Chao Liu

National Engineering Research Center of Electromagnetic Radiation Control Materials

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Huaning Wu

Naval University of Engineering

Xu Xie

Naval University of Engineering

Bin Li

China Electronics Technology Group Corporation

Hengfeng Wang

Naval University of Engineering

Shi R X

Yinghui Dong

Suzhou University of Science and Technology

Hua Ning Wu

Naval University of Engineering

Shuna Jiang

Inner Mongolia Electric Power (China)

Ning Ding

Soochow University

Ya-Long Yan

Naval University of Engineering

Cooperative Institutions

Naval University of Engineering

Chinese Academy of Sciences

Xidian University

University of Electronic Science and Technology of China

Tsinghua University

Huazhong University of Science and Technology

Shanghai Jiao Tong University

University of Chinese Academy of Sciences

Wuhan University

Jilin University

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Development and validation of work-related collaboration among Doctors and Nurses Scale (WCDNS) in Chinese general and specialist public hospitals

JM Johnston Ruju Xu F Li D Li Chao Liu

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A Multiconductor Reduction 3D Full-Wave Method for High Frequency Crosstalk Problem and Its Validation

Diangong Jishu Xuebao (2012)

Gang Zhang Lixin Wang Chao Liu

Crosstalk

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Design of an 3-Element Arc Array of Microstrip Antenna for Widen Bandwidth and Adjusting Beam Direction

Ying Kang Chao Liu Yan-shi Li Huaning Wu Hengfeng Wang

In the detector design of RFID, radio frequency identification devices, the antenna beam needs to meet the conditions of high gain and adjustable direction to cover the room and corridor in indoor environment,. In this paper, an 3-element arc array of microstrip antenna based on circularly polarized microstrip patch antenna are studied by quasi-Newton method in HFSS(high-frequency structure simulator). In this array, three probe-fed circularly polarized microstrip patch antenna, whose working frequency is 915Mhz, is placed on an arc array and the two array elements on both sides are symmetric. It is investigated that gain and bandwidth of the antenna array can be enhanced and the beam direction can be adjusted by properly arranging these array elements. The driven patch is a perturbed square one with two diagonal corners truncated in order to realize circular polarization. The model of antenna array has a gain of 5.9dB with a 3dB axial ratio bandwidth of 23.8%. The proposed antennas have been made and measured. The experimental results are basically the same as the simulation results. The research results provide a new idea for the design of microstrip antenna array, which can obtain higher gain while adjusting the beam direction of the antenna array.

Patch antenna

Antenna gain

10.1109/compcomm.2018.8780997

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A generalized coupling model for Capacitive Power Transfer systems

Chao Liu Aiguo Patrick Hu Mickel Budhia

Capacitive Power Transfer (CPT) technology has been proposed and investigated recently as an alternative contactless power transfer method which has the advantages of being able to transfer power across metal barriers and causing low power losses in metal surrounding circumstances. However, more fundamental researches are needed to guide CPT coupling analysis and design. Based on the Duality Principle, this paper proposes a generalized coupling model to describe the electric field coupling between the primary and secondary side of CPT systems. The concept of mutual capacitance is extended in a CPT system to decouple the primary and secondary circuits. A new term capacitive coupling factor is introduced to provide a direct comparison for different coupling design. The coupling model for multiple pickups is also developed. A CPT prototype has been built and the experimental results have shown that the new model can be used to improve the circuit tuning for significant output power increase.

Capacitive coupling

Direct coupling

10.1109/iecon.2010.5675014

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EFFECTS OF HEAT TREATMENT AND DOPING ON GRAIN DOMAIN SIZE AND MICRO-STRAIN IN MgB_2

Chao Liu

The effects of heat treatment temperatures and doping elements (Ti, Zr) on grain domain size and micro-strain in powder MgB-2 have been investigated by using X-ray and SEM. The results show that the grain domain size increases obviously, but the micro-strain decreases lightly with increasing heat treatment temperatures in both doped and non-doped samples. The grain domain size in doped samples is less than those of non-doped samples at the same heat treatment temperatures. The measured grain domain size by X-ray is consistent with the observed results by SEM. The increasing critical current density J-c in the (Ti, Zr) doped MgB-2 samples may be attributed to increasing micro-strain, decreasing domain size, increasing grain boundaries and increasing pinning force.

Strain (injury)

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Outline Data of the Khanka Lake

Journal of Global Change Data & Discovery (2017)

L J Chen Chao Liu Shi R X

10.3974/geodp.2017.03.20

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THE THEORY AND MEASUREMENT OF AN ELECTROMAGNETIC IMPULSE SOUND-SOURCE

Acta Acustica (1966)

Chao Liu

The electromagnetic impulse sound-source is a novel device which is capable of radiating high-power wide-band sound pulse with good repetition. In this paper, the functional principle of this device is first analysed from the viewpoint of circuits, and working formulas are obtained for designing such device. The circuitry and construction of a 1000-joule sound-source system are described. The measured results of the sound-source are given, which are in agreement with the theoretical results.

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A GRATICULE FOR THE MACROSEISMIC DETERMINATION OF THE DEPTH OF FOCUS OF AN EARTHQUAKE

Chao Liu

Starting from the frequently adopted formula h=△_i/(10~((I_0-I_i)/S)—1)~(1、2),where h is the focal depth, Ai is the mean radius of the ith isoseismal, I_0 is the epicentral intensity and s is a parameter and taking the common logarithm, we have log h=log△_i—1/2log (10~(I_0-I_i)/S)—1),A graticule can be constructed on the basis of this formula with s as a variable parameter. By use of this graticule, the values of s and h for 19 Chinese earthquakes were determined and it was found that the s-values for Eastern China are lower than those for Western China. According to the material for 61 earthquakes, it was found that the value of s increases with the focal depth; however, its relation with the low-velocity layer is not evident.

Intensity

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Study on Temperature Rise of Dry-Type Transformer in Different Cooling Conditions with FEM

TELKOMNIKA Indonesian Journal of Electrical Engineering (2014)

Chao Liu

To study the temperature rise of dry-type transformer in different cooling conditions, finite element method is used in this paper to calculate temperature distribution in the transformer. Firstly, thermal-fluid coupled model of a transfomer is built up，and the equivalent heat generation of this model is figured out according to the results of delivery test. Then, thermal-fluid coupled model is simulated in both natural cooling condition and forced cooling condition, and temperature distributions in the iron and windings under these two conditions are obtained. Finally, temperature rises in these two conditions are compared to figure out the influence of cooling condition on transformer temperature rise.

10.11591/telkomnika.v12i11.6659

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Study of laying technology of flexible intensified layer with graded macadam

Highways & Transportation in Inner Mongolia (2008)

Chao Liu

Based on the practice of flexible intensified layer on the existing cement concrete pavement of the National Highway No.110 within Tangshan City,this article makes a deep study of construction technology for the layer of graded macadam,with compared to economy analysis.It is considered that paving method of graded macadam between cement concrete pavement and extra-paving layer is a new technology which is feasible in technique and reasonable in economy.

Laying

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