Results 41 to 50 of about 553,609 (298)

When Poor Exciton Dissociation Limits Photocurrents in Organic Solar Cells: Why Low Offset Non‐Fullerene Acceptor Blends Can't Be Efficient

Advanced Materials, EarlyView.
The energetic offset between the donor and the acceptor components in organic photoactive layers is central to the tradeoff between photovoltage and photocurrent losses. This Perspective covers the most important issues surrounding this topic in non‐fullerene acceptor blends, from the difficulty of accurately determining state energies and driving ...
Dieter Neher, Manasi Pranav
wiley   +1 more source

Back-illuminated Light-spot-mapping Algorithm for Dual Rotation Robotic Fiber Positioners Based on an Artificial Probability Potential Field Method

The Astronomical Journal
Back-illuminated spot mapping is essential for observations with modern spectroscopic survey telescopes. In the fiber position detection system, after the fiber view camera (FVC) detects the positions of the light spots from the robotic fiber positioners
Yingfu Wang, Jiahao Zhou, Ziming Liu, Rongfeng Chen, Jiacheng Xie, Hongzhuan Hu, Jianping Wang, Zhigang Liu, Jiaru Chu, Feifan Zhang, Haotong Zhang, Yong Zhang, Zengxiang Zhou   +12 more
doaj   +1 more source

Stable Fiber-illumination for Extremely Precise Radial Velocities with NEID

The Astronomical Journal, 2023
NEID is a high-resolution red–optical precision radial velocity (RV) spectrograph recently commissioned at the WIYN 3.5 m telescope at Kitt Peak National Observatory, Arizona, USA.
Shubham Kanodia, Andrea S. J. Lin, Emily Lubar, Samuel Halverson, Suvrath Mahadevan, Chad F. Bender, Sarah E. Logsdon, Lawrence W. Ramsey, Joe P. Ninan, Gumundur Stefánsson, Andrew Monson, Christian Schwab, Arpita Roy, Leonardo A. Paredes, Eli Golub, Jesus Higuera, Jessica Klusmeyer, William McBride, Cullen Blake, Scott A. Diddams, Fabien Grisé, Arvind F. Gupta, Fred Hearty, Michael W. McElwain, Jayadev Rajagopal, Paul Robertson, Ryan C. Terrien   +26 more
doaj   +1 more source

ORFEES – a radio spectrograph for the study of solar radio bursts and space weather applications

Journal of Space Weather and Space Climate, 2021
Radio bursts are sensitive tracers of non-thermal electron populations in the solar corona. They are produced by electron beams and shock waves propagating through the corona and the heliosphere, and by trapped electron populations in coronal mass ...
Hamini Abdallah, Auxepaules Gabriel, Birée Lionel, Kenfack Guy, Kerdraon Alain, Klein Karl-Ludwig, Lespagnol Patrice, Masson Sophie, Coutouly Lucile, Fabrice Christian, Romagnan Renaud   +10 more
doaj   +1 more source

HARPS-N @ TNG, two year harvesting data : performances and results [PDF]

, 2014
The planet hunter HARPS-N[1], in operation at the Telescopio Nazionale Galileo (TNG)[13] from April 2012 is a highresolution spectrograph designed to achieve a very high radial velocity precision measurement thanks to an ultra stable environment and in a
Latham, D.W., Ian Hughes, David Henry, Bezawada, N., Fatemeh Motalebi, Glenday, A.G., Emilio Molinari, Michel Fleury, Pepe, F., Charles Maire, Phillips, D.F., Rosario Cosentino, Manuel Gonzalez, Figueira, P., Nicolas Buchschacher, Fleury, M., Gonzalez, M., Udry, S., Andrew C. Cameron, Cosentino, R., Francesco Pepe, Stephane Udry, Alexander G. Glenday, Pedro Figueira, Henry, D., Naidu Bezawada, Molinari, E., Adriano Ghedina, David Forrest Phillips, Maire, C., David W. Latham, Hughes, I., Jose Guerra, Christophe Lovis, Buchschacher, N., Motalebi, F., Lovis, C., Cameron, A.C., Guerra, J., Ghedina, A.   +39 more
core   +1 more source

Measuring the Hall Effect in Hysteretic Materials

Advanced Materials, EarlyView.
The authors highlight common pitfalls in measuring the Hall effect: in hysteretic magnets, improper data processing can create signals that look exotic but are not real. This Perspective explains the origin of these artifacts and presents practical measurement strategies that help researchers identify reliable Hall responses in complex magnetic ...
Jaime M. Moya, Anthony Voyemant, Sudipta Chatterjee, Scott B. Lee, Grigorii Skorupskii, Connor J. Pollak, Leslie M. Schoop   +6 more
wiley   +1 more source

Self-consistent Atmosphere Representation and Interaction in Photon Monte Carlo Simulations

The Astrophysical Journal
We present a self-consistent representation of the atmosphere and implement the interactions of light with the atmosphere using a photon Monte Carlo approach.
J. R. Peterson, G. Sembroski, A. Dutta, C. Remocaldo   +3 more
doaj   +1 more source

Astronomical observations: a guide for allied researchers

The Open Journal of Astrophysics, 2019
Observational astrophysics uses sophisticated technology to collect and measure electromagnetic and other radiation from beyond the Earth. Modern observatories produce large, complex datasets and extracting the maximum possible information from them ...
Pauline Barmby
doaj   +1 more source

Polarization Criterion in Targeted SETI Observation

The Astronomical Journal, 2023
In this paper, we propose a novel method for distinguishing extraterrestrial intelligence (ETI) signals from radio frequency interference (RFI) by leveraging polarization features.
Jian-Kang Li, Yu Chen, Bo-Lun Huang, Zhen-Zhao Tao, Xiao-Hang Luan, Xiao-Hui Sun, Tong-Jie Zhang, Vishal Gajjar   +7 more
doaj   +1 more source

Focal Ratio Degradation for Fiber Positioner Operation in Astronomical Spectrographs

, 2019
© 2019 The Author(s). Focal ratio degradation (FRD), the decrease of light's focal ratio between the input into an optical fiber and the output, is important to characterize for astronomical spectrographs due to its effects on throughput and the point ...
Seiffert, M, Gunn, James E, Roberts, M, Reiley, D, De Oliveira, AC, Belland, B, Cohen, J, Kirby, E, De Oliveira, LS   +8 more
core   +1 more source