Results 21 to 30 of about 959 (264)

Microstructural Evolution and Vacancy Defect Formation in Mn–Mo–Ni RPV Steel Under Low Cycle Fatigue: Insights From EBSD and PALS

Advanced Engineering Materials, EarlyView.
Low‐cycle fatigue damage in Mn–Mo–Ni reactor pressure vessel steel is examined using a combined electron backscatter diffraction and positron annihilation lifetime spectroscopy approach. The study correlates texture evolution, dislocation substructure development, and vacancy‐type defect formation across uniform, necked, and fracture regions, providing
Apu Sarkar, Dhanadeep Dutta, G. Bharat Reddy   +2 more
wiley   +1 more source

Mapping the Stellar Kinematics in the Central 240 pc of M87 with the James Webb Space Telescope

The Astrophysical Journal
The supermassive black hole (SMBH) in the giant elliptical galaxy M87 is one of the most well studied in the local Universe, but the stellar- and gas-dynamical SMBH mass measurements disagree.
Refa M. Al-Amri, Jonelle L. Walsh, Emily R. Liepold, Chung-Pei Ma, Jenny E. Greene   +4 more
doaj   +1 more source

A Complex Stellar Line-of-Sight Velocity Distribution in the Lenticular Galaxy NGC 524

Open Astronomy, 2011
We present a detailed study of the stellar and gaseous kinematics in the luminous early-type galaxy NGC 524, derived from the long-slit spectroscopic observations obtained with the Russian 6 m telescope and the IFU data from the SAURON survey.
Katkov I., Chilingarian I., Sil’chenko O., Zasov A., Afanasiev V.   +4 more
doaj   +1 more source

oMEGACat. I. MUSE Spectroscopy of 300,000 Stars within the Half-light Radius of ω Centauri

The Astrophysical Journal, 2023
Omega Centauri ( ω Cen) is the most massive globular cluster of the Milky Way and has been the focus of many studies that reveal the complexity of its stellar populations and kinematics.
M. S. Nitschai, N. Neumayer, C. Clontz, M. Häberle, A. C. Seth, T.-O. Husser, S. Kamann, M. Alfaro-Cuello, N. Kacharov, A. Bellini, A. Dotter, S. Dreizler, A. Feldmeier-Krause, M. Latour, M. Libralato, A. P. Milone, R. Pechetti, G. van de Ven, K. Voggel, Daniel R. Weisz   +19 more
doaj   +1 more source

Solid‐State Diffusion and Intermetallic Phase Formation in Roll‐Bonded Mg–Zn Composites With Kirigami‐Patterned Inlay

Advanced Engineering Materials, EarlyView.
Mg–Zn composites with a thickness of 0.21 mm were fabricated using roll bonding of a kirigami‐patterned Mg alloy inlay within a Zn matrix. Thermal activation following this process led to the formation of tailored intermetallic structures, which provided the composite with enhanced flexural strength.
Yaroslav Frolov, Oleksandr Bobukh, Christian Klose, Florian Nürnberger, Hans Jürgen Maier   +4 more
wiley   +1 more source

Stellar kinematics in the Galactic center

The Astrophysical Journal, 1989
The observations of the stellar kinematics in the central 8 pc of the Galaxy are presented. It is shown that the spectroscopy of the 2.3 microns CO absorption feature, in late type stars, yields the stellar velocity dispersion and the average stellar radial velocity as a function of galactocentric distance.
M. T. McGinn, K. Sellgren, E. E. Becklin, D. N. B. Hall   +3 more
openaire   +1 more source

Modeling gas and stellar kinematics in disc galaxies [PDF]

Astrophysics and Space Science, 2001
We present V-band surface photometry and major-axis kinematics of stars and ionized gas of three early-type spiral galaxies, namely NGC 772, NGC 3898 and NGC 7782. For each galaxy we built a self-consistent Jeans model for the stellar kinematics, adopting the light distribution of bulge and disc derived by means of a two-dimensional parametric ...
PIGNATELLI E., VEGA BELTRÁN J. C., BECKMAN J. E., CORSINI, ENRICO MARIA, PIZZELLA, ALESSANDRO, SCARLATA C., BERTOLA, FRANCESCO, FUNES J. G., ZEILINGER W. W.   +8 more
openaire   +2 more sources

Measuring the Central Dark Mass in NGC 4258 with JWST/NIRSpec Stellar Kinematics

The Astrophysical Journal
We present a new stellar-dynamical measurement of the supermassive black hole (SMBH) mass in the nearby spiral galaxy NGC 4258 (M106), a critical benchmark for extragalactic mass measurements.
Dieu D. Nguyen, Hai N. Ngo, Michele Cappellari, Tinh Q. T. Le, Tien H. T. Ho, Tuan N. Le, Elena Gallo, Niranjan Thatte, Fan Zou, Michele Perna, Miguel Pereira-Santaella   +10 more
doaj   +1 more source

Additive Manufacturing of Continuous Fibre Reinforced Composites: Process, Characterisation, Modelling, and Sustainability

Advanced Engineering Materials, EarlyView.
Additive manufacturing provides precise control over the placement of continuous fibres within polymer matrices, enabling customised mechanical performance in composite components. This article explores processing strategies, mechanical testing, and modelling approaches for additive manufactured continuous fibre‐reinforced composites.
Cherian Thomas, Amir Hosein Sakhaei
wiley   +1 more source

KINEMATICS OF CLASSICAL CEPHEIDS IN THE NUCLEAR STELLAR DISK [PDF]

The Astrophysical Journal, 2015
Classical Cepheids are useful tracers of the Galactic young stellar population because their distances and ages can be determined from their period-luminosity and period-age relations. In addition, the radial velocities and chemical abundance of the Cepheids can be derived from spectroscopic observations, providing further insights into the structure ...
Matsunaga, N., Fukue, K., Yamamoto, R., Kobayashi, N., Inno, L, Genovali, K., Bono, G., Baba, J., Fujii, M. S., Kondo, S., Ikeda, Y., Hamano, S., Nishiyama, S., Nagata, T., Aoki, W., Tsujimoto, T.   +15 more
openaire   +4 more sources