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Zhiqiang He,Jinrong Liu,Jianbin Zhang,Na Zhang 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.3
Poly-Ethylene Glycol (PEG) 300+H2O solutions (PEGWs) has been used as a promising medium for theabsorption of SO2. We investigated the UV, FTIR, 1H-NMR, and fluorescence spectra in the absorption processes ofSO2 in PEGWs to present an important absorption mechanism. Based on the spectral results, the possibility of intermolecularhydrogen bond formation by hydroxyl oxygen atom in the PEG molecule with hydrogen atom in H2O andS…O interaction formation by the oxygen atoms in PEG with the sulfur atom in SO2 are discussed. This shows thatthe spectral changes may be due to the formation of -CH2CH2O(H)…HOH… and -CH2-CH2-O(CH2-CH2-)…HOH…in PEGWs and the formation of -CH2CH2OH…OSO…, and intermolecular S…O interaction between PEG and SO2as the formation of -CH2CH2OCH2CH2O(H)…(O)S(O)… and -CH2-CH2-O(CH2-CH2-)…(O)S(O)…. The existenceof these bonds benefits the absorption and desorption processes of SO2 in PEGWs.
Guoai He,Cunxiao He,Yu Liu,Chao Liu,Zhiqiang Fu,Shuanghui Xu,Xiaofei Sheng,Zhu Xiao,Qinghong Wen 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
Dynamic softening behavior has been of great concern in the aluminum alloys, which served a vital role in affecting themicrostructure, deformation resistance and the final mechanical properties. In this paper, spray deposition was applied tomanufacture AlZnMgCu alloy to refine the casting microstructure and reduce segregation. The microstructure responses andcorresponding mechanism during the thermal compression with various temperatures and various strain rates were multiscalecharacterized and uncovered using high-resolution EBSD. The results revealed that many broken and fine grains wereobserved in the uneven and jagged grain boundaries under the low temperatures and high strain rates, which indicated theoccurrence of partial discontinuous dynamic recrystallization (DDRX). In addition, high density dislocations were formedat original grain boundaries, where great amount of low angle grain boundaries (LAGBs) were appeared. With temperatureincreased and strains rate decreased, the LAGBs would evolve to the high angle grain boundaries (HAGBs) owing to theconsiderable dislocations migrated to the grain boundaries then accumulated, which triggered the occurrence of continuousdynamic recrystallization (CDRX). Two different dynamic recrystallization types were observed and factors that influenceddifferent dynamic recrystallization behaviors were clearly elaborated, and the corresponding mechanism was indicateddetailly.
Xu Zhiqiang,He Jialiang,Liu Tong,Li Haidong 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.1
In the context of triple play Ominimedia is not just the simple combination of various media, but the aggregation of all media with different features, communication power and influences,and the interaction and mutual fusion among media of different forms and functions. This paper, based on the development trend of triple play, focused on the theme of Ominimedia, studied the traditional media development strategies to Ominimedia and analyzed in detail the strategies of cloud, tube, end and content aggregation. At the same time it explored the strategies for Ominimedia core competitive strength improvement from multiple dimensions of 3D media, communication channel, AirSharing and brand operation with the expectation of offering references to Ominimedia globalization in the context of triple play.
Observer-based Finite-time Model Reference Adaptive State Tracking Control with Actuator Saturation
Zhiqiang Wang,Dakuo He,Qiang Zhang,Jiahui Shi 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.11
In this paper, the problem of finite-time model reference adaptive state tracking control and the weighted H∞ performance are studied with state unmeasured and actuator saturation. Compared with the existing literature, the state directly measurable problem is relaxed through a state observer. A model reference based adaptive controller is designed to address the state tracking error. Considering the disdifferentiability of the state for the considered system when the controller is saturated, an auxiliary design function is proposed to solve this problem. By utilizing Lyapunov stability theorem, finite-time tracking error bounded and the finite-time weighted H∞ performance are investigated. Moreover, the conservatism of the considered system is investigated by defining the different saturation rates. Finally, examples are provided as a means of illustrating the effective design method.
Modeling Mutual Intraceability of Mobile RFID Systems Using BRS-based Approach
He Jialiang,Ding Jifeng,Xu Xiaoke,Xu Zhiqiang 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.2
Intraceability is the most important aspect of RFID security. Mobile RFID readers are used more and more widely, the privacy of mobile reader privacy holders should be considered. In this paper, a BRS-based approach for modeling mutual intraceability of mobile RFID systems is provided. Elements in a RFID protocol can be represented as bigraphs, communications between elements can be represented as reaction rules. RFID intraceability can be represented as behavioral congruence. We take a RFID air interface protocol for mobile RFID systems as a case study and show the usability of this approach.