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An omni-directional cavity backed antenna is proposed this paper. The antenna is used for space aerocraft, so the cavity backed antenna is “buried” in the platform to ensure the good fluid mechanics characters. A simple monopole is used here for good omni-direction radiation and to enlarge the radiation in the low elevation angle, a conical cavity is used. A dielectric filled gap between the conical...
An L/S-Band antenna for a special aerocraft application is proposed in this paper. This antenna is composed with a microstrip antenna for L-band with circular polarization and unidirectional radiation and a biconical antenna for S-band with vertical polarization and omni-directional radiation. The microstrip antenna is placed above the biconical antenna and both of their feeding points are at the...
In industrial process, some important variables such as quality index, efficiency index and concentration of product components are difficult or even impossible to be measured directly due to the limitation of technology. This phenomenon leads to few labeled data and plenty of unlabeled data. Traditional identification method for controlled auto regressive (CAR) model usually cannot deal with unlabeled...
Pulsed thermography (PT) is a widely used non-destructive testing (NDT) technique for defect detection in carbon fiber reinforced polymers (CFRP) structures. Thermographic signal reconstruction (TSR) is often employed to process thermographic data due to its excellent performance in enhancing the contrast between defects and background. However, TSR does not reduce the noise of thermographic data...
This paper describes the design of a low profile and wideband antenna array with circular polarization. The antenna consists of 2 × 2 elements. Loop coupled structure and sequential rotation feeding technique are used to obtained wideband VSWR and axial ratio performances. The proposed antenna array is analyzed with HFSS software. The VSWR, Axial Ratio, and Radiation Patterns of the array are presented...
A miniature and wideband helix antenna with gradient radius is proposed in this paper. The contour of the antenna is as a cone with small bottom and large top radius. An extra microstrip line is connected to the bottom end of the helix for impedance matching. The antenna is modeled and simulated. The simulated results show that the antenna can cover the bandwidth of 40% in X-band. It's expected this...
We show a method of concentrating nanoscale samples in a film of aqueous suspension on a stationary substrate (not in vibration), which employs the acoustic streaming generated by an ultrasonically vibrating needle parallel to and above the stationary substrate. The acoustic streaming eddy on the substrate surface brings nano particles (NPs) to the center of the eddy. Concentrated SiO2 nano particles...
Rotary driving of a single micro/nano object is an important technology in assembling of micro/nano structures, handling of cells and other biological samples, micro/nano measurement etc. In 2013, our research group reported a method to rotate a single nanowire around a fiberglass in water. Based on the experiments, the rotary driving is caused by the acoustic streaming eddy around the micro manipulation...
The objective of this article is to present a precise calibration method-Poling Calibration Method (PCM) for 3D motion analysis. The main content covers basic principle, decision-making process, co-ordination arrangements, control point measurement, PCM algorithm and the creation of calibration space. A 10.00cm long rod with 2 reflective makers was used to test the calculation error after calibration...
By collecting the NIR spectroscopy of human finger end artery blood, the dynamic spectrum data can be obtained. Partial least square (PLS) regression was used to establish the calibration model of dynamic spectrum data and volunteers' biochemical analysis alcohol concentration values, and then the human blood alcohol concentration can be predicted. 104 finger end dynamic spectral data, obtained from...
To help overcome the difficulty of information overload, we conducted simulations to show the importance of information infrastructure in decision-making. Using simulations based on a NK-model, we show that it makes a difference in results whether decision-makers has a complete information infrastructure. Comparing results from two simulations with or without a complete information infrastructure,...
New applications such as real-time deep packet inspection require high-speed regular expression (regex) matcher, and the number of regexes in pattern store is increasing to several thousands, which requires a memory efficient solution. In this paper, a kind of hardware based compact DFA structure for multiple regexes matching called CPDFA is presented. According to statistics of regexes in Snort and...
A novel compression algorithm for fingerprint image is proposed. Wavelet-based Contourlet transform (WBCT), which is based on wavelet transform and directional filter banks (DFBs), can be capable of efficiently approximating natural images containing contours and oscillatory patterns. To reduce frequency scrambling, a new scheme based on maximally-flat filters which implements the DFBs is proposed...
In order to meet the demands of the development of freeway network, associating with the analysis of structure and function of the existing freeway management, the frame of freeway network management system is elementarily established based on state-of-the freeway network management abroad for all-circumstance operation. The system includes categories of freeway network information, analysis of influencing...
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