Chao Wang

Beijing University of Technology

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Ru‐Zhi Wang

Beijing University of Technology

Jianzhong Xiao

Huazhong University of Science and Technology

Shengjun Zhang

Jingdezhen Ceramic Institute

Bin Yang

Huazhong University of Science and Technology

Jinlong Xu

Mianyang Central Hospital

Changhao Wang

Beijing University of Technology

Yuting Wu

Jingdezhen Ceramic Institute

Bingrong Wang

Hainan University

Feng Xia

Southwest Jiaotong University

Yongxin Zhu

Shanghai Advanced Research Institute

Cooperative Institutions

Chinese Academy of Sciences

Beijing University of Technology

Institute of Electrical and Electronics Engineers

Antea Group (France)

Huazhong University of Science and Technology

Xi'an Jiaotong University

University of Chinese Academy of Sciences

American Health Network

Canadian Standards Association

Dalian University of Technology

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Broadband spectrally selective infrared radiation and its applications of a superstructure film of combined circular patches

Journal of Applied Physics (2023)

Ze-Lin An Li Liu Li-Ying Liu Chao Wang Lihong Ai

Selective infrared radiation is crucial for achieving infrared stealth and heat dissipation. Artificially designed superstructure film (SF) provides several advantages for controlling and modulating infrared radiation, making them a promising solution for these applications. The research described in this work has successfully produced broadband selective infrared radiation by using a surface made up of circular patches that are combined. Numerical simulations show that this SF can achieve broadband selective radiation with 3–5 μm mid-wave infrared (MWIR) suppression and 8–14 μm long-wave infrared (LWIR) emission. The spectral selectivity can be easily switched to high emissivity in MWIR and low emissivity in LWIR by simply changing the basal layer. The resonance mechanism for achieving broadband spectral selectivity in the SF may be due to a combination of multimode plasmon resonances that are induced by the structural nonrotational symmetry of the circular patches. By applying the selective radiation SF on the tail nozzle or the vehicle, the effect of thermal management is very significant. Selective radiation SF can reduce radiant energy in the 3−5 μm band by a significant amount at 500 °C, resulting in a 46 °C cooler temperature than that at the body without the SF. At 80 °C, radiated energy in the 8–14 μm band is also considerably reduced and the temperature is 10 °C lower than that of the body without the SF. There will be obvious advantages in potential applications for infrared stealth and heat dissipation by the designed SF, a simple and convenient manufacturing process.

Selective surface

Thermal Radiation

Radiation properties

Radiant energy

Low emissivity

10.1063/5.0152953

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Electron Structure Effects of S-Doped In2o3 Nanoflowers on No2 Sensitivity

Yue-Jie Bai Liying Liu Xun-Kai Duan Guang-Xuan Zhang Chao Wang

To further develop sensing materials for NO2 gas detection practical application, the operating temperature of the sensor should be significantly reduced. In this paper, In2O3 nanoflowers were prepared by the microwave-assisted hydrothermal method. Then, In2O3 was doped using thioacetamide. The prepared S-doped In2O3 nanoflowers have good gas sensitivity and significantly reduced operating temperature. When exposed to 10 ppm NO2 gas, the corresponding response was 250 at 118 Â°C. It can be demonstrated by the first principle calculations, in which the doping of S atoms changes the electron structure of In2O3 from semiconductor to metal with a lower potential barrier. Then, significantly affects the electron crossing the intergranular potential barriers. Therefore, the operating temperature of the sensor can be reduced. Our research results will provide new research ideas and technical approaches for designing, fabricating, and applying a new generation of In2O3 gas sensors.

10.2139/ssrn.4332461

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Research on Robot Trajectory Planning Strategy for Water Polo Confrontation

Journal of Physics Conference Series (2021)

Chao Wang Yuefan Xu Hongyang Li

Abstract In the multi-joint robot water polo competition, it often occurs that the robot fish glances off the ball when pushing it due to the water waves generated by the fish swimming and the influence of the opponent fish’s attack behavior on the target ball. In order to improve the success rate of the robot fish hitting the ball, this paper proposes a long-distance posture adjustment strategy and double-fish alternative attack strategy. The long-distance posture adjustment strategy is based on the detailed division of the relative positions of the fish, the ball and the goal. The probability of the fish, the ball and the goal being in a three-point line is improved by setting the distance through which the fish body reaches the preset hitting point and the posture adjustment strategy. Besides, the double-fish alternative attack strategy is proposed on the basis of this ball-pushing strategy. The cooperation between the two fishes is strengthened by developing another fish’s returning strategy during the opponent fish hitting the ball, thereby improving the attack efficiency. The experimental results show that the underwater robot fish can avoid the close touch-ball and can attack the ball into the goal more quickly and accurately.

Ball (mathematics)

10.1088/1742-6596/1732/1/012021

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Including Quantum Effects in Electromagnetic System--An FDTD Solution to Maxwell-Schr�dinger Equations

IEEE MTT-S International Microwave Symposium digest (2007)

Wenquan Sui Jing Yang XiaoHua Yun Chao Wang

In this paper a novel approach to include quantum effects, described by Schrodinger equation in tempo and spatial domains, into electromagnetic system analysis, which uses an extended finite-difference time-domain (FDTD) technique to solve the Maxwell's equations. An iterative numerical scheme that marches in time provides a complete solution that describes the interactions between electromagnetic field and electron movement under quantum effects. An example is given to include electron tunneling current through a potential barrier and the good agreement between the extended FDTD method and the analytical solution proves its accuracy. This technique is expected to become an important tool analyzing nanoscale circuit.

Scattering-matrix method

10.1109/mwsym.2007.380200

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Citations (12)

Characteristics of the mixed convection heat transfer of molten salts in horizontal square tubes

Solar Energy (2017)

Xia Chen Chao Wang Yuting Wu Bin Liu Chongfang Ma

Heat transfer enhancement

Forced convection

10.1016/j.solener.2017.03.031

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Citations (14)

Numerical simulation of mixed convection heat transfer of molten salt in horizontal square tube with single surface heating

Applied Thermal Engineering (2016)

Xia Chen Chao Wang Yuting Wu Cong Chen Chongfang Ma

Heat transfer enhancement

10.1016/j.applthermaleng.2016.05.054

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Citations (23)

Social images tag ranking based on visual words in compressed domain

Neurocomputing (2014)

Jing Zhang Xin Liu Zhuo Li Chao Wang

10.1016/j.neucom.2014.11.027

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Citations (12)

Trajectory Planning Strategy for Robotic Water Polo Matches

IOP Conference Series Materials Science and Engineering (2018)

Chao Wang Yanyan Huo Xiaojun Xiong

An area partition-based ball-pushing control strategy is proposed for the real robot water polo events since the multi-joint robot fishes often play the edge ball or are unable to touch the ball in their attempt of pushing the ball. As a first step, the venue image acquired is partitioned into several areas for separate implementation of different control options regarding the position judgment of ball and fishes and the ball-pushing strategy. According to the line connecting the ball to the goal midpoint, the area around the ball is divided into the ball-pushing area and the non-ball-pushing area, and a temporary point is designed for the ball-pushing area. The robot fishes are set to hit the ball when they are in the ball-pushing area; and when they are in the non-ball-pushing area, the fishes are driven into the ball-pushing area via the temporary point to hit the ball. The experimental results show that the use of this method allows the robot fishes in the water to push the target ball to the goal more quickly and accurately. Aside from the 2V2 water polo competition, the proposed method is also applicable to the N V N water polo competition, and even robot path planning.

Ball (mathematics)

10.1088/1757-899x/466/1/012108

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Citations (3)

Optimizing the binding of the *OOH intermediate via axially coordinated Co-N5 motif for efficient electrocatalytic H2O2 production

Applied Catalysis B Environment and Energy (2023)

Lina Yan Chao Wang Yueshuai Wang Yahui Wang Zhaozhao Wang

Peroxide

10.1016/j.apcatb.2023.123078

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Citations (33)

Experimental Study of the Circulation Air Volume of Recirculation Evaporative Cooling

Jun Xiong Zehua Liu Chao Wang Guojie Chen

This paper introduces the technology of re-circulation evaporative cooling (REC), which uses a portion of supply air as secondary air to make cool water used to indirectly cool outside air through a heat exchanger. The circulation volume of secondary air is one of the main factors that have an impact on the ef- fectiveness of REC. According to the technology, a set of apparatus was set up. The cooling effect was tested under different circulation volumes of secondary air in summer. The test results show that the cooling effec- tiveness rapidly increases and then levels off with the increase of the ratio of circulation volume. We con- clude that there is a proper range of the circulation volume. Keyword: Re-circulation evaporative cooling ; effectiveness ; Experimental study; Circulation air volume; Evaporative cooling

Circulation (fluid dynamics)

Evaporative cooler

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