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.
Filter Total Items: 5321
Centralized mission planning and scheduling system for the Landsat Data Continuity Mission
Satellites in Low Earth Orbit provide missions with closer range for studying aspects such as geography and topography, but often require efficient utilization of space and ground assets. Optimizing schedules for these satellites amounts to a complex planning puzzle since it requires operators to face issues such as discontinuous ground contacts, limited onboard memory storage, constrained downlin
Authors
Alicia Kavelaars, Assaf M. Barnoy, Shawna Gregory, Gonzalo Garcia, Cesar Talon, Gregory Greer, Jason Williams, Vicki Dulski
Chromic and iron oxides as fecal markers to identify individual whooping cranes
The whooping crane (Grus americana) is listed as endangered under the IUCN Red List, the United States Endangered Species Act, and the Canadian Species at Risk Act (BirdLife International 2012, CWS and USFWS 2007). A major focus of recovery efforts for this endangered species is reintroduction to establish new populations (CWS and USFWS 2007). Captive populations are critical as a source of indivi
Authors
Megan E. Brown, Robert Doyle, Jane N. Chandler, Glenn H. Olsen, John B. French, David E Wildt, Sarah J. Converse, Carol L Keefer, Nucharin Songsasen
Development of dietary-based toxic reference values to assess the risk of chlorophacinone to non-target raptorial birds
Regulatory changes in the use of some second-generation anticoagulant rodenticides in parts of North America may result in expanded use of first-generation anticoagulant rodenticides (FGARs). Recent toxicological studies with captive raptors have demonstrated that these species are considerably more sensitive to the FGAR diphacinone than traditional avian wildlife test species (mallard, bobwhite).
Authors
Barnett A. Rattner, Rebecca S. Lazarus, S. L. Shultz, Katherine E. Horak, Benjamin G. Abbo, Steven F. Volker
Dietary nitrate and cardiovascular health
September 17, 2014, Bethesda, Maryland
The National Heart, Lung, and Blood Institute convened this workshop to discuss the results of recent research on the effects of inorganic nitrate and nitrite on the cardiovascular system, possible long term effects of these compounds in the diet and drinking water, and future research needs including population-wide effects examined through epidemiological s
Authors
A. Ahluwalia, M. T. Gladwin, Jane L. Harman, M.H. Ward, Bernard T. Nolan
Efficient 3D movement-based kernel density estimator and application to wildlife ecology
We describe an efficient implementation of a 3D movement-based kernel density estimator for determining animal space use from discrete GPS measurements. This new method provides more accurate results, particularly for species that make large excursions in the vertical dimension. The downside of this approach is that it is much more computationally expensive than simpler, lower-dimensional models.
Authors
Jeff Tracey-PR, James K. Sheppard, Glenn K. Lockwood, Amit Chourasia, Mahidhar Tatineni, Robert N. Fisher, Robert S. Sinkovits
Estimating structural collapse fragility of generic building typologies using expert judgment
The structured expert elicitation process proposed by Cooke (1991),
hereafter referred to as Cooke’s approach, is applied for the first time
in the realm of structural collapse-fragility assessment for selected generic
construction types. Cooke’s approach works on the principle of objective
calibration scoring of judgments coupled with hypothesis testing used in classical
statistics. The perf
Authors
Kishor S. Jaiswal, D. J. Wald, D. Perkins, W. P. Aspinall, Anne S. Kiremidjian
Geophysical investigations of the geologic and hydrothermal framework of the Pilgrim Springs Geothermal Area, Alaska
Pilgrim Hot Springs, located on the Seward Peninsula in west-central Alaska, is characterized by hot springs, surrounding thawed regions, and elevated lake temperatures. The area is of interest because of its potential for providing renewable energy for Nome and nearby rural communities. We performed ground and airborne geophysical investigations of the Pilgrim Springs geothermal area to identify
Authors
Jonathan M.G. Glen, Darcy McPhee, Paul A. Bedrosian
Integrating recent land cover mapping efforts to update the National Gap Analysis Program's species habitat map
Over the past decade, great progress has been made to develop national extent land cover mapping products to address natural resource issues. One of the core products of the GAP Program is range-wide species distribution models for nearly 2000 terrestrial vertebrate species in the U.S. We rely on deductive modeling of habitat affinities using these products to create models of habitat availability
Authors
Alexa McKerrow, A. Davidson, Todd Earnhardt, Abigail L. Benson
Meteorological variables associated with deep slab avalanches on persistent weak layers
Deep slab avalanches are a particularly challenging avalanche forecasting problem. These avalanches are typically difficult to trigger, yet when they are triggered they tend to propagate far and result in large and destructive avalanches. For this work we define deep slab avalanches as those that fail on persistent weak layers deeper than 0.9m (3 feet), and that occur after February 1st. We utiliz
Authors
Alex Marienthal, Jordy Hendrikx, Karl Birkeland, Kathryn M. Irvine
Modeling the hydrogeophysical response of lake talik evolution
Geophysical methods provide valuable information about subsurface permafrost and its relation to dynamic hydrologic systems. Airborne electromagnetic data from interior Alaska are used to map the distribution of permafrost, geological features, surface water, and groundwater. To validate and gain further insight into these field datasets, we also explore the geophysical response to hydrologic simu
Authors
Burke J. Minsley, Tristan Wellman, Michelle Ann Walvoord, Andre Revil
Observations from borehole dilution logging experiments in fractured crystalline rock under variable hydraulic conditions
Identifying hydraulically active fractures in low permeability, crystalline-bedrock aquifers requires a variety of geophysical and hydrogeophysical borehole tools and approaches. One such approach is Single Borehole Dilution Tests (SBDT), which in some low flow cases have been shown to provide greater resolution of borehole flow than other logging procedures, such as vertical differential Heat Pul
Authors
Philip T. Harte, J. Alton Anderson, John H. Williams
Physically based method for measuring suspended-sediment concentration and grain size using multi-frequency arrays of acoustic-doppler profilers
As the result of a 12-year program of sediment-transport research and field testing on the Colorado River (6 stations in UT and AZ), Yampa River (2 stations in CO), Little Snake River (1 station in CO), Green River (1 station in CO and 2 stations in UT), and Rio Grande (2 stations in TX), we have developed a physically based method for measuring suspended-sediment concentration and grain size at 1
Authors
David J. Topping, Scott A. Wright, Ronald E. Griffiths, David Dean