Results 161 to 170 of about 754,035 (345)

The Theory of Spiral Structure of Galaxies [PDF]

Symposium - International Astronomical Union, 1970
A Landau-type instability mechanism for generating spiral waves is suggested.Two populations of stars, Populations I and II, are considered, the second one with mean rotational velocity zero. Then a dispersion relation is derived which is reduced to the Lin-Shu dispersion relation in the case of vanishing Population II. The amplification of the wave is
openaire   +2 more sources

Investigating the effects of degradation and restoration on face recognition in under‐display cameras

Journal of the Society for Information Display, EarlyView.
Under‐display camera (UDC) enables full‐screen displays but degrades facial recognition accuracy due to diffraction‐induced distortions. This paper introduces three UDC face recognition datasets generated using a GAN trained on synthetic and real‐world images with flares.
Kyusu Ahn, Chanwoo Park, Jaejin Lee
wiley   +1 more source

JWST Reveals Bulge-dominated Star-forming Galaxies at Cosmic Noon

The Astrophysical Journal Letters
Hubble Space Telescope imaging shows that most star-forming galaxies at cosmic noon—the peak of cosmic star formation history—appear disk-dominated, leaving the origin of the dense cores in their quiescent descendants unclear.
Chloë E. Benton, Erica J. Nelson, Tim B. Miller, Rachel Bezanson, Justus Gibson, Abigail I Hartley, Marco Martorano, Sedona H. Price, Katherine A. Suess, Arjen van der Wel, Pieter van Dokkum, John R. Weaver, Katherine E. Whitaker   +12 more
doaj   +1 more source

Anti‐Pseudomonas Aeruginosa Bacteriophage Loaded Electrospun Fibers for Antibacterial Wound Dressings

Macromolecular Rapid Communications, EarlyView.
Multidrug resistant Pseudomonas (P.) aeruginosa is detected in many infected wounds and is challenging to treat with antibiotics. As an alternative, this work incorporates anti‐P. aeruginosa Neko phages into electrospun fibres to explore their potential for treating infected wounds.
Tian Ju, Jixuan Li, Andrew Weston, Giovanni Satta, Sara Bolognini, Mariagrazia Di Luca, Simon Gaisford, Gareth R. Williams   +7 more
wiley   +1 more source

Distribution and Kinematics of Classical Cepheids in the Galactic Outer Ring

Open Astronomy, 2015
The existence of an outer ring in the Galaxy can explain the kinematics of OB associations in the Perseus and Sagittarius stellar-gas complexes. Moreover, it can also explain the orientation of the Carina arm with respect to the major axis of the bar. We
Mel’nik A. M., Rautiainen P., Berdnikov L. N., Dambis A. K., Rastorguev A. S.   +4 more
doaj   +1 more source

Spiral Structures of Disk Galaxies as Non-Axisymmetric Perturbations [PDF]

, 1969
Satoshi Yabushita
openalex   +1 more source

Anatomy of the Star Formation in a Tidally Disturbed Disk Galaxy: NGC 3718

The Astrophysical Journal
We present a UV, optical, and near-IR study of the star-forming complexes in the nearby peculiar galaxy NGC 3718, using Ultraviolet Imaging telescope, Galaxy Evolution Explorer, Spitzer, and DECam Legacy Survey imaging data.
Chandan Watts, Mousumi Das, Sudhanshu Barway   +2 more
doaj   +1 more source

On the Possibility of Determining the Distance to the Galactic Center from the Geometry of Spiral Arm Segments

Open Astronomy, 2015
A new approach to determining the solar galactocentric distance, R0, from the geometry of spiral-arm segments is proposed. Geometric aspects of the problem are analyzed and a simplified three-point method for estimating R0 from objects in a spiral ...
Nikiforov I. I., Veselova A. V.
doaj   +1 more source

Comparison of HI spiral pattern by optical structure of other galaxies [PDF]

, 1964
G. de Vaucouleurs
openalex   +1 more source

Homochiral Self‐Sorting During Macrocycle Formation and their Chiroptical Properties

ChemistryOpen, EarlyView.
Imine condensation of C2‐symmetric chiral aldehydes with aliphatic amines results in 2 : 2 macrocycles lacking self‐sorting, whereas aromatic amines yield macrocycles with complete homochiral self‐sorting. These macrocycles exhibit unique chiroptical properties attributed to rigidification compared to the starting aldehydes.
Diptiprava Sahoo, Soumen De
wiley   +1 more source