Results 71 to 80 of about 614,016 (317)

A Q‐Learning Algorithm to Solve the Two‐Player Zero‐Sum Game Problem for Nonlinear Systems

International Journal of Adaptive Control and Signal Processing, Volume 39, Issue 3, Page 566-581, March 2025.
A Q‐learning algorithm to solve the two‐player zero‐sum game problem for nonlinear systems. ABSTRACT This paper deals with the two‐player zero‐sum game problem, which is a bounded L2$$ {L}_2 $$‐gain robust control problem. Finding an analytical solution to the complex Hamilton‐Jacobi‐Issacs (HJI) equation is a challenging task.
Afreen Islam, Anthony Siming Chen, Guido Herrmann   +2 more
wiley   +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

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

Jets in Quasi-stellar Objects [PDF]

Nature, 1968
McCREA1 has raised the interesting possibility that the line spectrum from quasi-stellar objects could arise from a jet aimed toward the observer. McCrea states that this sort of model avoids the intergalactic absorption of Lyman α from 3C9 predicted by Gunn and Peterson2 if the density of neutral intergalactic hydrogen at z = 2 is of the order of 10 ...
openaire   +1 more source

Discovery of Jet–Bubble–Disk Interaction: Jet Feedback on a Protoplanetary Disk Via an Expanding Bubble in WSB 52

The Astrophysical Journal
While stellar jets and outflows are fueled by accretion from disks, their direct influence on disks remain unexplored. Here, we revisit Atacama Large Millimeter/submillimeter Array observations of ^12 CO ( J  = 2–1) line emission for the young stellar ...
Masataka Aizawa, Ryuta Orihara, Munetake Momose   +2 more
doaj   +1 more source

Jet-powered Turbulence in Common Envelope Evolution

The Astrophysical Journal, 2023
We conduct a three-dimensional hydrodynamical simulation of common envelope evolution (CEE) where a neutron star (NS) spirals in inside the envelope of a red supergiant star in a predetermined orbit.
Shlomi Hillel, Ron Schreier, Noam Soker
doaj   +1 more source

Simulated images of stellar jets

The Astronomical Journal, 1991
In many cases, the sources of jetlike Herbig-Haro objects are optically invisible, embedded objects which are usually detected at infrared wavelengths. The jets become visible only at distance of 10 16 -10 17 cm from the source, where they emerge from the molecular cloud core that surrounds the central object.
Hume A. Feldman, A. C. Raga
openaire   +1 more source

Enhancing Strength and Electrical Conductivity in Al–Zr–Sc Conductor Alloys Through Sn and Sr Microalloying and Two‐Step Aging Treatment

Advanced Engineering Materials, EarlyView.
Trace additions of Sn and Sr combined with a two‐step aging treatment are shown to enhance the microstructure and performance of Al–Zr–Sc conductor alloys. Strength and electrical conductivity increase concurrently through accelerated precipitation of fine Al3(Sc, Zr) precipitates and improved dislocation resistance, offering a cost‐effective pathway ...
Quan Shao, Emad M. Elgallad, Alexandre Maltais, X.‐Grant Chen   +3 more
wiley   +1 more source

Shooting for the Stars: Jet-mode Feedback and AGN Jet Deceleration from Stellar Mass Loading

The Astrophysical Journal
Active Galactic Nucleus (AGN) jets are thought to be vital ingredients in galaxy evolution through the action of kinetic feedback; however, how narrow, relativistic outflows couple to galaxies remains an open question.
Talia M. O’Shea, Sebastian Heinz, Melinda Soares-Furtado, Zsofi Igo, Andrea Merloni   +4 more
doaj   +1 more source

Discovery of synchrotron emission from a YSO jet

EPJ Web of Conferences, 2013
Synchrotron emission at radio wavelengths is commonly found in relativistic jets from active galactic nuclei (AGNs) and microquasars and allows the study of the magnetic field in these kind of jets.
Carrasco-González Carlos, Rodríguez Luis F., Anglada Guillem, Martí Josep, Torrelles Jose M., Osorio Mayra   +5 more
doaj   +1 more source