Results 91 to 100 of about 1,574,076 (309)

The Hearth of the World: The Sun before Astrophysics

Universe
This paper presents a historical overview of conceptions about the Sun in Western astronomical and cosmological traditions before the advent of spectroscopy and astrophysics. Rather than studying general cultural ideas, we focus on the concepts developed
Gábor Kutrovátz
doaj   +1 more source

Atmospheric Cold Plasma Technology Enabling Scalable Surface‐Independent Protein Immobilization for Biosensing Applications

Advanced Materials Interfaces, EarlyView.
Standardized surface‐independent immobilization of biosensing layers by means of COOH linker‐layer using plasma polymerization under atmospheric pressure conditions, with the potential for commercialization. PMMA is successfully biofunctionalized with streptavidin, IgG, and protein G, showing stable performance for at least one month.
Lieze Dankers, Bernard Nisol, Derick Yongabi, Tom Van der Donck, Jesús Gándara Loe, Patrick Wagner, Jin Won Seo, Rob Ameloot, Karen Leirs, Jeroen Lammertyn   +9 more
wiley   +1 more source

Astronomical Spectroscopy

Physical Principles of Astronomical Instrumentation, 2021
P. Ade, Griffin Matthew J., C. Tucker
semanticscholar   +1 more source

On the application of optical-fiber image scramblers to astronomical spectroscopy

, 1986
Single, step-index optical fibers, when properly employed, can function as optically efficient image scramblers. Their use as optical feeds for astronomical slit spectrographs can reduce zonal error levels in those instruments by orders of magnitude.
W. D. Heacox
semanticscholar   +1 more source

Integrated Ovonic Threshold Switching Selector and Resistive Switching Memory 1S1R in Electrodeposited ZnTe Thin Films

Advanced Materials Technologies, EarlyView.
This study showcases the first‐ever demonstration of ovonic threshold switching (OTS) and resistive switching (RS) in ZnTe thin films fabricated via a fast, cost‐effective electrodeposition method. By controlling the deposition potential, ZnTe film is tuned to demonstrate OTS or RS behaviors, enabling the implementation of one‐selector‐one‐resistor ...
Ayoub H. Jaafar, Haytham Hussein, Tongjun Zhang, Nikolay Zhelev, Neil T. Kemp, Gillian Reid, Kees de Groot, Philip N. Bartlett, Ruomeng Huang   +8 more
wiley   +1 more source

Empirically Constraining the Spectra of Stellar Surface Features Using Time-resolved Spectroscopy

The Astrophysical Journal Letters
Transmission spectroscopy is currently the technique best suited to study a wide range of planetary atmospheres, leveraging the filtering of a star’s light by a planet’s atmosphere rather than its own emission.
David Berardo, Julien de Wit, Benjamin V. Rackham   +2 more
doaj   +1 more source

How to Manufacture Photonic Metamaterials

Advanced Materials Technologies, EarlyView.
Metamaterials boast applications such as invisibility and “hyperlenses” with resolution beyond the diffraction limit, but these applications haven’t been exploited in earnest and the market for them hasn’t grown much likely because facile and economical methods for fabricating them without defect has not emerged.
Apurba Paul, Gregory Timp
wiley   +1 more source

Gemini High-resolution Optical Spectrograph (GHOST) at Gemini South: Instrument Performance and Integration, First Science, and Next Steps

The Astronomical Journal
The Gemini South telescope is now equipped with a new high-resolution spectrograph called the Gemini High-resolution Optical SpecTrograph (GHOST). This instrument provides high-efficiency, high-resolution spectra covering 347–1060 nm in a single exposure
V. M. Kalari, R. J. Diaz, G. Robertson, A. McConnachie, M. Ireland, R. Salinas, P. Young, C. Simpson, C. Hayes, J. Nielsen, G. Burley, J. Pazder, M. Gomez-Jimenez, E. Martioli, S. B. Howell, M. Jeong, S. Juneau, R. Ruiz-Carmona, S. Margheim, A. Sheinis, A. Anthony, G. Baker, T. A. M. Berg, T. Cao, E. Chapin, T. Chin, K. Chiboucas, V. Churilov, E. Deibert, A. Densmore, J. Dunn, M. L. Edgar, J. Heo, D. Henderson, T. Farrell, J. Font, V. Firpo, J. Fuentes, K. Labrie, S. Lambert, J. Lawrence, J. Lothrop, R. McDermid, B. W. Miller, G. Perez, V. M. Placco, P. Prado, C. Quiroz, F. Ramos, R. Rutten, K. M. G. Silva, J. Thomas-Osip, C. Urrutia, W. D. Vacca, K. Venn, F. Waller, L. Waller, M. White, S. Xu, R. Zhelem   +59 more
doaj   +1 more source

Toward Advancement of Fabrication Techniques of Neuromorphic Computing Devices Based on 2D Materials

Advanced Materials Technologies, EarlyView.
This review highlights emerging fabrication techniques of 2D material‐based neuromorphic devices, emphasizing proximity vapor transfer for bioinspired optoelectronic applications. Abstract The growing necessity for power‐efficient and cognitive computation mechanisms has driven progress in neuromorphic computing which seeks to imitate the synaptic ...
Shubham Umeshkumar Gupta, Malkeshkumar Patel, Naveen Kumar, László Pohl, Min‐Joon Park, Sung‐Min Youn, Chaewhan Jeong, Joondong Kim   +7 more
wiley   +1 more source

Why Machine Learning Models Systematically Underestimate Extreme Values

The Open Journal of Astrophysics
A persistent challenge in astronomical machine learning is a systematic bias where predictions compress the dynamic range of true values---high values are consistently predicted too low while low values are predicted too high. Understanding this bias has
Yuan-Sen Ting
doaj   +1 more source