Results 51 to 60 of about 17,275 (278)

OT 060420: A Seemingly Optical Transient Recorded by All-Sky Cameras [PDF]

, 2006
We report on a ~5th magnitude flash detected for approximately 10 minutes by two CONCAM all-sky cameras located in Cerro Pachon - Chile and La Palma - Spain. A third all-sky camera, located in Cerro Paranal - Chile did not detect the flash, and therefore
Arter T. R., Lindley D., Lior Shamir, McBeath A., McBeath A., Menzies J. W., Pereira W. E., Rafert J. B., Robert J. Nemiroff, Shamir L., Shamir L., Spurny P.   +11 more
core   +3 more sources

Does Palsa Thaw in Northern Finland Contribute to Remobilisation of Metals Accumulated in Peat Into Surface Waters?

Land Degradation &Development, EarlyView.
ABSTRACT Permafrost is rapidly degrading in the sporadic zone, including palsa mires in Scandinavia. Peatlands in the area have likely accumulated heavy metals from atmospheric deposition of industrial contaminants in the wider region. As the palsa mire chemical composition is not well known, and in other permafrost regions the permafrost thaw may ...
Joanna Katarzyna Jóźwik, Krystyna Kozioł, Marcin Frankowski, Marta Jakubiak, Kamil Nowiński, Mariusz Jędrysek, Danuta Szumińska, Żaneta Polkowska   +7 more
wiley   +1 more source

Cryostratigraphy of Rhythmic Segregated Ice in Colluvium and Implications for Permafrost Slope Stability

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT The amount and stratigraphic setting of ground ice in permafrost slopes is a key control on the style and magnitude of permafrost mass wasting. Understanding the spatial and stratigraphic variations in ground ice distribution on permafrost slopes is therefore a fundamental property in assessing the stability of permafrost hillslopes.
Joseph M. Young, Alejandro Alvarez, Duane Froese   +2 more
wiley   +1 more source

Meteor Statistics. I. The Distribution of Instrumental Magnitudes

The Astronomical Journal
The distribution of meteor magnitudes is known to follow an exponential distribution, where the base of this distribution is called the population index.
Althea V. Moorhead, Peter G. Brown, Margaret D. Campbell-Brown, Michael J. Mazur, Denis Vida   +4 more
doaj   +1 more source

Mass Loss Due to Sputtering and Thermal Processes in Meteoroid Ablation

, 2005
Conventional meteoroid theory assumes that the dominant mode of ablation is by evaporation following intense heating during atmospheric flight. In this paper we consider the question of whether sputtering may provide an alternative disintegration process
Adolfsson, Almen, Anderson, Barlow, Bellot Rubio, Bohdansky, Bohdansky, Borovicka, Bronshten, Campbell, Ceplecha, Coulson, Coulson, Draine, Draine, Elford, Ellyett, Ellyett, Fisher, Fujiwara, Fyfe, Hawkes, Hawkes, Hedin, Hedin, Jacchia, Janches, Jones, Jurac, K.A. Hill, L.A. Rogers, Lebedinets, LeBlanc, Matsunami, McKinley, Molchanov, Nicol, R.L. Hawkes, Simek, Spurny, Spurny, Steel, Tielens, Verniani, von Zahn, Öpik   +45 more
core   +1 more source

Key Technical Fields and Future Outlooks of Space Manipulators: A Survey

SmartBot, EarlyView.
This paper systematically reviews the technological development of space manipulators, emphasizing the unique challenges posed by space environments. It examines four areas: structural design, modeling, planning, and control, while introducing typical ground test platforms.
Gang Chen, Zeyuan Huang, Ying Yan, Xiaokang An, Zhikai Zhao, Jirong Lin, Xiangrong Zhao, Xianyuan Gao, Junyi Zong, Xuewen Jia, Zhipeng Yao, Jianliang Liao, Ning Ji   +12 more
wiley   +1 more source

A Curated Dataset of Regional Meteor Events with Simultaneous Optical and Infrasound Observations (2006–2011)

Data
We present a curated, openly accessible dataset of 71 regional meteor events simultaneously recorded by optical and infrasound instrumentation between 2006 and 2011. These events were captured during an observational campaign using the all-sky cameras of
Elizabeth A. Silber, Emerson Brown, Andrea R. Thompson, Vedant Sawal   +3 more
doaj   +1 more source

Radar and optical leonids [PDF]

Atmospheric Chemistry and Physics, 2004
We present joint optical-radar observations of meteors collected near the peak of the Leonid activity in 2002. We show four examples of joint detections with a large, phased array L-band radar and with intensified video cameras.
N. Brosch, D. Polishook, R. Helled, S. Schijvarg, M. Rosenkrantz   +4 more
doaj  

Resource reallocation across successive systemic innovations: How Rolls‐Royce shaped the evolution of the turbojet, turboprop, and turbofan

Strategic Management Journal, EarlyView.
Abstract Research Summary Despite the importance of resource reallocation in shaping a variety of strategic outcomes, strategy scholars have paid only limited attention to the processes by which firms reallocate their resources across successive systemic innovations.
Gino Cattani, Mariano Mastrogiorgio, Giuseppe Carignani   +2 more
wiley   +1 more source

Seeding the Solar System with Life: Mars, Venus, Earth, Moon, Protoplanets

Open Astronomy, 2020
In the space of the entire universe, the only conclusive evidence of life, is found on Earth. Although the ultimate source of all life is unknown, many investigators believe Earth, Mars, and Venus may have been seeded with life when these planets, and ...
Joseph Rhawn G., Planchon Olivier, Gibson Carl H., Schild Rudolph   +3 more
doaj   +1 more source