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Shuwen Zhang,Dejun Tan 한국전산응용수학회 2011 Journal of applied mathematics & informatics Vol.29 No.5
In this paper, we consider two-species periodic Gilpin-Ayala competition system with delay and impulsive effect. By using some analysis methods, suffcient conditions for the permanence of the system are derived. Further, we give the conditions of the existence and global asymptotic stable of positive periodic solution
Shuwen Zhang,Tejun Tan 한국전산응용수학회 2009 Journal of applied mathematics & informatics Vol.27 No.5
In this paper, three species stage-structured predator-preymodel with time delayed and periodic constant impulsive perturbations of predator at fixed times is proposed and investigated. We show that the conditions for the global attractivity of prey(pest)-extinction periodic solution and permanence of the system. Our model exhibits a new modelling method which is applied to investigate impulsive delay differential equations. Our results give some reasonable suggestions for pest management. In this paper, three species stage-structured predator-preymodel with time delayed and periodic constant impulsive perturbations of predator at fixed times is proposed and investigated. We show that the conditions for the global attractivity of prey(pest)-extinction periodic solution and permanence of the system. Our model exhibits a new modelling method which is applied to investigate impulsive delay differential equations. Our results give some reasonable suggestions for pest management.
Zhang, Shuwen,Tan, Dejun The Korean Society for Computational and Applied M 2009 Journal of applied mathematics & informatics Vol.27 No.5
In this paper, three species stage-structured predator-prey model with time delayed and periodic constant impulsive perturbations of predator at fixed times is proposed and investigated. We show that the conditions for the global attractivity of prey(pest)-extinction periodic solution and permanence of the system. Our model exhibits a new modelling method which is applied to investigate impulsive delay differential equations. Our results give some reasonable suggestions for pest management.
Zhang, Shuwen,Tan, Dejun The Korean Society for Computational and Applied M 2011 Journal of applied mathematics & informatics Vol.29 No.5
In this paper, we consider two-species periodic Gilpin-Ayala competition system with delay and impulsive effect. By using some analysis methods, sufficient conditions for the permanence of the system are derived. Further, we give the conditions of the existence and global asymptotic stable of positive periodic solution.
Hui Yu,Shuwen Tan,Hua Li,Ying Jin 한국유전학회 2016 Genes & Genomics Vol.38 No.2
The metallothionein 2 (mt2) genomic gene with 667 bp was cloned from the grass carp (Ctenopharyngodon idellus). The structure of mt2 gene was similar with the reported vertebrae mt gene, containing three exons interrupted by two introns. Only one MRE mortify was found in the 50 flanking region at proximal cluster which was quite different from the previous reports. The number of deduced amino acid was 60, characterized by cysteine-rich. The basal levels and the transcriptional responses of mt2 gene in different organs to cadmium (Cd) were measured using the quantitative real-time PCR (qRT-PCR). In the kidney, the constructive level of the mt2 mRNA was the highest, while the lowest expression level was detected in the skin. The induced impacts of Cd on mt2 mRNA expression were various from tissues. In the liver, gill and skin, the gene was quickly induced at 6 h. After a transient suppression, the expression levels of mt2 mRNA were increased in the intestine and spleen at 12 h, and mt2 mRNA expressed upwards in the bone at 24 h. In the kidney and bone, the expressions elevated only after 48 h Cd induction. The inducibility of mt2 gene to Cd demonstrated that it played a significant role during the metal toxicant detoxification in grass carp and the mt2 gene in the liver was most sensitive to Cd induction.
Enhanced and broadband absorber with surface pattern design for X-Band
Chenguang Wu,Shuwen Chen,Xisheng Gu,Renchao Hu,Shuomin Zhong,Guoguo Tan,Qikui Man,Chuntao Chang,Xinmin Wang,Run-Wei Li 한국물리학회 2018 Current Applied Physics Vol.18 No.1
A broadband and thin-layer microwave absorber is designed based on surface pattern design made by carbonyl iron and rubber composite. The bandwidth with reflection less than 10 dB covers the full Xband owing to two absorption peaks appeared simultaneously in both the simulation results and experimental results. In this work, the power loss and power flow diagram were present by CST simulation, which clearly explain the broadband absorption caused by double l/4 matching absorption and interfacial scattering synergistic effect. A facile splicing method was provided to extend the absorption bandwidth for the magnetic absorbing materials.
Fractal kinetic characteristics of uranium leaching from low permeability uranium-bearing sandstone
Sheng Zeng,Yuan Shen,Bing Sun,Kaixuan Tan,Shuwen Zhang,Wenhao Ye 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.4
The pore structure of uranium-bearing sandstone is one of the critical factors that affect the uraniumleaching performance. In this article, uranium-bearing sandstone from the Yili Basin, Xinjiang, China, wastaken as the research object. The fractal characteristics of the pore structure of the uranium-bearingsandstone were studied using mercury intrusion experiments and fractal theory, and the fractaldimension of the uranium-bearing sandstone was calculated. In addition, the effect of the fractal characteristics of the pore structure of the uranium-bearing sandstone on the uranium leaching kinetics wasstudied. Then, the kinetics was analyzed using a shrinking nuclear model, and it was determined that therate of uranium leaching is mainly controlled by the diffusion reaction, and the dissolution rate constant(K) is linearly related to the pore specific surface fractal dimension (DS) and the pore volume fractaldimension (DV). Eventually, fractal kinetic models for predicting the in-situ leaching kinetics wereestablished using the unreacted shrinking core model, and the linear relationship between the fractaldimension of the sample's pore structure and the dissolution rate during the leaching was fitted.