Results 71 to 80 of about 2,088,463 (342)

VARIATIONS OF THE β CEPHEI Hα LINE PARAMETERS IN 1993 - 1998.

Odessa Astronomical Publications, 2017
We use high-dispersion CCD spectrograms obtained in 1993 - 1998 to study parameter variations of the absorption and emission components Hα line of the star β Cephei. We show that radial velocity of the emission component does not depend on star pulsation
E. A. Panko, A. E. Tarasov
doaj   +1 more source

Radial Velocity Fitting Challenge. I. Simulating the data set including realistic stellar radial-velocity signals [PDF]

, 2016
Stellar signals are the main limitation for precise radial-velocity (RV) measurements. These signals arise from the photosphere of the stars. The m/s perturbation created by these signals prevents the detection and mass characterization of small-mass ...
X. Dumusque, X. Dumusque
semanticscholar   +1 more source

Expanding Hereditary Spastic Paraplegias Limits: Biallelic SPAST Variants in Cerebral Palsy Mimics

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Hereditary spastic paraplegias (HSP) are rare neurodegenerative disorders marked by spasticity and lower limb weakness. The most common type, SPG4, is usually autosomal dominant and caused by SPAST gene variants, typically presenting as pure HSP.
Gregorio A. Nolasco, Mònica Roldán, Yalda Jamshidi, Ioannis Georvasilis, Rocío Jadraque Rodríguez, Reza Boostani, Ali Shoeibi, Lluís Armengol, Anna Codina, Ehsan Ghayoor Karimiani, Cristina Hernando‐Davalillo, Loreto Martorell, María Luisa Ramírez Almaraz, Jordi Muchart, Carlos Ortez, Andrés Nascimento, Roser Urreizti, Daniel Natera‐de Benito, Mercedes Serrano   +18 more
wiley   +1 more source

Theoretical and Experimental Study of Radial Velocity Generation for Extending Bandwidth of Magnetohydrodynamic Angular Rate Sensor at Low Frequency

Sensors, 2015
The magnetohydrodynamics angular rate sensor (MHD ARS) has received much attention for its ultra-low noise in ultra-broad bandwidth and its impact resistance in harsh environments; however, its poor performance at low frequency hinders its work in long ...
Yue Ji, Xingfei Li, Tengfei Wu, Cheng Chen   +3 more
doaj   +1 more source

RADIAL VELOCITY MONITORING OF KEPLER HEARTBEAT STARS [PDF]

, 2016
Heartbeat stars (HB stars) are a class of eccentric binary stars with close periastron passages. The characteristic photometric HB signal evident in their light curves is produced by a combination of tidal distortion, heating, and Doppler boosting near ...
Avi Shporer, J. Fuller, H. Isaacson, K. Hambleton, S. Thompson, A. Prša, D. Kurtz, A. Howard, Ryan M. O'Leary   +8 more
semanticscholar   +1 more source

Commission 30: Radial Velocities: (Vitesses Radiales) [PDF]

Transactions of the International Astronomical Union, 2000
Commission 30 has 120 members in 28 countries who are active in the area of radial velocities. During the past triennium 11 new members have joined the commission. The work of the commission covers a wide range of topics all of which concern the application of the Doppler effect to astronomical objects, including galaxies and the interstellar medium as
Nidia Morrell, Francis C. Fekel, R.P. Stefanik, Stéphane Udry, Birgitta Nordström, Andrei Tokovinin, J.B. Hearnshaw, H. Quintana, W.D. Cochran, T. Mazeh   +9 more
openaire   +3 more sources

Data‐Driven Distributed Safe Control Design for Multi‐Agent Systems

International Journal of Adaptive Control and Signal Processing, EarlyView.
This paper presents a data‐driven control barrier function (CBF) technique for ensuring safe control of multi‐agent systems (MASs) with uncertain linear dynamics. A data‐driven quadratic programming (QP) optimization is first developed for CBF‐based safe control of single‐agent systems using a nonlinear controller. This approach is then extended to the
Marjan Khaledi, Bahare Kiumarsi
wiley   +1 more source

Long-term radial-velocity variations of the Sun as a star: The HARPS view [PDF]

, 2016
Stellar radial velocities play a fundamental role in the discovery of extrasolar planets and the measurement of their physical parameters as well as in the study of stellar physical properties.
Antonino Francesco Lanza, P. Molaro, L. Monaco, R. Haywood   +3 more
semanticscholar   +1 more source

Radial velocity signatures of Zeeman broadening [PDF]

Astronomy & Astrophysics, 2013
Stellar activity signatures such as spots and plage can significantly limit the search for extrasolar planets. Current models of activity-induced radial velocity (RV) signals focused on the impact of temperature contrast in spots predicting the signal to diminish toward longer wavelengths. On the other hand, the relative importance of the Zeeman effect
Reiners, Ansgar, Shulyak, D., Anglada-Escude, Guillem, Jeffers, Sandra V., Morin, Julien, Zechmeister, Mathias, Kochukhov, Oleg, Piskunov, Nikolai E.   +7 more
openaire   +5 more sources

Comparative Wear and Friction Analysis of Sliding Surface Materials for Hydrostatic Bearing under Oil Supply Failure Conditions

Advanced Engineering Materials, EarlyView.
Hydrostatic bearings excel in high‐precision applications, but their performance hinges on a continuous external supply. This study evaluates various material combinations for sliding surfaces to mitigate damage during supply failures or misalignment and to discover the most effective materials identified for enhancing the reliability and efficiency of
Michal Michalec, Lukáš Daněk, Jan Foltýn, Petr Svoboda, Carsten Gachot, Martin Hartl, Ivan Křupka   +6 more
wiley   +1 more source