Results 31 to 40 of about 6,360,569 (404)

Evaluation of optical fibre sensors in the electrical domain [PDF]

Journal of Sensors and Sensor Systems, 2020
Optical fibre sensors cover a wide range of applications. They offer versatile advantages including resilience to electromagnetic interference, biocompatibility and chemical resistivity.
U. Nordmeyer, N. Neumann, X. Wang, D. Plettemeier, T. Thiel, K. Kojucharow   +5 more
doaj   +1 more source

Rydberg Atom Sensors in Multichromatic Radio Frequency Fields [PDF]

arXiv, 2023
Rydberg atom-based sensors are a new type of radio frequency sensor that is inherently quantum mechanical. Several configurations of the sensor use a local oscillator to determine the properties of the target radio frequency field. We explain how the physics of Rydberg atom-based sensors in two or more radio frequency fields can be precisely described ...
arxiv  

Frequencies for Radio Astronomy [PDF]

Nature, 1970
At present the scope of research in radio astronomy is limited by the allocation of frequencies, some of which have to be shared with other radio services. When the International Telecommunications Union reconsiders all frequency allocations next year, astronomers are hoping for an improvement.
openaire   +3 more sources

Low-frequency radio absorption in Cassiopeia A [PDF]

Astronomy & Astrophysics, 2018
Context.Cassiopeia A is one of the best-studied supernova remnants. Its bright radio and X-ray emission is due to shocked ejecta. Cas A is rather unique in that the unshocked ejecta can also be studied: through emission in the infrared, the radio-active decay of44Ti, and the low-frequency free-free absorption caused by cold ionised gas, which is the ...
Michel Tagger, Emanuela Orrú, W. N. Brouw, W. N. Brouw, Olaf Wucknitz, Jochen Eislöffel, George Heald, George Heald, George Heald, R. Pekal, M. H. D. van der Wiel, A. J. van der Horst, Marian Soida, Harvey Butcher, Satyendra Thoudam, Henk Mulder, John McKean, John McKean, J. W. Broderick, A. S. van Amesfoort, P. C. G. van Dijk, V. N. Pandey, V. N. Pandey, Martin Bell, D. McKay-Bukowski, D. McKay-Bukowski, P. Salas, Philip Best, M. A. Garrett, M. A. Garrett, E. de Geus, Rainer Beck, H. Paas, R. Blaauw, A. W. Gunst, Anna Nelles, M. C. Toribio, M. C. Toribio, M. Iacobelli, J. B. R. Oonk, J. B. R. Oonk, M. P. van Haarlem, Gottfried Mann, Pietro Zucca, B. Ciardi, Frank Breitling, Andrzej Krankowski, M. Arias, Jason W. T. Hessels, Jason W. T. Hessels, Ralph A. M. J. Wijers, Hanna Rothkaehl, M. Pandey-Pommier, A. G. Polatidis, P. Zarka, J.-M. Grießmeier, Jacco Vink, Jacco Vink, J. van Leeuwen, R. J. van Weeren, H. J. A. Röttgering, Matthias Steinmetz, S. Duscha, Christian Vocks, Roberto Pizzo, E. Juette, Dominik J. Schwarz, Oleg Smirnov, Jörg R. Hörandel, H. A. Holties, Marcus Brüggen, J. M. Anderson, Mark J. Bentum, Mark J. Bentum, Adam Deller, Adam Deller, W. Reich, F. de Gasperin, F. de Gasperin   +78 more
openaire   +16 more sources

Radio-Frequency Single-Electron Refrigerator [PDF]

, 2006
We propose a cyclic refrigeration principle based on mesoscopic electron transport. Synchronous sequential tunnelling of electrons in a Coulomb-blockaded device, a normal metal-superconductor single-electron box, results in a cooling power of $\sim k_ ...
F. Pobell, Francesco Giazotto, H. Pothier, Jukka P. Pekola, L. E. Reichl, Olli-Pentti Saira, P. M. Ostrovsky   +6 more
core   +2 more sources

Practical challenges in data‐driven interpolation: Dealing with noise, enforcing stability, and computing realizations

International Journal of Adaptive Control and Signal Processing, EarlyView., 2023
Summary In this contribution, we propose a detailed study of interpolation‐based data‐driven methods that are of relevance in the model reduction and also in the systems and control communities. The data are given by samples of the transfer function of the underlying (unknown) model, that is, we analyze frequency‐response data.
Quirin Aumann, Ion Victor Gosea
wiley   +1 more source

Radio Frequency Interference Mitigation at the WSRT [PDF]

The Astronomical J.,128, 933, 2004 August, 2010
The sensitivity of radio astronomical stations is often limited by man-made radio frequency interference (RFI) due to a variety of terrestrial activities. An RFI mitigation subsystem (RFIMS) based on real-time digital signalprocessing is proposed here for the Westerbork Synthesis Radio Telescope based on a powerful field programmable gate array ...
arxiv   +1 more source

Radio Frequency Changers [PDF]

Proceedings of the IRE, 1915
Starting with the principle that a coil (or capacity) rotating in a single phase alternating magnetic (or electric) field, may be regarded as producing a magnetic (or electric) field rotating with double frequency, a number of frequency doublers and multipliers of magnetic and electric nature are described.
openaire   +3 more sources

Radio Frequency Magneto-Optical Trapping of CaF with High Density. [PDF]

Physical Review Letters, 2017
We demonstrate significantly improved magneto-optical trapping of molecules using a very slow cryogenic beam source and either rf modulated or dc magnetic fields. The rf magneto-optical trap (MOT) confines 1.0(3)×10^{5} CaF molecules at a density of 7(3)×
L. Anderegg, B. Augenbraun, E. Chae, B. Hemmerling, N. Hutzler, A. Ravi, A. Collopy, Jun Ye, W. Ketterle, J. Doyle   +9 more
semanticscholar   +1 more source

Data‐driven performance metrics for neural network learning

International Journal of Adaptive Control and Signal Processing, EarlyView., 2023
Summary Effectiveness of data‐driven neural learning in terms of both local mimima trapping and convergence rate is addressed. Such issues are investigated in a case study involving the training of one‐hidden‐layer feedforward neural networks with the extended Kalman filter, which reduces the search for the optimal network parameters to a state ...
Angelo Alessandri, Mauro Gaggero, Marcello Sanguineti   +2 more
wiley   +1 more source