-space microwave system developed for the measurement of the relative complex permittivity of granular materials and of pulverized materials was reported. The system consists of a transmitting antenna and a receiving antenna separated by a space filled by the sample to be characterized and a network analyzer for transmission measurement. The receiving antenna was mounted on a movable plate,
Authors
M.A. El Sabbagh, O.M. Ramahi, S. Trabelsi, S.O. Nelson, L. Khan
Use of microstrip patch antennas in grain permittivity measurement
In this paper, a compact size free-space setup is proposed for the measurement of complex permittivity of granular materials. The horn antennas in the conventional setup are replaced by microstrip patch antennas which is a step toward system miniaturization. The experimental results obtained are in good agreement with those obtained with horn antennas.
Authors
M.A. El Sabbagh, O.M. Ramahi, S. Trabelsi, S.O. Nelson, L. Khan
Use of the Legal-Institutional Analysis Model to assess hydropower licensing negotiations
In the United States, the Federal Energy Regulatory Commission (FERC) is responsible for issuing or renewing licenses for hydropower projects owned and operated by power companies. During the licensing process, these companies are required to consult with agencies and other parties that are affected by project operating regimes. Typical participants include state and federal fish and wildlife ag
Authors
N. Burkardt, B. L. Lamb
USGS Alaska Tissue Archival Projects: An update on FY02 activities
The banking of environmental specimens under cryogenic conditions for future retrospective analysis has been recognized for many years as an important part of environmental monitoring programs. Since 1987, the Alaska Marine Mammal Tissue Archival Project (AMMTAP) has been collecting tissue samples from marine mammals for archival in the National Biomonitoring Specimen Bank (NBSB) at the National I
Authors
Geoff Weston-York
USGS overview of research activities for evaluating uncertainty
No abstract available.
Authors
Mary C. Hill, George H. Leavesley
Using a 1200 kHz workhorse ADCP with mode 12 to measure near bottom mean currents
Using high frequency Acoustic Doppler Current (ADCP) profiling technology, it is possible to make high-resolution measurements of mean current profiles within a few meters of the seabed. In coastal applications, mean current speeds may be 10 cm/s or less, and oscillatory wave currents may exceed 100 cm/s during storm events. To resolve mean flows of 10 cm/s or less under these conditions, accuraci
Authors
M. Martini
Using noble gases to investigate mountain-front recharge
Mountain-front recharge is a major component of recharge to inter-mountain basin-fill aquifers. The two components of mountain-front recharge are (1) subsurface inflow from the mountain block (subsurface inflow), and (2) infiltration from perennial and ephemeral streams near the mountain front (stream seepage). The magnitude of subsurface inflow is of central importance in source protection planni
Authors
A. H. Manning, D. K. Solomon
Using strip-transect aerial surveys to estimate manatee abundance and population trend in the Ten Thousand Islands Region of southwest Florida
No abstract available.
Authors
Dean E. Easton, Lynn W. Lefebvre, T.J. Doyle
Volcanic debris flows in developing countries - The extreme need for public education and awareness of debris-flow hazards
In many developing countries, volcanic debris flows pose a significant societal risk owing to the distribution of dense populations that commonly live on or near a volcano. At many volcanoes, modest volume (up to 500,000 m 3) debris flows are relatively common (multiple times per century) and typically flow at least 5 km along established drainages. Owing to typical debris-flow velocities there is
Authors
J. J. Major, S. P. Schilling, C.R. Pullinger
Web-based data delivery services in support of disaster-relief applications
The U.S. Geological Survey Earth Resources Observation Systems Data Center responds to emergencies in support of various government agencies for human-induced and natural disasters. This response consists of satellite tasking and acquisitions, satellite image registrations, disaster-extent maps analysis and creation, base image provision and support, Web-based mapping services for product delivery
Authors
Brenda K. Jones, Ron R. Risty, M. Buswell
Wildfire-related debris-flow generation through episodic progressive sediment-bulking processes, western USA
Debris-flow initiation processes on hillslopes recently burned by wildfire differ from those generally recognized on unburned, vegetated hillslopes. These differences result from fire-induced changes in the hydrologic response to rainfall events. In this study, detailed field and aerial photographic mapping, observations, and measurements of debris-flow events from three sites in the western U.S.
Authors
S.H. Cannon, J.E. Gartner, C. Parrett, M. Parise
Detection and mapping of fractures and cavities using borehole radar
Borehole radar can be used in a single-hole reflection mode or in a cross-hole tomography mode. In the reflection mode, radar provides an image of discontinuities in the bedrock surrounding a borehole, including bedding planes, lithologic contacts, fractures, and cavities. The measurements are either directional or omni-directional, depending upon the type of equipment and antennas. In the tomogra
Authors
F. P. Haeni, Lucien Halleux, Carole D. Johnson, John W. Lane