Results 41 to 50 of about 549,888 (271)

Remarks on the deuterium excess in precipitation in cold regions [PDF]

Tellus B: Chemical and Physical Meteorology, 1991
Jouzel and Merlivat developed and used an expression for the kinetic fractionation coefficient α k , and greatly improved the predictions of δ ( 18 O) and d (the deuterium excess) for East Antarctica. The α k coefficient is re-derived in terms of ambient cloud temperatures and is used to re-calculate their single-source East Antarctic ...
openaire   +1 more source

Deuterium excess in Greenland snow: Analysis with simple and complex models [PDF]

Journal of Geophysical Research: Atmospheres, 1998
A simple Rayleigh‐type isotope model, typical of those used to develop algorithms for extracting climatic information from stable water isotope paleodata, is evaluated against the more complex and presumably more reliable calculations of a general circulation model (GCM) fitted with isotope tracer diagnostics.
Armengaud, Alexandre, Koster, Randal, Jouzel, Jean, Ciais, Philippe   +3 more
openaire   +3 more sources

(Fig. 7) Stable oxygen isotopes and deuterium excess of ice core VF79_core2 from the Vernagtferner

, 1982
(Fig.
Willibald Stichler (2411932), Stichler, Willibald, Daniel Baker (45860), Hans Oerter (6885401), Peter Trimborn (6981155), Trimborn, Peter, Baker, Daniel, Oerter, Hans   +7 more
core   +1 more source

Cryogenic Deformation Behavior of TiAl and Insights Into Embrittlement After High‐Temperature Exposure Combined With Secondary Ion Mass Spectroscopy of Near Surface Chemistry

Advanced Engineering Materials, EarlyView.
Near‐surface deuterium enrichment profiles for different microstructural types of TiAl after exposure at 700 °C in a heavy water‐containing environment. The deuterium levels are significantly higher than expected from natural occurrence, indicating that the heavy water dissociated during the exposure treatment and entered the specimens.
Jonathan D. H. Paul, Alexander Welle, Dirk Matthiessen, Michael Oehring, Fritz Appel, Florian Pyczak   +5 more
wiley   +1 more source

Cancer, deuterium, and gut microbes: A novel perspective

Endocrine and Metabolic Science
Deuterium is a natural isotope of hydrogen, containing a neutron as well as a proton, which makes it twice as heavy as hydrogen. In this paper, we develop a theoretical argument that human metabolism strives to minimize the amount of deuterium in ...
Stephanie Seneff, Anthony M. Kyriakopoulos   +1 more
doaj   +1 more source

Nonequilibrium Fractionation During Ice Cloud Formation in iCAM5: Evaluating the Common Parameterization of Supersaturation as a Linear Function of Temperature

Journal of Advances in Modeling Earth Systems, 2019
Supersaturation with respect to ice determines the strength of nonequilibrium fractionation during vapor deposition onto ice or snow and therefore influences the water isotopic composition of vapor and precipitation in cold environments.
Marina Dütsch, Peter N. Blossey, Eric J. Steig, Jesse M. Nusbaumer   +3 more
doaj   +1 more source

Continuous monitoring of summer surface water vapor isotopic composition above the Greenland Ice Sheet [PDF]

Atmospheric Chemistry and Physics, 2013
We present here surface water vapor isotopic measurements conducted from June to August 2010 at the NEEM (North Greenland Eemian Drilling Project) camp, NW Greenland (77.45° N, 51.05° W, 2484 m a.s.l.).
H. C. Steen-Larsen, S. J. Johnsen, V. Masson-Delmotte, B. Stenni, C. Risi, H. Sodemann, D. Balslev-Clausen, T. Blunier, D. Dahl-Jensen, M. D. Ellehøj, S. Falourd, A. Grindsted, V. Gkinis, J. Jouzel, T. Popp, S. Sheldon, S. B. Simonsen, J. Sjolte, J. P. Steffensen, P. Sperlich, A. E. Sveinbjörnsdóttir, B. M. Vinther, J. W. C. White   +22 more
doaj   +1 more source

CO2‐to‐CO Conversion in a Gas‐Fed, Zero‐Gap, PEM Electrolyzer Enabled by Polycations and Nitrogen‐Doped Carbon‐Supported Cobalt Nanoparticles

Advanced Functional Materials, EarlyView.
A gas‐fed, zero‐gap, PEM CO2 electrolyzer is realized by incorporating PDDA+ ions onto the carbonaceous Co/N‐C electrocatalyst, with gaseous H2 and CO2 fed into the anode and cathode, respectively. Operating without an aqueous electrolyte, the system sustains a peak FECO of 65.1% at 100 mA cm−2. ABSTRACT Electrochemical carbon dioxide reduction (ECO2R)
Yuen Leong Chow, Hsi‐Wen Wu, Aimin Li, Yalou Guo, Duhong Chen, Jie Zhang, Paul A. Webley   +6 more
wiley   +1 more source

Applicability study of deuterium excess in bottled water life cycle analyses

Geologija, 2014
Paper explores the possible use of d‑excess in the investigation of bottled water. Based on the data set from Brencic and Vreca’s paper (2006). Identification of sources and production processes of bottled waters by stable hydrogen and oxygen isotope ...
Mihael Brenčič, Polona Vreča
doaj   +1 more source

A New Bioactive Glass‐Based Hybrid Bioink With Enhanced Cell Viability and Antibacterial Properties

Advanced Healthcare Materials, EarlyView.
Graphical illustration of the production and characterization process, demonstrating the multiple functions of the new hybrid gelatin methacryloyl‐silver‐bioactive glass (GAB) material. Created in https://BioRender.com. ABSTRACT Recent advances in three‐dimensional bioprinting (3DBP) technology enable the production of customized bone substitutes ...
Adam C. Marsh, Ehsanul Hoque Apu, Theofania Kleisoura, Romila Manchanda, Valerie Johnson, Ginger Ross, Ioannis Tsamesidis, Eleana Kontonasaki, DeMarcus Bunn, Ahmet Erdem, Neal D. Hammer, Kurt D. Hankenson, Christopher H. Contag, Nureddin Ashammakhi, Xanthippi Chatzistavrou   +14 more
wiley   +1 more source