Results 81 to 90 of about 81,210 (254)

Multi-Fiber Spectroscopy by Wide-Field Telescopes [PDF]

Symposium - International Astronomical Union, 1995
Fiber-fed multi-object systems are now the preferred instruments for gathering spectroscopic data on survey scales. The technique lends itself particularly well to telescopes with fields of 30 arcminutes or more. This paper gives a broad overview of the instrumental considerations involved in its implementation.
openaire   +1 more source

Chan–Lam Cross‐Coupling With Alkylboron Reagents: From Transmetallation to Radical Pathways

European Journal of Organic Chemistry, EarlyView.
Alkylative Chan–Lam coupling overcomes intrinsic transmetallation limitations of alkylboron reagents by engaging radical pathways. Recent advances reveal how radical and radical–polar crossover mechanisms enable mild C(sp3)—heteroatom bond formation. This minireview highlights key mechanistic insights and emerging strategies that transform alkylboron ...
Nicolas G.‐Simonian, Andrea Serafino, Luc Neuville, Géraldine Masson   +3 more
wiley   +1 more source

Visible‐Light‐Promoted, (Photo)catalyst‐Free Synthesis of 3‐Sulfonyl‐Azaspiro[4.5]trienones via Arylazo Sulfones

European Journal of Organic Chemistry, EarlyView.
A set of 3‐sulfonyl‐azaspiro[4.5]trienones have been obtained via a metal‐ and photocatalyst‐free visible‐light‐driven dearomative strategy. The protocol exploits arylazo sulfones, which act simultaneously as the light absorber and sulfonyl‐radical source, enabling ipso‐spirocyclization of differently substituted N‐aryl propiolamides.
Luca Nicchio, Giulia Pompilio, Maurizio Fagnoni, Luc Neuville, Géraldine Masson, Stefano Protti   +5 more
wiley   +1 more source

Understanding pulsar magnetospheres with the SKAO

The Open Journal of Astrophysics
The SKA telescopes will bring unparalleled sensitivity across a broad radio band, a wide field of view across the Southern sky, and the capacity for sub-arraying, all of which make it the ideal instrument for studying the pulsar magnetosphere. This paper
Lucy S Oswald, Avishek Basu, Manoneeta Chakraborty, Bhal Chandra Joshi, Natalia Lewandowska, Kuo Liu, Marcus Lower, Alexander Phillipov, Xiaoxi Song, Pratik Tarafdar, Joeri van Leeuwen, Anna Watts, Patrick Weltevrede, Geoff Wright, Jan Benacek, Aru Beri, Shunshun Cao, Paolo Esposito, Fabian Jankowski, Jinchen Jiang, Aris Karastergiou, Kejia Lee, Nanda Rea, Dany Vohl, SKA Pulsar Science Working Group   +24 more
doaj   +1 more source

All‐spherical telescope with extremely wide field of view [PDF]

Astronomische Nachrichten, 2016
AbstractAn all‐spherical catadioptic telescope with the angular field of view of several tens of degrees in diameter and spherical focal surface is proposed for the monitoring of large sky areas. We provide a few examples of such a system with the apertures up to 800 mm and the field of view 30° and 40° in diameter.
openaire   +3 more sources

Design of a Hydroelectronic Solar‐Tracking System for Solar Panels

Energy Science &Engineering, EarlyView.
A prototype of a passive solar‐tracking system utilizing buoyant force based on water level was developed, and its MATLAB/Simulink model was implemented. This study is expected to encourage researchers to design solar‐tracking mechanisms using metals with different thermal expansion coefficients, air, oil, and other fluids. ABSTRACT This study presents
Ufuk Süğürtin, Türker Fedai Çavuş
wiley   +1 more source

Real-time Collision-free Motion Planning for Next-generation Fiber Positioners in LAMOST

The Astronomical Journal
Multiobject fiber-fed spectrographs have thousands of fiber positioners packed on a focal plane with shared working space to move the fiber-ends in parallel, which maximizes observation time.
Guifeng Chen, Zhen Zhang, Chunhui Su, YongGang Gu, Chao Zhai   +4 more
doaj   +1 more source

Recent advances in multifunctional soft robots: A materials–structures–systems co‐design perspective for synergistic integration

FlexMat, EarlyView.
Abstract Soft robots, engineered from highly compliant materials, offer superior adaptability and safety in unstructured environments compared to their rigid counterparts. Recent advancements, fueled by bio‐inspiration and material programmability, have led to the rapid co‐evolution of their core modules: actuation, sensing, protection, energy, and ...
Qiulei Liu, Zicao Peng, Chong Sun, Haitao Yang   +3 more
wiley   +1 more source

The Lack of RR Lyrae Variables in Ultrafaint Dwarf Galaxy Sextans II

The Astronomical Journal
RR Lyrae in ultrafaint dwarf (UFD) galaxies, if found, would be valuable to constrain the distances of these UFD. In this work, we report our search of RR Lyrae in a recently discovered UFD—Sextans II. Based on multiband (griz) time-series archival DECam
Chow-Choong Ngeow, Anupam Bhardwaj
doaj   +1 more source

Germanium‐Based Mid‐Infrared Integrated Photonics

Laser &Photonics Reviews, EarlyView.
The mid‐infrared (mid‐IR) spectral range is a part of the electromagnetic spectrum in which most of the molecules have vibrational and rotational resonances. Photonics integration in this wavelength range have thus seen a burst of interest in the recent years, mainly driven by applications related with the detection of chemical and biological ...
Delphine Marris‐Morini, Goran Z. Mashanovich, Milos Nedeljkovic, Carlos Alonso‐Ramos, Laurent Vivien, Jacopo Frigerio, Giovanni Isella   +6 more
wiley   +1 more source