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Displaying 4526 - 4550 of 13217

Identifying risk factors for levels of perfluoroalkyl substances in the placenta in a high-risk pregnancy cohort in North Carolina

December 31, 2020
Author(s)
Jacqueline T. Bangma, Lauren A. Eaves, Kirsi Oldenburg, Jessica L. Reiner, Tracy Manuck, Rebecca C. Fry
… The objectives of this study were to examine PFAS levels in the placenta and identify sociodemographic risk factors in a high-risk pregnancy cohort (n=122) in Chapel Hill, North Carolina. We also examined the … Environmental Science and Technology … risk factors for levels of perfluoroalkyl substances in the placenta in a high-risk pregnancy cohort in North …

Development of a transition-edge sensor bilayer process providing new modalities for critical temperature control

September 21, 2020
Author(s)
Joel Weber, Kelsey Morgan, Daikang Yan, Christine Pappas, Abigail Wessels, Galen O'Neil, Douglas Bennett, Gene C. Hilton, Daniel Swetz, Joel Ullom, Daniel Schmidt
… Transition-edge sensors (TESs) are thermal detectors in which a superconducting film that is electrically biased in the superconducting-to-normal transition is used as a thermometer. In most TESs, the film is a superconductor-normal metal … Superconductor Science and Technology …

Evaluation of Thermal Optical Analysis (TOA) Using an Aqueous Binary Mixture

June 30, 2020
Author(s)
Courtney D. Grimes, Joseph Conny, Russell Dickerson
… technique used to measure the amount of particulate carbon in the atmosphere or deposited on a filter substrate, … than 2 % for EC, OC, total carbon (TC), and EC/TC. Error in TC among all temperature protocols was less than 5 % of … Environmental Science & Technology …

Error Estimation and Enhanced Stiffness Sensitivity in Contact Resonance Force Microscopy with a Multiple Arbitrary Frequency Lock-In Amplifier (MAFLIA)

May 29, 2020
Author(s)
Erin Flater, Arya Mugdha, Saurabh Gupta, William Hudson, Abbigail Fahrenkamp, Jason Killgore, Jesse Wilson
… In contact resonance force microscopy and related dynamic … and damping variations of the tip-sample contact result in variations in the cantilever's resonance frequency and quality factor as … Measurement Science & Technology … Error Estimation and Enhanced Stiffness Sensitivity in Contact Resonance Force Microscopy with a Multiple …

Damage sensing using a mechanophore crosslinked epoxy resin in single-fiber composites

May 26, 2020
Author(s)
Jeremiah W. Woodcock, Richard J. Sheridan, Ryan Beams, Stephan J. Stranick, William F. Mitchell, Jeffrey W. Gilman, Gale A. Holmes, Catherine L. Brinson, Vamshi Gudapati, hartman David, Amol Vaidya
… Here, we report a new method to directly visualize damage in composites. This is demonstrated in a model composite, comprised of a mechanophore … test (SFFT) samples reveals extensive damage zones in the epoxy in three dimensions at optical resolution about … Composites Science and Technology …

Ion transport and reordering in a two-dimensional trap array

May 19, 2020
Author(s)
Yong Wan, Robert Jordens, Stephen Erickson, Jenny Wu, Ryan S. Bowler, Ting R. Tan, Panyu Hou, Andrew C. Wilson, Dietrich Leibfried
… of connectivity. For trapped ions, this could be realized in a two-dimensional array of interconnected traps in which ions are separated, transported and recombined … we use a junction connecting orthogonal linear segments in a two-dimensional (2D) segmented linear Paul trap to …

Flame Propagation in the Mixtures of O2/N2 Oxidizer with Fluorinated Propene Refrigerants (CH2CFCF3, CHFCHCF3, CH2CHCF3)

February 21, 2020
Author(s)
Gregory T. Linteris, Valeri I. Babushok, Michael Hegetschweiler, Donald R. Burgess Jr.
… K for R-1234yf, R-1234ze(E) and R-1243zf, respectively, in air for standard conditions. Calculations of the 1D, … relevant reactions. Despite the relatively high F/H ratio in the reactants (2), the combustion is dominated by … R-1234yf and R-1234ze(E) capture qualitatively the trends in the experimental results. For certain values of the …

Wintertime CO2, CH4 and CO emissions estimation for the Washington DC / Baltimore metropolitan area using an inverse modeling technique

February 11, 2020
Author(s)
Israel Lopez Coto, Xinrong Ren, Olivia E. Salmon, Anna Karion, Paul B. Shepson, Russell R. Dickerson, Ariel Stein, Kuldeep R. Prasad, James R. Whetstone
… gas mitigation efforts are being mostly implemented in cities, the ability to quantify emission trends for urban … aircraft work has indicated large daily variability in the results. Here we use measurements of CO2, CH4 and CO … Results show good agreement with previous estimates in the area for all three gases. However, aliasing caused by …

Utica Shale Reactivity: CO2 Induced Pore Scale Changes in the Fracture Network and Matrix

January 3, 2020
Author(s)
Angela Goodman, Sean Sanguinito, Sittichai Natesakhawat, Patricia Cvetic, Barbara Kutchko, Andrew J. Allen
… Shale is expected to be a substantial fossil fuel resource in the future. Currently, 663.5 billion cubic feet of natural gas and oil are being produced from the Utica in Eastern Ohio. In this work, we examined the Utica Shale and its reactivity … Environmental Science & Technology …

Plastic Marine Debris Polymers in the Hawaiian Islands: Beach, Sea Surface, and Seafloor

October 2, 2019
Author(s)
Kayla C. Brignac, Melissa R. Jung, Cheryl King, Sarah-Jeanne Royer, Lauren Blickley, Megan Lamson, James Potemra, Jennifer Lynch
… transport, and effects of this emerging global contaminant in the environment. This is the first study to assess the polymeric differences of plastic marine debris in multiple environmental compartments across the Hawaiian … and Midway Atoll to spatially depict polymer distribution in the North Pacific marine environment. A total of 4472 …

Seasonally resolved excess urban methane emissions from the Baltimore/Washington, DC metropolitan region

September 5, 2019
Author(s)
Yaoxian Huang, Eric Kort, Anna Karion, John Ware, Kimberly Mueller, Sharon Gourdji
… and seasonal emissions from these important regions. In this study, we quantify seasonal and annual urban CH4 … and Washington, DC metropolitan regions by combining in-situ CH4 atmospheric observations from four tall tower stations with a Lagrangian Particle Dispersion Model in both forward convolutions to simulate observations and …

Perfluorinated Alkyl Acids in Hawaiian Cetaceans and Potential Biomarkers of Effect: Peroxisome Proliferator-Activated Receptor Alpha and Cytochrome P450 4A

August 30, 2019
Author(s)
Adam Kurtz, Jessica L. Reiner, Kristi West, Brenda Jensen
… Perfluorinated alkyl acids (PFAAs) are persistent in marine biota and are toxic to many species, including … marine mammals. We measured the concentrations of 15 PFAAs in liver and kidney samples of 16 species of stranded … mass spectrometry (LC- MS/MS). Eleven PFAAs in liver and nine PFAAs in kidney were detected, including …

Coherently displaced oscillator quantum states of a single trapped atom

June 11, 2019
Author(s)
Katherine C. McCormick, Jonas Keller, David J. Wineland, Andrew C. Wilson, Dietrich Leibfried
… The internal states can subsequently be read out in a projective measurement via state-dependent fluorescence, … for characterizing noise on the trapping potential in the frequency range of 500 Hz to 400 kH. … Quantum Science and Technology …

Lipidomics for wildlife disease etiology and biomarker discovery: a case study of pansteatitis outbreak in South Africa

March 5, 2019
Author(s)
John Bowden, Jeremy P. Koelmel, Candice Z. Ulmer, Susan Fogelson, Hannes Botha, Christina M. Jones, Jackie T. Bangma, Theresa M. Cantu, Matthew P. Guillette, Wilmien Luus-Powell, Joseph Sara, Willem J. Smit, Korin Albert, Harmony Miller, Berkley Olsen, Jason A. Cochran, Timothy J. Garrett, Richard A. Yost
… mechanisms associated with anthropogenic-induced stress in wildlife. Therefore, we examine the application of lipidomics for in situ studies on Mozambique tilapia (Oreochromis mossambicus) in Loskop Dam, South Africa. Mortality events of aquatic life … Environmental Science & Technology …
Displaying 4526 - 4550 of 13217
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