Results 91 to 100 of about 1,887,037 (257)

The reactivation of water maser emission in the planetary nebula IRAS 18061--2505 through a born-again episode [PDF]

open access: green, 2021
L. F. Miranda   +14 more
openalex   +1 more source

Natural Hydrogen: A Mini‐Review Unveiling Its Potential as a Key to Sustainable Future for Energy

open access: yesEcoEnergy, Volume 3, Issue 4, December 2025.
This mini‐review summarizes natural hydrogen's formation mechanisms, exploration progress, and potential to drive global energy transition toward sustainability. ABSTRACT As the global energy shortage challenge and transition continues, greater attention is being drawn to natural hydrogen, a clean and high‐potential energy source.
Yuanming Gao   +14 more
wiley   +1 more source

Simulated synchrotron emission from pulsar wind nebulae [PDF]

open access: yesAstronomy & Astrophysics, 2006
A complete set of diagnostic tools aimed at producing synthetic synchrotron emissivity, polarization, and spectral index maps from relativistic MHD simulations is presented. As a first application we consider here the case of the emission from Pulsar Wind Nebulae (PWNe).
DEL ZANNA, LUCA   +3 more
openaire   +3 more sources

The impact of the nitrogen-to-oxygen ratio on ionized nebula diagnostics based on [N ii] emission lines [PDF]

open access: yes, 2009
We study the relation between nitrogen and oxygen abundances as a function of metallicity for a sample of emission-line objects for which a direct measurement of the metallicity has been possible.
E. Pérez-Montero, T. Contini
semanticscholar   +1 more source

Advancing Surgical Practice With Mixed Reality: Current Innovations and Future Prospects

open access: yesMedComm – Future Medicine, Volume 4, Issue 4, December 2025.
Mixed reality technology is realizing advanced virtual‐physical environment fusion with potential to apply in surgical practice. This review analyzes English‐language literature on mixed reality‐assisted surgery to summarize its technical frameworks and clinical applications, while evaluating its feasibility and clinical value, and discussing current ...
Yifan Ke, Kunpeng Hu
wiley   +1 more source

Discovery of Radial Spectral Hardening in the Hot Bubble of Planetary Nebula BD+30°3639 with Median Energy Imaging

open access: yesThe Astrophysical Journal
We apply an imaging analysis technique to study the spatial distribution of the X-ray spectral hardness across the hot bubble of planetary nebula BD+30°3639.
Rodolfo Montez Jr.
doaj   +1 more source

Evolution of Terrestrial Planetary Bodies and Implications for Habitability

open access: yesReviews of Geophysics, Volume 63, Issue 4, December 2025.
Abstract The terrestrial planetary bodies of our solar system—Mercury, Venus, Earth, and Mars—share a common origin through nebular accretion and early magma ocean differentiation, yet they diverged significantly in geological evolution, tectonic regimes, and habitability.
Peter A. Cawood   +4 more
wiley   +1 more source

The Qingzhen reaction, a fine‐grained mineral assemblage associated with djerfisherite in some EH3 chondrites: Alteration on the EH parent body

open access: yesMeteoritics &Planetary Science, Volume 60, Issue 12, Page 2913-2934, December 2025.
Abstract Enstatite chondrites formed under extremely reducing conditions in the protoplanetary disk. They are derived from two or more parent bodies, EH and EL, and both EH and EL groups contain petrologic type 3–6 samples. The rare lithophile‐ and halogen‐bearing sulfide, djerfisherite, occurs in low abundance in enstatite chondrites, most frequently ...
Peter Mc Ardle   +9 more
wiley   +1 more source

JWST/NIRCam Imaging of the Bipolar Planetary Nebula NGC 6537: The (Infra)red Spider, Revealed

open access: yesThe Astrophysical Journal
We present James Webb Space Telescope (JWST) Near-Infrared Camera (NIRCam) Br α , H _2 , [Fe ii ], and polycyclic aromatic hydrocarbon (PAH) imaging of the molecule-rich, high-excitation bipolar planetary nebula (PN) NGC 6537 (the Red Spider ...
Joel H. Kastner   +7 more
doaj   +1 more source

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