Results 21 to 30 of about 14,761 (217)

High Frequency Radar Wind Turbine Interference Community Working Group Report [PDF]

, 2019
Land-based High Frequency (HF) Radars provide critically important observations of the coastal ocean that will be adversely affected by the spinning blades of utility-scale wind turbines.
Cahl, Douglas, Emery, Brian, Kirincich, Anthony R., Kosro, Mike, Roarty, Hugh, Trockel, Dale, Washburn, Libe, Whelan, Chad   +7 more
core   +1 more source

Remote Observation of a Small Meteotsunami in the Bight of Benin Using HF Radar Operating in Lower HF Band

IEEE Access, 2019
High-frequency (HF) surface-wave (SW) radar systems have demonstrated their capability to capture the signals from seismic and non-seismic tsunami events using the estimation of surface current changes. Several ocean radar systems, operating in the upper
Anna Dzvonkovskaya, Dejan Nikolic, Vladimir Orlic, Miroslav V. Peric, Nikola Tosic   +4 more
doaj   +1 more source

High-frequency ocean radar support for Tsunami Early Warning Systems

Geoscience Letters, 2018
A high-frequency (HF) ocean radar system is a shore-based remote sensing system to simultaneously monitor ocean surface currents, waves and wind far beyond the horizon.
Anna Dzvonkovskaya, Leif Petersen, Thomas Helzel, Matthias Kniephoff   +3 more
doaj   +1 more source

Absorption-Dominant Electromagnetic Interference Shielding of Ti₃C₂T_x MXene-Coated and Fe₃O₄-Integrated TPMS Composites with Coupled Gradient Conductivity and Size-Graded Structure. [PDF]

Adv Sci (Weinh)
A functionally driven variable‐cell size and gradient‐conductive coated TPMS structure was developed. Accordingly, stepwise longitudinal gradient impedance was realized, achieving absorption‐dominant EMI shielding (absorptivity≈0.85) with an EMI SET of ≈ 59 dB, for 10 mm‐thick composites. Further increasing the thickness of composites to 20 mm achieved
Kamal A, Li B, Zhang D, Syed MM, Otabil A, Shahzad F, Zheng L, Liao K.   +7 more
europepmc   +2 more sources

Measurement Characteristics of Near-Surface Currents from Ultra-Thin Drifters, Drogued Drifters, and HF Radar

Remote Sensing, 2018
Concurrent measurements by satellite tracked drifters of different hull and drogue configurations and coastal high-frequency radar reveal substantial differences in estimates of the near-surface velocity.
Steven L. Morey, Nicolas Wienders, Dmitry S. Dukhovskoy, Mark A. Bourassa   +3 more
doaj   +1 more source

Comparison of Measured Surface Currents from High Frequency (HF) and X-Band Radar in a Marine Protected Coastal Area of the Ligurian Sea: Toward an Integrated Monitoring System

Remote Sensing, 2020
Two different ground-based remote sensing instruments can be used for the near-real-time monitoring of surface waves and currents, namely the high frequency HF radar and the microwave X-band radar. The HF system reaches larger offshore distances at lower
Lyuba Novi, Francesco Raffa, Francesco Serafino   +2 more
doaj   +1 more source

Ionizing wave via high-power HF acceleration [PDF]

, 2010
Recent ionospheric modification experiments with the 3.6 MW transmitter at the High Frequency Active Auroral Research Program (HAARP) facility in Alaska led to discovery of artificial ionization descending from the nominal interaction altitude in the ...
Alterkop, Ashrafi, Bernhardt, Carlson, Dhillon, Djuth, Djuth, Evgeny Mishin, Galeev, Galeev, Gurevich, Gustavsson, Guzdar, Hedin, Majeed, Mishin, Mjølhus, Newman, Oyama, Pedersen, Pedersen, Rietveld, Todd Pedersen, Volokitin, Wang, Zakharov   +25 more
core   +1 more source

Inversion of HF Radar Doppler Spectra Using a Neural Network

Journal of Marine Science and Engineering, 2019
For a number of decades, coastal HF radar has been used to remotely measure ocean surface parameters, including waves, at distances exceeding 100 km. The information, which has value in many ocean engineering applications, is obtained using the HF radar ...
Rachael L. Hardman, Lucy R. Wyatt
doaj   +1 more source

Radar cross-section (RCS) analysis of high frequency surface wave radar targets [PDF]

, 2010
Realistic high frequency surface wave radar (HFSWR) targets are investigated numerically in terms of electromagnetic wave - target interactions. Radar cross sections (RCS) of these targets are simulated via both the finite-difference time-domain (FDTD ...
Sevgi, Levent, Çakır, Gonca
core   +1 more source

Wind Direction Inversion from Narrow-Beam HF Radar Backscatter Signals in Low and High Wind Conditions at Different Radar Frequencies

Remote Sensing, 2018
Land-based, high-frequency (HF) surface wave radar has the unique capability of monitoring coastal surface parameters, such as current, waves, and wind, up to 200 km off the coast.
Wei Shen, Klaus-Werner Gurgel
doaj   +1 more source