An empirical study of statistical properties of variance partition coefficients for multi-level logistic regression models
Ji Li, B. R. Gray, D.M. Bates
2008, Communications in Statistics: Simulation and Computation (37) 2010-2026
Partitioning the variance of a response by design levels is challenging for binomial and other discrete outcomes. Goldstein (2003) proposed four definitions for variance partitioning coefficients (VPC) under a two-level logistic regression model. In this study, we explicitly derived formulae for multi-level logistic regression model and subsequently studied the distributional...
Removal of dissolved organic matter by anion exchange: Effect of dissolved organic matter properties
T.H. Boyer, P.C. Singer, G. R. Aiken
2008, Environmental Science & Technology (42) 7431-7437
Ten isolates of aquatic dissolved organic matter (DOM) were evaluated to determine the effect that chemical properties of the DOM, such as charge density, aromaticity, and molecular weight, have on DOM removal by anion exchange. The DOM isolates were characterized as terrestrial, microbial, or intermediate humic substances...
Identifying mangrove species and their surrounding land use and land cover classes using object-oriented approach with a lacunarity spatial measure
S.W. Myint, C.P. Giri, L. Wang, Z. Zhu, S.C. Gillete
2008, GIScience and Remote Sensing (45) 188-208
Accurate and reliable information on the spatial distribution of mangrove species is needed for a wide variety of applications, including sustainable management of mangrove forests, conservation and reserve planning, ecological and biogeographical studies, and invasive species management. Remotely sensed data have been used for such purposes with mixed results. Our...
Use of sinkhole and specific capacity distributions to assess vertical gradients in a karst aquifer
K.J. McCoy, M.D. Kozar
2008, Environmental Geology (54) 921-935
The carbonate-rock aquifer in the Great Valley, West Virginia, USA, was evaluated using a database of 687 sinkholes and 350 specific capacity tests to assess structural, lithologic, and topographic influences on the groundwater flow system. The enhanced permeability of the aquifer is characterized in part by the many sinkholes, springs,...
The relative contribution of processes driving variability in flow, shear, and turbidity over a fringing coral reef: West Maui, Hawaii
C. D. Storlazzi, B. E. Jaffe
2008, Estuarine, Coastal and Shelf Science (77) 549-564
High-frequency measurements of waves, currents and water column properties were made on a fringing coral reef off northwest Maui, Hawaii, for 15 months between 2001 and 2003 to aid in understanding the processes governing flow and turbidity over a range of time scales and their contributions to annual budgets. The...
Fall diets of alewife, rainbow smelt, and slimy sculpin in the profundal zone of southern Lake Ontario during 1994-2005 with an emphasis on occurrence of Mysis relicta
M. G. Walsh, R. O'Gorman, T. Strang, W.H. Edwards, L. G. Rudstam
2008, Conference Paper, Aquatic Ecosystem Health and Management
In Lake Ontario, factors including the collapse of the burrowing amphipod, Diporeia spp., changes in the distribution and composition of the prey fish community, and occurrence of exotic cladocerans Bythotrephes longimanus and Cercopagis pengoi have led to changes in predation pressure on the remaining native profundal macroinvertebrate, Mysis relicta. We...
Phytolacca americana from contaminated and noncontaminated soils of South Korea: Effects of elevated temperature, CO2 and simulated acid rain on plant growth response
Y.-O. Kim, R. J. Rodriguez, E.J. Lee, R. S. Redman
2008, Journal of Chemical Ecology (34) 1501-1509
Chemical analyses performed on the invasive weed Phytolacca americana (pokeweed) growing in industrially contaminated (Ulsan) and noncontaminated (Suwon) sites in South Korea indicated that the levels of phenolic compounds and various elements that include some heavy metals (Al, As, B, Cd, Co, Cu, Fe, Mn, Ni, Pb, and Zn) were...
M-log A observations for recent large earthquakes
Thomas C. Hanks, W. H. Bakun
2008, Bulletin of the Seismological Society of America (98) 490-494
Using a magnitude (M)-log area (A) dataset augmented with seven large (M > 7.0) earthquakes occurring since Wells and Coppersmith (1994), this short note assesses the current validity of the bilinear M-log A relations for continental, strike-slip earthquakes proposed by Hanks and Bakun (2002), in particular the L-model scaling at...
The metallogeny of Late Triassic rifting of the Alexander terrane in southeastern Alaska and northwestern British Columbia
C. D. Taylor, W. R. Premo, A. L. Meier, J.E. Taggart Jr.
2008, Conference Paper, Economic Geology
A belt of unusual volcanogenic massive sulfide (VMS) occurrences is located along the eastern margin of the Alexander terrane throughout southeastern Alaska and northwestern British Columbia and exhibits a range of characteristics consistent with a variety of syngenetic to epigenetic deposit types. Deposits within this belt include Greens Creek and...
Methyl tert-butyl ether (MTBE) in public and private wells in New Hampshire: Occurrence, factors, and possible implications
J. D. Ayotte, D.M. Argue, F.J. McGarry, J.R. Degnan, L. Hayes, S. M. Flanagan, D.R. Helsel
2008, Environmental Science & Technology (42) 677-684
Methyl tert-butyl ether (MTBE) concentrations ???0.2 ??g/L were found in samples of untreated water in 18% of public-supply wells (n = 284) and 9.1% of private domestic wells (n = 264) sampled in 2005 and 2006 in New Hampshire. In counties that used reformulated gasoline (RFG), MTBE occurred at or...
Restoring habitat permeability to roaded landscapes with isometrically-scaled wildlife crossings
J.A. Bissonette, W. Adair
2008, Biological Conservation (141) 482-488
Globally, human activities impact from one-third to one-half of the earth's land surface; a major component of development involves the construction of roads. In the US and Europe, road networks fragment normal animal movement patterns, reduce landscape permeability, and increase wildlife-vehicle collisions, often with serious wildlife population and human health...
Proximate cues for a short-distance migratory species: An application of survival analysis
J. Meunier, R. Song, R.S. Lutz, D. E. Andersen, K.E. Doherty, J.G. Bruggink, E. Oppelt
2008, Journal of Wildlife Management (72) 440-448
Investigation of bird migration has often highlighted the importance of external factors in determining timing of migration However, little distinction has been made between short- and long-distance migrants and between local and flight birds (passage migrants) in describing migration chronology. In addition, measures of food abundance as a proximate factor...
Possible young faulting in the Piedmont of North-Central Colorado
D. R. Shawe, T. A. Steven, D. H. Knepper Jr.
2008, Mountain Geologist (45) 1-19
We interpret several linear topographic scarps in both alluvium and bedrock in the piedmont of north-central Colorado between Denver and Wyoming to be fault scarps. The scarps, ranging from tens of feet to about 150 ft in height, bound trough-like (graben and half-graben) forms. These features coincide in part with...
Titan's inventory of organic surface materials
Ralph D. Lorenz, Karl L. Mitchell, Randolph L. Kirk, Alexander G. Hayes, Oded Aharonson, Howard A. Zebker, Philipe Paillou, Jani Radebaugh, Jonathan I. Lunine, Michael A. Janssen, Stephen D. Wall, Rosaly Lopes, Bryan Stiles, Steven J. Ostro, Giuseppe Mitri, Ellen R. Stofan
2008, Geophysical Research Letters (35)
Cassini RADAR observations now permit an initial assessment of the inventory of two classes, presumed to be organic, of Titan surface materials: polar lake liquids and equatorial dune sands. Several hundred lakes or seas have been observed, of which dozens are each estimated to contain more hydrocarbon liquid than the...
Storm-damaged saline-contaminated boreholes as a means of aquifer contamination
D.A. Carlson, T. P. Van Biersel, L.R. Milner
2008, Ground Water (46) 69-79
Saline water from a storm surge can flow down storm-damaged submerged water supply wells and contaminate boreholes and surrounding aquifers. Using data from conventional purging techniques, aquifer test response analysis, chemical analysis, and regression analysis of chloride/silica (Cl/Si) ratio, equations were derived to estimate the volume of saline water intrusion...
Surface drift prediction in the Adriatic Sea using hyper-ensemble statistics on atmospheric, ocean and wave models: Uncertainties and probability distribution areas
M. Rixen, E. Ferreira-Coelho, R. Signell
2008, Journal of Marine Systems (69) 86-98
Despite numerous and regular improvements in underlying models, surface drift prediction in the ocean remains a challenging task because of our yet limited understanding of all processes involved. Hence, deterministic approaches to the problem are often limited by empirical assumptions on underlying physics. Multi-model hyper-ensemble forecasts, which exploit the power...
Modelling the impact of wind stress and river discharge on Danshuei River plume
W.-C. Liu, W.-B. Chen, R. T. Cheng, M.-H. Hsu
2008, Applied Mathematical Modelling (32) 1255-1280
A three-dimensional, time-dependent, baroclinic, hydrodynamic and salinity model, UnTRIM, was performed and applied to the Danshuei River estuarine system and adjacent coastal sea in northern Taiwan. The model forcing functions consist of tidal elevations along the open boundaries and freshwater inflows from the main stream and major tributaries in the...
Deformation and rupture of the oceanic crust may control growth of Hawaiian volcanoes
J.-L. Got, V. Monteiller, J. Monteux, R. Hassani, P. Okubo
2008, Nature (451) 453-456
Hawaiian volcanoes are formed by the eruption of large quantities of basaltic magma related to hot-spot activity below the Pacific Plate. Despite the apparent simplicity of the parent process - emission of magma onto the oceanic crust - the resulting edifices display some topographic complexity. Certain features, such as rift...
Porewater biogeochemistry and soil metabolism in dwarf red mangrove habitats (Twin Cays, Belize)
R.Y. Lee, W.P. Porubsky, Ilka C. Feller, K.L. McKee, S.B. Joye
2008, Biogeochemistry (87) 181-198
Seasonal variability in biogeochemical signatures was used to elucidate the dominant pathways of soil microbial metabolism and elemental cycling in an oligotrophic mangrove system. Three interior dwarf mangrove habitats (Twin Cays, Belize) where surface soils were overlain by microbial mats were sampled during wet and dry periods of the year....
Evaporite-karst problems and studies in the USA
K.S. Johnson
2008, Conference Paper, Environmental Geology
Evaporites, including rock salt (halite) and gypsum (or anhydrite), are the most soluble among common rocks; they dissolve readily to form the same types of karst features that commonly are found in limestones and dolomites. Evaporites are present in 32 of the 48 contiguous states in USA, and they underlie...
Survival of cool and warm freshwater fish following chloramine-T exposure
M.P. Gaikowski, W.J. Larson, W.H. Gingerich
2008, Aquaculture (275) 20-25
Chloramine-T is presently available in the USA to control mortalities associated with bacterial gill disease or external columnaris only through an Investigational New Animal Drug Permit authorized by the US Food and Drug Administration (FDA). Its US approval hinges on FDA's acceptance of several key data, including those describing animal...
A simulation/optimization model for groundwater resources management in the Afram Plains area, Ghana
S.M. Yidana
2008, Journal of Environmental Hydrology (16) 1-14
A groundwater flow simulation model was developed using available hydrogeo logical data to A groundwater flow simulation model was developed using available hydrogeological data to describe groundwater flow in the Afram Plains area. A nonlinear optimization model was then developed and solved for the management of groundwater resources to meet...
Radiometric calibration stability and inter-calibration of solar-band instruments in orbit using the moon
T.C. Stone
2008, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
With the increased emphasis on monitoring the Earth's climate from space, more stringent calibration requirements are being placed on the data products from remote sensing satellite instruments. Among these are stability over decade-length time scales and consistency across sensors and platforms. For radiometer instruments in the solar reflectance wavelength range...
NOAA/West Coast and Alaska Tsunami Warning Center Pacific Ocean response criteria
P. Whitmore, H. Benz, M. Bolton, G. Crawford, L. Dengler, G. Fryer, J. Goltz, R. Hansen, K. Kryzanowski, S. Malone, D. Oppenheimer, E. Petty, G. Rogers, Jim Wilson
2008, Science of Tsunami Hazards (27) 1-19
New West Coast/Alaska Tsunami Warning Center (WCATWC) response criteria for earthquakes occurring in the Pacific basin are presented. Initial warning decisions are based on earthquake location, magnitude, depth, and - dependent on magnitude - either distance from source or precomputed threat estimates generated from tsunami models. The new criteria will...
Temporal variation and the effect of rainfall on metals flux from the historic Beatson mine, Prince William Sound, Alaska, USA
L.L. Stillings, A. L. Foster, R.A. Koski, L. Munk, Wayne C. Shanks III
2008, Applied Geochemistry (23) 255-278
Several abandoned Cu mines are located along the shore of Prince William Sound, AK, where the effect of mining-related discharge upon shoreline ecosystems is unknown. To determine the magnitude of this effect at the former Beatson mine, the largest Cu mine in the region and a Besshi-type massive sulfide ore...
