Results 31 to 40 of about 333,575 (254)

Photonics-Assisted Bandwidth-Doubling Dual-Chirp Microwave Signal Generation With Freely-Tunable Central Frequency

open access: yesIEEE Photonics Journal, 2020
A photonics-assisted dual-chirp microwave signal generation scheme is proposed based on electro-optic modulation and heterodyne detection. The dual-chirp microwave signal is generated by heterodyne beating between a dual-chirp optical waveform and a ...
Lingjie Zhang   +7 more
doaj   +1 more source

Oversampling Increases the Pre-Log of Noncoherent Rayleigh Fading Channels [PDF]

open access: yes, 2014
We analyze the capacity of a continuous-time, time-selective, Rayleigh block-fading channel in the high signal-to-noise ratio (SNR) regime. The fading process is assumed stationary within each block and to change independently from block to block ...
Durisi, Giuseppe   +4 more
core   +3 more sources

Distilling Quantum Entanglement via Mode-Matched Filtering

open access: yes, 2011
We propose a new avenue towards distillation of quantum entanglement that is implemented by directly passing the entangled qubits through a mode-matched filter.
D. Splepian   +3 more
core   +1 more source

A multifrequency method based on the Matched Multifilter for the detection of point sources in CMB maps [PDF]

open access: yes, 2009
In this work we deal with the problem of simultaneous multifrequency detection of extragalactic point sources in maps of the Cosmic Microwave Background. We apply a linear filtering technique that uses spatial information and the cross-power spectrum. To
Barreiro   +63 more
core   +2 more sources

An Improved Azimuth Angle Estimation Method with a Single Acoustic Vector Sensor Based on an Active Sonar Detection System

open access: yesSensors, 2017
In this paper, an improved azimuth angle estimation method with a single acoustic vector sensor (AVS) is proposed based on matched filtering theory. The proposed method is mainly applied in an active sonar detection system.
Anbang Zhao, Lin Ma, Xuefei Ma, Juan Hui
doaj   +1 more source

Hyperspectral Sensors as a Management Tool to Prevent the Invasion of the Exotic Cordgrass Spartina densiflora in the Doñana Wetlands

open access: yesRemote Sensing, 2016
We test the use of hyperspectral sensors for the early detection of the invasive dense-flowered cordgrass (Spartina densiflora Brongn.) in the Guadalquivir River marshes, Southwestern Spain.
Javier Bustamante   +6 more
doaj   +1 more source

Detection of Gravitational Waves from Eccentric Compact Binaries [PDF]

open access: yes, 1999
Coalescing compact binaries have been pointed out as the most promising source of gravitational waves for kilometer-size interferometers such as LIGO. Gravitational wave signals are extracted from the noise in the detectors by matched filtering.
Martel, Karl
core   +2 more sources

The (Glg)ABCs of cyanobacteria: modelling of glycogen synthesis and functional divergence of glycogen synthases in Synechocystis sp. PCC 6803

open access: yesFEBS Letters, EarlyView.
We reconstituted Synechocystis glycogen synthesis in vitro from purified enzymes and showed that two GlgA isoenzymes produce glycogen with different architectures: GlgA1 yields denser, highly branched glycogen, whereas GlgA2 synthesizes longer, less‐branched chains.
Kenric Lee   +3 more
wiley   +1 more source

Waveform engineering analysis of photoacoustic radar chirp parameters for spatial resolution and SNR optimization

open access: yesPhotoacoustics, 2019
Recent developments in photoacoustics have witnessed the implementation of a radar matched-filtering methodology into the continuous wave photoacoustic modality. The main merit of using matched filtering in continuous photoacoustics is the improvement in
Zuwen Sun   +2 more
doaj   +1 more source

Estimating inundation of small waterbodies with sub‐pixel analysis of Landsat imagery: long‐term trends in surface water area and evaluation of common drought indices

open access: yesRemote Sensing in Ecology and Conservation, 2021
Small waterbodies are numerically dominant in many landscapes and provide several important ecosystem services, but automated measurement of waterbodies smaller than a standard Landsat pixel (0.09 ha) remains challenging.
Ibrahima Sall   +5 more
doaj   +1 more source

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