Results 51 to 60 of about 167,153 (243)

Amplitude scintillation detection with geodetic GNSS receivers leveraging machine learning decision tree

Satellite Navigation
The amplitude scintillation detection is typically achieved by using the scintillation index generated by dedicated and costly ionospheric scintillation monitoring receivers (ISMRs).
Wang Li, Yiping Jiang, Hongyuan Ji, Wenqiang Wei   +3 more
doaj   +1 more source

Interaction of plasma drifts: A hypothesis for equatorial spread F occurrence

Journal of Space Weather and Space Climate
Studies on the generation mechanisms of post-sunset ionospheric irregularities, which constitute a threat to trans-ionospheric radio propagation, particularly at the African sector, are quite sparse.
Oyeyemi Elijah Oyedola, Olugbon Busola, Akala Andrew Oke-Ovie, Kashcheyev Anton, Rabiu Akeem Babatunde, Odeyemi Olumide Odeyinka   +5 more
doaj   +1 more source

Microfluidic Gratings for X‐Ray Phase Contrast Imaging

Advanced Science, EarlyView.
This work establishes a new protocol for the fabrication of X‐ray gratings that exploits the advantages of microfluidics and enables a more inexpensive, faster, and scalable production process. These X‐ray devices are fundamental for implementing X‐ray phase contrast imaging (XPCI) in laboratory and clinical settings, yet their costly and complex ...
Alessandro Rossi, Antonio Ferraro, Francesco Coccimiglio, Tiziana Ritacco, Alberto Astolfo, Michele Giocondo, Vincenzo Formoso, Raffaele Giuseppe Agostino, Francesco Iacoviello, Ioannis Papakonstantinou, Alessandro Olivo   +10 more
wiley   +1 more source

Auroral Amplitude Scintillations Revealed With High‐Rate Scintillation Indices From a GNSS Array

Space Weather
As Global Navigation Satellite Signals pass through the ionosphere, particularly at high latitudes, they can refract and diffract, resulting in a phenomenon known as scintillation.
G. Blinstrubas, S. Datta‐Barua
doaj   +1 more source

Towards the possibility to combine LOFAR and GNSS measurements to sense ionospheric irregularities

Journal of Space Weather and Space Climate, 2023
Inhomogeneities within the ionospheric plasma density affect trans-ionospheric radio signals, causing radio wave scintillation in the amplitude and phase of the signals.
Flisek Paweł, Forte Biagio, Fallows Richard, Kotulak Kacper, Krankowski Andrzej, Bisi Mario, Mevius Maaijke, Froń Adam, Tiburzi Caterina, Soida Marian, Śmierciak Bartosz, Grzesiak Marcin, Matyjasiak Barbara, Pożoga Mariusz, Dąbrowski Bartosz, Mann Gottfried, Vocks Christian, Zucca Pietro, Błaszkiewicz Leszek   +18 more
doaj   +1 more source

Reversible, Chemically Gated FRET via Ligand‐Activated Acceptors

Advanced Science, EarlyView.
Fluorogen binding turns the compact FAST tag into a tunable FRET acceptor, with ligand chemistry programming spectral overlap and excited‐state lifetimes. Fluorescence‐lifetime imaging reads out energy transfer through the shortened donor lifetime, while simply adding or washing out the dye switches FRET on and off, reversibly mapping the supramodular ...
Nivedita Singh, Smruti Ranjan Nayak, Sanjay Kumar Mohanty, Aishwarya Hanumantharaju, Amala Shaju, Mini Jose, Aravind Penmatsa, Deepak Nair   +7 more
wiley   +1 more source

Supramolecular Enforcement of Planar Tetracoordinate Halides

Angewandte Chemie, EarlyView.
A calix[4]pyrrolato‐indium scaffold preorganizes Li4 pockets that trap Cl−, Br−, and I− in strongly flattened to square‐planar tetracoordinate environments. Computations reveal low planarization energies for the heavier halides, while crystallography shows that their geometry is readily modulated by subtle supramolecular and packing effects ...
Jie Zhang, Avijit Maiti, Lutz Greb
wiley   +2 more sources

Minimum-Entropy Autofocusing Based on Re-PSO for Ionospheric Scintillation Mitigation in P-Band SAR Imaging

IEEE Access, 2019
The spaceborne synthetic aperture radar (SAR) system working at P-band, is vulnerable to the ionospheric effect. The ionospheric scintillation will introduce random phase fluctuations into the SAR signal and deteriorate the imaging performance.
Lei Yu, Yongsheng Zhang, Qilei Zhang, Yifei Ji, Zhen Dong   +4 more
doaj   +1 more source

Smartphone‐Guided Visible Light Modulation of RSNOs for Antimicrobial Activity via Controlled Nitric Oxide Release

Advanced Science, EarlyView.
A light‐activated catheter insert combines antimicrobial blue light with nitric oxide release to generate complementary oxidative and nitrosative stress, producing potent broad‐spectrum antimicrobial activity. The approach achieves greater than 4‐log reductions in bacterial and fungal viability and significantly reduces Staphylococcus aureus ...
Alexander Bruckmann, Adam Brooks Goodman, Myddelton C. Parker, Mark Garren, Ji Eun Park, Chad Schmiedt, Hitesh Handa, Elizabeth J. Brisbois   +7 more
wiley   +1 more source

Operando X‐Ray Micro‐Imaging Reveals Spatiotemporal Evolution of the Oxidation State of Nickel During Dry Methane Reforming

Angewandte Chemie, EarlyView.
Operando X‐ray micro‐imaging enables quantitative determination of spatially resolved nickel redox rates during the process of dry reforming of methane and its subsequent regeneration. The support composition governs the local nickel redox dynamics, thereby exhibiting different local nickel reduction and oxidation rates. The spatiotemporal Ni oxidation
Sofie Ferwerda, Valerie Briois, Anthony Beauvois, Sebastian Weber, Nils Bottke, Matteo Monai, Bert M. Weckhuysen   +6 more
wiley   +2 more sources