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Environment

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Displaying 301 - 325 of 537

Rate Constants for the Reactions between OH and Perfluorinated Alkenes

February 20, 2011
Author(s)
Vladimir L. Orkin, Gregory A. Poskrebyshev, Michael J. Kurylo III
The rate constants for the reactions of OH radicals with fully fluorinated alkenes containing different number of –CF3 groups next to olefinic carbon, CF2=CF2, CF2=CFCF3, CF3CF=CFCF3, (CF3)2C=CFC2F5 were measured using the flash photolysis resonance

Methylmercury photodegradation influenced by sea ice cover in Arctic marine ecosystems

January 16, 2011
Author(s)
David Point, J E. Sonke, Russell D. Day, David G. Roseneau, Keith A. Hobson, Stacy Schuur, Amanda Moors, Rebecca Pugh, Olivier F. Donard, Paul R. Becker
Despite two decades of research on mercury in northern environments, we do not fully understand the high levels of this pollutant in Arctic Biota. The presumption that global anthropogenic mercury emissions and Arctic atmospheric mercury depletion events

A Mathematical Model of Atmospheric Retention of Man-made CO_2 Emissions

December 21, 2010
Author(s)
Bert W. Rust
Rust and Thijsse [Proc. CSC'07 (2007) pp. 10-16], [CiSE, Vol. 10 (2008) pp. 49-59] have shown that global annual average temperature anomalies T(t) vary linearly with atmospheric CO_2 concentrations c(t). The c(t) can be related to man-made CO_2 emissions

Changing Environmental Regulations and the Electronics Industry

November 10, 2010
Author(s)
John V. Messina, Eric D. Simmon, Kevin G. Brady
In 2008, the European Union (EU) started a major review of its new class of environmental regulations with a broad review of the Restriction of Hazardous Substances (RoHS) and the Waste Electrical and Electronic Equipment (WEEE) Directives. The RoHS/WEEE

SEABIRD TISSUE ARCHIVAL AND MONITORING PROJECT: Project Overview, and Updated Protocols for Collecting and Banking Seabird Eggs

July 29, 2010
Author(s)
Lauren B. Rust, Rebecca S. Pugh, Amanda J. Moors, Stacy S. Schuur, David G. Roseneau, Paul R. Becker
The Seabird Tissue and Archival Monitoring Project (STAMP) is a collaborative effort by the U.S. Fish and Wildlife Service (USFWS), the Alaska Maritime National Wildlife Refuge (AMNWR), and the National Institute of Standards and Technology (NIST) to

Kinetics of the Thermal Reaction of H Atoms with Propyne

April 15, 2010
Author(s)
Claudette M. Rosado-Reyes, Jeffrey A. Manion, Wing Tsang
The reaction of hydrogen atoms with propyne(CH≡CCH3) has been investigated in a heated single pulse shock tube at temperatures of 870-1145K and pressures of 2-9 bar. Stable products from various reaction channels (terminal and non-terminal H addition, and

Ultra-Sensitive Optical Measurements of High-J Transitions in the O2 A-band

November 24, 2009
Author(s)
Daniel K. Havey, Joseph T. Hodges, David A. Long, Mitchio Okumura, Charles E. Miller
We report frequency-stabilized cavity ring-down spectroscopy measurements of high-J O2 A-band magnetic dipole line parameters. Our goals were to measure intensities and line shape parameters for the primary isotopologue of O2 in the A-band region and to

Atmospheric Retention of Man-made CO 2 Emissions

June 8, 2009
Author(s)
Bert W. Rust
Rust and Thijsse have shown that global annual average temperature anomalies T(t i) vary linearly with atmospheric CO 2 concentrations c(t i). The c(t i) can be related to man-made CO 2 emissions F(t i) by a linear regression model whose solution vector

Fish-Related Standard Reference Materials

February 1, 2009
Author(s)
Michele M. Schantz, Steven J. Christopher, William C. Davis, Russell D. Day, Jennifer M. Lynch, John R. Kucklick, Stephen E. Long, Elizabeth A. Mackey, Barbara J. Porter, Dianne L. Poster, Katherine E. Sharpless, Gregory C. Turk, Stephen A. Wise
The National Institute of Standards and Technology (NIST) has developed four Standard Reference Materials (SRMs) related to the monitoring of contaminants in fish and marine mammals: SRM 1588b Organics in Cod Liver Oil, SRM 1945 Organics in Whale Blubber

Consideration and Influence of Complexed forms of Mercury Species on the reactivity Patterns Determined by Speciated Isotope Dilution Model Approaches: A Case for Natural Biological Reference Materials

June 1, 2008
Author(s)
David Point, J. I. Garcia Alonso, William C. Davis, Steven J. Christopher, Aurore Guichard, O.F. X. Donard, Paul R. Becker, Gregory C. Turk, Stephen A. Wise
The origins and the processes driving the inadvertent transformations of inorganic mercury (iHg) and methylmercury (MeHg) in cryogenically stored and homogenized fresh-frozen versus freeze-dried biological Standard Reference Materials (SRM) were

Monitoring Contaminants in Seabirds: The Importance of Specimen Banking

November 13, 2007
Author(s)
Stacy S. Vander-Pol, Paul R. Becker
Historically, contaminants in seabird tissues were monitored by considering physically visible effects; however, subtle, sub-lethal effects are also important. Several long-term monitoring and specimen banking programs are in place for seabirds, and the

Marine Environmental Specimen Bank: Clean Room and Specimen Bank Protocols

January 1, 2007
Author(s)
Rebecca S. Pugh, Michael B. Ellisor, Amanda J. Moors, Barbara J. Porter, Paul R. Becker
The National Biomonitoring Specimen Bank (NBSB) was established in 1979 from the pilot Environmental Specimen Bank Program and is maintained at the National Institute of Standards and Technology. Numerous research projects and programs have been developed
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