Results 51 to 60 of about 114,262 (333)

Monitoring insulator contamination level under dry condition with a microwave reflectometer [PDF]

, 2015
—Build-up of surface contamination on high voltage insulators can lead to an increase in leakage current and partial discharge, which may eventually develop into flashover. Conventional contamination level monitoring systems based on leakage current,
Jiang, Yan, Judd, Martin, McMeekin, Scott, Nekahi, Azam, Reid, Alistair, Wilson, Alan   +5 more
core   +1 more source

Modified Rocard relation for complex permittivity

Physica A: Statistical Mechanics and its Applications, 1981
Abstract It is shown that to a high degree of accuracy the complex relativity permittivity for a gas dielectric or for a liquid dielectric in very dilute solution in a nonpolarsolvent is given theoretically for symmetric polar molecules by the modification of a relation, which essentially goes back to Rocard.
openaire   +2 more sources

Composites of Shellac and Silver Nanowires as Flexible, Biobased, and Corrosion‐Resistant Transparent Conductive Electrodes

Advanced Functional Materials, EarlyView.
Shellac, a centuries‐old natural resin, is reimagined as a green material for flexible electronics. When combined with silver nanowires, shellac films deliver transparency, conductivity, and stability against humidity. These results position shellac as a sustainable alternative to synthetic polymers for transparent conductors in next‐generation ...
Rahaf Nafez Hussein, Tiago Carneiro Gomes, Eliza Ng, Simon Rondeau‐Gagné, Tricia Breen Carmichael   +4 more
wiley   +1 more source

Broadband measurement of high permittivity at millimetre‐wave frequencies

Electronics Letters, 2016
In this Letter, a method for the broadband measurement of complex permittivity using a quasi‐optical technique is presented. After calibration of the quasi‐optical system, the material under test is inserted into the system and S‐parameters are measured ...
Y.‐P. Hong, M.J. Salter, D.‐J. Lee
doaj   +1 more source

Functional Materials for Environmental Energy Harvesting in Smart Agriculture via Triboelectric Nanogenerators

Advanced Functional Materials, EarlyView.
This review explores functional and responsive materials for triboelectric nanogenerators (TENGs) in sustainable smart agriculture. It examines how particulate contamination and dirt affect charge transfer and efficiency. Environmental challenges and strategies to enhance durability and responsiveness are outlined, including active functional layers ...
Rafael R. A. Silva, Giulio Fatti, Emanuel Carlos, Guilherme Ferreira, Sumita Goswami, Suman Nandy, Luiz H. C. Mattoso, Elvira Fortunato, Caio G. Otoni, Rodrigo Martins   +9 more
wiley   +1 more source

Determination of Soil Pore Water Salinity Using an FDR Sensor Working at Various Frequencies up to 500 MHz

Sensors, 2012
This paper presents the application of a frequency-domain reflectometry (FDR) sensor designed for soil salinity assessment of sandy mineral soils in a wide range of soil moisture and bulk electrical conductivity, through the determination of soil complex
Andrzej Wilczek, Grzegorz Janik, Viliam Pichler, Jolanta Cieśla, Wojciech Skierucha, Agnieszka Szypłowska   +5 more
doaj   +1 more source

Dielectric response of a polar fluid trapped in a spherical nanocavity

, 2006
We present extensive Molecular Dynamics simulation results for the structure, static and dynamical response of a droplet of 1000 soft spheres carrying extended dipoles and confined to spherical cavities of radii $R=2.5$, 3, and 4 nm embedded in a ...
Bagchi B., Debye P., Gradshteyn I. S., Hansen J. P., Jackson J. D., Jean-Pierre Hansen, Madden P. A., Ronald Blaak   +7 more
core   +1 more source

Optimizing the Drude-Lorentz model for material permittivity: Examples for semiconductors [PDF]

, 2017
Approximating the frequency dispersion of the permittivity of materials with simple analytical functions is of fundamental importance for understanding and modeling their optical properties. Quite generally, the permittivity can be treated in the complex
Langbein, Wolfgang, Muljarov, Egor A, Sehmi, Hame S   +2 more
core   +3 more sources

Electrically Tunable On‐Chip Topological Photonics with Integrated Carbon Nanotubes

Advanced Functional Materials, EarlyView.
This work demonstrates electrically tunable on‐chip topological THz devices by integrating 2D carbon nanotube (CNT) sheets with valley‐Hall photonic crystals, enabling broadband transmission modulation (71% modulation depth) and tunable narrowband filtering (0.54 GHz shift) through electrically induced thermal tuning. This advancement paves the way for
Jifan Yin, Wenhao Wang, Thomas Caiwei Tan, Abhishek Kumar, Ridong Jia, Nikhil Navaratna, Ranjan Singh, Lijuan Xie   +7 more
wiley   +1 more source

Polarization method for determination and visualization of complex permittivity in remote sensing issues

Научный вестник МГТУ ГА, 2019
When using remote radiophysical methods in problems of monitoring the environment, the central place belongs to solving problems of determining its electrophysical characteristics, i.e. dielectric permittivity e, conductivity c (complex permittivity ek).
L. Р. Ligthart, A. I. Kozlov, A. I. Logvin, I. V. Avtin   +3 more
doaj   +1 more source