Results 91 to 100 of about 85,937 (304)

Mapping Distances across the Perseus Molecular Cloud Using CO Observations, Stellar Photometry, and Gaia DR2 Parallax Measurements [PDF]

Astrophysical Journal, 2018
We present a new technique to determine distances to major star-forming regions across the Perseus Molecular Cloud, using a combination of stellar photometry, astrometric data, and 12CO spectral-line maps. Incorporating the Gaia DR2 parallax measurements
C. Zucker, E. Schlafly, J. Speagle, G. Green, S. Portillo, D. Finkbeiner, A. Goodman   +6 more
semanticscholar   +1 more source

The Bayesian sinking in Porticello: a predictable convective windstorm?

Weather, EarlyView.
The meteorological phenomenon that led to the Bayesian yacht sinking in Sicily at 0206 utc on 19 August 2024 is here investigated. A thunderstorm occurred during the sinking, but uncertainties exist regarding whether a waterspout or a downburst affected the ship. An in‐depth analysis of available observations highlighted that the ship was likely struck
Francesco De Martin, Mario Marcello Miglietta, Thomas Gastaldo, Michele Martinazzo, Federico Pavan, Matteo Siena, Silvana Di Sabatino   +6 more
wiley   +1 more source

Optical Gravitational Lensing Experiment. OGLE-1999-BUL-19: The First Multi-Peak Parallax Event [PDF]

, 2002
We describe a highly unusual microlensing event, OGLE-1999-BUL-19, which exhibits multiple peaks in its light curve. The Einstein radius crossing time for this event is approximately one year, which is unusually long. We show that the motion of the Earth
A. Udalski, Agol, Alard, Albrow, Alcock, Alcock, Alcock, Alcock, An, Becker, Bennett, Bessell, Bond, Cox, Delplancke, Derue, Dominik, Dominik, Dominik, Duquennoy, G. Pietrzyński, Girardi, Gould, Gould, Gould, Gould, Gould, Gould, Griest, Han, Han, Han, Han, Han, Hosokawa, Høg, I. Soszyński, K. Żebruń, Landau, M. Kubiak, M. Szymański, Mao, Mao, Mao, Mao, Mao, Mao, Martin C. Smith, Miyamoto, Nemiroff, P. Woźniak, Paczyński, Paczyński, Paczyński, Paczyński, Schechter, Shude Mao, Smith, Soszyński, Stanek, Udalski, Udalski, Walker, Witt, Woźniak, Woźniak   +65 more
core   +2 more sources

The predatory behavior of ants: an impressive panoply of morphological adaptations

Insect Science, EarlyView.
This review focuses on predation in ants, showing the wide diversity of cases from solitary foraging to group hunting tactics, as well as the evolution of mandible shape frequently adapted to capture specific prey. Although most ants are generalist feeders, finding their sugary substances directly on plants or indirectly via sap‐sucking insects, some ...
Alain Dejean, Xim Cerdá, Jérôme Orivel, Frédéric Azémar, Alexander L. Wild, Bruno Corbara, Axel Touchard   +6 more
wiley   +1 more source

Stereoscopic Estimation of Volcanic Ash Cloud-Top Height from Two Geostationary Satellites

Remote Sensing, 2016
The characterization of volcanic ash clouds released into the atmosphere during explosive eruptions includes cloud height as a fundamental physical parameter.
Luca Merucci, Klemen Zakšek, Elisa Carboni, Stefano Corradini   +3 more
doaj   +1 more source

Simulation of CSST’s astrometric capability

Frontiers in Astronomy and Space Sciences, 2023
Introduction: The China Space Station Telescope (CSST) will enter a low Earth orbit around 2024 and operate for 10 years, with seven of those years devoted to surveying the area of the median-to-high Galactic latitude and median-to-high Ecliptic latitude
Zhen-Sen Fu, Zhen-Sen Fu, Zhao-Xiang Qi, Zhao-Xiang Qi, Shi-Long Liao, Shi-Long Liao, Xi-Yan Peng, Yong Yu, Yong Yu, Qi-Qi Wu, Qi-Qi Wu, Li Shao, You-Hua Xu   +12 more
doaj   +1 more source

Projective Displacement Mapping for Ray Traced Editable Surfaces

Computer Graphics Forum, EarlyView.
Abstract Displacement mapping is an important tool for modeling detailed geometric features. We explore the problem of authoring complex surfaces while ray tracing interactively. Current techniques for ray tracing displaced surfaces rely on acceleration structures that require dynamic rebuilding when edited.
Rama Hoetzlein
wiley   +1 more source

Trigonometric Parallax of W51 Main/South

, 2010
We report measurement of the trigonometric parallax of W51 Main/South using the Very Long Baseline Array (VLBA). We measure a value of 0.185 +/- 0.010 mas, corresponding to a distance of 5.41 (+0.31/-0.28) kpc. W51 Main/South is a well-known massive star-
A. Brunthaler, Barbosa, Beasley, Briggs, Brunthaler, Choi, Fey, Figuerêdo, Genzel, Ghez, Gillessen, Greisen, Hachisuka, Hachisuka, Hirota, Ho, Honma, Honma, Imai, K. M. Menten, Keto, Kim, M. J. Reid, M. Sato, Ma, Moellenbrock, Moscadelli, Moscadelli, Oh, Okumura, Reid, Reid, Reid, Reid, Reid, Sanna, Sato, Sato, Shi, Shi, Sivia, Tang, Xu, Zhang, Zhang, Zhang   +45 more
core   +1 more source

On Pulsar Distance Measurements and their Uncertainties [PDF]

, 2012
Accurate distances to pulsars can be used for a variety of studies of the Galaxy and its electron content. However, most distance measures to pulsars have been derived from the absorption (or lack thereof) of pulsar emission by Galactic HI gas, which ...
A. A. Chael, Brisken, Brisken, Chatterjee, Chatterjee, Chatterjee, D. R. Lorimer, Deller, Deller, Deller, Dodson, Faucher-Giguère, Fomalont, Gaensler, J. M. Weisberg, J. P. W. Verbiest, Jacoby, Jacoby, Johnston, Joncas, K. J. Lee, Kaplan, Kerr, Leahy, Lewandowski, Lommen, Lommen, Manchester, Manchester, McClure-Griffiths, Minter, Nice, Reid, Saravanan, Stairs, Strom, Tian, Weisberg, Wolszczan   +38 more
core   +3 more sources

Eye Pointing in Stereoscopic Displays

Journal of Eye Movement Research, 2016
This study investigated eye pointing in stereoscopic displays. Ten participants performed 18 tapping tasks in stereoscopic displays with three different levels of parallax (at the screen, 20 cm and 50 cm in front of the screen).
Chiuhsiang Joe Lin, Retno Widyaningrum
doaj   +1 more source