Geochemistry of rare earth elements in Permian coals from the Huaibei Coalfield, China
Lingyun Zheng, Gaisheng Liu, C. L. Chou, C. Qi, Y. Zhang
2007, Journal of Asian Earth Sciences (31) 167-176
The rare earth elements (REEs) in coals are important because of: (a) REE patterns can be an indicator of the nature of source rocks of the mineral matter as well as sedimentary environments; (b) REEs abundance in coal may have industrial-significance. In this study, a total of thirty-four samples of...
Escape tectonics and the extrusion of Alaska: Past, present, and future
T.F. Redfield, D.W. Scholl, P.G. Fitzgerald, M. E. Beck Jr.
2007, Geology (35) 1039-1042
The North Pacific Rim is a tectonically active plate boundary zone parts of which may be characterized as a laterally moving orogenic stream. Crustal blocks are transported along large-magnitude strike-slip faults in western Canada and central Alaska toward the Aleutian-Bering Sea subduction zones. Throughout much of the Cenozoic, at and...
Migratory movements of pacu, Piaractus mesopotamicus, in the highly impounded Paraná River
M.C. Makrakis, L.E. Miranda, S. Makrakis, A.M.M. Xavier, H.M. Fontes, W.G. Morlis
2007, Journal of Applied Ichthyology (23) 700-704
A mark-recapture study was conducted in 1997–2005 to investigate movements of stocked pacu, Piaractus mesopotamicus, in the Paraná River Basin of Brazil, Paraguay, and Argentina. Fish raised in cages within the Itaipu Reservoir and in ponds were tagged externally (n = 2976) and released in the Itaipu Reservoir (53.2%) and bays of its...
Tissue contaminants and associated transcriptional response in trout liver from high elevation lakes of Washington
P.W. Moran, N. Aluru, R. W. Black, M.M. Vijayan
2007, Environmental Science & Technology (41) 6591-6597
The consistent cold temperatures and large amount of precipitation in the Olympic and Cascade ranges of Washington State are thought to enhance atmospheric deposition of contaminants. However, little is known about contaminant levels in organisms residing in these remote high elevation lakes. We measured total mercury and 28 organochlorine compounds...
Evaluation of mean velocity and turbulence measurements with ADCPs
E.A. Nystrom, C.R. Rehmann, K. A. Oberg
2007, Journal of Hydraulic Engineering (133) 1310-1318
To test the ability of acoustic Doppler current profilers (ADCPs) to measure turbulence, profiles measured with two pulse-to-pulse coherent ADCPs in a laboratory flume were compared to profiles measured with an acoustic Doppler velocimeter, and time series measured in the acoustic beam of the ADCPs were examined. A four-beam ADCP...
River enhancement in the Upper Mississippi River basin: Approaches based on river uses, alterations, and management agencies
T. K. O’Donnell, D.L. Galat
2007, Restoration Ecology (15) 538-549
The Upper Mississippi River is characterized by a series of locks and dams, shallow impoundments, and thousands of river channelization structures that facilitate commercial navigation between Minneapolis, Minnesota, and Cairo, Illinois. Agriculture and urban development over the past 200 years have degraded water quality and increased the rate of sediment...
WSR-88D observations of volcanic ash
J. Wood, C. Scott, D. Schneider
2007, Conference Paper, 87th AMS Annual Meeting
Conclusions that may impact operations are summarized below: ??? Current VCPs may not be optimal for the scharacterization of volcanic events. Therefore, the development of a new VCP that combines the enhanced low level elevation density and increased temporal resolution of VCP 12 with the enhanced sensitivity of VCP 31....
Nesting habitat relationships of sympatric Crested Caracaras, Red-tailed Hawks, and White-tailed Hawks in South Texas
M.A. Actkinson, W.P. Kuvlesky Jr., C. W. Boal, L.A. Brennan, F. Hernandez
2007, Wilson Journal of Ornithology (119) 570-578
We quantified nesting-site habitats for sympatric White-tailed Hawks (Buteo albicaudatus) (n = 40), Red-tailed Hawks (B. jamaicensis) (n = 39), and Crested Caracaras (Caracara cheriway) (n = 24) in the Coastal Sand Plain of south Texas. White-tailed Hawks and Crested Caracara nest sites occurred in savannas, whereas Red-tailed Hawk nest...
Simulation and observations of annual density banding in skeletons of Montastraea (Cnidaria: Scleractinia) growing under thermal stress associated with ocean warming
F.P. Worum, J. P. Carricart-Ganivet, L. Benson, D. Golicher
2007, Limnology and Oceanography (52) 2317-2323
We present a model of annual density banding in skeletons of Montastraea coral species growing under thermal stress associated with an ocean-warming scenario. The model predicts that at sea-surface temperatures (SSTs) <29??C, high-density bands (HDBs) are formed during the warmest months of the year. As temperature rises and oscillates around...
Chemistry of water collected from an unventilated drift, Yucca Mountain, Nevada
B.D. Marshall, T.A. Oliver, Z. E. Peterman
2007, Conference Paper, Materials Research Society Symposium Proceedings
Water samples (referred to as puddle water samples) were collected from the surfaces of a conveyor belt and plastic sheeting in the unventilated portion of the Enhanced Characterization of the Repository Block (ECRB) Cross Drift in 2003 and 2005 at Yucca Mountain, Nevada. The chemistry of these puddle water samples...
Physical limits on ground motion at Yucca Mountain
D.J. Andrews, Thomas C. Hanks, J.W. Whitney
2007, Bulletin of the Seismological Society of America (97) 1771-1792
Physical limits on possible maximum ground motion at Yucca Mountain, Nevada, the designated site of a high-level radioactive waste repository, are set by the shear stress available in the seismogenic depth of the crust and by limits on stress change that can propagate through the medium. We find in dynamic...
Seismic hazard and risk assessment in the intraplate environment: The New Madrid seismic zone of the central United States
Z. Wang
2007, Special Paper of the Geological Society of America 363-374
Although the causes of large intraplate earthquakes are still not fully understood, they pose certain hazard and risk to societies. Estimating hazard and risk in these regions is difficult because of lack of earthquake records. The New Madrid seismic zone is one such region where large and rare intraplate earthquakes...
Investigation of the groundwater system at Masaya Caldera, Nicaragua, using transient electromagnetics and numerical simulation
R.E. MacNeil, W. E. Sanford, C.B. Connor, S.K. Sandberg, M. Diez
2007, Journal of Volcanology and Geothermal Research (166) 217-232
The distribution of groundwater beneath Masaya Volcano, in Nicaragua, and its surrounding caldera was characterized using the transient electromagnetic method (TEM). Multiple soundings were conducted at 30 sites. Models of the TEM data consistently indicate a resistive layer that is underlain by one or more conductive layers. These two layers...
Incidence of the fungus Batrachochytrium dendrobatidis in amphibian populations along the northwest coast of North America
M.J. Adams, S. Galvan, D. Reinitz, Rebecca A. Cole, Sanjay Pyare, M. Hahr, P. Govindarajulu
2007, Herpetological Review (38) 430-431
No abstract available....
Barrier island vulnerability to breaching: a case study on Dauphin Island, Alabama
Mark Hansen, Asbury H. Sallenger Jr.
2007, Conference Paper, Coastal Sediments '07 - Proceedings of 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes
Breaching of barrier islands can adversely impact society by severing infrastructure, destroying private properties, and altering water quality in back bays and estuaries. This study provides a scheme that assesses the relative vulnerability of a barrier island to breach during storms. Dauphin Island, Alabama was selected for this study because...
Large-scale scour of the sea floor and the effect of natural armouring processes, land reclamation Maasvlakte 2, port of Rotterdam
S. Boer, E. Elias, S. Aarninkhof, D. Roelvink, T. Vellinga
2007, Conference Paper, Coastal Sediments '07 - Proceedings of 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes
Morphological model computations based on uniform (non-graded) sediment revealed an unrealistically strong scour of the sea floor in the immediate vicinity to the west of Maasvlakte 2. By means of a state-of-the-art graded sediment transport model the effect of natural armouring and sorting of bed material on the scour process...
Predicting the next storm surge flood
B. Stamey, Hongfang Wang, M. Koterba
2007, Sea Technology (48) 10-15
The Virginia Institute of Marine Science (VIMS), National Weather Services (NWS) Sterling and Wakefield, Weather Forecast Offices (WFO), and the Chesapeake Bay Observing System (CBOS) jointly developed a prototype system of a regional capability to address national problem. The system was developed to integrate high-resolution atmospheric and hydrodynamic and storm...
Integrating observation and statistical forecasts over sub-Saharan Africa to support Famine Early Warning
Chris Funk, James P. Verdin, Gregory Husak
2007, Conference Paper, 87th American Meteorological Society annual meeting
Famine early warning in Africa presents unique challenges and rewards. Hydrologic extremes must be tracked and anticipated over complex and changing climate regimes. The successful anticipation and interpretation of hydrologic shocks can initiate effective government response, saving lives and softening the impacts of droughts and floods. While both monitoring and...
Improving GPR image resolution in lossy ground using dispersive migration
C.P. Oden, M.H. Powers, D.L. Wright, G.R. Olhoeft
2007, Conference Paper, IEEE Transactions on Geoscience and Remote Sensing
As a compact wave packet travels through a dispersive medium, it becomes dilated and distorted. As a result, ground-penetrating radar (GPR) surveys over conductive and/or lossy soils often result in poor image resolution. A dispersive migration method is presented that combines an inverse dispersion filter with frequency-domain migration. The method...
Diurnal variability in riverine dissolved organic matter composition determined by in situ optical measurement in the San Joaquin River (California, USA)
R.G.M. Spencer, B.A. Pellerin, B.A. Bergamaschi, B.D. Downing, T.E.C. Kraus, D.R. Smart, R.A. Dahlgren, P.J. Hernes
2007, Hydrological Processes (21) 3181-3189
Dissolved organic matter (DOM) concentration and composition in riverine and stream systems are known to vary with hydrological and productivity cycles over the annual and interannual time scales. Rivers are commonly perceived as homogeneous with respect to DOM concentration and composition, particularly under steady flow conditions over short time periods....
Bald Mountain gold mining district, Nevada: A Jurassic reduced intrusion-related gold system
C.J. Nutt, A. H. Hofstra
2007, Economic Geology (102) 1129-1155
The Bald Mountain mining district has produced about 2 million ounces (Moz) of An. Geologic mapping, field relationships, geochemical data, petrographic observations, fluid inclusion characteristics, and Pb, S, O, and H isotope data indicate that An mineralization was associated with a reduced Jurassic intrusion. Gold deposits are localized within and...
Potential hazards of environmental contaminants to avifauna residing in the Chesapeake Bay estuary
Barnett A. Rattner, Peter C. McGowan
2007, Waterbirds (30) 63-81
A search of the Contaminant Exposure and Effects-Terrestrial Vertebrates (CEE-TV) database revealed that 70% of the 839 Chesapeake Bay records deal with avian species. Studies conducted on waterbirds in the past 15 years indicate that organochlorine contaminants have declined in eggs and tissues, although p,p'-DDE, total polychlorinated biphenyls (PCBs) and...
Competitive release and facilitation of drug-resistant parasites after therapeutic chemotherapy in a rodent malaria model
A. R. Wargo, S. Huijben, J. C. De Roode, J. Shepherd, A.F. Read
2007, Proceedings of the National Academy of Sciences of the United States of America (104) 19914-19919
Malaria infections frequently consist of mixtures of drug-resistant and drug-sensitive parasites. If crowding occurs, where clonal population densities are suppressed by the presence of coinfecting clones, removal of susceptible clones by drug treatment could allow resistant clones to expand into the newly vacated niche space within a host. Theoretical models...
Use of behavioral and physiological indicators to evaluate Scaphirhynchus sturgeon spawning success
A. J. DeLonay, D. M. Papoulias, M. L. Wildhaber, M.L. Annis, J.L. Bryan, S.A. Griffith, S. H. Holan, D. E. Tillitt
2007, Journal of Applied Ichthyology (23) 428-435
Thirty gravid, female shovelnose sturgeon (Scaphirhynchus platorynchus) were captured in the Lower Missouri River in March 2004 to evaluate the effectiveness of physiology, telemetry and remote sensor technology coupled with change point analysis in identifying when and where Scaphirhynchus sturgeon spawn. Captured sturgeons were instrumented with ultrasonic transmitters and with...
Variation in northern bobwhite demography along two temporal scales
T.H. Folk, Randall R. Holmes, J. Barry Grand
2007, Population Ecology (49) 211-219
Quantification and understanding of demographic variation across intra- and inter-annual temporal scales can benefit from the development of theoretical models of evolution and applied conservation of species. We used long-term survey data for northern bobwhites (Colinus virginianus) collected at the northern and southern extent of its geographic range to develop...
