A new type of cloak is discussed: one that gives all cloaked objects the appearance of a flat conducting sheet. It has the advantage that none of the parameters of the cloak is singular and can in fact be made isotropic. It makes broadband cloaking in the optical frequencies one step closer.
标签： appearance discussed cloaked objects
上传时间： 2017-03-30
上传用户：rishian
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
This application can make a comparative analysis of two images using different methods: Logical Operators and singular value decomposition (SVD). In conclusion, with this work we have tried to collect a few methods for differentiating textures.
标签： application comparative different analysis
上传时间： 2017-07-16
上传用户：虫虫虫虫虫虫
singular value decomposition filter for speckle reduction in adaptive ultrasound imagingHasegawa_2019_Jpn._J._Appl._Phys._58_SGGE06
标签： decomposition ultrasound reduction singular adaptive speckle imaging filter value for
上传时间： 2020-06-04
上传用户：mengdeming
