Results 21 to 30 of about 232 (143)

Recovery Following Recurrent Fires Across Mediterranean Ecosystems. [PDF]

Glob Chang Biol
Mediterranean ecosystems worldwide are frequently affected by fires. Focusing on areas that burned two times over the past 22 years, we study the post‐fire dynamics, applying a statistical model to the time‐series of a remotely sensed proxy for vegetation cover.
Ermitão T, Gouveia CM, Bastos A, Russo AC.   +3 more
europepmc   +2 more sources

A New Approach to OTH Main Parameters Determination [PDF]

Radioengineering, 2019
In this work, we propose a method based on a simulation that incorporates several models to provide the set of parameters needed on Over-The-Horizon radars (OTHR) performance evaluation, which consists in a versatile software tool.
Z. Saavedra, J. N. Argota, M. A. Cabrera, A. G. Elias   +3 more
doaj  

Quantifying Errors in the Midpoint Transform Applied to Oblique Ionograms

Radio Science, Volume 61, Issue 7, July 2026.
Abstract It is important to specify the state of the ionosphere for Over‐the‐Horizon communications and surveillance. Both vertical and oblique ionograms provide valuable data to this end. Oblique ionograms can probe the ionosphere in locations where it would be impractical to build a vertical ionosonde, but their measurements are not straightforward ...
Joe Hughes, L. J. Nickisch, Sergey Fridman, Gregory Bullock, Shawn Kraut, Matt Hogan, Victoriya Forsythe   +6 more
wiley   +1 more source

Tracking Water Dynamics of a Temperate Forest Under Drought and Non‐Drought Conditions Using Active and Passive Microwave and Optical Remote Sensing

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 5, May 2026.
Abstract Water status, water dynamics, and ecohydrological resilience of a protected German beech forest during the 2018–2020 multi‐year drought are assessed using over six years of multi‐frequency remote sensing data, integrating active, passive, and optical sensors with varying canopy penetration depths, highlighting the importance of monitoring ...
Florian M. Hellwig, Anke Fluhrer, Clémence Dubois, Konstantin Schellenberg, David Chaparro, Markus Zehner, Anne Klosterhalfen, María Piles, Christiane Schmullius, Harald Kunstmann, Thomas Jagdhuber   +10 more
wiley   +1 more source

Multiscale Assessment of the Water Balance Components in Arizona Simulated by the National Water Model

JAWRA Journal of the American Water Resources Association, Volume 62, Issue 1, February 2026.
ABSTRACT Arizona, located in the Desert Southwest of the U.S., faces chronic water scarcity and has been strongly affected by the multidecadal Millennium Drought. As the state increasingly turns to water augmentation strategies, accurate, high‐resolution estimates of water balance components are essenctial.
Abdul Moiz, Giuseppe Mascaro
wiley   +1 more source

The First Results of Ionospheric Skywave Propagation Experiment Over Taiwan

Radio Science, Volume 61, Issue 1, January 2026.
Abstract An ionospheric over‐the‐horizon propagation experiment was carried out in Taiwan to investigate characteristics of ionospheric F layer skywave propagation at frequencies 4–12 MHz. Experimental results show that there are prominent diurnal variations in the incident angle, virtual height and plasma frequency at reflection height, which are ...
Hung‐Shi Lin, Ching‐Lun Su, Kang‐Hung Wu, Yen‐Hsyang Chu   +3 more
wiley   +1 more source

A Frequency Selection Method For Hf-Oth Skywave Radar Systems

, 2006
Publication in the conference proceedings of EUSIPCO, Florence, Italy ...
Capria A, BERIZZI, FABRIZIO, Soleti R, DALLE MESE, ENZO   +3 more
openaire   +4 more sources

Time Synchronisation for Passive Bistatic HFSWR via Kalman‐Filtered Delay‐Locked Loop

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
This paper proposes a per‐chirp time synchronisation method, FLOS‐Kalman‐DLL, for passive bistatic high‐frequency surface wave radar (HFSWR) operating under the coexistence of clock drift and atmospheric impulsive noise. The method combines fractional lower‐order statistics with a Kalman‐filtered delay‐locked loop to achieve sub‐sample synchronisation ...
Yuan Lu, Jie Song, Wei Xiong, Yaqi Cui
wiley   +1 more source

Intelligent Systems for Beyond‐Line‐of‐Sight Defense Communication: Technologies, Case Studies, and Research Frontiers

International Journal of Intelligent Systems, Volume 2026, Issue 1, 2026.
Beyond‐line‐of‐sight (BLOS) communication is a fundamental component of modern defense strategies, enabling secure and reliable information exchange in environments where traditional line‐of‐sight (LOS) methodologies are ineffective due to obstructions or operational constraints.
Shumaila Javaid, Ruhul Amin Khalil, Muhammad Haris, Farman Ullah, Nasir Saeed, Kallol Mohanta   +5 more
wiley   +1 more source

Decoding Brain Tumors: Comprehensive Insights into Detection and Evaluation Approaches

Engineering Reports, Volume 7, Issue 12, December 2025.
Comparison of brain tumor analysis techniques reveals that hybrid and ensemble models offer superior accuracy and generalization, while traditional ML provides higher interpretability and lower computational cost. This radar chart highlights the trade‐offs across five critical performance dimensions.
Anusha Nalajala, Inturi Anitha Rani, Olutayo O Oyerinde, Avinash Yadav, Nishant Kumar   +4 more
wiley   +1 more source