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This paper reports a 3.0 THz detector which can detect the terahertz wave radiated by a quantum cascade laser (QCL) working at pulse mode. The detector was implemented in a 65 nm silicon CMOS process. The chip size is 1.5×l.5 mm2 including bonding pads. THz detector using FET is based on plasma wave theory proposed by Dyakonov and Shur which allows detection of THz radiations far beyond the FET devices...
Different spatial modes, LP01 and LP21, were successfully excited and amplified in a 0.5% Ho:YAG single crystal fiber (SCF) amplifier fabricated by the laser heated pedestal growth (LHPG) method at 2 μm.
The quasi-Z-source cascaded multilevel inverter is a new type of inverter topology that can achieve buck/boost and DC-AC conversion in single-stage system and output multi-level voltage. When it is applied to distributed grid-connected generation, a big output power difference between modules will lead to grid-connected current distortion and system instability. In this paper, the output power ratio...
The Quasi-Z-Source inverter (qZSI) applied to the photovoltaic (PV) system has nonlinear and unstable zero dynamic characteristics, which leads to the problem of narrow system bandwidth and slow dynamic response. A nonlinear control strategy is proposed based on the input-output feedback linearization method. The nonlinear affine model of qZSI is presented and transformed to a linearized and decoupled...
Coordination among workers within a collaborative team environment is a key factor to its success but it is challenging to come up with a general model for relative costs and benefits of coordination. In a typical work environment, teams with sufficient aggregate expertise are selected to work on an incoming sequence of tasks one by one; it is often the case that the cost of coordination among the...
A calibration method for vision sensor system is proposed, this method use checkerboard as the target which is folded out of an angle, and using several point pairs to obtain the optimal matrix, point pairs come from the world and the corresponding pixel image coordinate system, and then camera's all parameters can be obtained by factorizing this matrix. Calibration can be done using only one image...
LiFePO4 battery has been widely used in electric vehicles due to high safety and long cycle life. This paper firstly analyses the basic characteristics of LiFePO4 battery including the capacity and internal resistance. Secondly, particle filter (PF) algorithm is introduced to predict the remaining useful life (RUL) of LiFePO4 battery effectively. Based on the LiFePO4 battery life degradation data,...
This paper proposes an automatic spatially-aware concept discovery approach using weakly labeled image-text data from shopping websites. We first fine-tune GoogleNet by jointly modeling clothing images and their corresponding descriptions in a visual-semantic embedding space. Then, for each attribute (word), we generate its spatiallyaware representation by combining its semantic word vector representation...
Objective: This study aimed to explore and compare the effects of augmented reality (AR) and virtual reality (VR) on induced anxiety in set-up scenes for claustrophobia treatment and determine which device functions better. Methodology: Healthy individuals were selected as subjects. During the experiment, the AR and VR scenes were introduced in sequence. The social anxiety scale was assessed after...
This paper presents an improved indirect feedback instrumentation amplifier for reading ECG signals. The circuit uses a charge pump module and an integral feedback offset suppression module. The input common mode range (ICMR) is extended, and the electrode offset and baseline drift in the ECG signal are suppressed. The circuit is designed by using 0.18μm CMOS process. The simulation shows that the...
In order to improve the ability of harmonic reduction at DC link of multi-pulse rectifier (MPR), the harmonic reduction mechanism at DC link of two kinds of 24-pulse rectifiers with double-tapped interphase reactor (IPR) or auxiliary single-phase full-wave rectifier (ASFR) was investigated. According to the configuration and Ampere-Turn balance with double-tapped IPR and single full wave rectifier,...
In order to enhance the ability of harmonic suppression for multi-pulse converters (MPCs). This paper proposes a novel pulse multiplication method at DC side of MPCs. The presented rectifier consists of a three-phase bridge parallel structure 12-pulse rectifier and a novel double winding tapped inter-phase converter (TIPC). The functions and characteristics of delta-connected autotransformer and ZSBT...
A novel multi-wavelength switchable laser system is proposed and demonstrated, which is based on polarization hole burning (PHB) effect in an erbium-doped fiber (EDF) laser (EDFL). In this EDFL, multiple fiber Bragg gratings with different wavelengths are used as comb filter. The PHB effect is enhanced by polarization separating of the multi-wavelength lasing lines through adjusting the polarization...
To reduce data-storage costs and enhance high accuracy of industrial process fault detection, a data driven fault diagnosis method is proposed based on diffusion maps and hidden Markov model. Firstly, the correlation dimension of sample data is calculated. Secondly, the high-dimensional eigenvectors are extracted into low-dimensional manifold space by diffusion maps. Finally, the low-dimensional eigenvectors...
In the paper, aiming at the large-angle attitude maneuver problem of the spacecraft of which the inertia matrix is uncertain, we establish the spacecraft's error quaternion attitude tracking model, and we use the golden section adaptive control method combined with the logic differential control method, following the planning path, to complete the large-angle attitude maneuver control of the spacecraft...
In the field of advance scientific research where world is moving towards less human resources and more machine. Distributed representation has been one of the major field in which the prospects of neural usage have shifted immensely. In this research paper we have discussed how distributed representations are being used in streaming data clustering, and how to build a sequential evolution model for...
A novel method to realize two point fiber-optic ultrasonic sensor system has been demonstrated, which is based on fiber Bragg grating (FBG) in an erbium-doped fiber (EDF) ring laser (EFRL). There are two pairs of FBGs with different Bragg wavelength in this system. Each pair of FBGs has a long FBG (LFBG) and a short FBG (SFBG), which have an appropriate matching operating point and determine one potential...
An autonomous navigation method based on UV sensor (ultraviolet sensor, UV sensor) for high earth orbit (HEO) satellites is proposed by considering the problem of accuracy decrease caused by the constant deviation in UV sensor imaging plane. Firstly, the constant deviation is looked on as state variable of the navigation system to realize real-time estimate and compensation. Secondly, partial state...
This paper describes an experimental study of streamer inception and propagation characteristics from a protrusion in transformer oil under AC voltage. The information acquired by partial discharge detection, such as current pulse sequences, phase-resolved PD (PRPD) pattern and statistical parameters are obtained; moreover, optical properties of streamer in transformer oil are captured by fast-imaging...
To study the generation mechanism of fiber impurities in oil-pressboard insulation and their influences on partial discharge process under DC voltage, a HVDC experimental platform was set up, based on which characteristics including impurity shape, partial discharge inception voltage (PDIV), partial discharge repetition rate (n) and partial discharge apparent charges were all recorded and analyzed...
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