Results 71 to 80 of about 10,502,106 (355)

Adaptive Optics for Extremely Large Telescopes

, 2019
Adaptive Optics has become a key technology for the largest ground-based telescopes currently under or close to begin of construction. Adaptive optics is an indispensable component and has basically only one task, that is to operate the telescope at its ...
Hippler, Stefan
core   +1 more source

Photonic Engineering Enables All‐Passive Upconversion Imaging with Low‐Intensity Near‐Infrared Light

Advanced Functional Materials, EarlyView.
A passive upconversion imaging system enables the observation of scenes illuminated by low‐intensity incoherent near‐infrared light from 750 to 930 nm, by converting it into the visible without the use of external power. The upconverter is enabled by triplet–triplet annihilation in a bulk heterojunction, with absorption enhanced by plasmonic resonators
Rabeeya Hamid, Demeng Feng, Pournima Narayanan, Justin S. Edwards, Manchen Hu, Emma Belliveau, Minjeong Kim, Shenwei Yin, Sanket Deshpande, Chenghao Wan, Linda Pucurimay, David A. Czaplewski, Daniel N. Congreve, Mikhail A. Kats   +13 more
wiley   +1 more source

Images from Large Schmidt Telescopes [PDF]

International Astronomical Union Colloquium, 1984
AbstractCalculations have been made of the intensity distribution of star images formed at the focal surface of large Schmidt telescopes. The calculations take account of atmaspheric seeing, aperture diffraction, manufacturing errors, chromatic errors in the corrector plate, scattering in the emulsion, photographic response and grain structure.
D.S. Brown, C.N. Dunlop, J.V. Major
openaire   +1 more source

Cold optical design for the large aperture Simons' Observatory telescope [PDF]

Astronomical Telescopes + Instrumentation, 2018
The Simons Observatory will consist of a single large (6 m diameter) telescope and a number of smaller (∼0.5 m diameter) refracting telescopes designed to measure the polarization of the Cosmic Microwave Background to unprecedented accuracy.
S. Dicker, P. Gallardo, J. E. Gudmudsson, P. Mauskopf, A. Ali, P. Ashton, G. Coppi, M. Devlin, N. Galitzki, S. Ho, C. Hill, J. Hubmayr, B. Keating, A. Lee, M. Limon, F. Matsuda, J. McMahon, M. Niemack, J. Orlowski-Scherer, L. Piccirillo, M. Salatino, S. Simon, S. Staggs, R. Thornton, J. Ullom, E. Vavagiakis, Edward J. Wollack, Z. Xu, N. Zhu   +28 more
semanticscholar   +1 more source

Synergistic Fluorine and Cyanide Co‐Modification to Reinforce Photoinduced Excitons Formation and Transfer for Efficient CO2 Photoreduction

Advanced Functional Materials, EarlyView.
An advanced F‐doped and ─CN group co‐modified FCCN is developed. Due to the synergistic effects of co‐modification in promoting photogenerated exciton generation, enhancing charge kinetics, expanding active interfacial areas, and optimizing CO2 interfacial reactions, the FCCN photocatalyst demonstrates excellent catalytic performance and high ...
Sheng‐Qi Guo, Qingqing Dong, Xiaodong Sun, Ziqi Zhang, Linda Wang, Lei Bao, Bozhan Li, Hui Li, Yanrui Li, Tianyi Ma   +9 more
wiley   +1 more source

Modelling and design of a coupled system of multiple hydraulic systems and large structures

Nihon Kikai Gakkai ronbunshu
Control of large structures often involves the use of hydraulic equipment due to the large power requirements. In this study, a large telescope is taken as an example of a large structure.
Tomoya HATTORI, Satoshi SATOH, Katsuhiko YAMADA   +2 more
doaj   +1 more source

Active Surface Compensation for Large Radio Telescope Antennas

International Journal of Antennas and Propagation, 2018
With the development of radio telescope antennas with large apertures, high gain, and wide frequency bands, compensation methods, such as mechanical or electronic compensation, are obviously essential to ensure the electrical performance of antennas that
Congsi Wang, Haihua Li, Kang Ying, Qian Xu, Na Wang, Baoyan Duan, Wei Gao, Lan Xiao, Yuhu Duan   +8 more
doaj   +1 more source

From Mechanics to Electronics: Influence of ALD Interlayers on the Multiaxial Electro‐Mechanical Behavior of Metal–Oxide Bilayers

Advanced Functional Materials, EarlyView.
Ultrathin AlOxHy interlayers between aluminum films and polymer substrates significantly improve electro‐mechanical properties of flexible thin film systems. By precisely controlling interlayer thickness using atomic layer deposition, this study identifies an optimal interlayer thickness of 5–10 nm that enhances ductility and delays cracking.
Johanna Byloff, Vivek Devulapalli, Daniele Casari, Thomas E. J. Edwards, Claus O. W. Trost, Megan J. Cordill, Shuhel Altaf Husain, Pierre‐Olivier Renault, Damien Faurie, Barbara Putz   +9 more
wiley   +1 more source

Observation of Io's Resurfacing via Plume Deposition Using Ground‐Based Adaptive Optics at Visible Wavelengths With LBT SHARK‐VIS

Geophysical Research Letters
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes on Io's surface have been monitored from both spacecraft and ground‐based telescopes.
Al Conrad, Fernando Pedichini, Gianluca Li Causi, Simone Antoniucci, Imke dePater, Ashley Gerard Davies, Katherine deKleer, Roberto Piazzesi, Vincenzo Testa, Piero Vaccari, Martina Vicinanza, Jennifer Power, Steve Ertel, Joseph C. Shields, Sam Ragland, Fabrizio Giorgi, Stuart M. Jefferies, Douglas Hope, Jason Perry, David A. Williams, David M. Nelson   +20 more
doaj   +1 more source

Design and Preliminary Ground Experiment for Deployable Sunshade Structures of a Modular Space Telescope

Sensors
On-orbit assembling space telescope (OAST) is one of the most feasible methods to implement a large-scale space telescope. Unlike a monolithic space telescope (such as Hubble Space Telescope, HST) or a deployable space telescope (such as James Webb Space
Ye Kuang, Shuaihui Wang, Yan Gao, Boqian Xu, Shuyan Xu   +4 more
doaj   +1 more source