A mathematical equation for vibration of submerged floating tunnel tether under the effects of earthquake and parametric excitation is presented. Multi-step Galerkin method is used to simplify this equation and the fo...A mathematical equation for vibration of submerged floating tunnel tether under the effects of earthquake and parametric excitation is presented. Multi-step Galerkin method is used to simplify this equation and the fourth-order Runge-Kuta integration method is used for numerical analysis. Finally, vibration response of submerged floating tunnel tether subjected to earthquake and parametric excitation is analyzed in a few numerical examples. The results show that the vibration response of tether varies with the seismic wave type; the steady maximum mid-span displacement of tether subjected to seismic wave keeps constant when parametric resonance takes place; the transient maximum mid-span displacement of tether is related to the peak value of input seismic wave acceleration.展开更多
Previous studies show that exposure to high-voltage electric fields would influence the electro-cardiogram both in experimental animals and human beings.The effects of the external electric fields upon action potentia...Previous studies show that exposure to high-voltage electric fields would influence the electro-cardiogram both in experimental animals and human beings.The effects of the external electric fields upon action potential of cardiac cells are studied in this paper based on the dynamical model,LR91.Fourth-order Runger-Kuta is used to analyze the change of potassium ion channels exposed to external electric fields in detail.Results indicate that external electric fields could influence the current of potassium ion by adding an induced component voltage on membrane.This phenomenon might be one of the reasons of heart rate anomaly under the high-voltage electric fields.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 51108224)the Promotive Research Fund for Excellent Young and Middle-aged Scientists of Shandong Province (Grant No. BS2010HZ005)
文摘A mathematical equation for vibration of submerged floating tunnel tether under the effects of earthquake and parametric excitation is presented. Multi-step Galerkin method is used to simplify this equation and the fourth-order Runge-Kuta integration method is used for numerical analysis. Finally, vibration response of submerged floating tunnel tether subjected to earthquake and parametric excitation is analyzed in a few numerical examples. The results show that the vibration response of tether varies with the seismic wave type; the steady maximum mid-span displacement of tether subjected to seismic wave keeps constant when parametric resonance takes place; the transient maximum mid-span displacement of tether is related to the peak value of input seismic wave acceleration.
基金supported by the National Nature Science Foundation of China under Grant No. 30400105
文摘Previous studies show that exposure to high-voltage electric fields would influence the electro-cardiogram both in experimental animals and human beings.The effects of the external electric fields upon action potential of cardiac cells are studied in this paper based on the dynamical model,LR91.Fourth-order Runger-Kuta is used to analyze the change of potassium ion channels exposed to external electric fields in detail.Results indicate that external electric fields could influence the current of potassium ion by adding an induced component voltage on membrane.This phenomenon might be one of the reasons of heart rate anomaly under the high-voltage electric fields.