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Surface edge element method for 3-D electromagnetic computation 被引量:1
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作者 余海涛 《Journal of Southeast University(English Edition)》 EI CAS 2005年第2期170-174,共5页
A surface edge element method is proposed and implemented in the study ofelectromagnetic scattering fields of general targets. The basis functions for surfaces of arbitraryshape are derived according to the geometrica... A surface edge element method is proposed and implemented in the study ofelectromagnetic scattering fields of general targets. The basis functions for surfaces of arbitraryshape are derived according to the geometrical properties of each triangular patch. The proposedbasis functions are 3-D linear functions and the tangential components of the vectors are continuousas the traditional edge element method. Combined field integral equations (CFIE) that include bothelectrical field and magnetic field integral equations are used to model the electromagneticscattering of general dielectric targets. Special treatment for singularity is presented to enhancethe quality of numerical solutions. The proposed method is used to compute the scattering fieldsfrom various targets. Numerical results obtained by the proposed method are validated by resultsfrom other numerical methods. 展开更多
关键词 surface edge element method method of moment combined field integralequations scattering field
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Sub- and Super-Luminal Phenomena in a Doubly Driven Four-Level System 被引量:2
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作者 韩定安 曾亚光 +4 位作者 陈伟成 董少光 黄纯青 朱传云 梁佩莹 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第4期671-675,共5页
With the occurrence of an adding driving field, the properties of the dispersion and the absorption of a four-level system are changed greatly. The system can produce the normal and anomalous dispersion regions with p... With the occurrence of an adding driving field, the properties of the dispersion and the absorption of a four-level system are changed greatly. The system can produce the normal and anomalous dispersion regions with proper parameters. Here, the driving fields can be seemed as knobs to manipulate the group velocity of a weak probe field between subluminal and superluminal. 展开更多
关键词 group velocity SUBLUMINAL SUPERLUMINAL driving fields
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The Effect of Hydrostatic Pressure Fields on the Dispersion Characteristics of Fluid-shell Coupled System 被引量:5
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作者 刘志忠 李天匀 +1 位作者 朱翔 张俊杰 《Journal of Marine Science and Application》 2010年第2期129-136,共8页
The effect of hydrostatic pressure on the vibration dispersion characteristics of fluid-shell coupled structures was studied.Both fluid-loaded cylindrical shells and fluid-filled cylindrical shells were considered.Num... The effect of hydrostatic pressure on the vibration dispersion characteristics of fluid-shell coupled structures was studied.Both fluid-loaded cylindrical shells and fluid-filled cylindrical shells were considered.Numerical analysis was applied to solve the dispersion equations for shells filled with or loaded with fluid at various hydrostatic pressures.The results for external pressure showed that non-dimensional axial wave numbers are nearly independent when the pressure is below the critical level.The influence of internal pressure on wave numbers was found significant for the real branch s=1 and the complex branches of dispersion curves.The presence of internal pressure increased the cut on frequencies for the branch s=1 for high order wave modes. 展开更多
关键词 hydrostatic pressure DISPERSION fluid-shell coupled system wave propagation
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Effect of weather conditions on the incidence of Lophodermium yellow needle blight in the dwarf mountain pine in the Karkonosze and Izerskie Mountains (Poland)
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作者 Wojciech PUSZ Ryszard WEBER +1 位作者 Andrzej DANCEWICZ Wlodzimierz KITA 《Journal of Mountain Science》 SCIE CSCD 2016年第4期725-733,共9页
The study aimed to determine, by using a statistical model, the effect of weather conditions on the incidence of Lophodermium yellow needle blight causing by new species for science- Lophodermium corconticum, in the m... The study aimed to determine, by using a statistical model, the effect of weather conditions on the incidence of Lophodermium yellow needle blight causing by new species for science- Lophodermium corconticum, in the mountain dwarf pine growing in the subalpine Karkonosze Mountains and the Izerskie Mountains(Poland). Needles showed symptoms of yellow spots, gradual discolouration and premature fall in July. The assessment of healthiness of infected mountain dwarf pine needles spanned three years(2011- 2013) and was conducted in several test sites in the Karkonosze and Izerskie Mountains. The results were analyzed by taking into account the meteorological conditions. Field observations seem to indicate that the highest infestation of mountain dwarf pine occurs in June and July, while September and October see a significantly lower disease index in the Karkonosze Mountains. The lower indices of the infestation of mountain dwarf pine are characteristic for the vegetation in the Hala Izerska high mountain pasture; whereas the environmental conditions prevailing in the Kocio? Ma?ego Stawu cirque and above the Samotnia hostel are conducive to the development of Lophodermium yellow needle blight. 展开更多
关键词 Mountain dwarf pine Fungal diseases Pathogenic fungi Lophodermium corconticum Statistical model
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Manipulation of Persistent Spin Helix States by Weak External Magnetic Fields
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作者 胡茂金 柴政 胡梁宾 《Communications in Theoretical Physics》 SCIE CAS CSCD 2014年第3期385-390,共6页
We study theoretically the effect of weak external magnetic fields on persistent spin helix states in semiconductor two-dimensional electron gases with both Rashba and linear-in-momentum Dresselhaus spin-orbit couplin... We study theoretically the effect of weak external magnetic fields on persistent spin helix states in semiconductor two-dimensional electron gases with both Rashba and linear-in-momentum Dresselhaus spin-orbit coupling.We show that in the presence of weak external magnetic fields, some basic properties of a persistent spin helix state,including the dispersion relation between the decay time and the magnitude of the wavevector, the maximum decay time and the value of the characteristic magnitude of the wavevector at which the maximum decay time occurs, will all depend sensitively on the directions of applied external magnetic fields. 展开更多
关键词 spin-orbit coupling persistent spin helix state effect of weak external magnetic field
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