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Articles by Christopher P. Higgins
Application of a Robin boundary condition to surface waves
Kai Håkon Christensen1,2*† and Jan Erik Hobæk Weber2† 1Research and Development Department, Norwegian Meteorological Institute, Oslo, Norway 2Department of Geosciences, University of Oslo, Oslo, Norway Surface effects on deep-water gravity waves are investigated theoretically by the application of a Robin boundary condition with a complex Robin parameter, R=Rr+iRi. The Robin condition combines the shear stress and the horizontal velocity at the ocean surface.
Hydrothermal Alkaline Treatment for Destruction of Per- and Polyfluoroalkyl Substances in Aqueous Film-Forming Foam
The widespread use of aqueous film-forming foam (AFFF) for firefighting activities (e.g., fire training to extinguish fuel-based fires at aircraft facilities) has led to extensive groundwater and soil contamination by per- and polyfluoroalkyl substances (PFASs) that are highly recalcitrant to destruction using conventional treatment technologies.
Mass-Based, Field-Scale Demonstration of PFAS Retention within AFFF-Associated Source Areas
Download Hi-Res ImageDownload to MS-PowerPointCite This:Environ. Sci. Technol. 2020, XXXX, XXX RETURN TO ARTICLES ASAPPREVContaminants in Aqua...Contaminants in Aquatic and Terrestrial EnvironmentsNEXT David T. Adamson*, Anastasia Nickerson, Poonam R. Kulkarni Poonam R. Kulkarni GSI Environmental Inc., 2211 Norfolk Suite 1000, Houston, Texas 77098, United States , Christopher P.
Adding team-based financial incentives to the Carrot Rewards physical activity app increases daily step count on a population scale: a 24-week matched case control study
Abstract Background Mobile health applications (mHealth apps) targeting physical inactivity have increased in popularity yet are usually limited by low engagement. This study examined the impact of adding team-based incentives (Step Together Challenges, STCs) to an existing mHealth app (Carrot Rewards) that rewarded individual physical activity achievements.
Assessing Human Health Risks from Per- and Polyfluoroalkyl Substance (PFAS)-Impacted Vegetable Consumption: A Tiered Modeling Approach
Introduction Extensive contamination of the environment has resulted from the use of per- and polyfluoroalkyl substances (PFASs) in industrial and consumer products (e.g., paper and food packaging, nonstick products, chrome plating, aqueous film-forming foam [AFFF], textiles) and their unique hydrophobic and lipophobic properties.(1) Long-chain perfluoroalkyl carboxylates (PFCAs; i.e., perfluorooctanoate [PFOA] and longer) and long-chain perfluoroalkyl sulfonates (PFSAs; i.e., perfluorohexane...
Rapid Destruction and Defluorination of Perfluorooctanesulfonate by Alkaline Hydrothermal Reaction
Here, we report a promising new strategy for achieving rapid and complete destruction of perfluorooctanesulfonate (PFOS) through the application of hydrothermal conditions (condensed water, 200–350 °C, 2–16.5 MPa) to solutions amended with NaOH. Initial screening experiments with a wide range of solution amendments (e.g., acids, alkalis, oxidants, reductants) revealed highly variable extents of PFOS defluorination, ranging from 0% to 80% after 90 min of reaction at 350 °C.
Correction to “A Never-Ending Story of Per- and Polyfluoroalkyl Substances (PFASs)?”
The generic molecular formula for PFCAs in Figure 1 on page 2510 was presented incorrectly. It should be “Cn–1F2n–1–COOH” instead of “CnF2n+1–COOH”. A corrected version of the figure is shown below. The results and conclusions remain unchanged.Figure 1. “Family tree” of PFASs, including examples of individual PFASs and the number of peer-reviewed articles on them since 2002 (most of the studies focused on long-chain PFCAs, PFSAs and their major precursors).
A Never-Ending Story of Per- and Polyfluoroalkyl Substances (PFASs)?
Download Hi-Res ImageDownload to MS-PowerPointCite This:Environ. Sci. Technol. 2017, 51, 5 RETURN TO ISSUEPREVFeatureNEXT Zhanyun Wang† Jamie C. DeWitt‡ Christopher P. Higgins§ Ian T.
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