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This paper proposes a power decoupling solution based on improved single-phase Y-source inverter with no additional power semiconductors. Single-phase inverter would cause voltage and current ripples on the dc link because of double-frequency power ripple. Commonly, large electrolytic capacitors are connected to dc link in H- bridge inverter to accomplish power decoupling. However, electrolytic capacitors...
In this paper, the stability of a class of discrete-time nonlinear cascade switched systems is studied. The average dwell time method is used to design a state feedback controller, which makes the discrete nonlinear cascade switched systems with uncertainty and time-delay terms to achieve exponential stability under arbitrary switching strategy. Simulation results verify the effectiveness of the proposed...
We propose a new method to solve the point matching problem by l1 regularization. The non-rigid transformation function based on compact support radial basis functions (CSRBF) is represented by the linear system with respect to its coefficients. The transformation function is estimated by the proposed sparse optimization model with regularizing the CSRBF coefficients by l1 norm and the affine coefficients...
In landmark-based image registration, estimation of transformation based on radial basis functions (RBFs) expansions has been successfully utilized in many applications. A novel landmark-based image registration method regularized by l1 and l2 norm is proposed in this paper to estimate transformations based on corresponding landmarks. The compact supported radial basis functions (CSRBFs) are utilized...
Cryogenic operation of power electronics provides many promising benefits for power conversions compared to their ambient-temperature counterparts. This paper presents a cryogenic boost-buck chopper integrated with cryogenic MOSFETs and high temperature superconducting (HTS) inductor. The results obtained show that the proposed boost-buck chopper has much higher operational efficiency than the conventional...
From the electron motion equations and Maxwell equations, the coaxial gyrotron beam -wave coupling equations are derived and the coaxial gyrotron self-consistent theory of large-signal model is established. Using codes MATLAB, A set of codes is developed and the 170GHz, 1.7MW coaxial gyrotron beam- wave interaction is simulated. Based on self-consistent theory, the field profile, phase and efficiency...
Pedestrian detection based on the framelet features in noisy depth images is investigated in this paper. For capturing the local features and attenuating the effects of noise in depth images, a features optimization model is proposed to adaptively select the framelet features for classification. The selected framelet features extracted by the model and SVM with a linear kernel is adopted as the feature...
The problem of color image restoration is investigated in this paper. The framelet-based color regularization term is proposed to preserve the edges of restored images and attenuate the false color for human visual system. A fast iterative shrinkage algorithm is applied to tackle the proposed non-smooth restored model by thresholding the framelet coefficients. Numerical examples demonstrate that our...
Azimuthal asymmetry of magnetic field in magnetic injection guns (MIGs) is studied. The stability of MIGs in azimuthal symmetry situation is studied in many papers. But the azimuthal asymmetry in guns hasn't been discussed yet. This paper use CST software to create the 3D model of MIGs and simulate the condition that magnetic field axis transverse offset and azimuthal offset. The result shows the...
Summary form only given. The Gyrotron Backward-Wave Oscillator (Gyro-BWO) characterizing broadband continuous tuning is a high-power source of coherent millimeter wave radiation based basing on the electron cyclotron maser instability. This study proposes a Ku-band TE01 fundamental harmonic Gyro-BWO. First, it calculates the start oscillation frequency and length according to the linear theory of...
Gyro-traveling wave tube amplifier has become one of the most promising amplifiers in recent years for large power capacity of single-tube, wide frequency band. The biggest difficulty of design gyro-traveling wave tube is how to suppress various spurious oscillations modes competition. gyrotron backward wave oscillation, as one of the most important spurious oscillation, will greatly reduce the amplifier's...
A new approach for estimating evapotranspiration (ET) driven by MODIS satellite data is proposed based on the integration of the triangle method and MOD16 algorithm. To improve the ET estimation, several pre-processing methods, including destriping for MODIS albedo data, denoising for MODIS EVI data, and topographic correction for MODIS land surface temperature (Ts) data are applied, and several ways...
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