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Articles 140341 - 140370 of 303100
Full-Text Articles in Physical Sciences and Mathematics
Heavy Metal Contamination Of Soils: Sources, Indicators And Assessment, Zhenli He, Jiali Shentu, Xiaoe Yang, Virupax C. Baligar, Tiequan Zhang, Peter J. Stoffella
Heavy Metal Contamination Of Soils: Sources, Indicators And Assessment, Zhenli He, Jiali Shentu, Xiaoe Yang, Virupax C. Baligar, Tiequan Zhang, Peter J. Stoffella
21st International Conference on Environmental Indicators (ICEI 2015)
No abstract provided.
Managing Eutrophication In The Great Lakes: The Primary Production Story, G. D. Haffner, E. Hillis, M. Fitzpatrick, D. Porta
Managing Eutrophication In The Great Lakes: The Primary Production Story, G. D. Haffner, E. Hillis, M. Fitzpatrick, D. Porta
21st International Conference on Environmental Indicators (ICEI 2015)
No abstract provided.
Quantitative Biomonitoring Of Water Quality For Pops Using Freshwater Mussels, Ken G. Drouillard
Quantitative Biomonitoring Of Water Quality For Pops Using Freshwater Mussels, Ken G. Drouillard
21st International Conference on Environmental Indicators (ICEI 2015)
No abstract provided.
Tale Of Three Estuaries: Comparative Evaluation Of Geochemical And Mineralogical Intertidal Sediments In North Cornwall, Southwest England, T. D.T. Oyedotun
Tale Of Three Estuaries: Comparative Evaluation Of Geochemical And Mineralogical Intertidal Sediments In North Cornwall, Southwest England, T. D.T. Oyedotun
21st International Conference on Environmental Indicators (ICEI 2015)
No abstract provided.
The Phosphorus Paradox: Productive Agricultural And Water Quality, Andrew N. Sharpley
The Phosphorus Paradox: Productive Agricultural And Water Quality, Andrew N. Sharpley
21st International Conference on Environmental Indicators (ICEI 2015)
No abstract provided.
Governance For Environmental Protection Of The Great Lakes: Recovering Nutrients From Greenhouse Post-Production Water, Deanna Nemeth, Shalin Khosla, Greg Devos, Beverly Alder, Dan Mcdonald, Don Hillborn
Governance For Environmental Protection Of The Great Lakes: Recovering Nutrients From Greenhouse Post-Production Water, Deanna Nemeth, Shalin Khosla, Greg Devos, Beverly Alder, Dan Mcdonald, Don Hillborn
21st International Conference on Environmental Indicators (ICEI 2015)
No abstract provided.
Water Stratification Is Key To Forming Algal Bloom In The Backwater Area Of The Three Gorges Reservoir, China, L. Zhang, L. Fu, J. Yu, C. Zhou, D. Haffner
Water Stratification Is Key To Forming Algal Bloom In The Backwater Area Of The Three Gorges Reservoir, China, L. Zhang, L. Fu, J. Yu, C. Zhou, D. Haffner
21st International Conference on Environmental Indicators (ICEI 2015)
No abstract provided.
Using Ecological Indicators To Assess Ecosystem Health In Tropical Reservoirs In Brazil, Juliana Pomari, Douglas Kane, Rosa Antonia Romero Ferreira, Marcos Gomes Nogueira
Using Ecological Indicators To Assess Ecosystem Health In Tropical Reservoirs In Brazil, Juliana Pomari, Douglas Kane, Rosa Antonia Romero Ferreira, Marcos Gomes Nogueira
21st International Conference on Environmental Indicators (ICEI 2015)
No abstract provided.
Colonial Waterbirds As Indicators Of Environmental Change, Craig Hebert
Colonial Waterbirds As Indicators Of Environmental Change, Craig Hebert
21st International Conference on Environmental Indicators (ICEI 2015)
No abstract provided.
Climate Warming Reduces Essential Fatty Acid Production In Algae, Michael T. Arts, Stefanie M. Hixson, Samantha Mercieca
Climate Warming Reduces Essential Fatty Acid Production In Algae, Michael T. Arts, Stefanie M. Hixson, Samantha Mercieca
21st International Conference on Environmental Indicators (ICEI 2015)
No abstract provided.
Using Agri-Environmental Indicators To Communicate Risks To Water Quality From Horticulture Production In Ontario, Donna Speranzini, V. Li, A. Jamieson, P. Handyside, D. K. Reid, P. Joose
Using Agri-Environmental Indicators To Communicate Risks To Water Quality From Horticulture Production In Ontario, Donna Speranzini, V. Li, A. Jamieson, P. Handyside, D. K. Reid, P. Joose
21st International Conference on Environmental Indicators (ICEI 2015)
No abstract provided.
Book Review: High G Flight - Physiological Effects And Countermeasures, Stefan Kleinke
Book Review: High G Flight - Physiological Effects And Countermeasures, Stefan Kleinke
International Journal of Aviation, Aeronautics, and Aerospace
This review provides insight on the content and a review of the quality of the recent release of High G Flight - Physiological Effects and Countermeasures from Ashgate Publications.
This review does not reflect the views of IJAAA or ERAU. This work was not peer reviewed.
High G Flight - Physiological Effects and Countermeasures
Periphyton Community Dynamics As An Indicator Of Water Quality, C. Chantler, J. Benallick, C. Sinclair, N. Kanavillil
Periphyton Community Dynamics As An Indicator Of Water Quality, C. Chantler, J. Benallick, C. Sinclair, N. Kanavillil
21st International Conference on Environmental Indicators (ICEI 2015)
No abstract provided.
Developing Great Lakes Bioindicators Of Environmental Condition And Recovery From Degradation With Reference To Watershed-Based Risk Of Stress, Jan Ciborowski, Katya Kovalenko, George Host, Robert W. Howe, Euan Reavie, Terry N. Brown, Valerie Brady, Nicholas Danz, Gerald L. Niemi, Cai Meijun, Lucinda B. Johnson
Developing Great Lakes Bioindicators Of Environmental Condition And Recovery From Degradation With Reference To Watershed-Based Risk Of Stress, Jan Ciborowski, Katya Kovalenko, George Host, Robert W. Howe, Euan Reavie, Terry N. Brown, Valerie Brady, Nicholas Danz, Gerald L. Niemi, Cai Meijun, Lucinda B. Johnson
21st International Conference on Environmental Indicators (ICEI 2015)
No abstract provided.
Soil Carbon Pool As An Environmental Indicator, Rattan Lal
Soil Carbon Pool As An Environmental Indicator, Rattan Lal
21st International Conference on Environmental Indicators (ICEI 2015)
No abstract provided.
Climatology And Atmospheric Chemistry Of The Non-Methane Hydrocarbons Ethane And Propane Over The North Atlantic, Detlev Helmig, Mauricio Muñoz, Jacques Hueber, Claudio Mazzoleni, Lynn Mazzoleni, Richard C. Owen, Maria Val-Martin, Paulo Fialho, Christian Plass-Duelmer, Paul I. Palmer, Alastair C. Lewis, Gabriele Pfister
Climatology And Atmospheric Chemistry Of The Non-Methane Hydrocarbons Ethane And Propane Over The North Atlantic, Detlev Helmig, Mauricio Muñoz, Jacques Hueber, Claudio Mazzoleni, Lynn Mazzoleni, Richard C. Owen, Maria Val-Martin, Paulo Fialho, Christian Plass-Duelmer, Paul I. Palmer, Alastair C. Lewis, Gabriele Pfister
Department of Chemistry Publications
A record spanning ten years of non-methane hydrocarbon (NMHC) data from the Pico Mountain Observatory (PMO), Pico Island, Azores, Portugal, was analyzed for seasonal NMHC behavior, atmospheric processing, and trends, focusing on ethane and propane. The location of this site in the central North Atlantic, at an elevation of 2225 m asl, allows these data to be used to investigate the background conditions and pollution transport events occurring in the lower free North Atlantic troposphere. The quantity ln([propane]/[ethane]) was used as an indicator of both photochemical processing and a marker for the occurrence of pollution transport events detected at the …
On Simple Relations Between Difference-In-Differences And Negative Outcome Control Of Unobserved Confounding, Tamar Sofer, David B. Richardson, Elena Colincino, Joel Schwartz, Eric J. Tchetgen Tchetgen
On Simple Relations Between Difference-In-Differences And Negative Outcome Control Of Unobserved Confounding, Tamar Sofer, David B. Richardson, Elena Colincino, Joel Schwartz, Eric J. Tchetgen Tchetgen
Harvard University Biostatistics Working Paper Series
No abstract provided.
Lepski's Method And Adaptive Estimation Of Nonlinear Integral Functionals Of Density, Rajarshi Mukherjee, Eric J. Tchetgen Tchetgen, James M. Robins
Lepski's Method And Adaptive Estimation Of Nonlinear Integral Functionals Of Density, Rajarshi Mukherjee, Eric J. Tchetgen Tchetgen, James M. Robins
Harvard University Biostatistics Working Paper Series
No abstract provided.
Controllable And Switchable Drug Delivery Of Ibuprofen From Temperature Responsive Composite Nanofibers, Toan Tran, Mariana Hernandez, Dhruvil Patel, Elena Burns, Vanessa Peterman, Ji Wu
Controllable And Switchable Drug Delivery Of Ibuprofen From Temperature Responsive Composite Nanofibers, Toan Tran, Mariana Hernandez, Dhruvil Patel, Elena Burns, Vanessa Peterman, Ji Wu
Department of Chemistry and Biochemistry Faculty Publications
Composited electrospun nanofibers made of temperature-responsive poly(N-isopropylacrylamide) (pNIPAM) and biodegradable poly (ε-caprolactone) (PCL) can be utilized for ‘on-demand’ and controlled drug release of ibuprofen without burst effect for potential pharmaceutical applications. Three types of nanofibers, PCL, pNIPAM and pNIPAM/PCL composite NFs containing ibuprofen were fabricated using electrospinning techniques. Ibuprofen release rates from PCL NFs are not affected by the temperature in the range of 22–34°C (less than 10%). In contrast, the ibuprofen release rates from pNIPAM NFs are very sensitive to the change in temperature, which is five times higher at 22°C compared to 34°C. However, there is a serious …
Materials At The Atomic Scale: A Key To Exploring The Vast Reaches Of Space, Jr Dennison
Materials At The Atomic Scale: A Key To Exploring The Vast Reaches Of Space, Jr Dennison
Presentations
A critical technology to master for any interplanetary probe is mitigation of risks from spacecraft charging and electrostatic discharge, which cause the majority of environmentally-induced “anomalies.” Understanding how charge is acquired through interaction with space fluxes of electrons, ions and photons; how temperature, dose and fields affect redistributed of charge within spacecraft materials; and what triggers electrostatic arcs all require the study of how charged particles interact with the structure of materials on an atomic scale. This seminar presents an overview of the dynamic properties of materials underlying spacecraft charging, how the material’s structure affects these properties, which properties are …
A Method To Detect Aac Audio Forgery, Qingzhong Liu, Andrew Sung, Lei Chen, Ming Yang, Zhongxue Chen, Yanxin Liu, Jing Zhang
A Method To Detect Aac Audio Forgery, Qingzhong Liu, Andrew Sung, Lei Chen, Ming Yang, Zhongxue Chen, Yanxin Liu, Jing Zhang
Department of Information Technology Faculty Publications
Advanced Audio Coding (AAC), a standardized lossy compression scheme for digital audio, which was designed to be the successor of the MP3 format, generally achieves better sound quality than MP3 at similar bit rates. While AAC is also the default or standard audio format for many devices and AAC audio files may be presented as important digital evidences, the authentication of the audio files is highly needed but relatively missing. In this paper, we propose a scheme to expose tampered AAC audio streams that are encoded at the same encoding bit-rate. Specifically, we design a shift-recompression based method to retrieve …
Aviation Bird Hazard In Nexrad Dual Polarization Weather Radar Confirmed By Visual Observations, Bradley M. Muller, Frederick R. Mosher, Christopher G. Herbster, Anthony T. Brickhouse
Aviation Bird Hazard In Nexrad Dual Polarization Weather Radar Confirmed By Visual Observations, Bradley M. Muller, Frederick R. Mosher, Christopher G. Herbster, Anthony T. Brickhouse
International Journal of Aviation, Aeronautics, and Aerospace
Birds represent a significant hazard to flying aircraft as illustrated by the “Miracle on the Hudson” encounter in 2009 between U.S. Airways Flight 1549 and a flock of Canada Geese, forcing the flight to ditch in the river. Birds are common in the skies over Florida during the spring migration season, and often appear in the National Weather Service’s (NWS) NEXRAD weather radar imagery as an easily recognizable signature known as a “roost ring.” This paper presents a NEXRAD roost ring case in central Florida in a rare instance where the signatures were confirmed by visual observations of the birds. …
Global Optimized Isothermal And Nonlinear Models Of Earth’S Standard Atmosphere, Nihad E. Daidzic, Ph.D.,
Global Optimized Isothermal And Nonlinear Models Of Earth’S Standard Atmosphere, Nihad E. Daidzic, Ph.D.,
International Journal of Aviation, Aeronautics, and Aerospace
Both, a global isothermal temperature model and a nonlinear quadratic temperature model of the ISA was developed and presented here. Constrained optimization techniques in conjunction with the least-square-root approximations were used to design best-fit isothermal models for ISA pressure and density changes up to 47 geopotential km for NLPAM, and 86 orthometric km for ISOAM respectively. The mass of the dry atmosphere and the relevant fractional-mass scale heights have been computed utilizing the very accurate eight-point Gauss-Legendre numerical quadrature for both ISOAM and NLPAM. Both, the ISOAM and the NLPAM represent viable alternatives to ISA in many practical applications and …
The Nustar Extragalactic Surveys: Overview And Catalog From The Cosmos Field, F. Civano, R. C. Hickox, S. Puccetti, A. Comastri
The Nustar Extragalactic Surveys: Overview And Catalog From The Cosmos Field, F. Civano, R. C. Hickox, S. Puccetti, A. Comastri
Dartmouth Scholarship
To provide the census of the sources contributing to the X-ray background peak above 10 keV, NuSTAR is performing extragalactic surveys using a three-tier "wedding cake" approach. We present the NuSTAR survey of the COSMOS field, the medium sensitivity and medium area tier, covering 1.7 deg2 and overlapping with both Chandra and XMM-Newton data. This survey consists of 121 observations for a total exposure of ~3 Ms. To fully exploit these data, we developed a new detection strategy, carefully tested through extensive simulations. The survey sensitivity at 20% completeness is 5.9, 2.9 and 6.4 x 10^-14 erg/cm2/s in the 3-24 …
The Nustar Extragalactic Surveys: Initial Results And Catalog From The Extended Chandra Deep Field South, J. R. Mullaney, A. Del-Moro, J. Aird, D. M. Alexander, F. M. Civano, R. C. Hickox
The Nustar Extragalactic Surveys: Initial Results And Catalog From The Extended Chandra Deep Field South, J. R. Mullaney, A. Del-Moro, J. Aird, D. M. Alexander, F. M. Civano, R. C. Hickox
Dartmouth Scholarship
We present initial results and the source catalog from the NuSTAR survey of the Extended Chandra Deep Field South (hereafter, ECDFS) - currently the deepest contiguous component of the NuSTAR extragalactic survey program. The survey covers the full ~30 arcmin x 30 arcmin area of this field to a maximum depth of ~360 ks (~220 ks when corrected for vignetting at 3-24 keV), reaching sensitivity limits of ~1.3 x 10^-14 erg/cm2/s (3-8 keV), ~3.4 x 10^-14 erg/cm2/s (8-24 keV) and ~3.0 x 10^-14 erg/cm2/s (3-24 keV). Fifty four (54) sources are detected over the full field, although five of these …
Predicting Landscape-Scale Co 2 Flux At A Pasture And Rice Paddy With Long-Term Hyperspectral Canopy Reflectance Measurements, J. H. Matthes, S. H. Knox, C. Sturtevant, O. Sonnentag
Predicting Landscape-Scale Co 2 Flux At A Pasture And Rice Paddy With Long-Term Hyperspectral Canopy Reflectance Measurements, J. H. Matthes, S. H. Knox, C. Sturtevant, O. Sonnentag
Dartmouth Scholarship
Measurements of hyperspectral canopy reflectance provide a detailed snapshot of information regarding canopy biochemistry, structure and physiology. In this study, we collected 5 years of repeated canopy hyperspectral reflectance measurements for a total of over 100 site visits within the flux footprints of two eddy covariance towers at a pasture and rice paddy in northern California. The vegetation at both sites exhibited dynamic phenology, with significant interannual variability in the timing of seasonal patterns that propagated into interannual variability in measured hyperspectral reflectance. We used partial least-squares regression (PLSR) modeling to leverage the information contained within the entire canopy reflectance …
Panel Ii: Consumer Level - Overview, Eugenie L. Birch
Panel Ii: Consumer Level - Overview, Eugenie L. Birch
Eugenie L. Birch
No abstract provided.
Long-Lived Pluvial Episodes During Deposition Of The Navajo Sandstone, David B. Loope, Clinton M. Rowe
Long-Lived Pluvial Episodes During Deposition Of The Navajo Sandstone, David B. Loope, Clinton M. Rowe
David B. Loope
The Navajo Sandstone of the American Southwest was deposited at approximately 190 Ma in a giant, subtropical dune field near the western margin of Pangea. From this unit, we report thick intervals of dune cross-strata that were churned by insects and trampled by reptiles. Although dunes continued to migrate freely, the distribution of trace fossils shows that plant life in wet interdune areas sustained high levels of animal activity on the dunes for many thousands of years. We interpret this suite of structures as the record of a pluvial episode climatologically similar to the period of “greening” in the Sahara …
Wind Scour Of Navajo Sandstone At The Wave (Central Colorado Plateau, U.S.A.), David B. Loope, Winston M. Seiler, Joseph A. Mason, Marjorie A. Chan
Wind Scour Of Navajo Sandstone At The Wave (Central Colorado Plateau, U.S.A.), David B. Loope, Winston M. Seiler, Joseph A. Mason, Marjorie A. Chan
David B. Loope
At the Wave, a photogenic landform on the Utah–Arizona border, modern, southwesterly, sand-carrying winds abrade the Navajo Sandstone. Abundant trains of centimeter-scale, transverse, upwind-facing treads and risers cut sedimentary structures at a high angle. Central to the formation of these erosional steps are crusts produced by microbes lying just beneath exposed sandstone surfaces. Treads and risers are present on the walls of smoothly curved troughs at the Wave, on the walls of nearby circular scour pits, and on bedrock domes found at the center of scour pits. Because of their locations and orientations, the large-scale troughs and scour pits could …
New Stratigraphic Subdivision, Depositional Environment, And Age Estimate For The Upper Cretaceous Djadokhta Formation, Southern Ulan Nur Basin, Mongolia, Demberelyin Dashzeveg, Lowell Dingus, David B. Loope, Carl C. Swisher Iii, Togtokh Dulam, Mark R. Sweeney
New Stratigraphic Subdivision, Depositional Environment, And Age Estimate For The Upper Cretaceous Djadokhta Formation, Southern Ulan Nur Basin, Mongolia, Demberelyin Dashzeveg, Lowell Dingus, David B. Loope, Carl C. Swisher Iii, Togtokh Dulam, Mark R. Sweeney
David B. Loope
Studies of key and newly discovered sections of the Upper Cretaceous Djadokhta Formation along the southern margin of the Ulan Nur Basin allow a new subdivision based on lithology. The formation and its members were mapped at both Bayn Dzak, an area that includes the Flaming Cliffs, and Tugrugyin Shireh, an area about 50 km to the northwest of Bayn Dzak. Stratigraphic sections at both localities were remeasured. The considerably enlarged formation comprises a lower Bayn Dzak Member, dominated by moderate reddish orange sands with subordinate mudstone units, and an upper Tugrugyin Member, composed of pale orange to light gray …