We Analyze, both Analytically And numerically, the effectiveness of cloaking An infinite cylinder from observations by electromagnetic waves in three dimensions. We show that, as truncated approximations of the ideal permittivity And permeability tensors tend towards the singular ideal cloaking fields, so that the Anisotropy ratio tends to infinity, the D And B fields blow up near the cloaking surface. Since the metamaterials used to implement cloaking are based on effective medium theory, the resulting large variation in D And B will pose a challenge to the suitability of the field averaged characterization of " And 碌. We also consider cloaking with And without the SHS (softAnd- hard surface) lining, shown in [6] to be theoretically necessary for cloaking in the cylindrical geometry. We demonstrate numerically that cloaking is significAntly improved by the SHS lining, with both the far field of the scattered wave significAntly reduced And the blow up of D And B prevented.
标签： effectiveness Analytically numerically cloaking
上传时间： 2017-03-30
上传用户：zxc23456789
In An electromagnetic cloak based on a trAnsformation approach, reduced sets of material properties are generally favored due to their easier implementation in reality, although a seemingly inevitable drawback of undesired reflection exists in such cloaks. Here we suggest using high-order trAnsformations to create smooth moduli at the outer boundary of the cloak, therefore completely eliminating the detrimental scattering within the limit of geometric optics. We apply this scheme to a non-magnetic cylindrical cloak And demonstrate that the scattered field is reduced substAntially in a cloak with optimal quadratic trAnsformation as compared to its linear counterpart.
标签： electromagnetic trAnsformation properties approach
上传时间： 2017-03-30
上传用户：pkkkkp
An OVERVIEW OF PEAK-TO-AVERAGE POWER RATIO REDUCTION TECHNIQUES FOR MULTICARRIER TRAnSMISSION
标签： PEAK-TO-AVERAGE MULTICARRIER TRAnSMISSION TECHNIQUES
上传时间： 2017-03-31
上传用户：gyq
this doc describe An Effecient Histogram Generation Using Scattering on GPUs
标签： Generation Scattering Effecient Histogram
上传时间： 2014-01-12
上传用户：许小华
this code is An example for kalmAn filter
标签： example filter kalmAn this
上传时间： 2017-04-01
上传用户：wqxstar
An Introduction to Neural Networks
标签： Introduction Networks Neural An
上传时间： 2013-12-21
上传用户：AbuGe
The double-density DWT is An improvement upon the critically sampled DWT with importAnt additional properties: (1) It employs one scaling function And two distinct wavelets, which are designed to be offset from one Another by one half, (2) The double-density DWT is overcomplete by a factor of two, And (3) It is nearly shift-invariAnt. In two dimensions, this trAnsform outperforms the stAndard DWT in terms of denoising however, there is room for improvement because not all of the wavelets are directional. That is, although the double-density DWT utilizes more wavelets, some lack a dominAnt spatial orientation, which prevents them from being able to isolate those directions.
标签： double-density improvement additional critically
上传时间： 2017-04-03
上传用户：dongbaobao
LDATRACE Calculates An LDA trAnsform to maximize trace discriminAnt
标签： discriminAnt Calculates trAnsform LDATRACE
上传时间： 2013-12-17
上传用户：tyler
this m file is describe Similarity matrix for An image
标签： Similarity describe matrix image
上传时间： 2014-01-21
上传用户：黄华强
it An software like windows excel written in c
标签： software windows written excel
上传时间： 2013-12-13
上传用户：xuAn‘niAn
