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The electric field modulated electronic properties are investigated in InAs/GaSb based type II and broken-gap quantum wells. The transfer matrix method is employed to solve the Schrcidinger equation in the present of the external electric field. The wavefunctions and subband energies for electron and hole can be tuned by the external electric field. The exchange self-energy induced by Coulomb interaction...
User interests model is a central issue for information recommender systems. Basically, a user interests model aims to describe a user's interests precisely in order to improve the quality of information access. However there are three challenges for developing a user interests model, i.e. initial user information acquisition, user profile representation and description of user interests evolution...
We bring out a runway extraction method based on rotating projection in this paper, which is consisted of three steps, locating the Region of interest (ROI), edge extraction and line detection. Firstly we employed template matching to locate the ROI which contains the runway area. Then we use Sobel operator to extract edges. The rotating projection algorithm is proposed to seek the potential straights...
Nowadays, induction heating (IH) technology; plays an important role in metal process due to its advantages such as efficiency, cleanness and safety. Among lots of IH solutions, rotary permanent magnet induction heater is proved to be a suitable one, especially for the nonmagnetic metal. Since the energy transfer efficiency improvement highly relies on the dimensional design of permanent magnet (PM)...
Virtual synchronous generator (VSG) in single-phase to interface distributed renewable energy is investigated in this paper. Mathematical models and numerical analysis are utilized to illustrate the features of the VSG. Enhanced control strategy is presented to ensure the performance of the VSG. Besides, a second order generalized integer (SOGI) is employed to calculate the instantaneous output power...
In this paper, virtual synchronous generator (VSG) theory is investigated and utilized to control parallel inverters in a micro-grid, which is capable of sharing the local loads without communication lines. The mathematical model of VSG is built to describe the electromagnetic and mechanical characteristics of a synchronous generator. To make the model suitable for parallel inverters application,...
Washing machines are typical systems with electromechanical coupling vibration. A novel approach is presented for modeling of an inclined drum washing machine system in this paper. Its Lagrangian function and Rayleigh dissipation function are obtained firstly. Then, its detail electromechanical coupling model is established based on Euler-Lagrange theory and variational principles. Notation that the...
It is difficult to obtain a more precise mathematical model of parallel-inverter system with a nonlinear load. Nonlinear load is the general factor which affects output voltage total harmonic distortion (THD) and current sharing. But fuzzy controller can control well without a precise mathematical model. Master-slave control is used to control the parallel-inverter system in this paper. The voltage...
A new SVPWM method used to control a six-phase dual stator induction motor is presented in this paper. By using decomposition technique, 12 vectors which have maximum magnitude are used to form a 12-side polygon and 12 sectors. The voltage reference vector is synthesized by two vectors with maximum magnitude, in which one vector is the sector's side and the other is the adjacent sector's side. This...
One time radial vibration, mostly caused by rotary eccentric load, may reduce the reliability and operating life of motors. In order to mitigate the one time radial vibration in permanent magnet motors, a real time detection method for rotary eccentric load based on the theoretical analysis of the motor vibration and the mechanical analysis was given, and a novel control strategy based on FOC (field...
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