Results 51 to 60 of about 502,910 (303)

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

WIYN Open Cluster Study. XXXVIII. Stellar Radial Velocities in the Young Open Cluster M35 (NGC 2168) [PDF]

, 2009
We present 5201 radial-velocity measurements of 1144 stars, as part of an ongoing study of the young (150 Myr) open cluster M35 (NGC 2168). We have observed M35 since 1997, using the Hydra Multi-Object Spectrograph on the WIYN 3.5m telescope. Our stellar
Aaron M. Geller, Barrado y Navascués, Christopher J. Dolan, Duquennoy, Ella K. Braden, Geller, Goldberg, Hole, Imants Platais, Kalirai, Kroupa, Mathieu, Mathieu, Mazeh, McNamara, Meibom, Meibom, Meibom, Meibom, Reimers, Rhode, Robert D. Mathieu, Steinhauer, Søren Meibom, von Hippel, Williams, Williams, Williams   +27 more
core   +1 more source

Bistable Mechanisms 3D Printing for Mechanically Programmable Vibration Control

Advanced Engineering Materials, EarlyView.
This work introduces a 3D‐printed bistable mechanism integrated into tuned mass dampers (TMDs) for mechanically adaptive passive vibration suppression. Through optimized geometry, the bistable design provides adaptable vibration reduction across a broad range of scenarios, achieving effective vibration mitigation without complex controls or external ...
Ali Zolfagharian, Frédéric Demoly, Mohammad Lakhi, Bernard Rolfe, Mahdi Bodaghi   +4 more
wiley   +1 more source

Wake Analysis of Wind Turbine Based on Scanning Images from Doppler Lidar

南方能源建设
[Objective] To fully explore the data value of lidar in wind turbine wake observation, conduct an in-depth study on the three-dimensional (3D) wake structure and wind speed attenuation characteristics in wake zone, and further provide references for ...
Yanfeng CAI, Fareng YAO, Jiyan WANG
doaj   +1 more source

30. Radial Velocities [PDF]

Transactions of the International Astronomical Union, 1985
This report covers the period June 1981 to June 1984. and includes some material from IAU Colloquium No. 88, October, 1984.). The field of radial velocities has undergone a renaissance in the last few years as the new radial velocity machines have come into use. Not only can stars of much fainter magnitudes be reached, but the precision of the measured
A. G. Davis Philip, J. Andersen, A. Batten, M. Duflot, D. Hube, M. Mayor, J. Sahade   +6 more
openaire   +1 more source

Velocity and velocity bounds in static spherically symmetric metrics

, 2010
We find simple expressions for velocity of massless particles in dependence of the distance $r$ in Schwarzschild coordinates. For massive particles these expressions put an upper bound for the velocity.
Arraut, I., Batic, D., Nowakowski, M.
core   +1 more source

Characterization of Defect Distribution in an Additively Manufactured AlSi10Mg as a Function of Processing Parameters and Correlations with Extreme Value Statistics

Advanced Engineering Materials, EarlyView.
Predicting extreme defects in additive manufacturing remains a key challenge limiting its structural reliability. This study proposes a statistical framework that integrates Extreme Value Theory with advanced process indicators to explore defect–process relationships and improve the estimation of critical defect sizes. The approach provides a basis for
Muhammad Muteeb Butt, Varma Kvvssn, Hossein Laieghi, Zia Uddin, Peyman Ansari, E. Kıvanç Sadak, Can Barış Toprak, Hüseyin Kızıl, Enrico Salvati   +8 more
wiley   +1 more source

The VLT-FLAMES Tarantula Survey XVIII. Classifications and radial velocities of the B-type stars [PDF]

, 2015
We present spectral classifications for 438 B-type stars observed as part of the VLT-FLAMES Tarantula Survey (VFTS) in the 30 Doradus region of the Large Magellanic Cloud. Radial velocities are provided for 307 apparently single stars, and for 99 targets
A. de Koter, Andrews, Balona, Banerjee, Banerjee, Bica, Blaauw, Bohannan, Bonanos, Bosch, Brott, Brunet, C. J. Evans, C. M. McEvoy, Chu, Clark, Clark, Clark, de Koter, de Mink, de Mink, Doran, Dufton, Dufton, Dunstall, Eldridge, Evans, Evans, Evans, Evans, Feast, Fitzgerald, Fitzpatrick, Fitzpatrick, Fujii, Graus, Grebel, Groh, Gummersbach, H. Sana, Hodge, Hodge, Hoogerwerf, Howarth, Howarth, Hubeny, Hubeny, Hubeny, Hunter, I. D. Howarth, J. Maíz Apellániz, J. S. Clark, J. S. Vink, Kalari, Lanz, Lennon, M. B. Kennedy, Markova, Markova, Martayan, Massey, Meixner, Melnick, N. Markova, N. R. Walborn, P. L. Dufton, P. R. Dunstall, Parker, Parker, Pasquini, Portegies Zwart, Poveda, Ramírez-Agudelo, Rivinius, Ryans, S. E. de Mink, S. Simón-Díaz, Sabbi, Sabbi, Sana, Santos, Schild, Shapley, Simón-Díaz, Smith, Sota, Testor, Townsley, Townsley, Trundle, V. Hénault-Brunet, W. D. Taylor, Walborn, Walborn, Walborn, Walborn, Walborn, Walborn, Walborn, Wright, Zorec   +100 more
core   +5 more sources

Experimental Evaluation of 100Cr6 Steel Microindented Surfaces Under Lubricated Nonconformal Point Contacts

Advanced Engineering Materials, EarlyView.
The tribological behavior of 100Cr6 steel spheres textured via Vickers microindentation is evaluated under lubricated sliding by varying both dimple size and density. Fine and dense textures significantly reduce friction across all lubrication regimes, while large dimples increase it.
Farideh Davoodi, Pasquale Guglielmi, Gianfranco Palumbo, Giuseppe Carbone   +3 more
wiley   +1 more source

Measurement of target radial velocity

Известия высших учебных заведений России: Радиоэлектроника, 2015
The multichannel and single-channel measuring instruments of target radial velocity with use multifrequency signals at presence correlated and non-correlated handicapes are synthesized.
D. I. Popov
doaj