Results 21 to 30 of about 1,572,221 (316)

Evolution Of Galaxies .2. Chemical Evolution Coefficients [PDF]

, 1973
NSF GP-18355, GP ...
Arnett, W. David, Talbot, Raymond. J.
core   +1 more source

Chemical evolution of low mass disc galaxies [PDF]

, 1999
We show that the multiphase chemical evolution model reproduces the correlations obtained along the spiral sequence, dwarf galaxies included. However the apparent spatial chemical uniformity observed in some irregular galaxies cannot be reproduced with ...
M. Mollá, Jean-René Roy
openalex   +4 more sources

Some Terpenes and Related Derivatives Synthesized in Cold Plasma Systems

Molecules, 1997
The synthesis of bicyclo-[2.2.1]-heptane and bicyclo-[7.2.0]-undec-4-ene derivatives under cold plasma conditions are reported. The reaction systems involve gaseous mixtures at an interface with ice surfaces.
Cristofor I. Simionescu, Gheorghe Cobileac, Constantin Romanescu, Sorin Manolache   +3 more
doaj   +1 more source

Chemical Evolution of Galaxies [PDF]

Publications of the Astronomical Society of the Pacific, 1979
SUMMARYThis paper discusses the initial mass function, the oxygen yield and the helium abundance in irregular and blue compact galaxies.
openaire   +4 more sources

THE APPEARANCE OF LIFE [PDF]

Filozofia i Nauka
The article presents the hypothesis of the origin of life. All the basic ideas of the 20th century research program in this area can be found there: the extrapolation of Darwinism into the area of chemical evolution, the influence of solar energy, the ...
Richard Krzymowski
doaj   +1 more source

Geochemical evolution of saline formation water of the Mozduran gas reservoir [PDF]

Journal of Stratigraphy and Sedimentology Researches, 2018
The Mozduran gas reservoir in the Khangiran gas-field is formed in the Kopet-Dagh sedimentary basin in the form of sequential sequences of clastic and carbonate sediments of the old sea water.
mahdi miri, Rahim Bagheri, Mohammad Reza Akhlaghi, Farzad Sotohian   +3 more
doaj   +1 more source

A High-Pressure, High-Temperature Flow Reactor Simulating the Hadean Earth Environment, with Application to the Pressure Dependence of the Cleavage of Avocado Viroid Hammerhead Ribozyme

Life, 2022
The RNA world hypothesis suggests that chemical networks consisting of functional RNA molecules could have constructed a primitive life-like system leading a first living system.
Kunio Kawamura, Mari Ogawa, Noriko Konagaya, Yoshimi Maruoka, Jean-François Lambert, Louis M. P. Ter-Ovanessian, Jacques Vergne, Guy Hervé, Marie-Christine Maurel   +8 more
doaj   +1 more source

Hypernova Nucleosynthesis and Galactic Chemical Evolution [PDF]

, 2001
We study nucleosynthesis in 'hypernovae', i.e., supernovae with very large explosion energies ($ \gsim 10^{52} $ ergs) for both spherical and aspherical explosions.
AI Macfadyen, AM Khokhlov, B Paczynski, C Sneden, D Argast, F-K Thielemann, G Nelemans, H Umeda, H Umeda, I Hachisu, I Hachisu, J Sollerman, K Iwamoto, K Iwamoto, K Iwamoto, K Maeda, K Maeda, K Nomoto, K Nomoto, K Nomoto, LAJ Blake, LM Germany, M Hashimoto, Nakamura, P Podsiadlowski, PA Mazzali, S Nagataki, SG Ryan, Shigeyama. T., amp Tsujimoto, T, TG Tsuru, V Bromm, WD Arnett, WN Brandt   +32 more
core   +2 more sources

Uncertainties in Galactic Chemical Evolution Models [PDF]

, 2016
We use a simple one-zone galactic chemical evolution model to quantify the uncertainties generated by the input parameters in numerical predictions for a galaxy with properties similar to those of the Milky Way.
Côté, Benoit, Fryer, Chris L., Herwig, Falk, Jones, Samuel, O’Shea, Brian W., Pignatari, Marco, Ritter, Christian   +6 more
core   +2 more sources

Reactions of Graphene Nano-Flakes in Materials Chemistry and Astrophysics

Physchem, 2022
The elucidation of the mechanism of the chemical evolution of the universe is one of the most important themes in astrophysics. Polycyclic aromatic hydrocarbons (PAHs) provide a two-dimensional reaction field in a three-dimensional interstellar space ...
Hiroto Tachikawa, Tetsuji Iyama
doaj   +1 more source