Results 91 to 100 of about 13,528 (217)

Leveraging Sparse Autoencoders to Reveal Interpretable Features in Geophysical Models

Journal of Geophysical Research: Machine Learning and Computation, Volume 2, Issue 4, December 2025.
Abstract Machine learning is an increasingly popular tool in the geosciences, offering new approaches to numerical weather prediction and complex data set analysis. However, as reliance on these techniques grows, pressing questions about model transparency, internal biases, and trust emerge.
Fraser King, Claire Pettersen, Derek Posselt, Sarah Ringerud, Yan Xie   +4 more
wiley   +1 more source

Hybrid LiDAR–radar at 9 μm wavelength with unipolar quantum optoelectronic devices

Nanophotonics, Volume 14, Issue 21, Page 3407-3413, 02 October 2025.
Abstract Unipolar quantum optoelectronics is emerging as a promising semiconductor platform for developing mid‐infrared applications, particularly spectroscopy and free‐space communications. In this work, we present a proof of principle of a unipolar quantum optoelectronic hybrid Lidar – Radar for the measurement of the position and speed of a moving ...
Livia Del Balzo, Djamal Gacemi, Jihye Baik, Bruno Martin, Axel Evirgen, Grégoire Beaudoin, Konstantinos Pantzas, Isabelle Sagnes, Angela Vasanelli, Carlo Sirtori   +9 more
wiley   +1 more source

Illuminating Advances in Materials: Optical Physical Unclonable Functions for Security Applications

Advanced Optical Materials, Volume 13, Issue 29, October 13, 2025.
This review highlights Optical Physical Unclonable Functions (OPUFs) as secure, light‐driven authentication tools. It surveys material platforms including optical fibers, low‐dimensional materials, luminophores, plasmonic nanoparticles and rare earth OPUFs systems.
Syeda Ramsha Ali, Stephen V. Kershaw, Mian Muhammad Faisal, Basel Halak, Nema M. Abdelazim   +4 more
wiley   +1 more source

Metasurface Doppler Cloak for Broadband Radar Stealth

Advanced Physics Research, Volume 4, Issue 10, October 2025.
Suppressing the motion‐induced Doppler shift passes the target as part of the static clutter which is ignored by radars. Using a simple time‐modulation, frequency conversion is obtained from a metasurface‐based solution over a wide range. Referred to as a Doppler cloak, this work expands and validates such a varactor‐loaded prototype for broadband ...
Tanguy Lopez, Thomas Lepetit, Badreddine Ratni, Shah Nawaz Burokur   +3 more
wiley   +1 more source

Design of Modular FMCW Radar and Quantization of Its Range Error

Sakarya University Journal of Computer and Information Sciences, 2018
This study presents experimental analysis of range error of modular FMCW (frequency modulated continuous wave) radar operating at C-band. As FMCW utilizes frequency modulation, it can measure both range and speed of targets.
Emre Uzundurukan, Ali Kara, Mahfoud Y. A. Abdulrazıgh   +2 more
doaj   +1 more source

Space Vector‐Signal Generator Based on High‐Order Amplitude‐Phase Modulated Programmable Metasurface

Small Structures, Volume 6, Issue 10, October 2025.
A high‐order amplitude‐phase modulated metasurface offers precise amplitude and phase control, enabling a spatial vector‐signal generator for efficient baseband and complex signal generation. This innovative approach enhances flexibility and dynamic adaptability in RF modulation, demonstrating significant potential for high‐speed wireless communication,
Zhen Jie Qi, Shao Nan Chen, Jun Yan Dai, Jun Wei Zhang, Li Jie Wu, Hui Dong Li, Tie Jun Cui, Qiang Cheng   +7 more
wiley   +1 more source

FMCW Interference Waveform Estimation Based on Intentional Local Interference for Automotive Radars [PDF]

Journal of Electromagnetic Engineering and Science
We propose a new method to estimate the waveforms of frequency-modulated continuous-wave (FMCW) interferers by intentional interference. The proposed method utilizes the crossing interference of FMCW radar by adaptive waveform configuration.
Sungpil Cheon, Hyungwoo Kim, Byungkwan Kim   +2 more
doaj   +1 more source

Conveyor belt clock synchronization

, 2004
A protocol for synchronizing distant clocks is proposed that does not rely on the arrival times of the signals which are exchanged, and an optical implementation based on coherent-state pulses is described.
A. Einstein, A. S. Eddington, E. Dauler, Franco N. C. Wong, G. R. Osche, Jeffrey H. Shapiro, L. Mandel, Lorenzo Maccone, M. I. Skolnik, Seth Lloyd, Vittorio Giovannetti   +10 more
core   +1 more source

FMCW-based contactless heart rate monitoring

Scientific Reports
Heart disease is a significant global health issue. Traditional methods for heart rate monitoring typically require close physical contact, which limits the continuity and convenience of monitoring. To achieve real-time, non-contact heartbeat monitoring, researchers have introduced millimeter-wave radar technology.
Zhanjun Hao, Yifei Gao, Yangyang Tang, Yue Wang, Kai Fan, Fenfang Li   +5 more
openaire   +3 more sources

Long-wave infrared FMCW ranging systems based on external coherent detection and self-mixing interferometry [PDF]

EPJ Web of Conferences
Long-wave infrared (LWIR) wavelengths are expected to provide a better robustness against meteorological perturbations as well as an increased covertness for hard target FMCW LiDAR. However, the implementation and modulation of LWIR sources and detectors
Martin Bruno, Feneyrou Patrick, Mignon Quentin LE, Gacemi Djamal, Berthou Nicolas, Martin Aude, Morvan Loïc, Sirtori Carlo   +7 more
doaj   +1 more source