Results 81 to 90 of about 11,262 (263)
Effect of Co3O4 doping and sintering temperature on optical energy band gap properties in Zn-Bi-Ti-O varistor ceramics [PDF]
, 2017 It is necessary to investigate the electronic states of ceramic based ZnO vasristor and effect of doped impurities at different concentration. Band gap (Eg) of the ceramic (99-x) mol% ZnO+0.5 mol% Bi2O3+0.5 mol% TiO2+ xCo3O4 where x = 0, 0.2, 0.4, 0.6 ...
Mohd Ghazali, Mohd Sabri +5 more
core +1 more source
International Journal of Ceramic Engineering &Science, Volume 7, Issue 1, January 2025.Simulation methods were used to help reveal the effect mechanism of Y, Bi, and Co dopants on ZnO varistors. It provides an important theoretical basis for the development of high‐performance varistor. Abstract ZnO varistors doped with Y2O3${\rm Y}_2{\rm O}_3$, Bi2O3${\rm Bi}_2{\rm O}_3$, and Co2O3${\rm Co}_2{\rm O}_3$ were analyzed for electrical ...
Zhengzheng Fu +7 more
wiley +1 more source
High‐Current Cryogenic DC Solid‐State Circuit Breaker for Electric Aircraft
IET Electric Power Applications, Volume 19, Issue 1, January/December 2025.Cryogenic and superconducting technologies have great potential to significantly enhance the power density and efficiency of electric propulsion aircraft. This paper presents the design of a 300 V/1700 A DC solid‐state circuit breaker (SSCB) operating at cryogenic temperatures.
Zhongying Wang +8 more
wiley +1 more source
Nonohmic behavior of SnO2.MnO2-based ceramics
Materials Research, 2003 The present paper describes the nonohmic behavior of the SnO2.MnO-based system and analyzes the influence of the sintering time and the Nb2O5 concentration on this system's electrical properties.
Marcelo O. Orlandi +3 more
doaj +1 more source
Photothermal and Electrical Characterization of Zno-Based Varistor Systems [PDF]
, 2007 Photopyroelectric spectroscopy is a powerful tool for examining the optical properties related to non-radiative de-excitation processes in materials. This technique consists of using a thin photopyroelectric (PPE) film in intimate contact with a solid ...
Rizwan, Zahid
core
Cryogenic DC Circuit Breaker Based on High‐Power Press‐Pack IGBT
IET Electric Power Applications, Volume 19, Issue 1, January/December 2025.This paper presents the performance of cryogenically compatible 3.3 kV/1.5 kA PP‐IGBTs as the main circuit breaker in a hybrid circuit breaker. The 3.3 kV/1.5 kA press‐pack IGBT can interrupt currents exceeding 5.1 kA when immersed in a liquid nitrogen bath. PP‐IGBTs are promising candidates for high‐power circuit breakers in cryogenically cooled power
Zhongying Wang +9 more
wiley +1 more source
Ageing Behaviours and Mechanisms of SiC MOSFET and Si IGBT in DC Solid‐State Circuit Breaker
IET Electric Power Applications, Volume 19, Issue 1, January/December 2025.We propose that this distributed thermal profile in IGBT mitigates localised stress. Conversely, the high concentration of thermal stress in SiC MOSFET's gate region leads to its severe ageing. ABSTRACT The rapid development of DC power systems in applications such as electric aircraft and microgrids has highlighted the need for high‐performance DC ...
Jiajia Song, Bo Zhang, Yanfeng Song
wiley +1 more source
Diffusion of the 65Zn radiotracer in ZnO polycrystalline ceramics
Materials Research, 2003 Zinc self-diffusion coefficients were measured in polycrystalline ZnO of high density (>99% of the theoretical density) and of high purity (> 99.999%).
Maria Auxiliadora das Neves Nogueira +2 more
doaj +1 more source
European Journal of Applied Mathematics, 2016 A three-dimensional model of the varistor device is proposed. The thermal and electric conductivity of the material are taken to depend, in addition to the electric potential, on the temperature. Two theorems of existence and uniqueness of solutions for the boundary-value problem which determine the potential and the temperature inside the device are ...
openaire +1 more source
Polarity engineering in polycrystalline ZnO by inversion boundaries [PDF]
, 2014 Two distinctive polarity-engineered microstructures were obtained in polycrystalline ZnO ceramics by inducing two different types of inversion boundaries (IBs) inside individual grains to examine the effect of the different polarities on the varistor ...
Jeon, Sang-Yun +6 more
core +1 more source