Results 71 to 80 of about 167,251 (265)
Advanced Synthesis &Catalysis, EarlyView.In the presence of a Pd0 catalyst, large π‐extended arynes trimerize in an unusual manner to forge extremely compact and strained chiral benzenoids. This new trimerization reaction involves a 1,7‐Pd isomerization, a rare and poorly understood process that is elucidated.
Albert Artigas +6 more
wiley +1 more source
Supernova Dust Evolution Probed by Deep-sea 60Fe Time History
The Astrophysical Journal, 2023 There is a wealth of data on live, undecayed ^60 Fe ( t _1/2 = 2.6 Myr) in deep-sea deposits, the lunar regolith, cosmic rays, and Antarctic snow, which is interpreted as originating from the recent explosions of at least two near-Earth supernovae.
Adrienne F. Ertel +3 more
doaj +1 more source
Reacceleration of electrons in supernova remnants [PDF]
Proceedings of The 34th International Cosmic Ray Conference — PoS(ICRC2015), 2015 A&A submitted, version revised as per referee ...
Pohl, Manuela +2 more
openaire +7 more sources
A Supramolecular Material for Controlling Kiwifruit Bacterial Canker
Advanced Science, EarlyView.The matrine‐5‐methylsalicylic acid salt (MOS) is reported for its excellent antibacterial activity against Pseudomonas syringae pv. actinidiae (Psa), with advanced cell membrane penetration ability and strong affinities for potential targets. Furthermore, a nanosupramolecular delivery system MOS@hydroxypropyl‐beta‐cyclodextrin (HPCD) with improved ...
Xile Deng +9 more
wiley +1 more source
THE ORIGIN OF KEPLER'S SUPERNOVA REMNANT [PDF]
, 2012 It is now well established that Kepler's supernova remnant (SNR) is the result of a Type Ia explosion. With an age of 407 yr and an angular diameter of ∼4′, Kepler is estimated to be between 3.0 and 7.0 kpc distant.
D. Patnaude +5 more
semanticscholar +1 more source
Proton Acceleration with Relativistic Electromagnetic Shock
Advanced Science, EarlyView.New Ion Acceleration Mechanism! A novel cosmic‐ray proton acceleration mechanism is proposed, where relativistic electromagnetic shocks accelerate protons transversely. Hamiltonian analysis yields a scaling law linking the proton energy to the minimum longitudinal thickness of the shock.
Ting Xiao +5 more
wiley +1 more source
DUST IN A TYPE Ia SUPERNOVA PROGENITOR: SPITZER SPECTROSCOPY OF KEPLER'S SUPERNOVA REMNANT [PDF]
, 2012 Characterization of the relatively poorly understood progenitor systems of Type Ia supernovae is of great importance in astrophysics, particularly given the important cosmological role that these supernovae play. Kepler's supernova remnant, the result of
B. Williams +6 more
semanticscholar +1 more source
The infancy of supernova remnants: evolving a supernova into its remnant in 3D [PDF]
Proceedings of the International Astronomical Union, 2017 AbstractRecently, first neutrino-driven supernova explosions have been obtained in 3D, self-consistent, first-principle simulations, these models are still not always exploding robustly and, in general, the explosions are not sufficiently energetic. To constrain the explosion mechanism, and the related uncertainties, it is thus very helpful to consider
Michael Gabler +2 more
openaire +2 more sources
Organocatalytic C─O Bond Cleavage and Asymmetric Transformations via [1,3]‐Sigmatropic Rearrangement
Advanced Science, EarlyView.A direct asymmetric strategy for fulfilling the functional group transfer by aryl ether cleavage and migration is developed, representing the first Brønsted base‐catalyzed asymmetric [1,3]‐sigmatropic rearrangement reaction. The resulting chiral benzofuran products generated through this strategy exhibit significant 3D‐dimensionality and demonstrate ...
Lei Peng +7 more
wiley +1 more source
The Remnant of Supernova 1987A
, 2016 Although it has faded by a factor of ∼107, SN 1987A is still bright enough to be observed in almost every band of the electromagnetic spectrum. Today, the bolometric luminosity of the debris is dominated by a far-infrared (∼200μm) continuum from ∼0.5 M ...
R. McCray, C. Fransson
semanticscholar +1 more source