Results 81 to 90 of about 502,910 (303)

The Impact of Observing Cadence and Undetected Companions on the Accuracy of Planet Mass Measurements from Radial Velocity Monitoring

The Astronomical Journal
We conduct experiments on both real and synthetic radial velocity (RV) data to quantify the impact that observing cadence, the number of RV observations, and undetected companions all have on the accuracy of small planet mass measurements.
Joseph M. Akana Murphy, Rafael Luque, Natalie M. Batalha   +2 more
doaj   +1 more source

Periodic radial velocity variations in RU Lupi

, 2006
Context. RU Lup is a Classical T Tauri star with unusually strong emission lines, which has been interpreted as manifestations of accretion. Recently, evidence has accumulated that this star might have a variable radial velocity. Aims.
Gahm, G. F., Petrov, P. P, Stempels, H. C.   +2 more
core   +2 more sources

Engineered Mycelial Scaffolds With Tunable Ultraviolet Protection, Wettability, Thermal Stability, and Spatial Mechanics

Advanced Engineering Materials, EarlyView.
Fungal mycelia grown into biodegradable scaffolds and infused with titania nanoparticles show enhanced ultraviolet shielding, thermal protection, and surface nonwettability. Properties were tuned by drying methods, revealing structure–function relationships.
Juwon S. Afolayan, Xin Zhang, Carole C. Perry   +2 more
wiley   +1 more source

Do stellar magnetic cycles influence the measurement of precise radial velocities?

, 2010
The ever increasing level of precision achieved by present and future radial-velocity instruments is opening the way to discovering very low-mass, long-period planets (e.g. solar-system analogs).
Boisse, Bonfils, Bouchy, Brandt, C. Lovis, C. Melo, Cincunegui, Danks, Dravins, Duquennoy, Fernandes, Flower, Golimowski, Halbwachs, Heintz, Huélamo, J. Gomes da Silva, Kürster, Landman, Livingston, Livingston, Lépine, Mayor, Mayor, McMillan, Melo, Meunier, N. C. Santos, Noyes, Paulson, Pepe, Queloz, Queloz, Saar, Saar, Saar, Santos, Santos, Santos, Schaerer, Schaerer, Schaller, Sousa, Tokovinin, Udry, Vaughan, Vaughan, Wright   +47 more
core   +1 more source

Influence of an Oxygen‐Free Atmosphere on Diamond‐Single‐Grain Scratching of Ti–6Al–4V

Advanced Engineering Materials, EarlyView.
Single‐grain scratching of Ti–6Al–4V is investigated under controlled, oxygen‐free, and ambient atmospheres using a novel experimental setup with in situ high‐speed imaging. The approach enables direct observation of chip formation and adhesion under suppressed oxidation.
Berend Denkena, Benjamin Bergmann, Michael Zenger   +2 more
wiley   +1 more source

An RTK UAV-Based Method for Radial Velocity Validation of Weather Radar

Remote Sensing
The quality of weather radar affects the reliability and effectiveness of monitoring severe convective weather. Therefore, rigorous calibration and validation are the foundation for the quantitative application of weather radar.
Yubao Chen, Lu Li, Fei Ye, Boshi Kang, Xiaopeng Wang, Zhichao Bu, Moyan Zhu, Qian Yang, Nan Shao, Jianyun Zhang   +9 more
doaj   +1 more source

Precise Radial Velocities [PDF]

International Astronomical Union Colloquium, 1992
AbstractCurrent techniques for the detection of long-term, low-amplitude (<50 m s−1), radial velocity variations are briefly reviewed together with some of their most successful programs. In the era of 8- to 10-m telescopes we must strive for a precision of < 1ms−1.
openaire   +1 more source

The velocity distribution of nearby stars from Hipparcos data I. The significance of the moving groups

, 2009
We present a three-dimensional reconstruction of the velocity distribution of nearby stars (
Asiain, Baade, Bienaymé, Binney, Binney, Blaauw, Bovy, Bozdogan, Cabrera-Caño, Chaudhuri, Chen, Chereul, Conway, David W. Hogg, Dehnen, Dempster, Eddington, Eggen, Eggen, Eggen, Eggen, Eggen, Eggen, ESA., Figueras, Francis, Gelman, Gerbaldi, Gilmore, Gomez, Grenier, Grünwald, Hogg, Ivezić, Jo Bovy, Johnston, Kapteyn, Kolmogorov, Koposov, Koposov, McDonald, Murenzi, Mädler, Navarro, Ogorodnikov, Ogorodnikov, Oliver, Oliver, Oort, Ormoneit, Plummer, Rasmuson, Sam T. Roweis, Schwarzschild, Schwarzschild, Silverman, Simon, Slezak, Soubiran, Starck, Stone, Tollerud, Tuominen, Ueda, Wallace, Wallace, Wallace, Williams, Williams, Zador, Zhao   +70 more
core   +2 more sources

Investigation of Oxygen‐Free Wetting Behavior of Aluminum on Copper via Molecular Dynamics Simulations and Experiments

Advanced Engineering Materials, EarlyView.
The wettability of aluminum droplets (Al) on different copper substrates (Cu), where liquid Al spreads on solid Cu surfaces to form a liquid–solid interface, is studied numerically and experimentally. The experimental and numerical results show good agreement in the fast‐spreading regime.
Shan Lyu, Timon Steinhoff, Finn‐Lennard Janthur, Sarah Seffer, Jörg Hermsdorf, Christian Klose, Ludger Overmeyer, Hans‐Jürgen Maier, Nina Merkert   +8 more
wiley   +1 more source

Shape of the Galactic Orbits in Clusters

, 1998
A kinematical analysis applied to a sample of galaxy clusters indicates that the differences between the velocity distribution of elliptical and spiral galaxies are associated with the shape of their orbit families.
Amelia C. Ramirez, Andreon S., Andreon S., Andreon S., Bird C. M., Biviano A., Biviano A., Gregorini L., Moss C., Navarro J. F., Paturel G., Ronaldo E. de Souza, West M. J.   +12 more
core   +1 more source