Results 41 to 50 of about 1,022 (263)

A model oscillator of irregular stellar variability [PDF]

Astrophysics and Space Science, 1988
Stellar pulsation is one of the condidates for strong mass loss from red giant stars. Recent investigations have shown sporadic outbursts of the pulsation can eject a considerable mass from the stars. Such a sporadic increase of the amplitudes seems to have a connection with the irregularity found in the pulsations.
Mine Takeuti, Yasuo Tanaka
openaire   +1 more source

Electrochemical Evaluation of Compressed Selective Laser Melted AlSi7Mg and AlSi10Mg Alloys in Chloride Environment

Advanced Engineering Materials, EarlyView.
The corrosion performance of AlSi7Mg and AlSi10Mg alloys produced through selective laser melting (SLM) was examined under compressive stress in a chloride environment. Electrochemical analyses, including open‐circuit potential (OCP), potentiodynamic polarization (CPP), and electrochemical impedance spectroscopy (EIS), were complemented by scanning ...
Femi John Akinfolarin, Samson Dare Oguntuyi, Peter Apata Olubambi   +2 more
wiley   +1 more source

Accretion shock stability on a dynamically heated YSO atmosphere with radiative transfer

EPJ Web of Conferences, 2014
Theory and simulations predict Quasi-Periodic Oscillations of shocks which develop in magnetically driven accretion funnels connecting the stellar disc to the photosphere of Young Stellar Objects (YSO).
de Sá Lionel, Chièze Jean-Pierre, Stehlé Chantal, Matsakos Titos, Ibgui Laurent, Lanz Thierry, Hubeny Ivan   +6 more
doaj   +1 more source

Near‐Field Electrospinning Micro‐Printhead Achieves Precise Control of Nanofiber Deposition

Advanced Engineering Materials, EarlyView.
A micro‐printhead for near‐field electrospinning enables reproducible deposition of polymer nanofibers with diameters below 50 nm. Systematic parameter studies uncover the mechanisms linking operating conditions to fiber morphology, paving the way for precise and low‐cost nanoscale 3D manufacturing.As a high‐resolution, cost‐effective, and rapid ...
Han Xu, Dario Mager, Jan G. Korvink
wiley   +1 more source

Ensemble Asteroseismology for 138 Kepler Metal-poor Red Giants: Stellar Fundamental Parameters

The Astrophysical Journal
We present the analysis of solar-like oscillations for 138 metal-poor red giants observed by Kepler. We extracted individual oscillation modes and used them to characterize stars via a detailed modeling approach.
Tanda Li, Shaolan Bi, Yaguang Li, Yaqian Wu, Ruizhi Zhang, Martin Nielsen, Courtney L. Crawford, Gang Li   +7 more
doaj   +1 more source

Oscillations in stellar atmospheres

The Astrophysical Journal, 1989
Atmospheric excitation and propagation of oscillations are analyzed for typical pulsating stars. The linear, plane-parallel approach for the pulsating atmosphere gives a local description of the phenomenon. From the local analysis of oscillations, the minimum frequencies are obtained for radially propagating waves.
A. Costa, A. E. Ringuelet, J. M. Fontenla   +2 more
openaire   +1 more source

Powder Optimization Strategies for Binder Jetting Printing of BaTiO3 and Ba0,6Sr0,4TiO3 Ceramics

Advanced Engineering Materials, EarlyView.
Powder optimization is investigated to enable binder jetting of BaTiO3 and Ba0.6Sr0.4TiO3 ferroelectric ceramics. The antagonistic relationship between flowability and binder compatibility is addressed through binder impregnation of granulated powders and fumed silica addition to fine powders.
Fanny Pruvost, Lionel Presmanes, Soléna Colin, Marie Vidal, Sophie Guillemet‐Fritsch   +4 more
wiley   +1 more source

TESS Asteroseismology of β Hydri: A Subgiant with a Born-again Dynamo

The Astrophysical Journal
The solar-type subgiant β Hyi has long been studied as an old analog of the Sun. Although the rotation period has never been measured directly, it was estimated to be near 27 days.
Travis S. Metcalfe, Jennifer L. van Saders, Daniel Huber, Derek Buzasi, Rafael A. García, Keivan G. Stassun, Sarbani Basu, Sylvain N. Breton, Zachary R. Claytor, Enrico Corsaro, Martin B. Nielsen, J. M. Joel Ong, Nicholas Saunders, Amalie Stokholm, Timothy R. Bedding   +14 more
doaj   +1 more source

The SAGA so far: reading the history of the Galaxy with asteroseismology

EPJ Web of Conferences, 2015
Asteroseismology has the capability of delivering stellar properties which would otherwise be inaccessible, such as radii, masses and thus ages of stars.
Casagrande Luca, Aguirre Victor Silva, Serenelli Aldo M., Stello Dennis, Feltzing Sofia, Schlesinger Katharine J.   +5 more
doaj   +1 more source

Stellar oscillations induced by the passage of a fast stellar object [PDF]

International Journal of Modern Physics D, 2014
In this paper, we investigate induced oscillations by the gravitational field of a fast stellar object, such as a neutron star or a black-hole in a near miss collision with another star. Nonadiabatic collision conditions may lead to large amplitude oscillations in the star.
Bertulani, C. A., Naizer, M., Newton, W.
openaire   +2 more sources