Results 51 to 60 of about 2,606 (253)

A UV-XUV attosecond beamline with few-femtosecond tunable ultraviolet pump pulses [PDF]

open access: yesEPJ Web of Conferences
Ultrafast charge transfer processes in organic materials which occur in organic materials are fundamental for advancing solar energy conversion technologies.
Colaizzi Lorenzo   +10 more
doaj   +1 more source

A burst model for line emission in the solar atmosphere. II - Coronal extreme ultraviolet lines

open access: yesThe Astrophysical Journal, 1992
We review the spectroscopic evidence for explosive events, hereafter referred to as bursts, occurring in solar coronal plasmas. Problems in the interpretation of extreme ultraviolet spectra from Mg-like ions, particularly Fe XV in solar flares can be obviated to certain extent if these ions are produced in an ionizing plasma, with the 3s3p 3 P levels ...
U. Feldman   +4 more
openaire   +1 more source

3D Printing of Soft Robotic Systems: Advances in Fabrication Strategies and Future Trends

open access: yesAdvanced Robotics Research, EarlyView.
Collectively, this review systematically examines 3D‐printed soft robotics, encompassing material selections, function integration, and manufacturing methodologies. Meanwhile, fabrication strategies are analyzed in order of increasing complexity, highlighting persistent challenges with proposed solutions.
Changjiang Liu   +5 more
wiley   +1 more source

Extreme-ultraviolet Polarimetric Diagnostics of the Solar Corona: The Hanle Effect of Ne viii 770 Å

open access: yesThe Astrophysical Journal
Magnetic fields are the primary driver of the plasma thermodynamics in the upper solar atmosphere, especially in the corona. However, magnetic field measurements in the solar corona are sporadic, thereby limiting us from the complete understanding of ...
Raveena Khan   +3 more
doaj   +1 more source

A Possible Mechanism for the “Late Phase” in Stellar White-light Flares

open access: yesThe Astrophysical Journal, 2023
M dwarf flares observed by the Transiting Exoplanet Survey Satellite (TESS) sometimes exhibit a peak-bump light-curve morphology, characterized by a secondary, gradual peak well after the main, impulsive peak.
Kai E. Yang   +3 more
doaj   +1 more source

Perspective: Hollow Core Optical Fibres for Ultraviolet and Visible Wavelengths

open access: yesAdvanced Science, EarlyView.
Hollow core optical fibres bypass material constraints that limit optical fibres at ultraviolet and visible wavelengths. However, their challenging fabrication has limited their development, and significant gains in performance remain possible. In this perspective we outline approaches to enable the next generation of fibres for shorter wavelengths ...
Robbie Mears   +5 more
wiley   +1 more source

Time-dependent Hinode/EIS Atlas of a Coronal Mass Ejection Containing Cool Material

open access: yesThe Astrophysical Journal
We report the first time-dependent spectral atlas of a coronal mass ejection (CME) observed by the Hinode/Extreme Ultraviolet Imaging Spectrometer (EIS).
E. M. Wraback   +2 more
doaj   +1 more source

Pixel-to-pixel Translation of Solar Extreme-ultraviolet Images for DEMs by Fully Connected Networks

open access: yesThe Astrophysical Journal Supplement Series, 2023
In this study, we suggest a pixel-to-pixel image translation method among similar types of filtergrams such as solar extreme-ultraviolet (EUV) images. For this, we consider a deep-learning model based on a fully connected network in which all pixels of ...
Eunsu Park   +8 more
doaj   +1 more source

Direct measurements of impulsive extreme ultraviolet and hard X-ray solar flare emission

open access: yesThe Astrophysical Journal, 1982
Direct, simultaneous measurements of the 100--1030 A EUV and 15--150 keV X-ray emission during solar flares having impulse phases are reported. Time histories of the energy fluxes and flux ratios for three flares were obtained from Solrad 11 satellite data.
D. M. Horan, R. W. Kreplin, G. G. Fritz
openaire   +1 more source

Flexoelectricity in Photoconversion: Fundamentals, Materials, and Outlooks

open access: yesAdvanced Science, EarlyView.
Mechanical bending of a flexible cantilever induces a strain gradient in the photoactive material. The resulting flexoelectric field couples with photovoltaic and photoconductive effects, modulating charge generation, separation, and collection. A comparative analysis of oxide perovskites, halide perovskites, and two‐dimensional materials is presented,
Xiang Huang, Feng Li, Rongkun Zheng
wiley   +1 more source

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