Results 61 to 70 of about 67,291 (258)

Precision Speckle Pattern Reconstruction for High-contrast Imaging

The Astronomical Journal
In high-contrast imaging, a large instrumental, technological, and algorithmic effort is made to reduce residual speckle noise and improve the detection capabilities.
Dotan Gazith, Barak Zackay
doaj   +1 more source

First results of site testing program at Mt. Shatdzhatmaz in 2007 - 2009

, 2010
We present the first results of the site testing performed at Mt.~Shatdzhatmaz at Northern Caucasus, where the new Sternberg astronomical institute 2.5-m telescope will be installed.
Avila, B. Safonov, Boshnjakovitch, Bowen, Carrasco, Darchiya, Depenchuk, Ehgamberdiev, Els, Fuchs, Fuensalida, Gnevysheva, Hardy, Kornilov, Kornilov, Leushin, Lipunov, M. Kornilov, Martin, N. Shatsky, Nelyubin, O. Voziakova, Riddle, Roddier, Roddier, Rylkov, S. Potanin, Sarazin, Saunders, Schoeck, Skidmore, Soules, Tatarskii, Thomas-Osip, Thomsen, Tokovinin, Tokovinin, Tokovinin, Tokovinin, Tokovinin, Tokovinin, Tokovinin, Tokovinin, Travouillon, Travouillon, V. Kornilov, Vernin, Vernin, Wilson, Wilson, Wilson   +50 more
core   +1 more source

Magnetically Actuated Drops‐on‐Stilts Microrobots for Transport and Delivery of Hydrophobic Cargo

Advanced Materials Interfaces, EarlyView.
Iron oxide nanoparticles and oil droplets in external magnetic fields form “drops‐on‐stilts” microrobots that transport hydrophobic cargo. Tunable nanoparticle–droplet interactions generate stilt‐like structures. Field rotation enables walking, obstacle navigation, and collective motion.
Oluwafemi Ligan, Hrishabh Singh, Sahil Kulkarni, Hong Huy Tran, James M. Kikkawa, Daeyeon Lee, Ravi Radhakrishnan, Edward Steager, Hyun Koo, Kathleen Stebe   +9 more
wiley   +1 more source

An Image Quality Evaluation and Masking Algorithm Based On Pretrained Deep Neural Networks

The Astronomical Journal
With the growing amount of astronomical data, there is an increasing need for automated data processing pipelines, which can extract scientific information from observation data without human interventions.
Peng Jia, Yu Song, Jiameng Lv, Runyu Ning   +3 more
doaj   +1 more source

A dedicated tool for a full 3D Cn2 investigation

, 2010
We present in this study a mapping of the optical turbulence (OT) above different astronomical sites. The mesoscale model Meso-NH was used together with the Astro-Meso-Nh package and a set of diagnostic tools allowing for a full 3D investigation of the ...
Hagelin, Susanna, Lascaux, Franck, Masciadri, Elena   +2 more
core   +1 more source

Bioresorbable Mo–W Electrodes: Toward an Extended Operational Lifetime Through Controlled Alloying and Oxide Coating Engineering

Advanced Materials Interfaces, EarlyView.
Bioresorbable electrochemical sensors face instability in biofluids. Although alloys can mitigate rapid in vivo dissolution, Mo–W remains underexplored for sensing. This work engineers Mo–W films with a nanocrystalline oxide coating, improving stability and enabling reliable oxygen and pH sensing for up to 10 days, highlighting their potential for ...
C. Fernandes, Filippo Franceschini, Kitty Baert, Jon Ustarroz, I. Taurino   +4 more
wiley   +1 more source

Estimation of Day-Time Seeing Changes at Huairou Solar Observing Station Based on Neural Networks from 1989 to 2010

Universe
Seeing is a key factor affecting the image quality of astronomical observations and can be quantitatively described by the Fried parameter r0. The larger the r0 value (in unit of cm), the better the seeing conditions.
Xing Hu, Shangbin Yang, Tengfei Song, Xingming Bao, Wenjun Sun, Yuanyong Deng, Yu Liu, Mingyu Zhao   +7 more
doaj   +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

Characterisation of the Optical Turbulence at Siding Spring

, 2012
Measurements of the optical turbulence profile above Siding Spring Observatory were conducted during 2005 and 2006. This effort was largely motivated by the need to predict the statistical performance of adaptive optics at Siding Spring.
Goodwin, Michael, Jenkins, Charles, Lambert, Andrew   +2 more
core   +1 more source

Astronomical Seeing Prediction with Machine Learning

Research Notes of the AAS
Abstract We investigate the use of supervised machine learning models to predict current atmospheric seeing at the Observatorio del Roque de Los Muchachos, La Palma. The prediction is made from current, local meteorological conditions as measured by an on-site weather station.
Fernando Abárzuza, Iain A Steele, Helen Jermak, Joao Bento, David Copley, David Heffernan   +5 more
openaire   +1 more source