Results 161 to 170 of about 2,506 (304)

Fluorescence Tuning of Carbon Dots from Red to Blue via UV‐Induced Photochemical Etching

Advanced Science, EarlyView.
A UV‐driven photochemical process enables continuous color evolution of carbon dots from red to blue using a single irradiation parameter. Progressive photoetching restructures graphitic domains and surface states, allowing full visible‐spectrum emission control.
Nanzhi Zheng, Yuchen Yang, Jingwei Xu, Jincheng Gan, Yinuo An, Xinyu Li, Guohua Chen   +6 more
wiley   +1 more source

Be/X-ray transients at low X-ray luminosity [PDF]

, 2019
Accretion is one of the most fundamental mechanisms found in our physical Universe. The study of this phenomenon helps us to understand the behaviour of matter under extreme environments present around compact objects, either neutron stars or black holes.
Rouco Escorial, A.
core  

Trace Ru‐Doped PtCuRu@PtRu Core‐Shell Electrocatalyst for CO‐Resilient Methanol Oxidation

Advanced Science, EarlyView.
We engineered a trace Ru‐doped PtCuRu@PtRu core‐shell nanostructure. This design exploits lattice mismatch‐induced compressive strain between the PtCuRu ternary core and trace Ru‐doped Pt‐rich shell, systematically downshifting the Pt d‐band center to weaken *CO adsorption energetics.
Tianrui Xue, Shiyue Xing, Zhongliang Liu, Yiting Song, Jianyi Zhang, Miaomiao Liu, Huihui Li, Chunzhong Li   +7 more
wiley   +1 more source

Probing the X-ray Reprocessing Geometry in High-Mass X-ray Binaries with the Chandra High Energy Transmission Grating [PDF]

41st Liège International Astrophysical Colloquium on “The eventful life of massive star multiples,” University of Liège (Belgium), 15–19 July 2024A majority of stars reside in multiple systems, and a majority of massive stars appear in binaries.
Yaqoob, Tahir, Tzanavaris, Panayiotis
core   +1 more source

AstroSat and Insight-HXMT Observations of the Long-period X-Ray Pulsar 4U 2206+54

The Astrophysical Journal
We report the timing and spectral studies of the accreting X-ray pulsar 4U 2206+54 using AstroSat and Insight-HXMT observations taken in 2016 and 2020 respectively. X-ray pulsations from the system are detected by both missions. The AstroSat discovered a
Prahlad R. Epili, Wei Wang
doaj   +1 more source

Discovery of High X-Ray Polarization from the Neutron Star Low-mass X-Ray Binary Cyg X-2 on the Horizontal Branch

The Astrophysical Journal
Abstract We present results from simultaneous X-ray polarimetric and spectroscopic observations of the bright neutron star low-mass X-ray binary Cyg X-2, performed by the Imaging X-ray Polarimetry Explorer (IXPE) and the Nuclear Spectroscopic Telescope Array. IXPE detected significant polarization (15
Andrea Gnarini, Swati Ravi, Philip Kaaret, Anna Bobrikova, Juri Poutanen, Sofia V. Forsblom, Francesco Ursini, Maria Cristina Baglio, Stefano Bianchi, Fiamma Capitanio, Massimo Cocchi, María Alejandra Díaz Teodori, Sergio Fabiani, Ruben Farinelli, Giorgio Matt, Mason Ng, Alexander Salganik, Paolo Soffitta, Antonella Tarana, Silvia Zane   +19 more
openaire   +2 more sources

Backbone‐Length‐Optimized Inhibitors Deliver Long‐Retention Selectivity in Area‐Selective ALD of VO2

Advanced Science, EarlyView.
Area‐selective VO2 ALD is found to depend critically on inhibitor backbone length, which governs physisorption, chemisorption stability, and packing efficiency in a coupled manner. An intermediate backbone‐length achieves the best long‐retention selectivity, establishing a chemically and geometrically grounded design principle for small‐molecule ...
Hae Lin Yang, Eun Chong Cho, Minchan Kim, Hye In Park, Ga‐young Lee, Seunghwan Lee, Beomseok Kim, Changhwa Jung, Youngkwon Kim, Jin‐Seong Park   +9 more
wiley   +1 more source

Variable X-Ray Sources Associated with Extragalactic Supernova Remnants

The Astrophysical Journal
We report a serendipitous and unexpected discovery from a study of long-term X-ray variability in the nearby galaxy M83: a substantial fraction of X-ray sources classified as supernova remnants (SNRs) exhibit significant variability.
Andrea H. Prestwich, Francis Primini, Roy E. Kilgard, Nanda Rea, Michael L. McCollough   +4 more
doaj   +1 more source

A Data‐Driven Inverse Design Methodology for Magnetic Soft Millirobots Navigating in Confined Spaces

Advanced Science, EarlyView.
A data‐efficient inverse design framework automates the optimization of magnetic soft millirobots for confined‐space navigation. Integrating a physics‐based Cosserat rod model with Bayesian optimization efficiently identifies high‐performance geometries.
Ziyu Ren, Hong Wang, Chak Wang Tse, Yi Zheng, Xi Chen, Wenqi Hu   +5 more
wiley   +1 more source

Superorbital Phase Evolution and a Soft–Hard X-Ray Phase Shift in LMC X-4

The Astrophysical Journal
The superorbital period of LMC X-4 is among the most stable known in Roche-lobe overflow, high-mass X-ray binaries. We analyzed 33 yr of monitoring data from the Compton Gamma Ray Observatory Burst and Transient Source Experiment, the Rossi X-ray Timing ...
Yi Chou
doaj   +1 more source