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Wu, Xinmin,Wang, Huilan Korean Society of Computational and Applied Mathem 2008 Journal of applied mathematics & informatics Vol.26 No.1
By employing the continuation theorem of coincidence degree theory, we derive a sufficient condition for the existence and attractricity of a positive periodic solution for a generalized predator-prey model with diffussion feedback controls.
XinMin Wu,Huilan Wang 한국전산응용수학회 2008 Journal of applied mathematics & informatics Vol.26 No.1
Prey-predator model, diffusion, positive periodic solution, coincidence degree,attractivity By employing the continuation theorem of coincidence degree theory, we derive a sufficient condition for the existence and attractricity of a positive periodic solution for a generalized predator-prey model with diffussion feedback controls.
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.
Decomposition-based multi-objective firefly algorithm for RFID network planning with uncertainty
Zhao, Chuanxin,Wu, Changzhi,Chai, Jian,Wang, Xiangyu,Yang, Xinmin,Lee, Jae-Myung,Kim, Mi Jeong Elsevier 2017 Applied soft computing Vol.55 No.-
<P>Radio frequency identification (RFID) is widely used for item identification and tracking. Due to the limited communication range between readers and tags, how to configure a RFID system in a large area is important but challenging. To configure a RFID system, most existing results are based on cost minimization through using 0/1 identification model. In practice, the system is interfered by environment and probabilistic model would be more reliable. To make sure the quality of the system, more objectives, such as interference and coverage, should be considered in addition to cost. In this paper, we propose a probabilistic-based multi-objective optimization model to address these challenges. The objectives to be optimized include number of readers, interference level and coverage of tags. A decomposition based firefly algorithm is designed to solve this multi-objective optimization problem. Virtual force is integrated into random walk to guide readers moving in order to enhance exploitation. Numerical simulations are introduced to demonstrate and validate our proposed method. Comparing with existing methods, such as Non-dominated Sorting Genetic Algorithm-II and Multi-objective Particle Swarm Optimization approaches, our proposed method can achieve better performance in terms of quality metric and generational distance under the same computational environment. However, the spacing metric of the proposed method is slightly inferior to those compared methods. (C) 2017 Elsevier B.V. All rights reserved.</P>
Tong, Xubo,Zhang, Xinmin,Wu, Luyi,Zhang, Hongzhi,Seo, Hyo Jin Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.748 No.-
<P><B>Abstract</B></P> <P>Ce<SUP>3+</SUP>, Tb<SUP>3+</SUP> co-doped T-phase orthosilicate Ba<SUB>1.2</SUB>Ca<SUB>0.8</SUB>SiO<SUB>4</SUB> phosphors were prepared by means of solid state reactions. The synthesized samples were investigated using XRD and PL emission and excitation spectra. The emission spectra for Ce<SUP>3+</SUP> doped Ba<SUB>1.2</SUB>Ca<SUB>0.8</SUB>SiO<SUB>4</SUB> phosphors show broad bands in the 320–550 nm spectral region. The excitation spectra exhibit several absorption peaks in the range of 250–400 nm. Both the emission and excitation spectra are dependent on the excitation or monitoring wavelengths. We attribute these results to Ce<SUP>3+</SUP> ions occupying two different crystallographic sites (i.e., Ce I and Ce II). The Ce<SUP>3+</SUP>, Tb<SUP>3+</SUP> co-doped Ba<SUB>1.2</SUB>Ca<SUB>0.8</SUB>SiO<SUB>4</SUB> phosphors show Tb<SUP>3+</SUP>-related line emissions in the 475–600 nm spectral region and Ce<SUP>3+</SUP>-related band emissions in the 350–525 nm spectral region when the 4<I>f</I> → 5d transition of Ce<SUP>3+</SUP> is excited (λ<SUB>ex</SUB> = 345 nm), indicating that energy transfer from Ce<SUP>3+</SUP> to Tb<SUP>3+</SUP> takes place. Moreover, the emission intensity of <SUP>5</SUP>D<SUB>4</SUB> → <SUP>7</SUP>F<SUB>5</SUB> transition for Ba<SUB>1.00</SUB>Ce<SUB>0.02</SUB>Tb<SUB>0.08</SUB>Li<SUB>0.10</SUB>Ca<SUB>0.8</SUB>SiO<SUB>4</SUB> is 30 times stronger than that of Ba<SUB>1.04</SUB>Tb<SUB>0.08</SUB>Li<SUB>0.08</SUB>Ca<SUB>0.8</SUB>SiO<SUB>4</SUB> sample under 345-nm UV excitation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PL spectra are dependent on excitation or monitoring wavelengths. </LI> <LI> Ce<SUP>3+</SUP> ions occupy two different crystallographic sites (i.e., Ce I and Ce II). </LI> <LI> Efficient energy transfer from Ce<SUP>3+</SUP> to Tb<SUP>3+</SUP> takes place. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>