Results 91 to 100 of about 20,719 (245)
Forecasting Irregularly Spaced UHF Financial Data: Realized Volatility vs UHF-GARCH Models [PDF]
A very promising literature has been recently devoted to the modeling of ultra-high-frequency (UHF) data. Our first aim is to develop an empirical application of Autoregressive Conditional Duration GARCH models and the realized volatility to forecast ...
Francois-Éric Racicot +2 more
core
Diagnóstico de descargas parciais em subestações isoladas a gás SF6 utilizando redes neurais artificiais [PDF]
, 2006 Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia ElétricaO presente trabalho de dissertação aborda o desenvolvimento de uma ferramenta computacional para o diagnóstico de ...
Paulo, Assis Rogério Gomes da Silva
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A compact meander flexible UHF tag for industrial applications
e-Prime: Advances in Electrical Engineering, Electronics and EnergyThe objective of this paper is to introduce a novel design for a flexible Ultra-High Frequency tag (UHF tag) through the utilization of the meander line technique (MLA) and loop antenna method.
Latifa El Ahmar +6 more
doaj +1 more source
The Turbulence Properties of 150‐km Echoes in the Lower Ionosphere
Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.Abstract The valley region ionosphere spans from approximately 120–200 km in altitude, and hosts a wide range of plasma, neutral, and solar interactions that create and maintain the ionosphere. In this region a ubiquitous and mysterious source of radar echoes called “150‐km echoes” has been observed since the 1960s.
William J. Longley +3 more
wiley +1 more source
IoT-Linked Integrated NFC and Dual Band UHF/2.45 GHz RFID Reader Antenna Scheme
IEEE Access, 2019 This research proposes a system board of integrated antenna scheme of near-field communication (NFC) and dual band ultra-high frequency (UHF, 920-925 MHz)/2.45 GHz radio frequency identification (RFID) reader antennas for Internet of Things (IoT ...
Adisak Romputtal +1 more
doaj +1 more source
Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain
Advanced Materials, Volume 38, Issue 32, 8 June 2026.A radiofrequency antenna platform comprising planar and bend configurations is developed, incorporating structurally integrated epsilon‐negative metamaterial unit cells to enhance MRI. These antennas enable high‐resolution in vivo human MRI of the eye, orbit, and occipital brain. Comprehensive validation, including simulations, phantom experiments, SAR,
Nandita Saha +14 more
wiley +1 more source
Application of UHF Sensors in Power System Equipment for Partial Discharge Detection: A Review
Sensors, 2019 Condition monitoring of an operating apparatus is essential for lifespan assessment and maintenance planning in a power system. Electrical insulation is a critical aspect to be monitored, since it is susceptible to failure under high electrical stress ...
Hua Chai, B.T. Phung, Steve Mitchell
doaj +1 more source
2D Materials Empowered Radar Absorbing Materials: A Review
Advanced Electronic Materials, Volume 12, Issue 12, 22 June 2026.Recent progress in 2D materials empowered radar absorbing materials (RAMs) is reviewed, highlighting four key structural design strategies that enhance electromagnetic wave absorption. Porous structures, heterogeneous interfaces, printed metamaterials, and tunable metasurfaces are compared in terms of their governing physics, fabrication complexity ...
Yujie Zhong +4 more
wiley +1 more source
MATEC Web of Conferences, 2018 Apparent discharge quantity is usually recognized as judgement standard for severity of partial discharge in the field of electrical equipment insulation diagnosis.
Yang Tao +10 more
doaj +1 more source
Variability of the UHF Signals Generated by Partial Discharges in Mineral Oil
Sensors, 2019 The paper presents the results of the analysis on the variability of the ultra-high frequency (UHF) signals generated by partial discharges (PD) under the long-term AC voltage.
Michal Kunicki
doaj +1 more source