Results 121 to 130 of about 29,884 (299)

Activity and rotation of the X-ray emitting Kepler stars [PDF]

, 2017
The relation between magnetic activity and rotation periods in late-type stars provides fundamental information on the stellar dynamo and spin evolution.
Marelli, M., MICELA, Giuseppina, Belfiore, A., Salvetti, D., DE LUCA, Andrea, PORETTI, Ennio, STELZER, BEATE, Pizzocaro, D.   +7 more
core  

Synchrotron Break Frequencies of Mildly to Highly Relativistic Outflows Observed Off-axis

The Astrophysical Journal
We consider the synchrotron spectrum produced by mildly to highly relativistic collisionless shocks. Simple analytic formulae are derived for the break frequencies (peak frequency, self-absorption frequency, synchrotron, and inverse Compton cooling ...
Gilad Sadeh
doaj   +1 more source

Uniform Amorphization of Crystalline Silicon Surfaces Enabled by Deep Ultraviolet Femtosecond Laser Pulses

Advanced Engineering Materials, EarlyView.
Deep‐UV (258 nm) femtosecond pulses enable uniform amorphous silicon writing on Si(100)/(111) with a six‐fold larger fluence amorphization window than NIR methods. Optimized fluence and overlap yield 20–45 nm uniform and continuous amorphous layers. Microscopy shows sharp interfaces, and real‐time reflectivity reveals nanosecond melt–resolidification ...
Wissal Benali, Magali Gregoire, Matys Guyard, Tatiana Itina, David Grojo, Pol Sopeña   +5 more
wiley   +1 more source

An X-ray shadowgraph to locate transient high-energy celestial sources [PDF]

, 1975
A new technique has been developed to locate strong, transient X-ray sources such as the recently discovered gamma ray bursts. The instrument, termed a shadowgraph, locates sources by detecting the X-ray shadow cast by a large occulting mask pattern on ...
Gregory, J. C., Rygg, T. A., Parnell, T. A., Fishman, G. J.   +3 more
core   +1 more source

Millinovae: a new class of transient supersoft X-ray sources without a classical nova eruption [PDF]

Some accreting binary systems containing a white dwarf (such as classical novae or persistent supersoft sources) are seen to emit low-energy X-rays with temperatures of ∼ 106 K and luminosities exceeding 1035 erg s−1.
Mróz, Przemek, Król, Krzysztof, Buckley, David A. H., Mróz, Mateusz J., Iwanek, Patryk, Wrona, Marcin, Page, Kim L., Pietrukowicz, Paweł, Gromadzki, Mariusz, Skowron, Jan, Szegedi, Hélène, Dewangan, Gulab, Kozłowski, Szymon, Udalski, Andrzej, Rybicki, Krzysztof, Meintjes, Pieter, Soszyński, Igor, Charles, Philip, Szymański, Michał K., et al., Poleski, Radosław, Ulaczyk, Krzysztof   +21 more
core   +3 more sources

EP240414a: A Gamma-Ray Burst Jet Weakened by an Extended Circumstellar Material

The Astrophysical Journal Letters
The recent Einstein Probe (EP) event EP240414a exhibits several unusual observational features. Its prompt and afterglow emissions place it between long gamma-ray bursts (LGRBs) and low-luminosity GRBs (LLGRBs).
Hamid Hamidani, Yuri Sato, Kazumi Kashiyama, Masaomi Tanaka, Kunihito Ioka, Shigeo S. Kimura   +5 more
doaj   +1 more source

Superlubricity and Corrosion Inhibition Properties of Solvate Ionic Liquids in Hybrid Carbon Fiber Reinforced Plastic–Steel Interfaces

Advanced Engineering Materials, EarlyView.
Solvate ionic liquids lubrication reduced the coefficient of friction by ∼60% compared to dry sliding, reaching steady‐state values as low as 0.04–0.05. Corrosion weight‐loss measurements in 1 M HCl further demonstrated significant inhibition behavior, with only 100 ppm of [Li(G3)][TFSI] (∼68.5 μL/L) reducing corrosion‐product weight loss by 63 ...
Sameh Dabees, Timothy Harte, Bhagya Dharmasiri, Y. Athulya Wickramasingha, David J. Hayne, Daniel J. Eyckens, Luke C. Henderson   +6 more
wiley   +1 more source

High-resolution spectral analysis of transient pulsars in the Small Magellanic Cloud [PDF]

, 2017
At low energies the spectra of several X-ray binary pulsars show a significant excess over the main power-law component. Although various physical processes (both thermal and non-thermal) have been invoked to produce this excess, its origin is still ...
MEREGHETTI, Sandro, Esposito, P., Tiengo, A., Pintore, Fabio, LA PALOMBARA, NICOLA, SIDOLI, Lara   +5 more
core  

Search for the Optical Counterpart of Einstein Probe–discovered Fast X-Ray Transients from the Lulin Observatory

The Astrophysical Journal Supplement Series
The launch of the Einstein probe (EP) mission has revolutionized the detection and follow-up observations of fast X-ray transients (FXTs) by providing prompt and timely access to their precise localizations.
Amar Aryan, Ting-Wan Chen, Sheng Yang, James H. Gillanders, Albert K. H. Kong, S. J. Smartt, Heloise F. Stevance, Yi-Jung Yang, Aysha Aamer, Rahul Gupta, Lele Fan, Wei-Jie Hou, Hsiang-Yao Hsiao, Amit Kumar, Cheng-Han Lai, Meng-Han Lee, Yu-Hsing Lee, Hung-Chin Lin, Chi-Sheng Lin, Chow-Choong Ngeow, Matt Nicholl, Yen-Chen Pan, Shashi Bhushan Pandey, Aiswarya Sankar.K, Shubham Srivastav, Guanghui Sun, Ze-Ning Wang   +26 more
doaj   +1 more source

All‐in‐One Analog AI Hardware: On‐Chip Training and Inference with Conductive‐Metal‐Oxide/HfOx ReRAM Devices

Advanced Functional Materials, EarlyView.
An all‐in‐one analog AI accelerator is presented, enabling on‐chip training, weight retention, and long‐term inference acceleration. It leverages a BEOL‐integrated CMO/HfOx ReRAM array with low‐voltage operation (<1.5 V), multi‐bit capability over 32 states, low programming noise (10 nS), and near‐ideal weight transfer.
Donato Francesco Falcone, Victoria Clerico, Wooseok Choi, Tommaso Stecconi, Folkert Horst, Laura Bégon‐Lours, Matteo Galetta, Antonio La Porta, Nikhil Garg, Fabien Alibart, Bert Jan Offrein, Valeria Bragaglia   +11 more
wiley   +1 more source