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23 results on '"Zeng, Hao"'

3. Research on Electrical Conductivity and Mechanical Properties of Ecological Concrete Prepared from Mine Solid Waste.

Author

Ren, Zhenhua, Peng, Yifeng, Chen, Xi, Zeng, Hao, and Zeng, Xiantao

Subjects
ELECTRIC conductivity, MINE waste, SOLID waste, NICKEL sulfate, NICKEL ores, CONSTRUCTION materials
Abstract

Conductive concrete with nanographite–cupric nickel sulfate ore was prepared in this paper. As a new type of multifunctional multiphase conductive building material with conductive, electrothermal, electromagnetic shielding, piezoresistive properties, etc., nanographite–cupric nickel sulfate ore conductive concrete will have a wide range of applications in snow melting, electromagnetic shielding, cathodic protection and structural health monitoring, and other fields. In this paper, different dosage of nanographite and cupric nickel sulfate ore admixture that the mixture was excited by alkali excitation, ultrasonic vibration and combined alkali excitation and ultrasonic vibration, respectively were used to study the electrical conductivity and mechanical properties of conductive concrete, 36 groups of nanographite–cupric nickel sulfate ore conductive concrete specimens and seven groups of comparative specimens were cured for 28 days, and the unconfined compression test, three-point bending test, and electrical conductivity test were carried out. The results show that the electrical conductivity and mechanical properties of the specimens with 6% nanographite and 60% cupric nickel sulfate ore were the best, with the compressive strength, flexural strength and resistance reaching 40.83 MPa, 6.81 MPa, and 5,850 Ω·cm, respectively. Compared with the comparative specimens, the compressive strength and the flexural strength of the specimens are increased by 38.5% and 20.4%, respectively, and the resistivity is decreased by 55.7%. This shows that the alkali excitation-ultrasonic vibration activation method can not only improve the electrical conductivity of nanographite–cupric nickel sulfate ore conductive concrete pavement but also ensure the stability of its mechanical properties. [ABSTRACT FROM AUTHOR]

Published
2023
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13. Model-Switched Beamformer with Large Dynamic Range

Author

Zeng Hao, Xing Qian, Yang Qingkun, and Feng Linfeng

Subjects
Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Cellular telephone services industry. Wireless telephone industry, HE9713-9715
Abstract

The strong desired signal will be mitigated due to “self-nulling” for the adaptive beamformer, even if the array calibration is used. The proposed methodology switches the models between phased array and adaptive array. In general, the system utilizes Frost adaptive beamforming. However, it will be switched to phased array if the “self-nulling” appears. According to the estimation of the array pattern at the direction of desired signal, we can determine if the “self-nulling” happens. The new approach is much easier to implement compared with the various robust beamforming algorithms.

Published
2014
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14. Broadband Frost Adaptive Array Antenna with a Farrow Delay Filter

Author

Ji Lixia, Wang Qiushi, Zhao Yunxiao, Dong Tao, and Zeng Hao

Subjects
Beamforming, Article Subject, Computer science, 020206 networking & telecommunications, 02 engineering and technology, lcsh:HE9713-9715, Filter (video), Broadband, Frost, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, lcsh:Cellular telephone services industry. Wireless telephone industry, Weight, lcsh:Electrical engineering. Electronics. Nuclear engineering, Electrical and Electronic Engineering, Antenna (radio), Field-programmable gate array, lcsh:TK1-9971
Abstract

In a broadband adaptive array antenna with a space-time filter, a delay filter is required before digital beamforming when the Frost algorithm is used to obtain the weight vector. In this paper, we propose a Farrow structure instead of a direct form FIR structure to implement the time delay filter since it can satisfy the demand for real-time update and is very suited for the FPGA platform. Furthermore, a new off-line algorithm to calculate the Farrow filter coefficient is presented if the filter coefficient is symmetric. Finally, simulations are presented to illustrate that the design methodology for the Farrow filter is correct. The simulations also prove that the Frost broadband adaptive antenna effectively mitigates the interferences with a Farrow filter.

Published
2018

22. Model-Switched Beamformer with Large Dynamic Range

Author

Yang Qingkun, Feng Linfeng, Xing Qian, and Zeng Hao

Subjects
Beamforming, Engineering, Article Subject, business.industry, Phased array, Large dynamic range, Beamforming algorithm, lcsh:HE9713-9715, Signal, Control theory, Electronic engineering, Calibration, lcsh:Cellular telephone services industry. Wireless telephone industry, lcsh:Electrical engineering. Electronics. Nuclear engineering, Electrical and Electronic Engineering, business, Adaptive beamformer, lcsh:TK1-9971
Abstract

The strong desired signal will be mitigated due to “self-nulling” for the adaptive beamformer, even if the array calibration is used. The proposed methodology switches the models between phased array and adaptive array. In general, the system utilizes Frost adaptive beamforming. However, it will be switched to phased array if the “self-nulling” appears. According to the estimation of the array pattern at the direction of desired signal, we can determine if the “self-nulling” happens. The new approach is much easier to implement compared with the various robust beamforming algorithms.

Published
2014

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