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Preparation and Performance Study of Composite Aramid Paper for High-Frequency Working Conditions.
Nanomaterials (Basel)
November 2024
School of Electrical Engineering and Information Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
When the power converter connects to the high-frequency transformer breaks through the bottleneck and reaches a frequency of 100 kHz or even higher, the high-frequency transformer's inter-turn insulation faces more serious high-frequency discharge and high-temperature problems. In order to improve the service performance of oil-immersed high-frequency transformer insulation paper, composite K-BNNS particles are prepared by ultrasonic stripping, heat treatment, and thermomagnetic stirring. Then, K-BNNS particles are mixed with PMIA (polymeric m-phenylenediamine solution) slurry to produce composite aramid paper.
View Article and Find Full Text PDFHolistic numerical simulation of a quenching process on a real-size multifilamentary superconducting coil.
Nat Commun
December 2024
Q-MAT | Experimental Physics of Nanostructured Materials (EPNM), Department of Physics, University of Liege (ULiege), B5a, 4000, Liège, Belgium.
Superconductors play a crucial role in the advancement of high-field electromagnets. Unfortunately, their performance can be compromised by thermomagnetic instabilities, wherein the interplay of rapid magnetic and slow heat diffusion can result in catastrophic flux jumps, eventually leading to irreversible damage. This issue has long plagued high-J NbSn wires at the core of high-field magnets.
View Article and Find Full Text PDFValidation of galvanomagnetic and thermomagnetic transport measurements using Standard Reference Material 3451.
Rev Sci Instrum
November 2024
Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, Ohio 45221, USA.
In the "method of four coefficients," electrical resistivity (ρ), Seebeck coefficient (S), Hall coefficient (RH), and Nernst coefficient (Q) of a material are measured and typically fit or modeled with theoretical expressions based on Boltzmann transport theory to glean experimental insights into features of electronic structure and/or charge carrier scattering mechanisms in materials. Although well-defined and readily available reference materials exist for validating measurements of ρ and S, none currently exists for RH or Q. We show that measurements of all four transport coefficients-ρ, S, RH, and Q-can be validated using a single reference sample, namely, the low-temperature Seebeck coefficient Standard Reference Material® (SRM) 3451 (composition Bi2Te3+x) available from the National Institute for Standards and Technology (NIST) without the need for inter-laboratory sample exchange.
View Article and Find Full Text PDFThermomagnetic Anomalies by Magnonic Criticality in Ultracold Atomic Transport.
Phys Rev Lett
October 2024
University of Chinese Academy of Sciences, Kavli Institute for Theoretical Sciences, Beijing 100190, China.
We investigate thermomagnetic transport in an ultracold atomic system with two ferromagnets linked via a magnetic quantum point contact. Using the nonequilibrium Green's function approach, we show a divergence in spin conductance and a slowing down of spin relaxation that manifest in the weak effective-Zeeman-field limit. These anomalous spin dynamics result from the magnonic critical point at which magnons become gapless due to spontaneous magnetization.
View Article and Find Full Text PDFMagneto-transport and Thermal properties of TiH diatomic molecule under the influence of magnetic and Aharonov-Bohm (AB) fields.
Sci Rep
September 2022
Theoretical Physics Group, Department of Physics, University of Port Harcourt, PMB 5323 Choba, Rivers State, Nigeria.
In this study, the effects of Aharonov-Bohm (AB) and magnetic fields on the thermodynamic and magneto-transport properties of TiH diatomic molecule using the Deng-Fan potential as a model are investigated. The functional analysis approach (FAA) is used to solve the Schrodinger equation in the presence of magnetic and AB fields with Deng-Fan potential. The energy equation, as well as the wave function, have been derived.
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