Results 41 to 50 of about 24,969 (196)
Hydrodynamic Modeling of the Interaction of Winds within a Collapsing Turbulent Gas Cloud
Advances in Astronomy, Volume 2015, Issue 1, 2015., 2015 By using the particle‐based code Gadget2, we follow the evolution of a gas giant molecular cloud, in which a set of gas particles representing the wind are created by a Monte Carlo scheme and suddenly move outwards from the cloud’s center. The particles representing the gas cloud initially have a velocity according to a turbulent spectrum built in a ...
Guillermo Arreaga-García +2 more
wiley +1 more source
Physicochemical Constraints on the Abiotic Polymerization of Nucleotides Into RNA
Journal of Geophysical Research: Biogeosciences, Volume 130, Issue 11, November 2025.Abstract One of the key steps in the origin of life is the polymerization of nucleotides into nucleic acids like RNA. We have quantified the energetic impact of temperature, pressure, and composition on the polymerization of nucleotides into RNA using the Gibbs function. These Gibbs energies have been used to calculate the probability that a nucleotide
D. E. LaRowe, J. M. Dick
wiley +1 more source
A Hydrodynamical Model of a Rotating Wind Source and Its Effects on the Collapse of a Rotating Core
Advances in Astronomy, Volume 2015, Issue 1, 2015., 2015 This work presents three‐dimensional hydrodynamical simulations with the fully parallel GAGDET2 code, to model a rotating source that emits wind in order to study the subsequent dynamics of the wind in three independent scenarios. In the first scenario we consider several models of the wind source, which is characterized by a rotation velocity Vrot and
Guillermo Arreaga-Garcia +1 more
wiley +1 more source
Gas dynamics in Massive Dense Cores in Cygnus-X [PDF]
, 2010 We study the kinematic properties of dense gas surrounding massive protostars recognized by Bontemps et a. (2010) in a sample of five Massive Dense Cores in Cygnus-X.
Bontemps, S. +4 more
core +3 more sources
Rotational Spectroscopy of the Acetone‐Water Complex: Large Amplitude Motions
ChemPhysChem, Volume 25, Issue 21, November 4, 2024.The structure and dynamics of the acetone‐water complex were explored using jet‐cooled rotational spectroscopy and computational chemistry calculations. Our detailed rot‐tunneling analyses of acetone‐H2O and −D2O revealed that the interaction with water disrupts the equivalence of the two methyl rotors, resulting in a significantly lower methyl rotor ...
Jiao Gao +4 more
wiley +1 more source
The Natural Science Underlying Big History
The Scientific World Journal, Volume 2014, Issue 1, 2014., 2014 Nature’s many varied complex systems—including galaxies, stars, planets, life, and society—are islands of order within the increasingly disordered Universe. All organized systems are subject to physical, biological, or cultural evolution, which together comprise the grander interdisciplinary subject of cosmic evolution.
Eric J. Chaisson, Lukas Kratochvil
wiley +1 more source
Star formation in Perseus. IV. Mass dependent evolution of dense cores [PDF]
, 2008 In our SCUBA survey of Perseus, we find that the fraction of protostellar cores increases towards higher masses and the most massive cores are all protostellar.
Fuller, Gary, Hatchell, Jennifer
core +3 more sources
Formation of Methanol via Fischer‐Tropsch Catalysis by Cosmic Iron Sulphide
ChemPhysChem, Volume 25, Issue 17, September 2, 2024.Periodic quantum mechanical simulations evidence the potentiality to synthesise methanol through a Fischer‐Tropsch mechanism in different astrophysical environments facilitated by the catalytic properties of cosmic FeS grains, which are enhanced by the presence of naturally‐occurring point surface defects.
Berta Martinez‐Bachs +3 more
wiley +1 more source
Anomalous Microwave Emission from Star Forming Regions
Advances in Astronomy, Volume 2013, Issue 1, 2013., 2013 The evidence for microwave emission from spinning dust grains has been strengthened considerably by its detection in a number of discrete astrophysical objects associated with star formation. These detections, in combination with statistical constraints on its presence on large angular scales in the diffuse ISM, have provided strong observational ...
Anna M. M. Scaife, Laurent Verstraete
wiley +1 more source
Characterizing Magnetic Properties of Young Protostars in Orion
The Astrophysical JournalThe B -field Orion Protostellar Survey (BOPS) recently obtained polarimetric observations at 870 μ m toward 61 protostars in the Orion molecular clouds with ∼1″ spatial resolution using the Atacama Large Millimeter/submillimeter Array.
Bo Huang +17 more
doaj +1 more source