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28 results on '"Li, Xiao Yu"'

8. A Ka-Band Multilayer Beaming-Scanning Antenna Using Liquid Crystals.

Author

Li, Xiao Yu, Jiang, Di, Liu, Juan, and Tong, Mei Song

Abstract

This letter presents a Ka-band multilayer beaming-scanning antenna based on the electronically controlled liquid crystal (LC) phase shifter and proposes a new integrated and miniaturized LC antenna structure. The antenna is composed of four planar magnetoelectric dipole antenna units, four LC-based reflective phase shifters, and the power divider network, including the bias loading and dc blocking circuits. An external four-channel adjustable power module is designed with the field-programmable gate array (FPGA) to output the independent control and continuous adjustment bias voltage. It has overall dimensions of 35 mm $\times 50$ mm $\times 2.5$ mm, which operates at 35 GHz. Measured results demonstrate that by adjusting each phase of the LC-based phase shifter through the power module, the structural and functional LC array achieves the one-dimensional (1-D) scanning angle from $-22^\circ$ to $+23^\circ$ and the main lobe gain is 6.7 dBi. [ABSTRACT FROM AUTHOR]

Published
2022
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14. Design optimization parameter steering method applied in exploring an effective design space

Author

Fu Zhan-ping, Hu Wen-ting, Ou Hai-ying, and Li Xiao-yu

Subjects
Electric motor, Mathematical optimization, Computer science, law, Phase (waves), Value (computer science), Algorithm design, STRIPS, Design space, Space exploration, law.invention
Abstract

In order to get a design space in optimization modeling phase sooner and better, an effective design space ascertained algorithm based on design optimization parameter steering mechanism was proposed. In the algorithm a rough design space was assigned first. Then every design variable value was adjusted to a “green corridor” that satisfied system restrictions through parameter steering mechanism step by step. Finally all variables value ranges were gotten, and so an effective design space was ascertained. Applying the algorithm in a design optimization for some motor, it was found that its design space reduced greatly. Then optimization efficiency was improved by 34%. It is showed that the algorithm provides an intuitive, fast and high efficient means to get an effective design space.

Published
2010

27. Subsecond Response of Humidity Sensor Based on Graphene Oxide Quantum Dots.

Author

Li, Ning, Chen, Xiang-Dong, Chen, Xin-Peng, Ding, Xing, and Li, Xiao-Yu

Subjects
GRAPHENE oxide, QUANTUM dots, HUMIDITY, ADSORPTION (Chemistry), ANESTHESIA, CRITICAL care medicine
Abstract

Humidity sensors based on graphene oxide quantum dots (QDs-GO) with rapid response were developed. Results proved that these QD-GO-based sensors exhibit a subsecond response. The effect of film thickness on response time was discussed. The possible theory of intersection density was proposed to explain the rapid response behavior of QD-GO based humidity sensors. This letter demonstrated that QD-GO based sensors may have various applications, such as human breath monitoring. [ABSTRACT FROM AUTHOR]

Published
2015
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