Results 71 to 80 of about 399,927 (153)

Hydroxyl as a Tracer of H2 in the Envelope of MBM40

, 2012
We observed 51 positions in the OH 1667 MHz main line transitions in the translucent, high latitude cloud MBM40. We detected OH emission in 8 out of 8 positions in the molecular core of the cloud and 24 out of 43 in the surrounding, lower extinction ...
Blitz, Chastain, Chastain, Chastain, Cox, David L. Cotten, deVries, Douglas, Elizabeth A. Wennerstrom, Goldsmith, Grossman, Harju, Hearty, Ingalls, Joseph S. Onello, Kevin A. Douglas, LaValley, Liszt, Loris Magnani, Maddalena, McGehee, Miville-Deschênes, Nercessian, Schlegel, Shore, van Dishoeck, Viala, Wennerstrom, Wouterloot   +28 more
core   +1 more source

The last dinosaurs of Brazil: The Bauru Group and its implications for the end-Cretaceous mass extinction

Anais da Academia Brasileira de Ciências
The non-avian dinosaurs died out at the end of the Cretaceous, ~66 million years ago, after an asteroid impact. The prevailing hypothesis is that the effects of the impact suddenly killed the dinosaurs, but the poor fossil record of latest Cretaceous ...
STEPHEN L. BRUSATTE, CARLOS R.A. CANDEIRO, FELIPE M. SIMBRAS   +2 more
doaj   +1 more source

Re-ignition of multi-species soot clouds in building fires

Reaktor, 2017
The re-ignition potential of multi-species soot clouds in building fires were investigated  based on their extinction characteristics. The investigation was carried out theoretically using the adaptation of Semenov`s thermal explotion theory.
T. Poespowati, B. Moghtaderi
doaj   +1 more source

Large mass-independent sulphur isotope anomalies link stratospheric volcanism to the Late Ordovician mass extinction

Nature Communications, 2020
Identification of stratospheric volcanic eruptions in the geological record and their link to mass extinction events during the past 540 million years remains challenging.
Dongping Hu, Menghan Li, Xiaolin Zhang, Alexandra V. Turchyn, Yizhe Gong, Yanan Shen   +5 more
doaj   +1 more source

Predicting dust extinction properties of star-forming galaxies from H-alpha/UV ratio

, 2015
Using star-forming galaxies sample in the nearby Universe (0 ...
Egusa, Fumi, Hayashi, Masao, Kodama, Tadayuki, Koyama, Yusei, Makiuti, Sin'itirou, Oi, Nagisa, Shimakawa, Rhythm, Tadaki, Ken-ichi, Takita, Satoshi, Tanaka, Ichi, Yamamura, Issei   +10 more
core   +1 more source

Thermal and nutrient stress drove Permian–Triassic shallow marine extinctions

Cambridge Prisms: Extinction
The Permian–Triassic climate crisis can provide key insights into the potential impact of horizon threats to modern-day biodiversity. This crisis coincides with the same extensive environmental changes that threaten modern marine ecosystems (i.e ...
William J. Foster, Anja B. Frank, Qijian Li, Silvia Danise, Xia Wang, Jörn Peckmann   +5 more
doaj   +1 more source

Extended period of K/T boundary mass extinction in the marine realm [PDF]

The Cretaceous/Tertiary (K/T) boundary mass extinction has been widely recognized as a nearly instantaneous catastrophy among marine plankton such as foraminifera. However, the suddenness of this extinction event may have been overemphasized because most
Keller, G.
core   +1 more source

A detailed study of the enigmatic cluster M82F

, 2007
We present a detailed study of the stellar cluster M82F, using multi-band high resolution HST imaging and deep ground based optical slit and integral field spectroscopy.
G. Trancho, I. Konstantopoulos, J. S. Gallagher, Kroupa, L. J. Smith, M. S. Westmoquette, N. Bastian   +6 more
core   +1 more source

The impact of mass extinctions [PDF]

In the years since Snowbird an explosive growth of research on the patterns, causes, and consequences of extinction was seen. The fossil record of extinction is better known, stratigraphic sections were scrutinized in great detail, and additional markers
Flessa, Karl W.
core   +1 more source

Distribution and characteristics of Infrared Dark Clouds using genetic forward modelling

, 2009
Infrared Dark Clouds (IRDCs) are dark clouds seen in silhouette in mid-infrared surveys. They are thought to be the birthplace of massive stars, yet remarkably little information exists on the properties of the population as a whole (e.g.
A. P. Jones, Allen, Alves, Benjamin, Binney, Brunthaler, Cambrésy, Chambers, D. J. Marshall, Dame, Egan, G. Joncas, Gerhard, Gómez, Hennebelle, Indebetouw, Jackson, Perault, Press, Rathborne, Rathborne, Simon, Simon, Skrutskie, Vallée, Zhang   +25 more
core   +1 more source