Results 81 to 90 of about 3,892 (249)

Raman analysis of organic refractory materials after energetic processing: Evidence for amorphous carbon on TNOs and comets

Meteoritics &Planetary Science, EarlyView.
Abstract Amorphous carbon (αC) is found in various extraterrestrial particles, including those thought to originate from the outer Solar System. αC can form through two main processes involving C‐rich materials: exposure to energetic charged particles and thermal processing.
M. Germanà, A. Vyjidak, G. A. Baratta, B. M. Giuliano, R. G. Urso, C. Scirè, D. Fulvio, T. Grassi, P. Jusko, P. Caselli, M. E. Palumbo   +10 more
wiley   +1 more source

Nanoscale space weathering features in mature lunar soil revealed by TEM and APT

Meteoritics &Planetary Science, EarlyView.
Abstract Space weathering significantly alters the optical, chemical, and structural properties of lunar regolith at micro‐ and nanoscales; yet detailed nanoscale variability within individual soils remains underexplored. Here we apply transmission electron microscopy (TEM) and atom probe tomography to four mineral grains (olivine, ilmenite, and two ...
Jennika Greer, Alexander M. Kling, Luke Daly, Dieter Isheim, David N. Seidman, Michelle S. Thompson, Philipp R. Heck   +6 more
wiley   +1 more source

Low-surface-brightness spheroidal galaxies as Milgromian isothermal spheres [PDF]

, 2021
I consider a sample of eight pressure-supported low-surface-brightness galaxies in terms of Milgrom's modified Newtonian dynamics (MOND). These objects include seven nearby dwarf spheroidal galaxies - Sextans, Carina, Leo II, Sculptor, Draco, Leo I ...
Sanders, R. H.
core   +1 more source

Visual Icons

Philosophy and Phenomenological Research, EarlyView.
ABSTRACT Philosophers often characterize perception as image‐like. There is little agreement, however, about what constitutes an imagistic or iconic representation. This article identifies five signature properties of iconic representations endorsed in the philosophical and scientific literature: item‐richness, feature‐richness, spatiotemporal ...
Jake Quilty‐Dunn
wiley   +1 more source

The ISM of Low Surface Brightness Galaxies

, 2000
Using Monte Carlo radiative transfer techniques, we model the dust content of the edge-on low surface brightness (LSB) galaxy UGC 7321 and explore the effects of dust on its disk color gradients. Dust alone cannot explain the large radial disk color gradients observed in this galaxy and we find that a significant fraction (~50%) of the dust in UGC 7321
Matthews, L. D., Wood, Kenneth, Gao, Yu
openaire   +2 more sources

Unveiling the Functional Role of KIF21B in Microglia Inflammatory Response

Glia, Volume 74, Issue 9, September 2026.
Microglia express KIF21B in both sexes. KIF21B binds to microglia cytoskeleton; inflammation alters such interaction promoting a phagocytic state in females. In male microglia KIF21B modulates migration. ABSTRACT Microglia are brain immune cells that maintain homeostasis and respond to injury, changing cell morphology to drive inflammation, migration ...
Danny Ganchala, Alvaro Bautista‐Abad, Daniel Pinto‐Benito, Julia Simon‐Areces, Daniela Grassi, Francesco Paolo Ulloa Severino, Maria‐Angeles Arevalo   +6 more
wiley   +1 more source

Gas-rich, Field Ultra-diffuse Galaxies Host Few Gobular Clusters

The Astrophysical Journal Letters, 2022
We present Hubble Space Telescope imaging of 14 gas-rich, low-surface-brightness galaxies in the field at distances of 25–36 Mpc, with mean effective radii and g -band central surface brightnesses of 1.9 kpc and 24.2 mag arcsec ^−2 .
Michael G. Jones, Ananthan Karunakaran, Paul Bennet, David J. Sand, Kristine Spekkens, Burçin Mutlu-Pakdil, Denija Crnojević, Steven Janowiecki, Lukas Leisman, Catherine E. Fielder   +9 more
doaj   +1 more source

Unraveling the Electronic Structure of Silicon Vacancy Centers in 4H‐SiC

Advanced Functional Materials, Volume 36, Issue 58, 20 July 2026.
The electronic structure of the silicon vacancy in 4H‐SiC is probed via transient absorption spectroscopy, uncovering previously inaccessible excited states of the quartet and doublet spin channels, including the V2' transition. In combination with theoretical analysis, a comprehensive picture of the electronic structure is established.
Ali Tayefeh Younesi, Minh Tuan Luu, Christopher Linderälv, Vytautas Žalandauskas, Marianne Etzelmüller Bathen, Nguyen Tien Son, Takeshi Ohshima, Gergő Thiering, Lukas Razinkovas, Ronald Ulbricht   +9 more
wiley   +1 more source

Estimating the Oblateness of Dark Matter Halos Using Neutral Hydrogen Velocity Dispersion

The Astrophysical Journal Letters, 2023
We derive the oblateness parameter q of the dark matter halo of a sample of gas-rich, face-on disk galaxies. We have assumed that the halos are triaxial in shape but their axes in the disk plane ( a and b ) are equal, so that q = c / a measures the halo ...
Mousumi Das, Roger Ianjamasimanana, Stacy S. McGaugh, James Schombert, K. S. Dwarakanath   +4 more
doaj   +1 more source

Giant Low Surface Brightness Galaxies

Bulletin de la Société Royale des Sciences de Liège, 2018
In this paper, we present radio observations of the giant low surface brightness (LSB) galaxies made using the Giant Metrewave Radio Telescope (GMRT). LSB galaxies are generally large, dark matter dominated spirals that have low star formation efficiencies and large HI gas disks.
Das, Mousumi, Mishra, Alka, Kantharia, Nimisha G.   +2 more
openaire   +2 more sources