Results 41 to 50 of about 74,044 (308)

Electronic spectroscopy of cold ions in a radio-frequency trap [PDF]

, 2010
The low density of ions in mass spectrometers generally precludes direct absorption measurements. The spectrum of ions can nonetheless be obtained by using resonance two-color photofragmentation or multiphoton photofragmentation techniques.
Rudnev, Vitaly S.
core   +1 more source

The Radio Astronomy Explorer Satellite, a Low‐Frequency Observatory [PDF]

Radio Science, 1971
The Radio Astronomy Explorer satellite (RAE‐1) is the first spacecraft designed exclusively for radio astronomical studies. It is a small, but relatively complex, observatory including two 229‐meter antennas, several radiometer systems covering a frequency range of 0.2 to 9.2 MHz, and a variety of supporting experiments such as antenna impedance probes
R. R. Weber, J. K. Alexander, R. G. Stone   +2 more
openaire   +1 more source

First Radio Astronomy Examination of the Low-Frequency Broadband Active Antenna Subarray

Advances in Astronomy, 2014
We present the 25-element active antenna array and its remote control in the framework of the GURT project, the Ukrainian Radio Telescope of a new age. To implement beamforming, the array is phased with the help of discrete cable delay lines in analog ...
A. A. Stanislavsky, I. N. Bubnov, A. A. Konovalenko, A. A. Gridin, V. V. Shevchenko, L. A. Stanislavsky, D. V. Mukha, A. A. Koval   +7 more
doaj   +1 more source

Test-Driven Design of an Active Dual-Polarized Log-Periodic Antenna for the Square Kilometre Array

IEEE Open Journal of Antennas and Propagation, 2020
An active dual-polarized Log-Periodic antenna has been designed to meet the requirements of the low-frequency (50 - 350 MHz) radio telescope of the Square Kilometre Array (SKA).
Pietro Bolli, Lorenzo Mezzadrelli, Jader Monari, Federico Perini, Alberto Tibaldi, Giuseppe Virone, Mirko Bercigli, Lorenzo Ciorba, Paola Di Ninni, Maria Grazia Labate, Vittorio Giuseppe Loi, Andrea Mattana, Fabio Paonessa, Simone Rusticelli, Marco Schiaffino   +14 more
doaj   +1 more source

Ultimate precision in cosmic-ray radio detection — the SKA

EPJ Web of Conferences, 2017
As of 2023, the low-frequency part of the Square Kilometre Array will go online in Australia. It will constitute the largest and most powerful low-frequency radio-astronomical observatory to date, and will facilitate a rich science programme in astronomy
Huege Tim, Bray Justin D., Buitink Stijn, Butler David, Dallier Richard, Ekers Ron D., Enßlin Torsten, Falcke Heino, Haungs Andreas, James Clancy W., Martin Lilian, Mitra Pragati, Mulrey Katharine, Nelles Anna, Revenu Benoît, Scholten Olaf, Schröder Frank G., Tingay Steven, Winchen Tobias, Zilles Anne   +19 more
doaj   +1 more source

A Low-Insertion Loss Cryogenic Edge-Mode Isolator With 18 GHz Bandwidth

IEEE Journal of Microwaves, 2023
Cryogenic isolators play an important role in low-noise receiver systems widely employed in millimeter and submillimeter telescopes. To enable a significantly wider Intermediate Frequency (IF) bandwidth, there is strong demand for a wideband, low-loss ...
Lingzhen Zeng, Cheuk-Yu Edward Tong, Scott N. Paine   +2 more
doaj   +1 more source

Instrumentation development of innovative radio-devices to improve the coming cycles of radio astronomy observations [PDF]

, 2020
Radio astronomy represents one of the most useful tools for investigating celestial objects such as sychrontronic emissions from quasar , molecular clouds in the interstellar medium, and a black hole event horizon .
Montofre, Daniel
core   +1 more source

Enhanced Terahertz Thermoelectricity Via Engineered Van Hove Singularities and Nernst Effect in Moiré Superlattices

Advanced Functional Materials, EarlyView.
Moiré band engineering in graphene/hexagonal boron nitride–based superlattices unlocks van Hove singularities (VHSs) for terahertz (THz) optoelectronics. Tuning the Fermi level near these singularities, associated with secondary neutrality points (SNPs), enhances the photothermoelectric response.
Leonid Elesin, Arthur L. Shilov, Subhajit Jana, Ilya Mazurenko, Pierre A. Pantaleon, Mikhail Kashchenko, Nikita Krivovichev, Viacheslav Dremov, Igor Gayduchenko, Takashi Taniguchi, Kenji Watanabe, Yibo Wang, Kostya S. Novoselov, Dmitry A. Svintsov, Grigory Goltsman, Elena I. Titova, Denis A. Bandurin   +16 more
wiley   +1 more source

Titanium Suboxides Responsible for Electronic Anomaly Near Room Temperature in the Ti3C2Tx MXene

Advanced Functional Materials, EarlyView.
Our multi‐technique study reveals that the near‐room‐temperature anomaly in Ti3C2Tx MXene is linked to titanium suboxide nanodomains, including Ti3O5, embedded within the MXene host. Their temperature‐driven transformation provides an alternative explanation to solvent‐ and swelling‐based models and offers new insight into the thermally activated ...
Bence G. Márkus, Bradlee J. McIntosh, Lili Vajtai, Anna Nyáry, Sándor H. Sipos, Nirmal J. Ghimire, Ferenc Simon, László Forró, Dávid Beke   +8 more
wiley   +1 more source

Electromagnetic Analysis and Experimental Validation of the LOFAR Radiation Patterns

International Journal of Antennas and Propagation, 2019
Low-frequency (
Paola Di Ninni, Pietro Bolli, Fabio Paonessa, Giuseppe Pupillo, Giuseppe Virone, Stefan J. Wijnholds   +5 more
doaj   +1 more source