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27 results on '"Cao, Xianqi"'

6. Simulation Research of Electrostatic Precipitator Power Supply Voltage Control System Based on Finite Element Differential Equation

Author

Cao Xianqi

Subjects
electrostatic precipitator, finite element differential equation, voltage control system, coupled inductance, 44a10, Mathematics, QA1-939
Abstract

An electrostatic precipitator is an essential piece of equipment to eliminate atmospheric dust pollution. Its power supply is of great significance to the working efficiency and reliability of the dust collector. This paper uses field-programmable gate array (FPGA) technology to design an electrostatic precipitator power controller. In this paper, a fuzzy control scheme with variable scale factors is adopted to make the highest average voltage between the two poles of the precipitator better approach the critical breakdown voltage. In this paper, the transfer function is derived based on the finite element differential equation and the method of three-dimensional drawing. In this way, the influence of parameters such as the coupling inductance of the pulse power supply, the coupling coefficient, and the parasitic resistance of the dust removal chamber on the load oscillation can be obtained. It is found that the control system can control the electrostatic precipitator power well. It can significantly improve dust removal efficiency.

Published
2023
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19. Synergistic Effects of Mechanical, Thermal, and Optical Properties of Polyimide Composite Films Reinforced with WO3 Nanorods.

Author

Niu, Yongan, Shi, Zenghui, Pei, Yingjin, Shi, Zihang, Cao, Xianqi, Feng, Jianming, and Zhang, Xin

Subjects
POLYIMIDE films, NANORODS, OPTICAL properties, ELECTRON donors, CYCLIC voltammetry, THERMAL properties
Abstract

In this study, WO3 nanorods are directly blended with polyamic acid (PAA) solutions to improve the electrochromic capacity of WO3/PAA composite films. Specifically, the hexagonal WO3 nanorods are prepared as inorganic reinforcements using a hydrothermal method and modified by γ‐aminopropyl triethoxysilane. After curing at 300 °C, the WO3 nanorods/polyimide (PI) composite films demonstrate excellent mechanical and thermal properties. The tensile strength of the 1 wt% WO3/PI composite film is ≈110.27 MPa. The thermal stability of the 5 wt% WO3/PI composite film is better than that of the others, and the T5 (5% thermal weight loss temperature) value is ≈560.05 °C. Moreover, the WO3/PAA composite films demonstrate electrochromic behaviors. The electrochromic range of the 5 wt% WO3/PAA composite film exceeds to 68%. For the WO3/PAA samples, the oxidation peak of the WO3 nanorods is evident in the cyclic voltammetry curves. The color contrast of WO3/PI nanocomposites can be enhanced owing to the significant synergistic effects of the electron donor–acceptor system. [ABSTRACT FROM AUTHOR]

Published
2022
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21. Theoretical And Experimental Research On High Efficiency Screw Chiller Used In Subway Station

Author

Liang Cai, Xiaosong Zhang, Yu Pengfei, Wen Xiantai, and Cao Xianqi

Subjects
Chiller, Engineering, Waste management, business.industry, 020209 energy, 02 engineering and technology, General Medicine, Energy consumption, Coefficient of performance, Automotive engineering, Air conditioning, Chilled water, 0202 electrical engineering, electronic engineering, information engineering, Water cooling, business, Evaporator, Efficient energy use
Abstract

As an important part of urban public transport, how to reduce energy consumption of rail transit becomes a focused issue. Considered with the operating characteristic of air conditioning in subway station, solution method with large temperature difference and high outlet temperature of 10/17 Celsius in evaporator is put forward. Two condensers and evaporators are linked in series and both of them are in countercurrent form, in which condition the energy efficiency can be improved greatly. Simultaneously high efficiency chiller with two different capacities of compressor heads is designed to improve the energy efficiency in part load. Experimental research of high efficiency chiller is conducted and the results show that: With the decrease of load percentage, COP (coefficient of performance) is fluctuated from 6.2 to 7.0. With the increase of outlet chilled water, COP increases greatly; while with the increase of outlet cooling water, COP decreases greatly. In this system at the design condition, COP can reach as high as 7.01, which can supply database for utilization of chiller in subway station air conditioning system.

Published
2017

23. Study on the structure and hydrogen storage characteristics of as-cast La0.7Mg0.3Ni3.2Co0.35−XCuX alloys

Author

Cao Xianqi, Huang Taizhong, Han Jitian, Xu Naixin, Sun Guo-xin, Yu Jiemei, Wu Zhu, and Zhang Yihe

Subjects
Materials science, Hydrogen, Renewable Energy, Sustainability and the Environment, technology, industry, and agriculture, Analytical chemistry, Energy Engineering and Power Technology, chemistry.chemical_element, Condensed Matter Physics, Electrochemistry, Plateau pressure, Crystallography, Hydrogen storage, Fuel Technology, chemistry, Phase (matter), Electrode
Abstract

In this paper, the structure, hydrogen storage performance, electrochemical discharge and cyclic characteristics of La 0.7 Mg 0.3 Ni 3.2 Co 0.35−X Cu X alloys were investigated using X-ray diffraction (XRD), pressure composition isotherm (PCT) and electrochemical tests. XRD tests showed that all of the alloys were composed of La 2 Ni 7 and LaNi phases. The ratio of LaNi phase in these alloys increased with increasing substitution of Cu for Co. PCT tests showed that increasing substitution of Cu for Co resulted in the decrease of hydrogen storage capacity and the increase of plateau pressure. Electrochemical discharge tests showed that the discharge capacity increased first and then decreased with increasing substitution of Cu for Co.

Published
2010

27. Direct ink writing of continuous SiO2fiber reinforced wave-transparent ceramics

Author

Zhao, Zhe, Zhou, Guoxiang, Yang, Zhihua, Cao, Xianqi, Jia, Dechang, and Zhou, Yu

Abstract

This article reports the first example of 3D printed continuous SiO2fiber reinforced wave-transparent ceramic composites via an adaptation of direct ink writing technology to improve the mechanical and dielectric properties of ceramics. The ceramic inks showed good printability by adding nano-SiO2powder. The effective continuous fiber-reinforced printing progress was achieved through the design and optimization of the coaxial needle structures by finite element simulation. After printing, the continuous fibers were evenly and continuously distributed in the matrix ceramics and the high molding precision for fiber reinforced composite was kept. It is demonstrated that 10 vol% continuous SiO2fiber improved the bending strength of ceramics by about 27% better than that of the ceramics without fiber and the dielectric performance has also been greatly improved. The novel method unravels the potential of direct ink writing of continuous fiber reinforced wave-transparent ceramics with complex structures and improved properties.

Published
2020
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