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Explosive charges are widely used in underwater acoustics experiments because it has wide bandwidth and high source level. the received signals are the shock wave and followed by a series of bubble pulses, which seriously affect the observation and applications of the signal. But for the shallow water waveguides, the bubble pulses could be seen as anther “signal”. In this paper, we treat the first...
The cam-type ATC manipulator has the advantages of fast tool changing and high efficiency, but the structure is complex and difficult to design. This paper proposed a new method of globoid cam 3D modeling for ATC manipulator-double-globoid cam mechanism, which could solve the design problem of the cam-type ATC device. Then, the multi-ridge dynamics model of the cam-type ATC manipulator was established;...
Label estimation is an important component in an unsupervised person re-identification (re-ID) system. This paper focuses on cross-camera label estimation, which can be subsequently used in feature learning to learn robust re-ID models. Specifically, we propose to construct a graph for samples in each camera, and then graph matching scheme is introduced for cross-camera labeling association. While...
Human action recognition has been a research topic due to challenges such as viewpoint variation and self-occlusion. Recently the cost-effective 3D sensor like Kinect makes it possible to combat these problems. In this paper, we propose a human action recognition method according to the similarity property of the joint motion, divide the human body into several clusters, and use feature extraction...
In this paper, we propose a novel two-way coherent TM01 mode combiner that combines the two-way TM01 mode to a one-way TM01 mode with high power capacity and combining efficiency. It is mainly composed of two two-way TM01 mode to TE10 mode power dividers, one four-way TE10 mode to TM01 mode power combiner and four H-plane bend rectangular waveguides. Simulation shows that, at center frequency 9.3...
In this paper, a 5-way multiplexer at X band for HPM combination is proposed. As the key part of the multiplexer, the filters based on cylindrical cavity are designed. The filters operate at TE11 mode and possess high transmission efficiency at pass band and reflection efficiency at stop band. The design of a 5 to 1 multiplexing manifold based on rectangular waveguide is given. An overall optimization...
FaceDCAPTCHA and FR-CAPTCHA, proposed in 2014, are both face-based CAPTCHAs relying on human face recognition. The security of FaceDCAPTCHA is based on the difficulty of classifying real human faces and fake faces while the FR-CAPTCHA finds two faces belonging to the same person in a complex background. In this paper, edge detection is employed to obtain the small faces in FaceDCAPTCHA and then an...
For atmospheric links, the free space optical communication is challenged by the effects of turbulence. Wave-front aberration and power scintillation of the signal light are the main factors which lead to the degradation of system performance. In this paper, the bit-error-rate performance of atmospheric coherent laser receiver with binary phase shift keying modulation is performed. Beside the turbulence...
ZnTe epitaxial film with thickness of 200цm was grown on the GaAs substrate by close-space sublimation (CSS). The surface topography of ZnTe film was analyzed by SEM, and the evolution of growth pit was observed, which revealed the mechanism of epitaxial growth. The structure was analyzed by X-ray radiation diffraction (XRD) 9–29 scan and rotary Ф-scan, and the results suggested that the ZnTe thick...
A high front-to-back ratio circularly polarized planar antenna is presented in this communication based on a quarter-mode substrate integrated waveguide sub-array. It is composed of three parts: an eighth-mode substrate integrated waveguide (EMSIW) sub-array, four coaxial cables which are used to connect the probe-fed sub-array and the corporate feed network, and the feed network of which composed...
Setting a proper number of antenna elements in arrays as a DDM unit, an artifice of DDM application for extremely big arrays is presented to balance the required RAM and calculating time for solving in each DDM unit and information exchange among different units. With this method, for array with hundreds of elements, both of the RAM and time consumed could be reduced, while the big arrays which are...
This paper presents the simulation results of a compact TM01-TE11 mode convertor and combiner. The combining efficiency and maximum electric field for different relative phases between the two input ports are given. Also, the high isolation degree when only one port is fed is demonstrated. The results show that the mode convertor and combiner at 9.3 GHz possess several gigawatts power capacity and...
This paper presents the design of a circular waveguide TM01 mode combiner with high power capacity for phased locked high power devices. Considering the characteristic of the TM01 mode, two high power sources are injected co-axially into a radial waveguide structure with rectangular coupling apertures symmetrically placed on the cylindrical profile of the circular waveguide. The microwaves generated...
In this paper, the effect of the gases absorbed on the surface of the RBWO high-frequency structure and the background gases inside the system on the pulse duration of high power microwave is analyzed. To simulate the plasmas originating from the ionized gases, a PIC model is studied. Simulation results show that the microwave power declines and the pulse-duration decreases with plasma filled in the...
This paper presents research result of short term wind turbulence impacts to gearbox dynamic response of wind turbines. Fatigue assessment method for non-zero non-Gaussian process is developed. A fluid dynamic model is built for wind speed and dynamic response model for wind turbine gearbox is constructed. Impacts of non-Gaussian loading to gear fatigue damage assessment of gearbox stress spectral...
Providing enhanced security is an important design objective of many future Internet architectures. In this paper, we propose a dynamic path identifier (D-PID) mechanism for a recently proposed future Internet architecture called CoLoR. The D-PID mechanism can efficiently enhance the security of the network by periodically changing the path identifiers (PIDs) between domains, which are used for inter-domain...
As a critical mechanical component of a wind turbine, gearbox failures mainly attribute to cumulative fatigue. Therefore, understanding and quantifying fatigue impacts to wind turbine operational life is important for its design optimization. According to ISO 6336, gearbox service life under variable load can be calculated and the damage due to cumulative fatigue can be quantified. While wind turbine...
A complex 3-stage gearbox design, in which one planetary gear set at first stage and two sets of parallel gears at second and third stage, is conventionally applied on the large wind turbine configuration with Doubly Fed Induction Generator. In this variable-speed wind turbine, it is hard to directly apply conventional frequency analysis on condition monitoring of the gearbox planetary stage. Proper...
This paper addresses a new person re-identification problem without the label information of persons under non-overlapping target cameras. Given the matched (positive) and unmatched (negative) image pairs from source domain cameras, as well as unmatched (negative) image pairs which can be easily generated from target domain cameras, we propose a Domain Transfer Ranked Support Vector Machines (DTRSVM)...
In this paper, we propose an effective algorithm for facial expression recognition (FER), which is based on completed local binary pattern (CLBP) and sparse representation. The new method solves sparse representations on both gray facial expression images and completed local binary pattern (CLBP) of these images. Afterwards, we obtain the both expression recognition results on both of expression features...
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