Results 111 to 120 of about 1,120,334 (339)

On atmospheric optical communications

Revue de Physique Appliquée, 1984
This paper investigates, more rigorously, the diffraction of a powerful optical carrier propagating in an unguided communication channel (dry atmosphere). Four main relevant topics are considered i) the radial temperature distribution, ii) the average beamwidth parameter, iii) a dimensionless optical distortion figure of merit, and iv) the irradiance ...
El-Badawy, El-S. A., El-Halafawy, F.Z.
openaire   +2 more sources

Gemini multi-conjugate adaptive optics system review II: Commissioning, operation and overall performance

, 2014
The Gemini Multi-conjugate Adaptive Optics System - GeMS, a facility instrument mounted on the Gemini South telescope, delivers a uniform, near diffraction limited images at near infrared wavelengths (0.95 microns- 2.5 microns) over a field of view of ...
Arriagada, Gustavo, Bec, Matthieu, Boccas, Maxime, Carrasco, Eleazar Rodrigo, Colazo, Felipe, d'Orgeville, Céline, Diggs, Sarah J., Ebbers, Angelic W., Edwards, Michelle L., Fesquet, Vincent, Galvez, Ramon L., Garrel, Vincent, Gausachs, Gaston, Lopez, Ariel, Lührs, Javier, Marchant, Claudio, Marin, Eduardo, McGregor, Peter, Montes, Vanessa, Moreno, Cristian, Neichel, Benoit, Pessev, Peter, Rambold, William N., Rigaut, François, Serio, Andrew, Trancho, Gelys, Trujillo, Chadwick, Urrutia, Cristian, van Dam, Marcos A., Vidal, Fabrice, Vucina, Tomislav B., Winge, Claudia, Young, Peter J.   +32 more
core   +3 more sources

Characterization of a Recyclate‐Based MgO‐Steel Composite As‐Sintered Inert Anode Candidate After Exposure to Cryolite Electrolysis

Advanced Engineering Materials, EarlyView.
Carbon‐free inert anodes are essential for decarbonizing aluminum electrolysis. This study investigates a recyclate‐based MgO‐316L steel composite anode tested under galvanostatic Hall–Héroult conditions in cryolite at 1000°C. Microstructural analysis reveals selective MgO fluorination, spinel and oxide layer formation, electrolyte infiltration, and ...
Serhii Yaroshevskyi, Alexander Adamczyk, Nora Brachhold, Gert Schmidt, Jana Hubálková, R. Gumeniuk, Alexandros Charitos, Christos G. Aneziris   +7 more
wiley   +1 more source

Influence of an Oxygen‐Free Atmosphere on Diamond‐Single‐Grain Scratching of Ti–6Al–4V

Advanced Engineering Materials, EarlyView.
Single‐grain scratching of Ti–6Al–4V is investigated under controlled, oxygen‐free, and ambient atmospheres using a novel experimental setup with in situ high‐speed imaging. The approach enables direct observation of chip formation and adhesion under suppressed oxidation.
Berend Denkena, Benjamin Bergmann, Michael Zenger   +2 more
wiley   +1 more source

Twisted Light Transmission over 143 kilometers

, 2016
Spatial modes of light can potentially carry a vast amount of information, making them promising candidates for both classical and quantum communication. However, the distribution of such modes over large distances remains difficult.
Fickler, Robert, Fink, Matthias, Handsteiner, Johannes, Krenn, Mario, Malik, Mehul, Ursin, Rupert, Zeilinger, Anton   +6 more
core   +1 more source

Population of Nonmetallic Inclusions in Liquid High‐Silicon Electrical Steel in Contact With MgO–C Refractories Based on Recyclates and Environmentally Friendly Binders

Advanced Engineering Materials, EarlyView.
The formation of nonmetallic inclusions (NMIs) was investigated in this study, carrying out immersion tests for 30 min at a temperature of 1600°C with liquid high‐silicon electrical steel (Si ≈ 3 mass‐%) and different MgO–C refractories. Conventional MgO–C refractories were considered, as well as MgO–C refractories containing MgO–C recyclate and ...
Lukas Neubert, Matheus Roberto Bellé, Florian Kerber, Dinesh Kumar Gunasekar, Hans‐Jörn Weddige, Christos G. Aneziris, Olena Volkova   +6 more
wiley   +1 more source

Development of a Ground-Based Aerial-Tracking Instrument for Open-Path Spectroscopy to Monitor Atmospheric Constituents [PDF]

, 2019
A ground-based aerial-tracking instrument, known as the Ground Tracker, designed to provide spectral data to quantify greenhouse gases is under development.
Hodges, Haden
core   +2 more sources

Observation of nitrogen vacancy photoluminescence from an optically levitated nanodiamond

, 2013
We present the first evidence of nitrogen vacancy (NV) photoluminescence from a nanodiamond suspended in a free-space optical dipole trap at atmospheric pressure. The photoluminescence rates are shown to decrease with increasing trap laser power, but are
Gieseler, Jan, Neukirch, Levi P., Novotny, Lukas, Quidant, Romain, Vamivakas, A. Nick   +4 more
core   +1 more source

Al–Cu Composite Casting of Laser‐Deoxidized Copper: Bonding, Interfacial Chemistry, and Thermal Conductivity

Advanced Engineering Materials, EarlyView.
This study investigates laser‐based oxide removal of Cu inserts in oxygen‐free conditions and examines long‐term oxidation kinetics and surface chemistry under different atmospheres via X‐ray photoelectron spectroscopy. Al–Cu compound casting with differently oxidized surfaces is performed, and intermetallic phase formation, morphology, and thermal ...
Timon Steinhoff, Finn‐Lennard Janthur, Sascha Zimmermann, Sarah Seffer, Jörg Hermsdorf, René Gustus, Ludger Overmeyer, Wolfgang Maus‐Friedrichs, Hans Jürgen Maier, Christian Klose   +9 more
wiley   +1 more source

Photosensor Characterization for the Cherenkov Telescope Array: Silicon Photomultiplier versus Multi-Anode Photomultiplier Tube

, 2013
Photomultiplier tube technology has been the photodetector of choice for the technique of imaging atmospheric Cherenkov telescopes since its birth more than 50 years ago.
Bouvier, Aurelien, Errando, Manel, Gebremedhin, Lloyd, Hidaka, Naoya, Hinton, Jim, Johnson, Caitlin, Kuznetsov, Andrey, Mukherjee, Reshmi, Otte, Nepomuk, Strausbaugh, Robert, Tajima, Hiroyasu, White, Richard, Williams, David   +12 more
core   +1 more source