Results 41 to 50 of about 2,140 (245)

Design and Characterization of a Dual‐Mode Soft Robotic Flapping Propeller With Pneumatic Stiffness Modulation

Advanced Intelligent Systems, EarlyView.
A novel soft robotic propeller overcomes traditional efficiency‐flexibility tradeoffs via a hybrid pneumatic‐cable actuation strategy. This architecture enables active stiffness modulation with dual‐mode locomotion: tunable biomimetic swimming and earthworm‐inspired wriggling for confined spaces.
Jiazi Geng, Hua Shao, Yiyang Li, Lin Liang, Jinfeng Yang, Xianhong He, Fengran Xie   +6 more
wiley   +1 more source

Using Muon Rings for the Calibration of the Cherenkov Telescope Array: An Analytical Solution for the Dual-mirror Telescope Using Vector Geometry

The Astrophysical Journal Supplement Series
The analysis of ring images produced by muons in imaging atmospheric Cherenkov telescopes provides a powerful and precise method for calibrating the optical throughput of the instrument and monitoring its optical point-spread function.
Markus Gaug, Víctor Giráldez-Segalàs, Fiona Redmen   +2 more
doaj   +1 more source

Robotic observation pipeline for small bodies in the solar system based on open-source software and commercially available telescope hardware

Frontiers in Astronomy and Space Sciences, 2022
The observation of small bodies in the Space Environment is an ongoing important task in astronomy. While nowadays new objects are mostly detected in larger sky surveys, several follow-up observations are usually needed for each object to improve the ...
Tobias Hoffmann, Tobias Hoffmann, Matti Gehlen, Thorsten Plaggenborg, Gerhard Drolshagen, Theresa Ott, Jutta Kunz, Toni Santana-Ros, Toni Santana-Ros, Marcin Gedek, Rafał Reszelewski, Michał Żołnowski, Björn Poppe   +12 more
doaj   +1 more source

Optimizing Structural Parameters and Layout of Fiber Positioners with the Whale Optimization Algorithm for LAMOST

The Astronomical Journal
Robotic fiber positioner (RFP) arrays are essential for multiobject spectroscopic telescopes. To improve the survey efficiency, they are densely arranged on the focal planes with overlapped patrol areas, guaranteeing full coverage and increasing the ...
Zengxiang Zhou, Jiahao Zhou, Baolong Chen, Jianping Wang, Zhigang Liu, Hongzhuan Hu, Feifan Zhang   +6 more
doaj   +1 more source

Numerical Focusing of a Wide Field-of-View Instrument for Monitoring the Planetary Energy Budget

Proceedings, 2019
Wide field-of-view optical instruments based on Ritchey-Crétien telescopes have been proposed to replace narrow field-of-view scanning instruments for Earth radiation budget monitoring applications.
Anum Barki Ashraf, J. Robert Mahan, Kory J. Priestley, Mohan Shankar   +3 more
doaj   +1 more source

The THESEUS Space Mission and the Infrared Telescope Calibration Unit

Astronomische Nachrichten, EarlyView.
ABSTRACT The Transient High‐Energy Sky and Early Universe Surveyor (THESEUS) is an ESA M7 mission concept currently in Phase A, designed to exploit gamma‐ray bursts to probe the early Universe while advancing multi‐messenger and time‐domain astrophysics. To achieve its ambitious goals, THESEUS will combine wide‐band x‐ray and gamma‐ray monitors with an
András Péter Joó, Rebeka Gyöngyi Kiss, Lorenzo Amati, Bendegúz Koncz, Örs Detre, Gyula Zilizi, Zsolt Bagoly, István I. Rácz, Sándor Pintér, L. Viktor Tóth   +9 more
wiley   +1 more source

Comparison of Wavefront Sensing Methods for Solar Ground-Layer Adaptive Optics: Multi-Direction Averaging and Wide-Field Correlation

Photonics
Solar ground-layer adaptive optics (GLAO) is widely recognized as a key technology for achieving high-resolution, wide-field imaging in ground-based solar telescopes. However, the accuracy differences among various wavefront sensing methods in solar GLAO
Yuhe Liu, Ziming Li, Qianhan Zhou, Nanfei Yan, Xian Ran, Ao Tang, Zhen Li, Lanqiang Zhang, Changhui Rao   +8 more
doaj   +1 more source

Zwicky Transient Facility and Globular Clusters: The gr-band Period–Luminosity Relations for Mira Variables at Maximum Light and their Applications to Local Galaxies

The Astronomical Journal, 2023
Based on 14 Miras located in seven globular clusters, we derived the first gr -band period–luminosity (PL) at maximum light for the large-amplitude Mira variables using the multiyear light-curve data collected from the Zwicky Transient Facility (ZTF ...
C.-C. Ngeow, Jia-Yu Ou, Anupam Bhardwaj, Josiah Purdum, Ben Rusholme, Avery Wold   +5 more
doaj   +1 more source

Feasibility Study for Application of Digitized Henize Mt. Wilson Michigan Southern Sky Hα$$ \boldsymbol{\alpha} $$ Survey Low‐Dispersive Spectral Plates for Searches for Anomalous and Highly Redshifted Objects

Astronomische Nachrichten, EarlyView.
ABSTRACT The goal of this study is to confirm the feasibility of the use of digitized low dispersive MtWilson Michigan Southern Sky Hα$$ \alpha $$ survey astronomical photographic plates for modern astrophysical research. The detection of highly redshifted objects, such as early galaxies and quasars, is fundamental to understanding the universe's ...
Tauseef Ahmad Zafar, René Hudec, Marta Mara Merono Vidagany, Fehmi Mejri   +3 more
wiley   +1 more source

The Optical Corrector for the Dark Energy Spectroscopic Instrument

The Astronomical Journal
The Dark Energy Spectroscopic Instrument (DESI) is currently measuring the spectra of 40 million galaxies and quasars, the largest such survey ever made to probe the nature of cosmological dark energy.
Timothy N. Miller, Peter Doel, Gaston Gutierrez, Robert Besuner, David Brooks, Giuseppe Gallo, Henry Heetderks, Patrick Jelinsky, Stephen M. Kent, Michael Lampton, Michael E. Levi, Ming Liang, Aaron Meisner, Michael J. Sholl, Joseph Harry Silber, David Sprayberry, Jessica Nicole Aguilar, Axel de la Macorra, Daniel Eisenstein, Kevin Fanning, Andreu Font-Ribera, Enrique Gaztañaga, Satya Gontcho A Gontcho, Klaus Honscheid, Jorge Jimenez, Dick Joyce, Robert Kehoe, Theodore Kisner, Anthony Kremin, Martin Landriau, Laurent Le Guillou, Christophe Magneville, Paul Martini, Ramon Miquel, John Moustakas, Jundan Nie, Will Percival, Claire Poppett, Francisco Prada, Graziano Rossi, David Schlegel, Michael Schubnell, Hee-Jong Seo, Ray Sharples, Gregory Tarlé, Mariana Vargas-Magaña, Zhimin Zhou, the DESI Collaboration   +47 more
doaj   +1 more source