Results 51 to 60 of about 50,208 (269)

The NH Distribution of Hard X-Ray Selected Active Galactic Nuclei in the NEP Field

The Astrophysical Journal
X-ray surveys are one of the most unbiased methods for detecting Compton-thick (CT; N _H ≥ 10 ^24 cm ^−2 ) active galactic nuclei (AGN), which are thought to comprise up to 60% of AGN within z ≲ 1.0.
Samantha Creech, Francesca Civano, Daniel R. Wik, Ross Silver, Xiurui Zhao, Rafael Ortiz III, Tonima Ananna, Norman A. Grogin, Rolf Jansen, Anton M. Koekemoer, Christopher N.A. Willmer, Rogier A. Windhorst   +11 more
doaj   +1 more source

Aptamer Engineering: Strategies for Discovering Functional Nucleic Acids for Next‐Generation Diagnostics and Biosensing

Advanced Science, EarlyView.
The advent of aptamers has highlighted their potential as alternatives to antibodies, overcoming limitations of structural instability and production cost. However, conventional approaches such as SELEX remain slow and labor‐intensive. This review examines recent advances in aptamer engineering, emphasizing in vitro and AI‐driven in silico strategies ...
John V. L. Nguyen, Ahlem Meziadi, Cyrill Brunner, Maureen McKeague, Lidija Malic, Maryam Tabrizian   +5 more
wiley   +1 more source

X-ray Observations of Active Galactic Nuclei in the Cosmological Context

Astrophysics and Space Science, 1998
We review recent discoveries of obscured Active Galactic Nuclei at significant redshifts with X-ray observations. Most, if not all, the X-ray luminous galaxies found at faint X-ray fluxes could in fact be obscured AGN, where the obscuring material is also forming stars copiously. Given that AGN of various types appear to dominate the source populations
Barcons, Xavier, Carballo, R., Carrera, Francisco J., Ceballos, María Teresa, González-Serrano, José Ignacio, Fabian, A.C., Warwick, R. S.   +6 more
openaire   +2 more sources

Heavy X‐Ray Absorption in Soft X‐Ray–weak Active Galactic Nuclei [PDF]

The Astrophysical Journal, 2001
30 pages, 10 figures, LaTeX, uses aaspp4.sty; submitted to ...
Gallagher, S. C., Brandt, W. N., Laor, A., Elvis, M., Mathur, S., Wills, Beverley J., Iyomoto, N.   +6 more
openaire   +2 more sources

Spin Matters: A Multidisciplinary Roadmap to Understanding Spin Effects in Oxygen Evolution Reaction During Water Electrolysis

Advanced Energy Materials, EarlyView.
This roadmap offers a forward‐looking perspective on spin enhancement in the oxygen evolution reaction. It highlights how combining systematic experiments, advanced computational modeling, and novel magnetic, chiral, or hybrid materials can deepen the understanding of spin‐dependent catalytic mechanisms.
Emma van der Minne, Priscila Vensaus, Vadim Ratovskii, Seenivasan Hariharan, Jan Behrends, Cesare Franchini, Jonas Fransson, Sarnjeet S. Dhesi, Felix Gunkel, Florian Gossing, Georgios Katsoukis, Ulrike I. Kramm, Magalí Lingenfelder, Qianqian Lan, Yury V. Kolen'ko, Yang Li, Ramsundar Rani Mohan, Jeffrey McCord, Lingmei Ni, Eva Pavarini, Rossitza Pentcheva, David H. Waldeck, Michael Verhage, Anke Yu, Zhichuan J. Xu, Piero Torelli, Silvia Mauri, Narcis Avarvari, Anja Bieberle‐Hütter, Christoph Baeumer   +29 more
wiley   +1 more source

Self‐Healing Materials from Electronically Integrated Microscopic Robots

Advanced Intelligent Systems, EarlyView.
Submillimeter robots can use electronically controlled electrodeposition to assemble into a material structure. The resulting aggregate possesses ultralow density, high strength‐to‐weight ratio, and can heal from damage. Further afield, these results clear a path to materials that organize or adapt by directing matter and information at the microscale.
Lucas C. Hanson, William H. Reinhardt, Marc Z. Miskin   +2 more
wiley   +1 more source

Time-evolving Diagnostic of the Ionized Absorbers in NGC 4051. I. High-resolution Time-averaged Spectroscopy

The Astrophysical Journal
We present a high-resolution X-ray spectroscopic study of the narrow-line Seyfert 1 galaxy NGC 4051 using two XMM-Newton high-resolution Reflection Grating Spectrometer observations.
Roberto Serafinelli, Fabrizio Nicastro, Alfredo Luminari, Yair Krongold, Francesco Camilloni, Elias Kammoun, Riccardo Middei, Enrico Piconcelli, Luigi Piro   +8 more
doaj   +1 more source

The hard X-ray view of bright infrared galaxies

, 2009
Aims. The synthesis of the cosmic X-ray background (CXB) requires a large population of Compton-thick active galactic nuclei that have not been detected so far.
Akylas, Armus, Barger, Bassani, Courvoisier, Dadina, de Rosa, Franceschini, Genzel, Gilli, Gondoin, González-Martín, Grimm, Guainazzi, Kawakatu, Kennicutt, La Franca, Lebrun, Lynden-Bell, Matt, Mushotzky, N. Cabral, Paltani, R. Walter, Risaliti, Risaliti, Sanders, Schmidt, Setti, Terashima, Tozzi, Tueller, Ubertini, Vega, Vignati, Walter, Watabe, Wilkes, Wilkes, Zdziarski   +39 more
core   +1 more source

Mechanistic Understanding of Laser‐Induced Defect Engineering of Anisotropic Cobalt Oxide Spinel Platelets in Water

ChemCatChem, EarlyView.
Pulsed laser defect engineering in liquid (PUDEL) modifies anisotropic Co3O4 platelets by inducing lattice distortions and defects while enriching {111} surfaces with hydroxyl groups and tunes the catalytic activity of the Co3O4 platelets in electrocatalytic oxygen evolution and thermocatalytic selective oxidation reactions.
Dana Schellenburg, Thomas Bihnam, Carsten Placke‐Yan, Georg Bendt, Oleg Prymak, Takuma Sato, Dylan Jennings, Catalina Leiva‐Leroy, Dongsheng Zhang, Milen Nachev, Kapil Dhaka, Falonne Nkou, Ulrich Hagemann, Markus Heidelmann, Stephane Kenmoe, Kai S. Exner, Bernd Sures, Martin Muhler, Christian H. Liebscher, Alexander Schnegg, Stephan Schulz, Stephan Barcikowski, Sven Reichenberger   +22 more
wiley   +1 more source

Investigating Model Dependencies for Obscured Active Galactic Nuclei: A Case Study of NGC 3982

The Astrophysical Journal
X-ray spectroscopy of heavily obscured active galactic nuclei (AGN) offers a unique opportunity to study the circumnuclear environment of accreting supermassive black holes.
Kristína Kallová, Peter G. Boorman, Claudio Ricci   +2 more
doaj   +1 more source