Adaptive Event-triggered Cooperative Tracking Control Under Full-state Constraints Based on Nonlinear Time-varying Multi-agent Systems

Lingfang Sun,Yida Zang,Xiuyu Zhang,Guoqiang Zhu,Cheng Zhong,Chenliang Wang 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.3

An adaptive dynamic surface control (DSC) scheme using event triggering mechanism and barrier Lyapunov function (BLF) to constraint state variables and solve energy saving issues is proposed for multi-agent systems (MASs). Furthermore, invented a control algorithm that uses the event-triggered mechanism for not only decrease the number of information exchanges between agents significantly but also decreased utilization of electricityand communication expenses in the control process. DSC and full-state constraints are used to solve the “complexityexplosion” problem of the traditional back-stepping method. Simulation and semi-physical experimental platformswere constructed to verify the proposed algorithm is valid.

Hazard prediction of coal and gas outburst based on fisher discriminant analysis

Chen, Liang,Wang, Enyuan,Feng, Junjun,Wang, Xiaoran,Li, Xuelong Techno-Press 2017 Geomechanics & engineering Vol.13 No.5

Coal and gas outburst is a serious dynamic disaster that occurs during coal mining and threatens the lives of coal miners. Currently, coal and gas outburst is commonly predicted using single indicator and its critical value. However, single indicator is unable to fully reflect all of the factors impacting outburst risk and has poor prediction accuracy. Therefore, a more accurate prediction method is necessary. In this work, we first analyzed on-site impacting factors and precursors of coal and gas outburst; then, we constructed a Fisher discriminant analysis (FDA) index system using the gas adsorption index of drilling cutting ${\Delta}h_2$, the drilling cutting weight S, the initial velocity of gas emission from borehole q, the thickness of soft coal h, and the maximum ratio of post-blasting gas emission peak to pre-blasting gas emission $B_{max}$; finally, we studied an FDA-based multiple indicators discriminant model of coal and gas outburst, and applied the discriminant model to predict coal and gas outburst. The results showed that the discriminant model has 100% prediction accuracy, even when some conventional indexes are lower than the warning criteria. The FDA method has a broad application prospects in coal and gas outburst prediction.

Enhanced Performance of Solution‐Processed TESPE‐ADT Thin‐Film Transistors

Chen, Liang‐,Hsiang,Hu, Tarng‐,Shiang,Huang, Peng‐,Yi,Kim, Choongik,Yang, Ching‐,Hao,Wang, Juin‐,Jie,Yan, Jing‐,Yi,Ho, Jia‐,Chong,Lee, Cheng‐,Chung,Chen WILEY‐VCH Verlag 2013 Chemphyschem Vol.14 No.12

<P><B>Abstract</B></P><P>A solution‐processed anthradithiophene derivative, 5,11‐bis(4‐triethylsilylphenylethynyl)anthradithiophene (TESPE‐ADT), is studied for use as the semiconducting material in thin‐film transistors (TFTs). To enhance the electrical performance of the devices, two different kinds of solution processing (spin‐coating and drop‐casting) on various gate dielectrics as well as additional post‐treatment are employed on thin films of TESPE‐ADT, and <I>p</I>‐channel OTFT transport with hole mobilities as high as ∼0.12 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> are achieved. The film morphologies and formed microstructures of the semiconductor films are characterized in terms of film processing conditions and are correlated with variations in device performance.</P>

SIMULATING TIRE INFLATION PRESSURE LOSS RATE TEST BY THE IDEAL MATERIAL METHOD

Chen Liang,Xinyu Zhu,Changda Li,Guolin Wang,Liu Ji 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.4

Tire Inflation Pressure Loss Rate (IPLR) test is a widely accepted test method to evaluate the tire pressure retention performance, which helps increase fuel economy and prevent premature tire failures. At present, an IPLR test usually lasts for several months, which greatly reduces the efficiency of relevant research. Several analytical models are available to estimate the IPLR value, however, it mainly considers the gauge and permeability of innerliner, ignoring the effect of other components and detailed tire structure. In order to perform a thorough study of tire pressure loss process, a finite element model was developed with the material input of both mechanical and permeability properties of various rubber compounds and tire geometry input. A creative method, ideal material method, was proposed to describe the transient pressure loss process. Through this solution, a finite element model of Passenger Car Radial tire is established to predict IPLR, with a difference from the experimental result less than 5 %. Based on the model, air diffusion path in the tire is studied to better understand the process, which explains the bubble location in tire immersion tests. The effect of innerliner parameters, including halobutyl content, gauge and ending length of innerliner, on IPLR has been investigated based on simulation models.

Dual-template synthesis of interconnected 3D hollow N-doped carbon network for electrochemical application

Chen Liang,Yang Lanyun,Xu Chenxi,Chen Kechun,Wang Wei,Yang Liming,Hou Zhaohui 한국탄소학회 2023 Carbon Letters Vol.33 No.2

Recently, hollow carbon spheres (HCS) have aroused great interests in the field of energy storage and conversion owing to their unique morphology, structure and other charming properties. Nevertheless, unsatisfactory electrical conductivity and relatively poor volumetric energy density caused by inevitable gaps between discrete carbon spheres greatly impede the practical application of HCS. In this work, for the first time we propose a novel dual-template strategy and successfully fabricate interconnected 3D hollow N-doped carbon network (HNCN) by a facile and scalable pyrolysis process. By systematical characterization and analysis, it can be found that HNCN is assembled by HCS and lots of mesoporous carbon. Compared to the counterparts, the obtained HNCN exhibits unique 3D interconnected architecture, larger specific surface area, hierarchical meso/macropore structure, higher structure defects, higher N doping amount and more optimized N configurations (especially for pyridinic-N and graphitic-N). As a result, these advantageous features endow HNCN with remarkably promoted electrochemical performance for supercapacitor and oxygen reduction reaction. Clearly, our proposed dual-template strategy provides a good guidance on overcoming the intrinsic shortcomings of HCS, which undoubtedly broadens their application in energy storage and conversion.

Mesenchymal stem cell-derived extracellular vesicles protect against abdominal aortic aneurysm formation by inhibiting NET-induced ferroptosis

Chen Liang,Liu Yuting,Wang Zheyu,Zhang Leiyang,Xu Yi,Li Yinan,Zhang Lan,Wang Guiming,Yang Shuofei,Xue Guanhua 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-

Neutrophil extracellular traps (NETs) play an important role in abdominal aortic aneurysm (AAA) formation; however, the underlying molecular mechanisms remain unclear. Mesenchymal stem cell-derived extracellular vesicles (MSC-EVs) may exert therapeutic effects on AAA through their immunomodulatory and regenerative abilities. This study aimed to examine the role and mechanism of MSC-EVs in regulating the development of NET-mediated AAA. Excessive release of NETs was observed in patients with AAA, and the levels of NET components were associated with the clinical outcomes of the patients. Datasets from the Gene Expression Omnibus database were analyzed and revealed that the PI3K/AKT pathway and ferroptosis were strongly associated with NETosis during AAA formation. Further experiments verified that NETs promoted AAA formation by inducing ferroptosis in smooth muscle cells (SMCs) by inhibiting the PI3K/AKT pathway. The PI3K agonist 740 Y-P, the ferroptosis inhibitor ferrostatin-1, and Padi4 deficiency significantly prevented AAA formation. MSC-EVs attenuated AAA formation by reducing NET release in an angiotensin II-induced AAA mouse model. In vitro experiments revealed that MSC-EVs reduced the release of NETs by shifting NETosis to apoptosis. Our study indicates an important role for NET-induced SMC ferroptosis in AAA formation and provides several potential targets for AAA treatment

Numerical simulation on gas continuous emission from face during roadway excavation

Chen, Liang,Wang, Enyuan,Feng, Junjun,Li, Xuelong,Kong, Xiangguo,Zhang, Zhibo Techno-Press 2016 Geomechanics & engineering Vol.10 No.3

With the mining depth continuously increasing, gas emission behaviors become more and more complex. Gas emission is an important basis for choosing the method of gas drainage, gas controlling. Thus, the accurate prediction of gas emission is of great significance for coal mine. In this work, based on the sources of gas emission from the heading faces and the fluid-solid coupling process, we established a gas continuous dynamic emission model, numerically simulated and applied it to the engineering. The result was roughly consistent with the actual situation and shows the model is correct. We proposed the measures of reducing the excavation distance and borehole gas drainage based on the model. The measures were applied and the result shows the overproof problem of gas emission disappears. The model considered the influence factors of gas emission wholly, and has a wide applicability, promotional value. The research is of great significance for the controlling of gas disaster, gas drainage and pre-warning coal and gas outbursts based on gas emission anomaly at the heading face.