Results 81 to 90 of about 67,629 (216)

Towards an Algorithmic Guide to Spiral Galaxies [PDF]

Theoretical Computer Science, 2014
In this paper, we are interested in the one-player game Spiral Galaxies, and study it from an algorithmic viewpoint. Spiral Galaxies has been shown to be NP-hard [Friedman, 2002] more than a decade ago, but so far it seems that no one has dared exploring its algorithmic universe. We take this trip and visit some of its corners.
Guillaume Fertin, Shahrad Jamshidi, Christian Komusiewicz   +2 more
openaire   +3 more sources

Global Spiral Modes in NGC 1566: Observations and Theory [PDF]

, 2000
We present an observational and theoretical study of the spiral structure in galaxy NGC 1566. A digitized image of NGC 1566 in I-band was used for measurements of the radial dependence of amplitude variations in the spiral arms. We use the known velocity
B. A. Peterson, Bertin G., Bottema R., Bottema R., James R. A., Korchagin V., Lacey C. G., Lin C. C., Lynden-Bell D., Marochnik L. S., Mishurov Yu. N., N. Kikuchi, N. Orlova, S. M. Miyama, Theis Ch., V. Korchagin, van der Kruit P. C., Vauterin P.   +17 more
core   +3 more sources

Spatial Analysis of Tropical Cyclone Precipitation Through Landfall: A Multi‐Basin Perspective

Meteorological Applications, Volume 33, Issue 3, May/June 2026.
We use a shape metric methodology to analyze the spatial evolution of tropical cyclone (TC) precipitation across the North Indian, Western Pacific, and North Atlantic basins. Across all basins, precipitation area decreases from pre‐landfall to post‐landfall, with closure decreasing and dispersion increasing, indicating an exposed TC center and outward ...
Samrin Sumaiya Sauda, Stephanie E. Zick
wiley   +1 more source

Insights into the structure and kinematics of a Milky Way-like galaxy

Astronomy & Astrophysics
Context. Understanding how the large-scale kinematics of the Milky Way (MW) shape the formation and evolution of the interstellar medium remains challenging from an observational perspective, and numerical models that can reproduce the observed structure
Durán-Camacho E., Duarte-Cabral A.
doaj   +1 more source

The 3-Dimensional Structure of NGC 891 and M51

, 2012
We investigate the three-dimensional structure of the nearby edge-on spiral galaxy NGC 891 using 3D Monte Carlo radiative transfer models, with realistic spiral structure and fractally clumped dust.
Andrew Schechtman-Rook, Bianchi, Fioc, Kamphuis, Kenneth Wood, Matthew A. Bershady, Popescu, Popescu, Thomas P. Robitaille, Xilouris   +9 more
core   +1 more source

Tracing PAHs and Warm Dust Emission in the Seyfert Galaxy NGC 1068 [PDF]

, 2007
We present a study of the nearby Seyfert galaxy NGC 1068 using mid- and far- infrared data acquired with the IRAC, IRS, and MIPS instruments aboard the Spitzer Space Telescope.
Aaron S. Evans, Allain T., Barry F. Madore, Ben H. P. Chan, Bernhard Schulz, Bland-Hawthorn J., Catherine M. Ishida, Clavel J., Combes F., David B. Sanders, David T. Frayer, Dong-Chan Kim, Fath E. A., Greg Bothun, Jason A. Surace, Joseph B. Jensen, Joseph M. Mazzarella, Justin H. Howell, Kevin Xu, Lee Armus, Morganti R., P. N. Appleton, Packham C., Roche P. F., Steven Lord, Sylvain Veilleux, Tatjana Vavilkin, Unger S. W., Voit G. M.   +28 more
core   +2 more sources

The Curious Case of CysE: Diversity and Distribution of Serine Acetyltransferases in Bacteria

Proteins: Structure, Function, and Bioinformatics, Volume 94, Issue 5, Page 1092-1103, May 2026.
ABSTRACT Serine acetyltransferase (CysE) is a member of the left‐handed β‐helix family of acetyltransferases that catalyze the rate limiting step in de novo cysteine biosynthesis. There are two isoforms of CysE that differ in length, with the shorter isoform lacking approximately 76 amino acids at the N‐terminus of the protein from the serine ...
Keely E. A. Oldham, Adele K. Williamson, Emily K. Grout, Joanna L. Hicks   +3 more
wiley   +1 more source

Mind and Cosmos as Throughput Systems: A Convergence Through the Throughput Model

Systems Research and Behavioral Science, Volume 43, Issue 3, Page 1212-1228, May/June 2026.
ABSTRACT This paper advances a conceptual and mathematical foundations approach by applying the throughput model (TPM) to cosmic phenomena, reframing the universe as an extended information processing system. TPM's four stages, Perception, Information, Judgement and Decision Choice, are reformulated in explicit information‐theoretic and dynamical ...
Waymond Rodgers
wiley   +1 more source

Quantifying the Unwinding Due to Ram Pressure Stripping in Simulated Galaxies

Galaxies
Galaxies moving through the gas of the intracluster medium (ICM) experience ram pressure stripping, which can leave behind a gas tail. When a disk galaxy receives the wind edge-on, however, the characteristic signature is not a typical jellyfish tail ...
Rubens E. G. Machado, Caroline F. O. Grinberg, Elvis A. Mello-Terencio   +2 more
doaj   +1 more source

Disk Galaxy Models Driven by Stochastic Self-Propagating Star Formation

Open Astronomy, 2010
We present a model of chemical and spectrophotometric evolution of disk galaxies based on a stochastic self-propagating star formation scenario. The model incorporates galaxy formation through the process of accretion, chemical and photometric evolution ...
Mineikis T., Vansevičius V.
doaj   +1 more source