Results 61 to 70 of about 217,086 (193)

Active Nematics Reinforce the Ratchet Flow in Dense Environments Without Jamming

Advanced Science, Volume 12, Issue 11, March 20, 2025.
This study demonstrates enhanced directional migration of neural progenitor cells in micro‐fabricated ratchet geometry, taking advantage of active collective motions. Jamming is eased by cells' spontaneous back‐and‐forth motion as active nematics, answering the long‐standing puzzle of how cells navigate crowded environments over long distances.
Yisong Yao, Zihui Zhao, He Li, Yongfeng Zhao, H. P. Zhang, Masaki Sano   +5 more
wiley   +1 more source

Multiwavelength Properties of Infrared-faint Radio Sources Based on Analysis of Their Spectral Energy Distribution

The Astrophysical Journal
Infrared-faint radio sources (IFRSs) are believed to be a rare class of radio-loud active galactic nuclei (AGNs) characterized by their high radio-to-infrared flux density ratios of up to several thousand.
Yihang Zhang, Lulu Fan, Tao An, Jun Yang, Weibin Sun, Haoran Yu, Yunkun Han   +6 more
doaj   +1 more source

Conference Summary: The Central Engine of Active Galactic Nuclei [PDF]

arXiv, 2007
The 2006 meeting in Xi'an on the Central Engine of Active Galactic Nuclei covered the enormous and continuously expanding area of AGN research, from theory to the most sophisticated observations and from gamma-ray energies to long radio wavelengths.
arxiv  

A search for FRB 121102-like persistent radio-luminous sources -- Candidates and implications for the FRB rate and searches [PDF]

, 2017
The localization of the repeating fast radio burst (FRB), FRB 121102, suggests that it is associated with a persistent radio-luminous compact source in the FRB host galaxy. Using the FIRST radio catalog, I present a search for luminous persistent sources in nearby galaxies, with radio luminosities >10% of the FRB 121102 persistent source luminosity ...
arxiv   +1 more source

Antiferroelectric Order in Nematic Liquids: Flexoelectricity Versus Electrostatics

Advanced Science, Volume 12, Issue 9, March 6, 2025.
This study examines the competing roles of flexoelectric and electrostatic effects in governing the formation and structure of antiferroelectric nematic liquids. By adjusting the local electric field, the interplay between these mechanisms is analyzed, revealing that flexoelectric coupling is the primary mechanism for the emergence of antiferroelectric
Peter Medle Rupnik, Ema Hanžel, Matija Lovšin, Natan Osterman, Calum Jordan Gibb, Richard J. Mandle, Nerea Sebastián, Alenka Mertelj   +7 more
wiley   +1 more source

BASS. XLVII. 22 GHz Radio Atlas of Swift-BAT Selected AGN

The Astrophysical Journal
We present the third phase of the largest high-frequency, high-resolution imaging survey of 231 nearby, hard X-ray selected active galactic nuclei (AGNs), with a very high 98% ± 1% detection fraction.
Macon Magno, Krista L. Smith, O. Ivy Wong, Richard Mushotzky, Stuart Vogel, Michael J. Koss, Claudio Ricci, Kyuseok Oh, Chin-Shin Chang, Loreto Barcos-Muñoz, Franz E. Bauer, Alessandro Peca, Darshan Kakkad, Turgay Caglar, Benny Trakhtenbrot, Fiona Harrison, Daniel Stern, C. Megan Urry, Merry Powell   +18 more
doaj   +1 more source

The Evolution of Radio Loud Active Galactic Nuclei as a Function of Black Hole Spin [PDF]

, 2010
Recent work on the engines of active galactic nuclei jets suggests their power depends strongly and perhaps counter-intuitively on black hole spin. We explore the consequences of this on the radio-loud population of active galactic nuclei and find that the time evolution of the most powerful radio galaxies and radio-loud quasars fits into a picture in ...
arxiv   +1 more source

Meridional Distribution of CO, H2O, and H2SO4 in the Venus' Atmosphere: A Two‐Dimensional Model Incorporating Transport and Chemical Reaction

Journal of Geophysical Research: Planets, Volume 130, Issue 3, March 2025.
Abstract We developed a 2‐dimensional model of Venus' atmosphere which calculates meridional distributions of chemical species such as CO, H2 ${\mathrm{H}}_{2}$O, and H2SO4 ${\mathrm{H}}_{2}{\text{SO}}_{4}$. To calculate the meridional distribution of chemically active species, we combined chemical model, cloud model, and transport model.
Shinya Kuwayama, George L. Hashimoto
wiley   +1 more source

Prevalence of Compact Nuclear Radio Emission in Post-merger Galaxies and Its Origin

The Astrophysical Journal
Post-merger galaxies are unique laboratories to study the triggering and interplay of star formation and active galactic nucleus (AGN) activity. Combining new, high-resolution Jansky Very Large Array (VLA) observations with archival radio surveys, we ...
Gregory Walsh, Sarah Burke-Spolaor
doaj   +1 more source

The role of DNA content in shaping chromatin architecture and gene expression

The Plant Journal, Volume 121, Issue 6, March 2025.
SUMMARY Whole‐genome duplication is an evolutionary force that drives speciation in all living kingdoms and is notably prevalent in plants. The evolutionary history of plants involved at least two genomic duplications that significantly expanded the plant morphology and physiology spectrum. Many important crops are polyploids, showing valuable features
Alfonso Carlos Barragán‐Rosillo, Ricardo A. Chávez Montes, Luis Herrera‐Estrella   +2 more
wiley   +1 more source