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A novel passively mode-locked semiconductor edge-emitting laser is reported, based on an AlGaAs multi-quantum-well structure. Ultra short pulses are generated at 752 nm, with a 19.4-GHz repetition rate and a pulse duration of 3.5 ps.
A high resolution range profile (HRRP) method via compressed sensing (CS) with reweighted ℓ1 minimization is proposed. Since the weighted CS model has a better representation of the true sparse description than that of the general ℓ1 norm based CS model, the proposed compressive HRRP exhibits a remarkable suppression of the noise influence when dealing with a high background noise circumstance. To...
The objective of conventional wind power relay protections is to maintain the system's stable operation. However, the protections' selectivity is not high enough to enable the wind turbine to ride through low-voltage faults. Thus, with an increasing wind power capacity, it is required that the wind turbines possess more strict low-voltage ride-through(LVRT) ability, otherwise the stability of power...
Wind energy presents great potential for applications as a renewable source for power systems. However, it is an unsteady power source due to the randomness of the wind speed. If the power injection level of a grid-connected wind generator is high, it can lead to serious power quality problem. Hence it is important and necessary to find way to calculate and analyze the impact of wind power on system...
The sequence of manufacturing process should meet process constraints during the process planning optimization. The qualitative constraints are represented implicitly as geometry relationships, process rules and manufacturing environment, it is difficult to apply in the process optimization. A constraint matrix is established to express process constraints; transfer rules and regulation are also designed...
In this paper, the reduction of mutual coupling between two microstrip patch antennas is presented by implementing a novel parasitic structure. The measured results show that a 21 dB mutual coupling reduction was obtained in the bandwidth of 2.2% without affecting the radiation patterns obviously. This structure can be easily integrated into an adaptive antenna array to improve the null depth, or...
There are three models of Dielectric barrier discharge under atmospheric pressure, and a simple, effective diagnostic method to distinguish the discharge mode is urgently brought forward. Based on dielectric barrier electrodes, glow, pseudoglow homogeneous discharges under an 11.8 kHz voltage in helium at atmospheric pressure and filamentary discharges in air were investigated by measurements of discharge...
Glow discharge can be produced in dielectric barrier discharge (DBD) in helium containing impurities of the air at atmospheric pressure, which is usually interpreted qualitatively that "Penning ionization" lowers the gas discharge voltage, but it is the lack of experimental verification. This paper investigates the discharge in air and the effect of impurities of the air to helium DBDs at...
A novel time delay neural network is proposed for dynamical system control. In this work, A continuous recurrent neural network with time delay neurons in hidden layer is constructed, and the novel training algorithm and control law independent of delay are developed based on Lyapunovpsilas stability approach. Using the proposed method, the control error converges to a range near the zero point and...
An optical probe is developed for imaging in an optical coherence tomography (OCT) system. A 3D micro mirror is used for steering the beam from the source to the sample. A GRIN lens, fiber and micro mirror are assembled in a silicon optical bench. The assembled components are housed in the bio-compatible microinjection molded housing. The images obtained using this probe is studied with respect to...
Dielectric barrier discharge (DBD) tests were carried out in an air gap with flowing helium. Through photos taken from discharges between transparent water electrodes, influence of some test conditions on characteristics of DBD was invested. The conditions included amplitude and frequency of applied voltage, velocity of gas flow, distance of gas gap, and thickness of barriers. The results show that...
Dielectric barrier discharge (DBD) tests were carried out in an air gap with flowing N2. Characteristics of DBD were invested through photos taken from discharges between transparent water electrodes. The results show that when applied voltage amplitude, frequency increase, the filamentary discharge seems to transfer into a diffuse one by naked eyes. But the discharge current behaves more pulses not...
Purpose: From Nov. 2002 to May 2006, eight hundred and seventy-two patients with valvular insufficiency of lower extremity were treated by improved external valvuloplasty and venous laser photocoagulation. This study was to summarize our clinical experience. Methods: Data in 872 patients with primary deep venous valve insufficiency who were performed improved external valvuloplasty and intravenous...
Tensile-strained Ge photodetector is realized on Si-substrate using novel SiSiGe compliant layer with two-step Ge-process. Monolithic integration of p-i-n detectors with low dark current (0.4 nA), responsivity (190 mA/W) and high speed (5 GHz) on Ge-CMOS platform is demonstrated, with Ge pMOSFET showing 2X Si hole mobility.
In this work, we report our studies on the structures, transport, and magnetic properties in the rare earth element doped two dimensional layer structured perovskite compounds Sr2-xRExCoO4 (RE= rare earth element). Structure refinement has revealed that these compounds crystallize in the K2NiF4-type structure with space group I4/mmm. For Pr doped samples, the lattice parameter c decreases with Pr...
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