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SECOND ORDER GENERALIZED DIFFERENCE METHODS OR ONE DIMENSIONAL PARABOLIC EQUATIONS
Jiang, Ziwen,Sun, Jian 한국전산응용수학회 1999 Journal of applied mathematics & informatics Vol.6 No.1
In this paper the second order semi-discrete and full dis-crete generalized difference schemes for one dimensional parabolic equa-tions are constructed and the optimal order $H^1$ , $L^2$ error estimates and superconvergence results in TEX>$H^1$</TEX> are obtained. The results in this paper perfect the theory of generalized difference methods.
Ke, Shaoyong,Sun, Tingting,Zhang, Zhigang,Zhang, Ya-Ni,Liang, Ying,Wang, Kaimei,Yang, Ziwen Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.8
Twenty spirodiclofen analogues have been designed and conveniently synthesized via three steps including esterification, one-pot heterocyclization, and acylation reactions. The target molecules have been identified on the basis of analytical spectra ($^1H$ NMR, $^{13}C$ NMR and ESI-MS) data. All newly synthesized compounds have been screened for their potential insecticidal and herbicidal activity by standard method. The preliminary assays indicated that some of analogues displayed moderate to good insecticidal activity against Plutella xylostella compared with spirodiclofen, and some compounds showed obvious activity against Brassica chinensis. Structure-activity relationship (SAR) is also discussed based on the experimental data.
Seismic Coefficients and Earthquake Damage Predictions for a Space Truss with a Supporting Structure
Zailin Yang,Ziwen Wang,Yang Yong,Menghan Sun 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.4
Previous studies have shown that when the lower support structure is considered, the dynamic characteristics of grid structures change signifi cantly, and the stress distributions are also noticeably diff erent. Therefore, this paper discusses whether other simple and feasible structural seismic damage prediction methods could be proposed after accounting for the infl uence of the lower supporting structure. Considering diff erent site types and diff erent intensities, a time-history analysis was conducted using the mode decomposition response spectrum method for frequent 8- and 9-degree earthquake intensity. Then, the acceleration response spectra for diff erent sites experiencing 8- and 9-degree intensity of frequently occurring earthquakes specifi ed in the Code for Seismic Design of Buildings (GB50011-2010) were used to calculate and discuss the distribution law for the seismic internal forces of space truss structures. Based on the calculation conclusion, the design method and damage prediction method for a plate-like space truss structure under earthquake actions are discussed. Then, a new value of the seismic action coeffi cient was proposed in this paper, and the ground motion peaks for various types of earthquake damage for diff erent site types were obtained using the functional relationship.
Yanfei Qin,Ziwen Sun 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.7
By fully taking the effects of data injection attacks and nonlinear disturbances into consideration, based on dynamic asynchronous event-triggered approach, an observer asynchronous event-triggered robust H∞ adaptive switching method is proposed for the stability of ICPSs. On the one hand, an adaptive feedback controller is designed to resist the negative influence of data injection attacks in systems. On the other hand, a Luenberger state observer is designed to reconstruct a reliable estimate of the whole system state. Finally, the advantage of the presented approach is illustrated by some simulation results.
Shaoyong Ke,Tingting Sun,Zhigang Zhang,Ya-Ni Zhang,Ying Liang,Kaimei Wang,Ziwen Yang 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.8
Twenty spirodiclofen analogues have been designed and conveniently synthesized via three steps including esterification,one-pot heterocyclization, and acylation reactions. The target molecules have been identified on the basis of analytical spectra (1H NMR, 13C NMR and ESI-MS) data. All newly synthesized compounds have been screened for their potential insecticidal and herbicidal activity by standard method. The preliminary assays indicated that some of analogues displayed moderate to good insecticidal activity against Plutella xylostella compared with spirodiclofen,and some compounds showed obvious activity against Brassica chinensis. Structure-activity relationship (SAR) is also discussed based on the experimental data.