Results 61 to 70 of about 995 (179)

Defining the Termination of the Asymptotic Giant Branch [PDF]

The Astrophysical Journal, 2008
I suggest a theoretical quantitative definition for the termination of the asymptotic giant branch (AGB) phase and the beginning of the post-AGB phase. I suggest that the transition will be taken to occur when the ratio of the dynamical time scale to the the envelope thermal time scale, Q, reaches its maximum value. Time average values are used for the
openaire   +2 more sources

Goos–Hänchen effect singularities in transdimensional plasmonic films

Nanophotonics, Volume 14, Issue 25, Page 4513-4530, December 2025.
Abstract We identify and classify topologically protected singularities for the reflection coefficient of transdimensional plasmonic systems. Originating from nonlocal electromagnetic response due to vertical electron confinement in the system, such singularities lead to lateral (angular) Goos–Hänchen shifts on the millimeter (milliradian) scale in the
Svend‐Age Biehs, Igor V. Bondarev
wiley   +1 more source

Imputation of Fisheries Reference Points for Endangered Data‐Poor Fishes, With Application to Rhino Rays

Fish and Fisheries, Volume 26, Issue 5, Page 848-865, September 2025.
ABSTRACT For data‐limited fish species, sustainable management frequently relies on biological metrics that are derived from life‐history trait data, as opposed to high‐resolution time series of catch and abundance. These biological metrics are used to assess a species' recovery potential at low population densities, as well as their extinction risk ...
Catharine Horswill, Holly K. Kindsvater, Nick K. Dulvy, Chris G. Mull, Aaron B. Judah, Brooke M. D'Alberto, Jason Matthiopoulos, Marc Mangel   +7 more
wiley   +1 more source

An Innovative Tool for Measuring Sunlight Propagation Through Different Snowpacks

Earth and Space Science, Volume 12, Issue 8, August 2025.
Abstract Sunlight penetration in the snowpack plays a fundamental role in many environmental processes, ranging from local energy balance to snow microbiology and can potentially contribute to climate change. In addition, many photochemical reactions typically occur in the snowpack driven by solar radiation.
Luca Teruzzi, Andrea Spolaor, David Cappelletti, Claudio Artoni, Marco A. C. Potenza   +4 more
wiley   +1 more source

Turbulence of Tropical Cyclones: From Peristrophic to Zonostrophic

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 14, 28 July 2025.
Abstract Cyclostrophic rotation in the core region of tropical cyclones (TCs) imprints a distinct signature upon their turbulence structure. Its intensity is characterized by the radius of maximum wind, Rmw ${R}_{mw}$, and the azimuthal wind velocity at that radius, Umax ${U}_{max}$.
Boris Galperin, Alexander K. Nickerson, Gregory P. King, Jun A. Zhang   +3 more
wiley   +1 more source

Dusty Stellar Source Classification by Implementing Machine Learning Methods Based on Spectroscopic Observations in the Magellanic Clouds

The Astrophysical Journal
Dusty stellar point sources are a significant stage in stellar evolution and contribute to the metal enrichment of galaxies. These objects can be classified using photometric and spectroscopic observations using color–magnitude diagrams and infrared ...
Sepideh Ghaziasgar, Mahdi Abdollahi, Atefeh Javadi, Jacco Th. van Loon, Iain McDonald, Joana Oliveira, Amirhossein Masoudnezhad, Habib G. Khosroshahi, Bernard H. Foing, Fatemeh Fazel Hesar   +9 more
doaj   +1 more source

Edge of Chaos Theory Unveils the First and Simplest Ever Reported Hodgkin–Huxley Neuristor

Advanced Electronic Materials, Volume 11, Issue 8, June 2025.
This manuscript presents the first and simplest ever‐reported electrical cell, which leverages one memristor on Edge of Chaos to reproduce the three‐bifurcation cascade, marking the entire life cycle from birth to extinction via All‐to‐None effect of an electrical spike, also referred to as Action Potential, across axon membranes under monotonic ...
Alon Ascoli, Ahmet Samil Demirkol, Ioannis Messaris, Vasilis Ntinas, Dimitris Prousalis, Stefan Slesazeck, Thomas Mikolajick, Fernando Corinto, Michele Bonnin, Marco Gilli, Pier Paolo Civalleri, Ronald Tetzlaff, Leon Chua   +12 more
wiley   +1 more source

Theoretical Models for the Late Thermal Pulse in Post-asymptotic Giant Branch Stars: The Case of DY Cen

The Astrophysical Journal
We present theoretical predictions of the born-again scenario for post-asymptotic giant branch stars. An extensive model grid for born-again objects has been constructed, particularly including models for the very late thermal pulse with and without ...
Zhongyang Liu, C. Simon Jeffery, Xianfei Zhang, Shaolan Bi, Tanda Li   +4 more
doaj   +1 more source

Spitzer observations of large amplitude variables in the LMC and IC 1613

EPJ Web of Conferences, 2017
The 3.6 and 4.5 ìm characteristics of asymptotic giant branch variables in the LMC and IC 1613 are discussed. For C-rich Mira variables there is a very clear periodluminosity-colour relation, where the [3.6] .
Whitelock Patricia A., Kasliwal Mansi, Boyer Martha   +2 more
doaj   +1 more source

Pulsating stars in the VMC survey

EPJ Web of Conferences, 2017
The VISTA survey of the Magellanic Clouds system (VMC) began observations in 2009 and since then, it has collected multi-epoch data at Ks and in addition multi-band data in Y and J for a wide range of stellar populations across the Magellanic system ...
Cioni Maria-Rosa L., Ripepi Vincenzo, Clementini Gisella, Groenewegen Martin A.T., Moretti Maria I., Muraveva Tatiana, Subramanian Smitha   +6 more
doaj   +1 more source