Zheng Chen
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View article: An Improved Climbing Strategy for High-Altitude Fast-Deploy Aerostat Systems
An Improved Climbing Strategy for High-Altitude Fast-Deploy Aerostat Systems Open
Due to the restrictions associated with the actual deployment time, the flight performance of traditional aerostat systems in the climbing process needs to be improved to reduce the climbing time and the horizontal movement. This paper pre…
View article: Modal analysis of a crawler chassis of a mobile pole group tower device based on finite element method
Modal analysis of a crawler chassis of a mobile pole group tower device based on finite element method Open
Aiming at the problems of poor stability, large volume, and heavy weight of traditional pole group towers in remote construction areas in China, a mobile automatic lifting and landing double flat arm pole group tower device is designed for…
View article: Insights Into the Evolution Behavior and Hygroscopicity of Black Carbon‐Containing Particles Based on Observations of Their Chemical Compositions in Beijing's Autumn
Insights Into the Evolution Behavior and Hygroscopicity of Black Carbon‐Containing Particles Based on Observations of Their Chemical Compositions in Beijing's Autumn Open
Black carbon‐containing particles (BCc) are key short‐lived climate forcers, exerting strong light absorption that influences climate. Their atmospheric behavior evolves during aging, necessitating chemical characterization to elucidate th…
View article: Approaches and methodologies to enhance the learning outcomes of university front-end development courses: A learning opportunity
Approaches and methodologies to enhance the learning outcomes of university front-end development courses: A learning opportunity Open
The purpose of this study is to explore how to improve the learning effect of university front-end development courses through effective strategies and teaching practices. In recent years, with the rapid development of Internet technology,…
View article: P-N dual-drive scheme enabling silicon photonics modulators operating at 200 GBaud
P-N dual-drive scheme enabling silicon photonics modulators operating at 200 GBaud Open
We present a design concept for the next generation of optical modulators. The demonstrated driver–modulator integrated silicon photonics transmitter can operate at 200 GBaud, while the power efficiency of the driver is 2.5 pJ/bit.
View article: Mechanisms and Production Enhancement Effects of CO2/CH4 Mixed Gas Injection in Shale Oil
Mechanisms and Production Enhancement Effects of CO2/CH4 Mixed Gas Injection in Shale Oil Open
Shale oil, a critical unconventional energy resource, has received substantial attention in recent years. However, systematic research on developing shale oil using mixed gases remains limited, and the effects of various gas compositions o…
View article: Mathematical thermo‐mechanical analysis on flame‐solid interaction: Steady laminar stagnation flow flame stabilized at a plane wall coupled with thermo‐elasticity model
Mathematical thermo‐mechanical analysis on flame‐solid interaction: Steady laminar stagnation flow flame stabilized at a plane wall coupled with thermo‐elasticity model Open
A laminar stagnation flow flame stabilized at a plane wall is theoretically analyzed, coupled with a thermo‐elasticity model in the wall. Mathematical models for both the flame and the wall will be proposed, and corresponding analytical so…
View article: Performance evaluation of highway pavement based on particle swarm optimization
Performance evaluation of highway pavement based on particle swarm optimization Open
In order to improve the scientific and accurate evaluation of expressway pavement performance, we construct a pavement performance evaluation index system based on the measured data from the Jinan section of the Beijing-Shanghai Highway in…
View article: Oxidation Mechanism and Toxicity Evolution of Linalool, a Typical Indoor Volatile Chemical Product
Oxidation Mechanism and Toxicity Evolution of Linalool, a Typical Indoor Volatile Chemical Product Open
Linalool, a high-reactivity volatile chemical product (VCP) commonly found in cleaning products and disinfectants, is increasingly recognized as an emerging contaminant, especially in indoor air. Understanding the gas-phase oxidation mecha…
View article: Analysis of spontaneous ignition of hydrogen-enriched methane in a rectangular tube
Analysis of spontaneous ignition of hydrogen-enriched methane in a rectangular tube Open
This study investigates the spontaneous ignition of high-pressure hydrogen-enriched methane in air within a rectangular tube. A computationally efficient approach has been adopted, utilizing a reduced reaction mechanism and ignition delay …
View article: Effects of micrometer-scale cavities on the shock-to-detonation transition in a heterogeneous LX-17 energetic material
Effects of micrometer-scale cavities on the shock-to-detonation transition in a heterogeneous LX-17 energetic material Open
Cavities and other fracture structures within energetic materials may have significant impact on their performance. The mechanism on how hot spots induced by cavity collapse affect the detonation initiation process is still not fully under…
View article: Research on wind field visualization based on UAV wind measurement method
Research on wind field visualization based on UAV wind measurement method Open
This study introduces an efficient and precise method for gathering atmospheric wind field data in specific regions, utilizing unmanned aerial vehicles (UAVs) equipped with anemometers. We conducted outdoor wind field measurements over com…
View article: POVNav: A Pareto-Optimal Mapless Visual Navigator
POVNav: A Pareto-Optimal Mapless Visual Navigator Open
Mapless navigation has emerged as a promising approach for enabling autonomous robots to navigate in environments where pre-existing maps may be inaccurate, outdated, or unavailable. In this work, we propose an image-based local representa…
View article: A New Smoothing Technique for Bang-Bang Optimal Control Problems
A New Smoothing Technique for Bang-Bang Optimal Control Problems Open
Bang-bang control is ubiquitous for Optimal Control Problems (OCPs) where the constrained control variable appears linearly in the dynamics and cost function. Based on the Pontryagin's Minimum Principle, the indirect method is widely used …
View article: Effect of radiation on laminar flame speed determination in spherically propagating NH3-air, NH3/CH4-air and NH3/H2-air flames at normal temperature and pressure
Effect of radiation on laminar flame speed determination in spherically propagating NH3-air, NH3/CH4-air and NH3/H2-air flames at normal temperature and pressure Open
The use of spherically propagating flames is common for measuring the laminar flame speed in NH3-air, NH3/CH4-air and NH3/H2-air mixtures. However, the radiation-induced uncertainty in such mixtures has not been thoroughly investigated. Du…
View article: Spatial Inhomogeneity of New Particle Formation in the Urban and Mountainous Atmospheres of the North China Plain during the 2022 Winter Olympics
Spatial Inhomogeneity of New Particle Formation in the Urban and Mountainous Atmospheres of the North China Plain during the 2022 Winter Olympics Open
The new particle formation (NPF) process is a significant source of atmospheric secondary particles, which has remarkable impacts on the regional air quality and global radiative forcing. Most NPF studies conduct their measurements at a si…
View article: Spatial-Temporal Pattern of Agricultural Total Factor Productivity Change (Tfpch) in China and Its Implications for Agricultural Sustainable Development
Spatial-Temporal Pattern of Agricultural Total Factor Productivity Change (Tfpch) in China and Its Implications for Agricultural Sustainable Development Open
With increasing tension between humans and land, and arising pressure on food security in China, the improvement of total factor productivity is important to realize agricultural modernization and promote rural revitalization strategy. In …
View article: Effects of Dilution and Pressure on Detonation Propagation Across an Inert Layer
Effects of Dilution and Pressure on Detonation Propagation Across an Inert Layer Open
In explosion accidents, inert layer(s) can be used to dampen or suppress detonation propagation. In detonation engines, the detonation may propagate in an inhomogeneous mixture with inert layer(s). Here, the detonation propagation in hydro…
View article: Comparison of combustion duration and end-gas autoignition in inwardly and outwardly propagating flames induced by different ignition configurations
Comparison of combustion duration and end-gas autoignition in inwardly and outwardly propagating flames induced by different ignition configurations Open
Recently, multiple spark ignition has received great attention since it helps to increase thermal efficiency and to reduce misfire in engines. Multiple spark ignition also affects the combustion duration and thereby it can be used for knoc…
View article: Numerical study on wave configuration of wedge-induced oblique detonation wave: Reactive boundary layer effect
Numerical study on wave configuration of wedge-induced oblique detonation wave: Reactive boundary layer effect Open
A numerical simulation solving the Reynolds-averaged Navier–Stokes equation is presented to investigate the initiation and evolution of the wedge-induced oblique detonation wave (ODW) with emphasis on the effects of the burning boundary la…
View article: Effects of radiation, curvature, and preferential diffusion on the extinction of laminar non-premixed flames
Effects of radiation, curvature, and preferential diffusion on the extinction of laminar non-premixed flames Open
The combined effects of radiative heat loss, curvature, and preferential diffusion on laminar non-premixed flames (or flamelets) are investigated in this work by using asymptotic analysis. A general theoretical description of flame tempera…