Materials with negative permittivity and permeability can overcome the diffraction limit, thereby making sub-wavelength imaging possible. In this study, we analyze effects of gradient index on a half-infinite perfect lens. We assume that sharp interface between vacuum negative-index material is replaced by smooth transition profile such gradually changing from positive to negative. Interestingly, find if graded modeled tanh function, have closed-form analytical solutions for problem, which...

Hydrogen sulfide (H₂S) is a novel gas transmitter signaling molecule. H₂S synthesized by cystathionine β-synthase (CBS), γ-lyase (CSE), and 3-mercaptopyruvate sulfurtransferase (MST). There have been no reports about the roles of these enzymes in osteosarcoma its metastases. We detected synthase expression levels human primary lung metastatic osteosarcoma.Immunohistochemistry was performed (n=19), (n=11), osteoblastoma (n=10) bony callus (n=2). The CBS, CSE, MST defined as negative,...

An isotropic impedance sheet model is proposed for a loop-type hexagonal periodic metasurface. Both frequency and wave-vector dispersion are considered near the resonance frequency. Therefore both angle polarization dependences of metasurface can be properly simultaneously described in our model. The constitutive relation this transformed into auxiliary differential equations which integrated finite-difference time-domain algorithm. Finally, finite large sample under oblique illumination...

Perturbation theory, if applicable, can provide significant acceleration for parameter optimization. In this work, perturbation theory is developed in scattering problems under the framework of methods moments. Perturbative expansion series are obtained which convenient to calculate by an iterative algorithm. The tested surface impedance coated dielectric radomes. This especially useful derivative-dependent optimization methods.

We study the influences of graded index on Pendry's perfect lens. A lens, in its idealized case, is a slab material with both electric permittivity ε and magnetic permeability μ being -1. In graded-index lens discussed here ε, as well μ, gradually changes from -1 main body to +1 vacuum. During this process changing, will inevitably touch zero value, which introduces singularities corresponding wave equations. analytically discuss imaging properties by use confluent hypergeometric Kummer...

We obtain analytical solutions for positive-to-negative transition materials with a smooth profile "$\tanh$". The fields are expressed in terms of hypergeometric functions. final expressions reflection and transmission coefficients obtained closed forms. total absorption is nonzero even the lossless limit accordance previous studies. Properties as function controlling factors also well studied. As an application results, we analyze effects on perfect imaging and, interestingly, find multiple...

It is well known that negative refraction (NR) can be achieved in left-handed materials. Recently, it suggested NR also realized certain active right-handed However, no experimental realization of has been yet. In this paper, further theoretical constraints on the material parameters are obtained, a possible based Bose-Einstein condensation (BEC) proposed, and detecting method to verify suggested. The feasibility proposal demonstrated. Our conclusion new type probably BEC.

By doing time-domain simulations, we find the proposal for negative-to-positive index switching proposed in [Physical Review Letters, 106 105503 (2012)] may be fragile. The negative opinion on uniform of local optical constants our recent paper [arXiv:1111.1476v2] based circuit model metamaterials can therefore verified this specific and realistic case.

It is a complicated problem to accurately analyze the scattering properties of large surfaces (e.g. radomes) composed periodic metasurfaces. Many approaches have been suggested and applied treat this problem. This study focuses on homogenization approach , namely, treating metasurfaces as homogenized impedance sheets which are wave-vector polarization dependent. These dependences uniformly described by high-order boundary condition. To demonstrate usefulness approach, model numerically...

In the field of antenna measurements, spherical nearfield scanning technique has been well established after years development. This involves near-to-far transformation algorithm. The fast development 5G wireless communication techniques with more applications massive wide-band antennas, demands efficient measurement systems. Therefore, speed deserves much attention than before. paper introduces GPU-acceleration to algorithm and develops highly vectorized Matlab codes. It can accurately...

Objective: To investigate the correlation between joint function and histologic grading after total knee arthroplasty, to aid in early diagnosis prognostication of arthrofibrosis. Methods: A 29 patients including 22 females 7 males were enrolled retrospectively from October 2015 2020. These had a mean age 63 years (range 41 79 years) underwent revision Jishuitan Hospital due contraction or loss range motion. Histologic assessment was carried out by utilizing immunohistochemistry (IHC) Masson...