scholarly journals Three-dimensional finite-time cooperative guidance for multiple missiles without radial velocity measurements

2019 ◽  
Vol 32 (5) ◽  
pp. 1294-1304 ◽  
Author(s):  
Teng LYU ◽  
Chuanjiang LI ◽  
Yanning GUO ◽  
Guangfu MA
Keyword(s):  
Radial Velocity ◽  
Finite Time ◽  
Three Dimensional ◽  
Velocity Measurements ◽  
Multiple Missiles ◽  
Cooperative Guidance

Black holes and rotation: Internal kinematics of star clusters with MUSE

2019 ◽  
Vol 14 (S351) ◽  
pp. 384-388
Author(s):  
Sebastian Kamann
Keyword(s):  
Black Holes ◽  
Radial Velocity ◽  
Massive Star ◽  
Three Dimensional ◽  
Star Clusters ◽  
Paradigm Change ◽  
Velocity Measurements ◽  
Fundamental Limitation ◽  
Integral Field ◽  
State Of Art

AbstractOver the last decade, our abilities to observe the internal kinematics of star clusters have drastically increased. Where a few years back only small numbers of bright stars with radial velocity measurements were available, we can nowadays study the three-dimensional motions of large stellar samples, thanks to the combined datasets gathered by state-of-art spectrographs and astrometric satellites. In this work, I summarise the contribution of integral-field spectrographs, in particular MUSE, to this paradigm change. Using dedicated software tools, we were able to overcome a fundamental limitation of spectroscopy and advance to the crowded cluster centres. This allowed us to study the central kinematics in unprecedented detail and to start uncovering the populations of black holes that reside in massive star clusters.

Finite-time adaptive cooperative guidance for multiple missiles

2021 ◽  
Author(s):  
Pengfei Shi ◽  
Jianglong Yu ◽  
Ziyan Chen ◽  
Xiwang Dong ◽  
Zhang Ren
Keyword(s):  
Finite Time ◽  
Multiple Missiles ◽  
Cooperative Guidance

scholarly journals A New, Young, Low-Mass Spectroscopic Binary Without a Home

2015 ◽  
Vol 10 (S314) ◽  
pp. 65-66
Author(s):  
Laura S. Flagg ◽  
Evgenya L. Shkolnik ◽  
Alycia J. Weinberger ◽  
Brendan P. Bowler ◽  
Adam L. Kraus ◽  
...  
Keyword(s):  
Radial Velocity ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Young Star ◽  
Proper Motions ◽  
Velocity Measurements ◽  
Spectroscopic Binary ◽  
Low Mass ◽  
Three Dimensional Space

AbstractWe have discovered that 2MASS 08355977-3042306 is an accreting K7, double-lined, spectroscopic binary younger than ~20 Myr. The age of a dispersed young star can best be determined if it is a member of a known young moving group. However, the three dimensional space velocities (UVW) we calculate using radial velocity measurements, proper motions, and plausible photometric distances make membership in any known young moving group unlikely.

Operational Model and its Validation with Drift Tests in Water Areas Around the Baltic Sea

1994 ◽  
Vol 29 (2-3) ◽  
pp. 293-308
Author(s):  
J. Koponen ◽  
M. Virtanen ◽  
H. Vepsä ◽  
E. Alasaarela
Keyword(s):  
Three Dimensional ◽  
Fast Response ◽  
Velocity Measurements ◽  
Short Term ◽  
Large Lakes ◽  
Operational Model ◽  
Water Currents ◽  
Emergency Situations ◽  
Sensitivity Tests ◽  
The Baltic

Abstract Three-dimensional (3-D) mathematical models of water currents, transport, mixing, reaction kinetic, and interactions with bottom and air have been used in Finland regularly since 1982 and applied to about 40 cases in large lakes, inland seas and their coastal waters. In each case, model validity has been carefully tested with available flow velocity measurements, tracer studies and water quality observations. For operational use, i.e., for spill combatting and sea rescue, the models need fast response, proven validity and illustrative visualization. In 1987-90, validated models were implemented for operational use at five sea areas along the Finnish coast. Further validation was obtained in model applications from nine documented or arranged cases and from seven emergency situations. Sensitivity tests supplement short-term validation. In the Bothnian Sea, it was nescessary to start the calculation of water currents three days prior to the start of the experiment to reduce initial inaccuracies and to make the coastal transport estimates meaningful.

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