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Stability Analysis of High-order Proportional Delayed Cellular Neural Networks with D Operators
Xiaojin Guo,Chuangxia Huang,Zhichun Yang,Jiping Zhang,Jinde Cao 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.2
In this paper, we focus on a class of high-order proportional delayed cellular neural networks involving D operator. First of all, the existence on the positive equilibrium points of the addressed system is revealed by applying the Brouwer’s fixed point theorem. Secondly, by utilizing the differential inequality techniques, Lyapunov function method and the matrix spectral radius theory, the global exponential stability of the positive equilibrium point is established for the first time, which shows that all solutions of the addressed system are eventually positive. Finally, the validity and practicability of our results are illustrated by some numerical simulations. The obtained results extend and improve some existing ones.
Improved dyes separation performance of reduced graphene by incorporation MoS2 nanosheets
Xiaojin Wei,Xiaotao Fan,Yimeng Deng,Liqiang Li,Xiaolong Han,Ping Lu,Chao Huang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
The hydrothermal reduced graphene (rGO) and the layered MoS2 nanosheets prepared by the liquidphasestripping method were blended, and then the MoS2-rGO composite membranes were preparedon the polyvinylidene fluoride (PVDF) supporting membranes by vacuum filtration method. A varietyof characterization methods such as Fourier transform infrared spectrometer (FT-IR), X-ray photoelectronspectroscopy (XPS) and X-ray diffractometer (XRD) were used to verify the successful introduction ofMoS2 into rGO layers and the changes of interlayer structure of the MoS2-rGO membranes. Finally, theeffect of MoS2 loading on separation performance of the MoS2-rGO composite membrane was investigated. The results show that the separation performance of the membrane with 33.33% of MoS2 loading(MrG3) is the most excellent. The permeability of MrG3 membrane is 118.21 Lm-2h1 bar1, whichis about 4.4 times that of the pristine rGO membrane. Meanwhile, the rejection of the MrG3 membranefor Methyl blue, Crystal violet, Rhodamine B, and Congo red all exceed 80%.
Parameter identifi ability of Boolean networks with application to fault diagnosis of nuclear plants
Zhe Dong,Yifei Pan,Xiaojin Huang 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.4
Fault diagnosis depends critically on the selection of sensors monitoring crucial process variables. Boolean network (BN) is composed of nodes and directed edges, where the node state is quantized to theBoolean values of True or False and is determined by the logical functions of the network parameters andthe states of other nodes with edges directed to this node. Since BN can describe the fault propagation ina sensor network, it can be applied to propose sensor selection strategy for fault diagnosis. In this article,a sufficient condition for parameter identifiability of BN is first proposed, based on which the sufficientcondition for fault identifiability of a sensor network is given. Then, the fault identifiability conditioninduces a sensor selection strategy for sensor selection. Finally, the theoretical result is applied to thefault diagnosiseoriented sensor selection for a nuclear heating reactor plant, and both the numericalcomputation and simulation results verify the feasibility of the newly built BN-based sensor selectionstrategy.
Zhiyuan Gao,Jiaqi Huang,Zhonghua Miao,Xiaojin Zhu 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.25 No.5
Vibration at the tip of various flexible manipulators may affect their operation accuracy and work efficiency. To suppress such vibrations, the feasibility of using MFC actuators and sensors is investigated in this paper. Considering the convergence of the famous filtered-x least mean square (FXLMS) algorithm could not be guaranteed while it is employed for vibration suppression of plants with varying secondary path, this paper proposes a new multiple model switching adaptive control algorithm to implement the real time active vibration suppression tests with a new multiple switching strategy. The new switching strategy is based on a cost function with reconstructed error signal and disturbance signal instead of the error signal from the error sensor. And from a robustness perspective, a new variable step-size sign algorithm (VSSA) based FXLMS algorithm is proposed to improve the convergence rate. A cantilever beam with varying tip mass is employed as flexible manipulator model. MFC layers are attached on both sides of it as sensors and actuators. A co-simulation platform was built using ADAMS and MATLAB to test the feasibility of the proposed algorithms. And an experimental platform was constructed to verify the effectiveness of MFC actuators and sensors and the real-time vibration control performance. Simulation and experiment results show that the proposed FXLMS algorithm based multiple model adaptive control approach has good convergence performance under varying load conditions for the flexible cantilever beam, and the proposed FX-VSSA-LMS algorithm based multiple model adaptive control algorithm has the best vibration suppression performance.
Wenjing Xu,Zhanggen Huang,Qianqian Guo,Yaqin Hou,Xiaojin Han 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5
The SO2 oxidation over V2O5/AC catalyst was studied using an in situ diffuse reflectance infrared Fouriertransformation spectroscopy technique at 120 oC. Results reveal that the surface oxygen groups could neither act asactive sites for SO2 oxidation nor supply the oxygen needed for VV↔VIV redox cycle. The vanadia species and gasphase oxygen are essential for SO2 oxidation. During SO2 oxidation over V2O5/AC, the surface hydroxyl groups involvein the formation of sulfate species. The role of water vapor in flue gas might be to supplement the hydroxyl groupsconsumed so that the SO2 oxidation could continue.
Qianqian Guo,Wen Jing,Shangzeng Cheng,Zhanggen Huang,Dekui Sun,Yaqin Hou,Xiaojin Han 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.11
To determine the role of sulfur groups formed on activated carbon (AC) in the selective catalytic reduction (SCR) of NO with NH3, coal-based AC was modified by H2SO4 under various conditions and then treated in N2 atmosphere at 400 oC. The resulting carbons were characterized by N2 adsorption, elemental analysis, temperature programmed desorption and X-ray photoelectron spectroscopy, and tested for the SCR of NO with NH3 in the temperature range of 30-250 oC. Results reveal that H2SO4 modification has little effect on the textural properties, but promotes the formation of sulfur and oxygen groups. The sulfur groups incorporated by H2SO4 modification are mainly sulfonic groups and then sulfates. In particular, these sulfur groups play a predominant role in improving NH3 adsorption and then enhancing the SCR activity of modified carbons above 150 oC. However, the contribution of oxygen groups to NO reduction is very limited under the conditions employed in this work.
A Model of Atomization on a Flash Boiling Spray with Fuel Containing Co2
( Xiao Jin ),( Huang Zhen ),( Qiao Xin Qi ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
A model of atomization on a flash boiling spray is presented. The model includes two submodels. One is internal nozzle flow phenomenological model, which is developed to provide the jet mass discharge, initial spray angle and droplet size according to the two phase flow characteristic of fuel containing gas in the nozzle, the other is a new atomization model for a flash boiling spray with fuel containing CO2 on the foundation of spherical bubble dynamics. Good agreement was obtained between the calculation and experiment data..