Results 61 to 70 of about 4,967 (311)

Lucky exposures: diffraction limited astronomical imaging through the atmosphere [PDF]

, 2003
The resolution of astronomical imaging from large optical telescopes is usually limited by the blurring effects of refractive index fluctuations in the Earth’s atmosphere. By taking a large number of short exposure images through the atmosphere, and then
Tubbs, Robert Nigel
core   +2 more sources

Surfactants as a Tool for Coupling Light Into Hydrodynamic Flow: The Influence of Surfactant Hydrophobicity and Head Polarity

Advanced Materials Interfaces, EarlyView.
Reversible light‐induced gradients at solid–liquid interfaces enable controllable interfacial transport via light‐driven diffusioosmosis. We demonstrate directed particle manipulation based on dynamically generated concentration gradients. The mechanism is broadly applicable to cationic, anionic, and non‐ionic surfactants with varying hydrophobicity ...
Maren Umlandt, David Feldmann, Nino Lomadze, Svetlana Santer   +3 more
wiley   +1 more source

Ground-Based Astronomical Instrumentation Development in the United States: A White Paper on the Challenges Faced by the US Community [PDF]

, 2022
This invited white paper, submitted to the National Science Foundation in January of 2020, discusses the current challenges faced by the United States astronomical instrumentation community in the era of extremely large telescopes.
Smee, Stephen A., Hill, Gary J.
core   +1 more source

The Influence of Mesoscale Particle Structure on the Electrode Degradation and Resultant Electrochemistry of Lithium Ion Cells With Nickel Rich Lithium Nickel Manganese Cobalt Oxide Positive Electrodes

Advanced Materials Technologies, EarlyView.
Milled polycrystalline NMC811 cathode (MPC NMC) with smaller secondary particle and higher surface area had 1) greater cathode tortuosity, 2) reduced surface Ni on the cycled MPC cathodes consistent with surface reconstruction, and 3) increased Ni deposition from cathode‐anode crosstalk, manifesting in lower functional capacity and higher impedance ...
Edelmy J. Marin Bernardez, Andrew Nicoll, David J. Arnot, Armando Rodriguez Campos, Patrick J. Barry, Marie F. Millares, Cynthia Huang, Melissa A. Guercio, Grace K. Dono, Alexis Pace, Xianghui Xiao, Cherno Jaye, Conan Weiland, Jianming Bai, Hui Zhong, Michael Drakopoulos, Zhong Zhong, Nghia T. Vo, Xiao Tong, Esther S. Takeuchi, Amy C. Marschilok, Shan Yan, Kenneth J. Takeuchi   +22 more
wiley   +1 more source

Multiplicity of Galactic Cepheids from long-baseline interferometry I. CHARA/MIRC detection of the companion of V1334 Cygni [PDF]

, 2013
W.G. and G.P. acknowledge financial support for this work from the BASAL Centro de Astrofísica y Tecnologías Afines (CATA) PFB-06/2007. Support from the Polish National Science Centre grant MAESTRO and the Polish Ministry of Science grant Ideas Plus ...
Monnier, J., Mérand, Antoine, Pietrzyński, Grzegorz, F. Baron, Gallenne, Alexandre, ten Brummelaar, T., G. H. Schaefer, C. Farrington, Monnier, J. D., G. Pietrzyński, Gieren, W., E. Pedretti, Pietrzynski, G., Schaefer, G.~H., N. Vargas, Che, X., Kervella, P., Kraus, S., McAlister, H., Turner, N., J. D. Monnier, L. Szabados, Pedretti, E., N. Turner, A. Mérand, Kervella, Pierre, P. Kervella, Pietrzyski, G., S. Kraus, A. Gallenne, Schaefer, G., Baron, F., Monnier, J.~D., L. Sturmann, Szabados, László, X. Che, Schaefer, G. H., Szabados, L., Farrington, C., Vargas, N., H. McAlister, T. ten Brummelaar, Merand, A., Sturmann, J., J. Sturmann, Gallenne, A., Sturmann, L., W. Gieren   +47 more
core   +1 more source

Linking Device Performance to Nanoscale Photoactivation of Grain Boundaries in 2D Hybrid Halide Perovskites

Advanced Materials Technologies, EarlyView.
The opto‐electronic response of polycrystalline (PEA)2PbBr4 thin films is investigated by correlating macroscopic photodetector performance with nanoscale mapping techniques. Grain boundary density is systematically tuned through crystallization control and linked to device responsivity.
Camilla Bordoni, Lorenzo Calcaterra, Andrea Ciavatti, Silvia Milita, Valentina Bonino, Lorenzo Margotti, Sara Cepić, Marisa Di Sabatino, Federico Boscherini, Daniela Cavalcoli, Beatrice Fraboni   +10 more
wiley   +1 more source

Collision Probability Evaluation of LAMOST Robotic Fiber Positioners in the Design Phase

The Astronomical Journal
Multiobject spectroscopic telescopes are crucial for modern astronomy. Among them, the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), with thousands of robotic fiber positioners (RFPs), is the one with the highest spectra acquisition
Baolong Chen, Jianping Wang, Jiahao Zhou, Zhigang Liu, Hongzhuan Hu, Zengxiang Zhou, Feifan Zhang   +6 more
doaj   +1 more source

Engineering Energy Harvesting Pathways in Mn‐Yb‐Doped Perovskite Nanocrystals

Advanced Optical Materials, EarlyView.
Mn‐Yb codoping in metal halide perovskite nanocrystals establishes dual‐channel energy reservoirs that capture charge carriers and drip‐feed them back to the host on millisecond timescales. This synergistic recycling mechanism overcomes prompt nanosecond recombination limitations, enabling an eight‐fold enhancement in photocatalytic CO2​ reduction ...
Manoj Sharma, Chang Cao, Pria Ramkissoon, Hanchen Li, Nadine J. Schrenker, Naufan Nurrosyid, Anthony S. R. Chesman, Junhong Yu, Joanne Etheridge, Trevor A. Smith, Akshat Tanksale, Jacek. J. Jasieniak   +11 more
wiley   +1 more source

Slovak-Bavarian collaboration on the development of telescope instrumentation [PDF]

, 2018
Within the project SLOBATCO (Slovak-Bavarian Telescope Collaboration) the Astronomical Institute of the Slovak Academy of Sciences and Aschaffenburg University of Applied Sciences collaborate in the development and commissioning of the new Ø1.3 m ...
Mann, Michael (Prof. Dr.-Ing.), Döhring, Thorsten (Prof. Dr.), Sivanic, Peter (Ing.), Stollenwerk, Manfred (Prof. Dr.), Probulla, Theodor (Dr.), Komzik, Richard (Dr.)   +5 more
core  

Guangqi: A 2D Radiation Hydrodynamic Code with Realistic Equations of State

The Astrophysical Journal Supplement Series
We present Guangqi , a new 2D, finite-volume radiation hydrodynamics code designed for high-performance astrophysical simulations. The code simultaneously resolves the hydrodynamic equations for complex equations of state (EoS) and implicit radiation ...
Zhuo Chen, Xue-Ning Bai
doaj   +1 more source