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Hematite has emerged as a good photocatalyst for efficient solar water splitting due to its favorable optical band gap (2.1–2.2 eV), extraordinary chemical stability in oxidative environment, abundance, and low cost. According to theoretical prediction, the solar-to-hydrogen efficiency of hematite can be 16.8% and the water splitting photocurrent can be 12.6 mA cm−2. However, the practical performance...
Electromagnetic characteristics are critical for performance evaluation of switched reluctance machine (SRM), but it's very difficult to get them due to strong nonlinearity and coupling. In this paper, the detailed magnetization and torque characteristics of SRM are obtained by finite element method (FEM) firstly, and then an analytic method (AM) is presented to calculate the characteristics. The...
We develop the temporal coupled mode theory for the ring-bus-ring device by taking account of the energy-conservation. The presence of the center waveguide in the tri-coupler section of the RBR facilitates the interaction between the two side-coupled rings. The correspondence between the coupled mode theory in time and transfer matrix formalism (TMF) is established. A very good agreement is obtained...
This paper presents a Space-Vector Modulated (SVM) Direct-Torque-Control (DTC) scheme for a direct-drive permanent magnet synchronous generator (PMSG) and a gird converter for wind energy without any position sensor. Direct control of the rotating velocity and amplitude of the stator flux vector allows very fast torque response of the PMSG according to the generator speed. Fixed switching frequency...
In this paper, we present the theoretical study of ring-bus-ring coupled into Mach-Zehnder interferometer (RBR-MZI) device, which is capable of generating transparent window analogy to the electromagnetically induced transparency (EIT) phenomenon in atomic system. The RBR is a new class of two-resonator system, where the inter-cavity interaction is facilitated by a tri-coupler, instead of conventional...
Dynamic mathematic model with thrust and normal forces in a single sided linear induction motor (SLIM) is established according to the flux distribution in the air gap, which is suitable to gap-length changing during operation of a SLIM. According to the operation characteristics of SLIM, its repulsive component and attractive component in the normal force are analyzed, and then a novel decoupling...
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