Lei Chen

Hangzhou Dianzi University

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Fengrui Sun

Beijing University of Chemical Technology

Chuansong Wu

Shandong University

Huiqin Chen

University of Chicago

Chun‐Mei Wu

Chongqing University

Dajie Zhuang

National Institute for Radiological Protection

Y.T. Ge

London South Bank University

Zhipeng Wang

Affiliated Hospital of Jining Medical University

Qian Sun

Chinese Academy of Sciences

J. Li

Naval University of Engineering

J. Wang

Beijing Satellite Navigation Center

Cooperative Institutions

Chinese Academy of Sciences

Zhejiang University

University of Chinese Academy of Sciences

Hangzhou Dianzi University

Naval University of Engineering

Huazhong University of Science and Technology

National Institute for Radiological Protection

Jiangsu University

Xi'an Jiaotong University

Sichuan University

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Optimisation of a model internal combustion engine with linear phenomenological heat transfer law

International Journal of Ambient Energy (2010)

Lei Chen Hanjiang Song Fengrui Sun Chuansong Wu

SYNOPSIS The optimal motion of a model internal combustion engine with a piston fitted inside a cylinder containing an ideal gas is examined. The gas is heated at a given rate f(t) and coupled to a heat bath with linear phenomenological heat transfer law q ∝ Δ(T−1) for a finite amount of time. The optimal motion of the model internal combustion engine with linear phenomenological heat transfer law and maximum power output objective is obtained, as well as the optimal motion of the model internal combustion engine with linear phenomenological heat transfer law, fixed power output and maximum useful work output objective. The maximum useful work output per cycle, the maximum power output and the corresponding efficiency are obtained. Numerical examples are provided and the obtained results are compared with those obtained with Newton's heat transfer law. The results presented herein can provide the basis for both determination of optimal operating conditions and design of real systems operating with linear phenomenological heat transfer law.

Heat Engine

Phenomenological model

Work output

Piston (optics)

Thermal science

10.1080/01430750.2010.9675804

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Citations (8)

Incorporating gesture and gaze into multimodal models of human-to-human communication

Lei Chen

Structural information in language is important for obtaining a better understanding of a human communication (e.g., sentence segmentation, speaker turns, and topic segmentation). Human communication involves a variety of multimodal behaviors that signal both propositional content and structure, e.g., gesture, gaze, and body posture. These non-verbal signals have tight temporal and semantic links to spoken content. In my thesis, I am working on incorporating non-verbal cues into a multimodal model to better predict the structural events to further improve the understanding of human communication. Some research results are summarized in this document and my future research plan is described.

Human communication

10.3115/1225797.1225798

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Citations (4)

Safety verification tests of low and intermediate level radioactive solid waste drum

IOP Conference Series Earth and Environmental Science (2022)

Shutang Sun Zhe Hong Dajie Zhuang Hongchao Sun Yan Feng

Abstract Steel drums or boxes are used to transport, store, and dispose of low- and intermediate-level waste. According to relevant standards, before the solid waste container design is finalized, a series of type tests should be performed, including leakage test, water spray test, stacking test, penetration test, free-drop test, etc. This article focuses on the acceptance test and test methods for the LID- II b type waste drum finalization test. The tests in accordance with the standard requirements are the first time reported in China. It found the inherent design defects, and had high guiding significance to improve design and test verification operation.

Dispose pattern

Penetration test

10.1088/1755-1315/983/1/012112

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Nondestructive Measurement of Al Alloy Surface Strengthening Layer Depth Using Swept Frequency Eddy Current Testing

IOP Conference Series Materials Science and Engineering (2018)

Duxi Liu Cui Chao Weiqing Jin Lei Chen

An innovative nondestructive measurement method of Al alloy surface strengthening layer depth using frequency sweep eddy current testing (SFECT) technology is proposed. Based on the analysis of the forming mechanism of Al alloy surface strengthening layer and the comparison of several possible detection methods, the applicability of SFECT method is discussed theoretically. By means of electromagnetic simulation software Ansoft Maxwell and orthogonal experimental design method, the SFECT coil model is built. The optimal design and simulation of the parameters of the SFECT coil are carried out, and optimal coil structure parameters and lift-off height are obtained. Simulation of depth detection of Al alloy surface strengthened layer using SFECT coil is implemented, and then preliminary experiment of Al alloy surface strengthening layer depth measurement with the self-fabricated SFECT coil is completed. The simulation and experiment results show that SFECT method can be applicable for nondestructive testing of Al alloy surface strengthening layer depth.

Eddy-current sensor

Surface layer

10.1088/1757-899x/392/2/022027

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Citations (2)

Assessing Science Inquiry Skills in an Immersive, Conversation-Based Scenario

Springer eBooks (2016)

Diego Zapata‐Rivera Lei Liu Lei Chen Jiangang Hao Alina A. von Davier

10.1007/978-3-319-06520-5_14

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Citations (12)

A Compact Quad-Band Bandpass Filter Based on Defected Microstrip Structure

Frequenz (2017)

Lei Chen Xiaoyan Li Feng Wei

Abstract A compact quad-band band-pass filter (BPF) based on stub loaded resonators (SLRs) with defected microstrip structure (DMS) is analyzed and designed in this paper. The proposed resonator is created by embedding DMS into the SLR and can achieve four narrow passbands. By employing the pseudointerdigital coupling structure between the two resonators, transmission zeros among each passband are generated to improve the passband selectivity and a high isolation is achieved. In order to validate its practicability, a prototype of a quad-band BPF centred at 1.57, 2.5, 4.3 and 5.2 GHz is designed and fabricated. The proposed filter is more compact due to the slow-wave characteristic of DMS. The simulated and measured results are in good agreement with each other. In addition, the DMS idea can be extended to the design of other microstrip passive devices.

Passband

Stub (electronics)

10.1515/freq-2016-0238

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Citations (9)

Performance and optimization criteria for forward and reverse quantum Stirling cycles

Energy Conversion and Management (1998)

Feng Wu Lei Chen Fengrui Sun Chuansong Wu Yonghong Zhu

Stirling cycle

Heat Engine

Thermodynamic cycle

Quantum thermodynamics

10.1016/s0196-8904(97)10037-1

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Citations (69)

Effect of a complex generalised heat transfer law on the ecological performance of an endoreversible Carnot heat pump

International Journal of Ambient Energy (2009)

Lei Chen J. Li Fengrui Sun Chuansong Wu

SYNOPSIS The effect of a complex generalised heat transfer law q ∝ (ΔTn)m on the ecological performance of an endoreversible Carnot heat pump is derived by taking as the objective function an ecological optimisation criterion representing the best compromise between the exergy output rate and exergy loss rate (entropy production rate) of the heat pump. The results obtained include the optimal ecological performance of an endoreversible heat pump with various heat transfer laws, as obtained in existing literature.

Carnot cycle

Exergy efficiency

Coefficient of performance

10.1080/01430750.2009.9675792

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Citations (20)

Heritability of pre-adolescent brain development: a longitudinal twin study

Behavior Genetics (2010)

I.L.C. van Soelen R.M. Brouwer G. Caroline M. van Baal Hugo G. Schnack Jiska S. Peper

Health psychology

Longitudinal Study

Brain Development

Behavioural genetics

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Ground Reinforcement Method for Closely Spaced Overlapping Tunnels Passing beneath High-Speed Railway Bridge

Journal of Geotechnical and Geoenvironmental Engineering (2022)

Yongshui Kang Zhi Geng Lei Chen Yuanguang Zhu Kejin Li

There is a high risk of ground collapse during the construction of closely spaced overlapping metro tunnels in sensitive environments. When overlapping tunnels pass beneath important structures such as high-speed railway (HSR) bridges whose deformation controlling standard is extremely strict, special ground reinforcement measures should be implemented. This paper investigated stability control measures for closely spaced and overlapping metro tunnels passing beneath the HSR bridge based on the engineering project of the Jinan R1 Metro line in China. The risk sources and engineering difficulties were analyzed. Further, special reinforcement measures including isolation piles and a postgrouting method were proposed. A three-dimensional model was built by a finite element program, and the deformation characteristics of ground and bridge piles were calculated. Subsequently, their deformation characteristics were analyzed and compared with monitoring results. The deformation of an HSR bridge was successfully controlled within permissible value during the shield tunneling process, indicating the effect of ground reinforcement measures is satisfactory.

Bridge (graph theory)

10.1061/(asce)gt.1943-5606.0002923

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Citations (8)