Results 71 to 80 of about 643,838 (299)

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

Advanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang, Weipeng Wang, Xuan Cong, Shiyu Wang, Gao Li, Sen Gong, Lin Huang, Hongxin Zeng, Yaxin Zhang, Ziqiang Yang   +9 more
wiley   +1 more source

A Computationally Efficient Estimator for the Target Angle, Delay, and Doppler Parameters in Passive Radar

International Journal of Antennas and Propagation, 2023
The azimuth, elevation, time delay (TD), and Doppler shift (DS) of the target echo signal are important parameters for target localization in passive radar.
Jing Yang, Chengcheng Liu, Jie Huang, Dapeng Liu, Ting Ding, Jiandong Zhu, Xia Li   +6 more
doaj   +1 more source

Doppler lidar observations of sensible heat flux and intercomparisons with a ground-based energy balance station and WRF model output

, 2009
This is an open access article - Copyright @ 2009 E. Schweizerbart'sche VerlagsbuchhandlungDuring the Convective and Orographically induced Precipitation Study (COPS), a scanning Doppler lidar was deployed at Achern, Baden-Wüttemberg, Germany from 13th ...
Fay Davies, Collier, CG, Davis, JC, Christopher G. Clare Collier, Russell, A, Jenny Davis, Andrew Russell, Pearson, GN, Davies, F, Guy N. Pearson, Ralph Burton, Burton, R   +11 more
core   +1 more source

WAMDII: wide-angle Michelson Doppler imaging interferometer for Spacelab [PDF]

, 1985
A wide-angle Michelson Doppler imaging interferometer (WAMDII) is described that is intended to measure upper atmospheric winds and temperatures from naturally occurring visible region emissions, using Spacelab as a platform.
Gault, W.A., Kendall, D.J.W., Wimperis, J.R., Miller, D.W., Haslett, J.W., Kosteniuk, P.R., Johnston, S.F., Sheperd, G.G., Pasturczyk, Z.   +8 more
core   +1 more source

Ultrasonic Rainbow: A Meta‐Transducer for Frequency‐Selective Elastic Wave Control via Dithering‐Based Wavenumber Tuning

Advanced Intelligent Systems, EarlyView.
A piezoelectric meta‐transducer generates an ultrasonic rainbow, steering guided elastic waves to different angles according to frequency. A dithering‐based binary electrode design enables a closer realization of the target wavenumber filter, improving directional purity and suppressing unwanted lobes. Numerical and experimental validation demonstrates
Masoud Mohammadgholiha, Jochen Moll, Kilian Tschöke, Carsten Kruska, Sylvia E. Gebhardt, Luca De Marchi   +5 more
wiley   +1 more source

On Global Exponential Stability Preservation under Sampling for Globally Lipschitz Delay-Free and Retarded Systems

, 2016
The paper shows that the global exponential stability property is preserved, under suitable fast sampling, whenever the dynamics of the system at hand is described by globally Lipschitz functions.
Fridman, E., PEPE, PIERDOMENICO
core   +1 more source

Single camera 3D planar velocity measurements using imaging fibre bundles and two frequency Planar Doppler Velocimetry (2nu-PDV) [PDF]

, 2005
3D planar flow-field measurements are made using multiple imaging fibre bundles to port different views of the measurement plane, defined by a laser light sheet, to a CCD camera.
Charrett, Thomas O. H., H. D. Ford, Ralph P. Tatam, Tatam, Ralph P., T. O. Charrett, Ford, Helen D.   +5 more
core   +1 more source

Prenatal Evaluation of RNU4‐2 Variants in Fetuses With Central Nervous System Anomalies

American Journal of Medical Genetics Part C: Seminars in Medical Genetics, EarlyView.
ABSTRACT Fetal central nervous system (CNS) anomalies are among the most common congenital malformations, yet the overall prenatal diagnostic yield of current genetic testing remains below 40%. Variants in RNU4‐2, a non‐coding gene encoding the U4 small nuclear RNA (snRNA), have recently been linked to a novel highly recurrent dominant ...
Yiyao Chen, Li Gao, Xu Han, Yunyun Cao, Lanlan Zhang, Yi Wu, Xinrong Zhao, Wenjing Hu, Ruiyu Ma, Renyi Hua, Niu Li, Yanlin Wang, Jian Wang, Shuyuan Li   +13 more
wiley   +1 more source

Recent Advances in Stimulated Brillouin Scattering in Integrated Photonics

Advanced Physics Research, EarlyView.
This review systematically surveys recent advances in stimulated Brillouin scattering (SBS) within integrated photonics. It begins by elucidating the fundamental mechanisms of stimulated coupling between photons and acoustic phonons in nanoscale waveguides, enhanced by the photoelastic and moving boundary effects.
Songyue Liu, Qi Lu, Pan Hu, Yuan Zhong, Yu He, Yaojing Zhang, Young‐Ik Sohn, Yikai Su, Lu Sun   +8 more
wiley   +1 more source

Discrete radar based on modulo arithmetic

EURASIP Journal on Advances in Signal Processing
Zak-OTFS is a modulation scheme where signals are formed in the delay–Doppler (DD) domain, converted to the time domain (DD) for transmission and reception, then returned to the DD domain for processing.
Nishant Mehrotra, Sandesh Rao Mattu, Saif Khan Mohammed, Ronny Hadani, Robert Calderbank   +4 more
doaj   +1 more source