Results 31 to 40 of about 3,353,562 (125)
Frequency stabilization of the non resonant wave of a continuous-wave singly resonant optical parametric oscillator [PDF]
, 2015 We present an experimental technique allowing to stabilize the frequency of the non resonant wave in a singly resonant optical parametric oscillator (SRO) down to the kHz level, much below the pump frequency noise level. By comparing the frequency of the non resonant wave with a reference cavity, the pump frequency noise is imposed to the frequency of ...
arxiv +1 more source
HTsort: Enabling Fast and Accurate Spike Sorting on Multi-Electrode Arrays
Frontiers in Computational Neuroscience, 2021 Spike sorting is used to classify the spikes (action potentials acquired by physiological electrodes), aiming to identify their respective firing units. Now it has been developed to classify the spikes recorded by multi-electrode arrays (MEAs), with the ...
Keming Chen +5 more
doaj +1 more source
Frequency Dynamic Convolution: Frequency-Adaptive Pattern Recognition for Sound Event Detection [PDF]
arXiv, 2022 2D convolution is widely used in sound event detection (SED) to recognize two dimensional time-frequency patterns of sound events. However, 2D convolution enforces translation equivariance on sound events along both time and frequency axis while frequency is not shift-invariant dimension.
arxiv
Dependence of synchronisation frequency of Kuramoto oscillators on symmetry of natural frequency distribution [PDF]
Pramana 83 (2014) 945-953, 2014 Kuramoto oscillators have been proposed earlier as a model for interacting systems that exhibit synchronisation. In this article we study the difference between networks with symmetric and asymmetric distribution of natural frequencies. We first indicate that the synchronisation frequency of the oscillators is independent of the natural frequency ...
arxiv +1 more source
Size-Prior-Oriented Target Detection and Recognition for Automotive SAR
IEEE Journal of Selected Topics in Applied Earth Observations and Remote SensingAutomotive SAR target detection, which involves interpreting scenes or distinguishing different objects from SAR images, is a fundamental and critical problem in intelligent driving. An increasing number of methods have been proposed in airbone-SAR image
Zekang Fan +5 more
doaj +1 more source
Electronics Letters, 2019 The authors propose a control method based on the downhill simplex (Nelder–Mead) method for adaptive optical filters used for channel equalisation in optical communication systems.
L. Baudzus, P.M. Krummrich
doaj +1 more source
IET Microwaves, Antennas & Propagation, 2022 A high gain vertically polarised travelling‐wave frequency scanning array antenna fed by a meander rectangular waveguide is presented for Ku‐band operation.
Taher Badawy +3 more
doaj +1 more source
Parametric frequency mixing in the magneto-elastically driven FMR-oscillator [PDF]
Phys. Rev. B 95, 060409 (2017), 2016 We demonstrate the nonlinear frequency conversion of ferromagnetic resonance (FMR) frequency by optically excited elastic waves in a thin metallic film on dielectric substrates. Time-resolved probing of the magnetization directly witnesses magneto-elastically driven second harmonic generation, sum- and difference frequency mixing from two distinct ...
arxiv +1 more source
A circular switched parasitic array with directors for LoRa applications at 868 MHz
Electronics LettersThe integration of directive elements into a circular switched parasitic array at 868 MHz is presented. The typical usage of reflective parasitic monopoles is supplemented with additional, shorter monopole elements which are positioned closer to the ...
Lukas Reinhold +2 more
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Signatures of odd-frequency correlations in the Josephson current of superconductor/ferromagnet hybrid junctions [PDF]
Phys. Rev. B 92, 094509 (2015), 2015 Contacting a bilayer ferromagnet with a singlet even-frequency superconductor allows for the realization of an effective triplet odd-frequency superconductor. In this work, we investigate the Josephson effect between superconductors with different symmetries (e.g. odd- versus even-frequency). In particular, we study the supercurrent flowing between two
arxiv +1 more source