Results 71 to 80 of about 52,673 (276)

Integrated photonic building blocks for next-generation astronomical instrumentation II: the multimode to single mode transition

, 2013
There are numerous advantages to exploiting diffraction-limited instrumentation at astronomical observatories, which include smaller footprints, less mechanical and thermal instabilities and high levels of performance.
Gross, Simon, Ireland, Michael J., Jovanovic, Nemanja, Lawrence, Jon S., Spaleniak, Izabela, Withford, Michael J.   +5 more
core   +1 more source

Versatile Gasochromic Hydrogen Detection via Supraparticle‐Based Applied Composite Materials

Advanced Optical Materials, EarlyView.
Silica‐platinum‐resazurin supraparticles are embedded into PMMA to form suprabeads and thin films. The thereby obtained indicators change color from purple to pink to colorless on hydrogen exposure. The indicator systems are tested under various environmental conditions, and their performance is related to their microscopically visualized structure ...
Sarah Wenderoth, Maximilian Oppmann, Daniel Dzoic, Thomas Zimmermann, Mickaël Lejoyeux, Andreas Graff, Benedikt Schug, Susanne Wintzheimer   +7 more
wiley   +1 more source

A Hierarchical Point-spread Function Reconstruction Method

The Astrophysical Journal
Reconstruction of the point-spread function (PSF) plays an important role in many areas of astronomy, including photometry, astrometry, galaxy morphology, and shear measurement.
Pedro Alonso, Jun Zhang, Cong Liu
doaj   +1 more source

Photonic ring resonator filters for astronomical OH suppression

, 2017
Ring resonators provide a means of filtering specific wavelengths from a waveguide, and optionally dropping the filtered wavelengths into a second waveguide. Both of these features are potentially useful for astronomical instruments.
Bland-Hawthorn, J., Ellis, S. C., Gupta, R. R., Kuehn, K., Kuhlmann, S., Liu, P., Ocola, L., Spinka, H., Stern, N. P., Tuthill, P., Underwood, D., Wei, G.   +11 more
core   +1 more source

Midbrain PAG Astrocytes Modulate Mouse Defensive and Panic‐Like Behaviors

Advanced Science, EarlyView.
Astrocytes in the midbrain periaqueductal gray (PAG) dynamically encode threat intensity and shape defensive action selection in mice. Real‐time Ca2+ imaging reveals robust astrocytic activation during predator odor and CO2 exposure. Aberrant astrocytic Ca2+ overactivation disrupts goal‐directed escape, biases behavior toward freezing, and induces ...
Ellane Barcelon, Kyungchul Noh, Minkyu Hwang, Yoon‐Jung Kim, Unjin Lee, Yeon Joo Ryu, Je‐Kyung Ryu, Sang Beom Jun, Se‐Young Choi, Woo‐Hyun Cho, Sung Joong Lee   +10 more
wiley   +1 more source

Astrometry Lost and Regained

Open Astronomy, 2011
Technological and scientific developments during the past century made a new branch of astronomy flourish, i.e. astrophysics, and resulted in our present deep understanding of the whole Universe.
Høg E.
doaj   +1 more source

A Degradable Bioinspired Flier with Aerogel‐Based Colorimetric Sensors for Environmental Monitoring

Advanced Science, EarlyView.
Biodegradable fliers are developed inspired by Tipuana tipu samaras, integrating cellulose nanocrystal aerogel (CNCa) sensors loaded with natural dyes for pH and ammonia detection. The lightweight, degradable fliers mimic natural morphology and aerodynamics, offering an eco‐friendly, scalable solution for in situ environmental monitoring after passive ...
Gianpaolo Gallo, Ruowen Tu, Carlo Filippeschi, Stefano Mariani, Barbara Mazzolai   +4 more
wiley   +1 more source

A 1 bit Raw Voltage-recording System for Dedicated Observations of Transients at Low Radio Frequencies

The Astrophysical Journal Supplement Series
Recently we had reported commissioning of a prototype for pulsar observations at low radio frequencies (
Kshitij S. Bane, Indrajit V. Barve, G. V. S. Gireesh, C. Kathiravan, R. Ramesh   +4 more
doaj   +1 more source

Early Detection of Cell Death Using Transmembrane Water Exchange Magnetic Resonance Imaging

Advanced Science, EarlyView.
Cell death is important in both the development and treatment of cancer. In this study, it is demonstrated for the first time that a specific measurement of the transmembrane water exchange rate using magnetic resonance imaging can be used as an early marker of cell death in mammalian cells, in animals and in human patients. Abstract Cell death plays a
Athanasia Kaika, Luca Nagel, Ulrike Höckendorf, Bangwen Xie, Geoffrey J. Topping, Mathias Schillmaier, Irina Beer, Frits H. A. van Heijster, Julian Rauch, Tristan A. Kuder, Sandra Sühnel, Bernd Erber, Christian Lohrmann, Simone Ballke, Thomas Metzler, Katja Steiger, Philipp J. Jost, Natalia P. Ivleva, Philipp Paprottka, Jonathan Nadjiri, Kevin M. Brindle, Wolfgang A. Weber, Franz Schilling   +22 more
wiley   +1 more source

Design and Performance of a 30/40 GHz Diplexed Focal Plane for the BICEP Array

The Astrophysical Journal Supplement Series
We demonstrate a wideband diplexed focal plane suitable for observing low-frequency foregrounds that are important for cosmic microwave background polarimetry.
Corwin Shiu, Ahmed Soliman, Roger O’Brient, Bryan Steinbach, James J. Bock, Clifford F. Frez, William C. Jones, Krikor. G. Megerian, Lorenzo Moncelsi, Alessandro Schillaci, Anthony D. Turner, Alexis C. Weber, Cheng Zhang, Silvia Zhang   +13 more
doaj   +1 more source