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We search for steady TeV γ-rays from 18 pulsars in the Fermi-LAT pulsar catalog using the Tibet air shower array. We observe 8 sources including the Crab against expected 0.41 sources at a significance of 2σ or more among the 18 pulsars. The chance probability from Poisson statistics is estimated to be 1.4×10-8.With the Crab excluded, it is estimated to be 1.8×10-7. These low chance probabilities...
A new parameter estimation algorithm based on Sub-band Dual Frequency Conjugate and LVT (SDFC-LVT) operation is proposed for fast moving targets. A new synthetic signal is constructed by the essential operations, including spectrum division, frequency shifting, and conjugate multiplications. After that, Keystone transform and LVT operator are performed on the constructed signal to attain the estimates...
SiGe HBT is a key device for BiCMOS process used for high-speed communication, automotive radar and defense military. For normal SiGe process, the control of emitter window undercut is often not easy. In this paper, we studied the influence of emitter undercut on HBT parameters, through both TCAD simulation and wafer results. While transistors with larger area-to-perimeter ratio are supposed to have...
Plasma flow control, based on plasma aerodynamic actuation (PAA), has become a newly-rising focus of international aerodynamic and thermodynamic fields. Nanosecond-pulse surface discharge is considered to be a new way of generating plasma aerodynamic actuation. When it comes to the practical application, the altitude at which plasma flow control is expected to be adopted is about 10–20km, where the...
Here we present a new microfabricated optical endoscope using a fully integrated optical waveguide with a push-pull piezoelectric actuator design. This new scanning probe was constructed using SU-8 epoxy-based photoresist as a resonant cantilever. The scanner was driven with a frequency of 25 Hz in the horizontal direction and a frequency of 4.71 kHz in the vertical direction. The best resolution...
Human detection and tracking are a vital part of mobile robot. In this paper, a method of improving performance of human detecting and tracking based on stereo vision is proposed. The proposed method is to get the human's disparity image by stereo camera, and then we can attain the human feature by image processing. Hu moment is chosen to detect human because it has the invariant character of translation,...
This paper proposes a new sensitive microwave non-contact vital sign detection system based on phase-coded pulse radar. In order to improve the accuracy of the detection, short time autocorrelation and Golay code is introduced in the new system to increase the SNR of physiological signals. Simulation results show that the dc offset and flick noise, which are dominant factors in the conventional continuous-wave...
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