Results 71 to 80 of about 3,059,110 (191)
Passive Bistatic Ground-Based Synthetic Aperture Radar: Concept, System, and Experiment Results
Remote Sensing, 2019 A passive bistatic ground-based synthetic aperture radar (PB-GB-SAR) system without a dedicated transmitter has been developed by using commercial-off-the-shelf (COTS) hardware for local-area high-resolution imaging and displacement measurement purposes.
Weike Feng +5 more
doaj +1 more source
Laser frequency stabilization using a spatially multiplexed microfabricated Rb vapor cell
Applied Physics ExpressWe demonstrate a laser stabilization based on a spatially-multiplexed, microfabricated rubidium vapor cell. This design integrates multiple optical apertures within a cell, enabling a single input beam to simultaneously capture both Doppler-broadened and
Seji Kang +12 more
doaj +1 more source
Time-frequency analysis of locally stationary Hawkes processes
, 2017 Locally stationary Hawkes processes have been introduced in order to generalise classical Hawkes processes away from stationarity by allowing for a time-varying second-order structure.
Roueff, François, Von Sachs, Rainer
core
Surface Acoustic Wave Sensors for the Detection of Hazardous Compounds in Indoor Air
Proceedings, 2017 In this work, the authors show the capabilities of Surface Acoustic Wave (SAW) devices coupled with various absorbents to probe the properties of gas sensitive materials for the manufacturing of hazardous gas sensors.
Meddy Vanotti +10 more
doaj +1 more source
Measuring comovement in the time-frequency space [PDF]
The measurement of comovement among variables has a long tradition in the economic and financial literature. Traditionally, comovement is assessed in the time domain through the well-known correlation coefficient while the evolving properties are ...
António Rua
core
AIP AdvancesIon traps serve as the venue for confining ions and exciting ionic transitions in ion optical clocks, where the geometric dimensions of the electrodes within the ion trap directly impact the performance metrics of the ion optical clocks.
Chaowei Wang +3 more
doaj +1 more source
Time-Frequency Representations [PDF]
Choice Reviews Online, 1996 Richard Tolimieri, Myoung An
openaire +2 more sources
Prospective Optical Lattice Clocks in Neutral Atoms with Hyperfine Structure
AtomsOptical lattice clocks combine the accuracy and stability required for next-generation frequency standards. At the heart of these clocks are carefully engineered optical lattices tuned to a wavelength where the differential AC Stark shift between ground ...
Tobias Bothwell
doaj +1 more source
Integrated multi-port multi-wavelength coherent optical source for beyond Tb/s optical links
Nature CommunicationsMicrocomb-based sources formed by placing an integrated demultiplexer with an ultra-low power consumption after an efficient optical frequency comb play a key role in many large-scale optical links for data centers and AI systems.
Ali Pirmoradi +6 more
doaj +1 more source
Time frequency requirements for radio interferometric earth physics [PDF]
Two systems of VLBI (Very Long Baseline Interferometry) are now applicable to earth physics: an intercontinental baseline system using antennas of the NASA Deep Space Network, now observing at one-month intervals to determine UTI for spacecraft ...
Fliegel, H. F., Thomas, J. B.
core +1 more source