1,721,057 research outputs found
Erratum: Cloaking using anisotropic multilayer circular cylinder (AIP Advances (2020) 10 (095312) DOI: 10.1063/5.0012769)
No full textCo-author Mehwish Nisar should have had an additional affiliation noted in the byline of our original manuscript.1 The correct affiliations for this manuscript are as listed above
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Polarizability of dielectric prolate half ellipse
No full textThis article presents a method for solving the polarizability of a dielectric prolate half ellipse as a function of its relative electric permittivity. The considered geometry consists of two conjoined half ellipses with different permittivities. The polarizability depends on the excitation field direction, therefore can be presented in the form of dyadic consisting of two components that are series and parallel polarizabilities. The method is based on analytical series expansions with coefficients obtained as a numerical solution of a matrix equation
Cloaking and Magnifying using Radial Anisotropy in Non-Integer Dimensional Space
No full textThis paper analyzes the electrostatic responses of polarly radially anisotropic (PRA) cylindrical shell and spherically radially anisotropic (SRA) spherical shell in presence of non-integer dimensional (NID) space. This is obtained by placing both of these geometries in space having non-integer dimensions. The influence of presence of NID space on cloaking and magnification using these geometries have been worked out. Observations have shown that PRA cylindrical shell can only yield cloaking by selecting certain anisotropy ratio in presence of NID space, whereas magnification cannot be achieved. Numerical simulations have been done to show the effectiveness of NID space and for difference of the presence of NID space and ordinary space. However, SRA spherical shell is independent of the presence of NID space for cloaking and magnification
Cloaking using the anisotropic multilayer sphere
No full textWe studied a Spherically Radially Anisotropic (SRA) multilayer sphere with an arbitrary number of layers. Within each layer permittivity components are different from each other in radial and tangential directions. Under the quasi-static approximation, we developed a more generalized mathematical model that can be used to calculate polarizability of the SRA multilayer sphere with any arbitrary number of layers. Moreover, the functionality of the SRA multilayer sphere as a cloak has been investigated. It has been shown that by choosing a suitable contrast between components of the permittivity, the SRA multilayer sphere can achieve threshold required for invisibility cloaking
The polarizability of an alternative sequence of isotropic and radially anisotropic multilayer sphere
No full textIn this article, the polarizability of a multilayer sphere that consists of an alternative sequence of layers of isotropic and spherically radially anisotropic (SRA) material has been investigated. Within each SRA layer, components of the tensor permittivity have different values in radial and tangential directions. The mathematical treatment for extracting electrostatic polarizability has been formulated in terms of scattered potentials. Obtained results have been used to describe the behavior of a whole sphere as a function of number of the isotropic and SRA alternating layers using a numerical approach
Introduction to radar scattering application in remote sensing and diagnostics: Review
No full textThe manuscript reviews the current literature on scattering applications of RADAR (Radio Detecting And Ranging) in remote sensing and diagnostics. This paper gives prime features for a variety of RADAR applications ranging from forest and climate monitoring to weather forecast, sea status, planetary information, and mapping of natural disasters such as the ones caused by earthquakes. Both the fundamental parameters involved in scattering mechanisms of RADAR applications and the factors affecting RADAR performances are also discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Electromagnetic interaction with a monodispersed system in sedimentation equilibrium
No full textIn this paper, a new model to explain the electromagnetic interaction with a monodispersed system in sedimentation equilibrium is presented. Our approach is based on the dispersive system as constituted by a large number of stratification each characterized a constant particle concentration. The interaction between the electromagnetic field and the stratified material is taken into consideration thanks to the T-matrix approach. The concentration of these media varies with continuity along the stratified direction. A host medium constitutes each layer, and it is also assumed to be identical for all layers in which some nano-spherical objects are immersed. Thanks to these hypotheses, the homogenization mixing formula has been taking into account. The reached results show the behavior of the stratified medium as a function of the density for the spherical hosted object and as a function of angular incident direction
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