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We derive the guidance conditions of a slab waveguide of uniaxially anisotropic dispersive material with not all of the components in the permittivity and permeability tensor the same sign. Taking the lossless dispersive left-handed media model for example, in terms of the operating angular frequency omegao of the metamaterial, the even mode properties for guided TE waves are discussed in three classes...
Summary We performed this study in order to assess the clinical potential of 13N-ammonia PET in patients with cerebral astrocytoma. Methods Dynamic 13N-ammonia PET was performed in 25 patients with suspected cerebral gliomas or recurrent cerebral astrocytomas (19 male and 6 female patients; age range 18–64 years) detected by MRI. The histopathological diagnoses were made for all cases either...
In this paper, a method that combines the microwave network theory with MoM-FDTD algorithm to calculate the isolation between antennas involving dielectric objects is presented. First, a novel iteration procedure of a hybrid method combining the method of moments with the finite-difference time-domain method is employed to simulate the antennas with dielectric objects. Then, the network theory is...
In EMC study, the interaction of two-antenna system is usually described with isolation between antennas. In this paper, the authors point out the definition of traditional isolation between antennas is unreasonable and it will give incorrect isolation prediction. We put forward definitions of arbitrary isolation, ideal isolation and practical isolation of antennas according to three states of antenna...
Though interactive direct volume rendering produces meaningful images with high quality, it cannot display separate inner ear labyrinth or cochlea only by adjusting imaging parameters to suppress the surrounding structures. Novel semi-automatic segmentation methods were presented to extract the cochlea and inner ear from spiral CT images. The cochlea was separated from the medical image volume by...
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