Based on the traditional scheme for a nonlinear system with multiple time scales, the enveloping slow-fast analysis method is developed in the paper, which can be employed to investigate the dynamics of nonlinear fiel...Based on the traditional scheme for a nonlinear system with multiple time scales, the enveloping slow-fast analysis method is developed in the paper, which can be employed to investigate the dynamics of nonlinear fields with multiple time scales with periodic excitation. Upon using the method, the behaviors of the kinetic model of CO oxidation on the platinum group metals have been explored in detail. Two typicM bursting phenomena such as Fold/Fold/Hopf bursting and Fold/Fold bursting, are presented, the bifurcation mechanisms of which have been obtained. Furthermore, the dynamic difference between the two cases corresponding to relatively large and small perturbation frequencies, respectively, has been presented, which can be used to describe the influence of the frequencies involving in the evolution on the bursting behaviors in the system.展开更多
A broad band polarization-independent reflector working in the telecommunication C＋L band is proposed using the guided mode resonance effect of a periodic surface relief element deposited by a layer of silicon medium...A broad band polarization-independent reflector working in the telecommunication C＋L band is proposed using the guided mode resonance effect of a periodic surface relief element deposited by a layer of silicon medium. It is shown that this structure can provide high reflection （R 〉 99.5%） and wide angular bandwidth （θ≈ 20°, R 〉 98%） for both TE and TM polarizations over a wide spectrum band 1.5 μm-l.6 μm. Furthermore, it is found by rigorous coupled wave analysis that the polarization-independent reflector proposed here is tolerant of a deviation of grating thickness, which makes it very easy to fabricate in experiments.展开更多
In this article, Crank-Nicolson method is used to study the variable order fractional cable equation. The variable order fractional derivatives are described in the Riemann- Liouville and the Griinwald-Letnikov sense....In this article, Crank-Nicolson method is used to study the variable order fractional cable equation. The variable order fractional derivatives are described in the Riemann- Liouville and the Griinwald-Letnikov sense. The stability analysis of the proposed technique is discussed. Numerical results are provided and compared with exact solutions to show the accuracy of the proposed technique.展开更多
The definition of static electricity, the gen-eration mechanism, classification of static electricityon oil product, the accumulation and discharge ofstatic electricity, and the conditions of explosioncaused by electr...The definition of static electricity, the gen-eration mechanism, classification of static electricityon oil product, the accumulation and discharge ofstatic electricity, and the conditions of explosioncaused by electrostatic discharge in oil depot, are in-troduced. The process control measures, such as con-trolling flow rate, improving oil product loading mode,electrostatic grounding and cross connection, using e-lectrostatic conduction coating for inner wall of oiltank, and using electrostaticagement measures, such asent materials, strengtheningeliminator, and the man-avoiding mixing of differ-ventilation, improving oilstatic setting, increasing air humidity, adding antistat-ic agent, and implementing electrostatic protection ofhuman body, are put forward, providing a referencefor the safe operation of oil depot.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 20976075,20976041,and 10972091)
文摘Based on the traditional scheme for a nonlinear system with multiple time scales, the enveloping slow-fast analysis method is developed in the paper, which can be employed to investigate the dynamics of nonlinear fields with multiple time scales with periodic excitation. Upon using the method, the behaviors of the kinetic model of CO oxidation on the platinum group metals have been explored in detail. Two typicM bursting phenomena such as Fold/Fold/Hopf bursting and Fold/Fold bursting, are presented, the bifurcation mechanisms of which have been obtained. Furthermore, the dynamic difference between the two cases corresponding to relatively large and small perturbation frequencies, respectively, has been presented, which can be used to describe the influence of the frequencies involving in the evolution on the bursting behaviors in the system.
基金supported by the Youth Science Research Foundation of China University of Mining and Technology (Grant No. 2009A058)the Fundamental Research Funds for the Central Universities (Grant No. 2010Qnb06)the Natural Science Foundation of Shanghai Committee of Science and Technology (Grant No. 10ZR1433500)
文摘A broad band polarization-independent reflector working in the telecommunication C＋L band is proposed using the guided mode resonance effect of a periodic surface relief element deposited by a layer of silicon medium. It is shown that this structure can provide high reflection （R 〉 99.5%） and wide angular bandwidth （θ≈ 20°, R 〉 98%） for both TE and TM polarizations over a wide spectrum band 1.5 μm-l.6 μm. Furthermore, it is found by rigorous coupled wave analysis that the polarization-independent reflector proposed here is tolerant of a deviation of grating thickness, which makes it very easy to fabricate in experiments.
文摘In this article, Crank-Nicolson method is used to study the variable order fractional cable equation. The variable order fractional derivatives are described in the Riemann- Liouville and the Griinwald-Letnikov sense. The stability analysis of the proposed technique is discussed. Numerical results are provided and compared with exact solutions to show the accuracy of the proposed technique.
文摘The definition of static electricity, the gen-eration mechanism, classification of static electricityon oil product, the accumulation and discharge ofstatic electricity, and the conditions of explosioncaused by electrostatic discharge in oil depot, are in-troduced. The process control measures, such as con-trolling flow rate, improving oil product loading mode,electrostatic grounding and cross connection, using e-lectrostatic conduction coating for inner wall of oiltank, and using electrostaticagement measures, such asent materials, strengtheningeliminator, and the man-avoiding mixing of differ-ventilation, improving oilstatic setting, increasing air humidity, adding antistat-ic agent, and implementing electrostatic protection ofhuman body, are put forward, providing a referencefor the safe operation of oil depot.
