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The small-cell base station requires a high linearity, high reliable and high efficiency power amplifier to enhance signal strength in a coverage region. To meet the demand, the 2.6 GHz two-way symmetrical Doherty power amplifier module which uses modularized components, enhances system stability and integrates with heat sink is proposed. The experimental results show that the proposed module delivers...
We report generation of terahertz repetition rate pulse directly from Erbium-Ytterbium co-doped fiber based on the combination effect of amplification and nonlinear phase locking. The repetition rate is up to 2.75 terahertz and the pulse width is 100 femtosecond.
We develop a dispersion engineering technique based on tailoring the width of waveguide. It achieves anomalous dispersion with a range of 70 nm numerically and alters the dispersion from −820±30 ps/nm/km to −140±40 ps/nm/km experimentally.
In this paper, we investigate the sampled-data control problem for polynomial sampled-data fuzzy system with time-varying delay. Based on sampled-data technique, a fuzzy controller is designed to guarantee the stability of closed-loop polynomial fuzzy system. By examining the stabilization problem, the Lyapunov-Krasovskii functional (LKF) is adopted and a delay-dependent stabilization condition is...
WiGig enables wireless multi-gigabit communication over 60GHz band. However, its usage scenarios may be constrained by two major limitations: line-of-sight propagation and very short transmission range. We seek to boost the WiGig's usability by using WiFi to complement its limitations in tri-band (2.4/5/60GHz) wireless systems. Our goal is to let a tri-band client have multimedia services at the WiGig's...
A Poisson-Gaussian (PG) denoising method for inservice insulator image is proposed. The existing spatial-based method can avoid the preserve more detail information than the transform-based method. Various transforms have been used for image denoising. However, the transforms have disadvantages such as aliasing and lack of directional selectivity. Meanwhile, the conventional redundant transform-based...
This paper studies the analysis and implementation of intelligent information processing and fault diagnosis technology for distribution automation system. In the fault diagnosis is mainly considering the influence of uncertain information and coupling information, processing technology and multi-source information fusion of multi-source information mining depth based on data driven, and switch level,...
Considering the elasticity of aircraft in gust, the L1 adaptive control can respond quickly while keeping up robust performance against elastic deformation. This paper presents a designed method of gust alleviation controller based on L1 adaptive output feedback. The pitching angle rate and the normal acceleration at the center of gravity are used as the feedback signals. The flap and the elevator...
In this paper, a review of microwatt low-noise amplifier (LNA) is presented. To achieve gain improvement and noise figure reduction simultaneously, a gain-boosting technique using transformer feedback is adopted in this LNA design. By employing current-reused, and forward-body-bias techniques, LNA can operate at a reduced supply voltage with micro-watt dc power consumption while maintaining good gain...
Predicting the High Intensity Radiated Field (HIRF) coupling in complex system is highly required in the aeronautic industry, which can be performed by electromagnetic simulation. But the validation of electromagnetic simulation is a difficult issue which needs proper flowchart and validation methods. In this paper, the numerical simulation by the parallel Finite-Difference Time-Domain (FDTD) method...
This article presents a novel internal pattern-switchable high-gain antenna array design for satellite mobile phone applications. By designing two sets of two-element 1.0 wavelength folded loop antenna array at top and side edge of a handset ground respectively, four different directional and steerable fan-shape radiating beams can be formed successfully to cover the 360 degree parallel with and surrounding...
Tail bits in the RESET process influence the distribution of resistive parameters, and will dramatically decrease the uniformity in high electric stimuli region. In this study, such phenomena can be explained as non-uniform distribution of defects in the insulating layer and high defects density in the bottleneck region of conductive filament (CF). Then departing from defects' distribution function,...
Resistive Random Access Memory (RRAM) can be regarded as a promising candidate on the manipulation of both electrical and magnetic properties. There is a widespread concern about the electrical manipulation of magnetic properties in RRAM devices. In our work, Co/HfO2/Pt RRAM device with magnetic conductive filament (CF) is designed and fabricated. Then the anisotropic magnetoresistance (AMR) effect...
This paper considers a robust control strategy for main steam temperature system of thermal power plant that is affected by immeasurable bounded disturbances. An output-feedback min-max optimization approach is proposed to obtain a controller which could effectively reject disturbances and stabilize the system. This approach combines moving horizon estimation with model predictive control and is formulated...
Breast cancer is a major public health issue and currently the second leading cause of cancer death in women. Early detection on whether a tumor is benign or malignant is crucial to a patient's treatment and their odds of survival. There are already existing methods in place to detect breast cancer based on physical characteristics of tumors as well as identifying novel biomarker genes. However the...
A single frequency erbium-doped fiber laser with an on-chip high-Q silicon nitride (Si3N4) microring cavity is demonstrated. The laser linear cavity is composed of a microring with a Q of up to 2.5×105 and a free spectral range (FSR) of 2 nm, a 12 cm erbium-doped fiber and a fiber Bragg grating (FBG). The linewidth of 8 kHz is achieved.
The purpose of this study was to investigate how Vietnamese female workers from various industries perceived gender discrimination and how they reacted against gender discrimination misconducts at workplace. A survey questionnaire was designed and distributed to 450 respondents. Structural Equation Modeling (SEM) was employed as statistical methods to analyze the relationships and mediating effect...
The increasing scale and capacity of power grid will lead to the increase of short-circuit current (SCC) level of the buses, which poses threats to the safe and stable operation of power grid. This paper proposes a dynamic partitioning technology for dynamically adjusting power grid partition structure by means of line-switching and load-transferring aiming at the problem of excessive SCC of buses...
This work presents a novel photovoltaic (PV) system with an intelligent maximum power point tracking (MPPT) controller. This Intelligent PV system consists of a solar model, flyback converter, digital signal processor, and DC electronic load. The MPPT controller based on the interval type-2 fuzzy logic control (type-2 FLC) can achieve fast tracking of the maximum power point and prevents interference...
A fully integrated photonic-assisted tunable RF transceiver based on SOI technology has been proposed and experimentally demonstrated, which contains the signal processing units of the up/down-conversion, phase shifting and filtering as well as the frequency multiplier of the local oscillator.
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