Results 31 to 40 of about 740,577 (309)

Everyday referenced use of a digital temperature sensor – how well do alternative ice cubes really cool a drink?

Chemistry Teacher International, 2023
In this paper, the cooling effect of alternative ice cubes made of granite, soapstone and ceramic is experimentally examined with the help of a digital temperature sensor and compared with that of a conventional ice cube.
Fleischer Timo, Feichtner Julia, Strauß Isabella, Strahl Alexander   +3 more
doaj   +1 more source

Dust temperature and time-dependent effects in the chemistry of photodissociation regions [PDF]

, 2019
When studying the chemistry of PDRs, time dependence becomes important as visual extinction increases, since certain chemical timescales are comparable to the cloud lifetime.
Caselli, Paola, Cazaux, Stephanie, Esplugues, Gisela, Hocuk, Seyit, Spaans, Marco   +4 more
core   +2 more sources

ICE CHEMISTRY IN STARLESS MOLECULAR CORES [PDF]

The Astrophysical Journal, 2015
Starless molecular cores are natural laboratories for interstellar molecular chemistry research. The chemistry of ices in such objects was investigated with a three-phase (gas, surface, and mantle) model. We considered the center part of five starless cores, with their physical conditions derived from observations. The ice chemistry of oxygen, nitrogen,
openaire   +2 more sources

Glaciochemistry of Cave Ice: Paradana and Snežna Caves, Slovenia

Geosciences, 2019
Cave ice samples collected within karstic terrain have major ion and nutrient concentrations showing that the ice originates from local precipitation modified by the addition of Ca2+ and HCO3− from the dissolution of the local bedrock.
Anne E. Carey, Matija Zorn, Jure Tičar, Matej Lipar, Blaž Komac, Susan A. Welch, Devin F. Smith, William Berry Lyons   +7 more
doaj   +1 more source

Variability in sea ice carbonate chemistry: a case study comparing the importance of ikaite precipitation, bottom-ice algae, and currents across an invisible polynya [PDF]

The Cryosphere, 2022
The carbonate chemistry of sea ice is known to play a role in global carbon cycles, but its importance is uncertain in part due to disparities in reported results.
B. G. T. Else, A. Cranch, R. P. Sims, R. P. Sims, S. Jones, L. A. Dalman, L. A. Dalman, C. J. Mundy, R. A. Segal, R. A. Segal, R. K. Scharien, T. Guha   +11 more
doaj   +1 more source

Photodissociation of water in crystalline ice: a molecular dynamics study [PDF]

, 2005
Ultraviolet irradiation of ice is of great interest for understanding the chemistry in both atmospheric and astrophysical environments. In interstellar space, photodissociation of H2O molecules can be a driving force behind the chemistry on icy dust ...
Al-Halabi, Allen, Aschi, Bartels, Bernal, Bursulaya, Chakarov, Chan, Chipman, Dobbyn, Ehrenfreund, Ewine F. van Dishoeck, Geert-Jan Kroes, Gerakines, Ghormley, Huber, Jorgensen, Khusnatdinov, Klein, Klán, Kobayashi, Langford, Larsen, Leto, Miller, Osted, Poulsen, Sander, Schinke, Stefan Andersson, Thomsen, van Harrevelt, van Harrevelt, Watanabe, Yabushita, Yang, Zhang   +36 more
core   +3 more sources

Ice chemistry on the Galilean satellites [PDF]

Journal of Geophysical Research: Planets, 1998
Jupiter's icy satellites Europa, Ganymede, and Callisto are subject to energy fluxes from electrons, photons, and magnetospheric plasma ion bombardment. As water ice and CO2 ice are thought to be present on their surfaces, the radiolysis of these materials over time should produce more complicated CHO‐containing molecules. These may include CH3OH, H2CO,
Mona L. Delitsky, Arthur L. Lane
openaire   +1 more source

Unraveling sulfur chemistry in interstellar carbon oxide ices

Nature Communications, 2022
AbstractFormyl radical (HCO•) and hydroxycarbonyl radical (HOCO•) are versatile building blocks in the formation of biorelevant complex organic molecules (COMs) in interstellar medium. Understanding the chemical pathways for the formation of HCO• and HOCO• starting with primordial substances (e.g., CO and CO2) is of vital importance in building the ...
Xiaolong Li, Bo Lu, Lina Wang, Junfei Xue, Bifeng Zhu, Tarek Trabelsi, Joseph S. Francisco, Xiaoqing Zeng   +7 more
openaire   +3 more sources

Ice core chemistry of Vestfonna Ice Cap in Svalbard, Norway [PDF]

Journal of Geophysical Research: Atmospheres, 2002
Chemical analyses were done on samples from a 2.2‐m deep snow pit and a 211‐m deep ice core that came from the top of the Vestfonna Ice Cap in Nordaustlandet, Svalbard, Norway. The snow pit samples showed that the temperature increased during the winter owing to advection of warm air from the south, and δ18O did not show a seasonal cycle. Chronology of
Sumito Matoba, Hideki Narita, Hideaki Motoyama, Kokichi Kamiyama, Okitsugu Watanabe   +4 more
openaire   +1 more source

Impact and implications of meltwater percolation on trace element records observed in a high-Alpine ice core

Journal of Glaciology, 2018
Past atmospheric pollution can be reconstructed from ice core trace element records retrieved from mountain glaciers. However, the current global temperature increase can result in post-depositional melt processes, significantly altering the originally ...
SVEN ERIK AVAK, MARGIT SCHWIKOWSKI, ANJA EICHLER   +2 more
doaj   +1 more source