Microstructural stability and mechanical behavior of FeNiMnCr high entropy alloy under ion irradiation

Life cycle and management of carbon-14 from nuclear power generation

Pra: a perspective on strengths, current limitations, and possible improvements

The purpose of this study was to determine how vertical accretion rates in marshes vary through the millennia. Peat cores were collected in remnant and drained marshes in the Sacramento–San Joaquin Delta of California. Cubic smooth spline regression models were used to construct age–depth models and accretion histories for three remnant marshes. Estimated vertical accretion rates at these sites range from 0.03 to 0.49 cm year−1. The mean contribution of organic matter to soil volume at the remnant marsh sites is generally stable (4.73% to 6.94%), whereas the mean contribution of inorganic matter to soil volume has greater temporal variability (1.40% to 7.92%). The hydrogeomorphic position of each marsh largely determines the inorganic content of peat. Currently, the remnant marshes are keeping pace with sea level rise, but this balance may shift for at least one of the sites under future sea level rise scenarios.

/pdf/peat-accretion-histories-during-the-past-6-000-years-in-3glxcbsp2t.pdf

Peat accretion histories during the past 6,000 years in marshes of the Sacramento-San Joaquin Delta, CA, USA.

The purpose of this study was to determine peat formation processes throughout the millennia in four tidal marshes in the Sacramento-San Joaquin Delta. Peat cores collected at each site were analyzed for bulk density, loss on ignition, and percent organic carbon. Core data and spline fit age-depth models were used to estimate inorganic sedimentation, organic accumulation, and carbon seques- tration rates in the marshes. Bulk density and percent organic matter content of peat fluctuated through time at all sites, suggesting that peat formation processes are dynamic and responsive to watershed conditions. The balance between inorganic sedimentation and organic accumulation at the sites also varied through time, indicating that marshes may rely more strongly on either inorganic or organic matter for peat formation at particular times in their existence. Mean carbon sequestration rates found in this study (0.38-0.79 Mg C ha −1 year −1 ) were similar to other

https://ca.water.usgs.gov/pubs/Drexler%202011.pdf

R.T. Kennedy

Papers

Nuclear Regulatory Commission and its regulatory role