Results 51 to 60 of about 372,210 (210)

Absorption and scattering by interstellar dust in the silicon K-edge of GX 5-1 [PDF]

, 2016
Context. We study the absorption and scattering of X-ray radiation by interstellar dust particles, which allows us to access the physical and chemical properties of dust. The interstellar dust composition is not well understood, especially on the densest
S. Zeegers, E. Costantini, C. Vries, A. Tielens, H. Chihara, F. Groot, H. Mutschke, L. Waters, S. Sron, L. Observatory, O. University, Debye Institute for Nanomaterials Science, A. Jena, Uva, Naoj   +14 more
semanticscholar   +1 more source

Consequences of the Solar System passage through dense interstellar clouds [PDF]

Annales Geophysicae, 2003
Several consequences of the passage of the solar system through dense interstellar molecular clouds are discussed. These clouds, dense (more than 100 cm-3), cold (10–50 K) and extended (larger than 1 pc), are characterized by a gas-to-dust mass ...
A. G. Yeghikyan, A. G. Yeghikyan, H. J. Fahr   +2 more
doaj   +1 more source

Kinetics and Thermodynamics of Tautomerization Reactions of 1,1‐ and 1,2‐Ethenediols

International Journal of Chemical Kinetics, Volume 57, Issue 12, Page 687-696, December 2025.
ABSTRACT Tautomerism is a common phenomenon amongst organic molecules with easily interconvertible isomers, which can impact drug action and toxicity. Here we are interested in the enols of carboxylic acids, which are known to be much less stable than their acid counterparts.
Judith Würmel, John M. Simmie
wiley   +1 more source

Quantum mechanical modeling of interstellar molecules on cosmic dusts: H2O, NH3, and CO2

Frontiers in Chemistry, 2022
Since the first detection of CH molecule in interstellar medium (ISM), more than 270 molecules have been identified in various astronomical sources in ISM.
Fangfang Li, Fangfang Li, Donghui Quan, Donghui Quan, Xia Zhang, Xia Zhang, Xiaohu Li, Xiaohu Li, Jarken Esimbek, Jarken Esimbek   +9 more
doaj   +1 more source

A Comprehensive Review of Additive Manufacturing for Space Applications: Materials, Advances, Challenges, and Future Directions

Advanced Engineering Materials, Volume 27, Issue 22, November 2025.
Additive manufacturing (AM) transforms space hardware by enabling lightweight, high‐performance, and on‐demand production. This review outlines AM processes—powder bed fusion (PBF), directed energy deposition (DED), binder jetting (BJ), sheet lamination (SL), and material extrusion (ME)—applied to propulsion, satellite structures, and thermal devices ...
Stelios K. Georgantzinos, Eleni Papadopoulou, Grigorios Kostopoulos, Stefanos Voulgaris, Alexandra Tseni, Panteleimon Bakalis, Maria Gkara, Chara C. Mitropoulou, Nikos D. Lagaros   +8 more
wiley   +1 more source

SIXTEEN YEARS OF ULYSSES INTERSTELLAR DUST MEASUREMENTS IN THE SOLAR SYSTEM. I. MASS DISTRIBUTION AND GAS-TO-DUST MASS RATIO [PDF]

, 2015
In the early 1990s, contemporary interstellar dust penetrating deep into the heliosphere was identified with the in situ dust detector on board the Ulysses spacecraft. Between 1992 and the end of 2007 Ulysses monitored the interstellar dust stream.
H. Krüger, P. Strub, E. Gruen, V. Sterken   +3 more
semanticscholar   +1 more source

Quasi‐Thermal Noise Spectroscopy in Magnetized Space Plasma: Analysis of Wind/WAVES Measurements in Earth's Magnetosphere

Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.
Abstract Quasi‐thermal noise is measured by an electric antenna embedded in a plasma, and is routinely used to obtain a diagnostic of, for example, the plasma density and electron temperature. Its applications have been so far to a large extent aimed at the analysis of unmagnetized plasmas, for which the plasma‐electron cyclotron frequencies ratio is ...
P. Dazzi, K. Issautier, P. Henri, B. Verkampt   +3 more
wiley   +1 more source

SIXTEEN YEARS OF ULYSSES INTERSTELLAR DUST MEASUREMENTS IN THE SOLAR SYSTEM. II. FLUCTUATIONS IN THE DUST FLOW FROM THE DATA [PDF]

, 2015
The Ulysses spacecraft provided the first opportunity to identify and study interstellar dust (ISD) in situ in the solar system between 1992 and 2007. Here we present the first comprehensive analysis of the ISD component in the entire Ulysses dust data ...
P. Strub, H. Krüger, V. Sterken
semanticscholar   +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

DESTRUCTION OF INTERSTELLAR DUST IN EVOLVING SUPERNOVA REMNANT SHOCK WAVES [PDF]

, 2015
Supernova generated shock waves are responsible for most of the destruction of dust grains in the interstellar medium (ISM). Calculations of the dust destruction timescale have so far been carried out using plane parallel steady shocks, however, that ...
J. Slavin, E. Dwek, A. Jones
semanticscholar   +1 more source