Results 31 to 40 of about 49,325 (179)

Recent Advances in the Domain of Cyclic (Alkyl)(Amino) Carbenes

Chemistry – An Asian Journal, Volume 17, Issue 7, April 1, 2022., 2022
The present review highlights recent developments in the domain of cyclic (alkyl) (amino) carbenes with the emphasis on their applications in the field of catalysis, activation of small molecules, radical chemistry, organic light‐emitting diodes (OLEDs), medicinal chemistry, and single‐molecule magnets (SMMs). Abstract Isolation of cyclic (alkyl) amino
Saroj Kumar Kushvaha, Ankush Mishra, Herbert W. Roesky, Kartik Chandra Mondal   +3 more
wiley   +1 more source

Dust absorption and scattering in the silicon K-edge [PDF]

, 2019
The composition and properties of interstellar silicate dust are not well understood. In X-rays, interstellar dust can be studied in detail by making use of the fine structure features in the Si K-edge.
Costantini, E., de Groot, F., de Vries, C. P., Mohr, P., Mutschke, H., Rogantini, D., Tielens, A. G. G. M., Zeegers, S. T.   +7 more
core   +3 more sources

Supernova Rates and Burial of Organic Matter

Geophysical Research Letters, Volume 49, Issue 1, 16 January 2022., 2022
Abstract Life on Earth appears to have evolved under the influence of supernovae activity in the solar neighborhood. Supernovae frequency regulates the flux of cosmic ray particles arriving at the top of the Earth's atmosphere, where empirical evidence supports a close connection between cosmic rays, clouds, and climate.
Henrik Svensmark
wiley   +1 more source

Laboratory exploration of mineral precipitates from Europa's subsurface ocean

Journal of Applied Crystallography, Volume 54, Issue 5, Page 1455-1479, October 2021., 2021
Precipitation experiments from a model Europan ocean solution subjected to fast and slow freezing suggest that the highly hydrated Na–Mg sulfate phase Na2Mg(SO4)2·16H2O is one of the lowest‐temperature mineral phases likely to be stable on Europa's surface and may therefore be astrobiologically significant.The precipitation of hydrated phases from a ...
Stephen P. Thompson, Hilary Kennedy, Benjamin M. Butler, Sarah J. Day, Emmal Safi, Aneurin Evans   +5 more
wiley   +1 more source

Four‐dimensional relativistic scattering of electromagnetic waves from an arbitrary collection of moving lossy dielectric spheres

IET Microwaves, Antennas &Propagation, Volume 15, Issue 2, Page 180-191, 5 February 2021., 2021
Abstract Four‐dimensional (4D) relativistic scattering of electromagnetic waves from an arbitrary collection of uniformly translational moving lossy dielectric spheres is discussed. Two reference frames, four 4D coordinate systems and Lorentz transformation are used to obtain the scattered electromagnetic fields.
Hamed Radpour, Ali Pourziad, Kamal Sarabandi   +2 more
wiley   +1 more source

Detection of PAH Absorption and Determination of the Mid-infrared Diffuse Interstellar Extinction Curve from the Sight Line toward Cyg OB2-12 [PDF]

Astrophysical Journal, 2020
The sight line toward the luminous blue hypergiant Cyg OB2-12 is widely used to study interstellar dust on account of its large extinction (AV ≃ 10 mag) and the fact that this extinction appears to be dominated by dust typical of the diffuse interstellar
B. Hensley, B. Draine
semanticscholar   +1 more source

An imaging polarimetry survey of Type Ia supernovae: are peculiar extinction and polarization properties produced by circumstellar or interstellar matter? [PDF]

, 2021
Some highly reddened Type Ia supernovae (SNe Ia) display low total-to-selective extinction ratios ($R_V \lesssim 2$) in comparison to that of typical Milky Way dust ($R_V \approx 3.3$), and polarization curves that rise steeply to blue wavelengths, with ...
Matthew R. Chu, A. Cikota, D. Baade, F. Patat, A. Filippenko, J. Wheeler, J. Maund, M. Bulla, Yi Yang, P. Hoflich, Lifan Wang   +10 more
semanticscholar   +1 more source

THEMIS 2.0: A self-consistent model for dust extinction, emission, and polarisation [PDF]

Astronomy & Astrophysics
Recent observational constraints in emission, extinction, and polarisation have at least partially invalidated most of the astronomical standard grain models for the diffuse interstellar medium.
N. Ysard, A. Jones, V. Guillet, K. Demyk, M. Decleir, L. Verstraete, Ilyes Choubani, M. Miville-Deschênes, L. Fanciullo   +8 more
semanticscholar   +1 more source

Interstellar Silicon Depletion and the Ultraviolet Extinction [PDF]

, 2017
Spinning small silicate grains were recently invoked to account for the Galactic foreground anomalous microwave emission. These grains, if present, will absorb starlight in the far ultraviolet (UV).
Li, Aigen, Mishra, Ajay
core   +3 more sources

Three-dimensional Distribution of the Interstellar Dust in the Milky Way [PDF]

, 2020
We present a three-dimensional (3D) extinction map of the southern sky. The map covers the SkyMapper Southern Survey (SMSS) area of ∼14,000 deg2 and has spatial resolutions between 6.′9 and 27′.
H.-L. Guo, B.-Q. Chen, H.-B. Yuan, Y. Huang, D. Liu, Y. Yang, X.-Y. Li, W.-X. Sun, X.-W. Liu   +8 more
semanticscholar   +1 more source