Results 111 to 120 of about 17,365 (298)

Design and implementation of on-board high reliability FPGA on-orbit reconfiguration

Measurement + Control
The electronic system of the multi-chip combined control architecture satellites often requires an on-orbit reconfiguration capability for field programmable gate arrays (FPGAs). The purpose is to provide program backup and rapid on-orbit reconfiguration
Longkun Yu, Shuai Yang, Xiangyang Wen, Jiacong Liu, Jiarong Yan, Xinqiao Li, Shaolin Xiong, Zhigang Lu, Ke Gong, Yaqing Liu, Zhenghua An, Dali Zhang, Xiaojing Liu, Xiaoyun Zhao, Fan Zhang, Jinzhou Wang, Min Gao, Yanbing Xu, Xilei Sun, Hui Wang, Chao Zheng, Peiyi Feng, Chenwei Wang, Yanqiu Zhang, Peng Zhang, Zhiqiang Ding, Yongye Li, Chenxing Zhang, Jing Wang, Li Chen   +29 more
doaj   +1 more source

High-resolution X-ray spectroscopy of the low and high states of the Seyfert 1 galaxy NGC 4051 with Chandra LETGS

, 2009
Context. With the new generation of high-resolution X-ray spectrometers the understanding of warm absorbers in active galactic nuclei has improved considerably.
Astrophysics, Fenovcik, M., M. Feňovčík, F. Verbunt, K. C. Steenbrugge, Steenbrugge, K.C., Costantini, E., Verbunt, F.W.M., Kaastra, J.S., Dep Natuurkunde, Sub High energy Astrophysics begr 1/1/15, J. S. Kaastra, E. Costantini   +12 more
core   +1 more source

Polymict melt‐bearing breccia dikes in the Morokweng impact structure formed by slip‐induced mechanical mixing of pseudotachylite and cataclasite along large‐displacement impact faults

Meteoritics &Planetary Science, EarlyView.
Abstract A core drilled through shocked and faulted Archean granitoid gneisses and dolerites in the eroded peak ring of the 70–80 km diameter Morokweng impact structure intersects multiple centimeter‐ to meter‐wide clastic‐matrix breccias containing a polymict clast population of lithic and mineral clasts and altered, millimeter‐ to centimeter ‐size ...
Roger L. Gibson, S'lindile S. Wela, Leonidas C. Vonopartis, Marco A. G. Andreoli   +3 more
wiley   +1 more source

High Energy Density Laboratory Astrophysics

, 2004
High-energy-density (HED) physics refers broadly to the study of macroscopic collections of matter under extreme conditions of temperature and density.
Remington, B. A.
core  

Araguainha Dome, Brazil: A polygonal impact structure due to a complex pre‐impact regional structural framework

Meteoritics &Planetary Science, EarlyView.
Abstract We investigated the structural framework of the north–northwestern Paraná Basin in Brazil to test whether the pre‐impact structures in this region may have had any influence on the first‐order formation and morphostructure of the Araguainha impact structure (AIS).
Renato B. Bernardes, Wolf U. Reimold, Roger L. Gibson, Julia B. Curto Ma, Adolfo B. Silva, Natalia Hauser   +5 more
wiley   +1 more source

Atmospheric Cerenkov astronomy of cataclysmic variables & other potential gamma ray sources [PDF]

, 1993
Recent developments in the application of the atmospheric Cerenkov technique to 7-ray astronomy are reviewed here. These include new methods of signal to noise enhancement and the increasing diversity of stellar systems positively identified as Very High
Bradbury, S.M, Bradbury, Stella Marie
core  

Revisiting the Hummeln structure, Sweden—A shallow marine Cambrian impact structure

Meteoritics &Planetary Science, EarlyView.
Abstract Hummeln is a simple impact structure located in south‐eastern Sweden. It is approximately 1.2 km in diameter and almost completely covered by a lake. Here, we present the first detailed investigation of impactites and mapping of the 164.25 m deep drill core Hummeln‐1 with a focus on impact metamorphism and the impact process.
S. Alwmark, J. Granbom, P. Ahlberg, M. Calner, S. Richoz, K. J. Gajewska, W. R. Hyde, K. Ljung, C. Alwmark   +8 more
wiley   +1 more source

High-Energy Astrophysics: An Overview

, 2007
High-energy astrophysics is the study of objects and phenomena in space with energy densities much greater than that found in normal stars and galaxies. These include black holes, neutron stars, cosmic rays, hypernovae and gamma-ray bursts. A history and
Fishman, Gerald J.
core  

Spectroscopy in Utrecht: a brief history

, 2010
In the first half of the 20th century, Leonard Ornstein turned the Physics Laboratory of Utrecht University into a center for testing the nascent quantum mechanics through accurate measurements of line intensities in flame spectra. The microphotometer of
Astrophysics, Verbunt, F.W.M., Frank Verbunt, Bleeker, J.A.M., Dep Natuurkunde, Johan Bleeker, Sub High energy Astrophysics begr 1/1/15   +6 more
core   +1 more source

Thermal histories of El Médano 300 (EM 300) and Northwest Africa 8155 (NWA 8155): Implications for the diversity of IAB‐ungrouped iron meteorites and their parent bodies

Meteoritics &Planetary Science, EarlyView.
Abstract This study provides the first petrographic, crystallographic, and chemical comparison between El Médano 300 (EM 300) and Northwest Africa 8155 (NWA 8155), two particular IAB‐ungrouped iron meteorites. Both contain exceptionally large graphite nodules and “flowers”, providing unique insights into carbon behavior in metallic melts and cooling ...
L. Perez, M. Roskosz, F. Danoix, L. Kern, V. Megevand, C. Brillatz, B. Devouard, J. Gattacceca, M. Gounelle   +8 more
wiley   +1 more source