Results 21 to 30 of about 102,546 (215)

High‐Pressure Carbonaceous Phases as Minerals

open access: yesGeophysical Monograph Series, Page 11-23., 2020

This book is Open Access. A digital copy can be downloaded for free from Wiley Online Library.

Explores the behavior of carbon in minerals, melts, and fluids under extreme conditions

Carbon trapped in diamonds and carbonate-bearing rocks in subduction zones are examples of the continuing exchange of substantial carbon ...
Oliver Tschauner
wiley  

+1 more source

The galactic environment of the Sun [PDF]

open access: yes, 1999
The interstellar cloud surrounding the solar system regulates the galactic environment of the Sun and constrains the physical characteristics of the interplanetary medium.
Frisch, P. C.
core   +3 more sources

Supersonic turbulence and structure of interstellar molecular clouds [PDF]

open access: yes, 2002
The interstellar medium (ISM) provides a unique laboratory for highly supersonic, driven hydrodynamics turbulence. We present a theory of such turbulence, confirm it by numerical simulations, and use the results to explain observational properties of ...
B. Dubrulle   +28 more
core   +2 more sources

Rubidium in the Interstellar Medium [PDF]

open access: yes, 2009
We present observations of interstellar rubidium toward o Per, zeta Per, AE Aur, HD 147889, chi Oph, zeta Oph, and 20 Aql. Theory suggests that stable 85Rb and long-lived 87Rb are produced predominantly by high-mass stars, through a combination of the ...
Abia   +28 more
core   +2 more sources

Variability of GRB Afterglows Due to Interstellar Turbulence [PDF]

open access: yes, 1999
Gamma-Ray Burst (GRB) afterglows are commonly interpreted as synchrotron emission from a relativistic blast wave produced by a point explosion in an ambient medium, plausibly the interstellar medium of galaxies.
Abraham Loeb   +3 more
core   +2 more sources

Search for thermonuclear burst oscillations in the Swift/BAT data set

open access: yesFrontiers in Astronomy and Space Sciences
This study comprehensively analyzes type I X-ray bursts observed by Swift/BAT from 2005 to April 2024 to search for X-ray burst oscillations (XBOs) in neutron star low-mass X-ray binaries.
Qing-Xin Li   +5 more
doaj   +1 more source

Deep Learning–driven Atmospheric Parameter Prediction for Hot Subdwarf Stars with Synthetic and Observed Spectra

open access: yesThe Astrophysical Journal Supplement Series
We design a convolutional neural network incorporating channel attention and spatial attention mechanisms to predict atmospheric parameters of hot subdwarfs.
Zhenxin Lei   +6 more
doaj   +1 more source

STELLA—Potential European contributions to a NASA-led interstellar probe

open access: yesFrontiers in Astronomy and Space Sciences, 2022
The discovery of a myriad of exoplanets in the past decades has revolutionized the understanding of our place in the Universe. How different are exoplants and do some of them harbor life, just like Earth? To do so, their parent stars must drive a stellar
Robert F. Wimmer-Schweingruber   +12 more
doaj   +1 more source

Fragmentation Pathways of Diaminomaleonitrile: Automated Discovery and High-Level Energetics Under Laser-Driven Conditions. [PDF]

open access: yesChemphyschem
Laser irradiation of a 2,3‐diaminomaleonitrile (DAMN) molecule (white) induces decomposition into the highlighted products (yellow). The laptop denotes a computational simulation designed to mimic the laser ablation experiment. We investigate the fragmentation chemistry of 2,3‐diaminomaleonitrile (DAMN), a key hydrogen cyanide (HCN) tetramer in ...
Reis MC, Ramos AF.
europepmc   +2 more sources

Synthesis of Conjugated Linear and Cyclic Polyynes by Selective Alkyne Metathesis

open access: yesAngewandte Chemie International Edition, EarlyView.
The formation of polyynes with an odd number of conjugated triple bonds is challenging, particularly for complex architectures since most established methods rely on irreversible C–C bond‐forming reactions. To address this, we have developed the synthesis of triynes via alkyne metathesis.
Julien Escudero   +12 more
wiley   +1 more source

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