Results 31 to 40 of about 123,093 (174)

Optimized Trigger for Ultra-High-Energy Cosmic-Ray and Neutrino Observations with the Low Frequency Radio Array [PDF]

, 2011
When an ultra-high energy neutrino or cosmic ray strikes the Lunar surface a radio-frequency pulse is emitted. We plan to use the LOFAR radio telescope to detect these pulses.
Anderson, J. M., Arts, M., Asgekar, A., Avruch, M., Bell, M., Bennema, P., Bentum, M., Bernadi, G., Best, P., Boonstra, A. -J., Bregman, J., Broekema, C., Brouw, W., Brueggen, M., Buitink, S., Butcher, H., Ciardi, B., Coolen, A., Damstra, S., de Jong, A., de Reijer, J., de Vos, M., Dettmar, R., Dijkstra, K., Donker, P., Doorduin, A., Drost, M., Eisloeffel, J., Falcke, H., Garrett, M., Gerbers, M., Griessmeier, J., Grit, T., Gruppen, P., Gunst, A., Hoeft, M., Holties, H., Horandel, J., Horneffer, L. A., Huijgen, A., James, C., Kant, D., Kooistra, E., Koopman, Y., Koopmans, L., Kuper, G., Lambropoulos, P., Loose, M., Maat, P., Mallary, C., McFadden, R., Meulman, H., Mevius, M., Mol, J. -D., Morawietz, J., Mulder, E., Munk, H., Nieuwenhuis, L., Nijboer, R., Noordam, J., Norden, M., Overeem, R., Paas, H., Pandey, V. N., Pandey-Pommier, M., Pizzo, R., Polatidis, A., Reich, W., Renting, A., Riemers, P., Roettgering, H., Romein, J., Roosjen, J., Ruiter, M., Schoenmakers, A., Scholten, O., Schoonderbeek, G., Singh, K., Sluman, J., Smirnov, O., Stappers, B., Steinmetz, M., Stiepel, H., Stuurwold, K., Tagger, M., Tang, Y., ter Veen, S., van Ardenne, A., van Cappellen, W., van de Brink, R., van der Wal, E., van Diepen, G., van Duin, A., van Haarlem, M., van Leeuwen, J., van Zwieten, J., Vermeulen, R., Vogt, C., Weggemans, H., Wijnholds, S., Wise, M., Wucknitz, O., Yattawatta, S.   +102 more
core   +6 more sources

Rapid Electro‐Thermal Micro‐Actuation of Flat Optics Enabled by Laser‐Induced Graphene on Colorless Polyimide Substrates

Advanced Optical Materials, EarlyView.
Laser‐induced graphene (LIG) on a colorless polyimide (CPI) substrate functions as both an electrical heater and a heat spreader, enabling rapid electro‐thermo‐optic actuation. The system achieves reflective beam scanning up to 2 kHz and diffractive beam steering with 0.5‐millidegree resolution and a 0.9 s response time, showcasing LIG‐CPI as a soft ...
Byunggi Kim, Younggeun Lee, Dongwook Yang, Kazuyoshi Fushinobu, Young‐Jin Kim, Masahiro Nomura   +5 more
wiley   +1 more source

Commensal observing with the Allen Telescope array: software command and control

, 2010
The Allen Telescope Array (ATA) is a Large-Number-Small-Diameter radio telescope array currently with 42 individual antennas and 5 independent back-end science systems (2 imaging FX correlators and 3 time domain beam formers) located at the Hat Creek ...
Ackermann, Robert, Barott, William C., Gutierrez-Kraybill, Colby, Harp, Gerald, Keating, Garrett K., Kilsdonk, Tom, MacMahon, David, Richards, Jon, Williams, Peter K. G.   +8 more
core   +1 more source

The MeerKAT Radio Telescope [PDF]

Proceedings of MeerKAT Science: On the Pathway to the SKA — PoS(MeerKAT2016), 2018
This paper is a high-level description of the development, implementation and initial testing of the MeerKAT radio telescope and its subsystems. The rationale for the design and technology choices is presented in the context of the requirements of the MeerKAT Large-scale Survey Projects.
openaire   +1 more source

Radio galaxies with the Cherenkov Telescope Array [PDF]

Astroparticle Physics, 2017
Misaligned AGN (MAGNs), i.e., radio-loud AGNs with the jet not pointing directly towards us, represent a new class of GeV emitters revealed by the Fermi space telescope. Although they comprise only a small fraction of the high-energy sources, MAGNs are extremely interesting objects offering a different perspective to study high-energy processes with ...
Jürgen Knödlseder, R. Angioni, R. Angioni, Paola Grandi, Cristian Vignali, Eleonora Torresi   +5 more
openaire   +4 more sources

Design of Waveguide NbN‐Based Superconductor–Insulator–Superconductor Mixer for 650 GHz

Advanced Photonics Research, EarlyView.
This research work focuses on a waveguide NbN‐based superconductor–insulator–superconductor mixer operating at 650 GHz. The signal coupling circuit is designed using a waveguide‐microstrip coupling structure, and the return loss obtained is lower than −16 dB. For the mixing circuit, its return loss is less than −7.5 dB, and the return loss reduces with
Lianhao He, Fangting Lin, Xiaoyong He
wiley   +1 more source

Productivity and Impact of Radio Telescopes [PDF]

Publications of the Astronomical Society of the Pacific, 2006
In 2001, 836 papers appearing in 15 journals reported and/or analyzed data collected with ground-based radio, millimeter, and submillimeter telescopes, plus the HALCA, COBE, and SWAS satellites and a few balloon-borne detectors. More than 80 telescopes were represented, including 36 that were each responsible for five or more papers.
Trimble, Virginia, Zaich, Paul
openaire   +4 more sources

Optical Wireless Communications with Metasurfaces: Current Status and Potential for Intelligent Communications

Advanced Photonics Research, EarlyView.
Optical wireless communications (OWCs) provide a promising alternative to spectrum‐congested microwave wireless communications. Recently, the use of metasurfaces with sub‐wavelength features for dynamic beam steering, beam manipulation, and spatial or optical‐angular‐momentum mode generation, conversion, and multiplexing in OWCs is proposed and ...
Ke Wang, Chengwei Fang, Md Osman Ali, Xiaojun Chen, Safa Alghadi, Shuo Li, Jiayuan He, Sithamparanathan Kandeepan   +7 more
wiley   +1 more source

Vision‐Assisted Avocado Harvesting with Aerial Bimanual Manipulation

Advanced Robotics Research, EarlyView.
This work outlines the design and implementation of a bimanual aerial robot that employs visual perception and learning to detect, reach, and harvest avocados. A new gripper and fixer arm assembly is used to harvest avocados, while visual perception enables the detection of avocados and estimation of their position and orientation for determining ...
Zhichao Liu, Jingzong Zhou, Caio Mucchiani, Konstantinos Karydis   +3 more
wiley   +1 more source

Natural Crystal Structure for Generating Raman‐Like Orbital Angular Momentum States

Advanced Science, EarlyView.
This work proposes a strategy for symmetry breaking of the degenerate OAM states relying on the natural anisotropy of crystal gain, to select the handedness of the spatial spiral phase front and further tunable Raman‐like OAM states by thermal‐driven, which clarifies the contribution of intrinsic crystal property to the OAM states and opens a new route
Tianxiang Meng, Changsheng Zheng, Yongguang Zhao, Haohai Yu, Huaijin Zhang   +4 more
wiley   +1 more source