Results 1 to 10 of about 23,496 (137)

Insights into constraining coastal carbon export from radioisotopes

open access: yesFrontiers in Marine Science, 2023
Coastal shelves are important regions for carbon transformation and storage, however, constraining coastal carbon budgets and their uncertainties remains a challenge. Repeated sampling of a semi-restricted coastal basin in Nova Scotia, Canada was performed in 2019 utilizing the 238U-234Th isotope system to estimate carbon flux in both the water column ...
Erin E. Black   +4 more
openaire   +2 more sources

Sub-millimeter nuclear medical imaging with high sensitivity in positron emission tomography using beta-gamma coincidences

open access: yes, 2014
We present a nuclear medical imaging technique, employing triple-gamma trajectory intersections from beta^+ - gamma coincidences, able to reach sub-millimeter spatial resolution in 3 dimensions with a reduced requirement of reconstructed intersections ...
Habs, D.   +3 more
core   +4 more sources

Novel reverse radioisotope labelling experiment reveals carbon assimilation of marine calcifiers under ocean acidification conditions [PDF]

open access: yesMethods in Ecology and Evolution, 2020
Abstract Ocean acidification by anthropogenic carbon dioxide emissions is projected to depress metabolic and physiological activity in marine calcifiers. To evaluate the sensitivity of marine organisms against ocean acidification, the assimilation of nutrients into ...
Kozue Nishida   +9 more
openaire   +1 more source

Stem Cell Imaging: Tools to Improve Cell Delivery and Viability. [PDF]

open access: yes, 2016
Stem cell therapy (SCT) has shown very promising preclinical results in a variety of regenerative medicine applications. Nevertheless, the complete utility of this technology remains unrealized. Imaging is a potent tool used in multiple stages of SCT and
Jokerst, Jesse V, Wang, Junxin
core   +3 more sources

Development and characterization of carbon-bonded carbon fiber insulation for radioisotope space power systems [PDF]

open access: yes, 1985
The General-Purpose Heat Source (GPHS), an improved radioisotope heat source, employs a unique thermal insulation material, carbon-bonded carbon fiber (CBCF), to protect the fuel capsule and to help achieve the highest possible specific power. The CBCF insulation is made from chopped rayon fiber about 10 ..mu..m in diameter and 250 ..mu..m long, which ...
Wei, G. C., Robbins, J. M.
openaire   +2 more sources

Chronologies for Recent Peat Deposits Using Wiggle-matched Radiocarbon Ages: Problems with Old Carbon Contamination [PDF]

open access: yes, 2005
Dating sediments which have accumulated over the last few hundred years is critical to the calibration of longer-term paleoclimate records with instrumental climate data.
Charman, D.J., Garnett, M.H.
core   +1 more source

Isotopes in hydrology and hydrogeology [PDF]

open access: yes, 2019
The structure, status, and processes of the groundwater system, which can only be acquired through scientific research efforts, are critical aspects of water resource management. Isotope hydrology and hydrogeology is a genuinely interdisciplinary science.
Barbieri, Maurizio
core   +1 more source

Species sensitivity of zeolite minerals for uptake of mercury solutes [PDF]

open access: yes, 2006
The uptake of inorganic Hg2+ and organometallic CH3Hg+ from aqueous solutions by 11 different natural zeolites has been investigated using a batch distribution coefficient (Kd) method and supported by a preliminary voltammetric study.
A. Chimedtsogzol   +13 more
core   +2 more sources

The unreasonable effectiveness of experiments in constraining nova nucleosynthesis [PDF]

open access: yes, 2013
Classical nova explosions arise from thermonuclear ignition in the envelopes of accreting white dwarfs in close binary star systems. Detailed observations of novae have stimulated numerous studies in theoretical astrophysics and experimental nuclear ...
Parikh, Anuj Ramesh
core   +1 more source

Removal of radioisotopes in solution and bactericidal/bacteriostatic sterilising power in activated carbon and metal silver filters [PDF]

open access: yesEnvironmental Toxicology and Pharmacology, 2009
Activated carbon filters play an important role in water filtration and purification from contaminants of different origin. Their limit consists in bacterial proliferation, which may occur only during prolonged periods of non-use and in their ability to remove radioactive contaminants present in waste water from Industry or Nuclear Medicine departments.
C. Maioli   +4 more
openaire   +2 more sources

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